检索结果-内蒙古大学图书馆

PERFORMANCE OF A PRIORITIZED ON-bOARD b.s.bAND sWITCH FOR A MULTIsERVICE MULTIbEAM sATELLITE

INTERNATIONAL JOURNAL OF sATELLITE COMMUNICATIONs 1994年第3期12卷 283-297页

作者： bOHM, s ELHAKEEM, AK HACHICHA, M Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada An Associate Director of Advanced Technology & Networks Group VISTAR Telecommunications Inc. Ottawa Canada. He is also an Adjunct Pr

In this paper, we study the performance of a prioritized on-board b.s.band switch in conjunction with a multibeam satellite handling integrated services. The services considered for the analysis include voice, video, file transfer and interactive data. The prioritized switch uses both input and output buffering, switch speed-up as well as a two-phase head-of-line resolution algorithm, in order to reduce the buffer loss while maintaining acceptable user delays. The minimum required buffer capacity and switch speed-up for each service in a prioritized environment are found under uniform traffic conditions. It is shown that under uniform traffic conditions, only minimal buffering and switch speed-up are needed even for the lowest priority users. The performance dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environment.

关键词： sWITCH ON-bOARD b.s.bAND MULTIbEAM PRIORITIZED HEAD-OF-LINE UNIFORM LOAD sPEED-UP

来源：评论

学校读者我要写书评

暂无评论

HYbRID sATELLITE AND TERREsTRIAL NETWORKs

引用

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

来源：评论

学校读者我要写书评

暂无评论

ANALYsIs OF A MOVAbLE bOUNDARY ACCEss TECHNIQUE FOR A MULTIsERVICE MULTIbEAM sATELLITE system

引用

INTERNATIONAL JOURNAL OF sATELLITE COMMUNICATIONs 1994年第3期12卷 299-312页

作者： bOHM, s ELHAKEEM, AK MURTHY, KMs HACHICHA, M KADOCH, M Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada . He is ITU's Specialist Consultant and Chief Advisor for a number of ITU/UNDP projects including VSATs Rural Networks Digital Broadc

In this paper, the performance of a new movable boundary accessing (MbA) technique for future integrated services multibeam satellite systems is studied. The multiservice environment considered includes both asynchronous and isochronous traffic consisting of video, voice, file transfer and interactive data. The movable boundary access technique proposed here will maximize the utilization of the up-link frame capacity. It is shown that the potential user population is substantially increased with the use of a moving boundary policy with minimal overhead.

关键词： MOVAbLE bOUNDARY ACCEss TECHNIQUE MF-TDMA DAMA MULTIbEAM sATELLITE

来源：评论

学校读者我要写书评

暂无评论

AN ENVIRONMENTALIsTs PERsPECTIVE ON ALTERNATIVEs TO PUMP AND TREAT FOR GROUND-WATER REMEDIATION

引用

GROUND WATER MONITORING AND REMEDIATION 1993年第4期13卷 92-94页

作者： ROss, DL Lauren Ross is an engineer and consultant on environmental and statistical projects. She has a B.S. M.S. and Ph.D. in civil engineering. Dr. Ross has 15 years of engineering experience particularly in the design of ground water monitoring systems data analysis computer modeling and computer program development. She has also worked on non-point source pollution assessment for storm water runoff. In addition to industry and governmental clients Dr. Ross provides engineering consulting to environmental groups including Save Barton Creek Association and the SOS Coalition in Austin Texas.

来源：评论

学校读者我要写书评

暂无评论

COMbAT system engineering - A RETURN TO FUNDAMENTALs

引用

NAVAL ENGINEERs JOURNAL 1993年第3期105卷 61-69页

作者： MITTURA, A KARP, Ms PE Andrew Mittura:is currently a senior program engineer with SYSCON Corp. He began his career in the Combat System Installation and Integration Office of NavSea in 1978. He has worked as a system engineer on the Seafire program at NSWCDD on the NATO Anti-air Warfare Program while at FMC Corporation and for the past four years on the Aegis Combat System with SYSCON. Current efforts include performance assessment studies of the Aegis combat system and combat system architecture and connectivity analysis. Mr. Mittura received a B.S. in electrical engineering from Penn State University in 1978 and an M.S. in engineering management from Catholic University of America in 1982. He is a licensed professional engineer with the State of Virginia. Mitchel S. Karp:cofounded K&K Software Engineering Inc. in February 1970. He is currently secretary/treasurer and senior system engineer. His involvement in combat systems began with NTDS in 1963. He has been involved in the Aegis Program since 1968 and has worked in all aspects of combat system development including computer programming tactical analysis software development and management. He has given several seminars on real-time software development and documentation. He currently is working under contracts to NSWCDD in the areas of combat system architecture and connectivity configuration management and documentation. Mr. Karp received a B.S. in engineering physics from Lehigh University in 1958.

The Navy's focus has shifted from global war scenarios to preparedness for the prospect of involvement in regional, littoral contingencies and conflicts. Operationally, shipboard personnel will need the ability to shift focus from the combat system multimission roles to that of only a single mission. From a development perspective, combat systems must accommodate a continual infusion of technology in a budget constrained environment. Combat system architecture is the single most important feature affecting combat system flexibility, from both an operational and developmental aspect. There is a fundamental partitioning of combat svstem functions into detect, command, and engage in a horizontal integration approach that enhances this needed flexibilitv. This fundamental partitioning is currently applied to individual weapon systems, but not to combat svstems as a whole. Instead, self-contained weapon systems are often developed and then vertically integrated to form a combat svstem, causing reduced flexibility. The battle organization is the principal driving requirement for combat system architecture. This paper shows that that the battle organization is b.s. supported by a horizontally integrated combat system of detect, command, and engage. It concludes that a horizontally integrated combat svstem architecture of detect, command, and engage should be a candidate for future combat systems.

关键词：

来源：评论

学校读者我要写书评

暂无评论

NUMERICAL-sIMULATION OF CURRENT-VOLTAGE CHARACTERIsTICs OF sILICON PHOTOCONDUCTIVE CIRCUIT ELEMENTs

引用

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKs DEVICEs AND FIELDs 1993年第3期6卷 221-231页

作者： sHAKOURI, H LIOU, JJ Electrical and Computer Engineering Department University of Central Florida Orlando FL 32816 U.S.A. Juin J. Liou received the B.S. (Honours) M.S. and Ph.D. degrees in electrical engineering from the Univeristy of Florida Gainesville in 1982 1983 and 1987 respectively. HIs doctoral research with Dr F. A. Lindholm involved the characterization of the space-charge region of semiconductor junction devices. From 1985 to 1986 he was an Instructor in the Department of Electrical Engineering at the University of Florida. In 1987 he joined the Department of Electrical Engineering at the University of Central Florida Orlando where he is now an Associate Professor. His current research interests are in CAD tool development circuit simulation and modelling semiconductor devices including homojunction bipolar transistors heterojunction bipolar transistors junction field-effect transisstors solar cells and photoconductivity siwtching devices. Dr Liou has published more than 100 technical papers in refreed journals and international and national conference proceedings. He has served as a technical reviewer for several journals and conferences as well as an associate editor for theSimulationjournal under the area of VLSI and circuit simulation. His honours and awards include: Outstanding Young Men of American in 1987 Distinguished Researcher Award Electrical Engineering Department University of Central Florida in 1988 1989 and 1991 Distinguished Researcher Award College of Engineering University of Centeral Florida in 1991 Engineer of the Year IEEE Orlando Section 1992 Eminent Engineer Tau Beta Pi 1992. In the summer of 1992 Dr Liou worked at Solid State Laboratory Wright-Patterson Air Force Base Ohio as a Summer Research Faculty sponsored by the Air Force Office of Scientific Research.

Photoconductive circuit elements (PCEs) are suitable for switching applications: they can be turned on and off rapidly, they can conduct a large current in the 'on' state when applying a laser or other optical excitation containing high energy photons exceeding the silicon band gap energy, they have a large resistance in the 'off' state when the light is off, and they can be fabricated using a simple process. We report the steady-state characteristics of PCEs simulated from a two-dimensional simulator called PIsCEs-2b. The effects of the conducting channel length, the resistivity of the intrinsic silicon, and the type of contact region on the performance of the PCE will be investigated and discussed. b.s.d on the simulation results, optimal PCE device make-ups will also be suggested.

关键词： Photoconducting materials

来源：评论

学校读者我要写书评

暂无评论

sHIPs sERVICE ELECTRIC-POWER - ENHANCED sURVIVAbILITY VIA EARLY DETECTION OF INCIPIENT CAbLE FAULTs

引用

NAVAL ENGINEERs JOURNAL 1993年第3期105卷 78-84页

作者： WILLIAMs, sE RUssELL, bD Stephen E. Williams:graduated summa cum laude from Texas A&M University with a B.S. degree in electrical engineering in 1991. He is still at Texas A&M while completing an M.S. in E.E. with special interest in low voltage (less than 600 V) network protection. Mr. Williams is a National Science Foundation Graduate Research Fellow and a student member of the IEEE. B. Don Russell:received B.S. and M.E. degrees in electrical engineering at Texas A&M University. He holds a Ph.D. from the University of Oklahoma in power system engineering. Dr. Russell is a professor of electrical engineering and director of the Power System Automation Laboratory of the Electric Power Institute Texas A&M University. His research centers on the use of advanced technologies to solve problems in power system control protection and monitoring. He is the recipient of several awards and patents for advanced digital technology applications. Dr. Russell is a member of the IEEE Power Engineering Society Executive Board. He also chairs the annual TAMU Conference for Protective Relay Engineers and the Fault and Disturbance Analysis Conference. Dr. Russell is a fellow of the IEEE a Registered Professional Engineer and a member of the Texas Society of Professional Engineers.

Researchers at Texas A&M Universitv have studied the effects of battle damage on ship power distribution cables, with particular interest in damaged cables which did not fail immediately. The electrical signatures of partiallv damaged cables are significant and are detectable with advanced protection methods used on terrestrial power svstems. Findings show that the damaged cable signatures are similar to those of arcing faults on terrestrial power distribution svstems, which can be reliably detected using an on-line expert svstem [1,2,3]. The implications of these findings are significant. since the abilitv of a damaged ship to right through an encounter is entirelv dependent on keeping operational its various systems which rely on electric power, the ability to automatically detect and re-route power around damaged regions is imperative. by identifving the characteristics of failing power cables before catastrophic failure occurs, the protection process can be integrated into the ship automatic control system. The overall result is a more survivable ship.

关键词：

来源：评论

学校读者我要写书评

暂无评论

COMbAT system engineering FOR THE DDG-51 CLAss AND FUTURE sURFACE COMbATANTs

引用

NAVAL ENGINEERs JOURNAL 1993年第6期105卷 43-52页

作者： HOLDEN, RA The Author:is a combat system engineer in the Systems Engineering Branch Aegis Ship Combat Systems Division at the Naval Surface Warfare Center Dahlgren Division (NSWCDD) Dahlgren Va. He earned a B.S. degree in physics and mathematics from Arkansas Polytechnic College in 1965 and attended graduate school at Southern Illinois University and the University of Illinois earning an M.S. degree in physics in 1967. He was an electro- optics engineer for Delco Electronics before joining NSWCDD in 1972. He is a member of ASNE.

Constraints imposed on future surface combatant acquisition will demand both design-to-capability and design-to-cost. The future Navy must be affordable and, to go in harm's way, must be combat capable. The quality of future ships depends on establishing an acquisition process that ensures capability independent of the rate of ship construction or the missions of the fleet. This paper explores surface combatant acquisition strategy and the engineering process that supports it. Events that shaped the combat system portion of the DDG-51 shipbuilding program are reviewed as a b.s.s to propose a modification to the process of future acquisitions. A historical perspective is established by outlining the shipbuilding program as it evolved from about 1978 to 1989. Factors that shaped the eventual upgrade program are presented in terms of the acquisition strategy and system engineering, which led to definition of the combat system configurations. Conclusions b.s.d on the information presented suggest that a more efficient system engineering process is needed to execute future preplanned upgrades and to support long-term plans. This process is described in terms of a single research and development funding line for configuration definition, design, and development. This approach differs from the traditional ship design, acquisition, and construction process in terms of continuity of system development and emphasis on interdependencies of the combat system and ship.

关键词：

来源：评论

学校读者我要写书评

暂无评论

sTATIsTICAL PROCEss-CONTROL FOR sOFTWARE IN THE MAINTENANCE PHAsE

引用

NAVAL ENGINEERs JOURNAL 1993年第3期105卷 192-200页

作者： LUKE, sR JACObs, DA REED, bM Stephen R. Luke:is a registered professional engineer in the Commonwealth of Virginia. He received his B.S. in mechanical engineering from Virginia Polytechnic Institute in 1983 and is presently pursuing a master's degree in engineering management at Old Dominion University. Mr. Luke is experienced as a test engineer at the Norfolk Naval Shipyard (1978–1989) and as a reliability/quality engineer at the Naval Undersea Warfare Center Detachment Norfolk (1989-Present). Currently he is the group leader of the RMA/QA group for the AN/SQQ-89(V) Antisubmarine Warfare System at Naval Undersea Warfare Center Detachment Norfolk. Mr. Luke is a member of ASNE IEEE (Reliability Society) and ASQC and is an ASQC certified quality engineer and reliability engineer. Derya Alasya Jacobs:is an assistant professor in the Engineering Management Department at Old Dominion University (ODU). She has a B.S. in computer science and an M.S. and Ph.D in engineering management from the University of Missouri-Rolla. Prior to joining ODU Dr. Jacobs worked as a research engineer at the Center for Technology Transfer and Economic Development at the University of Missouri-Rolla. During the same period she served as a consultant in software development for Missouri Enterprise Rolla Missouri. Dr. Jacobs' research interests are in the areas of applied artificial intelligence decision support systems operations research and computer integrated manufacturing. Billie M. Reed:is an assistant professor in the Engineering Management Department at Old Dominion University. He received a B.S. degree in mechanical engineering from Auburn University in 1971. After completing undergraduate studies Dr. Reed was commissioned as an officer in the U.S. Navy where he served in the nuclear submarine force until 1982. Following his military career Dr. Reed worked for nine years as a systems engineer and human-machine interface designer of complex interactive computer based systems for use in aircraft space and ship systems. He received his M.S. and Ph

As technology advances and our dependency on software increases, the requirement to develop the correct means to improve quality in both the deveiopment phase and the maintenance phase of software life cycle support becomes increasingly significant. The focus of this paper is on the dilemma facing software engineering in maintaining quality within the constraints of the maintenance phase. The paper further proposes that the software maintenance process can also be analvzed and improved using statistical process control (sPC) techniques. The methods discussed in this paper have been proposed for use in the software Maintenance project at NUWC Detachment Norfolk. Upon successful testing at NUWC Detachment Norfolk, they will be forwarded to the AN/sQQ-89(V) (interagencv) software Quality Evaluation Committee for use by other agencies which are developing and maintaining AN/sQQ-89(V) software.

关键词：

来源：评论

学校读者我要写书评

暂无评论

QUALITY MANAGEMENT AND MAsTER ORDNANCE REPAIR

引用

NAVAL ENGINEERs JOURNAL 1993年第5期105卷 68-76页

作者： sTIMsON, WA MARTINEZ, E William A. Stimson:received his B.S. degree in mathematics from the University of Texas at El Paso in 1964 and his M.S. degree in engineering from the University of Santa Clara in 1971. Mr. Stimson was employed in the aerospace industry for ten years then joined the Naval Ship Weapon Systems Engineering Station in Port Hueneme Calif in 1973. At NSWSES he served ten years as a ship qualification trials project supervisor and seven years as program manager of the Master Ordnance Repair Program. Today Mr. Stimson lives in Charlottesville Va. and is a Ph.D candidate in systems engineering at the University of Virginia majoring in quality management and statistical quality control. Ernest Martinez:received his B.S. degree in computer sciences from National University in 1985. Mr. Martinez was head of combat systems at the Naval Ship Repair Facility Yokosuka Japan for five years returning in 1983 to the Naval Sea Support Center Pacific San Diego Calif. During the next five years he managed the Fleet Modernization Program and was coordinator of the Combat System Readiness Test Program. Today Mr. Martinez lives in San Diego and is employed by the Naval Surface Warfare Center Port Hueneme Calif. as MOR program manager.

because of the redefinition of national defense needs and the reduction of defense budgets, the management of complex combatant repair is more imperative than ever. To this end, the U.s. Navy is calling for Total Quality Leadership (TQL) strategies from its agencies and contractors. These strategies are derived from well known initiatives of quality management, such as those of Deming. They define the b.s.s of any quality program. Quality methodologies have proven highly effective in the manufacturing sector, but many remain unproven or tentative in service and repair industries. The authors believe that TQL methods can be effective in the repair industry also, but must be developed or adapted to suit the unique characteristics of that industry: high skill, non-rote crafts, with continual customer interface at all levels of operation. In establishing a direction for TQL development, the authors have chosen two elements. The first is the Malcolm baldrige Quality Improvement Program, which provides guidelines for direction. The second is the Master Ordnance Repair (MOR) Program, which provides the management vehicle. From its beginning in 1983, MOR has been a program of management. The task is explicit in its charter, NAVsEAINsT 8000.2, which requires that a MOR contractor manage combat system work and testing. Quality management methods are applied to the MOR program to achieve MOR objectives using baldrige measurements. Methods are presented which deploy the quality function across the organization. Techniques are provided to improve the company's ability to control its processes and the rob.s.ness of its product. These include methods of process analysis that determine added value, ownership, and internal customer. stress is placed on in-process verification rather than on end-of-process inspection. The recommendations of this paper require no extraordinary skills or costs, but do require a formal and systematic approach to quality issues. The authors believe that

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：