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1

Faraday waves under time-reversed excitation.  

PubMed

Do parametrically driven systems distinguish periodic excitations that are time mirrors of each other? Faraday waves in a Newtonian fluid are studied under excitation with superimposed harmonic wave forms. We demonstrate that the threshold parameters for the stability of the ground state are insensitive to a time inversion of the driving function. This is a peculiarity of some dynamic systems. The Faraday system shares this property with standard electroconvection in nematic liquid crystals [J. Heuer et al., Phys. Rev. E 78, 036218 (2008)]. In general, time inversion of the excitation affects the asymptotic stability of a parametrically driven system, even when it is described by linear ordinary differential equations. Obviously, the observed symmetry has to be attributed to the particular structure of the underlying differential equation system. The pattern selection of the Faraday waves above threshold, on the other hand, discriminates between time-mirrored excitation functions. PMID:23496716

Pietschmann, Dirk; Stannarius, Ralf; Wagner, Christian; John, Thomas

2013-03-01

2

real time LTL 1 Real Time LTL  

E-print Network

real time LTL 1 Real Time LTL ' ::= p j :' j (' ^ ') j X' j (' U') j #20; 1 #20; #20; 2 j #20; 1 freeze quanti#12;cation. real time LTL 2 Examples \\Every request p is followed by a response q within 10 time units." Gx:(p ) Fy:(q ^ y #20; x + 10)) \\Eventually within 10 time units p holds." x:Fy:(p ^ y #20

Popeea, Corneliu - Chair for Foundations of Software Reliability and Theoretical Computer Science

3

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

NASA Astrophysics Data System (ADS)

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

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

2014-09-01

4

Nearly degenerate time-resolved Faraday rotation in an interacting exciton system  

NASA Astrophysics Data System (ADS)

We report experimental studies of nearly degenerate time-resolved Faraday rotation (TRFR) of electron spin precession in an interacting exciton system. We show that many-body interactions between excitons strongly modify the TRFR response through the coupling of the spin coherence to two-exciton states. The striking difference between TRFR and transient differential absorption (DA) further reveals that exciton-exciton interactions play crucial but qualitatively different roles in TRFR and DA.

Shen, Yumin; Goebel, A. M.; Khitrova, G.; Gibbs, H. M.; Wang, Hailin

2005-12-01

5

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

6

Real-Time Simulation  

NASA Technical Reports Server (NTRS)

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

1997-01-01

7

Real-time sonography  

SciTech Connect

This textbook acquaints the reader with normal and pathologic anatomy as depicted on dynamic or real-time scanning. Chapters are organized by specialty, such as abdominal, urologic, or pediatric. The text is illustrated with still-frame images and line drawings. The drawings show important areas of interest and provide graphic notation as to where and in what orientation the scan was obtained.

Fleischey, A.C.; James, A.E. Jr.

1984-01-01

8

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

9

Real-Time for the Real World  

Microsoft Academic Search

We propose a new methodology for creating embedded software that meets real-time deadlines. Our approach is a synthesis of real-time analysis and traditional sys- tems debugging techniques, based on two main ideas. First, we use probabilistic modeling techniques to make quantitative predictions about system behavior, as op- posed to real-time analysis techniques whose results are binary and often pessimistic (either

John Regehr; Alastair Reid; Kirk Webb; Michael Parker; Jay Lepreau

2002-01-01

10

Real-Time PCR  

NASA Astrophysics Data System (ADS)

Over the past few years there has been a considerable development of DNA amplification by polymerase chain reaction (PCR), and real-time PCR has now superseded conventional PCR techniques in many areas, e.g., the quantification of nucleic acids and genotyping. This new approach is based on the detection and quantification of a fluorescent signal proportional to the amount of amplicons generated by PCR. Real-time detection is achieved by coupling a thermocycler with a fluorimeter. This chapter discusses the general principles of quantitative real-time PCR, the different steps involved in implementing the technique, and some examples of applications in medicine. The polymerase chain reaction (PCR) provides a way of obtaining a large number of copies of a double-stranded DNA fragment of known sequence. This DNA amplification technique, developed in 1985 by K. Mullis (Cetus Corporation), saw a spectacular development over the space of a few years, revolutionising the methods used up to then in molecular biology. Indeed, PCR has many applications, such as the detection of small amounts of DNA, cloning, and quantitative analysis (assaying), each of which will be discussed further below.

Evrard, A.; Boulle, N.; Lutfalla, G. S.

11

Ultrafast time-resolved faraday rotation in EuO thin films.  

PubMed

We have investigated the ultrafast spin dynamics in EuO thin films by time-resolved Faraday rotation spectroscopy. The photoinduced magnetization is found to be increased in a transient manner, accompanied with subsequent demagnetization. The dynamical magnetization enhancement showed a maximum slightly below the Curie temperature with prolonged tails toward both lower and higher temperatures and dominates the demagnetization counterpart at 55 K. The magnetization enhancement component decays in ~1 ns. The realization of the transient collective ordering is attributable to the enhancement of the f-d exchange interaction. PMID:23004656

Liu, F; Makino, T; Yamasaki, T; Ueno, K; Tsukazaki, A; Fukumura, T; Kong, Y; Kawasaki, M

2012-06-22

12

Ultrafast Time-Resolved Faraday Rotation in EuO Thin Films  

NASA Astrophysics Data System (ADS)

We have investigated the ultrafast spin dynamics in EuO thin films by time-resolved Faraday rotation spectroscopy. The photoinduced magnetization is found to be increased in a transient manner, accompanied with subsequent demagnetization. The dynamical magnetization enhancement showed a maximum slightly below the Curie temperature with prolonged tails toward both lower and higher temperatures and dominates the demagnetization counterpart at 55 K. The magnetization enhancement component decays in ˜1ns. The realization of the transient collective ordering is attributable to the enhancement of the f-d exchange interaction.

Liu, F.; Makino, T.; Yamasaki, T.; Ueno, K.; Tsukazaki, A.; Fukumura, T.; Kong, Y.; Kawasaki, M.

2012-06-01

13

Real time automated inspection  

DOEpatents

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

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

1985-05-21

14

Real time automated inspection  

DOEpatents

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

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

1985-01-01

15

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

16

Real Time Spectral Analysis  

NASA Astrophysics Data System (ADS)

For signal analysis, Fourier transform and linear prediction methods are the main approaches. In recent years, wavelet transform which gives the expression of time-frequency domain has been receiving attention. In the wavelet transform, scale and shift operations are used to analyze regional waves in signal. In this paper, we propose a new method for signal analysis. Instead of the wavelet, short sine waves and short cosine waves which have slightly different frequencies and phases established beforehand are used. These frequencies and phases play the same role as a wavelet to analyze a regional wave in signal. However, our proposed method is different from the wavelet transform because it does not use multi-resolution analysis. In conventional spectral analysis methods, all data are prepared beforehand and calculations are carried out using these data. In our proposed method, spectrum is updated whenever the new signal data comes in. We show that the amount of calculation takes a remarkable reduction and it realizes real time spectral analysis. Finally, we show the vocal sounds analysis using the proposed method.

Nakatsuji, Hideto; Omatu, Sigeru

17

Students Collecting Real time Data  

Microsoft Academic Search

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

P. Miller

2006-01-01

18

Real-time flutter identification  

NASA Technical Reports Server (NTRS)

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

Roy, R.; Walker, R.

1985-01-01

19

Real-time software receiver  

NASA Technical Reports Server (NTRS)

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

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

2006-01-01

20

Real-time software receiver  

NASA Technical Reports Server (NTRS)

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

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

2007-01-01

21

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

22

Real Time is Really Simple  

Microsoft Academic Search

It is easy to write and verify real-time specifications with existing languages and methods; one just represents time as an ordinaryvariable. The resulting specifications can be verified with ordinary model checkers. This basic idea and some less obvious details are explained with simple examples.

Leslie Lamport

2005-01-01

23

Real time radon variation indoors  

Microsoft Academic Search

Real-time indoor radon measurements have been performed in a controlled laboratory located 36 km from Mexico City at 3000 m altitude where experimental radon chambers exist. Radon was evaluated with an ALPHAGUARD equipment above installed at 2 m height from the floor, during a period of two years. Temperature and relative humidity were also recorded. The measuring time was programmed

A. Chávez; N. Segovia

2002-01-01

24

REAL TIME SYSTEM OPERATIONS 2006-2007  

E-print Network

system?wide voltage performance in the real?time  operating real?time information about actual safe  operating margins so that they can better manage the  system operating  system.     This time series data along with real?

Eto, Joseph H.

2008-01-01

25

POSIX real-time extensions  

NASA Technical Reports Server (NTRS)

POSIX is an evolving set of operating system interface standards, whose parts are in varying stages of production in a number of standards working groups. This presentation separates the real-time POSIX standards work in process from the rest and provides an overview of the purpose, status, dependencies, content, and project schedule of each.

Robbins, Henry H.

1992-01-01

26

Real-time nonphotorealistic rendering  

Microsoft Academic Search

Nonphotorealistic rendering (NPR) can help make comprehensible but simple pictures of complicated objects by employing an econ- omy of line. But current nonphotorealistic rendering is primarily a batch process. This paper presents a real-time nonphotorealistic renderer that deliberately trades accuracy and detail for speed. Our renderer uses a method for determining visible lines and surfaces which is a modification of

Lee Markosian; Michael A. Kowalski; Daniel Goldstein; Samuel J. Trychin; John F. Hughes; Lubomir D. Bourdev

1997-01-01

27

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

28

Clinical virology in real time  

Microsoft Academic Search

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

Hubert G. M Niesters

2002-01-01

29

Real Time Data System (RTDS)  

NASA Technical Reports Server (NTRS)

Information is given in viewgraph form on the Real Time Data System (RTDS). Topics covered include applications to the Space Station Freedom, the Space Shuttle flight controllers, the Mission Control Center workstations, and the Remote Manipulator Systems (RMS). Also covered are the technology gap, pacing factors, and lessons learned during research.

Heindel, Troy A.

1991-01-01

30

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

31

Real-time Energy Control  

Microsoft Academic Search

Today's energy control c enters must meet ever-increasing r eal-time demands. Rising fuel costs and the operation of power systems closer to operating constraints are motivating dispatchers to continuously s earch for t he best o perational balance of economics and security. Nine modern centers design- ed to meet these increased real-time demands are surveyed. The major elements of a

J. N. Boucher

1979-01-01

32

Real Time Data Analysis Techniques  

NASA Astrophysics Data System (ADS)

By the early 1970s, classical photo-optical range instrumentation technology (as a means of gathering weapons' system performance data) had become a costly and inefficient process. Film costs were increasing due to soaring silver prices. Time required to process, read, and produce optical data was becoming unacceptable as a means of supporting weapon system development programs. NWC investigated the feasibility of utilizing Closed Circuit Television (CCTV) technology as an alternative solution for providing optical data. In 1978 a program entitled Metric Video (measurements from video images) was formulated at the Naval Weapons Center, China Lake, California. The purpose of this program was to provide timely data, to reduce the number of operating personnel, and to lower data acquisition costs. Some of the task elements for this program included a near real-time vector miss-distance system, a weapons scoring system, a velocity measuring system, a time-space position system, and a system to replace film cameras for gathering real-time engineering sequential data. These task elements and the development of special hardware and techniques to achieve real-time data will be discussed briefly in this paper.

Silberberg, George G.

1983-03-01

33

Real Time Pyramid Transform Architecture  

NASA Astrophysics Data System (ADS)

This paper describes an architecture for creating pyramid transforms of real time video images. A powerful preprocessor can be designed with this architecture by representing the image data in a form most suitable for the application. The Burt pyramid algorithm [1], an efficient method for transforming video images into hierarchical representation, is an example of an effective transform. A programmable version of such a preprocessor, occupying two Multibus* boards, was built at low cost using available hardware. This unit can perform the basic pyramid trans-form on 256 x 240 images in real time. More complex and/or multiple transforms can be performed at reduced data rate by passing data through the unit several times, or can be performed in real time by passing data through multiple units. Because the preprocessor is programmable, the system is easily configured to perform several different pyramid transforms, or the appropriate inverse transforms. Algorithms can be developed to reduce edge effects by modifying the edges of the image before applying the transform. The preprocessor can be programmed to insert time delays into the system, which is useful in the display of the results. Image processing system, design can be simplified by using the preprocessor to significantly reduce the computational requirements of the main processor. The proposed architecture, suitable for system integration, could lead to the availability of low cost, efficient image processing systems.

van der Wal, Gooitzen S.; Sinniger, Joseph O...

1985-12-01

34

Faraday's Law  

NSDL National Science Digital Library

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

2008-11-05

35

Faraday Cage  

NSDL National Science Digital Library

This video, from the University of Bonn, provides a demonstration of the properties of a Faraday cage, an enclosure formed by a conducting material. A person inside the cage is shown to be protected from the 100,000 volts of electricity as the metal mesh dissipates the applied electric field.

2008-03-15

36

[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

37

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

38

Real-time optical correlation.  

PubMed

A real-time coherent optical correlator is described that uses the Itek PROM as a recyclable filter recording medium. Operation of a joint transform correlator is compared to a conventional Vander Lugt system. Experimental results are shown for the joint transform system, including demonstrations of the effects of target alignment and scale and the correlation of random bit rasters for signal processing applications. PMID:20155072

Nisenson, P; Sprague, R A

1975-11-01

39

The VLT Real Time Display  

NASA Astrophysics Data System (ADS)

The VLT Real-Time Display (RTD) software was developed in order to support image display in real-time, providing a tool for users to display video like images from a camera or detector as fast as possible on an X-Server. The RTD software is implemented as a package providing a Tcl/Tk image widget written in C++ and an independent image handling library and can be used as a building block, adding display capabilities to dedicated VLT control applications. The RTD widget provides basic image display functionality like: panning, zooming, color scaling, colormaps, intensity changes, pixel query, overlaying of line graphics. A large set of assisting widgets, e.g., colorbar, zoom window, spectrum plot are provided to enable the building of image applications. The support for real-time is provided by an RTD image event mechanism used for camera or detector subsystems to pass images to the RTD widget. Image data are passed efficiently via shared memory. This paper describes the architecture of the RTD software and summarizes the features provided by RTD.

Herlin, T.; Brighton, A.; Biereichel, P.

40

Replicating Real-Time Garbage Collector  

E-print Network

platform for real-time applications, bringing new challenges to a garbage collector. A real-time collector access to shared variables. 1. Introduction Java is on the rise as a platform for real-time applications, 1, 2, 23], and real-time Java has been used to implement applications in avionics [3], shipboard

Kent, University of

41

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. The agent needs to be able to fall back on an ability to construct plans at run time under time constraints. This thesis presents a method for planning at 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. The method has been implemented, and experiments have been run to validate the overall approach and the theoretical model.

Washington, Richard

1994-01-01

42

PROTECTING INFRASTRUCTURE ASSETS FROM REAL-TIME  

E-print Network

systems with current operating systems, at least with regard to real-time availability and run-time 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

43

Real-time structural modeling  

SciTech Connect

This paper describes a 2-D seismic modeling software program that is fast, accurate, user-friendly, and easy to understand. The program produces a depth-velocity model that has a synthetic time response that is compatible with the real seismic data: as the interpreter draws a boundary in depth, the computer instantaneously overlays that boundary's synthetic time response on the unmigrated seismic interpretation. By watching the overlay, instantaneous adjustments can be made so that obtaining a perfect match becomes a hand-eye coordination task. Any portion of the overlay display can be enlarged to obtain greater accuracy. Boundaries can be erased and redrawn until a satisfactory match is achieved. This program allows one to do in an hour what it takes a day to weeks to do with conventional modeling programs. The resulting velocity model (depth cross section) can then be used to depth-migrate the seismic section to obtain more detail. The use of this program is demonstrated for a synthetic data example. A synopsis of the algorithm is presented and limitations of the program are discussed. The oral presentation will include a real-data example and an example of the program's option to model migrated seismic data.

Johnson, J.H.; Wagenhofer, P.J.

1987-05-01

44

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

45

Real-time flood forecasting  

USGS Publications Warehouse

Researchers at the Hydroinformatic Research and Development Team (HIRDT) of the National Taiwan University undertook a project to create a real time flood forecasting model, with an aim to predict the current in the Tamsui River Basin. The model was designed based on deterministic approach with mathematic modeling of complex phenomenon, and specific parameter values operated to produce a discrete result. The project also devised a rainfall-stage model that relates the rate of rainfall upland directly to the change of the state of river, and is further related to another typhoon-rainfall model. The geographic information system (GIS) data, based on precise contour model of the terrain, estimate the regions that were perilous to flooding. The HIRDT, in response to the project's progress, also devoted their application of a deterministic model to unsteady flow of thermodynamics to help predict river authorities issue timely warnings and take other emergency measures.

Lai, C.; Tsay, T.-K.; Chien, C.-H.; Wu, I.-L.

2009-01-01

46

Faraday instability and Faraday patterns in a superfluid Fermi gas  

NASA Astrophysics Data System (ADS)

With the consideration of the coupling between the transverse width and the longitudinal density, the parametric excitations related to Faraday waves in a cigar-shaped superfluid Fermi gas are studied. A Mathieu equation is obtained, and it is demonstrated firstly that the excited actual 3D Faraday pattern is the combination of the longitudinal Faraday density wave and the corresponding transverse width fluctuation in the longitudinal direction. The Faraday instability growth index and the kinematic equations of the Faraday density wave and the width fluctuation along the Bose-Einstein condensate (BEC)-Bardeen-Cooper-Schrieffer (BCS) crossover are also given for the first time. It is found that the 3D Faraday pattern presents quite different behaviours (such as the excitations and the motions) when the system crosses from the BEC side to the BCS side. The coupling not only plays an important role in the parametric excitation, but also determines the dominant wavelength of the spatial structure. Along the crossover, the coupling effects are more significant in the BCS side. The final numerical investigation verifies these results and gives a detailed study of the parametric excitations (i.e. Faraday instability) and the 3D pattern formation.

Tang, Rong-An; Li, Hao-Cai; Xue, Ju-Kui

2011-06-01

47

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

48

Autonomous Real Time Requirements Tracing  

NASA Technical Reports Server (NTRS)

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

Plattsmier, George I.; Stetson, Howard K.

2014-01-01

49

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

50

REAL TIME IDENTIFICATION OF DELAY Lotfi Belkoura  

E-print Network

REAL TIME IDENTIFICATION OF DELAY SYSTEMS Lotfi Belkoura , Jean-Pierre Richard and Michel Fliess deals with real time and possibly closed loop identification of delay systems. It is based on non are provided. Keywords: Delay systems, Closed loop Identification. 1. INTRODUCTION The real time delay

Boyer, Edmond

51

A Component Framework for Real-time  

E-print Network

Checking #12;5 Scope of the Talk A Component Framework for Java-based Real-time Distributed Embedded1 A Component Framework for Real-time Java 12.11.2008 DSRG Prague, Czech Republic Ales Plsek, ales, INRIA ADAM · Research Interests ­ Component-Oriented Programming ­ Real-time Java Programming ­ Model

52

Real Time Scheduling Theory: A Historical Perspective  

Microsoft Academic Search

In this 25th year anniversary paper for the IEEE Real Time Systems Symposium, we review the key results in real time scheduling theory and the his- torical events that led to the establishment of the current real time computing infrastructure. We conclude this paper by looking at the challenges ahead of us.

Lui Sha; Tarek F. Abdelzaher; Karl-erik Årzén; Anton Cervin; Theodore P. Baker; Alan Burns; Giorgio C. Buttazzo; Marco Caccamo; John P. Lehoczky; Aloysius K. Mok

2004-01-01

53

Real-time metabolic imaging  

NASA Astrophysics Data System (ADS)

The endogenous substance pyruvate is of major importance to maintain energy homeostasis in the cells and provides a window to several important metabolic processes essential to cell survival. Cell viability is therefore reflected in the metabolism of pyruvate. NMR spectroscopy has until now been the only noninvasive method to gain insight into the fate of pyruvate in the body, but the low NMR sensitivity even at high field strength has only allowed information about steady-state conditions. The medically relevant information about the distribution, localization, and metabolic rate of the substance during the first minute after the injection has not been obtainable. Use of a hyperpolarization technique has enabled 10-15% polarization of 13C1 in up to a 0.3 M pyruvate solution. i.v. injection of the solution into rats and pigs allows imaging of the distribution of pyruvate and mapping of its major metabolites lactate and alanine within a time frame of 10 s. Real-time molecular imaging with MRI has become a reality. 13C | dynamic nuclear polarization | hyperpolarized | MRI | spectroscopy

Golman, Klaes; in 't Zandt, René; Thaning, Mikkel

2006-07-01

54

Manage costs in real time  

SciTech Connect

Executives and managers generally have volume-based goals for production. Yet the business ultimately succeeds or fails based on profitability, not throughput. To manage profitability in real time, costs must be correctly identified, measured and allocated. Traditional financial reports were not necessarily developed to manage operations. Their methods of construction and disconnected timing from contributory events make them ineffective for this purpose. However, these reports are often the primary tools given to operations for evaluating cost behavior and profitability. Reports that evaluate financial performance are typically produced weeks after the fact, presenting overall bottom-line results for multiple products with no clear information regarding contributory events. Therefore, precise action to improve results is difficult. This raises the question whether there is true accountability or responsibility for costs when there is such limited specific information provided. The evolution of process measurements and distributed control systems, and the arrival of computers at the plant level, create the opportunity to link all the information necessary to calculate variable manufacturing costs, fully burdened costs, profit by product and profit by customer. Through the linking of business systems, process control systems and cost models, it is possible to calculate these costs while the product is still in the production cycle. Variances from target can be reported before losses. The following case history demonstrates ways that RTCM can be applied to a process environment and to the strategic management of the business.

Dragoo, R.E.; Letendre, R.A. (Ernst and Young, Houston, TX (United States))

1993-07-01

55

Real-Time Data Display  

NASA Technical Reports Server (NTRS)

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

Pedings, Marc

2007-01-01

56

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

57

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

58

Static Real-Time Data Distribution  

Microsoft Academic Search

This paper describes the design and implementation of a static real-time data distribution mechanism that u ses a real-time event service and a real-time scheduling service to ensure the on-time, and temporally valid deliver y of data. The mechanism implements an algorithm, calle d the Just-In-Time Data Distribution algorithm to determi ne scheduling parameters that will ensure that data th

Angela Uvarov; Lisa Cingiser Dipippo; Victor Fay-Wolfe; Kevin Bryan; Patrick Gadrow; Timothy Henry; Matthew Murphy; Paul R. Work; Louis P. Dipalma

2004-01-01

59

A Real Time Operating System Survey What the heck is a Real Time system  

E-print Network

A Real Time Operating System Survey John Ford 1 #12; What the heck is a Real Time system anyway Operating System) has to have a real­time kernel ffl Good documentation ffl Good device support ffl Good) 14 #12; uCOS -- MicroComputer Operating System ffl Real time kernel only ffl Runs on many micros

Groppi, Christopher

60

Real-time optical associative retrieval technique  

NASA Technical Reports Server (NTRS)

A real-time optical associative retrieval technique is presented. The associative retrieval model enables a large amount of data to be stored and recalled by partial information optically in real time. The real-time capability is achieved by using an electronically addressed spatial light modulator based on the pocket-size liquid crystal display television. The potential application of the technique to the perceptive vision requirements in telerobotics for achieving NASA's goals of automation in space is described.

Liu, H.-K.; Kung, S. Y.; Davis, J. A.

1986-01-01

61

Real-time scheduling on multithreaded processors  

Microsoft Academic Search

This paper investigates real-time scheduling algorithms on upcoming multithreaded processors. As evaluation testbed we introduce a multithreaded processor kernel which is specifically designed as core processor of a micro- controller or system-on-a-chip. Handling of external real- time events is performed through multithreading. Real-time threads are used as interrupt service threads (ISTs) instead of interrupt service routines (ISRs). Our proposed micro-

Jochen Kreuzinger; A. Schulz; Matthias Pfeffer; Theo Ungerer; Uwe Brinkschulte; C. Krakowski

2000-01-01

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

ACCURATE REAL-TIME WINDOWED TIME WARPING Robert Macrae  

E-print Network

ACCURATE REAL-TIME WINDOWED TIME WARPING Robert Macrae Centre for Digital Music robert.macrae@elec.qmul.ac.uk Simon Dixon Centre for Digital Music simon.dixon@elec.qmul.ac.uk ABSTRACT Dynamic Time Warping (DTW in advance and has quadratic time and space requirements. As such DTW is unsuitable for real-time

Dixon, Simon

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

Towards real-time business intelligence  

Microsoft Academic Search

Analysing data to predict market trends of products and services and to improve performances of enterprise business systems has always been part of running a competitive business. But it is becoming essential nowadays that not only is the analysis done on real-time data, but also actions in response to analysis results can be performed in real time and instantaneously change

B. Azvine; Z. Cui; D. D. Nauck

2005-01-01

66

Real-Time Enhancements for Embedded Linux  

Microsoft Academic Search

With the popularity of using Linux for embedded systems, its real-time performance is increasingly becoming an importance issue for applications that require short latency and task execution predictability as commonly encountered in many embedded systems. This paper presents a survey of the approaches used by commercial vendors and open source community to enhance the real-time performance of the Linux kernel.

N. Vun; H. F. Hor; J. W. Chao

2008-01-01

67

Robust Real-Time Applications in Timber  

Microsoft Academic Search

Embedded systems are often operating under hard real-time constraints, for example in automotive applications. For such systems, robustness and reliability are crucial, which calls for rigorous system design and methodologies for validation. In this paper we advocate a design methodology for robust, real-time systems, based on Timber; a pure reactive system model that allows for formal reasoning about various system

P. Lindgren; J. Nordlander; M. Kero; J. Eriksson

2006-01-01

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

Active Faraday optical frequency standards  

E-print Network

We propose the mechanism of active Faraday optical clock, and experimentally demonstrate active Faraday optical frequency standards based on 852 nm narrow bandwidth Faraday atomic filter by the method of velocity-selective optical pumping of cesium vapor. The center frequency of the active Faraday optical frequency standards is determined by the cesium 6 $^{2}S_{1/2}$ $F$ = 4 to 6 $^{2}P_{3/2}$ $F'$ = 4 and 5 crossover transition line. The optical heterodyne beat between two similar independent setups shows that the frequency linewidth reaches 996(26) Hz, which is 5.3 $\\times$ 10$^{3}$ times smaller than the natural linewidth of the cesium 852 nm transition line. The maximum emitted light power reaches 75 $\\upmu$W. The active Faraday optical frequency standards reported here have advantages of narrow linewidth and reduced cavity pulling, which can readily be extended to other atomic transition lines of alkali and alkaline-earth metal atoms trapped in optical lattices at magic wavelengths, making it useful for...

Zhuang, Wei

2014-01-01

70

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

71

Active Faraday optical frequency standard.  

PubMed

We propose the mechanism of an active Faraday optical clock, and experimentally demonstrate an active Faraday optical frequency standard based on narrow bandwidth Faraday atomic filter by the method of velocity-selective optical pumping of cesium vapor. The center frequency of the active Faraday optical frequency standard is determined by the cesium 6 S1/22F=4 to 6 P3/22F'=4 and 5 crossover transition line. The optical heterodyne beat between two similar independent setups shows that the frequency linewidth reaches 281(23) Hz, which is 1.9×104 times smaller than the natural linewidth of the cesium 852-nm transition line. The maximum emitted light power reaches 75 ?W. The active Faraday optical frequency standard reported here has advantages of narrow linewidth and reduced cavity pulling, which can readily be extended to other atomic transition lines of alkali and alkaline-earth metal atoms trapped in optical lattices at magic wavelengths, making it useful for new generation of optical atomic clocks. PMID:25361349

Zhuang, Wei; Chen, Jingbiao

2014-11-01

72

Achieving real-time performance in FIESTA  

NASA Technical Reports Server (NTRS)

The Fault Isolation Expert System for TDRSS Applications (FIESTA) is targeted for operation in a real-time online environment. Initial stages of the prototype development concentrated on acquisition and representation of the knowledge necessary to isolate faults in the TDRSS Network. Recent efforts focused on achieving real-time performance including: a discussion of the meaning of FIESTA real-time requirements, determination of performance levels (benchmarking) and techniques for optimization. Optimization techniques presented include redesign of critical relations, filtering of redundant data and optimization of patterns used in rules. Results are summarized.

Wilkinson, William; Happell, Nadine; Miksell, Steve; Quillin, Robert; Carlisle, Candace

1988-01-01

73

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

74

Real time sensor for therapeutic radiation delivery  

DOEpatents

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

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

1998-01-01

75

Real-time blocking system for MMS  

NASA Astrophysics Data System (ADS)

With the fast development of Multimedia Message Service (MMS), MMS has penetrated people"s life as an important way for real-time communication of message. Clients use the service everyday to make, send and transmit huge amount of real-time multimedia messages. Usually the filtering application can block messages by lists of addresses (Black/White list) or use traditional Text/Keyword filtering methods. We propose a new filtering scheme by using content-based image analysis technology, which can help filter trash messages in MMS, while the route scheme is adapted for the goal of content-based real-time blocking system.

Wang, Donghui; Zhu, Miaoliang; Wu, Zheng; Gong, Jianjun

2004-03-01

76

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

77

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

78

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); Joyce J. Repa (University of Texas Southwestern Medical Center Department of Internal Medicine,Touchstone Center for Diabetes Research,)

2005-09-01

79

High energy real-time imaging studies.  

National Technical Information Service (NTIS)

Performance characteristics of high energy real-time radiography (RTR) systems were optimized by interchanging components and varying optical coupling methods. Phosphor screens, fiber optic scintillation plates, monolithic high density glass scintillation...

J. J. Haskins, K. W. Dolan, D. E. Perkins, D. Rikard, D. J. Schneberk

1993-01-01

80

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

81

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

82

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

83

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

84

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

85

Real-time recorder and display  

Microsoft Academic Search

The Itek Real-Time Recorder and Display (RTRD) performs real-time display and recording of very wide field images. The storage medium is an archival-quality, inert, metal-on-plastic material that requires no processing and is unaffected by light or environmental extremes either before or after exposure. The system is ideally suited for applications where quick access, permanent hard copy is desired. Electro-optical visible

A. A. Atkins; P. W. Ford; R. E. Williamson

1978-01-01

86

Pervasive real-time biomedical monitoring system  

Microsoft Academic Search

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

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

2009-01-01

87

Using Linux for Real-Time Applications  

Microsoft Academic Search

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

Armand Marchesin

2004-01-01

88

Real-time fired heater simulator  

SciTech Connect

The microcomputer based real-time dynamic process simulator is a relatively new concept. Its primary use is for training of operators and engineers. By completely duplicating the actual plant functional response, it lets one see how the 'real thing' works instead of texts and printouts. The simulator may be used for fine tuning the controllers and studying the stability of the furnace operation. It can also be used for optimization of a furnace, resulting in economic gains. The simulator was written using FORTRAN and can be easily installed on any small computer with real-time operating system and graphics capability.

Gokhale, A.V.

1987-01-01

89

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

90

Incremental Verification of Timing Constraints for Real-Time Systems  

E-print Network

Testing constraints for real-time systems are usually verified through the satisfiability of propositional formulae. In this paper, we propose an alternative where the verification of timing constraints can be done by ...

Andrei, Åž tefan

91

Real-time GPS monitoring throughout Cascadia  

NASA Astrophysics Data System (ADS)

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

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

2012-12-01

92

REAL TIME SYSTEM OPERATIONS 2006-2007  

SciTech Connect

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

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

2008-08-15

93

Elapsed Time in the Real World  

NSDL National Science Digital Library

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

Service, National S.

2009-04-24

94

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

95

Real-time PCR in virology  

PubMed Central

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 laboratory. Real-time PCR has engendered wider acceptance of the PCR due to its improved rapidity, sensitivity, reproducibility and the reduced risk of carry-over contamination. There are currently five main chemistries used for the detection of PCR product during real-time PCR. These are the DNA binding fluorophores, the 5? endonuclease, adjacent linear and hairpin oligoprobes and the self-fluorescing amplicons, which are described in detail. We also discuss factors that have restricted the development of multiplex real-time PCR as well as the role of real-time PCR in quantitating nucleic acids. Both amplification hardware and the fluorogenic detection chemistries have evolved rapidly as the understanding of real-time PCR has developed and this review aims to update the scientist on the current state of the art. We describe the background, advantages and limitations of real-time PCR and we review the literature as it applies to virus detection in the routine and research laboratory in order to focus on one of the many areas in which the application of real-time PCR has provided significant methodological benefits and improved patient outcomes. However, the technology discussed has been applied to other areas of microbiology as well as studies of gene expression and genetic disease. PMID:11884626

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

2002-01-01

96

Real-time gauge/gravity duality.  

PubMed

We present a general prescription for the holographic computation of real-time n-point functions in nontrivial states. In quantum field theory such real-time computations involve a choice of a time contour in the complex time plane. The holographic prescription amounts to "filling in" this contour with bulk solutions: real segments of the contour are filled in with Lorentzian solutions while imaginary segments are filled in with Riemannian solutions and appropriate matching conditions are imposed at the corners of the contour. We illustrate the general discussion by computing the 2-point function of a scalar operator using this prescription and by showing that this leads to an unambiguous answer with the correct iE insertions. PMID:18764600

Skenderis, Kostas; van Rees, Balt C

2008-08-22

97

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

98

Visualization of Real-Time Data  

NASA Technical Reports Server (NTRS)

In this project we explored various approaches to presenting real-time data from the numerous systems monitored on the space shuttle to computer users. We examined the approach that several projects at the Kennedy Space Center (KSC) used to accomplish this. We undertook to build a prototype system to demonstrate that the Internet and the Java programming language could be used to present the real-time data conveniently. Several Java programs were developed that presented real-time data in different forms including one form that emulated the display screens of the PC GOAL system which is familiar to many at KSC. Also, we developed several communications programs to supply the data continuously. Furthermore, a framework was created using the World Wide Web (WWW) to organize the collection and presentation of the real-time data. We believe our demonstration project shows the great flexibility of the approach. We had no particular use of the data in mind, instead we wanted the most general and the least complex framework possible. People who wish to view data need only know how to use a WWW browser and the address (the URL). People wanting to build WWW documents containing real-time data need only know the values of a few parameters, they do not need to program in Java or any other language. These are stunning advantages over more monolithic systems.

Stansifer, Ryan; Engrand, Peter

1996-01-01

99

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

100

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

101

Java and Real Time Storage Applications  

Microsoft Academic Search

Storage systems have storage devices which run real time embedded software. Most storage devices use C and occasionally C++ to manage and control the storage device. Software for the storage device must meet the time and resource constraints of the storage device. The prevailing wisdom in the embedded world is that objects and in particular Java only work for simple

Gary Mueller; Janet Borzuchowski

2002-01-01

102

Syncopation: Generational Real-time Garbage Collection  

E-print Network

Syncopation: Generational Real-time Garbage Collection in the Metronome David F. Bacon IBM Research. Syncopation allows such behavior to be detected by the scheduler in time for allocation to by-pass the nursery of application behavior which show that while syncopation is neces- sary, the need for it is rare enough

Grove, David

103

Real time earthquake forecasting in Italy  

Microsoft Academic Search

We have applied an earthquake clustering epidemic model to real time data at the Italian Earthquake Data Center operated by the Istituto Nazionale di Geofisica e Vulcanologia (INGV) for short-term forecasting of moderate and large earthquakes in Italy. In this epidemic-type model every earthquake is regarded, at the same time, as being triggered by previous events and triggering following earthquakes.

M. Murru; R. Console; G. Falcone

2009-01-01

104

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

105

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

106

Continuous, real time microwave plasma element sensor  

DOEpatents

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

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

1995-01-01

107

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

108

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

109

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

110

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

111

Advances in real-time control algorithms  

NASA Astrophysics Data System (ADS)

Since the early days, many aspects of Adaptive Optics (AO) have seen tremendous changes. From the early experimental systems providing low order correction in a tiny patch of sky to todays fully automated specialized system offering correction in a much wider field and/or a much higher degree of correction, the evolution has been remarkable. For example, deformable mirror (DM) technology and wavefront sensing methods have been constantly improved. As well, real-time control algorithms have been greatly refined. This paper will review the different real-time control strategies that have been used with astronomical adaptive optics. They all have in common the same objective, that is the derivation of an optimal command for the deformable mirror(s) in order to get the least amount of residual optical aberrations in the science path. Most of the time, the real-time control algorithm is split in two independent components, the first part performing the wavefront (spatial) reconstruction, the second part performing the temporal control. With the advent of the extremely large telescopes (ELTs), as well as new AO modalities requiring several DMs and wavefront sensors, performing both these tasks in an ever shrinking glimpse of time is even more challenging. We will describe advanced fast and iterative reconstruction methods recently proposed for next generation AO systems. We will show how these algorithms combined with sparse matrices and parallel computing techniques meet the requirements of Extremely Large Telescope (ELT) real time computers.

Conan, Rodolphe; Veran, Jean-Pierre

2010-07-01

112

Note: Real-time absolute air refractometer.  

PubMed

We present a real-time absolute air refractometer benefiting from the synthetic pseudo-wavelength (SPW) method. Based on laser heterodyne interferometry, the SPW method uses three vacuum cells with specific lengths to synthesize a set of synthetic pseudo-wavelengths, by combination of which the refractive index can be determined directly without ambiguity. In addition, owing to the parallel arrangement of the vacuum cells in the optical path, the measured data can be collected simultaneously so that one measurement process can be less than 2 ms. The real-time feature makes it possible for instantaneous compensation for laser interferometers. PMID:24880432

Huang, Pei; Zhang, Jitao; Li, Yan; Wei, Haoyun

2014-05-01

113

Automated real-time software development  

NASA Technical Reports Server (NTRS)

A Computer-Aided Software Engineering (CASE) system has been developed at the Charles Stark Draper Laboratory (CSDL) under the direction of the NASA Langley Research Center. The CSDL CASE tool provides an automated method of generating source code and hard copy documentation from functional application engineering specifications. The goal is to significantly reduce the cost of developing and maintaining real-time scientific and engineering software while increasing system reliability. This paper describes CSDL CASE and discusses demonstrations that used the tool to automatically generate real-time application code.

Jones, Denise R.; Walker, Carrie K.; Turkovich, John J.

1993-01-01

114

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

115

Software Package For Real-Time Graphics  

NASA Technical Reports Server (NTRS)

Software package for master graphics interactive console (MAGIC) at Western Aeronautical Test Range (WATR) of NASA Ames Research Center provides general-purpose graphical display system for real-time and post-real-time analysis of data. Written in C language and intended for use on workstation of interactive raster imaging system (IRIS) equipped with level-V Unix operating system. Enables flight researchers to create their own displays on basis of individual requirements. Applicable to monitoring of complicated processes in chemical industry.

Malone, Jacqueline C.; Moore, Archie L.

1991-01-01

116

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

117

Real time network modulation for intractable epilepsy Behnaam Aazhang  

E-print Network

Real time network modulation for intractable epilepsy Behnaam Aazhang ! Electrical and Computer;Real time network modulation for intractable epilepsy Behnaam Aazhang ! Electrical and Computer;Real time network modulation for intractable epilepsy Behnaam Aazhang ! Electrical and Computer

Aazhang, Behnaam

118

Comparing Caching Techniques for Multitasking RealTime Systems  

E-print Network

. Real­time operating systems need to know the timing behavior of applications to ensure correct real constraint, or deadline, can result in a catastrophic failure. The real­time operating system (RTOS) must

Massachusetts at Amherst, University of

119

Real-time closed-world tracking  

Microsoft Academic Search

A real-time tracking algorithm that uses contextual in- formation is described. The method is capable of simul- taneously tracking multiple, non-rigid objects when erratic movement and object collisions are common. A closed- world assumption is used to adaptively select and weight image features used for correspondence. Results of algo- rithm testing and the limitationsof the method are discussed. The algorithm

Stephen S. Intille; James W. Davis; Aaron F. Bobick

1997-01-01

120

Real-time control over networks  

E-print Network

issues regarding control over networks and can be the guidelines of NCS design. A single actuator ball magnetic-levitation (maglev) system is implemented as a test bed for the real-time control over networks to illustrate and verify the theoretical...

Ji, Kun

2007-09-17

121

Real-Time Nonequilibrium Green's Functions  

NASA Astrophysics Data System (ADS)

A brief review of early Russian works on the Green's functions applications to many body theory, particularly for nonequilibrium states and processes, is presented. Discussed are some general features and relations of the real-time Nonequilibrium Green's function (NGF) matrices method to some other approaches.

Keldysh, L. V.

2003-04-01

122

Visualizing Crowds in Real-Time  

Microsoft Academic Search

Real-time crowd visualization has recently attracted quite an interest from the graphics community and, as in- teractive applications become even more complex, there is a natural demand of new and unexplored application scenarios. However, the interactive simulation of complex environments populated by large numbers of virtual characters is a composite problem which poses serious difculties even on modern computer hardware.

Franco Tecchia; Celine Loscos; Yiorgos Chrysanthou

2002-01-01

123

Real-time sensor data validation  

Microsoft Academic Search

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

Timothy W. Bickmore

1994-01-01

124

Development of real-time photoacoustic microscopy  

Microsoft Academic Search

Photoacoustic tomography detecting ultrasound signals generated from photon absorption provides optical absorption contrast in vivo for structural, functional and molecular imaging. Although photoacoustic tomography technology has grown fast in recent years, real-time photoacoustic imaging with cellular spatial resolution are still strongly demanded. We developed a photoacoustic microscopy which has video-rate imaging capability with cellular spatial resolution. The system consists of

Lidai Wang; Konstantin Maslov; Junjie Yao; Li Li; Lihong V. Wang

2011-01-01

125

REal-time COsmic Ray Database (RECORD)  

Microsoft Academic Search

In this paper we present a first distributed REal-time COsmic Ray Database (RECORD). The aim of the project is to develop a unified database with data from different neutron monitors collected together, in unified format and to provide a user with several commonly used data access methods. The database contains not only original cosmic ray data but also auxiliary data

I. Usoskin; Valery Kozlov; Sergei Starodubtsev; Alexey Turpanov; Victor Yanke

2003-01-01

126

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 ...

127

Real-Time Omnidirectional Image Sensors  

Microsoft Academic Search

Conventional T.V. cameras are limited in their field of view. A real-time omnidirectional camera which can acquire an omnidirectional (360 degrees) field of view at video rate and which could be applied in a variety of fields, such as autonomous navigation, telepresence, virtual reality and remote monitoring, is presented. We have developed three different types of omnidirectional image sensors, and

Yasushi Yagi; Masahiko Yachida

2004-01-01

128

Real-time defect detection on cloths  

Microsoft Academic Search

The detection and classification of defects is strongly useful for stopping in real time the cloth production when degenerative defects occur; for increasing the efficiency of production by limiting the decrement of price for cloth rolls. The paper describes the work performed for detecting defect of well-known manufacturers of cloths and machine builders for cloths (looms). The main goal has

Antonio Baldassarre; Maurizio de Lucia; Paolo Nesi; Francesca Rossi; Jacopo Zamberlan

1999-01-01

129

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

130

Approach to real-time holography  

Microsoft Academic Search

Holography which is used in 3-Dimensional data bases was investigated. In most cases the nearer to real time the hologram can be produced the more beneficial. Since a hologram is a superposition of Fresnel zone plate patterns from each point source in the object volume on to the image plane, a cellular array processor is suggested which will produce a

H. L. Davidson; S. S. Friedland

1983-01-01

131

Real time calculation for holographic video display  

Microsoft Academic Search

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

Takeshi Yamaguchi; Hiroshi Yoshikawa

2006-01-01

132

Spectral tracking of objects in real time  

Microsoft Academic Search

Advanced multispectral, or hyperspectral, camera systems are being used to identify objects of interest on the basis of spectral characteristics. This paper will describe developments in the field of a real time spectral matched filtering. Matched filtering relies on there being a measurable difference between the spectrum of the target and that of background materials such as soil, vegetation, concrete

Gary J. Bishop; Ainsley Killey; Matthew D. Porter; Adrian S. Blagg

2008-01-01

133

Real Time Grid Reliability Management 2005  

SciTech Connect

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

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

2008-07-07

134

Real-Time Earthquake Forecasting in Italy  

Microsoft Academic Search

We apply an earthquake clustering epidemic model to real-time data of the Italian Earthquake Data Center operated by the Istituto Nazionale di Geofisica e Vulcanologia since January 2006 for short-term moderate and large earthquakes forecasting in Italy based on smoothed seismicity. The forecast uses earthquake data only, with no explicit use of tectonic, geologic, or geodetic information. In this model

M. Murru; R. Console; G. Falcone

2006-01-01

135

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

136

Real-Time Adaptive A* Sven Koenig  

E-print Network

Intelligence]: Problem Solving, Control Methods, and Search--Graph and Tree Search Strategies General Terms to move smoothly and thus need to search in real time. In this paper, we describe a simple but powerful way of speeding up repeated A* searches with the same goal states, namely by updating the heuristics

Sukthankar, Gita Reese

137

HABE real-time image processing  

Microsoft Academic Search

The HABE system performs real-time autonomous acquisition, pointing and tracking (ATP). The goal of the experiment, sponsored by the Ballistic Missile Defense Organization and administered by the US Air Force Research Laboratory, Kirtland AFB, Albuquerque, NM, is to demonstrate the acquisition, tracking and pointing technologies needed for an effective space-based missile defense system. The three sensor tracking system includes two

Joseph C. Krainak

1999-01-01

138

Timed State Space Analysis of Real-Time Preemptive Systems  

Microsoft Academic Search

Abstract: A modeling notation is introduced which extends Time Petri Nets with anadditional mechanism of resource assignment which makes the progress of timedtransitions be dependent on the availability of a set of preemptable resources. Theresulting notation, which we call Preemptive Time Petri Nets, permits naturaldescription of complex real time systems running under preemptive scheduling,with periodic, sporadic and one-shot processes, with

Giacomo Bucci; Andrea Fedeli; Luigi Sassoli; Enrico Vicario

2004-01-01

139

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

140

The Real-Time Process Algebra (RTPA)  

Microsoft Academic Search

The real-time process algebra (RTPA) is a set of new mathematical notations for formally de- scribing system architectures, and static and dynamic behaviors. It is recognized that the specification of software behaviors is a three-dimensional problem known as: (i) mathematical operations, (ii) event\\/process timing, and (iii) memory manipulations. Conventional formal methods in software engineering were de- signed to describe the

Yingxu Wang

2002-01-01

141

Real-Time Streamflow Data via Satellite  

NSDL National Science Digital Library

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

142

Real Time Pricing and the Real Live Firm  

SciTech Connect

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

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

2004-05-26

143

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

144

Real time gamma-ray signature identifier  

DOEpatents

A real time gamma-ray signature/source identification method and system using principal components analysis (PCA) for transforming and substantially reducing one or more comprehensive spectral libraries of nuclear materials types and configurations into a corresponding concise representation/signature(s) representing and indexing each individual predetermined spectrum in principal component (PC) space, wherein an unknown gamma-ray signature may be compared against the representative signature to find a match or at least characterize the unknown signature from among all the entries in the library with a single regression or simple projection into the PC space, so as to substantially reduce processing time and computing resources and enable real-time characterization and/or identification.

Rowland, Mark (Alamo, CA); Gosnell, Tom B. (Moraga, CA); Ham, Cheryl (Livermore, CA); Perkins, Dwight (Livermore, CA); Wong, James (Dublin, CA)

2012-05-15

145

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

146

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

147

Incremental Verification of Timing Constraints for Real-Time Systems  

Microsoft Academic Search

Testing constraints for real-time systems are usually verified through the satisfiability of propositional formulae. In this paper, we propose an alternative where the verification of timing constraints can be done by counting the number of truth assignments instead of boolean satisfiability. This number can also tell us how \\

Stefan ANDREI; Wei-Ngan CHIN; Martin RINARD

148

Real-time interactive treatment planning.  

PubMed

The goal of this work is to develop an interactive treatment planning platform that permits real-time manipulation of dose distributions including DVHs and other dose metrics. The hypothesis underlying the approach proposed here is that the process of evaluating potential dose distribution options and deciding on the best clinical trade-offs may be separated from the derivation of the actual delivery parameters used for the patient's treatment. For this purpose a novel algorithm for deriving an Achievable Dose Estimate (ADE) was developed. The ADE algorithm is computationally efficient so as to update dose distributions in effectively real-time while accurately incorporating the limits of what can be achieved in practice. The resulting system is a software environment for interactive real-time manipulation of dose that permits the clinician to rapidly develop a fully customized 3D dose distribution. Graphical navigation of dose distributions is achieved by a sophisticated method of identifying contributing fluence elements, modifying those elements and re-computing the entire dose distribution. 3D dose distributions are calculated in ~2-20?ms. Including graphics processing overhead, clinicians may visually interact with the dose distribution (e.g. 'drag' a DVH) and display updates of the dose distribution at a rate of more than 20 times per second. Preliminary testing on various sites shows that interactive planning may be completed in ~1-5?min, depending on the complexity of the case (number of targets and OARs). Final DVHs are derived through a separate plan optimization step using a conventional VMAT planning system and were shown to be achievable within 2% and 4% in high and low dose regions respectively. With real-time interactive planning trade-offs between Target(s) and OARs may be evaluated efficiently providing a better understanding of the dosimetric options available to each patient in static or adaptive RT. PMID:25097184

Otto, Karl

2014-09-01

149

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

150

CIESE Real Time Data Projects: Tsunami Surge  

NSDL National Science Digital Library

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

2012-04-14

151

ARGUS: real-time UAV imaging system  

NASA Astrophysics Data System (ADS)

In January 1991, Teledyne Ryan Aeronautical embarked on a company funded, quick reaction program to develop a real-time reconnaissance kit which can be installed on existing BQM- 34A target aircraft. This kit was designed to provide real-time, day-night, reconnaissance video imagery to the battlefield commander in the field or to the airborne command post. This imagery is used to direct or redirect airborne strike aircraft using the latest targeting and bomb-damage assessment information available. This system uses low-cost, broadcast TV, recording, and data communications equipment technology readily available in either the commercial or military markets. The ARGUS system was subsequently demonstrated during Green Flag 92-5 at Nellis AFB, NV using two modified BQM-34A Firebee Target aircraft.

Hansen, Bertel J.; Sturz, Richard A.

1993-12-01

152

CRTF Real-Time Aperture Flux system  

SciTech Connect

The Real-Time Aperture Flux system (TRAF) is a test measurement system designed to determine the input power/unit area (flux density) during solar experiments conducted at the Central Receiver Test Facility, Sandia National Laboratories, Albuquerque, New Mexico. The RTAF is capable of using both thermal sensors and photon sensors to determine the flux densities in the RTAF measuring plane. These data are manipulated in various ways to derive input power and flux density distribution to solar experiments.

Davis, D.B.

1980-01-01

153

Multi-agent real-time pursuit  

Microsoft Academic Search

In this paper, we address the problem of multi-agent pursuit in dynamic and partially observable environments, modeled as\\u000a grid worlds; and present an algorithm called Multi-Agent Real-Time Pursuit (MAPS) for multiple predators to capture a moving\\u000a prey cooperatively. MAPS introduces two new coordination strategies namely Blocking Escape Directions and Using Alternative\\u000a Proposals, which help the predators waylay the possible escape

Cagatay Undeger; Faruk Polat

2010-01-01

154

Real time computer controlled weld skate  

NASA Technical Reports Server (NTRS)

A real time, adaptive control, automatic welding system was developed. This system utilizes the general case geometrical relationships between a weldment and a weld skate to precisely maintain constant weld speed and torch angle along a contoured workplace. The system is compatible with the gas tungsten arc weld process or can be adapted to other weld processes. Heli-arc cutting and machine tool routing operations are possible applications.

Wall, W. A., Jr.

1977-01-01

155

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

156

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

157

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.

158

Real-Time Strategy Game AI and More Michael Buro  

E-print Network

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

Buro, Michael

159

Quality of Service Support for Real-time Storage Systems  

E-print Network

real-time applications and classify their Quality of Service (QoS) requirements. We then survey scheduling, real-time storage, Linux. I. INTRODUCTION The performance and capacity of commodity computer sys system support for disk quality of service. A. Storage-bound Real-time Applications Traditional real-time

Rangaswami, Raju

160

Electric loads as Real-Time tasks: An application of Real-Time Physical Systems  

Microsoft Academic Search

This paper describes the application of Real-Time Physical Systems (RTPS) as a novel approach to model the physical process of Cyber-Physical Systems (CPS), with specific focus on Cyber-Physical Energy Systems (CPES). The proposed approach is based on the real-time scheduling theory which is nowadays developed to manage concurrent computing tasks on processing platforms. Therefore, the physical process is modeled in

Marco L. Della Vedova; Ettore Di Palma; Tullio Facchinetti

2011-01-01

161

Real-time optical fiber dosimeter probe  

NASA Astrophysics Data System (ADS)

There is a pressing need for a passive optical fiber dosimeter probe for use in real-time monitoring of radiation dose delivered to clinical radiation therapy patients. An optical fiber probe using radiochromic material has been designed and fabricated based on a thin film of the radiochromic material on a dielectric mirror. Measurements of the net optical density vs. time before, during, and after irradiation at a rate of 500cGy/minute to a total dose of 5 Gy were performed. Net optical densities increased from 0.2 to 2.0 for radiochromic thin film thicknesses of 2 to 20 ?m, respectively.

Croteau, André; Caron, Serge; Rink, Alexandra; Jaffray, David; Mermut, Ozzy

2011-03-01

162

Real-Time Rendering of Real-World Environments  

Microsoft Academic Search

One of the most important goals of interactive computer graphics is to allow a user to freely walk around a virtual recreation of a real environment that looks as real as the world around us. But hand-modeling such a virtual environment is inherently limited and acquiring the scene model using devices also presents challenges. Interactively rendering such a detailed model

David K. Mcallister; Lars S. Nyland; Voicu Popescu; Anselmo Lastra; Chris Mccue

1999-01-01

163

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

164

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

165

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

E-print Network

. Another point we focus in this thesis is real-time disk scheduling. Many disk algorithms of two be designed for real-time fault-tolerant application. A fault-tolerant disk scheduling is described1 Study of Real-time Scheduling Model and Real-time Scheduling Algorithms with Fault

Qin, Xiao

166

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

167

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

168

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

169

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

170

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

171

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

172

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

173

Real-time software failure characterization  

NASA Technical Reports Server (NTRS)

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

Dunham, Janet R.; Finelli, George B.

1990-01-01

174

Real time orbit determination during apogee maneuvers  

NASA Astrophysics Data System (ADS)

The use of bi-propellant thrusters, of low thrust level, for apogee boost maneuvers to determine, in real time during the thrust, the instantaneously obtained orbits is described. The accuracy of the orbit determination is sufficient to predict the optimum date of the cut off of the thruster, in order to minimize errors due to the thrust inaccuracy. The expected accuracy of such a procedure could simplify greatly the station acquisition phase, by shorter station acquisition duration; and all the maneuvers could be achieved in sight of the same stations, so the number of necessary stations could be reduced.

Belon, B.

175

Low cost real time interactive analysis system  

NASA Technical Reports Server (NTRS)

Efforts continue to develop a low cost real time interactive analysis system for the reception of satellite data. A multi-purpose ingest hardware software frame formatter was demonstrated for GOES and TIROS data and work is proceeding on extending the capability to receive GMS data. A similar system was proposed as an archival and analysis system for use with INSAT data and studies are underway to modify the system to receive the planned SeaWiFS (ocean color) data. This system was proposed as the core of a number of international programs in support of U.S. AID activities. Systems delivered or nearing final testing are listed.

Stetina, F.

1988-01-01

176

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

177

Real-Time Surface Traffic Adviser  

NASA Technical Reports Server (NTRS)

A real-time data management system which uses data generated at different rates by multiple heterogeneous incompatible data sources are presented. In one embodiment, the invention is as an airport surface traffic data management system (traffic adviser) that electronically interconnects air traffic control, airline, and airport operations user communities to facilitate information sharing and improve taxi queuing. The system uses an expert system to fuse dam from a variety of airline, airport operations, ramp control, and air traffic control sources, in order to establish, predict, and update reference data values for every aircraft surface operation.

Glass, Brian J. (Inventor); Spirkovska, Liljana (Inventor); McDermott, William J. (Inventor); Reisman, Ronald J. (Inventor); Gibson, James (Inventor); Iverson, David L. (Inventor)

2001-01-01

178

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

179

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

180

Real-time fractal signal processing in the time domain  

NASA Astrophysics Data System (ADS)

Fractal analysis has proven useful for the quantitative characterization of complex time series by scale-free statistical measures in various applications. The analysis has commonly been done offline with the signal being resident in memory in full length, and the processing carried out in several distinct passes. However, in many relevant applications, such as monitoring or forecasting, algorithms are needed to capture changes in the fractal measure real-time. Here we introduce real-time variants of the Detrended Fluctuation Analysis (DFA) and the closely related Signal Summation Conversion (SSC) methods, which are suitable to estimate the fractal exponent in one pass. Compared to offline algorithms, the precision is the same, the memory requirement is significantly lower, and the execution time depends on the same factors but with different rates. Our tests show that dynamic changes in the fractal parameter can be efficiently detected. We demonstrate the applicability of our real-time methods on signals of cerebral hemodynamics acquired during open-heart surgery.

Hartmann, András; Mukli, Péter; Nagy, Zoltán; Kocsis, László; Hermán, Péter; Eke, András

2013-01-01

181

Real-Time Control System Software for Intelligent System Development  

E-print Network

arisen. Sys- tems operating with such controllers have been called Real-Time Control Systems (RCSReal-Time Control System Software for Intelligent System Development: Experiments Systems Development Several practical issues surround the development of complex real-time control

182

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

183

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

2013-12-06

184

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

185

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

186

Development of real-time photoacoustic microscopy  

NASA Astrophysics Data System (ADS)

Photoacoustic tomography detecting ultrasound signals generated from photon absorption provides optical absorption contrast in vivo for structural, functional and molecular imaging. Although photoacoustic tomography technology has grown fast in recent years, real-time photoacoustic imaging with cellular spatial resolution are still strongly demanded. We developed a photoacoustic microscopy which has video-rate imaging capability with cellular spatial resolution. The system consists of a single-element focused ultrasound transducer, a fiber-based light-delivery subsystem, a voice-coil translation stage, a motion controller, and a data acquisition subsystem. A compact cube is employed to split optical and acoustic beams. The mass of the entire scanning photoacoustic probe is less than 40 grams, which minimizes potential vibrations and inertial effects, therefore, makes it capable to scan fast. The imaging system is capable of acquiring 20 cross-sectional (B-scan) images per second over 9 mm, and up to 40 B-scan images per second over 1 mm. Focused laser beams provide a lateral resolution of five microns. Confocal deployment of optical and acoustic focuses provides higher SNR than optical scanning approach. Micron-sized carbon particles flowing in silicone tubing and in vivo blood flows were imaged in video-rate, which demonstrated the capability to image highly dynamic biological processes in vivo with cellular resolution. This real-time high-resolution photoacoustic imaging system provides a promising approach for various in vivo imaging and quantitative studies.

Wang, Lidai; Maslov, Konstantin; Yao, Junjie; Li, Li; Wang, Lihong V.

2011-03-01

187

On quantum tunneling in real time  

NASA Astrophysics Data System (ADS)

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 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.

Turok, Neil

2014-06-01

188

HABE real-time image processing  

NASA Astrophysics Data System (ADS)

The HABE system performs real-time autonomous acquisition, pointing and tracking (ATP). The goal of the experiment, sponsored by the Ballistic Missile Defense Organization and administered by the US Air Force Research Laboratory, Kirtland AFB, Albuquerque, NM, is to demonstrate the acquisition, tracking and pointing technologies needed for an effective space-based missile defense system. The three sensor tracking system includes two IR cameras for passive tracking of a missile plume and an intensified visible camera used to capture the return of a high-energy laser pulse reflected by the missile's nose. The HABE real-time image processor uses the images captured by each sensor to find a track point. The VME-based hardware includes four Compaq Computer Corporation Alpha processors and seven Texas Instruments TMS320C4X processors. The C4x comports and the VME bus provide the pathways needed for inter-processor communications. The software design implements a list processing approach to command and control which provides for flexible task redefinition, addition, and deletion while minimizing the need for code changes. The design is implemented in C. Several system performance metrics are described and tabulated.

Krainak, Joseph C.

1999-07-01

189

An overview of the Rialto real-time architecture  

Microsoft Academic Search

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

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

1996-01-01

190

Passive Global, Real-Time TEC Monitoring  

NASA Astrophysics Data System (ADS)

Sensors are being developed to provide a satellite-based VHF global lightning monitor (e.g. Suszcynsky, et al., "VHF Global Lightning and Severe Storm Monitoring from Space: Storm-level Characterization of VHF Lightning Emissions," EOS Trans. AGU 2001 Fall Mt. Prog. And Abstr. 82, No. 47, F143, 2001). Dispersive effects of propagation of the lightning electromagnetic wave through the ionospheric and plasmaspheric plasmas cause the higher frequency components to arrive at the satellite before lower frequency components. From the time-of-arrival at several frequencies we can derive the TEC between the satellite and the lightning. Using multi-satellite techniques we can geolocate the lightning and the ionospheric penetration point quite accurately. A single ground station could provide essentially real-time regional TEC coverage. Four ground stations could provide global, real-time TEC measurements to supplement existing ground-based systems, especially over broad ocean areas. We expect several lightning detections per satellite per minute. Temporal resolution will be limited only by ground segment processing. Spatial coverage and resolution will be limited by lightning occurrence, but many commercial sector TEC requirements are also correlated to lightning occurrence. With our FORTE (Fast On-orbit Recording of Transient Events) satellite we sense lightning over most of the globe including the oceans. We expect to determine TEC spatial gradients with tens of km resolution. This capability should be especially useful in severe convective weather to aircraft using GPS-based navigation, e.g. the FAA's Wide Area Augmentation System (WAAS).

Pongratz, M. B.

2002-12-01

191

Efficient replication control in distributed real-time databases  

Microsoft Academic Search

Summary form only given. Recently, the demand for real-time data services has been increasing. Many e-commerce applications and information services are requiring sophisticated real-time data support. A database is a core component for such real-time applications. Important to the functionality of real-time databases is data replication, which is used to meet critical time requirements. These requirements vary with different workloads;

Andrew Aslinger; Sang H. Son

2005-01-01

192

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

193

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

194

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

195

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

196

Real time speech formant analyzer and display  

DOEpatents

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

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

1987-02-03

197

Real time speech formant analyzer and display  

DOEpatents

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

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

1987-01-01

198

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

199

In-line real time air monitor  

DOEpatents

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

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

1998-01-01

200

REAL TIME DATA FOR REMEDIATION ACTIVITIES [11505  

SciTech Connect

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

BROCK CT

2011-01-13

201

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

202

Spectral tracking of objects in real time  

NASA Astrophysics Data System (ADS)

Advanced multispectral, or hyperspectral, camera systems are being used to identify objects of interest on the basis of spectral characteristics. This paper will describe developments in the field of a real time spectral matched filtering. Matched filtering relies on there being a measurable difference between the spectrum of the target and that of background materials such as soil, vegetation, concrete and tarmac. If prior knowledge is available then the target can be found by matching the two spectra numerically. Previous work has identified the most robust and effective matched filtering technique. Software has been written to interface with a pushbroom hyperspectral sensor to enable fast spectrally tracking of objects. False alarms have been reduced by means of additional processing. Example detections of a number of unclassified objects will be presented.

Bishop, Gary J.; Killey, Ainsley; Porter, Matthew D.; Blagg, Adrian S.

2008-10-01

203

Unmanned tactical reconnaissance in real time  

NASA Astrophysics Data System (ADS)

The next generation of unmanned tactical reconnaissance aircraft are designed to coniplement manned reconnaissance aircraft in meeting the needs for high resolution tactical imagery in a high threat environment. The unmanned recce aircraft is well suited for applications in which the target area is well known and heavily defended. These targets are often located in rear areas well beyond the FEBA and outside of radio line-of-sight (LOS). The UAV must operate autonomously to record reconnaissance information and transmit this imagery in near- real-time when data link coiununications can be established with the controlling ground processing facility. This paper describes current concepts which improve the timeliness of data and provide additional synergism between manned and unmanned tactical reconnaissance systems. The UAV significantly extends the operational range and enhances versatility of tactical reconnaissance at low risk and low cost.

Hansen, Bertel J.

1990-11-01

204

Public Science with Real-Time Experiments  

NASA Astrophysics Data System (ADS)

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

Lenardic, A.

2013-12-01

205

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

NASA Astrophysics Data System (ADS)

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

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

2014-05-01

206

Distributed Real Time Neural Networks In Interactive Complex Systems  

E-print Network

Complex- ity]: Miscellaneous; I.2 [Artificial Intelligence]: Distributed Artificial Intelligence; I.6 Keywords real time, distributed computing, artificial neural networks, robotics 1. INTRODUCTION graphical softwares which help the modeling and the simulation of real time, distributed neural networks

Paris-Sud XI, Université de

207

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

208

Real Time Visualization of Structural Response through Wireless  

E-print Network

1 Real Time Visualization of Structural Response through Wireless Communication using MEMS Sensors Real Time Visualization of Structural Response through Wireless Communication using MEMS Sensors of MEMS technologies such as mechanical elements, sensors, actuators, and electronics on a common silicon

Shinozuka, Masanobu

209

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

210

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

E-print Network

Linguistic Indexing for Pictures - Real Time plant, flower, landscape, people, tulip flower, plant,lake, rural, building tree, plant, people, water, garden animal, people, wild-life, dog, landscape Jia Li is described by several words: ``autumn, tree, landscape, lake''. A total of 332 distinct words. Jia Li, James

Li, Jia

211

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

Microsoft Academic Search

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

B. Brandenburg; James H. Anderson

212

Searching Solitaire in Real Time 131 SEARCHING SOLITAIRE IN REAL TIME  

E-print Network

process planning can be formulated as search problems, where the goal is to find a sequence of actions from an initial state to a goal state. In real-time search, one needs to commit to an action the search along fruitful directions. However, simply choosing an action greedily according to one

213

Real-Time Spatiotemporal Data Indexing Structure  

E-print Network

This document describes the Po-tree, a new indexing structure for spatiotemporal databases with soft real time constraints. This is crucial for risk management, particularly for the monitoring of volcanic risk. For example, the Popocatepetl, a Mexican volcano, is closely monitored through an network of spatially referenced sensors. They all send back their measurements to a central spatiotemporal database. The Po-tree shall therefore be able to index huge quantities of data in a restricted amount of time. It shall also be able to favor the newer data, which are queried more frequently. While most structures tend to favor the temporal aspect over the spatial, or tend to consider time as another spatial dimension, the Po-tree offers an alternative. It does so by combining two different structures, for spatial and temporal dimensions respectively, stressing the spatial aspect, and linking every source of information to a new temporal sub-tree. While mobility is not yet supported, experimentations and comparisons have shown interesting potential in the structure.

Guillaume Noël; Sylvie Servigne; Robert Laurini

2004-01-01

214

Real-Time Optical Antimicrobial Susceptibility Testing  

PubMed Central

Rapid antibiotic susceptibility testing is in high demand in health care fields as antimicrobial-resistant bacterial strains emerge and spread. Here, we describe an optical screening system (oCelloScope) which, based on time-lapse imaging of 96 bacteria-antibiotic combinations at a time, introduces real-time detection of bacterial growth and antimicrobial susceptibility with imaging material to support the automatically generated graphs. Automated antibiotic susceptibility tests of a monoculture showed statistically significant antibiotic effects within 6 min and within 30 min in complex samples from pigs suffering from catheter-associated urinary tract infections. The oCelloScope system provides a fast high-throughput screening method for detecting bacterial susceptibility that might entail an earlier diagnosis and introduction of appropriate targeted therapy and thus combat the threat from multidrug-resistant pathogenic bacteria. The oCelloScope system can be employed for a broad range of applications within bacteriology and might present new vistas as a point-of-care instrument in clinical and veterinary settings. PMID:23596243

Andersen, Klaus R.; J?rgensen, Erik; Droce, Aida; Olesen, Tom; Jensen, Bent B.; Rosenvinge, Flemming S.; Sondergaard, Teis E.

2013-01-01

215

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

216

Following Michael Faraday's Footprints  

NASA Astrophysics Data System (ADS)

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

Galeano, Javier

2011-01-01

217

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

218

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

219

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

220

CDx: a family of real-time Java benchmarks  

Microsoft Academic Search

Java is becoming a viable platform for hard real-time computing. There are production and research real-time Java VMs, as well as applications in both military and civil sector. Technological advances and increased adoption of Real-time Java contrast significantly with the lack of real-time benchmarks. The few benchmarks that exist are either low-level synthetic micro-benchmarks, or benchmarks used internally by companies,

Tomás Kalibera; Jeff Hagelberg; Filip Pizlo; Ales Plsek; Ben Titzer; Jan Vitek

2009-01-01

221

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

222

Real time simulation for the study on smart grid  

Microsoft Academic Search

This paper introduces the latest real time simulation technologies and their applications to the smart grid related studies. A real time simulation platform now built at the Ohio State University is described in detail. With the help of this platform, distributed real time simulation of complex power system integrated with high switching speed power electronics components, renewable energy resources, and

Feng Guo; Luis Herrera; Robert Murawski; Ernesto Inoa; Chih-Lun Wang; Yi Huang; Eylem Ekici; Jin Wang; Philippe Beauchamp

2011-01-01

223

REAL-TIME WATER WAVES WITH WAVE PARTICLES  

E-print Network

REAL-TIME WATER WAVES WITH WAVE PARTICLES A Dissertation by Cem Yuksel Submitted to the Office of DOCTOR OF PHILOSOPHY August 2010 Major Subject: Computer Science #12;REAL-TIME WATER WAVES WITH WAVE, Valerie E. Taylor August 2010 Major Subject: Computer Science #12;iii ABSTRACT Real-time Water Waves

Keyser, John

224

Instantly Decodable Network Codes for Real-Time Applications  

E-print Network

in packet recovery for real- time applications, such as, fast-paced multi-player games and live video streaming. Real-time applications have two distinct characteristics: (i) they have strict and urgent is NP-hard. To do so, we first map Real-Time IDNC to the Maximum Clique problem in an IDNC graph (to be

Markopoulou, Athina

225

A real time image generation system and its applications  

Microsoft Academic Search

A real time image generation system which generates images of shaded objects in three-dimensional space at a 60 fields\\/s rate is described. It features real time image generation, real time data update, programmable system flexibility, and stereoscopic animation. The system consists of engineering workstations, digital signal processing, and shading hardware. It is suitable for personal, public, and business applications, such

Hirofumi Ishida; Noriko Iwata; Keiji Nemoto

1990-01-01

226

A Java Processor Architecture for Embedded Real-Time Systems  

E-print Network

language are used on top of a small real-time operating system. Many of the benefits of Java, such as safeA Java Processor Architecture for Embedded Real-Time Systems Martin Schoeberl Institute of Computer for applications in embedded real-time systems and the primary implementation technology is in a field programmable

227

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

228

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

229

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

230

Real-time support for high performance aircraft operation  

NASA Technical Reports Server (NTRS)

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

Vidal, Jacques J.

1989-01-01

231

Real-time Crisis Mapping of Natural Disasters using  

E-print Network

Real-time Crisis Mapping of Natural Disasters using Social Media Stuart E. Middleton, Lee Middleton crisis mapping platform for natural disasters. We take locations from gazetteer, street map-parsed real-time tweet data streams. We use statistical analysis to generate real-time crisis maps. Geo

Middleton, Stuart E.

232

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

233

An Experimental Evaluation of Real-Time DVFS Scheduling Algorithms  

E-print Network

Descriptors C.3 [Special-Purpose and Application-based Systems]: Real-time and embedded systems; D.4 the schedulers in a real-time Linux ker- nel and measured their timeliness and energy consumption under a rangeAn Experimental Evaluation of Real-Time DVFS Scheduling Algorithms Sonal Saha ECE Dept., Virginia

Ravindran, Binoy

234

Compositional Analysis Techniques For Multiprocessor Soft Real-Time Scheduling  

E-print Network

and continue to expand in the domain of embedded systems. Second, real-time concepts are being appliedCompositional Analysis Techniques For Multiprocessor Soft Real-Time Scheduling Hennadiy Leontyev HENNADIY LEONTYEV: Compositional Analysis Techniques For Multiprocessor Soft Real-Time Scheduling. (Under

Whitton, Mary C.

235

Compositional Analysis Techniques For Multiprocessor Soft RealTime Scheduling  

E-print Network

systems and continue to expand in the domain of embedded systems. Second, real­time concepts are beingCompositional Analysis Techniques For Multiprocessor Soft Real­Time Scheduling Hennadiy Leontyev; ABSTRACT HENNADIY LEONTYEV: Compositional Analysis Techniques For Multiprocessor Soft Real­Time Scheduling

Anderson, James

236

The Advanced Correlation Tracker in Real-Time  

Microsoft Academic Search

Real-time detection, tracking and classification of objects in images are some of the more computationally demanding tasks in computer vision. Tracking systems such as correlation trackers are notorious for computational demands. Real-time performance is not achievable on general purpose microprocessors. This paper details the architectural issues tackled to create a real time realisation of the Advanced Correlation Tracker (ACT) algorithm

Sebastien Wong; Brendan Hennessy

2008-01-01

237

MULTIOBJECTIVE SYNTHESIS OF LOW-POWER REAL-TIME  

E-print Network

a method for analyzing the manner in which real-time operating system use influences embedded system power a method of analyzing the effects of real-time operating system usage on the overall performance and power to Niraj Jha, Anand Raghunathan and Ganesh Lakshminarayana collab- orated on the real-time operating system

Coello, Carlos A. Coello

238

SCHEDULING AND LOCKING IN MULTIPROCESSOR REAL-TIME OPERATING SYSTEMS  

E-print Network

SCHEDULING AND LOCKING IN MULTIPROCESSOR REAL-TIME OPERATING SYSTEMS Bj¨orn B. Brandenburg and Locking in Multiprocessor Real-Time Operating Systems (Under the direction of James H. Anderson of multicore-ready real-time operating systems: (1) Which scheduling policies offer the greatest flexibility

Whitton, Mary C.

239

Faraday, Maxwell And 150 Years  

E-print Network

It was 150 years ago that the English scientist Michael Faraday discovered that he could generate electricity's Conversations on Chemistry. ____________ Origins Michael Faraday was born on the 22nd of September, 1791#12;#12;LINES AND WAVES Faraday, Maxwell And 150 Years Of Electromagnetism Robert D. Friedel Center

Jones, R. Victor

240

Real-time optoacoustic monitoring of stroke  

NASA Astrophysics Data System (ADS)

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

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

2014-03-01

241

ARGO: Observing the Ocean in Real Time  

NSDL National Science Digital Library

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

242

Integrating Multimedia Applications in Hard Real-Time Systems  

Microsoft Academic Search

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

Luca Abeni; Giorgio C. Buttazzo

1998-01-01

243

ControlShell - A real-time software framework  

NASA Technical Reports Server (NTRS)

ControlShell is designed to enable modular design and impplementation of real-time software. It is an object-oriented tool-set for real-time software system programming. It provides a series of execution and data interchange mechansims that form a framework for building real-time applications. These mechanisms allow a component-based approach to real-time software generation and mangement. By defining a set of interface specifications for intermodule interaction, ControlShell provides a common platform that is the basis for real-time code development and exchange.

Schneider, Stanley A.; Ullman, Marc A.; Chen, Vincent W.

1991-01-01

244

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

E-print Network

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

Paris-Sud XI, Université de

245

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

246

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

247

Real-time accumulative computation motion detectors.  

PubMed

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

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

2009-01-01

248

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

249

A SFCL modeling and application with real HTS material connecting to real time simulator  

Microsoft Academic Search

We propose a real time simulation method for the SFCL (superconducting fault current limiter) modeling and application with the real HTS (high temperature superconducting) material by using RTDS (real time digital simulator), and the transient phenomenon of SFCL system was analyzed in the simulated utility power network. SFCL components were modeled with the test sample of Bi-2223 and YBCO HTS

J. H. Kim; M. H. Ali; A. R. Kim; S. R. Lee; J. Y. Yoon; J. Cho; K. D. Sim; S. H. Kim; I. K. Yu

2008-01-01

250

Real time railway traffic management modeling track-circuits  

E-print Network

Real time railway traffic management modeling track-circuits Paola Pellegrini, Grégory Marlière.rodriguez@ifsttar.fr Abstract The real time railway traffic management seeks for the train routing and scheduling that minimize tested the proposed formulation on real perturbation instances representing traffic in a control area

Paris-Sud XI, Université de

251

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

252

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

253

Apparatus Characterizes Transient Voltages in Real Time  

NASA Technical Reports Server (NTRS)

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

Medelius, Pedro

2005-01-01

254

Energy Efficient Scheduling for Real-Time Systems  

E-print Network

The goal of this dissertation is to extend the state of the art in real-time scheduling algorithms to achieve energy efficiency. Currently, Pfair scheduling is one of the few scheduling frameworks which can optimally schedule a periodic real...

Gupta, Nikhil

2012-02-14

255

Extreme events in Faraday waves  

NASA Astrophysics Data System (ADS)

Observations of extreme wave events in the ocean are rare due to their low statistical probability. In the laboratory however, the evolution of extreme wave events can be studied in great detail with high spatial and temporal resolution. The reported surface wave experiments in the short wavelength gravity-capillary range aim to contribute to the understanding of some of the underlying mechanisms for rogue wave generation. In this talk, we report on extreme wave events in parametrically excited Faraday waves. Faraday waves appear if a fluid is accelerated (normal to the fluid surface) above a critical threshold. A variety of novel tools have been deployed to characterize the 2D surface elevation. The results presented show spatio-temporal and statistical data on the surface wave conditions leading up to extreme wave events. The peak in wave amplitude during such an event is shown to exceed six times the standard deviation of the average wave field with significantly increased statistical probability compared to the background wave field [1]. The experiments also show that parametrically excited waves can be viewed as assembles of oscillons [2] (or oscillating solitons) where modulation instability seems to play a crucial role in their formation. More detailed studies on the oscillon dynamics reveal that the onset of an increased probability of extreme wave events correlates with the increase in the oscillons mobility and merger [3]. Reference: 1. Xia H., Maimbourg T., Punzmann H., and Shats M., Oscillon dynamics and rogue wave generation in Faraday surface ripples, Physical Review Letters 109, 114502 (2012) 2. Shats M., Xia H., and Punzmann H., Parametrically excited water surface ripples as ensembles of oscillons, Physical Review Letters 108, 034502 (2012) 3. Shats M., Punzmann H., Xia H., Capillary rogue waves, Physical Review Letters, 104, 104503 (2010)

Punzmann, Horst; Shats, Michael; Xia, Hua

2014-05-01

256

Real time observation of anaphase in vitro.  

PubMed Central

We used digital fluorescence microscopy to make real-time observations of anaphase chromosome movement and changes in microtubule organization in spindles assembled in Xenopus egg extracts. Anaphase chromosome movement in these extracts resembled that seen in living vertebrate cells. During anaphase chromosomes moved toward the spindle poles (anaphase A) and the majority reached positions very close to the spindle poles. The average rate of chromosome to pole movement (2.4 microns/min) was similar to earlier measurements of poleward microtubule flux during metaphase. An increase in pole-to-pole distance (anaphase B) occurred in some spindles. The polyploidy of the spindles we examined allowed us to observe two novel features of mitosis. First, during anaphase, multiple microtubule organizing centers migrated 40 microns or more away from the spindle poles. Second, in telophase, decondensing chromosomes often moved rapidly (7-23 microns/min) away from the spindle poles toward the centers of these asters. This telophase chromosome movement suggests that the surface of decondensing chromosomes, and by extension those of intact nuclei, bear minus-end-directed microtubule motors. Preventing the inactivation of Cdc2/cyclin B complexes by adding nondegradable cyclin B allowed anaphase A to occur at normal velocities, but reduced the ejection of asters from the spindles, blocked chromosome decondensation, and inhibited telophase chromosome movement. In the presence of nondegradable cyclin B, chromosome movement to the poles converted bipolar spindles into pairs of independent monopolar spindles, demonstrating the role of sister chromatid linkage in maintaining spindle bipolarity. Images Fig. 1 Fig. 2 Fig. 4 Fig. 5 PMID:8901580

Murray, A W; Desai, A B; Salmon, E D

1996-01-01

257

Raconteur: integrating authored and real-time social media  

Microsoft Academic Search

Social media enables people to share personal experiences, often through real-time media such as chat. People also record their life experiences in media collections, with photos and video. However, today's social media force a choice between real-time communication, and authoring a coherent story illustrated with digital media. There is simply not enough time in real-time communication to select and compose

Pei-Yu Chi; Henry Lieberman

2011-01-01

258

MEAD: support for Real-Time Fault-Tolerant CORBA  

Microsoft Academic Search

SUMMARY The OMG's Real-Time CORBA (RT-CORBA) and Fault-Tolerant CORBA (FT-CORBA) specifications make it possible for today's CORBA implementations to exhibit either real-time or fault tolerance in isolation. While real-time requires ap rioriknowledge of the system's temporal operation, fault tolerance necessarily deals with faults that occur unexpectedly, and with possibly unpredictable fault recovery times. The MEAD (Middleware for Embedded Adaptive Dependability)

Priya Narasimhan; Tudor Dumitras; Aaron M. Paulos; Soila M. Pertet; Carlos F. Reverte; Joseph G. Slember; Deepti Srivastava

2005-01-01

259

Application specific real-time microkernel in hardware  

Microsoft Academic Search

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

Susanna Nordström; Lennart Lindh; Lars Johansson; Tobias Skoglund

2005-01-01

260

PERTS: A Prototyping Environment for Real-Time Systems  

NASA Technical Reports Server (NTRS)

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

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

1993-01-01

261

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

262

Real Time Wide Area Radiation Surveillance System  

NASA Astrophysics Data System (ADS)

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

Biafore, M.

2012-04-01

263

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

264

PERTS: A Prototyping Environment for Real-Time Systems  

NASA Technical Reports Server (NTRS)

We discuss an ongoing project to build a Prototyping Environment for Real-Time Systems, called PERTS. PERTS is a unique prototyping environment in that it has (1) tools and performance models for the analysis and evaluation of real-time prototype systems, (2) building blocks for flexible real-time programs and the support system software, (3) basic building blocks of distributed and intelligent real time applications, and (4) an execution environment. PERTS will make the recent and future theoretical advances in real-time system design and engineering readily usable to practitioners. In particular, it will provide an environment for the use and evaluation of new design approaches, for experimentation with alternative system building blocks and for the analysis and performance profiling of prototype real-time systems.

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

1991-01-01

265

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

266

Real-time 3D model acquisition  

Microsoft Academic Search

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

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

2002-01-01

267

A real-time IMT2000 audio transmission system  

Microsoft Academic Search

For real-time audio streaming services over next-generation mobile phone systems, such as live concert broadcasting and radio relaying, we have developed a realtime IMT-2000 audio transmission system. This system consists of a real-time encoder and a portable real-time decoder, which are both based on fixed-point DSP chips. TWINVQ technology is used for audio compression, and a scheme to protect audio

Takeshi Mori; Takao Kaneko; Takehiro Moriya; K. Ikeda

2001-01-01

268

Real-time and postprocessing holographic effects in dichromated pullulan  

NASA Astrophysics Data System (ADS)

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

Savic, Svetlana; Pantelic, Dejan; Jakovijevic, Dragica

2002-08-01

269

rtORB: a real-time CORBA prototype  

Microsoft Academic Search

A real-time CORBA prototype called rtORB is presented. The key components of rtORB are mainly described. A platform dependent layer is introduced to enhance the portability of ORB. The scheduling service proposed in real-time CORBA specification is extended to support dynamic scheduling. An explicit binding model is used to establish predictable communication channel. A delayered real-time POA (portable object adapter)

Peng Jian; Liu Jin-de; Tan Hao; Luo Zhi-gang

2003-01-01

270

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

271

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

272

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

273

A Step to Support Real-Time in Virtual Machine  

Microsoft Academic Search

Real-time is one of the unique requirements in embedded systems. In this paper, we perform a feasibility study on how to support real-time in an embedded virtual machine system. Firstly, we argue that the I\\/O model of the current virtual machine monitor like Xen is not suitable to support real-time applications because it lacks in predictability and it does not

Seehwan Yoo; Miri Park; Chuck Yoo

2009-01-01

274

Feedback Control Real-Time Scheduling in ORB Middleware  

Microsoft Academic Search

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

Chenyang Lu; Xiaorui Wang; Christopher D. Gill

2003-01-01

275

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

276

IMPLEMENTATION OF A REAL TIME PASSENGER INFORMATION SYSTEM  

E-print Network

for passengers. A Real-Time Passenger Information System (RTPIS) uses a variety of technologies to track of GPS and the ubiquitous cellular network, real time vehicle tracking for better transport management. The increased waiting time and the uncertainty in bus arrival make public transport system unattractive

Sanyal, Sugata

277

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

278

Enhancing Real-Time CORBA Predictability and Performance  

Microsoft Academic Search

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

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

2003-01-01

279

Assessments of selected real-time computing technologies. Final report  

SciTech Connect

Developing dependable software for large, complex, real-time systems is one of the major challenges now facing the software industry. The software R and D community is responding to this challenge; numerous efforts have been initiated on various aspects of real-time software development. In this paper, we review and evaluate ongoing R and D efforts in light of the needs of strategic defense systems. We identify and discuss four recent developments that hold promise for facilitating the design and implementation of real-time software for strategic defense systems: (1) rate monotonic scheduling theory, (2) real-time extensions to the IEEE Portable Operating System Interface for Computer Environments (POSIX), (3) several distributed real-time operating system prototypes, and (4) various methods for enhancing real-time system robustness by trading precision of results for timeliness of results. We also point out an area of major concern to real-time software developers and, in particular, to the SDIO: the lack of analytical methods for evaluating the performance of complex real-time systems. We conclude with a series of recommendations on how the SDIO should follow up on the real-time R and D topics covered in the paper.

Gordon, K.D.; Rappoport, K.J.

1991-07-01

280

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

E-print Network

Time Properties Verification Framework for UML-MARTE Safety Critical Real-Time Systems Ning Ge for the reliability of Safety Critical Real-Time Systems (RTS). UML and MARTE are stan- dardized modelling languages, Model Checking 1 Introduction Safety Critical Real-Time Systems (RTS) have strong timing requirements

Paris-Sud XI, Université de

281

Algorithm for Unfolding Current from Faraday Rotation Measurement  

SciTech Connect

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

Stephen E. Mitchell

2008-05-23

282

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

283

Real-time Avatar Animation from a Single Image  

PubMed Central

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

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

2014-01-01

284

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

285

Energy Efficient Real-Time DVS based on Genetic Algorithm  

Microsoft Academic Search

This paper proposes a novel real-time dynamic voltage scheduling algorithm(GA-DVS) based on genetic algorithm for periodically real-time task set. Based on a mathematical system model in the real situation, the GA-DVS algorithm is different from classical DVS algorithms, some critical parts of which are specially designed, such as encoding, the fitness function, the crossover\\/mutation\\/repair operator and the termination condition; GA-DVS

Jin Jian Xun; Wang Huayong; Wun Nian; Wu Dexin; Wang Jian Fen

2008-01-01

286

Utility accrual real-time scheduling for multiprocessor embedded systems  

Microsoft Academic Search

We present the rst Utility Accrual (or UA) real-time scheduling algorithm for mul- tiprocessors, called global Multiprocessor Utility Accrual scheduling algorithm (or gMUA). The algorithm considers an application model where real-time activities are subject to time\\/utility function time constraints, variable execution time de- mands, and resource overloads where the total activity utilization demand exceeds the total capacity of all processors.

Hyeonjoong Cho; Binoy Ravindran; E. Douglas Jensen

2010-01-01

287

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

288

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

289

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

290

Real-time lane detection for autonomous navigation  

Microsoft Academic Search

A lane detection method 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 calculating time. The paper defines two searching ranges

Seung Gweon Jeong; Chang Sup Kim; Kang Sup Yoon; Jong Nyun Lee; Jong Il Bae; Man Hyung Lee

2001-01-01

291

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

292

Optimization of computer vision algorithms for real time platforms  

Microsoft Academic Search

Real time computer vision applications like video streaming on cell phones, remote surveillance and virtual reality have stringent performance requirements but can be severely restrained by limited resources. The use of optimized algorithms is vital to meet real-time requirements especially on popular mobile platforms. This paper presents work on performance optimization of common computer vision algorithms such as correlation on

Pramod Poudel; Mukul Shirvaikar

2010-01-01

293

An Analytic Model for Real-Time Multimedia Disk Scheduling  

Microsoft Academic Search

Traditionally, storage systems have been designed to provide good average performance without requiring explicit knowledge of the application requirements. However, with real-time multimedia applications, the knowledge of the requirements can be used by a storage system to schedule the real-time access of multiple streams. In this paper, we present an analytical model for a simple class of multimedia system, and

James Yee; Pravin Varaiya

1992-01-01

294

Scheduling Algorithms for Soft Real-Time Systems  

E-print Network

Scheduling Algorithms for Soft Real-Time Systems Luca Abeni ReTiS Lab Scuola Superiore S.Anna, Pisa, Italy luca@hartik.sssup.it http://hartik.sssup.it/~luca #12; Luca Abeni - 2000 Summary #5; Introduction Reservation #5; Adaptive Scheduling #12; Luca Abeni - 2000 Real-Time #5; Lots of applications present precise

Abeni, Luca

295

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 susceptible to landslides, real-time monitoring of a regional network of telemetering rain gages, and National Weather Service precipitation forecasts. This system

David K. Keefer; Raymond C. Wilson; Robert K. Mark; Earl E. Brabb; William M. Brown; Stephen D. Ellen; Edwin L. Harp; Gerald F. Wieczorek; Christopher S. Alger; Robert S. Zatkin

1987-01-01

296

Real-Time Web-Based System Monitoring  

Microsoft Academic Search

New techniques in software architecture and development have empowered users by giving them access to real-time plant data in a fluid and versatile environment. These solutions allow you to custom configure a control screen right from your Web browser with analog gauges, digital gauges, charts, spider charts and more. Data is sent in real-time from your PLCs directly to a

M. Branch; B. Bradley

2006-01-01

297

XMPP en het real-time web Robin Rutten (0712620)  

E-print Network

XMPP en het real-time web Robin Rutten (0712620) Begeleider: dr. Theo Schouten 21 juni 2010 #12;Inhoudsopgave 1 XMPP en het real-time web 3 1.1 Inleiding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Introductie XMPP 5 2.1 Waarom XMPP? . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2

Lucas, Peter

298

Real-time System Identification using Intelligent Algorithms  

Microsoft Academic Search

This research presents an investigation into the development of real time system identification using intelligent algorithms. A simulation platform of a flexible beam vibration using finite difference (FD) method is used to demonstrate the real time capabilities of the identification algorithms. A number of approaches and algorithms for on line system identifications are explored and evaluated to demonstrate the merits

A. A. M. Madkour; M. A. Hossain; K. P. Dahal; H. Yu

2004-01-01

299

Real-time collision avoidance method for unmanned ground vehicle  

Microsoft Academic Search

In this paper, a real-time collision avoidance method is proposed for unmanned ground vehicles (UGV). To ensure real-time implementation, virtual force fields are calculated in on dimensional space. The steering force field is generated by the steering command either transmitted in the remote control station or calculated in the autonomous navigation system (ANS) of the UGV. The obstacle force field

TokSon Choe; Jin Wook Hur; Jeong Sook Chae; Yong-Woon Park

2008-01-01

300

Supporting Pipelines in Soft Real-Time Multiprocessor Systems  

Microsoft Academic Search

In work on multiprocessor real-time systems, processing pipelines have received little attention. In this paper, soft real-time periodic task systems are considered that include such pipelines. Conditions are presented for guaranteeing bounded deadline tardiness in such systems under global EDF or FIFO multiprocessor scheduling.

Cong Liu; James H. Anderson

2009-01-01

301

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

302

Real-time system for monitoring driver vigilance  

Microsoft Academic Search

This paper presents a nonintrusive prototype computer vision system for monitoring a driver's vigilance in real time. It is based on a hardware system for the real-time acquisition of a driver's images using an active IR illuminator and the software implementation for monitoring some visual behaviors that characterize a driver's level of vigilance. Six parameters are calculated: Percent eye closure

Luis Miguel Bergasa; Jesús Nuevo; Miguel Ángel Sotelo; Rafael Barea; María Elena López Guillén

2006-01-01

303

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

304

An Intelligent Real-Time Communication Assistant for the Disabled  

Microsoft Academic Search

This research focuses on developing a real-time communication assistant for the disabled utilizing the biometric information of their facial features. Our targeted community is that with communication disabilities. While communicating effectively is a problem for this community, they have facial expressions and incomprehensible speech that can be interpreted to associate with their needs or requests. Thus, we utilize the real-time

Bee Theng Lau; Tran Cao Thai; Raymond Chiong

2009-01-01

305

Requirementsbased Monitors for RealTime Systems Dennis K. Peters  

E-print Network

Requirements­based Monitors for Real­Time Systems Dennis K. Peters Electrical and Computer safety- or mission-critical real-time sys- tems, a speci#12;cation of the required behaviour of the sys or part of this work for personal or classroom use is granted without fee provided that copies

Peters, Dennis

306

DARTPIV: Dynamic Adaptive Real-Time Particle Image Velocimetry  

E-print Network

1 DARTPIV: Dynamic Adaptive Real-Time Particle Image Velocimetry by Samvaran Sharma Submitted Adaptive Real-Time Particle Image Velocimetry by Samvaran Sharma Submitted to the Department of Electrical of Engineering Abstract Particle Image Velocimetry (PIV) is a technique that allows for the detailed

Tedrake, Russ

307

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

308

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

309

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...

310

Two Wheeled Vehicle Dynamics Synthesis for Real-Time Applications  

E-print Network

Two Wheeled Vehicle Dynamics Synthesis for Real-Time Applications Salim Hima and Hichem Arioui into a two wheeled vehicles real-time applications such as driving simulators. The synthesized model takes dynamics, Recursive Newton-Euler algorithm. 1. INTRODUCTION IN the two last decades, the safety of ground

Paris-Sud XI, Université de

311

Real time Tarp-linear estimator for image noise reduction  

Microsoft Academic Search

Many efficient wavelet domain estimation algorithms for noise reduction have been proposed in the literature. All of them are based on variance estimation, which require all wavelet coefficients to be saved in the memory thus causing constrains towards the development of real time system. Tarp filter has been used successfully for online\\/real-time variance estimation of the multilevel wavelets and has

USMAN ALI; SHAHID A. KHAN

2005-01-01

312

Real Time Mechatronic Design Process for Research and Education  

Microsoft Academic Search

This paper presents the design methodology used in various real time mechatronics projects that involve data acquisition, real time control and embedded processing. As a design philosophy, mechatronics serves as an integrating approach to engineering design. A mechatronically designed product relies heavily on system sensing and component modeling and simulation to establish the optimal design tradeoffs between electronic and mechanical

Devdas Shetty; Jun Kondo; Claudio Campana; Richard A. Kolk

2002-01-01

313

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

314

SPARTA: Simulation of Physics on a Real-Time Architecture  

Microsoft Academic Search

In this paper, we discuss hardware acceleration for real-time physical modeling that would allow for realistic virtual environments. Additionally, we propose algorithms and their architectural implementation (SPARTA), which is specifically tuned for real-time use. We expect performance orders of magnitude higher than general-purpose CPUs.

Benjamin Bishop; Thomas P. Kelliher; Mary Jane Irwin

2000-01-01

315

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

316

REAL-TIME ENVIRONMENTAL MONITORING: APPLICATIONS FOR HOMELAND SECURITY  

EPA Science Inventory

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

317

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.

318

Soft Real-Time Scheduling on Performance Asymmetric Multicore Platforms  

Microsoft Academic Search

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

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

2007-01-01

319

Implementation of Real-time Network Extension on Embedded Linux  

Microsoft Academic Search

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

Yuan Tian; Guoqiang Ren; Qinzhang Wu

2009-01-01

320

Towards Runtime Monitoring in Real-Time Systems  

Microsoft Academic Search

In this paper we present the state of our work on runtime monitoring for real-time systems: a way to observe system behavior online without unpredictably disturbing real-time properties. We discuss generic requirements to achieve these properties wherefrom we deduce our monitoring frame- work architecture. We describe this architecture in detail and discuss several challenges for our implemen- tation called Ferret.

Martin Pohlack; Bjorn Dobel; Adam Lackorzynski

321

National Spherical Torus Experiment (NSTX) Power Supply Real Time Controller  

E-print Network

to the converter transformer primary. Nominal pulse current rating of each PSS is 24kA­6sec/300sec on the Power Supply Real Time Controller (PSRTC). I. INTRODUCTION During a pulse the typical sequence of the system is given in Figure 1. Typically, upon initiation of a pulse the Power Supply Real Time

322

Real-Time Seizure Monitoring and Spectral Analysis Microsystem  

E-print Network

Real-Time Seizure Monitoring and Spectral Analysis Microsystem J. N. Y. Aziz, R. Karakiewicz, R of an envisioned miniature implantable brain implant for automated epileptic seizure therapy. The microsystem com demonstrate the functionality of the integrated microsystem in real-time epileptic seizure monitoring

Genov, Roman

323

Linux and Real-Time: Current Approaches and Future Opportunities  

E-print Network

Linux and Real-Time: Current Approaches and Future Opportunities Claudio Scordino, Student Member in using the Linux operating system in real-time systems, especially in control systems. The simple and elegant design of Linux guarantees robustness and very good performance, while its Open Source license

Lipari, Giuseppe

324

Real-Time Implementation of Airborne Inertial-SLAM  

E-print Network

Real-Time Implementation of Airborne Inertial-SLAM Jonghyuk Kim a and Salah Sukkarieh b a the challenges in real-time implementation of Simultaneous Localisation and Mapping (SLAM) on a UAV platform. When compared to the implementation of SLAM in 2D environments, airborne implementation imposes several

Kim, Jonghyuk "Jon"

325

Real-Time Monocular SLAM with Straight Lines  

Microsoft Academic Search

The use of line features in real-time visual tracking applications is common- place when a prior map is available, but building the map while tracking in real-time is much more difficult. We describe how straight lines can be added to a monocular Extended Kalman Filter Simultaneous Mapping and Locali- sation (EKF SLAM) system in a manner that is both fast

Paul Smith; Ian D. Reid; Andrew J. Davison

2006-01-01

326

Real-Time Localization and Elevation Mapping within Urban  

E-print Network

of simultaneous localization and mapping SLAM , con- sisting of a continuous state estimation problem autonomously in real-time the problem of simultaneous localization and mapping SLAM , consistingReal-Time Localization and Elevation Mapping within Urban Search and Rescue Scenarios Alexander

Nebel, Bernhard

327

On Real-Time Performance of Ahead-of-Time Compiled Java  

Microsoft Academic Search

One of the main challenges in getting acceptance for safe object-oriented languages in hard real-time systems is to combine automatic memory management with hard real-time constraints, while providing adequate general execution performance. An approach to real-time Java based on ahead-of-time compilation is presented, and real-time properties and problems are examined. In particular, achieving both low latency and high throughput in

Anders Nilsson; Sven Gestegard Robertz

2005-01-01

328

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

E-print Network

real-time operating system (RTOS). When multiple tasks are running concurrently in RTOS, the procesPredicting Time-Delays under Real-Time Scheduling for Linear Model Predictive Control Zhenwu Shi are executing concurrently on the same processor under real-time scheduling. In this paper, we propose

Zhang, Fumin

329

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

330

List Processing in Real Time on a Serial Computer  

E-print Network

A real-time list processing system is one in which the time required by each elementary list operation (CONS, CAR, CDR, RPLACA, RPLACD, EQ, and ATOM in LISP) is bounded by a (small) constant. Classical list processing ...

Baker, Henry G. Jr.

1977-04-01

331

Software development with real-time collaborative editing  

E-print Network

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

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

2012-01-01

332

Overview of real-time computer systems technical analysis of the Modcomp implementation of a proprietary system MAX IV'' and real-time UNIX system REAL/IX''  

SciTech Connect

There many applications throughout industry and government requiring real-time computing. Any application that monitors and/or controls a process would fit into this category. Some examples are: Nuclear power plants, Steel mills, Space program, etc. General Atomics uses eight real-time computer systems for control and high speed data acquisition required to run the nuclear fusion experiments. Real-Time computing can be defined as the ability to respond to asynchronous external events in a predictable (preferably fast) time frame. Real-Time computer systems are similar to other computers in many ways and may by used for general computing requirements such as Time-Sharing. However special hardware, operating systems and software had to be developed to meet the requirement for real-time computing. Traditionally, real-time computing has been a realm of proprietary operating systems with real-time applications written in FORTRAN and assembly language. In the past, these systems adequately served the needs of the real-time world. Many of these systems that were developed 15 years ago are still being used today. However the real-time world is now changing, demanding new systems to be developed. This paper gives a description of general real-time computer systems and how they differ from other systems. However, the main purpose of this paper is to give a detailed technical description of the hardware and operating systems of an existing proprietary system and a real-time UNIX system. The two real-time computer systems described in detail are Modcomp Classic III/95 with the MAX IV operating system and Modcomp TRI-D 9750 with the REAL/IX.2 operating system.

Cummings, J.

1990-10-01

333

Faraday-effect polarimeter-interferometer system for current density measurement on EASTa)  

NASA Astrophysics Data System (ADS)

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 × 1016 m-2 (˜2°), and the Faraday rotation angle rms phase noise is <0.1°.

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

334

Real-time iris tracking with a smart camera  

Microsoft Academic Search

This paper presents a real-time iris detection procedure for gray intensity images. Typical applications for iris detection utilize template and feature based methods. These methods are generally time and memory intensive and not applicable for all practical real-time embedded realizations. Here, we propose a method that utilizes a simple algorithm that is time-efficient with high detection and low error rates

Mehrube Mehrübeoglu; Ha Thi Bui; Lifford McLauchlan

2011-01-01

335

RTDD: A Real-Time Communication Protocol for Directed Diffusion  

Microsoft Academic Search

In this paper, we propose Real-Time Directed Diffusion (RTDD), a real-time communication protocol for directed diffusion. Using the mechanisms provided by directed diffusion, we implement a prioritized scheduling policy over diffusion. With just a few extensions, RTDD significantly enhances the directed diffusion protocol, allowing time-critical flows to delivery more packets on time. We also propose two new scheduling policies which

Kenan Casey; Raghu Neelisetti; Alvin Lim

2008-01-01

336

Triggered Updates for Temporal Consistency in Real-Time Databases  

Microsoft Academic Search

A real-time database systemhas temporal consistency constraints in addition to timing constraints.The timing constraints require a transaction to be completedby a specified deadline, and the temporal consistency constraintsrequire that temporal data read by a transaction be up-to-date.If a transaction reads out-of-date data, it will become temporallyinconsistent. A real-time database system consists of differenttypes of temporal data objects, including derived objects.

Quazi N. Ahmed; Susan V. Vrbsky

2000-01-01

337

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

338

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

339

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

E-print Network

you want to wait for; if it is not, you can cancel the transfer and move on. The down­loaded file streaming­video technique uses special software on a server to transfer highly compressed movie filesJ.A. Barchanski, Real­Time Streaming Video for Ethernet LANs 1 Real­Time Streaming Video

340

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

341

Portable real-time color night vision  

Microsoft Academic Search

We developed a simple and fast lookup-table based method to derive and apply natural daylight colors to multi-band night-time images. The method deploys an optimal color transformation derived from a set of samples taken from a daytime color reference image. The colors in the resulting colorized multiband night-time images closely resemble the colors in the daytime color reference image. Also,

Alexander Toet; Maarten A. Hogervorst

2008-01-01

342

Efficient Scheduling of Soft Real-Time Applications on Multiprocessors  

Microsoft Academic Search

In soft real-time applications, tasks are allowed to miss their deadlines. Thus, less-costly scheduling algorithms can be used at the price of occasional violations of timing constraints. This may be acceptable if reasonable tardiness bounds (i.e., bounds on the extent to which deadlines may be missed) can be guaranteed. In this paper, we consider soft real-time applications implemented on multiprocessors.

Anand Srinivasan; James H. Anderson

2003-01-01

343

VHDL Design for Real Time Motion Estimation Video Applications  

Microsoft Academic Search

The VHDL design code and its implementation using 0.25 ?m technology have been demonstrated for the real time video applications.\\u000a The processing time of a frame running at 400 MHz was estimated to be 8.1 ms for QCIF and CIF Sequences, which accommodates\\u000a more than 120 frames per second, and this warrant real time video codec. The design was validated and simulated using

Robert Meagher; Modukuri Sushmitha; Maher E. Rizkalla; Paul Salama; Mohamed El-sharkawy

2009-01-01

344

Arctic: A functional language for real-time control  

Microsoft Academic Search

Arctic is a language for the specification and implementation of real-time control systems. Unlike more conventional languages for real-time control, which emphasize concurrency, Arctic is a stateless language in which the relationships between system inputs, outputs and intermediate terms are expressed as operations on time-varying functions. Arctic allows discrete events or conditions to invoke and modify responses asynchronously, but because

Roger B. Dannenberg

1984-01-01

345

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

346

Vector processing enhancements for real-time image analysis.  

SciTech Connect

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

Shoaf, S.; APS Engineering Support Division

2008-01-01

347

Using pSOS+ for embedded real-time computing  

Microsoft Academic Search

The process of developing system-level software for embedded real-time reduced-instruction-set-computer- (RISC-) based designs is much more complex than for complex-instruction-set-computer- (CISC-) based embedded real-time designs. The use of the pSOS+ kernal can assist developers in coping with this complexity, allowing RISC-based embedded designs to be completed in time periods comparable with more traditional CISC-based designs. Benefits are also enjoyed in

L. M. Thompson

1990-01-01

348

Evaluation of an automated real-time spectral analysis technique  

Microsoft Academic Search

An adaptive real-time Doppler peak-frequency tracing algorithm was evaluated in vitro and compared to manual peak-frequency traces. A computer-controlled pump was used to generate physiological flow waveforms in a vasculature-mimicking phantom. Spectral waveforms were obtained on an ATL HDI along with real-time estimates of diagnostic parameters, including maximum systolic, minimum diastolic, time-averaged peak frequencies and pulsatility and resistance indices. The

D. W. Rickey; A. Fenster

1996-01-01

349

Managing Online Self-adaptation in Real-Time Environments  

Microsoft Academic Search

This paper provides a solution to the deliberation schedul- ing problem for self-adaptive hard real time intelligent control using the Self-Adaptive Cooperative Intelligent Real-Time Control Architecture (SA-CIRCA). For self-adaptive software, deliberation scheduling is the problem of deciding what aspects of the artifact should be improved, what methods of improvement should be chosen, and how much time should be devoted to

Robert P. Goldman; David J. Musliner; Kurt D. Krebsbach

2001-01-01

350

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

351

COMPUTER-VIDEO METHOD EVALUATES REAL MOTION DATA IN REAL TIME FOR STUDENTS  

E-print Network

COMPUTER-VIDEO METHOD EVALUATES REAL MOTION DATA IN REAL TIME FOR STUDENTS Roman Dengler, Karl dimension. These devices, however, are·normally limited to one dimension. The video camera, on the other of information recorded by the video camera into useable, digital information. For this purpose, we devised

Zollman, Dean

352

IS TIME A REAL TIME? AN OVERVIEW OF TIME ONTOLOGY IN INFORMATICS  

E-print Network

Wit1], it was through the Jewish/Christian thought that the western world got its view of time. Anyhow of temporal issues came in with the birth of distributed computing systems, where the de nition of a global the eighties, it became increasingly relevant in many application elds, such as real-time control systems

Schreiber, Fabio A.

353

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 of a population of neurons to intended movement variables such as direction. However, since no data on real arm movement will be available prior to use of the prosthetic, and recent research has shown that neurons may

354

Dynamic Resource Migration for Multiparty RealTime  

E-print Network

Dynamic Resource Migration for Multiparty Real­Time Communication Riccardo Bettati \\Lambda and Amit mechanism to dynamically reallocate (``migrate'') resources without ad­ versely affecting the performance how dynamic resource migration is incorporated in the Tenet Scheme 2 protocols for multiparty real

Bettati, Riccardo

355

A Distributed Virtual Reality Prototype for Real Time GPS Data  

E-print Network

A Distributed Virtual Reality Prototype for Real Time GPS Data Roy Ladner1 , Larry Klos2 , Mahdi Abdelguerfi2 , Golden G. Richard, III2 , Beige Liu2 , Kevin Shaw1 1 Naval Research Laboratory, Stennis Space movements in the real world, which are captured from GPS transmissions and are reflected by the movement

Richard III, Golden G.

356

Model Reference Adaptive Control Framework for Real Time Traffic  

E-print Network

Model Reference Adaptive Control Framework for Real Time Traffic Management Under Emergency Evacuation Henry Liu Department of Civil Engineering University of Minnesota September 27, 2005 ITS Institute Focused on Evacuation Planning "If this is scenario X then follow plan x". Can not Predict Real World

Minnesota, University of

357

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

358

Performance evaluation of real-time carrier-phase GPS time transfer  

Microsoft Academic Search

A real-time GPS time transfer system was developed to measure the phase difference between clocks at the sub-nanosecond level. The relative performance of the system was assessed with other contemporary time transfer methods and several issues regarding real-time GPS time transfer were addressed, including the use of a sequential data processor and establishment of a real-time data link. By use

Seung Woo Lee; Jeongrae Kim

2009-01-01

359

Real-time and reliable human detection in clutter scene  

NASA Astrophysics Data System (ADS)

To solve the problem that traditional HOG approach for human detection can not achieve real-time detection due to its time-consuming detection, an efficient algorithm based on first segmentation then identify method for real-time human detection is proposed to achieve real-time human detection in clutter scene. Firstly, the ViBe algorithm is used to segment all possible human target regions quickly, and more accurate moving objects is obtained by using the YUV color space to eliminate the shadow; secondly, using the body geometry knowledge can help to found the valid human areas by screening the regions of interest; finally, linear support vector machine (SVM) classifier and HOG are applied to train for human body classifier, to achieve accurate positioning of human body's locations. The results of our comparative experiments demonstrated that the approach proposed can obtain high accuracy, good real-time performance and strong robustness.

Tan, Yumei; Luo, Xiaoshu; Xia, Haiying

2013-10-01

360

Real-time logo detection and tracking in video  

NASA Astrophysics Data System (ADS)

This paper presents a real-time implementation of a logo detection and tracking algorithm in video. The motivation of this work stems from applications on smart phones that require the detection of logos in real-time. For example, one application involves detecting company logos so that customers can easily get special offers in real-time. This algorithm uses a hybrid approach by initially running the Scale Invariant Feature Transform (SIFT) algorithm on the first frame in order to obtain the logo location and then by using an online calibration of color within the SIFT detected area in order to detect and track the logo in subsequent frames in a time efficient manner. The results obtained indicate that this hybrid approach allows robust logo detection and tracking to be achieved in real-time.

George, M.; Kehtarnavaz, N.; Rahman, M.; Carlsohn, M.

2010-05-01

361

Power efficient real-time disk scheduling  

Microsoft Academic Search

Hard-disk drive power consumption reduction methods focus mainly on increasing the amount of time the disk is in standby mode (disk spun down) by implementing aggressive data read- ahead and caching at the operating system and\\/or application level. However, these methods cannot be applied efficiently to systems with limited memory and high bit-rate requirements such as digital video recorders handling

Damien Le Moal; Donald Molaro; Jorge Campello

2009-01-01

362

Myrinet Real Time Protocol with flexible routing  

E-print Network

. a. Host Establishment Controller (HEC) b. Switch Establishment Controller (SEC) c. State Machines d. Control Messages e. MyRT Protocol with Flexible Routing B. Myrinet Control Program 1. Details of Myrinet Control Program 2. Dynamic Route... Management in the Myrinet Con- trol Program a. Route Modify Messages b. MCP to MCP Messages c. Details of Host Message Library . 3. Deployment on Local Myrinet Testbed . . IV EXPERIMENTS A. Connection Establishment Times B. Admission Probability V...

Kini, Savita

2012-06-07

363

Bending the Bolivian orocline in real time  

NASA Astrophysics Data System (ADS)

Global positioning system (GPS) data from the central Andes record vertical axis rotations that are consistently counterclockwise in Peru and Bolivia north of the bend in the mountain belt, and clockwise to the south in southern Bolivia, Argentina, and Chile. These geologically instantaneous rotations have the same sense as rotations that have accrued over millions of years and are recorded by paleomagnetic and geologic indicators. The change in sign of the rotation at both decadal and million-year time scales occurs across the axis of topographic symmetry that defines the Bolivian orocline. When extrapolated to a common time interval, the magnitudes of rotation from geologic features and from GPS are surprisingly similar, given that a significant part of the instantaneous deformation field is probably elastic and due to interseismic locking of the plate boundary. Some of the interseismic deformation field must reflect permanent deformation, and/or some of the current elastic deformation will be converted to upper-plate permanent deformation over time rather than be recovered by elastic rebound during interplate earthquakes. We suggest that the spatial patterns of the elastic and the permanent modes of bending are similar because they are driven by the same stress field.

Allmendinger, Richard W.; Smalley, Robert, Jr.; Bevis, Michael; Caprio, Holly; Brooks, Benjamin

2005-11-01

364

Aperiodic Task Scheduling for Hard Real-Time Systems  

Microsoft Academic Search

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

Brinkley Sprunt; Lui Sha; John P. Lehoczky

1989-01-01

365

Resource Reclaiming in Multiprocessor Real-Time Systems  

Microsoft Academic Search

Most real-time scheduling algorithms schedule tasks with regard to their worst casecomputation times. Resources reclaiming refers to the problem of utilizing the resourcesleft unused by a task when it executes in less than its worst case computation time, orwhen a task is deleted from the current schedule. Dynamic resource reclaiming algorithms that are effective, avoid any run time anomalies, and

Chia Shen; Krithi Ramamritham; John A. Stankovic

1993-01-01

366

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

367

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

368

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

369

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

370

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

371

Real-time communication in FDDI-based networks  

E-print Network

network with the synchronous transmission mode. This study addresses the issues in implementing real-time communications on an FDDI network using synchronous mode transmission, and guaranteeing the apphcation-to-application deadlines of multiple message...

Kumar, Amit Virendra

2012-06-07

372

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

373

Real-time data compression of broadcast video signals  

NASA Technical Reports Server (NTRS)

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

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

1991-01-01

374

Achieving Superior Plant Energy Performance Utilizing Real-time Data  

E-print Network

systematic methodology for understanding where energy is used and how to reduce it; and 2) achieving visibility into sufficiently granular real-time information on key performance indicators; 3) integrating new technology into overall corporate strategy...

Subramanya, S.

2010-01-01

375

Towards Real Time Optimal Auto-tuning of PID Controllers  

E-print Network

of the algorithms is completed on an embedded system with DSP hardware. These implementations are then tested against a large number of examples to determine both accuracy and applicability to real time systems. The major design constraint for application...

Hill, Aaron Jamison

2013-08-22

376

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

377

Sender sharing groups in real-time communication  

E-print Network

Distributed real-time systems require guaranteed ographics. communication, where guarantees may be in terms of a maximum delay, minimum bandwidth and so on. In order to be able to provide these guarantees to applications, resources must be allocated...

Narayanan, Vidya

2012-06-07

378

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

379

Cluster Computing for Embedded/Real-Time Systems  

NASA Technical Reports Server (NTRS)

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

Katz, D.; Kepner, J.

1999-01-01

380

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

381

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

382

A practical acceleration algorithm for real-time imaging  

E-print Network

A practical acceleration algorithm for real-time magnetic resonance imaging (MRI) is presented. Neither separate training scans nor embedded training samples are used. The Kalman filter based algorithm provides a fast and ...

Sumbul, Uygar

383

Spectral Texturing for Real-Time Applications Daniel R. Berger  

E-print Network

Spectral Texturing for Real-Time Applications Daniel R. Berger Max Planck Institute for Biological of the texture at all magnification levels. The textures themselves are low-pass filtered to such a degree

384

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

385

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

386

Distributed real-time model-based diagnosis  

NASA Technical Reports Server (NTRS)

This paper presents an approach to onboard anomaly diagnosis that combines the simplicity and real-time guarantee of a rule-based diagnosis system with the specification ease and coverage guarantees of a model-based diagnosis system.

Barrett, A. C.; Chung, S. H.

2003-01-01

387

REAL-TIME TRANSRECTAL ULTRASONOGRAPHY DURING LAPAROSCOPIC RADICAL PROSTATECTOMY  

Microsoft Academic Search

Purpose:We describe the technical aspects of real-time transrectal ultrasound (TRUS) monitoring and guidance during laparoscopic radical prostatectomy (LRP). Furthermore, we describe the TRUS visualized anatomy of periprostatic structures during LRP.

OSAMU UKIMURA; INDERBIR S. GILL; MIHIR M. DESAI; ANDREW P. STEINBERG; METE KILCILER; CHRISTOPHER S. NG; SIDNEY C. ABREU; MASSIMILIANO SPALIVIERO; ANUP P. RAMANI; JIHAD H. KAOUK; AKIHIRO KAWAUCHI; TSUNEHARU MIKI

2004-01-01

388

Real-Time Feynman Path Integral Realization of Instantons  

E-print Network

In Euclidean path integrals, quantum mechanical tunneling amplitudes are associated with instanton configurations. We explain how tunneling amplitudes are encoded in real-time Feynman path integrals. The essential steps are borrowed from Picard-Lefschetz theory and resurgence theory.

Cherman, Aleksey

2014-01-01

389

Real-Time Feynman Path Integral Realization of Instantons  

E-print Network

In Euclidean path integrals, quantum mechanical tunneling amplitudes are associated with instanton configurations. We explain how tunneling amplitudes are encoded in real-time Feynman path integrals. The essential steps are borrowed from Picard-Lefschetz theory and resurgence theory.

Aleksey Cherman; Mithat Unsal

2014-07-31

390

Real time control for NASA robotic gripper  

NASA Technical Reports Server (NTRS)

The ability to easily manipulate objects in a zero gravity environment will pay a key role in future space activities. Emphasis will be placed on robotic manipulation. This will serve to increase astronaut safety and utility in addition to several other benefits. The aim is to develop control laws for the zero gravity robotic end effectors. A hybrid force/position controller will be used. Sensory data available to the controller are obtained from an array of strain gauges and a linear potentiometer. Applying well known optimal control theoretical principles, the control which minimizes the transition time between positions is obtained. A robust force control scheme is developed which allows the desired holding force to be achieved smoothly without oscillation. In addition, an algorithm is found to determine contact force and contact location.

Salter, Carole A.; Baras, John S.

1990-01-01

391

Real time control for NASA robotic gripper  

NASA Technical Reports Server (NTRS)

Control laws (in some optimal sense) are being developed for the gripper/nut runner end effector. Control laws for the gripper and nut runner portions of the end effector may be developed independently since these two systems are decoupled. A hybrid force/position controller will be used for both the gripper and nut runner. The development of the gripper controller is explained. Sensory data available to the controller is obtained from an array of strain gages as well as a linear potentiometer. Applying well known optimal control theoretic principles, the control which minimizes the transition time between positions is obtained. In addition, a robust force control scheme is developed to contend with the strain gage drift caused by extreme temperature variations encountered in space.

Salter, Carole A.; Baras, John S.

1989-01-01

392

Real-Time Disk Scheduling Based on Urgent Group and Shortest Seek Time First  

Microsoft Academic Search

Real-time applications dealing with a large amount of data often require timely service of disk I\\/O requests. This paper presents a new real-time disk scheduling method called Urgent Group and Shortest Seek Time First(UG-SSTF) for soft real-time systems. According to this algorithm, the urgent group is formed by identifying urgent requests awaiting the disk service in a queue, among which

Kitae Hwang; Heonshik Shin

1993-01-01

393

A Real-Time Framework for Video Time and Pitch Scale Modification  

Microsoft Academic Search

A framework is presented which addresses the issues related to the real-time implementation of synchronized video and audio time-scale and pitch-scale modification algorithms. It allows for seamless real-time transition between continually varying, independent time-scale and pitch-scale parameters arising as a result of manual or automatic intervention. We illuminate the problems which arise in a real-time context as well as provide

Ivan Damnjanovic; Dan Barry; David Dorran; Joshua D. Reiss

2010-01-01

394

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

395

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

396

Applying Optimization Principle Patterns to Real-time ORBs  

Microsoft Academic Search

First-generation CORBA middleware was reasonably suc- cessful at meeting the demands of applications with best- effort quality of service (QoS) requirements. Supporting ap- plications with more stringent QoS requirements poses new challenges for next-generation real-time CORBA middleware, however. This paper provides three contributions to the de- sign and optimization of real-time CORBA middleware. First, we outline the challenges faced by

Irfan Pyarali; Carlos O'Ryan; Douglas Schmidt; Aniruddha Gokhale; Nanbor Wang; Vishal Kachroo

2000-01-01

397

Applying Optimization Principle Patterns to Design Real-Time ORBs  

Microsoft Academic Search

First-generation CORBA middleware was reasonably success- ful at meeting the demands of request\\/response applications with best-effort quality of service (QoS) requirements. Sup- porting applications with more stringent QoS requirements poses new challenges for next-generation real-time CORBA middleware, however. This paper provides three contributions to the design and optimization of real-time CORBA middle- ware. First, we outline the challenges faced by

Irfan Pyarali; Carlos O'ryan; Douglas C. Schmidt; Nanbor Wang; Vishal Kachroo; Aniruddha S. Gokhale

1999-01-01

398

Monitoring mineral wool production using real-time machine vision  

Microsoft Academic Search

This paper describes the development and use of a real-time machine vision system in the industrial production of mineral wool. Because of specific operating requirements and the very hostile environment the system employs unique hardware and software features.The main requirement is for real-time detection and control of the trajectory of molten rock as it falls onto a system of spinning

Francelj Trdic; Brane Sirok; Peter Ronald Bullen; David Richard Philpott

1999-01-01

399

Real Time Eyes Tracking and Classification for Driver Fatigue Detection  

Microsoft Academic Search

In this paper, we propose a vision-based real time algorithm for driver fatigue detection. Face and eyes of the driver are\\u000a first localized and then marked in every frame obtained from the video source. The eyes are tracked in real time using correlation\\u000a function with an automatically generated online template. The proposed algorithm can detect eyelids movement and can classify

M. Imran Khan; Atif Bin Mansoor

2008-01-01

400

Real-Time Optical Correlator Based On GaAs  

NASA Technical Reports Server (NTRS)

Apparatus performs correlation between input image and reference image in real time by means of degenerate four-wave mixing in photorefractive crystal, which serves as real-time holographic medium. Gallium arsenide chosen to be photorefractive material in this application because at frame rate and level of illumination used in experiments, offers adequate diffraction efficiency. Frame rates as high as 1,000 s to negative 1st power achievable.

Liu, Tsuen-Hsi; Cheng, Li-Jen

1992-01-01

401

Feedback-Controlled Adaptive Multiprocessor Real-Time Systems  

Microsoft Academic Search

Abstract We develop an adaptive feedback-controlled scheduling algorithm for changing,the processor shares of tasksóa process called reweightingóon,real-time multiprocessor,platforms. Our particular focus is reweighting schemes,that are deployed in environments in which tasks may frequently require signicant share changes. Prior work on enabling real-time adaptivity on multiprocessors has focused exclusively on scheduling algorithms that can enact needed adaptations. The algorithm proposed in

Aaron Block; Bj Orn Brandenburg; James H. Anderson; Stephen Quint

402

Semantic Twitter: Analyzing Tweets for Real-Time Event Notification  

Microsoft Academic Search

\\u000a Twitter, a popular microblog service, has received much attention recently. An important characteristic of Twitter is its\\u000a real-time nature. However, to date, integration of semantic processing and the real-time nature of Twitter has not been well\\u000a studied. As described herein, we propose an event notification system that monitors tweet (Twitter messages) and delivers\\u000a semantically relevant tweets if they meet a

Makoto Okazaki; Yutaka Matsuo

2011-01-01

403

Dynamic sprite-based real-time particle graphics  

Microsoft Academic Search

A challenging aspect of real-time infrared scene generation for the hardware-in-the-loop (HWIL) testing of infrared-guided weapon systems is the rendering of particle systems to present gaseous and particulate volumes. In this paper a simplified technique is described for generating real-time particle effects with high spatial and temporal fidelity by using many less primitives than traditional means. The technique is suitable

Timothy G. Sills; Owen M. Williams

2003-01-01

404

Real-time voice over packet-switched networks  

Microsoft Academic Search

We discuss the architecture and technical viability of transporting real-time voice over packet-switched networks such as the Internet. The value of integrating voice and data networks onto a common platform is well known. The telephony industry has proposed the ATM standard as a means of upgrading the Internet to provide both real-time and data services. In contrast, voice services may

Thomas J. Kostas; Michael S. Borella; I. Sidhu; G. M. Schuster; J. Grabiec; J. Mahler

1998-01-01

405

Real-time MVC viewer for free viewpoint navigation  

Microsoft Academic Search

A real-time MVC viewer for free-viewpoint navigation is demonstrated. MVC, a video coding standard for multi-view video, is an extension of the state-of-the-art H.264\\/AVC. Realizing parallel decoding and view synthesis is essential to develop real-time viewers. A new decoder architecture is introduced for the proposed viewer. In addition, a file format for MVC is introduced. View synthesis is performed entirely

Hideaki Kimata; Shinya Shimizu; Yutaka Kunita; Megumi Isogai; Kazuto Kamikura; Yoshiyuki Yashima

2008-01-01

406

Hybrid interconnection structures for real-time parallel processing  

NASA Technical Reports Server (NTRS)

The use of hybrid interconnection structures that combine link connections and bus connections for real-time parallel processing is discussed. Idealistic parallel computation models for two real-time computing applications are described with attention given to a tightly coupled network model for object tracking and a network model for image processing. Consideration is given to the following different interconnection structures: the crossbar, the hypercube, the circular linked array, and the bus array.

Kim, K. H.; Samson, John R., Jr.

1989-01-01

407

Congestion Control for Real-time Interactive Applications  

Microsoft Academic Search

It is well known that real-time multimedia applications pre- fer smooth and predictable throughput to a TCP-like abrupt sending rate change. The current release of VIC\\/RAT oper- ates just on top of the RTP\\/RTCP architecture over UDP protocol, not providing a fine-grained congestion control for its real-time interactive streaming flows. This may work well only if the application's codecs can

Soo-Hyun Choi

2008-01-01

408

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

409

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

410

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

411

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

412

Real-time video-based fire smoke detection system  

Microsoft Academic Search

A real-time video-based fire smoke detection method that can be incorporated with a automatic monitoring system for early alerts is proposed by this paper. The successive processing steps of our real-time algorithm are using the motion history segmentation algorithm to register the possible fire smoke position in a video and then analyze the spectral, spatial and temporal characteristics of the

Chao-Ching Ho; Tzu-Hsin Kuo

2009-01-01

413

Energy efficient scheduling techniques for real-time embedded systems  

E-print Network

ENERGY EFFICIENT SCHEDULING TECHNIQUES FOR REAL-TIME EMBEDDED SYSTEMS A Thesis by RAJESH BABU PRATHIPATI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE May 2004 Major Subject: Computer Science ENERGY EFFICIENT SCHEDULING TECHNIQUES FOR REAL-TIME EMBEDDED SYSTEMS A Thesis by RAJESH BABU PRATHIPATI Submitted to Texas A&M University in partial...

Prathipati, Rajesh Babu

2004-09-30

414

Quantitative TaqMan Real-Time PCR  

Microsoft Academic Search

\\u000a The invention of real-time polymerase chair reaction (PCR) has revolutionized the quantification of gene expression and DNA\\u000a copy number measurements. However, after the first documentation of real-time PCR in 1993 (1), it took several years for this method to become a mainstream tool. PCR generates DNA copies in an exponential way. As soon\\u000a as resources are exhausted, however, the so-called

Jörg Dötsch; Ellen Schoof; Wolfgang Rascher

415

Real-time NURBS interpolator: application to short linear segments  

Microsoft Academic Search

This study proposes the use of a real-time non-uniform rational B-spline (NURBS) interpolator with a look-ahead function to\\u000a handle numerous short linear segments. The short linear segments conforming to the continuous short block (CSB) criterion\\u000a can be fitted into NURBS curves in real time. A modified maximum feedrate equation based on the geometric characteristics\\u000a of the fitting curves and the

Jun-Bin Wang; Hong-Tzong Yau

2009-01-01

416

Learning to Act Using Real-Time Dynamic Programming  

Microsoft Academic Search

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

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

1995-01-01

417

Real-time laser holographic Interferometry for aerodynamics  

NASA Technical Reports Server (NTRS)

Recent developments in thermoplastic recording holograms and advancements in automated image digitalization and analysis make real-time laser holographic interferometry feasible for two-dimensional flows such as airfoil flows. Typical airfoil measurements would include airfoil presssure distributions, wake and boundary layer profiles, and flow field density contours. This paper addresses some of the problems and requirements of a real-time laser holographic interferometer.

Lee, George

1987-01-01

418

Real-time forest fire detection with wireless sensor networks  

Microsoft Academic Search

In this paper, we propose a wireless sensor network paradigm for real-time forest fire detection. The wireless sensor network can detect and forecast forest fire more promptly than the traditional satellite-based detection approach. This paper mainly describes the data collecting and processing in wireless sensor networks for real-time forest fire detection. A neural network method is applied to in-network data

Liyang Yu; Neng Wang; Xiaoqiao Meng

2005-01-01

419

Real Time CORBA-MMS for Embbeded Systems  

Microsoft Academic Search

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

E. Becquet

420

Real-time nonintrusive monitoring and prediction of driver fatigue  

Microsoft Academic Search

This paper describes a real-time online prototype driver-fatigue monitor. It uses remotely located charge-coupled-device cameras equipped with active infrared illuminators to acquire video images of the driver. Various visual cues that typically characterize the level of alertness of a person are extracted in real time and systematically combined to infer the fatigue level of the driver. The visual cues employed

Qiang Ji; Zhiwei Zhu; Peilin Lan

2004-01-01

421

REal-time local stereo matching using guided image filtering  

Microsoft Academic Search

Adaptive support weight algorithms represent the state-of­ the-art in local stereo matching. Their limitation is a high computational demand, which makes them unattractive for many (real-time) applications. To our knowledge, the algo­ rithm proposed in this paper is the first local method which is both fast (real-time) and produces results comparable to global algorithms. A key insight is that the

Asmaa Hosni; Michael BleyerI; Christoph Rhemann; Margrit Gelautz; Carsten Rother

2011-01-01

422

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

423

Research and application of embedded real-time operating system  

NASA Astrophysics Data System (ADS)

In this paper, based on the analysis of existing embedded real-time operating system, the architecture of an operating system is designed and implemented. The experimental results show that the design fully complies with the requirements of embedded real-time operating system, can achieve the purposes of reducing the complexity of embedded software design and improving the maintainability, reliability, flexibility. Therefore, this design program has high practical value.

Zhang, Bo

2013-03-01

424

Near real-time skin deformation mapping  

NASA Astrophysics Data System (ADS)

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

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

2013-02-01

425

Faraday Optical Rotation  

NSDL National Science Digital Library

In this experiment students measure the effects of a magnetic field on the polarization of light (laser beam) propagating through, or reflected from, a solid transparent medium. The effect can be explained in terms of a simple model that relates the "optical activity" of the medium to the applied magnetic field. Students learn about â¢Rotation of linearly polarized light by electromagnetic fields â¢Connection to Zeeman Effect â¢Atomic model of light propagation in dielectrics. Prof. Paul R. Berman of The University of Michigan, Ann Arbor, has recently published (March 2010) an American Journal of Physics article on three different calculations of the Optical Faraday Rotation (please see link below.) Students are strongly encouraged to study this article.

2010-03-25

426

The minus sign in Faraday’s law revisited  

NASA Astrophysics Data System (ADS)

By introducing the mathematical concept of orientation, the significance of the minus sign in Faraday’s law may be made clear to students with some knowledge of vector calculus. For many students, however, the traditional approach of treating the law as a relationship between positive scalars and of relying on Lenz’s law to provide the information on the direction of the induced electromotive force may be a preferable pedagogical practice.

O'Sullivan, Colm; Hurley, Donal

2013-01-01

427

A Scheduling Algorithm for Replicated Real-Time Tasks  

NASA Technical Reports Server (NTRS)

We present an algorithm for scheduling real-time periodic tasks on a multiprocessor system under fault-tolerant requirement. Our approach incorporates both the redundancy and masking technique and the imprecise computation model. Since the tasks in hard real-time systems have stringent timing constraints, the redundancy and masking technique are more appropriate than the rollback techniques which usually require extra time for error recovery. The imprecise computation model provides flexible functionality by trading off the quality of the result produced by a task with the amount of processing time required to produce it. It therefore permits the performance of a real-time system to degrade gracefully. We evaluate the algorithm by stochastic analysis and Monte Carlo simulations. The results show that the algorithm is resilient under hardware failures.

Yu, Albert C.; Lin, Kwei-Jay

1991-01-01

428

Optimal tester synthesis for real-time systems  

Microsoft Academic Search

Real-Time systems (RTS for short) are those systems whose behavior is time dependent. The correction of these systems does not only depend on the logical result of the computation but also on the time at which the inputs and outputs are observed. This paper proposes an approach to reduce the number of test cases considered while testing RTS. The proposed

Rachid Bouaziz; Ismaïl Berrada

2008-01-01

429

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

Microsoft Academic Search

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

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

430

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

Microsoft Academic Search

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

Sanjay Shakkottai; Alexander L. Stolyar

2001-01-01

431

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

Microsoft Academic Search

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

Peng Li; Binoy Ravindran; Syed Suhaib; Shahrooz Feizabadi

2004-01-01

432

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- formance in time-shared operating systems. Processes are assigned a weight which determines a share per

North Carolina at Chapel Hill, University of

433

Formal Description of Time Management in Real-Time Operating Systems  

Microsoft Academic Search

This paper describes the formal specification of the time management subsystem of a real-time operating system. Real-time process algebra (RTPA) is adopted to formally specify the system. The architecture, static behaviors, and dynamic behaviors of a CPU time manager are systematically specified that form an abstract model of the system. The formal specifications are implemented in C, on which the

Fabricio Rusu-banu; Yingxu Wang

2006-01-01

434

Faraday imaging at high temperatures  

DOEpatents

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

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

1997-01-01

435

Faraday imaging at high temperatures  

DOEpatents

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

Hackel, L.A.; Reichert, P.

1997-03-18

436

Sparse Faraday Rotation Measure Synthesis  

NASA Astrophysics Data System (ADS)

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

Andrecut, M.; Stil, J. M.; Taylor, A. R.

2012-02-01

437

SPARSE FARADAY ROTATION MEASURE SYNTHESIS  

SciTech Connect

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

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

2012-02-15

438

Real-time prediction of seismic ground motion (II): real-time correction of frequency-dependent site amplification factors  

NASA Astrophysics Data System (ADS)

In Part I, real-time estimation of wavefield using data assimilation and time evolutional prediction using Kirchhoff integral are discussed. For actual application of them in Earthquake Early Warning (EEW), site amplification factor should be corrected in real time. Site amplification is an important factor in addition to source and propagation factors which control the amplitude of seismic waves. The site factor has frequency dependence, and the amplification of high frequency waves is usually different from that of low frequency waves. In many EEW systems, the site amplification factor has been considered as scalar value ignoring the frequency dependence, in which amplification of PGA (or PGV) or increment of seismic intensity is used. The frequency-dependent site amplification factor has not yet fully taken into account. Data assimilation and Kirchhoff integral are powerful techniques for time evolutional prediction. For the application in EEW, frequency-dependent site amplification factors should be corrected in real time (inverse filtering) at observation points, and then should be applied in real time (simulation filtering) for evaluation of ground motion at a target point. A method is proposed in which the frequency dependent site factor can be corrected in real time. The frequency-dependent site factor is modeled by the linear system of the first and second order low-pass and high-pass filters. A causal recursive IIR filter in time domain is estimated from the linear system using bilinear transform and pre-warping methods of digital filtering technique. Using the causal filter, the site amplification factor is corrected in real time even when the site factor has strong frequency dependence. The causal filter enables us to predict the waveforms at target point when the seismic wave start to be observed at the observation point, if the site amplification factor of the target point relative to that of the observation point is known. Instead of rapid estimation of hypocentral location and magnitude, time evolutional prediction is a powerful method for real-time prediction of ground motion for EEW, which is applicable even for cases of strong rupture directivity and large source extent. Techniques of data assimilation and real time correction of site amplification factors will be applied for the time evolutional prediction. An example of the real time correction of the frequency-dependent site factors is presented using data from borehole seismometer (depth: 504m), and also using data of neighboring stations (distance: 28km) in the Kanto region, Japan. Waveforms of the target point are reproduced well from the waveform at the observation point by using the approach of the time evolutional prediction.

Hoshiba, M.

2013-05-01

439

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

Microsoft Academic Search

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

Kelvin Nilsen

2007-01-01

440

Faraday's law and seawater motion  

NASA Astrophysics Data System (ADS)

Using Faraday's law, one can illustrate how an electromotive force generator, directly utilizing seawater motion, works. The conceptual device proposed is rather simple in its components and can be built in any high school or college laboratory. The description of the way in which the device generates an electromotive force can be instructive not only when illustrating Faraday's law, but also in introducing alternative energy concepts.

De Luca, R.

2010-05-01

441

Guaranteed Response Times in a Hard-Real-Time Environment  

Microsoft Academic Search

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

Dennis W. Leinbaugh

1980-01-01

442

Real-Time Tropospheric Delay Estimation using IGS Products  

NASA Astrophysics Data System (ADS)

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

Stürze, Andrea; Liu, Sha; Söhne, Wolfgang

2014-05-01

443

Grasp: Tracing, Visualizing and Measuring the Behavior of Real-Time Systems  

E-print Network

--Understanding and validating the timing behavior of real-time systems is not trivial. Many real-time operating systems the development of various real-time extensions for the commercially available µC/OS-II real-time operating system a solution and identified several extensions required from the underlying real- time operating system

Bril, Reinder J.

444

Detection and Tracking of Driver's Hands in Real Time  

Microsoft Academic Search

\\u000a In this paper a complete driver’s hands detection and tracking system suitable for working in real time conditions has been\\u000a developed. The proposed system has been successfully tested in close-real world conditions in different scenarios on a very\\u000a realistic and immersive cabin truck simulator. A database of 24 video sequences monitoring the driving task in different circuits,\\u000a illumination conditions and

Raúl Crespo; Isaac Martín de Diego; Cristina Conde; Enrique Cabello

2010-01-01

445

Real-Time Multimodal Human-Avatar Interaction  

Microsoft Academic Search

This paper presents a novel real-time multimodal human-avatar interaction (RTM-HAI) framework with vision-based remote animation control (RAC). The framework is designed for both mobile and desktop avatar-based human-machine or human-human visual communications in real-world scenarios. Using 3-D components stored in the Java mobile 3-D (M3G) file format, the avatar models can be flexibly constructed and customized on the fly on

Yun Fu; Renxiang Li; Thomas S. Huang; Mike Danielsen

2008-01-01

446

Experimental demonstration of optical real-time data compressiona)  

NASA Astrophysics Data System (ADS)

We experimentally demonstrate a method for compressing the time-bandwidth product of analog signals in real-time. By performing self-adaptive stretch, this technology enables digitizers to capture waveforms beyond their bandwidth with digital data size being reduced at the same time. The compression is lossless and is achieved through a transformation of the signal's complex field, performed in the analog domain prior to digitization. For proof of concept experiments, we compress the modulation bandwidth of an optical signal by 500 times. At the same time, we reduce its modulation time-bandwidth product (i.e., the record length) by 2.73 times while achieving 16 dB power efficiency improvement in comparison to the case of using conventional dispersive Fourier transform. Dispersive data compression addresses the big data problem in real-time instruments and in optical communications.

Asghari, Mohammad H.; Jalali, Bahram

2014-03-01

447

A framework for building real-time expert systems  

NASA Technical Reports Server (NTRS)

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

Lee, S. Daniel

1991-01-01

448

An optimal real-time controller for vertical plasma stabilization  

E-print Network

Modern Tokamaks have evolved from the initial axisymmetric circular plasma shape to an elongated axisymmetric plasma shape that improves the energy confinement time and the triple product, which is a generally used figure of merit for the conditions needed for fusion reactor performance. However, the elongated plasma cross section introduces a vertical instability that demands a real-time feedback control loop to stabilize the plasma vertical position and velocity. At the Tokamak \\`a Configuration Variable (TCV) in-vessel poloidal field coils driven by fast switching power supplies are used to stabilize highly elongated plasmas. TCV plasma experiments have used a PID algorithm based controller to correct the plasma vertical position. In late 2013 experiments a new optimal real-time controller was tested improving the stability of the plasma. This contribution describes the new optimal real-time controller developed. The choice of the model that describes the plasma response to the actuators is discussed. The ...

Cruz, N; Coda, S; Duval, B P; Le, H B; Rodrigues, A P; Varandas, C A F; Correia, C M B A; Goncalves, B S

2014-01-01

449

Real-time alerts and reminders using information systems.  

PubMed

Adoption of information systems throughout the hospital environment has enabled the development of real-time physiologic alerts and clinician reminder systems. These clinical tools can be made available through the deployment of anesthesia information management systems (AIMS). Creating usable alert systems requires understanding of technical considerations. Various successful implementations are reviewed, encompassing cost reduction, improved revenue capture, timely antibiotic administration, and postoperative nausea and vomiting prophylaxis. Challenges to the widespread use of real-time alerts and reminders include AIMS adoption rates and the difficulty in choosing appropriate areas and approaches for information systems support. PMID:21871401

Wanderer, Jonathan P; Sandberg, Warren S; Ehrenfeld, Jesse M

2011-09-01

450

Real-time space system control with expert systems  

NASA Technical Reports Server (NTRS)

Many aspects of space system operations involve continuous control of real time processes. These processes include electrical power system monitoring, prelaunch and ongoing propulsion system health and maintenance, environmental and life support systems, space suit checkout, onboard manufacturing, and vehicle servicing including satellites, shuttles, orbital maneuvering vehicles, orbital transfer vehicles and remote teleoperators. Traditionally, monitoring of these critical real time processes has been done by trained human experts monitoring telemetry data. However, the long duration of future space missions and the high cost of crew time in space creates a powerful economic incentive for the development of highly autonomous knowledge based expert control procedures for these space systems.

Leinweber, David; Hawkinson, Lowell; Perry, John

1988-01-01

451

The improved broadband Real-Time Seismic Network in Romania  

NASA Astrophysics Data System (ADS)

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

Neagoe, C.; Ionescu, C.

2009-04-01

452

Spatio-temporal modeling for real-time ozone forecasting  

PubMed Central

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

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

2013-01-01

453

Real-time multispectral imaging application for poultry safety inspection  

NASA Astrophysics Data System (ADS)

The ARS imaging research group in Athens, Georgia has developed a real-time multispectral imaging system for fecal and ingesta contaminant detection on broiler carcasses for poultry industry. The industrial scale system includes a common aperture camera with three visible wavelength optical trim filters. This paper demonstrates calibration of common aperture multispectral imaging hardware and real-time image processing software. The software design, especially the Unified Modeling Language (UML) design approach was used to develop real-time image processing software for on-line application. The UML models including class, object, activity, sequence, and collaboration diagram were presented. Both hardware and software for a real-time fecal and ingesta contaminant detection were tested at the pilot-scale poultry processing line. The test results of industrial sacle real-time system showed that the multispectral imaging technique performed well for detecting fecal contaminants with a commercial processing speed (currently 140 birds per minute). The accuracy for the detection of fecal and ingesta contaminates was approximately 96%.

Park, Bosoon; Lawrence, Kurt C.; Windham, William R.; Snead, Matthew P.

2006-02-01

454

High performance real-time flight simulation at NASA Langley  

NASA Technical Reports Server (NTRS)

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

Cleveland, Jeff I., II

1994-01-01

455

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

NASA Astrophysics Data System (ADS)

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 and direction of resulting tsunamis. We will describe the prototype operational system being developed, highlighting the underlying GNSS technology. The key system components are: 1. The operational real-time estimation of site coordinates from hundreds of GPS sites using a precise point positioning (PPP) algorithm. This is accomplished by the NASA Global Differential GPS (GDGPS) System which, unlike other GPS algorithms such as real-time kinematic (RTK), is insensitive to motions of any ground-based reference stations in the vicinity of an event. 2. The application of data filtering and quality control techniques to the real-time site position time series in order to enhance the accurate retrieval of co-seismic site motions. 3. Usage of a Fingerprint inversion model (and potentially other models) for the rapid determination of the earthquake displacement field from the GPS-based records of ground motion at each station. 4. Detected and modeled seafloor displacements are then used within a special ocean dynamics model to determine tsunami source energy and scales, and estimate the tsunami propagation. 5. The resulting near-real-time information about earthquake source properties magnitude, type, and when relevant, magnitude and direction of the resulting tsunami, is then available to the responsible agencies to help in their decision-making processes. We will discuss the preliminary performance of the system, and analyze the aspects of GNSS infrastructure and technology that require further investments in order to realize the full potential of the GREAT Alert system and similar approaches for natural hazard monitoring.

Bar-Sever, Yoaz

2010-05-01

456

Using Timed TTCN-3 in Interoperability Testing for Real-Time Communication Systems  

Microsoft Academic Search

Interoperability testing is an important technique to ensure the quality of implementations of network communication software, and real-time protocol interoperability testing is an important issue in this area. TIMEDTTCN-3 is a real-time extension of test specification language TTCN-3. In this paper, test notations for real-time interoperability testing are studied. Test behavior trees are constructed from specifications of system under test

Zhiliang Wang; Jianping Wu; Xia Yin; Xingang Shi; Beihang Tian

2006-01-01

457

A hardware time manager implementation for the Xenomai real-time kernel of embedded Linux  

Microsoft Academic Search

Nowadays, the use of embedded operating systems in different embedded projects is subject to a tremendous growth. Embedded Linux is becoming one of those most popular EOSs due to its modularity, efficiency, reliability, and cost. One way to make it hard real-time is to include a real-time kernel like Xenomai. One of the key characteristics of a Real-Time Operating System

Pierre Olivier; Jalil Boukhobza

458

Adding PEP to Real-Time Distributed Commit Processing  

Microsoft Academic Search

One-phase commit protocols substantially reduce the overheads of transaction commit processing, making them attractive for incorporation in distributed real-time databases. A major obstacle, however, is that these pro- tocols significantly increase the occurrence of priority inversions. This arises from the cohorts of each distributed transaction being in a prepared state for extended periods of time, during which their data locks

Jayant R. Haritsa; Krithi Ramamrithamt

2000-01-01

459

QUALITY REQUIREMENTS FOR REAL-TIME SAFETY-CRITICAL SYSTEMS  

Microsoft Academic Search

This paper focuses on quality requirements for real-time safety-critical systems (RTSCS), discussing six relevant requirements, that is, timing, reliability, safety, security, usability, and maintainability. The requirements are defined, and strategies to achieve them are indicated. Copyright © 1997 Elsevier Science Ltd.

T. G. Kirner

1997-01-01

460

Optimized rapid prototyping for real-time embedded heterogeneous multiprocessors  

Microsoft Academic Search

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

Thierry Grandpierre; Christophe Lavarenne; Yves Sorel

1999-01-01

461

Incremental Satisfiability Counting for Real-Time Systems  

Microsoft Academic Search

Testing constraints for real-time systems are usually verified through the satisfiability of propositional formulae. In this paper, we propose an alternative where the verification of timing constraints can be done by counting the number of truth assignments instead of boolean satisfiability. This number can also tell us how \\

Stefan Andrei; Wei-ngan Chin

2004-01-01

462

Real Time Pedestrian Tracking using Thermal Infrared Imagery  

E-print Network

--pedestrian tracking; infrared images; particle filter; intensity-distance projection; histogram representation IReal Time Pedestrian Tracking using Thermal Infrared Imagery Jianfu Li 1. Key Laboratory@cqu.edu.cn Abstract--In the study, a real time pedestrian tracking algortithm is presented using thermal infrared

Del Moral , Pierre

463

A Real-Time Processor for the Hough Transform  

Microsoft Academic Search

The Hough transform method for recognition can cope effectively with noisy backgrounds and gaps in boundaries. However, long computation time and large memory requirements have prevented it from being used in real-time applications. An architecture devised to solve those problems, with a focus on detecting straight lines, is presented. Examples are given of the use of an experimental hardware model

Keishi Hanahara; Tsugito Maruyama; Takashi Uchiyama

1988-01-01

464

2013 UEC Tokyo. Real-time Mobile Food  

E-print Network

of Processing Time Extract SURF food region(bounding box) Adjust bounding box Estimate direction Only once 2013 UEC Tokyo. Real-time Mobile Food Recognition System Yoshiyuki Kawano and Keiji Yanai. · Recording of food habits has become popular. ­ by using PC or mobile phone ­ quite troublesome task. · Rapid

Yanai, Keiji

465

Compositional Semantics for Real-time Distributed Computing  

Microsoft Academic Search

We give a compositional denotational semantics for a real-time distributed language, based on the linear history semantics for CSP of Francez et al. Concurrent execution is not modelled by interleaving but by an extension of the maximal parallelism model of Salwicki, that allows the modelling of transmission time for communications. The importance of constructing a semantics (and in general a

Ron Koymans; R. K. Shyamasundar; Willem P. De Roever; Rob Gerth; S. Arun-kumar

1985-01-01

466

Real-time pair-feeding of animals  

NASA Technical Reports Server (NTRS)

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

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

1972-01-01

467

Model Predictive Control for Real-Time Irrigation Scheduling  

E-print Network

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

Halgamuge, Malka N.

468

EMBEDDED HARD REAL-TIME SOFTWARE SYNTHESIS CONSIDERING DISPATCHER OVERHEADS  

Microsoft Academic Search

Due to the increasing complexity and diversity of requirements, embedded software has become much harder to design. For instance, since several applications demand safety properties, the correctness and timeliness verification is an issue to be concerned. Usually, complex embedded real-time systems rely on specialized operating system kernels. However, operating systems may introduce significant overheads in execution time as well as

Raimundo Barreto; Eduardo Tavares; Paulo Maciel; Marília Neves; Meuse Oliveira Jr; Leonardo Amorim; Arthur Bessa; Ricardo Lima

469

Real-time signal processing for fetal heart rate monitoring  

Microsoft Academic Search

An algorithm based on digital filtering, adaptive thresholding, statistical properties in the time domain, and differencing of local maxima and minima has been developed for the simultaneous measurement of the fetal and maternal heart rates from the maternal abdominal electrocardiogram during pregnancy and labor for ambulatory monitoring. A microcontroller-based system has been used to implement the algorithm in real-time. A

M. I. Ibrahimy; F. Ahmed; M. A. M. Ali; E. Zahedi

2003-01-01

470

Markovian real-time adaptive control of signal systems  

Microsoft Academic Search

An approach to real-time control of a network of signalized intersections is proposed based on a discrete time, stationary, Markov control model (also known as Markov decision process or Markov dynamic programming). The approach incorporates microscopic simulation of actuated controller output signals in response to probabilistic forecasts of individual vehicle actuations at downstream inductance loop detectors derived from a macroscopic

W. W. Recker; B. V. Ramanathan; X.-H. Yu; M. G. McNally

1995-01-01

471

Interrupt Synchronization Lock for Real-time Operating Systems  

Microsoft Academic Search

One of the fundamental design decisions in an operating system is how to handle coordination between synchronous and asynchronous event handlers, especially handling the asynchronous interrupts. Interrupt synchronization is critical for real-time operating systems to increase system performance and reduce the interrupt response time. This paper proposes an interrupt synchronization lock (ISLock) technology to synchronize the interrupts without masking. Experimental

Huaidong Shi; Ming Cai; Jinxiang Dong

2006-01-01

472

Real-time operating systems for multimedia processing  

Microsoft Academic Search

Real-time DSP operating systems have recently appeared in several commercial products that integrate multimedia processing into PCs. The DSP OSs, which run on DSP subsystems integrated on PC adapter cards, include admission control capabilities to ensure that timing guarantees are met and sufficient resources are available to handle the processing demands of a given mix of applications. Admission control is

Daniel I. Katcher; Kevin A. Kettler; Jay K. Strosnider

1995-01-01

473

Real-Time Selective Harmonic Minimization in Cascaded Multilevel Inverters  

E-print Network

4302 Real-Time Selective Harmonic Minimization in Cascaded Multilevel Inverters with Varying DC-level cascaded multilevel inverter with separate DC sources will be presented. As opposed to previous research in this area, the DC sources feeding the multilevel inverter are considered to be varying in time

Tolbert, Leon M.

474

Composition and Refinement of Discrete Real-Time Systems  

E-print Network

quantitative timing constraints. This article presents a structured compositional design method for discrete a structured compositional design method for discrete real-time systems that can be used to combat of model-checking and simulation. The design method is illus- trated using a reactor shutdown system

Ostroff, Jonathan S.

475

Building Influenza Surveillance Pyramids in Near Real Time, Australia  

PubMed Central

A timely measure of circulating influenza virus severity has been elusive. Flutracking, the Australian online influenza-like illness surveillance system, was used to construct a surveillance pyramid in near real time for 2011/2012 participants and demonstrated a striking difference between years. Such pyramids will facilitate rapid estimation of attack rates and disease severity. PMID:24207165

Carlson, Sandra J.; Butler, Michelle T.; Elvidge, Elissa; Durrheim, David N.

2013-01-01

476

Real-Time Task Scheduling under Thermal Constraints  

E-print Network

the response times of aperiodic jobs while guaranteeing both the thermal safety of the system and the schedulability of the real-time tasks. The two proposed speed control algorithms are examples of so-called proactive schemes, since they rely on a prediction...

Ahn, Youngwoo

2010-10-12

477

UCSF Shuttle GPS coming May 1, 2013 View real-time shuttle arrival times on your  

E-print Network

real-time arrival predictions via phone, cell phone, or SMT (Text) messaging. · Obtain NextBus alerts UCSF Shuttle GPS coming May 1, 2013 View real-time shuttle arrival times on your phone students, faculty, staff, patients and affiliates will be able use the latest GPS technology to view, track

Yamamoto, Keith

478

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

E-print Network

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

Boyer, Edmond

479

Ballistic and diffusive dynamics in a two-dimensional ideal gas of macroscopic chaotic Faraday waves.  

PubMed

We have constructed a macroscopic driven system of chaotic Faraday waves whose statistical mechanics, we find, are surprisingly simple, mimicking those of a thermal gas. We use real-time tracking of a single floating probe, energy equipartition, and the Stokes-Einstein relation to define and measure a pseudotemperature and diffusion constant and then self-consistently determine a coefficient of viscous friction for a test particle in this pseudothermal gas. Because of its simplicity, this system can serve as a model for direct experimental investigation of nonequilibrium statistical mechanics, much as the ideal gas epitomizes equilibrium statistical mechanics. PMID:24827228

Welch, Kyle J; Hastings-Hauss, Isaac; Parthasarathy, Raghuveer; Corwin, Eric I

2014-04-01

480

Toward real-time performance benchmarks for Ada  

NASA Technical Reports Server (NTRS)

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

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

1986-01-01

481

Estimating the latent time of fault detection in finite automaton tested in real time  

Microsoft Academic Search

The notions of potential and real latent times of fault detection in finite automata were introduced. The potential latent\\u000a time is the minimal theoretical time of automaton fault detection, the real time is defined as the time of fault manifestation\\u000a at a certain point. A method for determination of the statistical characteristics of both times for the automaton tested in

R. Goot; I. Levin

2008-01-01

482

Innovations within the Altair real-time wavefront reconstructor  

NASA Astrophysics Data System (ADS)

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 and subtraction of invisible modes on the deformable mirror, and the blending of tip, tilt and focus from the on instrument wavefront sensors (which exist on all facility Gemini instruments). These associated support tasks are critically important to ensure that the system always runs with an optimal bandwidth and produce stable images with no artefacts such as a waffle pattern or residual non-common path errors. We present the original algorithm that we have developed for the centroid gain estimate and discuss how it is efficiently and conveniently implemented on the hard real-time processor.

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

2004-10-01

483

Continuous real-time water information: an important Kansas resource  

USGS Publications Warehouse

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

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

2014-01-01

484

Real-time simulations for automated rendezvous and capture  

NASA Technical Reports Server (NTRS)

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

Cuseo, John A.

1991-01-01

485

Real-time structured light intraoral 3D measurement pipeline  

NASA Astrophysics Data System (ADS)

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

Gheorghe, Radu; Tchouprakov, Andrei; Sokolov, Roman

2013-02-01

486

Real-Time Parameter Estimation in the Frequency Domain  

NASA Technical Reports Server (NTRS)

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

Morelli, Eugene A.

2000-01-01

487

Real-time experiment interface for biological control applications.  

PubMed

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

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

2010-01-01

488

Single-protein nanomechanical mass spectrometry in real time  

PubMed Central

Nanoelectromechanical systems (NEMS) resonators can detect mass with exceptional sensitivity. Previously, mass spectra from several hundred adsorption events were assembled in NEMS-based mass spectrometry using statistical analysis. Here, we report the first realization of single-molecule NEMS-based mass spectrometry in real time. As each molecule in the sample adsorbs upon the NEMS resonator, its mass and the position-of-adsorption are determined by continuously tracking two driven vibrational modes of the device. We demonstrate the potential of multimode NEMS-based mass spectrometry by analyzing IgM antibody complexes in real-time. NEMS-MS is a unique and promising new form of mass spectrometry: it can resolve neutral species, provides resolving power that increases markedly for very large masses, and allows acquisition of spectra, molecule-by-molecule, in real-time. PMID:22922541

Hanay, M.S.; Kelber, S.; Naik, A.K.; Chi, D.; Hentz, S.; Bullard, E.C.; Colinet, E.; Duraffourg, L.; Roukes, M.L.

2012-01-01

489

Test applications for heterogeneous real-time network testbed  

SciTech Connect

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

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

1994-07-01

490

Real-time development system for image processing engines  

NASA Astrophysics Data System (ADS)

Certain feedback loop based algorithms contained in an image processing engine, such as auto white balance, auto exposure or auto focus, are best designed and evaluated within a real-time framework due to strong requirements of close study of the dynamics present. Furthermore, the development process entails the usual flexibility associated with any software module implementation, such as the ability to dump debugging information or placement of break points in the code. In addition, the end deployment platform is not usually available during the design process, while tuning of the above mentioned algorithms must encompass particularities of each individual target sensor. We explore in this paper a real-time hardware-software solution that addresses all the requirements mentioned before and functions on a non-real time operating system (Windows). Moreover we exemplify and quantify the hard deadlines required by such a feedback control loop algorithm and illustrate how they are supported in our implementation.

Goma, Sergio; Gheorghe, Radu; Aleksic, Milivoje

2009-02-01

491

Real-time Experiment Interface for Biological Control Applications  

PubMed Central

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

Lin, Risa J.; Bettencourt, Jonathan; White, John A.; Christini, David J.; Butera, Robert J.

2013-01-01

492

INTEGRATION FOR REAL-TIME CORBA INTO AN EXISTING DISTRIBUTED PLANNING APPLICATION  

E-print Network

planning application running on top of Real-time operating system. The test indicated that the model for middleware interoperability. It includes incorporation of the real-time CORBA system developed by the real-time developed by real-time lab at URI is easy to be incorporate into non-real-time system and it also correctly

Rhode Island, University of

493

An approach to a real-time distribution system  

NASA Technical Reports Server (NTRS)

The requirements of a real-time data distribution system are to provide fast, reliable delivery of data from source to destination with little or no impact to the data source. In this particular case, the data sources are inside an operational environment, the Mission Control Center (MCC), and any workstation receiving data directly from the operational computer must conform to the software standards of the MCC. In order to supply data to development workstations outside of the MCC, it is necessary to use gateway computers that prevent unauthorized data transfer back to the operational computers. Many software programs produced on the development workstations are targeted for real-time operation. Therefore, these programs must migrate from the development workstation to the operational workstation. It is yet another requirement for the Data Distribution System to ensure smooth transition of the data interfaces for the application developers. A standard data interface model has already been set up for the operational environment, so the interface between the distribution system and the application software was developed to match that model as closely as possible. The system as a whole therefore allows the rapid development of real-time applications without impacting the data sources. In summary, this approach to a real-time data distribution system provides development users outside of the MCC with an interface to MCC real-time data sources. In addition, the data interface was developed with a flexible and portable software design. This design allows for the smooth transition of new real-time applications to the MCC operational environment.

Kittle, Frank P., Jr.; Paddock, Eddie J.; Pocklington, Tony; Wang, Lui

1990-01-01

494

New real time needle segmentation technique using grayscale Hough transformation  

NASA Astrophysics Data System (ADS)

Real-time needle segmentation and tracking is very important in image-guided surgery, biopsy, and therapy. In this paper, we described an automated technique to provide real-time needle segmentation from a sequence of 2-D ultrasound images for the use of guidance of a needle to the target in soft tissues. The Hough transform is used to find straight lines or analytic curves in binary image. Hough transform is applied usually to binary images. Hence one needs to convert, initially, the gray level image to a binary one (through thresholding, edge detection, or thinning) in order to apply the HT. While in the process of binarization, some information about line segments in the image may be lost when an inappropriate threshold is used. Gray-Scale Hough Transform can detect the line without binarization. Unfortunately, its high computational cost often prevents it from being applied in real-time applications without the help of specially designed hardware. In this paper, we proposed a needle segmentation technique based on a real-time gray-scale Hough transform. It is composed of an improved Gray Hough Transformation and a coarse-fine search strategy. Furthermore, the RTGHT (Real-Time Gray-Scale Hough Transform) technique is evaluated by patient breast biopsy images. Experiments with patient breast biopsy ultrasound (US) image sequences showed that our approach can segment the biopsy needle in real time (i.e., less than 60 ms) with the angular rms error of about 1° and the position rms error of about 0.5 mm an affordable PC computer without the help of specially designed hardware.

Qiu, Wu; Zhou, Hua; Ding, Mingyue; Zhang, Songgeng

2007-12-01

495

Simultaneous real-time monitoring of multiple cortical systems  

NASA Astrophysics Data System (ADS)

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

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

2014-10-01

496

Dynamic real-time deformations using space & time adaptive sampling  

Microsoft Academic Search

This paper presents a robust, adaptive method for animating dynamic visco-elastic deformable objects that provides a guaranteed frame rate. Our approach uses a novel automatic space and time adaptive level of detail technique, in combination with a large-displacement (Green) strain tensor formulation. The body is partitioned in a non-nested multiresolution hierarchy of tetrahedral meshes. The local resolution is determined by

Gilles Debunne; Mathieu Desbrun; Marie-Paule Cani; Alan H. Barr

2001-01-01

497

Real-time nondestructive imaging with THz waves  

NASA Astrophysics Data System (ADS)

We present a real-time imaging measurement in the terahertz (THz) frequency region. The dynamic subtraction technique is used to reduce long-term optical background drift. The reflective images of two targets, a Nikon camera's lens cap and a plastic toy gun, are obtained. For the lens cap, the image data were processed to be false-color images. For the toy gun, we show that even under an optically opaque canvas bag, a clear terahertz image is obtained. It is shown that terahertz real-time imaging can be used to nondestructively detect concealed objects.

Zhang, LiangLiang; Karpowicz, Nick; Zhang, CunLin; Zhao, YueJin; Zhang, XiCheng

2008-03-01

498

Terahertz real-time imaging for nondestructive detection  

NASA Astrophysics Data System (ADS)

We present a real time imaging measurement in the terahertz (THz) frequency region. The dynamic subtraction technique is used to reduce long-term optical background drift. The reflective images of two targets, a Nikon camera's lens cap and a plastic toy gun, are obtained. For the lens cap, the image data were processed to be false color images. For the toy gun, we show that even under an optically opaque canvas bag, a clear terahertz image is obtained. It is shown that terahertz real time imaging can be used to nondestructively detect concealed objects.

Zhang, LiangLiang; Karpowicz, Nick; Zhang, CunLin; Zhao, YueJin; Zhang, XiCheng

2008-03-01

499

Real-Time, High-Frequency QRS Electrocardiograph  

NASA Technical Reports Server (NTRS)

An electronic system that performs real-time analysis of the low-amplitude, high-frequency, ordinarily invisible components of the QRS portion of an electrocardiographic signal in real time has been developed. Whereas the signals readily visible on a conventional electrocardiogram (ECG) have amplitudes of the order of a millivolt and are characterized by frequencies <100 Hz, the ordinarily invisible components have amplitudes in the microvolt range and are characterized by frequencies from about 150 to about 250 Hz. Deviations of these high-frequency components from a normal pattern can be indicative of myocardial ischemia or myocardial infarction

Schlegel, Todd T.; DePalma, Jude L.; Moradi, Saeed

2003-01-01

500

Real-Time Multiprocessor Programming Language (RTMPL) user's manual  

NASA Technical Reports Server (NTRS)

A real-time multiprocessor programming language (RTMPL) has been developed to provide for high-order programming of real-time simulations on systems of distributed computers. RTMPL is a structured, engineering-oriented language. The RTMPL utility supports a variety of multiprocessor configurations and types by generating assembly language programs according to user-specified targeting information. Many programming functions are assumed by the utility (e.g., data transfer and scaling) to reduce the programming chore. This manual describes RTMPL from a user's viewpoint. Source generation, applications, utility operation, and utility output are detailed. An example simulation is generated to illustrate many RTMPL features.

Arpasi, D. J.

1985-01-01