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Annual Hawaii International Conference on System sciences (HICSS)

作者： C. Bussler S. Jablonski Department of Computer Science Institute of System Architecture Technical University of Darmstadt Darmstadt Germany Institute Database Systesm University Erlangen-Nuünberg Erlangen Germany

We introduce policy resolution (PR) for workflow management systems (WFMS) as service to assign work to agents. Policy resolution is a framework for defining arbitrary role and organization models together with operat... 详细信息

关键词： Workflow management software Computational Intelligence Society Management information systems Humans computer science Database systems Postal services Collaborative software Collaborative work Context modeling

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Policy resolution for workflow management systems 28

Policy resolution for workflow management systems

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28th Annual Hawaii International Conference on System sciences, HICSS 1995

作者： Bussler, C. Jablonski, S. Digital Equipment GmbH AIT Vincenz-PrieBnitz-Str. 1 KarlsruheD-76131 Germany Technical University of Darmstadt Department of Computer Science Institute of System Architecture Alexanderstr. 10 DarmstadtD-64283 Germany University of Erlangen-Nurnberg Institute of Database Systems Martensstr. 3 ErlangenD-91058 Germany

ISBN: (纸本)0818669306

关键词： Work simplification

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On the complexity of statistical reasoning

On the complexity of statistical reasoning

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Israel Symposium on the Theory of Computing and Systems

作者： J. Kilian M. Naor NEC Research Institute Inc. Princeton NJ USA Development Chair Department of Applied Mathematics and Computer Science Weizmann Institute Incumbent of the Morris and Rose Goldman Career Rehovot Israel

We show that basic problems in reasoning about statistics are NP-hard to even approximately solve. We consider the problem of detecting internal inconsistencies in a set of statistics. We say that a set of statistics is /spl epsiv/-inconsistent if one of the probabilities must be off by at least /spl epsiv/. For a positive constant /spl epsiv/, we show NP-hard to distinguish /spl epsiv/-inconsistent statistics from self-consistent statistics. This result holds when restricted to complete sets of pairwise statistics over Boolean domains. We next consider what may, be determined about distributions with a given (consistent) set of pairwise statistics over Boolean domains. We show it NP-hard to distinguish between the case that Pr(X/sub i//spl and/X/sub j/) is necessarily 0 and the case that Pr(X/sub i//spl and/X/sub j/) can have any value in [0, 1/2 ]. Similarly, we show it NP-hard to distinguish between the case that |Corr(X/sub i/, X/sub j/)|=-1 and the case that |Corr(X/sub i/, X/sub j/)| is unconstrained. Whereas the connection between PCP and hardness of approximations has been known since Feige et al. (1991), we introduce the application of "zero-knowledge" PCP's as a tool for proving NP-hardness results for approximation problems.< >

关键词： Statistical distributions Statistics Application software Career development Mathematics computer science

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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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DETERMINATION OF EXTREME SEAS ENCOUNTERED BY OPERATIONAL SHIPS

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NAVAL ENGINEERS JOURNAL 1995年第3期107卷 197-215页

作者： ZAHN, PB GRIM, M Mr. Zahn received a B.S. degree in Naval Architecture and Marine Engineering from Webb Institute in 1980 and has published various papers on offshore systems computer tools for engineering and operations and icebreaker design and performance. He is a member of ASNE and SNAME Mr. Grim received a Bachelor of Science in Ocean Engineering from Virginia Polytechnic Institute and State University in 1992. He is a member of SNAME

In March of 1993, components of a CVN Battle Group deploying to the Mediterranean encountered heavy seas in the area between Norfolk and Bermuda, This was the storm referred to in the press as The Blizzard of '93. The ships involved reported damage as a result of wave action, but continued their transit without incident and with full mission capability intact. In order to investigate the damage, it was necessary to determine what the encountered wave conditions were. Because the probable time of damage was at night, with no visual observations available, as well as because of the large variations in reported conditions, it was decided that other methods would be investigated to determine the actual conditions encountered. Four data sources were used in an attempt to determine the encountered wave conditions. This paper describes the data sources, the comparison of the data, and the conclusion that, while severe, the conditions are not likely to represent the lifetime maximum for design.

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An implementation of parallel production systems with two load balancing mechanisms

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SYSTEMS AND computerS IN JAPAN 1995年第14期26卷 1-14页

作者： Miyazaki, J Yokota, H Member School of Information Science Japan Advanced Institute of Science and Technology Ishikawa-ken Japan 923 Received his B.E. degree from Tokyo Institute of Technology Tokyo Japan in 1992 and his M.S. degree from Japan Advanced Institute of Science and Technology (JAIST) Ishikawa Japan in 1994. He is a Ph.D. student at School of Information Science JAIST. His research interests include parallel rule base systems active database systems and high performance I/O systems. He is a member of the Institute of Electronics Information and Communication Engineers of Japan and Information Processing Society of Japan. Received his B.E. M.E. and Dr. of Eng. degrees from Tokyo Institute of Technology in 1980 1982 and 1991 respectively. He joined Fujitsu Ltd. in 1982 and was a researcher at the Institute of New Generation Computer Technology (ICOT) from 1982 to 1986 and at Fujitsu Laboratories Ltd. from 1986 to 1992. He is an Associate Professor of School of Information Science Japan Advanced Institute of Science and Technology (JAIST). HIS research interests include parallel computer architecture for databases and data engineering. He is a member of IPS I.E.I.C.E. JSAI IEEE and ACM.

An implementation method is proposed for parallel production systems on multicomputers, or message-passing computers, to speed up execution time. There have been proposed parallel production systems using hash mechanism, but they cause a skewed load distribution problem. To obtain more efficient balance of load, the method addressed here and named clustered parallel production systems (CPPS) adopts two load balancing strategies: hash and demand-driven. Taking account of the cost of termination detection, the execution time of the CPPS and simple hash method are estimated, and implement on an nCube2. The estimation meets the execution results. The CPPS provides much better load balance to improve scalability.

关键词： parallel production system multicomputer message-passing parallel computer load balancing

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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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A Sophisticated Ground Water Analytical Tool

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Groundwater Monitoring & Remediation 1995年第2期15卷 134-139页

作者： Tonjes, David J. Heil, James H. Black, John A. David J. Tonjes is a doctoral candidate in coastal oceanography at the Marine Sciences Research Center University at Stony Brook through its Waste Management Institute (Waste Management Institute Marine Sciences Research Center University at Stony Brook 11794–5000). Under a grant from the Town Board he is a technical adviser to the commissioner of waste management of the town of Brookhaven New York in solid waste planning regulatory compliance and environmental site monitoring. Tonjes has a B.A. in liberal arts from St. John's College an M.S. in computer science from New York Institute of Technology and an M.S. in technological systems management from the University at Stony Brook. James H. Heil is commissioner of waste management for the town of Brookhaven (Department of Waste Management Town of Brookhaven 3233 Rte. 112 Medford NY 11763). Heil received a B.S. from Manhattan College and an M.S. from New York University in civil engineering and is a licensed professional engineer in New York. He is a former president of the New York State Solid Waste Management Association. John A. Black is the coordinator of the environmental science program at Suffolk County Community College (Environmental Science Program Suffolk County Community College Selden NY 11784). He is currently the chair of the Ecology Committee of the Pine Barrens Advisory Committee for Suffolk County and is a member of the Suffolk County Pine Barrens Review Commission. Black received a B.S. in chemistry from Adephi University an M.S. in public administration from the University at Stony Book an M. S. from Hofstra University and a Ph. D. from Adlephi in marine sciences.

Stiff diagrams arc a multivariate method of analysis used to describe the chemical state of ground water. The use of Stiff diagrams to describe multiconstituent contamination sites, such as landfills, has distinct advantages over single constituent analyses. Problems associated with traditional Stiff diagram analyses, such as diagram attentuation, can be addressed by allowing the scale of the diagram to vary with the ionic strength of the analyzed sample. The use of these sliding scale Stiff diagrams reveals the chemical slate of the ground water over wide ranges of constituent concentrations and thus allows for sensitive and sophisticated depictions of complicated contamination sites in a fashion that is extremely difficult to replicate with single constituent analyses. This approach has possible applications for understanding and tracing the mixing and chemical changes in uncontaminated settings. Copyright © 1995, Wiley Blackwell. All rights reserved

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Linear Phase Shift Response with High Dynamic Range for Holographic Recording in As₂S₃

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Optical Review 1994年第1期1卷 36-38页

作者： Dietrich, Christoph H. Noehte, Steffen Männer, Reinhard Chair of Computer Science V University of Mannheim Mannheim Germany Physical Institute University of Heidelberg Heidelberg Germany

Amorphous As2S3 films are real-time photographic materials for phase holograms. This work focuses on the phase shift in As2S3 films as a function of the exposure. A method for measuring the phase shift response and th... 详细信息

Amorphous As₂S₃ films are real-time photographic materials for phase holograms. This work focuses on the phase shift in As₂S₃ films as a function of the exposure. A method for measuring the phase shift response and the exposure simultaneously is presented. A relative displacement determination of interferometric patterns allows precise measurements insensitive to changes of experimental conditions. The phase shift dependence on the intensity of the writing beam is evaluated for two different films. As a result, a linear phase shift response is obtained with a dynamic range of nearly π. It is independent of the intensity over four orders of magnitude. The results are proofed by diffraction efficiency measurements. © 1994, Japan Society of Applied Physics. All rights reserved.

关键词： As2S3 holographic recording materials interferometric phase shift measuring linear phase recording

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ISDN LOOP EXTENSION USING A MID-SPAN AMPLIFIER

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 219-224页

作者： ERKER, GJ DODDS, DE KRZYMIEN, WA David E. Dodds was born in Saskatoon Canada in 1945. He received the B. Eng. and MSc. degrees from the University of Saskatchewan in 1966 and 1968 respectively. He worked with Bell Northern Research (Ottawa) on PBX design in 1969 1972 and 1978. Since 1969 he has been with the University of Saskatchewan where he is currently Professor of Electrical Engineering. He teaches courses in electronics and communications and also presents short courses on the fundamentals of telephony. Current research interests are in data transmission signal processing architecture and frame synchronization for PCM and spread spectrum systems. He has been granted five patents relating to commercial products in delta-modulation telephone line interfacing and computer data transmission. In 1986 he was on sabbatical leave at BNR Inc. and worked with an ANSI committee on the standardization of FDDI-II a combined voice and data system. Mr. Dodds is a Registered Consulting Engineer in Saskatchewan. Witold A. Krzyden received his MSc. (Eng.) and Ph.D. degrees (both in Electrical Engineering) in 1970 and 1978 respectively from the Poznan Technical University in Poznan Poland. He was awarded the Minister's of Science and Technology Prize of Excellence for his Ph.D. thesis. From 1970 to 1978 he was a Research Engineer and Teaching Assistant and then from 1978 to 1980 an Assistant Professor of Electrical Engineering at the Poznan Technical University. In 1980 he won a Dutch Government Research Fellowship at the Twente University of Technology in Enschede the Netherlands for the year of 1980/1981. In the following year of 1981/82 he was a Research Assistant Professor there. From 1982 to 1986 he was an Assistant Professor of Electrical Engineering at Lakehead University in Thunder Bay Ontario Canada. In 1986 he joined the Univeristy of Alberta and Alberta Telecommunications Research Centre (now Telecommunications Research Laboratories or TRLabs) as an Associate Professor of Electrical Engineering. Currently he is a Professor of E

The 5.5 km range of the basic rate ISDN loop has been extended by using a negative impedance amplifier and by using a 2 wire/4 wire (2w/4w) amplifier. The negative impedance amplifier extends the range of the loop by 1.0 km, whereas the 2w/4w amplifier extends the range by 1.5 km at the expense of increased complexity. As part of the amplifer design, a resistor/capacitor network has been developed which closely matches the characteristic impedance of telephone cable. Error rate tests have been conducted using various lengths of cable and an operating ISDN line.

关键词： ISDN PHYSICAL LAYER BASIC RATE LOOP RANGE EXTENSION

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