检索结果-内蒙古大学图书馆

TECHNICAL ISSUES REGARDING SATELLITE PACKET-SWITCHING

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

来源：评论

学校读者我要写书评

暂无评论

PERFORMANCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A MULTISERVICE MULTIBEAM SATELLITE

引用

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 baseband 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 BASEBAND 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

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

VALUE-AND-CRITERION FILTERS - A NEW FILTER STRUCTURE-BASED UPON MORPHOLOGICAL OPENING AND CLOSING 4

VALUE-AND-CRITERION FILTERS - A NEW FILTER STRUCTURE-BASED U...

引用

4TH CONF ON NONLINEAR IMAGE PROCESSING

作者： SCHULZE, MA PEARCE, JA Department of Electrical and Computer Engineering Biomedical Engineering Program University of Texas at Austin Austin 78712 TX United States

ISBN: (纸本)0819411353

In this paper, we introduce the value-and-criterion filter structure and give an example of a filter with the structure. The value-and-criterion filter structure is based on morphological opening (or closing), which is actually two filters applied sequentially: the first assigns values based on the original image values, and the second assigns values based on the results of the first. The value-and-criterion structure is similar, but includes an additional step in parallel to the first that computes a different set of values to use as criteria for selecting a final value. Value-and-criterion filters have a "value" function (ν) and a "criterion" function (C), each operating separately on the original image, and a "selection" operator (S) acting on the output of C The selection operator chooses a location from the output of C, and the output of ν at that point is the output of the overall filter. The value-and-criterion structure allows the use of different linear and nonlinear elements in a single filter, but also provides the shape control of morphological filters. An example of a value-and-criterion filter is the Mean of Least Variance (MLV) filter, which we define to have ν = mean, C = variance, and S = minimum. The MLV filter resembles several earlier edge-preserving smoothing filters, but performs better and is more flexible and more efficient. The MLV filter smooths homogeneous regions and enhances edges, and is therefore useful in segmentation algorithms. We illustrate its response to various image features and compare it to the median filter on different biomedical images. © 1993 SPIE. All rights reserved.

关键词： Median filters

来源：评论

学校读者我要写书评

暂无评论

A real-time multi-processor 3-D echocardiographic reconstruction system

A real-time multi-processor 3-D echocardiographic reconstruc...

引用

Proceedings of the 30th Annual Rocky Mountain Bioengineering Symposium and the 30th International ISA Biomedical Sciences Instrumentation Symposium

作者： Desai, R. Buckey, J.C. Pearce, J.A. Dept Electrical/Computer Engineering Biomedical Engineering Program University of Texas Austin TX United States

ISBN: (纸本)1556174578

Real-time imaging systems involve high speed processing for a variety of algorithms. An important timing constraint in the design of a real-time reconstruction system is that each individual step must be performed at video-rate. We seek to develop a real-time system for 3-D reconstruction of cardiac structures from successive 2-D B-scan ultrasound images acquired using the Tilt Echo technique, developed by Buckey et al. This system will be used to evaluate cardiac performance parameters such as stroke volume and ventricular mass.

关键词： Echocardiography

来源：评论

学校读者我要写书评

暂无评论

Advances in dielectric measurements using an open-ended coaxial line sensor

Advances in dielectric measurements using an open-ended coax...

引用

1993 Canadian Conference on electrical and computer engineering, CCECE 1993

作者： Anderson, J.M. Sibbald, C.L. Stuchly, S.S. Caputa, K. Dept. of Electrical and Computer Engineering University of Victoria VictoriaBC Canada RADARSAT Program Office - Technology Canadian Space Agency OttawaON Canada

ISBN: (纸本)0780314433

A recently proposed rational function model for the aperture admittance of 50 ohm teflon filled coaxial lines in contact with a homogeneous dielectric is experimentally validated. A calibration technique of the automatic network analyzer utilizing standard terminations and time domain gating is used. Uncertainties in the dielectric properties of reference liquids do not enter the calibration procedure. Experimental results for water are compared with estimated values. A model expression for the sensitivity of the probe is validated. The sensitivities of several coaxial line probes for the measurements made are determined. © 1993 IEEE.

关键词： Calibration

来源：评论

学校读者我要写书评

暂无评论

MODELING MULTISCALE SPATIAL ECOLOGICAL PROCESSES UNDER THE DISCRETE-EVENT SYSTEMS PARADIGM

引用

LANDSCAPE ECOLOGY 1993年第4期8卷 273-286页

作者： DEVASCONCELOS, MJP ZEIGLER, BP GRAHAM, LA Centro Nacional de Informaçäo Geográfica Lisboa Portugal Advanced Resource Technology Program Biosciences East room 203 The University of Arizona Tucson USA Department of Electrical and Computer Engineering The University of Arizona Tucson USA School of Renewable Natural Resources Room 203 Biosciences East The University of Arizona Tucson USA

A multi-scale spatial ecological model of a wet sclerophyllous forest subject to recurrent fires is presented. The model is specified in a Discrete Event Systems framework (DEVS) (Zeigler, 1990) interfaced with a Geographic Information System (GIS), and includes the ability to simulate landscape dynamics at several levels of resolution simultaneously. This is achieved by encoding a modular hierarchical representation of the forest landscape components into a set of nested, interconnected, and spatially referenced dynamic models. The results of the landscape dynamics simulations are displayed as sequences of maps through time, illustrating the potential of this modeling methodology for dealing with complex hierarchical structures that operate at several spatial and temporal resolutions.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Functional architecture for a retinal prosthesis

Functional architecture for a retinal prosthesis

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： R.A. Jesinger V.L. Stonick Department of Electrical and Computer Engineering and the Biomedical Engineering Program Carnegie Mellon University Pittsburgh PA USA

来源：评论

学校读者我要写书评

暂无评论

AUTOMATED HIGHWAY SYSTEM EXPERIMENTS IN THE PATH program

引用

Journal of Intelligent Transportation Systems 1993年第1期1卷 63-87页

作者： Kwang Soo Chang J. Karl Hedrick Wei-Bin Zhang Pravin Varaiya Masayoshi Tomizuka Steven E. Shladover California Partners for Advanced Transit and Highways Program Institute of Transportation Studies Department of Mechanical Engineering Department of Electrical Engineering and Computer Sciences University of California Berkeley

The accomplishments to date on the experimental evaluation of Advanced Vehicle Control Systems (AVCS) technology for highway automation in the California PATH (Partners for Advanced Transit and Highways) program are summarized. The AVCS activities at PATH can be divided into two groups: longitudinal vehicle control and lateral vehicle control. The paper describes each of the activities with a concentration on experimental results achieved to date. The experimental setups and results are presented, followed by near-term plans for further work.

关键词： intelligent vehicle/highway systems advanced vehicle control systems vehicle lateral control vehicle longitudinal control vehicle sensing automated highway systems

来源：评论

学校读者我要写书评

暂无评论

Non-orthogonal Gabor representation of event-related potentials

Non-orthogonal Gabor representation of event-related potenti...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M.L. Brown W.J. Williams A.O. Hero Bioengineering Program and Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

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：