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Emulation facility for data-driven real-time multi-processing 2nd

2nd International Symposium on High Performance Computing, ISHPC 1999

作者： Urata, Takuji Nishikawa, Hiroaki University of Tsukuba Doctoral Program in Engineering Tsukuba Science City Ibaraki305-8573 Japan University of Tsukuba Institute of Information Sciences and Electronics Tsukuba Science CityIbaraki305-8573 Japan

ISBN: (纸本)3540659692

Minimizing overhead resulting from context switching is a prerequisite for effective real-time multi-processing. Our heterogeneous data-driven processor has shown its multi-processing capability without extending turn-around time of any process as long as enough processing resource is available. However, the heterogeneous multi-processor system connected by a non-uniform network can yield bottlenecks that prevent it from meeting performance requirements unless program allocation is optimized during preprocessing. To avoid overload at the bottlenecks, we need a prototyping scheme to verify each processor's load. This paper discusses an emulation facility for an elastic pipeline structure. To effective emulate our data-driven processor, fine-grained parallel processing is required because the elastic pipeline structure makes up an autonomous processor without a centralized clock. By testing our data-driven processor used as an emulation facility to emulate fine-grained pipeline parallelism, we show its effectiveness. © 1999, Springer-Verlag. All rights reserved.

关键词： Pipelines

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A new estimation formula for minimum filter length of optimum FIR digital filters

A new estimation formula for minimum filter length of optimu...

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International Conference on Signal Processing Proceedings (ICSP)

作者： K. Ichige M. Iwaki R. Ishii Doctoral Program in Engineering University of Tsukuba Tsukuba Ibaraki Japan Japan Advanced Institute of Science and Technology Tatsunokuchi Ishikawa Japan Division of Electrical and Computer Engineering Yokohama National University Yokohama Japan

This paper presents an accurate estimation formula for the minimum filter length of optimum (the minimax criterion-based) FIR low-pass digital filters. The authors have proposed an accurate estimation formula for the particular case that the passband and stopband ripples are identical. Now we expand the formula for the general case. The accuracy of the proposed formula is evaluated in comparison with that of the conventional formulae. We also describe how to apply the proposed formula for the design of other types of filters.

关键词： Digital filters Finite impulse response filter Low pass filters Design optimization Algorithm design and analysis Iterative algorithms Passband Cutoff frequency Minimax techniques Iterative methods

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A New Estimation Formula for Minimum Filter Length of Optimum FIR Digital Filters

A New Estimation Formula for Minimum Filter Length of Optimu...

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1998 Fourth International Conference Signal Processing

作者： Koichi Ichige Mamoru Iwaki Rokuya Ishii Doctoral Program in Engineering University of TsukubaTsukubaIbaraki 305-8573Japan Japan Advanced Institute of Science and Technology TatsunokuchiIshikawa 923-1292Japan Division of Electrical and Computer Engineering Yokohama National UniversityYokohama 240-8501Japan

This paper presents an accurate estimation formula for the minimum filter length of optimum(the minimax criterion based) FIR low-pass digital *** authors have proposed an accurate estimation formula for the particular case that the passband and stopband ripples are *** we expand the formula for the general *** accuracy of the proposed formula is evaluated in comparison with that of the conventional *** is also described how to apply the proposed formula for the design of other types of filters.

关键词： FIR A New Estimation Formula for Minimum Filter Length of Optimum FIR Digital Filters Filter

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Revealing dynamical systems and their bifurcation structure hidden by dynamical noise

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Electronics and Communications in Japan (Part III: Fundamental Electronic science) 1998年第11期80卷

作者： Toshiyuki Tega Ryuji Tokunaga Shihoko Kajiwara Takashi Matsumoto College of Information Science Third Cluster University of Tsukuba Tsukuba Japan 305 Institute of Information Sciences and Electronics University of Tsukuba Tsukuba Japan 305 Doctoral Program in Engineering University of Tsukuba Tsukuba Japan 305 Department of Electrical Engineering Waseda University Tokyo Japan 169

This paper discusses bifurcation diagram reconstruction [1, 2] and shows by a numerical experiment that the correct bifurcation diagram of a dynamical system can be reconstructed from the signal of a chaotic dynamical system perturbed by a sufficiently large dynamical noise. It is also verified that the predictor derived using the proposed method not only can approximate the dynamical rules on the attractor, but also has an excellent global approximation ability on a sufficiently large open set containing the attractor. © 1997 Scripta Technica, Inc. Electron Comm Jpn Pt 3, 80(11): 30–45, 1997

关键词： chaos bifurcation nonlinear prediction bifurcation diagram reconstruction dynamical noise

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Worthwhile, broad and thought-provoking

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science and Public Policy 1997年第4期24卷 282-284页

作者： Bunting, Andrea Russell, Stewart Lecturer in Engineering at RMIT Melbourne and a doctoral student in Science and Technology Studies (STS) University of Wollongong NSW 2522 Australia Senior Lecturer and Head of Program STS

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Empirical testing: The prototyper's evaluation mechanism

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NAVAL ENGINEERS JOURNAL 1997年第1期109卷 41-46页

作者： Hafner, AN Arnold N. Hafner Ph.D.:is founder and president of Information Systems Research (ISR). He has twenty-five years of experience in systems development and is published in the field of systems development management. He served as corporate research scientist at Systems Exploration Inc. from 1988 to 1991 program director at Computer Science Corporation from 1983 to 1988 director of operations at Republic Management Systems Corporation from 1981 to 1983 and program manager at Computer Science Corporation from 1972 to 1981. A 1962 graduate of the US. Naval Academy he holds a doctoral degree in human behavior and engineering degrees in electronics and communications. He has taught courses on information systems and systems management at most of the colleges in the San Diego area. Dr. Hafner has presented fourteen refereed research papers while publishing sixteen articles and a book A Manager's Guide to Software System Development.

Evaluating complex systems is the subject of this paper, the third in a series investigating prototyping. It provides an interesting and helpful overview of how to evaluate systems prototypes and outlines the iterative stream of developer-user interactions that is replacing older approaches to testing and evaluating new military systems, which promise to reduce the time required to develop and field future military capabilities. Changes to the acquisition process, such as those the paper sketches, will facilitate the nation's rapid transit through its current revolution in military affairs.

关键词： Systems analysis

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Architecting a missile system for navy theater ballistic missile defense

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 373-380页

作者： Patel, A Kjos, K Sasso, F Robinson, S Anant Patel:is senior project engineer for the Standard Missile LEAP Progrma (desgnated SM-X) in the Standard Missile/Vertical Launch System Program Office (PMS 422) of the Navy's Program Executive office for Theater Air Defense (PEO TAD). He is responsbile for the integration and test of the SM-X missile including the third stage rocket motor (TSRM) and the kinetic warhead (KW) assemblies. He received his bachelor of science in electrical engineering from the University of Pittsburgh in 1985 Prior to joining PMS 422 he was the project engineer for the shipboard targeting system used during the Terrier LEAP technology demonstration program. he was also tht project manager for the installation and integration of the new threat upgrade (NTU) and cooperative engagement capabilities (CEC) aboard USS Kidd (DDG 993) the first ship to receive CEC during its development test phase. Mr. Patel's other assignments as NTU development lead engineer uncluded providing development and technical direction for modifications to the NTU engagement system for Standard Missile II and III/IIIA compability. kathrin Kjos:is the program development team leader for Hughes Missile Systems Company. She worked on the initial flight demonstraction phase of the program integrating the kill vehicle and advanced solid axial stage into the SM2 Block III ER missile and served as co-chair of the System Safety Working Group. She has thirteen years of experience in system engineering. Previous experience includes missile systems engineering for the Advanced Air-to-Air Missile (AAAM) as well as for laser and radar surveillance systems. She has a bachelor of science degree in chemical engineering from the Illinois Institute of Technology a master of science degree in system engineering from the University of Southern California and is currently a doctoral candidate in systems architecting at the University of Southern California. Felix Sasso is a member of technical staff 11 at Hughes Missile System Company. He has three years of experience in op

While most of the theater ballistic missiles (TBM) in threat countries' inventories are of the shorter range SCUD varieties, mid- to long-range versions are currently in development in a number of third world countries. Threat potential exists in the following three battle spaces: endo-atmosphere (0-30 km), high endo-atmosphere (30-70 km) and exo-atmosphere (greater than 70 km). The inherent short range and low speed of endo-atmospheric threats match well with capabilities of SM-2 Block IVA, which equips the Navy with an area defense capability The exo-atmospheric TBMs are longer range and can threaten more targets which may be widely dispersed. Their higher velocities reduce response times dramatically Therefore, exo-atmospheric TBMs create the need for Standard Missile-3 (SM-3), which provides the Navy with theater wide defense capability. Defining its area and theater wide systems as clearly endo-atmospheric and exo-atmospheric systems allows the Navy to use derivatives of the Standard Missile Block IV to take full advantage of the conditions associated with each of these operating zones. Use of an existing missile and ship system baseline also allows use of the existing interface structure to minimize cost. To counter the endo-atmospheric TBMs, the SM-2 BLK TVA upgrades include an advanced imaging infrared (IIR) seeker, an improved fast-reaction auto pilot and a forward looking RE all in the same volume as the existing missile. The highly responsive SM-2 Block IVA missile, complemented with Aegis weapons systems modifications, provides capability against enemy aircraft and cruise missiles, as well as TBMs. Standard Missile-3 (SM-3) replaces the SM-2 Block TV warhead, radar and guidance section with a boosted third stage and an advanced kinetic warhead (KW). Operation in the exo-atmospheric region permits a KW design with autonomous guidance control and divert thrusters for high maneuverability and has the capability of achieving very high interceptor velocities.

关键词： Missiles

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Transient analysis of an advanced static Var compensator using quad-series voltage-source PAM inverters

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ELECTRICAL engineering IN JAPAN 1996年第2期117卷 93-106页

作者： Tominaga, S Fujita, H Akagi, H Okayama University [?]Received his Master's degree in Electrical and Electronic Engineering in 1995 from the Engineering Research Division of the Graduate School Okayama University. He is currently in the doctoral program in system science at the Natural Sciences Research Division of the Graduate School of the same university. He is engaged in research on reactive power compensators.

This paper deals with an advanced static Var compensator (ASVC) using quad-series voltage-source PAM inverters. The ASVC consists of four three-phase voltage-source inverters with a common de capacitor and four three-phase transformers, each primary winding of which is connected in series with each other. Each inverter outputs a square-wave voltage, while the synthesized output voltage of the ASVC has a 24-step wave shape. This results not only in a great reduction of harmonic currents and de voltage ripples but also in fewer switching and snubbing losses. In this paper, transient analysis is performed with the focus on the response of reactive power and the resonance between the de capacitor and ac reactors. Experimental results obtained from a small-rated laboratory model of 10 kVA are also shown to verify analytical results based on the p-q transformation. The analytical results help in the design of system parameters such as the capacity of the de capacitor and feedback gains.

关键词： reactive power compensator voltage-source inverter PAM higher harmonics power system stabilization

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Application of high temperature superconducting wire to magnetostrictive transducers for underwater sonar

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NAVAL ENGINEERS JOURNAL 1997年第1期109卷 31-39页

作者： Joshi, CH Lindberg, JF Clark, AE Dr. Chad H. Joshi:is president of Energen Incorporated an engineering and development firm specializing in cryogenic and electromechanical systems. The research presented here was conducted while he was employed at American Superconductor Coporation where he held both technical and program management positions. While there Dr. Joshi managed the development of several demonstration products including the sonar transducer presented here. He holds M.S. and Sc.D. degreesfrom the Massachusetts Institute of Technology and a B.S. degree from the Worcester Polytechnic Institute. He has worked in several diverse fields including solar energy fluidized bed technology and superconductivity. His work on stochastic analysis of solar insolation was recognized by the ASME and his doctoral research was accorded international recognition for its unique contribution to understanding quenching in superconducting magnets. Dr. Joshi has numerous patents and more than thirty-five technical publications to his credit. He is a registered Professional Engineer in Massachusetts and an active member of ASME and IEEE. He is a co-founder and treasurer of the New England Chapter of the Cryogenics Society of America. He will be listed in Whos Who in the East in 1997. Jan Lindberg:is a physicist in the Transducers and Arrays Division of the Naval Undersea Warfare Center in New London Connecticut. He leads NUWC'S exploratory development efforts for transduction science and currently is spearheading an effort to introduce high-energy density active materials into tactical sonar systems. With the discovery of high temperature superconductivity he saw the potential benefit of integrating several emerging technologies and enticed American Superconductor Corp. to develop a high temperature superconducting transducer which resulted in the March 1993 demonstration of the world's first integrated high temperature superconducting device. Mr. Lindberg's current interests involve design of high power ultrasonic copolymer arrays characterization of

A low-frequency underwater acoustic transducer integrating high-temperature superconducting (HTS) coils and terbium-dysprosium (TbDy) magnetostrictive material was designed, fabricated and tested. This represents a novel application for high-temperature superconductivity and is a first example of an integrated system involving HTS coils cooled by a mechanical cryocooler. It also brings HTS technology together with a novel magnetic materials technology. The I-ITS coils were fabricated using react-and-wind BiSrCaCuO-2223 HTS wires. They produce a peak field of 0.1 Tesla at 50 K. A single-stage, Stirling-cycle cryocooler was used to cool the coils and the TbDy driver to cryogenic temperatures (50-65K). The coils provide an AC magnetic field superimposed on a DC bias field, which produces oscillatory strain within the magnetostrictive rod;this motion is transmitted through a cryostat to two head masses which project sound into the surrounding environment. High power acoustic output can be obtained by operating the transducer at its resonance frequencies of 520 Hz in air and 430 Hz underwater. This development demonstrates that, unlike low temperature superconductors, HTS wires can be considered for AC applications due to the low losses in these superconductors and the higher heat capacities of materials at temperatures above liquid helium.

关键词： Underwater equipment

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Approximation of group delay response of allpass filters using weighted least square method

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC science 1996年第6期79卷 60-69页

作者： Okuda, M Matsuyama, K Ikehara, M Faculty of Science and Technology Keio University Yokohama Japan 223 Mashiro Okuda received his B.E. and M.E. degrees in Electrical Engineering from Keio University in 1993 and 1995 respectively where he is currently in the doctoral program. He is engaged in research on digital signal processing.

Allpass filters with prescribed group-delay response are useful in compensating such response. In general, the approximation of group-delay response is formulated as a nonlinear problem;thus, its approximation becomes difficult. The design methods with nonlinear optimization have the problem that initial values of filter coefficients are needed and heavy computation is required. The design method is simplified in the conventional method where magnitude response is approximated instead of group-delay response, but the approximation error is increased in the indirect methods. This paper proposes a method in which group-delay response is approximated by a linear function and optimal solution is obtained in the least square sense by iteratively solving the linear equations. This method has the merit that the error of group-delay response is directly evaluated. Moreover, applying Lawson's algorithm to this method, an equiripple solution can be obtained and maximum value of error can be decreased.

关键词： group-delay response allpass filter weighted least square method equiripple approximation

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