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Horizontal and vertical well comparison for in situ air sparging

GROUND WATER MONITORING AND REMEDIATION 1997年第1期17卷 91-96页

作者： Plummer, CR Nelson, JD Zumwalt, GS Charles R. Plummer holds a B.S. in civil engineering and an M.S. in environmental engineering and water resources from Louisiana Tech University. Plummer is employed by Perry Pyron & McCown Consultants Inc. in Monroe Louisiana (2.508 Ticheli Rd. Monroe LA 71202) where he is responsible for remediation systems design and analysis and environmental application research. Before entering Louisiana Tech in 1989 Plummer served eight years as a drilling supervisor for an oil and gas exploration company. After receiving his B.S. degree in 1993 he worked as a graduate assistant for the Trenchless Technology Center under the guidance of Dr. Tom Iseley and Dr. James Nelson. James D. Nelson is associate dean for academic affairs College of Engineering and professor of civil engineering at Louisiana Tech University (Dept. of Civil Engineering LTV Ruston LA 71270). He received his Ph.D. from Colorado State University and his research interests are in ground water model-ing and remediation. Gary S. Zumwalt is associate professor of geosciences at Louisiana Tech University (Dept. of Geosciences LTU Ruston LA 71270). He received his Ph.D. from the University of California-Davis and his research interests are environmental geology and ground water remediation.

A laboratory study was conducted to determine the effectiveness of vertical and horizontal well configurations for ground water remediation using in situ air sparging. A lexan tank was designed and constructed to allow both the visualization of air flow and quantitative measurement of the distribution of air flow. Two media, sand and glass beads, were tested with both vertical and horizontal air sources. In each case, most of the air traveled through preferential channels as continuous flow rather than as discrete bubbles as reported in other studies. Even though glass beads were selected to have the same grain-size distribution as the sand, air flow was quite different through the two media. Results show that glass beads are not a suitable material for modeling air flow through natural sediments. In this study, the horizontal well proved to be more effective than the vertical well by impacting more of the media with a uniform distribution of air through-out the media. The vertical well resulted in a nonuniform distribution of air flow with most of the air concentrated directly above the well.

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The Regional Deterrence Ship (RDS 2010) - A design for littoral warfare in the 2010 timeframe

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NAVAL ENGINEERS JOURNAL 1996年第1期108卷 61-72页

作者： Calvano, CN Riedel, JS Professor Charles N. Calvano Capt. USN (Ret.): of the Naval Postgraduate School is responsible for a program in Total Ship Systems Engineering. He is a graduate of the Naval Academy who served as a surface warfare officer. After completion of his graduate education at MIT he became an Engineering Duty Officer and served at Boston Naval Shipyard in several capacities. He was the Repair Facilities Advisor to the Vietnamese Navy the Project Officer for construction of nuclear powered guided missile cruisers (CGNs) at the Supervisor of Shipbuilding Newport News Virginia and served on the staff of the Commander Naval Surface Forces U.S. Atlantic Fleet and later at the Supervisor of Shipbuilding in Portsmouth Virginia in maintenance and overhaul management positions. He was Officer in Charge of the Annapolis Laboratory of the David Taylor Research Center and Commanding Officer of the Engineering Duty Officer School. He retired from active duty in October 1991 after serving in the Naval Sea Systems Command as the Director of the Ship Design Group and of the Advanced Concepts and Technology Group. Lt. Jeffrey S. Riedel USN:is an Engineering Duty Officer currently assigned to the Supervisor of Shipbuilding Bath Maine. He obtained his B.S. degree in Marine Engineering from Maine Maritime Academy in 1986 and his M.S. degree in Mechanical Engineering plus a Mechanical Engineer's degree from the Naval Postgraduate School in 1993. Lt. Riedel's naval career has included duty aboaqrd USS Wainwright (CG 28) as auxiliaries officer damage control assistant and main machinery officer. Currently he serves as the assistant production officer at SUPSHIP Bath in charge of DDG 51 class construction and delivery.

This paper describes the design of a Regional Deterrence Ship (RDS 2010) for the 2010 timeframe. The requirements for the design were for a ship to operate in littoral areas of the world with a mission of deterring regional conflicts and of hampering the efforts of the aggressor in such a conflict. In addition the ship's mission included the evacuation of friendly personnel as hostilities become likely. The problem countering the littoral threat during times of constrained budgets is addressed. Top level requirements for the design, generated in parallel with ''.... From the Sea'' [1], were used to set the design goals. The paper describes the manner in which littoral warfare changes the nature of the challenges faced by Navy surface combatants, including a ship such as the RDS 2010. A number of factors become more crucial design concerns than for blue water ships, including reduced reaction times, likelihood of attack from hidden land sites, shallow water mines and shallow water USW Certain other factors become less critical in littoral areas and this also has ship design impacts. While some present ship designs can perform some of the tasks needed in a littoral warfare/regional conflict environment, none represents a completely integrated design (hull, mechanical & electrical;combat systems;fiscal and manning constraints;reduced vulnerability;robust self-defense etc.) for a vessel stationed in waters that, without warning, can become hostile. After describing the mission requirements to which the RDS 2010 was designed, the paper discusses the controlling design philosophy and decisions and describes the process used to assess threats to the ship. The process of combat system selection, against the backdrop of expected threat scenarios, is described and the intended approach to integration of the combat system is discussed. In recognition that decreased reaction times and surprise attacks are likely to threaten a ship engaged in regional deterrence, discussions oi

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ISDN LOOP EXTENSION USING A MID-SPAN AMPLIFIER

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INTERNATIONAL JOURNAL OF COMMUNICATION systems 1995年第3期8卷 219-224页

作者： ERKER, GJ DODDS, DE KRZYMIEN, WA David E. Dodds was born in Saskatoon Canada in 1945. He received the B. Eng. and MSc. degrees from the University of Saskatchewan in 1966 and 1968 respectively. He worked with Bell Northern Research (Ottawa) on PBX design in 1969 1972 and 1978. Since 1969 he has been with the University of Saskatchewan where he is currently Professor of Electrical Engineering. He teaches courses in electronics and communications and also presents short courses on the fundamentals of telephony. Current research interests are in data transmission signal processing architecture and frame synchronization for PCM and spread spectrum systems. He has been granted five patents relating to commercial products in delta-modulation telephone line interfacing and computer data transmission. In 1986 he was on sabbatical leave at BNR Inc. and worked with an ANSI committee on the standardization of FDDI-II a combined voice and data system. Mr. Dodds is a Registered Consulting Engineer in Saskatchewan. Witold A. Krzyden received his MSc. (Eng.) and Ph.D. degrees (both in Electrical Engineering) in 1970 and 1978 respectively from the Poznan Technical University in Poznan Poland. He was awarded the Minister's of Science and Technology Prize of Excellence for his Ph.D. thesis. From 1970 to 1978 he was a Research Engineer and Teaching Assistant and then from 1978 to 1980 an Assistant Professor of Electrical Engineering at the Poznan Technical University. In 1980 he won a Dutch Government Research Fellowship at the Twente University of Technology in Enschede the Netherlands for the year of 1980/1981. In the following year of 1981/82 he was a Research Assistant Professor there. From 1982 to 1986 he was an Assistant Professor of Electrical Engineering at Lakehead University in Thunder Bay Ontario Canada. In 1986 he joined the Univeristy of Alberta and Alberta Telecommunications Research Centre (now Telecommunications Research Laboratories or TRLabs) as an Associate Professor of Electrical Engineering. Currently he is a Professor of E

The 5.5 km range of the basic rate ISDN loop has been extended by using a negative impedance amplifier and by using a 2 wire/4 wire (2w/4w) amplifier. The negative impedance amplifier extends the range of the loop by 1.0 km, whereas the 2w/4w amplifier extends the range by 1.5 km at the expense of increased complexity. As part of the amplifer design, a resistor/capacitor network has been developed which closely matches the characteristic impedance of telephone cable. Error rate tests have been conducted using various lengths of cable and an operating ISDN line.

关键词： ISDN PHYSICAL LAYER BASIC RATE LOOP RANGE EXTENSION

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PARALLEL AND DISTRIBUTED TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

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Calculation of the temperature distribution in an asynchronous machine

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European Transactions on Electrical Power 1995年第3期5卷 181-186页

作者： Xypteras, J. Maras, K. Spyrelis, D. Associate Professor Dr.-Ing. Jannis Xypteras (1937) Director of the Electrical Machines Laboratory Dept. of Electrical Engineering Aristotle University of Thessaloniki (AUT)/Greece graduated from the Fakultatfur Elektrotechnik of the RWTH AachedGermany. During the years 1965 to 1980 he had been employed in German and Greek factories for electrical machines several years as chief of development departments. In 1978 he obtained his Dr. Electr. Eng. degree in the AUT. His subject was in the area of eddy currents. Since 1984 he is Ass. hofessor in the same University. His special interests: Design and development of electrical machines vibration and noise problems electromagnetic fields eddy currents. (Dept. of Electrical Engineering Aristotle University GR-54006 Thessaloniki/Greece T +30 3 1 I99 62 93 Fax +303 11 99 63 02) Kostas Maras (1966) received his degree in Electrical Engineering from the Electrotechnical Faculty of Aristotle University of Thessaloniki/Greece in 1989. In 1990 he graduated as M.Sc. in Digital Electronics in the King's College London at the University of LondordGB with the project “Design of a Transversal Filter on VLSI CMOS”. Since then he has been working at M. Papasavas S.A. at KallithedGreece as an analyst in developing industrial software. Projects: Design and implementation of a dynamic relational model used to tackle production problems in industry. From 1991 to 93 he was responsible for the development of production planning used in industries. (M. Papasavas S.A. Sofocleus 261 GR-17874 KallithedGreece T +30 119423246 Fax +30 1/9429561) Dimitrios S. Spyrelis (1965) received his Diploma in Electrical Engineering from the University of Thessalonikil Greece in 1989. In 1990 he joined the Coding Center of Greek Army as research Assistant. He is currently working as technical director in a pigpoultry breeding company which includes feed processing industry slaughter houses by product process industry wastes treatment systems from farm livestock. His last fields of interest

In this paper the temperature distribution on the section vertical to the axis of an asynchronous machine is calculated. For the calculation the numerical method of “Control Volumes” has been used. The technique used can be easily modified to fit any kind of machine. It can also analyse transients. Copyright © 1995 John Wiley & Sons, Ltd.

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Making design Everybody's Job: The Warship design Process

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Naval Engineers Journal 1995年第3期107卷 283-301页

作者： Tibbitts, Capt. Barry Keane, Robert G. Capt. Barry Tibbitts USN (Ret.):received a B.S. degree from the U.S. Naval Academy and both an M.S.M.E. and a Nav.E degree from MIT. He served Jive years at sea in the Atlantic Fleet on an aircraft carrier and in two submarines (gunnery officer and chief engineer in one submarine operations officer and chief engineer in the other). His early assignments as an Engineering Duty Officer were in the Pacific Fleet and included SRF Yokosuka. CINCPACFLT staff and an advisor to the South Vietnamese Navy. Later he was Deputy tor Submarines at SUPSHIP Pascagouia. where for five years he supervised construction or overhaul of nine nuclear attack submarines and five surface ships. Washington assignments included CVV ship design manager director of NAVSEC's Hull Division and SECNAV staff. During two 3-year tours he directed the NAVSEC Ship Design Division and its successor the NAVSEA Ship Design Group. He was also Commander of the David Taylor Research Center where he played a key role in gaining approval for the Large Cavitation Channel (LCC). Following statutory retirement he was recalled to active duty to serve as Professor of Naval Construction and Engineering at MIT for three years. During his career he received seven personal decorations including two aivards of the Legion of Merit. Currently he is the Chief Systems Engineer for John J. McMullen Associates. He is a member of ASNE and SNAME and an overseas Fellow of RINA. He teaches at the NAVSEA Institute and DSMC and remains on the MIT faculty as a Senior Lecturer Robert G. Keane Jr.:received a B.E.S. degree from The Johns Hopkins University an M.M.E. degree from Stevens institute of Technology and an M.S.E. degree in Naval Architecture and Marine Engineering from the University of Michigan. He began his Navy career in 1967 as a hydrodynamicist in the Surface Ship Dynamics Branch of the David Taylor Model Basin. After completing the EIT program in NAVSEC's Hull Division in 1968 he moved to the Ship Arrangements Branch. Between 1971–1981 he was suc

ABSTRACT The authors (and the late Bob Riggins) published a paper for ASNE Day 1988 (1) entitled, “Naval Ship design—Evolution or Revolution?” The authors predicted that a revolution in naval ship design was possible. In the intervening years has a revolution in fact occurred? Or even gotten closer? In 1990, NAVSEA's Chief Engineer initiated the Ship design, Acquisition and Construction (DAC) Process Improvement Program. The DAC process improvements are revolutionizing warship design by making design everyone's job. This paper discusses current initiatives such as: Concurrent engineering: Integrated product and process development teams, collocated physically or electronically, employing a new design methodology to harness the true power of multi‐functional teams. systems engineering: A top‐down integration of combat/weapon systems and HM&E systems into a total warship system. Transition of New Technologies: Assessing and integrating emerging technologies with new ship designs. Modeling and Simulation (M&S): Simulation based design/virtual prototypes, 3‐D digital product models, and CAD/CAM/CAE. How these concepts are being applied to the early 1990s designs of CVN 76 and LPD 17 is described in this paper. The potential for truly revolutionary changes for future ship designs just getting underway is also discussed. One guiding principle that remains unchanged is the leadership role of NAVSEA's design engineers. © 1995 by the American Society of Naval Engineers

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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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GPS SYNCHRONIZED POWER-SYSTEM PHASE-ANGLE MEASUREMENTS

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第5期12卷 499-505页

作者： WILSON, RE STERLINA, PS Department of Electrical Engineering University of Wyoming Laramie WY 82071 USA. Worked as a power systems engineer from 1980 to 1990 and during the summer of 1992 for the Western Area Power Administration U.S. DOE. His job assignments included relay settings technical analysis time-keeping networks and major equipment commissioning. Bob Wilson is currently the Nicholson Visiting Assistant Professor at the University of Wyoming. His research interests include power system control through real-time measurements and applications of precise timekeeping. He is a member of the IEEE Power Engineering Society and is helping to co-ordinate the Precise Measurements in Power Systems Conference. Macrodyne Inc. Clifton Park NY 12065 USA. Engineering Manager for Macrodyne Inc. Clifton Park NY. Mr Sterlina has been involved in the conception and design of transient recording devices for both transmission and distribution applications. He has been responsible for developing several versions of digital recording instruments and programs for utility applications and managed development of the 1690 and 1692 phasor measurement and integrated recording units. He is a member of the Power Engineering Society and a PSIT working group on the application of Digital Techniques in Electrical Measurement.

Before a major new 500 kV transmission line was placed in service between Oregon and the San Francisco, California area, a series of high-voltage short circuit tests were performed on the transmission system. The short circuit faults produced a brief 'delta function' shock to the regional power system. This paper discusses the use of Global Positioning System (GPS) synchronized equipment for the measurement and analysis of key power system quantities. Before the testing, the authors installed two GPS synchronized phasor measurement units (PMUs). The PMUs use GPS to globally synchronize the measurement of the state vector of the power system, the complex voltages of substation busses. Complex voltage means the magnitude and the relative phase angles of substation voltages. GPS provides the global time reference marker for phase angle measurement. One electrical degree of the 60 Hz waveform equals about 46 mus. Across short transmission lines (less than 50 km), measurements may need to be made to 0.1 electrical degree, which translates to clock synchronizations of roughly 5 mus. The PMUs recorded the dynamic response of the power system phase angles when the northern California power grid was excited by the artificial short circuits. Power system planning engineers perform detailed computer generated simulations of the dynamic response of the power system to naturally occurring short circuits, e.g. faults caused by lightning. The computer simulations use models of transmission lines, transformers, circuit breakers, and other high voltage components. This work will compare computer simulations of the same event with field measurements.

关键词： POWER SYSTEM PHASE ANGLE STAYED FAULT TESTS

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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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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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