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EUROMICRO Conference

作者： Jinsoo Yoon Yigal Hoffner Kilnam Chon Department of Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea Architecture and Project Management Limited Cambridge UK

ISBN: (纸本)0818664304

In this paper, we assert that window system plays a fundamental role in supporting multiple interaction channels distributed over a finite number of I/O devices. For historical as well as technical reasons, window systems usually deal with the issues which concern distribution of window system components, heterogeneity, user interface, multimedia, and distributed application support. We propose a minimal window system architecture which allows separate treatment of these issues. The minimal window-system architecture serves as a basis for discussing the influence of these issues on each other. Also in the viewpoint of the transparency facilities inherent in a distributed system, a window system model based on the minimal window system is proposed for the distributed environment.< >

关键词： Application software computer architecture User interfaces Distributed computing Multimedia systems Workstations computer science Project management Operating systems computer networks

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Optimization Of Critical Paths In Circuits With Level-sensitive Latches 94

Optimization Of Critical Paths In Circuits With Level-sensit...

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IEEE International Conference on computer-Aided Design

作者： T.M. Burks K.A. Sakallah Systems Technology and Architecture Division IBM Corporation Austin TX USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

ISBN: (纸本)9780897916905

A simple extension of the critical path method is presented which allows more accurate optimization of circuits with level-sensitive latches. The extended formulation provides a sufficient set of constraints to ensure that, when all slacks are non-negative, the corresponding circuit will be free of late signal timing problems. Cycle stealing is directly permitted by the formulation. However, moderate restrictions may be necessary to ensure that the timing constraint graph is acyclic. Forcing the constraint graph to be acyclic allows a broad range of existing optimization algorithms to be easily extended to better optimize circuits with level-sensitive latches. We describe the extension of two such algorithms, both of which attempt to solve the problem of selecting parts from a library to minimize area subject to a cycle time constraint.

关键词： Latches Delay effects Flip-flops Costs Timing Utility programs Combinational circuits Sequential circuits Circuit analysis Libraries

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Predicting the drape of woven cloth using interacting particles 94

Predicting the drape of woven cloth using interacting partic...

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21st Annual Conference on computer Graphics and Interactive Techniques, SIGGRAPH 1994

作者： Breen, David E. House, Donald H. Wozny, Michael J. European Computer-Industry Research Centre Design Research Center Rensselaer Polytechnic Institute Arabellastrasse 17 MunichD-81925 Germany Visualization Laboratory Texas A and M University Department of Computer Science Williams College College of Architecture College StationTX77843-3137 United States National Institute of Standards and Technology Design Research Center Rensselaer Polytechnic Institute MEL 220/B322 GaithersburgMD20899 United States

ISBN: (纸本)0897916670

We demonstrate a physically-based technique for predicting the drape of a wide variety of woven fabrics. The approach exploits a theoretical model that explicitly represents the microstructure of woven cloth with interacting particles, rather than utilizing a continuum approximation. By testing a cloth sample in a Kawabata fabric testing device, we obtain data that is used to tune the model's energy functions, so that it reproduces the draping behavior of the original material. Photographs, comparing the drape of actual cloth with visualizations of simulation results, show that we are able to reliably model the unique large-scale draping characteristics of distinctly different fabric types. © ACM 1994.

关键词： Weaving

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Combinatorial pattern discovery for scientific data: some preliminary results 94

Combinatorial pattern discovery for scientific data: some pr...

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Proceedings of the 1994 ACM SIGMOD international conference on Management of data

作者： Jason Tsong-Li Wang Gung-Wei Chirn Thomas G. Marr Bruce Shapiro Dennis Shasha Kaizhong Zhang Computer and Information Science New Jersey Institute of Technology Newark NJ Cold Spring Harbor Laboratory 100 Bungtown Rodad Cold Spring Harbor NY Image Processing Section Laboratory of Mathematical Biology Division of Cancer Biology and Diagnosis National Cancer Institute National Institutes of Health Frederick MD Courant Institute of Mathematical Sciences New York University 251 Mercer Street New York NY Department of Computer Science The University of Western Ontario London Ontario Canada N6A 5B7

ISBN: (纸本)9780897916394

Suppose you are given a set of natural entities (e.g., proteins, organisms, weather patterns, etc.) that possess some important common externally observable properties. You also have a structural description of the entities (e.g., sequence, topological, or geometrical data) and a distance metric. Combinatorial pattern discovery is the activity of finding patterns in the structural data that might explain these common properties based on the *** paper presents an example of combinatorial pattern discovery: the discovery of patterns in protein databases. The structural representation we consider are strings and the distance metric is string edit distance permitting variable length don't cares. Our techniques incorporate string matching algorithms and novel heuristics for discovery and optimization, most of which generalize to other combinatorial structures. Experimental results of applying the techniques to both generated data and functionally related protein families obtained from the Cold Spring Harbor Laboratory show the effectiveness of the proposed techniques. When we apply the discovered patterns to perform protein classification, they give information that is complementary to the best protein classifier available today.

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A NEW TOKEN RING PROTOCOL AND ITS PERFORMANCE FOR SINGLE AND DUAL RING LAN SYSTEMS

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1994年第3期7卷 247-260页

作者： OBAIDAT, MS Department of Electrical Engineering City University of New York The City College Convent Ave. at 140th Street New York NY 10031 U.S.A. Mohammad S. Obaidat:received his B.S.E.E. with distinction from Aleppo University and M.S.E.E. and Ph.D. in Electrical and Computer Engineering from The Ohio State University Columbus Ohio. His previous posts were in the Departments of Electrical and Computer Engineering at Jordan University of Science and Technology and the University of Missouri. At present he is an Associate Professor in the Department of Electrical Engineering at The City College of The City University of New York. Dr. Obaidat is an Associate Editor of theIEEE Transactions on Systems Man and Cybernetics and The Society for Computer Simulation monthly journalSIMULATION.Dr. Obaidat is on the editorial boards ofIEEE Transactions on Instrumentation and measurementandACM Applied Computing Review.He has guest edited a special issue of theSimulation Journalon high speed networking and another issue on high performance computing. He is listed on who is who in the East of USA. Dr. Obaidat has published over 90 technical refereed articles. His research interests are high performance computing/computers performance evaluation of computer systems and networks parallel computing: architecture and algorithms neural networks computer networks pattern recognition image processing and instrumentation and measurement.

This paper presents a new protocol for token ring local computer networks and its performance for single and dual ring networks using simulation modelling. The proposed protocol is a modification of the IEEE 802.5 token ring standard. In this protocol, a station can start transmission if it receives a free token or a data packet passing its interface logic. Idle stations are skipped whenever there is at least one station that has a ready packet to transmit. This is achieved by using two of the reserved bits in the frame status (FS) field. The bits used are called transmission reservation bits (TR-bits). The TR-bits are reset by the sending station and set by the first station that has data to transmit during the round trip of the associated packet along the ring. It is found that the proposed modified token ring (MTR) protocol provides better throughout and delay performance for both the single and dual ring networks. The reduction in mean delay of the MTR as compared to the standard token ring (STR) reaches about 45 per cent under heavy traffic conditions. Moreover, it is found that the performance of the MTR decreases as the packet size increases but remains higher than the corresponding performance of the STR for both the single and dual ring networks. The MTR provides a maximum throughput improvement of about 6 per cent over the STR for both dual and single ring cases. Finally, the proposed protocol (MTR) is easy to implement, with no extra hardware and has low cost/performance characteristics.

关键词： TOKEN RING LAN PROTOCOLS PERFORMANCE EVALUATION DISCRETE-EVENT SIMULATION

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USING VIRTUAL ENVIRONMENTS IN THE DESIGN OF SHIPS

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 91-106页

作者： JONS, OP RYAN, JC JONES, GW Otto P. Jons:received a Diplom Ing. in shipbuilding from the Technical University of Hanover W. Germany and an MS in naval architecture and marine engineering from MIT. He then joined Litton Ship Systems where he was responsible for the preliminary design of the DD-963 hull structure and then for ship system integration as manager LHA ship systems engineering department. From 1972 to 1974 he was the principal research scientist at Hydronautics. In 1974 as technical director he helped establish the Crystal City office of Designers and Planners. Mr. Jons was one of the co-founders of Advanced Marine Enterprises Inc. in 1976 where he serves as corporate vice president engineering. J. Christopher Ryan:earned his bachelors and masters degrees in naval architecture from Webb Institute and MIT respectively. He spent three years at the advanced marine technology division of Litton Industries working on the DD-963 class ship design and related computer aided design projects. He subsequently went to the Navy Department concentrating on early stage design of surface combatants for twelve years including work on the FFG-7 Sea Control Ship CSGN and CVV aircraft carrier projects. He then shifted focus and became the Technical Director for the Computer Supported Design Program in NavSea for five years. Mr. Ryan has served in several supervisory positions within the Ship Design Group in NavSea since that time. He is currently the director of the future ship concepts division. Gary W. Jones:graduated from the University of Tennessee in 1971 with a BS in mechanical engineering and followed up with graduate work at George Washington University and the University of Maryland. Mr. Jones was with the Naval Sea Systems Command from 1971 until 1988 where he was a naval architect in the submarine section of the hull form design division. In 1988 he was detailed to the Defense Advanced Research Projects Agency (DARPA) where he became the program manager for the advanced submarine technology program's hydrodynamic hydroac

A major contributor to the expense and length of time to design, build, and test new systems has been the need to build and test hardware prototypes to determine their effectiveness in meeting operational requirements. Recent and dramatic advances in computer simulation technologies hold forth the promise of revolutionizing design and acquisition strategies by providing the means to validate end users' requirements prior to hardware construction. By designing and operationally testing virtual prototypes in a virtual environment, these technologies will soon offer naval architects the ability to build and launch ships in computer-based cyberspace in lieu of the shipbuilder's ways. The authors of this paper provide the background for these developments, explore the significance and ramifications of these technologies to the current process of ship and system design, outline challenges lying ahead, and present their vision and recommendations for future development.

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Design of neural networks to tolerate the mixture of two types of faults

Design of neural networks to tolerate the mixture of two typ...

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International Symposium on Fault-Tolerant Computing (FTCS)

作者： Y. Tohma Y. Koyanagi Department of Computer Science Tokyo Institute of Technology Tokyo Japan Architecture Division Fujitsu Laboratories Limited Kawasaki Kanagawa Japan

The authors present a design method of neural networks for optimization problems, which can tolerate the simultaneous existence of both stuck-at-zero and stuck-at-one faults. By using this new design method together with one presented earlier, neural networks can tolerate very well the mixture of the both types of faults as well as unidirectional faults.

关键词： Neural networks Fault tolerance Design methodology Design optimization Traveling salesman problems Recurrent neural networks computer science computer applications computer networks Application software

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Binding Energies of Double-Λ Hypernuclei and ΛΛG-Matrix

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Progress of Theoretical Physics 1993年第1期89卷 109-117页

作者： Himeno, Hiroyuki Sakuda, Toshimi Nagata, Sinobu Yamamoto, Yasuo Graduate School of Science and Technology Niigata University Niigata 950-21 Department of Physics Miyazaki University Miyazaki 889-21 Department of Computer Science and Systems Engineering Miyazaki University Miyazaki 889-21 Institute for Nuclear Study University of Tokyo Tanashi 188 and Physics Section Tsuru University Tsuru 402*)

Binding energies of double-Λ hypernuclei10ΛΛBe,13ΛΛB and6ΛΛHe are calculated on the basis ofG-matrix theory in finite nuclei. The core + Λ+ Λ three-body model is adopted and theG-matrix for ΛΛ interaction is treated consistently with the model space. As the bare interaction the Nijmegen model D and model F are used. It is discussed that the consistency of the interaction with the model space is very important to calculate reliably the binding energies. It is shown that if the new event of double-Λ hypernuclei is interpreted as13ΛΛB, model D reproduces the experimental data very well, whereas model F does not.

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A TWO-LEVEL METADATA DICTIONARY APPROACH FOR SEMANTIC QUERY PROCESSING IN MULTIDATABASE SYSTEMS

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International Journal of Software Engineering and Knowledge Engineering 1993年第2期3卷 231-255页

作者： MIIN-JENG PAN SHI-KUO CHANG CHIEN-CHIAO YANG Department of Electronic Engineering National Taiwan Institute of Technology 43 Keelung Road Section 4 Taipei 10772 Taiwan R.O.C. phone: (412)–624–8423 fax: (412)–624–8465. Department of Computer Science University of Pittsburgh Pittsburgh PA 15260 USA

A multidatabase system (MDBS) is a system that integrates several autonomous database systems and provides users with a uniform access to all the databases. In this paper we developed a two-level active metadata dictionary approach for semantic query processing. To capture the global view of data schemas of participating databases which may be heterogeneous, a Hornclause data model is used. The lower-level metadata dictionaries (LLMDs) keep metadata for each corresponding local database in MDBS. The higher-level metadata dictionary (HLMD) integrates the metadata about all LLMDs. The database integration strategy includes two phases: schema translation and schema integration. It is a bottom-up approach integrating schema from the underlying database schemas. The evaluation strategy is a top-down approach. It starts with a query as a global goal to be achieved, unifies and optimizes the query to decompose the goal into subgoals that can be evaluated against extensional database, then translates these subgoals into corresponding queries against underlying DBMSs. To solve the control problem, we employ a G-net model for procedure control and inference control. An experimental implementation in Prolog is described.

关键词： multidatabase system metadata dictionary Horn clause database integration deductive database system semantic query optimization

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SHIPBOARD DAMAGED STABILITY ASSESSMENT - THE FLOODING CASUALTY CONTROL SOFTWARE

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NAVAL ENGINEERS JOURNAL 1993年第3期105卷 152-166页

作者： ZAHN, PB ROSBOROUGH, J CARLSTROM, R Peter B. Zahn:is a section chief in the Naval Architecture Department at Advanced Marine Enterprises. He is responsible for software development and special trials support. He has led the Flooding Casualty Control Software (FCCS) development effort since joining AME in 1989. He is also responsible for the material handling strikedown and stowage (MHS&S) software development program as well as special trials support for the ACVLAP and T-AGOS 19 programs. Prior to joining AME Mr. Zahn spent nine years with various companies of the ARCTEC Group. His experience includes field trials in venues from the Caribbean to the Bering Sea as well as model tests and engineering design and development efforts. Mr. Zahn received his B.S. in naval architecture and marine engineering from Webb Institute in 1980 and has published various papers on pollution prevention offshore systems and icebreaker design and performance. He is a member of ASNE and SNAME. John Rosborough:has been a naval architect for the Naval Sea Systems Command (NavSea) for the past 15 years. He is currently assigned to the Hydrodynamics Division with responsibility for aircraft carrier stability evaluations and as a task leader for computer-aided ship design development. In the Stability Division he was previously responsible for stability analyses on various amphibious ships SWATHs and foreign ships. He manages the upgrade and augmentation of SHCP at NavSea and is the Navy's technical point of contact for evaluating shipboard stability software and transitioning technology to the fleet. Mr. Rosborough received his B.S. in naval architecture and marine engineering from the University of Michigan in 1977. He is a member of USNI and the Association of Scientists and Engineers at NavSea. Richard Carlstrom:is a naval architect with Advanced Marine Enterprises. He has been responsible for software development in support of a variety of major programs including FCCS and SHCP and is a specialist in stability evaluations for complex ships such as CVs CVNs

The Flooding Casualty Control Software (FCCS) was developed under the auspices of the Naval Sea Systems Command (NavSea) and is currently being deployed on a variety of ships in the neets of both the U.S. Navy and the U.S. Coast Guard. The primary objective of FCCS is to enable damage control personnel to identify critical stability conditions, especially when related to the loss of reserve buoyancy due to battle damage and the destabilizing effects of large quantities of firefighting water, in a timely manner. FCCS was initially deploved in 1990. It utilizes the standard algorithms of the Ship Hull Characteristics Program (SHCP). The user interface was designed to allow quick familiarity for shipboard users, primarily the damage control assistant (DCA) and his staff. Intact stability evaluations include the effects of topside icing, high winds, personnel crowding, heavy lifts over the side, high speed turns, and towing. FCCS also supports ballasting analysis for amphibious ships as well as providing bottom reaction and beached stability data for grounding incidents. Bv providing a tool for the ''fuel king'' and DCA to generate the required daily updates on the current ship load and liquids status, FCCS is assured of an accurate baseline in the event of damage. The design allows the evaluation of the ultimate ship stability status for a damage event using simple compartmentation and flooding status inputs. Evaluation of the adequacy of resulting stabilitv, as well as identification of such critical stability parameters as off center loading, margin line immersion, and negative GM, are accomplished by the program. Guidance is provided for the user to initiate appropriate flooding related damage control activities. Initially fitted on USS Oliver Hazard Perry Class frigates, FCCS databases have been for the USCG Hamilton class high endurance cutters, USS Arleigh Burke class Aegis destroyers, and a variety of other U.S. Navy and U.S. Coast Guard ship classes. The progra

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