Sample records for real time faraday

  1. Faraday Waves under Time-Reversed Excitation

    NASA Astrophysics Data System (ADS)

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

    2013-03-01

    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 , Phys. Rev. E 78, 036218 (2008)PLEEE81539-3755]. 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.

  2. Real Time Crises: New Real Time Tensions

    E-print Network

    Mumby, Peter J.

    Real Time Crises: New Real Time Tensions NikGowing Shaping the Future Lecture For ten years Nik 262359 or e.a.hull@exeter.ac.uk Nik Gowing Real Time Crises: New Real Time Tensions Shaping the Future in newsrooms, governments, military commands and corporate organisations in a time of crisis. To reserve your

  3. Real-time CORBA

    Microsoft Academic Search

    Victor Fay Wolfe; Lisa Cingiser Dipippo; Roman Ginis; Michael Squadrito; Steven Wohlever; Igor Zykh; Russell Johnston

    1997-01-01

    This paper describes the requirements for real-timeextensions to the CORBA standard, which arebeingdeveloped by the Object Management Group's SpecialInterest Group on Real-Time CORBA. The paper alsosurveys e#orts that are developing Real-Time CORBAsystems. It provides a more detailed description of thedynamic Real-Time CORBA system being developedatthe US Navy's NRaD facilities and at the Universityof Rhode Island.1

  4. Real-Time Simulation

    NASA Technical Reports Server (NTRS)

    1997-01-01

    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.

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

    Microsoft Academic Search

    M Szczerbi?ski

    2000-01-01

    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

  6. [Real time quantitative PCR].

    PubMed

    Kim, D W

    2001-04-21

    So far, quantitative techniques, such as PCR and FISH, have been used to detect of DNA and RNA. However, it is difficult to measure and compare the exact amount of amplified products with the results of endpoint analysis in conventional PCR techniques. Theoretically, there is a quantitative relationship between amount of starting target sequence and amount of PCR product at any given cycle. The development of real-time quantitative PCR (RQ-PCR) has eliminated the variability associated with conventional quantitative PCR, thus allowing the routine and reliable quantitation of PCR products. Detection of fluorescence during the thermal cycling process can be performed using iCycler(Bio-Rad), the GeneAmp 5700 or 7700(ABI-PRISM), and Light-Cycler(Roche). Two fluorogenic probes are available for use on real time quantitation. The fluorogenic 5'-nuclease assay(Taqman method) uses a fluorogenic probe to enable the detection of a sequence specific PCR product. Fluorogenic probe is incorporated with the reporter dye on the 5' end and the quencher on the 3' end. The second method uses SYBR Green I dye which is a highly specific double-stranded DNA binding dye. Real-time PCR is able to be possible exact quantitation of DNA and RNA much more precise and reproducible because it is based on CT values acquired during the exponential phase of PCR rather than endpoint. In this review, the detail protocol of real time quantitative PCR technique will be introduced and our recently developed system for exact quantitation of BCR-ABL fusion gene in CML is going to be described. PMID:11708318

  7. Real time SAR processing

    NASA Technical Reports Server (NTRS)

    Premkumar, A. B.; Purviance, J. E.

    1990-01-01

    A simplified model for the SAR imaging problem is presented. The model is based on the geometry of the SAR system. Using this model an expression for the entire phase history of the received SAR signal is formulated. From the phase history, it is shown that the range and the azimuth coordinates for a point target image can be obtained by processing the phase information during the intrapulse and interpulse periods respectively. An architecture for a VLSI implementation for the SAR signal processor is presented which generates images in real time. The architecture uses a small number of chips, a new correlation processor, and an efficient azimuth correlation process.

  8. Real-Time Operating Systems

    Microsoft Academic Search

    Bruno Bouyssounouse; Joseph Sifakis

    \\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

  9. Oceanographic Real-Time System

    E-print Network

    Physical Oceanographic Real-Time System (PORTS® ) www.tidesandcurrents.noaa.gov/ports a day increases. Center for Operational Oceanographic Products and Services (CO-OPS) Physical Oceanographic Real-Time and Services (CO-OPS), part of NOAA's National Ocean Service, developed the Physical Oceanographic Real-Time

  10. Real-time adaptive A

    Microsoft Academic Search

    Sven Koenig; Maxim Likhachev

    2006-01-01

    Characters in real-time computer games need 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 between A* searches. We then use this technique to develop a novel real-time heuristic search method, called

  11. Real time polarimetric dehazing.

    PubMed

    Mudge, Jason; Virgen, Miguel

    2013-03-20

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

  12. Real Time Streaming Protocol (RTSP)

    Microsoft Academic Search

    H. Schulzrinne; A. Rao; R. Lanphier

    1998-01-01

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

  13. Real-Time Transport Protocol

    Microsoft Academic Search

    Juhana Mattila

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

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

    E-print Network

    Cheng, Albert M. K.

    Translating Real-Time UML Timing Constraints into Real-Time Logic Formulas Gowri Aruchamy and Albert Mo Kim Cheng Real-Time Systems Laboratory Department of Computer Science University of Houston Modeling, Real-Time Systems, Timing Constraints, Verification, RTL Abstract Real-time software development

  15. Real time search user behavior

    Microsoft Academic Search

    Bernard J. Jansen; Gerry Campbell; Matthew Gregg

    2010-01-01

    Real time search is an increasingly important area of information seeking on the Web. In this research, we analyze 1,005,296 user interactions with a real time search engine over a 190 day period. We investigate aggregate usage of the search engine, such as number of users, queries, and terms. We also investigate the structure of queries and terms submitted by

  16. Real-time vision systems

    SciTech Connect

    Johnson, R.; Hernandez, J.E.; Lu, Shin-yee [Lawrence Livermore National Lab., CA (United States)

    1994-11-15

    Many industrial and defence applications require an ability to make instantaneous decisions based on sensor input of a time varying process. Such systems are referred to as `real-time systems` because they process and act on data as it occurs in time. When a vision sensor is used in a real-time system, the processing demands can be quite substantial, with typical data rates of 10-20 million samples per second. A real-time Machine Vision Laboratory (MVL) was established in FY94 to extend our years of experience in developing computer vision algorithms to include the development and implementation of real-time vision systems. The laboratory is equipped with a variety of hardware components, including Datacube image acquisition and processing boards, a Sun workstation, and several different types of CCD cameras, including monochrome and color area cameras and analog and digital line-scan cameras. The equipment is reconfigurable for prototyping different applications. This facility has been used to support several programs at LLNL, including O Division`s Peacemaker and Deadeye Projects as well as the CRADA with the U.S. Textile Industry, CAFE (Computer Aided Fabric Inspection). To date, we have successfully demonstrated several real-time applications: bullet tracking, stereo tracking and ranging, and web inspection. This work has been documented in the ongoing development of a real-time software library.

  17. Real-time software receiver

    NASA Technical Reports Server (NTRS)

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

    2007-01-01

    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.

  18. Real-time software receiver

    NASA Technical Reports Server (NTRS)

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

    2006-01-01

    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.

  19. Real-Time Synchronization in Real-Time Mach

    Microsoft Academic Search

    Tatsuo Nakajima; Hideyuki Tokuda

    The correctness of a real-time program should be ensured by both the results of computation and the time at which the results are produced. In the program, predictabil ity and analyzability will become important properties for ensuring their correctness. A synchronization facility plays an imp ortant role for managing the contention and the cooperation among concurrent activities so that we

  20. EECE 353 -Real Time Systems Sherif Abdelwahed

    E-print Network

    Abdelwahed, Sherif

    EECE 353 - Real Time Systems Sherif Abdelwahed Institute for Software Integrated Systems Vanderbilt University Spring 2007 #12;Part I Introduction to Real Time Systems #12;Real-time Systems Definition Real-time. Real-time embedded systems typically control the environment in which they operate; failure to control

  1. Real-time squared: A real-time data set for real-time GDP forecasting

    Microsoft Academic Search

    Roberto Golinelli; Giuseppe Parigi

    2008-01-01

    This paper uses real-time data to mimic real-time GDP forecasting activity. Through automatic searches for the best indicators for predicting GDP one and four steps ahead, we compare the out-of-sample forecasting performance of adaptive models using different data vintages, and produce three main findings. First, despite data revisions, the forecasting performance of models with indicators is better, but this advantage

  2. HEVC real-time decoding

    NASA Astrophysics Data System (ADS)

    Bross, Benjamin; Alvarez-Mesa, Mauricio; George, Valeri; Chi, Chi Ching; Mayer, Tobias; Juurlink, Ben; Schierl, Thomas

    2013-09-01

    The new High Efficiency Video Coding Standard (HEVC) was finalized in January 2013. Compared to its predecessor H.264 / MPEG4-AVC, this new international standard is able to reduce the bitrate by 50% for the same subjective video quality. This paper investigates decoder optimizations that are needed to achieve HEVC real-time software decoding on a mobile processor. It is shown that HEVC real-time decoding up to high definition video is feasible using instruction extensions of the processor while decoding 4K ultra high definition video in real-time requires additional parallel processing. For parallel processing, a picture-level parallel approach has been chosen because it is generic and does not require bitstreams with special indication.

  3. Real-time procedural textures

    Microsoft Academic Search

    John Rhoades; Greg Turk; Andrew Bell; Andrei State; Ulrich Neumann; Amitabh Varshney

    1992-01-01

    We describe a software system on the Pixel-Planes 5 graphics engine that displays user-defined antialiased procedural textures at rates of about 30 frames per second for use in real- time graphics applications. Our system allows a user to create textures that can modulate both diffuse and specular color, the sharpness of specular highlights, the amount of transparency and the surface

  4. Real-Time Topometric Localization

    Microsoft Academic Search

    Takeo Kanade

    2012-01-01

    Autonomous vehicles must be capable of localizing even in GPS denied situations. In this paper, we propose a real- time method to localize a vehicle along a route using visual im- agery or range information. Our approach is an implementation of topometric localization, which combines the robustness of topological localization with the geometric accuracy of metric methods. We construct a

  5. Real Time Sonic Boom Display

    NASA Technical Reports Server (NTRS)

    Haering, Ed

    2014-01-01

    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.

  6. Synchronized real-time networks

    Microsoft Academic Search

    Christof Brandauer; Peter Dorfinger; Vinod Kone

    This paper discusses an approach for coupling local real- time networks over an IP core network. The proposed service class provides deterministic guarantees on delay and jitter. To realize this, synchronized transmission schedules are employed in the access areas of the network. The schedule precludes re- source contention among the flows and enables a conflict free transmission at the IP

  7. Clinical virology in real time

    Microsoft Academic Search

    Hubert G. M Niesters

    2002-01-01

    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

  8. Arnold Schwarzenegger REAL-TIME GRID RELIABILITY

    E-print Network

    Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT California ISO Real Laboratory Consortium for Electric Reliability Technology Solutions APPENDIXC October 2008 CEC-500 (VSA) prototype to monitor system voltage conditions and provide real time dispatchers with reliability

  9. In situ Hall-effect system for real-time electron-irradiation studies

    Microsoft Academic Search

    B. S. Ziebro; D. C. Look; J. W. Hemsky; W. Rice

    1990-01-01

    This paper describes a system capable of taking in situ real-time Hall-effect measurements during electron-irradiation studies. The experimental setup consists of an aluminum tube, a Faraday-cup assembly which slides into the tube, and an automated Hall-effect system with a small powerful rare-earth magnet, which is the key element of the system. Using this system, high-resolution electron concentration and mobility versus

  10. Real-Time PCR Dean Fraga,1

    E-print Network

    Jones, Michelle

    10 UNIT 10.3 Real-Time PCR Dean Fraga,1 Tea Meulia,2 and Steven Fenster3 1 College of Wooster, Ashland, Ohio OVERVIEW AND PRINCIPLES The real-time polymerase chain reaction (real-time PCR) is a recent since (Higuchi et al., 1992, 1993). Real-time PCR allows precise quantification of specific nucleic

  11. Design Methods For Real-Time

    E-print Network

    Mills, Kevin

    Design Methods For Real-Time Systems In Ada Kevin L. Mills CS 619 July 21, 1993 #12;Design Methods For Real-Time Systems In Ada Whether in commercial or military applications, no real-time system can simply, and then to an identification and specification of system components. For real-time systems, a design method must help identify

  12. Real time statistical field theory

    E-print Network

    M. E. Carrington; T. Fugleberg; D. S. Irvine; D. Pickering

    2006-08-28

    We have written a {\\it Mathematica} program that calculates the integrand corresponding to any amplitude in the closed-time-path formulation of real time statistical field theory. The program is designed so that it can be used by someone with no previous experience with {\\it Mathematica}. It performs the contractions over the tensor indices that appear in real time statistical field theory and gives the result in the 1-2, Keldysh or RA basis. We have used the program to calculate the ward identity for the QED 3-point function, the QED 4-point function for two photons and two fermions, and the QED 5-point function for three photons and two fermions. In real time statistical field theory, there are seven 3-point functions, 15 4-point functions and 31 5-point functions. We produce a table that gives the results for all of these functions. In addition, we give a simple general expression for the KMS conditions between $n$-point green functions and vertex functions, in both the Keldysh and RA bases

  13. [Real time 3D echocardiography

    NASA Technical Reports Server (NTRS)

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

    2001-01-01

    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.

  14. Landsat real-time processing

    Microsoft Academic Search

    1986-01-01

    A novel method for performing real-time acquisition and processing Landsat\\/EROS data covers all aspects including radiometric and geometric corrections of multispectral scanner or return-beam vidicon inputs, image enhancement, statistical analysis, feature extraction, and classification. Radiometric transformations include bias\\/gain adjustment, noise suppression, calibration, scan angle compensation, and illumination compensation, including topography and atmospheric effects. Correction or compensation for geometric distortion includes

  15. 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.

  16. Real-time Quantum Chemistry

    E-print Network

    Moritz P. Haag; Markus Reiher

    2012-08-18

    Significant progress in the development of efficient and fast algorithms for quantum chemical calculations has been made in the past two decades. The main focus has always been the desire to be able to treat ever larger molecules or molecular assemblies---especially linear and sub-linear scaling techniques are devoted to the accomplishment of this goal. However, as many chemical reactions are rather local, they usually involve only a limited number of atoms so that models of about two hundred (or even less) atoms embedded in a suitable environment are sufficient to study their mechanisms. Thus, the system size does not need to be enlarged, but remains constant for reactions of this type that can be described by less than two hundred atoms. The question then arises how fast one can obtain the quantum chemical results. This question is not directly answered by linear-scaling techniques. In fact, ideas such as haptic quantum chemistry or interactive quantum chemistry require an immediate provision of quantum chemical information which demands the calculation of data in "real time". In this perspective, we aim at a definition of real-time quantum chemistry, explore its realm and eventually discuss applications in the field of haptic quantum chemistry. For the latter we elaborate whether a direct approach is possible by virtue of real-time quantum chemistry.

  17. Abstraction Planning in Real Time

    NASA Technical Reports Server (NTRS)

    Washington, Richard

    1994-01-01

    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.

  18. Proseminar Real Time Systems Introductory Meeting

    E-print Network

    Ábrahám, Erika

    Proseminar Real Time Systems Introductory Meeting Erika Ábrahám, Xin Chen, Florian Corzilius, Nils Systems - Proseminar Real Time Systems 1 / 6 #12;Content Contents (rough) Formal modeling of real world-Beamer Theory of Hybrid Systems - Proseminar Real Time Systems 3 / 6 #12;TODO Fix dates for Introduction

  19. Real-time refinery optimization

    SciTech Connect

    Kennedy, J.P.

    1989-04-01

    The purpose of this article is to describe real-time refinery optimization, how data are used and what types of data storage and manipulation are required to support an automated operation. Free communication is required, although there are less data transferred than one might suspect. Many doubt the ability of a computer to accurately predict the future, but no one doubts its ability to give accurate documentation of current position and the effect of historical decisions. The economic benefit of accurate computer-assisted planning is dramatic. The company that moves rapidly based on an accurate, short-term prediction of the market will be the one that makes the highest return on its investment. Long-range planning is proper, but no one could have predicted the oil embargo or the travel plans of the motoring public in the wake of terrorist activity. The chief function of a planning system is not to predict the future, but to prepare a standard against which the real world can be assessed and a basis for needed changes to match the real world. This is the only reasonable way in which to extract useful information out of the vast paper landfill of refinery records.

  20. The Real Time Ocean Environment

    NSDL National Science Digital Library

    Kirk Whitmer

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

  1. Real time infrared aerosol analyzer

    DOEpatents

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

    1990-01-01

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

  2. Evaluation of Real-Time Synchronization in Real-Time Mach

    Microsoft Academic Search

    Hideyuki Tokuda; Tatsuo Nakajima

    1991-01-01

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

  3. Multimodeling methodology for real-time simulation

    Microsoft Academic Search

    Kangsun Lee; Paul A. Fishwick

    1999-01-01

    Real-time systems differ from traditional data processing systems in that they are constrained by certain nonfunctional requirements (e.g., dependability and timing). Although real-time systems can be modeled using the standard structured design methods, these methods lack explicit support for expressing the real-time constraints. Our objective is to present a modeling methodology in which the real-time systems can be modeled efficiently

  4. Real-time analysis keratometer

    NASA Technical Reports Server (NTRS)

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

    1987-01-01

    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.

  5. Real-time flood forecasting

    USGS Publications Warehouse

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

    2009-01-01

    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.

  6. Resource allocation for real-time and non-real-time traffic in wireless networks

    Microsoft Academic Search

    Show-shiow Tzeng

    2006-01-01

    Next generation wireless networks are expected to support heterogeneous traffic, which can be classified into real-time and non-real-time traffic. Movable-boundary schemes [1–5], which are resource allocation schemes, for real-time and non-real-time traffic have been studied to increase the utilization of channels. In the schemes, non-real-time channels cannot be lent to real-time users. Adaptive applications, in which the channels allocated to

  7. Real-time Support in COM

    Microsoft Academic Search

    Deji Chen; Aloysius K. Mok; Mark Nixon

    1999-01-01

    While there has been substantial work on real-time CORBA — to offer real-time support in a distributed hetero- geneous environment with standard real-time middle-ware, comparatively less work has been done to investigate sup- port for real-time applications in COM, the direct competi- tor of CORBA. In this paper, we examine the COM technol- ogy and explore the possibility of providing

  8. ARTS: a distributed real-time kernel

    Microsoft Academic Search

    Hideyuki Tokuda; Clifford W. Mercer

    1989-01-01

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

  9. Real-time embedded controllers Luigi Palopoli

    E-print Network

    Schenato, Luca

    Real-time embedded controllers Luigi Palopoli Real-time embedded controllers ­ p. 1/2 #12;Dealing with delays Real-time embedded controllers ­ p. 2/2 #12;DT models of sampled-data systems · Using Z embedded controllers ­ p. 3/2 #12;Example · Example: G(s) = e-s a s+a with a > 0 Real-time embedded

  10. The Real-Time Specification for Java

    Microsoft Academic Search

    G. Bollella Andk. Jeffay; James Gosling

    2000-01-01

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

  11. Real-Time Systems Processor Architecture

    E-print Network

    Johansson, Roger

    On Real-Time Systems and Processor Architecture Roger Johansson Department of Computer Engineering Abstract This report discusses the impact of hard real-time systems requirements on mi- croprocessor discuss hard real-time systems and micropro- cessors from an architectural point of view as well as system

  12. Real-Time Adaptive A* Sven Koenig

    E-print Network

    Sukthankar, Gita Reese

    to move smoothly and thus need to search in real time. In this paper, we describe a simple but powerful between A* searches. We then use this technique to develop a novel real-time heuristic search method, called Real-Time Adaptive A*, which is able to choose its local search spaces in a fine-grained way

  13. Real-time interferometric synthetic aperture microscopy

    E-print Network

    Bhargava, Rohit

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

  14. Integration of Hard Real-Time and

    E-print Network

    Ungerer, Theo

    Integration of Hard Real-Time and Organic Computing Florian Kluge,1 , Jörg Mische,1 , Stefan running a real-time application with organic computing features. This capability is exploited: Autonomic computing; organic computing; multithreading; real-time scheduling; mi- crokernel 1 Introduction

  15. Designing Distributed, Real-Time Systems

    E-print Network

    Mills, Kevin

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

  16. Proseminar Real Time Systems Introductory Meeting

    E-print Network

    Ábrahám, Erika

    Proseminar Real Time Systems Introductory Meeting Erika Ábrahám, Xin Chen, Nils Jansen and Ulrich Loup Theory of Hybrid Systems Informatik 2 SS 10 Theory of Hybrid Systems - Proseminar Real Time research LATEX skills Theory of Hybrid Systems - Proseminar Real Time Systems 2 / 5 #12;Paper and Talk

  17. Replicating Real-Time Garbage Collector

    E-print Network

    Kent, University of

    of this work was presented at the 7th International Workshop on Java Technologies for Real-time and Embedded and RTGC [23], which targets real-time embedded systems, in particular the RTEMS and LEON architecture usedReplicating Real-Time Garbage Collector Tomas Kalibera Purdue University, West Lafayette, IN 47907

  18. Convex Optimization: from Real-Time Embedded

    E-print Network

    Hall, Julian

    Convex Optimization: from Real-Time Embedded to Large-Scale Distributed Stephen Boyd Neal Parikh of Edinburgh, June 25 2014 1 #12;Outline Convex Optimization Real-Time Embedded Optimization Large-Scale Distributed Optimization Summary 2 #12;Outline Convex Optimization Real-Time Embedded Optimization Large

  19. Arnold Schwarzenegger REAL-TIME GRID RELIABILITY

    E-print Network

    developed the California Independent System Operator (California ISO) Real- Time Dynamics Monitoring System Technology Solutions CA ISO Real-Time Dynamics Monitoring SystemTM (RTDMS) #12;#12;i Preface Electric Power's PDC and visualization monitor is depicted in Figure 1. The Real Time Dynamics Monitoring System

  20. Autonomous Real Time Requirements Tracing

    NASA Technical Reports Server (NTRS)

    Plattsmier, George; Stetson, Howard

    2014-01-01

    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.

  1. Autonomous Real Time Requirements Tracing

    NASA Technical Reports Server (NTRS)

    Plattsmier, George I.; Stetson, Howard K.

    2014-01-01

    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

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

    ERIC Educational Resources Information Center

    Pocovi, M. Cecilia; Finley, Fred

    2002-01-01

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

  3. Economics - local and real time

    SciTech Connect

    Latour, P.R. [Dynamic Matrix Control Corp., Houston, TX (United States)

    1996-01-01

    Operating economics for processing hydrocarbons to manufacture fuels and petrochemicals are complex, highly interactive, volatile, nonlinear, uncertain and hence controversial. There are sell prices, production values and buy costs. Each may be average or marginal for a particular stream. Each may be contracted, spot, future, offered or forecasted. There are production amount centers such as head count, capital deployed, thoroughput or {open_quotes}activity based.{close_quotes} These methods are used rather than allocating overhead proportional to value added/profit generated because determining the profit independently of overhead allocation has been computationally inwieldy. Closed-loop real-time optimization incorporates business objective functions, rigorous process models, flexible open-equation software formats, large scale non-linear successive quadratic programming optimization techniques and reconciled data fitted with plant parameters.

  4. Automata For Modeling Real-Time Systems

    Microsoft Academic Search

    Rajeev Alur

    1990-01-01

    To model the behavior of finite-state asynchronous real-time systems we propose the notion of timed Büchi automata (TBA). TBAs are Büchi automata coupled with a mechanism to express constant bounds on the timing delays between system events. These automata accept languages of timed traces, traces in which each event has an associated real-valued time of occurrence.

  5. VERSE - Virtual Equivalent Real-time Simulation

    NASA Technical Reports Server (NTRS)

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

    2005-01-01

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

  6. Real-Time Computerized Annotation of Pictures Real-Time Computerized Annotation of Pictures

    E-print Network

    Li, Jia

    Real-Time Computerized Annotation of Pictures Real-Time Computerized Annotation of Pictures Jia Li. Wang alipr.com #12;Real-Time Computerized Annotation of Pictures How Visible Are Web Images? Keukenhof photos Jia Li, James Z. Wang alipr.com #12;Real-Time Computerized Annotation of Pictures ALIPR: Automatic

  7. Specification and Analysis of Real-Time Systems Using Real-Time Maude

    E-print Network

    Ã?lveczky, Peter Csaba

    to advance "as much as possible" before something "interesting" happens. Real- Time Maude's search and modelSpecification and Analysis of Real-Time Systems Using Real-Time Maude Peter Csaba ¨Olveczky1 Department of Informatics, University of Oslo peterol@ifi.uio.no meseguer@cs.uiuc.edu Abstract. Real-Time

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

    E-print Network

    Jansen, James

    Real Time Search User Behavior Abstract Real time search is an increasingly important area% of the traffic comes from the engine's application program interface, indicating that real time search is heavily Web search. Searchers of real time content often repeat queries overtime, perhaps indicating long term

  9. Searching Solitaire in Real Time 131 SEARCHING SOLITAIRE IN REAL TIME

    E-print Network

    Searching Solitaire in Real Time 131 SEARCHING SOLITAIRE IN REAL TIME Ronald Bjarnason Prasad Tadepalli Alan Fern1 Corvallis, USA ABSTRACT This article presents a new real-time heuristic search method from an initial state to a goal state. In real-time search, one needs to commit to an action

  10. Enhancing Real-time CORBA via Real-time Java features

    E-print Network

    Schmidt, Douglas C.

    Enhancing Real-time CORBA via Real-time Java features Arvind S. Krishna, Douglas C. Schmidt predictability is essential to support quality of service (QoS) capabilities needed by dis- tributed real-time and embedded (DRE) applications. Real-time CORBA is a middleware standard that allows DRE applications

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

    Microsoft Academic Search

    Tatsuo Nakajima; Hideyuki Tokuda

    1996-01-01

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

  12. Evaluating Real-Time Java Features and Performance for Real-time Embedded Systems

    E-print Network

    Schmidt, Douglas C.

    Evaluating Real-Time Java Features and Performance for Real-time Embedded Systems Angelo Corsaro of programming languages and middleware for real-time and embedded applications. First, we present the empirical be applied to a variety of real-time embedded applications. 1 Introduction Until recently

  13. Real-time scene generator

    NASA Astrophysics Data System (ADS)

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

    1996-05-01

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

  14. Deconvolving Current from Faraday Rotation Measurement

    SciTech Connect

    Stephen E. Mitchell

    2008-02-01

    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.

  15. Deferring Real-Time Traffic for Improved Non-Real-Time Communication in FDDI Networks

    Microsoft Academic Search

    Moncef Hamdaoui; Parameswaran Ramanathan

    1995-01-01

    The fiber distributed data interface (FDDI) is suitable for real-time communication because of the high speed and the performance guarantees it provides. However, these guarantees are achieved at the expense of non-real-time traffic because the real-time messages are given higher priority over non-real-time messages,resulting in excessive delays for non-real-time messages. In this paper, we propose a scheme for reducing the

  16. A real-time Java server for Real-Time Mach

    Microsoft Academic Search

    A. Miyoshi; H. Tokuda

    1997-01-01

    The authors have developed a real-time Java server on the Real-Time Mach microkernel which is suitable for embedded systems and distributed real-time systems. By implementing it as a user-level server on Real-Time Mach, applications such as WWW browsers and embedded applications can both execute Java byte codes. They describe the real-time issues in Java and the architecture of the Java

  17. A real-time profile for UML

    Microsoft Academic Search

    Susanne Graf; Ileana Ober; Iulian Ober

    2006-01-01

    This paper describes an approach for real-time modelling in UML, focusing on analysis and verification of time and schedul- ing related properties. To this aim a concrete UML profile, called the OMEGA-RT profile, is defined, dedicated to real-time modelling by identifying a set of relevant concepts for real-time modelling which can be considered as a refinement of the standard SPT

  18. Adapting RealTime Physics

    NASA Astrophysics Data System (ADS)

    George, E. A.; Fleisch, D. A.; Voytas, P. A.; Dollhopf, W. E.

    2001-10-01

    We are changing the way we teach our introductory physics sequence, restructuring the laboratory portion of these courses around research-based curricular materials that make use of MBL and digital video capture techniques. As the first step in this project, we adapted RealTime Physics (RTP) Mechanics and Electric Circuits labs for an introductory Mechanics and an introductory E&M course. The RTP Mechanics labs had to be rather severely modified in order to fit the constraints of the Mechanics course (1.5 hours of lab a week). In both courses, we have also created several new experiments that make use of MBL and video tools and use an approach similar to that of the RTP experiments. We will briefly describe these new experiments, and discuss how well the modified RTP and new experiments have worked in the context of our curriculum. In addition, we will report pre- and post-instruction results on standard conceptual exams. We also retested about half the students in the E&M course nine months after they had completed the course in order to see how well they retained the concepts.

  19. Students Collecting Real time Data

    NASA Astrophysics Data System (ADS)

    Miller, P.

    2006-05-01

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

  20. FPGA-Based Real-Time EMTP

    Microsoft Academic Search

    Yuan Chen; Venkata Dinavahi

    2009-01-01

    Real-time transient simulation of large transmission networks requires significant computational power. This paper proposes a field-programmable gate array (FPGA)-based real-time electromagnetic transient simulator. Taking advantage of the inherent parallel architecture, high density, and high clock speed, the real-time Electromagnetic Transients Program (EMTP) is implemented on a single FPGA chip. It is based on a paralleled algorithm that is deeply pipelined,

  1. Weakly Hard Real-Time Systems

    Microsoft Academic Search

    Guillem Bernat; Alan Burns; Albert Llamosí

    2001-01-01

    In a hard real-time system it is assumed that no deadline is missed, whereas in a softor rm real-time system deadlines can be missed, although, this usually happens in a nonpredictableway. However, most hard real-time systems could miss some deadlines providedthat it happens in a known and predictable way. Also adding predictability on the patternof missed deadlines for soft and

  2. Communicating Real-Time State Machines

    Microsoft Academic Search

    Alan C. Shaw

    1992-01-01

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

  3. The Real-Time Channel Administration Protocol

    Microsoft Academic Search

    Anindo Banerjea; Bruce A. Mah

    1991-01-01

    The Real-time Channel Administration Protocol (RCAP) provides con- trol and administration services for the Tenet real-time protocol suite, a connection-oriented suite of network and transport layer protocols for real- time communication. RCAP performs per-channel reservation of network resources based on worst-case analysis to provide hard guarantees on delay, jitter, and packet loss bounds. It uses a hierarchical approach to provide

  4. Learning for Adaptive Real-time Search

    Microsoft Academic Search

    Vadim Bulitko

    2004-01-01

    Real-time heuristic search is a popular model of acting and learning in intelligent autonomous agents. Learning real-time search agents improve their performance over time by acquiring and refining a value funct ion guiding the application of their actions. As computing the perfect value function is typically intractable, a heuristic approximation is acquired instea d. Most studies of learn- ing in

  5. Computer Support for Real Time Collaborative Work

    Microsoft Academic Search

    Saul Greenberg; Ernest Chang

    1989-01-01

    A large portion of an office worker's time involves real time collaboration with fellow associates. Many traditional tools assist this process, such as telephones, meeting rooms, specialized media such as whiteboards, and so on. This paper is concerned with the potential of the computer as a tool to further enhance the group work process through direct support of real time

  6. Hard Real-Time Networking on Firewire

    Microsoft Academic Search

    Yuchen Zhang; Bojan Orlic; Peter Visser; Jan Broenink; P Marquet; N McGuire; P Wurmsdobler

    2005-01-01

    This paper investigates the possibility of using standard, low-cost, widely used FireWire as a new generation fieldbus medium for real-time distributed control applications. A real-time software subsystem, RT-FireWire was designed that can, in combination with Linux-based real-time operating system, provide hard real-time communication over FireWire. In addition, a high-level module that can emulate Ethernet over RT-FireWire was implemented. This additional

  7. Timed multitasking for real-time embedded software

    Microsoft Academic Search

    Jie Liu; E.A. Lee

    2003-01-01

    An event-triggered programming model, timed multitasking, is introduced that also takes a time-centric approach to real-time programming but controls timing properties through deadlines and events rather than time triggers.

  8. TART: Timed-Automata to Real-Time Java Tool

    Microsoft Academic Search

    Niusha Hakimipour; Paul Strooper; Andy Wellings

    2010-01-01

    In previous work, we have proposed a model based approach to developing real-time Java programs from timed automata. This approach allows us to verify the timed automata model mechanically by using current real-time model checking tools. Programs are then derived from the model by following a systematic approach. TART (timed automata to RTSJ Tool) is a prototype tool to support

  9. Real time dangerous driving status detection

    Microsoft Academic Search

    Yong-Ren Huang

    2011-01-01

    This paper presents a method which detects the situation of car dangerous driving by video information. We estimate the parameters of global motion from the real-time video of vehicle driving, and analyze the variation of parameters for detection the dangerous status of driving. Firstly, we utilize global motion estimation to obtain the parameters of perspective model from the real-time driving

  10. Learning in real-time search

    Microsoft Academic Search

    Sverrir Sigmundarson

    2004-01-01

    Learning Real-Time A* (LRTA*) is a learning real-time search method most commonly used in single player searches. It can make fast decisions and when doing repeated searches it converges to an optimal path. This paper will summarize the most commonly known variations of LRTA* and their main characteristics detailed. These variations will be implemented and compared using empirical results. This

  11. Real-Time Photorealistic Virtual Human Anatomy

    Microsoft Academic Search

    Yanling Liu; Jim X. Chen; Lin Yang

    2008-01-01

    The authors' voxel-based surface-reconstruction algorithm provides fast surface reconstruction and real-time modification to volume data. Focusing on high-quality human parts rendering as well as real-time interaction, the system provides a better platform for virtually learning human anatomy.

  12. Earlybird: Real-Time Search at Twitter

    Microsoft Academic Search

    Michael Busch; Krishna Gade; Brian Larson; Patrick Lok; Samuel Luckenbill; Jimmy Lin

    2012-01-01

    The web today is increasingly characterized by social and real-time signals, which we believe represent two frontiers in information retrieval. In this paper, we present Early bird, the core retrieval engine that powers Twitter's real-time search service. Although Early bird builds and maintains inverted indexes like nearly all modern retrieval engines, its index structures differ from those built to support

  13. Real-Time Moving Target Evaluation Search

    Microsoft Academic Search

    Cagatay Undeger; Faruk Polat

    2009-01-01

    In this correspondence, we address the problem of real-time moving target search in dynamic and partially observable environments, and propose an algorithm called real-time moving target evaluation search (MTES). MTES is able to detect the closed directions around the agent and determinestheestimatedbestdirectiontocaptureamovingtargetavoiding the obstacles nearby. We have also developed a new prey algorithm (Prey- A*) to test the existing and

  14. RETINA: REal-TIme Network Analyzer

    Microsoft Academic Search

    Haifeng Zhu; Jeffery P. Hansen; John P. Lehoczky; Ragunathan Rajkumar

    2005-01-01

    In this paper, we present an analytical tool called RETINA for analyzing real-time constraints in complex networks with stochastic traffic. RETINA is based on a statistical method called Real-Time Queueing Theory and can predict the fraction of late tasks in networks of queues given traffic conditions and queue protocol specifications. Upon submitting a profile of the network structure and data

  15. Real time obstacle avoidance for redundant robot

    Microsoft Academic Search

    Guoxiang Ping; Bing Wei; Xianglong Li; Xiang Luo

    2009-01-01

    Real-time obstacle avoidance for redundant robot is always of consequence in the field of robot research. According to the mechanism of the human arm movement in obstacle avoidance, an artificial safety zone around the obstacle in the operational space is defined. Based on the artificial safety zone, a unique technique of real-time collision avoidance for position controlled robot is proposed

  16. Real-Time Computerized Annotation of Pictures

    E-print Network

    Tian, Qi

    Real-Time Computerized Annotation of Pictures Presentation by: Yijuan Lu Data and Vision Seminar: real-time automatic annotation of pictures System Architecture Methodology: D2-clustering and Mixture image collections. Label: Images are often stored with the name that is produced by the digital camera

  17. Multimodeling methodology for real-time simulation

    NASA Astrophysics Data System (ADS)

    Lee, Kangsun; Fishwick, Paul A.

    1999-06-01

    Real-time systems differ from traditional data processing systems in that they are constrained by certain nonfunctional requirements (e.g., dependability and timing). Although real-time systems can be modeled using the standard structured design methods, these methods lack explicit support for expressing the real-time constraints. Our objective is to present a modeling methodology in which the real-time systems can be modeled efficiently to meet the given simulation objective and the model's time requirements. We developed a modeling methodology that functional requirements of real-time systems are captured with multiple levels of abstraction. Our approach to guaranteeing timing constraints is to vary the level of abstraction so that the simulation can deliver the desired results within the given amount of time. Two selection approaches have been developed to determine the optimal abstraction level that achieves the best tradeoff model quality for time: (1) IP (Integer Programming)-based approach and (2) Search-based approach. A more detailed model (low abstraction level) is selected when we have ample time, while a less detailed model (high abstraction level) is used when there is an imminent time constraint. One of the contributions of our research is that with the ability to select an optimal model for a given deadline, we provide a way to handle real-time constraints for the simulation group. Also, the determined level of abstraction provides the perspective which allows modelers to configure less important components of the system for a given time- constraint situation.

  18. Real-Time Heuristic Search: Research Issues

    Microsoft Academic Search

    Sven Koenig

    Real-time (heuristic) search methods allow for fine-grained control over how much planning to do between plan exe- cutions. Many real-time search methods can use heuristic knowledge to guide planning, be interrupted at any state and resume execution at a different state, and improve their plan- execution time as they solve similar planning tasks, until their plan-execution time is optimal. Unfortunately,

  19. Optimal Composition of Real-Time Systems

    Microsoft Academic Search

    Shlomo Zilberstein; Stuart J. Russell

    1996-01-01

    Real-time systems are designed for environments in which the utility of actions is strongly time-dependent. Recent work by Dean, Horvitz and others has shown that anytime algorithms are a useful tool for real-time system design, since they allow com- putation time to be traded for decision quality. In order to construct complex systems, however, we need to be able to

  20. 12 54 2 LabVIEW Real-Time

    E-print Network

    Katsumoto, Shingo

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

  1. Real time scheduling theory and its use with Ada

    E-print Network

    Paris-Sud XI, Université de

    Real time scheduling theory and its use with Ada Frank Singhoff University of Brest, France LISYC. Introduction Real time systems. What is real time scheduling. What we aim to do in this tutorial ? 2. Real time scheduling theory Introducing real time scheduling theory. Usual real time schedulers. Few words about shared

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

    Microsoft Academic Search

    Ho-joon Park; Chang-hoon Lee

    2004-01-01

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

  3. Making real-time reactive systems reliable

    NASA Technical Reports Server (NTRS)

    Marzullo, Keith; Wood, Mark

    1990-01-01

    A reactive system is characterized by a control program that interacts with an environment (or controlled program). The control program monitors the environment and reacts to significant events by sending commands to the environment. This structure is quite general. Not only are most embedded real time systems reactive systems, but so are monitoring and debugging systems and distributed application management systems. Since reactive systems are usually long running and may control physical equipment, fault tolerance is vital. The research tries to understand the principal issues of fault tolerance in real time reactive systems and to build tools that allow a programmer to design reliable, real time reactive systems. In order to make real time reactive systems reliable, several issues must be addressed: (1) How can a control program be built to tolerate failures of sensors and actuators. To achieve this, a methodology was developed for transforming a control program that references physical value into one that tolerates sensors that can fail and can return inaccurate values; (2) How can the real time reactive system be built to tolerate failures of the control program. Towards this goal, whether the techniques presented can be extended to real time reactive systems is investigated; and (3) How can the environment be specified in a way that is useful for writing a control program. Towards this goal, whether a system with real time constraints can be expressed as an equivalent system without such constraints is also investigated.

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

    E-print Network

    Qin, Xiao

    Study of Real-time Scheduling Model and Real-time Scheduling Algorithms with Fault-Tolerance Xiao New generation real-time systems must support real-time applications by maintaining an environment that satisfies real-time, predictability and reliability requirements. In the research of new generation real-time

  5. The Catalina Real-time Transient Survey

    E-print Network

    Drake, A J; Mahabal, A; Prieto, J L; Beshore, E; Graham, M J; Catalan, M; Larson, S; Christensen, E; Donalek, C; Williams, R

    2011-01-01

    The Catalina Real-time Transient Survey (CRTS) currently covers 33,000 deg^2 of the sky in search of transient astrophysical events, with time baselines ranging from 10 minutes to ~7 years. Data provided by the Catalina Sky Survey provides an unequaled baseline against which >4,000 unique optical transient events have been discovered and openly published in real-time. Here we highlight some of the discoveries of CRTS.

  6. Neural scheduler for real-time networks

    Microsoft Academic Search

    Tadashi Ae; Masafd Yamashita; Ken-ich Nitta

    1989-01-01

    Scheduling problem for real-time systems is known to be intractable, i.e. NP-hard or completely NP for most cases. A neural computation technique is introduced to solve it within a limited time under a hard real-time environment. Although the neural computation can be effectively carried out by a multiprocessor, a special processor is designed to obtain the scheduled result with no

  7. CCS + Time = An Interleaving Model for Real Time Systems

    Microsoft Academic Search

    Wang Yi

    1991-01-01

    This paper shows how to put time into Milner's CCS to model real time systems. In particular, we will develop an expansion theorem for real time concurrency, which is an extension of the expansion theorem of CCS. The essential step made in this work is that a more general form of action prefix, @t.P is introduced, where t is a

  8. Real time sensor for therapeutic radiation delivery

    DOEpatents

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

    1998-01-06

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

  9. Real time sensor for therapeutic radiation delivery

    DOEpatents

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

    1998-01-01

    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.

  10. Real-time monitoring of landslides

    USGS Publications Warehouse

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

    2012-01-01

    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.

  11. Real-Time Monitoring of Active Landslides

    USGS Publications Warehouse

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

    1999-01-01

    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.

  12. Real-time swept source optical coherence

    E-print Network

    Chen, Zhongping

    a microelectromechanical system endoscope and digital signal processor Jianping Su,a Jun Zhang,b Lingfeng Yu,b Henri G Colt clinical applications prefer onsite diagnosis, which requires a real-time technique. Parallel digital sig enables onsite diagnosis and is preferable for endoscopic clinical examina- tions. Furthermore, a real

  13. CORE: A real-time network emulator

    Microsoft Academic Search

    Jeff Ahrenholz; Claudiu Danilov; Thomas R. Henderson; Jae H. Kim

    2008-01-01

    We present CORE (common open research emulator), a real-time network emulator that allows rapid instantiation of hybrid topologies composed of both real hardware and virtual network nodes. CORE uses FreeBSD network stack virtualization to extend physical networks for planning, testing and development, without the need for expensive hardware deployments. We evaluate CORE in wired and wireless settings, and compare performance

  14. Arnold Schwarzenegger REAL-TIME GRID RELIABILITY

    E-print Network

    Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT Prototype Phasor-Based Real January 31, 2006 #12;Slide 1 Agenda Phasor Technology ­ Overview The Importance of Using Synchronized Data Displays Client Support RTDMS Application Demo #12;Slide 2 Phasor Technology Overview #12;Slide 3 Load

  15. Specification and Analysis of Real-Time Systems Using Real-Time Maude

    Microsoft Academic Search

    Peter Csaba Ölveczky; José Meseguer

    2004-01-01

    Abstract. Real-Time Maude is a language and,tool supporting the formal specication and analysis of real-time and hybrid systems. The specication formalism is based on rewriting logic, emphasizes generality and ease of specication, and is particularly suitable to specify objectoriented real-time systems. The tool oers a wide range of analysis techniques, including timed rewriting for simulation purposes, search, and time-bounded,linear temporal

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

    Microsoft Academic Search

    Hideyuki Tokuda; Makato Kotera; Clifford E. Mercer

    1990-01-01

    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

  17. Analysis of real-time vibration data

    USGS Publications Warehouse

    Safak, E.

    2005-01-01

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

  18. Real-time control over networks

    E-print Network

    Ji, Kun

    2007-09-17

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

  19. The Power of Real-time PCR

    NSDL National Science Digital Library

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

    2005-09-01

    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

  20. Real-time control over networks 

    E-print Network

    Ji, Kun

    2007-09-17

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

  1. Real Time Monitoring: Achieving Energy Efficiency 

    E-print Network

    Rouse, S.

    2009-01-01

    monitoring (RTM) is a tool that operators can use to detect and diagnose energy consumption in real time to identify problems and take immediate action! RTM allows the monitoring of energy consumption in 5 minute increments. Alarms notify...

  2. Active Faraday optical frequency standard.

    PubMed

    Zhuang, Wei; Chen, Jingbiao

    2014-11-01

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

  3. Real-time scheduling using minimum search

    NASA Technical Reports Server (NTRS)

    Tadepalli, Prasad; Joshi, Varad

    1992-01-01

    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.

  4. Thinking Ahead in Real-Time Search

    Microsoft Academic Search

    Dana S. Nau; Ugur Kuter; Emre Sefer

    2009-01-01

    We consider real-time planning problems in which some states are unsolvable, i.e., have no path to a goal. Such prob- lems are difficult for real-time planning algorithms such as RTA* in which all states must be solvable. We identify a property called k-safeness, in which the con- sequences of a bad choice become apparent within k moves after the choice

  5. Minimax real-time heuristic search

    Microsoft Academic Search

    Sven Koenig

    2001-01-01

    Abstract Real-time heuristic search methods,interleave planning and plan executions and plan only in the part of the domain,around the current state of the agents. This is the part of the domain,that is immediately,relevant for the agents in their current situation. So far, real-time heuristic search methods have mostly been applied to deterministic planning tasks. In this article, we argue that

  6. Processing PCM Data in Real Time

    NASA Technical Reports Server (NTRS)

    Wissink, T. L.

    1982-01-01

    Novel hardware configuration makes it possible for Space Shuttle launch processing system to monitor pulse-code-modulated data in real time. Using two microprogramable "option planes," incoming PCM data are monitored for changes at rate of one frame of data (80 16-bit words) every 10 milliseconds. Real-time PCM processor utilizes CPU in mini-computer and CPU's in two option planes.

  7. Intelligent Real-Time Network Management

    Microsoft Academic Search

    Anand S. Rao; Michael P. Georgeff

    1991-01-01

    This paper describes research concerned with automating the monitoring and controlof telecommunication networks. It describes an Interactive Real-Time TelecommunicationsNetwork Management System (IRTNMS) developed to diagnose and solve problemsoccurring in the telecommunications network in real time. IRTNMS builds on the ProceduralReasoning System (PRS) which, unlike traditional monitoring and control systems,is able to reason about and perform complex tasks in a very

  8. Real-Time Mutable Broadcast Disks

    Microsoft Academic Search

    Sanjoy K. Baruah; Azer Bestavros

    1997-01-01

    There is an increased interest in using broadcast disks to support mobile access to realtimedatabases. However, previous work has only considered the design of real-timeimmutable broadcast disks, the contents of which do not change over time. This paperconsiders the design of programs for real-time mutable broadcast disks --- broadcastdisks whose contents are occasionally updated. Recent scheduling-theoretic resultsrelating to pinwheel scheduling

  9. A Real Time Operating Systems (RTOS) Comparison

    Microsoft Academic Search

    Rafael V. Aroca; Glauco Caurin

    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

  10. Real-time operating system in Java

    Microsoft Academic Search

    Qinghua Lu

    2007-01-01

    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?

  11. The Concise Handbook of Real-Time Systems

    E-print Network

    Narasimhan, Priya

    The Concise Handbook of Real-Time Systems version 1.3 #12;The Concise Handbook Of Real-Time Systems are Real-Time Systems? . . . . . . . . . . . . . . . . . . . . . . . . . . .7 Real-Time System Application Real-Time System Architectures . . . . . . . . . . . . . . . .17 Deadlines and Timing Analysis

  12. Two-Frequency Paired Polarization Interferometer for Faraday Rotation Angle Detection

    NASA Astrophysics Data System (ADS)

    Lin, Chu-En; Chang, Jin-Gor; Chou, Li-Dek; Yu, Chih-Jen; Lee, Cheng-Chung; Chou, Chien

    2009-08-01

    A highly sensitive two-frequency paired linear polarized interferometer (TPPI) for measuring the Faraday rotation angle and Verdet constant of the Bi12SiO20 (BSO) crystal in real time was set up by an amplitude-sensitive detection method. TPPI features a common-path heterodyne interferometer in conjunction with a highly correlated paired linear polarized laser beam. Then, the antisymmetry of polarized heterodyne signals is produced and Faraday rotation angle detection by a balanced detector scheme is satisfied automatically. As a result, shot-noise-limited detection of Faraday rotation angle is possible. In addition, the Faraday rotation angle detection is also insensitive to the scattering and absorption caused by the specimen because of the common-path propagation of the paired linear polarized laser beam. Experimentally, the sensitivities of Faraday rotation angle and Verdet constant measurements of the BSO crystal under the arrangement with a single pass of the laser beam in TPPI are 4.93×10-5 rad/mm and 2.6×10-7 rad/(mT·mm), respectively. This suggests that the Faraday rotation angle detection sensitivity has the potential to be on the order of 10-8 rad/mm if a Fabry-Perot cavity with a finesse of F=120 is used in TPPI.

  13. REAL-TIME CROP SENSORS

    Technology Transfer Automated Retrieval System (TEKTRAN)

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

  14. FROM TIME-TRIGGERED TO TIME-DETERMINISTIC REAL-TIME SYSTEMS

    E-print Network

    FROM TIME-TRIGGERED TO TIME-DETERMINISTIC REAL-TIME SYSTEMS Peter Puschner and Raimund Kirner presents a very rigid software execution model for building dis- tributed hard real-time subsystems the operations of the hard real- time subsystem in synchrony with the real-time environment. The proposed

  15. Specication and Analysis of Real-Time Systems Using Real-Time Maude

    Microsoft Academic Search

    Peter Csaba

    Real-Time Maude is a language and tool supporting the formal specication and analysis of real-time and hybrid systems. The specication formalism is based on rewriting logic, emphasizes generality and ease of specication, and is particularly suitable to specify object- oriented real-time systems. The tool oers a wide range of analysis tech- niques, including timed rewriting for simulation purposes, search, and

  16. Using Real-Time Serializability and Optimistic Concurrency Control in Firm Real-Time Databases

    Microsoft Academic Search

    Jan Lindstr; Kimmo Raatikainen

    In a real-time database system, it is difficult to meet all timing constraints due to the consistency requirements of the underlying database. Real-time database transaction scheduling requires the development of efficient concurrency control protocols that try to maximize the number of trans- actions satisfying their real-time constraints. However, when the transactions in the system are heterogeneous, they are not of

  17. Specification of Real-Time Systems in Real-Time Temporal Interval Logic

    Microsoft Academic Search

    K. T. Narayana; A. A. Aaby

    1988-01-01

    A real-time variant of temporal interval logic is proposed for the specification and reasoning of real-time systems. In the framework of the logic, it is possible to specify qualitative and quantitative aspects of temporal behaviors of systems. The formalism provides capabilities for quantitative specification of time behavior. The harmonization of temporal interval logic with real-time features leads to a very-high-level

  18. A Secure Real-Time Concurrency Control Protocol for Mobile Distributed Real-Time Databases

    Microsoft Academic Search

    Yingyuan Xiao; Yunsheng Liu; Guoqiong Liao

    2007-01-01

    Summary A class of security-critical applications with the requirements of timing constraints, such as wireless stock trading, power network scheduling, real-time traffic information management, etc., demand the support of mobile distributed real-time database systems. For the class of applications, mobile distributed real-time database systems must simultaneously satisfy two requirements in guaranteeing data security and minimizing the missing deadlines ratio of

  19. New Trends in Real Time Operating Systems

    Microsoft Academic Search

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

    2012-01-01

    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

  20. Co-Scheduling Variable Execution Time Requirement Real-Time Tasks and Non Real-Time Tasks

    Microsoft Academic Search

    Abhishek Singh; Kevin Jeffay

    2007-01-01

    By scheduling the non real-time tasks earlier while still meeting deadlines for the real-time tasks, the overall syst em performance can be improved. In particular, we believe that the variability in the execution time requirements of real- time tasks can be effectively leveraged to reduce response times of non real-time tasks. We propose a novel proces- sor sharing algorithm where

  1. Elapsed Time in the Real World

    NSDL National Science Digital Library

    National Security Agency Central Security Service

    2009-04-24

    "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)

  2. Real-Time Symbolic Model Checking for Discrete Time Models

    Microsoft Academic Search

    Sergio V. Campos; Edmund M. Clarke

    1995-01-01

    The bdd-based symbolic model checking algorithm given in [4, 10] is extended to handlereal-time properties using the bounded until operator [9]. We believe that this algorithm,which is based on discrete time, is able to handle many real-time properties that arise inpractical problems. One example of such a property is priority inversion. This is a seriousproblem that can make real-time systems

  3. Real-Time Water Data

    NSDL National Science Digital Library

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

  4. REAL TIME SYSTEM OPERATIONS 2006-2007

    SciTech Connect

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

    2008-08-15

    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.

  5. Real-time, high frequency QRS electrocardiograph

    NASA Technical Reports Server (NTRS)

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

    2006-01-01

    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.

  6. Real-time Extensions for the Fiacre modeling language

    E-print Network

    Paris-Sud XI, Université de

    Real-time Extensions for the Fiacre modeling language Nouha Abid Silvano Dal Zilio CNRS ; LAAS ; 7 of the Fiacre language with real-time con- structs and real-time verification patterns. Fiacre is a formal on the extension of the Fiacre language with real-time constructs and real-time verification patterns. Our

  7. Hard Real-Time Programming is Different Peter Puschner

    E-print Network

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

  8. Real time process algebra with time-dependent conditions

    Microsoft Academic Search

    Jos C. M. Baeten; C. A. Middelburg

    2001-01-01

    We add conditionals with time-dependent conditions to the real time process algebra with para- metric timing from the framework of process algebras with timing presented by Baeten and Middel- burg (Handbook of Process Algebra, Elsevier, 2001, Chapter 10). This extension facilitates flexible dependence of process behaviour on initialization time. We show that the conditions concerned gen- eralize the conditions introduced

  9. An efficient time representation for real-time embedded systems

    Microsoft Academic Search

    Alessio Carlini; Giorgio C. Buttazzo

    2003-01-01

    Real-time systems should provide a time representation mechanism which allows to specify timing constraints in a wide range and with sufficiently high resolution. Moreover, the system lifetime (that is, the longest absolute time that can be handled by the system) should be as long as possible, or possibly infinite. In powerful architectures, this goal is achieved by representing time through

  10. Estimating probabilistic timing performance for real-time embedded systems

    Microsoft Academic Search

    Xiaobo Sharon Hu; Tao Zhou; Edwin Hsing-mean Sha

    2001-01-01

    In system-level design of real-time embedded systems, being able to capture the interactions among the tasks with respect to timing constraints and determine the overall system timing performance is a major challenge. Most previous works in the area are either based on a fixed execution time model or are only concerned with the probabilistic timing behavior of each individual task.

  11. Minimizing Busy Time in Multiple Machine Real-time Scheduling

    E-print Network

    Shachnai, Hadas

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

  12. Real-Time Edge Follow: A New Paradigm to Real-Time Path Search

    Microsoft Academic Search

    Cagatay Undeger; Faruk Polat; Ziya Ipekkan

    2001-01-01

    Path searching and mission planning are challenging problems in many domains such as war games, robotics, military mission planning, computer-generated forces, etc. The objective of this study is to develop a real-time path- planning algorithm to accomplish specified missions on large landscapes. For that purpose, a real-time goal- directed path search algorithm, Real-Time Edge Follow (RTEF), which can work on

  13. Real-time Planning by Interleaving Real-time Search with Subgoaling

    Microsoft Academic Search

    Shigeo Matsubara; Toru Ishida

    1994-01-01

    Recently, real-time planning has been actively studied for solving problems in uncertain and dy- namic environments. RTA* is a real-time search algorithm that can provide a computational ba- sis for real-time planning. However, RTA* is not always efficient since obtaining effective heuristic functions is difficult when the problem becomes complicated. In order to keep the problem sim- ple enough for

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

    Microsoft Academic Search

    Cagatay Undeger; Faruk Polat

    2007-01-01

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

  15. Comparing real-time and incremental heuristic search for real-time situated agents

    Microsoft Academic Search

    Sven Koenig; Xiaoxun Sun

    2009-01-01

    Real-time situated agents, such as characters in real-time computer games, often do not know the terrain in advance but automat- ically observe it within a certain range around themselves. They have to interleave searches with action executions to make the searches tractable when moving autonomously to user-specified coordinates. The searches face real-time requirements since it is important that the agents

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

    Microsoft Academic Search

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

    2004-01-01

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

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

    Microsoft Academic Search

    Hideyuki Tokuda; Tatsuo Nakajima; Prithvi Rao

    1990-01-01

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

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

    Microsoft Academic Search

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

    2011-01-01

    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

  19. Enhancing Real-Time CORBA via Real-Time Java Features

    Microsoft Academic Search

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

    2004-01-01

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

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

    Microsoft Academic Search

    Neha Sugandh; Santiago Ontañón; Ashwin Ram

    2008-01-01

    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

  1. A Real-Time Discrete Event System Specification Formalism for Seamless Real-Time Software Development

    Microsoft Academic Search

    Joon Sung Hong; Hae-Sang Song; Tag Gon Kim; Kyu Ho Park

    1997-01-01

    We present a time domain extension of the hierarchical and modular discrete event specification (DEVS) formalism. This extension is important for establishing a seamless real-time software development framework. Formalisms help describe a system unambiguously. If formal models are implemented without any consistent frameworks, however, it is hard to guarantee that there is no semantic gap between models and codes. Real-Time

  2. Real-time fast economic dispatch

    SciTech Connect

    Lin, C.E.; Hong, Y.Y.; Chuko, C.C.

    1987-11-01

    This paper presents a real-time economic dispatch method by calculating the penalty factors from a base case data-base. The base case data-base is established from some operating points of the seasonal average of daily demand curve. Real-time basis equation derivation is performed, and the solution procedure is described. An approximate solution can be obtained very quickly by the proposed method. An example system is tested to show the computation capability of the proposed method. The computation time of this method is much shorter, and the solution accuracy is good, compared to other adopted methods. This method is very suitable for real-time economic dispatch in power system operation.

  3. Real-time gauge/gravity duality

    E-print Network

    Kostas Skenderis; Balt C. van Rees

    2008-07-23

    We present a general prescription for the holographic computation of real-time n-point functions in non-trivial states. In QFT 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 i epsilon insertions.

  4. Feedback as Real-Time Constructions

    ERIC Educational Resources Information Center

    Keiding, Tina Bering; Qvortrup, Ane

    2014-01-01

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

  5. Real time earthquake forecasting in Italy

    Microsoft Academic Search

    M. Murru; R. Console; G. Falcone

    2009-01-01

    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.

  6. Preemptibility in Real-Time Operating Systems

    Microsoft Academic Search

    Clifford W. Mercer; Hideyuki Tokuda

    1992-01-01

    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

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

    E-print Network

    Qin, Xiao

    1 Study of Real-time Scheduling Model and Real-time Scheduling Algorithms with Fault #12;3 ABSTRACT In the first part of this thesis, models of architectures for distributed real-time in the distributed real-time applications. Before presenting real-time scheduling algorithm with fault

  8. Developing Improved Travel Time Reliability Measures For Real-time

    E-print Network

    Bertini, Robert L.

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

  9. Calculating the Maximum Execution Time of Real-Time Programs

    Microsoft Academic Search

    Peter P. Puschner; Christian Koza

    1989-01-01

    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.

  10. Real time network modulation for intractable epilepsy Behnaam Aazhang

    E-print Network

    Aazhang, Behnaam

    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

  11. 75 FR 68418 - Real-Time System Management Information Program

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-08

    ...assuring the quality of the information...real-time system management information...in meeting quality requirements...Real-Time System Management Information...ensuring the quality of the information...Real-Time System Management...

  12. A real time economic dispatch computer system

    SciTech Connect

    Del Valle, J.W.; Hagood, A.; Butler, T.F. [Tennesee Valley Authority, Chattanooga, TN (United States)

    1995-06-01

    This paper describes a software system that performs a real time least cost dispatch on a multi-unit power plant. It uses heat rate curves to compute cost, and performs dispatch by equating incremental heat rates (IHRs), the method being called levelized incremental heat rate dispatching, or LIHRD. It has the ability to read real time heat rate data and compute the heat rate functions almost instantaneously, and thus dispatch in real time. In addition, it can display graphs of the computed heat rate functions, can determine the most efficient plant load at which to operate, offers a visual verification of the correctness of the computed unit dispatch loads, and can compute the cost difference between an optimal and an actual dispatch.

  13. Real-Time Sensor Validation System Developed

    NASA Technical Reports Server (NTRS)

    Zakrajsek, June F.

    1998-01-01

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

  14. Real-Time Visualization of Tissue Ischemia

    NASA Technical Reports Server (NTRS)

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

    2000-01-01

    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.

  15. Network protocols for real-time applications

    NASA Technical Reports Server (NTRS)

    Johnson, Marjory J.

    1987-01-01

    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.

  16. Real Time Linux - The RTOS for Astronomy?

    NASA Astrophysics Data System (ADS)

    Daly, P. N.

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

  17. Real-time networking over HIPPI

    Microsoft Academic Search

    Riccardo Bettati; Anisoara Nica

    1995-01-01

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

  18. Mobile waste inspection real time radiography system

    SciTech Connect

    Vigil, J.; Taggart, D.; Betts, S.; Rael, C.; Martinez, F.; Mendez, J. [Los Alamos National Lab., NM (United States). Chemical Science and Waste Technology

    1995-10-01

    The 450-KeV Mobile Real Time Radiography System was designed and purchased to inspect containers of radioactive waste produced at Los Alamos National Laboratory (LANL). The Mobile Real Time Radiography System has the capability of inspecting waste containers of various sizes from 5-gal. buckets to standard waste boxes (SWB, dimensions 54.5 in. x 71 in. x 37 in.). The fact that this unit is mobile makes it an attractive alternative to the costly road closures associated with moving waste from the waste generator to storage or disposal facilities.

  19. Automated real-time software development

    NASA Technical Reports Server (NTRS)

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

    1993-01-01

    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.

  20. Real-time scene generation infrared radiometry

    NASA Astrophysics Data System (ADS)

    Williams, Owen M.; Christie, Chad L.; Shen, Guangfu; Gouthas, Efthimios; Swierkowski, Leszek

    2010-04-01

    With the development and widespread availability of computer graphics cards, complex infrared scenes can now be readily generated for application in real-time hardware-in-the-loop simulations. It is important that the best efforts are made to ensure that the scenes are radiometrically valid, to the level where the operation of the imaging infrared unitunder- test can be properly emulated. In this paper we describe the techniques we employ to ensure radiometric validity within our real-time aircraft and boat simulation applications of current interest.

  1. Machine vision for real time orbital operations

    NASA Technical Reports Server (NTRS)

    Vinz, Frank L.

    1988-01-01

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

  2. Axial tomography from digitized real time radiography

    SciTech Connect

    Zolnay, A.S.; McDonald, W.M.; Doupont, P.A.; McKinney, R.L.; Lee, M.M.

    1985-01-18

    Axial tomography from digitized real time radiographs provides a useful tool for industrial radiography and tomography. The components of this system are: x-ray source, image intensifier, video camera, video line extractor and digitizer, data storage and reconstruction computers. With this system it is possible to view a two dimensional x-ray image in real time at each angle of rotation and select the tomography plane of interest by choosing which video line to digitize. The digitization of a video line requires less than a second making data acquisition relatively short. Further improvements on this system are planned and initial results are reported.

  3. Real-time digital disk applications

    NASA Astrophysics Data System (ADS)

    Sapp, Clyde A.; Pitts, David E.; Premkumar, Saganti B.; Houston, A. G.

    1992-06-01

    Software and image processing techniques have been developed which make use of a real-time digital disk to capture video frames at video rates and which allow either the transfer of these data to standard speed disk drives or to conduct analysis directly from the real-time digital disk. This capability can be extremely useful in a number of applications which have their original data in a video format. An overview of this general capability, along with three specific application examples are presented here.

  4. IEEE Real-Time Embedded Systems Workshop, Dec. 3, 2001 1 Using Real Hardware to Create an Accurate Timing

    E-print Network

    IEEE Real-Time Embedded Systems Workshop, Dec. 3, 2001 1 Using Real Hardware to Create an Accurate for deployment in embedded real-time systems. The timing data that has been used to construct the timing model the timely operation of a real-time system, it is necessary to assess the Worst-Case Execution Time (WCET

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

    Microsoft Academic Search

    Jinfeng Huang; Jeroen Voeten; Marc Geilen

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

  6. Replay Debugging of Real-Time Systems Using Time Machines

    Microsoft Academic Search

    Henrik Thane; Daniel Sundmark; Joel Huselius; Anders Pettersson

    2003-01-01

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

  7. OPAD-EDIFIS Real-Time Processing

    NASA Technical Reports Server (NTRS)

    Katsinis, Constantine

    1997-01-01

    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.

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

    E-print Network

    Jain, Abhishek

    2014-08-05

    reliability to the real time clients, while Round Robin policy provides reliability to the clients but fails to achieve high system throughput in a time-varying wireless network. Apart from these policies, there are scheduling policies which prioritize clients...

  9. Development and first experimental tests of Faraday cup array.

    PubMed

    Prok?pek, J; Kaufman, J; Margarone, D; Kr?s, M; Velyhan, A; Krása, J; Burris-Mog, T; Busold, S; Deppert, O; Cowan, T E; Korn, G

    2014-01-01

    A new type of Faraday cup, capable of detecting high energy charged particles produced in a high intensity laser-matter interaction environment, has recently been developed and demonstrated as a real-time detector based on the time-of-flight technique. An array of these Faraday cups was designed and constructed to cover different observation angles with respect to the target normal direction. Thus, it allows reconstruction of the spatial distribution of ion current density in the subcritical plasma region and the ability to visualise its time evolution through time-of-flight measurements, which cannot be achieved with standard laser optical interferometry. This is a unique method for two-dimensional visualisation of ion currents from laser-generated plasmas. A technical description of the new type of Faraday cup is introduced along with an ad hoc data analysis procedure. Experimental results obtained during campaigns at the Petawatt High-Energy Laser for Heavy Ion Experiments (GSI, Darmstadt) and at the Prague Asterix Laser System (AS CR) are presented. Advantages and limitations of the used diagnostic system are discussed. PMID:24517754

  10. Development of real-time photoacoustic microscopy

    Microsoft Academic Search

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

    2011-01-01

    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

  11. REAL-TIME DATA SERVICES MANAGEMENT TRANSPORTATION

    E-print Network

    Fisher, Kathleen

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

  12. Real-Time Cold Chain Mapping

    Microsoft Academic Search

    Allen Higgins; Stefan Klein; Stefan Reidy; Fred Barrett; Nils Johanning

    This paper presents an investigation of the application of autonomous telemetry sensors for real-time cold-chain mapping and shipment management of temperature sensitive product. New developments in electronic cold chain management pose challenges to organisations and how they engage in inter- organisational interactions. Advanced sensors and wireless monitoring enable the capture of multiple parameters such as temperature and location. A configuration

  13. Real time and embedded (RTE) GENI

    Microsoft Academic Search

    Lui Sha; Ashok Agrawala

    2006-01-01

    This is a brief pre-view of the NSF Real Time and Embedded workshop report. Any opinion, finding, conclusion or recommendation expressed in this article are those of the authors and do not necessarily reflect the views of NSF and may differ from the final report on RTE GENI.

  14. Real time compression of triangle mesh connectivity

    Microsoft Academic Search

    Stefan Gumhold; Wolfgang Straßer

    1998-01-01

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

  15. Real-time PCR in virology

    Microsoft Academic Search

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

    2002-01-01

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

  16. Real-time gradient-domain painting

    Microsoft Academic Search

    James Mccann; Nancy S. Pollard

    2008-01-01

    We present an image editing program which allows artists to paint in the gradient domain with real-time feedback on megapixel- sized images. Along with a pedestrian, though powerful, gradient- painting brush and gradient-clone tool, we introduce an edge brush designed for edge selection and replay. These brushes, coupled with special blending modes, allow users to accomplish global lighting and contrast

  17. Real-time closed-world tracking

    Microsoft Academic Search

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

    1997-01-01

    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

  18. Real-time dynamics of proton decay

    E-print Network

    Dmitri Grigoriev

    2005-09-28

    Substituting Skyrmion for nucleon, one can potentially see -- in real time -- how the monopole is catalysing the proton (or neutron) decay, and even obtain a plausible estimate for catalysis cross-section. Here we discuss the key aspects of a practical implementation of such approach and demonstrate how one can overcome the main technical problems: Gauss constraint violation and reflections at the boundaries.

  19. The Power of Real-Time PCR

    ERIC Educational Resources Information Center

    Valasek, Mark A.; Repa, Joyce J.

    2005-01-01

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

  20. Arnold Schwarzenegger REAL-TIME GRID RELIABILITY

    E-print Network

    Arnold Schwarzenegger Governor REAL-TIME GRID RELIABILITY MANAGEMENT California ISO Phasor .........................................................................................................3 1.2. Overview of WECC-CA ISO Phasor Network ................................................................................................................21 LIST OF FIGURES Figure 1: Current and Future WECC-California ISO Phasor Data Communication Network

  1. Real-time optoacoustic monitoring during thermotherapy

    NASA Astrophysics Data System (ADS)

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

    2000-05-01

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

  2. Real-time optoacoustic monitoring during thermotherapy

    Microsoft Academic Search

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

    2000-01-01

    Optoacoustic monitoring of tissue optical properties and speed of sound in real time can provide fast and accurate feedback information during thermotherapy performed with various heating or cooling agents. Amplitude and temporal characteristics of optoacoustic pressure waves are dependent on tissue properties. Detection and measurement of the optoacoustic waves may be used to monitor the extent of tissue hyperthermia, coagulation,

  3. Real-time shaded NC milling display

    Microsoft Academic Search

    Tim Van Hook

    1986-01-01

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

  4. PETROBRAS Experience Implementing Real Time Optimization

    Microsoft Academic Search

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

    2009-01-01

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

  5. Real-Time Pencil Rendering Hyunjun Lee

    E-print Network

    Lee, Seungyong

    textures that reflect the properties of graphite pencils and paper. We show several rendering examples the characteristics of graphite pencils com- bined with paper effects [Sousa and Buchanan 1999; Sousa and BuchananReal-Time Pencil Rendering Hyunjun Lee POSTECH Sungtae Kwon POSTECH Seungyong Lee POSTECH Abstract

  6. Real-Time Ethernet - Industry Prospective

    Microsoft Academic Search

    MAX FELSER

    2005-01-01

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

  7. Real Time Ethernet: Standardization and implementations

    Microsoft Academic Search

    Max Felser

    2010-01-01

    The International Electrotechnical Commission (IEC) failed to define one standard Real Time Ethernet (RTE) solution. The actual set of standards defines more than a dozen of technical different solutions. This paper tries to give an overview and indication of differences between these specifications.

  8. Real-time earthquake data feasible

    Microsoft Academic Search

    Susan Bush

    1991-01-01

    Scientists agree that early warning devices and monitoring of both Hurricane Hugo and the Mt. Pinatubo volcanic eruption saved thousands of lives. What would it take to develop this sort of early warning and monitoring system for earthquake activity?Not all that much, claims a panel assigned to study the feasibility, costs, and technology needed to establish a real-time earthquake monitoring

  9. Klaus Honscheid Real Time 99 Data Acquisition

    E-print Network

    Backpressure / Dataflow Control (TCP/IP) · Free Data Link (Built in Fast Ethernet) · Solaris vs. vxWorks Honscheid Real Time 99 Readout ControllerReadout Controller VME Solution:PowerPC + VxWorks Let Motorola't underestimate the market (Network speed, CPU performance ...) Motorola Excellent! Wind River (vxWorks) well

  10. Distributed Real-Time Embedded Video Processing

    E-print Network

    Kepner, Jeremy

    is a video surveillance system that is able to identify body parts and objects and then recognizeDistributed Real-Time Embedded Video Processing Tiehan Lv (1), Burak Ozer (2), Wayne Wolf (1) (1 the activity of people or objects in the scene. #12;Sample Scenarios #12;Algorithms Video Input Image

  11. Real-time distributed multimedia systems

    SciTech Connect

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

    1996-12-31

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

  12. Calibration Curves for Real-Time PCR

    Microsoft Academic Search

    K. Kay-Yin Lai; Linda Cook; Elizabeth M. Krantz; Lawrence Corey; Keith R. Jerome

    2005-01-01

    Background: Despite the increasing use of real-time PCR in the diagnosis and management of viral infec- tions, there are no published studies adequately ad- dressing the optimum number of calibrators, the num- ber of replicates of each calibrator, and the frequency with which calibration needs to be repeated. This study was designed to address these issues. Methods: Cycle threshold data

  13. Real-time interaction with supervised learning

    Microsoft Academic Search

    Rebecca Fiebrink

    2010-01-01

    My work concerns the design of interfaces for effective interaction with machine learning algorithms in real-time application domains. I am interested in supporting human interaction throughout the entire supervised learning process, including the generation of training examples. In my dissertation research, I seek to better understand how new machine learning interfaces might improve accessibility and usefulness to non-technical users, to

  14. 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 ...

  15. Real-time telephone channel simulation

    Microsoft Academic Search

    Kamal Jabbour; J. Vega-Riveros

    1985-01-01

    The paper describes the real-time implementation of a telephone channel simulator on the TMS32010 digital signal processor. Several characteristics are simulated, including harmonic distortion, attenuation distortion, group delay distortion, listener echo, frequency offset, phase jitter, gaussian noise, impulsive noise, phase jumps and gain hits. A design program written in Pascal and running on a personal computer allows the user to

  16. Real-Time Operating Systems & Resource Management

    E-print Network

    Ouhyoung, Ming

    Overview A General Architecture of Real-Time/ Embedded Operating Systems (RTOS's) Scheduling Strategies reserved, Tei-Wei Kuo, National Taiwan University, 2002. A General Architecture of RTOS's Various, Tei-Wei Kuo, National Taiwan University, 2002. A General Architecture of RTOS's Objectives

  17. Real-time analysis of telemetry data

    NASA Technical Reports Server (NTRS)

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

    1987-01-01

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

  18. Real-time Scheduling on Multiprocessors

    Microsoft Academic Search

    Joël Goossens; Sanjoy Baruah; Shelby Funk

    2002-01-01

    We have recently been studying the scheduling of real-time systems uponuniform and identical multiprocessor platforms. In particular, we have beenexploring the use of EDF-scheduling in such systems; this paper summarizessome of our recent ndings in this eld.

  19. Architecture of a real time operating system

    Microsoft Academic Search

    J. L. Pruitt; W. W. Case

    1975-01-01

    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

  20. Real-Time Operating System/360

    NASA Technical Reports Server (NTRS)

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

    1969-01-01

    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.

  1. Supervisory Control of Real-Time Systems Using Prioritized Synchronization

    E-print Network

    Kumar, Ratnesh

    Supervisory Control of Real-Time Systems Using Prioritized Synchronization Ratnesh Kumar event systems is extended to the real-time setting. The real-time behavior of a system is represented: Discrete event systems, timed automata, real-time systems, prioritized synchronization, supervisory control

  2. Timing Analysis of Real-Time Communication Under Electromagnetic Interference

    Microsoft Academic Search

    Ian Broster; Alan Burns; Guillermo Rodríguez-navas

    2005-01-01

    This paper discusses aspects of dependability of real-time communication. In particular, we consider timing behaviour under fault conditions for Controller Area Network (CAN) and the extension Time-triggered CAN (TTCAN) based on a time-driven schedule. We discuss the differences between these buses and their behaviour under electromagnetic interference. We present response timing analyses for CAN and TTCAN in the presence of

  3. 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.

  4. Real-time quantitative PCR in parasitology

    Microsoft Academic Search

    Andrew S. Bell; Lisa C. Ranford-Cartwright

    2002-01-01

    Standard techniques for counting parasites are often time-consuming, difficult and inaccurate, and occasionally unpleasant. Real-time quantitative polymerase chain reaction has recently been applied to parasitology, specifically Plasmodium, Toxoplasma, Leishmania and Neospora. These techniques are truly quantitative, give results over a range of 6–7 orders of magnitude, are quick to perform and require no manipulations post-amplification. They can be used to

  5. Real Time Correction of Aircraft Flight Fonfiguration

    NASA Technical Reports Server (NTRS)

    Schipper, John F. (Inventor)

    2009-01-01

    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.

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

    Microsoft Academic Search

    Ligang He; Stephen A. Jarvis; Daniel P. Spooner; Hong Jiang; Donna N. Dillenberger; Graham R. Nudd

    2006-01-01

    This paper addresses workload allocation techniques 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) and the Optimized mean Miss Rate (OMR), are developed by establishing and numerically solving two optimization equation sets. The ORT strategy achieves an optimized

  7. Real Time RF Simulator (RTS) and control

    SciTech Connect

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

    2008-10-01

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

  8. Real time gamma-ray signature identifier

    SciTech Connect

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

    2012-05-15

    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.

  9. Broadband Faraday isolator

    NASA Astrophysics Data System (ADS)

    Berent, Micha?; Rangelov, Andon A.; Vitanov, Nikolay V.

    2013-01-01

    Driving on an analogy with the technique of composite pulses in quantum physics, we propose a broadband Faraday rotator and thus a broadband optical isolator, which is composed of sequences of ordinary Faraday rotators and achromatic quarter-wave plates rotated at the predetermined angles.

  10. Practical Real-Time Computing System for Biomedical Experiment Interface

    Microsoft Academic Search

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

    1999-01-01

    Many biomedical experiments require a precisely timed real-time (RT) computer interface. Because commonly used desktop operating systems are inherently non-real-time, real-time laboratory computer systems are often based on outdated DOS software or expensive proprietary real-time operating systems. Here we discuss a real-time computing system, based on the free RT-Linux operating system, which we have developed for adaptive pacing control in

  11. On Satisfying Timing Constraints in Hard-Real-Time Systems

    Microsoft Academic Search

    Jia Xu

    1993-01-01

    The authors explain why pre-run-time scheduling is essential if one wishes to guarantee that timing constraints will be satisfied in a large complex hard-real-time system. They examine some of the major concerns in pre-run-time scheduling and consider what formulations of mathematical scheduling problems can be used to address those concerns. This work provides a guide to the available algorithms.

  12. Real-Time Strategy Game AI and More Michael Buro

    E-print Network

    Buro, Michael

    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

  13. Real-time RTPCR for identification of differentially

    E-print Network

    Sundberg, Rolf

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

  14. Solving Large POMDPs using Real Time Dynamic Programming

    E-print Network

    Bonet, Blai

    function. rtdp-bel is a Real Time Dynamic Programming algorithm 1], namely, a greedy search algorithm Dynamic Programming (rtdp) procedure 1] and can be seen both as a learning real-time search al- gorithm 10 Learning Real Time Search (Section 2), Markov Decision Problems (Section 3), Real Time Dy- namic

  15. Algorithms for Dependable Hard Real-Time Systems (Extended Abstract)

    E-print Network

    Algorithms for Dependable Hard Real-Time Systems £ (Extended Abstract) Peter Puschner Institut f of traditional coding and yields code that is well-suited for hard real-time systems, i.e., its WCET is short that are imposed on non real-time respectively real-time code are usu- ally quite diverse. In a system that does

  16. Implementing Real-time Scheduling Within a Multithreaded Java Microcontroller

    E-print Network

    Ungerer, Theo

    and hardware implementation of real-time schedul- ing schemes, which are embedded in a multi- threaded Java, only GP allows isolation of threads. Keywords: real-time Java, real-time schedul- ing, embedded systems, in par- ticular, embedded real-time systems. In this area microcontrollers are typically preferred over

  17. Real-Time and Embedded Systems JOHN A. STANKOVIC

    E-print Network

    Narasimhan, Priya

    Real-Time and Embedded Systems JOHN A. STANKOVIC University of Massachusetts, Amherst stankovic and complexities. At least three major trends in the real-time and embedded systems field have had a ma- jor impact and debugging platforms. Embedded systems may or may not have real-time constraints. Hard real-time systems

  18. 76 FR 42536 - Real-Time System Management Information Program

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-19

    ...determining the quality of the real-time...Real-Time System Management Information...technology or system design requirements...measuring the quality of information...measuring the quality of the real-time...aspects of system design or...Real-Time System Management...

  19. Temporal logics and real time expert systems.

    PubMed

    Blom, J A

    1996-10-01

    This paper introduces temporal logics. Due to the eternal compromise between expressive adequacy and reasoning efficiency that must decided upon in any application, full (first order logic or modal logic based) temporal logics are frequently not suitable. This is especially true in real time expert systems, where a fixed (and usually small) response time must be guaranteed. One such expert system, Fagan's VM, is reviewed, and a delineation is given of how to formally describe and reason with time in medical protocols. It is shown that Petri net theory is a useful tool to check the correctness of formalised protocols. PMID:8894390

  20. Real-time interactive treatment planning.

    PubMed

    Otto, Karl

    2014-09-01

    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

  1. 17 CFR 43.3 - Method and timing for real-time public reporting.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

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

  2. 17 CFR 43.3 - Method and timing for real-time public reporting.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

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

  3. 17 CFR 43.3 - Method and timing for real-time public reporting.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

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

  4. CIESE Real Time Data Projects: Tsunami Surge

    NSDL National Science Digital Library

    2012-04-14

    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.

  5. Visualizations for Real-time Pricing Demonstration

    SciTech Connect

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

    2014-10-13

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

  6. Real time enhancement of obscured infrared imagery

    NASA Astrophysics Data System (ADS)

    Craine, E. R.; Seeley, G. W.

    1985-01-01

    A real-time three-dimensional video system consisting of a video image manipulator (VIM) and a thermal IR imager, was evaluated for its ability to enhance low contrast images of an obscured target. The effectiveness of the VIM was determined, using a thermally correct model of a tank, both unobscured and obscured by smoke in the optical path, and comparing the images from conventional display and the images processed by the VIM system. It was shown that the real-time enhancement provided by the VIM system results in a significant improvement in low contrast target detectability. This type of image display is of great potential value to military operators of electrooptical imaging systems when optimal, high speed performance is a critical element.

  7. Distributed Real-Time Computing with Harness

    SciTech Connect

    Di Saverio, Emanuele [University of Rome 'Tor Vergata', Rome, Italy; Cesati, Marco [University of Rome 'Tor Vergata', Rome, Italy; Di Biagio, Christian [MBDA Italia SPA, Rome, Italy; Pennella, Guido [MBDA Italia SPA, Rome, Italy; Engelmann, Christian [ORNL

    2007-01-01

    Modern parallel and distributed computing solutions are often built onto a ''middleware'' software layer providing a higher and common level of service between computational nodes. Harness is an adaptable, plugin-based middleware framework for parallel and distributed computing. This paper reports recent research and development results of using Harness for real-time distributed computing applications in the context of an industrial environment with the needs to perform several safety critical tasks. The presented work exploits the modular architecture of Harness in conjunction with a lightweight threaded implementation to resolve several real-time issues by adding three new Harness plug-ins to provide a prioritized lightweight execution environment, low latency communication facilities, and local timestamped event logging.

  8. System Equivalent for Real Time Digital Simulator

    NASA Astrophysics Data System (ADS)

    Lin, Xi

    2011-07-01

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

  9. Real-Time Demand Side Energy Management 

    E-print Network

    Victor, A.; Brodkorb, M.

    2006-01-01

    Real-Time Demand Side Energy Management Annelize Victor Michael Brodkorb Sr. Business Consultant Business Development Manager Aspen Technology, Inc. Aspen Technology España, S.A. Houston, TX Barcelona, Spain ABSTRACT To remain... competitive, manufacturers must capture opportunities to increase bottom-line profitability. The goal of this paper is to present a new methodology for reducing energy costs – “Demand-Side Energy Management.” Learn how process manufacturers assess energy...

  10. Activation instanton in real-time formalism

    NASA Astrophysics Data System (ADS)

    Kolokolov, I. V.; Trung, Nguyen Thanh

    2014-06-01

    In this paper, we study the dynamics of the activation of a Brownian particle using the path integral formalism in real time. Along with the construction of the saddle-point (instanton) solutions, we develop the formalism allowing to calculate the effect of the fluctuations near this solution in detail. In particular, it is shown that there is a soft mode for which the integration is not Gaussian and just this mode is responsible for the finite probability flux.

  11. Salmonella real-time PCR-Nachweis

    Microsoft Academic Search

    B. Malorny; A. Anderson; I. Huber

    2007-01-01

    :  Salmonella belongs to the most important bacterial pathogens worldwide causing disease in humans and animals mainly by the oral uptake\\u000a of contaminated food. Consequently, detection methodologies for Salmonella from food items are meaningful for routine laboratories. Here, we describe two different real-time PCR based methods for\\u000a the detection of Salmonella in food. The procedure begins with a cultural pre-enrichment in

  12. Interactive real-time motion blur

    Microsoft Academic Search

    Matthias M. Wloka; Robert C. Zeleznik

    1996-01-01

    Motion blurring fast-moving objects is highly desirable for virtualenvironments and 3D user interfaces. However, all currently knownalgorithms to generate motion blur are too slow for inclusion in interactive3D applications.We introduce a new motion blur algorithm that works in 3D on aper-object basis. The algorithm operates in real-time even for complexobjects consisting of several thousand polygons. While it onlyapproximates true motion

  13. Real-Time Interpretation of Marine Resistivity

    Microsoft Academic Search

    W. J. Scott

    This paper describes the development of a real-time interpretation capability for the MICRO-WIP marine resistivity system. The program was carried out in 1987 by Hardy BBT Ltd. for Indian and Northern Affairs Canada (INAC). Scientific Authority for the project was Mr. RJ. Gowan of INAC. W.J. Scott of Hardy BBT was the project leader. The detection of sub-bottom permafrost and

  14. Real-time gradient-domain painting

    Microsoft Academic Search

    James McCann; Nancy S. Pollard

    2008-01-01

    We present an image editing program which allows artists to paint in the gradient domain with real-time feedback on megapixel-sized images. Along with a pedestrian, though powerful, gradient-painting brush and gradient-clone tool, we introduce an edge brush designed for edge selection and replay. These brushes, coupled with special blending modes, allow users to accomplish global lighting and contrast adjustments using

  15. Real-Time Object Detection for \\

    Microsoft Academic Search

    Dariu Gavrila; Vasanth Philomin

    1999-01-01

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

  16. A real-time face tracker

    Microsoft Academic Search

    Jie Yang; Alex Waibel

    1996-01-01

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

  17. Real-time simulation of a sailboat

    Microsoft Academic Search

    S. Nikiel

    2008-01-01

    Game programming and real-time simulation systems are usually based on key-framed and motion-capture animations. Introduction of HAVOK and AGEIA PhysX technologies released game developers from some burden of predefined animation paths and shifted problem to autonomous modeling of physics. Recent developments of graphic shader languages along with the interoperability of COLLADA opens path to interchange of geometry, textures and physics

  18. Approaching Real-time Network Traffic Classification

    Microsoft Academic Search

    Wei Li; Kaysar Abdin; Robert Dann; Andrew Moore

    Abstract. Recent research explored the feasibility of using,Machine Learning methods,to provide accurate network traffic classification. We further believe that these methods,can work on real-time Internet traffic with sufficient accuracy for practical applications. In this paper we present ANTc, a framework,for quasi-realtime statistical traffic classification. It essentially demultiplexes ,network flows, collects statistical features of the flows, and then allows classification of

  19. Visualizing Real-Time Network Resource Usage

    Microsoft Academic Search

    Ryan Blue; Cody Dunne; Adam Fuchs; Kyle King; Aaron Schulman

    2008-01-01

    We present NetGrok, a tool for visualizing computer network usage in real-time. NetGrok combines well-known information visualiza- tion techniques—overview, zoom & filter, details on demand—with net- work graph and treemap visualizations. NetGrok integrates these tools with a shared data store that can read PCAP-formatted network traces, capture traces from a live interface, and filter the data set dynamically by bandwidth,

  20. Open Source Real Time Operating Systems Overview

    Microsoft Academic Search

    Till Straumann; Till

    2001-01-01

    Modern control systems applications are often built on top of a real time\\u000aoperating system (RTOS) which provides the necessary hardware abstraction as\\u000awell as scheduling, networking and other services. Several open source RTOS\\u000asolutions are publicly available, which is very attractive, both from an\\u000aeconomic (no licensing fees) as well as from a technical (control over the\\u000asource code)

  1. Real-time image visualization for sensors

    Microsoft Academic Search

    David C. Anding; Alexander Szabo

    1996-01-01

    Real-time image visualization simulation for sensors operating against synthetic environments comprised of natural backgrounds, cultural features, mobile objects, and dynamic weather is now a reality. A commercial software product is available which is capable of providing sensor image visualization for any spectral filter from the visible through the far infrared. The produce is called SensorVisionTM and is a module of

  2. Real time volumetric ultrasound imaging system

    Microsoft Academic Search

    Olaf T. von Ramm; Stephen W. Smith

    1990-01-01

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

  3. Real-Time X-Ray Inspection

    NASA Technical Reports Server (NTRS)

    Bulthuis, Ronald V.

    1988-01-01

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

  4. Real-time contingency handling in MAESTRO

    NASA Technical Reports Server (NTRS)

    Britt, Daniel L.; Geoffroy, Amy L.

    1992-01-01

    A scheduling and resource management system named MAESTRO was interfaced with a Space Station Module Power Management and Distribution (SSM/PMAD) breadboard at MSFC. The combined system serves to illustrate the integration of planning, scheduling, and control in a realistic, complex domain. This paper briefly describes the functional elements of the combined system, including normal and contingency operational scenarios, then focusses on the method used by the scheduler to handle real-time contingencies.

  5. Real-time imaging of acoustic rectification

    NASA Astrophysics Data System (ADS)

    Danworaphong, S.; Kelf, T. A.; Matsuda, O.; Tomoda, M.; Tanaka, Y.; Nishiguchi, N.; Wright, O. B.; Nishijima, Y.; Ueno, K.; Juodkazis, S.; Misawa, H.

    2011-11-01

    We image gigahertz surface acoustic waves normally incident on a microscopic linear array of triangular holes—a generic "acoustic diode" geometry—with a real-time ultrafast optical technique. Spatiotemporal Fourier transforms reveal wave diffraction orders in k-space. Squared amplitude reflection and transmission coefficients for incidence on both sides of the array are evaluated and compared with numerical simulations. We thereby directly demonstrate acoustic rectification with an asymmetric structure.

  6. Real-time phase shift interference microscopy.

    PubMed

    Safrani, Avner; Abdulhalim, Ibrahim

    2014-09-01

    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

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

    E-print Network

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

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

    E-print Network

    Zhao, Tian

    It is Time to Get Real with Real-Time: In Search of the Balance between Tools, Patterns and Aspects demands for real-time systems are vastly outstripping the ability for developers to robustly design, implement, compose, integrate, validate, and enforce real-time constraints. It is essential

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

    E-print Network

    Monash University AUSTRALIA 1A Real Time DSP Sonar Echo Processor - IROS'2000 A Real Time DSP Sonar.ecse.monash.edu.au/centres/IRRC # Funded by an Australian Research Council Large Grant #12;Monash University AUSTRALIA 2A Real Time DSP University AUSTRALIA 3A Real Time DSP Sonar Echo Processor - IROS'2000 Introduction u Robot systems are often

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

    NASA Technical Reports Server (NTRS)

    Rosenschein, Stan

    1994-01-01

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

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

    Microsoft Academic Search

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

    2011-01-01

    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

  12. Evaluating Real-Time Java Features and Performance for Real-Time Embedded Systems

    Microsoft Academic Search

    Angelo Corsaro; Douglas C. Schmidt

    2002-01-01

    This paper provides two contributions to the study of programming languages and middleware for real-time and embedded applications. First, we present the empirical re- sults from applying the RTJPerf benchmarking suite to eval- uate the efficiency and predictability of several implementa- tions of the Real-time Specification for Java (RTSJ). Second, we describe the techniques used to develop jRate, which is

  13. Real-time monitoring system for microfluidics

    NASA Astrophysics Data System (ADS)

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

    2007-05-01

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

  14. Real Time - Mach Timers: Exporting Time to the User

    Microsoft Academic Search

    Stefan Savage; Hideyuki Tokuda

    1993-01-01

    The current CMU Mach 3.0 microkernel exports simple timestamp and delay abstractions throughhost get time() and a timeout parameter tomach msg(). While this is sufficient for many purposes, it does not provide the precision or generality required for a variety of real- time applications. In this paper we describe extensions to CMU's Mach 3.0 which provide users with flexible time-based

  15. Temporal protection in real-time operating systems

    Microsoft Academic Search

    Cliff Mercer; Ragunathan Rajkumar; Jim Zelenka

    1994-01-01

    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

  16. Subsystem real-time Time Dependent Density Functional Theory

    E-print Network

    Krishtal, Alisa; Pavanello, Michele

    2015-01-01

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

  17. Subsystem real-time time dependent density functional theory

    NASA Astrophysics Data System (ADS)

    Krishtal, Alisa; Ceresoli, Davide; Pavanello, Michele

    2015-04-01

    We present the extension of Frozen Density Embedding (FDE) formulation of subsystem Density Functional Theory (DFT) to real-time Time Dependent Density Functional Theory (rt-TDDFT). FDE is a DFT-in-DFT embedding method that allows to partition a larger Kohn-Sham system into a set of smaller, coupled Kohn-Sham systems. Additional to the computational advantage, FDE provides physical insight into the properties of embedded systems and the coupling interactions between them. The extension to rt-TDDFT is done straightforwardly by evolving the Kohn-Sham subsystems in time simultaneously, while updating the embedding potential between the systems at every time step. Two main applications are presented: the explicit excitation energy transfer in real time between subsystems is demonstrated for the case of the Na4 cluster and the effect of the embedding on optical spectra of coupled chromophores. In particular, the importance of including the full dynamic response in the embedding potential is demonstrated.

  18. Machine learning for real time remote detection

    NASA Astrophysics Data System (ADS)

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

    2010-10-01

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

  19. Quantum theory of the inverse Faraday effect

    NASA Astrophysics Data System (ADS)

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

    2014-01-01

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

  20. Real time visualization of quantum walk

    SciTech Connect

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

    2014-02-20

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

  1. Modeling Time Series Data of Real Systems

    E-print Network

    Dilip P. Ahalpara; Jitendra C. Parikh

    2006-07-14

    Dynamics of complex systems is studied by first considering a chaotic time series generated by Lorenz equations and adding noise to it. The trend (smooth behavior) is separated from fluctuations at different scales using wavelet analysis and a prediction method proposed by Lorenz is applied to make out of sample predictions at different regions of the time series. The prediction capability of this method is studied by considering several improvements over this method. We then apply this approach to a real financial time series. The smooth time series is modeled using techniques of non linear dynamics. Our results for predictions suggest that the modified Lorenz method gives better predictions compared to those from the original Lorenz method. Fluctuations are analyzed using probabilistic considerations.

  2. On Applying Imprecise Computation to Real-Time AI Systems

    E-print Network

    Chen, Ing-Ray

    , the exponential search time behaviour exhibited by AI programs makes them highly undesirable for real-timeOn Applying Imprecise Computation to Real-Time AI Systems ING-RAY CHEN Institute of Information for real-time systems where precise outputs are traded off for timely responses to system events

  3. Finding Response Times in a Real-Time System

    Microsoft Academic Search

    Mathai Joseph; Paritosh K. Pandya

    1986-01-01

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

  4. REAL-TIME TIME-FREQUENCY BASED BLIND SOURCE SEPARATION

    Microsoft Academic Search

    Scott Rickard; Radu Balan; Justinian Rosca

    2001-01-01

    We present a real-time version of the DUET algorithm for the blind separation of any number of sources using only two mixtures. The method applies when sources are W- disjoint orthogonal, that is, when the supports of the win- dowed Fourier transform of any two signals in the mixture are disjoint sets, an assumption which is justified in the Ap-

  5. Real-Time Flight Envelope Monitoring System

    NASA Technical Reports Server (NTRS)

    Kerho, Michael; Bragg, Michael B.; Ansell, Phillip J.

    2012-01-01

    The objective of this effort was to show that real-time aircraft control-surface hinge-moment information could be used to provide a robust and reliable prediction of vehicle performance and control authority degradation. For a given airfoil section with a control surface -- be it a wing with an aileron, rudder, or elevator -- the control-surface hinge moment is sensitive to the aerodynamic characteristics of the section. As a result, changes in the aerodynamics of the section due to angle-of-attack or environmental effects such as icing, heavy rain, surface contaminants, bird strikes, or battle damage will affect the control surface hinge moment. These changes include both the magnitude of the hinge moment and its sign in a time-averaged sense, and the variation of the hinge moment with time. The current program attempts to take the real-time hinge moment information from the aircraft control surfaces and develop a system to predict aircraft envelope boundaries across a range of conditions, alerting the flight crew to reductions in aircraft controllability and flight boundaries.

  6. Real-time design with peer tasks

    NASA Technical Reports Server (NTRS)

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

    1995-01-01

    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.

  7. An overview of the Rialto real-time architecture

    Microsoft Academic Search

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

    1996-01-01

    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

  8. Verifying Timing Properties for Distributed Real-Time Systems Using Timing Constraint Petri Nets

    Microsoft Academic Search

    Jeffrey J. P. Tsai; Stephen J. H. Yang; Yao-hsiung Chang; Eric Y. T. Juan

    1996-01-01

    Timing analysis is essential to the development of valid computer systems especially for a distributed real-time system. We present both static and dynamic analysis procedures to verify timing properties of distributed real-time systems using timing constraint Petri nets (TCPNs). With both derived static information and collected dynamic data, we can locate a faulty task in a distributed real-time system using

  9. Real-time data flow and product generating for GNSS

    NASA Technical Reports Server (NTRS)

    Muellerschoen, Ronald J.; Caissy, Mark

    2004-01-01

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

  10. A tool for modeling concurrent real-time computation

    NASA Technical Reports Server (NTRS)

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

    1990-01-01

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

  11. A Flexible Real-Time Architecture

    SciTech Connect

    WICKSTROM,GREGORY L.

    2000-08-17

    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.

  12. Real-time image visualization for sensors

    NASA Astrophysics Data System (ADS)

    Anding, David C.; Szabo, Alexander

    1996-05-01

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

  13. Real Time Simulation of Power Grid Disruptions

    SciTech Connect

    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

    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.

  14. Real-time applications of neural nets

    SciTech Connect

    Spencer, J.E.

    1989-05-01

    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.

  15. A novel compact real time radiation detector.

    PubMed

    Li, Shiping; Xu, Xiufeng; Cao, Hongrui; Tang, Shibiao; Ding, Baogang; Yin, Zejie

    2012-08-01

    A novel compact real time radiation detector with cost-effective, ultralow power and high sensitivity based on Geiger counter is presented. The power consumption of this detector which employs CMOS electro circuit and ultralow-power microcontroller is down to only 12.8 mW. It can identify the presences of 0.22 ?Ci (60)Co at a distance of 1.29 m. Furthermore, the detector supports both USB bus and serial interface. It can be used for personal radiation monitoring and also fits the distributed sensor network for radiation detection. PMID:22738843

  16. Real-time failure control (SAFD)

    NASA Technical Reports Server (NTRS)

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

    1990-01-01

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

  17. Baton Rouge Complex Steam Real Time Optimization

    E-print Network

    Iyun, T.

    2014-01-01

    Baton Rouge Complex Steam Real Time Optimization IETC 2014 New Orleans, Louisiana Tope Iyun ExxonMobil Chemical Company May 22, 2014 ESL-IE-14-05-32 Proceedings of the Thrity-Sixth Industrial Energy Technology Conference New Orleans, LA. May 20...-23, 2014 Proprietary 2 Agenda • Baton Rouge Complex • Steam System Overview • Energy Efficiency Improvement Strategy • Site-Wide Steam System Optimization • Results • Benefits/Wrap-Up ESL-IE-14-05-32 Proceedings of the Thrity-Sixth Industrial Energy...

  18. Low cost real time interactive analysis system

    NASA Technical Reports Server (NTRS)

    Stetina, F.

    1988-01-01

    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.

  19. Open Source Real Time Operating Systems Overview

    SciTech Connect

    Straumann, Till

    2001-12-11

    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.

  20. Systems Analyze Water Quality in Real Time

    NASA Technical Reports Server (NTRS)

    2010-01-01

    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.

  1. Faraday rotation in graphene

    E-print Network

    I. V. Fialkovsky; D. V. Vassilevich

    2012-11-29

    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.

  2. A Time-Triggered Ethernet Protocol for Real-Time CORBA

    Microsoft Academic Search

    Stefan Lankes; Andreas Jabs; Michael Reke

    2002-01-01

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

  3. Real-time fractal signal processing in the time domain

    NASA Astrophysics Data System (ADS)

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

    2013-01-01

    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.

  4. Real-time CHAMP (RTC) infrared scene generation program

    Microsoft Academic Search

    Dennis R. Crow; Charles F. Coker

    2001-01-01

    The Real-Time CHAMP (RTC) program is a computer simulation used to provide time varying high-fidelity infrared simulations of airborne vehicles and backgrounds in real- time. RTC is currently being utilized to provide real-time infrared imagery to support closed-loop digital and hardware-in-the-loop simulations. RTC computational algorithms take advantage of parametric databases created by its non real-time companion code (CHAMP--Composite Hardbody and

  5. Real-Time Data Services for Cyber Physical Systems

    Microsoft Academic Search

    Kyoung-don Kang; Sang Hyuk Son

    2008-01-01

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

  6. A General Model for Recurring Real-Time Tasks

    Microsoft Academic Search

    Sanjoy K. Baruah

    1998-01-01

    A new model for hard-real-time tasks --- the recurringreal-time task model --- is introduced. Thismodel generalizes earlier models such as the sporadictask model and the generalized multiframe task model.An algorithm is presented for feasibility-analysis of asystem of independent recurring real-time tasks in apreemptive uniprocessor environment.Keywords: Hard-real-time scheduling# conditionalcode# feasibility analysis# processor demand criteria.1 IntroductionReal-time computer...

  7. The real-time operating system of MARS

    Microsoft Academic Search

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

    1989-01-01

    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.

  8. Requirements specification of distributed hard real-time operating systems

    Microsoft Academic Search

    ManSang Chung; Heonshik Shin

    1991-01-01

    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

  9. Real Time Control Design for Mobile Robot Fault Tolerant Control.

    E-print Network

    Kuehnlenz, Kolja

    Real Time Control Design for Mobile Robot Fault Tolerant Control. Introducing the ARTEMIC Powered://robotics.viviti.com Abstract - Real-time applications should timely deliver synchronized data-sets, minimize latency and jitter as well as the capability to continue operating after a fault occurred. This paper introduces a real-time

  10. Abstraction and Completeness for Real-Time Maude

    E-print Network

    Ã?lveczky, Peter Csaba

    method (for example, Real-Time Maude's (timed) breadth-first search, or LTL model checking) sound if any. This makes breadth-fist search for the violation of an invariant complete. For general real-time systemsWRLA 2006 Abstraction and Completeness for Real-Time Maude Peter Csaba ¨Olveczky a,b and Jos

  11. Learning in Real-Time Search: A Unifying Framework

    Microsoft Academic Search

    Vadim Bulitko; Greg Lee

    2006-01-01

    Real-time search methods are suited for tasks in which the agent is interacting with an initially unknown environment in real time. In such simultaneous planning and learning problems, the agent has to select its actions in a limited amount of time, while sensing only a local part of the environ- ment centered at the agent's current location. Real-time heuristic search

  12. Learning in Real-Time Search: A Unifying Framework

    Microsoft Academic Search

    V. Bulitko; G. Lee

    2011-01-01

    Real-time search methods are suited for tasks in which the agent is interacting with an initially unknown environment in real time. In such simultaneous planning and learning problems, the agent has to select its actions in a limited amount of time, while sensing only a local part of the environment centered at the agents current location. Real-time heuristic search agents

  13. PARALLEL REAL-TIME COMPLEXITY THEORY STEFAN D. BRUDA

    E-print Network

    Bruda, Stefan D.

    PARALLEL REAL-TIME COMPLEXITY THEORY by STEFAN D. BRUDA A thesis submitted to the Department We present a new complexity theoretic approach to real-time computations. We define timed -languages of real-time computations that are meaningful in prac- tice. To our knowledge, such a practically

  14. 1 Automatic Code Generation for Real-Time Convex Optimization

    E-print Network

    Press, 2009. This chapter concerns the use of convex optimization in real-time embedded systems problems. In real-time embedded convex optimization the same optimization problem is solved many times generation system for real-time embedded convex optimization. Such a system scans a description

  15. Towards platform independent models of real time operating systems

    Microsoft Academic Search

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

    2004-01-01

    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

  16. Testing Real-Time Systems Using TINA

    NASA Astrophysics Data System (ADS)

    Adjir, Noureddine; de Saqui-Sannes, Pierre; Rahmouni, Kamel Mustapha

    The paper presents a technique for model-based black-box conformance testing of real-time systems using the Time Petri Net Analyzer TINA. Such test suites are derived from a prioritized time Petri net composed of two concurrent sub-nets specifying respectively the expected behaviour of the system under test and its environment.We describe how the toolbox TINA has been extended to support automatic generation of time-optimal test suites. The result is optimal in the sense that the set of test cases in the test suite have the shortest possible accumulated time to be executed. Input/output conformance serves as the notion of implementation correctness, essentially timed trace inclusion taking environment assumptions into account. Test cases selection is based either on using manually formulated test purposes or automatically from various coverage criteria specifying structural criteria of the model to be fulfilled by the test suite. We discuss how test purposes and coverage criterion are specified in the linear temporal logic SE-LTL, derive test sequences, and assign verdicts.

  17. Neutron monitor database in real time

    NASA Astrophysics Data System (ADS)

    Kozlov, Valery; Kudela, Karel; Starodubtsev, Sergei; Turpanov, Alexey; Usoskin, Ilya; Yanke, Victor

    2003-09-01

    A first distributed Real Time Cosmic Ray Database using measurements of several neutron monitors is presented. 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 original cosmic ray as well as all housekeeping and technical data necessary for scientific data analysis. Currently the database includes Lomnicky Stit, Moscow, Oulu, Tixie Bay, Yakutsk stations and it is opened for other neutron monitors. The main database server is located in IKFIA SB RAS (Yakutsk) but there will be several mirrors of the database. The datbase and all its mirrors are updated on the nearly real-time (1 hour) basis. The data access software includes WWW-interface, Perl scipts and C library, which may be linked to a user program. Most of frequently used functions are implemented to make it operable to users without SQL language knowledge. A draft of the data representation standard is suggested, based on common practice of neutron monitor community. The database engine is freely distributed open-sourced PostgreSQL server coupled with a set of replication tools developed at Bioengineering division of the IRCCS E. Medea, Italy.

  18. REal-time COsmic Ray Database (RECORD)

    NASA Astrophysics Data System (ADS)

    Usoskin, I.; Kozlov, Valery; Ksenofontov, Leonid, Kudela, Karel; Starodubtsev, Sergei; Turpanov, Alexey; Yanke, Victor

    2003-07-01

    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 necessary for scientific data analysis. Currently the database includes Lomn.Stit, Moscow, Oulu; Tixie Bay, Yakutsk stations. The main database server is located in IKFIA SB RAS (Yakutsk) but there will be several mirrors of the database. The database and all its mirrors are up dated on the nearly real-time (1 hour) basis. The data access software includes WWW-interface, Perl scripts and C library, which may be linked to a user program. Most of frequently used functions are implemented to make it operable to users without SQL language knowledge. A draft of the data representation standard is suggested, based on common practice of neutron monitor community. The database engine is freely distributed open-sourced PostgreSQL server coupled with a set of replication to ols developed at Bio engineering division of the IRCCS E.Medea, Italy.

  19. Real-time virtual room acoustic simulation

    NASA Astrophysics Data System (ADS)

    Carneal, James P.; Johnson, Jan; Johnson, Troge; Johnson, Marty

    2003-10-01

    A realistic virtual room acoustic simulation has been implemented on a PC-based computer in near real-time. Room acoustics are calculated by the image source method using realistic absorption coefficients for a variety of realistic surfaces and programmed in MATLAB. The resulting impulse response filters are then applied in near real-time using fast convolution DSP techniques using data being read from a CD-ROM. The system was implemented in a virtual acoustic room facility. Optimizations have been performed to retain the realistic virtual room effect while minimizing computations through limited psycho-acoustic testing. In general, realistic anechoic to reverberant virtual rooms have been re-created with six 8192 coefficient filters. To provide realistic simulations, special care must be taken to accurately reproduce the low frequency acoustics. Since the virtual room acoustic facility was not totally anechoic (as are most anechoic chambers), inverse filters were applied to compensate for over-amplified acoustics at frequencies below 350 Hz.

  20. Real-time Raman sensing without spectrometer

    NASA Astrophysics Data System (ADS)

    Kim, Min Ju; Kim, Sungho; Yang, Timothy K.; Kumar, Dinesh; Bae, Sung Chul

    2015-03-01

    Raman spectroscopy has been a powerful tool in various fields of science and technology ranging from analytical chemistry to biomedical imaging. In spite of unique features, Raman spectroscopy has also some limitations. Among them are weak Raman signal compared to strong fluorescence and relatively complicated setup with expensive and bulky spectrometer. In order to increase the sensitivity of Raman technique, many clever attempts have been made and some of them were very successful including CARS, SRS, and so on. However, these still requires expensive and more complicated setup. In this work, we have attempted to build a real-time compact Raman sensor without spectrometer. Conventional spectrometer was replaced with a narrow-band optical filter and alternatively modulated two lasers with slightly different wavelengths. At one laser, Raman signal from a target molecule was transmitted through the optical filter. At the other laser, this signal was blocked by the optical filter and could not be detected by photon detector. The alternative modulation of two lasers will modulate the Raman signal from a target molecule at the same modulation frequency. This modulated weak Raman signal was amplified by a lock-in amplifier. The advantages of this setup include compactness, low cost, real-time monitoring, and so on. We have tested the sensitivity of this setup and we found that it doesn't have enough sensitivity to detect single molecule-level, but it is still good enough to monitor the change of major chemical composition in the sample.

  1. 3D MR imaging in real time

    NASA Astrophysics Data System (ADS)

    Guttman, Michael A.; McVeigh, Elliot R.

    2001-05-01

    A system has been developed to produce live 3D volume renderings from an MR scanner. Whereas real-time 2D MR imaging has been demonstrated by several groups, 3D volumes are currently rendered off-line to gain greater understanding of anatomical structures. For example, surgical planning is sometimes performed by viewing 2D images or 3D renderings from previously acquired image data. A disadvantage of this approach is misregistration which could occur if the anatomy changes due to normal muscle contractions or surgical manipulation. The ability to produce volume renderings in real-time and present them in the magnet room could eliminate this problem, and enable or benefit other types of interventional procedures. The system uses the data stream generated by a fast 2D multi- slice pulse sequence to update a volume rendering immediately after a new slice is available. We demonstrate some basic types of user interaction with the rendering during imaging at a rate of up to 20 frames per second.

  2. Real-time sensor data validation

    NASA Technical Reports Server (NTRS)

    Bickmore, Timothy W.

    1994-01-01

    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.

  3. A real-time radiation mapping system

    SciTech Connect

    Scoggins, W.A.; VanEtten, D.M.

    1988-01-01

    A prototype of a real-time radiation mapping system, Ranger, was developed to respond to an accident involving the release of plutonium for the Department of Energy's Accident Response Group. In 1987 Ranger demonstrated that it can provide an efficient method of monitoring large areas of land for radioactive contamination. With the experience gained from the operation of the prototype, the external computer and software are being upgraded in order to obtain a fully operational system. The new system uses the prototype's commercially available line-of-sight microwave system for determining position and the same radiation detection instruments. The data obtained from the radiation detection instrument(s) are linked back to the external computer along with the relative position of the measurement through the ranging system. The data are displayed on a gridded map as colored circles and permanently stored in real-time. The different colors represent different contamination levels. Contours can be drawn using the permanently stored data. 4 figs.

  4. PCs stir reliability, real-time concerns

    SciTech Connect

    Strothman, J. [ed.

    1994-11-01

    While pre-Christmas price wars regularly boost personal computer sales this time of year, price cuts alone won`t cause process control systems designers to open their wallets and buy PCs. User studies and user feedback to process control equipment suppliers show several other issues continue to rank higher than price including: (1) Hardware and software reliability; (2) easy-to-use user interfaces; (3) ability to do multitasking; (4) need for real-time updates. These and several other non-price issues - including open versus proprietary systems, slower scan rates from PCs compared to programmable controllers, and assurances that the PC will work in an industrial environment - scored high in a study authored earlier this year by Jesse Yoder, owner of Idea Network, Clinton, NJ. The report, titled {open_quotes}The World Market for Process Control Equipment,{close_quotes} was written for FIND/SVP, a New York City market research firm.

  5. Real time analysis of tokamak discharge parameters

    SciTech Connect

    Ferron, J.R.; Strait, E.J. (General Atomics, San Diego, California 92186-9784 (United States))

    1992-10-01

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

  6. Real time analysis of tokamak discharge parameters

    SciTech Connect

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

    1992-03-01

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

  7. Ames Lab 101: Real-Time 3D Imaging

    ScienceCinema

    Zhang, Song

    2012-08-29

    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.

  8. Ames Lab 101: Real-Time 3D Imaging

    SciTech Connect

    Zhang, Song

    2010-01-01

    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.

  9. Feedback Thermal Control for Real-time Systems

    Microsoft Academic Search

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

    2010-01-01

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

  10. The synthesis of real-time systems from processing graphs

    Microsoft Academic Search

    Steve Goddard; Kevin Jeffay

    2000-01-01

    Directed graphs, called processing graphs, are a standard design aid for complex real-time systems. The primary problem in developing real-time systems with processing graphs is transforming the processing graph into a predictable real-time system in which latency can be managed. Software engineering techniques are combined with real-time scheduling theory to solve this problem. In the parlance of software engineering methodologies,

  11. Real-time communication for distributed plasma control systems

    Microsoft Academic Search

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

    2008-01-01

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

  12. A Survey of Real-Time Operating Systems -- Draft

    Microsoft Academic Search

    Bodhisattwa Mukherjee; Karsten Schwan; Kaushik Ghosh

    1993-01-01

    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

  13. Development of educational material for real-time operating system

    Microsoft Academic Search

    Akiko Yoshizaki; Naohiko Shimizu

    2012-01-01

    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

  14. Working with Real-Time Systems Technical Report

    Microsoft Academic Search

    Mauricio Araya

    This report is a description of the important concepts and reasons that working with real-time requirements introduce. The document introduce the real-time concept, including a state of art discussion about hardness, deadline handling, embedded systems and real-time operating systems. Also, a practical experience is proposed to realize which are the compli- cations of a real-time system, and how unsuitable is

  15. Passive Global, Real-Time TEC Monitoring

    NASA Astrophysics Data System (ADS)

    Pongratz, M. B.

    2002-12-01

    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).

  16. Real Time Speed Estimation from Monocular Video

    NASA Astrophysics Data System (ADS)

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

    2012-07-01

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

  17. Real-time Remote Sensing of Snowmobiles Emissions at

    E-print Network

    Denver, University of

    Real-time Remote Sensing of Snowmobiles Emissions at Yellowstone National Park: An Oxygenated Fuel 68509 #12;Real-time Remote Sensing of Snowmobile Emissions at Yellowstone National Park 2 Executive reported toluene measurements with r2 = 0.93 with an equation ppm toluene = 0.105 * ppm HC - 619. #12;Real-time

  18. Real-Time Security Assessment of Angle Stability Using Synchrophasors

    E-print Network

    Real-Time Security Assessment of Angle Stability Using Synchrophasors Final Project Report Power 1996 PSERC #12;Real-Time Security Assessment of Angle Stability and Voltage Stability Using Engineering Research Center (PSERC) re- search project S-31, titled "Real-Time Security Assessment of Angle

  19. Real Time PMU-Based Stability Monitoring Final Project Report

    E-print Network

    Real Time PMU-Based Stability Monitoring Final Project Report Power Systems Engineering Research Center Empowering Minds to Engineer the Future Electric Energy System #12;#12;Real Time PMU for the Power Systems Engineering Research Center (PSERC) research project titled "Real Time PMU-based Stability

  20. Real-Time Traffic Information for Emergency Evacuation Operations

    E-print Network

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

  1. Real-time Coastal Observation Network (ReCON)

    E-print Network

    Real-time Coastal Observation Network (ReCON) The need for development of regional coastal. High bandwidth, wireless Ethernet-based system. Real-time, secure data access. Universal sensor real-time whole water column observations of physical, chemical, and biological variables. The Re

  2. Real-Time Garbage Collection for Java Martin Schoeberl

    E-print Network

    Real-Time Garbage Collection for Java Martin Schoeberl Institute of Computer Engineering Vienna not used in real-time sys- tems due to the unpredictable temporal behavior of current implementations memory man- agement. However, garbage collection is considered unsuit- able for real-time systems due

  3. REAL-TIME SYSTEM DESIGN UNDER PHYSICAL AND RESOURCE CONSTRAINTS

    E-print Network

    Lemmon, Michael

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

  4. Real-Time Monocular SLAM with Straight Lines

    E-print Network

    Davison, Andrew

    Real-Time Monocular SLAM with Straight Lines Paul Smith , Ian Reid and Andrew Davison Department,ian]@robots.ox.ac.uk, ajd@doc.ic.ac.uk Abstract 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

  5. Real-Time Analysis of Round-based Distributed Algorithms

    E-print Network

    Real-Time Analysis of Round-based Distributed Algorithms Alexander K¨o�ler, Heinrich Moser, Ulrich,moser,s}@ecs.tuwien.ac.at I. DISTRIBUTED COMPUTING VS. REAL-TIME SYSTEMS RESEARCH Designing sound fault-tolerant distributed real-time systems requires a scientific basis, which allows to cope with three very different

  6. RTTES: Real-time search in dynamic environments

    Microsoft Academic Search

    Cagatay Undeger; Faruk Polat

    2007-01-01

    In this paper we propose a real-time search algo- rithm called Real-Time Target Evaluation Search (RTTES) for the problem of searching a route in grid worlds from a starting point to a static or dynamic target point in real- time. The algorithm makes use of a new effective heuristic method which utilizes environmental information to success- fully find solution paths

  7. Active Search for Real-Time Vision Andrew J. Davison

    E-print Network

    Davison, Andrew

    Active Search for Real-Time Vision Andrew J. Davison Department of Computing, Imperial College been understood that guided search is of ben- efit in real-time tracking: rather than searching. Such consid- erations are of importance in all practical real-time vision systems, where the processing

  8. Real-time Principal Components' Pursuit Chenlu Qiu, Namrata Vaswani

    E-print Network

    Vaswani, Namrata

    Real-time Principal Components' Pursuit Chenlu Qiu, Namrata Vaswani Department of Electrical Vaswani Real-time PCP 1/ 19 #12;Principal Component Analysis Principal Component Analysis (PCA dataset. Sensitive to outliers and corruptions. Chenlu Qiu, Namrata Vaswani Real-time PCP 2/ 19 #12

  9. 17 CFR 23.205 - Real-time public reporting.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 2014-04-01 2014-04-01 false Real-time public reporting. 23.205 Section 23...Dealers and Major Swap Participants § 23.205 Real-time public reporting. (a) Real-time public reporting of swap transaction and...

  10. 17 CFR 38.157 - Real-time market monitoring.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...2014-04-01 2014-04-01 false Real-time market monitoring. 38.157...Compliance With Rules § 38.157 Real-time market monitoring. A designated contract market must conduct real-time market monitoring of all...

  11. NSTX Real-Time Control GUI User's Guide

    E-print Network

    Princeton Plasma Physics Laboratory

    NSTX Real-Time Control GUI User's Guide March 28, 2008 #12;This document is meant to describe the use of the Power Supply Real-Time Control (PSRTC) Graphical User Interface (GUI), shown below. Aside supply real time control (PSRTC), and gas control (GISCTL). The COE/PCEIC GUI is the main user interface

  12. Real-Time Observation of Tubule Formation from Amorphous Carbon

    E-print Network

    Powles, Rebecca

    Real-Time Observation of Tubule Formation from Amorphous Carbon Nanowires under High-Bias Joule was observed in real time in a high- resolution transmission electron microscope. The crystallization on the nanotube surface.16 All of the previous observations were conducted on the post-grown samples, and real-time

  13. 17 CFR 23.205 - Real-time public reporting.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 2013-04-01 2013-04-01 false Real-time public reporting. 23.205 Section 23...Dealers and Major Swap Participants § 23.205 Real-time public reporting. (a) Real-time public reporting of swap transaction and...

  14. On real-time physical systems Marco L. Della Vedova

    E-print Network

    Paris-Sud XI, Université de

    On real-time physical systems Marco L. Della Vedova University of Pavia Pavia, Italy marco of Pavia Pavia, Italy tullio.facchinetti@unipv.it Abstract This paper introduces a class of real-time systems de- noted as Real-Time Physical Systems (RTPS), in which a physical quantity of interest

  15. 17 CFR 38.157 - Real-time market monitoring.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...2013-04-01 2013-04-01 false Real-time market monitoring. 38.157...Compliance With Rules § 38.157 Real-time market monitoring. A designated contract market must conduct real-time market monitoring of all...

  16. ANZA Real-time Seismic Network The ANZA Broadband and

    E-print Network

    Vernon, Frank

    ANZA Real-time Seismic Network 1 The ANZA Broadband and Strong Motion Seismic Network 1-of-the-art broadband and strong motion sensors with 24-bit dataloggers combined with real-time telemetry to monitor-resolution three-component seismic data for all earthquakes (Vernon, 1989), provide real-time data

  17. ROBOT MOTION PLANNING USING REAL-TIME HEURISTIC SEARCH

    E-print Network

    Ruml, Wheeler

    ROBOT MOTION PLANNING USING REAL-TIME HEURISTIC SEARCH BY Jarad Cannon B.S., University of New . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 iv #12;3 PREVIOUS WORK 21 3.1 Real-Time Search Algorithms . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.1.1 Real-Time A (RTA) . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.1.2 Local Search

  18. Real-time support for high performance aircraft operation

    NASA Technical Reports Server (NTRS)

    Vidal, Jacques J.

    1989-01-01

    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.

  19. Scheduling Security-Critical Real-Time Applications on Clusters

    E-print Network

    Xie, Tao

    Scheduling Security-Critical Real-Time Applications on Clusters Tao Xie, Member, IEEE, and Xiao Qin performance. In recognition that many applications running on clusters demand both real-time performance strategy for clusters (SAREC), which integrates security requirements into the scheduling for real- time

  20. Predictable Communication Protocol Processing in RealTime Mach

    E-print Network

    Rajkumar, Ragunathan "Raj"

    Predictable Communication Protocol Processing in Real­Time Mach Chen Lee, Katsuhiko Yoshida Scheduling of many different kinds of activities takes place in distributed real­time and multimedia systems processing in real­time systems. Communication protocol processing takes a rela­ tively substantial amount

  1. Measuring OS Support for Real-time CORBA ORBs

    E-print Network

    Schmidt, Douglas C.

    and evaluates the suitability of real- time operating systems, VxWorks and LynxOS, and general- purpose makes it unsuitable for real-time applications. Both LynxOS and VxWorks do enable predictable- dictability of TAO in several real-time operating systems, i.e., VxWorks and LynxOS, and operating systems

  2. Assigning Real-Time Tasks to Homogeneous Multiprocessor Systems

    E-print Network

    Burchard, Almut

    Assigning Real-Time Tasks to Homogeneous Multiprocessor Systems Almut Burchard Jorg Liebeherr scheduling of real-time tasks on multiprocessor systems is known to be computationally intractable for large task sets. Any practical scheduling algorithm for assigning real-time tasks to a multiprocessor system

  3. Observability Checking to Enhance Diagnosis of Real Time Electronic Systems

    E-print Network

    Paris-Sud XI, Université de

    Observability Checking to Enhance Diagnosis of Real Time Electronic Systems Abstract This paper the observability property in a real time electronic system in order to improve its diagnosis capacity. To reach this objective, we have set up an iterative modeling process. The model of the real time electronic system

  4. Specifying and Verifying Requirements of Real-Time Systems

    Microsoft Academic Search

    Anders P. Ravn; Hans Rischel; Kirsten Mark Hansen

    1993-01-01

    An approach to specification of requirements and verification of design for real-time systems is presented. A system is defined by a conventional mathematical model for a dynamic system where application specific states denote functions of real time. Specifications are formulas in duration calculus, a real-time interval logic, where predicates define durations of states. Requirements define safety and functionality constraints on

  5. Adaptive Fault Tolerance in Real Time Cloud Computing Sheheryar Malik

    E-print Network

    Paris-Sud XI, Université de

    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

  6. A Virtual Platform for Multiprocessor Real-Time Embedded Systems

    E-print Network

    Wagner, Flávio Rech

    A Virtual Platform for Multiprocessor Real-Time Embedded Systems Elias T. Silva Jr2 Daniel BarcelosC). The environment is aimed at the development of multithread real-time embedded applications in Java language and embedded systems. General Terms Design, Performance, Experimentation. Keywords Embedded applications, Real-time

  7. Application Experiences with a Real-Time Java Processor

    E-print Network

    : In this paper we present three different industrial real-time applications that are based on an embedded JavaApplication Experiences with a Real-Time Java Processor Martin Schoeberl Institute of Computer to legacy applications or for real-time aspects or standard Internet protocols are used. We present

  8. A Real-Time Java Chip-Multiprocessor CHRISTOF PITTER

    E-print Network

    for embedded systems. In this paper, we introduce a real-time Java multiprocessor called JopA Real-Time Java Chip-Multiprocessor CHRISTOF PITTER Vienna University of Technology, Austria arbitration policies are presented, evaluated, and compared with respect to their real-time and average

  9. The Design and Performance of Real-Time Java Middleware

    E-print Network

    Schmidt, Douglas C.

    for real-time and embedded applications. The behavior of these applications is often constrained. This paper provides two contributions to the study of languages and middleware for real-time and embedded embedded systems are increasingly being connected via wireless and wireline networks. Designing real-time

  10. Real-Time Programming and L4 Microkernels Sergio Ruocco

    E-print Network

    Heiser, Gernot

    .ruocco@nicta.com.au Abstract L4-embedded is a microkernel successfully deployed in mobile devices with soft real-time the various aspects of real-time programming on L4-embedded, focusing on the issues caused by the ex- treme. Introduction The most challenging front of real-time today are mobile embedded systems. They run fully

  11. Energy Reduction in Distributed Real-Time Embedded Applications

    E-print Network

    Wagner, Flávio Rech

    Energy Reduction in Distributed Real-Time Embedded Applications Elias T. Silva Jr1 , Flávio R. The development of Distributed Real-Time Embedded Systems requires solutions that are able to address constraints the concept. 1. Introduction Real-time embedded systems are expanding and growing in complexity, imposing

  12. A Real-Time Scheduling Framework for Embedded Systems

    E-print Network

    Paris-Sud XI, Université de

    A Real-Time Scheduling Framework for Embedded Systems with environmental energy harvesting Hussein may be minor; how- ever, in the so-called hard real-time embedded systems, energy lack means a failure Lebanese University, IUT Saida, Lebanon. rafichajj@hotmail.com Abstract Real-time scheduling refers

  13. COMPOSITIONAL FRAMEWORK FOR REAL-TIME EMBEDDED SYSTEMS A DISSERTATION

    E-print Network

    Plotkin, Joshua B.

    COMPOSITIONAL FRAMEWORK FOR REAL-TIME EMBEDDED SYSTEMS Insik Shin A DISSERTATION in Computer their pride in all my accomplish- ments. v #12;ABSTRACT COMPOSITIONAL FRAMEWORK FOR REAL-TIME EMBEDDED SYSTEMS- bedded systems are real-time and resource-constrained. As embedded systems become more complex due

  14. Mining, Modeling, and Analyzing Real-Time Social Trails 

    E-print Network

    Kamath, Krishna Y

    2013-05-28

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

  15. A new checkpoint mechanism for real time operating systems

    Microsoft Academic Search

    Santiago Rodríquez; Antonio Pérez; Rafael Méndez

    1997-01-01

    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.

  16. Challenges for future real-time operating systems

    Microsoft Academic Search

    Tom Hand

    1991-01-01

    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.

  17. Real-time CHAMP (RTC) infrared scene generation program

    NASA Astrophysics Data System (ADS)

    Crow, Dennis R.; Coker, Charles F.

    2001-08-01

    The Real-Time CHAMP (RTC) program is a computer simulation used to provide time varying high-fidelity infrared simulations of airborne vehicles and backgrounds in real- time. RTC is currently being utilized to provide real-time infrared imagery to support closed-loop digital and hardware-in-the-loop simulations. RTC computational algorithms take advantage of parametric databases created by its non real-time companion code (CHAMP--Composite Hardbody and Missile Plume) to allow accurate infrared imagery to be generated at real-time frame rates.

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

    E-print Network

    1 of 30 Timed Multitasking for Real-Time Embedded Software Software in real-time embedded systems by a real-time operating system (RTOS). Typically, an RTOS offers as control of these timing properties one innovations in real-time program- ming models such as port-based objects (PBO) [1] and Giotto [2] are examples

  19. Extending Real-time GPS Data Capture to Real-time Office Data Processing

    Microsoft Academic Search

    Justin Smith; Paul Denys

    The use of the Global Positioning System (GPS) for data capture, combined with a telemetry link, has meant that precise position information is now available in the field in real-time. Position and attribute data captured in the field is often manually transported back to the office and loaded into mapping packages, civil engineering packages, or GIS databases for further processing.

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

    E-print Network

    Groppi, Christopher

    a required level of service in a bounded response time'' 2 #12; What makes a good RTOS? ffl A RTOS (Real tools 3 #12; Why are there so darn many? ( Classes of RTOS) ffl low­end (small) -- AMX -- C of RTOS) ffl Mid­range -- RT­Linux -- OS­9 -- QNX -- VRTX -- VxWorks -- RTEMS -- eCOS 5 #12; Why

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

    Microsoft Academic Search

    Hideyuki Tokuda; Makoto Kotera; Clifford E. Mercer

    1989-01-01

    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

  2. Subsystem real-time time dependent density functional theory.

    PubMed

    Krishtal, Alisa; Ceresoli, Davide; Pavanello, Michele

    2015-04-21

    We present the extension of Frozen Density Embedding (FDE) formulation of subsystem Density Functional Theory (DFT) to real-time Time Dependent Density Functional Theory (rt-TDDFT). FDE is a DFT-in-DFT embedding method that allows to partition a larger Kohn-Sham system into a set of smaller, coupled Kohn-Sham systems. Additional to the computational advantage, FDE provides physical insight into the properties of embedded systems and the coupling interactions between them. The extension to rt-TDDFT is done straightforwardly by evolving the Kohn-Sham subsystems in time simultaneously, while updating the embedding potential between the systems at every time step. Two main applications are presented: the explicit excitation energy transfer in real time between subsystems is demonstrated for the case of the Na4 cluster and the effect of the embedding on optical spectra of coupled chromophores. In particular, the importance of including the full dynamic response in the embedding potential is demonstrated. PMID:25903875

  3. Proximity effects correction in real time

    NASA Astrophysics Data System (ADS)

    Jedrasik, Piotr

    1999-06-01

    A method for the proximity effects correction in electron beam lithography for layouts with critical dimensions below 180 nm is proposed. A parallel processing system based on an artificial neural networks is suggested as a solution to the problem. The algorithm for the learning vector generation is based on a discrete iterative regularization. Several results of the correction process for different test layouts are presented. Error analysis of the error measure is presented. The difference between the target dose and the doses deposited in each exel after the correction process is smaller than 5 percent. As a hardware implementation of the real time proximity effects corrector the radial basis functions neural system is proposed. Simulations of the Gaussian synapse cell have been done. Results of our simulations assure that our neurocorrector can precompensate for one exel from the layout in less than 60 ns.

  4. Real-time, face recognition technology

    SciTech Connect

    Brady, S.

    1995-11-01

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

  5. A Measure of Real-Time Intelligence

    NASA Astrophysics Data System (ADS)

    Gavane, Vaibhav

    2013-03-01

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

  6. Filming protein fibrillogenesis in real time

    PubMed Central

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

    2014-01-01

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

  7. Near real-time stereo vision system

    NASA Technical Reports Server (NTRS)

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

    1993-01-01

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

  8. The RHIC real time data link system

    SciTech Connect

    Hartmann, H.

    1997-07-01

    The RHIC Real Time Data Link (RTDL) System distributes to all locations around the RHIC ring machine parameters of general interest to accelerator systems and users. The system, along with supporting host interface, is centrally located. The RTDL System is comprised of two module types: the Encoder Module (V105) and the Input Module (V106). There is only one V105 module, but many (up to 128) Input Modules. Multiple buffered outputs are provided for use locally or for retransmission to other RHIC equipment locations. Machine parameters are generated from the V115 Waveform Generator Module (WFG) or from machine hardware and coupled directly through a fiber optic serial link to one of the V106 input channels.

  9. In-line real time air monitor

    DOEpatents

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

    1998-07-14

    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.

  10. In-line real time air monitor

    DOEpatents

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

    1998-01-01

    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.

  11. Dynamic QOS Control based on Real-Time Threads

    Microsoft Academic Search

    Hideyuki Tokuda; Takuro Kitayama

    1993-01-01

    This paper presents dynamic QOS control schemes based on real-time threads. A real-time thread is based on an explicit declaration of timing attributes, such as start time, deadline, period, and its deadline handler. Two dynamic QOS control schemes: a self-stabilization scheme and a QOS manager-based scheme are evaluated using a QuickTime movie player running on Real-Time Mach.

  12. Integrating Multimedia Applications in Hard Real-Time Systems

    Microsoft Academic Search

    Luca Abeni; Giorgio C. Buttazzo

    1998-01-01

    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

  13. Challenges in Implementing the Real-Time Specification for Java (RTSJ) in a Commercial Real-Time Java Virtual Machine

    Microsoft Academic Search

    Michael H. Dawson

    2008-01-01

    The increasing complexity of modern real-time systems and the increasing need for real-time behavior in a broad range of applications such as network- centric warfare, telephony and stock trading has encouraged many developers to consider using Real-time Javatrade for systems previously only written in C, Ada or assembly language. The RTSJ standard defines the baseline requirements for a Real-time Java

  14. Public Science with Real-Time Experiments

    NASA Astrophysics Data System (ADS)

    Lenardic, A.

    2013-12-01

    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.

  15. WCET Free Time analysis of Hard Real-Time Systems on Multi-Processors: a Regular

    E-print Network

    Paris-Sud XI, Université de

    WCET Free Time analysis of Hard Real-Time Systems on Multi-Processors: a Regular Language validation of hard real-time systems. We consider systems that are composed of sequential hard real-time jobs such as multi-processors and speeds of processors. Key words: Finite automata, Real-Time Systems, Operational

  16. Verification of Real-Time Embedded Systems using Petri Net Models and Timed Automata

    E-print Network

    Zhao, Yuxiao

    Verification of Real-Time Embedded Systems using Petri Net Models and Timed Automata Luis Alejandro for real-time embedded systems. This paper presents an approach to formal verifi- cation of real-time their heterogeneity, embedded systems are characterized by dedicated function, real-time behavior, and high

  17. Experiments with Real-Time Servers in Real-Time Mach

    Microsoft Academic Search

    Tatsuo Nakajima; Takuro Kitayama; Hideyuki Tokuda

    1993-01-01

    The Mach micro kernel allows many operating system functions such as file systems, networkprotocols, TTY managers and process managers to be implemented as user level servers. Applicationprogrammers can write their own operating system servers suitable for their own applications. Mach,however, does not provide the mechanisms for building the servers which ensure predictable services.Therefore, if real-time applications which have rigid timing

  18. Real-time calculus for scheduling hard real-time systems

    Microsoft Academic Search

    Lothar Thiele; Samarjit Chakraborty; Martin Naedele

    2000-01-01

    This paper establishes a link between three areas, namely Max-Plus Linear System Theory as used for dealing with certain classes of discrete event systems, Network Calculus for establishing time bounds in communication networks, and real-time scheduling. In particular, it is shown that important results from scheduling theory can be easily derived and unified using Max-Plus Algebra. Based on the proposed

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

    NASA Astrophysics Data System (ADS)

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

    2011-06-01

    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.

  20. Real-time scheduling of software tasks

    SciTech Connect

    Hoff, L.T.

    1995-12-01

    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.

  1. Wheeler Ruml (UNH) Real-time Motion Planning 1 / 26 Real-time Motion Planning with Dynamic Obstacles

    E-print Network

    Ruml, Wheeler

    Execution Heuristic Search The Search Space Two Approaches The Literature Real-time R* RTA* for Robotics Execution Heuristic Search The Search Space Two Approaches The Literature Real-time R* RTA* for Robotics The Search Space Two Approaches The Literature Real-time R* RTA* for Robotics Evaluation Conclusion Wheeler

  2. Following Michael Faraday's Footprints

    NASA Astrophysics Data System (ADS)

    Galeano, Javier

    2011-01-01

    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.

  3. Modeling and analysis of real -time systems with mutex components

    Microsoft Academic Search

    Guoqiang Li; Xiaojuan Cai; Shoji Yuen

    2010-01-01

    Timed automata are popular for formally analyzing real-time systems. However, it is difficult to depict real-time systems with compositional components that interact with each other in a synchronization way or a mutex way. Synchronized components are modeled using parallel composition of timed automata by Larsen et al. This paper proposes controller automata to represent real-time systems with mutex components. In

  4. Faithful Virtualization on a Real-Time Operating System

    Microsoft Academic Search

    Henning Schild; Adam Lackorzynski; Alexander Warg

    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

  5. An Optimal Control Approach To Real-Time Vehicle Guidance

    E-print Network

    Stryk, Oskar von

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

  6. Implementing Reliable Distributed Real-Time Systems with the -Model

    E-print Network

    Implementing Reliable Distributed Real-Time Systems with the -Model Jean-Fran¸cois Hermant for distributed real-time systems should be based on synchronous computational models. Safety in such designs demonstrate how this algorithm can be transferred from the abstract model into a real network/system archi

  7. Real-time Motion Region Detection and Contouring System

    Microsoft Academic Search

    E. Aksoy; N. Adar; S. Canbek; E. Seke; U. Gurel

    2007-01-01

    Many real world applications require real-time motion detection. Performance of a motion detection system should be fast enough so that moving objects in video can be detected and processed in real time. Once motion region in a video is detected, object tracking, image data mining, semantic meaning extraction, and other video\\/image processing techniques can be performed. There is a lot

  8. Real-Time Operating Systems: Issues and Implementations

    Microsoft Academic Search

    Ryan Puga Nakamoto

    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.

  9. Real-Time Principal-Component Analysis

    NASA Technical Reports Server (NTRS)

    Duong, Vu; Duong, Tuan

    2005-01-01

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

  10. 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.

  11. Real-time information management environment (RIME)

    NASA Astrophysics Data System (ADS)

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

    2000-08-01

    Whereas data mining and exploitation improve the quality and quantity of information available to the user, there remains a mission requirement to assist the end-user in managing the access to this information and ensuring that the appropriate information is delivered to the right user in time to make decisions and take action. This paper discusses TASC's federated architecture to next- generation information management, contrasts the approach against emerging technologies, and quantifies the performance gains. This architecture and implementation, known as Real-time Information Management Environment (RIME), is based on two key concepts: information utility and content-based channelization. The introduction of utility allows users to express the importance and delivery requirements of their information needs in the context of their mission. Rather than competing for resources on a first-come/first-served basis, the infrastructure employs these utility functions to dynamically react to unanticipated loading by optimizing the delivered information utility. Furthermore, commander's resource policies shape these functions to ensure that resources are allocated according to military doctrine. Using information about the desired content, channelization identifies opportunities to aggregate users onto shared channels reducing redundant transmissions. Hence, channelization increases the information throughput of the system and balances sender/receiver processing load.

  12. Real-time optoacoustic monitoring of stroke

    NASA Astrophysics Data System (ADS)

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

    2014-03-01

    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.

  13. Real-Time Dosimetry for Radiobiology Experiments Using 25 MeV LINAC

    SciTech Connect

    Mestari, Mohammed A.; Naeem, Syed F. [Department of Physics, Idaho State University, 921 S. 8th St., MS 8106, Pocatello, ID 83209 (United States); Wells, Douglas P.; Hunt, Alan [Idaho Accelerator Center, Idaho State University, 921 S. 8th St., MS 8263, Pocatello, ID 83209 (United States); Department of Physics, Idaho State University, 921 S. 8th St., MS 8106, Pocatello, ID 83209 (United States); DeVeaux, Linda C. [Idaho Accelerator Center, Idaho State University, 921 S. 8th St., MS 8263, Pocatello, ID 83209 (United States); Department of Biological Sciences, Idaho State University, 921 S. 8th St., MS 8007, Pocatello, ID 83209 (United States)

    2009-03-10

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

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

    E-print Network

    Paris-Sud XI, Université de

    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

  15. CRANS - CONFIGURABLE REAL-TIME ANALYSIS SYSTEM

    NASA Technical Reports Server (NTRS)

    Mccluney, K.

    1994-01-01

    In a real-time environment, the results of changes or failures in a complex, interconnected system need evaluation quickly. Tabulations showing the effects of changes and/or failures of a given item in the system are generally only useful for a single input, and only with regard to that item. Subsequent changes become harder to evaluate as combinations of failures produce a cascade effect. When confronted by multiple indicated failures in the system, it becomes necessary to determine a single cause. In this case, failure tables are not very helpful. CRANS, the Configurable Real-time ANalysis System, can interpret a logic tree, constructed by the user, describing a complex system and determine the effects of changes and failures in it. Items in the tree are related to each other by Boolean operators. The user is then able to change the state of these items (ON/OFF FAILED/UNFAILED). The program then evaluates the logic tree based on these changes and determines any resultant changes to other items in the tree. CRANS can also search for a common cause for multiple item failures, and allow the user to explore the logic tree from within the program. A "help" mode and a reference check provide the user with a means of exploring an item's underlying logic from within the program. A commonality check determines single point failures for an item or group of items. Output is in the form of a user-defined matrix or matrices of colored boxes, each box representing an item or set of items from the logic tree. Input is via mouse selection of the matrix boxes, using the mouse buttons to toggle the state of the item. CRANS is written in C-language and requires the MIT X Window System, Version 11 Revision 4 or Revision 5. It requires 78K of RAM for execution and a three button mouse. It has been successfully implemented on Sun4 workstations running SunOS, HP9000 workstations running HP-UX, and DECstations running ULTRIX. No executable is provided on the distribution medium; however, a sample makefile is included. Sample input files are also included. The standard distribution medium is a .25 inch streaming magnetic tape cartridge (Sun QIC-24) in UNIX tar format. Alternate distribution media and formats are available upon request. This program was developed in 1992.

  16. Fast Faraday Cup With High Bandwidth

    SciTech Connect

    Deibele, Craig E [Knoxville, TN

    2006-03-14

    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.

  17. WCET analysis of probabilistic hard real-time systems

    Microsoft Academic Search

    Guillem Bernat; Antoine Colin; Stefan M. Petters

    2002-01-01

    Traditional approaches for worst case execution time (WCET) analysis produce values which are very pessimistic if applied to modern processors. In addition, end to end measurements as used in industry produce estimates of the execution time that potentially underestimate the real worst case execution time. We introduce the notion of probabilistic hard real-time systems which have to meet all the

  18. Computing Accumulated Delays in Real-time Systems

    Microsoft Academic Search

    Rajeev Alur; Costas Courcoubetis; Thomas A. Henzinger

    1993-01-01

    . We present a verification algorithm for duration properties of real-timesystems. While simple real-time properties constrain the total elapsed time betweenevents, duration properties constrain the accumulated satisfaction time of state predicates.We formalize the concept of durations by introducing duration measures fortimed automata. A duration measure assigns to each finite run of a timed automatona real number ---the duration of the

  19. A Software Fault Injection Tool on Real-Time Mach

    Microsoft Academic Search

    Scott Dawson; Farnam Jahanian; Todd Mitton

    1995-01-01

    Ensuring that a distributed real-time system with strict dependability constraints meets its prescribed specification is a growing challenge that confronts software developers and system engineers. This paper reports on a software fault injection tool, called SockPFI, for testing the fault tolerance and timing behavior of distributed real-time applications. SockPFI, developed on Real-Time Mach, can be used to test socket-based distributed

  20. Modeling and Validation of the Real-Time Mach Scheduler

    Microsoft Academic Search

    Hiroshi Arakawa; Daniel I. Katcher; Jay K. Strosnider; Hideyuki Tokuda

    1993-01-01

    Real-time scheduling theory is designed to provide verification that all real-time tasks meet their timing requirements. However, this body of theory generally assumes that resources are instantaneously pre-emptable and ignores the costs of systems services. In previous work [1, 2] we provided a theoretical foundation for including the costs of the operating system scheduler in the real-time scheduling framework. In

  1. Modeling and validation of the real-time Mach scheduler

    Microsoft Academic Search

    Hiroshi Arakawa; Daniel I. Katcher; Jay K. Strosnider; Hideyuki Tokuda

    1993-01-01

    Real-time scheduling theory is designed to provide a priori verification that all real-time tasks meet their timing requirements. However, this body of theory generally assumes that resources are instantaneously pre-emptable and ignores the costs of systems services. In previous work [1, 2] we provided a theoretical foundation for including the costs of the operating system scheduler in the real-time scheduling

  2. PERTS: A Prototyping Environment for Real-Time Systems

    NASA Technical Reports Server (NTRS)

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

    1993-01-01

    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.

  3. Modechart: A Specification Language for Real-Time Systems

    Microsoft Academic Search

    Farnam Jahanian; Aloysius K. Mok

    1994-01-01

    Present a specification language for real-time systems called Modechart. The semantics of Modechart is given in terms of real-time logic (RTL), which is especially amenable to reasoning about the absolute (real-time clock) timing of events. The semantics of Modechart has an important property that the translation of a Modechart specification into RTL formulas results in a hierarchical organization of the

  4. PERTS: A prototyping environment for real-time systems

    Microsoft Academic Search

    Jane W. S. Liu; Juan-Luis Redondo; Zhong Deng; Riccardo Bettati; Ami Silberman; Matthew Storch; Rhan Ha; Wei-Kuan Shih

    1993-01-01

    PERTS is a prototyping environment for real-time systems. It contains schedulers and resource access protocols for time-critical applications, together with a comprehensive set of tools for the analysis, validation, and evaluation of real-time systems built on the scheduling paradigms supported by these building blocks. This paper describes the underlying models of real-time systems supported by PERTS, as well as its

  5. Verification of Real-Time Systems Using PVS

    Microsoft Academic Search

    Natarajan Shankar

    1993-01-01

    We present an approach to the verification of the real-time behaviorof concurrent programs and describe its mechanization using thePVS proof checker. Our approach to real-time behavior extends previousverification techniques for concurrent programs by proposing asimple model for real-time computation and introducing a new operatorfor reasoning about absolute time. This model is formalizedand mechanized within the higher-order logic of PVS. The

  6. Java Framework for Distributed Real-Time Embedded Systems

    Microsoft Academic Search

    Elias Teodoro Silva Jr.; Edison Pignaton Freitas; Flávio Rech Wagner; Fabiano Costa Carvalho; Carlos Eduardo Pereira

    2006-01-01

    This paper presents the evaluation of a multithread distributed real-time object-oriented platform. A communication API was developed to increase functionalities of an API that implements the real-time specification for Java standard, extending it to cover embedded distributed applications. Real-time restrictions of the communication are ensured by a time-out mechanism. The API can be adapted to be used with different underlying

  7. Dataflow Analysis for Real-Time Embedded Multiprocessor System Design

    Microsoft Academic Search

    Marco Bekooij; Rob Hoes; Orlando Moreira; Peter Poplavko; Milan Pastrnak; Bart Mesman; Jan David Mol; Sander Stuijk; Valentin Gheorghita; Jef van Meerbergen

    2005-01-01

    Dataflow analysis techniques are key to reduce the number of design iterations and shorten the design time of real-time embedded network based multiprocessor systems that process data streams. With these analysis techniques the worst-case end-to-end temporal behavior of hard real-time applications can be derived from a dataflow model in which computation, communication and arbitration is modeled. For soft real-time applications

  8. High sensitivity real-time NVR monitor

    NASA Technical Reports Server (NTRS)

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

    1997-01-01

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

  9. Real-Time Accumulative Computation Motion Detectors

    PubMed Central

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

    2009-01-01

    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

  10. Active acoustic metamaterials reconfigurable in real time

    NASA Astrophysics Data System (ADS)

    Popa, Bogdan-Ioan; Shinde, Durvesh; Konneker, Adam; Cummer, Steven A.

    2015-06-01

    A major limitation of current acoustic metamaterials is that their acoustic properties are either locked into place once fabricated or are only modestly tunable, tying them to the particular application for which they are designed. We present a design approach that yields active metamaterials whose physical structure is fixed, yet their local acoustic response can be changed almost arbitrarily and in real time by configuring the digital electronics that control the metamaterial acoustic properties. We demonstrate this approach experimentally by designing a metamaterial slab configured to act as a very thin acoustic lens that manipulates differently three identical, consecutive pulses incident on the lens. Moreover, we show that the slab can be configured to simultaneously implement various roles, such as that of a lens and a beam steering device. Finally, we show that the metamaterial slab is suitable for efficient second harmonic acoustic imaging devices capable of overcoming the diffraction limit of linear lenses. These advantages demonstrate the versatility of this active metamaterial and highlight its broad applicability, in particular, to acoustic imaging.

  11. Real time visual servoing using controlled illumination

    NASA Astrophysics Data System (ADS)

    Urban, J. P.; Motyl, G.; Gallice, J.

    1994-02-01

    A real-time visual servoing approach is applied to robotics tasks consisting of the positioning of the end effector with respect to a priori known polyhedral objects. The vision apparatus is consituted by a compact CCD camera rigidly coupled with two laser stripes mounted on the wrist of a robot manipulator. The objective is to servo the robot and effector at a constant position and orientation with respect to a known object in three- dimensional space in the field of view of the sensory system. The approach is expressed in terms of sensor-based control applied to visual servoing. In the case of camera-light stripe coupling, the elementary visual signals used for visual servoing are the points of discontinuity in the light stripes. The feasibility of the approach is demonstrated in a factory automation task consisting of the positioning of the end-effector tool over a vehicle battery. Both simulation and experimentation results are presented, proving the robustness and stability of the algorithm.

  12. Real-time virtual Doppler ultrasound

    NASA Astrophysics Data System (ADS)

    Khoshniat, Mahdieh; Thorne, Meghan L.; Poepping, Tamie L.; Holdsworth, David W.; Steinman, David A.

    2004-04-01

    Doppler ultrasound (DUS) is widely used to diagnose and plan treatments for vascular diseases, but the relationship between complex blood flow dynamics and the observed DUS signal is not completely understood. In this paper, we demonstrate that Doppler ultrasound can be realistically simulated in a real-time manner via the coupling of a known, previously computed velocity field with a simple model of the ultrasound physics. In the present case a 3D computational fluid dynamics (CFD) model of physiologically pulsatile flow a stenosed carotid bifurcation was interrogated using a sample volume of known geometry and power distribution. Velocity vectors at points within the sample volume were interpolated using a fast geometric search algorithm and, using the specified US probe characteristics and orientation, converted into Doppler shifts for subsequent display as a Doppler spectrogram or color DUS image. The important effect of the intrinsic spectral broadening was simulated by convolving the velocity at each point within the sample volume by a triangle function whose width was proportional to velocity. A spherical sample volume with a Gaussian power distribution was found to be adequate for producing realistic Doppler spectrogram in regions of uniform, jet, and recirculation flow. Fewer than 1000 points seeded uniformly within a radius comprising more than 99% of the total power were required, allowing spectra to be generated from high resolution CFD data at 100Hz frame rates on an inexpensive desktop workstation.

  13. Evaluation of Concurrency Control Strategies for Mixed Soft Real-Time Database Systems

    E-print Network

    Cheng, Reynold Cheng Chun

    1 Evaluation of Concurrency Control Strategies for Mixed Soft Real-Time Database Systems Kam soft real-time database systems (MSRTDBS), in which both non-real-time and soft real-time transactions of both soft real-time and non-real-time transactions under different real-time supports in the system

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

    E-print Network

    Bertini, Robert L.

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

  15. Real-time Recognition of Continuous-time Biomedical Signals Using the Diffusion Network

    E-print Network

    Huang, Haimei

    Real-time Recognition of Continuous-time Biomedical Signals Using the Diffusion Network Yu-Su Hsu, Tang-Jung Chiu, and Hsin Chen Abstract-- Real-time recognition of multichannel, continuous- time, to recognise continuous-time biomedical signals. In addition, a hardware-friendly approach for achieving real-time

  16. Time Properties Dedicated Semantics for UML-MARTE Safety Critical Real-Time System Verification

    E-print Network

    Paris-Sud XI, Université de

    Time Properties Dedicated Semantics for UML-MARTE Safety Critical Real-Time System Verification. Critical real-time embedded systems (RTES) crucially have strong requirement concerning system Transformation, UML, MARTE, Real-Time Em- bedded System, Time Petri Net, Time Property, Synchronization 1

  17. Following Michael Faraday's Footprints

    ERIC Educational Resources Information Center

    Galeano, Javier

    2011-01-01

    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…

  18. Apparatus Characterizes Transient Voltages in Real Time

    NASA Technical Reports Server (NTRS)

    Medelius, Pedro

    2005-01-01

    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.

  19. PERTS: A Prototyping Environment for Real-Time Systems

    NASA Technical Reports Server (NTRS)

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

    1991-01-01

    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.

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

    Microsoft Academic Search

    Celina Gibbs; Yvonne Coady; Jan Vitek; Tian Zhao; James Noble; Chris Andreae

    Increasing demands for real-time systems are vastly outstripping the ability for developers to robustly design, implement, compose, integrate, validate, and enforce real-time constraints. It is essential that the production of real-time systems take advantage of approaches that enable higher software productivity. Though many accidental complexities have proven to be time consuming and problematic - type errors, memory management, and steep

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

    Microsoft Academic Search

    Yu-chung Wang; Kwei-jay Lin

    1999-01-01

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

  2. Real-Time Modeling of Natural Resources Using the Spatial Sciences

    E-print Network

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

  3. Extreme events in Faraday waves

    NASA Astrophysics Data System (ADS)

    Punzmann, Horst; Shats, Michael; Xia, Hua

    2014-05-01

    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)

  4. Predictability and Consistency in RealTime Database Systems

    E-print Network

    Son, Sang H.

    , such as aerospace and weapon systems, computer­integrated manufacturing, robotics, nuclear power 509 #12; 510; thus they need to have databases which can provide the services needed by real­time computations. Real constraints and may be expressed as ei­ ther the periods or the deadlines. Therefore, the correctness of real

  5. Real time density functional simulations of quantum scale conductance

    E-print Network

    Evans, Jeremy Scott

    2009-01-01

    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 ...

  6. Towards a Real-Time Cluster Computing Infrastructure

    Microsoft Academic Search

    Peter SY Hui; Satish Chikkagoudar; Mark R. Johnston

    2011-01-01

    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

  7. Some novel methods in real-time holographic interferometry

    Microsoft Academic Search

    Bingheng Xiong; Zhengrong Wang; Junchang Li; Liyun Zhong; Xiaoxu Lu

    2002-01-01

    Six novel methods in real-time holographic interferometry recently worked out by the authors of this paper. They are: the one for recording a real-time hologram with high contrast interference fringes and high brightness of the testing optics field, the one for measuring the phase modulation of a thin-phase hologram, the one for controlling the phase modulation in making a real-time

  8. Development of a real-time simulation environment

    Microsoft Academic Search

    P. M. Korkealaakso; A. J. Rouvinen; S. M. Moisio; J. K. Peusaari

    2007-01-01

    A systematic approach to real-time simulation of multibody systems requires a versatile real-time simulation environment.\\u000a Such an environment includes, besides the numerical solver core of the mechanism dynamics, a graphics engine, and, in many\\u000a cases, a physical visualization environment. The use of real-time simulation in human-in-the-loop-simulation (HIL) sets requirements\\u000a for the flexible connection of the operator to the dynamics model.

  9. RTP: A Transport Protocol for Real-Time Applications

    Microsoft Academic Search

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

    2001-01-01

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

  10. Scheduling Real-time Transactions: a Performance Evaluation

    Microsoft Academic Search

    Robert K. Abbott; Hector Garcia-molina

    1988-01-01

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

  11. Real-Time Tsunami Forecasting: Challenges and Solutions

    Microsoft Academic Search

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

    2005-01-01

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

  12. Distributed motion control using real-time network communication techniques

    Microsoft Academic Search

    Shiu-Yung Lin; Chan-You Ho; Ying-Yu Tzou

    2000-01-01

    This paper presents a survey of the applications of real-time network control technology to advanced digital motion control system. Applications of PROFIBUS, FIP, CAN bus, Interbus-S, SERCOS, and Ethernet to coordinated motion control have been studied. Realization issues in application of real-time network control for motor drives and coordinated motion control systems are discussed. Future development trend of real-time network

  13. A Switch Design for Real-Time Industrial Networks

    Microsoft Academic Search

    Qixin Wang; Sathish Gopalakrishnan; Xue Liu; Lui Sha

    2008-01-01

    The convergence of computers and the physical world is the theme for next generation networking research. This trend calls for real-time network infrastructure, which re- quires a high-speed real-time WAN to serve as its back- bone. However, commercially available high-speed WAN switches (routers) are designed for best-effort Internet traf- fic. A real-time switch design for the aforementioned net- works is

  14. Adaptive Real-time Query Scheduling over Data Streams

    Microsoft Academic Search

    Xin Li; Hong-an Wang

    2007-01-01

    Adaptive query scheduling is a challenging issue in data stream management systems, especially for real-time applications. Existing strategies are poor at providing deadline guarantees for continuous queries. To address this problem, a hybrid real-time query model is introduced to characterize periodic and aperiodic queries over data streams. Moreover, an adaptive real-time scheduling strategy, termed FC-TBS, is proposed to schedule the

  15. Buffer Management in a Real-Time Shared Disks Cluster

    Microsoft Academic Search

    Sanghun Yun; Haengrae Cho

    2008-01-01

    A great deal of research indicates that the shared disks (SD) cluster is suitable to high performance transaction processing.\\u000a However, the aggregation of SD cluster with real-time processing has not been investigated. By adopting cluster technology,\\u000a the real-time services will be highly available and can exploit internode parallelism. In this paper, we consider buffer management\\u000a issues in a real-time SD

  16. Applying Hard Real-Time Technology to Multimedia Systems

    Microsoft Academic Search

    Clifford W. Mercer; Ragunathan Rajkumar; Hideyuki Tokuda

    1993-01-01

    The real-time community tends to contend that multimedia systems are indeed real-time systems, while the multimedia community points to problems such as video databases on disks and dynamic environments as issues unique to multimedia systems. Also, historically, real-time and multimedia systems have had different roots, and therefore embody different schools of thought. In this paper, we consider the similarities and

  17. ClockWork: a Real-Time Feasibility Analysis Tool

    Microsoft Academic Search

    Pierre G. Jansen; Ferdy Hanssen; Sape Mullender

    2002-01-01

    ClockWork shows that we can improve the flexibility and efficiency of real-time kernels. We do this by proposing methods for scheduling based on so-called Real-Time Transactions. ClockWork uses Real-Time Transactions which allow scheduling decisions to be taken by the system. A programmer does not need to be aware of synchronisation due to the sharing of resources and may have the

  18. Measuring OS support for real-time CORBA ORBs

    Microsoft Academic Search

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

    1999-01-01

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

  19. Linux real-time framework for fusion devices

    Microsoft Academic Search

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

    2009-01-01

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

  20. An Overview of Real-Time Database Systems

    Microsoft Academic Search

    Ben Kao; Hector Garcia-molina

    1994-01-01

    IntroductionTraditionally, real-time systems manage their data (e.g., chamber temperature, aircraftlocations) in application-dependent structures. As real-time systems evolve,their applications become more complex and require access to more data. It thusbecomes necessary to manage the data in a systematic and organized fashion.Database management systems provide tools for such organization, so in recentyears there has been interest in "merging" database and real-time technology.

  1. Performance Specifications and Metrics for Adaptive Real-Time Systems

    Microsoft Academic Search

    Chenyang Lu; John A. Stankovic; Tarek F. Abdelzaher; Gang Tao; Sang Hyuk Son; Michael Marley

    2000-01-01

    While early research on real-time computing was concerned with guaranteeing avoidance of undesirabl e effects such as overload and deadline misses, adapt ive real-time systems are designed to handle such effec ts dynamically. Various research efforts have addresse d the characterization and improvement of the dynamic behavior of real-time systems. However, to the auth ors' knowledge, no unified framework exists

  2. Severe storms measurement system real time data processing and displays

    NASA Technical Reports Server (NTRS)

    Jeffreys, H. B.

    1980-01-01

    The objectives of the system are to provide the system operator with real time system performance check and to provide data recording of all SSMS data. Meteorologists are provided with real time indication of meteorological data measurements including aid for directing flight profiles in real time and aid for directing SSMS operations. A day-to-day feedback is provided to meteorologists, system operators, and flight crews for flight planning on subsequent flight tests days.

  3. Prototyping the R-Shell Real-Time Environment 

    E-print Network

    Oswal, Snehal M.

    1993-01-01

    agents for these applications, and an object-oriented operating system that provides basic support for guaranteeing deadline- based real-time constraints, scheduling across a spectrum of resources, and fault-tolerance and distribution. To my parents.... This can be provided for by hierarchical or selectable resource schedulers to make allocation decisions for different requirements. We present here a prototype of the R-Shell Real-Time Environ- ment. It consists of real-time applications, scheduling...

  4. Dynamic memory management for real-time embedded Java chips

    Microsoft Academic Search

    Chi-min Lin; Tien-fu Chen

    2000-01-01

    Java chips have been widely accepted in real-time embedded systems. Those embedded applications usually impose resource and real-time constraints on the design of the CPU. In this paper, we seek a hardware-assisted scheme to support runtime memory management and thus to provide a real-time capability for embedded Java devices. We propose a dynamic garbage collection mechanism to guarantee a predictable

  5. Real-time operating system for advanced avionics architecture

    Microsoft Academic Search

    S. L. Benning; R. S. Evans

    1988-01-01

    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.

  6. HARTOS: a distributed real-time operating system

    Microsoft Academic Search

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

    1989-01-01

    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

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

    Microsoft Academic Search

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

    2001-01-01

    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

  8. Fairness in Periodic Real-Time Scheduling

    Microsoft Academic Search

    Sanjoy K. Baruah

    1995-01-01

    The issue of temporal fairness in periodic real-timescheduling is considered. It is argued that such fairnessis often a desirable characteristic in real-timeschedules. A concrete criterion for temporal fairness--- pfairness --- is described. The weight-monotonicscheduling algorithm, a static priority scheduling algorithmfor generating pfair schedules, is presented andproven correct. A feasibility test is presented which,if satisfied by a system of periodic tasks,

  9. Real-Time Feature Tracking Using Homography

    NASA Technical Reports Server (NTRS)

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

    2010-01-01

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

  10. Real Time Digital Processing of GPS Measurements for Transmission Engineering

    E-print Network

    1 Real Time Digital Processing of GPS Measurements for Transmission Engineering C. Mensah-Bonsu G, and potentially in deriving real time data on transmission lines that will allow them to be loaded to a dynamic: The Global Positioning System (GPS) is a state of the art timing and positioning system based on 24 or more

  11. Real-Time Reconfiguration of MPLS/WDM Networks

    E-print Network

    Gruner, Daniel S.

    Real-Time Reconfiguration of MPLS/WDM Networks Mark Shayman LTS/UMIACS Review February 15, 2005 switched paths in real-time to accommodate changes in traffic demands ­ Adapts proactively to both deterministic (time-of-day) and random traffic variations ­ Minimizes disruption to existing traffic due

  12. Completeness of Real-Time Maude Analysis (Extended Version)

    E-print Network

    Ã?lveczky, Peter Csaba

    Completeness of Real-Time Maude Analysis (Extended Version) Peter Csaba ¨Olveczky a , Jos of Illinois at Urbana-Champaign Abstract This paper presents criteria that guarantee completeness of Real-Time Maude search and temporal logic model checking analyses, under the maximal time sampling strat- egy

  13. The RealTime Transport Protocol Henning Schulzrinne

    E-print Network

    Schulzrinne, Henning

    : fixed point, NTP­format, wallclock time 7 #12; RTP options RTP, RTCP options share : : : ffl same formatRTP The Real­Time Transport Protocol Henning Schulzrinne AT&T Bell Laboratories (Murray Hill) MCNC 2nd Packet Video Workshop December 1992 1 #12; Overview RTP = Transport services for real­time

  14. Switch real-time industrial Ethernet with mixed scheduling policy

    Microsoft Academic Search

    Jiming Chen; Zhi Wang; Youxian Sun

    2002-01-01

    There is a strong interest of using the cheap and simple Ethernet technology for industrial network control system. However, the lack of real-time services has prevented this change of used network technology. In order to realize real-time communication over Ethernet in industrial application, one must be able to bound the medium access time within an acceptable limit. But the multiple

  15. Data Access Scheduling in Firm Real-Time Database Systems

    Microsoft Academic Search

    Jayant R. Haritsa; Michael J. Carey; Miron Livny

    1992-01-01

    A major challenge addressed by conventional database systems has been to efficiently implement the transaction model, which provides the properties of atomicity, serializability, and permanence. Real-time applica- tions have added a complex new dimension to this challenge by placing deadlines on the response time of the database system. In this paper, we examine the problem of real-time data access scheduling,

  16. Collaborative Scheduling and Synchronization of Distributable Real-Time Threads

    E-print Network

    Ravindran, Binoy

    Collaborative Scheduling and Synchronization of Distributable Real-Time Threads Sherif F. Fahmy Memory, Time/Utility Functions, Utility Accrual Scheduling Copyright 2008, Sherif F. Fahmy #12;Collaborative Scheduling and Synchronization of Distributable Real-Time Threads Sherif F. Fahmy (ABSTRACT

  17. Real-Time UML State Machines: An Analysis Approach

    Microsoft Academic Search

    J. Trowitzsch; A. Zimmermann

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

  18. Real-time communication in FDDI-based networks 

    E-print Network

    Kumar, Amit Virendra

    1995-01-01

    The Fiber Distributed Data Interface (FDDI) is recommended as a candidate for many hard real-time local-area communication systems. The Timed-Token Medium Access Control (MAC) Protocol of FDDI is capable of guaranteeing real-time traffic on an FDDI...

  19. Real-Time MENTAT programming language and architecture

    NASA Technical Reports Server (NTRS)

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

    1989-01-01

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

  20. Formal Analysis of Time-Dependent Cryptographic Protocols in Real-Time Maude

    E-print Network

    Ã?lveczky, Peter Csaba

    checking, and time-bounded and un- bounded explicit-state search for reachability analysis. Real-Time MaudeFormal Analysis of Time-Dependent Cryptographic Protocols in Real-Time Maude Peter Csaba ¨Olveczky}@ifi.uio.no Abstract This paper investigates the suitability of applying the general-purpose Real-Time Maude tool

  1. RealTime Filesystems Guaranteeing Timing Constraints for Disk Accesses in RTMach

    E-print Network

    Rajkumar, Ragunathan "Raj"

    Real­Time Filesystems Guaranteeing Timing Constraints for Disk Accesses in RT­Mach Anastasio Molano, we design and implement a real­time filesystem on the RT­Mach microkernel­based system running a real­time extend the processor reservation model in RT­Mach to include guaranteed and timely access to disk

  2. Verification of Real-Time Specification Patterns on Time Transitions Systems

    E-print Network

    Verification of Real-Time Specification Patterns on Time Transitions Systems Nouha Abid1 A distinctive feature of real-time systems is to be subject to severe time con- straints that arise from critical interactions between the system and its environ- ment. Since reasoning about real-time systems

  3. On Self-Timed Circuits in Real-Time Systems Markus Ferringer

    E-print Network

    On Self-Timed Circuits in Real-Time Systems Markus Ferringer Department of Computer Engineering regarding their usage in real-time systems, especially the Time-Triggered Protocol. We propose a simple? In our research project ARTS1 (Asynchronous Logic in Real-Time Systems) we are aiming to find answers

  4. Approximate Response Time Analysis for Thermal-Aware Real-Time Systems Under

    E-print Network

    Paris-Sud XI, Université de

    Approximate Response Time Analysis for Thermal-Aware Real-Time Systems Under Fixed of real-time systems is to guarantee predictable timing behavior for controlled devices. Therefore, memory caches, etc). However, for a new generation of real-time systems applications, e.g. medical

  5. Avoiding Timing Problems in Real-Time Software Peter Puschner and Raimund Kirner

    E-print Network

    operation of the entire real-time system can be guaranteed. In this paper we explain how the correct timing predictable and easy to analyze for its worst-case execution time. 1 Introduction Real-time computer systems of a sin- gle processing node of a real-time system can be estab- lished. In our argumentation we follow

  6. A real-time simulation facility for astronomical adaptive optics

    NASA Astrophysics Data System (ADS)

    Basden, Alastair

    2014-04-01

    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.

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

    Microsoft Academic Search

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

    2001-01-01

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

  8. Real-time Avatar Animation from a Single Image

    PubMed Central

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

    2014-01-01

    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

  9. A real-time photogrammetry system based on embedded architecture

    NASA Astrophysics Data System (ADS)

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

    2014-06-01

    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.

  10. Modified Faraday cup

    SciTech Connect

    Elmer, John W. (Pleasanton, CA); Teruya, Alan T. (Livermore, CA); O'Brien, Dennis W. (Livermore, CA)

    1996-01-01

    A tomographic technique for measuring the current density distribution in electron beams using electron beam profile data acquired from a modified Faraday cup to create an image of the current density in high and low power beams. The modified Faraday cup includes a narrow slit and is rotated by a stepper motor and can be moved in the x, y and z directions. The beam is swept across the slit perpendicular thereto and controlled by deflection coils, and the slit rotated such that waveforms are taken every few degrees form 0.degree. to 360.degree. and the waveforms are recorded by a digitizing storage oscilloscope. Two-din-tensional and three-dimensional images of the current density distribution in the beam can be reconstructed by computer tomography from this information, providing quantitative information about the beam focus and alignment.

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

    Microsoft Academic Search

    Anastasio Molano; Kanaka Juvva; Ragunathan Rajkumar

    1997-01-01

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

  12. Modeling Decentralized Real-Time Control by State Space Partition of Timed Thanikesavan Sivanthi, Srivas Chennu

    E-print Network

    Kent, University of

    in the process of modeling large-scale distributed real-time systems. The rest of the paper is organizedModeling Decentralized Real-Time Control by State Space Partition of Timed Automata Thanikesavan to translate the state space visualization of a centralized real-time control system to a decentralized one

  13. Verification of Real-Time Specification Patterns on Time Transition Systems

    E-print Network

    Paris-Sud XI, Université de

    Verification of Real-Time Specification Patterns on Time Transition Systems Nouha Abid1,2 , Silvano be compiled into TTS. 1 Introduction A distinctive feature of real-time systems is to be subject to severe. Since reasoning about real-time systems is difficult, it is important to be able to apply formal

  14. Time-Predictable Task Preemption for Real-Time Systems with Direct-Mapped Instruction Cache

    E-print Network

    by an instruction counter. 1 Introduction The number of embedded systems where the correct real-time behaviorTime-Predictable Task Preemption for Real-Time Systems with Direct-Mapped Instruction Cache of this unsatisfactory situation we started to think about simpler execution models for real-time systems. In recent work

  15. Real-Time Scheduling of Energy Harvesting Embedded Systems with Timed Automata

    E-print Network

    Paris-Sud XI, Université de

    Real-Time Scheduling of Energy Harvesting Embedded Systems with Timed Automata Yasmina Abdedda feasibility and schedu- lability tests for a real-time scheduling problem under energy constraints. We first the model checking tool UPPAAL [1]. Index Terms--power aware real time scheduling ; energy harvesting

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

    E-print Network

    Paris-Sud XI, Université de

    A Hardware Time Manager Implementation for the Xenomai Real-Time Kernel of Embedded Linux Pierre Purpose and Application-based Systems]: Real-time and Embedded Systems; B.6.1 [Logic Design]: Design Style Real-Time Operating Systems, Embedded Linux, Reconfig- urable Architectures, FPGA, Embedded Systems

  17. Symbolic Model Checking for Real-time Systems

    Microsoft Academic Search

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

    1992-01-01

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

  18. Tractable Real-time Air Traffic Control Automation

    Microsoft Academic Search

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

    2002-01-01

    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.

  19. Real-Time OS Needs Multi-Resource Coordination

    Microsoft Academic Search

    Kartik Gopalan; Tzi-cker Chiueh

    Most research on real-time operating systems have focused on scheduling and admission control of a single system resource, such as CPU, disk, and network link. However, real-world real-time applications require access to multiple system re- sources. Coordinating the allocation and scheduling of mul- tiple resources raises new and interesting research problems, especially for latency-bound applications. The goal of this po-

  20. Estimating correlation for a real-time measure of connectivity.

    PubMed

    Arunkumar, Akhil; Panday, Ashish; Joshi, Bharat; Ravindran, Arun; Zaveri, Hitten P

    2012-01-01

    There has recently been considerable interest in connectivity analysis of fMRI and scalp and intracranial EEG time-series. The computational requirements of the pair-wise correlation (PWC), the core time-series measure used to estimate connectivity, presents a challenge to the real-time estimation of the PWC between all pairs of multiple time-series. We describe a parallel algorithm for computing PWC in real-time for streaming data from multiple channels. The algorithm was implemented on the Intel Xeon™ and IBM Cell Broadband Engine™ platforms. We evaluated time to estimate correlation for signals recorded with different acquisition parameters as a comparison to real-time constraints. We demonstrate that the execution time of these efficient implementations meet real-time constraints in most instances. PMID:23367098