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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 Databases  

Microsoft Academic Search

Data in real-time databases has to be logically consistent as well as temporally consistent. The latter arises from the need to preserve the temporal validity of data items that reflect the state of the environment that is being controlled by the system. Some of the timing constraints on the transactions that process real-time data come from this need. These constraints,

Krithi Ramamritham

1993-01-01

3

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

4

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

5

"Making it real" time.  

PubMed

It has been 30 years since the first description of the polymerase chain reaction (PCR)--corresponding, coincidentally, with the year of the first issue of BioTechniques. Ensuing decades have seen remarkable advances in this revolutionary technique. Central to these approaches was the creation of paradigms for monitoring the progress of PCR amplification in real time. One of these seminal reports appeared in BioTechniques in 1997, establishing the double-strand-specific dye SYBR Green as a workhorse tool for continuous monitoring of DNA amplification. PMID:23905171

Vrana, Kent E

2013-06-01

6

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

7

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

8

Real-Time Operating Systems  

Microsoft Academic Search

\\u000a This section is devoted to real-time operating systems (RTOS) for supporting applications with real-time requirements. In\\u000a these applications, most real-time requirements are derived form the physics of the environment that is being controlled or\\u000a monitored and this implies that most real-time systems are embedded computer systems, and that an RTOS has to provide facilities\\u000a for supporting embedded applications. There are

Bruno Bouyssounouse; Joseph Sifakis

9

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

10

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

11

Translating Real-Time UML Timing Constraints into Real-Time Logic Formulas  

E-print Network

and the Institute for Space Systems Operations. #12;1 Translating Real-Time UML Timing Constraints into Real-Time and Albert Mo Kim Cheng Real-Time Systems Laboratory Department of Computer Science University of Houston Modeling, Real-Time Systems, Timing Constraints, Verification, RTL Abstract Real-time software development

Cheng, Albert M. K.

12

Faraday’s law paradoxes  

E-print Network

We are taught in elementary physics (Halliday and Resnick 1960) that Faraday’s law gives the relation between the potential difference V induced in a closed circuit and the rate of change of magnetic flux CP over any area bounded by that circuit as

A Nussbaum

13

Chaotic behavior and strange attractor in time-dependent solutions of the magnetohydrodynamic equations for the Faraday disc  

SciTech Connect

Chaos and a strange attractor were found in time-dependent solutions of the full magnetohydrodynamic equations for a Faraday disc in an applied magnetic {open_quotes}seed{close_quotes} field. These were treated by the Galerkin method, truncated at five modes. The seed field is amplified several hundredfold. There are also aperiodic {open_quotes}partial pole reversals.{close_quotes} {copyright} {ital 1997 American Institute of Physics.}

Ingraham, R.L.; Vulcan, T. [Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003 (United States)] [Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003 (United States)

1997-09-01

14

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

15

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

16

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

17

Real-Time Simulation Clock  

NASA Technical Reports Server (NTRS)

Fiber-optic network delivers time signals to widely separated simulator sites. Real-time digital flight simulation used to support variety of research programs. Majority of research involves man-in-the-loop simulation requiring interconnection of digital computers, simulation cockpits, control consoles, graphics subsystems, and related equipment. Real-time simulation subsystem consists of several CYBER(R) computers and over 20 simulation sites. Allows for several simultaneous simulation jobs on one CYBER(R) as well as any combination of sites in each integrated simulation job.

Bennington, Donald R.

1987-01-01

18

Real-time\\/parallel computing  

Microsoft Academic Search

This book discusses the real-time, parallel computing of digitized images including both the symbolic and semantic data derived from such images. The processing, storing, and transmitting of images and image data are examined. Techniques and algorithms for the analysis and manipulation of images are explored both theoretically and in terms of implementation in hardware and software. The main subject areas

M. Onoe; K. Preston; A. Rosenfield

1983-01-01

19

Making Real-Time Data  

Microsoft Academic Search

Helping educators realize the benefits of integrating technology into curricula to effectively engage student learning and improve student achievement, particularly in science and mathematics, is the core mission of the Center for Improved Engineering and Science Education (CIESE). To achieve our mission, we focus on projects utilizing real-time data available from the Internet, and collaborative projects utilizing the Internet's potential

L. Hotaling

2003-01-01

20

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

21

Real-Time Photoacoustic Microscopy  

Microsoft Academic Search

In this thesis we developed a new real-time photoacoustic microscopy theory for detecting subsurface defects in opaque solid samples. The theory is verified by experiment and applied to a gas-microphone photoacoustic microscope. A line scan image can be achieved in tens of hundreds milliseconds in contrast to several minutes in conventional photoacoustic microscopy. This new technique differs from conventional photoacoustic

Zhi-Ming Liu

1987-01-01

22

Faraday Loop Model  

NSDL National Science Digital Library

The EJS Faraday Loop Model shows a conducting loop in a time-dependent constant magnetic field. The model is initially incomplete and students must complete the model by adding the appropriate equations. If Ejs is installed, right-clicking within the plot and selecting âOpen Ejs Modelâ from the pop-up menu item allows for editing of the model. The Faraday Loop model was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_em_FaradayLoop.jar file will run the program if Java is installed. Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional Ejs models are available. They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

Cox, Anne

2009-06-26

23

[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

24

Real-Time Cloud Rendering  

Microsoft Academic Search

This paper presents a method for realistic real-time rendering of clouds suitable for flight simulation and games. It provides a cloud shading algorithm that approximates multiple forward scattering in a preprocess, and first order anisotropic scattering at runtime. Impostors are used to accelerate cloud rendering by exploiting frame-to-frame coherence in an interactive flight simulation. Impostors are shown to be particularly

Mark J. Harris; Anselmo Lastra

2001-01-01

25

Real-Time Weather Data  

NSDL National Science Digital Library

This website provides real-time and forecast weather maps and data for the United States. The Satellite section contains satellite weather images from the GOES 8 and GOES 10 satellites, the Radar section contains radar weather images from NEXRAD radars, the Surface Data section contains plots of various weather conditions (temperatures, winds, pressure, precipitation), and the Upper Air section plots winds and temperatures across the United States.

26

Real-time meshless deformation  

Microsoft Academic Search

In this paper, we articulate a meshless compu- tational paradigm for the effective modeling, accurate physical simulation, and real-time animation of point-sampled solid objects. Both the interior and the boundary geometry of our volumetric object representation only consist of points, further extending the pow- erful and popular method of point-sampled surfaces to the volumetric setting. We build the point-based physical

Xiaohu Guo; Hong Qin

2005-01-01

27

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

28

Abstraction Planning in Real Time  

NASA Technical Reports Server (NTRS)

When a planning agent works in a complex, real-world domain, it is unable to plan for and store all possible contingencies and problem situations ahead of time. This thesis presents a method for planning a run time that incrementally builds up plans at multiple levels of abstraction. The plans are continually updated by information from the world, allowing the planner to adjust its plan to a changing world during the planning process. All the information is represented over intervals of time, allowing the planner to reason about durations, deadlines, and delays within its plan. In addition to the method, the thesis presents a formal model of the planning process and uses the model to investigate planning strategies.

Washington, R.

1994-01-01

29

Real time infrared aerosol analyzer  

DOEpatents

Apparatus for analyzing aerosols in essentially real time includes a virtual impactor which separates coarse particles from fine and ultrafine particles in an aerosol sample. The coarse and ultrafine particles are captured in PTFE filters, and the fine particles impact onto an internal light reflection element. The composition and quantity of the particles on the PTFE filter and on the internal reflection element are measured by alternately passing infrared light through the filter and the internal light reflection element, and analyzing the light through infrared spectrophotometry to identify the particles in the sample.

Johnson, Stanley A. (Countryside, IL); Reedy, Gerald T. (Bourbonnais, IL); Kumar, Romesh (Naperville, IL)

1990-01-01

30

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

31

Real-time rotation vectors.  

PubMed

Rotation vectors are a useful way of describing eye position without reference to arbitrary axes of rotation since any eye position can be reached from the reference position by rotation about a single axis. A real-time display of rotation vectors would not only help to acquire more reliable data, but would also widen the range of possible eye movement experiments. We describe a novel PC based data acquisition and analysis system which calculates and displays rotation vectors, velocity vectors and Listing's plane in real-time using voltages obtained from a two field coil system. The system was implemented using LabVIEW and optimised using Code Interface Nodes. Off-line processing can be sped up by varying parameters that indicate the amount of available RAM. During processing Listing's plane data can be rotated horizontally, vertically and torsionally. A computer controlled laser target changes position randomly every half second and so the targets are evenly spread, producing an appropriate range of eye positions which are used to calculate Listing's plane. PMID:10474978

Migliaccio, A A; Todd, M J

1999-06-01

32

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

33

Evaluation of Real-Time Synchronization in Real-Time Mach  

Microsoft Academic Search

Real-Time Mach provides real-time thread and real-time syn- chronization facilities. A real-time thread can be created for a periodic or aperiodic activity with a timing constraint. Th reads can be synchronized among them using a real-time version of the monitor based synchronization mechanism with a suitable locking protocol. In Real-Time Mach, we have implemented several locking policies, such as kernelized

Hideyuki Tokuda; Tatsuo Nakajima

1991-01-01

34

PROTECTING INFRASTRUCTURE ASSETS FROM REAL-TIME  

E-print Network

systems with current operating systems, at least with regard to real-time availability and run in these systems necessitate an approach to se- curity that focuses on both real-time availability and malware in real-time ­ correct messages delivered at the wrong time can lead to erroneous responses and system

Burmester, Mike

35

Real-time speech animation system  

E-print Network

We optimize the synthesis procedure of a videorealistic speech animation system [7] to achieve real-time speech animation synthesis. A synthesis rate must be high enough for real-time video streaming for speech animation ...

Fu, Jieyun

2011-01-01

36

Real-Time Ethernet Networks Simulation Model.  

E-print Network

?? Real-time networks are traditionally built on proprietary standards, resulting in a interoperability issues between different real-time netork implementations and traditional data networks mainly used… (more)

Pensawat, Taweewit

2006-01-01

37

MISR Level 1 Near Real Time Products  

Level 1 Near Real Time The MISR Near Real Time Level 1 data products consist of radiance measurements organized in 10-50 minute ... (off-nadir) cameras. The remaining channels are sampled at 1.1 km. ...

2014-09-15

38

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

39

ARTS: a distributed real-time kernel  

Microsoft Academic Search

ARTS is a distributed real-time operating system designed for a real-time systems testbed being developed at Camegle Mellon University. The objective of the testbed is to develop and verify advanced real-time computing technologies for a distributed environment. The tastbed consists of a set of SUN3 workstations connected by a real-time network based on IEEE 802.5 Token Ring and Ethernet. The

Hideyuki Tokuda; Clifford W. Mercer

1989-01-01

40

Real-Time Systems Processor Architecture  

E-print Network

hardware design. The architectural considerations assume an event triggered hard real-time system with kerOn Real-Time Systems and Processor Architecture Roger Johansson Department of Computer Engineering Abstract This report discusses the impact of hard real-time systems requirements on mi- croprocessor

Johansson, Roger

41

EECE 353 -Real Time Systems Sherif Abdelwahed  

E-print Network

-system design. We shall see ... Advances in supercomputing hardware will take care of real-time requirements would like to automate (as much as possible) real-time system design, instead of relying on clever handEECE 353 - Real Time Systems Sherif Abdelwahed Institute for Software Integrated Systems Vanderbilt

Abdelwahed, Sherif

42

Design Methods For Real-Time  

E-print Network

Design Methods For Real-Time Systems In Ada Kevin L. Mills CS 619 July 21, 1993 #12;Design Methods, and then to an identification and specification of system components. For real-time systems, a design method must help identify for designing real-time systems that will be implemented in Ada. This paper helps a designer to choose between

Mills, Kevin

43

Real-time interferometric synthetic aperture microscopy  

E-print Network

) system design with real-time 2D cross-sectional processing is described in detail. The system can acquireReal-time interferometric synthetic aperture microscopy Tyler S. Ralston1,2,* , Daniel L. Marks1 indistinguishable scattering intensities and provides proof of feasibility for future real-time ISAM systems. ©2008

Bhargava, Rohit

44

Designing Distributed, Real-Time Systems  

E-print Network

- - Designing Distributed, Real-Time Systems Kevin L. Mills INFT 796 SUMMER 1993 DIRECTED READINGS IN SOFTWARE ENGINEERING WITH DR. H. GOMAA GEORGE MASON UNIVERSITY #12;Designing Distributed, Real-Time Systems problem faced by designers of software systems, and particularly by designers of distributed, real-time

Mills, Kevin

45

Introduction to Real-Time Databases  

E-print Network

11 Introduction to Real-Time Databases ktw@csktw@csieie..ntntu.edu.twu.edu.tw (Embedded Systems and Tei-Wei Kuo, "Real-Time Database Systems: Architecture and Techniques", Kluwer Academic Publishers, 2000 Krishna and Kang, "Real-TimeSystems," McGRAW-HILL, 1997. 22 @ all rights preserved for Tei-Wei Kuo

Ouhyoung, Ming

46

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

47

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

48

Deconvolving Current from Faraday Rotation Measurement  

SciTech Connect

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, which reveals much of the Faraday rotation measurement’s implicit information necessary for unfolding the dynamic current measurement.

Stephen E. Mitchell

2008-02-01

49

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

50

VERSE - Virtual Equivalent Real-time Simulation  

NASA Technical Reports Server (NTRS)

Distributed real-time simulations provide important timing validation and hardware in the- loop results for the spacecraft flight software development cycle. Occasionally, the need for higher fidelity modeling and more comprehensive debugging capabilities - combined with a limited amount of computational resources - calls for a non real-time simulation environment that mimics the real-time environment. By creating a non real-time environment that accommodates simulations and flight software designed for a multi-CPU real-time system, we can save development time, cut mission costs, and reduce the likelihood of errors. This paper presents such a solution: Virtual Equivalent Real-time Simulation Environment (VERSE). VERSE turns the real-time operating system RTAI (Real-time Application Interface) into an event driven simulator that runs in virtual real time. Designed to keep the original RTAI architecture as intact as possible, and therefore inheriting RTAI's many capabilities, VERSE was implemented with remarkably little change to the RTAI source code. This small footprint together with use of the same API allows users to easily run the same application in both real-time and virtual time environments. VERSE has been used to build a workstation testbed for NASA's Space Interferometry Mission (SIM PlanetQuest) instrument flight software. With its flexible simulation controls and inexpensive setup and replication costs, VERSE will become an invaluable tool in future mission development.

Zheng, Yang; Martin, Bryan J.; Villaume, Nathaniel

2005-01-01

51

User-level real-time network system on Real-Time Mach  

Microsoft Academic Search

The paper presents the design and implementation of a user level real time network system in Real-Time Mach. Traditional network systems, which tend to focus on high performance and flexibility, are not suitable for real time communication. Our network system provides a framework for implementing real time network protocols which are able to bound end to end delay and throughput.

Tatsuo Nakajima; Hideyuki Tokuda

1996-01-01

52

Arnold Schwarzenegger REAL-TIME GRID RELIABILITY  

E-print Network

Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT California ISO Real: California Energy Commission Public Interest Energy Research Program Prepared By: Lawrence Berkeley National Laboratory Consortium for Electric Reliability Technology Solutions APPENDIXC October 2008 CEC-500

53

Landsat real-time processing  

SciTech Connect

A novel method for performing real-time acquisition and processing Landsat/EROS data covers all aspects including radiometric and geometric corrections of multispectral scanner or return-beam vidicon inputs, image enhancement, statistical analysis, feature extraction, and classification. Radiometric transformations include bias/gain adjustment, noise suppression, calibration, scan angle compensation, and illumination compensation, including topography and atmospheric effects. Correction or compensation for geometric distortion includes sensor-related distortions, such as centering, skew, size, scan nonlinearity, radial symmetry, and tangential symmetry. Also included are object image-related distortions such as aspect angle (altitude), scale distortion (altitude), terrain relief, and earth curvature. Ephemeral corrections are also applied to compensate for satellite forward movement, earth rotation, altitude variations, satellite vibration, and mirror scan velocity. Image enhancement includes high-pass, low-pass, and Laplacian mask filtering and data restoration for intermittent losses. Resource classification is provided by statistical analysis including histograms, correlational analysis, matrix manipulations, and determination of spectral responses. Feature extraction includes spatial frequency analysis, which is used in parallel discriminant functions in each array processor for rapid determination. The technique uses integrated parallel array processors that decimate the tasks concurrently under supervision of a control processor. The operator-machine interface is optimized for programming ease and graphics image windowing.

Davis, E.L.

1986-04-01

54

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

55

Real-Time Communication in Multihop Networks  

Microsoft Academic Search

Communication in real-time systems has to be predictable, because unpredictable delaysin the delivery of messages can adversely affect the execution of tasks dependent onthese messages. We develop a scheme for providing predictable interprocesscommunication in real-time systems with (partially connected) point-to-pointinterconnection networks, which provide guarantees on the maximum delivery time formessages. This scheme is based on the concept of a real-time

Dilip D. Kandlur; Kang G. Shin; Domenico Ferrari

1994-01-01

56

The Case for Dynamic Real-Time Task Timing in Modern Real-Time Systems  

Microsoft Academic Search

Summary form only given. Traditional real-time systems require a priori knowledge of process period and worst-case execution times in order to guarantee application and system performance. Traditional static worst-case execution time analysis has been developed to support this requirement. However, real-time systems have grown beyond static applications developed for unchanging and well-documented hardware and software architectures. They now include (perhaps

Scott A. Brandt

2004-01-01

57

Students Collecting Real time Data  

NASA Astrophysics Data System (ADS)

Students Collecting Real-Time Data The Hawaiian Islands Humpback Whale National Marine Sanctuary has created opportunities for middle and high school students to become Student Researchers and to be involved in real-time marine data collection. It is important that we expose students to different fields of science and encourage them to enter scientific fields of study. The Humpback Whale Sanctuary has an education visitor center in Kihei, Maui. Located right on the beach, the site has become a living classroom facility. There is a traditional Hawaiian fishpond fronting the property. The fishpond wall is being restored, using traditional methods. The site has the incredible opportunity of incorporating Hawaiian cultural practices with scientific studies. The Sanctuary offers opportunities for students to get involved in monitoring and data collection studies. Invasive Seaweed Study: Students are collecting data on invasive seaweed for the University of Hawaii. They pull a large net through the shallow waters. Seaweed is sorted, identified and weighed. The invasive seaweeds are removed. The data is recorded and sent to UH. Remote controlled monitoring boats: The sanctuary has 6 boogie board sized remote controlled boats used to monitor reefs. Boats have a camera with lights on the underside. The boats have water quality monitoring devices and GPS units. The video from the underwater camera is transmitted via a wireless transmission. Students are able to monitor the fish, limu and invertebrate populations on the reef and collect water quality data via television monitors or computers. The boat can also pull a small plankton tow net. Data is being compiled into data bases. Artificial Reef Modules: The Sanctuary has a scientific permit from the state to build and deploy artificial reef modules. High school students are designing and building modules. These are deployed out in the Fishpond fronting the Sanctuary site and students are monitoring them on a weekly basis. Students are also building traditional Hawaiian modules, these being piles of rocks and attaching seaweeds to the rocks with natural fibers. The purpose of all these is to help restore habitat to the fishpond. Monitoring the Fishpond; The fishpond wall is presently being rebuilt. The new wall stands about eight feet high and twelve feet wide. The rocks to rebuild the wall are all being located underwater where the old wall stood. The state has required different information collected as the wall is reconstructed. Students GPS mapped the rock edges of the fallen wall, and will continue to map the progress of the new wall. Other students are monitoring the erosion of the sand dunes that front the edges of the wall and are also looking at the new deposition of sand in the pond. Students are snorkeling, running transects and collecting data on the changing populations of fish, invertebrates and seaweeds in the pond. The wall is only about a forth built and already we are seeing growth in the populations. Students and teachers work with the sanctuary staff to develop projects. The sanctuary loans the equipment to the students and the students collect the data for the sanctuary. It is a great partnership with the schools. The Sanctuary has been given a Congressional Earmark this year to develop marine curriculum for the Department of Education. Projects listed above are part of this curriculum with hopes of many more to be developed. By 2008, all seniors must participate in some type of research project to graduate. The goal is to offer opportunities for many of these projects to become marine science related projects and thus develop a budding new group of marine scientists.

Miller, P.

2006-05-01

58

About Real Time Scheduling Analysis of Ada Applications  

E-print Network

. Introduction Real time systems. What is real time scheduling. What we aim to do in this tutorial ? 2. Real time-Europe'08 tutorial, Venice ­ Page 2/79 #12;Real time systems · "Real time systems are defined as those-Europe'08 tutorial, Venice ­ Page 3/79 #12;What is real time scheduling (1) · Many real time systems

Brest, Université de

59

Verifying Linear Real-Time Logic Specifications  

Microsoft Academic Search

Formal specification and verification are critical to the development of safe real-time and embedded systems, which have become increasingly complex. Real-time logic (RTL) has been used to describe the specification and safety assertion of real-time systems. However, the satisfiability problem for RTL, as well as other first-order logics, is undecidable. There exist already non-trivial fragments of RTL, like path RTL

Stefan Andrei; Albert M. K. Cheng

2007-01-01

60

Communicating Real-Time State Machines  

Microsoft Academic Search

Communicating real-time state machines (CRSMs), a complete and executable notation for specifying concurrent real-time systems including the monitored and controlled physical environment, are introduced. They are essentially state machines that communicate synchronously in a manner much like the input-output in Hoare's CSP. In addition, CRSMs have a novel and small set of facilities for describing timing properties and accessing real

Alan C. Shaw

1992-01-01

61

Computer-aided real-time design  

Microsoft Academic Search

Unique issues such as concurrency, intertask communication and synchronization, timing constraints and software-hardware interface specification are the crux of software engineering for real-time embedded systems. The methods and tools needed for the design of such systems are presented. A detailed example is given, showing the use of CARDtools real-time design tools

D. Kalinsky; A. Avnur

1988-01-01

62

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

63

Tools for real time system design  

Microsoft Academic Search

This paper describes the development of a toolset that supports the specification and design of large real time systems. The starting point is the evolution of a method suitable for use in practical environments; for example in the specification of telecommunication systems. The characteristics that are required of a good specification method for real time systems are discussed and a

R. A. Orr; M. T. Norris; R. Tinker; C. D. V. Rouch

1988-01-01

64

Real time programming environment for Windows  

SciTech Connect

This document provides a description of the Real Time Programming Environment (RTProE). RTProE tools allow a programmer to create soft real time projects under general, multi-purpose operating systems. The basic features necessary for real time applications are provided by RTProE, leaving the programmer free to concentrate efforts on his specific project. The current version supports Microsoft Windows{trademark} 95 and NT. The tasks of real time synchronization and communication with other programs are handled by RTProE. RTProE includes a generic method for connecting a graphical user interface (GUI) to allow real time control and interaction with the programmer`s product. Topics covered in this paper include real time performance issues, portability, details of shared memory management, code scheduling, application control, Operating System specific concerns and the use of Computer Aided Software Engineering (CASE) tools. The development of RTProE is an important step in the expansion of the real time programming community. The financial costs associated with using the system are minimal. All source code for RTProE has been made publicly available. Any person with access to a personal computer, Windows 95 or NT, and C or FORTRAN compilers can quickly enter the world of real time modeling and simulation.

LaBelle, D.R. [LaBelle (Dennis R.), Clifton Park, NY (United States)

1998-04-01

65

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

66

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

67

Formal Specification of Real-Time Systems  

Microsoft Academic Search

This paper presents the formal syntax and semantics of Real Time Logic (RTL), a logic for the specification of real-time systems. An example illustrating the specification of a system in RTL is presented, and natural deduction is used to verify that the system satisfies a given safety property. RTL is shown to be undecidable by a reduction from the acceptance

Farnam Jahanian; Aloysius K. Mok; Douglas A. Stuart

1988-01-01

68

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

69

Duration Properties over Real Time System Designs  

Microsoft Academic Search

Constraints on the accumulated sojourn time at particular system states are among the possible requirements for a real-time system. These requirements are called duration properties. The need to predict temporal behavior of critical real-time systems has encouraged the development of a useful collection of results for run-time scheduling as well as an interesting set of formal automatic techniques based on

Víctor A. Braberman; Fabio Pieniazek

2000-01-01

70

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

71

A framework for adaptive real-time applications: the declarative real-time OSGi component model  

Microsoft Academic Search

Nowadays, more and more applications require OSGi to have some forms of real-time support, which is currently very limited. The resulting ad-hoc solutions forbid standard, system-wide policies for real-time system's adaptation, and reconfiguration. In order to tackle this problem, this paper proposes a declarative real-time component model. In this model, the distinguishing real-time contract of each component is declaratively described,

Ning Gui; Vincenzo De Florio; Hong Sun; Chris Blondia

2008-01-01

72

Real-Time Specification Inheritance Anomalies and Real-Time Filters  

Microsoft Academic Search

Real-time programs are, in general, difficult to design and verify. The inheritance mechanism can be useful in reusing well-defined and verified real-time programs. In applications developed by current real-time object- oriented languages, however, changing application requirements or changing real-time specifications in sub- classes may require excessive redefinitions although this seems to be intuitively unnecessary. We refer to this as the

Mehmet Aksit; Jan Bosch; William Van Der Sterren; Lodewijk Bergmans; Mario Tokoro; Remo Pareschi

1994-01-01

73

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

74

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

75

RealTime Face Recognition System Gilbert and Yang A RealTime Face Recognition System  

E-print Network

including image preprocessing, face recognition algorithm, software development, and VLSI hardwareReal­Time Face Recognition System Gilbert and Yang A Real­Time Face Recognition System Using Custom) 495­3987 Fax (617) 495­9837 Abstract A real­time face recognition system has been implemented

Yang, Woodward

76

The ALMA Real Time Control System  

NASA Astrophysics Data System (ADS)

The Atacama Large Millimeter Array (ALMA) is a revolutionary millimeter and submillimeter array being developed on the Atacama plateau of northern Chile. An international partnership lead by NRAO, ESO, and NAOJ this powerful and flexible telescope will provide unprecedented observations of this relatively unexplored frequency range. The control subsystem for the Atacama Large Millimeter Array must coordinate the monitor and control of at least sixty six antennas (in four different styles), two correlators, and all of the ancillary equipment (samplers, local oscillators, front ends, etc.). This equipment will be spread over tens of kilometers and operated remotely. Operation of the array requires a robust, scalable, and maintainable real time control system. The real time control system is responsible for monitoring and control of any devices where there are fixed deadlines. Examples in the ALMA context are antenna pointing and fringe tracking. Traditionally the real time portion of a large software system is an intricate and error prone portion of the software. As a result the real time portion is very expensive in terms of effort expended both during construction and during maintenance phases of a project. The ALMA real time control system uses a Linux based real time operating system to interact with the hardware and the CORBA based ALMA Common Software to communicate in the distributed computing environment. Mixing the requirements of real time computing and the non-deterministic CORBA middleware has produced an interesting design. We discuss the architecture, design, and implementation of the ALMA real time control system. Highlight some lessons learned along the way, and justify our assertion that this should be the last large scale real time control system in radio astronomy.

Kern, Jeffrey S.; Juerges, Thomas A.; Marson, Ralph G.

2009-01-01

77

Real-time monitoring of landslides  

USGS Publications Warehouse

Landslides cause fatalities and property damage throughout the Nation. To reduce the impact from hazardous landslides, the U.S. Geological Survey develops and uses real-time and near-real-time landslide monitoring systems. Monitoring can detect when hillslopes are primed for sliding and can provide early indications of rapid, catastrophic movement. Continuous information from up-to-the-minute or real-time monitoring provides prompt notification of landslide activity, advances our understanding of landslide behavior, and enables more effective engineering and planning efforts.

Reid, Mark E.; LaHusen, Richard G.; Baum, Rex L.; Kean, Jason W.; Schulz, William H.; Highland, Lynn M.

2012-01-01

78

Real-Time Monitoring of Active Landslides  

USGS Publications Warehouse

Landslides threaten lives and property in every State in the Nation. To reduce the risk from active landslides, the U.S. Geological Survey (USGS) develops and uses real-time landslide monitoring systems. Monitoring can detect early indications of rapid, catastrophic movement. Up-to-the-minute or real-time monitoring provides immediate notification of landslide activity, potentially saving lives and property. Continuous information from real-time monitoring also provides a better understanding of landslide behavior, enabling engineers to create more effective designs for halting landslide movement.

Reid, Mark E.; LaHusen, Richard G.; Ellis, William L.

1999-01-01

79

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

80

Real-time Vehicle Reidentification System for Freeway Performance Measurements  

E-print Network

real-time freeway performance measurement system in a real-world setting, the designDesign of Real-Time Traffic Performance Measurement System (Design a Real-time Traffic Performance Measurement System (

Jeng, Shin-Ting

2007-01-01

81

Evaluation of real-time object-oriented data models for real-time databases  

Microsoft Academic Search

The design of real-time databases needs to incorporate methods specifically developed to represent the timing constraints of the system under consideration. Real-time databases have timing constraints on data and on transactions upon the data. During the last few years, several research approaches have been directed towards using the relational model as a data model for real-time databases. However, neither approach

Zied Ellouze; Nada Louati; Rafik Bouaziz

2012-01-01

82

A Real-Time Monitor for a Distributed Real-Time Operating System  

Microsoft Academic Search

Distributed real-time systems are difficult to develop. External events occur independently of internal control, and the real-time system must be designed to accommodate them correctly. Two problems emerging from this are the logical correctness and the timing correctness of the system software: not only must it process the real-time events correctly, but the program timing must prevent the task of

Hideyuki Tokuda; Makato Kotera; Clifford E. Mercer

1990-01-01

83

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

84

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

85

Real-time animation of grass.  

E-print Network

??Real-time grass has many applications, such as in games, simulators and virtual reality. Physically-based simulation of grass-grass, grass-object, grass-terrain and grass-wind interactions requires a high… (more)

Chen, Kan.

2010-01-01

86

Arnold Schwarzenegger REAL-TIME GRID RELIABILITY  

E-print Network

Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT California ISO Phasor Application Summary Report Prepared For: California Energy Commission Public Interest Energy Research Program Prepared By: Lawrence Berkeley National Laboratory Consortium for Electric Reliability Technology Solutions

87

MISR Near Real Time Products Available  

... (MISR) project and the NASA Langley Atmospheric Science Data Center (ASDC) announce the release of new Near Real Time (NRT) ... MISR_NRT , and by order through the online NASA Reverb Earth Science Discovery Tool .   Information about these products and ...

2014-09-04

88

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

89

Real-time smart fluorescence sensor platform  

NASA Astrophysics Data System (ADS)

A novel compact LED array based light induced fluorescence (LIF) sensor has been developed for real-time in-line monitoring of intrinsic fluorophores in the solid and liquid state. The sensor is essential for on-the-spot, routine, and cost effective real-time analysis. The sensor is designed to provide real-time emission response along with various smart sensing parameters to ensure real-time measurement quality that is required for regulated GMP process monitoring applications. This work describes a LIF sensor tailored for solid-phase fluorometry. Fundamental figures of merit, excitation overexposure and smart sensing features required for modern process monitoring and control are discussed within the context of pharmaceutical solid-phase manufacturing and similar applications.

Dickens, Jason E.; Vaughn, Mike S.; Taylor, Mervin; Ponstingl, Mike

2011-06-01

90

REAL-TIME CROP SENSORS  

Technology Transfer Automated Retrieval System (TEKTRAN)

Management practices that respond to the health and vigor of the crop, rather than rely solely on measurement of soil properties and anticipation of how the crop will interact with the environment, require access to accurate, timely, and inexpensive sources of spatial and temporal data. Remote sensi...

91

Formalizing Real-Time System Design  

Microsoft Academic Search

This paper identifies ways in which formal real-time notations (VDM++) real-time design methods (HRT-HOOD) and simulation tools (gPROMS) can be combined in practical developments.\\u000a \\u000a The benefits of such a combination include that a precise semantics can be attached to specifications in HRT-HOOD using the\\u000a VDM++ notation and that HRT-HOOD guidelines on structuring and decomposition can be used for VDM++ specifications

Kevin Lano; S. J. Goldsack

1997-01-01

92

A Real Time Operating Systems (RTOS) Comparison  

Microsoft Academic Search

This article presents quantitative and qualitative results obtained from the analysis of real time operating systems (RTOS). The studied systems were Windows CE, QNX Neutrino, VxWorks, Linux and RTAI-Linux, which are largely used in industrial and academic environments. Windows XP was also analysed, as a reference for conventional non-real-time operating system, since such systems are also commonly and inadvertently used

Rafael V. Aroca; Glauco Caurin

93

Real-time operating system in Java  

Microsoft Academic Search

Real-time operating systems (RTOSes) are required to run for years, and never fail, without human intervention. Safety is the primary concern for RTOSes because they usually control physical equipment. One strand of real-time operating system (RTOS) research is looking at the question: can developing an RTOS in a safe language result in a system that an errant process can’t crash?

Qinghua Lu

2007-01-01

94

Real-Time Digital Radiography Upgrade  

NASA Technical Reports Server (NTRS)

The objective of the task is to upgrade an existing real-time digital radiography system by replacing an aged image intensifier tube with an amorphous silicon digital x-ray imager. The real-time digital radiography system at GSFC is currently fitted with image intensifier tube with a 4 or 2 inch diameter active area with higher resolution at the smaller area. The image intensifier is exhibiting deterioration in sensitivity associated with extended use and is in need of replacement.

Parker, Bradford H.

2008-01-01

95

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

96

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.

97

New Trends in Real Time Operating Systems  

Microsoft Academic Search

Most of today's embedded systems are required to work in dynamic environments, where the characteristics of the computational load cannot always be predicted in advance. Still timely responses to events have to be provided within precise timing constraints in order to guarantee a desired level of performance. Hence, embedded systems are, by nature, inherently real-time. Moreover, most of embedded systems

Shraddha S. Nakate; B. Meshram; Jayamala P. Chavan

2012-01-01

98

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

99

Minimizing Busy Time in Multiple Machine Real-time Scheduling  

E-print Network

Minimizing Busy Time in Multiple Machine Real-time Scheduling Rohit Khandekar1 , Baruch Schieber1 with a release time, a due date, a processing time and demand for machine capacity. The goal is to schedule all of the jobs non-preemptively in their release-time-deadline windows, subject to machine capacity constraints

Shachnai, Hadas

100

Characterization of real-time computers  

NASA Technical Reports Server (NTRS)

A real-time system consists of a computer controller and controlled processes. Despite the synergistic relationship between these two components, they have been traditionally designed and analyzed independently of and separately from each other; namely, computer controllers by computer scientists/engineers and controlled processes by control scientists. As a remedy for this problem, in this report real-time computers are characterized by performance measures based on computer controller response time that are: (1) congruent to the real-time applications, (2) able to offer an objective comparison of rival computer systems, and (3) experimentally measurable/determinable. These measures, unlike others, provide the real-time computer controller with a natural link to controlled processes. In order to demonstrate their utility and power, these measures are first determined for example controlled processes on the basis of control performance functionals. They are then used for two important real-time multiprocessor design applications - the number-power tradeoff and fault-masking and synchronization.

Shin, K. G.; Krishna, C. M.

1984-01-01

101

A framework to model dependable real-time systems based on real-time object model  

Microsoft Academic Search

Proposes a framework to model fault-tolerant real-time systems consisting of RobustRTOs (Robust Real-Time Objects) and RMOs (Region Monitor real-time Objects). A RobustRTO is an object which is capable of tolerating faults in itself. Many existing fault-tolerant mechanisms, such as RB (recovery blocks) and NVP (N-version programming), are modeled as RobustRTOs. An RMO is an object which is capable of monitoring

Hyung-taek Lim; Seung-min Yang

2000-01-01

102

Real-Time System Design Tools for RTO.e (Real-Time Object.extended)  

Microsoft Academic Search

This paper presents an approach to developing Real-time Dependable Systems (RDSs) based on a real-time object model. A system development process can be divided into two phases, that is, Specification Phase and Construction Phase. In the Specification Phase, especially for an RDS, system requirements are decomposed into a group of Real-Time Objects (RTOs) and appropriate objects are identified by means

Byung Kwon Ahn; Seung-min Yang; Joong-sup Choi; Moon-hae Kim

1996-01-01

103

Enhancing Real-Time CORBA via Optimization Strategies and Real-Time Java features  

Microsoft Academic Search

End-to-end middleware predictability is essential to support quality of service (QoS) capabilities needed by distributed real-time and embedded (DRE) applications. Real-time CORBA is a middleware standard that allows DRE applica- tions to allocate, schedule, and control the QoS of CPU, mem- ory, and networking resources. Existing Real-time CORBA solutions are implemented in C++, which is generally more complicated and error-prone

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

2004-01-01

104

Design, Modeling and Implementation of a Real-Time Object Model for Real-Time Databases  

Microsoft Academic Search

The object model is very promising for real-time applications that must handle complex real-world objects with short deadlines due to its capabilities for modeling, storing, and manipulating complex objects. However, real-time databases require tight control and, particularly, they need to take into account temporal aspects of data and timing constraints on transactions. This paper is about the application of the

Nada Louati; Rafik Bouaziz; Claude Duvallet; Bruno Sadeg

2011-01-01

105

Real-Time Edge Follow: A Real-Time Path Search Approach  

Microsoft Academic Search

Real-time path search is the problem of searching a path from a starting point to a goal point in real-time. In dynamic and partially observable environments, agents need to observe the environment to track changes, explore to learn unknowns, and search suitable routes to reach the goal rapidly. These tasks fre- quently require real-time search. In this paper, we address

Cagatay Undeger; Faruk Polat

2007-01-01

106

On Using Real-Time Static Locking Protocols for Distributed Real-Time Databases  

Microsoft Academic Search

The use of Static Two Phase Locking Protocols (S2PL) for concurrency control in real-time database systems (RTDBS) has received little attention in the past. Actually, real-time S2PL (RT-S2PL) protocols do possess some desirable features making them suitable for RTDBS, especially for distributed real-time database systems (DRTDBS) in which remote locking is required and distributed deadlock is possible. In this paper,

Kam-Yiu Lam; Sheung-Lun Hung; Sang H. Son

1997-01-01

107

Enhancing Real-Time CORBA via Real-Time Java Features  

Microsoft Academic Search

End-to-end middleware predictability is essential to support quality of service (QoS) capabilities needed by dis- tributed real-time and embedded (DRE) applications. Real-time CORBA is a middleware standard that allows DRE applications to allocate, schedule, and control the QoS of CPU, memory, and networking resources. Existing Real-time CORBA solutions are implemented in C++, which is generally more complicated and error-prone to

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

2004-01-01

108

The Concise Handbook of Real-Time Systems  

E-print Network

Wiz® : An Integrated Design and Simulation Environment for Real-Time SystemsThe 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

109

Real-time recurrent neural state estimation.  

PubMed

A nonlinear discrete-time neural observer for discrete-time unknown nonlinear systems in presence of external disturbances and parameter uncertainties is presented. It is based on a discrete-time recurrent high-order neural network trained with an extended Kalman-filter based algorithm. This brief includes the stability proof based on the Lyapunov approach. The applicability of the proposed scheme is illustrated by real-time implementation for a three phase induction motor. PMID:21245007

Alanis, Alma Y; Sanchez, Edgar N; Loukianov, Alexander G; Perez, Marco A

2011-03-01

110

Statistical Real-Time Communication over Ethernet  

Microsoft Academic Search

In order to realize real-time communication over Ethernet or fast Ethernet, one must be able to bound the medium access time within an acceptable limit. The multiple access nature of Ethernet makes it impossible to guarantee a deterministic medium access time (hence, packet-delivery deadlines) to individual stations. However, one can bound the medium access time statistically by limiting the packet-arrival

Seok-kyu Kweon; Kang G. Shin

2003-01-01

111

Real-Time Plan Adaptation for Case-Based Planning in Real-Time Strategy Games  

Microsoft Academic Search

Case-based planning (CBP) is based on reusing past success- ful plans for solving new problems. CBP is particularly useful in envi- ronments where the large amount of time required to traverse extensive search spaces makes traditional planning techniques unsuitable. In par- ticular, in real-time domains, past plans need to be retrieved and adapted in real time and ecient plan adaptation

Neha Sugandh; Santiago Ontañón; Ashwin Ram

2008-01-01

112

Real-Time Systems Design with PEP  

Microsoft Academic Search

Abstract: The PEP tool provides an integrated development and verication environment for parallel systems. Beginning with version 2.0 italso oers use of timed systems. This paper describes a sample sessionfor the design and the verication by partial order based techniques of asimple real-time model for a mutual exclusion algorithm.

Christian Stehno

2002-01-01

113

Preemptibility in Real-Time Operating Systems  

Microsoft Academic Search

Real-time operating systems generally depend on some form of priority information for making scheduling deci- sions. Priorities may take the form of small integers or deadline times, for example, and the priorities indicate th e preferred order for execution of the jobs. Unfortunately, most systems suffer from some degree of priority inversion where a high priority job must wait for

Clifford W. Mercer; Hideyuki Tokuda

1992-01-01

114

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

115

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

116

Feedback as Real-Time Constructions  

ERIC Educational Resources Information Center

This article offers a re-description of feedback and the significance of time in feedback constructions based on systems theory. It describes feedback as internal, real-time constructions in a learning system. From this perspective, feedback is neither immediate nor delayed, but occurs in the very moment it takes place. This article argues for a…

Keiding, Tina Bering; Qvortrup, Ane

2014-01-01

117

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

118

Real-time enhanced vision system  

NASA Astrophysics Data System (ADS)

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 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.

2005-05-01

119

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

120

Network protocols for real-time applications  

NASA Technical Reports Server (NTRS)

The Fiber Distributed Data Interface (FDDI) and the SAE AE-9B High Speed Ring Bus (HSRB) are emerging standards for high-performance token ring local area networks. FDDI was designed to be a general-purpose high-performance network. HSRB was designed specifically for military real-time applications. A workshop was conducted at NASA Ames Research Center in January, 1987 to compare and contrast these protocols with respect to their ability to support real-time applications. This report summarizes workshop presentations and includes an independent comparison of the two protocols. A conclusion reached at the workshop was that current protocols for the upper layers of the Open Systems Interconnection (OSI) network model are inadequate for real-time applications.

Johnson, Marjory J.

1987-01-01

121

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

122

Durham adaptive optics real-time controller.  

PubMed

The Durham adaptive optics (AO) real-time controller was initially a proof of concept design for a generic AO control system. It has since been developed into a modern and powerful central-processing-unit-based real-time control system, capable of using hardware acceleration (including field programmable gate arrays and graphical processing units), based primarily around commercial off-the-shelf hardware. It is powerful enough to be used as the real-time controller for all currently planned 8 m class telescope AO systems. Here we give details of this controller and the concepts behind it, and report on performance, including latency and jitter, which is less than 10 ?s for small AO systems. PMID:21068868

Basden, Alastair; Geng, Deli; Myers, Richard; Younger, Eddy

2010-11-10

123

Real-time inspection by submarine images  

NASA Astrophysics Data System (ADS)

A real-time application of computer vision concerning tracking and inspection of a submarine pipeline is described. The objective is to develop automatic procedures for supporting human operators in the real-time analysis of images acquired by means of cameras mounted on underwater remotely operated vehicles (ROV) Implementation of such procedures gives rise to a human-machine system for underwater pipeline inspection that can automatically detect and signal the presence of the pipe, of its structural or accessory elements, and of dangerous or alien objects in its neighborhood. The possibility of modifying the image acquisition rate in the simulations performed on video- recorded images is used to prove that the system performs all necessary processing with an acceptable robustness working in real-time up to a speed of about 2.5 kn, widely greater than that the actual ROVs and the security features allow.

Tascini, Guido; Zingaretti, Primo; Conte, Giuseppe

1996-10-01

124

Real Time Linux and the WTTM Project  

NASA Astrophysics Data System (ADS)

The WIYN Tip-Tilt Module (WTTM) is a low-order, low-cost adaptive optics solution to improve delivered image quality within a 4 X 4 arc minute science field across the B-H bands and optimized for the V-I bands. The system is greatly simplified by the use of a quad-cell APD-based error sensor and there is no deformable mirror. The software to handle this novel module and instrument will be written under real time Linux with LabVIEW for Linux acting as a supervisory GUI and post-analysis suite. This combination is proving highly effective in other projects and should enable us to concentrate on the correction algorithms: fixed frequency, fixed signal to noise, predictive and `maximum bandwidth'. This paper examines the suitability of real time Linux for serious scientific instrumentation in hard real time with frequencies > 8kHz.

Daly, P. N.

125

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

126

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.

127

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.

128

Making Real-Time Data "Real" for General Interest Users  

NASA Astrophysics Data System (ADS)

Helping educators realize the benefits of integrating technology into curricula to effectively engage student learning and improve student achievement, particularly in science and mathematics, is the core mission of the Center for Improved Engineering and Science Education (CIESE). To achieve our mission, we focus on projects utilizing real-time data available from the Internet, and collaborative projects utilizing the Internet's potential to reach peers and experts around the world. As a member of the Mid-Atlantic Center for Ocean Sciences Education Excellence (COSEE), the Center for Improved Engineering and Science Education (CIESE), is committed to delivering relevant ocean science education to diverse audiences, including K-12 teachers, students, coastal managers, families and tourists. The highest priority of the Mid-Atlantic COSEE is to involve scientists and educators in the translation of data and information from the coastal observatories into instructional materials and products usable by educators and the public. A combination of three regional observing systems, the New Jersey Shelf Observing System (NJSOS), Chesapeake Bay Observing System (CBOS), and the York River observing system will provide the scientific backbone for an integrated program of science and education that improves user access to, and understanding of, modern ocean science and how it affects our daily lives. At present, the Mid-Atlantic COSEE offers three projects that enable users to apply and validate scientific concepts to real world situations. (1) The Gulf Stream Voyage is an online multidisciplinary project that utilizes both real-time data and primary source materials to help guide students to discover the science and history of the Gulf Stream current. (2) C.O.O.L. Classroom is an online project that utilizes concepts and real-time data collected through the NJSOS. The C.O.O.L. Classroom is based on the concept of the Rutgers-IMCS Coastal Ocean Observation Laboratory, a real place where ocean scientists from various disciplines study the coastal ocean collaboratively. (3) Oceans Connecting the Nation is an online collaborative project currently in development. The core activities will involve the study of Nonpoint Source Pollution (NPS). Students will conduct water quality (nutrient) testing and share that data, along with climate data and local characteristics with other participants. This will promote discussions about how NPS affects local communities as well as the oceans, and allow users to develop an understanding of how the oceans affect their daily lives.

Hotaling, L.

2003-04-01

129

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

130

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

131

Real-Time Elastography of the Prostate  

PubMed Central

Palpation of organs is one of the oldest clinical examination techniques, for instance, if you think of the palpation of the breast or the digital rectal examination of the prostate, where hard palpable regions are suspicious for cancer. This is the basic principle of real-time elastography, an ultrasound technique, which is able to visualise tissue elasticity. Since prostate cancer features an increased stiffness due to the higher cell and vessel density than the normal surrounding tissue, real-time elastography has been used for several years for prostate cancer detection. This review introduces the different techniques of ultrasound elastography and furthermore summarises its limitations and potentials. PMID:24967334

Junker, D.; De Zordo, T.; Quentin, M.; Ladurner, M.; Bektic, J.; Horniger, W.; Jaschke, W.; Aigner, F.

2014-01-01

132

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

133

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

134

Real-time Property Preservation in Concurrent Real-time Systems?  

Microsoft Academic Search

A key step in concurrent real-time system development is to build a model from which the implementation is synthesized. It is thus important to un- derstand the relation between the properties of a model and its corresponding implementation. In this paper, we first build two relations: 1) †-weakening rela- tions on MITLR formulas, which are used to express real-time properties

Jinfeng Huang; Jeroen Voeten; Marc Geilen

135

OPAD-EDIFIS Real-Time Processing  

NASA Technical Reports Server (NTRS)

The Optical Plume Anomaly Detection (OPAD) detects engine hardware degradation of flight vehicles through identification and quantification of elemental species found in the plume by analyzing the plume emission spectra in a real-time mode. Real-time performance of OPAD relies on extensive software which must report metal amounts in the plume faster than once every 0.5 sec. OPAD software previously written by NASA scientists performed most necessary functions at speeds which were far below what is needed for real-time operation. The research presented in this report improved the execution speed of the software by optimizing the code without changing the algorithms and converting it into a parallelized form which is executed in a shared-memory multiprocessor system. The resulting code was subjected to extensive timing analysis. The report also provides suggestions for further performance improvement by (1) identifying areas of algorithm optimization, (2) recommending commercially available multiprocessor architectures and operating systems to support real-time execution and (3) presenting an initial study of fault-tolerance requirements.

Katsinis, Constantine

1997-01-01

136

Replay Debugging of Real-Time Systems Using Time Machines  

Microsoft Academic Search

In this paper we present a new approach to deterministic replay using standard components. Our method facilitates cyclic debugging of real-time systems with industry standard real-time operating systems using industry standard debuggers. The method is based on a number of new techniques: A new marker for deterministic differentiation between e.g., loop iterations for deterministic reproduction of interrupts and task preemptions,

Henrik Thane; Daniel Sundmark; Joel Huselius; Anders Pettersson

2003-01-01

137

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

138

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 ...

139

Structuring Criteria For Real Time System Design  

Microsoft Academic Search

This paper discusses and compares the criteria used by different design methods for decomposing a real time system into tasks and modules. The criteria considered are coupling, cohesion and information hiding for module structuring and concurrency for tasks. The Stmctured Design method uses the module coupling and cohesion criteria. The NRL method and Object Oriented Design use information hiding as

Hassan Gomaa

1989-01-01

140

Real-Time Operating System/360  

NASA Technical Reports Server (NTRS)

RTOS has a cost savings advantage for real-time applications, such as those with random inputs requiring a flexible data routing facility, display systems simplified by a device independent interface language, and complex applications needing added storage protection and data queuing.

Hoffman, R. L.; Kopp, R. S.; Mueller, H. H.; Pollan, W. D.; Van Sant, B. W.; Weiler, P. W.

1969-01-01

141

Architecture of a real time operating system  

Microsoft Academic Search

Architecture is receiving increasing recognition as a major design factor for operating systems development which contributes to the clarity, and modifiability of the completed system. The MOSS Operating System uses an architecture based on hierarchical levels of system functions overlayed dynamically by asynchronous cooperating processes carrying out the system activities. Since efficient operation in a real time environment requires that

J. L. Pruitt; W. W. Case

1975-01-01

142

Arnold Schwarzenegger REAL-TIME GRID RELIABILITY  

E-print Network

System Dynamics Mechanical Analogy for Power System Dynamics Balls analogous to generators with different Monitoring System (RTDMSTM) Manu Parashar & Jim Dyer Electric Power Group (EPG) RTDMS CA ISO TRAINING SESSION Review of Some WECC Events CA ISO Real-Time Dynamics Monitoring System Project Objectives System

143

Real-time distributed multimedia systems  

SciTech Connect

This paper presents a survey on distributed multimedia systems and discusses real-time issues. In particular, different subsystems are reviewed that impact on multimedia networking, the networking for multimedia, the networked multimedia systems, and the leading edge research and developments efforts and issues in networking.

Rahurkar, S.S.; Bourbakis, N.G. [Binghamton Univ., NY (United States)

1996-12-31

144

Real-time shaded NC milling display  

Microsoft Academic Search

The real-time shaded display of a solid model being milled by a cutting tool following an NC path is attained by the image-space Boolean subtraction of solid objects. The technique is suitable for implementation in microcode in a raster graphic display processor. Update rates of 10 cutting operations per second are typical.

Tim Van Hook

1986-01-01

145

BBN real-time speech recognition demonstrations  

Microsoft Academic Search

Typically, real-time speech recognition -- if achieved at all -- is accomplished either by greatly simplifying the processing to be done, or by the use of special-purpose hardware. Each of these approaches has obvious problems. The former results in a substantial loss in accuracy, while the latter often results in obsolete hardware being developed at great expense and delay.

Steve Austin; Rusty Bobrow; Dan Ellard; Robert Ingria; John Makhoul; Long Nguyen; Pat Peterson; Paul Placeway; Richard Schwartz

1992-01-01

146

Klaus Honscheid Real Time 99 Data Acquisition  

E-print Network

ports) · ATM Link · Budget a few 100 K$ · Fast Ethernet Data Links · Multi VME CPU, shared memory Eventbuilder · Custom Link to Computer (Farm) · Budget ~ 100 K$ · Fast Ethernet Data Links · Fast Ethernet Switch + Solaris Computer · Fast Ethernet Link to DQM · Budget ~ 20 K$ #12;Klaus Honscheid Real Time 99

147

Real-Time Ethernet - Industry Prospective  

Microsoft Academic Search

After more than ten years of experience with applications of fieldbus in automation technology, the industry has started to develop and adopt Real-Time Ethernet (RTE) solutions. There already exists now more than ten proposed solutions. International Electrotechnical Commission standards are trying to give a guideline and selection criteria based on recognized indicators for the user.

MAX FELSER

2005-01-01

148

Real-Time Communication in FDDI Networks  

Microsoft Academic Search

This paper provides a comprehensive study of the use of FDDI networks to support real-time communication in mission-critical systems. Due to the potentially catastrophic results of failure in such systems, it is important to avoid message loss whenever possible. We develop efficient tests to check whether message loss may occur, either due to missing deadlines or due to buffer overflow.

Nicholas Malcolm; Sanjay Kamat; Wei Zhao

1996-01-01

149

Real-time optoacoustic monitoring during thermotherapy  

NASA Astrophysics Data System (ADS)

Optoacoustic monitoring of tissue optical properties and speed of sound in real time can provide fast and accurate feedback information during thermotherapy performed with various heating or cooling agents. Amplitude and temporal characteristics of optoacoustic pressure waves are dependent on tissue properties. Detection and measurement of the optoacoustic waves may be used to monitor the extent of tissue hyperthermia, coagulation, or freezing with high resolution and contrast. We studied real-time optoacoustic monitoring of thermal coagulation induced by conductive heating and laser radiation and cryoablation with liquid nitrogen. Q-switched Nd:YAG laser pulses were used as probing radiation to induce optoacoustic waves in tissues. Dramatic changes in optoacoustic signal parameters were detected during tissue freezing and coagulation due to sharp changes in tissue properties. The dimensions of thermally- induced lesions were measured in real time with the optoacoustic technique. Our studies demonstrated that the laser optoacoustic technique is capable of real-time monitoring of tissue coagulation and freezing front with submillimeter spatial resolution. This may allow accurate thermal ablation or cryotherapy of malignant and benign lesions with minimal damage to normal tissues.

Esenaliev, Rinat O.; Larina, Irina V.; Larin, Kirill V.; Motamedi, Massoud

2000-05-01

150

Real-Time Digital Watermarking System for  

E-print Network

the following modes: · Off-line mode: a file located in the host-PC is watermarked to create a new one file located in the host-PC is delivered to the target board, watermarked and played via the board's D on the JTAG connection, which caused a bottleneck for data transfer. In order to match real-time data transfer

Bruck, Jehoshua (Shuki)

151

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

152

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

153

The Real Time Display Builder (RTDB)  

NASA Technical Reports Server (NTRS)

The Real Time Display Builder (RTDB) is a prototype interactive graphics tool that builds logic-driven displays. These displays reflect current system status, implement fault detection algorithms in real time, and incorporate the operational knowledge of experienced flight controllers. RTDB utilizes an object-oriented approach that integrates the display symbols with the underlying operational logic. This approach allows the user to specify the screen layout and the driving logic as the display is being built. RTDB is being developed under UNIX in C utilizing the MASSCOMP graphics environment with appropriate functional separation to ease portability to other graphics environments. RTDB grew from the need to develop customized real-time data-driven Space Shuttle systems displays. One display, using initial functionality of the tool, was operational during the orbit phase of STS-26 Discovery. RTDB is being used to produce subsequent displays for the Real Time Data System project currently under development within the Mission Operations Directorate at NASA/JSC. The features of the tool, its current state of development, and its applications are discussed.

Kindred, Erick D.; Bailey, Samuel A., Jr.

1989-01-01

154

Real-time analysis of telemetry data  

NASA Technical Reports Server (NTRS)

This paper descibes a knowledge-based system for performing real-time monitoring and analysis of telemetry data from the NASA Hubble Space Telescope (HST). In order to handle asynchronous inputs and perform in real time the system consists of three or more separate processes, which run concurrently and communicate via a message passing scheme. The data management process gathers, compresses, and scales the incoming telemetry data befoe sending it to the other tasks. The inferencing process uses the incoming data to perform a real-time analysis of the state and health of the Space Telescope. The I/O process receives telemetry monitors from the data management process, updates its graphical displays in real time, and acts as the interface to the console operator. The three processes may run on the same or different computers. This system is currently under development and is being used to monitor testcases produced by the Bass Telemetry System in the Hardware/Software Integration Facility at Lockheed Missile and Space Co. in Sunnyvale, California.

Kao, Simon A.; Laffey, Thomas J.; Schmidt, James L.; Read, Jackson Y.; Dunham, Larry L.

1987-01-01

155

PETROBRAS Experience Implementing Real Time Optimization  

Microsoft Academic Search

PETROBRAS has defined Real Time Optimization (RTO) as a “High Sustainability” technology for downstream operations, due to its high economic return. Since 2001, RTO tools are being tested within the Company, either using in-house process simulators or, sometimes, using available commercial ones. This paper presents an overview of the PETROBRAS experiences on RTO, showing applications on Distillation and Fluidized Catalytic

Fábio S. Liporace; Marcos V. C. Gomes; Antônio C. Katata; Antônio C. Zanin; Lincoln F. L. Moro; Carlos R. Porfírio

2009-01-01

156

Real Time Animation and Illumination in Ancient  

Microsoft Academic Search

The present article discusses and details the methodological approaches and the reconstruction strategies that have been employed to realize the 3D real-time virtual simulations of the populated ancient sites of Aspendos and Pompeii, respectively visualized using a virtual and an augmented reality setup. More specifically, the two case studies to which we refer concern the VR restitution of the Roman

Roman Sites

157

Feyman path integrals in real time  

Microsoft Academic Search

The numerical calculation of Feynman path integrals (F.P.I.) can be performed in real time, i.e. without continuing to imaginary time, at least for quantum mechanical systems with a small number of degrees of freedom. The algorithm stems from the phase space formulation of the F.P.I. and makes intensive use of the Fast Fourier transform to achieve the required efficiency. Scope

Enrico Onofri; Gian Pietro Tecchiolli

1988-01-01

158

The NERO Real-time Video Game  

Microsoft Academic Search

In most modern video games, character behavior is scripted; no matter how many times the player exploits a weakness, that weakness is never repaired. Yet if game characters could learn through interacting with the player, behavior could improve as the game is played, keeping it interesting. This paper introduces the real-time NeuroEvolution of Augmenting Topologies (rtNEAT) method for evolving increasingly

Kenneth O. Stanley; Bobby D. Bryant

159

Supervisory Control of Real-Time Systems Using Prioritized Synchronization  

E-print Network

information. The event timing information must also be retained when the design objective involves real-timeSupervisory Control of Real-Time Systems Using Prioritized Synchronization Ratnesh Kumar event systems is extended to the real-time setting. The real-time behavior of a system is represented

Kumar, Ratnesh

160

Comparing Caching Techniques for Multitasking RealTime Systems  

E-print Network

. Real­time operating systems need to know the timing behavior of applications to ensure correct real­time constraint, or deadline, can result in a catastrophic failure. The real­time operating system (RTOS) mustComparing Caching Techniques for Multitasking Real­Time Systems Steve Dropsho Chip Weems dropsho

Massachusetts at Amherst, University of

161

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

162

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

163

Optimal checkpointing of real-time tasks  

NASA Technical Reports Server (NTRS)

Analytical models for the design and evaluation of checkpointing of real-time tasks are developed. First, the execution of a real-time task is modeled under a common assumption of perfect coverage of on-line detection mechanisms (which is termed a basic model). Then, the model is generalized (to an extended model) to include more realistic cases, i.e., imperfect coverages of on-line detection mechanisms and acceptance tests. Finally, an optimal placement of checkpoints is determined to minimize the mean task execution time while the probability of an unreliable result (or lack of confidence) is kept below a specified level. In the basic model, it is shown that equidistant intercheckpoint intervals are optimal, whereas this is not necessarily true in the extended model. An algorithm for calculating the optimal number of checkpoints and intercheckpoint intervals is presented with some numerical examples for the extended model.

Shin, Kang G.; Lin, Tein-Hsiang; Lee, Yann-Hang

1987-01-01

164

Real time: further misconceptions (or half-truths) [real-time systems  

Microsoft Academic Search

J.A. Stankovic (see ibid., vol. 21, no. 10, p. 10-19, 1988) analyzed some common misconceptions about real-time computing. His analysis addressed the very notion of real-time computing and touched upon the applicability of concepts that have proven useful in nonreal-time modeling of reactive systems, such as interleaving models, nondeterminism, and fairness. From his viewpoint, such concepts are no longer appropriate

Reino Kurki-Suonio

1994-01-01

165

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

166

Modular Design of Real-Time Systems Using Hierarchical Communicating Real-time State Machines  

Microsoft Academic Search

This paper proposes a methodology for the development of distributed real-time systems. The methodology consists of the Hierarchical\\u000a Communicating Real-Time State Machines (H-CRSM) modelling language, and the Violin toolset. H-CRSM combines Statecharts constructs with CSP-like timed communications. Violin provides a visual environment supporting in a seamless way all the life-cycle development phases of an H-CRSM system. Temporal\\u000a validation rests on

Angelo Furfaro; Libero Nigro; Francesco Pupo

2006-01-01

167

Mechanically scanned real-time passive millimeter-wave imaging at 94 GHz  

NASA Astrophysics Data System (ADS)

It is well known that millimetre wave systems can penetrate poor weather and battlefield obscurants far better than infrared or visible systems. Thermal imaging in this band offers the opportunity for passive surveillance and navigation, allowing military operations in poor weather. We have previously reported a novel real time mechanically scanned passive millimetre wave imager operating at 35GHz and in this paper a 94GHz variant will be described. This 94GHz imager has a field-of-view of 60° x 30° and has diffraction limited performance over the central two thirds of this field-of-view. It is relatively inexpensive because the scene is imaged using a linear array of direct detection receivers and compact folded optics. The receiver array has been constructed using indium phosphide monolithic microwave integrated circuits (MMICs) allowing high gain and low noise figure to be achieved. The compact optics consist of a polarisation sensitive mirror and a Faraday rotator. readily The mirror is constructed from expanded polystyrene, supporting a printed copper grid etched onto a PTFE/glass fibre substrate. These materials are low cost and readily available. The Faraday rotator is made from a commercial grade plasto-ferrite sandwiched between antireflection coatings. The optics produce a conical scan pattern and image processing is used to generate a raster scan pattern and to perform gain and offset corrections.

Appleby, Roger; Anderton, Rupert N.; Price, Sean; Salmon, Neil A.; Sinclair, Gordon N.; Coward, Peter R.; Barnes, Andrew R.; Munday, P. D.; Moore, M.; Lettington, Alan H.; Robertson, Duncan A.

2003-08-01

168

Real-Time Seismology in Portugal  

NASA Astrophysics Data System (ADS)

Portugal is located next to the plate boundary between Eurasia (Iberia) and Africa (Nubia). The country has been repeatedly affected by some of the largest earthquakes, both onshore and offshore, in the historical European record, including the largest historical European earthquake, the great Lisbon earthquake of 1755 (~M8.5). The Portuguese territory has suffered directly the consequences of strong ground shaking (collapse of buildings, etc) and also some of the most destructive consequences of earthquakes (e.g. tsunamis, fires, etc). However, the rate of tectonic deformation in the Portuguese territory is low (the Eurasian-African plates converge at a rate of ~ 5 mm/yr), which results in long recurrence intervals between earthquakes. This low to moderate rate of seismic activity has two major negative effects: 1) it is difficult to study the regional seismo-tectonics with traditional passive methods; 2) the population is little aware of earthquake risk and unprepared to react in case of disaster. In this scenario, real-time seismology is key to monitoring earthquake crisis in real-time, providing early warnings about potentially destructive events, and assisting in the channeling of recovery efforts in case of disaster. In this paper we will present the real-time algorithms implemented at Instituto de Meteorologia (IM), the institution responsible for seismic monitoring in Portugal. In particular, we will focus on the following aspects: 1) Data collection and real-time transmission to the headquarters. Broadband seismological stations are owned and operated by five different institutions. The last years have witnessed an effort for integration, and presently most data arrives at IM lab in real-time. 2) Earthquake location and local magnitude determination. Data is automatically analyzed in order to obtain a first earthquake hypocenter and ML. While this process is mostly automatic, it still requires the revision by an operator, who is available 24h. 3) Production of maps of ground shaking. Shakemaps are automatically produced based on the incoming data. We have calibrated Shakemaps taking into account regional attenuation laws and site effects. We have also developed a new tool to assess the uncertainty in Shakemaps, by considering different attenuation laws and site conditions proposed in the literature. 4) Moment tensor inversion. We use two different algorithms to compute moment tensor, determine focal mechanism, and infer true rupture plane. One of the algorithms - KIWI - runs automatically, with no human intervention. The other - ISOLA - requires manual input and is used as a double check on the results obtained with KIWI. One of the next steps is to link the real-time seismic system with the tsunami early warning system.

Custodio, S.; Marreiros, C.; Carvalho, S.; Vales, D.; Lima, V.; Carrilho, F.

2012-12-01

169

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

170

Practical Real-Time Computing System for Biomedical Experiment Interface  

Microsoft Academic Search

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

David J. Christini; Kenneth M. Stein; Steven M. Markowitz; Bruce B. Lerman

1999-01-01

171

Real-time Extensions for the Fiacre modeling language  

E-print Network

to the consistent increase in design complexity of real-time embedded software. While verification activities shouldReal-time Extensions for the Fiacre modeling language Nouha Abid Silvano Dal Zilio CNRS ; LAAS ; 7 of the Fiacre language with real-time con- structs and real-time verification patterns. Fiacre is a formal

Paris-Sud XI, Université de

172

Measuring OS Support for Real-time CORBA ORBs  

E-print Network

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-Oriented Systems, Operating System QoS Support, Real-time CORBA Object Request Bro- ker 1 Introduction There has

Schmidt, Douglas C.

173

Real-time RTPCR for identification of differentially  

E-print Network

Real-time RT­PCR for identification of differentially expressed genes. (with Schizophrenia application) Rolf Sundberg, Stockholm Univ. Göteborg, May 2006 #12;"Real-time PCR for mRNA quantitation" Review paper (Wong & Medrano, 2005) citations: Real-time PCR and real-time RT­PCR has dramatically

Sundberg, Rolf

174

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

175

System Equivalent for Real Time Digital Simulator  

NASA Astrophysics Data System (ADS)

The purpose of this research is to develop a method of making system equivalents for the Real Time Digital Simulator (RTDS), which should enhance its capability of simulating large power systems. The proposed equivalent combines a Frequency Dependent Network Equivalent (FDNE) for the high frequency electromagnetic transients and a Transient Stability Analysis (TSA) type simulation block for the electromechanical transients. The frequency dependent characteristic for FDNE is obtained by curve-fitting frequency domain admittance characteristics using the Vector Fitting method. An approach for approximating the frequency dependent characteristic of large power networks from readily available typical power-flow data is also introduced. A new scheme of incorporating TSA solution in RTDS is proposed. This report shows how the TSA algorithm can be adapted to a real time platform. The validity of this method is confirmed with examples, including the study of a multi in-feed HVDC system based network.

Lin, Xi

2011-07-01

176

Real-Time Imaging of Quantum Entanglement  

PubMed Central

Quantum Entanglement is widely regarded as one of the most prominent features of quantum mechanics and quantum information science. Although, photonic entanglement is routinely studied in many experiments nowadays, its signature has been out of the grasp for real-time imaging. Here we show that modern technology, namely triggered intensified charge coupled device (ICCD) cameras are fast and sensitive enough to image in real-time the effect of the measurement of one photon on its entangled partner. To quantitatively verify the non-classicality of the measurements we determine the detected photon number and error margin from the registered intensity image within a certain region. Additionally, the use of the ICCD camera allows us to demonstrate the high flexibility of the setup in creating any desired spatial-mode entanglement, which suggests as well that visual imaging in quantum optics not only provides a better intuitive understanding of entanglement but will improve applications of quantum science. PMID:23715056

Fickler, Robert; Krenn, Mario; Lapkiewicz, Radek; Ramelow, Sven; Zeilinger, Anton

2013-01-01

177

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

178

Real-time phase shift interference microscopy.  

PubMed

A real-time phase shift interference microscopy system is presented using a polarization-based Linnik interferometer operating with three synchronized, phase-masked, parallel detectors. Using this method, several important applications that require high speed and accuracy, such as dynamic focusing control, tilt measurement, submicrometer roughness measurement, and 3D profiling of fine structures, are demonstrated in 50 volumes per second and with 2 nm height repeatability. PMID:25166114

Safrani, Avner; Abdulhalim, Ibrahim

2014-09-01

179

Real-time monitoring system for microfluidics  

Microsoft Academic Search

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

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

2007-01-01

180

REAL-TIME COMMUNICATION IN AN INTERNETWORK  

Microsoft Academic Search

Can end-to-end communication performance be guaranteed by a packet-switching internetwork? This paper addresses the question by examining the feasibility of extending to an internetwork the Tenet approach to real-time communication service design. The conditions to be satisfied by an internetwork so that the approach can be extended to it are investigated. These include conditions for the scheduling discip- line to

Domenico Ferrari

1992-01-01

181

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

182

Real-Time Object Detection for \\  

Microsoft Academic Search

This paper presents an efficient shape-based object detectionmethod based on Distance Transforms and describesits use for real-time vision on-board vehicles.The method uses a template hierarchy to capture thevariety of object shapes# efficient hierarchies can begenerated offline for given shape distributions usingstochastic optimization techniques (i.e. simulated annealing). Online, matching involves a simultaneouscoarse-to-fine approach over the shape hierarchy andover the...

Dariu Gavrila; Vasanth Philomin

1999-01-01

183

Real-time dynamics for interactive environments  

E-print Network

of MASTER OF SCIENCE Approved by: Chair of Committee, Donald House Committee Members, Frederic Parke John Keyser Head of Department, Mark Clayton December 2007 Major Subject: Visualization Sciences iii ABSTRACT Real-time Dynamics for Interactive Environments..., for his help and guidance with this thesis; Dr. Frederic Parke for the Immersive Visualization Project at Texas A&M University and his help with the immersive engine; and Dr. John Keyser for introducing me to physically based simulation. I would also like...

Timchenko, Alexander Nikolai

2008-10-10

184

Real-time dynamics for interactive environments  

E-print Network

of MASTER OF SCIENCE Approved by: Chair of Committee, Donald House Committee Members, Frederic Parke John Keyser Head of Department, Mark Clayton December 2007 Major Subject: Visualization Sciences iii ABSTRACT Real-time Dynamics for Interactive Environments..., for his help and guidance with this thesis; Dr. Frederic Parke for the Immersive Visualization Project at Texas A&M University and his help with the immersive engine; and Dr. John Keyser for introducing me to physically based simulation. I would also like...

Timchenko, Alexander Nikolai

2009-05-15

185

Real-Time Photoplethysmography Imaging System  

Microsoft Academic Search

\\u000a Real-time non-contact photoplethysmography imaging (PPGI) system for high-resolution blood perfusion mapping in human skin\\u000a has been proposed. The PPGI system comprises of LED lamp, webcam and computer with video processing software. The purpose\\u000a of this study is to evaluate the reliability of the PPGI system when measuring blood perfusion. The validation study of PPGI\\u000a and laser-Doppler perfusion imager (LDPI) was

U. Rubins; V. Upmalis; O. Rubenis; D. Jakovels; J. Spigulis

186

Supporting Real-Time Traffic on Ethernet  

Microsoft Academic Search

Ethernet has been the dominant local area network architecturein the last decade, and we believe that it willcontinue to be so because of its cost-effectiveness andthe availability of higher-bandwidth Ethernets. Wepropose and evaluate a software-based protocol calledRETHER (Real-time ETHERnet) that provides realtimeperformance guarantees to multimedia applications without modifying existing Ethernet hardware.RETHER features a hybrid mode of operation to reducethe performance

Chitra Venkatramani; Tzi-cker Chiueh

1994-01-01

187

A real-time ISEE data system  

NASA Technical Reports Server (NTRS)

A real time International Sun Earth Explorer (ISEE) data system directed toward the prediction of geomagnetic substorms and storms is discussed in detail. Such a system may allow up to 60 minutes or more, advance warning of magnetospheric substorms and up to 30 minute warnings of geomagnetic storms induced by high speed streams and solar flares. The proposed system utilizes existing capabilities of several agencies thereby minimizing costs.

Tsurutani, B. T.; Baker, D. N.

1979-01-01

188

Real Time Monitoring: Achieving Energy Efficiency  

E-print Network

ABSTRACT: IECBO?s International Conference for Enhanced Building Operations November 17-18, 2009 Austin, Texas. Energy @ Work www.Energy-Efficiency.com File: Rouse_ Abstract Contact: scott.rouse@energy-efficiency....com, (416) 402-0525 Proposal Type: o Electronic proposal for presentation Title of Paper: o Real Time Monitoring: Achieving Energy Efficiency! Conference: o ICEBO?s International Conference for Enhanced Building Operations Submitted by: o...

Rouse, S.

189

Real-time radiographic inspection facility  

NASA Technical Reports Server (NTRS)

A real time radiographic inspection facility has been developed for nondestructive evaluation applications. It consists of an X-ray source, an X-ray sensitive television imaging system, an electronic analog image processing system, and a digital image processing system. The digital image processing system is composed of a computer with the necessary software to drive the overall facility. Descriptions are given of the design strategy, the facility's components, and its current capabilities.

Roberts, E., Jr.

1977-01-01

190

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

191

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

192

Real-Time Cloud Rendering for Games  

Microsoft Academic Search

This paper presents a method for realistic real-time rendering of clouds for flight simulators and games. It describes a cloud illumination algorithm that approximates multiple forward scattering in a preprocess, and first order anisotropic scattering at runtime. Impostors are used to accelerate cloud rendering by exploiting frame-to-frame coherence in an interactive flight simulation. Impostors are particularly well suited to clouds,

Mark J. Harris

2002-01-01

193

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

194

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

195

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

196

Raptor -- Mining the Sky in Real Time  

NASA Astrophysics Data System (ADS)

The primary goal of Raptor is ambitious: to identify interesting optical transients from very wide field of view telescopes in real time, and then to quickly point the higher resolution Raptor ``fovea'' cameras and spectrometer to the location of the optical transient. The most interesting of Raptor's many applications is the real-time search for orphan optical counterparts of Gamma Ray Bursts. The sequence of steps (data acquisition, basic calibration, source extraction, astrometry, relative photometry, the smarts of transient identification and elimination of false positives, telescope pointing feedback...) is implemented with a ``component'' aproach. All basic elements of the pipeline functionality have been written from scratch or adapted (as in the case of SExtractor for source extraction) to form a consistent modern API operating on memory resident images and source lists. The result is a pipeline which meets our real-time requirements and which can easily operate as a monolithic or distributed processing system. Finally: the Raptor architecture is entirely based on free software (sometimes referred to as "open source" software). In this paper we also discuss the interplay between various free software technologies in this type of astronomical problem.

Galassi, M.; Borozdin, K.; Casperson, D.; McGowan, K.; Starr, D.; White, R.; Wozniak, P.; Wren, J.

2004-06-01

197

The Raptor Real-Time Processing Architecture  

NASA Astrophysics Data System (ADS)

The primary goal of Raptor is ambitious: to identify interesting optical transients from very wide field of view telescopes in real time, and then to quickly point the higher resolution Raptor ``fovea'' cameras and spectrometer to the location of the optical transient. The most interesting of Raptor's many applications is the real-time search for orphan optical counterparts of Gamma Ray Bursts. The sequence of steps (data acquisition, basic calibration, source extraction, astrometry, relative photometry, the smarts of transient identification and elimination of false positives, telescope pointing feedback, etc.) is implemented with a ``component'' approach. All basic elements of the pipeline functionality have been written from scratch or adapted (as in the case of SExtractor for source extraction) to form a consistent modern API operating on memory resident images and source lists. The result is a pipeline which meets our real-time requirements and which can easily operate as a monolithic or distributed processing system. Finally, the Raptor architecture is entirely based on free software (sometimes referred to as ``open source'' software). In this paper we also discuss the interplay between various free software technologies in this type of astronomical problem.

Galassi, M.; Starr, D.; Wozniak, P.; Brozdin, K.

198

Real-Time fMRI Paradigm Control, Physiology, and Behavior Combined with Near Real-Time Statistical Analysis  

Microsoft Academic Search

This study presents an integrated approach to on-line fMRI data processing that combines real-time paradigm control and real-time MR image statistical analysis with nearly real-time integration of fMRI behavioral and physiological data. The real-time paradigms involve accurate timing control of multiple independent processing streams for stimulus presentation, physiological monitoring, behavioral response recording, and scanner synchronization. The real-time image analysis provides

James T. Voyvodic

1999-01-01

199

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

200

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

2012-03-20

201

Improved real-time photogrammetric stitching  

NASA Astrophysics Data System (ADS)

This work extends earlier work on the real-time photogrammetric stitching of staring arrays of high resolution videos on commercial off the shelf hardware. The blending is both further optimised for Graphics Processor Unit (GPU) implementation and extended from one to two dimensions to allow for multiple layers or arbitrary arrangements of cameras. The incorporation of stabilisation inputs allows the stitching algorithm to provide space stabilised panoramas. The final contribution is to decrease the sensitivity to depth of the stitching procedure, especially for wide aperture baselines. Finally timing tests and some resultant stitched panoramas are presented and discussed.

de Villiers, Jason; Cronje, Jaco

2013-05-01

202

Study of Real-time Scheduling Model and Real-time Scheduling Algorithms with Fault-Tolerance  

E-print Network

design and another is for software, are quite useful in the distributed real-time applications. When design and implement distributed real-time system, first design hardware and then deign softwareStudy of Real-time Scheduling Model and Real-time Scheduling Algorithms with Fault-Tolerance Xiao

Qin, Xiao

203

It is Time to Get Real with Real-Time: In Search of the Balance between Tools, Patterns and Aspects  

E-print Network

demands for real-time systems are vastly outstripping the ability for developers to robustly design in the design of a programming model for real-time systems. The model integrates the RTSJ abstractionsIt is Time to Get Real with Real-Time: In Search of the Balance between Tools, Patterns and Aspects

Zhao, Tian

204

Study of Real-time Scheduling Model and Real-time Scheduling Algorithms with Fault-Tolerance  

E-print Network

ideas, some tools based on other operating systems can also be designed. Key Words: Distributed real-time-headed disk system and two-headed mirrored disk systems are illustrated. After presenting non real-time disk real-time algorithms when serving real-time I/O requests. Two-headed mirrored disk system can

Qin, Xiao

205

A Real-Time Push-Pull Communications Model for Distributed Real-Time and Multimedia Systems  

E-print Network

A Real-Time Push-Pull Communications Model for Distributed Real-Time and Multimedia Systems Kanaka Communication, Distributed Systems, Real-Time Systems, QoS, Proxy, End-to-End delay, Multimedia Systems. #12;Abstract Real-time and multimedia applications like multi-party collaboration, internet telephony

206

A RealTime PushPull Communications Model for Distributed RealTime and Multimedia Systems  

E-print Network

A Real­Time Push­Pull Communications Model for Distributed Real­Time and Multimedia Systems Kanaka; Keywords: Push Communication, Pull Communication, Distributed Systems, Real­Time Systems, QoS, Proxy, End­to­End delay, Multimedia Systems. #12; Abstract Real­time and multimedia applications like multi

207

Machine learning for real time remote detection  

NASA Astrophysics Data System (ADS)

Infrared systems are key to providing enhanced capability to military forces such as automatic control of threats and prevention from air, naval and ground attacks. Key requirements for such a system to produce operational benefits are real-time processing as well as high efficiency in terms of detection and false alarm rate. These are serious issues since the system must deal with a large number of objects and categories to be recognized (small vehicles, armored vehicles, planes, buildings, etc.). Statistical learning based algorithms are promising candidates to meet these requirements when using selected discriminant features and real-time implementation. This paper proposes a new decision architecture benefiting from recent advances in machine learning by using an effective method for level set estimation. While building decision function, the proposed approach performs variable selection based on a discriminative criterion. Moreover, the use of level set makes it possible to manage rejection of unknown or ambiguous objects thus preserving the false alarm rate. Experimental evidences reported on real world infrared images demonstrate the validity of our approach.

Labbé, Benjamin; Fournier, Jérôme; Henaff, Gilles; Bascle, Bénédicte; Canu, Stéphane

2010-10-01

208

Temporal protection in real-time operating systems  

Microsoft Academic Search

Real-time systems manipulate data types with inherent timing constraints. Priority-based scheduling is a popular approach to build hard real-time systems, when the timing requirements, supported run-time configurations, and task sets are known a priori. Future real-time systems will need to support these hard real-time constraints but in addition (a) provide friendly user and programming interfaces with audio and video data

Cliff Mercer; Ragunathan Rajkumar; Jim Zelenka

1994-01-01

209

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

210

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

211

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

212

Real-Time Analysis of Round-based Distributed Algorithms  

E-print Network

real-time systems requires a scientific basis, which allows to cope with three very different existing real-time scheduling approaches, is replaced by a message-driven in- vocation. (3) Timing aspects

213

Modeling of Real-Time System Designs for Parametric Analysis  

Microsoft Academic Search

In designing real time software, system designers need to find out the time budget to allocate to each action of real time tasks so that the tasks can meet their deadlines. Our solution to this problem involves representing the execution time of the actions as parameters, then analyzing the collaborative behavior of those real time tasks. This paper proposes parametric

Chaiwat Sathawornwichit; Toshiaki Aoki; Takuya Katayama

2010-01-01

214

Real-time image visualization for sensors  

NASA Astrophysics Data System (ADS)

Real-time image visualization simulation for sensors operating against synthetic environments comprised of natural backgrounds, cultural features, mobile objects, and dynamic weather is now a reality. A commercial software product is available which is capable of providing sensor image visualization for any spectral filter from the visible through the far infrared. The produce is called SensorVisionTM and is a module of a product called VegaTM. It is built upon IRIS PerformerTM and OpenGLTM software and is targeted for use on Silicon Graphics OnyxTM computers with InfiniteRealityTM or RealityEngine2TM graphics hardware. Vega with SensorVision is ideally suited to provide the scene image input to a real-time hardware-in-the-loop sensor simulation ranging from image intensified night vision goggles, to midwave FLIRs, to longwave FLIRs. SensorVision images are quantitative (each image pixel is expressed in watts/cm2/steradian), are computed in real-time, and represent the diurnal effects of weather (including surface temperature variation) on scene images. This paper presents the radiometric processes and algorithms used by the software when computing its output images and discusses the use of the software in hardware-in-the-loop simulation. The paper also highlights software capabilities and features, e.g.: Images include reflection from sun/moon and ambient sky illumination, and thermal emission from extended polygons with radiometric shading between vertices, and atmospheric attenuation and path radiance with pixel line- of-sight variability; Polygon surface temperatures of natural backgrounds and cultural features are computed asynchronously and continuously updated throughout diurnal cycle; Polygons are radiometrically textured and spatially correlated with visible RGB textures.

Anding, David C.; Szabo, Alexander

1996-05-01

215

Generalization of Faraday's Law to Include Nonconservative Spin Forces  

NASA Astrophysics Data System (ADS)

The usual Faraday’s Law E=-d?/dt determines an electromotive force E which accounts only for forces resulting from the charge of electrons. In ferromagnetic materials, in general, there exist nonconservative spin forces which also contribute to E. These might be included in Faraday’s Law if the magnetic flux ? is replaced by [?/(-e)]?, where ? is a Berry phase suitably averaged over the electron spin direction. These contributions to E represent the requirements of energy conservation in itinerant ferromagnets with time dependent order parameters.

Barnes, S. E.; Maekawa, S.

2007-06-01

216

A Flexible Real-Time Architecture  

SciTech Connect

Assuring hard real-time characteristics of I/O associated with embedded software is often a difficult task. Input-Output related statements are often intermixed with the computational code, resulting in I/O timing that is dependent on the execution path and computational load. One way to mitigate this problem is through the use of interrupts. However, the non-determinism that is introduced by interrupt driven I/O may be so difficult to analyze that it is prohibited in some high consequence systems. This paper describes a balanced hardware/software solution to obtain consistent interrupt-free I/O timing, and results in software that is much more amenable to analysis.

WICKSTROM,GREGORY L.

2000-08-17

217

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

218

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

219

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

220

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

221

Real-Time Reed-Solomon Decoder  

NASA Technical Reports Server (NTRS)

Generic Reed-Solomon decoder fast enough to correct errors in real time in practical applications designed to be implemented in fewer and smaller very-large-scale integrated, VLSI, circuit chips. Configured to operate in pipelined manner. One outstanding aspect of decoder design is that Euclid multiplier and divider modules contain Galoisfield multipliers configured as combinational-logic cells. Operates at speeds greater than older multipliers. Cellular configuration highly regular and requires little interconnection area, making it ideal for implementation in extraordinarily dense VLSI circuitry. Flight electronics single chip version of this technology implemented and available.

Maki, Gary K.; Cameron, Kelly B.; Owsley, Patrick A.

1994-01-01

222

Analog video magnetograms in real time.  

NASA Technical Reports Server (NTRS)

Description of a video differential photometer which is the result of an attempt to adapt television technology to the task of producing an electronic equivalent of the photographic subtraction technique. Advantages of electronic subtraction are potentially greater field sensitivity, immediate availability of the subtracted magnetograms (virtually in real time), and greater versatility in combining and comparing image data. Commercial television equipment was used in construction of the apparatus. All video subtraction, averaging, and other processing is done in analog form. The final magnetogram is displayed on an ordinary television monitor.

Smithson, R. C.; Leighton, R. B.

1971-01-01

223

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

224

Baton Rouge Complex Steam Real Time Optimization  

E-print Network

” Device, and all other product names used herein are trademarks of ExxonMobil unless indicated otherwise. ESL-IE-14-05-32 Proceedings of the Thrity-Sixth Industrial Energy Technology Conference New Orleans, LA. May 20-23, 2014 Proprietary 11 Questions...Baton Rouge Complex Steam Real Time Optimization IETC 2014 New Orleans, Louisiana Tope Iyun ExxonMobil Chemical Company May 22, 2014 ESL-IE-14-05-32 Proceedings of the Thrity-Sixth Industrial Energy Technology Conference New Orleans, LA. May 20...

Iyun, T.

2014-01-01

225

Real-time draping and perspective correction  

NASA Astrophysics Data System (ADS)

Draping an aerial photograph over known elevation data enables simulated views of the same area from an arbitrary point of view. Doing this in software for a high resolution image could take days. Commercial hardware is available to do this in hours. This paper will present a method for doing it in seconds. Similarly, comparing two images of the same target which have been taken from different altitudes or directions requires one or both images undergo perspective correction. Perspective correction is a computation intensive process made even more complex when the images cover mountainous terrain. This paper will describe hardware that can in real time eliminate the perspective difference between two such images.

Gordon, Donald P.

2000-11-01

226

Open Source Real Time Operating Systems Overview  

SciTech Connect

Modern control systems applications are often built on top of a real time operating system (RTOS) which provides the necessary hardware abstraction as well as scheduling, networking and other services. Several open source RTOS solutions are publicly available, which is very attractive, both from an economic (no licensing fees) as well as from a technical (control over the source code) point of view. This contribution gives an overview of the RTLinux and RTEMS systems (architecture, development environment, API etc.). Both systems feature most popular CPUs, several APIs (including Posix), networking, portability and optional commercial support. Some performance figures are presented, focusing on interrupt latency and context switching delay.

Straumann, Till

2001-12-11

227

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

228

Real-time data flow and product generating for GNSS  

NASA Technical Reports Server (NTRS)

The last IGS workshop with the theme 'Towards Real-Time' resulted in the design of a prototype for real-time data and sharing within the IGS. A prototype real-time network is being established that will serve as a test bed for real-time activities within the IGS. We review the developments of the prototype and discuss some of the existing methods and related products of real-time GNSS systems. Recommendations are made concerning real-time data distribution and product generation.

Muellerschoen, Ronald J.; Caissy, Mark

2004-01-01

229

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

230

Residential Real-time Price Response Simulation  

SciTech Connect

The electric industry is gaining experience with innovative price responsive demand pilots and limited roll-outs to customers. One of these pilots is investigating real-time pricing signals to engage end-use systems and local distributed generation and storage in a distributed optimization process. Attractive aspects about the approach include strong scalability characteristics, simplified interfaces between automation devices, and the adaptability to integrate a wide variety of devices and systems. Experience in this nascent field is revealing a rich array of for engineering decisions and the application of complexity theory. To test the decisions, computer simulations are used to reveal insights about design, demand elasticity, and the limits of response (including consumer fatigue). Agent-based approaches lend themselves well in the simulation to modeling the participation and interaction of each piece of equipment on a distribution feeder. This paper discusses rate design and simulation experiences at the distribution feeder level where consumers and their HVAC systems and water heaters on a feeder receive real-time pricing signals.

Widergren, Steven E.; Subbarao, Krishnappa; Chassin, David P.; Fuller, Jason C.; Pratt, Robert G.

2011-10-10

231

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

232

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

233

Real-time sensor data validation  

NASA Technical Reports Server (NTRS)

This report describes the status of an on-going effort to develop software capable of detecting sensor failures on rocket engines in real time. This software could be used in a rocket engine controller to prevent the erroneous shutdown of an engine due to sensor failures which would otherwise be interpreted as engine failures by the control software. The approach taken combines analytical redundancy with Bayesian belief networks to provide a solution which has well defined real-time characteristics and well-defined error rates. Analytical redundancy is a technique in which a sensor's value is predicted by using values from other sensors and known or empirically derived mathematical relations. A set of sensors and a set of relations among them form a network of cross-checks which can be used to periodically validate all of the sensors in the network. Bayesian belief networks provide a method of determining if each of the sensors in the network is valid, given the results of the cross-checks. This approach has been successfully demonstrated on the Technology Test Bed Engine at the NASA Marshall Space Flight Center. Current efforts are focused on extending the system to provide a validation capability for 100 sensors on the Space Shuttle Main Engine.

Bickmore, Timothy W.

1994-01-01

234

An efficient real time superresolution ASIC system  

NASA Astrophysics Data System (ADS)

Superresolution of images is an important step in many applications like target recognition where the input images are often grainy and of low quality due to bandwidth constraints. In this paper, we present a real-time superresolution application implemented in ASIC/FPGA hardware, and capable of 30 fps of superresolution by 16X in total pixels. Consecutive frames from the video sequence are grouped and the registered values between them are used to fill the pixels in the higher resolution image. The registration between consecutive frames is evaluated using the algorithm proposed by Schaum et al. The pixels are filled by averaging a fixed number of frames associated with the smallest error distances. The number of frames (the number of nearest neighbors) is a user defined parameter whereas the weights in the averaging process are decided by inverting the corresponding smallest error distances. Wiener filter is used to post process the image. Different input parameters, such as size of input image, enlarging factor and the number of nearest neighbors, can be tuned conveniently by the user. We use a maximum word size of 32 bits to implement the algorithm in Matlab Simulink as well as the hardware, which gives us a fine balance between the number of bits and performance. The algorithm performs with real time speed with very impressive superresolution results.

Reddy, Dikpal; Yue, Zhanfeng; Topiwala, Pankaj

2008-04-01

235

Real-time computerized annotation of pictures.  

PubMed

Developing effective methods for automated annotation of digital pictures continues to challenge computer scientists. The capability of annotating pictures by computers can lead to breakthroughs in a wide range of applications, including Web image search, online picture-sharing communities, and scientific experiments. In this work, the authors developed new optimization and estimation techniques to address two fundamental problems in machine learning. These new techniques serve as the basis for the Automatic Linguistic Indexing of Pictures - Real Time (ALIPR) system of fully automatic and high speed annotation for online pictures. In particular, the D2-clustering method, in the same spirit as k-means for vectors, is developed to group objects represented by bags of weighted vectors. Moreover, a generalized mixture modeling technique (kernel smoothing as a special case) for non-vector data is developed using the novel concept of Hypothetical Local Mapping (HLM). ALIPR has been tested by thousands of pictures from an Internet photo-sharing site, unrelated to the source of those pictures used in the training process. Its performance has also been studied at an online demo site where arbitrary users provide pictures of their choices and indicate the correctness of each annotation word. The experimental results show that a single computer processor can suggest annotation terms in real-time and with good accuracy. PMID:18421105

Li, Jia; Wang, James Z

2008-06-01

236

Real-time sensor data validation  

NASA Astrophysics Data System (ADS)

This report describes the status of an on-going effort to develop software capable of detecting sensor failures on rocket engines in real time. This software could be used in a rocket engine controller to prevent the erroneous shutdown of an engine due to sensor failures which would otherwise be interpreted as engine failures by the control software. The approach taken combines analytical redundancy with Bayesian belief networks to provide a solution which has well defined real-time characteristics and well-defined error rates. Analytical redundancy is a technique in which a sensor's value is predicted by using values from other sensors and known or empirically derived mathematical relations. A set of sensors and a set of relations among them form a network of cross-checks which can be used to periodically validate all of the sensors in the network. Bayesian belief networks provide a method of determining if each of the sensors in the network is valid, given the results of the cross-checks. This approach has been successfully demonstrated on the Technology Test Bed Engine at the NASA Marshall Space Flight Center. Current efforts are focused on extending the system to provide a validation capability for 100 sensors on the Space Shuttle Main Engine.

Bickmore, Timothy W.

1994-04-01

237

The real-time operating system of MARS  

Microsoft Academic Search

This paper gives a short overview of the architecture of the distributed real-time system MARS (MAintainable Real-Time System) and describes the design and implementation of its operating system. The main purpose of the MARS kernel is to achieve a timely execution of hard real-time tasks and to provide an efficient communication mechanism suitable for distributed real-time systems.

Andreas Damm; J. Reisinger; W. Schwabl; Hermann Kopetz

1989-01-01

238

Requirements specification of distributed hard real-time operating systems  

Microsoft Academic Search

The authors present the requirements specification for distributed hard real-time operating systems used in time-critical, mission-oriented systems. For this purpose the relevant models for distributed hard real-time processing are established based on the general characteristics of distributed hard real-time systems. Following these models the requirements of a distributed hard real-time operating system are specified, and the major concerns in requirements

ManSang Chung; Heonshik Shin

1991-01-01

239

Real-Time Data Services for Cyber Physical Systems  

Microsoft Academic Search

Cyber Physical Systems (CPSs) have grand visions with great socio-economic impacts such as blackout-free electricity supply and real-time disaster recovery. A key challenge is providing real-time data services for CPSs. Existing real-time data management techniques and wireless sensor networks (WSNs) fall far short to support timely, secure real-time data services for CPSs. In this paper, we present a novel information-centric

Kyoung-don Kang; Sang Hyuk Son

2008-01-01

240

Real Time Control Design for Mobile Robot Fault Tolerant Control.  

E-print Network

Real Time Control Design for Mobile Robot Fault Tolerant Control. Introducing the ARTEMIC Powered the challenge to ensure fault tolerant real-time control of a self designed and built wheeled differential://robotics.viviti.com Abstract - Real-time applications should timely deliver synchronized data-sets, minimize latency and jitter

Kuehnlenz, Kolja

241

DATAFLOW ANALYSIS FOR REAL-TIME EMBEDDED MULTIPROCESSOR SYSTEM  

E-print Network

Chapter 4 DATAFLOW ANALYSIS FOR REAL-TIME EMBEDDED MULTIPROCESSOR SYSTEM DESIGN Marco Bekooij1, Rob the number of design iterations and shorten the design time of real-time embedded network based multiproces. Keywords: real-time, dataflow analysis, multiprocessor system, predictable design, system- on-chip 1

Gheorghita, Valentin

242

COMPOSITIONAL FRAMEWORK FOR REAL-TIME EMBEDDED SYSTEMS A DISSERTATION  

E-print Network

-constrained real-time systems, i.e., the system-level design and analysis on the timing and resource aspects can develop techniques for supporting the compositional design and analysis of resource-constrained real-timeCOMPOSITIONAL FRAMEWORK FOR REAL-TIME EMBEDDED SYSTEMS Insik Shin A DISSERTATION in Computer

Plotkin, Joshua B.

243

Predictability and Consistency in RealTime Database Systems  

E-print Network

Chapter 21 Predictability and Consistency in Real­Time Database Systems Young­Kuk Kim and Sang H. Son Real­time database systems (RTDBS) have transactions with explicit timing con­ straints in real­time rather than just with best­effort . Many computer systems are now used to monitor and control

Son, Sang H.

244

Towards platform independent models of real time operating systems  

Microsoft Academic Search

With the ever increasing complexity of embedded control systems, it is desirable to employ here real time operating system kernels to fulfill the requirements of stringent timing and resource constraints, and to customise the features of real time operating systems for different applications. To meet these requirements and support portability and re-usability, a platform independent model of real time operating

Shourong Lu; W. A. Halang; R. Gumzej

2004-01-01

245

Real-Time Task Scheduling under Thermal Constraints  

E-print Network

-real-time periodic tasks and non-real-time, but latency-sensitive, aperiodic jobs. We first introduce the Transient Overclocking Server, which safely reduces the response time of aperiodic jobs in the presence of hard real-time periodic tasks and thermal constraints...

Ahn, Youngwoo

2010-10-12

246

A Real-Time Polymerase Chain Reaction Method for Monitoring  

E-print Network

, University of Iowa, Iowa City, Iowa 52242 We have developed a real-time polymerase chain reaction (PCR for the R-subunit of benzylsuccinate synthase. The primer-probe set for real-time PCR was based on consensus confirmed the real-time PCR method's specificityforbssA.Useofacompanionreal-timePCRmethod for estimating

Alvarez, Pedro J.

247

Real time scheduling theory and its use with Ada  

E-print Network

for : Functions must be predictable : the same data input will produce the same data output. Timing behavior mustReal time scheduling theory and its use with Ada Frank Singhoff University of Brest, France LISYC scheduling theory Introducing real time scheduling theory. Usual real time schedulers. Few words about shared

Paris-Sud XI, Université de

248

A Time-Triggered Ethernet Protocol for Real-Time CORBA  

Microsoft Academic Search

The Real-Time CORBA and minimumCORBA specifica- tions are important steps towards defining standard-based middleware which can satisfy real-time requirements in an embedded system. These real-time middlewares must be based on a real-time operating system (RTOS) and a real-time network. This article presents a new time- triggered ethernet protocol that has been implemented under RTLinux. Furthermore it describes a Real-Time CORBA

Stefan Lankes; Andreas Jabs; Michael Reke

2002-01-01

249

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

250

Confinement: a real-time visualization  

E-print Network

Due to the mechanism of confinement, as known from quantum chromodynamics, it is difficult to observe individual particles carrying fractional quantum number (e.g. quark with fractional electric charge). A condensed matter example of fractionalized particles is spinons in quasi-one-dimensional spin systems, which are domain walls in the background of Neel configurations carrying spin-1/2. Using the time-evolving block decimation algorithm, we visualize the nontrivial domain wall dynamics induced by the confine mechanism in a two-leg spin-1/2 ladder. It can be illustrated by a simple single-particle picture of Bloch oscillation, not only qualitatively but also quantitatively. We propose the experimental realization and the real time detection of the domain wall dynamics in the ultra-cold boson systems of $^{87}$Rb.

Zi Cai; Congjun Wu; U. Schollwöck

2012-02-09

251

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

252

Real Time Monitor of Grid job executions  

NASA Astrophysics Data System (ADS)

In this paper we describe the architecture and operation of the Real Time Monitor (RTM), developed by the Grid team in the HEP group at Imperial College London. This is arguably the most popular dissemination tool within the EGEE [1] Grid. Having been used, on many occasions including GridFest and LHC inauguration events held at CERN in October 2008. The RTM gathers information from EGEE sites hosting Logging and Bookkeeping (LB) services. Information is cached locally at a dedicated server at Imperial College London and made available for clients to use in near real time. The system consists of three main components: the RTM server, enquirer and an apache Web Server which is queried by clients. The RTM server queries the LB servers at fixed time intervals, collecting job related information and storing this in a local database. Job related data includes not only job state (i.e. Scheduled, Waiting, Running or Done) along with timing information but also other attributes such as Virtual Organization and Computing Element (CE) queue - if known. The job data stored in the RTM database is read by the enquirer every minute and converted to an XML format which is stored on a Web Server. This decouples the RTM server database from the client removing the bottleneck problem caused by many clients simultaneously accessing the database. This information can be visualized through either a 2D or 3D Java based client with live job data either being overlaid on to a 2 dimensional map of the world or rendered in 3 dimensions over a globe map using OpenGL.

Colling, D. J.; Martyniak, J.; McGough, A. S.; K?enek, A.; Sitera, J.; Mula?, M.; Dvo?ák, F.

2010-04-01

253

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

254

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

255

76 FR 42536 - Real-Time System Management Information Program  

Federal Register 2010, 2011, 2012, 2013

...discussed specific aspects of system design or information dissemination related to the Real-Time System Management Information...its own benefit-cost analysis methods for any real-time information system implementations....

2011-07-19

256

Extending the Sonic Flashlight to Real Time Tomographic Holography  

E-print Network

Extending the Sonic Flashlight to Real Time Tomographic Holography Andreas Nowatzyk 1,2 , Damion with a Holographic Optical Element (HOE). The new technique, called Real Time Tomographic Holography (RTTH), has

Stetten, George

257

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

258

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

259

A real-time prediction of UTC  

NASA Astrophysics Data System (ADS)

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.

1994-05-01

260

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

261

Reconfigurable real-time design with port-based actor  

Microsoft Academic Search

This paper proposes a reconfigurable real-time application design method with port-based Actor to make real-time software design reusable and flexible. Actor is composed by basic components in real-time system. Port-based Actor model is presented. Properties, status and work rules of four kind of ports used to build Actor are discussed as focus. A real-time data acquisition and display application is

Bin Wang; Yunsheng Zhang; Fenghong Xiang; Jing Zhang

2010-01-01

262

Scheduling Issues Arising from Automated Real-Time System Design  

Microsoft Academic Search

We have developed CIRCA, the Cooperative Intelligent Real-time Control Architecture, as amechanism for automating the on-line, adaptive design of real-time systems. The real-time controltasks generated by CIRCA do not meet many of the simplifying assumptions made to developtraditional scheduling algorithms. We examine several problematic issues that arise in schedulingthese automatically-generated real-time monitoring tasks, and describe two solution approaches.In the first

David J. Musliner

1995-01-01

263

Feedback Thermal Control for Real-time Systems  

Microsoft Academic Search

Thermal control is crucial to real-time systems as excessive processor temperature can cause system failure or unacceptable performance degradation due to hardware throt- tling. Real-time systems face significant challenges in thermal management as they must avoid processor overheating while still delivering desired real-time performance. Furthermore, many real-time systems must handle a broad range of uncertainties in system and environmental conditions.

Yong Fu; Nicholas Kottenstette; Yingming Chen; Chenyang Lu; Xenofon D. Koutsoukos; Hongan Wang

2010-01-01

264

Development of educational material for real-time operating system  

Microsoft Academic Search

The importance of understanding real-time OS is getting higher and higher from academic field to industrial field. And it is difficult not only to understand the concept of real-time OS but also implement applications working on it. We develop an educational material to study real-time OS. Our educational material can cover both, the concept of real-time OS and implementation of

Akiko Yoshizaki; Naohiko Shimizu

2012-01-01

265

A Survey of Real-Time Operating Systems -- Draft  

Microsoft Academic Search

This paper describes current research in real time operating systems. Due to its importanceto real-time systems, we begin this survey with a brief summary of relevant results in realtimescheduling and synchronization. Real-time operating systems are described in termsof the primitives and constructs offered to application programs. In addition, the effects ofunderlying computer architectures on real-time operating systems are discussed, followedby

Bodhisattwa Mukherjee; Karsten Schwan; Kaushik Ghosh

1993-01-01

266

Hard and Soft Real Time Based on Switched Ethernet  

Microsoft Academic Search

As we know the Ethernet is based on IEEE 802.3 that can support high-speed in LANs. Unfortunately, this protocol has not supported real-time traffic yet. Therefore, several researches of supporting the real-time traffics on Ethernet are proposed. These approaches either implemented or proposed the real-time guarantees based on switch. Some of these approaches also supported both hard real-time and soft

Vu Van Tan; Dae-Seung Yoo; Myung-Kuyn Kim; Myeong-Jae Yi

2006-01-01

267

High-level real-time programming in Java  

Microsoft Academic Search

Real-time systems have reached a level of complexity beyond the scaling capability of the low-level or restricted languages traditionally used for real-time programming.While Metronome garbage collection has made it practical to use Java to implement real-time systems, many challenges remain for the construction of complex real-time systems, some specific to the use of Java and others simply due to the

David F. Bacon; Perry Cheng; David Grove; Michael Hind; V. T. Rajan; Eran Yahav; Matthias Hauswirth; Christoph M. Kirsch; Daniel Spoonhower; Martin T. Vechev

2005-01-01

268

Integrated scenario in JET using real-time profile control  

Microsoft Academic Search

The recent development of real-time measurements and control tools in JET has enhanced the reliability and reproducibility of the relevant ITER scenarios. Diagnostics such as charge exchange, interfero-polarimetry, electron cyclotron emission have been upgraded for real-time measurements. In addition, real-time processes like magnetic equilibrium and q profile reconstruction have been developed and applied successfully in real-time q profile control experiments

E. Joffrin; F. Crisanti; R. Felton; X. Litaudon; D. Mazon; D. Moreau; L. Zabeo; R. Albanese; M. Ariola; D. Alves; O. Barana; V. Basiuk; A. Bécoulet; M. Bécoulet; J. Blum; T. Bolzonnella; K. Bosak; J. M. Chareau; M. de Baar; E. de la Luna; P. de Vries; P. Dumortier; D. Elbeze; J. Farthing; H. Fernandes; C. Fenzi; R. Giannella; K. Guenther; J. Harling; N. Hawkes; T. C. Hender; D. F. Howell; P. Heesterman; F. Imbeaux; P. Innocente; L. Laborde; G. Lloyd; P. J. Lomas; D. C. McDonald; J. Mailloux; M. Mantsinen; A. Messiaen; A. Murari; J. Ongena; F. Orsitto; V. Pericoli-Ridolfini; M. Riva; J. Sanchez; F. Sartori; O. Sauter; A. C. C. Sips; T. Tala; A. Tuccillo; D. Van Ester; K.-D. Zastrow; M. Zerbini; JET EFDA Programme

2003-01-01

269

Real-time ultrasonic weld evaluation system  

NASA Astrophysics Data System (ADS)

Ultrasonic testing techniques are currently used as an alternative to radiography for detecting, classifying,and sizing weld defects, and for evaluating weld quality. Typically, ultrasonic weld inspections are performed manually, which require significant operator expertise and time. Thus, in recent years, the emphasis is to develop automated methods to aid or replace operators in critical weld inspections where inspection time, reliability, and operator safety are major issues. During this period, significant advances wee made in the areas of weld defect classification and sizing. Very few of these methods, however have found their way into the market, largely due to the lack of an integrated approach enabling real-time implementation. Also, not much research effort was directed in improving weld acceptance criteria. This paper presents an integrated system utilizing state-of-the-art techniques for a complete automation of the weld inspection procedure. The modules discussed include transducer tracking, classification, sizing, and weld acceptance criteria. Transducer tracking was studied by experimentally evaluating sonic and optical position tracking techniques. Details for this evaluation are presented. Classification is obtained using a multi-layer perceptron. Results from different feature extraction schemes, including a new method based on a combination of time and frequency-domain signal representations are given. Algorithms developed to automate defect registration and sizing are discussed. A fuzzy-logic acceptance criteria for weld acceptance is presented describing how this scheme provides improved robustness compared to the traditional flow-diagram standards.

Katragadda, Gopichand; Nair, Satish; Liu, Harry; Brown, Lawrence M.

1996-11-01

270

Groupware for Real-Time Drawing: A Designer's Guide  

E-print Network

Groupware for Real-Time Drawing: A Designer's Guide Saul Greenberg Stephen Hayne Roy Rada Cite as: Greenberg, S., Hayne, S., and Rada, R., eds (1995). Groupware for Real-Time Drawing: A Designer's Guide. 248 in real-time through groupware. People can now share not only their voice and video image, but their work

Greenberg, Saul

271

REAL-TIME SYSTEM DESIGN UNDER PHYSICAL AND RESOURCE CONSTRAINTS  

E-print Network

REAL-TIME SYSTEM DESIGN UNDER PHYSICAL AND RESOURCE CONSTRAINTS A Dissertation Submitted;REAL-TIME SYSTEM DESIGN UNDER PHYSICAL AND RESOURCE CONSTRAINTS Abstract by Thidapat Chantem This dissertation presents several design techniques for resource-constrained, dependable embedded real-time systems

Lemmon, Michael

272

1 Automatic Code Generation for Real-Time Convex Optimization  

E-print Network

.3.4 Sliding window estimation 19 1.3.5 Real-time input design 20 1.3.6 Model predictive control 20 11 Automatic Code Generation for Real-Time Convex Optimization Jacob Mattingley and Stephen Boyd Press, 2009. This chapter concerns the use of convex optimization in real-time embedded systems

273

Integrating job parallelism in real-time scheduling theory  

E-print Network

various contending processes, the concept of scheduling is integral to real-time system design few years. As a consequence, real-time systems -- computer systems where the correctness of each-researched topic. However, requests in real-time environments are often of a recurring nature. Such systems

Paris-Sud XI, Université de

274

Real-Time and Embedded Systems JOHN A. STANKOVIC  

E-print Network

flexible and dy- namic capabilities to real-time systems. Operating systems research has pro- ducedReal-Time and Embedded Systems JOHN A. STANKOVIC University of Massachusetts, Amherst stankovic@cs.umass.edu Real-time systems are those systems in which the correctness of the system de- pends not only

Narasimhan, Priya

275

Task Synchronization in Reservation-Based Real-Time Systems  

E-print Network

Task Synchronization in Reservation-Based Real-Time Systems Giuseppe Lipari, Member, IEEE, GerardoWidth Inheritance (BWI) protocol, a new strategy for scheduling real-time tasks in dynamic systems, which extends guarantees becomes a complex problem. In dynamic real-time systems, tasks can be activated dynamically

Lipari, Giuseppe

276

A new checkpoint mechanism for real time operating systems  

Microsoft Academic Search

This paper presents an overview of a proposed protocol to provide application---transparent fault tolerant services in a Real Time Operating system. Fault tolerance is achieved by saving checkpoints of the processes belonging to a real time application. This approach proposes the extension of some real time system calls in order to save a recovery point when the user invokes them.

Santiago Rodríquez; Antonio Pérez; Rafael Méndez

1997-01-01

277

Challenges for future real-time operating systems  

Microsoft Academic Search

Most of todayfs real-time operating systems are stripped down optimized versions of existing timesharing operating systems. They were not designed to meet the requirements of real-time systems. This paper discusses the type of real-time operating systems that will be needed in the future and some of the strategies that they may utilize.

Tom Hand

1991-01-01

278

Real-Time Traffic Information for Emergency Evacuation Operations  

E-print Network

Real-Time Traffic Information for Emergency Evacuation Operations Research Brief Oak Ridge National, the availability of real- time traffic information plays a critical role in the management of the evacuation are identified, re- routing strategies must be determined in real-time and deployed in the field to help

279

Mining, Modeling, and Analyzing Real-Time Social Trails  

E-print Network

-time social trails that reflect the digital footprints of crowds of real-time web users in response to real-world events or online phenomena. These digital footprints correspond to the artifacts strewn across the real-time web like posting of messages...

Kamath, Krishna Y

2013-05-28

280

Adaptive Fault Tolerance in Real Time Cloud Computing Sheheryar Malik  

E-print Network

Adaptive Fault Tolerance in Real Time Cloud Computing Sheheryar Malik Research Team OASIS INRIA.huet@inria.fr Abstract -- With the increasing demand and benefits of cloud computing infrastructure, real time computing can be performed on cloud infrastructure. A real time system can take advantage of intensive computing

Paris-Sud XI, Université de

281

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

282

Real time 3D holographic display  

NASA Astrophysics Data System (ADS)

In this article is described a Real Time 3D video display of holographic images based on the principle of sequential scanning of holograms with HPO (horizontal parallax only) generated by a high speed computer and sent at high frame rate to DMD, and visualized by an anamorphic optical group. The device displays binary amplitude and phase modulated images opportunely synchronized and scanned by a galvanometric mirror or polygonal mirror driven by the control electronic circuitry. The elementary holograms are generated by a resident hardware which, through interpolation, generates single elementary holograms starting from images and depth map. The device operates with incoherent light (integral images) or with coherent light (holographic display) by changing the optical visualization group.

Loreti, Luigi; Ceccarelli, R.; Loreti, A.; Borro, A.

2012-03-01

283

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

284

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

285

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

286

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

287

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

288

Real Time Seismic Prediction while Drilling  

NASA Astrophysics Data System (ADS)

Efficient and safe drilling is a prerequisite to enhance the mobility of people and goods, to improve the traffic as well as utility infrastructure of growing megacities, and to ensure the growing energy demand while building geothermal and in hydroelectric power plants. Construction within the underground is often building within the unknown. An enhanced risk potential for people and the underground building may arise if drilling enters fracture zones, karsts, brittle rocks, mixed solid and soft rocks, caves, or anthropogenic obstacles. Knowing about the material behavior ahead of the drilling allows reducing the risk during drilling and construction operation. In drilling operations direct observations from boreholes can be complemented with geophysical investigations. In this presentation we focus on “real time” seismic prediction while drilling which is seen as a prerequisite while using geophysical methods in modern drilling operations. In solid rocks P- and S-wave velocity, refraction and reflection as well as seismic wave attenuation can be used for the interpretation of structures ahead of the drilling. An Integrated Seismic Imaging System (ISIS) for exploration ahead of a construction is used, where a pneumatic hammer or a magnetostrictive vibration source generate repetitive signals behind the tunneling machine. Tube waves are generated which travel along the tunnel to the working face. There the tube waves are converted to mainly S- but also P-Waves which interact with the formation ahead of the heading face. The reflected or refracted waves travel back to the working front are converted back to tube waves and recorded using three-component geophones which are fit into the tips of anchor rods. In near real time, the ISIS software allows for an integrated 3D imaging and interpretation of the observed data, geological and geotechnical parameters. Fracture zones, heterogeneities, and variations in the rock properties can be revealed during the drilling operation. First experiments indicate that parts of the ISIS system can be used for smaller diameters e.g. in vertical drilling. In unconsolidated rocks S-waves are strongly attenuated. For the Sonic Softground Probing (SSP) system P-waves are used. A vibration-seismic correlation positioning system was developed. One transmitter and several receiver are placed within the cutting wheel. During drilling, a specially coded transmitter signal is sent directly from the cutterhead via the face support medium in the direction of tunneling. With this geometry, boulders can be detected 50 m ahead of the working face. Fracture zones and other discontinuities can be localized, and the physical properties of the upcoming rocks can be partly determined nearly in real time, while using sound velocity and attenuation as indicators. All evaluation is based on real time 3D velocity models which are determined during the drilling operation. Different technologies allow a seismic prediction while drilling in various rock types and geologies. Seismic prediction during vertical drilling will significantly profit from the lesson learned from state of the art tunneling systems.

Schilling, F. R.; Bohlen, T.; Edelmann, T.; Kassel, A.; Heim, A.; Gehring, M.; Lüth, S.; Giese, R.; Jaksch, K.; Rechlin, A.; Kopf, M.; Stahlmann, J.; Gattermann, J.; Bruns, B.

2009-12-01

289

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

290

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

291

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

292

RTNCAT (Real Time NCAT): Implementing Real Time physiological movement of voxellized phantoms in GATE  

Microsoft Academic Search

GATE figures among existing MC simulation codes for emission tomography applications. Although it allows working with voxellized activity distributions it does not enable the incorporation of physiological motion in a real time sense for such distributions. This restriction causes substantial drawbacks where dynamic phenomena such as respiratory or radiotracer motion are of interest. A new C++ class, named \\

P. Descourt; W. P. Segars; F. Lamare; L. Ferrer; B. Tsui; Y. Bizais; M. Bardies; D. Visvikis

2006-01-01

293

Real-time evaluation techniques for real-time image processing hardware  

Microsoft Academic Search

Real-time hardware developed for image processing applications such as image enhancement, segmentation, image registration, pattern recognition, etc. can not be thoroughly debugged and analyzed for its performance by using conventional test equipment. To cite an example, the hardware for image registration may be failing intermittently or the registration point may be drifting even when the scene and the sensor are

Ronda Venkateswarlu; C. Arjuna Rao

1992-01-01

294

A real-time monitor for a distributed real-time operating system  

Microsoft Academic Search

Monitoring and debugging for a distributed real-time system is a complicated problem due to the lack of a set of advanced tools and adequate operating system capability. Software tools can cover the wide range of the software development life cycle from the requirement analysis phase to debugging and maintenance phases. However, many of these modern tools are not effective for

Hideyuki Tokuda; Makoto Kotera; Clifford E. Mercer

1989-01-01

295

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

296

Real-time scheduling of software tasks  

SciTech Connect

When designing real-time systems, it is often desirable to schedule execution of software tasks based on the occurrence of events. The events may be clock ticks, interrupts from a hardware device, or software signals from other software tasks. If the nature of the events, is well understood, this scheduling is normally a static part of the system design. If the nature of the events is not completely understood, or is expected to change over time, it may be necessary to provide a mechanism for adjusting the scheduling of the software tasks. RHIC front-end computers (FECs) provide such a mechanism. The goals in designing this mechanism were to be as independent as possible of the underlying operating system, to allow for future expansion of the mechanism to handle new types of events, and to allow easy configuration. Some considerations which steered the design were programming paradigm (object oriented vs. procedural), programming language, and whether events are merely interesting moments in time, or whether they intrinsically have data associated with them. The design also needed to address performance and robustness tradeoffs involving shared task contexts, task priorities, and use of interrupt service routine (ISR) contexts vs. task contexts. This paper will explore these considerations and tradeoffs.

Hoff, L.T.

1995-12-01

297

The multispectral advanced volumetric real-time imaging compositor for real-time distributed scene generation  

NASA Astrophysics Data System (ADS)

AMRDEC has developed the Multi-spectral Advanced Volumetric Real-time Imaging Compositor (MAVRIC) prototype for distributed real-time hardware-in-the-loop (HWIL) scene generation. MAVRIC is a dynamic object-based energy conserved scene compositor that can seamlessly convolve distributed scene elements into temporally aligned physicsbased scenes for enhancing existing AMRDEC scene generation codes. The volumetric compositing process accepts input independent of depth order. This real-time compositor framework is built around AMRDEC's ContinuumCore API which provides the common messaging interface leveraging the Neutral Messaging Language (NML) for local, shared memory, reflective memory, network, and remote direct memory access (RDMA) communications and the Joint Signature Image Generator (JSIG) that provides energy conserved scene component interface at each render node. This structure allows for a highly scalable real-time environment capable of rendering individual objects at high fidelity while being considerate of real-time hardware-in-the-loop concerns, such as latency. As such, this system can be scaled to handle highly complex detailed scenes such as urban environments. This architecture provides the basis for common scene generation as it provides disparate scene elements to be calculated by various phenomenology codes and integrated seamlessly into a unified composited environment. This advanced capability is the gateway to higher fidelity scene generation such as ray-tracing. The high speed interconnects using PCI Express and InfiniBand were examined to support distributed scene generation whereby the scene graph, associated phenomenology, and the scene elements can be dynamically distributed across multiple high performance computing assets to maximize system performance.

Morris, Joseph W.; Ballard, Gary H.; Bunfield, Dennis H.; Peddycoart, Thomas E.; Trimble, Darian E.

2011-06-01

298

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

299

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

300

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

301

Cryogenic Faraday isolator  

SciTech Connect

A Faraday isolator is described in which thermal effects are suppressed by cooling down to liquid nitrogen temperatures. The principal scheme, main characteristics and modifications of the isolator are presented. The isolation degree is studied experimentally for the subkilowatt average laser radiation power. It is shown that the isolator can be used at radiation powers up to tens of kilowatts. (quantum electronic devices)

Zheleznov, D S; Zelenogorskii, V V; Katin, E V; Mukhin, I B; Palashov, O V; Khazanov, Efim A [Institute of Applied Physics, Russian Academy of Sciences, Nizhnii Novgorod (Russian Federation)

2010-05-26

302

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

303

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 Sonar Echo Processor - IROS'2000 Contents u Introduction u Processing u Results u Conclusions #12;Monash University AUSTRALIA 3A Real Time DSP Sonar Echo Processor - IROS'2000 Introduction u Robot systems are often

304

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

305

Real-time information management environment (RIME)  

NASA Astrophysics Data System (ADS)

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- generation information management, contrasts the approach against emerging technologies, and quantifies the performance gains. This architecture and implementation, known as Real-time Information Management Environment (RIME), is based on two key concepts: information utility and content-based channelization. The introduction of utility allows users to express the importance and delivery requirements of their information needs in the context of their mission. Rather than competing for resources on a first-come/first-served basis, the infrastructure employs these utility functions to dynamically react to unanticipated loading by optimizing the delivered information utility. Furthermore, commander's resource policies shape these functions to ensure that resources are allocated according to military doctrine. Using information about the desired content, channelization identifies opportunities to aggregate users onto shared channels reducing redundant transmissions. Hence, channelization increases the information throughput of the system and balances sender/receiver processing load.

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

2000-08-01

306

Real time calculation for holographic video display  

NASA Astrophysics Data System (ADS)

For practical holographic video system, it is important to generated holographic fringe as fast as possible. We have proposed an approximation method that can calculate the hologram faster. However, for the full parallax Fresnel hologram, the speed is not enough for real-time calculation. In this paper, we change the type of hologram from Fresnel to image. Since the object points of the image hologram are located very close to the hologram, calculations for single object point require only fractional part of the hologram. This also makes computation quite fast. The image hologram with 1.47 million pixels hologram, the speed of ten frames per second is obtained with the object consists of 7,000 points. Experimental results demonstrate that the interactive computation of complex object can be generated with conventional PC. We also investigated rainbow hologram for both full-color reconstruction and fast calculation. Reconstructed image prove that the color registration is good thorough the view zone. From the experimental results, compared with the image hologram, we could achieve about two times calculation speed when the number of the object point is more than 17,000. This results demonstrate that the interactive computation of full-color object can be generated with conventional PC.

Yamaguchi, Takeshi; Yoshikawa, Hiroshi

2006-02-01

307

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.

308

Faithful Virtualization on a Real-Time Operating System  

Microsoft Academic Search

The combination of a real-time executive and off-the-shelf time-sharing operating systems has the potential of providing both predictability and the comfort of a large application base. Isolation between the components is required to protect the real-time subsystem from a significant class of faults in the (ever-growing) time-sharing operating systems but also to protect real-time applications from each other. Recent commodity

Henning Schild; Adam Lackorzynski; Alexander Warg

309

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

310

Real-Time Operating Systems: Issues and Implementations  

Microsoft Academic Search

This paper shall oer an insight into the issues, priorities and con- siderations taken into account in real-time operating systems and con- straints. It shall also visit some of the solutions and methods as imple- mented in various real-world and research-based real-time operating systems.

Ryan Puga Nakamoto

311

On the Difficulty of Building a Precise Timing Model for Real-Time Programming  

E-print Network

of this hardware exploration is that real-time computing needs co-design of compilation, timing analysisOn the Difficulty of Building a Precise Timing Model for Real-Time Programming Albrecht Kadlec,raimund}@vmars.tuwien.ac.at Abstract. For real-time computing it is important to know the worst- case execution time (WCET) of all time

312

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

313

Real-Time 3D Visualization  

NASA Technical Reports Server (NTRS)

Butler Hine, former director of the Intelligent Mechanism Group (IMG) at Ames Research Center, and five others partnered to start Fourth Planet, Inc., a visualization company that specializes in the intuitive visual representation of dynamic, real-time data over the Internet and Intranet. Over a five-year period, the then NASA researchers performed ten robotic field missions in harsh climes to mimic the end- to-end operations of automated vehicles trekking across another world under control from Earth. The core software technology for these missions was the Virtual Environment Vehicle Interface (VEVI). Fourth Planet has released VEVI4, the fourth generation of the VEVI software, and NetVision. VEVI4 is a cutting-edge computer graphics simulation and remote control applications tool. The NetVision package allows large companies to view and analyze in virtual 3D space such things as the health or performance of their computer network or locate a trouble spot on an electric power grid. Other products are forthcoming. Fourth Planet is currently part of the NASA/Ames Technology Commercialization Center, a business incubator for start-up companies.

1997-01-01

314

Real-time Forecast of Multiphase Outbreak  

PubMed Central

We used a single equation with discrete phases to fit the daily cumulative case data from the 2003 severe acute respiratory syndrome outbreak in Toronto. This model enabled us to estimate turning points and case numbers during the 2 phases of this outbreak. The 3 estimated turning points are March 25, April 27, and May 24. The estimated case number during the first phase of the outbreak between February 23 and April 26 is 140.53 (95% confidence interval [CI] 115.88–165.17) if we use the data from February 23 to April 4; and 249 (95% CI: 246.67–251.25) at the end of the second phase on June 12 if we use the data from April 28 to June 4. The second phase can be detected by using case data just 3 days past the beginning of the phase, while the first and third turning points can be identified only ?10 days afterwards. Our modeling procedure provides insights into ongoing outbreaks that may facilitate real-time public health responses. PMID:16494728

Cheng, Yuan-Sen

2006-01-01

315

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

316

Real-time sensing of optical alignment  

NASA Technical Reports Server (NTRS)

The Large Deployable Reflector and other future segmented optical systems may require autonomous, real-time alignment of their optical surfaces. Researchers have developed gratings located directly on a mirror surface to provide interferometric sensing of the location and figure of the mirror. The grating diffracts a small portion of the incident beam to a diffractive focus where the designed diagnostics can be performed. Mirrors with diffraction gratings were fabricated in two separate ways. The formation of a holographic grating over the entire surface of a mirror, thereby forming a Zone Plate Mirror (ZPM) is described. Researchers have also used computer-generated hologram (CGH) patches for alignment and figure sensing of mirrors. When appropriately illuminated, a grid of patches spread over a mirror segment will yield a grid of point images at a wavefront sensor, with the relative location of the points providing information on the figure and location of the mirror. A particular advantage of using the CGH approach is that the holographic patches can be computed, fabricated, and replicated on a mirror segment in a mass production 1-g clean room environment.

Stier, Mark T.; Wissinger, Alan B.

1988-01-01

317

Comparing the Real-Time Performance of Windows NT to an NT Real-Time Extension  

Microsoft Academic Search

Because of the dominance of Microsoft(R) Windows(R) in the PC market there is a strong interest in using Windows NT(R) as a platform for real-time process and control systems. This type of solution is very cost effective because applications and development tools are widely available. However, Windows NT was designed as a general purpose operating system and optimizes average not

Kevin M. Obenland; John Kowalik; Tiffany Frazier; Jin S. Kim

1999-01-01

318

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

319

Real-Time Decision Making for Large POMDPs  

Microsoft Academic Search

In this paper, we introduce an approach called RTBSS (Real- Time Belief Space Search) for real-time decision making in large POMDPs. The approach is based on a look-ahead search that is applied online each time the agent has to make a decision. RTBSS is particularly interesting for large real-time environments where offline solutions are not applicabl e because of their

Sébastien Paquet; Ludovic Tobin; Brahim Chaib-draa

2005-01-01

320

Reliable Downlink Scheduling for Wireless Networks with Real-Time and Non-Real Time Clients  

E-print Network

IP traffic generated by a Cisco IP Phone system generates packets at inter-arrival times of 8 to 15 milliseconds [46]. It is practical to measure the throughput of Skype Client in a service period of multiple of 16 milliseconds, while measure the throughput... of VoIP traffic generated by a Cisco IP Phone system in a service period of 12 milliseconds. Real time applications require high reliabilities in the throughput received. They expect a constant threshold of service to be received from the BS. For example...

Jain, Abhishek

2014-08-05

321

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.

322

Real-time Power System Simulator using PC Cluster  

NASA Astrophysics Data System (ADS)

This paper presents details on the development of a fully digital real-time power system simulator “Hypersim" on a new hardware architecture called PC cluster. PC cluster is a parallel-processing system composed by commodity hardware. Therefore hardware cost of the developed simulator can be reduced compared with simulators implemented on supercomputers. The authors prototyped a real-time simulator “Hypersim" on a 4 CPU cluster. For a small and large size of benchmark power system network, 4 CPU cluster can simulate the network in real-time with 21 and 78 microseconds time step, respectively. This simulator makes us enable to test several equipments in real-time.

Yamamoto, Takaya; Enomoto, Hiroshi; Kuroda, Kenichi; Kono, Yoshiyuki; Taoka, Hisao

323

Faraday's Electromagnetic Lab  

NSDL National Science Digital Library

Play with a bar magnet and coils to learn about Faraday's law. Move a bar magnet near one or two coils to make a light bulb glow. View the magnetic field lines. A meter shows the direction and magnitude of the current. View the magnetic field lines or use a meter to show the direction and magnitude of the current. You can also play with electromagnets, generators and transformers!

Simulations, Phet I.; Dubson, Michael; Malley, Chris; Perkins, Kathy; Wieman, Carl; Harlow, Danielle

2005-04-01

324

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

325

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

326

Faraday Disk Dynamo Model  

NSDL National Science Digital Library

The EJS Faraday Disk Dynamo shows a conducting disk that rotates in a magnetic field. This produces a current (homopolar generator) and for certain configurations, it is a self-exciting dynamo. A self-exciting dynamo is the mechanical analog of a proposed mechanism to produce the earth and sun's magnetic fields. You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting âOpen Ejs Modelâ from the pop-up menu item. The Faraday Disk Dynamo model was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_em_FaradayDiskDynamo.jar file will run the program if Java is installed. Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional Ejs models are available. They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs.

Cox, Anne

2009-09-28

327

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

328

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

329

Using CORBA Asynchronous Messaging, Pluggable Protocols and the Real-Time Event Service in a Real-Time Embedded System  

Microsoft Academic Search

This paper will share our experiences using commer- cial-off-the-shelf CORBA(1) middleware in an actual embedded real-time system to both serve the real-time needs of our problem domain and to drastically reduce the time and money spent to develop world class com- mercial real-time embedded software. Furthermore, this paper will outline how a CORBA-compliant ORB can be easily and seamlessly extended

Bruce Trask

330

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

331

Real-time system design: a temporal perspective  

Microsoft Academic Search

The design of a real-time system must not only incorporate means of tackling functional complexity, but also means to analyze and predict real-time temporal properties. Unfortunately, most design methods provide little support to a designer towards meeting the real-time performance specifications of the system. The design of a system involves many parameters which are artifacts of the system design, and

Manas Saksena

1998-01-01

332

Reusing Real-Time Systems Design Experience Through Modelling Patterns  

Microsoft Academic Search

To ensure correctness and performance of real-time embedded systems, early evaluation of properties is needed. Based on design experience for real-time sys- tems and using the concepts of the POOSL language, we introduce modelling patterns that allow easy com- position of models for design space exploration. These patterns cover difierent types of real-time tasks, re- sources and mappings, and include

Oana Florescu; Jeroen Voeten; Marcel Verhoef; Henk Corporaal

2006-01-01

333

An Extended Model for Real-Time Systems  

Microsoft Academic Search

Many systems are or include real-time systems, the range spans from embedded systems up to large, complex sys- tems like nodes and devices in telecommunication net- works. For the purpose of modeling and designing such systems, a more thorough understanding of the generic structure of real-time systems is required. Unfortunately, there is no standardized definition of real-time systems in the

Dominikus Herzberg; Andre Marburger

2000-01-01

334

HARTOS: a distributed real-time operating system  

Microsoft Academic Search

This paper outlines the design objectives and research goals for HARTOS, a distributed real-time operating system being developed at The University of Michigan. This effort is part of a larger research project to design and implement an experimental distributed real-time system called the Hexagonal Architecture for Real-Time Systems (HARTS). An important feature of HARTS is the use of an intelligent

Dilip D. Kandlur; Daniel L. Kiskis; Kang G. Shin

1989-01-01

335

Adaptability, Extensibility, and Flexibility in Real-Time Operating Systems  

Microsoft Academic Search

In this paper, we present a mechanism for runtime updating of all kernel modules of a highly modular dynamic real-time operating system. Our approach can help solve the lack of adaptability, extensibility, and flexibility of existing real-time operating systems. The dynamic real-time operating system will efficiently support a wide range of applications since any kernel module can be dynamically loaded

Pramote Kuacharoen; Tankut Akgul; Vincent John Mooney; Vijay K. Madisetti

2001-01-01

336

Real-time operating system for advanced avionics architecture  

Microsoft Academic Search

A real-time operating system, the Ada Avionics Real-Time Software (AARTS) Operating System (AOS), is discussed, which under development for the US Air Force. The AOS is intended to mitigate problems with Ada executing in real time on 16-bit data processors in a distributed architecture configuration. The AOS consists of a three part executive: system executive, kernel executive, and distributive executive.

S. L. Benning; R. S. Evans

1988-01-01

337

Towards a Real-Time Cluster Computing Infrastructure  

Microsoft Academic Search

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

Peter SY Hui; Satish Chikkagoudar; Mark R. Johnston

2011-01-01

338

Real-time Narrative Summaries for NOAA’s PORTS®  

Microsoft Academic Search

NOAA's PORTS® (Physical Oceanographic Real-Time System) currently provides historical and real-time observations and predictions of water levels, coastal currents and other meteorological and oceanographic data for a dozen US estuaries. PORTS (http:\\/\\/co-ops.nos.noaa.gov\\/d_ports.html) displays its real-time data in graphical and tabular form. These forms can require lengthy inspection to retrieve the relevant details, particularly in a large PORTS locale with many

Jennifer Werner; Michael Evans; Thomas Bethem

2005-01-01

339

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

340

Quantification using real-time PCR technology: applications and limitations  

Microsoft Academic Search

The introduction of real-time PCR technology has significantly improved and simplified the quantification of nucleic acids, and this technology has become an invaluable tool for many scientists working in different disciplines. Especially in the field of molecular diagnostics, real-time PCR-based assays have gained favour in the recent past. However, the wide use of real-time PCR methods has also highlighted some

Dieter Klein

2002-01-01

341

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

342

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

343

Timed Multitasking for Real-Time Embedded Software Software in real-time embedded systems differs fundamentally from its desktop or Internet  

E-print Network

1 of 30 Timed Multitasking for Real-Time Embedded Software Software in real-time embedded systems in typical embedded software design. The functional- ity is determined at design time with assumptions by a real-time operating system (RTOS). Typically, an RTOS offers as control of these timing properties one

344

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

345

Controlling a Neuroprosthetic Arm: Real Time Estimation and Prediction  

E-print Network

Controlling a Neuroprosthetic Arm: Real Time Estimation and Prediction Cari Kaufman and Val to predicting movement can also perform real time estima- tion of the model. This article proposes statistical to design an algorithm which at any given time has as its input the firing rates of a population of neurons

346

An Engineering Approach to Hard Real-Time System Design  

Microsoft Academic Search

This paper presents a systematic methodology for the design of distributed fault tolerant real-time systems. The methodology covers the stepwise refinement of the given requirements, expressed in the form of real-time transactions, to task and protocol executions. It also includes a timing analysis and dependability evaluation of the still incomplete design. The testability of the evolving system is considered to

Hermann Kopetz; R. Zainlinger; Gerhard Fohler; Heinz Kantz; Peter P. Puschner; Werner Schütz

1991-01-01

347

Path Selection for Real-Time Communication in Wormhole Networks  

Microsoft Academic Search

For real-time communication, we must be able to guarantee timely delivery of messages. In a previous paper, Kim et al. presented a real-time communication method for networks which uses a deterministic wormhole routing algorithm. It would be more desirable to be able to use an adaptive wormhole routing algo- rithm. However, the use of an adaptive algorithm results in highly

Kyungwan Nam; Sunggu Lee; Jong Kim

1999-01-01

348

Real-Time UML State Machines: An Analysis Approach  

Microsoft Academic Search

Since real-time systems have special characteristics the development of such systems requires the observation of quantitative system aspects. Quan- titative predictions are needed already during the modeling phase of the system development process. Recently the Unified Modeling Language (UML) includ- ing its Profile for Schedulability, Performance, and Time (SPT) gained increas- ing acceptance as a specification language for modeling real-time

J. Trowitzsch; A. Zimmermann

349

Environmental Simulation of Real-Time Systems with Nested Interrupts  

Microsoft Academic Search

Interrupts are important aspects of real-time embedded systems to handle events in time. When there exist nested in- terrupts in a real-time system, and an urgent interrupt is al- lowed to preempt the current interrupt handling, the design and analysis of the system become difficult due to the lack of appropriate behavioral models. This paper proposes a compositional model for

Guoqiang Li; Shoji Yuen; Masakazu Adachi

2009-01-01

350

A real-time simulation facility for astronomical adaptive optics  

E-print Network

In this paper we introduce the concept of real-time hardware-in-the-loop simulation for astronomical adaptive optics, and present the case for the requirement for such a facility. This real-time simulation, when linked with an adaptive optics real-time control system, provides an essential tool for the validation, verification and integration of the Extremely Large Telescope real-time control systems prior to commissioning at the telescope. We demonstrate that such a facility is crucial for the success of the future extremely large telescopes.

Basden, Alastair

2014-01-01

351

A real-time simulation facility for astronomical adaptive optics  

NASA Astrophysics Data System (ADS)

In this paper we introduce the concept of real-time hardware-in-the-loop simulation for astronomical adaptive optics, and present the case for the requirement for such a facility. This real-time simulation, when linked with an adaptive optics real-time control system, provides an essential tool for the validation, verification and integration of the Extremely Large Telescope real-time control systems prior to commissioning at the telescope. We demonstrate that such a facility is crucial for the success of the future extremely large telescopes.

Basden, Alastair

2014-04-01

352

Real-Time Modeling of Natural Resources Using the Spatial Sciences  

E-print Network

CHAPTER 5 Real-Time Modeling of Natural Resources Using the Spatial Sciences Balaji Narasimhan, Pei _____________________________________________________________________________________________________________________ 51 Real-Time Wildfire Risk Assessment ___________________________________________________________________________________________________ 54 Real-Time Methodology

353

Predicting Time-Delays under Real-Time Scheduling for Linear Model Predictive Control  

E-print Network

prediction of time-delays caused by real-time scheduling. Then, a model predictive controller is designed, the interaction between real-time scheduling and control design has received interest in the literaturePredicting Time-Delays under Real-Time Scheduling for Linear Model Predictive Control Zhenwu Shi

Zhang, Fumin

354

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

355

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

356

Structuring criteria for real time system design  

Microsoft Academic Search

This paper discusses and compares the criteria used. by different design methods for decomposing a .real tune system into tasks and modules. The criterta considered are coupling, cohesion and information hidin for module structurmg and concurrency for tasks.. TE e Structured Design method uses the module cou hng and cohesion criteria. The NRL method and Object 8. rtented Destgn use

Hassan Gomaa

1989-01-01

357

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

358

MAST Real-Time View: A Graphic UML Tool for Modeling Object-Oriented Real-Time System  

Microsoft Academic Search

This paper describes a methodology and a framework for building an analyzable real-time model of an object-oriented system that is developed using a UML CASE tool. The real-time model is formulated by a new UML view named "MAST RT View". This view allows the designer to gradually build the real-time model according to the phase of the development process, to

Julio L. Medina Pasaje; Michael González Harbour; José M. Drake

2001-01-01

359

Real-Time VirtualClock: a new network traffic control mechanism for real-time communications  

Microsoft Academic Search

A new traffic control discipline is needed for real-time communications: it should generate proper packet orderings and schedule packet transmissions to meet both minimum and maximum delay bounds. Real-time flows must be protected from flows of misbehaved users and from network load fluctuations. Current network traffic mechanisms do not provide both protections. The Real-Time VirtualClock (RTVC) algorithm is designed for

Jae-Chang Kwak

1994-01-01

360

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

361

Real-Time Databases Lisa Cingiser DiPippo and Victor Fay Wolfe  

E-print Network

, research, and actual implementations of real-time database management systems. A real-time database is a component of a real-time system. A real-time system is one in which timing constraints, such as start times in real-time systems that in uence real-time database design. We summarize this work in Section 2

Rhode Island, University of

362

A polarization sensitive interferometer for Faraday rotation detection.  

E-print Network

??Time-resolved Faraday rotation (TRFR) is a pulsed laser pump/probe optical measurement used to characterize electron spin dynamics in semiconductor materials. A Mach-Zehnder type interferometer with… (more)

LaForge, Joshua Michael

2007-01-01

363

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

364

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

365

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

366

A real-time photogrammetry system based on embedded architecture  

NASA Astrophysics Data System (ADS)

In order to meet the demand of real-time spatial data processing and improve the online processing capability of photogrammetric system, a kind of real-time photogrammetry method is proposed in this paper. According to the proposed method, system based on embedded architecture is then designed: using FPGA, ARM+DSP and other embedded computing technology to build specialized hardware operating environment, transplanting and optimizing the existing photogrammetric algorithm to the embedded system, and finally real-time photogrammetric data processing is realized. At last, aerial photogrammetric experiment shows that the method can achieve high-speed and stable on-line processing of photogrammetric data. And the experiment also verifies the feasibility of the proposed real-time photogrammetric system based on embedded architecture. It is the first time to realize real-time aerial photogrammetric system, which can improve the online processing efficiency of photogrammetry to a higher level and broaden the application field of photogrammetry.

Zheng, S. Y.; Gui, L.; Wang, X. N.; Ma, D.

2014-06-01

367

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

SciTech Connect

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{sup 16} m{sup ?2} (?2°), and the Faraday rotation angle rms phase noise is <0.1°.

Liu, H. Q.; Jie, Y. X., E-mail: yx-jie@ipp.ac.cn; Zou, Z. Y.; Li, W. M.; Wang, Z. X.; Qian, J. P.; Yang, Y.; Zeng, L.; Wei, X. C.; Hu, L. Q.; Wan, B. N. [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031 (China); Ding, W. X.; Brower, D. L. [Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095 (United States); Lan, T.; Li, G. S. [Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031 (China); University of Science and Technology of China, Hefei, Anhui 230026 (China)

2014-11-15

368

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

369

Real-time filesystems - Guaranteeing timing constraints for disk accesses in RT-Mach  

Microsoft Academic Search

Traditional real-time systems have largely avoided the use of disks due to their relative slow speeds and their un- predictability. However, many real-time applications in- cluding multimedia systems and real-time database ap- plications benefit significantly from the use of disks to store and access real-time data. In this paper, we investigate the problem of obtaining guaranteed timely access to files

Anastasio Molano; Kanaka Juvva; Ragunathan Rajkumar

1997-01-01

370

Towards Composable Timing for Real-Time Software Peter Puschner and Raimund Kirner  

E-print Network

early in the software development process. Yet real-time software design and development practices lagTowards Composable Timing for Real-Time Software Peter Puschner and Raimund Kirner Technische.g.pettit@aero.org Abstract Real-time software is increasing in size and complexity, precipitating the need for advanced

371

A Hardware Time Manager Implementation for the Xenomai Real-Time Kernel of Embedded Linux  

E-print Network

Purpose and Application-based Systems]: Real-time and Embedded Systems; B.6.1 [Logic Design]: Design StyleA Hardware Time Manager Implementation for the Xenomai Real-Time Kernel of Embedded Linux Pierre to its modularity, efficiency, reliability, and cost. One way to make it hard real-time is to include

Paris-Sud XI, Université de

372

A Proportional Share Resource Allocation Algorithm for Real-Time, Time-Shared Systems  

E-print Network

the theoretical bounds and hence supports real-time execution in a general purpose operating system. 1A Proportional Share Resource Allocation Algorithm for Real-Time, Time-Shared Systems Ion Stoica shared vir- tual environments, and collaboration-support systems require real-time computation

North Carolina at Chapel Hill, University of

373

Integrating VDM++ and Real-Time System Design  

Microsoft Academic Search

This paper presents work performed in the EPSRC “Object-oriented Specification of Reactive and Real-time Systems” project. It aims to provide formal design methods for real-time systems, using a combination of the VDM++ formal method and the HRT-HOOD method.

Kevin Lano; S. J. Goldsack; Stuart Kent

1997-01-01

374

Real time control of spindle runout T. G. Bifano  

E-print Network

Real time control of spindle runout T. G. Bifano T. A. Dow North Carolina State University 27695 -7910 CONTENTS 1. Introduction 2. Spindle and control system design 2.1. Control algorithm 2; real -time error correction; precision feedback control. Optical Engineering 24(5), 888 -892 (September

375

Integrated Design Tools for Hard Real-Time Systems  

Microsoft Academic Search

We propose a toolset for designing real-time systems. The toolset is based on a design methodology for real-time systems. The purpose of a design methodology is to pro- vide a set of procedures and guidelines that, with human intervention and interaction, allow designers to systemati- cally obtain implementations of systems that conform pre- cisely to their design specifications. Our methodology

Carlos Puchol; Aloysius K. Mok

1998-01-01

376

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.

377

Measuring the real-time operating system performance  

Microsoft Academic Search

Tests for measuring the real time operating system performance belong to the software technology. They give quantitative measures for the most important characteristics and allow the implementer to compare the efficiency of various operating systems. The paper presents a set of simple tests for measuring the real time operating system characteristics. The tests require no specialized hardware, and are based

Krzysztof M. Sacha

1995-01-01

378

Re) Configurable Real-Time Operating Systems and Their Applications  

Microsoft Academic Search

There are trends in the area of real-time computing to shift from RTOS kernels (fixed or configurable ones) to more flexible approaches, where a RTOS (real-time operating system) is generated exactly in the way it is needed for a specific application context. One example for this approach is the component library Dreams, developed at HNI of Universitat Paderborn. This library

Carsten Böke; Marcelo Götz; Tales Heimfarth; Dania El Kebbe; Franz J. Rammig; Sabina Rips

2003-01-01

379

A Real Time Eye-Motion Monitoring System  

Microsoft Academic Search

A real time image based system is presented that is able to measure eye movement related quantities at high frame rate. The system's hardware component allows for high frame rate image acquisition under near infrared constant lighting conditions, whereas the software component is capable of performing real time image processing to determine the values of the required eye-related parameters. The

K. K. Delibasis; P. Asvestas; G. K. Matsopoulos; T. Economopoulos; N. Assimakis

2009-01-01

380

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

381

The Durham adaptive optics real-time controller  

Microsoft Academic Search

The Durham adaptive optics real-time controller was initially a proof of concept design for a generic adaptive optics control system. It has since been developed into a modern and powerful CPU based real-time control system, capable of using hardware acceleration (including FPGAs and GPUs), based primarily around commercial off the shelf hardware. It is powerful enough to be used as

Alastair Basden; Deli Geng; Richard Myers; Eddy Younger

2010-01-01

382

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...

383

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

384

Experimental demonstration of flexible bandwidth networking with real-time  

E-print Network

-bandwidth network testbed with a real-time, adaptive control plane that adjusts modulation format and spectrum/s flexpath in which the control plane adapts to varying link optical signal to noise ratio (OSNRExperimental demonstration of flexible bandwidth networking with real-time impairment awareness

Kolner, Brian H.

385

Real-Time Reconfiguration of MPLS/WDM Networks  

E-print Network

switched paths in real-time to accommodate changes in traffic demands ­ Adapts proactively to bothReal-Time Reconfiguration of MPLS/WDM Networks Mark Shayman LTS/UMIACS Review February 15, 2005 and control framework for MPLS/WDM networks that ­ Reconfigures both optical lightpaths and MPLS label

Gruner, Daniel S.

386

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

387

75 FR 68418 - Real-Time System Management Information Program  

Federal Register 2010, 2011, 2012, 2013

...2125-AF19 Real-Time System Management Information Program AGENCY...establish a Real-Time System Management Information Program that provides...delays. Data quality means the fitness of data for all purposes that...Statistical Areas by the Office of Management and Budget in the...

2010-11-08

388

Real-Time Control System Software for Intelligent System Development  

E-print Network

Real-Time Control System Software for Intelligent System Development: Experiments for more than two decades and us- ing it for the design and implementation of complex in- telligent control im- plementations), and a software handbook. Keywords: Software, real-time control, intelligent con

389

Real-time lane detection for autonomous vehicle  

Microsoft Academic Search

A lane detection based on a road model or feature needs correct acquisition of information on the lane in an image. It is inefficient to implement a lane detection algorithm through the full range of an image when it is applied to a real road in real time because of the calculation time. This paper defines two search ranges of

Seung Gweon Jeong; Chang Sup Kim; Dong Youp Lee; Sung Ki Ha; Dong Hwai Lee; Man Hyung Lee; Hideki Hashimoto

2001-01-01

390

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

391

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

392

Statistical analysis of real-time PCR data  

Microsoft Academic Search

Background: Even though real-time PCR has been broadly applied in biomedical sciences, data processing procedures for the analysis of quantitative real-time PCR are still lacking; specifically in the realm of appropriate statistical treatment. Confidence interval and statistical significance considerations are not explicit in many of the current data analysis approaches. Based on the standard curve method and other useful data

Joshua S. Yuan; Ann Reed; Feng Chen; C. Neal Stewart Jr.

2006-01-01

393

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 E­011­91 14 April 1991 Abstract SPLENDORS is a sample real time portfolio management application built using Profit. SPLENDORS provides a packaged library of common components as well as facilities

394

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.

395

Real-time Hydrology Ocean Atmosphere Prediction System  

E-print Network

and display systems #12;Hydrological Data Sources and Modeling Tools · Local Governments: utilities, planningRHOAPS Real-time Hydrology Ocean Atmosphere Prediction System Pronunciation: "Ropes" Motto: More than just THREDDS #12;Key Aspects · Integrated real-time data systems ­ Atmospheric ­ Hydrologic

396

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

397

Fieldbus application layer and real-time distributed systems  

Microsoft Academic Search

The author presents the application layer of Fieldbus as part of a real-time distributed system. The services of the layer must warrant the distributed process synchronization in real-time, and temporal and spatial data consistency. A model that fulfils these requirements is presented and a protocol with very low network and computational overhead is proposed. This protocol is intended to be

G. Ulloa

1991-01-01

398

A Groupware Toolkit for Building Real-Time Conferencing Applications  

E-print Network

GROUPKIT A Groupware Toolkit for Building Real-Time Conferencing Applications Mark Roseman Saul-6015 roseman@cpsc.ucalgary.ca ABSTRACT This paper presents our approach to the design of groupware toolkits on both the technical underpinnings necessary for real-time groupware, and on user-centered features

Greenberg, Saul

399

Toward Real-Time Component-based Systems  

Microsoft Academic Search

Component technology has become a central focus of software engineering in research and development. Reusability is a key factor that contributes to its success. The reuse of components can lead to a shortening of software development cycles and savings in software development costs. However, existing component models provide no support for real-time services and some real-time extensions of component models

Shengquan Wang; Sangig Rho; Riccardo Bettati; Wei Zhao

400

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...

401

Operator training simulator with real-time transient stability analysis  

Microsoft Academic Search

The operator training simulator (OTS) system, which is integrated with a real-time transient stability analysts program, has been in operation at the training center of Hokuriku Electric Power Company since July, 1990. The developed OTS system achieves real-time transient stability analysis with approximately 100 generator and 400 node power systems by parallel processing performed on a computer system with multiprocessor

S. Kyuwa; T. Yoshida; S. Yuasa; K. Omata; K. Mitamura

1993-01-01

402

Operator Training Simulator with real-time transient stability analysis  

Microsoft Academic Search

The Operator Training Simulator (OTS) system, which is integrated with a real-time transient stability analysis program, has been in operation at the training center of Hokuriku Electric Power Co., since July, 1990. The developed OTS system achieves real-time transient stability analysis with approximately 100 generator and 400 node power systems by parallel processing performed on a computer system with multiprocessor

S. Kyuwa; T. Yoshida; S. Yuasa; K. Omata; K. Mitamura

1994-01-01

403

Towards Real-Time High Frequency Ultrasound Imaging of Cells  

E-print Network

-thinning of lithium Niobate wafers for devices for high-frequency medical ultrasound imaging Srikanta Sharma, Jim McTowards Real-Time High Frequency Ultrasound Imaging of Cells Srikanta Sharma Academic supervisor;Research Aims · To develop a real time high frequency (up to 500 MHz) ultrasound scanning Bio

Greenaway, Alan

404

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

405

"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

406

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

407

A Simulation Based Model Checker for Real Time Java  

Microsoft Academic Search

The Real Time Specification for Java (RTSJ) is an augmen- tation of Java for real time applications. The possibility of applying a model checker to RTSJ has great appeal given the complexity and safety requirements of its intended applica- tions. The Robust Software Systems group at NASA Ames Research Center has Java PathFinder (JPF) under devel- opment, a Java model

Gary Lindstrom; Peter C. Mehlitz; Willem Visser

408

Scheduling of real-time communication network for parallel processing  

E-print Network

access and unbounded packet blocking time, making it very difficult to efficiently support real-time applications. To overcome this problem, this project proposes a new regulated-transmission approach in which packet transmission at the source...

Li, Hung

2012-06-07

409

A real-time simulator of a turbofan engine  

NASA Technical Reports Server (NTRS)

A real-time digital simulator of a Pratt and Whitney F100 engine has been developed for real-time code verification and for actuator diagnosis during full-scale engine testing. This self-contained unit can operate in an open-loop stand-alone mode or as part of closed-loop control system. It can also be used for control system design and development. Tests conducted in conjunction with the NASA Advanced Detection, Isolation, and Accommodation program show that the simulator is a valuable tool for real-time code verification and as a real-time actuator simulator for actuator fault diagnosis. Although currently a small perturbation model, advances in microprocessor hardware should allow the simulator to evolve into a real-time, full-envelope, full engine simulation.

Litt, Jonathan S.; Delaat, John C.; Merrill, Walter C.

1989-01-01

410

Monte Carlo Studies of Transverse Faraday Rotation Profiles  

NASA Astrophysics Data System (ADS)

Faraday Rotation measurements are a very important tool for investigating the magnetic (B) fields associated with the relativistic jets of Active Galactic Nuclei (AGN); for example, a toroidal or helical B field component should give rise to a systematic gradient in the observed Faraday rotation across the jet. However, real observed radio images have finite resolution. Typical beam sizes for cm-wavelength Very Long Baseline Interferometry (VLBI) observations are often comparable to or larger than the observed jet widths, raising questions about how well resolved a jet must be in the transverse direction in order to reliably detect transverse Faraday-rotation structure. The results of new simulations of Faraday rotation images designed to directly investigate this question are presented, together with studies of the probabilities of observing spurious Faraday Rotation gradients as a result of random noise and finite resolution. These simulations clearly demonstrate the possibility of detecting transverse Faraday-rotation structures even when the observed intrinsic jet widths are considerably smaller than the beam width.

Murphy, Eoin; Gabuzda, Denise

2013-12-01

411

A Framework to model real-time databases  

Microsoft Academic Search

Real!time databases deal with time!constrained data and time!constrained transactions. The design of this kind of databases requires the introduction of new concepts to support both data structures and the dynamic behaviour of the database. In this paper, we give an overview about different aspects of real!time dat abases and we clarify requirements of their modelling. Then, we present a framework

Nizar Idoudi; Nada Louati; Claude Duvallet; Rafik Bouaziz; Bruno Sadeg

412

A framework to model real-time databases  

Microsoft Academic Search

Real-time databases deal with time-constrained data and time-constrained transactions. The design of this kind of databases requires the introduction of new concepts to sup- port both data structures and the dynamic behaviour of the database. In this paper, we give an overview about differ- ent aspects of real-time databases and we clarify require- ments of their modelling. Then, we present

Nizar Idoudi; Nada louati; Claude Duvallet; Bruno Sadeg; Rafik Bouaziz; Faiez Gargouri

2010-01-01

413

Real-time communication in FieldBus multiaccess networks  

Microsoft Academic Search

There has been an increasing need of timely and predictablecommunication services for embedded real-time systemsin automated factories and industrial process controls.Work has been done on real-time communicationwith deadline guarantees in point-to-point, token bus\\/tokenring\\/FDDI, and DQDB (Distributed Queue Dual Bus) networks.However, due to the random access nature of theCSMA\\/CD type multiaccess networks, they are not suitablefor applications with stringent timing constraints.

Ching-chih Han; Kang G. Shin

1995-01-01

414

Real time simulation using position sensing  

NASA Technical Reports Server (NTRS)

An interactive exercise system including exercise equipment having a resistance system, a speed sensor, a controller that varies the resistance setting of the exercise equipment, and a playback device for playing pre-recorded video and audio. The controller, operating in conjunction with speed information from the speed sensor and terrain information from media table files, dynamically varies the resistance setting of the exercise equipment in order to simulate varying degrees of difficulty while the playback device concurrently plays back the video and audio to create the simulation that the user is exercising in a natural setting such as a real-world exercise course.

Studor, George F. (Inventor); Womack, Robert W. (Inventor); Hilferty, Michael F. (Inventor); Isbell, William B. (Inventor); Taylor, Jason A. (Inventor); Bacon, Bruce R. (Inventor)

2000-01-01

415

Reviewing real-time performance of nuclear reactor safety systems  

SciTech Connect

The purpose of this paper is to recommend regulatory guidance for reviewers examining real-time performance of computer-based safety systems used in nuclear power plants. Three areas of guidance are covered in this report. The first area covers how to determine if, when, and what prototypes should be required of developers to make a convincing demonstration that specific problems have been solved or that performance goals have been met. The second area has recommendations for timing analyses that will prove that the real-time system will meet its safety-imposed deadlines. The third area has description of means for assessing expected or actual real-time performance before, during, and after development is completed. To ensure that the delivered real-time software product meets performance goals, the paper recommends certain types of code-execution and communications scheduling. Technical background is provided in the appendix on methods of timing analysis, scheduling real-time computations, prototyping, real-time software development approaches, modeling and measurement, and real-time operating systems.

Preckshot, G.G. [Lawrence Livermore National Lab., CA (United States)

1993-08-01

416

Myrinet Real Time Protocol with flexible routing  

E-print Network

in the network interface card. The advantage of flexible routing is better resource utilization but at the cost of increased connection establishment time. A suite of experiments was performed to measure the connection establishment time and admission probability...

Kini, Savita

2012-06-07

417

Utilizing real-time and near real-time data in the iNtegrated Space Weather Analysis System  

Microsoft Academic Search

Access to near real-time and real-time space weather data is essential to accurately specifying and forecasting the space environment. The Space Weather Desk at NASA Goddard Space Flight Center's Space Weather Laboratory provides vital space weather forecasting services primarily to NASA robotic mission operators, as well as external space weather stakeholders including the Air Force Weather Agency. A key component

M. M. Maddox; R. E. Mullinix; L. Rastaetter; A. Pulkkinen; Y. Zheng; D. Berrios; M. Hesse; M. M. Kuznetsova; A. Taktakishvili; A. Chulaki; J. Shim; S. S. Bakshi; K. D. Patel; P. Jain

2010-01-01

418

Emerging Trends of Computational Grid Based Near Real Time\\/Real Time Flood Assessment and Forecasting Models  

Microsoft Academic Search

From recent past, the computational Grid based flood assessment and forecasting models is getting emerged as an interdisciplinary integrated `near real time\\/real time model'. Many such, Grid based flood assessment and forecasting model supports in logically integrating various components of flood related scientific simulations such as Metrological, Hydrological, Hydraulic, RADAR, LIDAR Remote Sensing, GIS, Satellite Communication and other technologies and

M. Manavalan; S. Chattopadhyay; M. Mangala; Y. S. Rao

2010-01-01

419

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.

420

J.A. Barchanski, RealTime Streaming Video for Ethernet LANs RealTime Streaming Video  

E-print Network

J.A. Barchanski, Real­Time Streaming Video for Ethernet LANs 1 Real­Time Streaming Video for Ethernet LANs b y Jerzy A. Barchanski Brock University Department of Computer Science St. Catharines of video display on personal computers connected to Ethernet LANs, which are commonly used on university

421

Towards Mechanization of Real-Time System Design  

Microsoft Academic Search

\\u000a Real-time software is used to control external devices (e.g., in automobiles, robotics, telephone switches) subject to stringent\\u000a timing constraints. As the requirements of real-time systems become more complex, the design of real-time software will require\\u000a formal techniques and automated design tools. In this paper, we shall discuss some of the major issues in mechanizing the\\u000a specification, validation\\/verification, and synthesis of

Aloysius K. Mok

422

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

423

Toward Real-Time Performance Benchmarks for Ada  

Microsoft Academic Search

Benchmarks are developed to measure the Ada notion of time, the Ada features believed important to real-time performance, and other time-related features that are not part of the language, but are part of the run-time system; these benchmarks are then applied to the language and run-time system, and the results evaluated.

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

1986-01-01

424

DRDB: Towards Distributed RealTime Database Services for TimeCritical Active Applications  

E-print Network

may be at stake. As real­time systems continue to evolve, their applications become more complex management functionalities in real­time systems poses formidable intellectual and engineering challenges to database researchers and practitioners. Transactions in real­time database systems should be scheduled

Son, Sang H.

425

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

Code of Federal Regulations, 2013 CFR

...transaction and pricing data in real-time for all publicly reportable...transaction and pricing data in real-time shall perform, on an annual...in a consistent, usable and machine-readable electronic format...publicly disseminated in real-time shall be corrected or...

2013-04-01

426

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

...transaction and pricing data in real-time for all publicly reportable...transaction and pricing data in real-time shall perform, on an annual...in a consistent, usable and machine-readable electronic format...publicly disseminated in real-time shall be corrected or...

2014-04-01

427

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

Code of Federal Regulations, 2012 CFR

...transaction and pricing data in real-time for all publicly reportable...transaction and pricing data in real-time shall perform, on an annual...in a consistent, usable and machine-readable electronic format...publicly disseminated in real-time shall be corrected or...

2012-04-01

428

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

SciTech Connect

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.

Brault, C.; Gil, C.; Spuig, P. [CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France); Boboc, A. [EURATOM-CCFE Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB (United Kingdom); Collaboration: JET-EFDA Contributors

2011-04-15

429

Time-Triggered Message-Triggered Object Modeling of a Distributed Real-Time Control Application for Its Real-Time Simulation  

Microsoft Academic Search

The time-triggered message-triggered object (TMO) has been devised as the basic component model for high level distributed real time programming as well as real time application system\\/subsystem design and modeling. One of the strengths of the TMO is its facilitation of multi-phased top-down modeling of real time distributed computing application systems. TMO-structured models are capable of representing both a real

Moon-hae Kim; Jung-guk Kim; K. H. Kim; Myeong-soo Lee; Shin-yeol Park

2000-01-01

430

Space Shuttle Main Engine real time stability analysis  

NASA Technical Reports Server (NTRS)

The Space Shuttle Main Engine (SSME) is a reusable, high performance, liquid rocket engine with variable thrust. The engine control system continuously monitors the engine parameters and issues propellant valve control signals in accordance with the thrust and mixture ratio commands. A real time engine simulation lab was installed at MSFC to verify flight software and to perform engine dynamic analysis. A real time engine model was developed on the AD100 computer system. This model provides sufficient fidelity on the dynamics of major engine components and yet simplified enough to be executed in real time. The hardware-in-the-loop type simulation and analysis becomes necessary as NASA is continuously improving the SSME technology, some with significant changes in the dynamics of the engine. The many issues of interfaces between new components and the engine can be better understood and be resolved prior to the firing of the engine. In this paper, the SSME real time simulation Lab at the MSFC, the SSME real time model, SSME engine and control system stability analysis, both in real time and non-real time is presented.

Kuo, F. Y.

1993-01-01

431

Developing infrared array controller with software real time operating system  

Microsoft Academic Search

Real-time capabilities are required for a controller of a large format array to reduce a dead-time attributed by readout and data transfer. The real-time processing has been achieved by dedicated processors including DSP, CPLD, and FPGA devices. However, the dedicated processors have problems with memory resources, inflexibility, and high cost. Meanwhile, a recent PC has sufficient resources of CPUs and

Shigeyuki Sako; Takashi Miyata; Tomohiko Nakamura; Kentaro Motohara; Yuka Katsuno Uchimoto; Takashi Onaka; Hirokazu Kataza

2008-01-01

432

MARS: the magnet II real-time scheduling algorithm  

Microsoft Academic Search

A real-time scheduling algorithm for Asynchronous Time Sharing based switching nodes is presented. Three classes of traffic sources are considered to load the swit thing nodes: real-time video sources with guaranteed maximum end-to-end delay S1 for all cells; realtime voice sources with guaranteed end-to-end delay SII, c% cell loss rate and average gap length q; and data traffic with guaranteed

Jay Hyman; Aurel A. Lazar; Giovanni Pacifici

1991-01-01

433

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

434

Real-Time Network Emulation with ns-2  

Microsoft Academic Search

Abstract: The network simulator ns-2 implements both wirelessnetworks and emulation -- a feature that allows to simulatea network environment among real stations. However,the real-time requirements of a network emulation introducean inaccurate timing behavior of the simulator scheduler.These timing errors have a negative impact on the performanceof network protocols in ns-2. Even more, they lead tofalse simulation results in the IEEE

Daniel Mahrenholz; Svilen Ivanov

2004-01-01

435

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

436

A GPS Real Time Earthquake and Tsunami (GREAT) Alert System  

Microsoft Academic Search

The GREAT Alert is a NASA-sponsored, real-time prototype system designed to enhance natural hazard warning capability and damage assessment. The system takes advantage of the increasingly available global and regional real-time GPS data, as well as advanced fault and ocean dynamics models to enable more accurate and timely assessment of the magnitude and mechanism of large earthquakes, and the magnitude

Yoaz Bar-Sever

2010-01-01

437

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

438

Elapsed Time in the Real World  

NSDL National Science Digital Library

This 3-lesson unit develops students' abilities to measure and model elapsed time in various ways. Students construct clocks, time line models, and they read and interpret schedules. The lessons employ hands on activities, interactive technology, and literature to enhance understanding. Student materials, assessments and solutions are provided.

Maple, John; Straub, Kristie

2007-01-01

439

The Durham adaptive optics real-time controller  

E-print Network

The Durham adaptive optics real-time controller was initially a proof of concept design for a generic adaptive optics control system. It has since been developed into a modern and powerful CPU based real-time control system, capable of using hardware acceleration (including FPGAs and GPUs), based primarily around commercial off the shelf hardware. It is powerful enough to be used as the real-time controller for all currently planned 8~m class telescope adaptive optics systems. Here we give details of this controller and the concepts behind it, and report on performance including latency and jitter, which is less than 10~$\\mu$s for small adaptive optics systems.

Basden, Alastair; Myers, Richard; Younger, Eddy

2010-01-01

440

Interfacing Real-time Linux and LabVIEW  

NASA Astrophysics Data System (ADS)

Real-time Linux is a set of extensions to the kernel that provides hard real-time functionality with low, bounded latencies and deterministic response. The main methods for communicating between kernel space and user space are fifos and shared memory. LabVIEW is the well-known commercial product for developing control systems and engineering applications. This paper, presents the fifos and shared memory virtual interface (VIs) that allow LabVIEW to communicate and share (bulk) data with the real-time core.

Daly, P. N.

441

Formal methods for dependable real-time systems  

NASA Technical Reports Server (NTRS)

The motivation for using formal methods to specify and reason about real time properties is outlined and approaches that were proposed and used are sketched. The formal verifications of clock synchronization algorithms are concluded as showing that mechanically supported reasoning about complex real time behavior is feasible. However, there was significant increase in the effectiveness of verification systems since those verifications were performed, at it is to be expected that verifications of comparable difficulty will become fairly routine. The current challenge lies in developing perspicuous and economical approaches to the formalization and specification of real time properties.

Rushby, John

1993-01-01

442

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

443

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

444

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

445

A probabilistic performance metric for real-time system design  

Microsoft Academic Search

At the system level design of a real-time embedded system, a majorissue is to identify from alternative architectures the best one whichsatisfies the timing constraints. This issue leads to the need of ametric that is capable of evaluating the overall system timing performance.Some of the previous work in the related areas focus onpredicting the system's timing performance based on a

Tao Zhou; Edwin Hsing-Mean Sha

1999-01-01

446

Biology's built-in Faraday cages  

NASA Astrophysics Data System (ADS)

Biological fluids are water-based, ionic conductors. As such, they have both high relative dielectric constants and substantial conductivities, meaning they are lossy dielectrics. These fluids contain charged molecules (free charges), whose movements play roles in essentially all cellular processes from metabolism to communication with other cells. Using the problem of a point source in air above a biological fluid of semi-infinite extent, the bound charges in the fluid are shown to perform the function of a fast-acting Faraday cage, which protects the interior of the fluid from external electric fields. Free charges replace bound charges in accordance with the fluid's relaxation time, thereby providing a smooth transition between the initial protection provided by the bound charges and the steady state protection provided by the free charges. The electric fields within the biological fluid are thus small for all times just as they would be inside a classical Faraday cage.

Klee, Maurice M.

2014-05-01

447

Timing analysis and conditional scheduling in a real-time system design environment  

Microsoft Academic Search

This paper presents an approach to carry out timing analysis and scheduling in a real-time system design environment for flexible manufacturing systems. It is built based on a formal model for specifying real-time systems using extended timed Petri nets. The designer uses the model to specify a design at a given level. The functional characteristics as well as timing properties

Zebo Peng; A. Torne

1994-01-01

448

Hard Real-Time Communication with the Timed Token Protocol: Current State and Challenging Problems  

Microsoft Academic Search

With the increasing use of distributed real-time systems, the ability of communication networks to handle real-time traffic is becoming more and more important. The timed token medium access control protocol, which has been now incorporated into several network standards such as FDDI and SAFENET due to its special timing property of bounded medium access time, is one of the most

Sijing Zhang; Alan Burns; Jing Chen; E. Stewart Lee

2004-01-01

449

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.

450

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.

451

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

452

Real-time 3D range sensor  

NASA Astrophysics Data System (ADS)

A new technique for making high speed measurements of complete scenes of three- dimensional objects is described. The sensor has several advantages over Moire, time-of-flight and conventional structured-light systems including a data acquisition time of 0.1 milliseconds, a processing time of 100 milliseconds and a measurement standard deviation of 1/2000 of the field of view. It is robust to ambient lighting, able to measure across surface discontinuities, and capable of measuring moving objects. The technique uses a fan of laser planes to illuminate the scene and two solid-state video cameras to measure the stripes in the scene. The methods for disambiguating and triangulating the stripes into three-dimensional coordinates are given and an example reconstructed scene from a prototype sensor is presented.

Gordon, Steven J.

1993-05-01

453

Developing infrared array controller with software real time operating system  

NASA Astrophysics Data System (ADS)

Real-time capabilities are required for a controller of a large format array to reduce a dead-time attributed by readout and data transfer. The real-time processing has been achieved by dedicated processors including DSP, CPLD, and FPGA devices. However, the dedicated processors have problems with memory resources, inflexibility, and high cost. Meanwhile, a recent PC has sufficient resources of CPUs and memories to control the infrared array and to process a large amount of frame data in real-time. In this study, we have developed an infrared array controller with a software real-time operating system (RTOS) instead of the dedicated processors. A Linux PC equipped with a RTAI extension and a dual-core CPU is used as a main computer, and one of the CPU cores is allocated to the real-time processing. A digital I/O board with DMA functions is used for an I/O interface. The signal-processing cores are integrated in the OS kernel as a real-time driver module, which is composed of two virtual devices of the clock processor and the frame processor tasks. The array controller with the RTOS realizes complicated operations easily, flexibly, and at a low cost.

Sako, Shigeyuki; Miyata, Takashi; Nakamura, Tomohiko; Motohara, Kentaro; Uchimoto, Yuka Katsuno; Onaka, Takashi; Kataza, Hirokazu

2008-07-01

454

Some Unresolved Problems in Real-Time Design  

Microsoft Academic Search

Real-time systems are among the most complex software systems to design and construct. This short position paper outlines some of the most pressing research problems that need to be addressed. They are all related to the concept of\\

Bran Selic

2004-01-01

455

An approach to real-time system design  

Microsoft Academic Search

We propose an approach to real-time systems software design, which helps a designer to obtain the modular, reliable and predictable system. Our approach is the combination of structured design techniques and formal analysis techniques

S. Vuckovic; Milun Jevtic; J. Vuckovic

1995-01-01

456

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

457

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

458

Real-time national GPS networks: Opportunities for atmospheric sensing  

Microsoft Academic Search

Real-time national Global Positioning System (GPS) networks are being established in a number of countries for atmospheric sensing. UCAR, in collaboration with participating universities, is developing one of these networks in the United States. The network, named \\

R. H. Ware; D. W. Fulker; S. A. Stein; D. N. Anderson; S. K. Avery; R. D. Clark; K. K. Droegemeier; J. P. Kuettner; J. Minster; S. Sorooshian

2000-01-01

459

Real time reconstruction of quasiperiodic multi parameter physiological signals  

E-print Network

A modern intensive care unit (ICU) has automated analysis systems that depend on continuous uninterrupted real time monitoring of physiological signals such as electrocardiogram (ECG), arterial blood pressure (ABP), and ...

Ganeshapillai, Gartheeban

460

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

461

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

462

Supporting Real-time Communication in Wireless Mesh Networks  

E-print Network

Tel: +41 31 5112637/2631, Email: {staub|braun}@iam.unibe.ch Abstract: Wireless Mesh Networks are a key the deployment of real-time applications in WMNs is challenging. We propose to use path diversity and multi

Braun, Torsten

463

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

464

Real-time analog acquisition of electrophysiological signals with Soma  

E-print Network

Soma is a high-density recording system for real-time acquisition and analysis of extracellular electrophysiological signals. Here I describe the design, implementation, and evaluation of the Soma Acquisition Board, an ...

Jonas, Eric Michael

2009-01-01

465

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

466

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

467

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

468

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

469

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

470

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

471

Feature-relative real-time obstacle avoidance and mapping  

E-print Network

A substantial challenge in robotics is integration of complex software systems for real- time performance. This thesis integrates the robust and generic mapping framework Atlas, a feature-based local Simultaneous Localization ...

Leedekerken, Jacques Chadwick

2005-01-01

472

An integrated package for real-time security enhancement  

SciTech Connect

This paper describes a set of algorithms for security-constrained optimal power flow (SCOPF) and their configuration in an integrated package for real-time security enhancement. The SCOPF algorithms and the insights gained from their implementation are discussed.

Bertram, T.J.; Demaree, K.D.; Dangelmaier, L.C. (ESCA Corp., Bellevue, WA (USA))

1990-05-01

473

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

474

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.

Shalkhauser, Mary J. (inventor); Whyte, Wayne A., Jr. (inventor); Barnes, Scott P. (inventor)

1990-01-01

475

Spectral image processing in real-time  

Microsoft Academic Search

The fields of classical image processing and optical spectroscopy developed independently since a long time. While the first subject deals with pictorial information that uses the description of material by their surfaces in terms of brightness, texture and color depending on the illumination in the two dimensional field of view of the optics, the second one classifies usually material properties

Matthias F. Carlsohn

2006-01-01

476

Real-Time Discriminative Background Subtraction  

Microsoft Academic Search

The authors examine the problem of segmenting foreground objects in live video when background scene tex- tures change over time. In particular, we formulate background subtraction as minimizing a penalized instantaneous risk func- tional—yielding a local online discriminative algorithm that can quickly adapt to temporal changes. We analyze the algo- rithm's convergence, discuss its robustness to nonstationarity, and provide an

Li Cheng; Minglun Gong; Dale Schuurmans; Terry Caelli

2011-01-01

477

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

478

Pragmatic verification for hybrid and real-time designs  

Microsoft Academic Search

Hybrid and real-time designs are ubiquitous in computing and control systems. There are three prevalent methods for verifying real-time and hybrid systems: simulation, model-checking, and theorem proving. None of these approaches are ideal. This paper presents a verification approach based on refinement. In our refinement framework, we first establish safety properties for a simplified, abstract model of the design and

Mark R. Greenstreet

2000-01-01

479

Teaching Software Engineering for Real-Time Design  

Microsoft Academic Search

Designing software for real-time systems continues to be a challenge. In addition to functional requirements, real-time systems typically have strict requirements in the areas of performance, size, and the need for concurrency which complicates the design process[PRE87]. The best design will depend on the particular requirements of a system. A designer must learn to apply principles for determining which design

Conni Goodman Marchewka

1991-01-01

480

An integrated approach for real-time system design  

Microsoft Academic Search

A variety of tools, based on object-oriented design methodology, are already available commercially. Many new tools are being developed. However, tools for the design of real-time systems are still scarce. This paper presents a working environment for the development of real-time systems. This working environment is a collection of CASE tools, which are a heavy graphical orientation intended for the

Lichen Zhang; Peijiang Yuan

1999-01-01

481

Visual Assessment of a Real-Time System Design  

Microsoft Academic Search

In this paper we describe our experiments on a realtimesystem design, focusing on design alternativessuch as scheduling jitter, sensor-to-output latency, intertaskcommunication schemes and the system utilization.The prime objective of these experiments was toevaluate a real-time design produced using the periodcalibration method [2] and thus identify the limitationsof the method. We chose a computerized numericalcontrol (UNU) machine as our target real-time

Namyun Kim; Minsoo Ryu; Seongsoo Hong; Manas Saksena; Chong-ho Choi; Heonshik Shin

1996-01-01

482

Environment and tool for hard real-time systems design  

Microsoft Academic Search

To automate the transition from the specification of a hard real-time system to its design, a design aid tool has been defined. It allows the description of a hard-real-time system using a synchronous visual language, the automatic transformation of the description in order to comply with the temporal constraints indicated in the system specification, and the research of an optimised

L. Carcagno; M. De Michiel; D. Dours; R. Facca; B. Sautet

1994-01-01

483

A Period Assignment Algorithm for Real-Time System Design  

Microsoft Academic Search

Digital controllers found in many industrial real-time systems consist of a number of interacting periodic tasks. To sustain\\u000a the required control quality, these tasks possess the maximum activation periods as performance constraints. An essential\\u000a step in developing a real-time system is thus to assign each of these tasks a constant period such that the maximum activation\\u000a requirements are met while

Minsoo Ryu; Seongsoo Hong

1999-01-01

484

Real-time operating environmentfor networked control systems  

Microsoft Academic Search

This paper presents the development of a novel real-time operating environment for networked control systems (NCSs). An open-loop unstable magnetic-levitation (maglev) test bed was constructed and used to develop an NCS with real-time application interface (RTAI). A client-server architecture on a local-area network was developed with the network communication based on the user datagram protocol. The control loop of our

Won-jong Kim; Kun Ji; Ajit Ambike

2006-01-01

485

Real-Time Control of Networked Control Systems via Ethernet  

Microsoft Academic Search

In this paper, we discuss real-time control of networked control systems (NCSs) and practical issues in the choice of the communication networks for this purpose. An appropriate integration of control systems, real-time environments, and network communication systems allows the optimization of the quality-of-control (QoC) in NCSs. We compare several prevailing network types that may be used in control applications to

Kun Ji; Won-jong Kim

2005-01-01

486

Real-time operating systems for multicore embedded systems  

Microsoft Academic Search

Multicore systems-on-chip have become popular in the design of embedded systems in order to simultaneously achieve high performance and low power consumption. On the software side, real-time operating systems are necessary in order to handle growing complexity of embedded software. This paper describes requirements, design principles and implementation techniques for real-time operating systems to be used in asymmetric multicore systems.

Hiroyuki Tomiyama; Shinya Honda; Hiroaki Takada

2008-01-01

487

Real-time operating systems at higher control  

Microsoft Academic Search

Although virtually all development of real-time operating systems focuses on the lowest of the three traditional control levels, sheet economics demands higher level real-time OSs. Meeting this demand requires a major change in the mindset of the people who have been focusing on the lowest level of control. {open_quotes}These people are trying to deal with an elephant`s tail, but they

1995-01-01

488

A new DSP real-time operating system  

Microsoft Academic Search

With the development of microprocessors, DSP has already started to become mainstream in the field of embedded system development. By the DSP real-time operating system, the multi-task achieve concurrent processing, thereby improving its performance. Real-time operating system in DSP multitask processor system can effectively reduce the difficulty of system development, improve system reliability and scalability. This paper first briefly introduces

Zhen Wang; Linsheng Li

2010-01-01

489

MERT - a multi-environment real-time operating system  

Microsoft Academic Search

MERT is a multi-environment real-time operating system for the Digital Equipment PDP-11\\/45 and 11\\/70 computers. It is a structured operating system built on top of a kernel which provides the basic services such as memory management, process scheduling, and trap handling needed to build various operating system environments. Real-time response to processes is achieved by means of preemptive priority scheduling.

D. L. Bayer; H. Lycklama

1975-01-01

490

Video receiver based real-time estimation of channel capacity  

Microsoft Academic Search

This paper examines the problem of real-time estimation of the capacity, which is also known as the bottleneck bandwidth, of a network path using end-to-end measurements in a video streaming application. We utilize two basic packet-pair bandwidth-sampling methods and show how they can be applied in real-time to the video traffic. We then examine the performance of both sampling methods

Dmitri Loguinov; Hayder Radha

2002-01-01

491

Real-time motion segmentation from moving cameras  

Microsoft Academic Search

This paper describes our approach to real-time detection of camera motion and moving object segmentation in videos acquired from moving cameras. As far as we know,none of the proposals reported in the literature are able to meet real-time requirements. In this work,we present an approach based on a color segmentation followed by a region-merging on motion through Markov Random Fields

Rita Cucchiara; Andrea Prati; Roberto Vezzani

2004-01-01

492

Distributed Advance Reservation of Real-Time Connections  

Microsoft Academic Search

The ability to reserve real-time connections in advance is essential in all distributedmulti-party applications (i.e., applications involving multiple human beings)using a network that controls admissions to provide good quality of service. Thispaper discusses the requirements of the clients of an advance reservation service, anda distributed design for such a service. The design is described within the context ofthe Tenet Real-Time

Domenico Ferrari; Amit Gupta; Giorgio Ventre

1995-01-01

493

Real-time implementing wavefront reconstruction for adaptive optics  

Microsoft Academic Search

The capability of real time wave-front reconstruction is important for an adaptive optics (AO) system. The bandwidth of system and the real-time processing ability of the wave-front processor is mainly affected by the speed of calculation. The system requires enough number of subapertures and high sampling frequency to compensate atmospheric turbulence. The number of reconstruction operation is increased accordingly. Since

Caixia Wang; Mei Li; Chunhong Wang; Luchun Zhou; Wenhan Jiang

2004-01-01

494

SMART (Strategic Memory Allocation for Real-Time) Cache Design  

Microsoft Academic Search

A discussion is presented as to why the present approach to cache architecture design results in unpredictable performance improvements in real-time systems with priority-based preemptive scheduling algorithms. The SMART cache design is shown to be compatible with the goals of scheduling in a real-time system. The results of this research provide a scheme not only for utilizing the performance enhancement

David B. Kirk

1989-01-01

495

MonoSLAM: Real-Time Single Camera SLAM  

Microsoft Academic Search

We present a real-time algorithm which can recover the 3D trajectory of a monocular camera, moving rapidly through a previously unknown scene. Our system, which we dub MonoSLAM, is the first successful application of the SLAM methodology from mobile robotics to the 'pure vision' domain of a single uncontrolled camera, achieving real-time but drift-free performance inaccessible to Structure from Motion

Andrew J. Davison; Ian D. Reid; Nicholas D. Molton; Olivier Stasse

2007-01-01

496

Real-time simulator for power system dynamics studies  

Microsoft Academic Search

The addition of dynamic models of loads, machines and subtransmission networks to the existing three-phase real-time simulator of Hydro-Quebec (IREQ), has made available a tool appropriate for the study of power system dynamics in real time. The valid frequency range of the simulator, which already covered harmonics up to 2000 Hz, has been extended to include machine dynamics in the

Harbans Nakra; R. L. Vaughan; C. Gagnon; A. Venne; C. Thomassin; J. Gagnon

1995-01-01

497

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

498

Innovations within the Altair real-time wavefront reconstructor  

Microsoft Academic Search

The Gemini North adaptive optics system Altair utilises five cooperative CPU's to perform all the associated real-time tasks. One, the reconstructor (RTC), manages all of the highest speed hard real-time duties. As well as the core, computationally intensive, wavefront reconstruction, this processor implements a number of algorithms providing control system support services. These include: the quad-cell centroid gain estimation, determination

Leslie K. Saddlemyer; Glen Herriot; Jean-Pierre Vrran; Malcolm Smith; Jennifer Dunn

2004-01-01

499

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

500

Support Industrial Hard Real-Time Traffic with Switched Ethernet  

Microsoft Academic Search

This paper presents a simple and efficient switched Ethernet communication protocol for industrial hard real-time LAN applications. The network is founded with end nodes and a switch, and hard real-time communication is handled by software added between the Ethernet protocols and the TCP\\/IP suites. We established a virtual link of the source and destination node by applying admission control based

Alimujiang Yiming; Toshio Eisaka

2005-01-01