作者：
Hoshiai, TMemberNTT Network Service Systems Laboratories
Musashino Japan 180 Takashige Hoshai:received his B.S. and M.S. degrees in 1984 and 1986
respectively from Toyohashi Univ. of Tech. where he received his Ph.D. degree. In 1986 he joined NIT Communication Switching Laboratories and is Senior Researcher at IIT Network Service Systems Laboratories. At present he is engaged in research on distributed systems at Bell Communication Lab. (USA). His main interests are real time operating systems computer architecture and distributed systems.
In multiprocessor systems with a common bus arbiter, contention for access to the common bus and shared memory is a major cause of performance degradation. The first-order moment match approximation is an effective te...
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In multiprocessor systems with a common bus arbiter, contention for access to the common bus and shared memory is a major cause of performance degradation. The first-order moment match approximation is an effective technique of performance evaluation in such systems. Comparison with simulation results demonstrates that the first-order moment match technique gives good accuracy. The performance of completely coupled multiprocessor systems is compared with that of bus-arbitrated multiprocessor systems in order to determine the applications for which the latter is best suited.
This paper descirbes how ship weights are estimated. Detail is presented concerning relationships between existing weight data and the characteristics of a new design as it develops from completion of feasibility desi...
This paper descirbes how ship weights are estimated. Detail is presented concerning relationships between existing weight data and the characteristics of a new design as it develops from completion of feasibility design through contract design. Margin requirements are also discussed. The weight estimating ratios and factors presented, while not directly associated with a specific ship type, cover the weight classification groups one would use in the design of a surface combatant. The purpose of this paper is to present the fundamentals of weight estimating to the ship design community. With this knowledge, ship design engineers and managers should be able to personally identify with the important parts they all play in creation of a credible weight estimate.
Since the signing of the Contract Design Plane for the CVN 68 (the U.S. Navy's latest Class of Aircraft Carriers) In 1963, considerable technological advances have been made in Naval Ship Design. This paper provid...
Since the signing of the Contract Design Plane for the CVN 68 (the U.S. Navy's latest Class of Aircraft Carriers) In 1963, considerable technological advances have been made in Naval Ship Design. This paper provides specific examples of how new technology has affected traditional Carrier design practices and techniques, and also indicates areas where future advanced technology will be needed. It is divided into four sections: 1) computer Design Application; 2) Total Ship Energy Conservation Analysis; 3) Advances in Structural Design; and 4) Impact of V/STOL Aircraft. The increased use of the computer to define ship characteristics in the initial stage of ship design is discussed, followed by a report on efforts to include energy conservation as an integral part of the design process. The energy conservation approach uses traditional analytical techniques to develop innovative design configurations that will achieve energy savings. Of the many advances in Carrier structural design, two specific examples are given: 1) Elimination of the infamous “knee-knockers” (high sills in passageway openings) common to Gallery Deck structure, and 2) Successful attempts at reducing the thickness of aircraft elevator platforms. The paper concludes by pointing out some possible challenges facing the ship designer and some of the technology already created by the expected introduction of advanced design Vertical/Short Takeoff and Landing (V/STOL) aircraft.
Parallel Virtual Machine (PVM) and Message Passing Interface (MPI) are the most frequently used tools for programming according to the message passing paradigm, which is considered one of the best ways to develop para...
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ISBN:
(数字)9783540481584
ISBN:
(纸本)9783540665496
Parallel Virtual Machine (PVM) and Message Passing Interface (MPI) are the most frequently used tools for programming according to the message passing paradigm, which is considered one of the best ways to develop parallel applications. This volume comprises 67 revised contributions presented at the Sixth European PVM/MPI Users' Group Meeting, which was held in Barcelona, Spain, 26-29 September 1999. The conference was organized by the computer Science Department of the Universitat Autònoma de Barcelona. This conference has been previously held in Liverpool, UK (1998) and Cracow, Poland (1997). The first three conferences were devoted to PVM and were held at the TU Munich, Germany (1996), ENS Lyon, France (1995), and University of Rome (1994). This conference has become a forum for users and developers of PVM, MPI, and other message passing environments. Interaction between those groups has proved to be very useful for developing new ideas in parallel computing and for applying some of those already existent to new practical fields.
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