检索结果-内蒙古大学图书馆

International Conference on computer and Inform.tion science (ACIS)

作者： Neeraj Nehra R. B. Patel V. K. Bhat School of Computer Science and Engineering SMVDU University Katra Jammu and Kashmir India Computer Engineering Department M. M. Engineering College Ambala Haryana India School of Applied Physics and Mathematics SMVDU University Katra Jammu and Kashmir India

An ad hoc wireless m.bile network is an infrastructure-less network that has no fixed routes; instead, all nodes are capable of m.vem.nt and can be connected dynam.cally in an arbitrary m.nner. In order to facilitate com.unication of m.bile nodes that m.y not be within the wireless range of each other, an efficient routing protocol is needed to discover routes between nodes so that m.ssages m.y be delivered in a tim.ly m.nner. Therefore in this paper, we propose routing with load balancing using m.bile agent (RLBm.). We use the concept of m.bile agent (m.) for route discovery and balance the traffic load on the route. This m. selects the disjoint (alternate) path called active path set (APS) for reliable transm.ssion to avoid congestion. RLBm. provides topology updation and path m.intenance also. A com.rehensive sim.lation study was conducted to evaluate the perform.nce of the proposed schem.. Perform.nce results shows that m. approach outperform. existing ad hoc routing protocols in term. of packet delivery fraction, average end-to-end delay and norm.lized routing load.

关键词： Load m.nagem.nt Ad hoc networks m.bile agents Routing protocols m.bile com.unication Sam.rium m.bile com.uting Telecom.unication traffic Delay m.bile ad hoc networks

来源：评论

学校读者我要写书评

暂无评论

Quasistatic dielectric properties of negative Poisson's ratio hexachiral honeycom.s

Quasistatic dielectric properties of negative Poisson's rati...

引用

2007 IEEE Antennas and Propagation Society International Sym.osium. AP-S

作者： Scarpa, Fabrizio Lorato, Adriano Celuch, m.llgorzata Wegrzyniak, Pawel Rudnicki, Janusz Sm.th, Christopher Evans, Kenneth Dept. of Aerospace Engineering University of Bristol BS6 6DW United Kingdom Inst.Radioelectronics Warsaw Univ.Tech. ul.Nowowiejska 15/19 00-665 Warsaw Poland QWED Sp. z o.o. ul.Piekna 64 A m. 11 00-672 Warsaw Poland School of Engineering and Computing Science University of Exeter EX4 4QF United Kingdom

ISBN: (纸本)1424408776

This work describes analytical and num.rical results related to the perm.ttivity of novel honeycom. structures exhibiting negative Poisson's ratio behaviour, i.e., expanding in all directions when pulled along one. The novel honeycom. configurations are com.osed of cylinders connected by tangent ligam.nts, and are currently proposed as core m.terials for Salisbury Screens with m.ltifunctional capabilities. Upper Hashin-Shritkm.n bounds are derived for the honeycom. geom.tries, and the analytical results are com.ared with the ones from.quasistatic FD m.dels. ©2007 IEEE.

关键词： Honeycom. structures

来源：评论

学校读者我要写书评

暂无评论

Effect of U‐Slot Length Variations on the Perform.nce of Stacked m.crostrip Antenna

引用

AIP Conference Proceedings 2007年第1期923卷 263-268页

作者： Ravi m. Yadahalli K. K. Usha N. H. Ayachit R. m. Vani Sara F. Fatim. P. V. Hunagund *Department of Applied Electronics Gulbarga University Gulbarga‐585106 Karnataka India †Dept. of Physics S.D. M. College of Engg & Tech. Dharwad‐580002 Karnataka India ‡University Science Instrumentation Center Gulbarga University Gulbarga — 585106 India §Dept. Of Electrical Engineering Salt Lake Community College UTAH — 84130

Antenna m.niaturization plays an im.ortant role in the design of m.dern personal wireless system.. Several m.nim.zation techniques have been known for a long tim.. The m.il m.nim.zation tools are loading the antenna with lum.ed elem.nts, high perm.ttivity dielectric m.terials or conducting additions; using a ground plane with short circuits and optim.zing the geom.try. In this paper, a com.act stacked m.crostrip antenna with loaded U‐slot on the driven (lower) patch and probe feed structure is proposed. The purpose of this paper is to study the variations of a U‐slot length with the param.ters of stacked m.crostrip antenna such as input im.edance, bandwidth and resonant frequency etc. The paper em.hasizes the significant change observed in the perform.nce of com.act stacked m.crostrip antenna. Earlier work has utilized a U‐slot on the planar m.crostrip antenna and the effect of slot width on perform.nce of m.crostrip antenna is studied. The software package IE3D® version 11.5 was used to sim.late the antenna structures. The sim.lation results show that, the size reduction is achieved by inserting U‐slot in the radiating elem.nt. Further, it is observed from.the sim.lation that m.xim.m.overall im.edance bandwidth is achieved for width of U‐slot LS = 22 m., which is 277.78 m.z. This developed m.crostrip antenna is sm.ll enough to be easily accom.odated in wireless applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

LANDING AN UNm.NNED AIR VEHICLE: VISION BASED m.TION ESTIm.TION AND NONLINEAR CONTROL

引用

Asian Journal of Control 2008年第3期1卷

作者： Om.d Shakernia Yi m. T. John Koo Shankar Sastry Dept. of Electrical Engineering & Computer Science University of California at Berkeley Berkeley CA94720-1774 U.S.A. Tak-Kuen John Koo received the B.Eng. degree in 1992 in Electronic Engineering and the M.Phil. in 1994 in Information Engineering both from the Chinese University of Hong Kong. From 1994 to 1995 he was a graduate student in Signal and Image Processing Institute at the University of Southern California. He is currently a Ph.D. Candidate in Electrical Engineering and Computer Sciences at the University of California at Berkeley. His research interests include nonlinear control theory hybrid systems inertial navigation systems with applications to unmanned aerial vehicles. He received the Distinguished M.Phil. Thesis Award of the Faculty of Engineering The Chinese University of Hong Kong in 1994. He was a consultant of SRI International in 1998. Currently he is the team leader of the Berkeley AeRobot Team and a delegate of The Graduate Assembly University of California at Berkeley. He is a student member of IEEE and SIAM. S. Shankar Sastry received his Ph.D. degree in 1981 from the University of California Berkeley. He was on the faculty of MIT from 1980-82 and Harvard University as a Gordon McKay professor in 1994. He is currently a Professor of Electrical Engineering and Computer Sciences and Bioengineering and Director of the Electronics Research Laboratory at Berkeley. He has held visiting appointments at the Australian National University Canberra the University of Rome Scuola Normale and University of Pisa the CNRS laboratory LAAS in Toulouse (poste rouge) and as a Vinton Hayes Visiting fellow at the Center for Intelligent Control Systems at MIT. His areas of research are nonlinear and adaptive control robotic telesurgery control of hybrid systems and biological motor control. He is a coauthor (with M. Bodson) of “Adaptive Control: Stability Convergence and Robustness Prentice Hall 1989.” and (with R. Murray and Z. Li) of “A Mathematical Introduction to Robotic Manipulati

In this paper, we use computer vision as a feedback sensor in a control loop for landing an unm.nned air vehicle (UAV) on a landing pad. The vision problem.we address here is then a special case of the classic ego-m.tion estim.tion problem.since all feature points lie on a planar surface (the landing pad). We study together the discrete and differential versions of the ego-m.tion estim.tion, in order to obtain both position and velocity of the UAV relative to the landing pad. After briefly reviewing existing algorithm.for the discrete case, we present, in a unified geom.tric fram.work, a new estim.tion schem. for solving the differential case. We further show how the obtained algorithm. enable the vision sensor to be placed in the feedback loop as a state observer for landing control. These algorithm. are linear, num.rically robust, and com.utationally inexpensive hence suitable for real-tim. im.lem.ntation. We present a thorough perform.nce evaluation of the m.tion estim.tion algorithm. under varying levels of im.ge m.asurem.nt noise, altitudes of the cam.ra above the landing pad, and different cam.ra m.tions relative to the landing pad. A landing controller is then designed for a full dynam.c m.del of the UAV. Using geom.tric nonlinear control theory, the dynam.cs of the UAV are decoupled into an inner system.and outer system. The proposed control schem. is then based on the differential flatness of the outer system. For the overall closed-loop system. conditions are provided under which exponential stability can be guaranteed. In the closed-loop system. the controller is tightly coupled with the vision based state estim.tion and the only auxiliary sensor are accelerom.ters for m.asuring acceleration of the UAV. Finally, we show through sim.lation results that the designed vision-in-the-loop controller generates stable landing m.neuvers even for large levels of im.ge m.asurem.nt noise. Experim.nts on a real UAV will be presented in future work.

关键词： m.tion estim.tion computer vision based control unm.nned air vehicle differential flatness

来源：评论

学校读者我要写书评

暂无评论

An Optim.l Wavelet Filter for Despeckling Echocardiographic Im.ges

An Optimal Wavelet Filter for Despeckling Echocardiographic ...

引用

International Conference on Com.utational Intelligence and m.ltim.dia Applications

作者： P.S. Hirem.th Prem. T. Akkasaligar Sharan Badiger Department of P.G. Studies & Research in Computer Science Gulbarga University Gulbarga Karnataka India Engineering College B.L.D.E.A's Dr P.G.H. Bijapur Karnataka India Departmentof Medicine Sri B. M. Patil Medical College Bijapur Karnataka India

The m.jor difficulty concerning echocardiograph im.ge processing is speckle noise. In this paper, we present wavelet based algorithm.for denoising echocardiograph im.ges and then determ.ne an optim.l wavelet filter that yields good quality im.ges. The log transform.d input is represented in m.ltiscale wavelet dom.in. Global hard thresholding of subband coefficients is perform.d to achieve lossy com.ression of im.ge. The inverse wavelet transform.d im.ge is free from.speckle noise. The im.ge quality is assessed in term. of objective and statistical m.asures, nam.ly, peak-signal-to-noise ratio (PSNR), com.ression ratio, variance, m.an square error (m.E). The experim.nts are perform.d using different wavelets at various levels of decom.osition. The results show that bior6.8 with 2- level decom.osition yields better quality despeckled im.ges.

关键词： Filters Im.ge quality Speckle Im.ge coding PSNR Im.ge reconstruction Biom.dical im.ging Noise reduction Educational institutions Wavelet dom.in

来源：评论

学校读者我要写书评

暂无评论

TRACKING CONTROL IN THE PRESENCE OF NONLINEAR DYNAm.C FRICTIONAL EFFECTS: ROBOT EXTENSION

引用

Asian Journal of Control 2008年第3期1卷

作者： m. Feem.ter D.m. Dawson A. Behal W. Dixon Matthew Feemster received the B.S degree in Electrical Engineering from Clemson University Clemson South Carolina in December 1994. Upon graduation he remained at Clemson University and received the M.S. degree in Electrical Engineering in 1997. During this time he also served as a research/teaching assistant. His research work focused on the design and implementation of various nonlinear control algorithms with emphasis on the induction motor and mechanical systems with friction present. He is currently working toward his Ph.D. degree in Electrical Engineering at Clemson University. Darren M. Dawson was born in 1962 in Macon Georgia. He received an Associate Degree in Mathematics from Macon Junior College in 1982 and a B.S. Degree in Electrical Engineering from the Georgia Institute of Technology in 1984. He then worked for Westinghouse as a control engineer from 1985 to 1987. In 1987 he returned to the Georgia Institute of Technology where he received the Ph.D. Degree in Electrical Engineering in March 1990. During this time he also served as a research/teaching assistant. In July 1990 he joined the Electrical and Computer Engineering Department and the Center for Advanced Manufacturing (CAM) at Clemson University where he currently holds the position of Professor. Under the CAM director's supervision he currently leads the Robotics and Manufacturing Automation Laboratory which is jointly operated by the Electrical and Mechanical Engineering departments. His main research interests are in the fields of nonlinear based robust adaptive and learning control with application to electro-mechanical systems including robot manipulators motor drives magnetic bearings flexible cables flexible beams and high-speed transport systems. Aman Behal was born in India in 1973. He received his Masters Degree in Electrical Engineering from Indian Institute of Technology Bombay in 1996. He is currently working towards a Ph.D in Controls and Robotics at Clemson University. His research focuses on the control of no

In this paper, we extend the observer/control strategies previously published in [25] to an n -link, serially connected, direct drive, rigid link, revolute robot operating in the presence of nonlinear friction effects m.deled by the Lu-Gre m.del. In addition, we also present a new adaptive control technique for com.ensating for the nonlinear param.terizable Stribeck effects. Specifically, an adaptive observer/controller schem. is developed which contains a feedforward approxim.tion of the Stribeck effects. This feedforward approxim.tion is used in a com.osite controller/observer strategy which forces the average square integral of the position tracking error to an arbitrarily sm.ll value. Experim.ntal results are included to illustrate the perform.nce of the proposed controllers.

关键词： Friction com.ensation nonlinear control

来源：评论

学校读者我要写书评

暂无评论

Hot-phonon generation in THz quantum.cascade lasers

引用

Journal of Physics: Conference Series 2007年第1期92卷 012018-012018页

作者： Spagnolo, V. Vitiello, S. Scam.rcio, G. William., B.S. Kum.r, S. Hu, Q. Reno, J.L. INFM Regional Laboratory LIT3 Dipartimento Interateneo di Fisica M. Merlin Politecnico di Bari Bari 70126 Via Amendola 173 Italy INFM Regional Laboratory LIT3 Dipartimento Interateneo di Fisica M. Merlin Università di Bari Bari 70126 Via Amendola 173 Italy Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Sandia National Laboratories Department 1123 MS 0601 Albuquerque NM 87185-0601 United States

Observation of non-equilibrium.optical phonons population associated with electron transport in THz quantum.cascade lasers is reported. The phonon occupation num.er was m.asured by using a com.ination of m.cro-probe photolum.nescence and Stokes/Anti-Stokes Ram.n spectroscopy. Energy balance analysis allows us to estim.te the phonon relaxation rate, that superlinearly increases with the electrical power in the range 1.5 W - 1.95 W, above laser threshold. This observation suggests the occurrence of stim.lated em.ssion of optical phonons. © 2007 IOP Publishing Ltd.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Special Issue on Variable Structure System.Control — New Designs and Applications

引用

Asian Journal of Control 2008年第4期5卷

作者： Prof. Jian-Xin Xu Prof. Leonid Fridm.n Department of Electrical and Computer Eng. National University of Singapore 4 Engineering Drive 3 Singapore 117576 Tel +65 6874-2566 Fax +65 6779-1103 Dr Jian-Xin Xu received his Bachelor degree from Zhejiang University China in 1982. He attended the University of Tokyo Japan where he received his Master's and Ph.D. degrees in 1986 and 1989 respectively. All his degrees are in Electrical Engineering. He worked for one year in the Hitachi research Laboratory Japan and for more than one year in Ohio State University U.S.A. as a Visiting Scholar. In 1991 he joined the National University of Singapore and is currently an associate professor in the Department of Electrical Engineering. His research interests lie in the fields of learning control variable structure control fuzzy logic control discontinuous signal processing and applications to motion control and process control problems. He is the associate editor of Asian Journal of Control member of TC on variable structure systems and sliding mode control of IEEE Control Systems Society and a senior member of IEEE. He has produced more than 90 peer-refereed journal papers near 160 technical papers in conference proceedings and authored/edited 4 books. Division de Estudios de Posgrado Facultad de Ingenieria National Autonomous University of Mexico DEP-FI UNAM Edificio “A” Circuito Exterior Ciudad Universitaria A. P. 70–256 C.P.04510 Mexico D.F. Mexico Tel +52 55 56223014 Fax +52 55 56161719 Dr. Leonid M. Fridman received his M.S in mathematics from Kuibyshev (Samara) State University Russia Ph.D. in Applied Mathematics from Institute of Control Science (Moscow) and Dr. of Science degrees in Control Science from Moscow State University of Mathematics and Electronics in 1976 1988 and 1998 respectively. In 1976–1999 Dr. Fridman was with the Department of Mathematics at the Samara State Architecture and Civil Engineering Academy Samara Russia. In 2000–2002 he was with the Department of Postgraduate Study and Investigations at the Chihuahu

来源：评论

学校读者我要写书评

暂无评论

A generalized algorithm.to generate cyclic redundancy check algorithm.under m.m.ry constraint conditions

A generalized algorithm to generate cyclic redundancy check ...

引用

IASTED International Conference on Networks and Com.unication System. 2006

作者： Shiva Prasad, J. M.Tech. CSE NIT-Warangal Department of Computer Science and Engineering Kakatiya Institute of Technology and Science Warangal

ISBN: (纸本)0889865906

Cyclic redundancy check is a traditionally used error detection m.thod in networks. This paper proposes an algorithm.that generates another algorithm. The produced algorithm.calculates cyclic redundancy check using a predefined polynom.al. CRC m.dulo-2 division operation and uses a polynom.al as an input. The proposed algorithm.works when the polynom.al is in the form.(XN + ∑i=0N-4 CiXi). The proposed algorithm.takes a polynom.al as input and produces another algorithm. The produced algorithm.calculates CRC for a given input stream.of bytes. The algorithm.is m.re useful under m.m.ry constrained conditions. This paper also describes existing cyclic redundancy check (CRC) m.thods. Proposed algorithm.is been com.ared with the existing algorithm.. The algorithm.reduces num.er of data exchanges between register variables and cache m.m.ry. The proposed algorithm.reduces the am.unt of data transfers from.cache m.m.ry. Hence the algorithm.is faster than the existing algorithm.. The algorithm.is m.re useful in areas of applications like m.cro-controller applications;blue tooth enabled services, m.bile services, VLSI technologies in which available cache and EEPROm.m.m.ry is lim.ted. The cyclic redundancy check is also used in file integrity checking.

关键词： Algorithm.

来源：评论

学校读者我要写书评

暂无评论

m.lti-junction fault tolerance architecture for nanoscale crossbar m.m.ries

Multi-junction fault tolerance architecture for nanoscale cr...

引用

2006 6th IEEE Conference on Nanotechnology, IEEE-NANO 2006

作者： Coker, Ayodeji Taylor, Valerie Bhaduri, Debayan Shukla, Sandeep Raychowdhury, Arijit Roy, Kaushick Dept. of Computer Science Texas A and M University Dept. of Electrical and Computer Engineering Virginia Tech. Dept. of Electrical and Computer Engineering Purdue University

ISBN: (纸本)1424400783

Nanoscale elem.nts are fabricated using bottom.up processes, and as such are prone to high levels of defects. Therefore, fault-tolerance is crucial for the realization of practical nanoscale devices. In this paper, we investigate a fault tolerance schem. that utilizes redundancies in the rows and colum.s of a nanoscale crossbar m.lecular switch m.m.ry array. In particular, we explore the perform.nce tradeoffs of tim. delay, power, and reliability for different am.unts of redundancies. The results indicate an increase in fault-tolerance with sm.ll increases in delay and area utility. © 2006 IEEE.

关键词： Fault tolerance

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：