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International Conference on computer communications and Networks (ICCCN)

作者： L.T. Chen Leslee Xu T. Suda T. Yamamoto K. Obinata Department of Information and Computer Science University of California Irvine CA USA Nippon Steel Information and Communication Systems Inc. Japan

In this paper, object-oriented techniques and concepts (e.g., object migration inheritance delegation) and reflection are applied to the design of a distributed system called the reflective object-oriented distributed system (RODS). RODS hides object distribution and underlying platform heterogeneity to simplify the development of distributed multimedia applications. RODS has two major components: the flexible multimedia object adaptor (FMOA) and the reflective object request broker (RORB). The FMOA is an application framework of classes to facilitate the construction of distributed multimedia applications. The RORB is a CORBA object request broker that integrates additional features such as smart proxies, delegation, migration, and sharing. By utilizing a reflective model, RORB allows the application programmer and the system to dynamically modify distributed object management policies.

关键词： Multimedia systems Reflection Object oriented modeling distributed computing Steel Programming profession computer architecture computer science Operating systems Protocols

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A Reflective Object-Oriented distributed System For Heterogeneous Multimedia Environments

A Reflective Object-Oriented Distributed System For Heteroge...

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IEEE Workshop on the Architecture and Implementation of High Performance communication Subsystems

作者： L.T. Chen L. Xu T. Suda T. Yamamoto K. Obinata Department of Information and Computer Science University of California Irvine CA USA Nippon Steel Information and Communication Systems Inc. Japan

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Human figure synthesis and animation for virtual space teleconferencing

Human figure synthesis and animation for virtual space telec...

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IEEE Annual International Symposium Virtual Reality

作者： K. Singh J. Ohya R. Parent Department of Computer & Information Science Ohio State Uinversity Columbus OH USA ATR Communication Systems Research Laboratories Kyoto Japan

Human figure animation is it widely researched area with many applications. This paper addresses specific issues that deal with the synthesis, animation and environmental interaction of human figures within a virtual space teleconferencing system. A layered representation of the human figure is adopted. Skeletal posture is determined from magnetic sensors on the body, using heuristics and inverse kinematics. This paper describes the use of implicit function techniques in the synthesis and animation of a polymesh geometric skin over the skeletal structure. Implicit functions perform detection and handling of collisions with an optimal worst case time complexity that is linear in the number polymesh vertices. Body deformations resulting from auto-collisions are handled elegantly and homogeneously as part of the environment. Further, implicit functions generate precise collision contact surfaces and have the capability to model the physical characteristics of muscles in systems that employ force feedback. The real time implementation within a virtual space teleconferencing system, illustrates this new approach, coupling polymesh and implicit surface based modeling and animation techniques.

关键词： Humans Animation Teleconferencing Magnetic sensors Kinematics Skin Character generation Muscles Force feedback Real time systems

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Extended sonar sequences

Extended sonar sequences

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IEEE International Symposium on Information Theory

作者： O. Moreno S.W. Golomb C.J. Corrada Department of Mathematics and Computer Science University of Puerto Rico Puerto Rico Communication Science Institute Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

Sonar as well as other related sequences were introduced by Golomb and Taylor (1982). Following a similar approach, we introduce the concept of an extended sonar sequence. It is similar to that of a sonar sequence but blank columns are permitted. Several constructions of extended sonars are given. Our constructions are very close to ordinary sonar sequences. However they provide good improvements to the list of the best known constructions for sonar sequences up to 100 symbols given previously (Moreno et al., 1992).

关键词： Sonar applications Sonar equipment Mathematics computer science Doppler effect Costs Radar applications Frequency synchronization Crystallography

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Monitoring progress with dynamic programming envelopes

Monitoring progress with dynamic programming envelopes

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： R.S. Amant Y. Kuwata P.R. Cohen Computer Science Department University of Massachusetts Amherst MA USA R & D Section NTT Data Communication Systems Company Kanagawa Japan

Envelopes are a form of decision rule for monitoring plan execution. We describe one type, the DP (dynamic programming) envelope, that draws its decisions from a look-up table computed off-line by dynamic programming. Based on an abstract model of agent progress, DP envelopes let a developer approach execution monitoring as a problem that is independent of issues in agent design. We discuss the application of DP envelopes to a small transportation planning simulation, and discuss the issues that arise in an empirical analysis of the results.

关键词： Dynamic programming computerized monitoring computer science Table lookup Transportation Computational modeling Analytical models Intelligent agent Libraries Condition monitoring

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FAULT-TOLERANT ASSOCIATE MEMORIES

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systems AND computerS IN JAPAN 1995年第7期26卷 1-12页

作者： FUJIWARA, E TANAKA, T Member Faculty of Engineering Tokyo Institute of Technology Tokyo Japan 152 Eui Fujiwara:received his B.S. and M.S. degrees in Electronics Engineering in 1968 and 1970 respectively and his Dr. of Eng. degree in 1981 all from Tokyo Institute of Technology. In 1970 he joined the NTT Musashino Electrical Communication Laboratories and engaged in developing PIPS-1 and PIPS-11 computer systems. In 1988 he joined the Department of Computer Science Tokyo Institute of Technology as an Associate Professor. In 1990 he became a full Professor. He was a Visiting Professor at the Center for Advanced Computer Studies the University of Southwestern Louisiana from June 1985 to July 1986. His current research interests include coding theory for computers fault-tolerant memories VLSI defect-toleranceand WSI systems. He is a co-author ofError Control Coding for Computer Systems(Prentice-Hall1989) EssentiaLF of Error-Correcting Coding Techniques (Academic Press 1990) and other books. Dr. Fujiwara received the Young Engineer Award from the I.E.I.C.E. in 1978 and the Teshima Memorial Research Award in 1991. He is a senior member of the IEEE and a member of the Information Processing Society Japan. Associate Member

Because of its capability of high-speed search, the associative memory (CAM) is expected to be used in a variety of information processing systems. In this paper, novel fault-tolerant techniques which are effective for on-line use are proposed for TLB which is an example of the application of CAM. First, fault and error models of the TLB consisting of the CAM part and the SRAM part are clarified. Then, the fault-tolerant techniques for these faults and errors, such as distance separable technique, cod-ing technique, simplified 1-out-of-n check and graceful degradation, are proposed. The distance separable technique which encodes the data stored in the CAM part is the one which masks the faulty CAM part and prevents errors from propagating to the subsequent circuits. The coding technique checks the one-to-one correspondence between the data in the CAM and those in SRAM by using the SEC-DED code with byte error detection capability, i.e., SEC-DED-SbED code, and at the same time it detects and corrects errors in the data stored in SRAM. The simplified 1-out-of-n check processes association errors. The graceful degradation gives a flag in the faulty memory section and prevents it from being used. The methods proposed in this paper are evaluated from area augmentation and error detection capability perspectives. The results show that the fault-tolerant TLB with 32 virtual address bits, 32 physical address bits and 128 entries gives single fault detection probability of nearly 99 percent with 28 percent area increase.

关键词： CAM TLB DISTANCE SEPARABLE TECHNIQUE CODING TECHNIQUE SIMPLIFIED 1-OUT-OF-N CHECK GRACEFUL DEGRADATION

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A distributed MEDIA ACCESS PROTOCOL FOR PACKET RADIO NETWORKS AND PERFORMANCE ANALYSIS .2. NETWORK SET-UP TIME AND DATA RATE

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INTERNATIONAL JOURNAL OF communication systems 1995年第1期8卷 49-63页

作者： POND, LC LI, VOK Communication Sciences Electrical Engineering Systems University of Southern California Los Angeles CA 90089-2565 U.S.A. Lawrence C. Pond received the M.Sc. and Ph.D. degrees in electrical engineering from the University of Southern California in 1983 and 1990 respectively. Dr. Pond is currently a scientist at Hughes Space and Communications Company having joined in 1980. He has worked in the fields of communication system design mobile communication network and spacecraft payload design. He is currently working on the development of satellite-based ATM transport and switching architectures for BISDN and Defense Information System Network amlications. Dr. Pond is a member of IEEE. Victor O. K. Li was born in Hong Kong in 1954. He received his SB SM and Sc.D. degrees in Electrical Engineering and Computer Science from the Massachusetts Institute of Technology Cambridge Massachusetts in 1977 1979 and 1981 respectively. Since February 1981 he has been with the University of Southern California (USC) LOS Angeles California where he is Professor of Electrical Engineering and Director of the USC Communication Sciences Institute. He has published 150 technical papers and has lectured and consulted extensively around the world. His research interests include high-speed communication networks personal communication networks intelligent networks distributed databases queueing theory graph theory and applied probability. Dr. Li is very active in the Institute of Electrical and Electronic Engineers (IEEE) having been a member of the Computer Communications Technical Committee since 1983 and having served as Chairman from 1987–1989. He served as Chairman of the Los Angeles Chapter of the IEEE Information Theory Group from 1983–1985. He is the Steering Committee Chair of the International Conference on Computer Communications and Networks (IC3 N) General Chair of the 1st Annual IC3N held in San Diego California in June 1992 General Chair and Technical Program Chair of the 4th IEEE Workshop on Comp

In this, the second part of a two-part paper, the required time for establishing a mobile packet radio network using the virtual circuit and time division multiple access protocol developed in Part 1 is analysed. Tools are developed to determine the virtual circuit and network set-up times in terms of the channel bandwidth allocated to establish and maintain the network. The tools are then extended to include the effects of user mobility. Then these results are combined with the network capacity results of Part 1 to analyse the trade-off between the data rate and set-up time of the network. Next a hierarchical architecture is proposed and the network data rate versus set-up time trade-off of this architecture is analysed using these tools. This architecture is shown to both provide a higher data rate and establish faster than flat networks of the same number of nodes.

关键词： PACKET RADIO NETWORK EPLRS distributed NETWORK TDMA VIRTUAL CIRCUITS MULTIHOP NETWORK BOUNDED DELAY MOBILITY NETWORK SET-UP TIME HIERARCHICAL NETWORK NETWORK DATA RATE

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A METHOD FOR PREDICTING CHAOTIC TIME-SERIES WITH OUTLIERS

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ELECTRONICS AND communicationS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC science 1995年第5期78卷 44-53页

作者： ITOH, K Member NTT Communication Science Laboratories Yokosuka Japan 238-03 Ken-ichi Itoh received his B.E. degree in 1969 from the Department of Electrical Engineering Kyushu Institute of Technology and affiliated with NTT. He is engaged in research and development of computer hardware systems. At present he is Senior Research Engineer Supervisor NTT Communications Science Laboratories. He is a member of the Information Processing Society.

In recent years, there have been intensive studies on the short-term, prediction method for time-series data with chaotic properties. The prediction for the chaotic time-series data is executed, for example, as follows. Based on the single-variable time-series data, the trajectory of the attractor is reconstructed in the multidimensional space and the change of the trajectory is predicted by a polynomial approximation. However, when there exists a noise such as the outlier in the time-series, the prediction error is increased drastically. To solve this problem, this paper proposes a prediction method which is robust against the outlier. More precisely, the following three elaborations are added to the conventional method: (1) the coefficients of the polynomial are calculated by Biweight's estimation method;(2) the order of the polynomial is determined automatically examining the residual error;and (3) the data with a large prediction error are replaced by the predicted value and the next prediction is applied. An evaluation experiment is executed for the data where the pseudorandom variable with the Cauchy distribution is superposed on the chaotic time-series data generated by the Henon map and the Lorenz model. It is verified as a result that the proposed method can well suppress the increase of the prediction error due to the outliers, improving greatly the accuracy of the prediction compared to the conventional method.

关键词： CHAOS PREDICTION TIME-SERIES LEAST-SQUARES METHOD OUTLIER

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PARALLEL AND distributed TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

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REQUIREMENTS FOR PARALLEL PROGRAMMING IN OBJECT-ORIENTED distributed systems

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computer JOURNAL 1994年第6期37卷 499-508页

作者： TANGNEY, B CONDON, A CAHILL, V HARRIS, N [*]Distributed Systems Group Department of Computer Science Trinity College Dublin 2 Ireland

In this paper we present some ideas on the functionality that should be incorporated into an object-oriented distributed system to support distributed and parallel programming. The work is based on practical experience in developing several substantial distributed and parallel applications on the Amadeus platform. Related work in the area is sketched.

关键词： computer programming

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