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Experimental study of LIM-driven, attraction-type magnetically levitated carrying system

electrical engineering IN JAPAN 1996年第3期116卷 124-131页

作者： Hikihara, T Hirane, Y Uejyou, T Kansai University West Japan Railway Co. Ltd. [?]Ph.D. degree in 1987 in Electrical Engineering from Kyoto University. He joined Kansai University as a Research Associate and is currently an Associate Professor in the Department of Electrical Engineering Kansai University. He was a Visiting Researcher at Cornell University in the U.S. from 1993 to 1994. He is engaged in development of magnetically levitated systems as well as application of high-temperature superconductors modeling of nonlinear phenomena etc. He is a member of IEEE Institute of Electronics Information and Communication Engineers and Institute of Systems Control and Information Engineers.

Recently, many kinds of magnetic levitation systems have been proposed and developed for use in factory automation systems. This progress in the development depends on the appearance of new types of permanent magnets and new control. theories. On the other hand, some systems have simple structures in which couples roles are given for both levitation and conveyance. As for these systems, however, many trials are needed to establish the system configurations and the control theory. The authors have developed a new magnetically levitated carrying system driven by LIM (linear-induction motor). The system can be completely detached from a guideway both in mechanical and electrical meanings.

关键词： ac attraction-type magnetic levitation U-shaped iron core switching control levitated driving characteristics

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System engineering of computer integrated manufacturing

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NAVAL ENGINEERS JOURNAL 1996年第6期108卷 59-71页

作者： Habayeb, AR [?]Abdul R. Habayeb Ph.D. is the weapons command and control technology administrator for the Naval Air Systems Command in Washington D.C. He is recognized in the industry for his work in systems integration and systems effectiveness. His extensive engineering background includes design of logic circuits and control systems performance reliability assessments and analysis and quantification of weapons systems effectiveness. Dr. Habayeb has published several papers reports and a book entitled Systems Effectiveness. Dr. Habayeb previously served as dean of the faculty of engineering and chairman of the electrical engineering department at Yarmouk University in Jordan. Dr. Habayeb has taught systems engineering courses at the University of Maryland and The George Washington University. He holds several patents in the field of switching circuits and data communication and is a senior member of IEEE and Sigma Xi.

Technologies to manufacture affordable systems are of very high interest to naval aviation, the Navy, other services and industry. The current environment of downsizing and continued budget reduction is causing dod to seek effective methods to improve the affordability and availability of critical devices. Computer integrated manufacturing (CIM) and flexible manufacturing (FM) proved to be the appropriate choice for cost effective manufacturing. CIM deals with the effective utilization of computers and automation in manufacturing to improve production (quality yield, cycle time) and reduce the unit product cost. This paper uses a system engineering approach to formulate the architecture and design of an infrared focal plane array CIM factory. A system engineering approach deals with the total issue of building systems: the determination of the requirements, establishing the architecture, performing system partitioning and integration of hardware and software, applying the evaluation measures (metrics), and doing design tradeoff analyses of options and alternatives. At a given partitioning level, system integration is the process of blending hardware and software building blocks into a unified functioning whole. Computer integrated manufacturing is considered the integration of mini-factories (clusters of workcells) through a distributed computing environment (dCE) and the automation of manufacturing processes.

关键词： Computer integrated manufacturing

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Modeling and simulation analysis of indoor packet radio communication systems

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ELECTRONICS ANd communicationS IN JAPAN PART III-FUNdAMENTAL ELECTRONIC SCIENCE 1996年第5期79卷 47-59页

作者： Kasahara, H Hara, S Morinaga, N Student Member Faculty of Engineering Osaka University Suita Japan 565 Member Norihiko MOrinaga received his B.S. degree in Electrical Engineering from Shizuoka University in 1963 and a Ph.D. from Osaka University in 1968. He is currently a Professor on the Faculty of Engineering of Osaka University. He has been engaged in research on wireless communication methods optical communication methods satellite communication methods mobile communication methods and EMC. He received the Telecom Natural Science Award and the Telecom System Technical Award in 1987 and 1993 respectively from the Electronic Communication Association. He translated Optical Comnucnication Systems and is a co-author of Optical Communication Theory and Its Application.

The characteristics of wireless channels are greatly different from those of wire channels. In wireless channels, the capture effect and hidden terminal problems occur. Therefore, it is important that the characteristics of wireless channels are modeled accurately and efficiently when analyzing the total system performance of wireless systems. In this paper, we model the spatial distribution of mobile terminals and base stations for an indoor packet radio communication system. We also model a radio propagation path in terms of Rayleigh fading, logarithmic normal shadowing, and propagation path loss. We then evaluate the packet reception success rate from the channel use, condition of the propagation path, the given modulation/demodulation method and media access protocol, using a bit error rate table. We show a method of analyzing the system characteristics (through-put, packet success rate, and average delay time) efficiently using computer simulations. Also, as an example of numerical analysis, we create Simulation for an indoor radio packet communication System using the direct sequence/spread spectrum (dS/SS) method and analyze its system characteristics.

关键词： Rayleigh fading logarithmic normal shadowing propagation path loss ALOHA CSMA

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Evaluation of radio frequency immunity test facilities based on the scattered field of a conductive sphere

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ELECTRONICS ANd communicationS IN JAPAN PART I-communicationS 1996年第3期79卷 83-91页

作者： Akiyama, Y Kuwabara, N Ideguchi, T Tokuda, M NTT Telecommunication Networks Laboratories Musashino Japan 180 Masamitsu Tokuda:received his B.E. and M.S. degrees in 1967 and 1969 respectively from Hokkaido University and his Ph.D. later. In 1964 he joined Nippon Telegraph and Telephone Electrical Communication Laboratories. Since then he has been engaged in research on transmission measurement method for optical cables EMC of telecommunication equipment. Presently he is the Leader of Tokuda Research Group of NTT Telecommunication Network Laboratories. In 1986 he received an Achievement Award from I.E.I.C.E. He wrote a chapter on measurement in the bookSummaries of Optical Communication. Tsuyoshi Ideguchi:received his B.E. degree from Kyushu University in 1971 and joined Nippon Telegraph and Telephone Electrical Communication Laboratories. Since then he has been engaged in research on shielding cable for induction from the power lines lightning test for telecommunication equipment and EMC test evaluation technique for communication systems. Presently he is a Group Leader for NTT Telecommunication Network Laboratories Communication Quality Department. Nobuo Kuwabara:received his B.E. and M.S. degrees in 1975 and 1977 respectively from Shizuoka University and his Ph.D. degree later. In 1977 he joined Nippon Telegraph and Telephone Ibaraki Electrical Communication Laboratories. Since then he has been engaged in research and development of lightning protection of communication systems reliability evaluation of optical fibers EMI evaluation of the communication systems and optical measurement techniques for EMC. Presently he is a Chief Researcher at NTT Telecommunication Networks Laboratories. Yoshiharu Akiyama:received his B.E. degree from the Department of Communication Engineering University of Electro-Communications in 1990 and joined NTT Telecommunication Networks Laboratories. Since then he has been engaged in research on EMC test evaluation of telecommunication equipment. Presently he is with NTT Telecommunication Networks Lab

In the radiation immunity test for telecommunication equipment, an electromagnetic applicator such as chamber, a transmission electron microscopy (TEM) cell and a general transmission electron microscopy (GTEM) cell are used. Characteristics that include a semianechoic uniformity of the electromagnetic field without a device under test have been evaluated. However, characteristics that include an electromagnetic field in the presence of the device under test have not been reported. In this paper, it is recognized that these electroamgentic applicators are designed in such a way that they can generate an electromagnetic field simulating a plane wave. Based on the electric field distribution generated by the plane wave incident on a conducting sphere, the electric field is evaluated and compared in the case in which the device under test is placed within the applicator. Further, evaluation results are included for the size of the device under test for which the immunity test is possible in each applicator. The evaluation method first derives the theoretical value of the scattered electric field when a plane wave is incident on the conducting sphere in free space. Next, these theoretical values are compared with the measured electric field values around the conducting sphere in each electromagnetic applicator. It was found that the difference between the measured and the theoretical results is the smallest and the frequency dependence is the lowest in a semianechoic chamber. In the case of a TEM cell and a GTEM cell, it was found that the difference between the measured and the theoretical values is less than +6 dB if the magnitude of the device under test is less than one-third the spacing between the inner and outer conductors.

关键词： radiation immunity test semianechoic chamber TEM cell GTEM cell scattered electric field uniformity of the electric field

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Bulk-type domain reversal grating of LiTaO3 crystal fabricated by direct electric field

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ELECTRONICS ANd communicationS IN JAPAN PART II-ELECTRONICS 1996年第2期79卷 70-77页

作者： Sato, M Ohashi, M Abedin, KS Takyu, C Ito, H Member Research Institute of Electrical Communication Tohoku University Sendai Japan 980–77 Received his B.S. degree from Yamagota University in 1984 and his M.S. and Ph.D. degrees from Tohoku University in 1986 and 1994 respectively. He joined Hitachi Co. in 1986. He became a Research Associate at Ishinomaki Senshu University in 1989 and a Research Associate at Tohoku University in 1993. He has been involved in research on nonlinear optics and optical measurement. He is a member of the Japanese Society of Applied Physics. Nonmember Received his B.S. degree from Kanazawa University in 1992 and his M.S. degree from Tohoku University in 1994. At present he is enrolled in the Ph.D. program at Tohoku University. He has been involved in research on nonlinear optical effect of ferroelectrical material. He is a member of the Japanese Society of Applied Physics. Received his B.S. from Bangladesh University of Engineering and Technology (BUET) in 1988 and became an Assistant Professor at the same institute. He received his M.S. degree from Yamagata University in 1993. He is currently enrolled in the Ph.D. program at Tohoku University. He has been involved in research on nonlinear optical crystals doped with rare earth metals semiconductor lasers and optical fibers. He is a member of the Japanese Society of Applied Physics. Graduated from Konahama Marine High School in 1969 and became a Research Technician at Tohoku University in the same year. He has been involved in research on laser measurement and the processes of semiconductors and dielectric material. Received his B.S. and Ph.D. degrees from Tohoku University in 1966 and 1972 respectively. At present he is a Professor at Tohoku University. He was invited to Stanford University during 1975–1976. He has been involved in research on laser and nonlinear optics integrated optics and semiconductor lasers. He received the Yonezawa Award in 1971 and Manuscript Award in 1989. He is a member of the Japanese Society of Applied Physics IEEE and OSA.

Bulk-type domain reversal gratings of LiTaO3 crystal were fabricated at room temperature by the direct electric field method, The nonlinear optical. property of the crystal was evaluated by quasi-phase matching. The period of the bulk-type domain reversal gratings on an LiTaO3 substrate was 7.5 mu m and the domain reversal extended to the entire substrate thickness of 500 mu m. The experimental normalization efficiency was 0.46%/W . cm in carder quasi-phase matching and was close to the theoretical value (0.48%/W . cm). This result indicates that high-efficiency nonlinear interaction could be achieved by using the bulk-type domain reversal grating, The bulk-type domain reversal grating of nonlinear optical crystal such as LiTaO3 is expected to be useful for compact nonlinear optical devices and integrated laser sources.

关键词： bulk-type domain reversal grating electrical field-induced polarization quasi-phase matching

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design of dielectric multilayer bandpass filters using fundamental thickness of layers

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ELECTRONICS ANd communicationS IN JAPAN PART II-ELECTRONICS 1996年第6期79卷 31-42页

作者： Wakabayashi, I Miyauchi, K Faculty of Engineering Science University of Tokyo Tokyo Japan 162 Received his B.E. and M.E. degrees in Electrical Engineering from the Science University of Tokyo in 1974 and 1976 respectively. He joined the Science University of Tokyo as an Instructor of Electrical Engineering in 1976. Since then he was involved in research on measurements of surface topography by using evanescent wave in microwave. Since the end of 1990 he has been involved in research on optical and microwave filters. He is a member of the Society of Applied Physics (Japan) and IEEE. Nonmember Graduated from the University of Tokyo in Electrical Engineering in 1954 and joined NTT the same year. He was appointed as a member of the technical staff department director vice director-general of Research and Development Bureau director of Radio System and Network Laboratory etc. of Electrical Communication Laboratories. During this period he was involved in research development and management of microwave and millimeter wave high-speed digital communication systems satellite communication systems communication satellite on-board equipment (CS-2CS-3N-STAR etc.) submarine optical fiber communication systems mobile communications etc. In 1986 he joined the Science University of Tokyo as a Professor. He received his Ph.D. degree from the University of Tokyo in 1966 and is an IEEE Fellow. He was chairman of the Microwave Research Committee chairman of the Satellite Communications Research Committee chairman of IEEE MTT Tokyo Chapter chairman of Microwave APMC'90 International Symposium Organizing Committee Member of the Radio Science Committee of the Science Council of Japan etc. He received the Paper Award of this Society (two times) Achievement Award Mainichi Industrial Technology Award etc. He is the author ofMicrowave Circuits for Communications Digital Satellite Communications Microwave and Optical Engineering Satellite Communication Networks An Introduction to Communication Systems and other books.

The general design principle of the dielectric multilayer bandpass filters proposed by the authors is applied to the case where only the fundamental thickness of dielectric layers are used. The actual design procedure, layer structure, necessary formulation in the design, conditions, and design examples are presented. Further, with respect to various combinations of the parameters, 900 filters are designed and their characteristics are verified to show the distribution of their design errors. In actual designs, the objectives are third-, fifth-, and seventh-order Butterworth and Chebyshev filters (0.5-dB and 1-db ripples) using SiO2 and TiO2 and the center wavelength of 1.3 mu m. The percentage bandwidths am taken to be up to 10 percent with angles of incidence up to 30 deg with P or S polarizations. It is understood that, when the bandwidth is set to be less than 5 percent or when it is set in the range of 5 to 10 percent, it is possible to achieve designed filters with percentage bandwidth errors below 1 percent and 3 percent, respectively. In all Butterworth filters, the insertion loss at the center wavelength was below 0.04 dB. For the objective ripple in Chebyshev filters set at 0.5 dB, the maximum ripples of all filters distribute within 0.15 to 2 dB while, in the case of l-dB objective ripple, they are in the range from 0.4 to 2.3 dB.

关键词： dielectric multilayer bandpass filters fundamental thickness of dielectric layers Butterworth Chebyshev

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Fabrication of SiN films at low temperature by RF biased coaxial-line microwave plasma CVd

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ELECTRONICS ANd communicationS IN JAPAN PART II-ELECTRONICS 1996年第11期79卷 58-65页

作者： Morita, Y Kato, I Nakajima, T School of Science and Engineering Waseda University Tokyo Japan Received a B.S. in 1992 from the Department of Electronics and Communication Waseda University. He is now enrolled in the Ph.D. program at the same university. He has been involved in research on microwave plasma CVD. He is a member of the Japanese Society of Applied Physics. Received the B.S. and Ph.D. degrees from the Department of Electronics and Communication Waseda University in 1967 and 1973 respectively. In 1973 he joined the faculty of Waseda University becoming an associate professor in 1978. He was Visiting Professor at Manitoba University Canada in 1979–1981. He has supervised research and participated in joint research with die Canadian National Research Council. He became a professor at Waseda University in 1993. He has been involved in research on microwave plasma CVD photonics lasers electronic materials evaluation technologies photonic materials opto-quantum electronics and semiconductor dun films. He is a member of die IEE of Japan die Japan Society of Applied Physics die TV Society die Japanese Vacuum Society and IEEE. Received die B.S. from die Department of Electronics and Communication Waseda University in 1994. He is now enrolled in die master's program at die same university. He has been involved in research on microwave plasma CVD. He is a member of die Japan Society of Applied Physics.

This paper discusses the influence of ion bombardment on the characteristics of SiN films. In this study, the double-tube coaxial-line microwave plasma CVd system, which is suitable for the investigation of ion bombardment, is used to deposit SiN films. The ion bombardment energy is varied by varying the RF bias at constant ion density, As the RF bias is increased, the film density increases and the hydrogen concentration decreases, but the dangling bond density increases. The increase in the film density and decrease of hydrogen concentration are caused by the increase in film surface temperature, while the increase of the dangling bond density is caused by bond breakage due to the N+ ion implantation. When the substrate temperature is 200 degrees C and the RF bias is -175 V, the film density is 3 g/cm(3) and the hydrogen concentration is 9 at.% because of the film surface heating effect of ion bombardment acid also due to substrate heating. Substrate heating at 200 degrees C suppresses the increase in the dangling bond density. It is also demonstrated that the film surface temperature is about 200 degrees C when RF bias is -70 similar to-80 V and the substrate is unheated by any heater.

关键词： microwave plasma CVd SiN film RF bias ion bombardment effect film surface hearing effect

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Elastic wave energy-trapping and its application to piezoelectric devices

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ELECTRONICS ANd communicationS IN JAPAN PART II-ELECTRONICS 1996年第7期79卷 30-39页

作者： Nakamura, K Faculty of Engineering Tohoku University Sendai Japan 980 Graduated from the Department of Electrical Communications Tohoku University in 1966. He received his Master's degree and Ph.D. degree from Tohoku University in 1968 and 1975 respectively. He was a Research Associate at Tohoku University in 1968 and was appointed as an Assistant Professor in 1976 and as a Professor in 1988. He has engaged in research and development on ultrasonic electronics piezoelectric materials and devices surface acoustic devices and tunable optical filters and ferroelectric domain inversion phenomena. He received a Best Paper Award from the Institute of Electronics and Communication Engineers of Japan in 1979. He is a member of the Acoustical Society of Japan the Japan Society of Applied Physics and IEEE.

If it is possible to trap elastic wave energy in a localized region of an elastic solid, it is possible to support the solid at a location where no vibration occurs. This enables highly reliable, low-loss piezoelectric devices to be developed. In this paper various energy-trapping elastic wave phenomena and vibration ate discussed and their applications to various piezoelectric devices such as strip resonators, monolithic filters, piezoelectric transformers, vibratory gyroscopes and SAW devices are described.

关键词： elastic wave energy-trapping piezoelectric device piezoelectric resonator piezoelectric filter

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Fabrication of dispersive fibers and their application to long wavelength-pass filters

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ELECTRONICS ANd communicationS IN JAPAN PART II-ELECTRONICS 1996年第3期79卷 9-15页

作者： Nishimura, J Ueda, Y Morishita, K Graduate Course of Electronics and Applied Physics Osaka Electro-Communication University Neyagawa Japan 572 Received his B.S. and M.S. degrees in 1992 and 1994 respectively from Osaka Electro-Communication University where he is at present enrolled in the doctoral program. He is engaged in research on optical fiber devices. Received his B.S. degree in 1994 from Osaka Electro-Communication University where he is currently in the graduate program. He is engaged in research on optical fiber devices. Received his B.S. and Ph.D. degrees from Osaka University in 1972 and 1977 respectively. He became a Postdoctoral Fellow of the Japan Society for the Promotion of Science in 1977. He became a Lecturer an Associate Professor and Professor at Osaka Electro-Communication University in 1981 1983 and 1989 respectively. He was a Visiting Research Fellow at Southampton University between 1986 and 1987. He has been involved in research on waveguide properties of optical fibers refractive index evaluation of optical waveguides and optical fiber devices. He is the author ofOptical Fibers(Asakura Publ.). He is a member of the Institute of Electrical Engineers of Japan the Society of Instrument and Control Engineers of Japan the Optical Society of Japan and OSA. He is a Senior Member of IEEE.

dispersive fibers are fabricated in which the refractive index dispersions of the core and cladding cross at a certain wavelength. The core and cladding were made of different types of optical glasses. To pass a long wavelength light (to suppress short wavelength light), the refractive index of the core was chosen to be lower than that of the cladding in the short wavelength region. In the fabricated dispersive fibers, no waveguide mode was observed in the short wavelength region, indicating that the fibers play the role of a long wavelength pass filter. To evaluate the fibers as an optical filter, the transmission loss and insertion loss were investigated and it was found that the pass wavelength region could be controlled by changing the curvature of the fibers.

关键词： dispersive fiber optical filter fiber optical devices optical glass

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Proof Method for correctness of refinements of algebraic specification in abstract sequential machine style

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SYSTEMS ANd COMPUTERS IN JAPAN 1996年第5期27卷 25-38页

作者： Okano, K Higashino, T Taniguchi, K Member Faculty of Engineering Science Osaka University Toyonaka Japan 560 Teruo Hipshino received his B.E. M.E.and Ph.D. degrees in Information and Computer Sciences from Osaka University Osaka Japan in 1R9 1981 and 1984 respectively. He joined the Faculty of Osaka University in 1984. Since 1991 he has been an Associate Professor in the Department of Information and Computer Sciences at Osaka University. In 1990 he was a Visiting Researcher of Dept. I.R.O. at University of Montreal Canada. His current research interests include design and analysis of distributed systems specification and verification of communication protocols and formal approach of program design. He is a member of IEEE-CS ACM IEICE of Japan and IPS of Japan.

In this paper, new methods for providing the correctness of refinement among abstract sequential machine style programs are described. The programs are described in algebraic language ASL using some useful notions, i.e., the extended projection and the valid reachability condition for each transition function. These notions allow a designer to refine a given text (program or specification) to a concrete text more freely than the text that does not use such notions. These notions can also enhance the expressive power of the text. On the other hand, these advantages would have lost half their values, if useful methods to prove the correctness of refinement among the texts using them are not found. Thus new methods for proving the correctness of the texts are proposed, and they do not require much proof loads. First, the correctness of refinement among the ASL texts with the extended projection is defined. Second, a method is proposed for proving the correctness of refinement among such texts. Also proposed is a definition of the correctness of refinement among the texts with the valid reachability conditions and a method to prove their correctness. These methods do not require more proof loads than the usual methods for the texts that do not use such notions in the abstract sequential machine style. Therefore, these methods are useful.

关键词： abstract sequential machine ASL language proof algebraic specification

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