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IEEE International Symposim on High Assurance systems engineering

作者： R. Paul M.F. Khan S. Baqai A. Ghafoor Testing and Evaluation Washington D.C. DC USA School of Electrical & Computer Engineering Distributed Multimedia Systems Laboratory Purdue University West Lafayette IN USA

The use of multimedia technology can provide cost effective methods for management and dissemination of information, and thus increase economic efficiency. Distributed, networked multimedia information systems will be a critical component of technology-based information infrastructures in the future. Several ground breaking applications have already appeared, and more are expected to follow. Innovations in hardware and software are feeding this revolution. In this paper, the notion of quality for multimedia data transferred over the networks is developed. Multimedia data synchronization requirements are specified to ensure high quality delivery of multimedia information. Accordingly we propose synchronization techniques in a client server environment.

关键词： Multimedia systems Streaming media Application software Multimedia databases Distributed computing Protocols computer networks computer network reliability System testing Laboratories

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Quantum Privacy Amplification and the Security of Quantum Cryptography over Noisy Channels

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Physical Review Letters 1996年第13期77卷 2818-2818页

作者： David Deutsch Artur Ekert Richard Jozsa Chiara Macchiavello Sandu Popescu Anna Sanpera Clarendon Laboratory Department of Physics University of Oxford Parks Road Oxford OX1 3PU United Kingdom School of Mathematics and Statistics University of Plymouth Plymouth Devon PL4 8AA United Kingdom Department of Electrical Computer and Systems Engineering Boston University Boston Massachusetts 02215

Existing quantum cryptographic schemes are not, as they stand, operable in the presence of noise on the quantum communication channel. Although they become operable if they are supplemented by classical privacy-amplification techniques, the resulting schemes are difficult to analyze and have not been proved secure. We introduce the concept of quantum privacy amplification and a cryptographic scheme incorporating it which is provably secure over a noisy channel. The scheme uses an “entanglement purification” procedure which, because it requires only a few quantum controlled-not and single-qubit operations, could be implemented using technology that is currently being developed.

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Ionospheric TEC observations from TOPEX satellite

Ionospheric TEC observations from TOPEX satellite

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IEEE International Conference on Plasma Science (ICOPS)

作者： J.A. Vladimer V.R. Ewell M.C. Lee P.H. Doherty D.T. Decker D.N. Anderson J.A. Klobuchar Electrical Computer and Systems Engineering Department Boston University Boston MA USA Institute for Scientific Research Boston College Graduate School Newton MA USA Phillips Laboratory. Hanscom Air Force Base Ionospheric Effects Branch MA USA

Summary form only given. Variability of total electron content (TEC) in the equatorial anomaly region of the ionosphere can be studied extensively using the results of measurements taken by the NASA/CNES satellite, TOPEX/Poseidon, which provides global ocean coverage (0 to 360 degrees longitude, -66 to +66 degrees latitude). The NASA radar altimeter (NRA) is the first spaceborne dual-frequency altimeter capable of accurately measuring vertical ionospheric TEC below 1340 km. TOPEX TEC observations have already been used to support results from an ionospheric measurement campaign that was conducted in equatorial anomaly regions of South America by Phillips laboratory in Spring, 1994. The best agreement in TEC values is seen during intervals of longitudinal proximity of the satellites' paths. Vertical measurements from TOPEX are obtained at a rate of one per second at 5.3 and 13.6 GHz. Along the same surface tracks every 10 days during which global ocean coverage is accomplished. TOPEX data records from 9/92 to 9/95 have been processed and reduced to one CDROM disc using one degree averaging over 110 km. Along track for evaluation of TEC measurements. Various plotting programs have been developed to represent the data for observation of TEC values and the occurrence of the equatorial anomaly. To facilitate further TEC studies, interface software has been prepared to provide easy access to specific dates, local times and longitudes with identification of anomaly formation and structure. The TOPEX over-ocean data can be used as a supplement to land based measurements in applications to ionospheric research at low and middle latitudes. This study focuses on comparisons between TOPEX vertical TEC data and GPS equivalent vertical TEC measurements taken near the East and West coastal regions of South America. Also the Phillips laboratory Global Parameterized Ionospheric Model (PIM) is utilized in an effort to estimate slant to vertical conversion errors.

关键词： Satellites Sea measurements NASA Oceans Spaceborne radar South America Laboratories Radar tracking Electrons Ionosphere

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Ionospheric equatorial anomaly formation over Pacific and Atlantic oceans measured by NASA TOPEX satellite

Ionospheric equatorial anomaly formation over Pacific and At...

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IEEE International Conference on Plasma Science (ICOPS)

作者： V.R. Ewell J.A. Vladimer M.C. Lee P.H. Doherty D.T. Decker D.N. Anderson J.A. Klobuchar Electrical. Computer and Systems Engineering Department Boston University Boston MA USA Institute for Scientific Research Boston College Graduate School Newton MA USA Ionospheric Effects Branch Air Force Base Philips Research National Laboratory MA USA

Summary form only given. Previous ionospheric observations have measured total electron content (TEC) values at fixed land based locations. These observations suggest the existence of longitudinal variations in TEC values. Complementing ground data, the current NASA TOPEX mission is providing TEC data collected over oceans as a function of latitude, longitude and time starting from September 1992. With this broad data base, the authors show a more complete picture of the longitudinal dependance between the Atlantic and Pacific ocean regions and relate this dependance to plasma drifts. Periods during June and December solstice, and March and September equinox in the years 1992, through 1995, are picked to study the low-latitude regions spanning the Atlantic and Pacific oceans. TEC isodensity contours are presented by latitude versus longitude at common local time. The authors correlate these contours with results from the Phillips laboratory ionospheric model.

关键词： Oceans Sea measurements NASA Laboratories Plasma density Observatories Hafnium Gravity Resistance heating Satellites

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OPEN FAULTS IN BICMOS GATES

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IEEE TRANSACTIONS ON computer-AIDED DESIGN OF INTEGRATED CIRCUITS AND systems 1995年第5期14卷 567-575页

作者： MA, SC MCCLUSKEY, EJ Center for Reliable Computing Computer Systems Laboratory Department of Electrical Engineering and Computer Science University of Stanford Stanford CA USA

Opens in BICMOS structures are analyzed here. It is shown that some opens cannot be detected by stuck-fault or other functional tests, since some transistors in BiCMOS gates do not affect the logical function of the gate. A switch-level model for CMOS circuits is extended to include bipolar devices. With this switch-level model, opens that cannot be detected by stuck-faults or other functional tests are easily identified. It is also shown that, in BICMOS circuits, an open defect in one transistor can accelerate the wearout of another nondefective transistor.

关键词： BiCMOS integrated circuits Circuit faults Circuit testing Semiconductor device modeling Logic testing Delay MOSFETs Switching circuits Acceleration CMOS technology

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A STATISTICAL LOAD DEPENDENCY MODEL FOR CPU ERRORS AT SLAC

A STATISTICAL LOAD DEPENDENCY MODEL FOR CPU ERRORS AT SLAC

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International Symposium on Fault-Tolerant computing (FTCS)

作者： R.K. Iyer D.J. Rossetti CENTER FOR RELIABLE COMPUTING Computer Systems Laboratory Departments of Electrical Engineering and Computer Science University of Stanford Stanford CA USA

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Time scale combining of conservative parallel discrete event simulations

Time scale combining of conservative parallel discrete event...

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International Symposium on Parallel Processing

作者： H. Sellami S. Yalamanchili Computer Systems Research Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

Very often many parameterized trials of a simulation are required. Modifying parameters of a simulation will often only modify a fraction of the work. This paper proposes time scale combining (TSC) to combine multiple independent simulation trials by sharing common events and inter-processor communication messages across distinct simulations. As a result, some of the overhead experienced in parallel computation can be amortized across these multiple simulations, reducing the total time required to execute all of the simulations. The results from an experimental evaluation on both asynchronous and synchronous parallel architectures are presented.< >

关键词： Discrete event simulation Computational modeling Laboratories Radio access networks Parallel processing Trions Concurrent computing Clocks Error correction

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Multiple perspective interactive video

Multiple perspective interactive video

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IEEE International Conference on Multimedia computing and systems (ICMCS)

作者： R. Jain K. Wakimoto Visual Computing Laboratory Electrical and Computer Engineering University of California San Diego CA USA Computer and Information Systems Laboratory Mitsubishi Electric Corporation Limited Kamakura Kanagawa Japan

We present our approach to Multiple Perspective Interactive (MPI) video. In MPI video, a viewer could view an event from multiple perspectives, even based on the contents of the events. Using strategically located multiple cameras a set of image sequences is obtained and used to build a 3-dimensional model of the important events in a scene. Considering the request of a user, the system decides the best camera at every time instant and edits image sequences from these camera, much like an editor in standard live sport events, to provide a user the video sequence of the episode from the user's desired perspective. Our system features automatic camera selection and interaction using three-dimensional cursors. We present results of a prototype which is a part of our early efforts to establish a framework of MPI video. Our prototype is a football video retrieval system. We present our results to concretely show the concept of the interactive video.

关键词： Cameras Video on demand Laboratories Prototypes Multimedia communication TV broadcasting Information systems Image sequences Layout Streaming media

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A comparison of a single-carrier system using a DFE and a coded OFDM system in a broadcast Rayleigh-fading channel

A comparison of a single-carrier system using a DFE and a co...

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IEEE International Symposium on Information Theory

作者： S.K. Wilson J.M. Cioffi School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Information Systems Laboratory University of Stanford Stanford CA USA

This paper compares the coded orthogonal frequency division multiplexing (COFDM) system and a single-carrier system using decision feedback equalization (DFE) in a Rayleigh-fading environment assuming perfect knowledge of the channel and ignoring error propagation in the DFE. Analytic techniques are introduced to bound the average probability of error of a single-carrier system using decision-feedback equalization and the average probability of error of a COFDM system in a two-path fading channel.

关键词： OFDM Broadcasting Decision feedback equalizers Fading Filtering Matched filters Rayleigh channels Knowledge engineering Frequency division multiplexing computer errors

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Integrating evolutionary computation with neural networks

Integrating evolutionary computation with neural networks

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Electronic Technology Directions to the Year 2000

作者： E. Vonk L.C. Jain L.P.J. Veelenturf R. Hibbs Control Systems and Computer Engineering Group BSC Laboratory for Network Theory Department of Electrical Engineering University of Twente Enschede Netherlands Knowledge-based Engineering Systems Group School of Electronic Engineering University of South Australia Adelaide Australia

There is a tremendous interest in the development of the evolutionary computation techniques as they are well suited to deal with optimization of functions containing a large number of variables. This paper presents a brief review of evolutionary computing techniques. It also discusses briefly the hybridization of evolutionary computation and neural networks and presents a solution of a classical problem using neural computing and evolutionary computing techniques.< >

关键词： Evolutionary computation Neural networks Biological cells Genetic programming Genetic algorithms systems engineering and theory computer networks Knowledge engineering Genetic mutations Control systems

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