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computers in Cardiology (CinC)

作者： H. Jadvar J. Jenkins R. Arzbaecher Bioengineering Program and Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Pritzker Institute of Medical Engineering IIT Center Chicago IL USA

Transesophageal atrial pacing (TAP) has been proposed as a noninvasive alternate modality of cardiac stress for patients who cannot perform an adequate exercise stress test. Present computer methods for processing the exercise ECG are inadequate in analyzing the unique surface ECG recorded during a TAP stress procedure. This is due to the presence of large simulator-induced pacing artifacts which confound computer beat identification. The authors have developed hardware to suppress the large pacing artifact, and a software method to detect the R wave, determine sustained capture, and calculate beat-by-beat and average ST-segment level, St slope, R-wave amplitude, and instantaneous RR interval and heart rate. They employ five different computer methods (single-point, average, weighted-average, linear least-squares and parabolic least-squares) in ST-segment measurements. They demonstrate the deficiency of present exercise ECG computer methods in processing the ECG during stress and show the significantly enhanced performance of their own technique on real ECG data.< >

关键词： Stress measurement Electrocardiography Heart rate Biomedical engineering Performance evaluation Hardware Heart rate detection Testing Electronic circuits Frequency

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A conference key distribution system based on the Lagrange interpolating polynomial

A conference key distribution system based on the Lagrange i...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： E.-H. Lu W.-Y. Hwang L. Harn J.-Y. Lee Department of Electrical Engineering National Cheng Kung University Tainan Taiwan Computer Science Program University of Missouri Kansas City Kansas City MO USA

A conference key distribution system (CKDS) can provide a common secret communication key to a set of M stations. A CKDS based on Lagrange interpolating polynomial is introduced. It is easy to see that breaking this system is equivalent to break the Diffie-Hellman public-key distribution system. This conference key is selected by the conference chairstation and hidden in the Lagrange interpolating polynomial. Recovering this key by each participating station only requires M-1 multiplications and M-2 additions over a finite field GF(P).< >

关键词： Lagrangian functions Polynomials Cryptography Public key computer science Cities and towns Galois fields electrical resistance measurement

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Infornation Modeling and Analysis of Event Related Potentials

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IEEE Transactions on Biomedical engineering 1987年第12期BME-34卷 928-937页

作者： William J. Williams Howard Shevrin Robert E. Marshall Electrical Engineering and Computer Science Department and the Bioengineering Program University of Michigan Ann Arbor MI USA Department of Psychiatry and Psychology University of Michigan Ann Arbor MI USA Department of Neurology University of Michigan Ann Arbor MI USA

An approach to the analysis of event related potentials (ERP) based on information theory is described. The amount of information in cortical potentials evoked by words briefly presented by tachistoscope is measured by a transinformation method. The inputs to the communication channel are four word categories. One category is composed of pleasant words, another of unpleasant words, both drawn from the Osgood semantic differential research, and two categories are composed of word stimuli related to a psychiatric patient's complaints. The patients chosen for study exhibit either phobias or pathological grief reactions. The method allows ERP's to be mapped into transinformation profiles that reveal time intervals during the poststimulus ERP favorable to the transmission of information concerning the word category presented. The transinformation model results for actual and synthetic data are discussed.

关键词： Enterprise resource planning Mutual information Psychology Voltage Information analysis Information theory Communication channels Pathology Biomedical engineering Psychiatry

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An automated medical record system for a skilled nursing facility

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Journal of Medical Systems 1987年第5期11卷 367-380页

作者： Weiler, Philip G. Thorpe, Linda Walters, Richard Chiriboga, David From the Department of Community Health Center for Aging and Health United States the Department of Electrical and Computer Engineering Division of Computer Science University of California Davis United States D-M Information Systems Inc. United States the Clinical Gerontology Program School of Allied Health Sciences University of Texas United States

This paper reports on the development of an on-line automated medical record system suitable for nursing homes. The software was written in standard MUMPS (Massachusetts General Hospital Utilities Multi-programming System) and is easy for the first-time user to operate. The data managed by the system may be divided into four major components, including text tables, the hierarchical problem dictionary, the patient admission data, and the care plan data. The system met all of the project's objectives and has been enthusiastically received by the nursing home staff. © 1987 Plenum Publishing Corporation.

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Deadlock detection algorithms in distributed database systems 2

Deadlock detection algorithms in distributed database system...

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2nd IEEE International Conference on Data engineering, COMPDEC 1986

作者： Elmagarmid, Ahmed K. Sheth, Amit P. Liu, Hing T. Computer Engineering Program Department of Electrical Engineering Penn. State Univ. United States Honeywell Computer Science Center Golden ValleyMN United States Department of Computer and Information Science Ohio State University United States

In this paper, a centralized deadlock detection algorithm with multiple outstanding requests (CDDMOR) is proposed for use in distributed database systems and transaction-processing systems. This algorithm allows a process to request many resources simultaneously. While a centralized scheme is superior to a completely distributed scheme in terms of performance, a major problem of such a scheme is congestion. Therefore, an important extension to the basic CDDMOR, a partially distributed scheme, is proposed to alleviate the problem of congestion, as well as to take advantage of the result presented by several researchers that global (multisite) deadlocks are infrequent. It takes care of the local (single site) deadlocks without involving other sites and uses centralized deadlock detection only when there is a possibility of global deadlock. © 1986 IEEE.

关键词： Distributed database systems

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Deadlock detection algorithms in distributed database systems

Deadlock detection algorithms in distributed database system...

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International Conference on Data engineering

作者： Ahmed K. Elmagarmid Amit P. Sheth Hing T. Liu Computer Engineering Program Department of Electrical Engineering Penn. State Univ. Honeywell Computer Science Center Golden Valley MN Computer Engineering Program Department of Electrical Engineering Penn. State Univ Department of Computer & Information Science The Ohio State University

关键词： System recovery Detection algorithms Resource management Database systems computers Image edge detection

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AIR-CUSHION LANDING CRAFT NAVIGATION

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NAVAL ENGINEERS JOURNAL 1985年第4期97卷 248-260页

作者： GRAHAM, HR KIM, JC BAND, EGU FOWLER, AW Herbert R. Graham:received his degrees of B.S. in 1951 and M.S. in 1958 in aeronautical engineering from the Massachusetts Institute of Technology and the California Institute of Technology respectively. He also attended the Harvard Graduate School of Business Administration. He is presently a task manager at TRW Inc. McLean Virginia responsible for landing craft air cushion (LCAC) engineering support. Since joining TRW in 1967 he has had several technical project management and system engineering responsibilities in amphibious ships transportation and energy. He was responsible for the preliminary engineering design and cost estimates for tracked air cushion vehicles (TACVs). He has been active in several professional societies including ASNE and served as vice-chairman Los Angeles Section American Institute of Aeronautics and Astronautics. John C. Kim:received his degrees of B.S. in electrical engineering Tri-State University 1959 M.S. in electrical engineering Michigan State University 1960 and Ph.D. in electrical engineering Michigan State University. He is presently a senior staff engineer with TRW Inc. McLean Virginia where his technical experience has included communications system engineering and navigation system analysis. Since joining TRW in 1969 he has held numerous positions including section head project manager and department manager. His previous employment includes E-Systems/Melpar Division and Honeywell. Dr. Kim has been active in the IEEE Washington Chapter activities which included secretary vice-chairman and chairman of Systems Science and Cybernetics Group. Edward G.U. Band:received a B.S. degree in mechnical engineering in 1946 and a D.I.C in aeronautical engineering in 1947 at the City and Guilds College of London University. In 1951 he received an M.S. degree from Stevens Institute of Technology in fluid dynamics. After a career in the aircraft industry in England Canada and the U.S.A. he spent several years teaching in Chile and at Webb Institute of Naval Archi

Air cushion vehicles (ACVs) have operated successfully on commercial routes for about twenty years. The routes are normally quite short; the craft are equipped with radar and radio navigation aids and maintain continuous contact with their terminals. Navigation of these craft, therefore, does not present any unusual difficulty. The introduction of air cushion vehicles into military service, however, can present a very different picture, especially when external navigation aids are not available and the craft must navigate by dead reckoning. This paper considers the problems involved when navigating a high-speed air cushion vehicle by dead reckoning in conditions of poor visibility. A method is presented to assess the ACV's navigational capability under these circumstances. A figure of merit is used to determine the sensitivity of factors which affect navigation such as the range of visibility, point-to-point distance, speed, turning radius and accuracy of onboard equipment. The method provides simplistic but adequate answers and can be used effectively to compare the-capability and cost of alternative navigation concepts.

关键词： AIR CUSHION VEHICLES

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AN ADVANCED METHODOLOGY FOR PRELIMINARY HULL FORM DEVELOPMENT

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NAVAL ENGINEERS JOURNAL 1984年第4期96卷 147-161页

作者： LIN, WC DAY, WG HOUGH, JJ KEANE, RG WALDEN, DA KOH, IY Wen-Chin Lin:heads the Ship Powering Division at the David Taylor Naval Ship R&D Center (DTNSRDC). Dr. Lin received his B.S. degree in mechanical engineering from the National Taiwan University in 1957. He was awarded his M.S. degree in naval architecture and Ph.D. in engineering science from the University of California at Berkeley in 1963 and 1966 respectively. From 1966 to 1969 he was employed by ESSO Research and Engineering Company to conduct marine hydrodynamic research for oil tankers and offshore structures. Since joining DTNSRDC in 1969 he has actively conducted and directed hydrodynamic research to advance naval ship design technology and improve ship performance. Active in national and international symposia on ship hydrodynamic research he is recognized for contributions to the ship research community. For the past six years he has been a member of the Performance Committee of the ITTC and currently serves as secretary of the committee. He is a member of SNAME and the Society of Naval Architects of Japan. William G. Day Jr:. has been employed as a naval architect at the David Taylor Naval Ship R&D Center since receiving a B.E.S. degree from the Johns Hopkins University in 1966. He obtained an M.S. E. degree from George Washington University in 1971. As Head Design Evaluation Branch of the Ship Performance Department he is responsible for model experiments to evaluate the hydrodynamic performance of ships and propulsors. He is a member of ASNE and SNAME. In-Young Koh:received his B.S. and M.S. degrees in electrical engineering from Lowell University in 1969 and 1971 respectively and his Ph.D. in applied mechanics from Rensselaer Polytechnic Institute in 1976. Dr. Koh joined DTNSRDC as an electronic engineer specializing in the application of advanced instrumentation and computer techniques to ship research and design. He is currently engaged in research and development of active control systems for naval ship applications. Dr. Koh is a member of ASNE SNAME and IEEE. David Andrew Walden:is

A ship design methodology is presented for developing hull forms that attain improved performance in both seakeeping and resistance. Contrary to traditional practice, the methodology starts with developing a seakeeping-optimized hull form without making concessions to other performance considerations, such as resistance. The seakeeping-optimized hull is then modified to improve other performance characteristics without degrading the seakeeping. Presented is a point-design example produced by this methodology. Merits of the methodology and the point design are assessed on the basis of theoretical calculations and model experiments. This methodology is an integral part of the Hull Form Design System (HFDS) being developed for computer-supported naval ship design. The modularized character of HFDS and its application to hull form development are discussed.

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The Need for Dynamic Routing in A Network Spanning Several Time Zones

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IEEE Communications Magazine 1982年第4期20卷 13-17页

作者： Chou, W. Nilsson, A.A. Bragg, A.W. Computer Science and Electrical Engineering Computer Studies Program North Carolina State University Raleigh Department of Electrical Engineerin North Carolina State University Raleigh

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Prevention of task overruns in real-time non-preemptive multiprogramming systems

Prevention of task overruns in real-time non-preemptive mult...

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1980 International Symposium on computer Performance Modelling, Measurement and Evaluation, PERFORMANCE 1980

作者： Kim, K.H. Naghibzadeh, Mahmoud Computer Science Program University of South Florida TampaFL33620 United States Department of Electrical Engineering University of Southern California Los AngelesCA90007 United States

ISBN: (纸本)0897910192

Real-time multiprogramming systems, in which a hardware processor is dynamically assigned to run multiple software processes each designed to control an important device (user), are considered. Each software process executes a task in response to a service request repeatedly coming from the corresponding user. Each service task is associated with a strict deadline, and thus the design problem that we are concerned with is to ensure that the service tasks requested can always be executed within the associated deadlines, i.e., no task overrun occurs. This problem was studied by several investigators for the cases where preemptive scheduling strategies are used. In contrast, very few studies have been conducted for cases of non-preemptive scheduling. In this paper we show that a non-preemptive strategy, called relative urgency non-preemptive (RUNP) strategy, is optimal in the sense that if a system runs without a task overrun under any non-preemptive strategy, it will also run without a task overrun under the RUNP strategy. Then an efficient procedure used at the design time for detecting the possibility of a task overrun in a system using the RUNP strategy is presented. The procedure is useful in designing overrun-free real-time multiprogramming systems that yield high processor utilizations. Some special types of systems using the RUNP strategy for which even simpler detection procedures are available are also discussed. Index words: Real-time multiprogramming, task overrun, non-preemptive scheduling, time critical process, relative urgency. © Proceedings of the 1980 ACM Conference on LISP and Functional programming, LFP 1980. All rights reserved.

关键词： Scheduling

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