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An automated data acquisition and processing system using personal computers for an undergraduate electric machinery laboratory

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IEEE Power engineering Review 1989年第2期9卷 69-69页

作者： Ranade, Satish J. Electric Utility Management Program Department of Electrical and Computer Engineering New Mexico State University Las Cruces NM United States

Over the last several years the power of personal computers (PC) in enhancing teaching effectiveness in both classroom and laboratory has become universally recognized. The objective of this paper is to describe how PC-based systems are used in undergraduate electric machinery laboratory instruction at New Mexico State University (NMSU). Copyright © 1989 by The Institute of electrical and Electronics Engineers, Inc.

关键词： Data acquisition Microcomputers Machinery Laboratories Power system simulation Power engineering and energy Systems engineering and theory Power system measurements Power engineering computing Instruments

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Third-order optical susceptibility in short-period GaAs doping superlattices

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Journal of Applied Physics 1989年第9期66卷 4387-4392页

作者： Choquette, Kent D. McCaughan, Leon Misemer, D.K. Materials Science Program University of Wisconsin Madison WI 53706 United States Electrical and Computer Engineering Department University of Wisconsin Madison WI 53706 United States Basic Technologies/Corporate Research Laboratory 3M Company St. Paul MN 55144 United States

We propose that short-period doping superlattices are suitable for the enhancement of a third-order susceptibility arising from free carriers in nonparabolic energy subbands. The inherent advantage lies in the ability to simply engineer the superlattice potential profile, yielding control of miniband energy dispersion. We consider short-period GaAs doping superlattices composed of uniformly doped donor and acceptor layers, and planar-doped n- and p-type monolayers separated by intrinsic regions. Calculations of the electronic structure of compensated and n-type noncompensated n-i-p-i superlattices incorporating miniband dispersion at nonzero temperature are reported. We show that small modulations of the superlattice potential lead to large subband nonparabolicities and we calculate a twentyfold improvement in the third-order susceptibility over bulk GaAs at room temperature, comparable to that predicted for GaAs/AlGaAs compositional superlattices.

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THE AEGIS DATA BUS EXPERIMENT

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NAVAL ENGINEERS JOURNAL 1989年第5期101卷 53-58页

作者： FRINK, JG VERVEN, DM John G. Frink is an assistant group supervisor in the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He received his B.S. degree in physics from Michigan State University in 1968 and the M.S. degree in computer science from the University of Maryland in 1971. Mr. Frink worked at the Naval Surface Weapons Center White Oak Laboratory on a variety of weapons systems before joining the Applied Physics Laboratory in 1978. Mr. Frink has supervised the development of a large scale battle group simulation that successfully employs the receiver selection paradigm described herein on a hardware suite composed of an extensible number of (currently 15) processors. David M. Verven is a senior electrical engineer in the Fleet Systems Department of The Johns Hopkins University Applied Physics Laboratory. He received the B.S. degree in electrical engineering from the University of Maryland College Park in 1979 and the M. S. degree in the same discipline from The Johns Hopkins University in 1984. Mr. Verven joined the Applied Physics Laboratory in 1979 and initially worked on analysis of Navy sensor systems. In 1981 he was the AN/SPS-49 test team leader for the New Threat Upgrade (NTU) combat system land-based test. In 1982 he became involved in the development of the BBWRS system. Currently he is involved in real-time computer program development for the CEP project.

This paper documents an experiment performed by The Johns Hopkins University Applied Physics Laboratory to measure the effect of inserting a data bus into a combat system. The experiment was conducted at the Aegis computer Center located at the Naval Surface Weapons Center in Dahlgren, Virginia (NSWC/DL). The purpose of the experiment was to determine whether or not the Aegis Weapon System (the core of the Aegis Combat System) could be operated with a portion of its point-to-point interelement cables replaced by a data bus. The data bus chosen for the experiment employs message broadcasting with receiver selection. A primary goal of the experiment was to minimize the amount of Aegis computer program changes required to accommodate the data bus. The results presented in this paper will show that the experiment was a success. Key certification tests were passed with no computer program changes to the tactical elements and minimal changes in the Aegis tactical executive (ATES) program (less than 110 words changed).

关键词： Data Transmission Equipment

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programMER-TRANSPARENT COORDINATION OF RECOVERING CONCURRENT PROCESSES - PHILOSOPHY AND RULES FOR EFFICIENT IMPLEMENTATION

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IEEE TRANSACTIONS ON SOFTWARE engineering 1988年第6期14卷 810-821页

作者： KIM, KH Computer Engineering Program Department of Electrical Engineering University of California CA92717

An approach to coordination of cooperating concurrent processes, each capable of error direction and recovery, is presented. Error detection, rollback, and retry in a process are specified by a well-structured language construct called recovery block. Recovery points of processes must be properly coordinated to prevent a disastrous avalanche of process rollbacks. The approach relies on an intelligent processor system (that runs processes) capable of establishing and discarding the recovery points of interacting processes in a well coordinated manner such that a process never makes two consecutive rollbacks without making a retry between the two, and every process rollback becomes a minimum-distance rollback. Following a discussion of the underlying philosophy of the author's approach, basic rules of reducing storage and time overhead in such a processor system are discussed. Examples are drawn from the systems in which processes communicate through monitors.

关键词： PROCESSOR Philosophy concurrent process RECOVERING MONITOR

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A PERSONAL-computer SOFTWARE PACKAGE FOR POWER engineering-EDUCATION

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IEEE TRANSACTIONS ON POWER SYSTEMS 1988年第4期3卷 1864-1871页

作者： GLOVER, JD Power Systems Program Department of Electrical and Computer Engineering Northeastern University Boston MA USA

The author describes a personal-computer software package recently incorporated in the power engineering program at Northeastern University. The package includes a set of computer programs which can be utilized to support classroom instruction and student design projects. The programs cover matrix operations, symmetrical components, line constant, steady-state operation of transmission lines, power flow (100 buses), symmetrical short circuits (100 buses), short circuits (100 buses), transmission-line transients, and transient stability. The computer programs, the way they are utilized, and initial student reaction are discussed. It is concluded that the availability of the power system analysis and design software package has extended classroom capabilities and enhanced student interest in power engineering courses. The reaction of students to the software has been positive, and it has allowed them to work on more difficult and realistic problems and make it an innovative tool in the learning process.< >

关键词： Microcomputers Software packages Power engineering Power system transients Power engineering computing Transmission line matrix methods Circuits Power system stability Power system analysis computing Packaging

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Tunable model-driven nonuniform sampling methods for 3-D inspection

Tunable model-driven nonuniform sampling methods for 3-D ins...

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Automated Inspection and High-Speed Vision Architectures 1987

作者： Malloch, Charles B. Kwak, William I. Gerhardt, Lester A. Rensselaer Polytechnic Institute Computer Integrated Manufacturing Program Department of Electrical Computer and Systems Engineering TroyNY12180 United States

The development of a CIM (computer Integrated Manufacturing) environment requires that inspection processes be linked to databases containing the design data. Increased emphasis on flexibility must not be bought at the expense of increased human involvement in producing process directives. The RPI CIM program has developed an automated 3-D inspection system which integrates a CAD database to develop preliminary inspection directives. The design of the inspection system is characterized by real-time operation, an ability to utilize 3-D data originating from both a CAD model and from points on a test piece, the automatic generation of inspection programs based on model features, and the system's sensitivity to tolerancing issues. Inspection of manufactured parts and assemblies often requires large amounts of information in the form of test probe point locations and large amounts of time to perform the inspection. By optimally locating the probe points it is possible to maintain inspection reliability using fewer test probes in a reduced amount of time. A class of sampling schemes has been developed which use part model and manufacturing process information to generate an improved probe-point location set for routine inspection in a model-based, open-loop mode. The objective of the proposed sampling scheme is to optimize the placement of the sample points on the ideal model to minimize the chance of missing a discrepancy. The algorithm which generates the inspection program bases its test-point placement on an estimate of the likelihood of a machining discrepancy at any given point on the part surface. Implemented for evaluation in 2-D, the algorithm has been selected for its ability to be extended to 3-D. Test results show that it performs favorably on a large class of surfaces. © 1988 SPIE. All rights reserved.

关键词： Inspection

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Modification operations in data base machines: Where are they? 88

Modification operations in data base machines: Where are the...

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16th ACM Annual Conference on computer Science, CSC 1988

作者： Hurson, A.R. Miller, L.L. Department of Electrical Engineering Computer Engineering Program Pennsylvania State University University ParkPA16802 United States Department of Computer Science Iowa State University AmesIA50011 United States

ISBN: (纸本)0897912608

Advances in technology coupled with the inefficiency of the conventional von-Neumann type architecture in handling database systems have motivated the design and implementation of the so called database machines. Unfortunately, a majority of the proposed database machines have neglected to address proper procedures for modification operations. This negligence is partially due to the complexity of the operations and low performance of the database architectures in handling modification operations. First, the implementation of the modification operations in some database machines is overviewed. Second, we will address the mechanisms in which the relational database machine ASLM handles the modification operations. Finally, our approach is compared against the other proposed approaches in the literature. © 1988 ACM.

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High computation performance through efficient access of data structures

High computation performance through efficient access of dat...

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： P.T. Hulina L.D. Coraor O.A. Morean Computer Engineering Program Department of Electrical Engineering Pennsylvania State University USA

The authors propose the use of an access coprocessor (AP) to reduce the adverse effects of the access overhead on the performance of a VLSI processor. The AP offers the possibility of achieving substantial speedup in program execution time by means of concurrency in the access and execute processes, and by the use of special operations to perform efficiently address calculations. System operation is illustrated by means of a matrix multiplication algorithm. A preliminary analysis of the performance of a VLSI processor, with and without the AP, is presented.< >

关键词： High performance computing Data structures Coprocessors Very large scale integration Memory management Data processing computer languages High level languages Concurrent computing System performance

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A VLSI join module

A VLSI join module

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： A.R. Hurson C.R. Petrie J.B. Cheng Computer Engineering Program. Department of Electrical Engineering Pennsylvania State University USA

Some of the previously proposed join operation implementations in several database machines are briefly analyzed. An associative parallel join module and its O(n) associative parallel algorithm are proposed. A VLSI ch... 详细信息

关键词： Very large scale integration Database machines Relational databases Spatial databases Parallel algorithms Application software Hardware Data engineering Design engineering Data security

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Designing fault tolerance capabilities into real-time distributed computer systems

Designing fault tolerance capabilities into real-time distri...

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IEEE Workshop on Future Trends of Distributed Computing Systems

作者： K.H. Kim Computer Engineering Program Department of Electrical Engineering University of California Irvine CA USA

Some of the fault-tolerance schemes that have been established as promising ones for use in real-time distributed computer systems (DCSs) are reviewed. Major issues that remain to be resolved in the 1990s are also discussed. By and large, the design of fault-tolerant real-time DCSs is an immature field. Many of the promising fault tolerance schemes have not been adequately evaluated. It is hoped that many more testbed-based efforts will be made in the field of fault-tolerant real-time distributed computing.< >

关键词： Fault tolerant systems Real time systems Distributed computing Fault tolerance Design engineering Application software Distributed control Control systems Fault diagnosis Navigation

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