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Revealing dynamical systems and their bifurcation structure hidden by dynamical noise

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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Petroleum hydrocarbon bioventing kinetics determined in soil core, microcosm and tubing cluster studies

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GROUND WATER MONITORING AND REMEDIATION 1996年第1期16卷 141-153页

作者： Moyer, EE Ostendorf, DW Richards, RJ Goodwin, S Ellen E. Moyer (ENSR Consulting and Engineering 35 Nagog Park Acton MA 01720) is a senior environmental engineer at ENSR Consulting and Engineering in Acton Massachusetts. Her research interests include bioremediation air sparging soil venting and analytical modeling of subsurface contamination. Dr. Moyer is a registered professional engineer with an M.S. in environmental engineering and a Ph.D. in civil engineering from the University of Massachusetts at Amherst and is a member of the National Ground Water Association (NGWA) and the American Society of Civil Engineers. David W. Ostendorf (Civil Engineering Department University of Massachusetts Amherst MA 01003) is an associate professor in the Environmental Engineering Program of the Civil Engineering Department of the University of Massachusetts at Amherst. His research interests include unconfined aquifer contamination hazardous waste site remediation and analytical modeling of problems in environmental fluid mechanics. Dr. Ostendorf is a registered professional engineer and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation Association of Environmental Engineering Professors and NGWA. Robin J. Richards (Department of Microbiology University of Massachusetts Amherst MA 01003) is a doctoral student in microbiology at the University of Massachusetts at Amherst. Her research interests include synthesis and biodegradation of microbially produced polymers as well as bioremediation of petroleum contamination in soil and ground water. She has a B.S. in civil engineering from City College of New York and an M.S. in environmental engineering from the University of Massachusetts at Amherst. Steve Goodwin (Microbiology Department University of Massachusetts Amherst MA 01003) is an associate professor in the Department of Microbiology of the University of Massachusetts at Amherst. His research interests include microbial ecology anaerobic digestion and

Aerobic biodegradation of vapor-phase petroleum hydrocarbons was evaluated in an intact soil core from the site of an aviation gasoline release. An unsaturated zone soil core was subjected to a flow of nitrogen gas, oxygen, water vapor and vapor-phase hydrocarbons in a configuration analogous to a biofilter or an in situ bioventing or sparging situation. The vertical profiles of vapor-phase hydrocarbon concentration in the soil core were determined by gas chromatography of vapor samples. Biodegradation reduced low influent hydrocarbon concentrations by 45 to 92 percent over a 0.6-m interval of an intact soil core. The estimated total hydrocarbon concentration was reduced by 75 percent from 26 to 7 parts per million. Steady-state concentrations were input to a simple analytical model balancing advection and first-order biodegradation of hydrocarbons. First-order rate constants for the major hydrocarbon compounds were used to calibrate the model to the concentration profiles. Rate constants for the seven individual hydrocarbon compounds varied by a factor of 4. Compounds with lower molecular weights, fewer methyl groups, and no quaternary carbons tended to have higher rate constants. the fist-order rate constants were consistent with kinetic parameters determined from both microcosm and tubing cluster studies at the field site.

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The figure source equation and its physical consideration

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SYSTEMS AND COMPUTERS IN JAPAN 1996年第9期27卷 83-93页

作者： Aoki, Y Iijima, T Member Japan Advanced Institute of Science and Technology Hokuriku Ishikawa Japan 923 Yasubim Aoki:graduated from the University of Kanazawa Faculty of Engineering Department of Electrical Engineering and Information Science in 1992 and received his Master's degree in 1994 from the Japan Advanced Institute of Science and Technology Hokuriku Department of Information Science where he is currently in the doctoral program engaged in research on pattern recognition. Honorary Member Taizo lijima:graduatedwith a B.E. degree from the Tokyo Institute of Technology in 1948 and received his Ph.D. degree later. He joined the Electro-Technical Laboratories in 1948 and since then has been involved in research on electromagnetic theory and pattern recognition theory image processing voice recognition and research and development of OCR. After serving as the head of Iijima Special Research Laboratories he became Professor at the Tokyo Institute of Technology in 1986. He because Professor Emeritus of that institute in 1986. He became Professor at Tokyo Engineering University and Professor Emeritus there in 1991. In 1991 he became Professor at the Japan Advanced Institute of Science and Technology and was appointed Vice President of the institute in 1992. He served successively as editor examiner secretary of general affairs inspector counsel committee-head of pattern recognition and specialized studies head of Tokyo chapter and vice president of this institute. In 1991 he became Honorary Member. He received the Paper Award from the Institute four times and the Literary Works Award once. He received the Achievement Award and the Distinguished Service Award in 1976 and 1989 respectively. He received the Purple Ribbon Medal from the Emperor in 1989.

Theoretical studies on Iijima's ''Theory of Pattern Recognition,'' which is known as a method of multiple similarity, have shown clearly that there are situations when it is difficult to determine the viewpoint and visual field, important parameters to introduce topological aspects into the pattern space, observing a figure itself. To cope with this problem, this paper proposes transforming the observed image from a figure f(r) to a second-order differential image rho(r), called ''figure source.'' The aim is to reconstruct the theory in such a way as to enable the application of similarity evaluation methods as in the conventional case, without compromising the current theory, and all the necessary proofs are given. In this paper, the figure source equation as well as rules representing its properties are developed, and several related physical quantities are redefined.

关键词： figure source determination of viewpoint and visual field second-order differential image theory reconstruction figure source equation

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Propagation properties of Love wave-type surface-acoustic wave on alpha-quartz

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第2期79卷 24-30页

作者： Isobe, A Hikita, M Asai, K Central Research Laboratory Hitachi Ltd. Kokubunji Japan 185 (Member) graduated from the Department of Physics Tohoku University in 1986 and completed an M.S. course in 1988. In that year he joined Hitachi Ltd. Presently he is with Hitachi Central Research Laboratory. He has been engaged in research on surface acoustic wave devices. (Member) completed the doctoral program of the Department of Electronic Engineering Hokkaido University in 1977 and remained as a research student. In 1978 he joined Hitachi Ltd. Presently he is a Senior Researcher at Hitachi Central Research Laboratory. He holds a Doctor of Engineering degree. He has been engaged in research on the electromagnetic field analysis boundary value problem of the surface acoustic wave interaction of the acoustic wave and optics high-performance SAW filter high-frequency circuit for satellite communication and mobile communication. In 1981 he received an Academic Promotion Award from I.E.I.C.E. In 1990 he received an IEEE MTT Microwave Prize Award. In 1991 he received a Kanto District Invention Award (from the Invention Society) and in 1993 a Commendation for Research Accomplishment from the Director of Science and Technology Agency. He is a senior member of IEEE. (Member) graduated from the Department of Mechanical Engineering Matsuyama Technical High School in 1984 and joined Hitachi Central Research Laboratory. In 1988 he graduated from the Department of Electronic Engineering Hitachi Keihin Technical School. Since then he has been engaged in research and development of the process technology of magnetic bubble memory and surface acoustic wave devices. Presently he is with the Communication Systems Department.

As a piezoelectric substrate for surface acoustic wave devices, the LST cut quartz has good temperature characteristics and low propagation loss. However, as the thickness of the metal electrodes on the substrate surface is increased, propagation loss also increases. Further, the electromechanical coupling coefficient is small. In this paper, a cut angle of the quartz substrate is sought that has excellent temperature stability, low propagation loss, and a large electromechanical coupling coefficient in the present of metal electrode films. For the rotated Y-cut substrate in the neighborhood of the LST cut, the propagating surface acoustic wave (SAW) merle changes from the leaky surface wave to the Love wave-type surface acoustic wave for which. no propagation loss occurs in theory while the electromechanical coupling coefficient increased to 0.5 percent at the maximum if gold is used for the electrodes and the propagation direction of the SAW is shifted from the X axis. This is shown by simulation. By experiment, it is shown that the second-order temperature coefficient is on the same order as that of the ST-cut quartz substrate.

关键词： surface acoustic wave quartz Love wave temperature characteristics

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