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作者： C. S. Henkel M. T. Heath R. J. Plemmons Department of Nuclear Engineering North Carolina State University Raleigh North Carolina Mathematical Sciences Section Oak Ridge National Laboratory Oak Ridge Tennessee Department of Computer Science North Carolina State University Raleigh North Carolina

ISBN: (纸本)9780897912785

Least squares modifications associated with the addition or deletion of data often involve updating or downdating the Cholesky factor of the observation matrix. We describe and compare parallel implementations for the hypercube of three methods for down-dating the Cholesky factor: an orthogonal scheme, a hyperbolic scheme, and a hybrid scheme combining the first two. The computational complexities of these algorithms differ significantly, but the parallel implementations of all three have communication complexity similar to solving triangular systems. In computational tests on an Intel iPSC hypercube, the algorithms performed similarly, suggesting a preference for the orthogonal method based on stability considerations. The methods we describe can be adapted to the parallel computation of general orthogonal factorizations, but our discussion is motivated by applications in signal processing using windowed recursive least squares filtering for near real-time solutions.

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Gaussian beam analysis of boresight error of a radome covered aperture

Gaussian beam analysis of boresight error of a radome covere...

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Antennas and Propagation Society International Symposium

作者： J.J. Maciel L.B. Felsen Missile Systems Division/Radome Section Raytheon Company Bedford MA USA Department of Electrical Engineering and Computer Science Weber Research Institute Polytechnic University Farmingdale NY USA

Arbitrary incident fields can be expressed rigorously in terms of Gaussian elements distributed self-consistently over a discrete lattice in a (configuration)-(spatial wavenumber) phase space. The authors note the results of calculations performed to evaluate the field transmitted from a cosine and sine (nulling) one-dimensional aperture through a cylindrical radome. The Gaussian basis elements used were wide and narrow, tilted and nontilted, with various aperture locations. It was found that summing over the important elements in the phase-space lattice produces the same results in all narrow beam cases. Illustrative results obtained with narrow beams are shown and they confirm the utility of the tracking scheme.< >

关键词： Error analysis Apertures Lattices Optical reflection Contracts Fresnel reflection computer errors Missiles computer science Beams

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The spacecraft encounters of comet Halley

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Eos, Transactions American Geophysical Union 1986年第20期67卷 478-481页

作者： Mendis, D. Asoka Tsurutani, Bruce T. Department of Electrical Engineering and Computer Sciences Center for Space Science University of California San Diego California United States Space Physics and Astrophysics Section Jet Propulsion Laboratory California Institute of Technology Pasadena California United States

During its 30th historically recorded and fourth predicted apparition, Comet Halley (the most famous of comets) was visited by five spacecraft from three space agencies, carrying a total complement of 44 scientific instruments. Since Comet Halley has a retrograde motion around the sun in an orbit that is inclined at 162° to the ecliptic plane, all the encounters were fast flybys around the time that the comet crossed the ecliptic plane on March 10, 1986 (descending node). ©1986. American Geophysical Union. All Rights Reserved.

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Computation of system balancing transformations

Computation of system balancing transformations

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IEEE Conference on Decision and Control

作者： A. J. Laub M. T. Heath C. C. Paige R. C. Ward ECE Department University of California Santa Barbara CA USA Mathematics and Statistics Research Section Engineering Physics and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN USA School of Computer Science McGill University Montreal QUE Canada

An algorithm is presented in this paper for computing state space balancing transformations directly from a state space realization. The algorithm requires no "squaring up." Various algorithmic aspects are discussed in detail. Applications to numerous other closely-related problems are also mentioned. The key idea throughout involves determining a contragredient transformation through computing the singular value decomposition of a certain product of matrices without explicitly forming the product.

关键词： Linear systems Observability Eigenvalues and eigenfunctions Singular value decomposition Control theory State-space methods Time of arrival estimation Vectors Controllability Chromium

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MASTER ORDNANCE REPAIR APPLIED - STANDARD ITEM 009-67

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NAVAL ENGINEERS JOURNAL 1986年第3期98卷 35-42页

作者： STIMSON, WA MARSH, MT UTTICH, RM William A. Stimsonreceived his B.S. degree in mathematics from the University of Texas at El Paso in 1964 and his M.S. degree in engineering from the University of Santa Clara in 1971. He served in the U.S. Army Artillery during the Korean Conflict and subsequently was employed at IBM Huntsville Alabama until 1968 where he worked in the design of automatic control systems of the Saturn vehicle. From 1968 until 1971 he was employed at Ames Research Center Moffett Field in the design of nonlinear control systems for sounding rockets and pencil-shaped spacecraft. Following this Mr. Stimson worked at Hewlett Packard Sunnyvale California as a test engineer in automatic test systems. Since 1973 Mr. Stimson has been employed at the Naval Ship Weapon Systems Engineering Station Port Hueneme. He was a ship qualification trials project supervisor for many years and is now serving as master ordnance repair deputy program manager. Mr. Stimson is a member of the American Society of Naval Engineers and is program chairman of the Channel Islands Section. Cdr. Michael T. Marsh USNreceived a B.S. in mathematics from the University of Nebraska and was commissioned via the NESEP program in 1970. He holds an M.S. in computer science from the U.S. Navy Postgraduate School and an MBA from the State University of New York. Cdr. Marsh has served in the weapons department of USSFrancis Hammond (FF-1067) and of USSJohn S. McCain (DDG-36). He was weapons officer aboard USSSampson (DDG-10). As an engineering duty officer Cdr. Marsh was the technical design officer for PMS-399 at the FFG-7 Class Combat System Test Center from 1978 to 1982. He is presently combat system officer at SupShip Jacksonville and has been active in the MOR program since its inception. Cdr. Marsh is also the vice chairman of the Jacksonville Section of ASNE. LCdr. Richard M. Uttich USNholds B.S. and M.S. degrees in mechanical engineering from Stanford University. He enlisted in the Navy in 1965 serving as an electronics technician aboard USSNereus (A

The 600-ship United States Navy offers private shipyards an unprecedented opportunity for overhaul of surface combatants with complex combat systems. Recognizing the new challenge associated with the overhaul of high technology combat systems in the private sector, the Navy in 1983 established the master ordnance repair (MOR) program. This program, a joint effort of the Naval Sea Systems Command (NAVSEA) and the Shipbuilders Council of America (SCA), was designed to identify and qualify those companies and private shipyards technically capable of managing combat systems work and conducting combat system testing. Standard Item 009–67 describes the role of the MOR company in combat system overhaul. It defines terms that are important to understanding the item itself, and imposes upon the prime contractor an obligation to utilize the MOR subcontractor in a managerial capacity. Specific tasks are assigned to the MOR company in planning, production, and testing. Finally, this standard item describes to the Navy planner how to estimate the size of the MOR team appropriate to the work package, a feature that will ensure that combat system bids are tailored to a specific availability.

关键词： WARSHIPS

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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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What should a computer‐literate physician know?. How should he or she come to know it?

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Möbius: A Journal for Continuing Education Professionals in Health sciences 1983年第4期3卷 43-52页

作者： Tuttle, Mark S. Mark S. Tuttle M.D.:Mark S. Tuttle is a lecturer in the Computer Science Division of the Dept. of Electrical Engineering and Computer Sciences at the University of California Berkeley and in the Section on Medical Information Science at the University of California San Francisco. His major research interest is in the process of inference especially medical inference. He is also at work on an introductory computer scence text devoted to conceptual foundations.

In spite of the rapid growth and evolution of information technology, it is possible to identify certain core skills, concepts, and powerful ideas that physicians should possess if each of them is to answer, competently and on a continuing basis, the question, “Where, if at all, should information technology be used in my professional activities?” It is argued that these skills and many of the concepts should be acquired experientially (by using computers), that the powerful ideas can be appreciated with time, and that much of this knowledge, particularly that relating to the nature and limits of “symbolization,” will defy rapid obsolescence. For many physicians, the most straight‐forward path to computer literacy begins with exploratory use of a personal computer. Copyright © 1983 The Alliance for Continuing Medical Education, the Society for Academic Continuing Medical Education, and the Council on CME, Association for Hospital Medical Education

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THE U.S. COAST GUARD MULTI‐MISSION CUTTER: COMMAND, DISPLAY, & CONTROL (COMDAC)

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Naval Engineers Journal 1980年第5期92卷 59-70页

作者： HALL, JON W. ANDERSON, MICHAEL D. USCG LCdr. Jon W. Hall USCGenlisted in the U.S. Coast Guard in 1960 and subsequently served in a number of High Endurance Cutters as an Electronics Technician. In 1969. LCdr. Hall was commissioned an Ensign. U.S. Coast Guard. upon graduation from the Coast Guard Officer Candidate School Yorktown. Va.His first assignment as a commissioned officer was in theUSCGC Hamiltonas a Deck Watch Officer and Electronics Material Officer. He then served as the High Endurance Cutter Representative for Electronics in the First Coast Guard District. Boston Mass. and later at Coast Guard Headquarters in Washington D.C. In June 1978. he was assigned to the New Construction Section of Electronics Engineering. located in Coast Guard Headquarters. as a 270-foot WMEC Project Officer. Currently he is the Chief. New Cosntruction Section responsible for overseeing the development and installation of the 270-foot WMEC electronics package. LCdr. Hall is a graduate of Wentworth Institute Boston. Mass. and has an associate degree in Electronics Technology. Lt.(j. g.) Michael D. Anderson USCGgraduated from the U.S. Coast Guard Academy. New London Conn. in June 1976. with a Bachelor's degree in Computer Science and Electrical Engineering. He served in theUSCGC Madronaas Deck Watch Officer. Communications Officer and Electronics Officer. In August 1977 he was assigned to the Electronics Engineering Division U.S. Coast Guard Headquarters. and until October 1978 held the Type Desk for Electronics Installations in Coast Guard Buoy Tenders Tugs and River Tenders. He is presently assigned to the Software Section. Electronics Engineering Division which is responsible for the procurement of the operational software for the 270-foot WMEC. Lt.(j. g.) Anderson currently is pursuing his Master's degree in Computer Science at The George Washington University.

The U.S. Coast Guard has undertaken a ship construction program to replace Cutters which are nearing 30 to 40 years of service. These replacement ships, classed as the 270‐foot Medium Endurance Cutters (MEC), are intended for multi mission roles to satisfy both Coast Guard and Navy requirements. To achieve the multi mission posture, and to realize a minimal manning level, an automated approach to employ the principles of a command, communication, and control system was Selected. Since the design limitations (size and weight) for the 270‐foot WMEC were stringent, the Coast Guard designed a Command, Display, and Control System (COMDAC) which incorporated the features of previous automation efforts by the U.S. Coast Guard and Navy. COMDAC's uniqueness lies in its ability to receive data, to process and format it in accordance with predetermined doctrine (Navy and Coast Guard), and then to display it at any of several locations. The use of COMDAC provides for the reduction of Plotters and Status Board Keepers and also allows for the NTDS interface to accomplish the various Navy missions. This paper will address COMDAC's utilization as a command, communication, and control system as applied to the Coast Guard and Navy missions. © 1980 American Society of Naval Engineers

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DEVELOPMENT OF GAS TURBINE PERFORMANCE SEEKING LOGIC.

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J Eng Power Trans ASME 1978年第4期100卷 571-575页

作者： Jordan, D. Electrical Engineering and Computer Science Department University of Connecticut Storrs Conn. Advanced Computer Applications Section United Technologies Research Center East Hartford Conn.

Paper No. 78-GT-13.

关键词： AIRCRAFT ENGINES, JET AND TURBINE

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Closure to “Discussion of ‘Development of Gas Turbine Performance Seeking Logic’” (1978, ASME J. Eng. Power, 100, p. 575)

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Journal of engineering for Gas Turbines and Power 1978年第4期100卷 575页

作者： Jordan, D. Michael, G. J. Electrical Engineering and Computer Science Department University of Connecticut Storrs Conn. Advanced Computer Applications Section United Technologies Research Center East Hartford Conn.

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