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1

Real time Faraday spectrometer  

DOEpatents

This invention uses a dipole magnet to bend the path of a charged particle beam. As the deflected particles exit the magnet, they are spatially dispersed in the bend-plane of the magnet according to their respective momenta and pass to a plurality of chambers having Faraday probes positioned therein. Both the current and energy distribution of the particles is then determined by the non-intersecting Faraday probes located along the chambers. The Faraday probes are magnetically isolated from each other by thin metal walls of the chambers, effectively providing real time current-versus-energy particle measurements.

Smith, Jr., Tommy E. (Fremont, CA); Struve, Kenneth W. (Albuquerque, NM); Colella, Nicholas J. (Livermore, CA)

1991-01-01

2

Real time Faraday spectrometer  

Microsoft Academic Search

This invention uses a dipole magnet to bend the path of a charged particle beam. As the deflected particles exit the magnet, they are spatially dispersed in the bend-plane of the magnet according to their respective momenta and pass to a plurality of chambers having Faraday probes positioned therein. Both the current and energy distribution of the particles is then

Smith Jr. Tommy E; Kenneth W. Struve; Nicholas J. Colella

1991-01-01

3

Real time Faraday spectrometer  

Microsoft Academic Search

This patent describes an invention which uses a dipole magnet to bend the path of a charged particle beam. As the deflected particles exit the magnet, they are spatially dispersed in the bend-plane of the magnet according to their respective momenta and pass to a plurality of chambers having Faraday probes positioned therein. Both the current and energy distribution of

T. E. Smith; K. W. Struve; N. J. Colella

1991-01-01

4

Real-time imaging  

Microsoft Academic Search

Real-time imaging systems are a special class that underlies important application domains that include industrial, medical and military. The main characteristic of a real-time imaging system is the need for deadline satisfaction. Admittedly, this definition is very broad and vague. The case can be made that every system is real-time. In a \\

P. A. Laplante

2005-01-01

5

Kerr and Faraday microscope for space- and time-resolved studies  

NASA Astrophysics Data System (ADS)

We present a multi-purpose scanning magneto-optical microscope for the investigation of magnetic thin films. The setup can be used for both static and time-resolved (pump-probe) measurements. It is moreover compatible with samples with arbitrary magnetic anisotropy, as it allows Kerr measurements in polar and longitudinal geometry as well as in transmission (Faraday geometry). We demonstrate that the microscope can be used in the following modi: (i) static imaging mode (in polar Kerr and Faraday geometry) with a spatial resolution of 1.7 ?m; (ii) time-resolved mode (polar Kerr geometry) with a temporal resolution of 300 femtoseconds.

Schmitt, Oliver; Steil, Daniel; Alebrand, Sabine; Ganss, Fabian; Hehn, Michel; Mangin, Stéphane; Albrecht, Manfred; Mathias, Stefan; Cinchetti, Mirko; Aeschlimann, Martin

2014-09-01

6

Real-Time Simulation  

NASA Technical Reports Server (NTRS)

Coryphaeus Software, founded in 1989 by former NASA electronic engineer Steve Lakowske, creates real-time 3D software. Designer's Workbench, the company flagship product, is a modeling and simulation tool for the development of both static and dynamic 3D databases. Other products soon followed. Activation, specifically designed for game developers, allows developers to play and test the 3D games before they commit to a target platform. Game publishers can shorten development time and prove the "playability" of the title, maximizing their chances of introducing a smash hit. Another product, EasyT, lets users create massive, realistic representation of Earth terrains that can be viewed and traversed in real time. Finally, EasyScene software control the actions among interactive objects within a virtual world. Coryphaeus products are used on Silican Graphics workstation and supercomputers to simulate real-world performance in synthetic environments. Customers include aerospace, aviation, architectural and engineering firms, game developers, and the entertainment industry.

1997-01-01

7

Real-Time Application Interface  

Microsoft Academic Search

Real-Time Application Interface (RTAI) is a real-time Linux implementation based on RTLinux. It adds a small real-time kernel below the standard Linux kernel and treats the Linux kernel as a low priority real-time task. RTAI provides a large selection of inter-process communication mechanisms and other real-time services. Additionally, RTAI provides a LXRT module for easy developement of real-time applications in

Pasi Sarolahti

8

J. CHEM. SOC. FARADAY TRANS., 1994, 90(21), 3315-3322 3315 Time-resolved Microwave Conductivity  

E-print Network

J. CHEM. SOC. FARADAY TRANS., 1994, 90(21), 3315-3322 3315 Time-resolved Microwave Conductivity and Michael R. Hoffmann" W. M.Keck Laboratories, California lnsiituie of Technology, Pasadena, CA 91125,USA

Adolphs, Ralph

9

A discussion of `Faraday cage’ lightning protection and application to real building structures  

Microsoft Academic Search

Lightning protection has been practised for almost 250 years but we still lack an exact expression of the protective effect produced by the air termination. In this paper, protection primarily refers to the `Faraday cage’ (meshwork) type of external protection. The interior of a completely enclosed metal shell is free from the effects of any external changes of electric field

M Szczerbi?ski

2000-01-01

10

Phase effects due to previous pulses in time-resolved Faraday rotation measurements  

NASA Astrophysics Data System (ADS)

Time-resolved Faraday rotation measurements have proved transformative in the investigation of spin dynamics in semiconductors. In materials with spin lifetimes which are on the order of, or greater than, the laser repetition time, the collective effect of spin polarization due to the whole pump pulse train becomes important. Here, we discuss a relative phase shift which results from these spins. We derive and experimentally validate a closed-form expression which describes this phase shift and characterize it throughout parameter space. A spin lifetime measurement based on this phase shift is described, and we discuss situations in which the model used must be augmented to be applicable.

Trowbridge, Christopher J.; Sih, Vanessa

2015-02-01

11

Connecting Real-Time and Non-Real-Time Components  

Microsoft Academic Search

In this paper we describe a solution to the problem of communication between real-time and non-real-time compo- nents in a split container architecture. The split architecture carries forward an experience we gained in the The Dresden Real-Time Operating System Project (DROPS) (8): Often, only small parts of applications need to be real-time capable. Furthermore, often these parts require only a

Martin Pohlack; Ronald Aigner; Hermann Härtig

12

Real time automated inspection  

DOEpatents

A method and apparatus relating to the real time automatic detection and classification of characteristic type surface imperfections occurring on the surfaces of material of interest such as moving hot metal slabs produced by a continuous steel caster. A data camera transversely scans continuous lines of such a surface to sense light intensities of scanned pixels and generates corresponding voltage values. The voltage values are converted to corresponding digital values to form a digital image of the surface which is subsequently processed to form an edge-enhanced image having scan lines characterized by intervals corresponding to the edges of the image. The edge-enhanced image is thresholded to segment out the edges and objects formed by the edges are segmented out by interval matching and bin tracking. Features of the objects are derived and such features are utilized to classify the objects into characteristic type surface imperfections.

Fant, Karl M. (Minneapolis, MN); Fundakowski, Richard A. (Saint Paul, MN); Levitt, Tod S. (Minneapolis, MN); Overland, John E. (Plymouth, MN); Suresh, Bindinganavle R. (New Brighton, MN); Ulrich, Franz W. (Minneapolis, MN)

1985-01-01

13

Real time automated inspection  

DOEpatents

A method and apparatus are described relating to the real time automatic detection and classification of characteristic type surface imperfections occurring on the surfaces of material of interest such as moving hot metal slabs produced by a continuous steel caster. A data camera transversely scans continuous lines of such a surface to sense light intensities of scanned pixels and generates corresponding voltage values. The voltage values are converted to corresponding digital values to form a digital image of the surface which is subsequently processed to form an edge-enhanced image having scan lines characterized by intervals corresponding to the edges of the image. The edge-enhanced image is thresholded to segment out the edges and objects formed by the edges by interval matching and bin tracking. Features of the objects are derived and such features are utilized to classify the objects into characteristic type surface imperfections. 43 figs.

Fant, K.M.; Fundakowski, R.A.; Levitt, T.S.; Overland, J.E.; Suresh, B.R.; Ulrich, F.W.

1985-05-21

14

Real time polarimetric dehazing.  

PubMed

Remote sensing is a rich topic due to its utility in gathering detailed accurate information from locations that are not economically feasible traveling destinations or are physically inaccessible. However, poor visibility over long path lengths is problematic for a variety of reasons. Haze induced by light scatter is one cause for poor visibility and is the focus of this article. Image haze comes about as a result of light scattering off particles and into the imaging path causing a haziness to appear on the image. Image processing using polarimetric information of light scatter can be used to mitigate image haze. An imaging polarimeter which provides the Stokes values in real time combined with a "dehazing" algorithm can automate image haze removal for instant applications. Example uses are to improve visual display providing on-the-spot detection or imbedding in an active control loop to improve viewing and tracking while on a moving platform. In addition, removing haze in this manner allows the trade space for a system operational waveband to be opened up to bands which are object matched and not necessarily restricted by scatter effects. PMID:23518739

Mudge, Jason; Virgen, Miguel

2013-03-20

15

Michael Faraday vs. the Spiritualists  

Microsoft Academic Search

In the 1850s, renowned physicist Michael Faraday launched a public campaign against pseudoscience and spiritualism, which were rampant in England at the time. Faraday objected especially to claims that electrical or magnetic forces were responsible for paranormal phenomena, such as table-spinning and communication with the dead. Using scientific methods, Faraday unmasked the deceptions of spiritualists, clairvoyants and mediums and also

Alan Hirshfeld

2006-01-01

16

REAL TIME LINUX MEETS LABVIEW  

Microsoft Academic Search

This contribution describes a possibility to build critical real-time applications using RT Linux 2.3 and LabVIEW 5.1 for Linux. Therefore a software interface has been added to LabVIEW, which gives control over real-time processes running on RT Linux. Unlike LabVIEW-RTtm, the real-time processes are programmed as linux kernel modules using \\

Thomas Leibner

17

Real Time Streaming Protocol (RTSP)  

Microsoft Academic Search

The Real Time Streaming Protocol, or RTSP, is an application-level protocol for control over the delivery of data with real-time properties. RTSP provides an extensible framework to enable controlled, on-demand delivery of real-time data, such as audio and video. Sources of data can include both live data feeds and stored clips. This protocol is intended to control multiple data delivery

H. Schulzrinne; A. Rao; R. Lanphier

1998-01-01

18

Real-time flutter identification  

NASA Technical Reports Server (NTRS)

The techniques and a FORTRAN 77 MOdal Parameter IDentification (MOPID) computer program developed for identification of the frequencies and damping ratios of multiple flutter modes in real time are documented. Physically meaningful model parameterization was combined with state of the art recursive identification techniques and applied to the problem of real time flutter mode monitoring. The performance of the algorithm in terms of convergence speed and parameter estimation error is demonstrated for several simulated data cases, and the results of actual flight data analysis from two different vehicles are presented. It is indicated that the algorithm is capable of real time monitoring of aircraft flutter characteristics with a high degree of reliability.

Roy, R.; Walker, R.

1985-01-01

19

Real-time software receiver  

NASA Technical Reports Server (NTRS)

A real-time software receiver that executes on a general purpose processor. The software receiver includes data acquisition and correlator modules that perform, in place of hardware correlation, baseband mixing and PRN code correlation using bit-wise parallelism.

Ledvina, Brent M. (Inventor); Psiaki, Mark L. (Inventor); Powell, Steven P. (Inventor); Kintner, Jr., Paul M. (Inventor)

2007-01-01

20

Real-time software receiver  

NASA Technical Reports Server (NTRS)

A real-time software receiver that executes on a general purpose processor. The software receiver includes data acquisition and correlator modules that perform, in place of hardware correlation, baseband mixing and PRN code correlation using bit-wise parallelism.

Ledvina, Brent M. (Inventor); Psiaki, Mark L. (Inventor); Powell, Steven P. (Inventor); Kintner, Jr., Paul M. (Inventor)

2006-01-01

21

Real Time Data System (RTDS)  

NASA Technical Reports Server (NTRS)

Lessons learned from operational real time expert systems are examined. The basic system architecture is discussed. An expert system is any software that performs tasks to a standard that would normally require a human expert. An expert system implies knowledge contained in data rather than code. And an expert system implies the use of heuristics as well as algorithms. The 15 top lessons learned by the operation of a real time data system are presented.

Muratore, John F.

1991-01-01

22

Real-time results without real-time systems  

Microsoft Academic Search

The data acquisition system at the National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, East Lansing, is based on commodity PC components running an unmodified Linux kernel. A commercial PCI-VME bus bridge connects the readout processors of this system to digitization hardware. While Linux is not a real-time system, this paper shows how we have structured the readout software to

Ron Fox; Eric Kasten; Kanayo Orji; Chase Bolen; Christopher Maurice; Jason Venema

2004-01-01

23

Using Time Variable Faraday Rotation Measures to Probe the Narrow Line Region in Quasars  

Microsoft Academic Search

Using the VLBA we have obtained high resolution (submilliarcsecond) Faraday Rotation Measure (RM) images of the quasars 3C273 and 3C279. Our 2000 January 27 observation was made by combining observations at 8, 12, 15, 22, and 43 GHz. We see variations in the RM of these quasars on short spatial (<10 pc) and temporal (3 year) scales. The most striking

R. T. Zavala; G. B. Taylor

2000-01-01

24

Validating Real Time Specifications using Real Time Event Queue Modeling  

Microsoft Academic Search

Interrupt-driven real time control software is difficult to design and validate. It does not line up well with traditional state-based, timed-transition specification formalisms, due to the complexity of timers and the pending interrupt queue. The present work takes a new approach to the problem of modeling and tool-supported reasoning about such systems based on infinite-state modeling of the temporal event

Robert J. Hall

2008-01-01

25

Michael Faraday vs. the Spiritualists  

NASA Astrophysics Data System (ADS)

In the 1850s, renowned physicist Michael Faraday launched a public campaign against pseudoscience and spiritualism, which were rampant in England at the time. Faraday objected especially to claims that electrical or magnetic forces were responsible for paranormal phenomena, such as table-spinning and communication with the dead. Using scientific methods, Faraday unmasked the deceptions of spiritualists, clairvoyants and mediums and also laid bare the credulity of a public ill-educated in science. Despite his efforts, Victorian society's fascination with the paranormal swelled. Faraday's debacle anticipates current controversies about public science education and the interface between science and religion. This episode is one of many described in the new biography, The Electric Life of Michael Faraday (Walker & Co.), which chronicles Faraday's discoveries and his unlikely rise from poverty to the pinnacle of the English science establishment.

Hirshfeld, Alan

2006-12-01

26

Real Time Forecasting with EPANET  

Microsoft Academic Search

Automa tic on -line simulation provides the system operator with the capability to model the water distribution system in real -time, including predictive estimation of the system behavior. This is essential when performing emergency response and can greatly assist in confirming normal system performance, system trouble -shooting, improvement of system operations, and projection of the current operating scenario. This approach

P. Ingeduld

2007-01-01

27

Quantitative Real-Time PCR  

Microsoft Academic Search

Unlike classical end-point analysis PCR, real-time PCR provides the data required for quantification of the target nucleic acid. The results can be expressed in absolute terms by reference to external quantified standards or in relative terms compared to another target sequence present within the sample. Absolute quantification requires that the efficiency of the amplification reaction is the same in all

N. A. Saunders

28

Real Time Sonic Boom Display  

NASA Technical Reports Server (NTRS)

This presentation will provide general information about sonic boom mitigation technology to the public in order to supply information to potential partners and licensees. The technology is a combination of flight data, atmospheric data and terrain information implemented into a control room real time display for flight planning. This research is currently being performed and as such, any results and conclusions are ongoing.

Haering, Ed

2014-01-01

29

Clinical virology in real time  

Microsoft Academic Search

The ability to detect nucleic acids has had and still has a major impact on diagnostics in clinical virology. Both quantitative and qualitative techniques, whether signal or target amplification based systems, are currently used routinely in most if not all virology laboratories. Technological improvements, from automated sample isolation to real time amplification technology, have given the ability to develop and

Hubert G. M Niesters

2002-01-01

30

Real-time cytotoxicity assays.  

PubMed

Validation of new therapeutic targets calls for the advance in innovative assays that probe both spatial and temporal relationships in signaling networks. Cell death assays have already found a widespread use in pharmacological profiling of anticancer drugs. Such assays are, however, predominantly restricted to end point DEAD/LIVE parameter that provides only a snapshot of inherently stochastic process such as tumor cell death. Development of new methods that can offer kinetic real-time analysis would be highly advantageous for the pharmacological screening and predictive toxicology. In the present work we outline innovative protocols for the real-time analysis of tumor cell death, based on propidium iodide (PI) and SYTOX Green probes. These can be readily adapted to both flow cytometry and time-lapse fluorescence imaging. Considering vast time savings and kinetic data acquisition such assays have the potential to be applied in a number of areas including accelerated anticancer drug discovery and high-throughput screening routines. PMID:21516415

Wlodkowic, Donald; Faley, Shannon; Darzynkiewicz, Zbigniew; Cooper, Jonathan M

2011-01-01

31

Interactive real time flow simulations  

NASA Technical Reports Server (NTRS)

An interactive real time flow simulation technique is developed for an unsteady channel flow. A finite-volume algorithm in conjunction with a Runge-Kutta time stepping scheme was developed for two-dimensional Euler equations. A global time step was used to accelerate convergence of steady-state calculations. A raster image generation routine was developed for high speed image transmission which allows the user to have direct interaction with the solution development. In addition to theory and results, the hardware and software requirements are discussed.

Sadrehaghighi, I.; Tiwari, S. N.

1990-01-01

32

[Real time 3D echocardiography  

NASA Technical Reports Server (NTRS)

Three-dimensional representation of the heart is an old concern. Usually, 3D reconstruction of the cardiac mass is made by successive acquisition of 2D sections, the spatial localisation and orientation of which require complex guiding systems. More recently, the concept of volumetric acquisition has been introduced. A matricial emitter-receiver probe complex with parallel data processing provides instantaneous of a pyramidal 64 degrees x 64 degrees volume. The image is restituted in real time and is composed of 3 planes (planes B and C) which can be displaced in all spatial directions at any time during acquisition. The flexibility of this system of acquisition allows volume and mass measurement with greater accuracy and reproducibility, limiting inter-observer variability. Free navigation of the planes of investigation allows reconstruction for qualitative and quantitative analysis of valvular heart disease and other pathologies. Although real time 3D echocardiography is ready for clinical usage, some improvements are still necessary to improve its conviviality. Then real time 3D echocardiography could be the essential tool for understanding, diagnosis and management of patients.

Bauer, F.; Shiota, T.; Thomas, J. D.

2001-01-01

33

Real time psychrometric data collection  

SciTech Connect

Eight Mine Weather Stations (MWS) installed at the Waste Isolation Pilot Plant (WIPP) to monitor the underground ventilation system are helping to simulate real-time ventilation scenarios. Seasonal weather extremes can result in variations of Natural Ventilation Pressure (NVP) which can significantly effect the ventilation system. The eight MWS(s) (which previously collected and stored temperature, barometric pressure and relative humidity data for subsequent NVP calculations) were upgraded to provide continuous real-time data to the site wide Central monitoring System. This data can now be utilized by the ventilation engineer to create realtime ventilation simulations and trends which assist in the prediction and mitigation of NVP and psychrometric related events.

McDaniel, K.H.

1996-12-31

34

Faraday's Law  

NSDL National Science Digital Library

Light a light bulb by waving a magnet. This simulation of a Faraday's Law is from the Physics Education Technology website of University of Colorado. It is accessible for teachers and students alike. Included are links to related topics and additional ideas and activities for teachers to use.

35

Real-time flutter analysis  

NASA Technical Reports Server (NTRS)

The important algorithm issues necessary to achieve a real time flutter monitoring system; namely, the guidelines for choosing appropriate model forms, reduction of the parameter convergence transient, handling multiple modes, the effect of over parameterization, and estimate accuracy predictions, both online and for experiment design are addressed. An approach for efficiently computing continuous-time flutter parameter Cramer-Rao estimate error bounds were developed. This enables a convincing comparison of theoretical and simulation results, as well as offline studies in preparation for a flight test. Theoretical predictions, simulation and flight test results from the NASA Drones for Aerodynamic and Structural Test (DAST) Program are compared.

Walker, R.; Gupta, N.

1984-01-01

36

The Real Time Ocean Environment  

NSDL National Science Digital Library

This site from the Naval Research Laboratory Stennis Space Center features a real time look at the world's oceans as remotely sensed from earth orbiting satellites. Data can be accessed for different regions of the earth and include altimetry, temperature and salinity, and derived sea surface products. Each plot has a title at the top indicating three things: the region represented, the altimeter from which the data was obtained, and the type of data plotted. More information about the plots can be found in data sources. Detailed information about the data types can be gained from the other headings in the table of contents of the page.

Kirk Whitmer

37

Real Time Linux - The RTOS for Astronomy?  

Microsoft Academic Search

The BoF was attended by about 30 participants and a free CD of real time Linux-based upon RedHat 5.2-was available. There was a detailed presentation on the nature of real time Linux and the variants for hard real time: New Mexico Tech's RTL and DIAPM's RTAI. Comparison tables between standard Linux and real time Linux responses to time interval generation

P. N. Daly

2000-01-01

38

Real-time analysis keratometer  

NASA Technical Reports Server (NTRS)

A computer assisted keratometer in which a fiducial line pattern reticle illuminated by CW or pulsed laser light is projected on a corneal surface through lenses, a prismoidal beamsplitter quarterwave plate, and objective optics. The reticle surface is curved as a conjugate of an ideal corneal curvature. The fiducial image reflected from the cornea undergoes a polarization shift through the quarterwave plate and beamsplitter whereby the projected and reflected beams are separated and directed orthogonally. The reflected beam fiducial pattern forms a moire pattern with a replica of the first recticle. This moire pattern contains transverse aberration due to differences in curvature between the cornea and the ideal corneal curvature. The moire pattern is analyzed in real time by computer which displays either the CW moire pattern or a pulsed mode analysis of the transverse aberration of the cornea under observation, in real time. With the eye focused on a plurality of fixation points in succession, a survey of the entire corneal topography is made and a contour map or three dimensional plot of the cornea can be made as a computer readout in addition to corneal radius and refractive power analysis.

Adachi, Iwao P. (Inventor); Adachi, Yoshifumi (Inventor); Frazer, Robert E. (Inventor)

1987-01-01

39

Real-time cardiac monitors.  

PubMed

Real-time cardiac monitors (RTCMs) are portable computerized devices that use programmed algorithms to perform rapid, readily available online analysis and processing of electrocardiographic (ECG) data. RTCMs are primarily applied for long-term monitoring of ambulatory cardiac outpatients for the purpose of detecting transient abnormal ECG events. A wide variety of RTCM devices is available ranging from limited capacity intermittent recorders that store only selected ECG data, to 24-hour full-disclosure systems that provide ECG complex and to replay this data for subsequent review. Critics of RTCMs suggest that the best algorithms are imperfect and may lead to errors involving potentially lethal arrhythmias, while proponents argue that real-time cardiac monitoring is sufficiently reliable for clinical use. Available data suggest that the devices are safe and particularly with regard to detecting ventricular arrhythmias, clinically reliable. Currently available algorithms cannot analyze atrial fibrillation, pacemaker rhythms, isolated P-waves, junctional rhythms, and atrial ventricular blocks. The advantages and limitations of RTCMs are well described. Their use can be applied to provide satisfactory results in the diagnosis, prognosis, and therapeutic amangement of selected patients. PMID:2699435

Handelsman, H

1989-01-01

40

Real time analysis under EDS  

SciTech Connect

This paper describes the analysis component of the Enrichment Diagnostic System (EDS) developed for the Atomic Vapor Laser Isotope Separation Program (AVLIS) at Lawrence Livermore National Laboratory (LLNL). Four different types of analysis are performed on data acquired through EDS: (1) absorption spectroscopy on laser-generated spectral lines, (2) mass spectrometer analysis, (3) general purpose waveform analysis, and (4) separation performance calculations. The information produced from this data includes: measures of particle density and velocity, partial pressures of residual gases, and overall measures of isotope enrichment. The analysis component supports a variety of real-time modeling tasks, a means for broadcasting data to other nodes, and a great degree of flexibility for tailoring computations to the exact needs of the process. A particular data base structure and program flow is common to all types of analysis. Key elements of the analysis component are: (1) a fast access data base which can configure all types of analysis, (2) a selected set of analysis routines, (3) a general purpose data manipulation and graphics package for the results of real time analysis. Each of these components are described with an emphasis upon how each contributes to overall system capability. 3 figs.

Schneberk, D.

1985-07-01

41

Autonomous Real Time Requirements Tracing  

NASA Technical Reports Server (NTRS)

One of the more challenging aspects of software development is the ability to verify and validate the functional software requirements dictated by the Software Requirements Specification (SRS) and the Software Detail Design (SDD). Insuring the software has achieved the intended requirements is the responsibility of the Software Quality team and the Software Test team. The utilization of Timeliner-TLX(sup TM) Auto- Procedures for relocating ground operations positions to ISS automated on-board operations has begun the transition that would be required for manned deep space missions with minimal crew requirements. This transition also moves the auto-procedures from the procedure realm into the flight software arena and as such the operational requirements and testing will be more structured and rigorous. The autoprocedures would be required to meet NASA software standards as specified in the Software Safety Standard (NASASTD- 8719), the Software Engineering Requirements (NPR 7150), the Software Assurance Standard (NASA-STD-8739) and also the Human Rating Requirements (NPR-8705). The Autonomous Fluid Transfer System (AFTS) test-bed utilizes the Timeliner-TLX(sup TM) Language for development of autonomous command and control software. The Timeliner-TLX(sup TM) system has the unique feature of providing the current line of the statement in execution during real-time execution of the software. The feature of execution line number internal reporting unlocks the capability of monitoring the execution autonomously by use of a companion Timeliner-TLX(sup TM) sequence as the line number reporting is embedded inside the Timeliner-TLX(sup TM) execution engine. This negates I/O processing of this type data as the line number status of executing sequences is built-in as a function reference. This paper will outline the design and capabilities of the AFTS Autonomous Requirements Tracker, which traces and logs SRS requirements as they are being met during real-time execution of the targeted system. It is envisioned that real time requirements tracing will greatly assist the movement of autoprocedures to flight software enhancing the software assurance of auto-procedures and also their acceptance as reliable commanders.

Plattsmier, George; Stetson, Howard

2014-01-01

42

Autonomous Real Time Requirements Tracing  

NASA Technical Reports Server (NTRS)

One of the more challenging aspects of software development is the ability to verify and validate the functional software requirements dictated by the Software Requirements Specification (SRS) and the Software Detail Design (SDD). Insuring the software has achieved the intended requirements is the responsibility of the Software Quality team and the Software Test team. The utilization of Timeliner-TLX(sup TM) Auto-Procedures for relocating ground operations positions to ISS automated on-board operations has begun the transition that would be required for manned deep space missions with minimal crew requirements. This transition also moves the auto-procedures from the procedure realm into the flight software arena and as such the operational requirements and testing will be more structured and rigorous. The autoprocedures would be required to meet NASA software standards as specified in the Software Safety Standard (NASASTD- 8719), the Software Engineering Requirements (NPR 7150), the Software Assurance Standard (NASA-STD-8739) and also the Human Rating Requirements (NPR-8705). The Autonomous Fluid Transfer System (AFTS) test-bed utilizes the Timeliner-TLX(sup TM) Language for development of autonomous command and control software. The Timeliner- TLX(sup TM) system has the unique feature of providing the current line of the statement in execution during real-time execution of the software. The feature of execution line number internal reporting unlocks the capability of monitoring the execution autonomously by use of a companion Timeliner-TLX(sup TM) sequence as the line number reporting is embedded inside the Timeliner-TLX(sup TM) execution engine. This negates I/O processing of this type data as the line number status of executing sequences is built-in as a function reference. This paper will outline the design and capabilities of the AFTS Autonomous Requirements Tracker, which traces and logs SRS requirements as they are being met during real-time execution of the targeted system. It is envisioned that real time requirements tracing will greatly assist the movement of autoprocedures to flight software enhancing the software assurance of auto-procedures and also their acceptance as reliable commanders

Plattsmier, George I.; Stetson, Howard K.

2014-01-01

43

The Real-Time Specification for Java  

Microsoft Academic Search

New languages, programming disciplines, operating systems, and software engineering techniques sometimes hold considerable potential for real-time software developers. A promising area of interest-but one fairly new to the real-time community-is object-oriented programming. Java, for example, draws heavily from object orientation and is highly suitable for extension to real-time and embedded systems.

G. Bollella Andk. Jeffay; James Gosling

2000-01-01

44

Allocating Non-Real-Time and Soft Real-Time Jobs in Multiclusters  

E-print Network

Allocating Non-Real-Time and Soft Real-Time Jobs in Multiclusters Ligang He, Student Member, IEEE for two types of sequential jobs that might be found in multicluster systems, namely, non-real-time jobs and soft real-time jobs. Two workload allocation strategies, the Optimized mean Response Time (ORT

Jarvis, Stephen

45

Lines of Force: Faraday's and Students' Views.  

ERIC Educational Resources Information Center

Analyzes how electric and magnetic lines of force were conceived by Faraday and how they are understood by a group of Argentine university students after receiving instruction. Results show that many students possess ideas similar to those of Faraday in that lines of force are conceived as real physical entities responsible for the transmission of…

Pocovi, M. Cecilia; Finley, Fred

2002-01-01

46

Real-time scene generator  

NASA Astrophysics Data System (ADS)

This paper describes the techniques which have been developed for an infra-red (IR) target, countermeasure and background image generation system working in real time for HWIL and Trial Proving applications. Operation is in the 3 to 5 and 8 to 14 micron bands. The system may be used to drive a scene projector (otherwise known as a thermal picture synthesizer) or for direct injection into equipment under test. The provision of realistic IR target and countermeasure trajectories and signatures, within representative backgrounds, enables the full performance envelope of a missile system to be evaluated. It also enables an operational weapon system to be proven in a trials environment without compromising safety. The most significant technique developed has been that of line by line synthesis. This minimizes the processing delays to the equivalent of 1.5 frames from input of target and sightline positions to the completion of an output image scan. Using this technique a scene generator has been produced for full closed loop HWIL performance analysis for the development of an air to air missile system. Performance of the synthesis system is as follows: 256 * 256 pixels per frame; 350 target polygons per frame; 100 Hz frame rate; and Gouraud shading, simple reflections, variable geometry targets and atmospheric scaling. A system using a similar technique has also bee used for direct insertion into the video path of a ground to air weapon system in live firing trials. This has provided realistic targets without degrading the closed loop performance. Delay of the modified video signal has been kept to less than 5 lines. The technique has been developed using a combination of 4 high speed Intel i860 RISC processors in parallel with the 4000 series XILINX field programmable gate arrays (FPGA). Start and end conditions for each line of target pixels are prepared and ordered in the I860. The merging with background pixels and output shading and scaling is then carried out in the FPGA's on a line by line basis. The whole process is carried out at 4 * 4 super-sampled rates to minimize spatial aliasing. Other techniques such as real time selective image filtering will be described and a video will be shown to demonstrate the successful application of these in HWIL and Trials proving.

Lord, Eric; Shand, David J.; Cantle, Allan J.

1996-05-01

47

Holin triggering in real time  

PubMed Central

During ? infections, the holin S105 accumulates harmlessly in the membrane until, at an allele-specific time, suddenly triggering to form irregular holes of unprecedented size (>300 nm), releasing the endolysin from the cytoplasm, resulting in lysis within seconds. Here we used a functional S105–GFP chimera and real-time deconvolution fluorescence microscopy to show that the S105–GFP fusion accumulated in a uniformly distributed fashion, until suddenly, within 1 min, it formed aggregates, or rafts, at the time of lethal triggering. Moreover, the isogenic fusion to a nonlethal S105 mutant remained uniformly distributed, whereas a fusion to an early-lysing mutant showed early triggering and early raft formation. Protein accumulation rates of the WT, early, and nonlethal alleles were identical. Fluorescence recovery after photobleaching (FRAP) revealed that the nonlethal mutant and untriggered WT hybrids were highly mobile in the membrane, whereas the WT raft was essentially immobile. Finally, an antiholin allele, S105?TMD1–mcherryfp, in the product of which the S105 sequence deleted for the first transmembrane domain was fused to mCherryFP. This hybrid retained full antiholin activity, in that it blocked lethal hole formation by the S105–GFP fusion, accumulated uniformly throughout the host membrane and prevented the S105–GFP protein from forming rafts. These findings suggest that phage lysis occurs when the holin reaches a critical concentration and nucleates to form rafts, analogous to the initiation of purple membrane formation after the induction of bacteriorhodopsin in halobacteria. This model for holin function may be relevant for processes in mammalian cells, including the release of nonenveloped viruses and apoptosis. PMID:21187415

White, Rebecca; Chiba, Shinobu; Pang, Ting; Dewey, Jill S.; Savva, Christos G.; Holzenburg, Andreas; Pogliano, Kit; Young, Ry

2011-01-01

48

Real-Time Data Display  

NASA Technical Reports Server (NTRS)

RT-Display is a MATLAB-based data acquisition environment designed to use a variety of commercial off-the-shelf (COTS) hardware to digitize analog signals to a standard data format usable by other post-acquisition data analysis tools. This software presents the acquired data in real time using a variety of signal-processing algorithms. The acquired data is stored in a standard Operator Interactive Signal Processing Software (OISPS) data-formatted file. RT-Display is primarily configured to use the Agilent VXI (or equivalent) data acquisition boards used in such systems as MIDDAS (Multi-channel Integrated Dynamic Data Acquisition System). The software is generalized and deployable in almost any testing environment, without limitations or proprietary configuration for a specific test program or project. With the Agilent hardware configured and in place, users can start the program and, in one step, immediately begin digitizing multiple channels of data. Once the acquisition is completed, data is converted into a common binary format that also can be translated to specific formats used by external analysis software, such as OISPS and PC-Signal (product of AI Signal Research Inc.). RT-Display at the time of this reporting was certified on Agilent hardware capable of acquisition up to 196,608 samples per second. Data signals are presented to the user on-screen simultaneously for 16 channels. Each channel can be viewed individually, with a maximum capability of 160 signal channels (depending on hardware configuration). Current signal presentations include: time data, fast Fourier transforms (FFT), and power spectral density plots (PSD). Additional processing algorithms can be easily incorporated into this environment.

Pedings, Marc

2007-01-01

49

Joint Opportunities for RealTime Linux and RealTime Systems Research  

E-print Network

Joint Opportunities for Real­Time Linux and Real­Time Systems Research BjË? orn B. Brandenburg­RT that would enhance Linux's viability as the ``platform of choice'' for real­time­systems research) scheduling support in Linux that integrates hard and soft real­time guarantees as well as best

Anderson, James

50

Joint Opportunities for Real-Time Linux and Real-Time Systems Research  

E-print Network

Joint Opportunities for Real-Time Linux and Real-Time Systems Research Bj¨orn B. Brandenburg-RT that would enhance Linux's viability as the "platform of choice" for real-time-systems research) scheduling support in Linux that integrates hard and soft real-time guarantees as well as best

Anderson, James

51

Dynamic Integrated Scheduling of Hard Real-Time, Soft Real-Time and Non-Real-Time Processes  

Microsoft Academic Search

Real-time systems are growing in complexity and real- time and soft real-time applications are becoming common in general-purpose computing environments. Thus, there is a growing need for scheduling solutions that simultaneously support processes with a variety of different timeliness con- straints. Toward this goal we have developed the Resource Allocation\\/Dispatching (RAD) integrated scheduling model and the Rate-Based Earliest Deadline (RBED)

Scott A. Brandt; Scott A. Banachowski; Caixue Lin; Timothy Bisson

2003-01-01

52

Faraday rotating Brillouin sensor system  

Microsoft Academic Search

A Faraday Rotating Brillouin Sensor System (FRoBS) is described and experimentally verified to reduce abrubt temperature\\/strain change distortions of the Brillouin Spectrum.This single-ended Brillouin System is created by modifying a typical Brillouin Optical Time-Domain Analysis system and adding a Faraday Rotating Mirror (FRM) and a Polarization Beam Splitter (PBS).Both lasers are combined with a PBS and are launched into the

Anthony W. Brown; Michael T. V. Wylie; Bruce G. Colpitts

2011-01-01

53

Research of real time embedded distributed systems  

Microsoft Academic Search

Real time embedded systems have to use relatively simple scheduling models and algorithms because of their constrained resource. In this paper, a kind of real-time distributed system architecture is presented. The system consists of a two-stages scheduling strategy, overload scheduling algorithm based on a multi-priorities, a improved real time scheduling algorithm based on preemption threshold, a priority driving Ethernet protocol

Huang Guang Jun; Petr Musilek

2008-01-01

54

The PROMPT Real-Time Commit Protocol  

Microsoft Academic Search

We investigate the performance implications of providing transaction atomicity for firm-deadline real-time applications operating on distributed data. Using a detailed simulation model, the real-time performance of a representative set of classical transaction commit protocols is evaluated. The experimental results show that data distribution has a significant influence on real-time performance and that the choice of commit protocol clearly affects the

Jayant R. Haritsa; Krithi Ramamritham; Ramesh Gupta

2000-01-01

55

MARTe: A Multiplatform Real-Time Framework  

Microsoft Academic Search

Development of real-time applications is usually associated with nonportable code targeted at specific real-time operating systems. The boundary between hardware drivers, system services, and user code is commonly not well defined, making the development in the target host significantly difficult. The Multithreaded Application Real-Time executor (MARTe) is a framework built over a multiplatform library that allows the execution of the

André C. Neto; Filippo Sartori; Fabio Piccolo; Riccardo Vitelli; Gianmaria De Tommasi; Luca Zabeo; Antonio Barbalace; Horacio Fernandes; Daniel F. Valcárcel; Antonio J. N. Batista

2010-01-01

56

Introduction to Real-Time Databases  

E-print Network

, since early 1980) CC Based on Simulation . Complex CC . CC Based on Application Semantics . CC of Mixed-Time Database Systems: · Hard real-time database systems, e.g., safety-critical system such as an early warning system, etc. · Soft real-time database systems, e.g., banking system, airline reservation system, digital

Ouhyoung, Ming

57

MISR Near Real Time Products Available  

Atmospheric Science Data Center

MISR Near Real Time Products Available Wednesday, September 3, 2014 ... Data Center (ASDC) announce the release of new Near Real Time (NRT) versions of the MISR L1B2 Georectified Radiance Product (GRP) ... interval. The file names will include the unique start time of each session, differentiating them from standard MISR product files. ...

2014-09-04

58

Research in Distributed Real-Time Systems  

NASA Technical Reports Server (NTRS)

This document summarizes the progress we have made on our study of issues concerning the schedulability of real-time systems. Our study has produced several results in the scalability issues of distributed real-time systems. In particular, we have used our techniques to resolve schedulability issues in distributed systems with end-to-end requirements. During the next year (1997-98), we propose to extend the current work to address the modeling and workload characterization issues in distributed real-time systems. In particular, we propose to investigate the effect of different workload models and component models on the design and the subsequent performance of distributed real-time systems.

Mukkamala, R.

1997-01-01

59

The Concise Handbook of Real-Time Systems  

E-print Network

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48 TimeSys Solutions for Real-Time System Developers . . . . . . .49 TimeSys LinuxTM ; A Real-Time OSThe Concise Handbook of Real-Time Systems version 1.3 #12;The Concise Handbook Of Real-Time Systems are Real-Time Systems? . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Real-Time System Application

Narasimhan, Priya

60

Timed Wp-Method: Testing Real-Time Systems  

Microsoft Academic Search

Real-time systems interact with their environment using time constrained input\\/output signals. Examples of real-time systems include patient monitoring systems, air traffic control systems, and telecommunication systems. For such systems, a functional misbehavior or a deviation from the specified time constraints may have catastrophic consequences. Therefore, ensuring the correctness of real-time systems becomes necessary. Two different techniques are usually used to

Abdeslam En-nouaary; Rachida Dssouli; Ferhat Khendek

2002-01-01

61

TCP'S USER MANUAL REAL TIME PHOTOMETRY (RTP)  

E-print Network

TCP'S USER MANUAL REAL TIME PHOTOMETRY (RTP) Last modified: 2011-09-20 This version by: Jorge manual ­ Real Time Photometry (RTP) 20/09/2011 2 1. INTRODUCTION CCD images normally require a lot of calibration work to be rendered useful for high precision photometry. It is therefore not unusual to spend

62

Real time modeling of human body dynamics  

Microsoft Academic Search

D real time human body dynamics modeling allows fast and correct assessment of internal forces distribut ion, providing measured by motion analysis kinematics. In this paper we touch upon a subject of unsupported human body motion modeling with real-time or interactive rate. Speed is very import ant when someone examines the reaction of human body on some external influence or

Ilya Phenichniy; Andrey Morozov; Victor Sholukha

63

Increasing transmission capacity by real time monitoring  

Microsoft Academic Search

Real time monitoring of the thermal capability of transmission lines can typically increase the line capability by 10-30%. This additional capability can be achieved with a typical cost of $80000-$120000 per circuit, which is generally a small fraction of a cost of a new line or a major physical upgrade. It thus appears clear that real time thermal rating could

Tapani O. Seppa

2002-01-01

64

Response Time Analysis of Gang Scheduling for Real Time Systems  

E-print Network

Response Time Analysis of Gang Scheduling for Real Time Systems Fabrício A. B. Silva, Ernesto P investigates the application of gang scheduling-based algorithms for real time systems that contain multiple processors. We derive the worst-case response time analysis for gang scheduling with and without machine

Cirne, Walfredo

65

Scheduling Policies for Real-Time and Non-Real-Time Traffic in a Statistical Multiplexer  

Microsoft Academic Search

The performance of several policies for scheduling real-time and non-real-time messages in a statistical multiplexer is examined. The performance metric for the real-time traffic is the percentage of messages not transmitted within their deadlines; the performance metric for the non-real-time traffic is the average delay. The scheduling policies are: (1) first-come first-served (FCFS); (2) head of the line priority, in

Renu Chipalkatti; James F. Kurose; Donald F. Towsley

1989-01-01

66

Real Time Search User Behavior Real time search is an increasingly important area of  

E-print Network

. The most frequently used terms accounted for only 0.03% of the total terms. Concerning search topics Web search. Searchers of real time content often repeat queries overtime, perhaps indicating long term content increasingly enters the main stream. Keywords Real time search, real time content, Collecta

Jansen, James

67

An Efficient Real-Time Middleware Scheduling Algorithm for Periodic Real-Time Tasks  

Microsoft Academic Search

\\u000a For real-time applications, the underlying operating system (OS) should support timely management of real-time tasks. However,\\u000a most of current operating systems do not provide timely management facilities in an efficient way. There could be two approaches\\u000a to support timely management facilities for real-time applications: (1) by modifying OS kernel and (2) by providing a middleware\\u000a without modifying OS. In our

Ho-joon Park; Chang-hoon Lee

2004-01-01

68

Real time sensor for therapeutic radiation delivery  

DOEpatents

The invention is a real time sensor for therapeutic radiation. A probe is placed in or near the patient that senses in real time the dose at the location of the probe. The strength of the dose is determined by either an insertion or an exit probe. The location is determined by a series of vertical and horizontal sensing elements that gives the operator a real time read out dose location relative to placement of the patient. The increased accuracy prevents serious tissue damage to the patient by preventing overdose or delivery of a dose to a wrong location within the body. 14 figs.

Bliss, M.; Craig, R.A.; Reeder, P.L.

1998-01-06

69

Real time sensor for therapeutic radiation delivery  

DOEpatents

The invention is a real time sensor for therapeutic radiation. A probe is placed in or near the patient that senses in real time the dose at the location of the probe. The strength of the dose is determined by either an insertion or an exit probe. The location is determined by a series of vertical and horizontal sensing elements that gives the operator a real time read out dose location relative to placement of the patient. The increased accuracy prevents serious tissue damage to the patient by preventing overdose or delivery of a dose to a wrong location within the body.

Bliss, Mary (West Richland, WA); Craig, Richard A. (West Richland, WA); Reeder, Paul L. (Richland, WA)

1998-01-01

70

Implementing Ada.Real_Time.Clock and Absolute Delays in Real-Time Kernels  

Microsoft Academic Search

A real-time kernel providing multitasking and timing services is a fundamental component of any real-time system. Timing services,\\u000a which are crucial to the correct execution of this kind of applications, are usually provided by a real-time clock and timer\\u000a manager, which is part of the kernel and implements the required functionality on top of the one or more hardware timers.

Juan Zamorano; José F. Ruiz; Juan Antonio De La Puente

2001-01-01

71

Analysis of real-time vibration data  

USGS Publications Warehouse

In recent years, a few structures have been instrumented to provide continuous vibration data in real time, recording not only large-amplitude motions generated by extreme loads, but also small-amplitude motions generated by ambient loads. The main objective in continuous recording is to track any changes in structural characteristics, and to detect damage after an extreme event, such as an earthquake or explosion. The Fourier-based spectral analysis methods have been the primary tool to analyze vibration data from structures. In general, such methods do not work well for real-time data, because real-time data are mainly composed of ambient vibrations with very low amplitudes and signal-to-noise ratios. The long duration, linearity, and the stationarity of ambient data, however, allow us to utilize statistical signal processing tools, which can compensate for the adverse effects of low amplitudes and high noise. The analysis of real-time data requires tools and techniques that can be applied in real-time; i.e., data are processed and analyzed while being acquired. This paper presents some of the basic tools and techniques for processing and analyzing real-time vibration data. The topics discussed include utilization of running time windows, tracking mean and mean-square values, filtering, system identification, and damage detection.

Safak, E.

2005-01-01

72

Real-time control over networks  

E-print Network

researchers to develop NCSs to implement distributed control schemes. This dissertation presents a framework for the modeling, design, stability analysis, control, and bandwidth allocation of real-time control over networks. This framework covers key research...

Ji, Kun

2007-09-17

73

The Power of Real-time PCR  

NSDL National Science Digital Library

Description of basic concepts, chemistries, and instrumentation of real-time polymerase chain reaction. Also includes present applications and future perspectives for this technology in biomedical sciences and in life science education

Mark A. Valasek (University of Texas Southwestern Medical Center Department of Physiology, Touchstone Center for Diabetes Research)

2005-09-01

74

Scheduling for Embedded Real-Time Systems  

Microsoft Academic Search

The authors review several approaches to control-oriented and dataflow-oriented software scheduling to determine whether a given technique can satisfy deadlines, throughput, and other constraints for embedded real-time systems

Felice Balarin; Luciano Lavagno; Praveen K. Murthy; Alberto L. Sangiovanni-vincentelli

1998-01-01

75

Embedded Distributed Real-Time Resource Management  

E-print Network

1 Embedded Distributed Real- Time Resource Management Carl Hein, Aron Rubin Lockheed Martin Management of Distributed Resources - General reoccurring problem. Resources may be heterogeneous - NP Hard, logistics, multi- sortie control of autonomous units, teams of UAV's, UGV's, UWV's, .... - Multi- computer

Kepner, Jeremy

76

Real time PCR measurement by fluorescence anisotropy  

E-print Network

Real-time polymerase chain reaction (PCR) is the gold-standard for quantitation in both mutation and gene expression analyses. Already this technique has found valuable clinical application in disease diagnosis and progression ...

Crane, Bryan Lee, 1976-

2005-01-01

77

Wittgenstein's papers & Faraday's Talks  

E-print Network

to believe that all his powers have been exerted for their pleasure and instruction --Michael Faraday ..WhatWittgenstein's papers & Faraday's Talks: Maxims for a milk-fed researcher Subbarao Kambhampati.D. graduates and 25 M.S. graduates #12;Wittgenstein? Faraday? The lecturer should give the audience full reason

Kambhampati, Subbarao

78

Interferometer real time control development for SIM  

NASA Astrophysics Data System (ADS)

Real Time Control (RTC) for the Space Interferometry Mission will build on the real time core interferometer control technology under development at JPL since the mid 1990s, with heritage from the ground based MKII and Palomar Testbed Interferometer projects developed in the late '80s and early '90s. The core software and electronics technology for SIM interferometer real time control is successfully operating on several SIM technology demonstration testbeds, including the Real-time Interferometer Control System Testbed, System Testbed-3, and the Microarcsecond Metrology testbed. This paper provides an overview of the architecture, design, integration, and test of the SIM flight interferometer real time control to meet challenging flight system requirements for the high processor throughput, low-latency interconnect, and precise synchronization to support microarcsecond-level astrometric measurements for greater than five years at 1 AU in Earth-trailing orbit. The electronics and software architecture of the interferometer real time control core and its adaptation to a flight design concept are described. Control loops for pointing and pathlength control within each of four flight interferometers and for coordination of control and data across interferometers are illustrated. The nature of onboard data processing to fit average downlink rates while retaining post-processed astrometric measurement precision and accuracy is also addressed. Interferometer flight software will be developed using a software simulation environment incorporating models of the metrology and starlight sensors and actuators to close the real time control loops. RTC flight software and instrument flight electronics will in turn be integrated utilizing the same simulation architecture for metrology and starlight component models to close real time control loops and verify RTC functionality and performance prior to delivery to flight interferometer system integration at Lockheed Martin's Sunnyvale facility. A description is provided of the test environment architecture supporting the RTC path to flight.

Bell, Charles E.

2003-02-01

79

Real-time scheduling using minimum search  

NASA Technical Reports Server (NTRS)

In this paper we consider a simple model of real-time scheduling. We present a real-time scheduling system called RTS which is based on Korf's Minimin algorithm. Experimental results show that the schedule quality initially improves with the amount of look-ahead search and tapers off quickly. So it sppears that reasonably good schedules can be produced with a relatively shallow search.

Tadepalli, Prasad; Joshi, Varad

1992-01-01

80

Real-time interferometric synthetic aperture microscopy  

PubMed Central

An interferometric synthetic aperture microscopy (ISAM) system design with real-time 2D cross-sectional processing is described in detail. The system can acquire, process, and display the ISAM reconstructed images at frame rates of 2.25 frames per second for 512 × 1024 pixel images. This system provides quantitatively meaningful structural information from previously indistinguishable scattering intensities and provides proof of feasibility for future real-time ISAM systems. PMID:18542337

Ralston, Tyler S.; Marks, Daniel L.; Carney, P. Scott; Boppart, Stephen A.

2010-01-01

81

Pervasive real-time biomedical monitoring system  

Microsoft Academic Search

With the tremendous advancements in low cost, power efficient hardware and the recent interest in biomedical embedded systems, numerous traditional biomedical systems can be replaced with smaller embedded systems that do real-time analysis to provide bio-feedback to the users. This paper presents a prototype of an embedded system which is capable of real-time data collection, using analog and digital sensors

Ajay Mathews Cheriyan; Albert Jarvi; Zbigniew Kalbarczyk; Ravishankar K Iyer; Kenneth L Watkin

2009-01-01

82

Using Linux for Real-Time Applications  

Microsoft Academic Search

We've selected a topic for practitioners in the embedded and real-time domains, namely how to use Linux for real-time applications. The article is hands-on: it not only summarizes selection criteria and introduction schemes for RTLinux but also shows how Linux was actually integrated in an existing (legacy) architecture. For small and medium-sized businesses to stay competitive, they need communication systems

Armand Marchesin

2004-01-01

83

Static Timing Analysis of Real-Time Operating System Code  

Microsoft Academic Search

Methods for Worst-Case Execution Time (WCET) analysis have been known for some time, and recently commercial tools have emerged. However, the technique has so far not been much used to anal- yse real production codes. Here, we present a case study where static WCET analysis was used to find upper time bounds for time-critical regions in a commercial real-time operating

Daniel Sandell; Andreas Ermedahl; Jan Gustafsson; Björn Lisper

2004-01-01

84

It's About Time: Real-Time Logics Reviewed  

Microsoft Academic Search

. We summarize and reorganize some of the last decade's researchon real-time extensions of temporal logic. Our main focus is ontableau constructions for model checking linear temporal formulas withtiming constraints. In particular, we find that a great deal of real-timeverification can be performed in polynomial space, but also that considerablecare must be exercised in order to keep the real-time verificationproblem

Thomas A. Henzinger

1998-01-01

85

Real-Time Water Data  

NSDL National Science Digital Library

This site provides access to streamflow data for USGS (United States Geological Survey) streamflow monitoring sites around the United States. The data can be searched using an interactive map or by state. Most stations report Station Number, Station Name, long-term median flow, present flow stage, present water temperature, and the date and time of the last entry. Most stations also have stream flow statistics for the period of record including the latest flow, minimum flow, maximum flow, mean flow, and exceedance probabilities. Many stations also have links to the station description, annual peak streamflow data, and other historical data.

86

Real-time transformer monitoring  

SciTech Connect

New technologies reduce costs and prevent power blackouts. Doctors learn much about a person`s health through blood tests. Power engineers can determine the health of a transformer by analyzing its vital fluid, the mineral dielectric oil. Thermal and electric stresses can cause the oil and cellulose materials in transformers to break down. This generates a variety of gases as by-products which dissolve in the oil. Monitoring the gas production abnormalities can save maintenance costs, help forecast and schedule repairs, costs, help forecast and schedule repairs, optimize loading during peak periods and predict transformer failure resulting in blackouts or even catastrophic accidents. Most utilities take oil samples periodically for dissolved gas analysis (DGA) laboratory testing. This is time- and labor-intensive and, more importantly, problems may not be detected before the transformer fails. Now there are several techniques for realtime, remote sampling so utilities can be alerted to both trends and sudden changes in transformer fault gas production.

Siuru, B.

1996-09-01

87

Real time flight simulation methodology  

NASA Technical Reports Server (NTRS)

An example sensitivity study is presented to demonstrate how a digital autopilot designer could make a decision on minimum sampling rate for computer specification. It consists of comparing the simulated step response of an existing analog autopilot and its associated aircraft dynamics to the digital version operating at various sampling frequencies and specifying a sampling frequency that results in an acceptable change in relative stability. In general, the zero order hold introduces phase lag which will increase overshoot and settling time. It should be noted that this solution is for substituting a digital autopilot for a continuous autopilot. A complete redesign could result in results which more closely resemble the continuous results or which conform better to original design goals.

Parrish, E. A.; Cook, G.; Mcvey, E. S.

1976-01-01

88

Active Faraday optical frequency standard.  

PubMed

We propose the mechanism of an active Faraday optical clock, and experimentally demonstrate an active Faraday optical frequency standard based on narrow bandwidth Faraday atomic filter by the method of velocity-selective optical pumping of cesium vapor. The center frequency of the active Faraday optical frequency standard is determined by the cesium 6 (2)S(1/2) F=4 to 6 (2)P(3/2) F'=4 and 5 crossover transition line. The optical heterodyne beat between two similar independent setups shows that the frequency linewidth reaches 281(23) Hz, which is 1.9×10(4) times smaller than the natural linewidth of the cesium 852-nm transition line. The maximum emitted light power reaches 75 ?W. The active Faraday optical frequency standard reported here has advantages of narrow linewidth and reduced cavity pulling, which can readily be extended to other atomic transition lines of alkali and alkaline-earth metal atoms trapped in optical lattices at magic wavelengths, making it useful for new generation of optical atomic clocks. PMID:25361349

Zhuang, Wei; Chen, Jingbiao

2014-11-01

89

Elapsed Time in the Real World  

NSDL National Science Digital Library

"This unit will introduce students to the concept of elapsed time using clocks and number lines. Students will explore elapsed time to the hour, half hour, and then minutes. Students will have the opportunity to develop the concept of measuring elapsed time in real world, problem-solving situations. Students should have a firm knowledge of telling time in order to begin this concept unit involving elapsed time." (from National Security Agency Central Security Service)

National Security Agency Central Security Service

2009-04-24

90

Real-time GPS monitoring throughout Cascadia  

NASA Astrophysics Data System (ADS)

Over 400 GPS receivers of the combined PANGA and PBO networks currently operate along the Cascadia subduction zone, all of which are high-rate and telemetered in real-time. These receivers span the M9 megathrust, M7 crustal faults beneath population centers, several active Cascades volcanoes, and a host of other hazard sources, and together enable a host of new approaches towards hazards mitigation. Data from the majority of the stations is received in real time at CWU and processed into one-second position estimates using 1) relative positioning within several reference frames constrained by 2) absolute point positioning using streamed satellite orbit and clock corrections. While the former produces lower-noise time series, for earthquakes greater than ~M7 and ground displacements exceeding ~20 cm, point positioning alone is shown to provide very rapid and robust estimates of the location and amplitude of both dynamic strong ground motion and permanent deformation. Raw phase and range observables from stations throughout Cascadia are being processed in real time at JPL and CWU into station positions, which in turn are analyzed also in real-time for earthquake processes at CWU. Our efforts can be broken down into three distinct areas: 1) Real-time point-positioning methodologies, 2) a data aggregator that captures real-time position streams from a variety of processing centers and methodologies (JPL RTGipsy, CWU rtPP, Trimble VRS) and re-streams the data as configurable streams to application clients out anywhere on the web, and 3) a suite of analysis tools that operate on the real-time position streams, including plotting, vectors, peak ground deformation contouring, and finite-fault inversions. This suite is currently bundled within a single client written in JAVA, called 'GPS Cockpit.'

Melbourne, T. I.; Santillan, V. M.; Scrivner, C. W.; Szeliga, W. M.; Webb, F.; Abundiz, S.

2012-12-01

91

REAL TIME SYSTEM OPERATIONS 2006-2007  

SciTech Connect

The Real Time System Operations (RTSO) 2006-2007 project focused on two parallel technical tasks: (1) Real-Time Applications of Phasors for Monitoring, Alarming and Control; and (2) Real-Time Voltage Security Assessment (RTVSA) Prototype Tool. The overall goal of the phasor applications project was to accelerate adoption and foster greater use of new, more accurate, time-synchronized phasor measurements by conducting research and prototyping applications on California ISO's phasor platform - Real-Time Dynamics Monitoring System (RTDMS) -- that provide previously unavailable information on the dynamic stability of the grid. Feasibility assessment studies were conducted on potential application of this technology for small-signal stability monitoring, validating/improving existing stability nomograms, conducting frequency response analysis, and obtaining real-time sensitivity information on key metrics to assess grid stress. Based on study findings, prototype applications for real-time visualization and alarming, small-signal stability monitoring, measurement based sensitivity analysis and frequency response assessment were developed, factory- and field-tested at the California ISO and at BPA. The goal of the RTVSA project was to provide California ISO with a prototype voltage security assessment tool that runs in real time within California ISO?s new reliability and congestion management system. CERTS conducted a technical assessment of appropriate algorithms, developed a prototype incorporating state-of-art algorithms (such as the continuation power flow, direct method, boundary orbiting method, and hyperplanes) into a framework most suitable for an operations environment. Based on study findings, a functional specification was prepared, which the California ISO has since used to procure a production-quality tool that is now a part of a suite of advanced computational tools that is used by California ISO for reliability and congestion management.

Eto, Joseph H.; Parashar, Manu; Lewis, Nancy Jo

2008-08-15

92

Real-time, high frequency QRS electrocardiograph  

NASA Technical Reports Server (NTRS)

Real time cardiac electrical data are received from a patient, manipulated to determine various useful aspects of the ECG signal, and displayed in real time in a useful form on a computer screen or monitor. The monitor displays the high frequency data from the QRS complex in units of microvolts, juxtaposed with a display of conventional ECG data in units of millivolts or microvolts. The high frequency data are analyzed for their root mean square (RMS) voltage values and the discrete RMS values and related parameters are displayed in real time. The high frequency data from the QRS complex are analyzed with imbedded algorithms to determine the presence or absence of reduced amplitude zones, referred to herein as RAZs. RAZs are displayed as go, no-go signals on the computer monitor. The RMS and related values of the high frequency components are displayed as time varying signals, and the presence or absence of RAZs may be similarly displayed over time.

Schlegel, Todd T. (Inventor); DePalma, Jude L. (Inventor); Moradi, Saeed (Inventor)

2006-01-01

93

Real-Time Mach: Towards a Predictable Real-Time System  

Microsoft Academic Search

Distributed real-time systems play a very important role in our modern society. They are used in aircraft control, communica- tion systems, military command and control systems, factory automation, and robotics. However, satisfying the rigid ti m- ing requirements of various real-time activities in distri buted real-time systems often requires ad hoc methods to tune the system's runtime behavior The objective

Hideyuki Tokuda; Tatsuo Nakajima; Prithvi Rao

1990-01-01

94

Hard Real-Time Programming is Different Peter Puschner  

E-print Network

Hard Real-Time Programming is Different £ Peter Puschner Institut f¨ur Technische Informatik requirements imposed on (hard) real- time code resp. non real-time code differ. As a consequence, conventional coding strategies as used to develop non real- time software are not suited for hard real-time code

95

Real Time Responsive Animation with Personality  

Microsoft Academic Search

Building on principles from prior work on procedural texture synthesis (K. Perlin, 1985), we are able to create remarkably lifelike, responsively animated characters in real time. Rhythmic and stochastic noise functions are used to define time varying parameters that drive computer generated puppets. Because we are conveying just the “texture” of motion, we are able to avoid computation of dynamics

Ken Perlin

1995-01-01

96

Real-Time Ionospheric Characterization and Modeling  

Microsoft Academic Search

Complete descriptions of spatial and temporal distributions of the ionosphere are obtained using a real-time ionospheric characterization (RTIC) system developed at CRS (and described by Ganguly and Brown, 2001). The system accepts data from various sources, regions, and times, then assimilates these data within the framework of physical ionospheric models, providing a 4-D description of the ionosphere anywhere in the

Suman Ganguly; Andrew Brown

97

Engineering Complex Real-Time Systems  

Microsoft Academic Search

This paper introduces a systems integration framework for engineering large-scale, heterogeneous, distributed real-time systems whose timing properties can be strictly controlled and analyzed. Our approach exploits the natural pipelining execution pattern found in a large number of continuous (periodic) applications executing over heterogenous, distributed resources. We formalize this distributed pipelining approach using a set of abstractions and transformations that enable

Saurav Chatterjee; Jay Strosnider

1995-01-01

98

Real-time swept source optical coherence  

E-print Network

-time data acquisition and image processing for the high-speed swept-source OCT. The digitizer streamedReal-time swept source optical coherence tomography imaging of the human airway using, Orange, California 92868 Abstract. A fast-scan-rate swept laser for optical coher- ence tomography OCT

Chen, Zhongping

99

Real-time scheduling of freight railroads  

Microsoft Academic Search

This article presents a model for the optimization of freight trains schedules that is intended to be used as part of a real-time control system. The goal of this model is to provide a link between strategic schedules, which might be decided every month, and line dispatching or CAD models which need to know the scheduled arrival and departure times

Patrick T. Harker

1995-01-01

100

Real-time interferometric synthetic aperture microscopy  

E-print Network

, and R. F. Bonner, "Subsurface imaging of living skin with optical coherence microscopy," Dermatology 191. Izatt, "Real-time in vivo color Doppler optical coherence tomography," J. Biomed. Opt. 7, 123-129 (2002-time assessment of retinal blood flow with ultrafast acquisition by color Doppler Fourier domain optical coherence

Bhargava, Rohit

101

Real-time Enhanced Vision System  

NASA Technical Reports Server (NTRS)

Flying in poor visibility conditions, such as rain, snow, fog or haze, is inherently dangerous. However these conditions can occur at nearly any location, so inevitably pilots must successfully navigate through them. At NASA Langley Research Center (LaRC), under support of the Aviation Safety and Security Program Office and the Systems Engineering Directorate, we are developing an Enhanced Vision System (EVS) that combines image enhancement and synthetic vision elements to assist pilots flying through adverse weather conditions. This system uses a combination of forward-looking infrared and visible sensors for data acquisition. A core function of the system is to enhance and fuse the sensor data in order to increase the information content and quality of the captured imagery. These operations must be performed in real-time for the pilot to use while flying. For image enhancement, we are using the LaRC patented Retinex algorithm since it performs exceptionally well for improving low-contrast range imagery typically seen during poor visibility conditions. In general, real-time operation of the Retinex requires specialized hardware. To date, we have successfully implemented a single-sensor real-time version of the Retinex on several different Digital Signal Processor (DSP) platforms. In this paper we give an overview of the EVS and its performance requirements for real-time enhancement and fusion and we discuss our current real-time Retinex implementations on DSPs.

Hines, Glenn D.; Rahman, Zia-Ur; Jobson, Daniel J.; Woodell, Glenn A.; Harrah, Steven D.

2005-01-01

102

Hard Real-Time: C++ Versus RTSJ  

NASA Technical Reports Server (NTRS)

In the domain of hard real-time systems, which language is better: C++ or the Real-Time Specification for Java (RTSJ)? Although ordinary Java provides a more productive programming environment than C++ due to its automatic memory management, that benefit does not apply to RTSJ when using NoHeapRealtimeThread and non-heap memory areas. As a result, RTSJ programmers must manage non-heap memory explicitly. While that's not a deterrent for veteran real-time programmers-where explicit memory management is common-the lack of certain language features in RTSJ (and Java) makes that manual memory management harder to accomplish safely than in C++. This paper illustrates the problem for practitioners in the context of moving data and managing memory in a real-time producer/consumer pattern. The relative ease of implementation and safety of the C++ programming model suggests that RTSJ has a struggle ahead in the domain of hard real-time applications, despite its other attractive features.

Dvorak, Daniel L.; Reinholtz, William K.

2004-01-01

103

Continuous, real time microwave plasma element sensor  

DOEpatents

Microwave-induced plasma is described for continuous, real time trace element monitoring under harsh and variable conditions. The sensor includes a source of high power microwave energy and a shorted waveguide made of a microwave conductive, refractory material communicating with the source of the microwave energy to generate a plasma. The high power waveguide is constructed to be robust in a hot, hostile environment. It includes an aperture for the passage of gases to be analyzed and a spectrometer is connected to receive light from the plasma. Provision is made for real time in situ calibration. The spectrometer disperses the light, which is then analyzed by a computer. The sensor is capable of making continuous, real time quantitative measurements of desired elements, such as the heavy metals lead and mercury. 3 figs.

Woskov, P.P.; Smatlak, D.L.; Cohn, D.R.; Wittle, J.K.; Titus, C.H.; Surma, J.E.

1995-12-26

104

Continuous, real time microwave plasma element sensor  

DOEpatents

Microwave-induced plasma for continuous, real time trace element monitoring under harsh and variable conditions. The sensor includes a source of high power microwave energy and a shorted waveguide made of a microwave conductive, refractory material communicating with the source of the microwave energy to generate a plasma. The high power waveguide is constructed to be robust in a hot, hostile environment. It includes an aperture for the passage of gases to be analyzed and a spectrometer is connected to receive light from the plasma. Provision is made for real time in situ calibration. The spectrometer disperses the light, which is then analyzed by a computer. The sensor is capable of making continuous, real time quantitative measurements of desired elements, such as the heavy metals lead and mercury.

Woskov, Paul P. (4 Ledgewood Dr., Bedford, MA 01730); Smatlak, Donna L. (10 Village Hill Rd., Belmont, MA 02178); Cohn, Daniel R. (26 Walnut Hill Rd., Chestnut Hill, MA 02167); Wittle, J. Kenneth (1740 Conestoga Rd., Chester Springs, PA 19425); Titus, Charles H. (323 Echo Valley La., Newton Square, PA 19072); Surma, Jeffrey E. (806 Brian La., Kennewick, WA 99337)

1995-01-01

105

Real-Time Sensor Validation System Developed  

NASA Technical Reports Server (NTRS)

Real-time sensor validation improves process monitoring and control system dependability by ensuring data integrity through automated detection of sensor data failures. The NASA Lewis Research Center, Expert Microsystems, and Intelligent Software Associates have developed an innovative sensor validation system that can automatically detect automated sensor failures in real-time for all types of mission-critical systems. This system consists of a sensor validation network development system and a real-time kernel. The network development system provides tools that enable systems engineers to automatically generate software that can be embedded within an application. The sensor validation methodology captured by these tools can be scaled to validate any number of sensors, and permits users to specify system sensitivity. The resulting software reliably detects all types of sensor data failures.

Zakrajsek, June F.

1998-01-01

106

Real-Time Visualization of Tissue Ischemia  

NASA Technical Reports Server (NTRS)

A real-time display of tissue ischemia which comprises three CCD video cameras, each with a narrow bandwidth filter at the correct wavelength is discussed. The cameras simultaneously view an area of tissue suspected of having ischemic areas through beamsplitters. The output from each camera is adjusted to give the correct signal intensity for combining with, the others into an image for display. If necessary a digital signal processor (DSP) can implement algorithms for image enhancement prior to display. Current DSP engines are fast enough to give real-time display. Measurement at three, wavelengths, combined into a real-time Red-Green-Blue (RGB) video display with a digital signal processing (DSP) board to implement image algorithms, provides direct visualization of ischemic areas.

Bearman, Gregory H. (Inventor); Chrien, Thomas D. (Inventor); Eastwood, Michael L. (Inventor)

2000-01-01

107

Real Time Linux - The RTOS for Astronomy?  

NASA Astrophysics Data System (ADS)

The BoF was attended by about 30 participants and a free CD of real time Linux-based upon RedHat 5.2-was available. There was a detailed presentation on the nature of real time Linux and the variants for hard real time: New Mexico Tech's RTL and DIAPM's RTAI. Comparison tables between standard Linux and real time Linux responses to time interval generation and interrupt response latency were presented (see elsewhere in these proceedings). The present recommendations are to use RTL for UP machines running the 2.0.x kernels and RTAI for SMP machines running the 2.2.x kernel. Support, both academically and commercially, is available. Some known limitations were presented and the solutions reported e.g., debugging and hardware support. The features of RTAI (scheduler, fifos, shared memory, semaphores, message queues and RPCs) were described. Typical performance statistics were presented: Pentium-based oneshot tasks running > 30kHz, 486-based oneshot tasks running at ~ 10 kHz, periodic timer tasks running in excess of 90 kHz with average zero jitter peaking to ~ 13 mus (UP) and ~ 30 mus (SMP). Some detail on kernel module programming, including coding examples, were presented showing a typical data acquisition system generating simulated (random) data writing to a shared memory buffer and a fifo buffer to communicate between real time Linux and user space. All coding examples were complete and tested under RTAI v0.6 and the 2.2.12 kernel. Finally, arguments were raised in support of real time Linux: it's open source, free under GPL, enables rapid prototyping, has good support and the ability to have a fully functioning workstation capable of co-existing hard real time performance. The counter weight-the negatives-of lack of platforms (x86 and PowerPC only at present), lack of board support, promiscuous root access and the danger of ignorance of real time programming issues were also discussed. See ftp://orion.tuc.noao.edu/pub/pnd/rtlbof.tgz for the StarOffice overheads for this presentation.

Daly, P. N.

108

Developing Improved Travel Time Reliability Measures For Real-time  

E-print Network

Developing Improved Travel Time Reliability Measures For Real-time And Archived ITS Data Applications Robert L. Bertini and Kate Lyman ITS Europe, Aalborg, Denmark June 20, 2007 #12; Travel time estimation more important Measure of consistency of trip's travel time Need for reliability indices More

Bertini, Robert L.

109

Calculating the Maximum Execution Time of Real-Time Programs  

Microsoft Academic Search

In real-time systems, the timing behavior is an important property of each task. It has to be guaranteed that the execution of a task does not take longer than the specified amount of time. Thus, a knowledge about the maximum execution time of programs is of utmost importance.

Peter P. Puschner; Christian Koza

1989-01-01

110

Faraday's Law and Ampere's Law  

Microsoft Academic Search

It is suggested that the origin of the induced electromotive force in a stationary circuit, given by Faraday's law of induction, could be made clearer to a beginning student if emphasis were placed in introductory courses on the geometry of the induced electric field set up by a time-varying magnetic field instead of on the line integral of this field

Francis W. Sears

1963-01-01

111

Machine vision for real time orbital operations  

NASA Technical Reports Server (NTRS)

Machine vision for automation and robotic operation of Space Station era systems has the potential for increasing the efficiency of orbital servicing, repair, assembly and docking tasks. A machine vision research project is described in which a TV camera is used for inputing visual data to a computer so that image processing may be achieved for real time control of these orbital operations. A technique has resulted from this research which reduces computer memory requirements and greatly increases typical computational speed such that it has the potential for development into a real time orbital machine vision system. This technique is called AI BOSS (Analysis of Images by Box Scan and Syntax).

Vinz, Frank L.

1988-01-01

112

Real-Time, Interactive Sonic Boom Display  

NASA Technical Reports Server (NTRS)

The present invention is an improved real-time, interactive sonic boom display for aircraft. By using physical properties obtained via various sensors and databases, the invention determines, in real-time, sonic boom impacts locations and intensities for aircraft traveling at supersonic speeds. The information is provided to a pilot via a display that lists a selectable set of maneuvers available to the pilot to mitigate sonic boom issues. Upon selection of a maneuver, the information as to the result of the maneuver is displayed and the pilot may proceed with making the maneuver, or provide new data to the system in order to calculate a different maneuver.

Haering, Jr., Edward A. (Inventor); Plotkin, Kenneth J. (Inventor)

2012-01-01

113

Real-Time Modelica Simulation on a Suse Linux Enterprise Real Time PC  

Microsoft Academic Search

This paper presents a real-time simulation system for a Suse Linux Enterprise Real-Time (SLERT) operat- ing system workstation. With this system can be executed Hardware-in-the-loop (HIL) simulation. HIL is the integration of real components and system models in a common simulation environment. The main focuses of this simulation system presented in this paper are the development and the validation of

Arno Ebner; Martin Ganchev; Helmut Oberguggenberger; Franz Pirker

2008-01-01

114

Real-time networking over HIPPI  

Microsoft Academic Search

HIPPI provides a very-high-speed communication medium, which is very well suited for a large number of bandwidth-demanding distributed applications. Unfortunately, its circuit-switched nature makes it very difficult to provide real-time guarantees when connections contend for network resources. We present a time-division-multiplex access scheme designed to give timing guarantees to high-speed connections. We describe the problem of scheduling the access to

Riccardo Bettati; Anisoara Nica

1995-01-01

115

12 54 2 LabVIEW Real-Time  

E-print Network

12 54 2 ISSP LabVIEW 2005 · X [1] LabVIEW Real-Time 2004 (SOR )SOR · X "Super SOR"OS PC Windows OS RealTime OS RealTime 2 RealTime OS ()( ) OS Phar Lap VxWorks 1 RealTime OS Super SOR 2008 ()() · RealTime · Super SOR · MATLAB/SimulinkDSP(Digital Signal

Katsumoto, Shingo

116

Real-Time Computerized Annotation of Pictures Real-Time Computerized Annotation of Pictures  

E-print Network

system: real-time automatic annotation of pictures Human evaluation on Web images Learning methodology D2 photos Jia Li, James Z. Wang alipr.com #12;Real-Time Computerized Annotation of Pictures ALIPR: Automatic,lake, rural, building tree, plant, people, water, garden animal, people, wild-life, dog, landscape Jia Li

Li, Jia

117

Real-time PCR detection chemistry.  

PubMed

Real-time PCR is the method of choice in many laboratories for diagnostic and food applications. This technology merges the polymerase chain reaction chemistry with the use of fluorescent reporter molecules in order to monitor the production of amplification products during each cycle of the PCR reaction. Thus, the combination of excellent sensitivity and specificity, reproducible data, low contamination risk and reduced hand-on time, which make it a post-PCR analysis unnecessary, has made real-time PCR technology an appealing alternative to conventional PCR. The present paper attempts to provide a rigorous overview of fluorescent-based methods for nucleic acid analysis in real-time PCR described in the literature so far. Herein, different real-time PCR chemistries have been classified into two main groups; the first group comprises double-stranded DNA intercalating molecules, such as SYBR Green I and EvaGreen, whereas the second includes fluorophore-labeled oligonucleotides. The latter, in turn, has been divided into three subgroups according to the type of fluorescent molecules used in the PCR reaction: (i) primer-probes (Scorpions, Amplifluor, LUX, Cyclicons, Angler); (ii) probes; hydrolysis (TaqMan, MGB-TaqMan, Snake assay) and hybridization (Hybprobe or FRET, Molecular Beacons, HyBeacon, MGB-Pleiades, MGB-Eclipse, ResonSense, Yin-Yang or displacing); and (iii) analogues of nucleic acids (PNA, LNA, ZNA, non-natural bases: Plexor primer, Tiny-Molecular Beacon). In addition, structures, mechanisms of action, advantages and applications of such real-time PCR probes and analogues are depicted in this review. PMID:25451956

Navarro, E; Serrano-Heras, G; Castaño, M J; Solera, J

2015-01-15

118

Real Time Grid Reliability Management 2005  

SciTech Connect

The increased need to manage California?s electricity grid in real time is a result of the ongoing transition from a system operated by vertically-integrated utilities serving native loads to one operated by an independent system operator supporting competitive energy markets. During this transition period, the traditional approach to reliability management -- construction of new transmission lines -- has not been pursued due to unresolved issues related to the financing and recovery of transmission project costs. In the absence of investments in new transmission infrastructure, the best strategy for managing reliability is to equip system operators with better real-time information about actual operating margins so that they can better understand and manage the risk of operating closer to the edge. A companion strategy is to address known deficiencies in offline modeling tools that are needed to ground the use of improved real-time tools. This project: (1) developed and conducted first-ever demonstrations of two prototype real-time software tools for voltage security assessment and phasor monitoring; and (2) prepared a scoping study on improving load and generator response models. Additional funding through two separate subsequent work authorizations has already been provided to build upon the work initiated in this project.

Eto, Joe; Eto, Joe; Lesieutre, Bernard; Lewis, Nancy Jo; Parashar, Manu

2008-07-07

119

Real time compression of triangle mesh connectivity  

Microsoft Academic Search

In this paper we introduce a new compressed representation for the connectivity of a triangle mesh. We present local compression and decompression algorithms which are fast enough for real time ap- plications. The achieved space compression rates keep pace with the best rates reported for any known global compression algorithm. These nice properties have great benefits for several important ap-

Stefan Gumhold; Wolfgang Straßer

1998-01-01

120

Real-Time Optimization Data Reconciliation & Parameter  

E-print Network

credit Optimization Case Study Characteristics 8 #12;6/24/11 5 Real-time Optimization: Components Plant (control system) ·Model mismatch, measured and unmeasured disturbances (w) Minu F(x, u, w) s.t. c(x, u, p gain in loop guaranteed by updating process sufficiently slowly. Plant DR-PE c

Grossmann, Ignacio E.

121

REAL TIME CONTROL OF URBAN DRAINAGE NETWORKS  

EPA Science Inventory

Real-time control (RTC) is a custom-designed, computer-assisted management technology for a specific sewerage network to meet the operational objectives of its collection/conveyance system. RTC can operate in several modes, including a mode that is activated during a wet weather ...

122

Real-Time Pencil Rendering Hyunjun Lee  

E-print Network

effects, the simulation-based approach for pencil drawing has a limitation in the rendering speed. The 2D This paper presents a real-time technique for rendering 3D meshes in the pencil drawing style. We analyze into the pencil drawing style [Mao et al. 2001]. Pen-and-ink illustration can be crowlove@postech.ac.kr, http

Lee, Seungyong

123

REAL-TIME DATA SERVICES MANAGEMENT TRANSPORTATION  

E-print Network

analytics · Manage equipment configuration · Usage billing Computer Storage Arrays, Telecommunication Equipment, Power Supplies · Monitor environmental constraints · Manage equipment configuration · Automate INVENTORY 3 2 2 02 129/58 4 1 3 INVENTORY REAL-TIME DATA LOCATION PROFILE: 4 2 1 SERVICES MANAGEMENT

Fisher, Kathleen

124

The Power of Real-Time PCR  

ERIC Educational Resources Information Center

In recent years, real-time polymerase chain reaction (PCR) has emerged as a robust and widely used methodology for biological investigation because it can detect and quantify very small amounts of specific nucleic acid sequences. As a research tool, a major application of this technology is the rapid and accurate assessment of changes in gene…

Valasek, Mark A.; Repa, Joyce J.

2005-01-01

125

Real-Time Dynamic Wrinkles Caroline Larboulette  

E-print Network

to be applied in real-time to every piece of cloth or to a fine mesh, especially in video games. One can. The user positions and orients wrinkling tools on a mesh. During animation, ge- ometric wrinkles it or editing its animation. At each animation step, the wrinkling effects are computed from these spec

Paris-Sud XI, Université de

126

Using UML for Real Time Geomatic Modelisation  

Microsoft Academic Search

Facing the increase of applications around spatial or spatio-temporal databases, the assistance brought to the designer of these bases remains very poor. As in the classic data base domain (no spatial) the use of conceptual models, methods and tools of design is very current, in the real time geoprocessing application domain it is the exception. Yet, these databases are very

Ben Youssef Malek; Lbath Ahmed; Belhadj Ziad

2009-01-01

127

Real-time PCR in virology  

Microsoft Academic Search

The use of the polymerase chain reaction (PCR) in molecular diagnostics has increased to the point where it is now accepted as the gold standard for detecting nucleic acids from a number of origins and it has become an essential tool in the research labora- tory. Real-time PCR has engendered wider acceptance of the PCR due to its improved rapidity,

Ian M. Mackay; Katherine E. Arden; Andreas Nitsche

2002-01-01

128

Real-time coordination of autonomous vehicles  

Microsoft Academic Search

Autonomous vehicles seem to be a promising approach to both reducing traffic congestion and improving road safety. However, for such vehicles to coexist safely, they need to coordinate their behaviour to ensure that they do not collide with each other. This coordination is typically based on (wireless) communication between vehicles and needs to satisfy stringent real-time constraints. However, realtime message

Mélanie Bouroche; Barbara Hughes; Vinny Cahill

2006-01-01

129

Distance Referencing: Real-Time Conference Tools.  

ERIC Educational Resources Information Center

Discusses how useful desktop conferencing has become in library services. Describes how real-time conference tools are convenient, efficient, cost-effective, and beneficial for those who are not able to come to the library. Presents a guide to current guide for conference tools for PC and Mac OS. (ontains 8 references.)(AUTH/MZ)

Jia, Peijun

2003-01-01

130

Real time animation of space plasma phenomena  

NASA Technical Reports Server (NTRS)

In pursuit of real time animation of computer simulated space plasma phenomena, the code was rewritten for the Massively Parallel Processor (MPP). The program creates a dynamic representation of the global bowshock which is based on actual spacecraft data and designed for three dimensional graphic output. This output consists of time slice sequences which make up the frames of the animation. With the MPP, 16384, 512 or 4 frames can be calculated simultaneously depending upon which characteristic is being computed. The run time was greatly reduced which promotes the rapid sequence of images and makes real time animation a foreseeable goal. The addition of more complex phenomenology in the constructed computer images is now possible and work proceeds to generate these images.

Jordan, K. F.; Greenstadt, E. W.

1987-01-01

131

A Light Lock Management Mechanism for Optimizing Real-Time and Non-Real-Time Performance in Embedded Linux  

Microsoft Academic Search

In a real-time Linux system, the critical sections are known as the main factor delaying the execution of real-time tasks. Traditional approaches to overcoming this issue have given less consideration to both real-time and non-real-time tasks. In this paper, we propose a new lock management mechanism to improve the real-time performance with a small penalty for non-real-time tasks. Using this

Maobing Dai; Toshihiro Matsui; Yutaka Ishikawa

2008-01-01

132

Real-Time Streamflow Data via Satellite  

NSDL National Science Digital Library

The US Geological Survey's Water Resources division in Anchorage, Alaska provides these real-time data from stream flow gages at observation stations in Alaska's (USA) Arctic Slope, Northwest, Southwest, South Central, Southeast, and Yukon Basin regions. Note that the data may be subject to significant change and "are not citeable until reviewed and approved by the USGS." Data include Long-term median flow, Flow, Stage, Water Temperature, and Date/ Time.

133

Real-time dynamics of string breaking.  

PubMed

We study the real-time dynamics of string breaking in quantum electrodynamics in one spatial dimension. A two-stage process with a clear separation of time and energy scales for the fermion-antifermion pair creation and subsequent charge separation leading to the screening of external charges is found. Going away from the traditional setup of external static charges, we establish the phenomenon of multiple string breaking by considering dynamical charges flying apart. PMID:24289673

Hebenstreit, F; Berges, J; Gelfand, D

2013-11-15

134

Real-time digital hardware pitch detector  

Microsoft Academic Search

A high-quality pitch detector has been built in digital hard-ware and operates in real time at a 10 kHz sampling rate. The hardware is capable of providing energy as well as pitch-period estimates. The pitch and energy computations are performed 100 times\\/s (i.e., once per 10 ms interval). The algorithm to estimate the pitch period uses center clipping, infinite peak

JOHN J. DUBNOWSKI; RONALD W. SCHAFER; L. Rabiner

1976-01-01

135

Real Time RF Simulator (RTS) and control  

SciTech Connect

The multi-cavity RTS allows LLRF algorithm development and lab testing prior to commissioning with real cavities and cryomodules. The RTS is a valuable tool since it models the functions, errors and disturbances of real RF systems. The advantage of a RTS over an off-line simulator is that it can be implemented on the actual LLRF hardware, on the same FPGA and processor, and run at the same speed of the LLRF control loop. Additionally the RTS can be shared by collaborators who do not have access to RF systems or when the systems are not available to LLRF engineers. The RTS simulator incorporates hardware, firmware and software errors and limitations of a real implementation, which would be hard to identify and time consuming to model in off-line simulations.

Cancelo, G.; Armiento, C.; Treptow, K.; Vignoni, A.; Zmuda, T.; /Fermilab

2008-10-01

136

Real Time Correction of Aircraft Flight Fonfiguration  

NASA Technical Reports Server (NTRS)

Method and system for monitoring and analyzing, in real time, variation with time of an aircraft flight parameter. A time-dependent recovery band, defined by first and second recovery band boundaries that are spaced apart at at least one time point, is constructed for a selected flight parameter and for a selected time recovery time interval length .DELTA.t(FP;rec). A flight parameter, having a value FP(t=t.sub.p) at a time t=t.sub.p, is likely to be able to recover to a reference flight parameter value FP(t';ref), lying in a band of reference flight parameter values FP(t';ref;CB), within a time interval given by t.sub.p.ltoreq.t'.ltoreq.t.sub.p.DELTA.t(FP;rec), if (or only if) the flight parameter value lies between the first and second recovery band boundary traces.

Schipper, John F. (Inventor)

2009-01-01

137

Real Time Pricing and the Real Live Firm  

SciTech Connect

Energy economists have long argued the benefits of real time pricing (RTP) of electricity. Their basis for modeling customers response to short-term fluctuations in electricity prices are based on theories of rational firm behavior, where management strives to minimize operating costs and optimize profit, and labor, capital and energy are potential substitutes in the firm's production function. How well do private firms and public sector institutions operating conditions, knowledge structures, decision-making practices, and external relationships comport with these assumptions and how might this impact price response? We discuss these issues on the basis of interviews with 29 large (over 2 MW) industrial, commercial, and institutional customers in the Niagara Mohawk Power Corporation service territory that have faced day-ahead electricity market prices since 1998. We look at stories interviewees told about why and how they respond to RTP, why some customers report that they can't, and why even if they can, they don't. Some firms respond as theorized, and we describe their load curtailment strategies. About half of our interviewees reported that they were unable to either shift or forego electricity consumption even when prices are high ($0.50/kWh). Reasons customers gave for why they weren't price-responsive include implicit value placed on reliability, pricing structures, lack of flexibility in adjusting production inputs, just-in-time practices, perceived barriers to onsite generation, and insufficient time. We draw these observations into a framework that could help refine economic theory of dynamic pricing by providing real-world descriptions of how firms behave and why.

Moezzi, Mithra; Goldman, Charles; Sezgen, Osman; Bharvirkar, Ranjit; Hopper, Nicole

2004-05-26

138

Flexible Real-Time Linux*: A Flexible Hard Real-Time Environment  

Microsoft Academic Search

This paper presents a framework appropriate for Flexible Real-Time Systems (FRTS) and a run-time support system based on that framework, called Flexible Real-Time Linux (FRTL). The framework proposes to build each task as a sequence of mandatory and optional components and to separate their execution in two scheduling levels. This approach is shown to provide both hard guarantees and flexible

Andrés Terrasa; Ana García-Fornes; Vicente J. Botti

2002-01-01

139

Support QoS in Open Real-Time Systems  

Microsoft Academic Search

With the development of computer systems, the realtime systems with different kinds of real-time applications and non-real-time applications are becoming more and more popular. At the same time, more and more multimedia applications make real-time system to support QoS. Based on the real-time systems, the paper proposes a model of Linux-based open real-time systems with QoS support. Firstly, the paper

Zhu Xiangbin; Jinhua Zhejiang

2008-01-01

140

CUDA-based real time surgery simulation.  

PubMed

In this paper we present a general software platform that enables real time surgery simulation on the newly available compute unified device architecture (CUDA)from NVIDIA. CUDA-enabled GPUs harness the power of 128 processors which allow data parallel computations. Compared to the previous GPGPU, it is significantly more flexible with a C language interface. We report implementation of both collision detection and consequent deformation computation algorithms. Our test results indicate that the CUDA enables a twenty times speedup for collision detection and about fifteen times speedup for deformation computation on an Intel Core 2 Quad 2.66 GHz machine with GeForce 8800 GTX. PMID:18391300

Liu, Youquan; De, Suvranu

2008-01-01

141

Tuning Linux to meet real time requirements  

NASA Astrophysics Data System (ADS)

There is a desire to use Linux in military systems. Customers are requesting contractors to use open source to the maximal possible extent in contracts. Linux is probably the best operating system of choice to meet this need. It is widely used. It is free. It is royalty free, and, best of all, it is completely open source. However, there is a problem. Linux was not originally built to be a real time operating system. There are many places where interrupts can and will be blocked for an indeterminate amount of time. There have been several attempts to bridge this gap. One of them is from RTLinux, which attempts to build a microkernel underneath Linux. The microkernel will handle all interrupts and then pass it up to the Linux operating system. This does insure good interrupt latency; however, it is not free [1]. Another is RTAI, which provides a similar typed interface; however, the PowerPC platform, which is used widely in real time embedded community, was stated as "recovering" [2]. Thus this is not suited for military usage. This paper provides a method for tuning a standard Linux kernel so it can meet the real time requirement of an embedded system.

Herbel, Richard S.; Le, Dang N.

2007-04-01

142

Michael Faraday's Bicentenary.  

ERIC Educational Resources Information Center

Six articles discuss the work of Michael Faraday, a chemist whose work revolutionized physics and led directly to both classical field and relativity theory. The scientist as a young man, the electromagnetic experiments of Faraday, his search for the gravelectric effect, his work on optical glass, his laboratory notebooks, and his creative use of…

Williams, L. Pearce; And Others

1991-01-01

143

Real-Time Strategy Game AI and More Michael Buro  

E-print Network

Real-Time Strategy Game AI and More Michael Buro GAMES Group University of Alberta (Game-playing, Analytical methods, Minimax search and Empirical Studies) November 2, 2005 Real-Time Strategy Game AI and More : 1 / 12 Outline 1 GAMES Group 2 Real-Time Strategy Games and AI Real-Time Strategy Game AI

Buro, Michael

144

Measuring OS Support for Real-time CORBA ORBs  

E-print Network

operating systems with real-time extensions, Windows NT, Solaris, and Linux, for real-time ORB middleware with real-time extensions, i.e., Solaris, Windows NT, and Linux; and Sec- tion 4 presents concluding remarksMeasuring OS Support for Real-time CORBA ORBs David L. Levine, Douglas C. Schmidt, and Sergio

Schmidt, Douglas C.

145

Visualizations for Real-time Pricing Demonstration  

SciTech Connect

In this paper, the visualization tools created for monitoring the operations of a real-time pricing demonstration system that runs at a distribution feeder level are presented. The information these tools provide gives insights into demand behavior from automated price responsive devices, distribution feeder characteristics, impact of weather on system’s development, and other significant dynamics. Given the large number of devices that bid into a feeder-level real-time electricity market, new techniques are explored to summarize the present state of the system and contrast that with previous trends as well as future projections. To better understand the system behavior and correctly inform decision-making procedures, effective visualization of the data is imperative.

Marinovici, Maria C.; Hammerstrom, Janelle L.; Widergren, Steven E.; Dayley, Greg K.

2014-10-13

146

CIESE Real Time Data Projects: Tsunami Surge  

NSDL National Science Digital Library

This internet-based project for Grades 6-12 taps into real-time data as the framework for a student investigation of tsunami phenomena. First, students look at historical information on five tsunamis, then interactively explore the science behind tsunamis and wave behavior. Next, students will access and interpret existing data from the highly destructive 2004 Indian Ocean tsunami. Finally, students take on roles as scientists to develop a global tsunami preparedness plan based on a budget. They must support their ideas with evidence from reliable data and present arguments based upon their studies. Included are detailed project instructions, teacher's guide, reference material, and a student discussion forum. This project is part of the CIESE K-12 Curriculum Program's Real Time Data Projects. See Related Materials for a link to the full index of data projects.

2012-04-14

147

Pose detection of cameras in real time  

NASA Astrophysics Data System (ADS)

This work introduces a novel approach to the precise estimation, in real-time, of pose parameters of planar three-dimensional object. A suitable set of coplanar marks is used to calculate the tilt and pan angles values of the planar object. Feature points are calculated with subpixel accuracy and a weighted approach is applied to reduce variations in feature points positions due to noise. An application of this method is also shown for virtual TV sets.

Cozar, Julian R.; Guil, Nicolas; Zapata, Emilio L.

2003-01-01

148

Real-Time X-Ray Inspection  

NASA Technical Reports Server (NTRS)

X-ray imaging instrument adapted to continuous scanning. Modern version of fluoroscope enables rapid x-ray inspection of parts. Developed for detection of buckling in insulated ducts. Uses radiation from radioactive gadolinium or thallium source. Instrument weighs only 6 1/2 lb. Quickly scanned by hand along duct surface, providing real-time image. Based on Lixiscope, developed at Goddard Space Flight Center.

Bulthuis, Ronald V.

1988-01-01

149

Real time simulation of a tornado  

Microsoft Academic Search

We present a novel method for simulating a tornado scene and its damage on the environment in real time, which is recognized as a challenging task for researchers of computer graphics. The method adopts a Reynold-average two-fluid model (RATFM) for modeling the motion of a tornado. In RATFM, the air flow (wind field) is simulated by Reynold-average Navier-Stokes equations. The

Shiguang Liu; Zhangye Wang; Zheng Gong; Qunsheng Peng

2007-01-01

150

Thermal imaging with real time picture presentation.  

PubMed

The accomplishment of thermal imaging with real-time picture presentation represents a significant advance in nondestructive testing. Described here is the AGA Thermovision, capable of producing such imaging. Operating principles, basic features, and recording techniques are reviewed, and a survey is made of the range of applications. Examples include electrical power distribution elements, a turbine blade, and a missile model in a wind tunnel. PMID:20068870

Borg, S B

1968-09-01

151

The real-time polymerase chain reaction  

Microsoft Academic Search

The scientific, medical, and diagnostic communities have been presented the most powerful tool for quantitative nucleic acids analysis: real-time PCR [Bustin, S.A., 2004. A–Z of Quantitative PCR. IUL Press, San Diego, CA]. This new technique is a refinement of the original Polymerase Chain Reaction (PCR) developed by Kary Mullis and coworkers in the mid 80:ies [Saiki, R.K., et al., 1985.

Mikael Kubista; José Manuel Andrade; Martin Bengtsson; Amin Forootan; Jiri Jonák; Kristina Lind; Radek Sindelka; Robert Sjöback; Björn Sjögreen; Linda Strömbom; Anders Ståhlberg; Neven Zoric

2006-01-01

152

A real-time face tracker  

Microsoft Academic Search

The authors present a real-time face tracker. The system has achieved a rate of 30+ frames\\/second using an HP-9000 workstation with a frame grabber and a Canon VC-Cl camera. It can track a person's face while the person moves freely (e.g., walks, jumps, sits down and stands up) in a room. Three types of models have been employed in developing

Jie Yang; Alex Waibel

1996-01-01

153

Real time volumetric ultrasound imaging system  

Microsoft Academic Search

A real time volumetric ultrasound imaging system has been developed for medical diagnosis. The scanner produces images analogous\\u000a to an optical camera and supplies more information than conventional sonograms. Potential medical applications include improved\\u000a anatomic visualization, tumor localization, and better assessment of cardiac function. The system uses pulse-echo phased array\\u000a principles to steer a two-dimensional array transducer of 289 elements

Olaf T. von Ramm; Stephen W. Smith

1990-01-01

154

Real-time optical image processing techniques  

NASA Technical Reports Server (NTRS)

Nonlinear real-time optical processing on spatial pulse frequency modulation has been pursued through the analysis, design, and fabrication of pulse frequency modulated halftone screens and the modification of micro-channel spatial light modulators (MSLMs). Micro-channel spatial light modulators are modified via the Fabry-Perot method to achieve the high gamma operation required for non-linear operation. Real-time nonlinear processing was performed using the halftone screen and MSLM. The experiments showed the effectiveness of the thresholding and also showed the needs of higher SBP for image processing. The Hughes LCLV has been characterized and found to yield high gamma (about 1.7) when operated in low frequency and low bias mode. Cascading of two LCLVs should also provide enough gamma for nonlinear processing. In this case, the SBP of the LCLV is sufficient but the uniformity of the LCLV needs improvement. These include image correlation, computer generation of holograms, pseudo-color image encoding for image enhancement, and associative-retrieval in neural processing. The discovery of the only known optical method for dynamic range compression of an input image in real-time by using GaAs photorefractive crystals is reported. Finally, a new architecture for non-linear multiple sensory, neural processing has been suggested.

Liu, Hua-Kuang

1988-01-01

155

The IGS Real-Time Service  

NASA Astrophysics Data System (ADS)

The IGS Real-Time Service (RTS) is being rolled out in 2013 following the successful completion of the IGS Real-Time Pilot Project. The RTS has recently completed beta testing and is now operating at the level of initial operating capability. The service will reach full operating capability by the end of 2013. RTS products include GNSS data streams and GNSS orbit and clock correction streams. These products are available in real-time in accordance with the IGS open-data policy using RTCM standard formats and the NTRIP transportation protocol. The RTS is key to IGS's support of the GGOS Natural Hazards theme. Of particular importance in this context is the high degree of redundancy that is build into the RTS in order to reliably support public-good scientific applications commonly associated with natural hazards; for example, precise-point positioning applications requiring high accuracy and low latency related to earthquakes and tsunamis . This presentation will illustrate the data gathering through product generation to user distribution design of the RTS, highlighting built-in robustness at various stages. The presentation will also present an assessment of the performance of the service to date.

Caissy, Mark; Agrotis, Loukis; Weber, Georg; Fisher, Steven

2013-04-01

156

Software Analyzes Complex Systems in Real Time  

NASA Technical Reports Server (NTRS)

Expert system software programs, also known as knowledge-based systems, are computer programs that emulate the knowledge and analytical skills of one or more human experts, related to a specific subject. SHINE (Spacecraft Health Inference Engine) is one such program, a software inference engine (expert system) designed by NASA for the purpose of monitoring, analyzing, and diagnosing both real-time and non-real-time systems. It was developed to meet many of the Agency s demanding and rigorous artificial intelligence goals for current and future needs. NASA developed the sophisticated and reusable software based on the experience and requirements of its Jet Propulsion Laboratory s (JPL) Artificial Intelligence Research Group in developing expert systems for space flight operations specifically, the diagnosis of spacecraft health. It was designed to be efficient enough to operate in demanding real time and in limited hardware environments, and to be utilized by non-expert systems applications written in conventional programming languages. The technology is currently used in several ongoing NASA applications, including the Mars Exploration Rovers and the Spacecraft Health Automatic Reasoning Pilot (SHARP) program for the diagnosis of telecommunication anomalies during the Neptune Voyager Encounter. It is also finding applications outside of the Space Agency.

2008-01-01

157

Real-time monitoring system for microfluidics  

NASA Astrophysics Data System (ADS)

A new non-invasive real-time system for the monitoring and control of microfluidodynamic phenomena is proposed. The general purpose design of such system is suitable for in vitro and in vivo experimental setup and therefore for microfluidic application in the biomedical field such as lab-on-chip and for research studies in the field of microcirculation. The system consists of an ad hoc optical setup for image magnification providing images suitable for image acquisition and processing. The optic system was designed and developed using discrete opto-mechanic components mounted on a breadboard in order to provide an optic path accessible at any point where the information needs to be acquired. The optic sensing, acquisition, and processing were performed using an integrated vision system based on the Cellular Nonlinear Networks (CNNs) analogic technology called Focal Plane Processor (FPP, Eye-RIS, Anafocus) and inserted in the optic path. Ad hoc algorithms were implemented for the real-time analysis and extraction of fluido-dynamic parameters in micro-channels. They were tested on images recorded during in vivo microcirculation experiments on hamsters and then they were applied on images optically acquired and processed in real-time during in vitro experiments on a continuous microfluidic device (serpentine mixer, ThinXXS) with a two-phase fluid.

Sapuppo, F.; Cantelli, G.; Fortuna, L.; Arena, P.; Bucolo, M.

2007-05-01

158

Acting to gain information: Real-time reasoning meets real-time perception  

NASA Technical Reports Server (NTRS)

Recent advances in intelligent reactive systems suggest new approaches to the problem of deriving task-relevant information from perceptual systems in real time. The author will describe work in progress aimed at coupling intelligent control mechanisms to real-time perception systems, with special emphasis on frame rate visual measurement systems. A model for integrated reasoning and perception will be discussed, and recent progress in applying these ideas to problems of sensor utilization for efficient recognition and tracking will be described.

Rosenschein, Stan

1994-01-01

159

17 CFR 43.3 - Method and timing for real-time public reporting.  

Code of Federal Regulations, 2014 CFR

...2014-04-01 false Method and timing for real-time public reporting. 43.3 Section 43...TRADING COMMISSION (CONTINUED) REAL-TIME PUBLIC REPORTING § 43.3 Method and timing for real-time public reporting. (a)...

2014-04-01

160

Paravirtualizing Linux in a real-time hypervisor  

Microsoft Academic Search

This paper describes a new hypervisor built to run Linux in a virtual machine. This hypervisor is built inside Anaxagoros, a real-time microkernel designed to execute safely hard real-time and non real-time tasks. This allows the execution of hard real-time tasks in parallel with Linux virtual machines without interfering with the execution of the real-time tasks. We implemented this hypervisor

Vincent Legout; Matthieu Lemerre

161

Real-Time Earthquake Forecasting in Italy  

NASA Astrophysics Data System (ADS)

We apply an earthquake clustering epidemic model to real-time data of the Italian Earthquake Data Center operated by the Istituto Nazionale di Geofisica e Vulcanologia since January 2006 for short-term moderate and large earthquakes forecasting in Italy based on smoothed seismicity. The forecast uses earthquake data only, with no explicit use of tectonic, geologic, or geodetic information. In this model every earthquake can be regarded at the same time as triggered by previous events and triggering following earthquakes. The occurrence rate density, at any instant of time and geographical point, is computed by the contribution of every previous events using a kernel function that takes in proper account: (a) the magnitude of the triggering earthquake, (b) the spatial distance from the triggering event, and (c) the time interval between the triggering event and the instant considered for the computation. The magnitude distribution adopted here is the Gutenberg- Richter law. Though the learning data set fort the best fit of the model parameters goes from 1985 to 2005, the application of this clustering model developed for short-term forecasting gives much stronger weight to recent events than to older ones. Retrospective tests on real seismicity of Italy, California, Greece, Japan and comparison with a plain time- independent Poisson model through likelihood-based methods were made, proving the validity of this model. The results are displayed as time-dependent maps showing both the expected rate density of Ml ? 4.0 earthquakes and the probability of ground shaking exceeding Modified Mercalli Intensity VI in an area of 100 km2 around the zone of maximum expected rate density in the next 24 hours. For testing purposes, the overall probability of occurrence of an Ml ? 4.5 earthquake in the same area of 100 km2 is also estimated. A few preliminary results will be shown. Forecast verification procedures in real time will be carried out by statistical tools as the Relative Operating Characteristics (ROC) and Molchan's error diagrams. The seismic hazard modeling approach so developed is expected to provide a useful contribution to real time earthquake hazard assessment, even with a possible practical application for decision making and public information.

Murru, M.; Console, R.; Falcone, G.

2006-12-01

162

Coherent integration: to real time or not to real time? That is the question.  

NASA Astrophysics Data System (ADS)

Performing long coherent integrations is now widely accepted as one of the best methods for improving the signal-to-noise ratio of fringe measurements. There are two basic ways of carrying out coherent integration. One method, real-time coherent integration, stabilizes the fringes on a detector in real time using a separate detector and feedback loop. In order for this to work, the fringes must be stabilized (nominally to less than one radian) and the response-time of the fringe-tracking loop must be less than a coherence time. The other method, post-processing coherent integration, records the fringe and instrument data with minimum integration and assembles the coherently integrated visibilities after the fact. While recording fringe data for post-processing coherent integration it is only necessary to stabilize to less than the coherence length of the individual channels. In terms of fringe stabilization, in the absence of read-noise, post-processing performs significantly better than real-time coherent integration, one the order of a factor two smaller fringe tracking error. This results in improved SNR, reduced integration time, and the ability to coherently integrate on fainter targets. In cases of sufficiently large detector read noise the situation can change to the point where real-time coherent integration produces better SNR. Real-time coherent integration is thus the less efficient of the two, and should only be employed when detector read noise prevents post-processing coherent integration.

Jorgensen, Anders M.; Mozurkewich, Dave

2010-07-01

163

Subsystem real-time Time Dependent Density Functional Theory  

E-print Network

We present the extension of Frozen Density Embedding (FDE) theory to real-time Time Dependent Density Functional Theory (rt-TDDFT). FDE a is DFT-in-DFT embedding method that allows to partition a larger Kohn-Sham system into a set of smaller, coupled Kohn-Sham systems. Additional to the computational advantage, FDE provides physical insight into the properties of embedded systems and the coupling interactions between them. The extension to rt-TDDFT is done straightforwardly by evolving the Kohn-Sham subsystems in time simultaneously, while updating the embedding potential between the systems at every time step. Two main applications are presented: the explicit excitation energy transfer in real time between subsystems is demonstrated for the case of the Na$_4$ cluster and the effect of the embedding on optical spectra of coupled chromophores. In particular, the importance of including the full dynamic response in the embedding potential is demonstrated.

Krishtal, Alisa; Pavanello, Michele

2015-01-01

164

Optimizing real-time RDF data streams  

E-print Network

The Resource Description Framework (RDF) provides a common data model for the integration of "real-time" social and sensor data streams with the Web and with each other. While there exist numerous protocols and data formats for exchanging dynamic RDF data, or RDF updates, these options should be examined carefully in order to enable a Semantic Web equivalent of the high-throughput, low-latency streams of typical Web 2.0, multimedia, and gaming applications. This paper contains a brief survey of RDF update formats and a high-level discussion of both TCP and UDP-based transport protocols for updates. Its main contribution is the experimental evaluation of a UDP-based architecture which serves as a real-world example of a high-performance RDF streaming application in an Internet-scale distributed environment.

Shinavier, Joshua

2010-01-01

165

Modeling fibril fragmentation in real-time  

NASA Astrophysics Data System (ADS)

During the application of the mass-action-equation models to the study of amyloid fiber formation, time-consuming numerical calculations constitute a major bottleneck. To conquer this difficulty, here an alternative efficient method is introduced for the fragmentation-only model. It includes two basic steps: (1) simulate close-formed time-evolutionary equations for the number concentration P(t) derived from the moment-closure method; (2) reconstruct the detailed fiber length distribution based on the knowledge of moments obtained in the first step. Compared to direct calculation, our method speeds up the performance by at least 10 000 times (from days to seconds). The accuracy is also satisfactory if suitable functions for the approximate fibril length distribution are taken. Further application to the sonication studies on PI264-b-PFS48 micelles performed by Guerin et al. confirms our method is very promising for the real-time analysis of the experiments on fibril fragmentation.

Tan, Pengzhen; Hong, Liu

2013-08-01

166

Real time visualization of quantum walk  

SciTech Connect

Time evolution of quantum particles like electrons is described by time-dependent Schrödinger equation (TDSE). The TDSE is regarded as the diffusion equation of electrons with imaginary diffusion coefficients. And the TDSE is solved by quantum walk (QW) which is regarded as a quantum version of a classical random walk. The diffusion equation is solved in discretized space/time as in the case of classical random walk with additional unitary transformation of internal degree of freedom typical for quantum particles. We call the QW for solution of the TDSE a Schrödinger walk (SW). For observation of one quantum particle evolution under a given potential in atto-second scale, we attempt a successive computation and visualization of the SW. Using Pure Data programming, we observe the correct behavior of a probability distribution under the given potential in real time for observers of atto-second scale.

Miyazaki, Akihide; Hamada, Shinji; Sekino, Hideo [Department of Computer Science and Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka Tenpaku-cho, Toyohashi, 441-8580 Aichi (Japan)

2014-02-20

167

Finding Response Times in a Real-Time System  

Microsoft Academic Search

There are two major performance issues in a real-time system where a processor has a set of devices connected to it at different priority levels. The first is to prove whether, for a given assignment of devices to priority levels, the system can handle its peak processing load without losing any inputs from the devices. The second is to determine

Mathai Joseph; Paritosh K. Pandya

1986-01-01

168

Exploring Earthquakes in Real-Time  

NASA Astrophysics Data System (ADS)

Earthquakes capture the attention of students and inspire them to explore the Earth. Adding the ability to view and explore recordings of significant and newsworthy earthquakes in real-time makes the subject even more compelling. To address this opportunity, the Incorporated Research Institutions for Seismology (IRIS), in collaboration with Moravian College, developed ';jAmaSeis', a cross-platform application that enables students to access real-time earthquake waveform data. Students can watch as the seismic waves are recorded on their computer, and can be among the first to analyze the data from an earthquake. jAmaSeis facilitates student centered investigations of seismological concepts using either a low-cost educational seismograph or streamed data from other educational seismographs or from any seismic station that sends data to the IRIS Data Management System. After an earthquake, students can analyze the seismograms to determine characteristics of earthquakes such as time of occurrence, distance from the epicenter to the station, magnitude, and location. The software has been designed to provide graphical clues to guide students in the analysis and assist in their interpretations. Since jAmaSeis can simultaneously record up to three stations from anywhere on the planet, there are numerous opportunities for student driven investigations. For example, students can explore differences in the seismograms from different distances from an earthquake and compare waveforms from different azimuthal directions. Students can simultaneously monitor seismicity at a tectonic plate boundary and in the middle of the plate regardless of their school location. This can help students discover for themselves the ideas underlying seismic wave propagation, regional earthquake hazards, magnitude-frequency relationships, and the details of plate tectonics. The real-time nature of the data keeps the investigations dynamic, and offers students countless opportunities to explore.

Bravo, T. K.; Kafka, A. L.; Coleman, B.; Taber, J. J.

2013-12-01

169

Real-time structured light depth extraction  

NASA Astrophysics Data System (ADS)

Gathering depth data using structured light has been a procedure for many different environments and uses. Many of these system are utilized instead of laser line scanning because of their quickness. However, to utilize depth extraction for some applications, in our case laparoscopic surgery, the depth extraction must be in real time. We have developed an apparatus that speeds up the raw image display and grabbing in structured light depth extraction from 30 frames per second to 60 and 180 frames per second. This results in an updated depth and texture map of about 15 times per second versus about 3. This increased update rate allows for real time depth extraction for use in augmented medical/surgical applications. Our miniature, fist-sized projector utilizes an internal ferro-reflective LCD display that is illuminated with cold light from a flex light pipe. The miniature projector, attachable to a laparoscope, displays inverted pairs of structured light into the body where these images are then viewed by a high-speed camera set slightly off axis from the projector that grabs images synchronously. The images from the camera are ported to a graphics-processing card where six frames are worked on simultaneously to extract depth and create mapped textures from these images. This information is then sent to the host computer with 3D coordinate information of the projector/camera and the associated textures. The surgeon is then able to view body images in real time from different locations without physically moving the laparoscope imager/projector, thereby, reducing the trauma of moving laparoscopes in the patient.

Keller, Kurtis; Ackerman, Jeremy D.

2000-03-01

170

Real-time computed optical interferometric tomography  

NASA Astrophysics Data System (ADS)

High-resolution tomography is of great importance to many areas of biomedical imaging, but with it comes several apparent tradeoffs such as a narrowing depth-of-field and increasing optical aberrations. Overcoming these challenges has attracted many hardware and computational solutions. Hardware solutions, though, can become bulky or expensive and computational approaches can require high computing power or large processing times. This study demonstrates memory efficient implementations of interferometric synthetic aperture microscopy (ISAM) and computational adaptive optics (CAO) - two computational approaches for overcoming the depthof- field limitation and the effect of optical aberrations in optical coherence tomography (OCT). Traditionally requiring lengthy post processing, here we report implementations of ISAM and CAO on a single GPU for real-time in vivo imaging. Real-time, camera-limited ISAM processing enabled reliable acquisition of stable data for in vivo imaging, and CAO processing on the same GPU is shown to quickly correct static aberrations. These algorithmic advances hold the promise for high-resolution volumetric imaging in time-sensitive situations as well as enabling aberrationfree cellular-level volumetric tomography.

Shemonski, Nathan D.; Liu, Yuan-Zhi; Ahmad, Adeel; Adie, Steven G.; Carney, P. Scott; Boppart, Stephen A.

2014-03-01

171

Real-time design with peer tasks  

NASA Technical Reports Server (NTRS)

We introduce a real-time design methodology for large scale, distributed, parallel architecture, real-time systems (LDPARTS), as an alternative to those methods using rate or dead-line monotonic analysis. In our method the fundamental units of prioritization, work items, are domain specific objects with timing requirements (deadlines) found in user's specification. A work item consists of a collection of tasks of equal priority. Current scheduling theories are applied with artifact deadlines introduced by the designer whereas our method schedules work items to meet user's specification deadlines (sometimes called end-to-end deadlines). Our method supports these scheduling properties. Work item scheduling is based on domain specific importance instead of task level urgency and still meets as many user specification deadlines as can be met by scheduling tasks with respect to urgency. Second, the minimum (closest) on-line deadline that can be guaranteed for a work item of highest importance, scheduled at run time, is approximately the inverse of the throughput, measured in work items per second. Third, throughput is not degraded during overload and instead of resorting to task shedding during overload, the designer can specify which work items to shed. We prove these properties in a mathematical model.

Goforth, Andre; Howes, Norman R.; Wood, Jonathan D.; Barnes, Michael J.

1995-01-01

172

Practical real-time computing system for biomedical experiment interface.  

PubMed

Many biomedical experiments require a precisely timed real-time (RT) computer interface. Because commonly used desktop operating systems are inherently non-real-time, real-time laboratory computer systems are often based on outdated DOS software or expensive proprietary real-time operating systems. Here we discuss a real-time computing system, based on the free RT-LINUX operating system, which we have developed for adaptive pacing control in a clinical cardiac electrophysiology laboratory. This powerful, flexible, and inexpensive system demonstrates that RT-LINUX is well suited for real-time biomedical experiment interface. PMID:10199694

Christini, D J; Stein, K M; Markowitz, S M; Lerman, B B

1999-01-01

173

An overview of the Rialto real-time architecture  

Microsoft Academic Search

The goal of the Rialto project at Microsoft Research is to build a system architecture supporting coexisting independent real-time (and non-real-time) programs. Unlike traditional embedded-systems real-time environments, where timing and resource analysis among competing tasks can be done off-line, it is our goal to allow multiple independently authored real-time applications with varying timing and resource requirements to dynamically coexist and

Michael B. Jones; Daniel L. McCulley; Alessandro Forin; Paul J. Leach; Daniela Ro?u; Daniel L. Roberts

1996-01-01

174

Near real-time traffic routing  

NASA Technical Reports Server (NTRS)

A near real-time physical transportation network routing system comprising: a traffic simulation computing grid and a dynamic traffic routing service computing grid. The traffic simulator produces traffic network travel time predictions for a physical transportation network using a traffic simulation model and common input data. The physical transportation network is divided into a multiple sections. Each section has a primary zone and a buffer zone. The traffic simulation computing grid includes multiple of traffic simulation computing nodes. The common input data includes static network characteristics, an origin-destination data table, dynamic traffic information data and historical traffic data. The dynamic traffic routing service computing grid includes multiple dynamic traffic routing computing nodes and generates traffic route(s) using the traffic network travel time predictions.

Yang, Chaowei (Inventor); Cao, Ying (Inventor); Xie, Jibo (Inventor); Zhou, Bin (Inventor)

2012-01-01

175

Real Time Simulation of Power Grid Disruptions  

SciTech Connect

DOE-OE and DOE-SC workshops (Reference 1-3) identified the key power grid problem that requires insight addressable by the next generation of exascale computing is coupling of real-time data streams (1-2 TB per hour) as the streams are ingested to dynamic models. These models would then identify predicted disruptions in time (2-4 seconds) to trigger the smart grid s self healing functions. This project attempted to establish the feasibility of this approach and defined the scientific issues, and demonstrated example solutions to important smart grid simulation problems. These objectives were accomplished by 1) using the existing frequency recorders on the national grid to establish a representative and scalable real-time data stream; 2) invoking ORNL signature identification algorithms; 3) modeling dynamically a representative region of the Eastern interconnect using an institutional cluster, measuring the scalability and computational benchmarks for a national capability; and 4) constructing a prototype simulation for the system s concept of smart grid deployment. The delivered ORNL enduring capability included: 1) data processing and simulation metrics to design a national capability justifying exascale applications; 2) Software and intellectual property built around the example solutions; 3) demonstrated dynamic models to design few second self-healing.

Chinthavali, Supriya [ORNL; Dimitrovski, Aleksandar D [ORNL; Fernandez, Steven J [ORNL; Groer, Christopher S [ORNL; Nutaro, James J [ORNL; Olama, Mohammed M [ORNL; Omitaomu, Olufemi A [ORNL; Shankar, Mallikarjun [ORNL; Spafford, Kyle L [ORNL; Vacaliuc, Bogdan [ORNL

2012-11-01

176

Real-time applications of neural nets  

SciTech Connect

Producing, accelerating and colliding very high power, low emittance beams for long periods is a formidable problem in real-time control. As energy has grown exponentially in time so has the complexity of the machines and their control systems. Similar growth rates have occurred in many areas, e.g., improved integrated circuits have been paid for with comparable increases in complexity. However, in this case, reliability, capability and cost have improved due to reduced size, high production and increased integration which allow various kinds of feedback. In contrast, most large complex systems (LCS) are perceived to lack such possibilities because only one copy is made. Neural nets, as a metaphor for LCS, suggest ways to circumvent such limitations. It is argued that they are logically equivalent to multi-loop feedback/forward control of faulty systems. While complimentary to AI, they mesh nicely with characteristics desired for real-time systems. Such issues are considered, examples given and possibilities discussed. 21 refs., 6 figs.

Spencer, J.E.

1989-05-01

177

Real-time PCR in microfluidic devices  

NASA Astrophysics Data System (ADS)

A central method in a standard biochemical laboratory is represented by the polymerase chain reaction (PCR), therefore many attempts have been performed so far to implement this technique in lab-on-a-chip (LOC) devices. PCR is an ideal candidate for miniaturization because of a reduction of assay time and decreased costs for expensive bio-chemicals. In case of the "classical" PCR, detection is done by identification of DNA fragments electrophoretically separated in agarose gels. This method is meanwhile frequently replaced by the so-called Real-Time-PCR because here the exponential increase of amplificates can be observed directly by measurement of DNA interacting fluorescent dyes. Two main methods for on-chip PCRs are available: traditional "batch" PCR in chambers on a chip using thermal cycling, requiring about 30 minutes for a typical PCR protocol and continuous-flow PCR, where the liquid is guided over stationary temperature zones. In the latter case, the PCR protocol can be as fast as 5 minutes. In the presented work, a proof of concept is demonstrated for a real-time-detection of PCR products in microfluidic systems.

Becker, Holger; Hlawatsch, Nadine; Klemm, Richard; Moche, Christian; Hansen-Hagge, Thomas; Gärtner, Claudia

2014-03-01

178

Real-time software failure characterization  

NASA Technical Reports Server (NTRS)

A series of studies aimed at characterizing the fundamentals of the software failure process has been undertaken as part of a NASA project on the modeling of a real-time aerospace vehicle software reliability. An overview of these studies is provided, and the current study, an investigation of the reliability of aerospace vehicle guidance and control software, is examined. The study approach provides for the collection of life-cycle process data, and for the retention and evaluation of interim software life-cycle products.

Dunham, Janet R.; Finelli, George B.

1990-01-01

179

Systems Analyze Water Quality in Real Time  

NASA Technical Reports Server (NTRS)

A water analyzer developed under Small Business Innovation Research (SBIR) contracts with Kennedy Space Center now monitors treatment processes at water and wastewater facilities around the world. Originally designed to provide real-time detection of nutrient levels in hydroponic solutions for growing plants in space, the ChemScan analyzer, produced by ASA Analytics Inc., of Waukesha, Wisconsin, utilizes spectrometry and chemometric algorithms to automatically analyze multiple parameters in the water treatment process with little need for maintenance, calibration, or operator intervention. The company has experienced a compound annual growth rate of 40 percent over its 15-year history as a direct result of the technology's success.

2010-01-01

180

Real time reflectometer. [measurement of specular reflectance  

NASA Technical Reports Server (NTRS)

A real time reflectometer with the particular utility of measuring fairly rapid (transient) changes in the specular reflectance of a sample which is continuously exposed to a perturbing environment is described. A fixed radiation source, a fixed detector, a uniformly rotating sample wheel, and a uniformly rotating optical wheel protect against misalignment problems. The reflectometer operates by comparing the measurings of a reflected signal with that of a reference signal made within fractions of a second of one another. Reflectance is measured in the infrared, visible, and vacuum ultraviolet regions.

Zwiener, J. M. (inventor)

1977-01-01

181

Real-time failure control (SAFD)  

NASA Technical Reports Server (NTRS)

The Real Time Failure Control program involves development of a failure detection algorithm, referred as System for Failure and Anomaly Detection (SAFD), for the Space Shuttle Main Engine (SSME). This failure detection approach is signal-based and it entails monitoring SSME measurement signals based on predetermined and computed mean values and standard deviations. Twenty four engine measurements are included in the algorithm and provisions are made to add more parameters if needed. Six major sections of research are presented: (1) SAFD algorithm development; (2) SAFD simulations; (3) Digital Transient Model failure simulation; (4) closed-loop simulation; (5) SAFD current limitations; and (6) enhancements planned for.

Panossian, Hagop V.; Kemp, Victoria R.; Eckerling, Sherry J.

1990-01-01

182

Ionospheric Corrections via PIM and Real-Time Data  

E-print Network

We describe a method for removing ionospheric effects from single-frequency radio data a posteriori. This method is based on a theoretical climatological model developed by the USAF, which returns electron density as a function of position and time along the line of sight to the source. Together with a model of the earth's magnetic field, ionospheric delays and Faraday rotation values ensue. If contemoraneous ionospheric data -- GPS TEC observations or ionosonde profiles -- exist, they can be incorporated to update the modeled electron densities.

R. M. Campbell

1999-07-29

183

A tool for modeling concurrent real-time computation  

NASA Technical Reports Server (NTRS)

Real-time computation is a significant area of research in general, and in AI in particular. The complexity of practical real-time problems demands use of knowledge-based problem solving techniques while satisfying real-time performance constraints. Since the demands of a complex real-time problem cannot be predicted (owing to the dynamic nature of the environment) powerful dynamic resource control techniques are needed to monitor and control the performance. A real-time computation model for a real-time tool, an implementation of the QP-Net simulator on a Symbolics machine, and an implementation on a Butterfly multiprocessor machine are briefly described.

Sharma, D. D.; Huang, Shie-Rei; Bhatt, Rahul; Sridharan, N. S.

1990-01-01

184

Quantum theory of the inverse Faraday effect  

NASA Astrophysics Data System (ADS)

We provide a quantum theoretical description of the magnetic polarization induced by intense circularly polarized light in a material. Such effect—commonly referred to as the inverse Faraday effect—is treated using beyond-linear response theory, considering the applied electromagnetic field as external perturbation. An analytical time-dependent solution of the Liouville-von Neumann equation to second order is obtained for the density matrix and used to derive expressions for the optomagnetic polarization. Two distinct cases are treated, the long-time adiabatic limit of polarization imparted by continuous wave irradiation, and the full temporal shape of the transient magnetic polarization induced by a short laser pulse. We further derive expressions for the Verdet constants for the inverse, optomagnetic Faraday effect and for the conventional, magneto-optical Faraday effect and show that they are in general different. Additionally, we derive expressions for the Faraday and inverse Faraday effects within the Drude-Lorentz theory and demonstrate that their equality does not hold in general, but only for dissipationless media. As an example, we perform initial quantum mechanical calculations of the two Verdet constants for a hydrogenlike atom and we extract the trends. We observe that one reason for a large inverse Faraday effect in heavy atoms is the spatial extension of the wave functions rather than the spin-orbit interaction, which nonetheless contributes positively.

Battiato, M.; Barbalinardo, G.; Oppeneer, P. M.

2014-01-01

185

Terrestrial Real-Time Volcano Monitoring  

NASA Astrophysics Data System (ADS)

As volcano monitoring involves more and different sensors from seismic to GPS receivers, from video and thermal cameras to multi-parameter probes measuring temperature, ph values and humidity in the ground and the air, it becomes important to design real-time networks that integrate and leverage the multitude of available parameters. In order to do so some simple principles need to be observed: a) a common time base for all measurements, b) a packetized general data communication protocol for acquisition and distribution, c) an open and well documented interface to the data permitting standard and emerging innovative processing, and d) an intuitive visualization platform for scientists and civil defense personnel. Although mentioned as simple principles, the list above does not necessarily lead to obvious solutions or integrated systems, which is, however, required to take advantage of the available data. Only once the different data streams are put into context to each other in terms of time and location can a broader view be obtained and additional information extracted. The presentation is a summary of currently available technologies and how they can achieve the goal of an integrated real-time volcano monitoring system. A common time base are standard for seismic and GPS networks. In different projects we extended this to video feeds and time-lapse photography. Other probes have been integrated with vault interface enclosures (VIE) as used in the Transportable Array (TA) of the USArray. The VIE can accommodate the sensors employed in volcano monitoring. The TA has shown that Antelope is a versatile and robust middleware. It provides the required packetized general communication protocol that is independent from the actual physical communication link leaving the network design to adopt appropriate and possible hybrid solutions. This applies for the data acquisition and the data/information dissemination providing both a much needed collaboration platform, as well as, system hardening backup centers. Moreover, Antelope, as typical middleware, allows the scientist and software developer to focus on the specific purpose of their application by providing well defined input/output interfaces. This will spur the development of original and inventive real-time processing schemes in the realm of volcano monitoring. Whatever the underlying data and information engine is, it is only as good as the frontend. Such a frontend has to accommodate the dual purpose of putting data and information in a form that is conducive for scientist and the emergency responder. Current projects in Italy and Abu Dhabi with multiple display centers gave us insights into how difficult it is to develop a multipurpose situation room. Currently, we are experimenting with sophisticated emergency management software that ties strong-motion measurement, structural behavior, and loss estimation to a situation-driven response plan. Although different in content and timeline, this can be adapted for developing volcano eruptions. A final word on remote sensing data, e.g. infrared imaging from an airplane: If the data can be streamed, there is a way to time tag them and include them in the broader real-time process. At least, batch processing should be considered in order to improve the overall information status pre- or post-event.

Franke, M.

2013-12-01

186

Faraday rotation in graphene  

E-print Network

We study magneto--optical properties of monolayer graphene by means of quantum field theory methods in the framework of the Dirac model. We reveal a good agreement between the Dirac model and a recent experiment on giant Faraday rotation in cyclotron resonance. We also predict other regimes when the effects are well pronounced. The general dependence of the Faraday rotation and absorption on various parameters of samples is revealed both for suspended and epitaxial graphene.

I. V. Fialkovsky; D. V. Vassilevich

2012-11-29

187

Michael Faraday, media man.  

PubMed

Michael Faraday was an enthusiastic portrait collector, and he welcomed the invention of photography not only as a possible means of recording observations accurately, but also as a method for advertising science and its practitioners. This article (which is part of the Science in the Industrial Revolution series) shows that like many eminent scientists, Faraday took advantage of the burgeoning Victorian media industry by posing in various roles. PMID:16332391

Fara, Patricia

2006-03-01

188

Real-time airborne data management system  

NASA Astrophysics Data System (ADS)

ITT has developed and demonstrated a real-time airborne data management system that ingests, compresses, stores, and streams imagery and video data from sensors based on users' needs. The data management system was designed to be sensor agnostic, which was demonstrated when ITT quickly integrated several different cameras including an HD video camera, an IR video camera, and large framing cameras. The data is compressed in real-time using ITT's high-speed JPEG 2000 compression core and stored in the airborne unit. The data is then interactively served to users over downlink communication based on the users' requests. This system's capability was demonstrated in several test flights where data was collected from the sensors at 132 megapixels per second (1.5 gigabits per second), compressed, stored, and interactively served as regions of interest to multiple users over a 48 megabit/second communication link. This data management system is currently being incorporated into airborne systems for military and civil applications.

Pellechia, Matthew; Brower, Bernard; Lourette, Richard; Shuler, Roddy; Boland, John; Rajan, S. Danny

2009-05-01

189

Reconfigurable real-time distributed processing network  

NASA Astrophysics Data System (ADS)

This paper describes a novel real-time image and signal processing network, RONINTM, which facilitates the rapid design and deployment of systems providing advanced geospatial surveillance and situational awareness capability. RONINTM is a distributed software architecture consisting of multiple agents or nodes, which can be configured to implement a variety of state-of-the-art computer vision and signal processing algorithms. The nodes operate in an asynchronous fashion and can run on a variety of hardware platforms, thus providing a great deal of scalability and flexibility. Complex algorithmic configuration chains can be assembled using an intuitive graphical interface in a plug-and- play manner. RONINTM has been successfully exploited for a number of applications, ranging from remote event detection to complex multiple-camera real-time 3D object reconstruction. This paper describes the motivation behind the creation of the network, the core design features, and presents details of an example application. Finally, the on-going development of the network is discussed, which is focussed on dynamic network reconfiguration. This allows to the network to automatically adapt itself to node or communications failure by intelligently re-routing network communications and through adaptive resource management.

Page, S. F.; Seely, R. D.; Hickman, D.

2011-06-01

190

On Quantum Tunneling in Real Time  

E-print Network

A detailed real time description of quantum tunneling in the semiclassical limit is given, using complex classical trajectories. This picture connects naturally with the ideas of post-selection and weak measurement introduced by Aharonov and collaborators. I show that one can precisely identify the {\\it complex} classical trajectory which a post-selected tunneling particle has followed, and which dominates the path integral in the limit as Planck's constant $\\hbar$ tends to zero. Detailed analytical calculations are presented for tunneling in cubic and quartic potentials. For a long post-selected tunneling time, the imaginary part of the tunneling coordinate is found to achieve very large values just before the particle tunnels. I discuss how the real and imaginary parts of the particle's coordinate may, in principle, be independently measured using weak measurements. It would be very interesting to observe this effect, which would demonstrate the essential role of complex numbers in our closest possible classical description of reality. Extensions to quantum field theory and general relativity are briefly discussed.

Neil Turok

2014-04-30

191

Algorithm for real time flare detection .  

NASA Astrophysics Data System (ADS)

A real time flare searching system has been developed at the University of Tor Vergata. The system is comprised of a CMOS camera (C-CAM BCi5) which captures full disk H-alpha solar images and a detection algorithm. The system has been installed for test at the Solar Station of the Tor Vergata University. The algorithm detects in real time the onset of solar flares by analysing intensity variations in the images. The basic parameters for the definition of a flare onset (intensity gradient and threshold) are user-tunable. The algorithm has been developed in the National Instruments Labview environment. It is prepared for integration with different camera systems at different observatories, and possibily at the future EST (European Solar Telescope) and particularly at the AFDT (Auxiliary Full Disk Telescope) which will provide full disk images in three spectral bands, including H-alpha. The system has been active during the past year and a half at the Tor Vergata Solar Station. Due to the current solar minimum no flare activity was available and the algorithm is currently being tested on Solar H-alpha images taken at the Kanzelhoe Observatory.

Piazzesi, R.; Berrilli, F.; Del Moro, D.; Egidi, A.

192

Real-time animation of complex hairstyles.  

PubMed

True real-time animation of complex hairstyles on animated characters is the goal of this work, and the challenge is to build a mechanical model of the hairstyle which is sufficiently fast for real-time performance while preserving the particular behavior of the hair medium and maintaining sufficient versatility for simulating any kind of complex hairstyles. Rather than building a complex mechanical model directly related to the structure of the hair strands, we take advantage of a volume free-form deformation scheme. We detail the construction of an efficient lattice mechanical deformation model which represents the volume behavior of the hair strands. The lattice is deformed as a particle system using state-of-the-art numerical methods, and animates the hairs using quadratic B-Spline interpolation. The hairstyle reacts to the body skin through collisions with a metaball-based approximation. The model is highly scalable and allows hairstyles of any complexity to be simulated in any rendering context with the appropriate trade off between accuracy and computation speed, fitting the need of Level-of-Detail optimization schemes. PMID:16509373

Volino, Pascal; Magnenat-Thalmann, Nadia

2006-01-01

193

Real time analysis of tokamak discharge parameters  

NASA Astrophysics Data System (ADS)

The techniques used in implementing two applications of real time digital analysis of data from the DIII-D tokamak are described. These tasks, which are demanding in both the speed of data acquisition and the speed of computation, execute on hardware capable of acquiring 40 million data samples per second and executing 80 million floating point operations per second. In the first case, a feedback control algorithm executing at a 10 kHz cycle frequency is used to specify the current in the poloidal field coils in order to control the discharge shape. In the second, fast Fourier transforms of Mirnov probe data are used to find the amplitude and frequency of each of eight toroidal mode numbers as a function of time during the discharge. Data sampled continuously at 500 kHz are used to produce results at 2 ms intervals.

Ferron, J. R.; Strait, E. J.

1992-10-01

194

Real time analysis of tokamak discharge parameters  

NASA Astrophysics Data System (ADS)

The techniques used in implementing two applications of real time analysis of data from the DIII-D tokamak are described. These tasks, which are demanding in both the speed of data acquisition and the speed of computation, execute on hardware capable of acquiring 40 million data samples per second and executing 80 million floating point operations per second. In the first case, a feedback control algorithm executing at a 10 kHz cycle frequency is used to specify the current in the poloidal field coils in order to control the discharge shape. In the second, fast Fourier transforms of Mirnov probe data are used to find the amplitude and frequency of each of eight toroidal mode numbers as a function of time during the discharge. Data sampled continuously at 500 kHz are used to produce results at 2 msec intervals.

Ferron, J. R.; Strait, E. J.

1992-03-01

195

Identifying financial crises in real time  

NASA Astrophysics Data System (ADS)

Following the thermodynamic formulation of a multifractal measure that was shown to enable the detection of large fluctuations at an early stage, here we propose a new index which permits us to distinguish events like financial crises in real time. We calculate the partition function from which we can obtain thermodynamic quantities analogous to the free energy and specific heat. The index is defined as the normalized energy variation and it can be used to study the behavior of stochastic time series, such as financial market daily data. Famous financial market crashes-Black Thursday (1929), Black Monday (1987) and the subprime crisis (2008)-are identified with clear and robust results. The method is also applied to the market fluctuations of 2011. From these results it appears as if the apparent crisis of 2011 is of a different nature to the other three. We also show that the analysis has forecasting capabilities.

da Fonseca, Eder Lucio; Ferreira, Fernando F.; Muruganandam, Paulsamy; Cerdeira, Hilda A.

2013-03-01

196

Algorithms for real-time flutter identification  

NASA Technical Reports Server (NTRS)

The work reported here addresses the important algorithm issues necessary to achieve a real-time flutter monitoring system; namely, the guidelines for choosing appropriate model forms, reduction of the parameter convergence transient, handling multiple modes, the effect of overparameterization, and estimate accuracy predictions, both online and for experiment design. An approach for efficiently computing continuous-time flutter parameter Cramer-Rao estimate error bounds has been developed. This enables a convincing comparison of theoretical and simulation results, as well as off-line studies in preparation for a flight test. Theoretical predictions, simulation and flight test results from the NASA/Dryden Drones for Aerodynamic and Structural Test (DAST) Program are compared.

Walker, R. A.; Gupta, N. K.; Gilyard, G. B.

1983-01-01

197

Real-time RTPCR for identification of differentially  

E-print Network

techniques #12;Steps in real-time PCR · RNA isolation and characterization · cDNA synthesis · Real-time PCR curve for genomic DNA Ct versus log y0 #12;Schizophrenia study Castensson et al. Biological Psychiatry

Sundberg, Rolf

198

Ames Lab 101: Real-Time 3D Imaging  

ScienceCinema

Ames Laboratory scientist Song Zhang explains his real-time 3-D imaging technology. The technique can be used to create high-resolution, real-time, precise, 3-D images for use in healthcare, security, and entertainment applications.

Zhang, Song

2012-08-29

199

Ames Lab 101: Real-Time 3D Imaging  

SciTech Connect

Ames Laboratory scientist Song Zhang explains his real-time 3-D imaging technology. The technique can be used to create high-resolution, real-time, precise, 3-D images for use in healthcare, security, and entertainment applications.

Zhang, Song

2010-01-01

200

Real Time Speed Estimation from Monocular Video  

NASA Astrophysics Data System (ADS)

In this paper, detailed studies have been performed for developing a real time system to be used for surveillance of the traffic flow by using monocular video cameras to find speeds of the vehicles for secure travelling are presented. We assume that the studied road segment is planar and straight, the camera is tilted downward a bridge and the length of one line segment in the image is known. In order to estimate the speed of a moving vehicle from a video camera, rectification of video images is performed to eliminate the perspective effects and then the interest region namely the ROI is determined for tracking the vehicles. Velocity vectors of a sufficient number of reference points are identified on the image of the vehicle from each video frame. For this purpose sufficient number of points from the vehicle is selected, and these points must be accurately tracked on at least two successive video frames. In the second step, by using the displacement vectors of the tracked points and passed time, the velocity vectors of those points are computed. Computed velocity vectors are defined in the video image coordinate system and displacement vectors are measured by the means of pixel units. Then the magnitudes of the computed vectors in the image space are transformed to the object space to find the absolute values of these magnitudes. The accuracy of the estimated speed is approximately ±1 - 2 km/h. In order to solve the real time speed estimation problem, the authors have written a software system in C++ programming language. This software system has been used for all of the computations and test applications.

Temiz, M. S.; Kulur, S.; Dogan, S.

2012-07-01

201

Real-Time Visualization of Joint Cavitation  

PubMed Central

Cracking sounds emitted from human synovial joints have been attributed historically to the sudden collapse of a cavitation bubble formed as articular surfaces are separated. Unfortunately, bubble collapse as the source of joint cracking is inconsistent with many physical phenomena that define the joint cracking phenomenon. Here we present direct evidence from real-time magnetic resonance imaging that the mechanism of joint cracking is related to cavity formation rather than bubble collapse. In this study, ten metacarpophalangeal joints were studied by inserting the finger of interest into a flexible tube tightened around a length of cable used to provide long-axis traction. Before and after traction, static 3D T1-weighted magnetic resonance images were acquired. During traction, rapid cine magnetic resonance images were obtained from the joint midline at a rate of 3.2 frames per second until the cracking event occurred. As traction forces increased, real-time cine magnetic resonance imaging demonstrated rapid cavity inception at the time of joint separation and sound production after which the resulting cavity remained visible. Our results offer direct experimental evidence that joint cracking is associated with cavity inception rather than collapse of a pre-existing bubble. These observations are consistent with tribonucleation, a known process where opposing surfaces resist separation until a critical point where they then separate rapidly creating sustained gas cavities. Observed previously in vitro, this is the first in-vivo macroscopic demonstration of tribonucleation and as such, provides a new theoretical framework to investigate health outcomes associated with joint cracking. PMID:25875374

Rowe, Lindsay

2015-01-01

202

Fine real-time processing in distributed systems  

Microsoft Academic Search

A simple communication mechanism for real-time operating systems is proposed to support communicating real-time processes in distributed systems. To extract the primitive requirements for a communication mechanism, communicating real-time processes are classified and discussed. Then a communication mechanism is designed to meet these requirements. The proposed mechanism handles communication messages with interrupt-level priority cooperatively with the real-time scheduler which are

Takahiro Yakoh; H. Sato; Tojiro Aoyama

2000-01-01

203

Real-time data access layer for MDSplus  

Microsoft Academic Search

Recent extensions to MDSplus allow data handling in long discharges and provide a real-time data access and communication layer. The real-time data access layer is an additional component of MDSplus: it is possible to use the traditional MDSplus API during normal operation, and to select a subset of data items to be used in real time. Real-time notification is provided

G. Manduchi; A. Luchetta; C. Taliercio; T. Fredian; J. Stillerman

2008-01-01

204

Real-time communication for distributed plasma control systems  

Microsoft Academic Search

Real-time control applications will benefit in the near future from the enhanced performance provided by multi-core processor architectures. Nevertheless real-time communication will continue to be critical in distributed plasma control systems where the plant under control typically is distributed over a wide area. At RFX-mod real-time communication is crucial for hard real-time plasma control, due to the distributed architecture of

A. Luchetta; A. Barbalace; G. Manduchi; A. Soppelsa; C. Taliercio

2008-01-01

205

UML for real-time device driver development  

Microsoft Academic Search

In today's embedded PC market the use of real-time systems is becoming more important everyday. Because of real time system's specific requirements it is a challenge to use standard object oriented notation for design and definition of real-time tasks. Problem of efficient hard real-time system development and use of standard object-oriented notation as a base for high availability solution is

H. Sertic; Fran Rus; Robert Rac

2003-01-01

206

A Real-Time Communication Method for Wormhole Switching Networks  

Microsoft Academic Search

In this paper, we propose a real-time communication scheme that can be used in general point-to-point real-time multicomputer systems with wormhole switching. Real-time communication should satisfy the two requirements of pre- dictability and priority handling. Since traditional worm- hole switching does not support priority handling, which is essential in real-time computing, flit-level preemption is adopted in our wormhole switching. Also,

Byungjae Kim; Jong Kim; Sung Je Hong; Sunggu Lee

1998-01-01

207

A real-time prediction of UTC  

NASA Technical Reports Server (NTRS)

The reference time scale for all scientific and technologic applications on the Earth, the Universal Coordinated Time (UTC), must be as stable, reliable, and accurate as possible. With this in view the BIPM and before it the BIH, have always calculated and then disseminated UTC with a delay of about 80 days. There are three fundamental reasons for doing this: (1) It takes some weeks for data, gathered from some 200 clocks spread world-wide, to be collected and for errors to be eliminated; (2) changes in clock rates can only be measured with high precision well after the fact; and (3) the measurement noise originating in time links, in particular using Loran-C, is smoothed out only when averaging over an extended period. Until mid-1992, the ultimate stability of UTC was reached at averaging times of about 100 days and corresponded to an Allan deviation sigma(sub y)(tau) of about 1,5x10(exp -14) then compared to the best primary clock in the world, the PTB CS2. For several years now, a predicted UTC has been computed by the USNO through an extrapolation of the values as published in deferred time by the BIPM. This is made available through the USNO Series 4, through the USNO Automated Data Service, and through GPS signals. Due to the instability of UTC, the poor predictability of the available clocks, and the intentional SA degradation of GPS signals, the real-time access to this extrapolated UTC has represented the true deferred-time UTC only to within several hundreds of nanoseconds.

Thomas, Claudine; Allan, David W.

1994-01-01

208

Satellite clock corrections estimation to accomplish real time ppp: experiments for brazilian real time network  

NASA Astrophysics Data System (ADS)

The real time PPP method requires the availability of real time precise orbits and satellites clocks corrections. Currently, it is possible to apply the solutions of clocks and orbits available by BKG within the context of IGS Pilot project or by using the operational predicted IGU ephemeris. The accuracy of the satellite position available in the IGU is enough for several applications requiring good quality. However, the satellites clocks corrections do not provide enough accuracy (3 ns ~ 0.9 m) to accomplish real time PPP with the same level of accuracy. Therefore, for real time PPP application it is necessary to further research and develop appropriated methodologies for estimating the satellite clock corrections in real time with better accuracy. Currently, it is possible to apply the real time solutions of clocks and orbits available by Federal Agency for Cartography and Geodesy (BKG) within the context of IGS Pilot project. The BKG corrections are disseminated by a new proposed format of the RTCM 3.x and can be applied in the broadcasted orbits and clocks. Some investigations have been proposed for the estimation of the satellite clock corrections using GNSS code and phase observable at the double difference level between satellites and epochs (MERVAT, DOUSA, 2007). Another possibility consists of applying a Kalman Filter in the PPP network mode (HAUSCHILD, 2010) and it is also possible the integration of both methods, using network PPP and observables at double difference level in specific time intervals (ZHANG; LI; GUO, 2010). For this work the methodology adopted consists in the estimation of the satellite clock corrections based on the data adjustment in the PPP mode, but for a network of GNSS stations. The clock solution can be solved by using two types of observables: code smoothed by carrier phase or undifferenced code together with carrier phase. In the former, we estimate receiver clock error; satellite clock correction and troposphere, considering that the phase ambiguities are eliminated when applying differences between consecutive epochs. However, when using undifferenced code and phase, the ambiguities may be estimated together with receiver clock errors, satellite clock corrections and troposphere parameters. In both strategies it is also possible to correct the troposphere delay from a Numerical Weather Forecast Model instead of estimating it. The prediction of the satellite clock correction can be performed using a straight line or a second degree polynomial using the time series of the estimated satellites clocks. To estimate satellite clock correction and to accomplish real time PPP two pieces of software have been developed, respectively, "RT_PPP" and "RT_SAT_CLOCK". The system (RT_PPP) is able to process GNSS code and phase data using precise ephemeris and precise satellites clocks corrections together with several corrections required for PPP. In the software RT_SAT_CLOCK we apply a Kalman filter algorithm to estimate satellite clock correction in the network PPP mode. In this case, all PPP corrections must be applied for each station. The experiments were generated in real time and post-processed mode (simulating real time) considering data from the Brazilian continuous GPS network and also from the IGS network in a global satellite clock solution. We have used IGU ephemeris for satellite position and estimated the satellite clock corrections, performing the updates as soon as new ephemeris files were available. Experiments were accomplished in order to assess the accuracy of the estimated clocks when using the Brazilian Numerical Weather Forecast Model (BNWFM) from CPTEC/INPE and also using the ZTD from European Centre for Medium-Range Weather Forecasts (ECMWF) together with Vienna Mapping Function VMF or estimating troposphere with clocks and ambiguities in the Kalman Filter. The daily precision of the estimated satellite clock corrections reached the order of 0.15 nanoseconds. The clocks were applied in the Real Time PPP for Brazilian network stations and also for fligh

Marques, Haroldo; Monico, João; Aquino, Marcio; Melo, Weyller

2014-05-01

209

Real-time support for high performance aircraft operation  

NASA Technical Reports Server (NTRS)

The feasibility of real-time processing schemes using artificial neural networks (ANNs) is investigated. A rationale for digital neural nets is presented and a general processor architecture for control applications is illustrated. Research results on ANN structures for real-time applications are given. Research results on ANN algorithms for real-time control are also shown.

Vidal, Jacques J.

1989-01-01

210

Soft RealTime Scheduling on Performance Asymmetric Multicore Platforms #  

E-print Network

This paper discusses an approach for supporting soft real­ time periodic tasks in Linux on performance at a different performance level. We discuss deficiencies of Linux in supporting periodic real­time tasks Introduction In this paper, we discuss an approach for supporting soft real­time periodic tasks in Linux

Anderson, James

211

Linux-based Real Time Monitoring System of Mobile Robots  

Microsoft Academic Search

Real time monitoring is necessary for the dynamic obstacle avoidance and trajectory tracking of mobile robots. However there are several problems in implementing a real time operating system: (1) it is expensive to develop since a high license fee is required and (2) standards for the real-time systems are not well-established yet. For an educational system under these difficulties, a

SeungHo Cho; I. O. Lee; JangMyung Lee

2006-01-01

212

MDSPLUS REAL-TIME DATA ACCESS IN RTAI  

Microsoft Academic Search

The MDSplus package is widely used in nuclear Fusion research for data acquisition and management. Recent extensions of the system provide useful features for real- time applications, such as the possibility of locking selected data items in memory and real-time notification. The real-time extensions of MDSplus have been implemented as a set of C++ classes and can be easily ported

Corso Stati Uniti

213

Linux and Real-Time: Current Approaches and Future Opportunities  

E-print Network

Linux and Real-Time: Current Approaches and Future Opportunities Claudio Scordino, Student Member in using the Linux operating system in real-time systems, especially in control systems. The simple to support real-time applications in Linux. Moreover, we take a look at the expected trends, presenting what

Lipari, Giuseppe

214

Real Time 3D Laparoscopic Ultrasonography Edward D. Light1  

E-print Network

1 Real Time 3D Laparoscopic Ultrasonography Edward D. Light1 , Salim F. Idriss2 , Kathryn F laparoscopic ultrasonography (3D LUS), and real time 3D transesophageal echocardiography (TEE fibrillation. Key Words: Laparoscopic Ultrasonography, Real Time 3D Imaging, 2D Array Transducer, Trocar

Smith, Stephen

215

Real time railway traffic management modeling track-circuits  

E-print Network

Real time railway traffic management modeling track-circuits Paola Pellegrini, Grégory Marlière.rodriguez@ifsttar.fr Abstract The real time railway traffic management seeks for the train routing and scheduling that minimize. 1998 ACM Subject Classification G.1.6 Optimization Keywords and phrases real time railway traffic

Paris-Sud XI, Université de

216

Real-time snapshot hyperspectral imaging endoscope  

PubMed Central

Hyperspectral imaging has tremendous potential to detect important molecular biomarkers of early cancer based on their unique spectral signatures. Several drawbacks have limited its use for in vivo screening applications: most notably the poor temporal and spatial resolution, high expense, and low optical throughput of existing hyperspectral imagers. We present the development of a new real-time hyperspectral endoscope (called the image mapping spectroscopy endoscope) based on an image mapping technique capable of addressing these challenges. The parallel high throughput nature of this technique enables the device to operate at frame rates of 5.2 frames per second while collecting a (x, y, ?) datacube of 350 × 350 × 48. We have successfully imaged tissue in vivo, resolving a vasculature pattern of the lower lip while simultaneously detecting oxy-hemoglobin. PMID:21639573

Kester, Robert T.; Bedard, Noah; Gao, Liang; Tkaczyk, Tomasz S.

2011-01-01

217

A Measure of Real-Time Intelligence  

NASA Astrophysics Data System (ADS)

We propose a new measure of intelligence for general reinforcement learning agents, based on the notion that an agent's environment can change at any step of execution of the agent. That is, an agent is considered to be interacting with its environment in real-time. In this sense, the resulting intelligence measure is more general than the universal intelligence measure (Legg and Hutter, 2007) and the anytime universal intelligence test (Hernández-Orallo and Dowe, 2010). A major advantage of the measure is that an agent's computational complexity is factored into the measure in a natural manner. We show that there exist agents with intelligence arbitrarily close to the theoretical maximum, and that the intelligence of agents depends on their parallel processing capability. We thus believe that the measure can provide a better evaluation of agents and guidance for building practical agents with high intelligence.

Gavane, Vaibhav

2013-03-01

218

Real-time value-driven diagnosis  

NASA Technical Reports Server (NTRS)

Diagnosis is often thought of as an isolated task in theoretical reasoning (reasoning with the goal of updating our beliefs about the world). We present a decision-theoretic interpretation of diagnosis as a task in practical reasoning (reasoning with the goal of acting in the world), and sketch components of our approach to this task. These components include an abstract problem description, a decision-theoretic model of the basic task, a set of inference methods suitable for evaluating the decision representation in real-time, and a control architecture to provide the needed continuing coordination between the agent and its environment. A principal contribution of this work is the representation and inference methods we have developed, which extend previously available probabilistic inference methods and narrow, somewhat, the gap between probabilistic and logical models of diagnosis.

Dambrosio, Bruce

1995-01-01

219

Near real-time stereo vision system  

NASA Technical Reports Server (NTRS)

The apparatus for a near real-time stereo vision system for use with a robotic vehicle is described. The system is comprised of two cameras mounted on three-axis rotation platforms, image-processing boards, a CPU, and specialized stereo vision algorithms. Bandpass-filtered image pyramids are computed, stereo matching is performed by least-squares correlation, and confidence ranges are estimated by means of Bayes' theorem. In particular, Laplacian image pyramids are built and disparity maps are produced from the 60 x 64 level of the pyramids at rates of up to 2 seconds per image pair. The first autonomous cross-country robotic traverses (of up to 100 meters) have been achieved using the stereo vision system of the present invention with all computing done onboard the vehicle. The overall approach disclosed herein provides a unifying paradigm for practical domain-independent stereo ranging.

Anderson, Charles H. (inventor); Matthies, Larry H. (inventor)

1993-01-01

220

Real-Time Inspection Of Currency  

NASA Astrophysics Data System (ADS)

An automatic inspection machine, designed and manufactured by the Perkin-Elmer Corporation for the U.S. Bureau of Engraving and Printing, is capable of real-time inspection of currency at rates compatible with the output of modern high-speed printing presses. Inspection is accomplished by comparing test notes (in 32-per-sheet format) with reference notes stored in the memory of a digital computer. This paper describes the development of algorithms for detecting defective notes, one of the key problems solved during the development of the inspection system. Results achieved on an analytical model, used for predicting probability of false alarms and probability of detecting typically defective notes, are compared to those obtained by system simulation.

Blazek, Henry

1986-12-01

221

Filming protein fibrillogenesis in real time  

PubMed Central

Protein fibrillogenesis is a universal tool of nano-to-micro scale construction supporting different forms of biological function. Its exploitable potential in nanoscience and technology is substantial, but the direct observation of homogeneous fibre growth able to underpin a kinetic-based rationale for building customized nanostructures in situ is lacking. Here we introduce a kinetic model of de novo protein fibrillogenesis which we imaged at the nanoscale and in real time, filmed. The model helped to reveal that, in contrast to heterogeneous amyloid assemblies, homogeneous protein recruitment is principally characterized by uniform rates of cooperative growth at both ends of growing fibers, bi-directional growth, with lateral growth arrested at a post-seeding stage. The model provides a foundation for in situ engineering of sequence-prescribed fibrous architectures. PMID:25519825

Bella, Angelo; Shaw, Michael; Ray, Santanu; Ryadnov, Maxim G.

2014-01-01

222

Real time speech formant analyzer and display  

DOEpatents

A speech analyzer for interpretation of sound includes a sound input which converts the sound into a signal representing the sound. The signal is passed through a plurality of frequency pass filters to derive a plurality of frequency formants. These formants are converted to voltage signals by frequency-to-voltage converters and then are prepared for visual display in continuous real time. Parameters from the inputted sound are also derived and displayed. The display may then be interpreted by the user. The preferred embodiment includes a microprocessor which is interfaced with a television set for displaying of the sound formants. The microprocessor software enables the sound analyzer to present a variety of display modes for interpretive and therapeutic used by the user. 19 figs.

Holland, G.E.; Struve, W.S.; Homer, J.F.

1987-02-03

223

Real time speech formant analyzer and display  

DOEpatents

A speech analyzer for interpretation of sound includes a sound input which converts the sound into a signal representing the sound. The signal is passed through a plurality of frequency pass filters to derive a plurality of frequency formants. These formants are converted to voltage signals by frequency-to-voltage converters and then are prepared for visual display in continuous real time. Parameters from the inputted sound are also derived and displayed. The display may then be interpreted by the user. The preferred embodiment includes a microprocessor which is interfaced with a television set for displaying of the sound formants. The microprocessor software enables the sound analyzer to present a variety of display modes for interpretive and therapeutic used by the user.

Holland, George E. (Ames, IA); Struve, Walter S. (Ames, IA); Homer, John F. (Ames, IA)

1987-01-01

224

REAL TIME DATA FOR REMEDIATION ACTIVITIES [11505  

SciTech Connect

Health physicists from the CH2M HILL Plateau Remediation Company collaborated with Berkeley Nucleonics Corporation to modify the SAM 940 isotope identifier instrument to be used for nuclear waste remediation. These modifications coupled with existing capabilities of the SAM 940 have proven to be invaluable during remediation activities, reducing disposal costs by allowing swift remediation of targeted areas that have been identified as having isotopes of concern (IOC), and eliminating multiple visits to sites by declaring an excavation site clear of IOCs before demobilizing from the site. These advantages are enabled by accumulating spectral data for specific isotopes that is nearly 100 percent free of false positives, which are filtered out in 'real time.'

BROCK CT

2011-01-13

225

Near real-time stereo vision system  

NASA Astrophysics Data System (ADS)

The apparatus for a near real-time stereo vision system for use with a robotic vehicle is described. The system is comprised of two cameras mounted on three-axis rotation platforms, image-processing boards, a CPU, and specialized stereo vision algorithms. Bandpass-filtered image pyramids are computed, stereo matching is performed by least-squares correlation, and confidence ranges are estimated by means of Bayes' theorem. In particular, Laplacian image pyramids are built and disparity maps are produced from the 60 x 64 level of the pyramids at rates of up to 2 seconds per image pair. The first autonomous cross-country robotic traverses (of up to 100 meters) have been achieved using the stereo vision system of the present invention with all computing done onboard the vehicle. The overall approach disclosed herein provides a unifying paradigm for practical domain-independent stereo ranging.

Matthies, Larry H.; Anderson, Charles H.

1991-12-01

226

Filming protein fibrillogenesis in real time.  

PubMed

Protein fibrillogenesis is a universal tool of nano-to-micro scale construction supporting different forms of biological function. Its exploitable potential in nanoscience and technology is substantial, but the direct observation of homogeneous fibre growth able to underpin a kinetic-based rationale for building customized nanostructures in situ is lacking. Here we introduce a kinetic model of de novo protein fibrillogenesis which we imaged at the nanoscale and in real time, filmed. The model helped to reveal that, in contrast to heterogeneous amyloid assemblies, homogeneous protein recruitment is principally characterized by uniform rates of cooperative growth at both ends of growing fibers, bi-directional growth, with lateral growth arrested at a post-seeding stage. The model provides a foundation for in situ engineering of sequence-prescribed fibrous architectures. PMID:25519825

Bella, Angelo; Shaw, Michael; Ray, Santanu; Ryadnov, Maxim G

2014-01-01

227

Real-time slicing of data space  

SciTech Connect

Real-time rendering of iso-contour surfaces is problematic for large complex data sets. In this paper, an algorithm is presented that allows very rapid representation of an interval set surrounding a iso-contour surface. The algorithm draws upon three main ideas. A fast indexing scheme is used to select only those data points near the contour surface. Hardware assisted splatting is then employed on these data points to produce a volume rendering of the interval set. Finally, by shifting a small window through the indexing scheme or data space, animated volumes are produced showing the changing contour values. In addition to allowing fast selection and rendering of the data, the indexing scheme allows a much compressed representation of the data by eliminating ``noise`` data points.

Crawfis, R.A.

1996-07-01

228

In-line real time air monitor  

DOEpatents

An in-line gas monitor capable of accurate gas composition analysis in a continuous real time manner even under strong applied vacuum conditions operates by mixing an air sample with helium forming a sample gas in two complementary sample loops embedded in a manifold which includes two pairs of 3-way solenoid valves. The sample gas is then analyzed in an ion trap mass spectrometer on a continuous basis. Two valve drivers actuate the two pairs of 3-way valves in a reciprocating fashion, so that there is always flow through the in-line gas monitor via one or the other of the sample loops. The duty cycle for the two pairs of 3-way valves is varied by tuning the two valve drivers to a duty cycle typically between 0.2 to 0.7 seconds. 3 figs.

Wise, M.B.; Thompson, C.V.

1998-07-14

229

In-line real time air monitor  

DOEpatents

An in-line gas monitor capable of accurate gas composition analysis in a continuous real time manner even under strong applied vacuum conditions operates by mixing an air sample with helium forming a sample gas in two complementary sample loops embedded in a manifold which includes two pairs of 3-way solenoid valves. The sample gas is then analyzed in an ion trap mass spectrometer on a continuous basis. Two valve drivers actuate the two pairs of 3-way valves in a reciprocating fashion, so that there is always flow through the in-line gas monitor via one or the other of the sample loops. The duty cycle for the two pairs of 3-way valves is varied by tuning the two valve drivers to a duty cycle typically between 0.2 to 0.7 seconds.

Wise, Marcus B. (Kingston, TN); Thompson, Cyril V. (Knoxville, TN)

1998-01-01

230

Filming protein fibrillogenesis in real time  

NASA Astrophysics Data System (ADS)

Protein fibrillogenesis is a universal tool of nano-to-micro scale construction supporting different forms of biological function. Its exploitable potential in nanoscience and technology is substantial, but the direct observation of homogeneous fibre growth able to underpin a kinetic-based rationale for building customized nanostructures in situ is lacking. Here we introduce a kinetic model of de novo protein fibrillogenesis which we imaged at the nanoscale and in real time, filmed. The model helped to reveal that, in contrast to heterogeneous amyloid assemblies, homogeneous protein recruitment is principally characterized by uniform rates of cooperative growth at both ends of growing fibers, bi-directional growth, with lateral growth arrested at a post-seeding stage. The model provides a foundation for in situ engineering of sequence-prescribed fibrous architectures.

Bella, Angelo; Shaw, Michael; Ray, Santanu; Ryadnov, Maxim G.

2014-12-01

231

Real-time, face recognition technology  

SciTech Connect

The Institute for Scientific Computing Research (ISCR) at Lawrence Livermore National Laboratory recently developed the real-time, face recognition technology KEN. KEN uses novel imaging devices such as silicon retinas developed at Caltech or off-the-shelf CCD cameras to acquire images of a face and to compare them to a database of known faces in a robust fashion. The KEN-Online project makes that recognition technology accessible through the World Wide Web (WWW), an internet service that has recently seen explosive growth. A WWW client can submit face images, add them to the database of known faces and submit other pictures that the system tries to recognize. KEN-Online serves to evaluate the recognition technology and grow a large face database. KEN-Online includes the use of public domain tools such as mSQL for its name-database and perl scripts to assist the uploading of images.

Brady, S.

1995-11-01

232

Approaching near real-time biosensing: microfluidic microsphere based biosensor for real-time analyte detection.  

PubMed

In this study we describe a simple lab-on-a-chip (LOC) biosensor approach utilizing well mixed microfluidic device and a microsphere-based assay capable of performing near real-time diagnostics of clinically relevant analytes such cytokines and antibodies. We were able to overcome the adsorption kinetics reaction rate-limiting mechanism, which is diffusion-controlled in standard immunoassays, by introducing the microsphere-based assay into well-mixed yet simple microfluidic device with turbulent flow profiles in the reaction regions. The integrated microsphere-based LOC device performs dynamic detection of the analyte in minimal amount of biological specimen by continuously sampling micro-liter volumes of sample per minute to detect dynamic changes in target analyte concentration. Furthermore we developed a mathematical model for the well-mixed reaction to describe the near real time detection mechanism observed in the developed LOC method. To demonstrate the specificity and sensitivity of the developed real time monitoring LOC approach, we applied the device for clinically relevant analytes: Tumor Necrosis Factor (TNF)-? cytokine and its clinically used inhibitor, anti-TNF-? antibody. Based on the reported results herein, the developed LOC device provides continuous sensitive and specific near real-time monitoring method for analytes such as cytokines and antibodies, reduces reagent volumes by nearly three orders of magnitude as well as eliminates the washing steps required by standard immunoassays. PMID:25497985

Cohen, Noa; Sabhachandani, Pooja; Golberg, Alexander; Konry, Tania

2015-04-15

233

Joint Opportunities for Real-Time Linux and Real-Time Systems Research  

Microsoft Academic Search

Based on lessons learned in developing and maintaining LITMUSRT, arguments in favor of an intensified collab- oration between the academic and the open-source real-time communities are presented, and several ways in which ongoing efforts in these two communities may benefit each other are outlined. Some (unfortunately) commonly- encountered sources of friction and mutual misconceptions, which result from differing backgrounds and

B. Brandenburg; James H. Anderson

234

Public Science with Real-Time Experiments  

NASA Astrophysics Data System (ADS)

One of the best ways for professional scientists to engage in public outreach is to get outside of the university and/or lab walls and go out into the public. That is, go to public spaces to do some science experiments with the public - this includes students of all ages that constitute that public. Technological advance in portable measurement gear now allow one to do real, or near real, time experiments in outdoor, public spaces. We have been running a meta-experiment of this sort, aimed at the public display of science, for about a year now in Houston TX at the Lee and Joe Jamail Skatepark. The project goes under the title of Sk8Lab Houston and has introduced students of all ages to the power of scientific experimentation. We bring a portable science pack with us to the park. The pack has a range of wireless measurement gear that allow experiments to be done on the spot. Some of the experiments are designed by us but many are designed on by whoever suggests them to us that day. Over time the Sk8Lab scientists have built up a level of "trust" with the people who frequent the park (no one feels like we are gonna grade them at the park and they know that the learning is not on some regimented clock). This has broken down some learning walls and allowed for a more informal mode of exploration and a more genuine mode of experimentation (as compared to what often happens in class labs when students feel like they are just being forced to reproduce some known result). We will describe some of the test case experiments we have run and also discuss some of the trials, tribulations, and happy successes (many unplanned) along the way.

Lenardic, A.

2013-12-01

235

Real-time rainfall estimation and prediction  

NASA Astrophysics Data System (ADS)

In this study the two problems of rainfall estimation and forecasting using data from weather radars and rain-gauges are studied. A GIS multi-component interface is developed for the analysis of weather radar precipitation data. This interface performs different operations, such as loading and redelivering radar and satellite data, projecting geographical features into the radar coordinate system, and overlaying data from multi-sensor into a common coordinate system. Additional features include accumulating radar rainfall depths, radar comparison with rain-gauge data, animating storm evolution on top of geographical features, and tracking and forecasting rainfall fields. Accurate measurements of rainfall duration, timing, location, and intensity are important for different water resources applications. Weather radars can provide valuable information on the space-time variations of rainfall. However, there are uncertainties in the radar measurements of precipitation. Thus rain-gauges are used to calibrate Z-R relations, which are used to convert from radar reflectivity Z to rainfall rate R. Sampling errors cause differences between rainfall estimated by radar and that estimated by rain-gauges. These errors constitute a limitation for use of radar data for high resolution applications such as urban applications. A methodology is developed to address and correct the effects of these errors. The results prove that correction for these errors reduces the variation between the two sensors. In addition, given that the radar is properly calibrated, correction for sampling errors can provide temporally detailed radar rainfall fields that can be used for high resolution hydrological applications. The comparisons between two Canadian radars (King City and Exeter) show that there is good agreement between rainfall fields estimated by the two radars. The comparisons between radar rainfall intensities estimated by the two radars and the corresponding rain-gauge intensities show that the classical Z-R equation used by the National Canadian Radar Network is biased and can lead to serious underestimation of rainfall. An optimum Z-R relation is calibrated using surface rain-gauge data to be used for unbiased rainfall estimation by the two radars. A new radar-based model is developed for quantitative short-term forecasting of rainfall fields. The new model is called the AARS (Automated Adaptive Rainfall Simulator). The AARS model employs an optimization strategy for performing the cross-correlation analysis that reduces the run time significantly and makes the technique attractive for real-time applications. In addition, the model tracks and forecasts the changes in rainfall intensities in space and time and produces forecasted rainfall fields for the specified lead time. The AARS model employs the adaptive exponential smoothing algorithm for real-time parameters estimation. Performance comparisons between the AARS model and the Canadian short-term prediction model SHARP (Short-Term Automated Radar Prediction) show that the AARS is superior in terms of tracking run time and slightly better in terms of accuracy for forecasting lead times up to 30 minutes. The application of the AARS model for rainfall forecasting in Hamilton-Wentworth Region shows promising results for forecasting lead times less than 60 minutes.

Gad, Mohamed

2003-10-01

236

Integrating Multimedia Applications in Hard Real-Time Systems  

Microsoft Academic Search

This paper focuses on the problem of providing efficient run-time support to multimedia applications in a real-time system, where two types of tasks can coexist simultaneously: multimedia soft real-time tasks and hard real-time tasks. Hard tasks are guaranteed based on worst case execution times and minimum interarrival times, whereas multimedia and soft tasks are served based on mean parameters. The

Luca Abeni; Giorgio C. Buttazzo

1998-01-01

237

Enhancing the Real-Time Capability of the Linux Kernel  

Microsoft Academic Search

Linux has become one of the most popular UNIX operating systems. Commercial support for Linux and adoption of Linux in real world applications have now started to emerge. Some of the applications have strict real-time requirements. We discuss how to make Linux a real-time operating system. The real-time capability is achieved by three new kernel mechanisms. We port a microtimer

Yu-chung Wang; Kwei-jay Lin

1998-01-01

238

Monash University AUSTRALIA 1A Real Time DSP Sonar Echo Processor -IROS'2000 A Real Time DSP Sonar Echo  

E-print Network

Monash University AUSTRALIA 1A Real Time DSP Sonar Echo Processor - IROS'2000 A Real Time DSP Sonar of Electrical and Computer Systems Engineering Monash University, Victoria, AUSTRALIA www.ecse.monash.edu.au/centres/IRRC # Funded by an Australian Research Council Large Grant #12;Monash University AUSTRALIA 2A Real Time DSP

239

Analysis and benchmarking performance of Real Time Patch Linux and Xenomai in serving a real time application  

Microsoft Academic Search

Every Real Time Operating System (RTOS) has different characteristics. Testing is needed to determine which criteria of real time application is suitable to be implemented using an RTOS. In this research, benchmarking is performed on two Linux based RTOS; Real Time Patch Linux and Xenomai. Benchmarking is done by running encryption application on each RTOS. RTOS performance assessed through encryption

Mastura Diana Marieska; Achmad Imam Kistijantoro; Muhammad Subair

2011-01-01

240

Clinical experience with real-time ultrasound  

NASA Astrophysics Data System (ADS)

After testing the extended multimedia interface (EMMI) product which is an asynchronous transmission mode (ATM) user to network interface (UNI) of AT&T at the Society for Computer Applications in Radiology conference in Winston-Salem, the Department of Radiology together with AT&T are implementing a tele-ultrasound system to combine real- time ultrasound with the static imaging features of more traditional digital ultrasound systems. Our current ultrasound system archives digital images to an optical disk system. Static images are sent using our digital radiology systems. This could be transferring images from one digital imaging and communications (DICOM)-compliant machine to another, or the current image transfer methodologies. The prototype of a live ultrasound system using the EMMI demonstrated the feasibility of doing live ultrasound. We now are developing the scenarios using a mix of the two methodologies. Utilizing EMMI technology, radiologists at the BGSM review at a workstation both static images and real-time scanning done by a technologist on patients at a remote site in order to render on-line primary diagnosis. Our goal is to test the feasibility of operating an ultrasound laboratory at a remote site utilizing a trained technologist without the necessity of having a full-time radiologist at that site. Initial plans are for a radiologist to review an initial set of static images on a patient taken by the technologist. If further scanning is required, the EMMI is used to transmit real-time imaging and audio using the audio input of a standard microphone system and the National Television Standards Committee (NTSC) output of the ultrasound equipment from the remote site to the radiologist in the department review station. The EMMI digitally encodes this data and places it in an ATM format. This ATM data stream goes to the GCNS2000 and then to the other EMMI where the ATM data stream is decoded into the live studies and voice communication which are then received on a television and audio monitor. We also test live transmission of pediatric echocardiograms using the EMMI from a remote hospital to the Bowman Gray School of Medicine (BGSM) via a GCNS2000 ATM switch. This replaces the current method of having these studies transferred to a VHS tape and then mailed overnight to our pediatric cardiologist for review. This test should provide valuable insight into the staffing and operational requirements of a tele-ultrasound unit with pediatric echocardiogram capabilities. The EMMI thus provides a means for the radiologist to be in constant communication with the technologist to guide the scanning of areas in question and enable general problem solving. Live scans are sent from one EMMI at the remote site to the other EMMI at the review station in the radiology department via the GCNS2000 switch. This arrangement allows us to test the use of public ATM services for this application as this switch is a wide area, central office ATM switch. Static images are sent using the DICOM standard when available, otherwise the established institutional digital radiology methods are used.

Chimiak, William J.; Wolfman, Neil T.; Covitz, Wesley

1995-05-01

241

ARGO: Observing the Ocean in Real Time  

NSDL National Science Digital Library

Beginning September 19, 2000, an international collaboration of oceanographers from such institutes as Scripps Institution of Oceanography, the University of Washington, Institut fuer Meereskunde (Germany), Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO), and others are placing a global array of 3,000 floating instruments in the world's oceans. This project is called Argo, and its mission is to relay data on the salinity and temperature of the upper 2,000 meters of the ocean. According to the site, "Argo builds on the existing upper-ocean thermal networks, extending their spatial and temporal coverage, depth range and accuracy, and enhancing them through addition of salinity and velocity measurements. The name Argo is chosen to emphasize the strong complementary relationship of the global float array with the Jason altimeter mission. For the first time, the physical state of the upper ocean will be systematically measured and assimilated in near real-time." Visitors to the Argo site can see color schematics of the instrumentation layout, the probes, and maps of the array and present floats in the oceans. Documentation such as Argo scientific meeting reports, the design document, and an informational brochures can be downloaded in .pdf format, and a PowerPoint presentation with detailed color graphics is also available for download. Links to international oceanography programs and related news sites are provided as well.

242

Real-Time Principal-Component Analysis  

NASA Technical Reports Server (NTRS)

A recently written computer program implements dominant-element-based gradient descent and dynamic initial learning rate (DOGEDYN), which was described in Method of Real-Time Principal-Component Analysis (NPO-40034) NASA Tech Briefs, Vol. 29, No. 1 (January 2005), page 59. To recapitulate: DOGEDYN is a method of sequential principal-component analysis (PCA) suitable for such applications as data compression and extraction of features from sets of data. In DOGEDYN, input data are represented as a sequence of vectors acquired at sampling times. The learning algorithm in DOGEDYN involves sequential extraction of principal vectors by means of a gradient descent in which only the dominant element is used at each iteration. Each iteration includes updating of elements of a weight matrix by amounts proportional to a dynamic initial learning rate chosen to increase the rate of convergence by compensating for the energy lost through the previous extraction of principal components. In comparison with a prior method of gradient-descent-based sequential PCA, DOGEDYN involves less computation and offers a greater rate of learning convergence. The sequential DOGEDYN computations require less memory than would parallel computations for the same purpose. The DOGEDYN software can be executed on a personal computer.

Duong, Vu; Duong, Tuan

2005-01-01

243

Real-time optoacoustic monitoring of stroke  

NASA Astrophysics Data System (ADS)

Characterizing disease progression and identifying possible therapeutic interventions in stroke is greatly aided by the use of longitudinal function imaging studies. In this study, we investigate the applicability of real-time multispectral optoacoustic tomography (MSOT) as a tool for non-invasive monitoring of the progression of stroke in the whole brain. The middle cerebral artery occlusion (MCAO) method was used to induce stroke. Mice were imaged under isoflurane anesthesia preoperatively and at several time points during and after the 60-minute occlusion. The animals were sacrificed after 24 hours and their excised brains frozen at -80°C for sectioning. The cryosection were stained using H&E staining to identify the ischemic lesion. Major vessels are readily identifiable in the whole mouse head in the in vivo optoacoustic scans. During ischemia, a reduction in cerebral blood volume is detectable in the cortex. Post ischemia, spectral unmixing of the optoacoustic signals shows an asymmetry of the deoxygenated hemoglobin in the hemisphere affected by MCAO. This hypoxic area was mainly located around the boundary of the ischemic lesion and was therefore identified as the ischemic penumbra. Non-invasive functional MSOT imaging is able to visualize the hypoxic penumbra in brains affected by stroke. Stopping the spread of the infarct area and revitalizing the penumbra is central in stroke research, this new imaging technique may therefore prove to be a valuable tool in the monitoring and developing new treatments.

Kneipp, Moritz; Turner, Jake; Hambauer, Sebastian; Krieg, Sandro M.; Lehmberg, Jens; Lindauer, Ute; Razansky, Daniel

2014-03-01

244

Scheduling of real\\/non-real time services: adaptive EXP\\/PF algorithm  

Microsoft Academic Search

An efficient channel scheduler called the adaptive EXP\\/PF algorithm is proposed to provide real-time service with different QoS as well as a non-real time data services demanded by mobile users in an adaptive modulation and coding in time division multiplexing (AMC\\/TDM) systems. The adaptive EXP\\/PF algorithm guarantees transmission time delay bounds for real-time services as well as maximizes the system

Jong-Hun Rhee; J. M. Holtzman; Dong-Ku Kim

2003-01-01

245

Real-time fieldbus communications using Profibus networks  

Microsoft Academic Search

This paper provides a comprehensive study on how to use Profibus fieldbus networks to support real-time industrial communications, that is, on how to ensure the transmission of real-time messages within a maximum bound time. Profibus is base on a simplified timed token (TT) protocol, which is a well-proved solution for real-time communication systems. However, Profibus differs with respect to the

Eduardo Tovar; Francisco Vasques

1999-01-01

246

An Optimal Control Approach To Real-Time Vehicle Guidance  

E-print Network

to accurately track the setpoint trajectorie::; with a full motor vehicle dynamics model in real is used to link the EGC to the numerical real-time simulation of the full motor vehicle dynamics (Fig. 1 the full motor vehicle dynamics in real-time tai- lored models of the vehide dynamics and the road

Stryk, Oskar von

247

Following Michael Faraday's Footprints  

NASA Astrophysics Data System (ADS)

Last fall I had the good fortune of receiving financial support to shoot a documentary about Michael Faraday. I took the opportunity to learn more about this great experimentalist and to visit the highlights of places in his life. In this paper, I would like to share a list and description of some of the most remarkable places in London suitable for following Michael Faraday's footprints. There are many other places in Europe of special interest for the physics teacher,2,3 and some useful guides to help us visit places as "scientific travelers,"4,5 but this paper focuses on Michael Faraday and London. I have personally visited most of the places described below and found the experience to be really worthwhile.

Galeano, Javier

2011-01-01

248

An accurate and efficient algorithm for Faraday rotation corrections for spaceborne microwave radiometers  

NASA Astrophysics Data System (ADS)

Faraday rotation changes the polarization plane of linearly polarized microwaves which propagate through the ionosphere. To correct for ionospheric polarization error, it is necessary to have electron density profiles on a global scale that represent the ionosphere in real time. We use raytrace through the combined models of ionospheric conductivity and electron density (ICED), Bent, and Gallagher models (RIBG model) to specify the ionospheric conditions by ingesting the GPS data from observing stations that are as close as possible to the observation time and location of the space system for which the corrections are required. To accurately calculate Faraday rotation corrections, we also utilize the raytrace utility of the RIBG model instead of the normal shell model assumption for the ionosphere. We use WindSat data, which exhibits a wide range of orientations of the raypath and a high data rate of observations, to provide a realistic data set for analysis. The standard single-shell models at 350 and 400 km are studied along with a new three-shell model and compared with the raytrace method for computation time and accuracy. We have compared the Faraday results obtained with climatological (International Reference Ionosphere and RIBG) and physics-based (Global Assimilation of Ionospheric Measurements) ionospheric models. We also study the impact of limitations in the availability of GPS data on the accuracy of the Faraday rotation calculations.

Singh, Malkiat; Bettenhausen, Michael H.

2011-08-01

249

Real-Time Accumulative Computation Motion Detectors  

PubMed Central

The neurally inspired accumulative computation (AC) method and its application to motion detection have been introduced in the past years. This paper revisits the fact that many researchers have explored the relationship between neural networks and finite state machines. Indeed, finite state machines constitute the best characterized computational model, whereas artificial neural networks have become a very successful tool for modeling and problem solving. The article shows how to reach real-time performance after using a model described as a finite state machine. This paper introduces two steps towards that direction: (a) A simplification of the general AC method is performed by formally transforming it into a finite state machine. (b) A hardware implementation in FPGA of such a designed AC module, as well as an 8-AC motion detector, providing promising performance results. We also offer two case studies of the use of AC motion detectors in surveillance applications, namely infrared-based people segmentation and color-based people tracking, respectively. PMID:22303161

Fernández-Caballero, Antonio; López, María Teresa; Castillo, José Carlos; Maldonado-Bascón, Saturnino

2009-01-01

250

Architecture of the MAD real time computer  

NASA Astrophysics Data System (ADS)

The ESO-MAD (MCAO Technological Demonstrator) is a fast track project aimed at demonstrating the maturity of the Multi-Conjugate Adaptive Optics concept through a prototype MCAO instrument that uses only natural guide stars. This prototype features two different wavefront sensing architectures (Shack-Hartmann and Layer-Oriented), two deformable mirrors and one tip/tilt stage. One of the objectives of MAD is also to explore computing architectures different from the ones adopted so far. MAD-RTC is based on the latest generation general-purpose processors in a parallel architecture that can easily (even though not unexpensively) scale up to accomodate large or very large MCAO systems. MAD-RTC is a multi-wavefront-sensor multi-algorithm real time computer implemented in a Quad-G4 PPC computing board. It is designed to be a test-bed to study different solutions for the future MCAO systems: it can accept data from multiple CCDs in different configurations, use different reconstruction and control algorithms and drive multiple mirrors simultaneously.

Fedrigo, Enrico; Donaldson, Robert

2003-02-01

251

Real-time accumulative computation motion detectors.  

PubMed

The neurally inspired accumulative computation (AC) method and its application to motion detection have been introduced in the past years. This paper revisits the fact that many researchers have explored the relationship between neural networks and finite state machines. Indeed, finite state machines constitute the best characterized computational model, whereas artificial neural networks have become a very successful tool for modeling and problem solving. The article shows how to reach real-time performance after using a model described as a finite state machine. This paper introduces two steps towards that direction: (a) A simplification of the general AC method is performed by formally transforming it into a finite state machine. (b) A hardware implementation in FPGA of such a designed AC module, as well as an 8-AC motion detector, providing promising performance results. We also offer two case studies of the use of AC motion detectors in surveillance applications, namely infrared-based people segmentation and color-based people tracking, respectively. PMID:22303161

Fernández-Caballero, Antonio; López, María Teresa; Castillo, José Carlos; Maldonado-Bascón, Saturnino

2009-01-01

252

High sensitivity real-time NVR monitor  

NASA Technical Reports Server (NTRS)

A real time non-volatile residue (NVR) monitor, which utilizes surface acoustic wave (SAW) resonators to detect molecular contamination in a given environment. The SAW resonators operate at a resonant frequency of approximately 200 MHz-2,000 MHz which enables the NVR monitor to detect molecular contamination on the order of 10.sup.-11 g-cm.sup.-2 to 10.sup.-13 g-cm.sup.2. The NVR monitor utilizes active temperature control of (SAW) resonators to achieve a stable resonant frequency. The temperature control system of the NVR monitor is able to directly heat and cool the SAW resonators utilizing a thermoelectric element to maintain the resonators at a present temperature independent of the environmental conditions. In order to enable the direct heating and cooling of the SAW resonators, the SAW resonators are operatively mounted to a heat sink. In one embodiment, the heat sink is located in between the SAW resonators and an electronic circuit board which contains at least a portion of the SAW control electronics. The electrical leads of the SAW resonators are connected through the heat sink to the circuit board via an electronic path which prevents inaccurate frequency measurement.

Bowers, William D. (Inventor); Chuan, Raymond L. (Inventor)

1997-01-01

253

Towards real-time image quality assessment  

NASA Astrophysics Data System (ADS)

We introduce a real-time implementation and evaluation of a new fast accurate full reference based image quality metric. The popular general image quality metric known as the Structural Similarity Index Metric (SSIM) has been shown to be an effective, efficient and useful, finding many practical and theoretical applications. Recently the authors have proposed an enhanced version of the SSIM algorithm known as the Rotated Gaussian Discrimination Metric (RGDM). This approach uses a Gaussian-like discrimination function to evaluate local contrast and luminance. RGDM was inspired by an exploration of local statistical parameter variations in relation to variation of Mean Opinion Score (MOS) for a range of particular distortion types. In this paper we out-line the salient features of the derivation of RGDM and show how analyses of local statistics of distortion type necessitate variation in discrimination function width. Results on the LIVE image database show tight banding of RGDM metric value when plotted against mean opinion score indicating the usefulness of this metric. We then explore a number of strategies for algorithmic speed-up including the application of Integral Images for patch based computation optimisation, cost reduction for the evaluation of the discrimination function and general loop unrolling. We also employ fast Single Instruction Multiple Data (SIMD) intrinsics and explore data parallel decomposition on a multi-core Intel Processor.

Geary, Bobby; Grecos, Christos

2011-03-01

254

Real-Time Dosimetry for Radiobiology Experiments Using 25 MeV LINAC  

NASA Astrophysics Data System (ADS)

The next generation of radiobiology research requires increasingly more complex radiation sources to address questions ranging from the effects of space-based radiation to the influence of dose rate on biological systems. The Idaho Accelerator Center (IAC) has developed a radiobiology research facility to address some of these questions. The irradiation challenge is to deliver stable and reproducible conditions of high dose rate with well-controlled beam uniformity, dose, and dose rate under controlled temperature. In this work, we used a 25 MeV modified medical grade linear accelerator (LINAC) to obtain a high and adjustable electron dose rate. To overcome electron beam drift we used a collimator that both assisted the LINAC operator to steer the beam and ensured that regardless of beam drift, only the fixed collimated beam would irradiate the specimens. In addition, we utilized a beam flattener to keep the beam variation as low as 3% at 2.5 cm from the beam's center, and 1% variation between the simultaneously irradiated sample tubes. We also demonstrated that a segmented Faraday "cup" (FC) array provides a useful real-time beam scanning and monitoring system, and is promising for implementing real-time dosimetry and control.

Mestari, Mohammed A.; Wells, Douglas P.; DeVeaux, Linda C.; Hunt, Alan; Naeem, Syed F.

2009-03-01

255

PERTS: A Prototyping Environment for Real-Time Systems  

NASA Technical Reports Server (NTRS)

PERTS is a prototyping environment for real-time systems. It is being built incrementally and will contain basic building blocks of operating systems for time-critical applications, tools, and performance models for the analysis, evaluation and measurement of real-time systems and a simulation/emulation environment. It is designed to support the use and evaluation of new design approaches, experimentations with alternative system building blocks, and the analysis and performance profiling of prototype real-time systems.

Liu, Jane W. S.; Lin, Kwei-Jay; Liu, C. L.

1993-01-01

256

Application specific real-time microkernel in hardware  

Microsoft Academic Search

Real-time operating system kernels in embedded systems need to be configurable. Unfortunately many of today's commercial real-time kernels are monolithic. These optimized code packages are difficult to change and maintain. This is motivated mainly to achieve short response time and easy access of debugging information. To solve the drawbacks of the monolithic real-time kernels, the microkernel structure was introduced. The

Susanna Nordström; Lennart Lindh; Lars Johansson; Tobias Skoglund

2005-01-01

257

A Linux-based Real-Time Operating System  

Microsoft Academic Search

This work describes the design, implementation, and possible applications of Real-Time Linux --- a hard real-time version of the Linux operating system. In this system, a standard time-sharing OS and a real-time executive run on the same computer. Interrupt controller emulation is used to guarantee a low maximum interrupt latency independently of the base system. The use of a one-shot

Michael Barabanov

1997-01-01

258

Real-Time Fieldbus Communications Using Profibus Networks  

Microsoft Academic Search

This paper provides a comprehensive study on how to use Profibus fieldbus networksto support real-time industrial communications, that is, on how to ensure the transmission of real-timemessages within a maximum bound time. Profibus is based on a simplified Timed Token (TT) protocol,which is a well-proved solution for real-time communication systems. However, Profibus differs withrespect to the TT protocol, thus preventing

Eduardo Tovar

1998-01-01

259

Guaranteeing real-time message deadlines in PROFIBUS networks  

Microsoft Academic Search

This paper provides a comprehensive study on how to use Profibus networks to support real-time communications, that is, ensuring the transmission of the real-time messages before their deadlines. Profibus is based on a simplified Timed Token (TT) protocol, which is a well-proved solution for real-time communication systems. However, Profibus differences to the TT protocol prevent the application of the usual

Eduardo Tovar; Francisco Vasques

1998-01-01

260

Apparatus Characterizes Transient Voltages in Real Time  

NASA Technical Reports Server (NTRS)

The figure shows a prototype of a relatively inexpensive electronic monitoring apparatus that measures and records selected parameters of lightning-induced transient voltages on communication and power cables. The selected parameters, listed below, are those most relevant to the ability of lightning-induced transients to damage electronic equipment. This apparatus bridges a gap between some traditional transient-voltage recorders that record complete waveforms and other traditional transient-voltage recorders that record only peak values: By recording the most relevant parameters and only those parameters this apparatus yields more useful information than does a traditional peak-value (only) recorder while imposing much smaller data-storage and data-transmission burdens than does a traditional complete-waveform recorder. Also, relative to a complete-waveform recorder, this apparatus is more reliable and can be built at lower cost because it contains fewer electronic components. The transients generated by sources other than lightning tend to have frequency components well below 1 MHz. Most commercial transient recorders can detect and record such transients, but cannot respond rapidly enough for recording lightning-induced transient voltage peaks, which can rise from 10 to 90 percent of maximum amplitude in a fraction of a microsecond. Moreover, commercial transient recorders cannot rearm themselves rapidly enough to respond to the multiple transients that occur within milliseconds of each other on some lightning strikes. One transient recorder, designed for Kennedy Space Center earlier [ Fast Transient-Voltage Recorder (KSC- 11991), NASA Tech Briefs, Vol. 23, No. 10, page 6a (October 1999)], is capable of sampling transient voltages at peak values up to 50 V in four channels at a rate of 20 MHz. That recorder contains a trigger circuit that continuously compares the amplitudes of the signals on four channels to a preset triggering threshold. When a trigger signal is received, a volatile memory is filled with data for a total time of 200 ms. After the data are transferred to nonvolatile memory, the recorder rearms itself within 400 ms to enable recording of subsequent transients. Unfortunately, the recorded data must be retrieved through a serial communication link. Depending on the amount of data recorded, the memory can be filled before retrieval is completed. Although large amounts of data are recorded and retrieved, only a small part of the information (the selected parameters) is usually required. The present transient-voltage recorder provides the required information, without incurring the overhead associated with the recording, storage, and retrieval of complete transient-waveform data. In operation, this apparatus processes transient voltage waveforms in real time to extract and record the selected parameters. An analog-to-digital converter that operates at a speed of as much as 100 mega-samples per second is used to sample a transient waveform. A real-time comparator and peak detector are implemented by use of fast field-programmable gate arrays.

Medelius, Pedro

2005-01-01

261

Following Michael Faraday's Footprints  

Microsoft Academic Search

Last fall I had the good fortune of receiving financial support to shoot a documentary about Michael Faraday.1 I took the opportunity to learn more about this great experimentalist and to visit the highlights of places in his life. In this paper, I would like to share a list and description of some of the most remarkable places in London

Javier Galeano

2011-01-01

262

Following Michael Faraday's Footprints  

ERIC Educational Resources Information Center

Last fall I had the good fortune of receiving financial support to shoot a documentary about Michael Faraday. I took the opportunity to learn more about this great experimentalist and to visit the highlights of places in his life. In this paper, I would like to share a list and description of some of the most remarkable places in London suitable…

Galeano, Javier

2011-01-01

263

Faraday's law paradoxes  

Microsoft Academic Search

Some unusual circuits have been devised which appear to produce a flux change without generating a corresponding induced potential difference, thus violating Faraday's law. What has been generated is a large amount of controversy and this article shows the cause of the dispute and its resolution.

A. Nussbaum

1972-01-01

264

FARADAY ROTATION 1 Introduction  

E-print Network

of the polarization may change as the radio waves propagate through the interstellar medium. This effect is called) in the interstellar medium. 2 Derivation of Faraday Rotation Electromagnetic waves propagating through a medium 0 - 2 ) (8) Obviously, n+ > n-, so that the left-handed circularly polarized wave will travel

Boettcher, Markus

265

ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE  

E-print Network

ASSESSMENT AND REFINEMENT OF REAL- TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE (OTREC PHASE I) Final Report #12;#12;ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE (OTREC PHASE 1) 5. Report

Bertini, Robert L.

266

Fast Faraday Cup With High Bandwidth  

DOEpatents

A circuit card stripline Fast Faraday cup quantitatively measures the picosecond time structure of a charged particle beam. The stripline configuration maintains signal integrity, and stitching of the stripline increases the bandwidth. A calibration procedure ensures the measurement of the absolute charge and time structure of the charged particle beam.

Deibele, Craig E [Knoxville, TN

2006-03-14

267

Real-Time Feature Tracking Using Homography  

NASA Technical Reports Server (NTRS)

This software finds feature point correspondences in sequences of images. It is designed for feature matching in aerial imagery. Feature matching is a fundamental step in a number of important image processing operations: calibrating the cameras in a camera array, stabilizing images in aerial movies, geo-registration of images, and generating high-fidelity surface maps from aerial movies. The method uses a Shi-Tomasi corner detector and normalized cross-correlation. This process is likely to result in the production of some mismatches. The feature set is cleaned up using the assumption that there is a large planar patch visible in both images. At high altitude, this assumption is often reasonable. A mathematical transformation, called an homography, is developed that allows us to predict the position in image 2 of any point on the plane in image 1. Any feature pair that is inconsistent with the homography is thrown out. The output of the process is a set of feature pairs, and the homography. The algorithms in this innovation are well known, but the new implementation improves the process in several ways. It runs in real-time at 2 Hz on 64-megapixel imagery. The new Shi-Tomasi corner detector tries to produce the requested number of features by automatically adjusting the minimum distance between found features. The homography-finding code now uses an implementation of the RANSAC algorithm that adjusts the number of iterations automatically to achieve a pre-set probability of missing a set of inliers. The new interface allows the caller to pass in a set of predetermined points in one of the images. This allows the ability to track the same set of points through multiple frames.

Clouse, Daniel S.; Cheng, Yang; Ansar, Adnan I.; Trotz, David C.; Padgett, Curtis W.

2010-01-01

268

Real-time volumetric scintillation dosimetry  

NASA Astrophysics Data System (ADS)

The goal of this brief review is to review the current status of real-time 3D scintillation dosimetry and what has been done so far in this area. The basic concept is to use a large volume of a scintillator material (liquid or solid) to measure or image the dose distributions from external radiation therapy (RT) beams in three dimensions. In this configuration, the scintillator material fulfills the dual role of being the detector and the phantom material in which the measurements are being performed. In this case, dose perturbations caused by the introduction of a detector within a phantom will not be at issue. All the detector configurations that have been conceived to date used a Charge-Coupled Device (CCD) camera to measure the light produced within the scintillator. In order to accurately measure the scintillation light, one must correct for various optical artefacts that arise as the light propagates from the scintillating centers through the optical chain to the CCD chip. Quenching, defined in its simplest form as a nonlinear response to high-linear energy transfer (LET) charged particles, is one of the disadvantages when such systems are used to measure the absorbed dose from high-LET particles such protons. However, correction methods that restore the linear dose response through the whole proton range have been proven to be effective for both liquid and plastic scintillators. Volumetric scintillation dosimetry has the potential to provide fast, high-resolution and accurate 3D imaging of RT dose distributions. Further research is warranted to optimize the necessary image reconstruction methods and optical corrections needed to achieve its full potential.

Beddar, S.

2015-01-01

269

Real time monitoring of electroless nickel plating  

NASA Astrophysics Data System (ADS)

This work deals with the design and manufacturing of the heat and chemical resistant transducer case required for on-line immersion testing, experimental design, data acquisition and signal processing. Results are presented for several depositions with an accuracy of two ten-thousandths of an inch in coating thickness obtained. Monitoring the deposition rate of Electroless Nickel (EN) plating in-situ will provide measurement of the accurate dimensions of the component being plated, in real time. EN is used as for corrosion and wear protection for automotive an - Electroless Nickel (EN) plating is commonly used for corrosion and wear protection for automotive and aerospace components. It plates evenly and symmetrically, theoretically allowing the part to be plated to its final dimension. Currently the standard approach to monitoring the thickness of the deposited nickel is to remove the component from the plating bath and physically measure the part. This can lead to plating problems such as pitting, non-adhesion of the deposit and contamination of the plating solution. The goal of this research effort is to demonstrate that plating thickness can be rapidly and accurately measured using ultrasonic testing. Here a special housing is designed to allow immersion of the ultrasonic transducers directly into the plating bath. An FFT based signal processing algorithm was developed to resolve closely spaced echoes for precise thickness determination. The technique in this research effort was found to be capable of measuring plating thicknesses to within 0.0002 inches. It is expected that this approach will lead to cost savings in many EN plating operations.

Rains, Aaron E.; Kline, Ronald A.

2013-01-01

270

Easy and hard testbeds for real-time search algorithms  

SciTech Connect

Although researchers have studied which factors influence the behavior of traditional search algorithms, currently not much is known about how domain properties influence the performance of real-time search algorithms. In this paper we demonstrate, both theoretically and experimentally, that Eulerian state spaces (a super set of undirected state spaces) are very easy for some existing real-time search algorithms to solve: even real-time search algorithms that can be intractable, in general, are efficient for Eulerian state spaces. Because traditional real-time search testbeds (such as the eight puzzle and gridworlds) are Eulerian, they cannot be used to distinguish between efficient and inefficient real-time search algorithms. It follows that one has to use non-Eulerian domains to demonstrate the general superiority of a given algorithm. To this end, we present two classes of hard-to-search state spaces and demonstrate the performance of various real-time search algorithms on them.

Koenig, S.; Simmons, R.G. [Carnegie Mellon Univ., Pittsburgh, PA (United States)

1996-12-31

271

Estimating extragalactic Faraday rotation  

NASA Astrophysics Data System (ADS)

Observations of Faraday rotation for extragalactic sources probe magnetic fields both inside and outside the Milky Way. Building on our earlier estimate of the Galactic contribution, we set out to estimate the extragalactic contributions. We discuss the problems involved; in particular, we point out that taking the difference between the observed values and the Galactic foreground reconstruction is not a good estimate for the extragalactic contributions. We point out a degeneracy between the contributions to the observed values due to extragalactic magnetic fields and observational noise and comment on the dangers of over-interpreting an estimate without taking into account its uncertainty information. To overcome these difficulties, we develop an extended reconstruction algorithm based on the assumption that the observational uncertainties are accurately described for a subset of the data, which can overcome the degeneracy with the extragalactic contributions. We present a probabilistic derivation of the algorithm and demonstrate its performance using a simulation, yielding a high quality reconstruction of the Galactic Faraday rotation foreground, a precise estimate of the typical extragalactic contribution, and a well-defined probabilistic description of the extragalactic contribution for each data point. We then apply this reconstruction technique to a catalog of Faraday rotation observations for extragalactic sources. The analysis is done for several different scenarios, for which we consider the error bars of different subsets of the data to accurately describe the observational uncertainties. By comparing the results, we argue that a split that singles out only data near the Galactic poles is the most robust approach. We find that the dispersion of extragalactic contributions to observed Faraday depths is most likely lower than 7 rad/m2, in agreement with earlier results, and that the extragalactic contribution to an individual data point is poorly constrained by the data in most cases. Posterior samples for the extragalactic contribution to all data points and all results of our fiducial model are provided at http://www.mpa-garching.mpg.de/ift/faraday/

Oppermann, N.; Junklewitz, H.; Greiner, M.; Enßlin, T. A.; Akahori, T.; Carretti, E.; Gaensler, B. M.; Goobar, A.; Harvey-Smith, L.; Johnston-Hollitt, M.; Pratley, L.; Schnitzeler, D. H. F. M.; Stil, J. M.; Vacca, V.

2015-03-01

272

Implementing a General Real-Time Scheduling Framework in the RED-Linux Real-Time Kernel  

Microsoft Academic Search

Many scheduling paradigms have been studied for real- time applications and real-time communication network. Among them, the most commonly used paradigms include priority-driven, time-driven and share-driven paradigms. In this paper, we present a general scheduling framework which is designed to integrate these paradigms in one frame- work. The framework is implemented in our real-time extension of the Linux kernel, RED-Linux.

Yu-chung Wang; Kwei-jay Lin

1999-01-01

273

Real-Time Wireless Data Acquisition System  

NASA Technical Reports Server (NTRS)

Current and future aerospace requirements demand the creation of a new breed of sensing devices, with emphasis on reduced weight, power consumption, and physical size. This new generation of sensors must possess a high degree of intelligence to provide critical data efficiently and in real-time. Intelligence will include self-calibration, self-health assessment, and pre-processing of raw data at the sensor level. Most of these features are already incorporated in the Wireless Sensors Network (SensorNet(TradeMark)), developed by the Instrumentation Group at Kennedy Space Center (KSC). A system based on the SensorNet(TradeMark) architecture consists of data collection point(s) called Central Stations (CS) and intelligent sensors called Remote Stations (RS) where one or more CSs can be accommodated depending on the specific application. The CS's major function is to establish communications with the Remote Stations and to poll each RS for data and health information. The CS also collects, stores and distributes these data to the appropriate systems requiring the information. The system has the ability to perform point-to-point, multi-point and relay mode communications with an autonomous self-diagnosis of each communications link. Upon detection of a communication failure, the system automatically reconfigures to establish new communication paths. These communication paths are automatically and autonomously selected as the best paths by the system based on the existing operating environment. The data acquisition system currently under development at KSC consists of the SensorNet(TradeMark) wireless sensors as the remote stations and the central station called the Radio Frequency Health Node (RFHN). The RFF1N is the central station which remotely communicates with the SensorNet(TradeMark) sensors to control them and to receive data. The system's salient feature is the ability to provide deterministic sensor data with accurate time stamps for both time critical and non-time critical applications. Current wireless standards such as Zigbee(TradeMark) and Bluetooth(Registered TradeMark) do not have these capabilities and can not meet the needs that are provided by the SensorNet technology. Additionally, the system has the ability to automatically reconfigure the wireless communication link to a secondary frequency if interference is encountered and can autonomously search for a sensor that was perceived to be lost using the relay capabilities of the sensors and the secondary frequency. The RFHN and the SensorNet designs are based on modular architectures that allow for future increases in capability and the ability to expand or upgrade with relative ease. The RFHN and SensorNet sensors .can also perform data processing which forms a distributed processing architecture allowing the system to pass along information rather than just sending "raw data points" to the next higher level system. With a relatively small size, weight and power consumption, this system has the potential for both spacecraft and aircraft applications as well as ground applications that require time critical data.

Valencia, Emilio J.; Perotti, Jose; Lucena, Angel; Mata, Carlos

2007-01-01

274

Faraday and Cotton-Mouton Effects of Helium at = 1064 nm A. Cad`ene1  

E-print Network

Faraday and Cotton-Mouton Effects of Helium at = 1064 nm A. Cad`ene1 , D. Sordes1 , P. Berceau1 of the Faraday and the Cotton-Mouton effects of helium gas at = 1064 nm. Our apparatus is based on an up and Cotton-Mouton effect. Our measurements give for the first time the experimental value of the Faraday

Paris-Sud XI, Université de

275

Advancements in real-time engine simulation technology  

NASA Technical Reports Server (NTRS)

The approaches used to develop real-time engine simulations are reviewed. Both digital and hybrid (analog and digital) techniques are discussed and specific examples of each are cited. These approaches are assessed from the standpoint of their usefulness for digital engine control development. A number of NASA-sponsored simulation research activities, aimed at exploring real-time simulation techniques, are described. These include the development of a microcomputer-based, parallel processor system for real-time engine simulation.

Szuch, J. R.

1982-01-01

276

Real-Time Tsunami Forecasting: Challenges and Solutions  

Microsoft Academic Search

A new method for real-time tsunami forecasting will provide NOAA’s Tsunami Warning Centers with forecast guidance tools during an actual tsunami event. PMEL has developed the methodology of combining real-time data from tsunameters with numerical model estimates to provide site- and event-specific forecasts for tsunamis in real time. An overview of the technique and testing of this methodology is presented.

Vasily V. Titov; Frank I. Gonzalez; E. N. Bernard; Marie C. Eble; Harold O. Mofjeld; Jean C. Newman; Angie J. Venturato

2005-01-01

277

Scheduling Real-time Transactions: a Performance Evaluation  

Microsoft Academic Search

Ivfanaging transactions with real-time requirements presents many new problems. In this paper we focus on two: How can we schedule transactions with deadlines? How do the real-time constraints affect concurrency con- trol? We describe a new group of algorithms for scheduling real-time transactions which produce serialix- able schedules. We present a model for scheduling tmn- sactions with deadlines on a

Robert K. Abbott; Hector Garcia-molina

1988-01-01

278

Real-time and postprocessing holographic effects in dichromated pullulan  

NASA Astrophysics Data System (ADS)

Experimental results concerning both real-time and postprocessing (after-development) behavior of a novel photosensitive material, dichromate-sensitized pullulan (DCP), are investigated. The exposure mechanism and possibilities for controlling holographic grating properties are discussed. We have shown that it is possible to maximize the diffraction efficiency of interference gratings after development by controlling diffraction efficiency in real time. Stronger real-time effects of DCP compared with those of dichromated gelatin are achieved.

Savic, Svetlana; Pantelic, Dejan; Jakovijevic, Dragica

2002-08-01

279

Diverse Soft Real-Time Processing in an Integrated System  

Microsoft Academic Search

The simple notion of soft real-time processing has frac- tured into a spectrum of diverse soft real-time types with a variety of different resource and time constraints. Sched- ulers have been developed for each of these types, but these are essentially point solutions in the space of soft real-ti me and no single scheduler has previously been offered that can

Caixue Lin; Tim Kaldewey; Anna Povzner; Scott A. Brandt

2006-01-01

280

Feedback Control Real-Time Scheduling in ORB Middleware  

Microsoft Academic Search

Existing real-time ORB middleware standards such as RT-CORBA do not adequately address the challenges of 1) providing robust performance guaran- tees portably across different platforms, and 2) manag- ing unpredictable workload. To overcome this limita- tion, we have developed software called FCS\\/nORB that integrates a Feedback Control real-time Schedul- ing (FCS) service with the nORB small-footprint real- time ORB designed

Chenyang Lu; Xiaorui Wang; Christopher D. Gill

2003-01-01

281

Linux real-time framework for fusion devices  

Microsoft Academic Search

A new framework for the development and execution of real-time codes is currently being developed and commissioned at JET. The foundations of the system are Linux, the Real Time Application Interface (RTAI) and a wise exploitation of the new i386 multi-core processors technology.The driving motivation was the need to find a real-time operating system for the i386 platform able to

André Neto; Filippo Sartori; Fabio Piccolo; Antonio Barbalace; Riccardo Vitelli; Horácio Fernandes

2009-01-01

282

Measuring OS support for real-time CORBA ORBs  

Microsoft Academic Search

The paper compares and evaluates the suitability of real time operating systems, VxWorks and LynxOS, and general purpose operating systems with real time extensions, Windows NT, Solaris, and Linux, for real time ORB middleware. While holding the hardware and ORB constant, we vary these operating systems and measure platform-specific variations in context switching overhead and priority inversions. Our findings illustrate

David L. Levine; Sergio Flores-Gaitan; Christopher D. Gill; Douglas C. Schmidt

1999-01-01

283

An old-fashioned recipe for real time  

Microsoft Academic Search

Traditional methods for specifying and reasoning about concurrent systems work for real-time systems. Using TLA (the temporal logic of actions), we illustrate how they work with the examples of a queue and of a mutual-exclusion protocol. In general, two problems must be addressed: avoiding the real-time programming version of Zeno's paradox, and coping with circularities when composing real-time assumption\\/guarantee specifications.

Martín Abadi; Leslie Lamport

1994-01-01

284

RTP: A Transport Protocol for Real-Time Applications  

Microsoft Academic Search

This memorandum describes RTP, the real-time transport protocol. RTP provides end-to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. RTP does not address resource reservation and does not guarantee quality-of-service for real-time services. The data transport is augmented by a control protocol (RTCP) to allow monitoring

H. Schulzrinne; S. Casner; R. Frederick; V. Jacobson

2001-01-01

285

Real time density functional simulations of quantum scale conductance  

E-print Network

We study electronic conductance through single molecules by subjecting a molecular junction to a time dependent potential and propagating the electronic state in real time using time-dependent density functional theory ...

Evans, Jeremy Scott

2009-01-01

286

An Implementation Model of Real Time CORBA for Internet Applications  

Microsoft Academic Search

CORBA has developed rapidly and is being used in many fields of industry and commerce. But the growing use of distributed application with time sensitive requirements (such as distributed multimedia application) has created the need for a real time CORBA system. In this paper, an implementation model of a real time CORBA system has been proposed, which uses the integrated

Xie Junqing; Cai Min; Wang Yun

1999-01-01

287

Real-Time MENTAT programming language and architecture  

NASA Technical Reports Server (NTRS)

Real-time MENTAT, a programming environment designed to simplify the task of programming real-time applications in distributed and parallel environments, is described. It is based on the same data-driven computation model and object-oriented programming paradigm as MENTAT. It provides an easy-to-use mechanism to exploit parallelism, language constructs for the expression and enforcement of timing constraints, and run-time support for scheduling and exciting real-time programs. The real-time MENTAT programming language is an extended C++. The extensions are added to facilitate automatic detection of data flow and generation of data flow graphs, to express the timing constraints of individual granules of computation, and to provide scheduling directives for the runtime system. A high-level view of the real-time MENTAT system architecture and programming language constructs is provided.

Grimshaw, Andrew S.; Silberman, Ami; Liu, Jane W. S.

1989-01-01

288

Enhancing Real-Time CORBA Predictability and Performance  

Microsoft Academic Search

\\u000a Distributed real-time and embedded (DRE) applications possess stringent quality of service (QoS) requirements, such as low\\u000a latency, bounded jitter, and high throughput. An increasing number of DRE applications are developed using QoS-enabled middleware,\\u000a such as Real-time CORBA and the Real-time Specification for Java (RTSJ), to ensure predictable end-to-end QoS. Real-time CORBA\\u000a is an open middleware standard that allows DRE applications

Arvind S. Krishna; Douglas C. Schmidt; Krishna Raman; Raymond Klefstad

2003-01-01

289

Methods for real-time speech processing on Unix  

SciTech Connect

The author discusses computer programming done at the University of California, Berkeley, in support of research work in the area of speech analysis and synthesis. The purpose of this programming is to set up a system for doing real-time speech sampling using the Unix operating system. Two alternative approaches to real time work on Unix are discussed. The first approach is to do the real-time input/output on a secondary (satellite) machine that is not running Unix. The second approach is to do the real-time input/output on the main machine with the aid of special hardware.

Romberger, A.

1982-01-01

290

Scheduling of Real-Time Tasks with Complex Constraints  

Microsoft Academic Search

Real-time computer systems are characterized by the existence of timing constraints as well as logical correctness requirements\\u000a on computations they carry out. The timing constraints are statically determined prior to system operation time from the characteristics\\u000a of physical systems they interact with. In hard real-time systems, a timing failure is considered catastrophic and a guarantee should be given prior to

Seonho Choi; Ashok K. Agrawala

2000-01-01

291

17 CFR 43.3 - Method and timing for real-time public reporting.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Method and timing for real-time public reporting. 43.3 Section 43...COMMODITY FUTURES TRADING COMMISSION REAL-TIME PUBLIC REPORTING § 43.3 Method and timing for real-time public reporting. (a)...

2013-04-01

292

17 CFR 43.3 - Method and timing for real-time public reporting.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 false Method and timing for real-time public reporting. 43.3 Section 43...COMMODITY FUTURES TRADING COMMISSION REAL-TIME PUBLIC REPORTING § 43.3 Method and timing for real-time public reporting. (a)...

2012-04-01

293

Instrumentation development for real time brainwave monitoring.  

SciTech Connect

The human brain functions through a chemically-induced biological process which operates in a manner similar to electrical systems. The signal resulting from this biochemical process can actually be monitored and read using tools and having patterns similar to those found in electrical and electronics engineering. The primary signature of this electrical activity is the ''brain wave'', which looks remarkably similar to the output of many electrical systems. Likewise, the device currently used in medical arenas to read brain electrical activity is the electroencephalogram (EEG) which is synonymous with a multi-channel oscilloscope reading. Brain wave readings and recordings for medical purposes are traditionally taken in clinical settings such as hospitals, laboratories or diagnostic clinics. The signal is captured via externally applied scalp electrodes using semi-viscous gel to reduce impedance. The signal will be in the 10 to 100 microvolt range. In other instances, where surgeons are attempting to isolate particular types of minute brain signals, the electrodes may actually be temporarily implanted in the brain during a preliminary procedure. The current configurations of equipment required for EEGs involve large recording instruments, many electrodes, wires, and large amounts of hard disk space devoted to storing large files of brain wave data which are then eventually analyzed for patterns of concern. Advances in sensors, signal processing, data storage and microelectronics over the last decade would seem to have paved the way for the realization of devices capable of ''real time'' external monitoring, and possible assessment, of brain activity. A myriad of applications for such a capability are likewise presenting themselves, including the ability to assess brain functioning, level of functioning and malfunctioning. Our plan is to develop the sensors, signal processing, and portable instrumentation package which could capture, analyze, and communicate information on brain activity which could be of use to the individual, medical personnel or in other potential arenas. To take this option one step further, one might foresee that the signal would be captured, analyzed, and communicated to a person or device and which would result an action or reaction by that person or device. It is envisioned that ultimately a system would include a sensor detection mechanism, transmitter, receiver, microprocessor and associated memory, and audio and/or visual alert system. If successful in prototyping, the device could be considered for eventual implementation in ASIC form or as a fully integrated CMOS microsystem.

Anderson, Lawrence Frederick; Clough, Benjamin W.

2005-12-01

294

Real Time Wide Area Radiation Surveillance System  

NASA Astrophysics Data System (ADS)

We present the REWARD project, financed within the FP7 programme, theme SEC-2011.1.5-1 (Development of detection capabilities of difficult to detect radioactive sources and nuclear materials - Capability Project). Within this project, we propose a novel mobile system for real time, wide area radiation surveillance. The system is based on the integration of new miniaturized solid-state radiation sensors: a CdZnTe detector for gamma radiation and a high efficiency neutron detector based on novel silicon technologies. The sensing unit will include a wireless communication interface to send the data remotely to a monitoring base station which also uses a GPS system to calculate the position of the tag. The system will also incorporate middleware and high level software to provide web-service interfaces for the exchange of information, and that will offer top level functionalities as management of users, mobile tags and environment data and alarms, database storage and management and a web-based graphical user interface. Effort will be spent to ensure that the software is modular and re-usable across as many architectural levels as possible. Finally, an expert system will continuously analyze the information from the radiation sensor and correlate it with historical data from the tag location in order to generate an alarm when an abnormal situation is detected. The system will be useful for many different scenarios, including such lost radioactive sources and radioactive contamination. It will be possible to deploy in emergency units and in general in any type of mobile or static equipment. The sensing units will be highly portable thanks to their low size and low energy consumption. The complete system will be scalable in terms of complexity and cost and will offer very high precision on both the measurement and the location of the radiation. The modularity and flexibility of the system will allow for a realistic introduction to the market. Authorities may start with a basic, low cost system and increase the complexity of it based on the latest needs and also on the budget.

Biafore, M.

2012-04-01

295

Real-time Forensic Disaster Analysis  

NASA Astrophysics Data System (ADS)

The Center for Disaster Management and Risk Reduction Technology (CEDIM, www.cedim.de) - an interdisciplinary research center founded by the German Research Centre for Geoscience (GFZ) and Karlsruhe Institute of Technology (KIT) - has embarked on a new style of disaster research known as Forensic Disaster Analysis. The notion has been coined by the Integrated Research on Disaster Risk initiative (IRDR, www.irdrinternational.org) launched by ICSU in 2010. It has been defined as an approach to studying natural disasters that aims at uncovering the root causes of disasters through in-depth investigations that go beyond the reconnaissance reports and case studies typically conducted after disasters. In adopting this comprehensive understanding of disasters CEDIM adds a real-time component to the assessment and evaluation process. By comprehensive we mean that most if not all relevant aspects of disasters are considered and jointly analysed. This includes the impact (human, economy, and infrastructure), comparisons with recent historic events, social vulnerability, reconstruction and long-term impacts on livelihood issues. The forensic disaster analysis research mode is thus best characterized as "event-based research" through systematic investigation of critical issues arising after a disaster across various inter-related areas. The forensic approach requires (a) availability of global data bases regarding previous earthquake losses, socio-economic parameters, building stock information, etc.; (b) leveraging platforms such as the EERI clearing house, relief-web, and the many sources of local and international sources where information is organized; and (c) rapid access to critical information (e.g., crowd sourcing techniques) to improve our understanding of the complex dynamics of disasters. The main scientific questions being addressed are: What are critical factors that control loss of life, of infrastructure, and for economy? What are the critical interactions between hazard - socio-economic systems - technological systems? What were the protective measures and to what extent did they work? Can we predict pattern of losses and socio-economic implications for future extreme events from simple parameters: hazard parameters, historic evidence, socio-economic conditions? Can we predict implications for reconstruction from simple parameters: hazard parameters, historic evidence, socio-economic conditions? The M7.2 Van Earthquake (Eastern Turkey) of 23 Oct. 2011 serves as an example for a forensic approach.

Wenzel, F.; Daniell, J.; Khazai, B.; Mühr, B.; Kunz-Plapp, T.; Markus, M.; Vervaeck, A.

2012-04-01

296

FLARe: a Fault-tolerant Lightweight Adaptive Real-time middleware for distributed real-time and embedded systems  

Microsoft Academic Search

An important class of distributed real-time and embed- ded (DRE) applications consists predominantly of periodic soft real-time tasks. Timeliness and reliability are both e s- sential requirements for the correct operation of these ap- plications. Conventional solutions to these challenges te nd to use non-adaptive and load-agnostic fault tolerance solu - tions within a real-time system, which often end up

Jaiganesh Balasubramanian

2007-01-01

297

RT-EP: Real-Time Ethernet Protocol for Analyzable Distributed Applications on a Minimum Real-Time POSIX Kernel  

Microsoft Academic Search

This paper presents the design and implementation of RT- EP (Real-Time Ethernet Protocol), which is a software- based token-passing Ethernet protocol for multipoint com- munications in real-time applications, that does not require any modification to existing Ethernet hardware. This proto- col allows the designer to model and analyze the real-time application using it, because it is based on fixed priorities

José María Martínez; Michael González Harbour; J. Javier Gutiérrez

298

Real-time 3D model acquisition  

Microsoft Academic Search

The digitization of the 3D shape of real objects is a rapidly expanding field, with applications in entertainment, design, and archaeology. We propose a new 3D model acquisition system that permits the user to rotate an object by hand and see a continuously-updated model as the object is scanned. This tight feedback loop allows the user to find and fill

Szymon Rusinkiewicz; Olaf A. Hall-Holt; Marc Levoy

2002-01-01

299

Real-time Avatar Animation from a Single Image.  

PubMed

A real time facial puppetry system is presented. Compared with existing systems, the proposed method requires no special hardware, runs in real time (23 frames-per-second), and requires only a single image of the avatar and user. The user's facial expression is captured through a real-time 3D non-rigid tracking system. Expression transfer is achieved by combining a generic expression model with synthetically generated examples that better capture person specific characteristics. Performance of the system is evaluated on avatars of real people as well as masks and cartoon characters. PMID:24598812

Saragih, Jason M; Lucey, Simon; Cohn, Jeffrey F

2011-01-01

300

Real-time Avatar Animation from a Single Image  

PubMed Central

A real time facial puppetry system is presented. Compared with existing systems, the proposed method requires no special hardware, runs in real time (23 frames-per-second), and requires only a single image of the avatar and user. The user’s facial expression is captured through a real-time 3D non-rigid tracking system. Expression transfer is achieved by combining a generic expression model with synthetically generated examples that better capture person specific characteristics. Performance of the system is evaluated on avatars of real people as well as masks and cartoon characters. PMID:24598812

Saragih, Jason M.; Lucey, Simon; Cohn, Jeffrey F.

2014-01-01

301

Feedback Control Real-Time Scheduling: Framework, Modeling, and Algorithms  

Microsoft Academic Search

This paper presents a feedback control real-time scheduling (FCS) framework for adaptive real-timesystems. An advantage of the FCS framework is its use of feedback control theory (rather than ad hoc solutions)as a scientific underpinning. We apply a control theory based methodology to systematically design FCSalgorithms to satisfy the transient and steady state performance specifications of real-time systems. In particular,we establish

Chenyang Lu; John A. Stankovic; Sang Hyuk Son; Gang Tao

2002-01-01

302

Symbolic Model Checking for Real-time Systems  

Microsoft Academic Search

. We describe finite-state programs over real-numbered time in a guardedcommandlanguage with real-valued clocks or, equivalently, as finite automata withreal-valued clocks. Model checking answers the question which states of a real-timeprogram satisfy a branching-time specification (given in an extension of CTL with clockvariables). We develop an algorithm that computes this set of states symbolically as afixpoint of a functional on

Thomas A. Henzingert; Xavier Nicollin; Joseph Sifakis; Sergio Yovine

1992-01-01

303

Tractable Real-time Air Traffic Control Automation  

Microsoft Academic Search

A different paradigm is needed for real-time command and control (C&C) problems. Past approaches, using multiprocessors (MP), for real-time computing have had great difficulty in meeting real problem requirements. We review some reasons why C&C problems that require a solution on a MP architecture may be intractable, and then show an architecture where these reasons for intractability are non- existent.

Will C. Meilander; Mingxian Jin; Johnnie W. Baker

2002-01-01

304

Compensating for Interrupt Process Times in Real-Time Multimedia Systems  

E-print Network

of effort has been spent in pro- viding open source OSs such as Linux with real-time capabilities. One influence the performance of a real-time version of Linux. In particular, interrupts are mainly man- agedCompensating for Interrupt Process Times in Real-Time Multimedia Systems Luca Abeni and Giuseppe

Abeni, Luca

305

PDE based Video Compression in Real Time  

Microsoft Academic Search

Abstract We implement a video codec with a decompression scheme based on image inpainting using dierent,kinds of diusion,models. The arising PDEs are solved by an ecient,multigrid solver in case of linear homogeneous diusion,and by a multilevel scheme applying inexact lagged diusivity,in case of nonlinear isotropic and anisotropic diusion.,We consider real world and medical data sets, and show that it is

H. Kostler; M. Sturmer; Ch. Freundl; U. Rude

306

Distributed real time architecture for small biped robot YABIRO  

Microsoft Academic Search

In this paper, we present a real time architecture for embedded control systems to be used in a mobile biped robot called YABIRO. The robot has a total of 14 degrees of freedom (DOF). This number of joints enables YABIRO to produce many different gait configurations, and is also suitable to test and validate the proposed real time control architecture.

M. Albero; F. Blanes; G. Benet; P. Perez; J. E. Simo; J. Coronel

2005-01-01

307

Real-Time Seismology and Earthquake Damage Mitigation  

Microsoft Academic Search

Real-time seismology refers to a practice in which seismic data are collected and analyzed quickly after a significant seismic event, so that the results can be effectively used for postearthquake emergency response and early warning. As the technology of seismic instrumentation, telemetry, computers, and data storage facility advances, the real-time seismology for rapid postearthquake notification is essentially established. Research for

Hiroo Kanamori

2005-01-01

308

Efficient HVDC converter model for real time transients simulation  

Microsoft Academic Search

An efficient model has been developed to simulate high voltage direct current (HVDC) power converters in real-time transient simulators. Real time performance of 45 ?s per solution step has been achieved for a 12-pulse monopolar converter and 81 ?s for the bipolar converter using a single processor Pentium Pro 200 MHz desktop computer. The HVDC power converter model is solved

S. Acevedo; L. R. Linares; J. R. Marti; Y. Fujimoto

1999-01-01

309

Real-time 3-d Localization using Radar and Passive  

E-print Network

Real-time 3-d Localization using Radar and Passive Surface Acoustic Wave Transponders by Jason and Sciences #12;#12;Real-time 3-d Localization using Radar and Passive Surface Acoustic Wave Transponders of Science Abstract This thesis covers ongoing work into the design, fabrication, implementation

310

Coordinated System for Real Time Muscle Deformation during Locomotion  

E-print Network

Coordinated System for Real Time Muscle Deformation during Locomotion Sandra Baldassarri during human locomotion. We propose a two-layered motion model. The requirements of realism and real time element method (FEM). The FEM subsystem is fed by the torques and forces got from the locomotion system

Baldassarri, Sandra

311

Image Detection in real time based on Fuzzy Fractal theory  

E-print Network

Image Detection in real time based on Fuzzy Fractal theory Kya Abraham Berthe Yan Yan Soungalo China Abstract: Real time image detection is still a challenge in research. Several methods have been used, but all can be divide in two approaches: the first is based on image field estimation

Paris-Sud XI, Université de

312

Electromyostimulation and EMG real time device with muscle fatigue estimation  

E-print Network

Electromyostimulation and EMG real time device with muscle fatigue estimation Maxime Yochum, Toufik of an electromyostimulation (ES) and an electromyograph (EMG) modules which analyze in real time EMG during ES and proposes muscular fatigue index. Different methods to filter the EMG noise are then compared. The results show

Paris-Sud XI, Université de

313

Distributed scheduling for real-time railway traffic control  

Microsoft Academic Search

The increase of railway traffic efficiency and flex- ibility requires new real-time scheduling and control methods. New charter trains have to be added continuously without disturbing the other (periodic) train moves or decreasing the safety conditions. A distributed method to schedule new trains such that their real-time constraints are fulfilled is prese nted. The trains have timelines to meet and

Tiberiu Letia; Mihai Hulea; Radu Miron

2008-01-01

314

TOWARDS THE REAL-TIME USE OF QUIKSCAT WINDS  

E-print Network

1 TOWARDS THE REAL-TIME USE OF QUIKSCAT WINDS Ad Stoffelen, John de Vries, en Aart Voorrips #12;2 TOWARDS THE REAL-TIME USE OF QUIKSCAT WINDS Ad Stoffelen, John de Vries, en Aart Voorrips Ad weather, such as tropical cyclones. Recently, SeaWinds scatterometer measurements from QuikScat have

Stoffelen, Ad

315

Real-time neutron imaging of gas turbines  

NASA Astrophysics Data System (ADS)

The current status of real-time neutron radiography imaging is briefly reviewed, and results of tests carried out on cold neutron sources are reported. In particular, attention is given to demonstrations of neutron radiography on a running gas turbine engine. The future role of real-time neutron imaging in engineering diagnostics is briefly discussed.

Stewart, P. A. E.

1987-06-01

316

REAL-TIME MULTISPECTRAL IMAGING APPLICATION FOR POULTRY SAFETY INSPECTION  

Technology Transfer Automated Retrieval System (TEKTRAN)

Industrial-scale multispectral imaging system with real-time image processing software for on-line detection of poultry fecal and ingesta contaminants was developed. The software using Unified Modeling Language (UML) design approach was effective to develop real-time image processing software for o...

317

ON VISUAL REAL TIME MAPPING FOR UNMANNED AERIAL VEHICLES  

Microsoft Academic Search

This paper addresses the challenge of a real-time capable vision system in the task of trajectory and surface reconstruction by aerial image sequences. The goal is to present the design, methods and strategies of a real-time capable vision system solving the mapping task for secure navigation of small UAVs with a single camera. This includes the estimation process, map representation,

Richard Steffen

318

COMPUTER-CONTROLLED, REAL-TIME AUTOMOBILE EMISSIONS MONITORING SYSTEM  

EPA Science Inventory

A minicomputer controlled automotive emissions sampling and analysis system (the Real-Time System) was developed to determine vehicular modal emissions over various test cycles. This data acquisition system can sample real-time emissions at a rate of 10 samples/s. A buffer utiliz...

319

Fair Real-Time Traffic Scheduling over a Wireless LA  

Microsoft Academic Search

Unpredictable wireless channel errors may cause appli- cations with real-time traffic to receive degraded quality of services due to packet losses. In the presence of such errors, a challenging problem is how to schedule packets to achieve fairness among real-time flows and to maximize the over- all system throughput simultaneously. We capture fairness by minimizing the maximumdegradation in service over

Maria Adamou; Sanjeev Khanna; Insup Lee; Insik Shin; Shiyu Zhou

2001-01-01

320

Realistic, RealTime Rendering of Ocean Waves Microsoft Research  

E-print Network

Realistic, Real­Time Rendering of Ocean Waves Yaohua Hu Microsoft Research Luiz Velho IMPA Xin Tong surface in real time. Our system can render calm ocean waves with sophisticated lighting effects at 100 in recreating the look and feel of the ocean water. Our second idea is a view-dependent representation of wave

Rajamani, Sriram K.

321

Detection and quantification in real-time polymerase chain reaction  

E-print Network

Detection and quantification in real-time polymerase chain reaction Abou Keita1,2 , Romain H polymerase chain reaction (qPCR). Nevertheless, standard real-time pro- cedure do not address detection delay Context A sample of interest is taken from environment in order to be tested by Poly- merase Chain

Paris-Sud XI, Université de

322

Real-time fault diagnosis for propulsion systems  

NASA Technical Reports Server (NTRS)

Current research toward real time fault diagnosis for propulsion systems at NASA-Lewis is described. The research is being applied to both air breathing and rocket propulsion systems. Topics include fault detection methods including neural networks, system modeling, and real time implementations.

Merrill, Walter C.; Guo, Ten-Huei; Delaat, John C.; Duyar, Ahmet

1991-01-01

323

Real-time moving obstacle detection using optical flow models  

E-print Network

Real-time moving obstacle detection using optical flow models Christophe Braillon1, C-- In this paper, we propose a real-time method to detect obstacles using theoretical models of optical flow fields on optical flow and stereo camera to navigate urban environments with UAVs (Unmanned Aerial Vehicles

Paris-Sud XI, Université de

324

Real-Time Mass Passenger Transport Network Optimization Problems  

Microsoft Academic Search

The aim of the real-time mass transport vehicle routing problem (MTVRP) is to find a solution to route n vehicles in real time to pick up and deliver m passengers. This problem is described in the context of flexible large-scale mass transportation options that use new technologies for communication among passengers and vehicles. This study does not focus on the

Laia Pages; R. Jayakrishnan

2006-01-01

325

COMPOSITIONAL FRAMEWORK FOR REAL-TIME EMBEDDED SYSTEMS A DISSERTATION  

E-print Network

COMPOSITIONAL FRAMEWORK FOR REAL-TIME EMBEDDED SYSTEMS Insik Shin A DISSERTATION in Computer their pride in all my accomplish- ments. v #12;ABSTRACT COMPOSITIONAL FRAMEWORK FOR REAL-TIME EMBEDDED SYSTEMS Insik Shin Supervisor: Insup Lee An embedded system consists of a collection of components that interact

Plotkin, Joshua B.

326

Towards a Real-Time Cluster Computing Infrastructure  

SciTech Connect

Real-time computing has traditionally been considered largely in the context of single-processor and embedded systems, and indeed, the terms real-time computing, embedded systems, and control systems are often mentioned in closely related contexts. However, real-time computing in the context of multinode systems, specifically high-performance, cluster-computing systems, remains relatively unexplored, largely due to the fact that until now, there has not been a need for such an environment. In this paper, we motivate the need for a cluster computing infrastructure capable of supporting computation over large datasets in real-time. Our motivating example is an analytical framework to support the next generation North American power grid, which is growing both in size and complexity. With streaming sensor data in the future power grid potentially reaching rates on the order of terabytes per day, the task of analyzing this data subject to real-time guarantees becomes a daunting task which will require the power of high-performance cluster computing capable of functioning under real-time constraints. One specific challenge that such an environment presents is the need for real-time networked communication between cluster nodes. In this paper, we discuss the need for real-time high-performance cluster computation, along with our work-in-progress towards an infrastructure which will ultimately enable such an environment.

Hui, Peter SY; Chikkagoudar, Satish; Chavarría-Miranda, Daniel; Johnston, Mark R.

2011-11-01

327

ARCHITECTURE FOR A PORTABLE OPEN SOURCE REAL TIME KERNEL ENVIRONMENT  

E-print Network

source, integrated tools for developing embedded real-time ap- plications, especially targeted working on a version for ARM 7TDMI based boards. 1 Introduction This paper describes a project currently of an Open Source Real Time Kernel for embedded automotive applications. Developing a kernel

Lipari, Giuseppe

328

Soft Real-Time Scheduling on Performance Asymmetric Multicore Platforms  

Microsoft Academic Search

This paper discusses an approach for supporting soft real-time periodic tasks in Linux on performance asymmetric multicore platforms (AMPs). Such architectures consist of a large number of processing units on one or several chips, where each processing unit is capable of executing the same instruction set at a different performance level. We discuss deficiencies of Linux in supporting periodic real-time

John M. Calandrino; Dan P. Baumberger; Tong Li; Scott Hahn; James H. Anderson

2007-01-01

329

Implementation of Real-time Network Extension on Embedded Linux  

Microsoft Academic Search

Linux over the past few years has gained in popularity as the operating system for embedded networking equipment. Its reliability, low cost and undisputed networking capabilities made it one of the most popular choices for the networking devices. But traditional software network interfaces in Linux do not deliver satisfactory real-time performance. Hence alternative efficient real-time interfaces are required in network

Yuan Tian; Guoqiang Ren; Qinzhang Wu

2009-01-01

330

Real-time implementation of optimal reactive power flow  

Microsoft Academic Search

The application of optimal reactive power flow (ORPF) to the New Brunswick (NB) power system is presented. The potential benefits and the real-time implementation problems of ORPF are discussed. Some important issues of real-time implementation on ORPF, such as frequency of running, the number of activated control variables, and the order of adjustment of different controls, are discussed. The application

S. Salamat Sharif; James H. Taylor; Eugene F. Hill; Brian Scott; Dave Daley

2000-01-01

331

Real-time implementation of optimal reactive power flow  

Microsoft Academic Search

The application of optimal reactive power flow (ORPF) to the New Brunswick (NB) power system is presented. The potential benefits and the real-time implementation problems of ORPF are discussed. Some important issues on real-time implementation of ORPF such as frequency of running, the number of activated control variables, and the order of adjustment of different controls are discussed. The application

S. Salamat Sharifl; James H. Taylor

1999-01-01

332

The SPLENDORS Real Time Portfolio Management System (Extended Abstract)  

E-print Network

1 The SPLENDORS Real Time Portfolio Management System (Extended Abstract) * Tushar M. Patel Gail E philosophies. The resulting portfolio managers are then added to the SPLENDORS system, without the need­011­91 14 April 1991 Abstract SPLENDORS is a sample real time portfolio management application built

333

REAL-TIME ENVIRONMENTAL MONITORING: APPLICATIONS FOR HOMELAND SECURITY  

EPA Science Inventory

Real-time monitoring technology developed as part of the EMPACT program has a variety of potential applications. These tools can measure a variety of potential contaminants in the air, water, in buildings, or in the soil. Real-time monitoring technology allows these detection sys...

334

REAL-TIME RENDERING OF CUT DIAMONDS TECHNICAL REPORT  

E-print Network

REAL-TIME RENDERING OF CUT DIAMONDS TECHNICAL REPORT Department of Computer Science University Davis, CA 95616-8562 U.S.A. #12;Online ID 0459 Page 1 REAL-TIME RENDERING OF CUT DIAMONDS paper category-generated images of cut diamonds of convex polyhedral shape. The method is based on beam tracing and models

Hamann, Bernd

335

IPS Real-Time Space Weather Status Panel  

NSDL National Science Digital Library

The IPS (Ionospheric Prediction Service) Real-Time Space Weather Status Panel, an agency of the Australian government, offers this collection of real-time space weather data. Available here are different types of up-to-date data for solar conditions, ionospheric conditions, and geomagnetic conditions.

336

"Real-Time" Case Studies in Organizational Communication  

ERIC Educational Resources Information Center

This article presents an activity that integrates theory and application by examining the multiple communication events affecting a single organization in "real time" over the course of an academic term. The "real-time" case study (RTCS) avails students of the opportunity to examine organizational communication events as they are occurring in…

Long, Shawn D.

2005-01-01

337

ccsd00001825, Development of Real Time Diagnostics and  

E-print Network

to non-algorithmic methods like Digital or Cellular Neural/Nonlinear Networks. The real time hardware Abstract. Real time control of many plasma parameters will be an essential aspect in the development, the most important plasma quantities. With regard to feedback algorithms, new model-based controllers were

338

Real-Time Landslide Warning During Heavy Rainfall  

Microsoft Academic Search

A real-time system for issuing warnings of landslides during major storms is being developed for the San Francisco Bay region, California. The system is based on empirical and theoretical relations between rainfall and landslide initiation, geologic determination of areas sus­ ceptible to landslides, real-time monitoring of a regional network oftelemetering rain gages, and National Weath­ er Service precipitation forecasts. This

DAVID K. KEEFER; RAYMOND C. WILSON; R. K. MARK; EARL E. BRABB; WILLIAM M. BROWN; STEPHEN D. ELLEN; EDWIN L. HARP; G. F. WIECZOREK; C. S. ALGER; R. S. ZATKIN

1987-01-01

339

Repsol Cartagena Utilities Real Time Optimization -- A Success Story  

E-print Network

for Real Time Optimization (RTO) which runs on an NT-based workstation. ProfitMax uses the NOVA modeling system from DOT Products Inc. for non-linear modeling and optimization. Data is supplied through Uniformance PHD, Honeywell Hi-Spec Solutions' real time...

Piccolo, M.; Shyr, S.

340

Real Time Flux Control in PM Motors  

SciTech Connect

Significant research at the Oak Ridge National Laboratory (ORNL) Power Electronics and Electric Machinery Research Center (PEEMRC) is being conducted to develop ways to increase (1) torque, (2) speed range, and (3) efficiency of traction electric motors for hybrid electric vehicles (HEV) within existing current and voltage bounds. Current is limited by the inverter semiconductor devices' capability and voltage is limited by the stator wire insulation's ability to withstand the maximum back-electromotive force (emf), which occurs at the upper end of the speed range. One research track has been to explore ways to control the path and magnitude of magnetic flux while the motor is operating. The phrase, real time flux control (RTFC), refers to this mode of operation in which system parameters are changed while the motor is operating to improve its performance and speed range. RTFC has potential to meet an increased torque demand by introducing additional flux through the main air gap from an external source. It can augment the speed range by diverting flux away from the main air gap to reduce back-emf at high speeds. Conventional RTFC technology is known as vector control [1]. Vector control decomposes the stator current into two components; one that produces torque and a second that opposes (weakens) the magnetic field generated by the rotor, thereby requiring more overall stator current and reducing the efficiency. Efficiency can be improved by selecting a RTFC method that reduces the back-emf without increasing the average current. This favors methods that use pulse currents or very low currents to achieve field weakening. Foremost in ORNL's effort to develop flux control is the work of J. S. Hsu. Early research [2,3] introduced direct control of air-gap flux in permanent magnet (PM) machines and demonstrated it with a flux-controlled generator. The configuration eliminates the problem of demagnetization because it diverts all the flux from the magnets instead of trying to oppose it. It is robust and could be particularly useful for PM generators and electric vehicle drives. Recent efforts have introduced a brushless machine that transfers a magneto-motive force (MMF) generated by a stationary excitation coil to the rotor [4]. Although a conventional PM machine may be field weakened using vector control, the air-gap flux density cannot be effectively enhanced. In Hsu's new machine, the magnetic field generated by the rotor's PM may be augmented by the field from the stationery excitation coil and channeled with flux guides to its desired destination to enhance the air-gap flux that produces torque. The magnetic field can also be weakened by reversing the current in the stationary excitation winding. A patent for advanced technology in this area is pending. Several additional RTFC methods have been discussed in open literature. These include methods of changing the number of poles by magnetizing and demagnetizing the magnets poles with pulses of current corresponding to direct-axis (d-axis) current of vector control [5,6], changing the number of stator coils [7], and controlling the air gap [8]. Test experience has shown that the magnet strengths may vary and weaken naturally as rotor temperature increases suggesting that careful control of the rotor temperature, which is no easy task, could yield another method of RTFC. The purpose of this report is to (1) examine the interaction of rotor and stator flux with regard to RTFC, (2) review and summarize the status of RTFC technology, and (3) compare and evaluate methods for RTFC with respect to maturity, advantages and limitations, deployment difficulty and relative complexity.

Otaduy, P.J.

2005-09-27

341

Real-Time Task Scheduling under Thermal Constraints  

E-print Network

levels. In this study, we focus on thermally-constrained hard real-time systems, where timing guarantees must be met without exceeding safe temperature levels within the microprocessor. Speed scaling mechanisms provided in many of today’s processors...

Ahn, Youngwoo

2010-10-12

342

The ISCOR real-time industrial data processing system  

Microsoft Academic Search

A real-time industrial data processing system collects information, processes it, and responds to the user in sufficient time to influence or control the production processes, material distribution and accounting records.

W. M. Lambert; W. R. Ruffels

1968-01-01

343

Software development with real-time collaborative editing  

E-print Network

This thesis presents Collabode, a web-based integrated development environment for Java. With real-time collaborative editing, multiple programmers can use Collabode to edit the same source code at the same time. Collabode ...

Goldman, Max, Ph. D. Massachusetts Institute of Technology

2012-01-01

344

Real-time Multi-period truckload routing problems  

E-print Network

In this thesis we consider a multi-period truckload pick-up and delivery problem dealing with real-time requests over a finite time horizon. We introduce the notion of postponement of requests, whereby the company can ...

Limpaitoon, Tanachai

2008-01-01

345

Hardware for a real-time multiprocessor simulator  

NASA Technical Reports Server (NTRS)

The hardware for a real time multiprocessor simulator (RTMPS) developed at the NASA Lewis Research Center is described. The RTMPS is a multiple microprocessor system used to investigate the application of parallel processing concepts to real time simulation. It is designed to provide flexible data exchange paths between processors by using off the shelf microcomputer boards and minimal customized interfacing. A dedicated operator interface allows easy setup of the simulator and quick interpreting of simulation data. Simulations for the RTMPS are coded in a NASA designed real time multiprocessor language (RTMPL). This language is high level and geared to the multiprocessor environment. A real time multiprocessor operating system (RTMPOS) has also been developed that provides a user friendly operator interface. The RTMPS and supporting software are currently operational and are being evaluated at Lewis. The results of this evaluation will be used to specify the design of an optimized parallel processing system for real time simulation of dynamic systems.

Blech, R. A.; Arpasi, D. J.

1984-01-01

346

MARS: The Magnet II Real-Time Scheduling Algorithm  

Microsoft Academic Search

A real-time scheduling algorithm for AsynchronousTime Sharing based switching nodes is presented. Threeclasses of traffic sources are considered to load theswitching nodes: real-time video sources with guaranteedmaximum end-to-end delay SIfor all cells; realtimevoice sources with guaranteed end-to-end delaySII, ffl% cell loss rate and average gap length j; anddata traffic with guaranteed minimum average throughputand maximum average time delay. The proposedalgorithm

Jay M. Hyman; Aurel A. Lazar; Giovanni Pacifici

1991-01-01

347

Real-Time Based Agent Architecture for Power Plant Control  

Microsoft Academic Search

Building upon the work of the multi-agent system (MAS) based intelligent heuristic optimal control system (MAS-IHOCS) a new distributed real-time agent framework with time-warp (DRAFT) has been developed to enhance performance and development of multi-agent systems used to control real time processes. Using distributed discrete event simulation techniques for optimistic simulation with time-warp speeds up the simulation of the multi-agent

Joel H. Van Sickel; Kwang Y. Lee

2009-01-01

348

Department of Biological Sciences Detecting Natural Selection in Real Time:Detecting Natural Selection in Real Time  

E-print Network

Rich King Department of Biological Sciences Detecting Natural Selection in Real Time:Detecting Natural Selection in Real Time: Examples from Lake Erie Snake PopulationsExamples from Lake Erie Snake Populations #12;What is Natural Selection? As many more individuals of each species are born than can possibly

King, Richard B.

349

Expert systems for real-time monitoring and fault diagnosis  

NASA Technical Reports Server (NTRS)

Methods for building real-time onboard expert systems were investigated, and the use of expert systems technology was demonstrated in improving the performance of current real-time onboard monitoring and fault diagnosis applications. The potential applications of the proposed research include an expert system environment allowing the integration of expert systems into conventional time-critical application solutions, a grammar for describing the discrete event behavior of monitoring and fault diagnosis systems, and their applications to new real-time hardware fault diagnosis and monitoring systems for aircraft.

Edwards, S. J.; Caglayan, A. K.

1989-01-01

350

Dynamic Integrated Scheduling of Hard Real-Time, Soft Real-Time and Non-Real-Time Processes  

E-print Network

classes, and may compli- cate slack management. In contrast, a unified, integrated scheduling approach may period adjustments for fine-grained control of both resource amounts and timing. 2. The RAD CPU

Miller, Ethan L.

351

Algorithm for Unfolding Current from Faraday Rotation Measurement  

SciTech Connect

Various methods are described to translate Faraday rotation measurements into a useful representation of the dynamic current under investigation[1]. For some experiments, simply counting the “fringes” up to the turnaround point in the recorded Faraday rotation signal is sufficient in determining the peak current within some allowable fringe uncertainty. For many other experiments, a higher demand for unfolding the entire dynamic current profile is required. In such cases, investigators often rely extensively on user interaction on the Faraday rotation data by visually observing the data and making logical decisions on what appears to be turnaround points and/or inflections in the signal. After determining extrema, inflection points, and locations, a piece-wise, ?I/?t, representation of the current may be revealed with the proviso of having a reliable Verdet constant of the Faraday fiber or medium and time location for each occurring fringe. In this paper, a unique software program is reported which automatically decodes the Faraday rotation signal into a time-dependent current representation. System parameters such as the Faraday fiber’s Verdet constant and number of loops in the sensor are the only user-interface inputs. The central aspect of the algorithm utilizes a short-time Fourier transform (STFT) which reveals much of the Faraday rotation’s hidden detail necessary for unfolding the dynamic current measurement.

Stephen E. Mitchell

2008-05-23

352

Vector processing enhancements for real-time image analysis.  

SciTech Connect

A real-time image analysis system was developed for beam imaging diagnostics. An Apple Power Mac G5 with an Active Silicon LFG frame grabber was used to capture video images that were processed and analyzed. Software routines were created to utilize vector-processing hardware to reduce the time to process images as compared to conventional methods. These improvements allow for more advanced image processing diagnostics to be performed in real time.

Shoaf, S.; APS Engineering Support Division

2008-01-01

353

Processor tradeoffs in distributed real-time systems  

NASA Technical Reports Server (NTRS)

The problem of the optimization of the design of real-time distributed systems is examined with reference to a class of computer architectures similar to the continuously reconfigurable multiprocessor flight control system structure, CM2FCS. Particular attention is given to the impact of processor replacement and the burn-in time on the probability of dynamic failure and mean cost. The solution is obtained numerically and interpreted in the context of real-time applications.

Krishna, C. M.; Shin, Kang G.; Bhandari, Inderpal S.

1987-01-01

354

Real-Time Center Detection of an OLED Structure  

Microsoft Academic Search

The research presented in this paper focuses on real-time image processing for visual servoing, i.e. the positioning of a\\u000a x-y table by using a camera only instead of encoders. A camera image stream plus real-time image processing determines the\\u000a position in the next iteration of the table controller. With a frame rate of 1000 fps, a maximum processing time of

Roel Pieters; Pieter Jonker; Henk Nijmeijer

2009-01-01

355

Real-time compressive sensing spectral domain optical coherence tomography.  

PubMed

We developed and demonstrated real-time compressive sensing (CS) spectral domain optical coherence tomography (SD-OCT) B-mode imaging at excess of 70 fps. The system was implemented using a conventional desktop computer architecture having three graphics processing units. This result shows speed gain of 459 and 112 times compared to the best CS implementations based on the MATLAB and C++, respectively, and that real-time CS SD-OCT imaging can finally be realized. PMID:24365826

Xu, Daguang; Huang, Yong; Kang, Jin U

2014-01-01

356

Real-time audio multicasting on bluetooth network  

Microsoft Academic Search

Bluetooth has been deployed in many mobile devices nowadays which still lacking of real-time multicast support. In this paper, the real-time audio multicasting protocol has been proposed by using Piconet multicast partitioning and prioritization with BNEP broadcasting scheme in the ACL link. The simulation results show that the system throughput aggregation has been increased. Also the delay and inter-packet time

Sayam Pinkumphi; Anan Phonphoem

2009-01-01

357

Real-time functional magnetic resonance imaging: methods and applications  

Microsoft Academic Search

Functional magnetic resonance imaging (fMRI) has been limited by time-consuming data analysis and a low signal-to-noise ratio, impeding online analysis. Recent advances in acquisition techniques, computational power and algorithms increased the sensitivity and speed of fMRI significantly, making real-time analysis and display of fMRI data feasible. So far, most reports have focused on the technical aspects of real-time fMRI (rtfMRI).

Nikolaus Weiskopf; Ranganatha Sitaram; Oliver Josephs; Ralf Veit; Frank Scharnowski; Rainer Goebele; Niels Birbaumer; Ralf Deichmann; Klaus Mathiakf

358

Real-time compressive sensing spectral domain optical coherence tomography  

PubMed Central

We developed and demonstrated real-time compressive sensing (CS) spectral domain optical coherence tomography (SD OCT) B-mode imaging at excess of 70 fps. The system was implemented using a conventional desktop computer architecture having three graphics processing units (GPUs). This result shows speed gain of 459 and 112 times compared to best CS implementations based on the MATLAB and C++ respectively and that real-time CS-SDOCT imaging can finally be realized. PMID:24365826

Xu, Daguang; Huang, Yong; Kang, Jin U.

2014-01-01

359

Real-time dynamic simulation of the Cassini spacecraft using DARTS. Part 2: Parallel/vectorized real-time implementation  

NASA Technical Reports Server (NTRS)

Part 1 of this paper presented the requirements for the real-time simulation of Cassini spacecraft along with some discussion of the DARTS algorithm. Here, in Part 2 we discuss the development and implementation of parallel/vectorized DARTS algorithm and architecture for real-time simulation. Development of the fast algorithms and architecture for real-time hardware-in-the-loop simulation of spacecraft dynamics is motivated by the fact that it represents a hard real-time problem, in the sense that the correctness of the simulation depends on both the numerical accuracy and the exact timing of the computation. For a given model fidelity, the computation should be computed within a predefined time period. Further reduction in computation time allows increasing the fidelity of the model (i.e., inclusion of more flexible modes) and the integration routine.

Fijany, A.; Roberts, J. A.; Jain, A.; Man, G. K.

1993-01-01

360

The case for feedback control real-time scheduling  

Microsoft Academic Search

Despite the significant body of results in real-time scheduling, many real world problems are not easily supported. While algorithms such as Earliest Deadline First, Rate Monotonic, and the Spring scheduling algorithm can support sophisticated task set characteristics (such as deadlines, precedence constraints, shared resources, jitter, etc.), they are all \\

Jack A. Stankovic; Chenyang Lu; Sang Hyuk Son; Gang Tao

1999-01-01

361

Master thesis at IMM, DTU Real-time Caustics  

E-print Network

Master thesis at IMM, DTU Real-time Caustics Sune Larsen, s991411 IMM-M.Sc.-2006-35 #12;2 Abstract A caustic is a lighting effect that occurs in nature and due to the beauty of the effect, the computer industries. This thesis attempts to sum up what algorithms has been attempted to simulate caustics in real

362

Unified Loop Closing and Recovery for Real Time Monocular SLAM  

E-print Network

Unified Loop Closing and Recovery for Real Time Monocular SLAM Ethan Eade and Tom Drummond Machine and mapping. Within a graph-based map representation, we show that recovery and loop closing both reduce makes RTMS unusable for most real-world sequences, and motivates the development of active recovery

Kim, Tae-Kyun

363

Faraday spectroscopy in an optical lattice: a continuous probe of atom dynamics  

E-print Network

The linear Faraday effect is used to implement a continuous measurement of the spin of a sample of laser cooled atoms trapped in an optical lattice. One of the optical lattice beams serves also as a probe beam, thereby allowing one to monitor the atomic dynamics in real time and with minimal perturbation. A simple theory is developed to predict the measurement sensitivity and associated cost in terms of decoherence caused by the scattering of probe photons. Calculated signal-to-noise ratios in measurements of Larmor precession are found to agree with experimental data for a wide range of lattice intensity and detuning. Finally, quantum backaction is estimated by comparing the measurement sensitivity to spin projection noise, and shown to be insignificant in the current experiment. A continuous quantum measurement based on Faraday spectroscopy in optical lattices may open up new possibilities for the study of quantum feedback and classically chaotic quantum systems.

Greg Smith; Souma Chaudhury; Poul S. Jessen

2003-04-24

364

Faraday-effect polarimeter-interferometer system for current density measurement on EAST.  

PubMed

A multichannel far-infrared laser-based POlarimeter-INTerferometer (POINT) system utilizing the three-wave technique is under development for current density and electron density profile measurements in the EAST tokamak. Novel molybdenum retro-reflectors are mounted in the inside wall for the double-pass optical arrangement. A Digital Phase Detector with 250 kHz bandwidth, which will provide real-time Faraday rotation angle and density phase shift output, have been developed for use on the POINT system. Initial calibration indicates the electron line-integrated density resolution is less than 5 × 10(16) m(-2) (?2°), and the Faraday rotation angle rms phase noise is <0.1°. PMID:25430168

Liu, H Q; Jie, Y X; Ding, W X; Brower, D L; Zou, Z Y; Li, W M; Wang, Z X; Qian, J P; Yang, Y; Zeng, L; Lan, T; Wei, X C; Li, G S; Hu, L Q; Wan, B N

2014-11-01

365

Near real-time and real-time GNSS Precise Point Positioning with external a priori troposphere models  

NASA Astrophysics Data System (ADS)

Precise Point Positioning (PPP) is a positioning technique that uses a single GNSS (Global Navigation Satellite System) receiver that requires external information from analysis of global GNSS permanent network, in particular precise orbits and satellite clocks. This technique is commonly used in post-processing mode and gives results comparable to relative positioning. A shortcoming of this technique is the time required for the solution to converge, which is a main limitation for near real-time and real-time applications. The convergence time depends on the quality of GNSS data, on the accuracy of the a priori parameters and on fast ambiguity resolution. Until recently, near real-time and real-time users were limited in the sources of precise products, since only the predicted part of the ultra-rapid products were available. In 2012, the International GNSS Service (IGS) launched the Real-Time Service (RTS), making available a dedicated set of real-time products, known as IGS-RTS. Nevertheless, there is still no standard procedure for handling the troposphere delay. The a priori troposphere delay, as well as mapping functions, has to be derived from an external source and the adjustment model should account for the correction to an apriori value of the delay. Currently, a number of empirical troposphere state models and mapping functions are available for users in real-time. Near-real time model of troposphere delay can also be determined from the analysis of regional GNSS permanent network. In this paper, we make use of the IGS-RTS along with a number of a priori tropospheric models in order the assess how they influence convergence time and estimated position. For this purpose, we use GPS Analysis and Positioning Software (GAPS) for near-real time processing and GNSS-Wroclaw Algorithms for Real-time Positioning (GNSS-WARP) software for real-time processing of GPS only data together with IGS-RTS precise orbits and satellite clocks. As a priori troposphere model we used GPT together with the Saastamoinen formula, UNB3 model and regional near-real time troposphere model from the analysis of a network of permanent GNSS stations. We combine these models with Niell and VMF mapping functions to compute slant troposphere delays, including those of low-elevation satellites.

Hadas, Tomasz; Santos, Marcelo; Garcia, Alex; Bosy, Jaroslaw; Kaplon, Jan

2014-05-01

366

Aperiodic Task Scheduling for Hard Real-Time Systems  

Microsoft Academic Search

 A real-time system consists of both aperiodic and periodic tasks. Periodic tasks have regular arrival times and hard deadlines. Aperiodic tasks have irregular arrival times and either soft or hard deadlines. In this article, we present a new algorithm, the Sporadic Server algorithm, which greatly improves response times for soft deadline aperiodic tasks and can guarantee hard deadlines for both

Brinkley Sprunt; Lui Sha; John P. Lehoczky

1989-01-01

367

Building flexible real-time systems using the Flex language  

NASA Technical Reports Server (NTRS)

The design and implementation of a real-time programming language called Flex, which is a derivative of C++, are presented. It is shown how different types of timing requirements might be expressed and enforced in Flex, how they might be fulfilled in a flexible way using different program models, and how the programming environment can help in making binding and scheduling decisions. The timing constraint primitives in Flex are easy to use yet powerful enough to define both independent and relative timing constraints. Program models like imprecise computation and performance polymorphism can carry out flexible real-time programs. In addition, programmers can use a performance measurement tool that produces statistically correct timing models to predict the expected execution time of a program and to help make binding decisions. A real-time programming environment is also presented.

Kenny, Kevin B.; Lin, Kwei-Jay

1991-01-01

368

ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE  

E-print Network

ASSESSMENT AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE Final Report AND REFINEMENT OF REAL-TIME TRAVEL TIME ALGORITHMS FOR USE IN PRACTICE 5. Report Date June 2007 Final Report 6 to display travel times on their Dynamic Message Signs (DMS). The Oregon Department of Transportation (ODOT

Bertini, Robert L.

369

DEVELOPING IMPROVED TRAVEL TIME RELIABILITY MEASURES FOR REAL-TIME AND ARCHIVED ITS DATA  

E-print Network

1 DEVELOPING IMPROVED TRAVEL TIME RELIABILITY MEASURES FOR REAL-TIME AND ARCHIVED ITS DATA Travel time estimation is of increasing importance as congestion worsens in major urban areas. Travel examines the use of measured travel time reliability indices for improving real-time transportation

Bertini, Robert L.

370

Arterial Travel Time Characterization and Real-time Traffic Condition Identification  

E-print Network

Arterial Travel Time Characterization and Real-time Traffic Condition Identification Using GPS of Arterial Travel Time · Link Travel Time Distribution Estimation · Mean Route Travel Time Estimation · Real 3 #12;Introduction · Monitoring system on arterials has lagged behind what is done on freeways, due

Minnesota, University of

371

Toward natural interaction in the real world: real-time gesture recognition  

E-print Network

Using a new hand tracking technology capable of tracking 3D hand postures in real-time, we developed a recognition system for continuous natural gestures. By natural gestures, we mean those encountered in spontaneous ...

Yin, Ying

372

Information filtering for ultrasound-based real-time registration.  

PubMed

This paper presents methods based on information filters for solving matching problems with emphasis on real time, or effectively real-time applications. Both applications discussed in this paper deal with ultrasound-based rigid registration in computer-assisted orthopedic surgery. In the first application, the usual workflow of rigid registration is reformulated such that registration algorithms would iterate while the surgeon is acquiring ultrasound images of the anatomy to be operated. Using this effectively real-time approach to registration, the surgeon would then receive feedback in order to better gauge the quality of the final registration outcome. The second application considered in this paper circumvents the need to attach physical markers to bones for anatomical referencing. Experiments using anatomical objects immersed in water are performed in order to evaluate and compare the different methods presented herein, using both 2-D as well as real-time 3-D ultrasound. PMID:20693105

Talib, Haydar; Peterhans, Matthias; García, Jaime; Styner, Martin; González Ballester, Miguel A

2011-03-01

373

ARTEMIS. Ares Real Time Environment for Modeling, Integrating, and Simulation  

NASA Technical Reports Server (NTRS)

This slide presentation reviews the ARTEMIS (Ares Real Time Environment for Modeling, Integration, and Simulation) for Ares hardware testing. It includes information on the ARTEMIS organization, SIL architecture, and I/O layer.

Walker, David; Hughes, Ryan

2009-01-01

374

Scheduling of real-time communication network for parallel processing  

E-print Network

As real-time applications become more and more complicated their demands of processing capacity can hardly be satisfied. Massively parallel computers, such as Intel Paragon, with their scalable architecture and tremendous processing power make them...

Li, Hung

1995-01-01

375

Decoupled Sampling for Real-Time Graphics Pipelines  

E-print Network

We propose decoupled sampling, an approach that decouples shading from visibility sampling in order to enable motion blur and depth-of-field at reduced cost. More generally, it enables extensions of modern real-time graphics ...

Ragan-Kelley, Jonathan

2010-03-29

376

Intelligent data management for real-time spacecraft monitoring  

NASA Technical Reports Server (NTRS)

Real-time AI systems have begun to address the challenge of restructuring problem solving to meet real-time constraints by making key trade-offs that pursue less than optimal strategies with minimal impact on system goals. Several approaches for adapting to dynamic changes in system operating conditions are known. However, simultaneously adapting system decision criteria in a principled way has been difficult. Towards this end, a general technique for dynamically making such trade-offs using a combination of decision theory and domain knowledge has been developed. Multi-attribute utility theory (MAUT), a decision theoretic approach for making one-time decisions is discussed and dynamic trade-off evaluation is described as a knowledge-based extension of MAUT that is suitable for highly dynamic real-time environments, and provides an example of dynamic trade-off evaluation applied to a specific data management trade-off in a real-world spacecraft monitoring application.

Schwuttke, Ursula M.; Gasser, Les; Abramson, Bruce

1992-01-01

377

Real-Time Parameter Estimation in the Frequency Domain  

NASA Technical Reports Server (NTRS)

A method for real-time estimation of parameters in a linear dynamic state space model was developed and studied. The application is aircraft dynamic model parameter estimation from measured data in flight for indirect adaptive or reconfigurable control. Equation error in the frequency domain was used with a recursive Fourier transform for the real-time data analysis. Linear and nonlinear simulation examples and flight test data from the F-18 High Alpha Research Vehicle HARV) were used to demonstrate that the technique produces accurate model parameter estimates with appropriate error bounds. Parameter estimates converged in less than 1 cycle of the dominant dynamic mode natural frequencies, using control surface inputs measured in flight during ordinary piloted maneuvers. The real-time parameter estimation method has low computational requirements, and could be implemented aboard an aircraft in real time.

Morelli, Eugene A.

1999-01-01

378

Real Time Mobile Robot Sonar with Interference Rejection Lindsay Kleeman  

E-print Network

Real Time Mobile Robot Sonar with Interference Rejection Lindsay Kleeman Intelligent Robotics words: ultrasonic, sonar, tracking, interference rejection, bearing. Abstract A new approach to rejecting interference between sonar systems is presented in this paper. The approach is based

379

Challenges of AVHRR Vegetation Data for Real Time Applications  

NASA Technical Reports Server (NTRS)

Remote sensing data has long been used to monitor global ecosystems for floods and droughts and AVHRR data, as one of the first product, has many users interested in receiving the data within hours of acquisition. With the introduction of a new series of sensors in 2000 (the AVHRR/3 series), the quality of the NDVI datasets available for real time environmental monitoring has declined. This paper provides evidence of problems of cloud contamination, calibration and noise in the real time data which are not present in the historical AVHRR NDVIg dataset. These differences introduce significant uncertainty in the use of the real time data, degrading their utility for detecting climate variations in near real time.

Brown, Molly

2008-01-01

380

Real-time continuous gesture recognition for natural multimodal interaction  

E-print Network

I have developed a real-time continuous gesture recognition system capable of dealing with two important problems that have previously been neglected: (a) smoothly handling two different kinds of gestures: those characterized ...

Yin, Ying, Ph. D. Massachusetts Institute of Technology

2014-01-01

381

Real-Time Manipulation with Magnetically Tunable Structures  

E-print Network

Magnetically tunable micropillar arrays with uniform, continuous and extreme tilt angles for real-time manipulation are reported. We experimentally show uniform tilt angles ranging from 0° to 57°, and develop a model to ...

Zhu, Yangying

382

Real-time earthquake monitoring: Early warning and rapid response  

NASA Technical Reports Server (NTRS)

A panel was established to investigate the subject of real-time earthquake monitoring (RTEM) and suggest recommendations on the feasibility of using a real-time earthquake warning system to mitigate earthquake damage in regions of the United States. The findings of the investigation and the related recommendations are described in this report. A brief review of existing real-time seismic systems is presented with particular emphasis given to the current California seismic networks. Specific applications of a real-time monitoring system are discussed along with issues related to system deployment and technical feasibility. In addition, several non-technical considerations are addressed including cost-benefit analysis, public perceptions, safety, and liability.

1991-01-01

383

Cluster Computing for Embedded/Real-Time Systems  

NASA Technical Reports Server (NTRS)

Embedded and real-time systems, like other computing systems, seek to maximize computing power for a given price, and thus can significantly benefit from the advancing capabilities of cluster computing.

Katz, D.; Kepner, J.

1999-01-01

384

76 FR 42536 - Real-Time System Management Information Program  

Federal Register 2010, 2011, 2012, 2013, 2014

...requirements of the Real-Time System Management Information Program...with 5.9 GHz communications systems for safety enhancement ultimately...of the rule. However, these cooperative communication systems are unlikely to be...

2011-07-19

385

Towards Real Time Optimal Auto-tuning of PID Controllers  

E-print Network

, to real time system control. The design method is based on a complete characterization of the set of stabilizing PID parameters for various plant models and a subsequent search over the stabilizing set for the optimal controller. A full implementation...

Hill, Aaron Jamison

2013-08-22

386

Real-time Water Waves with Wave Particles  

E-print Network

This dissertation describes the wave particles technique for simulating water surface waves and two way fluid-object interactions for real-time applications, such as video games. Water exists in various different forms in our environment...

Yuksel, Cem

2010-10-12

387

Exploring real-time video interactivity with Scratch  

E-print Network

Real-time video interactivity is becoming increasingly popular in today's world with the advent of better and more affordable video input devices. With the recent release of the Microsoft Kinect followed by an official ...

Hwang, Ting-Hsiang Tony

2012-01-01

388

Real-time data compression of broadcast video signals  

NASA Technical Reports Server (NTRS)

A non-adaptive predictor, a nonuniform quantizer, and a multi-level Huffman coder are incorporated into a differential pulse code modulation system for coding and decoding broadcast video signals in real time.

Shalkauser, Mary Jo W. (inventor); Whyte, Wayne A., Jr. (inventor); Barnes, Scott P. (inventor)

1991-01-01

389

Real time active sonar simulation in a deep ocean environment  

E-print Network

Accurate Simulations are important in all fields of science and engineering where experiments and real data are time consuming to obtain and are not easily accessible and/or free of cost. Particularly when operating in ...

Danesh, Sheida Anya

2013-01-01

390

Real time face recognition using adaboost improved fast PCA algorithm  

E-print Network

This paper presents an automated system for human face recognition in a real time background world for a large homemade dataset of persons face. The task is very difficult as the real time background subtraction in an image is still a challenge. Addition to this there is a huge variation in human face image in terms of size, pose and expression. The system proposed collapses most of this variance. To detect real time human face AdaBoost with Haar cascade is used and a simple fast PCA and LDA is used to recognize the faces detected. The matched face is then used to mark attendance in the laboratory, in our case. This biometric system is a real time attendance system based on the human face recognition with a simple and fast algorithms and gaining a high accuracy rate..

Kumar, K Susheel; Tripathi, R C

2011-01-01

391

Real-Time Approximate Subsurface Scattering  

Microsoft Academic Search

Subsurface scattering is a complex physical process, which, in many cases, significantly affects the appearance of certain materials. In the pursuit of generating ever more realistic scenes, it is a phenomenon which must be incorporated into rendering frameworks. However, the complexity of the physical process which causes subsurface scattering has a tremendous effect on rendering time. Though such rendering costs

Robert Patro

2007-01-01

392

Real-time information management environment (RIME)  

Microsoft Academic Search

Whereas data mining and exploitation improve the quality and quantity of information available to the user, there remains a mission requirement to assist the end-user in managing the access to this information and ensuring that the appropriate information is delivered to the right user in time to make decisions and take action. This paper discusses TASC's federated architecture to next-

Brian T. DeCleene; Sean Griffin; Garry Matchett; Richard Niejadlik

2000-01-01

393

Evaluation of Open-Source Hard Real Time Software Packages  

NASA Technical Reports Server (NTRS)

Reliable software is, at times, hard to find. No piece of software can be guaranteed to work in every situation that may arise during its use here at Glenn Research Center or in space. The job of the Software Assurance (SA) group in the Risk Management Office is to rigorously test the software in an effort to ensure it matches the contract specifications. In some cases the SA team also researches new alternatives for selected software packages. This testing and research is an integral part of the department of Safety and Mission Assurance. Real Time operation in reference to a computer system is a particular style of handing the timing and manner with which inputs and outputs are handled. A real time system executes these commands and appropriate processing within a defined timing constraint. Within this definition there are two other classifications of real time systems: hard and soft. A soft real time system is one in which if the particular timing constraints are not rigidly met there will be no critical results. On the other hand, a hard real time system is one in which if the timing constraints are not met the results could be catastrophic. An example of a soft real time system is a DVD decoder. If the particular piece of data from the input is not decoded and displayed to the screen at exactly the correct moment nothing critical will become of it, the user may not even notice it. However, a hard real time system is needed to control the timing of fuel injections or steering on the Space Shuttle; a delay of even a fraction of a second could be catastrophic in such a complex system. The current real time system employed by most NASA projects is Wind River's VxWorks operating system. This is a proprietary operating system that can be configured to work with many of NASA s needs and it provides very accurate and reliable hard real time performance. The down side is that since it is a proprietary operating system it is also costly to implement. The prospect of replacing this somewhat costly implementation is the focus of one of the SA group s current research projects. The explosion of open source software in the last ten years has led to the development of a multitude of software solutions which were once only produced by major corporations. The benefits of these open projects include faster release and bug patching cycles as well as inexpensive if not free software solutions. The main packages for hard real time solutions under Linux are Real Time Application Interface (RTAI) and two varieties of Real Time Linux (RTL), RTLFree and RTLPro. During my time here at NASA I have been testing various hard real time solutions operating as layers on the Linux Operating System. All testing is being run on an Intel SBC 2590 which is a common embedded hardware platform. The test plan was provided to me by the Software Assurance group at the start of my internship and my job has been to test the systems by developing and executing the test cases on the hardware. These tests are constructed so that the Software Assurance group can get hard test data for a comparison between the open source and proprietary implementations of hard real time solutions.

Mattei, Nicholas S.

2004-01-01

394

Real time network simulation with PC-cluster  

Microsoft Academic Search

This paper presents a new architecture layout for a real-time power system simulator based on a distributed cluster of IBM PC-compatible desktop computers. A real-time network simulator based on a PC cluster can successfully cope with the size requirements of growing power systems and the computational demands of fast transient studies. A powerful product has been developed using off-the-shelf Pentium

Jorge Ariel Hollman; José Ramón Martí

2003-01-01

395

Real time identification of structures with magnetorheological dampers  

Microsoft Academic Search

A real-time identification algorithm for structures with magnetorheological dampers as energy dissipation devices is described. These dampers are modeled by the use of a modified LuGre dynamic friction model, whose internal state is calculated with a nonlinear observer. The convergence analysis for the identification-observer scheme is presented. The scheme is intended for real time protection of structures during seismic excitation.

R. Jimnez; L. Alvarez

2002-01-01

396

Scheduling real-time transactions: a performance evaluation  

Microsoft Academic Search

Managing transactions with real-time requirements presents many new problems. In this paper we address several: How can we schedule transactions with deadlines? How do the real-time constraints affect concurrency control? How should overloads be handled? How does the scheduling of 1\\/0 requests affect the timeliness of transactions? How should exclusive and shared locking be handled? We describe a new group

Robert K. Abbott; Hector Garcia-Molina

1992-01-01

397

Real-Time Garbage Collection for a Multithreaded Java Microcontroller  

Microsoft Academic Search

We envision the upcoming of microcontrollers and systems-on-chip that are based on multithreaded processor kernels due to the fast context switching ability of hardware multithreading. Moreover we envision an extensive market for Java-based applications in embedded real-time systems. This paper introduces two new garbage collection algorithms that are dedicated to real-time garbage collection on a multithreaded Java microcontroller. Our garbage

Matthias Pfeffer; Theo Ungerer; Stephan Fuhrmann; Jochen Kreuzinger; Uwe Brinkschulte

2004-01-01

398

Real-Time Garbage Collection for a Multithreaded Java Microcontroller  

Microsoft Academic Search

We envision the upcoming of microcontrollers and systems-on-a-chip that are based on multithreaded proces- sor kernels due to the fast context switching ability of hard- ware multithreading. Moreover we envision an extensive market for Java-based applications in embedded real-time systems. This paper introduces two new garbage collection algo- rithms that are dedicated to real-time garbage collection on a multithreaded Java

Stephan Fuhrmann; Matthias Pfeffer; Jochen Kreuzinger; Theo Ungerer; Uwe Brinkschulte

2001-01-01

399

Learning to Act Using Real-Time Dynamic Programming  

Microsoft Academic Search

Learning methods based on dynamic programming (DP) are receiving increasing attentionin artificial intelligence. Researchers have argued that DP provides the appropriatebasis for compiling planning results into reactive strategies for real-time control,as well as for learning such strategies when the system being controlled is incompletelyknown. We introduce an algorithm based on DP, which we call Real-Time DP(RTDP), by which an embedded

Andrew G. Barto; Steven J. Bradtke; Satinder P. Singh

1995-01-01

400

Real-time holographic microscope with nonlinear optics  

NASA Astrophysics Data System (ADS)

The schematic of a real-time holographic microscope featuring a phase-conjugate mirror for retroreflection and a scanning module is reported. The instrument is provided with Epi- and Dia- brightfield capabilities, video/photosensing output, and optional optoelectronic processing. An analysis of the real-time restoration process in comparison with conventional holography is presented. The paper reviews the merits and drawbacks of the setup and concludes with a brief discussion on 2-D scanning options.

Goldfain, Ervin

1991-12-01

401

Ustat : A Real-time Intrusion Detection System for Unix  

Microsoft Academic Search

UstatA Real-time Intrusion Detection Systemfor UNIXbyKoral IlgunThis thesis presents the design and implementation of a real-time intrusiondetection tool called Ustat, a State Transition Analysis Tool for UNIX.The original design was first developed by Phillip A. Porras and presented in[Porr91] as STAT, a State Transition Analysis Tool. STAT is a new modelfor representing computer penetrations, and the model is applied to

Koral Ilgun

1992-01-01

402

EMERALDS: a small-memory real-time microkernel  

Microsoft Academic Search

EMERALDS (Extensible Microkernel for Embedded, ReAL- time, Distributed Systems) is a real-time microkernel de- signed for small-memory embedded applications. These ap- plications must run on slow (15-25MHz) processors with just 32-128 kbytes of memory, either to keep production costs down in mass-produced systems or to keep weight and power consumption low. To be feasible for such applica- tions, the OS

Khawar M. Zuberi; Padmanabhan Pillai; Kang G. Shin

2000-01-01

403

RISA: A Real-Time Interactive Shadow Avatar  

Microsoft Academic Search

As Webcams become an important factor in the PC environment, many camera-based communication techniques have been developed. Among them, gesture-based communication is attracting attention. In this paper, we propose a real-time interactive shadow avatar (RISA) which can express facial emotions by changing as response to the user's gestures. The avatar's shape is a virtual shadow constructed from a real-time sampled

Yangmi Lim; Jinsu Kim; Jinseok Chae

2007-01-01

404

Real-time numerical simulation of the Carnot cycle  

Microsoft Academic Search

We developed a highly interactive, multi-windows Java applet which made it possible to simulate and visualize within any platform and internet the Carnot cycle (or engine) in a real-time computer experiment. We extended our previous model and algorithm (Galant et al 2003 Heat Transfer, Newton's Law of Cooling and the Law of Entropy Increase Simulated by the Real-Time Computer Experiments

J. Hurkala; M. Gall; R. Kutner; M. Maciejczyk

2005-01-01

405

Supporting soft real-time tasks in the xen hypervisor  

Microsoft Academic Search

Virtualization technology enables server consolidation and has given an impetus to low-cost green data centers. However, current hypervisors do not provide adequate support for real-time applications, and this has limited the adoption of virtualization in some domains. Soft real-time applications, such as media-based ones, are impeded by components of virtualization including low-performance virtualization I\\/O, increased scheduling latency, and shared-cache contention.

Min Lee; A. S. Krishnakumar; P. Krishnan; Navjot Singh; Shalini Yajnik

2010-01-01

406

Real Time CORBA-MMS for Embbeded Systems  

Microsoft Academic Search

Our work is an on-going project at CEDRIC, the computer science lab of CNAM. Our goal is to achieve a real-time messaging industrial service for embedded and real-time systems. Our framework takes its sources in two standards: ISO-MMS (Manufacturing Message Specification from OSI) [VAL92] and IEC-TASE. 2 (Telecontrol Application Service Element version 2 from IEC) [IEC96a][IEC96b], also called ICCP (Inter-Control

E. Becquet

407

Real-time power system simulation for automatic generation control  

Microsoft Academic Search

A digital simulation program used for the design of improved automatic generation control algorithms is described. The program can also be used for study of long-term system dynamics following large load or generation changes. Since the simulation runs faster than real-time, the program, can be used as a real-time power system simulator for control system checkout and operator training. The

C. W. Taylor; R. L. Cresap

1976-01-01

408

Real-Time Reliable Multicast Using Proactive Forward Error Correction  

Microsoft Academic Search

Real-Time reliable multicast over a best-effort service net- work remains a challenging research problem. Most pro- tocols for reliable multicast use repair techniques that re- sult in significant and variable delay, which can lead to missed deadlines in real-time scenarios. In this paper we present a repair technique that combines forward error cor- rection (FEC) with automatic repeat request (ARQ).

Dan Rubenstein; Jim Kurose

1998-01-01

409

Real time simulator with Ti floating point digital signal processor  

NASA Astrophysics Data System (ADS)

This paper describes the design and operation of a real time simulator using Texas Instruments TMS320C30 digital signal processor. This system operates with two banks of memory which provide the input data to digital signal processor chip. This feature enables the TMS320C30 to be utilized in variety of applications for which external connections to acquire input data is not needed. In addition, some practical applications of this real time simulator are discussed.

Razazian, K.; Bobis, J. P.; Dieckman, S. L.; Raptis, A. C.

410

The Design and Performance of Real-Time Java Middleware  

Microsoft Academic Search

Over 90 percent of all microprocessors are now used for real-time and embedded applications. Since the behav- ior of these applications is often constrained by the physi- cal world, it is important to devise higher-level languages and middleware that meet conventional functional require- ments and dependably and productively enforce real-time constraints. This paper provides two contributions to the study of

Angelo Corsaro; Douglas C. Schmidt

2003-01-01

411

CHIMERA: a real-time programming environment for manipulator control  

Microsoft Academic Search

CHIMERA is a real-time computing environment used in the Reconfigurable Modular Manipulator System project. CHIMERA, which is both a hardware and software environment, allows rapid development and implementation of real-time control programs. It provides a C\\/Unix-flavored concurrent programming environment for a Motorola 68020 multiprocessor hardware configuration connected to a Sun workstation. CHIMERA has been implemented using commercial hardware in conjunction

Donald Schmitz; Pradeep Khosla; R. Hoffman; Takeo Kanade

1989-01-01

412

High speed, real-time, camera bandwidth converter  

DOEpatents

Image data from a CMOS sensor with 10 bit resolution is reformatted in real time to allow the data to stream through communications equipment that is designed to transport data with 8 bit resolution. The incoming image data has 10 bit resolution. The communication equipment can transport image data with 8 bit resolution. Image data with 10 bit resolution is transmitted in real-time, without a frame delay, through the communication equipment by reformatting the image data.

Bower, Dan E; Bloom, David A; Curry, James R

2014-10-21

413

Using Switched Ethernet for Hard Real-Time Communication  

Microsoft Academic Search

Previous results on traffic shaping on Switched Ethernet technology demonstrate its practicability and effectiveness for hard real-time communication [Low-latency hard real-time communication over switched ethernet]. The application-to-application delays on a 5-node network were reported to be less than a millisecond with both Fast Ethernet and Gigabit Ethernet technology with a link utilization of 93% and 49%. In this paper we

Jork Loeser; Hermann Haertig

2004-01-01

414

Real-time variance based template matching spike sorting system  

Microsoft Academic Search

We present a real-time variance based template matching system for spike sorting. The system employs an ultra-low-power CMOS variance estimator to detect and discriminate between distinct spike classes in real-time. Simulations demonstrate reliable single-unit detection at near 0 dB SNR, and robust classification of action potentials from noisy spike trains; measured results from the variance estimation circuit are in good

A. M. Haas; M. H. Cohen; P. A. Abshire

2007-01-01

415

Real-time adaptive aircraft scheduling  

NASA Technical Reports Server (NTRS)

One of the most important functions of any air traffic management system is the assignment of ground-holding times to flights, i.e., the determination of whether and by how much the take-off of a particular aircraft headed for a congested part of the air traffic control (ATC) system should be postponed in order to reduce the likelihood and extent of airborne delays. An analysis is presented for the fundamental case in which flights from many destinations must be scheduled for arrival at a single congested airport; the formulation is also useful in scheduling the landing of airborne flights within the extended terminal area. A set of approaches is described for addressing a deterministic and a probabilistic version of this problem. For the deterministic case, where airport capacities are known and fixed, several models were developed with associated low-order polynomial-time algorithms. For general delay cost functions, these algorithms find an optimal solution. Under a particular natural assumption regarding the delay cost function, an extremely fast (O(n ln n)) algorithm was developed. For the probabilistic case, using an estimated probability distribution of airport capacities, a model was developed with an associated low-order polynomial-time heuristic algorithm with useful properties.

Kolitz, Stephan E.; Terrab, Mostafa

1990-01-01

416

In vivo real-time, multicolor, quantum dot lymphatic imaging.  

PubMed

The lymphatic network is complex and difficult to visualize in real-time in vivo. Moreover, the direction of flow within lymphatic networks is often unpredictable especially in areas with well-developed "watershed" or overlapping lymphatics. Herein, we report a method of in vivo real-time multicolor lymphatic imaging using cadmium-selenium quantum dots (Qdots) with a fluorescence imaging system that enables the simultaneous visualization of up to five distinct lymphatic basins in real-time. Five visually well-distinguishable carboxyl-Qdots (Qdot 545, 565, 585, 605, and 655) were selected and injected subdermally into mice at five different sites, and serially imaged in vivo or in situ under surgery with real-time multicolor lymphatic imaging. In all seven mice, in vivo lymphatic images successfully distinguished all five lymphatic basins with different colors in real-time. These visualizations of lymph node lasted up to at least 7 days. This method could have a considerable potential in lymphatic research for studying the anatomy and flow within the lymphatic system as well as in some limited clinical settings where real-time visible fluorescence could facilitate procedures under surgery or endoscopy. PMID:19536144

Kosaka, Nobuyuki; Ogawa, Mikako; Sato, Noriko; Choyke, Peter L; Kobayashi, Hisataka

2009-12-01

417

Improving abstraction, encapsulation, and performance within mixed-mode real-time Java applications  

Microsoft Academic Search

Much of the appeal of Java for the implementation of real-time software components derives from the ability to leverage the combination of non-real-time, soft real-time, and hard real-time components all written in the same Java language. To date, deployment of non-real-time Java far exceeds deployment of real-time Java. To improve the appeal of real-time Java, it is important to improve

Kelvin Nilsen

2007-01-01

418

Using TILCO for Specifying Real-Time Systems  

Microsoft Academic Search

The Temporal Interval Logic with Compositional Operators (TILCO) has been especially designed for the specification and validation of real-time systems. TILCO extends the classical temporal logics based on the operators eventually, and henceforth by using time intervals in order to allow the specification of both qualitative and quantitative temporal relationships. The use of time intervals also supports an abstract and

Riccardo Mattolini; Paolo Nesi

1996-01-01

419

A real-time implementable subclass of quadratic time-frequency representations  

Microsoft Academic Search

One of the major obstacles for quadratic time-frequency representations to be used in real (finite)-time applications is the computational complexity. In this paper, a real (finite)-time implementable subclass of Cohen's (1966) class of distributions (CCD) is defined using windowing techniques. The kernel function for each member in this subclass can be characterized by a necessary and sufficient real(finite)-time implementable condition

Dongsheng Wu; Joel M. Morris

1994-01-01

420

Evaluation of the Faraday angle by numerical methods and comparison with the Tore Supra and JET polarimeter electronics.  

PubMed

On the Tore Supra tokamak, a far infrared polarimeter diagnostic has been routinely used for diagnosing the current density by measuring the Faraday rotation angle. A high precision of measurement is needed to correctly reconstruct the current profile. To reach this precision, electronics used to compute the phase and the amplitude of the detected signals must have a good resilience to the noise in the measurement. In this article, the analogue card's response to the noise coming from the detectors and their impact on the Faraday angle measurements are analyzed, and we present numerical methods to calculate the phase and the amplitude. These validations have been done using real signals acquired by Tore Supra and JET experiments. These methods have been developed to be used in real-time in the future numerical cards that will replace the Tore Supra present analogue ones. PMID:21678660

Brault, C; Gil, C; Boboc, A; Spuig, P

2011-04-01

421

Toward Understanding and Reducing Errors in Real-Time Estimation of Travel Times Sirisha M. Kothuri  

E-print Network

Toward Understanding and Reducing Errors in Real-Time Estimation of Travel Times Sirisha M. Kothuri traveler information to the public. Many states as well as private contractors are providing real-time travel time estimates to commuters to help improve the quality and efficiency of their trips. Accuracy

Bertini, Robert L.

422

Response Time Analysis for Distributed Real-Time Systems with Bursty Job Arrivals  

E-print Network

Response Time Analysis for Distributed Real-Time Systems with Bursty Job Arrivals Chengzhi Li schedulability analysis methodology for distributed hard real-time systems with bursty job arrivals. If the job set in the system is static, design-time analysis validates that no tim- ing constraints

Bettati, Riccardo

423

Response Time Analysis for Distributed RealTime Systems with Bursty Job Arrivals  

E-print Network

Response Time Analysis for Distributed Real­Time Systems with Bursty Job Arrivals Chengzhi Li schedulability analysis methodology for distributed hard real­time systems with bursty job arrivals. If the job set in the system is static, design­time analysis validates that no tim­ ing constraints

Bettati, Riccardo

424

Automatic Construction of Timing Diagrams from UML/MARTE Models for Real-Time Embedded Software  

E-print Network

Automatic Construction of Timing Diagrams from UML/MARTE Models for Real-Time Embedded Software sequence diagrams and state machine diagrams with MARTE annotations. The proposed approach enables de--Methodologies Keywords UML, MARTE, timing diagram, state machine diagram, se- quence diagram, real-time embedded software

Jee, Eunkyoung

425

SETTING TARGET ROTATION TIME IN PROFIBUS BASED REAL-TIME DISTRIBUTED APPLICATIONS  

Microsoft Academic Search

In this paper, we analyse the ability of Profibus fieldbus to cope with the real-time requirements of a Distributed Computer Control System (DCCS), where messages associated to discrete events must be made available within a maximum bound time. Our methodology is based on the knowledge of real-time traffic characteristics, setting the network parameters in order to cope with timing requirements.

Eduardo Tovar; Francisco Vasques

1998-01-01

426

Real-time Fermions for Baryogenesis Simulations  

E-print Network

We study how to numerically simulate quantum fermions out of thermal equilibrium, in the context of electroweak baryogenesis. We find that by combining the lattice implementation of Aarts and Smit [1] with the "low cost" fermions of Borsanyi and Hindmarsh [2], we are able to describe the dynamics of a classical bosonic system coupled to quantum fermions, that correctly reproduces anomalous baryon number violation. To demonstrate the method, we apply it to the 1+1 dimensional axial U(1) model, and perform simulations of a fast symmetry breaking transition. Compared to solving all the quantum mode equations as in [1], we find that this statistical approach may lead to a significant gain in computational time, when applied to 3+1 dimensional physics.

Paul M. Saffin; Anders Tranberg

2011-05-27

427

Real-time airborne particle analyzer  

DOEpatents

An aerosol particle analyzer includes a laser ablation chamber, a gas-filled conduit, and a mass spectrometer. The laser ablation chamber can be operated at a low pressure, which can be from 0.1 mTorr to 30 mTorr. The ablated ions are transferred into a gas-filled conduit. The gas-filled conduit reduces the electrical charge and the speed of ablated ions as they collide and mix with buffer gases in the gas-filled conduit. Preferably, the gas filled-conduit includes an electromagnetic multipole structure that collimates the nascent ions into a beam, which is guided into the mass spectrometer. Because the gas-filled conduit allows storage of vast quantities of the ions from the ablated particles, the ions from a single ablated particle can be analyzed multiple times and by a variety of techniques to supply statistically meaningful analysis of composition and isotope ratios.

Reilly, Peter T.A.

2012-10-16

428

Clemson University's EXPerimental Engineering in Real Time (EXPERT) Program: Assessing the benefit of real-time sensors in the curriculum  

Microsoft Academic Search

EXPerimental Engineering in Real-Time (EXPERT) is a three-year NSF-sponsored project at Clemson University to study the benefit of using experiments with real-time sensors to improve student understanding of the graphical representation of various physical concepts and auxiliary benefit in understanding the concept itself. The project builds on successes by Physics education researchers (primarily with motion sensors) that combine the use

Matthew W. Ohland; Elizabeth A. Stephan; Benjamin L. Sill

429

Scheduling Algorithms for a Mixture of Real-Time and Non-Real-Time Data in HDR  

Microsoft Academic Search

High Data Rate (HDR) technologz has recently been proposed as an overlay to CDMA... In this paper, we study various scheduling algorithms for a mixture of real-time and non-real-time data over HDR\\/CDMA and compare their performance. We study the performance with respect to packet delays and also average throughput, where we use a token based mechanism to give minimum throughput

Sanjay Shakkottai; Alexander L. Stolyar

2001-01-01

430

A Formally Verified Application-Level Framework for Real-Time Scheduling on POSIX Real-Time Operating Systems  

Microsoft Academic Search

This paper presents a framework, called meta scheduler, for implementing real-time scheduling algorithms. The meta scheduler is a portable middleware layer component designed for implementations over POSIX-compliant operating systems. It accommodates pluggable real-time scheduling algorithms while offering the flexibility of platform independence —the singular underlying OS requirement is the now nearly ubiquitous POSIX compliance. The versatility of pluggable schedulers positions

Peng Li; Binoy Ravindran; Syed Suhaib; Shahrooz Feizabadi

2004-01-01

431

Real time viability detection of bacterial spores  

DOEpatents

This invention relates to a process for detecting the presence of viable bacterial spores in a sample and to a spore detection system, the process including placing a sample in a germination medium for a period of time sufficient for commitment of any present viable bacterial spores to occur, mixing the sample with a solution of a lanthanide capable of forming a fluorescent complex with dipicolinic acid, and, measuring the sample for the presence of dipicolinic acid, and the system including a germination chamber having inlets from a sample chamber, a germinant chamber and a bleach chamber, the germination chamber further including an outlet through a filtering means, the outlet connected to a detection chamber, the detection chamber having an inlet from a fluorescence promoting metal chamber and the detection chamber including a spectral excitation source and a means of measuring emission spectra from a sample, the detection chamber further connected to a waste chamber. A germination reaction mixture useful for promoting commitment of any viable bacterial spores in a sample including a combination of L-alanine, L-asparagine and D-glucose is also described.

Vanderberg, Laura A.; Herdendorf, Timothy J.; Obiso, Richard J.

2003-07-29

432

Near real-time skin deformation mapping  

NASA Astrophysics Data System (ADS)

A novel in vivo approach is described that provides large area mapping of the mechanical properties of the skin in human patients. Such information is important in the understanding of skin health, cosmetic surgery[1], aging, and impacts of sun exposure. Currently, several methods have been developed to estimate the local biomechanical properties of the skin, including the use of a physical biopsy of local areas of the skin (in vitro methods) [2, 3, and 4], and also the use of non-invasive methods (in vivo) [5, 6, and 7]. All such methods examine localized areas of the skin. Our approach examines the local elastic properties via the generation of field displacement maps of the skin created using time-sequence imaging [9] with 2D digital imaging correlation (DIC) [10]. In this approach, large areas of the skin are reviewed rapidly, and skin displacement maps are generated showing the contour maps of skin deformation. These maps are then used to precisely register skin images for purposes of diagnostic comparison. This paper reports on our mapping and registration approach, and demonstrates its ability to accurately measure the skin deformation through a described nulling interpolation process. The result of local translational DIC alignment is compared using this interpolation process. The effectiveness of the approach is reported in terms of residual RMS, image entropy measures, and differential segmented regional errors.

Kacenjar, Steve; Chen, Suzie; Jafri, Madiha; Wall, Brian; Pedersen, Richard; Bezozo, Richard

2013-02-01

433

Designing a fuzzy scheduler for hard real-time systems  

NASA Technical Reports Server (NTRS)

In hard real-time systems, tasks have to be performed not only correctly, but also in a timely fashion. If timing constraints are not met, there might be severe consequences. Task scheduling is the most important problem in designing a hard real-time system, because the scheduling algorithm ensures that tasks meet their deadlines. However, the inherent nature of uncertainty in dynamic hard real-time systems increases the problems inherent in scheduling. In an effort to alleviate these problems, we have developed a fuzzy scheduler to facilitate searching for a feasible schedule. A set of fuzzy rules are proposed to guide the search. The situation we are trying to address is the performance of the system when no feasible solution can be found, and therefore, certain tasks will not be executed. We wish to limit the number of important tasks that are not scheduled.

Yen, John; Lee, Jonathan; Pfluger, Nathan; Natarajan, Swami

1992-01-01

434

A real-time fast radio burst: polarization detection and multiwavelength follow-up  

NASA Astrophysics Data System (ADS)

Fast radio bursts (FRBs) are one of the most tantalizing mysteries of the radio sky; their progenitors and origins remain unknown and until now no rapid multiwavelength follow-up of an FRB has been possible. New instrumentation has decreased the time between observation and discovery from years to seconds, and enables polarimetry to be performed on FRBs for the first time. We have discovered an FRB (FRB 140514) in real-time on 2014 May 14 at 17:14:11.06 UTC at the Parkes radio telescope and triggered follow-up at other wavelengths within hours of the event. FRB 140514 was found with a dispersion measure (DM) of 562.7(6) cm-3 pc, giving an upper limit on source redshift of z ? 0.5. FRB 140514 was found to be 21 ± 7 per cent (3?) circularly polarized on the leading edge with a 1? upper limit on linear polarization <10 per cent. We conclude that this polarization is intrinsic to the FRB. If there was any intrinsic linear polarization, as might be expected from coherent emission, then it may have been depolarized by Faraday rotation caused by passing through strong magnetic fields and/or high-density environments. FRB 140514 was discovered during a campaign to re-observe known FRB fields, and lies close to a previous discovery, FRB 110220; based on the difference in DMs of these bursts and time-on-sky arguments, we attribute the proximity to sampling bias and conclude that they are distinct objects. Follow-up conducted by 12 telescopes observing from X-ray to radio wavelengths was unable to identify a variable multiwavelength counterpart, allowing us to rule out models in which FRBs originate from nearby (z < 0.3) supernovae and long duration gamma-ray bursts.

Petroff, E.; Bailes, M.; Barr, E. D.; Barsdell, B. R.; Bhat, N. D. R.; Bian, F.; Burke-Spolaor, S.; Caleb, M.; Champion, D.; Chandra, P.; Da Costa, G.; Delvaux, C.; Flynn, C.; Gehrels, N.; Greiner, J.; Jameson, A.; Johnston, S.; Kasliwal, M. M.; Keane, E. F.; Keller, S.; Kocz, J.; Kramer, M.; Leloudas, G.; Malesani, D.; Mulchaey, J. S.; Ng, C.; Ofek, E. O.; Perley, D. A.; Possenti, A.; Schmidt, B. P.; Shen, Yue; Stappers, B.; Tisserand, P.; van Straten, W.; Wolf, C.

2015-02-01

435

Reference genes in real-time PCR.  

PubMed

This paper aims to discuss various aspects of the use of reference genes in qPCR technique used in the thousands of present studies. Most frequently, these are housekeeping genes and they must meet several criteria so that they can lay claim to the name. Lots of papers report that in different conditions, for different organisms and even tissues the basic assumption—the constant level of the expression is not maintained for many genes that seem to be perfect candidates. Moreover, their transcription can not be affected by experimental factors. Sounds simple and clear but a great number of designed protocols and lack of consistency among them brings confusion on how to perform experiment properly. Since during selection of the most stable normalizing gene we can not use any reference gene, different ways and algorithms for their selection were developed. Such methods, including examples of best normalizing genes in some specific cases and possible mistakes are presented based on available sources. Numerous examples of reference genes applications, which are usually in too few numbers in relevant articles not allowing to make a solid fundament for a reader, will be shown along with instructive compilations to make an evidence for presented statements and an arrangement of future qPCR experiments. To include all the pitfalls and problems associated with the normalization methods there is no way not to begin from sample preparation and its storage going through candidate gene selection, primer design and statistical analysis. This is important because numerous short reviews available cover the topic only in lesser extent at the same time giving the reader false conviction of complete topic recognition. PMID:24078518

Kozera, Bart?omiej; Rapacz, Marcin

2013-11-01

436

Faraday rotation system  

NASA Astrophysics Data System (ADS)

The Faraday Rotation System (FRS) is one of the advanced laser-based diagnostics developed at DIAL to provide support for the demonstration of prototype-scale coal-fired combustion magnetohydrodynamic (MHD) electrical power generation. Intended for application in the MHD channel, the system directly measures electron density through a measurement of the induced rotation in the polarization of a far infrared laser beam after passing through the MHD flow along the magnetic field lines. A measurement of the induced polarization ellipticity provides a measure of the electron collision frequency which together with the electron density gives the electron conductivity, a crucial parameter for MHD channel performance. The theory of the measurements, a description of the system, its capabilities, laboratory demonstration measurements on seeded flames with comparison to emission absorption measurements, and the current status of the system are presented in this final report.

Bauman, L. E.; Wang, W.

437

Real-Time Tropospheric Delay Estimation using IGS Products  

NASA Astrophysics Data System (ADS)

The Federal Agency for Cartography and Geodesy (BKG) routinely provides zenith tropospheric delay (ZTD) parameter for the assimilation in numerical weather models since more than 10 years. Up to now the results flowing into the EUREF Permanent Network (EPN) or E-GVAP (EUMETNET EIG GNSS water vapour programme) analysis are based on batch processing of GPS+GLONASS observations in differential network mode. For the recently started COST Action ES1206 about "Advanced Global Navigation Satellite Systems tropospheric products for monitoring severe weather events and climate" (GNSS4SWEC), however, rapid updates in the analysis of the atmospheric state for nowcasting applications require changing the processing strategy towards real-time. In the RTCM SC104 (Radio Technical Commission for Maritime Services, Special Committee 104) a format combining the advantages of Precise Point Positioning (PPP) and Real-Time Kinematic (RTK) is under development. The so-called State Space Representation approach is defining corrections, which will be transferred in real-time to the user e.g. via NTRIP (Network Transport of RTCM via Internet Protocol). Meanwhile messages for precise orbits, satellite clocks and code biases compatible to the basic PPP mode using IGS products are defined. Consequently, the IGS Real-Time Service (RTS) was launched in 2013 in order to extend the well-known precise orbit and clock products by a real-time component. Further messages e.g. with respect to ionosphere or phase biases are foreseen. Depending on the level of refinement, so different accuracies up to the RTK level shall be reachable. In co-operation of BKG and the Technical University of Darmstadt the real-time software GEMon (GREF EUREF Monitoring) is under development. GEMon is able to process GPS and GLONASS observation and RTS product data streams in PPP mode. Furthermore, several state-of-the-art troposphere models, for example based on numerical weather prediction data, are implemented. Hence, it opens the possibility to evaluate the potential of troposphere parameter determination in real-time and its effect to Precise Point Positioning. Starting with an offline investigation of the influence of different RTS products and a priori troposphere models the configuration delivering the best results is used for a real-time processing of the GREF (German Geodetic Reference) network over a suitable period of time. The evaluation of the derived ZTD parameters and station heights is done with respect to well proven GREF, EUREF, IGS, and E-GVAP analysis results. Keywords: GNSS, Zenith Tropospheric Delay, Real-time Precise Point Positioning

Stürze, Andrea; Liu, Sha; Söhne, Wolfgang

2014-05-01

438

Faraday Discussions Vol 150 Frontiers in Spectroscopy  

E-print Network

, and chemistry. It is fitting to discuss this at a Faraday Meeting since Michael Faraday, the greatestFaraday Discussions Vol 150 Frontiers in Spectroscopy #12;Spectroscopy and astronomy: H3 + from Institute, the University of Chicago, Chicago, Illinois, 60637, USA. E-mail: t-oka@uchicago.edu PAPER www.rsc.org/faraday

Oka, Takeshi

439

Distributed RTEMS Prototyping for Hard Real-Time Systems  

NASA Astrophysics Data System (ADS)

This paper presents a software prototyping to accommodate RTEMS to any embedded multiprocessor architecture. It outlines the development effort to move this free kernel to a distributed system. The concern of such an approach is to uncouple application software from underlying hardware including network. A real test platform consists of two ERC32 boards linked through an Ethernet network. RTEMS validation is achieved thanks to functional tests and a hard real-time application.

Bossard, F.; Jouanneau, S.

2009-05-01

440

Real-time solving of dynamic problem in industrial robots  

Microsoft Academic Search

Purpose – The purpose of this paper is to present the development and validation of a methodology which allows modeling and solving the inverse and direct dynamic problem in real time in robot manipulators. Design\\/methodology\\/approach – The robot dynamic equation is based on the Gibbs-Appell equation of motion, yielding a well-structured set of equations that can be computed in real

Nuria Rosillo; Angel Valera; Francesc Benimeli; Vicente Mata; Francisco Valero

2011-01-01

441

A framework for building real-time expert systems  

NASA Technical Reports Server (NTRS)

The Space Station Freedom is an example of complex systems that require both traditional and artificial intelligence (AI) real-time methodologies. It was mandated that Ada should be used for all new software development projects. The station also requires distributed processing. Catastrophic failures on the station can cause the transmission system to malfunction for a long period of time, during which ground-based expert systems cannot provide any assistance to the crisis situation on the station. This is even more critical for other NASA projects that would have longer transmission delays (e.g., the lunar base, Mars missions, etc.). To address these issues, a distributed agent architecture (DAA) is proposed that can support a variety of paradigms based on both traditional real-time computing and AI. The proposed testbed for DAA is an autonomous power expert (APEX) which is a real-time monitoring and diagnosis expert system for the electrical power distribution system of the space station.

Lee, S. Daniel

1991-01-01

442

Multi-State Real-Time Bidirectional Search  

NASA Astrophysics Data System (ADS)

This paper presents Multi-State Real-Time Bidirectional Search (MSRTBS), a method that improves the efficiency of the heuristic search algorithm for finding approximate solutions. Real-Time A* (RTA*) is a representative heuristic search algorithm for finding approximate solutions. The Multi-State Commitment (MSC) method was introduced into RTA* and dramatically improved the performance in problems such as the N-puzzle. As well, Real-Time Bidirectional Search (RTBS) also improved RTA* by changing a unidirectional search into a bidirectional one. This paper proposed a method that introduces MSC into RTBS. The experimental results showed that compared with RTBS and MSC our proposed method, MSRTBS, improved executed time and solution quality in the N-Puzzle.

Koshino, Makoto; Murata, Hiroaki; Shirayama, Masatoshi; Kimura, Haruhiko

443

Real-Time Simulation of the X-33 Aerospace Engine  

NASA Technical Reports Server (NTRS)

This paper discusses the development and performance of the X-33 Aerospike Engine RealTime Model. This model was developed for the purposes of control law development, six degree-of-freedom trajectory analysis, vehicle system integration testing, and hardware-in-the loop controller verification. The Real-Time Model uses time-step marching solution of non-linear differential equations representing the physical processes involved in the operation of a liquid propellant rocket engine, albeit in a simplified form. These processes include heat transfer, fluid dynamics, combustion, and turbomachine performance. Two engine models are typically employed in order to accurately model maneuvering and the powerpack-out condition where the power section of one engine is used to supply propellants to both engines if one engine malfunctions. The X-33 Real-Time Model is compared to actual hot fire test data and is been found to be in good agreement.

Aguilar, Robert

1999-01-01

444

Real-Time Parameter Estimation Using Output Error  

NASA Technical Reports Server (NTRS)

Output-error parameter estimation, normally a post- ight batch technique, was applied to real-time dynamic modeling problems. Variations on the traditional algorithm were investigated with the goal of making the method suitable for operation in real time. Im- plementation recommendations are given that are dependent on the modeling problem of interest. Application to ight test data showed that accurate parameter estimates and un- certainties for the short-period dynamics model were available every 2 s using time domain data, or every 3 s using frequency domain data. The data compatibility problem was also solved in real time, providing corrected sensor measurements every 4 s. If uncertainty corrections for colored residuals are omitted, this rate can be increased to every 0.5 s.

Grauer, Jared A.

2014-01-01

445

Coordinated scheduling for dynamic real-time systems  

NASA Technical Reports Server (NTRS)

In this project, we addressed issues in coordinated scheduling for dynamic real-time systems. In particular, we concentrated on design and implementation of a new distributed real-time system called R-Shell. The design objective of R-Shell is to provide computing support for space programs that have large, complex, fault-tolerant distributed real-time applications. In R-shell, the approach is based on the concept of scheduling agents, which reside in the application run-time environment, and are customized to provide just those resource management functions which are needed by the specific application. With this approach, we avoid the need for a sophisticated OS which provides a variety of generalized functionality, while still not burdening application programmers with heavy responsibility for resource management. In this report, we discuss the R-Shell approach, summarize the achievement of the project, and describe a preliminary prototype of R-Shell system.

Natarajan, Swaminathan; Zhao, Wei

1994-01-01

446

Online gaming for learning optimal team strategies in real time  

NASA Astrophysics Data System (ADS)

This paper first presents an overall view for dynamical decision-making in teams, both cooperative and competitive. Strategies for team decision problems, including optimal control, zero-sum 2-player games (H-infinity control) and so on are normally solved for off-line by solving associated matrix equations such as the Riccati equation. However, using that approach, players cannot change their objectives online in real time without calling for a completely new off-line solution for the new strategies. Therefore, in this paper we give a method for learning optimal team strategies online in real time as team dynamical play unfolds. In the linear quadratic regulator case, for instance, the method learns the Riccati equation solution online without ever solving the Riccati equation. This allows for truly dynamical team decisions where objective functions can change in real time and the system dynamics can be time-varying.

Hudas, Gregory; Lewis, F. L.; Vamvoudakis, K. G.

2010-04-01

447

Development of real-time x-ray microtomography system  

NASA Astrophysics Data System (ADS)

We have developed a four-dimensional (4D) x-ray microcomputed tomography (CT) system that can obtain time-lapse CT volumes in real time. The system consists of a high-speed sample rotation system and a high-frame-rate x-ray imager, which are installed at a synchrotron radiation x-ray beamline. As a result of system optimization and introduction of a "zoom resolution" procedure, a real-time 4D CT movie with a frame rate of 30 was obtained with a voxel size of 2.5 ?m using 10 keV x-rays.

Takano, H.; Morikawa, M.; Konishi, S.; Azuma, H.; Shimomura, S.; Tsusaka, Y.; Nakano, S.; Kosaka, N.; Yamamoto, K.; Kagoshima, Y.

2013-10-01

448

Real Time Radiation Belt Data Assimilation using DREAM  

NASA Astrophysics Data System (ADS)

We present the first real-time version of the DREAM radiation belt data assimilation model. The model uses an "Ensemble Kalman Filter" to assimilate data in real time from inner magnetospheric spacecraft and computes Phase Space Density (PSD) as a functionof L* and time at contact first and second adiabatic invariants. Results using multiple pairs of first and second invariants are computed in order to recover flux versus energy along arbitrary spacecraft trajectories. The model can also be used to monitor the evolution of artificial electron injections and we show results using model inputs. We also present a visualization tool that can be used to examine the computed drift shells.

Henderson, M. G.; Koller, J.; Tokar, R. L.; Chen, Y.; Reeves, G. D.; Friedel, R. H.

2009-12-01

449

The improved broadband Real-Time Seismic Network in Romania  

NASA Astrophysics Data System (ADS)

Starting with 2002 the National Institute for Earth Physics (NIEP) has developed its real-time digital seismic network. This network consists of 96 seismic stations of which 48 broad band and short period stations and two seismic arrays are transmitted in real-time. The real time seismic stations are equipped with Quanterra Q330 and K2 digitizers, broadband seismometers (STS2, CMG40T, CMG 3ESP, CMG3T) and strong motions sensors Kinemetrics episensors (+/- 2g). SeedLink and AntelopeTM (installed on MARMOT) program packages are used for real-time (RT) data acquisition and exchange. The communication from digital seismic stations to the National Data Center in Bucharest is assured by 5 providers (GPRS, VPN, satellite communication, radio lease line and internet), which will assure the back-up communications lines. The processing centre runs BRTT's AntelopeTM 4.10 data acquisition and processing software on 2 workstations for real-time processing and post processing. The Antelope Real-Time System is also providing automatic event detection, arrival picking, event location and magnitude calculation. It provides graphical display and reporting within near-real-time after a local or regional event occurred. Also at the data center was implemented a system to collect macroseismic information using the internet on which macro seismic intensity maps are generated. In the near future at the data center will be install Seiscomp 3 data acquisition processing software on a workstation. The software will run in parallel with Antelope software as a back-up. The present network will be expanded in the near future. In the first half of 2009 NIEP will install 8 additional broad band stations in Romanian territory, which also will be transmitted to the data center in real time. The Romanian Seismic Network is permanently exchanging real -time waveform data with IRIS, ORFEUS and different European countries through internet. In Romania, magnitude and location of an earthquake are now available within a few minutes after the earthquake occurred. One of the greatest challenges in the near future is to provide shaking intensity maps and other ground motion parameters, within 5 minutes post-event, on the Internet and GIS-based format in order to improve emergency response, public information, preparedness and hazard mitigation

Neagoe, C.; Ionescu, C.

2009-04-01

450

High performance real-time flight simulation at NASA Langley  

NASA Technical Reports Server (NTRS)

In order to meet the stringent time-critical requirements for real-time man-in-the-loop flight simulation, computer processing operations must be deterministic and be completed in as short a time as possible. This includes simulation mathematical model computational and data input/output to the simulators. In 1986, in response to increased demands for flight simulation performance, personnel at NASA's Langley Research Center (LaRC), working with the contractor, developed extensions to a standard input/output system to provide for high bandwidth, low latency data acquisition and distribution. The Computer Automated Measurement and Control technology (IEEE standard 595) was extended to meet the performance requirements for real-time simulation. This technology extension increased the effective bandwidth by a factor of ten and increased the performance of modules necessary for simulator communications. This technology is being used by more than 80 leading technological developers in the United States, Canada, and Europe. Included among the commercial applications of this technology are nuclear process control, power grid analysis, process monitoring, real-time simulation, and radar data acquisition. Personnel at LaRC have completed the development of the use of supercomputers for simulation mathematical model computational to support real-time flight simulation. This includes the development of a real-time operating system and the development of specialized software and hardware for the CAMAC simulator network. This work, coupled with the use of an open systems software architecture, has advanced the state of the art in real time flight simulation. The data acquisition technology innovation and experience with recent developments in this technology are described.

Cleveland, Jeff I., II

1994-01-01

451

Operational real-time GPS-enhanced earthquake early warning  

NASA Astrophysics Data System (ADS)

Moment magnitudes for large earthquakes (Mw?7.0) derived in real time from near-field seismic data can be underestimated due to instrument limitations, ground tilting, and saturation of frequency/amplitude-magnitude relationships. Real-time high-rate GPS resolves the buildup of static surface displacements with the S wave arrival (assuming nonsupershear rupture), thus enabling the estimation of slip on a finite fault and the event's geodetic moment. Recently, a range of high-rate GPS strategies have been demonstrated on off-line data. Here we present the first operational system for real-time GPS-enhanced earthquake early warning as implemented at the Berkeley Seismological Laboratory (BSL) and currently analyzing real-time data for Northern California. The BSL generates real-time position estimates operationally using data from 62 GPS stations in Northern California. A fully triangulated network defines 170+ station pairs processed with the software trackRT. The BSL uses G-larmS, the Geodetic Alarm System, to analyze these positioning time series and determine static offsets and preevent quality parameters. G-larmS derives and broadcasts finite fault and magnitude information through least-squares inversion of the static offsets for slip based on a priori fault orientation and location information. This system tightly integrates seismic alarm systems (CISN-ShakeAlert, ElarmS-2) as it uses their P wave detections to trigger its processing; quality control runs continuously. We use a synthetic Hayward Fault earthquake scenario on real-time streams to demonstrate recovery of slip and magnitude. Reanalysis of the Mw7.2 El Mayor-Cucapah earthquake tests the impact of dynamic motions on offset estimation. Using these test cases, we explore sensitivities to disturbances of a priori constraints (origin time, location, and fault strike/dip).

Grapenthin, R.; Johanson, I. A.; Allen, R. M.

2014-10-01

452

Time Properties Verification Framework for UML-MARTE Safety Critical Real-Time Systems  

E-print Network

Time Properties Verification Framework for UML-MARTE Safety Critical Real-Time Systems Ning Ge for the reliability of Safety Critical Real-Time Systems (RTS). UML and MARTE are stan- dardized modelling languages). However, for- mal verification at early phases of the system lifecycle for UML-MARTE models remains mainly

Paris-Sud XI, Université de

453

Approximate Response Time for Fixed Priority Real-Time Systems with Energy-Harvesting  

E-print Network

Approximate Response Time for Fixed Priority Real-Time Systems with Energy-Harvesting Yasmina sufficient schedulability tests for fixed-priority pre-emptive scheduling of a real-time system under energy constraints. In this problem, energy is harvested from the ambient environment and used to replenish a storage

Boyer, Edmond

454

Removing Tetrahedra from manifold tetrahedralisation : application to real-time  

E-print Network

Removing Tetrahedra from manifold tetrahedralisation : application to real-time surgical simulation a large number of little and badly-shaped triangles or tetrahedra which increases the time of computation of tetrahedra from a tetrahedral- isation is the focus of this paper. Although this algorithm may seem trivial

Ayache, Nicholas

455

Sequential tests for near-real-time accounting  

SciTech Connect

Statistical hypothesis testing is used in the analysis of nuclear materials accounting data for evidence of diversion. Sequential hypothesis testing is particularly well suited for analyzing data that arise sequentially in time from near-real-time accounting systems. The properties of selected sequential tests adapted for this application are described. 10 figures, 12 tables.

Cobb, D.D.

1981-01-01

456

EE 4770: Real Time Computing Systems Room 2161 CEBA  

E-print Network

in The Course Hardware: · Sensors. For detecting light, temperature, etc. · Conditioning circuits's attention. Software: · Real-time software organization and features. · Estimating timing of RT programs. · Scheduling RT programs to meet deadlines. 01-2 EE 4770 Lecture Transparency. Formatted 14:10, 20 January 1998

Koppelman, David M.

457

Towards a Real›Time Multi›Agent System Architecture  

Microsoft Academic Search

Over the last few years, the application of the agent\\/multi- agent system paradigm seems appropriate for solving com- plex problems which require intelligence and bounded res- ponse times. This paper presents SIMBA: an architecture based on ARTIS agents as its main component for the deve- lopment of real-time multiagent systems. The ARTIS agent architecture guarantees an agent response that satises

Jose Soler; Vicente Julian; Miguel Rebollo; Carlos Carrascosa; Vicente Botti

458

A real time QRS complex classification method using Mahalanobis distance  

Microsoft Academic Search

An unsupervised method to recognize and classify QRS complexes was developed in order to create an automatic cardiac beat classifier in real time. After exhaustive analysis, four features extracted from the QRS complex in the time domain were selected as the ones presenting the best results: width, total sum of the areas under the positive and negative curves, total sum

J. C. T. B. Moraes; M. O. Seixas; F. N. Vilani; E. V. Costa

2002-01-01

459

Model Predictive Control for Real-Time Irrigation Scheduling  

E-print Network

Model Predictive Control for Real-Time Irrigation Scheduling S K Saleem D K Delgoda S K Ooi K B: Irrigation underpins agricultural productivity. The purpose of irrigation is to match water supply to crop water demand. The effectiveness of irrigation depends on the quality of the timing and duration

Halgamuge, Malka N.

460

UAV borne real-time road mapping system  

Microsoft Academic Search

Road information is useful in many fields. In this paper, a real-time mapping system is presented to acquire the image and determine the geometry of the road. These include designs of platform and instruments, data transmission, processing and archiving. Compare with the traditional platforms, the UAV (Unmanned Aerial Vehicle) platforms offer greater flexibility, shorter response time and is able to

Wang Feng; Wu Yundong; Zhang Qiang

2009-01-01

461

Real-Time Evolutionary Earthquake Location for Seismic Early Warning  

Microsoft Academic Search

An effective early-warning system must provide probabilistic estimates of the location and size of a potentially destructive earthquake within a few seconds after the event is first detected. In this work we present an evolutionary, real-time location technique based on an equal differential time (EDT) formulation and a probabilistic approach for describing the hypocenter estimation. The algorithm, at each timestep,

Claudio Satriano; Anthony Lomax; Aldo Zollo

2008-01-01

462

Implementing real-time robotic systems using CHIMERA II  

Microsoft Academic Search

The CHIMERA II programming environment and operating system, which was developed for implementing real-time robotic systems, is described. The CHIMERA II environment is designed to reduce the development time of applications by providing a convenient software interface between the hardware and the user. CHIMERA II supports flexible hardware configurations which are based on one or more VME backplanes. All communication

David B. Stewart; Donald E. Schmitz; P. K. Khosla

1990-01-01

463

A Java Processor Architecture for Embedded Real-Time Systems  

E-print Network

A Java Processor Architecture for Embedded Real-Time Systems Martin Schoeberl Institute of Computer conservative estimates. JOP (Java Optimized Processor) tackles this problem from the architectural perspective average case performance. This paper presents a Java processor designed for time-predictable execution

464

Optimized rapid prototyping for real-time embedded heterogeneous multiprocessors  

Microsoft Academic Search

This paper presents an enhancement of our "Algorithm ArchitectureAdequation" (AAA) prototyping methodology which allowsto rapidly develop and optimize the implementation of a reactivereal-time dataflow algorithm on a embedded heterogeneous multiprocessorarchitecture, predict its real-time behavior and automaticallygenerate the corresponding distributed and optimized staticexecutive. It describes a new optimization heuristic able to supportheterogeneous architectures and takes into...

Thierry Grandpierre; Christophe Lavarenne; Yves Sorel

1999-01-01

465

Speci cation and Analysis of Weakly Hard Real - Time Systems  

Microsoft Academic Search

Abstract A real - time system is one in which the temporal aspects of its behaviour are part of their speci cation The correctness of the system depends not only on the logical results of the computation, but also on the time at which the results are produced This is due to the fact that these systems are used to

G. Bernat

1998-01-01

466

Real-time pair-feeding of animals  

NASA Technical Reports Server (NTRS)

Automatic pair-feeding system was developed which immediately dispenses same amount of food to control animal as has been consumed by experimental animal that has free access to food. System consists of: master feeding system; slave feeding station; and control mechanism. Technique performs real time pair-feeding without attendant time lag.

Leon, H. A.; Connolly, J. P.; Hitchman, M. J.; Humbert, J. E.

1972-01-01

467

The Moon as a 'real-time' life sciences laboratory  

Microsoft Academic Search

A lunar life sciences laboratory would be an ideal learning center to develop science capabilities to extend humans to Mars. It could be initiated without a large amount of preparatory human research due to previous lunar experience, short flight time (3 days), and the ability to gather 'real time' life sciences data. Human studies can go beyond previous zero-g research

V. Garshnek

1994-01-01

468

A Practical Approach to Implementing Real-Time Semantics  

NASA Technical Reports Server (NTRS)

This paper investigates implementations of process algebras which are suitable for modeling concurrent real-time systems. It suggests an approach for efficiently implementing real-time semantics using dynamic priorities. For this purpose a proces algebra with dynamic priority is defined, whose semantics corresponds one-to-one to traditional real-time semantics. The advantage of the dynamic-priority approach is that it drastically reduces the state-space sizes of the systems in question while preserving all properties of their functional and real-time behavior. The utility of the technique is demonstrated by a case study which deals with the formal modeling and verification of the SCSI-2 bus-protocol. The case study is carried out in the Concurrency Workbench of North Carolina, an automated verification tool in which the process algebra with dynamic priority is implemented. It turns out that the state space of the bus-protocol model is about an order of magnitude smaller than the one resulting from real-time semantics. The accuracy of the model is proved by applying model checking for verifying several mandatory properties of the bus protocol.

Luettgen, Gerald; Bhat, Girish; Cleaveland, Rance

1999-01-01

469

Progress Towards the Real-Time International Reference Ionosphere  

NASA Astrophysics Data System (ADS)

The International Reference Ionosphere (IRI) model was developed as the empirical standard for specifying the densities and temperatures of the Earth's ionospheric plasma. IRI has been updated and improved as new data became available and as the dependencies on geophysical parameters became better understood. The latest version of the model, IRI-2012, introduces significant improvements and new model parameters. These advances will be briefly discussed. But the main topic of this presentation is the development of the Real-Time IRI. The standard IRI model provides monthly averages based on several solar and magnetic indices that are given as input parameters. It has long been the goal of the IRI team to establish a Real-Time IRI to assist the many users who require information about the actual (real-time) conditions in the ionosphere. Several updating and assimilatative approaches have been proposed to combine the IRI model with real-time measurements. Special workshos on this topic were held at the US Air Force Academy (Colorado Springs, USA) in April of 2009 and at the Institute of Atmospheric Physics (Prague, Czech Republic) in March 2012. We will discuss the outcome of these meetings and the status of the IRI Real-Time (IRI-RT) activities.

Bilitza, D.

2012-04-01

470

Spatio-temporal modeling for real-time ozone forecasting.  

PubMed

The accurate assessment of exposure to ambient ozone concentrations is important for informing the public and pollution monitoring agencies about ozone levels that may lead to adverse health effects. High-resolution air quality information can offer significant health benefits by leading to improved environmental decisions. A practical challenge facing the U.S. Environmental Protection Agency (USEPA) is to provide real-time forecasting of current 8-hour average ozone exposure over the entire conterminous United States. Such real-time forecasting is now provided as spatial forecast maps of current 8-hour average ozone defined as the average of the previous four hours, current hour, and predictions for the next three hours. Current 8-hour average patterns are updated hourly throughout the day on the EPA-AIRNow web site. The contribution here is to show how we can substantially improve upon current real-time forecasting systems. To enable such forecasting, we introduce a downscaler fusion model based on first differences of real-time monitoring data and numerical model output. The model has a flexible coefficient structure and uses an efficient computational strategy to fit model parameters. Our hybrid computational strategy blends continuous background updated model fitting with real-time predictions. Model validation analyses show that we are achieving very accurate and precise ozone forecasts. PMID:24010052

Paci, Lucia; Gelfand, Alan E; Holland, David M

2013-05-01

471

IGS Real-Time Service - Status And Future Developments  

NASA Astrophysics Data System (ADS)

The International GNSS Service (IGS) provides high quality products for a large variety of scientific and engineering GNSS applications. Well known post-processing results are satellite ephemeris and station coordinates in a global reference frame, Earth orientation and atmospheric parameters. With its Real-Time Service now the IGS extends its capability to support applications requiring real-time access to products. In this paper we introduce the latest status of the IGS Real-Time Service (IGS RTS) and describe its Initial Operational Capability (IOC). Components of the implemented infrastructure are described and an overview on available products and their usage is presented. The product quality is evaluated in view of applications such as real-time Precise Point Positioning (PPP). The plan is to declare Full Operational Capability (FOC) in 2014, as soon as the IGS Governing Board is satisfied with the accuracy and availability of the GNSS products. Hence the presentation closes with an outlook on progress towards real-time multi-GNSS in IGS.

Rülke, Axel; Agrotis, Loukis; Caissy, Mark; Habrich, Heinz; Neumaier, Peter; Söhne, Wolfgang; Weber, Georg

2014-05-01

472

Toward real-time performance benchmarks for Ada  

NASA Technical Reports Server (NTRS)

The issue of real-time performance measurements for the Ada programming language through the use of benchmarks is addressed. First, the Ada notion of time is examined and a set of basic measurement techniques are developed. Then a set of Ada language features believed to be important for real-time performance are presented and specific measurement methods discussed. In addition, other important time related features which are not explicitly part of the language but are part of the run-time related features which are not explicitly part of the language but are part of the run-time system are also identified and measurement techniques developed. The measurement techniques are applied to the language and run-time system features and the results are presented.

Clapp, Russell M.; Duchesneau, Louis; Volz, Richard A.; Mudge, Trevor N.; Schultze, Timothy

1986-01-01

473

Optical mapping system with real-time control capability.  

PubMed

Real-time, closed-loop intervention is an emerging experiment-control method that promises to provide invaluable new insight into cardiac electrophysiology. One example is the investigation of closed-loop feedback control of cardiac activity (e.g., alternans) as a possible method of preventing arrhythmia onset. To date, such methods have been investigated only in vitro using microelectrode systems, which are hindered by poor spatial resolution and are not well suited for atrial or ventricular tissue preparations. We have developed a system that uses optical mapping techniques and an electrical stimulator as the sensory and effector arms, respectively, of a closed-loop, real-time control system. The system consists of a 2,048 x 1 pixel line-scan charge-coupled device camera that records optical signals from the tissue. Custom-image processing and control software, which is implemented on top of a hard real-time operation system (RTAI Linux), process the data and make control decisions with a deterministic delay of <1 ms. The system is tested in two ways: 1) it is used to control, in real time, simulated optical signals of electrical alternans; and 2) it uses precisely timed, feedback-controlled initiation of antitachycardia pacing to terminate reentrant arrhythmias in an arterially perfused swine right ventricle stained with voltage-sensitive fluorescent dye 4{beta-[2-(di-n-butylamino)-6-napathy]vinyl}pyridinium (di-4-ANEPPS). Thus real-time control of cardiac activity using optical mapping techniques is feasible. Such a system is attractive because it offers greater measurement resolution than the electrode-based systems with which real-time control has been used previously. PMID:17644571

Iravanian, Shahriar; Christini, David J

2007-10-01

474

Toward Real Time Data Analysis for Smart Grids  

SciTech Connect

This paper describes the architecture and design of a novel system for supporting large-scale real-time data analysis for future power grid systems. The widespread deployment of renewable generation, smart grid controls, energy storage, plug-in hybrids, and new conducting materials will require fundamental changes in the operational concepts and principal components of the grid. As a result, the whole system becomes highly dynamic and requires constant adjusting based on real time data. Even though millions of sensors such as phase measurement units (PMU) and smart meters are being widely deployed, a data layer that can analyze this amount of data in real time is needed. Unlike the data fabric in other cloud services, the data layer for smart grids has some unique design requirements. First, this layer must provide real time guarantees. Second, this layer must be scalable to allow a large number of applications to access the data from millions of sensors in real time. Third, reliability is critical and this layer must be able to continue to provide service in face of failures. Fourth, this layer must be secure. We address these challenges though a scalable system architecture that integrates the I/O and data processing capability in a devise set of devices. Data process operations can be placed anywhere from sensors, data storage devices, to control centers. We further employ compression to improve performance. We design a lightweight compression customized for power grid data. Our system can reduce end-to-end response time by reduce I/O overhead through compression and overlap compression operations with I/O. The initial prototype of our system was demonstrated with several use cases from PNNL’s FPGI and show that our system can provide real time guarantees to a diverse set of applications.

Yin, Jian; Gorton, Ian; Sharma, Poorva

2012-11-10

475

Guaranteed Response Times in a Hard-Real-Time Environment  

Microsoft Academic Search

This paper describes a scheduling algorithm for a set of tasks that guarantees the time within which a task, once started, will complete. A task is started upon receipt of an external signal or the completion of other tasks. Each task has a rxed set of requirements in processor time, resources, and device operations needed for completion of its various

Dennis W. Leinbaugh

1980-01-01

476

Distributed simulation using a real-time shared memory network  

NASA Technical Reports Server (NTRS)

The Advanced Control Technology Branch of the NASA Lewis Research Center performs research in the area of advanced digital controls for aeronautic and space propulsion systems. This work requires the real-time implementation of both control software and complex dynamical models of the propulsion system. We are implementing these systems in a distributed, multi-vendor computer environment. Therefore, a need exists for real-time communication and synchronization between the distributed multi-vendor computers. A shared memory network is a potential solution which offers several advantages over other real-time communication approaches. A candidate shared memory network was tested for basic performance. The shared memory network was then used to implement a distributed simulation of a ramjet engine. The accuracy and execution time of the distributed simulation was measured and compared to the performance of the non-partitioned simulation. The ease of partitioning the simulation, the minimal time required to develop for communication between the processors and the resulting execution time all indicate that the shared memory network is a real-time communication technique worthy of serious consideration.

Simon, Donald L.; Mattern, Duane L.; Wong, Edmond; Musgrave, Jeffrey L.

1993-01-01

477

Continuous real-time water information: an important Kansas resource  

USGS Publications Warehouse

Continuous real-time information on streams, lakes, and groundwater is an important Kansas resource that can safeguard lives and property, and ensure adequate water resources for a healthy State economy. The U.S. Geological Survey (USGS) operates approximately 230 water-monitoring stations at Kansas streams, lakes, and groundwater sites. Most of these stations are funded cooperatively in partnerships with local, tribal, State, or other Federal agencies. The USGS real-time water-monitoring network provides long-term, accurate, and objective information that meets the needs of many customers. Whether the customer is a water-management or water-quality agency, an emergency planner, a power or navigational official, a farmer, a canoeist, or a fisherman, all can benefit from the continuous real-time water information gathered by the USGS.

Loving, Brian L.; Putnam, James E.; Turk, Donita M.

2014-01-01

478

Real-time simulations for automated rendezvous and capture  

NASA Technical Reports Server (NTRS)

Although the individual technologies for automated rendezvous and capture (AR&C) exist, they have not yet been integrated to produce a working system in the United States. Thus, real-time integrated systems simulations are critical to the development and pre-flight demonstration of an AR&C capability. Real-time simulations require a level of development more typical of a flight system compared to purely analytical methods, thus providing confidence in derived design concepts. This presentation will describe Martin Marietta's Space Operations Simulation (SOS) Laboratory, a state-of-the-art real-time simulation facility for AR&C, along with an implementation for the Satellite Servicer System (SSS) Program.

Cuseo, John A.

1991-01-01

479

Real-Time Parameter Estimation in the Frequency Domain  

NASA Technical Reports Server (NTRS)

A method for real-time estimation of parameters in a linear dynamic state-space model was developed and studied. The application is aircraft dynamic model parameter estimation from measured data in flight. Equation error in the frequency domain was used with a recursive Fourier transform for the real-time data analysis. Linear and nonlinear simulation examples and flight test data from the F-18 High Alpha Research Vehicle were used to demonstrate that the technique produces accurate model parameter estimates with appropriate error bounds. Parameter estimates converged in less than one cycle of the dominant dynamic mode, using no a priori information, with control surface inputs measured in flight during ordinary piloted maneuvers. The real-time parameter estimation method has low computational requirements and could be implemented

Morelli, Eugene A.

2000-01-01

480

Parallel architecture for real-time simulation. Master's thesis  

SciTech Connect

This thesis is concerned with the development of a very fast and highly efficient parallel computer architecture for real-time simulation of continuous systems. Currently, several parallel processing systems exist that may be capable of executing a complex simulation in real-time. These systems are examined and the pros and cons of each system discussed. The thesis then introduced a custom-designed parallel architecture based upon The University of Alabama's OPERA architecture. Each component of this system is discussed and rationale presented for its selection. The problem selected, real-time simulation of the Space Shuttle Main Engine for the test and evaluation of the proposed architecture, is explored, identifying the areas where parallelism can be exploited and parallel processing applied. Results from the test and evaluation phase are presented and compared with the results of the same problem that has been processed on a uniprocessor system.

Cockrell, C.D.

1989-01-01

481

Real-time myocardial segmentation using coupled active geometric functions.  

PubMed

Myocardial segmentation is essential for quantitative evaluation of cardiac functional images. As imaging techniques advance, 3D and 4D image data have become available. These data can provide clinically important cardiac dynamic information at high spatial or temporal resolution. However, the enormous amount of information contained in these data has also raised a challenge for traditional image analysis algorithms in terms of efficiency and clinical workflow. In this context, an automated real-time myocardial segmentation framework based on coupled Active Geometric Functions was proposed and tested on 414 frames of Phase Train Imaging data, a real-time cardiac MR imaging technique, with an average temporal resolution of 2 ms. The performance of myocardial segmentation was visually and quantitatively validated. Implemented in Matlab(c), the current method takes less than 1.2 ms per cardiac phase, allowing realization of true real-time online segmentation. PMID:19163435

Duan, Qi; Laine, Andrew F; Pai, Vinay M

2008-01-01

482

Real-time structured light intraoral 3D measurement pipeline  

NASA Astrophysics Data System (ADS)

Computer aided design and manufacturing (CAD/CAM) is increasingly becoming a standard feature and service provided to patients in dentist offices and denture manufacturing laboratories. Although the quality of the tools and data has slowly improved in the last years, due to various surface measurement challenges, practical, accurate, invivo, real-time 3D high quality data acquisition and processing still needs improving. Advances in GPU computational power have allowed for achieving near real-time 3D intraoral in-vivo scanning of patient's teeth. We explore in this paper, from a real-time perspective, a hardware-software-GPU solution that addresses all the requirements mentioned before. Moreover we exemplify and quantify the hard and soft deadlines required by such a system and illustrate how they are supported in our implementation.

Gheorghe, Radu; Tchouprakov, Andrei; Sokolov, Roman

2013-02-01

483

Real-time experiment interface for biological control applications.  

PubMed

The Real-time Experiment Interface (RTXI) is a fast and versatile real-time biological experimentation system based on Real-Time Linux. RTXI is open source and free, can be used with an extensive range of experimentation hardware, and can be run on Linux or Windows computers (when using the Live CD). RTXI is currently used extensively for two experiment types: dynamic patch clamp and closed-loop stimulation pattern control in neural and cardiac single cell electrophysiology. RTXI includes standard plug-ins for implementing commonly used electrophysiology protocols with synchronized stimulation, event detection, and online analysis. These and other user-contributed plug-ins can be found on the website (http://www.rtxi.org). PMID:21096883

Lin, Risa J; Bettencourt, Jonathan; Wha Ite, John; Christini, David J; Butera, Robert J

2010-01-01

484

Test applications for heterogeneous real-time network testbed  

SciTech Connect

This paper investigates several applications for a heterogeneous real-time network testbed. The network is heterogeneous in terms of network devices, technologies, protocols, and algorithms. The network is real-time in that its services can provide per-connection end-to-end performance guarantees. Although different parts of the network use different algorithms, all components have the necessary mechanisms to provide performance guarantees: admission control and priority scheduling. Three applications for this network are described in this paper: a video conferencing tool, a tool for combustion modeling using distributed computing, and an MPEG video archival system. Each has minimum performance requirements that must be provided by the network. By analyzing these applications, we provide insights to the traffic characteristics and performance requirements of practical real-time loads.

Mines, R.F.; Knightly, E.W.

1994-07-01

485

Training recurrent neurocontrollers for real-time applications.  

PubMed

In this paper, we introduce a new approach to train recurrent neurocontrollers for real-time applications. We begin with training a recurrent neurocontroller for robustness on high-fidelity models of physical systems. For training, we use a recently developed derivative-free Kalman filter method which we enhance for controller training. After training, we fix weights of our recurrent neurocontroller and deploy it in an embedded environment. Then, we carry out additional training of the neurocontroller by adapting in real time its internal state (short-term memory), rather than its weights (long-term memory). Such real-time training is done with a new combination of simultaneous perturbation stochastic approximation (SPSA) and adaptive critic. Our critic is also a recurrent neural network (RNN), and it is trained by stochastic meta-descent (SMD) for increased efficiency. Our approach is applied to two important practical problems, electronic throttle control and hybrid electric vehicle control, with apparent performance improvement. PMID:17668657

Prokhorov, Danil V

2007-07-01

486

Advances in MWD technology improve real time data  

SciTech Connect

This paper reports that improvements in measurement while drilling (MWD) technology have increased drilling efficiency by allowing the driller to steer the bit with real-time formation evaluation measurements and to optimize bottom hole assembly (BHA) performance during drilling. Significant advances in MWD will come in a viable market that values real-time downhole measurements not only as a replacement for conventional measurements, but also as a means to optimize drilling and increase recoverable reserves. MWD technology will center on improving the real-time capabilities of geosteering, moving sensors closer to the bit, and reducing the length of the entire BHA. The key to success is careful planning, cross training for MWD engineers and directional drillers, and a well-prepared team that includes the operator's representative, well site geologist, driller, and reservoir engineer.

Brugess, T.; Voisin, B. (Anadrill Schlumberger, Sugar Land, TX (US))

1992-02-17

487

SPARSE FARADAY ROTATION MEASURE SYNTHESIS  

SciTech Connect

Faraday rotation measure synthesis is a method for analyzing multichannel polarized radio emissions, and it has emerged as an important tool in the study of Galactic and extragalactic magnetic fields. The method requires the recovery of the Faraday dispersion function from measurements restricted to limited wavelength ranges, which is an ill-conditioned deconvolution problem. Here, we discuss a recovery method that assumes a sparse approximation of the Faraday dispersion function in an overcomplete dictionary of functions. We discuss the general case when both thin and thick components are included in the model, and we present the implementation of a greedy deconvolution algorithm. We illustrate the method with several numerical simulations that emphasize the effect of the covered range and sampling resolution in the Faraday depth space, and the effect of noise on the observed data.

Andrecut, M.; Stil, J. M.; Taylor, A. R. [Institute for Space Imaging Science, Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4 (Canada)

2012-02-15

488

Faraday imaging at high temperatures  

DOEpatents

A Faraday filter rejects background light from self-luminous thermal objects, but transmits laser light at the passband wavelength, thus providing an ultra-narrow optical bandpass filter. The filter preserves images so a camera looking through a Faraday filter at a hot target illuminated by a laser will not see the thermal radiation but will see the laser radiation. Faraday filters are useful for monitoring or inspecting the uranium separator chamber in an atomic vapor laser isotope separation process. Other uses include viewing welds, furnaces, plasma jets, combustion chambers, and other high temperature objects. These filters are can be produced at many discrete wavelengths. A Faraday filter consists of a pair of crossed polarizers on either side of a heated vapor cell mounted inside a solenoid.

Hackel, Lloyd A. (Livermore, CA); Reichert, Patrick (Hayward, CA)

1997-01-01

489

Faraday imaging at high temperatures  

DOEpatents

A Faraday filter rejects background light from self-luminous thermal objects, but transmits laser light at the passband wavelength, thus providing an ultra-narrow optical bandpass filter. The filter preserves images so a camera looking through a Faraday filter at a hot target illuminated by a laser will not see the thermal radiation but will see the laser radiation. Faraday filters are useful for monitoring or inspecting the uranium separator chamber in an atomic vapor laser isotope separation process. Other uses include viewing welds, furnaces, plasma jets, combustion chambers, and other high temperature objects. These filters are can be produced at many discrete wavelengths. A Faraday filter consists of a pair of crossed polarizers on either side of a heated vapor cell mounted inside a solenoid. 3 figs.

Hackel, L.A.; Reichert, P.

1997-03-18

490

Simultaneous real-time monitoring of multiple cortical systems  

NASA Astrophysics Data System (ADS)

Objective. Real-time monitoring of the brain is potentially valuable for performance monitoring, communication, training or rehabilitation. In natural situations, the brain performs a complex mix of various sensory, motor or cognitive functions. Thus, real-time brain monitoring would be most valuable if (a) it could decode information from multiple brain systems simultaneously, and (b) this decoding of each brain system were robust to variations in the activity of other (unrelated) brain systems. Previous studies showed that it is possible to decode some information from different brain systems in retrospect and/or in isolation. In our study, we set out to determine whether it is possible to simultaneously decode important information about a user from different brain systems in real time, and to evaluate the impact of concurrent activity in different brain systems on decoding performance. Approach. We study these questions using electrocorticographic signals recorded in humans. We first document procedures for generating stable decoding models given little training data, and then report their use for offline and for real-time decoding from 12 subjects (six for offline parameter optimization, six for online experimentation). The subjects engage in tasks that involve movement intention, movement execution and auditory functions, separately, and then simultaneously. Main results. Our real-time results demonstrate that our system can identify intention and movement periods in single trials with an accuracy of 80.4% and 86.8%, respectively (where 50% would be expected by chance). Simultaneously, the decoding of the power envelope of an auditory stimulus resulted in an average correlation coefficient of 0.37 between the actual and decoded power envelopes. These decoders were trained separately and executed simultaneously in real time. Significance. This study yielded the first demonstration that it is possible to decode simultaneously the functional activity of multiple independent brain systems. Our comparison of univariate and multivariate decoding strategies, and our analysis of the influence of their decoding parameters, provides benchmarks and guidelines for future research on this topic.

Gupta, Disha; Hill, N. Jeremy; Brunner, Peter; Gunduz, Aysegul; Ritaccio, Anthony L.; Schalk, Gerwin

2014-10-01

491

Real-Time WINDMI Predictions of Geomagnetic Storm and Substorms  

NASA Astrophysics Data System (ADS)

Real-Time WINMDI is plasma physics-based, nonlinear dynamical model of the coupled solar WIND Magentosphere-Ionosphere system. Using upstream solar wind particle and field data, a system of nonlinear ordinary differential equations is solved numerically to describe the energy transfer from the solar wind to the magnetosphere-ionosphere system. The physics model WINMDI divides the incoming power into energy stored in multiple regions of M-I system and has been verified on GEM storm data in Spencer et al. (2007). The system of nonlinear ordinary differential equations, which describes energy transfer into, and between dominant components of the nightside magnetosphere and ionosphere, is solved numerically to determine the state of each component. The low-dimensional model characterizes the energy stored in the ring current and the region 1 field-aligned current which are use to compute model Dst and AL values. Real-time solar wind plasma parameters, available from ACE, are downloaded every 10 minutes to compute the input solar wind driving voltage for the model. Real-Time WINDMI computes model Dst and AL values about 1-2 hours before index data is available at the Kyoto WDC Quicklook website. Results are shown on the Real-Time WINDMI website. We present statistics for Real-Time WINDMI performance from 2006 to present and also compare the results for different input driving voltages. We plan to compare the database of Real-Time WINDMI Dst predictions with other ring current models which contain different loss and energization processes. The work is supported by NSF grant ATM-0638480.

Mays, M. L.; Horton, W.; Spencer, E.; Kozyra, J. U.

2008-12-01

492

Heterodyne-enhanced Faraday rotation spectrometer  

NASA Astrophysics Data System (ADS)

A novel heterodyne-enhanced Faraday rotation spectroscopic (H-FRS) system for trace gas detection of nitric oxide (NO) is demonstrated. The system is based on a quantum cascade laser emitting at ~5.2 ?m and a mercury cadmium telluride photodetector (both thermoelectrically cooled). The heterodyne detection is performed at 30MHz, where the laser relative intensity noise is significantly smaller than at low frequencies. With an implementation of active interferometer stabilization technique, the current system shows total noise level that is only 5.4 times above the fundamental shot-noise limit and the Faraday rotation angle sensitivity of 2.6 × 10-8 rad/?Hz. The NO detection limit of 30.7 ppb-v/?Hz was achieved for the R(8.5)e NO transition using 100 Gauss magnetic field and 0.15 m optical path length.

Wang, Yin; Nikodem, Michal; Hoyne, Jake; Wysocki, Gerard

2012-01-01

493

Faraday rotation assisted by linearly polarized light  

SciTech Connect

We demonstrate a type of chiral effect of an atomic medium. Polarization rotation of a probe beam is observed only when both a magnetic field and a linearly polarized coupling beam are present. We compare it with other chiral effects like optical activity, the Faraday effect, and the optically induced Faraday effect from the viewpoint of spatial inversion and time reversal transformations. As a theoretical model we consider a five-level configuration involving the cesium D2 transition. We use spin-polarized cold cesium atoms trapped in a magneto-optical trap to measure the polarization rotation versus probe detuning. The result shows reasonable agreement with a calculation from the master equation of the five-level configuration.

Choi, Jai Min; Kim, Jang Myun; Cho, D. [Department of Physics, Korea University, Seoul 136-713 (Korea, Republic of)

2007-11-15

494

23 CFR 511.313 - Metropolitan Area real-time information program supplement.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 false Metropolitan Area real-time information program supplement. 511.313...TRANSPORTATION INFRASTRUCTURE MANAGEMENT REAL-TIME SYSTEM MANAGEMENT INFORMATION PROGRAM Real-Time System Management Information Program §...

2013-04-01

495

23 CFR 511.313 - Metropolitan Area real-time information program supplement.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 false Metropolitan Area real-time information program supplement. 511.313...TRANSPORTATION INFRASTRUCTURE MANAGEMENT REAL-TIME SYSTEM MANAGEMENT INFORMATION PROGRAM Real-Time System Management Information Program §...

2011-04-01

496

23 CFR 511.313 - Metropolitan Area real-time information program supplement.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 false Metropolitan Area real-time information program supplement. 511.313...TRANSPORTATION INFRASTRUCTURE MANAGEMENT REAL-TIME SYSTEM MANAGEMENT INFORMATION PROGRAM Real-Time System Management Information Program §...

2012-04-01

497

23 CFR 511.313 - Metropolitan Area real-time information program supplement.  

Code of Federal Regulations, 2014 CFR

...2014-04-01 false Metropolitan Area real-time information program supplement. 511.313...TRANSPORTATION INFRASTRUCTURE MANAGEMENT REAL-TIME SYSTEM MANAGEMENT INFORMATION PROGRAM Real-Time System Management Information Program §...

2014-04-01

498

Integration of Real-Time Data Into Building Automation Systems  

SciTech Connect

The project goal was to investigate the possibility of using predictive real-time information from the Internet as an input to building management system algorithms. The objectives were to identify the types of information most valuable to commercial and residential building owners, managers, and system designers. To comprehensively investigate and document currently available electronic real-time information suitable for use in building management systems. Verify the reliability of the information and recommend accreditation methods for data and providers. Assess methodologies to automatically retrieve and utilize the information. Characterize equipment required to implement automated integration. Demonstrate the feasibility and benefits of using the information in building management systems. Identify evolutionary control strategies.

Mark J. Stunder; Perry Sebastian; Brenda A. Chube; Michael D. Koontz

2003-04-16

499

Real-time face tracking and recognition for video conferencing  

NASA Astrophysics Data System (ADS)

This paper describes a system of vision in real time, allowing to detect automatically the faces presence, to localize and to follow them in video sequences. We verify also the faces identities. These processes are based by combining technique of image processing and methods of neural networks. The tracking is realized with a strategy of prediction-verification using the dynamic information of the detection. The system has been evaluated quantitatively on 8 video sequences. The robustness of the method has been tested on various lightings images. We present also the analysis of complexity of this algorithm in order to realize an implementation in real time on a FPGA based architecture.

Malasne, Nicolas; Yang, Fan; Paindavoine, Michel

2001-11-01

500

ARTEMIS: Ares Real Time Environments for Modeling, Integration, and Simulation  

NASA Technical Reports Server (NTRS)

This slide presentation reviews the use of ARTEMIS in the development and testing of the ARES launch vehicles. Ares Real Time Environment for Modeling, Simulation and Integration (ARTEMIS) is the real time simulation supporting Ares I hardware-in-the-loop (HWIL) testing. ARTEMIS accurately models all Ares/Orion/Ground subsystems which interact with Ares avionics components from pre-launch through orbit insertion The ARTEMIS System integration Lab, and the STIF architecture is reviewed. The functional components of ARTEMIS are outlined. An overview of the models and a block diagram is presented.

Hughes, Ryan; Walker, David

2009-01-01