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阐述了印制板热分析得重要性,引出了热分析的概念,介绍了热分析的边界条件参数和热库模型,并对具体操作过程做了归纳和总结。 相似文献
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行为分析为网络管理员提供了一种新的技术手段,增强了网络管理的能力,其在网络管理领域的应用价值已经逐渐为人们所发现。论文对网络行为分析技术进行了介绍,分析了网络管理对行为分析的需求,并对行为分析应用于网络管理领域所能带来的优势和应用发展进行了介绍和分析,最后的结论认为,行为分析对网络管理能力的提高是显而易见的,值得对其进一步研究。 相似文献
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简要分析了国内外C4ISR系统功能需求分析的现状,提出了C4ISR系统功能需求的三层结构,简述了数据仓库的基本知识,构造了基于数据仓库的C4ISR系统功能需求分析体系结构及分析流程,并结合某装甲机械化部队C4ISR系统功能需求分析实例进行了应用分析,对保持分析过程中数据的一致性和部分分析细节进行了阐述,最后对文章所述方法的优缺点进行了总结. 相似文献
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针对10 kV配电站中的电气系统进行了详细的分析设计,首先简要分析了配电站开关站的布置方式,在此基础上对配电站电气系统进行了分析设计,给出了一次电气系统设计布置方案,并就其中一些关键性技术问题展开了探讨,最后分析了电气系统抗干扰措施的应用。 相似文献
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本文将下一代网络体系结构和软交换的特点结合起来分析,并且分析了相关的协议,并且分析了软交换技术协议中存在的不安全因素,进而提出了应对措施。 相似文献
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中国地区云量和云光学厚度的分布与变化趋势 总被引:1,自引:0,他引:1
利用最新的1983~2009年国际卫星云气候计划(ISCCP) D2月平均资料集,得到了中国地区总云量、低云量、中云量、高云量与云光学厚度的分布与变化趋势,结果表明:中国总云量和中云量呈现南多北少的分布,青藏高原地区高云量较大而低云量很小;总云量和中云量在东部呈增加趋势,西部呈减小趋势,低云量和高云量在大部分地区呈减小趋势。从不同季节来看,春季和秋季北方总云量增加,西部总云量减小;夏季大部分地区总云量增加,冬季大部分地区总云量减少。云的光学厚度呈现南多北少的分布,且在大部分地区呈增加趋势。同时利用中分辨率成像光谱仪(MODIS)资料分析了2001~2013年间中国不同污染地区总云量与云光学厚度的分布及变化趋势的异同,结果表明:中国不同污染地区云量与云光学厚度呈现不同的分布和变化规律。 相似文献
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Ai Bo Yang Zhi-Xing Pan Chang-Yong Zhang Tao-Tao Wang Yong Ge Jian-Hua 《Wireless Personal Communications》2006,38(4):495-507
In this paper, we focus on the Look-up Table (LUT) technique for the compensation of HPA nonlinear distortion. An improved LUT method is proposed with better performance compared with conventional LUT technique in terms of convergence speeds, BER and total degradation (TD). It can get over 8 dB gain in out-of-band spectrum re-growth suppression and about 0.3 dB BER performance gain than conventional LUT technique with the same iteration times. Also, we propose an actual application of HPA with pre-distorter in OFDM transmitter.
Ai Bo was born in Shannxi Province in China on February 7, 1974. He received a BSc. Degree from Engineering Institute of Armed Police Force in 1997, a Master and Dr. degree from Xidian University in 2002 and 2004 in China respectively, and now working as a post dr. in Dept. of E&E, state of key lab. on microwave and digital communications in Tsinghua University in China. He has once participated in the key research project on HDTV in TEEG (Team of Engineering Expert Group) of China. He is an editorial committee member of journal of “Computer Simulations”, “Information and Electronic Engineering”, an IEEE member and a senior member of Electronics Institute of China (CIE). He has published over 60 scientific papers in his research area till now. His current interests are the research and applications of OFDM techniques with emphasis on synchronization and HPA linearization techniques.
Yang Zhi-Xing graduated from Tsinghua University, P.R. China in 1970. He is now a Professor and Deputy Director of State Key Lab. on Microwave and Digital Communication at the Department of Electronic Engineering and the Director of the DTV R&D Center in Tsinghua University. As a DTV technical expert for the Chinese government, Professor Yang has also been a member of the DTV standardization Committee of China and a leader of the DTV Standardization Harmonizing Group in Ministry of Information Industry of China. His major research interests include broadband information transmission technologies and DTV broadcasting systems.
Pan Chang-Yong received the B.S. and M.S. degrees from the Department of Electronic Engineering in Tsinghua University, P.R. China, in 1996 and 1999, respectively. He is now an associate professor in the Department of Electronic Engineering and a member of the DTV R&D Center in Tsinghua University. His research interests are in the areas of broadband wireless transmission systems and satellite communications.
Zhang Tao-Tao was born in Shandong Province in China in 1982, he received BSc. degree from Tsinghua University in 2004 and now pursing his Master degree in Dept. of E&E, state of key lab. on microwave and digital communications in Tsinghua University in China. His research interests is the power amplifier linearization techniques.
Wang Yong was born in Shannxi Province in China in 1976. He received a BSc., a Master and a Dr. Degree from Xidian University in China in 1997, 2002 and 2005, respectively, and now is an associate professor in Xidian University. He has once participated in the key research project on HDTV in TEEG (Team of Engineering Expert Group) in China and is an IEEE Member. His interests are broadband multimedia communications.
Ge Jian-Hua was born in September, 1961 in JiangSu Province in China. He received the B.Sc., Master and Ph.D. degree from Xidian University in 1982, 1985 and 1989, respectively. He is now the professor in both Xidian University in Xi’an and Shanghai Jiaotong University in Shanghai. He is the senior member of Chinese Electronics Institute. He has won lots of scientific and technical prizes in China and published many papers. His interests are transmission communications and web security. 相似文献
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随着时代的发展,国家对人才的需求量不断增加,并且对人才培养的要求越来越高。高校作为人才输出的重要基地,人们对高等教育的重视程度不断加深,尤其是近年来高校在发展的过程中其规模也在不断的扩展,导致固定资产管理中的一些问题逐渐凸显出来。本文就固定资产管理中存在的问题进行分析,进一步探讨云计算技术在高校固定资产管理中的应用。 相似文献
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In this paper, we develop an analytical model to evaluate the delay performance of the burst-frame-based CSMA/CA protocol
under unsaturated conditions, which has not been fully addressed in the literature. Our delay analysis is unique in that we
consider the end-to-end packet delay, which is the duration from the epoch that a packet enters the queue at the MAC layer
of the transmitter side to the epoch that the packet is successfully received at the receiver side. The analytical results
give excellent agreement with the simulation results, which represents the accuracy of our analytical model. The results also
provide important guideline on how to set the parameters of the burst assembly policy. Based on these results, we further
develop an efficient adaptive burst assembly policy so as to optimize the throughput and delay performance of the burst-frame-based
CSMA/CA protocol.
Kejie Lu received the B.E. and M.E. degrees in Telecommunications Engineering from Beijing University of Posts and Telecommunications,
Beijing, China, in 1994 and 1997, respectively. He received the Ph.D. degree in Electrical Engineering from the University
of Texas at Dallas in 2003. In 2004 and 2005, he was a postdoctoral research associate in the Department of Electrical and
Computer Engineering, University of Florida. Currently, he is an assistant professor in the Department of Electrical and Computer
Engineering, University of Puerto Rico at Mayagüez. His research interests include architecture and protocols design for computer
and communication networks, performance analysis, network security, and wireless communications.
Jianfeng Wang received the B.E. and M.E. degrees in electrical engineering from Huazhong University of Science and Technology, China, in
1999 and 2002, respectively, and the Ph.D. degree in electrical engineering from University of Florida in 2006. From January
2006 to July 2006, he was a research intern in wireless standards and technology group, Intel Corporation. In October 2006,
he joined Philips Research North America as a senior member research staff in wireless communications and networking department.
He is engaged in research and standardization on wireless networks with emphasis on medium access control (MAC).
Dapeng Wu received B.E. in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 1990, M.E. in
Electrical Engineering from Beijing University of Posts and Telecommunications, Beijing, China, in 1997, and Ph.D. in Electrical
and Computer Engineering from Carnegie Mellon University, Pittsburgh, PA, in 2003.
Since August 2003, he has been with Electrical and Computer Engineering Department at University of Florida, Gainesville,
FL, as an Assistant Professor. His research interests are in the areas of networking, communications, multimedia, signal processing,
and information and network security. He received the IEEE Circuits and Systems for Video Technology (CSVT) Transactions Best
Paper Award for Year 2001, and the Best Paper Award in International Conference on Quality of Service in Heterogeneous Wired/Wireless
Networks (QShine) 2006.
Currently, he serves as the Editor-in-Chief of Journal of Advances in Multimedia, and an Associate Editor for IEEE Transactions
on Wireless Communications, IEEE Transactions on Circuits and Systems for Video Technology, IEEE Transactions on Vehicular
Technology, and International Journal of Ad Hoc and Ubiquitous Computing. He is also a guest-editor for IEEE Journal on Selected
Areas in Communications (JSAC), Special Issue on Cross-layer Optimized Wireless Multimedia Communications. He served as Program
Chair for IEEE/ACM First International Workshop on Broadband Wireless Services and Applications (BroadWISE 2004); and as a
technical program committee member of over 30 conferences. He is Vice Chair of Mobile and wireless multimedia Interest Group
(MobIG), Technical Committee on Multimedia Communications, IEEE Communications Society. He is a member of the Best Paper Award
Committee, Technical Committee on Multimedia Communications, IEEE Communications Society.
Yuguang Fang received a Ph.D. degree in Systems Engineering from Case Western Reserve University in January 1994 and a Ph.D. degree in
Electrical Engineering from Boston University in May 1997. He was an assistant professor in the Department of Electrical and
Computer Engineering at New Jersey Institute of Technology from July 1998 to May 2000. He then joined the Department of Electrical
and Computer Engineering at University of Florida in May 2000 as an assistant professor and got an early promotion to an associate
professor with tenure in August 2003 and to a full professor in August 2005. He has published over 200 papers in refereed
professional journals and conferences. He received the National Science Foundation Faculty Early Career Award in 2001 and
the Office of Naval Research Young Investigator Award in 2002. He has served on several editorial boards of technical journals
including IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEE Transactions on Mobile Computing
and ACM Wireless Networks. He have also been actively participating in professional conference organizations such as serving
as The Steering Committee Co-Chair for QShine, the Technical Program Vice-Chair for IEEE INFOCOM’2005, Technical Program Symposium
Co-Chair for IEEE Globecom’2004, and a member of Technical Program Committee for IEEE INFOCOM (1998, 2000, 2003–2007). He
is a senior member of the IEEE. 相似文献
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With the increasing importance of information and communication technologies in access to basic services like education and health, the question of digital divide based on caste assumes importance in India where large socioeconomic disparities persist between different caste groups. Studies on caste-based digital inequality are still scanty in India. Using nationally representative survey data, this paper analyzes the first-level digital divide (ownership of computer and access to the Internet) and the second-level digital divide (individuals skills to use computer and the Internet) between the disadvantaged caste groups and Others. Further, this paper identifies the caste-based differences in socioeconomic factors that contribute to the digital divide between these groups using a non-linear decomposition method. The results show that there exists large first-level and second-level digital divide between the disadvantaged caste groups and Others in India. The non-linear decomposition results indicate that caste-based digital divide in India is rooted in historical socioeconomic deprivation of disadvantaged caste groups. More than half of the caste-based digital gap is attributable to differences in educational attainment and income between the disadvantaged caste groups and Others. Findings of this study highlight the urgent need for addressing educational and income inequality between the different caste groups in India in order to bridge the digital divide. 相似文献
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欧洲科学商店及其启示 总被引:1,自引:0,他引:1
科学商店是荷兰在20世纪70年代创造的,现在已扩展到欧洲许多国家。科学商店不是传统意义上的商店,而是一种科学传播的理念和服务。它运用双向互动的科学传播创新机制,支持科研人员深入社区、拓宽研究范围;为社区居民提供科学和研究服务;为大学学生创造实践和了解社会的机会。参与科学商店研究项目的工作人员、科研人员、市民和其他专业人员都可以从中受益。我国的科普工作可以借鉴欧洲科学商店的运作机制和成功经验,在建立全社会支持科普工作的机制和网络、创新社区科学传播活动和提高公众的科学素质和参与度等方面进行思考和探索。 相似文献
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Three alternative schemes for secure Virtual Private Network (VPN) deployment over the Universal Mobile Telecommunication
System (UMTS) are proposed and analyzed. The proposed schemes enable a mobile node to voluntarily establish an IPsec-based
secure channel to a private network. The alternative schemes differ in the location where the IPsec functionality is placed
within the UMTS network architecture (mobile node, access network, and UMTS network border), depending on the employed security
model, and whether data in transit are ever in clear-text, or available to be tapped by outsiders. The provided levels of
privacy in the deployed VPN schemes, as well as the employed authentication models are examined. An analysis in terms of cost,
complexity, and performance overhead that each method imposes to the underlying network architecture, as well as to the mobile
devices is presented. The level of system reliability and scalability in granting security services is presented. The VPN
management, usability, and trusted relations, as well as their behavior when a mobile user moves are analyzed. The use of
special applications that require access to encapsulated data traffic is explored. Finally, an overall comparison of the proposed
schemes from the security and operation point of view summarizes their relative performance.
Christos Xenakis received his B.Sc. degree in computer science in 1993 and his M.Sc. degree in telecommunication and computer networks in
1996, both from the Department of Informatics and Telecommunications, University of Athens, Greece. In 2004 he received his
Ph.D. from the University of Athens (Department of Informatics and Telecommunications). From 1998–2000 was with the Greek
telecoms system development firm Teletel S.A., where was involved in the design and development of advanced telecommunications
subsystems for ISDN, ATM, GSM, and GPRS. Since 1996 he has been a member of the Communication Networks Laboratory of the University
of Athens. He has participated in numerous projects realized in the context of EU Programs (ACTS, ESPRIT, IST). His research
interests are in the field of mobile/wireless networks, security and distributed network management. He is the author of over
15 papers in the above areas.
Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Greece, in
1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and
1984, respectively. From 1983 to 1986, he was on the faculty of Electrical Engineering and Computer Science at the University
of Connecticut, Storrs. From 1986 to 1994 he was on the faculty of the Electrical and Computer Engineering Department at Northeastern
University, Boston, MA. During the period 1993–1994 he served as Director of the Communications and Digital Processing Research
Center at Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson
Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he
is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks
Laboratory (UoA-CNL) and the Networks Operations and Management Center. His research interests are in the design and performance
analysis of broadband networks, and wireless/mobile communication systems and services. He has authored more than 150 papers
in the above areas. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in
the framework of the Advanced Communication Technologies & Services (ACTS) and Information Society Technologies (IST) programmes
funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE). He is chairman of the board of
the Greek Universities Network, the Greek Schools Network, and member of the board of the Greek Research Network. In 1994,
he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications. 相似文献
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Chengming He Xin Dai Hanqing Xing Degang Chen 《Analog Integrated Circuits and Signal Processing》2006,49(3):281-289
In this paper, the systematic mismatch error in integrated circuits due to gradient effects is modeled and analyzed. Three
layout strategies with improved matching performance are reviewed and summarized. The hexagonal tessellation pattern can cancel
quadratic gradient errors with only 3 units for each device and has high area-efficiency when extended. Both the Nth-order circular symmetry patterns and Nth-order central symmetry patterns can cancel up to Nth-order gradient effects between two devices using 2N unit cells for each one. Among these three techniques, the central symmetry patterns have the best-reported matching performance
for Manhattan structures; the circular-symmetry patterns have the best theoretical matching performance; and the hexagonal
tessellation pattern has high density and high structural stability. The Nth-order central symmetry technique is compatible to all IC fabrication processes requiring no special design rules. Simulation
results of these proposed techniques show better matching characteristics than other existing layout techniques under nonlinear
gradient effects. Specifically, two pairs of P-poly resistors using 2nd and 3rd-order central symmetry patterns were fabricated
and tested. Less than 0.04% mismatch and less than 0.002% mismatch were achieved for the 2nd and the 3rd-order structures,
respectively.
Chengming He was born in YiWu, China in 1976. He received his B.S. in 1999 in Electronic Engineering department and his M.S. degree in
the institute of Microelectronics in 2001 at Tsinghua University, Beijing. He started to work toward his PhD in Iowa State
University since August 2001.
Since June 2004 he started to work as a design engineer in Silicon Laboratories, Inc., Austin, TX. He studied and designed
LNA, band-pass filter and on-chip power management blocks as well as matching-enhanced layout patterns. He is interested in
designing high gain low voltage amplifier, high speed power-efficient ADC and high speed high linear DAC as well as other
mixed-signal circuits. He is also interested in the application of nonlinear system dynamical theory in mixed-signal design
and yield-enhancement by improving layout matching. He has published more than 10 technical papers. He was a student member
of IEEE from 01--04 and now is a member. He is a member of Tau Beta Pi.
Xin Dai was born in Shanghai, China on March 11, 1981. She received the B.Eng. in 2003 from Shanghai Jiao Tong University, Shanghai,
China. She is currently a graduate student in Department of Electrical and Computer Engineering at Iowa State University,
Ames, IA. Her research has been connected to data converter design and calibrations, layout techniques and build-in-self-test.
Xin Dai is now taking a summer-intern in Broadcom Corp., CA.
Hanqing Xing was born in Dalian, China, in 1978. He received the B.S. and M.S. degrees with honors in Electronic Engineering from Tsinghua
University, Beijing, China, in 2000 and 2003, respectively. He is currently a PhD student at Iowa State University working
in analog and mixed signal design group. His research interests include analog, mixed-signal, and data-conversion integrated
circuits design and test.
Degang Chen received his B.S. degree in 1984 in Instrumentation and Automation from Tsinghua University, Beijing, China and his M.S.
and Ph.D. degrees in 1988 and 1992, respectively, both in Electrical and Computer Engineering, from the University of California,
Santa Barbara.
From 1984 to 1986, he was with the Beijing Institute of Control Engineering, a space industry R/D institute. From March 1992
to August 1992, he was the John R. Pierce Instructor of Electrical Engineering at California Institute of Technology. After
that, he joined Iowa State University where he is currently an Associate Professor. He was with the Boeing Company in summer
of 1999 and was with Dallas Semiconductor-Maxim in summer of 2001. His research experience include particulate contamination
in microelectronic processing systems, vacuum robotics in microelectronics, adaptive and nonlinear control of electromechanical
systems, and dynamics and control of atomic force microscopes. His current teaching and research interests are in the area
of analog and mixed-signal VLSI integrated circuit design and testing. In particular, he is interested in low-cost high-accuracy
testing and built-in-self-test of analog and mixed-signal and RF circuits, and in self-calibration and adaptive reconfiguration/repair
strategies for performance and yield enhancement.
Dr. Chen is the recipient of the Best Paper Award at the 1990 IEEE Conference on Decision and Control and the Best Transaction
Paper Award from the ASME Journal of Dynamic Systems, Measurement, and Control in 1995. He was selected an A.D. Welliver Faculty
Fellow with the Boeing Company in 1999. 相似文献