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A METHOD FOR ALGEBRAIC ANALYSIS OF THE TLM ALGORITHM

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第1期8卷 61-71页

作者： WITWIT, ARM WILKINSON, AJ PULKO, SH Department of Electronic Engineering The University of Hull Hull HU6 7RX U.K. Abdul Mehdi Witwit was born in Babylon in 1965. He graduated in Electronic Engineering from the Univeristy of Hull in 1990. He has recently submitted his Ph.D. thesis on the topic of meshing in TLM diffusion problems. Anthony James Wilkinson graduated from the niversity of Hull with a B.Sc. in Electronic Engineering in 1982 and a Ph.D. in adaptive control in 1987. He is currently a lecturer in the Department of Electronic Engineering where his research interests include TLM algorithms and computer control of magnetostrictive actuation. Susan Pulko obtained a B.Sc. in physics together with an ARCS from Imperial College (London) in 1977. This was followed by a Ph.D. from the University of Nottingham in 1981. Her current research interests centre on the TLM algorithm and on its application to a range of physical processes especially as applied to manufacturing. Current work involves development of the algorithm itself and TLM applications in the glass and ceramic industries.

An analogy is described between the TLM algorithm and discrete state-space control theory. The analogy is used to derive the characteristic equations corresponding to parameterized model structures. Characteristic equations corresponding to several widely used node structures are derived by this means and found to be consistent with the observed behaviour of corresponding TLM models. An example is given of the use of the analogy in the predictive mode.

关键词： Algorithms

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A SHEWHART-LIKE CHARTING TECHNIQUE FOR HIGH-YIELD PROCESSES

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QUALITY AND RELIABILITY engineering INTERNATIONAL 1995年第3期11卷 189-196页

作者： XIE, W XIE, M GOH, TN Department of Industrial and Systems Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 0511 M. Xie:graduated from Royal Institute of Technology in Stockholm Sweden and received an M.Sc. in 1984. He received a Licentiate and a Ph.D. from Linkoping University Sweden in 1986 and 1987 respectively. After four years doing active research and teaching at that university he became one of the first recipients of the LKY fellowship in 1991 tenable at the National University of Singapore. Currently he is working as a senior lecturer. Dr. Xie has published more than 50 papers internationally and a bookSoftware Reliability Modellingby World Scientific Publishers. A member of IEEE ASA and SRE Dr. Xie has also been a committee member of a few international conferences. W. Xie:graduated from Xi'an Jiaotong University in 1989 with a Bachelor's degree and an M.Sc. degree in 1992. After working at Digital Equipment Corporation Shenzhen China for about a year she was awarded a scholarship to pursue postgraduate degree at National University of Singapore. She has been doing research on statistical process control techniques since then.

A Shewhart-like charting technique is developed in this paper to overcome the difficulties the traditional control chart encounters in the control of processes with a very low fraction non-conforming. The technique uses the number of conforming items between two consecutive non-conforming ones to monitor the fraction non-conforming of a process, leading to a chart that is informative and easy to interpret. The approach discussed is especially suitable for real-time and automatic statistical quality control.

关键词： STATISTICAL PROCESS control HIGH YIELD PROCESSES CONFORMING RUN LENGTH CHART FOR ATTRIBUTES

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ON A METHOD OF CRYPTANALYSIS FOR CRYPTOSYSTEM WITH INVOLUTION

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE 1995年第5期78卷 1-11页

作者： TSUNOO, Y OKAMOTO, E UEMATSU, T Member NEC Software Hokuriku Ltd. Ishikawa Japan 920-21 School of Information Science Japan Advanced Institute of Science and Technology Ishikawa Japan 923-12 Members Tomohiko Uyematsu graduated in Electrical Engineering from Tokyo Institute of Technology in 1982 and received a Master's degree from the same university in 1984 after whichhe became an assistant in the Electrical and Electronics Engineering Department there. In1990 he became a Lecturer and in 1991 an Assistant Professor. In 1992 he became Assistant Professor at the School of Information Science Japan Advanced Institute of Science and Technology. He holds a doctorate in engineering. Among his research interests are signal theory optical communications theory coding theory and data compression algorithms. In 1988 he received a Shinohara Commemorative Science Encouragement Prize and in 1992 a Best Paper Award. He is the author of the bookIntroduction to Record Data Compression Algorithms. He is a member of the Measurement Control Society and the Society for Information Theory and Its Applications.

Cryptology provides the technological basis for guaranteed network security. In the field of business, to guarantee the security of information, everyone needs easy-to-use cryptology. Starting with the announcement by the U.S. National Bureau of Standards of the DES cryptosystem and the proposal by NTT of the FEAL cryptosystem, secret-key cryptographic algorithms have been published, involution-type block cryptosystems which use secret key to encipher 64 bits of plain text as 64 bits of cipher text [2, 3, 9, 10, 12]. NTT has proposed the one-way function MAP, which is also an involution-type transform. In this paper, we study a new cryptanalytic method for involution-type cryptosystems and show by example that it can be applied practically in a ciphertext-only attack on the one-way function MAP. For an involution-type cryptosystem, by increasing the amount of construction in the data-randomization phase and by increasing the size of the secret key, we can guarantee the computational security by preventing the estimation of the secret key. However, if we study the properties of the function used in the design of the data-randomization phase, by specifying input/output values of the function which are independent of the secret key, it may be possible to use the inverse function [11] to calculate the secret key. This method is called the intermediate cipher method. The intermediate cipher method differs from previous methods in the small quantity of data required for breaking.

关键词： INVOLUTION BLOCK CIPHER INTERMEDIATE CIPHER CIPHERTEXT-ONLY ATTACKS

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CHARACTERISTICS ANALYSIS OF SUPERCONDUCTING POWER TRANSFORMER WITHOUT IRON CORE

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ELECTRICAL engineering IN JAPAN 1994年第8期114卷 80-92页

作者： YAMAGUCHI, H SATO, Y KATAOKA, T Tokyo Institute of Technology Yukihiko Sat0 graduated in 1986 from the Department of Electrical and Electronic Engineering Tokyo Institute of Technology. He received a Master's degree (Electrical and Electronic Engineering) from the same university in March 1988. He is currently a Research Assistant in the Department of Electrical and Electronic Engineering of the same university. His works are mainly analysis and control method of semiconductor power converters superconducting applications and variable-speed ac drives. He is a member of the IEEE.

With the progress of superconducting wires for ac power use, research on superconducting power transformers is increasing. These transformers can be divided into two types: the iron-core type [1, 2];and the air-core type [3-9]. The latter type has such advantages as absence of iron losses and magnetic saturation, and greater possibility of reduction of size and weight. However, the air-core transformer has a large magnetizing current due to the absence of iron core. Hence, research has been carried out on the possibility of using the air-core transformer also as a shunt reactor in a power transmission system. However, the operating characteristics of the air-core transformer, such as voltage regulation and reactance voltage, are not clear at present. In this paper, the equivalent circuit without losses is proposed first. Since this equivalent circuit is expressed by means of the magnetic coupling factor and self-inductances of windings, the effect of these parameters on the transformer characteristics can easily be investigated. Then, based on this equivalent circuit, the per-unit expressions for the air-core transformer characteristics are derived and the characteristics are analyzed in detail. The validity of the theoretical results are confirmed by experimental results obtained by the use of an experimental superconducting transformer.

关键词： SUPERCONDUCTING TRANSFORMER AIR CORE EQUIVALENT CIRCUIT MAGNETIC COUPLING FACTOR

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RESIDENTIAL SOLAR-POWERED AIR-CONDITIONERS

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ELECTRICAL engineering IN JAPAN 1994年第3期114卷 123-133页

作者： TANAKA, K MAKINO, Y SAKOGUCHI, E TAKEOKA, A KUWANO, Y Sanyo Electric Co. Ltd. Kuniho Tanaka graduated in March 1981 from the Department of Electronic Engineering Nagasaki University and joined Sanyo Electric Co. Ltd. in April of the same year. He is currently a Senior Researcher in the Power Electronics Research Section of Control System Research Laboratory.

The power demand in Japan increases yearly especially in summer, and peaks in the daytime. The main cause is the drastically increased load of air conditioners used widely in general residences. The load pattern of air conditioners is very similar to the output pattern of a photovoltaic (PV) array. Therefore, Sanyo has been developing two types of residential solar-powered air conditioners. One is a unidirectional system by using a dc/dc converter which controls the voltage of a PV array at its optimal operation point and boosts the voltage up to the dc voltage of an inverter-type air conditioner. The other is a bi-directional system by using a bi-directional current-control converter, which regenerates surplus power into a commercial system from a PV array, and suppresses the input current distortion of an air conditioner. In this paper, the configurations and experimental results are described and discussed.

关键词： PHOTOVOLTAIC CELLS INVERTER-TYPE AIR CONDITIONER SYSTEM INTERCONNECTION CO2 REDUCTION SUMMER PEAK POWER SUPPRESSION

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FDTD ANALYSIS OF CROSSTALK IN MULTILAYER PRINTED-CIRCUITS

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1994年第3期7卷 209-221页

作者： CERRI, G DELEO, R PRIMIANI, VM SCHIAVONI, A Dipartimento di Elettronica ed Automatica Università di Ancona Via Brecce Bianche 60131 Ancona Italy Graziano Ceni was born in Ancona Italy in 1956. He received the degree in electronic engineering from the University of Ancona in 1981. Since 1983 after military service in the Air Force Engineer Corps he has been a Researcher with the Department of Electronics and Automatics at the University of Ancona. His research is mainly devoted to microstrip antennas and integrated optics. Currently he is also involved in EMC problems and in the analysis of the interaction between electromagnetic fields and biological bodies. Roberto De Leo was born in Ban Italy in 1942. He graduated from the Politecnico di Torino in 1965. From 1966 to 1980 he was at the University of Bari working on microwave devices. Since 1980 he has been a full Professor of E\ectromagnetics at the University of Ancona. His areas of interest are medical applications of electromagnetic waves and electromagnetic compatibility. Valter Mariani Priiani was born in Rome Italy in 1961. Since 1981 he has been a laboratory researcher at the University of Ancona. He received the degree in electronic engineering at the University of Ancona in 1990 his area of interest concerns microwave patch antennas medical applications of electromagnetic waves and electromagnetic compatibility. Now he is responsible for the EMC laboratory. Andrea Schiavoni was born in Jesi Italy in 1963. He received the degree in electronic engineering from the University of Ancona in 1990. At present he is a Ph.D. student in the Department of Electronics and Automatics University of Ancona. His research interests are numerical modelling in electromagnetic compatibility and the interaction of electromagnetic fields and biological bodies.

A theoretical analysis has been developed to study the crosstalk in crossed bundles of parallel lines. The model is based on the theory of the coupled transmission lines and the resulting system of differential equations has been solved by means of the finite difference, time-domain (FDTD) method. The frequency response of the network has been achieved by the discrete fourier transform (DFT) algorithm;measurements, performed with a vectorial network analyser, show a good agreement with numerical simulation.

关键词： Crosstalk

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BROAD-BAND ISLAND INTERCONNECTION VIA SATELLITE - PERFORMANCE ANALYSIS FOR THE RACE-II CATALYST PROJECT

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 223-238页

作者： HADJITHEODOSIOU, MH KOMISARCZUK, P COAKLEY, F EVANS, BG SMYTHE, C Centre for Satellite Engineering Research University of Surrey Guildford GU2 5XH U.K. Obtained an M.A. in Electrical and Information Sciences from the University of Cambridge in 1989 and an M.S. in Electrical Engineering from the University of California Irvine in 1991. He is currently a Research Fellow at the Centre for Satellite Research University of Surrey U.K. His research interests include multiple access protocols for VSAT networks voice/data integration in low-bit-rate networks and the use of satellites for the provision of BISDN services. Obtained a B.Sc. in Pure and Applied Physics with Electronics in 1983 and an M.Sc. in Modern Electronics in 1984 from the University of Nottingham U.K. He was a project engineer on the Corporate Data Network for the Central Electricity Generating Board U.K. and then a senior lecturer in communication systems at the University of Greenwich UK. At present he is working on his Ph.D. at the Centre for Satellite Engineering Research (CSER) University of Surrey on the performance of communication systems. Has been Senior Lecturer in the Department of Electrical Engineering University of Surrey since 1984. She is the author (or joint author) of more than 80 research papers. Currently she teaches courses in Telecommunication Networks and Computer Architecture. Her research interests include on-board processing for satellites protocols and performance issues. Received the BSc. and Ph.D. degrees in Electrical Engineering and Microwave Systems from the University of Leeds in 1965/1968. He was British Telecom Lecturer-Reader in Telecommunications Systems at the University of Essex from 1969–1983. In 1983 he was appointed to the Alec Harley Reeves Chair of Information Systems Engineering at the University of Surrey and in 1990 became the first Director of the post-graduate centre for Satellite Engineering Research which houses some 100 researchers. In 1992 he was made a Fellow of the Royal Academy of Engineers in the U.K. and is a Fellow of IEE and a member of IEEE

The use of communication satellites as a possible way of offering broadband island interconnectivity appears to be a very attractive option, as it will enable the provision of an all-digital, transparent service to a number of ATM islands spanning a wide area, accommodating efficiently a variety of traffic demands. The CATALYST Project (RACE II/R2074) is an attempt to demonstrate the applicability and compatibility of satellite technology with the terrestrial BISDN. In this paper we present an overview of the project and focus on an initial study of the expected user performance through the CATALYST network. Our analysis is based upon mathematical and simulation models and describes the end-system to end-system transfer delay for given message lengths. The protocol profiles assume a mix of Novell NetWare and Network File System client/server architectures, which are supported by either the IEEE 802.3/Ethernet or fibre distributed data interface LANs, which are themselves linked via LAN/ATM/satellite interface units. Areas of further investigation, and the implication of our analysis on the actual network architecture, are discussed.

关键词： ASYNCHRONOUS TRANSFER MODE (ATM) BROAD-BAND ISDN SATELLITE COMMUNICATIONS

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MAIN PROPULSION POWER TAKE-OFF CONFIGURATION FOR AN ETC GUN PULSED-POWER GENERATOR

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 52-58页

作者： PETTERSEN, KE BIELITZ, CL CIANCI, J Kenneth E. Pettersen:graduated from the University of Maryland Baltimore County in J 978. He is a mechanical engineer in the power systems directorate of the Annapolis Detachment Carde-rock Division Naval Surface Warfare Center (formerly David Taylor Research Center) and has been with the Department of the Navy since 1981. Mr. Pettersen worked for the Naval Sea Systems Command from May 1981 until June 1985. He has been employed with NSWC Annapolis Detachment since June 1985. Charles L. Bielitz:is a mechanical engineer in the mechanical transmissions branch of Annapolis Detachment Carderock Division Naval Surface Warfare Center where he has worked for the past six years. He received his BSME from Virginia Polytechnic Institute in 1981. Prior to joining NSWC Annapolis he was employed by the General Electric Company in the medium steam turbine department. John Cianci:received his ASME from Tufts University in 1958 and his BSME from Tufts University in 1962. Mr. Cianci joined General Electric in 1954. He has thirty-seven years of experience in design manufacturing testing installation and customer support of high speed high power industrial marine and Navy gearing bearings couplings and lube systems. His experience includes positions of both engineer and manager in the areas of gear design gear products quality control and gear manufacturing engineering he is currently technical leader Gear Development Programs. He is a member of the American Gear Manufacturers Association and is on the Marine and High Speed Gearing committees.

Electro-Thermal Chemical (ETC) Gun technology will increase the range and capabilities of existing CIWS and 5 inch guns. Because of their faster, yet more controllable acceleration, ETC guns will allow for the utilization of smart munitions and, in the case of the 5 inch guns, increase range to beyond 50 nautical miles. This paper examines five power take-off (PTO) gear configurations from a surface ship class main reduction gears (MRG's) which drive a nominal 10 Megawatt (MW) Pulsed Power (PP) generator. The PP generator is utilized to charge a capacitor-based pulsed forming network (PFN) which, in turn, provides an electrical pulse to the cartridge of a munition at the breech of an ETC gun upon demand. The PTO gear and resultant placement of the generator will be the major focus of this paper. Major issues that will be examined will include space constraints within the main engine and auxiliary machinery rooms, gear sizing, survivability, shock and vibration, the penetration of watertight bulkheads with high speed shafting and equipment accessibility. Also, design guidelines for the PP generator will be provided. Special emphasis will be placed on the connection of the PTO gear to the MRGs.

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USING VIRTUAL ENVIRONMENTS IN THE DESIGN OF SHIPS

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 91-106页

作者： JONS, OP RYAN, JC JONES, GW Otto P. Jons:received a Diplom Ing. in shipbuilding from the Technical University of Hanover W. Germany and an MS in naval architecture and marine engineering from MIT. He then joined Litton Ship Systems where he was responsible for the preliminary design of the DD-963 hull structure and then for ship system integration as manager LHA ship systems engineering department. From 1972 to 1974 he was the principal research scientist at Hydronautics. In 1974 as technical director he helped establish the Crystal City office of Designers and Planners. Mr. Jons was one of the co-founders of Advanced Marine Enterprises Inc. in 1976 where he serves as corporate vice president engineering. J. Christopher Ryan:earned his bachelors and masters degrees in naval architecture from Webb Institute and MIT respectively. He spent three years at the advanced marine technology division of Litton Industries working on the DD-963 class ship design and related computer aided design projects. He subsequently went to the Navy Department concentrating on early stage design of surface combatants for twelve years including work on the FFG-7 Sea Control Ship CSGN and CVV aircraft carrier projects. He then shifted focus and became the Technical Director for the Computer Supported Design Program in NavSea for five years. Mr. Ryan has served in several supervisory positions within the Ship Design Group in NavSea since that time. He is currently the director of the future ship concepts division. Gary W. Jones:graduated from the University of Tennessee in 1971 with a BS in mechanical engineering and followed up with graduate work at George Washington University and the University of Maryland. Mr. Jones was with the Naval Sea Systems Command from 1971 until 1988 where he was a naval architect in the submarine section of the hull form design division. In 1988 he was detailed to the Defense Advanced Research Projects Agency (DARPA) where he became the program manager for the advanced submarine technology program's hydrodynamic hydroac

A major contributor to the expense and length of time to design, build, and test new systems has been the need to build and test hardware prototypes to determine their effectiveness in meeting operational requirements. Recent and dramatic advances in computer simulation technologies hold forth the promise of revolutionizing design and acquisition strategies by providing the means to validate end users' requirements prior to hardware construction. By designing and operationally testing virtual prototypes in a virtual environment, these technologies will soon offer naval architects the ability to build and launch ships in computer-based cyberspace in lieu of the shipbuilder's ways. The authors of this paper provide the background for these developments, explore the significance and ramifications of these technologies to the current process of ship and system design, outline challenges lying ahead, and present their vision and recommendations for future development.

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HYDROCARBON VAPOR DIFFUSION IN INTACT CORE SLEEVES

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GROUND WATER MONITORING AND REMEDIATION 1993年第1期13卷 139-150页

作者： OSTENDORF, DW MOYER, EE XIE, YF RAJAN, RV 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. Ostendorf is a Registered Professional Engineer in Massachusetts and a member of the American Geophysical Union American Society of Civil Engineers Soil Science Society of America Water Pollution Control Federation and Association of Environmental Engineering Professors as well as the National Ground Water Association. Ellen E. Moyer (Civil Engineering Department University of Massachusetts Amherst MA 01003) is a doctoral candidate in the Environmental Engineering Program of the Civil Engineering Department of the University of Massachusetts at Amherst with an M.S. degree in environmental engineering from that institution. Her research interests include subsurface investigation soil venting bioremediation and analytical modeling of subsurface contamination. She has six years of professional experience managing hazardous waste site investigation and cleanup projects and is a member of the National Ground Water Association and the American Society of Civil Engineers. Yuefeng Xie (Civil Engineering Department University of Massachusetts Amherst MA 01003) is a postdoctoral research associate in the Environmental Engineering Program of the Civil Engineering Department of the University of Massachusetts at Amherst. His research interests include environmental analyses drinking water treatment and the chemical characterization and removal of disinfection by-products. A graduate with a Ph.D. and an M.S. in environmental engineering and a B.S. in chemistry and chemical engineeering from Tsinghua University Beijing China Xie is a member of the American Water Works Association and the Water Poll

The diffusion of 2,2,4-trimethylpentane (TMP) and 2,2,5-trimethylhexane (TMH) vapors out of residually contaminated sandy soil from the U.S. Environmental Protection Agency (EPA) field research site at Traverse City, Michigan, was measured and modeled. The headspace of an intact core sleeve sample was swept with nitrogen gas to simulate the diffusive release of hydrocarbon vapors from residual aviation gasoline in and immediately above the capillary fringe to a soil-venting air flow in the unsaturated zone. The resulting steady-state profile was modeled using existing diffusivity and air porosity estimates in a balance of diffusive flux and a first order source term. The source strength, which was calibrated with the observed flux of 2,2,4-TMP leaving the sleeve, varied with the residual gasoline remaining in the core, but was independent of the headspace sweep flow rate. This finding suggested that lower soil-venting air flow rates were in principle as effective as higher air flow rates in venting LNAPL vapors from contaminated soils. The saturated vapor concentration ratio of 2,2,4-TMP to 2,2,5-TMH decreased from 6.6 to 3.5 over the duration of the experiments in an expression of distillation effects. The vertical profile model was tested against sample port data in four separate experiments for both species, yielding mean errors ranging from 0 to -24 percent in magnitude.

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