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4TH INTERNATIONAL WORKSHOP ON COMPILER CONSTRUCTION ( CC 92 )

作者： HOOGERBRUGGE, J CORPORAAL, H Delft University of Technology Department of Electrical Engineering Section Computer Architecture and Digital Systems Netherlands

ISBN: (纸本)3540559841

This paper reports the results of a comparison between a new class of architectures, called transport-triggered architectures, and traditional architectures, called operation-t~iggered architectures. It does this comparison by means of the MOVE-i860, which is a transport-triggered approximation of the i860. Several benchmarks are scheduled for the MOVE-i860 by a software pipelining scheduler. By scheduling according to three scheduling disciplines, we are able to measure the advantages of transport-triggered architectures. The results of the experiments show that transport-triggered architectures perform better than operation-triggered architectures with similar hardware. © 1992, Springer Verlag. All rights reserved.

关键词： Scheduling

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Use of CMOS technology in wave pipelining 5

Use of CMOS technology in wave pipelining

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5th International Conference on VLSI Design, ICVD 1992

作者： Klass, F. Mulder, J.M. Section Computer Architecture and Digital Systems Department of Electrical Engineering Delft University of Technology Netherlands

ISBN: (纸本)0818624655

Wave pipelining is a technique for pipelining digital systems that can increase the clock frequency without increasing the number of storage elements. This is achieved by clocking the system faster than the propagation delay between storage elements. The design of such systems is more difficult because all paths in the combinational logic must have about equal delay. To implement wave pipelining, some technologies seem to be better than others depending on the delay properties. Static CMOS has the disadvantage of pattern-dependent delay variations. This papers discusses the issues concerning the implementation of wave pipelining using CMOS technology. The maximum pipeline rate for a wave-pipelined circuit is calculated under data-dependent delay constraints. Bounding parameters to the system performance are provided. © 1991 IEEE.

关键词： Pipelines

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MIDAS: Design philosophy and internals 11

MIDAS: Design philosophy and internals

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11th Annual International Phoenix Conference on computers and Communication, IPCCC 1992

作者： Kim, Pyung-Chul Choi, Hwan Ik Lee, Yoon-Joon Lee, Sang Ho Kim, Myung-Joon Computer Science Department Korea Advanced Institute of Science and Technology Daejeon Korea Republic of Database Section Electronics and Telecommunications Research Institute Daejeon Korea Republic of

ISBN: (纸本)0780306058

We have developed a multiuser storage system named MIDAS (Multiuser Index-based Data Access System) which is released on July 1991. A capability of handling gigantic data efficiently, high performance, high portability and high tunability are primary goals MIDAS have pursued. This paper describes precisely the internal system structures of MIDAS and the implemented techniques in conjunction with our design philosophy. In order to achieve a high degree of concurrency, the original B+-tree is modified and the various system tables are divided into several independent partitions. A database in MIDAS can have more than one disk volume and a file can be spread over several volumes. We implement an extent-based disk manager by means of the raw device interface to circumvent shortcomings of the UNIX file system. The transaction notion is supported via the strict two-phase locking method with multiple granularity and a hybrid recovery scheme. © 1992 IEEE.

关键词： Digital storage

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IDRIS - INTERACTIVE DESIGN OF REACTIVE INFORMATION-SYSTEMS 4th

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4TH INTERNATIONAL CONF ON ADVANCED INFORMATION SYSTEMS ENGINEERING ( CAISE 92 )

作者： OSMON, P SLEAT, P Systems Architecture Research Centre Computer Science Department City University London EC 1V 0HB United Kingdom Marex Technology Ltd Marex House 88 The High Street Cowes I.O.W. United Kingdom

ISBN: (纸本)3540554815

The IDRIS project is developing a model, a methodology, a notation, and a CASE tool for the interactive design of real-time, or reactive, systems. Increasingly such designs are implemented on parallel hardware, for performance and reliability reasons. The work described here addresses performance, but not reliability, issues. The model describes a real time system in terms of a database and a set of asynchronous tasks. Each task is the system's response to an external stimulus event. A task decomposes into atomic transactions, acting on entities in the database, connected by a control structure which is determined by entity access constraints. Based on a static analysis of these data dependencies, the methodology is able to rely on scheduling rather than conventional locking to control access to the database. The model describes real time systems generally. The methodology concentrates on the class of hard real time systems designs — those which must guarantee to meet the response latency and throughput constraints specified by the requirements. The methodology uses scheduling and allocation heuristics to map tasks and their transactions onto physical processors. The methodology has a number of stages and the designer is assisted by four graphical notations: event context diagrams;data dependency rings for capturing both intra task and inter task data dependencies;precedence graphs for expressing the intra task control structure implied by the data dependencies;Gantt charts for expressing worst case schedules. The methodology assumes a run time environment with a hierarchy of schedulers to control processing and access to data entities. An interactive CASE tool helps the designer capture and manipulate the design information, display partial designs, and perform allocation and scheduling trials against the specification. An example real time system design, for a ship control system, generated using the methodology and the CASE tool, is briefly described. © Springer-

关键词： Scheduling

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MIDAS: design philosophy and internals

MIDAS: design philosophy and internals

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International Phoenix Conference on computers and Communications (IPCCC)

作者： Pyung-Chul Kim Hwan Ik Choi Yoon-Joon Lee Sang Ho Lee Myung-Joon Kim Computer Science Department Korea Advanced Institute of Science and Technology Daejeon South Korea Database Section Electronics and Telecommunications Research Institute Daejeon South Korea

The authors have developed a multiuser storage system named MIDAS (multiuser index-based data access system). They describe the internal structure in conjunction with the design principles of MIDAS. To achieve a high degree of concurrency, the original B/sup +/-tree was modified and the various system tables were divided into several independent partitions. A database in MIDAS can have more than one disk volume and a file can be spread over several volumes. An extent-based disk manager was implemented by means of the raw device interface to circumvent shortcomings of the UNIX file system. The transaction notion was supported via the strict two-phase locking method with multiple granularity and a hybrid recovery scheme. The overall system architecture of MIDAS is presented. Some major modules in MIDAS are described.< >

关键词： Relational databases Transaction databases computer science Concurrency control Government Concurrent computing Application software Packaging machines Information systems

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A look at scalable dense linear algebra libraries

A look at scalable dense linear algebra libraries

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Scalable High Performance Computing Conference

作者： J. Dongarra R. van de Geijn D. Walker Department of Computer Science University of Tennessee USA Mathematical Sciences Section Oak Ridge National Laboratory USA Department of Computer Sciences University of Technology Austin TX USA Mathematical Sciences Section Oak Ridge National Laboratory Oak Ridge TN USA

Discusses the essential design features of a library of scalable software for performing dense linear algebra computations on distributed memory concurrent computers. The square block scattered decomposition is proposed as a flexible and general-purpose way of decomposing most, if not all, dense matrix problems. An object-oriented interface to the library permits more portable applications to be written, and is easy to learn and use, since details of the parallel implementation are hidden from the user. Experiments on the Intel Touchstone Delta system with a prototype code that uses the square block scattered decomposition to perform LU factorization are presented and analyzed. It was found that the code was both scalable and efficient, performing at about 14 GFLOPS (double precision) for the largest problem considered.< >

关键词： Linear algebra Software libraries Concurrent computing Distributed computing Scattering Software performance Matrix decomposition Application software Prototypes Performance analysis

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Enforcement of integrity constraints against transactions with transition axioms

Enforcement of integrity constraints against transactions wi...

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IEEE Annual International computer Software and Applications Conference (COMPSAC)

作者： S.H. Lee L.J. Henschen M.H. Kim Y.-J. Lee Database Section Electronics and Telecommunications Research Institute South Korea Department of Electrical Engineering and Computer Science Northwestern University IL USA Department of CS and Center for AI Research Korea Advanced Institute of Science and Technology South Korea

The authors address an enforcement technique of integrity constraints against transaction updates in a relational database system. Transition axioms have been used effectively in checking integrity constraints for single update statements. The authors extend the idea of transition axioms to a transaction which is a sequence of read and update statements. Integrity constraints in this scheme are simplified without database access before the actual operations are performed avoiding the need to undo an illegal transaction. Transaction partitioning, which can reduce the overhead of checking integrity constraints significantly, is proposed. Partitioning a transaction becomes crucial when a transaction is associated with multiple integrity constraints.< >

关键词： Transaction databases Relational databases Database systems computer science Artificial intelligence Control systems Law Legal factors

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COMPARISON OF DOWNHOLE AND SURFACE SAMPLING FOR THE DETERMINATION OF VOLATILE ORGANIC-COMPOUNDS (VOCS) IN GROUND-WATER

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GROUND WATER MONITORING AND REMEDIATION 1992年第1期12卷 126-133页

作者： ROSEN, ME PANKOW, JF GIBS, J IMBRIGIOTTA, TE Michael E. Rosen received his B.A. in chemistry from the State University of New York at Binghamton in 1981 and a Ph.D. in environmental science and engineering from the Oregon Graduate Institute in 1988. His research interests include trace environmental analysis of organic compounds. He is now manager of the Voluntary Cleanup Section of the Oregon Department of Environmental Quality (Environmental Cleanup Division 811 S.W. 6th Ave. Portland OR 97204) where he is working to develop streamlined procedures and processes for the investigation and cleanup of hazardous substance sites. James F. Pankow is professor and chairman of the Department of Environmental Science and Engineering at the Oregon Graduate Institute (Oregon Graduate Institute of Science and Technology Department of Environmental Science and Engineering 19600 N.W. von Neumann Dr. Beaverton OR 97006–1999). He received his B.A. in chemistry in 1973 from the State University of New York in Binghamton and his Ph.D. in environmental engineering science from the California Institute of Technology in Pasadena California in 1979. His group is involved in the study of the physical and chemical processes affecting the behavior of organic and inorganic chemicals in the environment. This work includes the development and application of sensitive analytical methods for the determination of trace organic contaminants in ground water systems. Jacob Gibs is an environmental engineer with the U.S. Geological Survey Water Resources Division (810 Bear Tavern Rd. Ste. 207 West Trenton NJ 08628). He received a B.S. in mechanical engineering in 1968 an M.S. in environmental engineering in 1975 and a Ph.D. in environmental engineering in 1983 all from Drexel University Philadelphia Pennsylvania. He is currently project chief of a study on representative sampling of ground water for trace levels of organic compounds. His research interests include evaluating ground water sampling techniques and devices for purgeable organic compounds design of sampling

The relative precision and accuracy of sampling and analysis methods for the determination of trace concentrations of volatile organic compounds (VOCs) in ground water were compared. Samples were collected from a well containing nanogram-per-liter (ng/L) to microgram-per-liter (mu-g/L) levels of VOCs. A Keck helical rotor submersible pump was used to collect samples at the surface for analysis by purge and trap (P&T) and for analysis by adsorption/thermal desorption (ATD). Downhole samples were collected by passing water through an ATD cartridge. Although slight spontaneous bubble outgassing occurred when the water was brought to the surface, the relative precisions and comparabilities of the surface and downhole methods were generally found to be equivalent from a statistical point of view. A main conclusion of this study is that bringing sample water to the surface for placement in VOC vials (and subsequent analysis by P&T) can be done reliably under many circumstances. However, care must still be taken to prevent adsorption losses and cross contamination. Samples subject to strong bubble outgassing will need to be handled in a special fashion (e.g., by downhole ATD) to minimize volatilization losses. Additionally, the higher sensitivity of the ATD method allows lower detection limits than are possible with P&T. For example, several compounds present at the ng/L level could be determined with confidence by ATD, but not by P&T.

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Simulation of electromagnetic radiation and scattering using a finite difference-time domain technique

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computer Applications in Engineering Education 1992年第1期1卷 45-45页

作者： Li, K. Tassoudji, M.A. Shin, R.T. Kong, J.A. Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 Kevin Li:received his BS and SM degrees (1990) in Electrical Engineering and EE (Electrical Engineer's) degree (1991) from the Massachusetts Institute of Technology where he is currently pursuing his PhD in Electrical Engineering. Since 1990 he has been the recipient of a United States Air Force Laboratory Graduate Fellowship. His main research interests include electromagnetic scattering radar cross section prediction and numerical techniques. Mr. Li is a member of Tau Beta Pi and a student member of IEEE. M. Ali Tassoudji:received his BS (1987) and MS (1989) degrees in Electrical Engineering from the University of Michigan Ann Arbor. Since 1989 he has been a research assistant at the Massachusetts Institute of Technology where he is currently working towards his PhD in Electrical Engineering. His research interests include electromagnetic scattering and propagation modeling of microwave circuits and numerical techniques. Mr. Tassoudji is a member of IEEE and Eta Kappa Nu. Robert T. Shin:received his SB (1977) SM (1980) and PhD (1984) in Electrical Engineering from the Massachusetts Institute of Technology. Since 1984 he has been a member of the Air Defense Techniques Group at MIT Lincoln Laboratory as a Research Staff member and as a Senior Staff member from 1989. His research interests are in the areas of electromagnetic wave scattering and propagation theoretical model development and data interpretation for microwave remote sensing. He is the coauthor ofTheory of Microwave Remote Sensing(Wiley 1985). Dr. Shin is a member of The Electromagnetics Academy IEEE American Geophysical Union Tau Beta Pi Eta Kappa Nu and Commission F of the International Union of Radio Science. Since 1987 he has served on the Editorial Board of theJournal of Electromagnetic Waves and Applications(JEWA). Jin Au Kong:is Professor of Electrical Enginee

The finite difference-time domain (FD-TD) technique is applied to the solution of Maxwell's equations. A computer program, which can be used to simulate and study numerous electromagnetic phenomena, is developed and implemented on an IBM 386 compatible personal computer. The FD-TD technique is a useful tool for students in electromagnetics. The technique is flexible and can be applied to many basic EM scattering and radiation problems. Because field solutions are found as a function of time, visualization of the propagation of the EM fields is possible. The FD-TD technique is implemented for a two-dimensional rectangular grid in conjunction with a second-order absorbing boundary condition. Both E- and H-field polarizations are analyzed. Finite objects consisting of dielectric, magnetic and conducting materials, and perfectly conducting infinite ground planes are modeled. Plane wave and line current sources are implemented. In addition to the capability of animating the propagation of the EM fields, radiation and scattering patterns can be generated.

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CAD CAM GOES TO SEA - THE SAAR-5 DESIGN AND CONSTRUCTION

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NAVAL ENGINEERS JOURNAL 1992年第3期104卷 148-155页

作者： LINDGREN, JR SOLITARIO, WA MOORE, AP STREIFF, MA John R. Lindgren Jr:. is vice president for engineering at Ingalls Shipbuilding Inc. a Division of Litton Industries in Pascagoula Miss. He joined Ingalls in 1958 and has held various positions in the Engineering Division and participated in the design of numerous merchant ships drill rigs submarines and surface combatants and auxiliary support ships. Mr. Lindgren is a 1958 graduate of the University of Southwest Louisiana. His degree is in mechanical engineering and he is also a licensed professional engineer. William A. Solitario:is the director of advanced technology at Ingalls Shipbuilding Inc. in Pascagoula Miss. He received his B.S. degree in chemical engineering from the City University of New York and has 28 years experience in marine engineering and design. His current responsibilities include the direction of Ingalls' IRAD programs and several Navy-funded R&D programs to improve ship's performance and reduce ship's operating costs. He is a member of the Society of Naval Architects and Marine Engineers and past chairman of the Gulf Section East Area. Arnold P. Moore:is the director design engineering at Ingalls Shipbuilding where he is responsible for all new construction design and engineering activities. Prior to promotion to his current position Mr. Moore served as chief naval architect at Ingalls. He has 24 years experience in ship design construction and repair. Mr. Moore holds the professional degree of ocean engineer as well as a master's degree in naval architecture and marine engineering from MIT. He also earned a bachelor's degree in naval science from the U.S. Naval Academy and is a registered professional engineer. Mr. Moore served as an engineering duty officer in the U.S. Navy and is currently a captain in the Naval Reserve. He is a past chairman of the Gulf Section of the Society of Naval Architects and Marine Engineers and a member of the American Society of Naval Engineers and Sigma Xi. Michel A. Streiff:is the manager of CAD/CAM applications at Ingalls Shipbuilding Inc. His

The SA'AR-5 Corvette Program is the first major warship construction to be entirely accomplished using a 3-dimensional, interference checked computer based design. This paper discusses the organization and approach used to create the design models which form the basis for interference checking as well as the source of extracted production data. The design or product model is the nucleus of the computer data base that defines the configuration of the entire ship. The data base includes geometry, weight, and material, as well as production control data. The ability of the computer to link such diverse information is the key to maintaining configuration control during the course of the design and construction. The ease with which formatted manufacturing data (both N.C. fabrication and installation) can be extracted enables the preparation of detailed packages containing the desired geometry as well as the associated material and sequencing data, thus assuring the producibility of the design. The SA'AR-5 design is CAD/CAM's state of the art in U.S. shipbuilding.

关键词： Warships

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