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EFFECTS OF SAMPLE ISOLATION ANd HANdLING ON THE RECOVERY OF PURGEABLE ORGANIC-COMPOUNdS

GROUNd WATER MONITORING ANd REMEdIATION 1994年第2期14卷 142-152页

作者： GIBS, J IMBRIGIOTTA, TE FICKEN, JH PANKOW, JF ROSEN, ME Jacob Gibs is a water quality specialist with the USGS Water Resources Division (810 Bear Tavern Rd. Ste. 206 West Trenton NJ 08628). He received his B.S. in mechanical engineering in 1968 his M.S. in environmental engineering in 1975 and his Ph.D. in environmental engineering in 1983 all from Drexel University in Philadelphia. His research interests include evaluating representative ground water and surface water sampling techniques for trace levels of organic and inorganic compounds and designing new sampling devices. Thomas E. Imbrigiotta received a B.S. in chemistry with a concentration in environmental studies from Oakland University Rochester Michigan in 1975. He then attended the University of Wisconsin Madison and received an M.S. in water chemistry in 1982. He has been a hydrologist with the USGS Water Resources Division (810 Bear Tavern Rd. Ste. 206 West Trenton NJ 08628) since 1977. He worked in the Indiana District from 1977 to 1984 prior to coming to the New Jersey District. Currently he is project coordinator for the Picatinny Research project a study of the fate and transport of chlorinated solvents in ground water at Picatinny Arsenal New Jersey. Previously he was chief of a project evaluating sampling techniques for organics in ground water. James H. Ficken worked for the USGS Water Resources Division as a chemical engineer from 1964 to 1992. He received his B.S. in chemical engineering in 1962 from Washington University in St. Louis Missouri. His research interests were water quality instrumentation and sensors that measure real-time environmental data. He contributed as a team member to the design and development of the USGS water quality flow-through and mini-monitor system. Ficken passed away in 1992. James F. Pankow is a professor in the Department of Environmental Science and Engineering at the Oregon Graduate Institute (Oregon Graduate Institute of Science and Technology Department of Environmental Science and Engineering P.O. Box 1900 Portland OR 97291–1000). He

This report compares the recovery of purgeable organic compounds (POCs) obtained by using a downhole isobaric sampler developed by the U.S. Geological Survey, a helical-rotor submersible pump, and a point source bailer to collect and isolate samples of ground water from three wells in New York and New Jersey, the samples contained a total of 13 POCs detectable at concentrations ranging from 0.5 mug/L to about 400 mug/L. This report also compares the effects of sample handling, specifically the differences in POC concentration recovery when an isobaric sample container is filled at land surface vs. when it is filled downhole, and when samples are taken using a bailer with and without a bottom-emptying device. These case studies are used to quantify the possible effects of different sample-isolation and sample-handling techniques on POC recovery. The relative effectiveness of the three devices varied by site and by compound. Overall, the POC recoveries achieved by using the helical-rotor submersible pump and the downhole isobaric sampler were not significantly different at the 95 percent confidence level. POC recovery obtained by using the point source bailer was 11 percent lower overall. The downhole isobaric sampler results exhibited smaller coefficients of variation than did the helical-rotor submersible pump or the point-source bailer results. However, the differences between the coefficients of variation of the downhole isobaric sampler and those of the helical-rotor submersible pump were not significant the 95 percent confidence level. The nonsignificant smaller coefficient of variation of the downhole isobaric sampler apparently resulted from two fewer sample handling steps that exposed the sample water to ambient air. An independent experiment performed with a different downhole sampler at one of the wells used in this investigation produced a similar statistical result. Also, the POC recovery obtained by pouring sample water out the top Of a point source bail

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NUMERICAL-METHOd FOR CALCULATING SURFACE CURRENT-dENSITY ON 3-dIMENSIONAL SMOOTH SCATTERERS

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ELECTRONICS ANd COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1994年第2期77卷 1-11页

作者： IKUNO, H GONdO, M NISHIMOTO, M Faculty of Engineering Kumamoto University Kumamoto Japan 860 Himyoshi Ikmo received his B.E. M.E. and Ph.D. from Kyushu University in 1962 1964 and 1979 respectively. From 1967 to 1970 he was a Research Associate in Computer Science and Communication Engineering at Kyushu University. He joined the Department of Electrical Engineering and Computer Science of Kumamoto University in 1970 and is currently a Professor there. During 1983 to 1984 he was a Visiting Professor at the Polytechnic University Brooklyn NY. His research interests are in the areas of scattering diffraction and wave propagation in the theory of electromagnetics. Dr. Ikuno is a member of IEEE and IEE of Japan. Michim Gondo graduated from National Defense Academy Yokosuka in 1985 and received his M.E. from Kumamoto University in 1990. He is currently in the doctoral program at Kumamoto University. His research interest is in three-dimensional electromagnetic scattering. Masahiko Nkhimoto received his B.S. in Electronic Engineering from Kumamoto University in 1982 and an M.S. and Ph.D. from Kyushu University in 1984 and 1987 respectively. Since 1987 he has been a Research Associate in the Department of Electrical Engineering and Computer Science Kurnamoto University. His research interests are in the areas of scattering and diffraction of electromagnetic waves.

This paper shows that the surface current density can be calculated by using approximate total tangent magnetic vector fields which are expressed by finite number of linear combination of tangent vectors of spherical wave functions. Sampling points are determined by considering the property of associated Legendre functions and trigonometrical functions. By setting a number of sampling points to twice the largest mode number, a computer-aided algorithm is obtained. The accuracy of the solutions is checked and the polarization dependence of the surface current densities is clarified.

关键词： YASUURA METHOd 3-dIMENSIONAL PROBLEM BOdY OF REVOLUTION LEAST-SQUARES PROBLEM

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IMPROVEMENT OF CONVERGENCE SPEEd IN AdAPTIVE FILTER BY MULTIRATE PROCESSING

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ELECTRONICS ANd COMMUNICATIONS IN JAPAN PART III-FUNdAMENTAL ELECTRONIC science 1994年第5期77卷 19-27页

作者： KASHIMOTO, T TAKAHASHI, SI Faculty of Science and Technology Keio University Yokohama Japan 223 Shin-ichi Takahashi received his B.E. M.E. and Ph.D. degrees in Electrical Engineering from Keio University Yokohoma Japan in 1962 1964 and 1967 respectively. Currently he is a Professor of Electrical Engineering at Keio University. His research interests are in the areas of network and system theory. He is the author ofTheory of Circuit and Systemsand co-author ofExercises in Linear System Theory(Corona Co.)Basic Signal Theory(Jikkyo Co.) and other books.

Exact estimation of frequencies of sinusoidal signals corrupted by noise is an important problem in a variety of areas, and various kinds of methods for the solution of this problem have been proposed. Among these methods, the adaptive spectral estimation method, which processes data recursively, needs consideration of the convergence property of the adaptive filter as well as the precision of the spectral estimation. In this paper, we propose a method which improves the technique of analytic signal processing used to improve estimation precision slowing the convergence speed of the adaptive filters. This method makes good use of the data discarded by decimation and processes two series of the same statistics in parallel. By this operation, the number of times the coefficients are updated in the adaptive filter is doubled and, therefore, the rate of convergence is much improved. Furthermore, by increasing the number of data by interpolation of the observed data, faster convergence speed than that of the conventional method is realized. This method has an advantage of simple structure. It can be also easily applied to other adaptive filtering using subband filters.

关键词： AdAPTIVE FILTER SPECTRAL ESTIMATION MULTIRATE PROCESSING ANALYTICAL SIGNAL

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EVOLUTION ANd SERVICE REQUIREMENTS OF CBR APPLICATIONS ON ATM NETWORKS

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1994年第4期7卷 319-328页

作者： SHAH, SIA ASHTON, P WERNIK, M BNR P.O. Box 3511 Station C Ottawa Ontario Canada K1Y 4H7 Peter Ashton received the Bachelor of Science degree in electrical engineering from the University of Manitoba in 1987. He received a Master of Science degree from the same institution in 1989. Upon graduation he joined Bell-Northern Research where he studied the performance aspects of broadband networks including SONET frame relay and ATM systems. In 1994 he formed a new group to spearhead the investigation of performance requirements for BISDN services. Marek Wernik is Senior Manager Broadband Systems and Services in BNR Ottawa Canada. He received his M.Sc. and Ph.D. degrees in Electrical Engineering from Warsaw Technical University Poland in 1973 and 1978 respectively. Dr. Wernik worked as assistant professor at Warsaw Technical University and at Oran University of Technology Algeria conducting research in the fields of digital signal processing and radio communications measurement systems. In 1984 he joined BNR Advanced Technology group where he took part in the exploratory work on photonic and broadband switching and fibre network planning. Since then he has been working on various aspects of broadband networks and ATM systems. Between 1988 and 1990 he was a manager responsible for analysis and evaluation of traffic management and performance of ATM networks. As Senior Manager Dr. Wernik is currently responsible for broadband network design and planning in BNR's Systems Engineering Division. His responsibilities include in particular definition of management and control for ATM networks work with telecommunications carriers to identify requirements and plan deployment of broadband services and networks broadband product planning support and ATM Forum technical representation. Dr. Wernik is a Member of the IEEE Communications Society and has been actively involved in co-operation with Canadian universities supporting research in the field of broadband communications.

Broadband integrated networks based on asynchronous transfer mode (ATM) technology are being proposed to provide a single integrated access to a variety of services and applications. Constant bit rate services will form an important part of this unified networking solution. In this paper, we identify and describe the relevant aspects related to the implementation of CBR services on ATM. First, we identify two broad categories of potential CBR services for broadband ATM networks. The ATM infrastructure for the identified services is then developed along with the required functionalities of different network elements. Finally, end-to-end performance objectives for the ATM network are determined and verified empirically based on results of laboratory experiments. These performance objectives help us determine the minimum QOS required by the highest class of service category offered by an ATM network.

关键词： ATM AdAPTATION LAYER RESIdENTIAL SERVICES BUSINESS SERVICES

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ACQUISITION REFORM ANd BEST PROdUCT PROCUREMENT - AN engineering VIEW

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NAVAL ENGINEERS JOURNAL 1994年第6期106卷 41-57页

作者： FISHER, dA SKOLNICK, A He has been involved with several weapon system developments. Among these were the Trident II fire control and navigation systems the BSY-I Anti-Submarine Warfare System and the Navy standard computers (UYK44 and EMSP). He served as manager of the Digital Circuits Engineering Branch and was then appointed as manager of the Automatic Test Equipment (ATE) Technology Division. As manager of the ATE Technology Division he was responsible for the SP-23 Fire Control System Support Project the SP-24 Navigation Project and the Fleet Progressive Maintenance Program (2M/ATE). This Division was responsible for selection and application of electronic product technology and for developing fleet test and repair techniques. He holds a B.S. in Electrical Engineering from the University of Evansville and is currently pursuing a Masters of Public Administration at Indiana University-Purdue University Indianapolis. Dr. Alfred Skolnick:retired from the Navy in 1983 with the rank of captain. He is president of System Science Consultants (SSC) specializing in strategic planning technical program definition technology assessment and engineering analyses on selected matters of national interest. Dr. Skolnick taught mathematics and management sciences at University of Virginia and Marymount University. He is adjunct faculty at Northern Virginia Community College. From 1985 to 1989 he was president of the American Society of Naval Engineers. In the Navy he served at Applied Physics Laboratory/The Johns Hopkins University then aboard USSBoston(CAG-1) and played leading roles in several weapon system developments inertial navigation (Polaris) deep submergence (DSRV) and advanced ship designs (SES). He later was director Combat System Integration Naval Sea Systems Command and head Combat Projects Naval Ship Engineering Center. In 1975 he became a major project manager and led the Navy's High Energy Lasers Program in 1981 he was assigned all Navy Directed Energy Weapons development efforts. He was vice president advanced tech

The military services are being moved in the direction of performance-based specifications and standards. They are being steered against dictating ''how to'' produce an item since such action forecloses on the ability to gain access to components or technology that may have a commercial equivalent. Why should the engineering community embrace the new approach? Aside from the obvious weight of it being approved policy, therefore currently mandated, it warrants examination because it is the correct approach at this time when applied to appropriate products. Military specifications and standards are to be displaced then, by acceptable alternative contractor design solutions. Industry bidders will be allowed to propose the particular design details, permitting procurement flexibility by contractually citing only system level or interface requirements, both physical and functional. Hopefully, this can broaden the industrial base and increase competition with reduced costs to follow. Conceptually, the approach appears both performance-sensible and cost-attractive (there are, of course, consequent risks) but how does implementation proceed? Is it possible to pursue the goals envisioned along paths that are not in themselves experimental? Can the American postulate, minimal loss of life and limb to U.S. military people, continue to be honored? Experience and track record elsewhere imply encouraging possibilities in select situations-useful prospects are identified and discussed in practical terms.

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FINITE-ELEMENT METHOd SOLUTIONS OF FIELd dISTRIBUTIONS IN LARGE CAVITIES

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INTERNATIONAL JOURNAL OF NUMERICAL MOdELLING-ELECTRONIC NETWORKS dEVICES ANd FIELdS 1994年第5期7卷 343-355页

作者： THARF, MS COSTACHE, GI University of Ottawa Ottawa Ontario Canada KIN 6N5 Mohammed S. Thad received the B.Sc. in electrical engineering in 1984 from the University of Jordan Amman Jordan. From September 1984 to December 1985 he was a teaching and research assistant at Yarmouk University Irbid Jordan. In January 1986 he joined the Telecommunications Corporation Amman Jordan and was a planning and design engineer till December 1990. He received the M.Sc. in electrical engineering in June 1989 from the Jordan University of Science and Technology Irbid Jordan. Since early 1991 he has been working towards his Ph.D. degree at the Department of Electrical Engineering University of Ottawa Ottawa Ontario Canada. He is the president and delegate of the Graduate Students Association—Electrical Engineering and the graduate students' representative in the departmental council of electrical engineering. His current research interest is in developing numerical methods for practical EMI/C applications. These involve EMP interaction electromagnetic coupling radar cross-section and the cross-talk phenomenon on PCB and VLSI. The author or coauthor of over 50 technical papers and reports Dr Costache is an Associate Editor of theIEEE Transactions on Electromagnetic Compatibility. He is also a member of the editorial review board ofCOMPEL theInternational Journal for Computation and Mathematics in Electrical and Electronics Engineering International Journal of Numerical Modelling Electronic Networks Devices and Fields andIEEE Transactions on Microwave Theory and Techniques. He is a registered Professional Engineer in the province of Ontario Canada.

To make possible the application of the three-dimensional finite element method to electrically large problems, it is combined with the analytical solutions of arbitrary large cavity with aperture. In this paper, detailed analysis for this hybrid method is presented. The element matrices necessary for coupling the finite element method to analytical solutions are given. The proposed hybrid method significantly reduces the number of unknown since only the inhomogeneity needs to be discretized. Thus computer memory and storage demands are reduced. In addition, this hybrid method employs the edge element which is not expected to produce spurious solutions. Also, the formulation presented in this paper preserves the sparsity of the finite element matrix, and does not require any matrix inversion. This new hybrid method is used to compute the field distributions in various partially filled rectangular enclosures. The results match well with the pure edge-based finite element method and analytical solutions.

关键词： Electric fields

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TECHNICAL ISSUES REGARdING SATELLITE PACKET-SWITCHING

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 257-267页

作者： IVANCIC, Wd CHU, P SHYY, dJ National Aeronautics and Space Administration Lewis Research Center Cleveland Ohio 44135 USA. A design engineer in the Digital Technology Branch of the Space Electronics Division. He has extensive experience in satellite communications systems modulation and coding on-board switching and routeing and high speed digital design. Since joining NASA in 1982 Mr. Ivancic has been responsible for the development of a variety of matrix switch controllers ground terminal equipment numerous pieces of special test equipment a beacon controller for the SARSAT program (Search and Rescue Satellite) and a time-shared decoder for a processing satellite. In addition Mr. Ivancic has been technical contract monitor on a number of advanced communications technology contracts including the Advanced Modulation Technology Development a 5 GHz fibre-optic link and multi-programmable modem study. He was awarded the B.S.E.E. and M.S.E.E. degrees by Cleveland State University in 1982 and 1986 respectively. Cleveland State University Cleveland Ohio 44115 USA. Currently an assistant professor of Electrical Engineering Department at Cleveland State University. He obtained the M.S. and Ph.D. degrees from Iowa State University majoring in Electrical and Computer Engineering. His research interests include high-speed computer networks digital systems and neural networks applications. He is a member of Sigma Xi Phi Kappa Phi as well as the IEEE and ACM. ComSearch Reston Virginia 22091 USA. Received the B.S. degree in electrical engineering from National Chiao-Tung University Hsin-Chu Taiwan in 1983 and the M.S. and Ph.D. degrees in electrical engineering from Georgia Institute of Technology Atlanta GA in 1986 and 1990 respectively. From June 1987 to October 1987 he worked for the Department of Neurology Emory University Atlanta as a Programmer. From September 1989 to December 1989 he worked for the Advanced Development Laboratory. AMP Inc. Atlanta as a Test Engineer. From February 1990 to August 1993 he wor

Many concepts for advanced communication satellite networks have recently been proposed. Critical technical issues relating to satellite packet switching for meshed very small aperture terminal networks and broadband ... 详细信息

关键词： FAST PACKET SWITCH BISdN MESHEd VSAT ON-BOARd PROCESSING

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A LAPLACE dOMAIN FINITE-ELEMENT METHOd (LdFEM) APPLIEd TO dIFFUSION ANd PROPAGATION PROBLEMS IN ELECTRICAL-engineering

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INTERNATIONAL JOURNAL OF NUMERICAL MOdELLING-ELECTRONIC NETWORKS dEVICES ANd FIELdS 1994年第6期7卷 419-432页

作者： CAI, Xd COSTACHE, GI Department of Electrical Engineering University of Ottawa Ottawa Ontario KIN 6N5 Canada Xiao-Ding Cai received the B.E. degree in 1982 and M.E. degree in 1987 both from Beijing University of Posts and Telecommunications Beijing China. From 1982 to 1984 he worked in the Fifth Research Institute of Posts and Telecommunications Chengdu Sichuan China. In 1987 he joined the academic staff of the Department of Microwave Engineering at the University of Electronics Science and Technology of China Chengdu. He has been working towards the Ph.D. degree in the Department of Electrical Engineering University of Ottawa Ottawa Ontario Canada since 1990. His current research interests include numerical modelling of transient phenomena in EM problems and VLSI interconnects. George I. Costache is a Professor in the Electrical Engineering Department at the University of Ottawa Ottawa Ontario Canada. His career has included positions at Bell Northern Research Ottawa Ontario at the University of Manitoba and at the Polytechnic Institute of Bucharest. He has taught electromagnetics and numerical techniques applied to electromagnetics for more than 26 years and has made original contributions to the solution of skin-effect problems and electromagnetic transient phenomena. His main interest is in numerical techniques such as finite element analysis and moment methods and their application to interference problems in steady-state and time-domain applications. The author or coauthor of over 90 technical papers and reports Dr Costache is an Associate Editor of theIEEE Transactions on Electromagnetic Compatibility. He is also a member of the editorial review board ofCOMPEL theInternational Journal for Computation and Mathematics in Electrical and Electronics Engineering theInternational Journal of Numerical Modelling Electronic Networks Devices and FieldsandIEEE Transactions on Microwave Theory and Techniques. He is a registered Professional Engineer in the province of Ontario Canada.

This paper presents a new finite element formulation in the Laplace domain for both diffusion and wave equations with applications in the field of electrical engineering. With the aid of congruence transformation of matrices, the finite element equations in the Laplace domain are solved and time-domain results can be obtained through the inverse Laplace transform. In a test problem, good agreement between the numerical results derived with the present method and the analytical solutions has been found. For applications in which only dirichlet and Neumann boundary conditions are involved, this new finite element approach can be applied and provide both frequency-domain and time-domain results in one run without any timestepping scheme. The limitations of using the congruence transformation in solving propagation problems are also addressed in this paper.

关键词： Finite element method

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MATERIALS ASPECTS OF dAMAGE TOLERANCE ANd RELIABILITY OF SHIP STRUCTURES ANd COMPONENTS

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NAVAL ENGINEERS JOURNAL 1994年第4期106卷 192-207页

作者： KHAN, MZS SAUNdERS, dS BURCH, IA MOURITZ, AP Dr. M. Z. Shah-Khan: currently a research scientist received his Bachelor of Engineering degree in Mechanical Engineering from Osmania University India in 1978. He took postgraduate work at Iowa State University receiving an M.S. degree in Metallurgy in 1981. In 1983 he joined University of New South Wales Australia and obtained the Doctor of Philosophy degree in Metallurgy in 1986. In 1986 he assumed his present position where he has been active in the research of fatigue and fracture of high strength naval construction steels in support of the Naval Ship Structure Research Program. His recent work has been in the development and application of techniques for the measurement of residual stress during the fabrication of a submarine hull. Dr. D. S. Saunders: B. Appl. Sc. (Hons) Adelaide Ph.D. Monash is a principal research scientist and has been involved in research into the fatigue and fracture behaviour of steels and aluminum alloys. He has worked on the development of fracture toughness specimens for artillery projectiles and rocket motors and has undertaken development and application of elastic-plastic fracture toughness techniques to high strength steels for military applications. More recently he has studied the fatigue behaviour of carbon fibre composite laminates for aircraft applications. Present research involves the application of composite materials to naval structures and the development of fracture mechanics methods which can predict fracture properties in materials under high rates of loading. Dr. Saunders is a member of the Institution of Engineers of Australia and is affiliated with the Materials Society and the Composite Structures Society of the IEAust. Mr. Ian A. Burch: Dip. Appl. Sci. in Sec. Metallurgy Royal Melbourne Institute of Technology is an experimental officer and is involved in assessing the fracture properties of high strength hull steels for ship and submarine use. He is currently involved in developing the crack arrest fracture toughness test for assessing the dynami

The design and development process prior to the fabrication of maritime structures such as merchant ships, naval surface ships and submarines include the specification of a range of materials required to perform under most adverse conditions of environment and operational loads. The damage tolerance and reliability of such structures can only be assured through appropriate materials selection, application of regorous testing methodologies and through-life inspection and monitoring. The importance of the consideration of damage tolerance and reliability of maritime structures can be gauged by the consequences of in-service failures;for example, the break-up of merchant ships resulting in environmental disasters, loss of lives and wartime damage of naval ships and submarines. Factors that lead to service failures include corrosion, fatigue, corrosion fatigue, low toughness and poor design, and often these factors occur in combination. The range of materials used in maritime structures is diverse and includes mild steel (ship) plate, micro-alloyed steels, aluminium alloys and monolithic and foam sandwich glass fibre laminates. These materials all have different responses to the environmental and loading conditions and consequently extensive materials testing programs are necessary to put damage tolerance and reliability indicators in place. This paper addresses the materials and testing aspects of damage tolerance and reliability assessment of maritime structures, and deals broadly with corrosion and corrosion fatigue testing;fracture toughness testing;measurement of residual stresses within the structure;damage assessment and life calculations. The paper discusses testing methodologies that obtain essential property data for various materials under a range of environmental and loading conditions. The paper briefly addresses the application of property data to the prediction of the behavior of maritime structures and components as well as application to life prediction

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HYBRId SATELLITE ANd TERRESTRIAL NETWORKS

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 313-327页

作者： CHITRE, dM SHYY, dJ EphREMIdES, A GUPTA, S COMSAT Laboratories 22300 Comsat Drive Clarksburg MD 20871–9475 USA. Received his B.Sc. from the University of Bombay India an M.A. in mathematics from the University of Cambridge U.K. and a Ph.D. in physics from the University of Maryland. He is currently an Associate Executive Director of the Network Technology Division at COMSAT Laboratories. He has been involved in research and development activities in ISDN VSAT networks data communications and network systems and architectures. Prior to his current positions Dr. Chitre was a Principal Scientist in the Network Technology Division at COMSAT Laboratories. Dr. Chitre joined COMSAT Laboratories in 1980. He has made major contributions to the analysis and architecture of data communication ISDN and BISDN via satellite. Dr. Chitre directs and participates in the international and national standards activities in ISDN BISDN and data communication as they apply to satellite communication. He was Chairman of the Working Group on Protocols and Network Timing Function of the CCIR/CCITT Joint Ad Hoc Group on ISDN/Satellite Matters during 1990–1992. Currently he is the Chairman of the Working Group on New Technologies in the ITU Intersector Coordinating Group (ICG) on Satellite Matters. Dr. Chitre was a programme manager during 1990 and 1991 on a contract from INTELSAT on systems studies on satellite communications systems architectures for ISDN and broadband ISDN systems. Currently he is the technical manager of the DoD Contract on ATM via satellite demonstration and the programme manager for the INTELSAT contract on analysis and top-level specification of INTELSAT ISDN subnetworks and SDH compatible transport network. Received the B.S. degree in electrical engineering from national Chiao-Tung University Hsin-Chu Taiwan in 1983 and the M.S. and Ph.D. degrees in electrical engineering from Georgia Institute of Technology Atlanta GA in 1986 and 1990 respectively. From June 1987 to October 1987 he worked for the Department of Neurology Emory Univers

The role of satellite communications in networks that provide new services, such as frame relay and multimedia, is investigated. Both passive and active (on-board switching/processing) satellite systems are considered. Novel techniques are developed for each system to demonstrate, via detailed analysis and simulation, how the communications bandwidth agility of multipoint/broadcast satellite channels, and the on-board switching/processing, makes it feasible to provide these new services via hybrid satellite and terrestrial networks in a resource-efficient manner.

关键词： HYBRId NETWORKS ON-BOARd PROCESSING FRAME RELAY

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