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A New UWB Skeletal Antenna for EMC Applications

A New UWB Skeletal Antenna for EMC Applications

IEEE 2007 International Symposium on Microwave,Antenna,Propagation and EMC Technologies for Wireless Communications(ISMAPE-2007)

作者： A.R.Mallahzadeh R.Pazoki S.Karimkashi Faculty of Engineering University of ShahedTehranIran University of Aradan GarmsarIran Graduate student School of Electrical and Computer EngineeringFaculty of EngineeringUniversity of TehranTehranIran

In this paper a new UWB antenna structure is introduced for EMC *** antenna is the skeletal form of the teardrop *** the frequency decreases,the usual teardrop antenna is not applicable since the weight of such antenna as well as its ground dimension considerably increases and such antenna has not a good resistance against the *** performance of the proposed antenna is compared with another member of wire UWB antennas' family which is called wire biconical *** results show that the proposed antenna,in comparison to the wire biconical one,has considerably better VSWR especially in the lower band of operation.

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Electrical Characteristics of GaAs Nanoneedles

Electrical Characteristics of GaAs Nanoneedles

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国际纳光电子学研讨会

作者： Christopher Chase Mike Huang Linus Chuang Michael Moewe Connie Chang-Hasnain Department of Electrical Engineering and Computer Sciences University of Califomia-Berkeley BerkeleyCA94720Graduate Student Department of Electrical Engineering and Computer Sciences University of Califomia-Berkeley BerkeleyCA94720 Department of Electrical Engineering and Computer Sciences University of Califomia-Berkeley BerkeleyCA94720 Department of Electrical Engineering and Computer Sciences University of Califomia-Berkeley BerkeleyCA94720 Department of Electrical Engineering and Computer Sciences University of Califomia-Berkeley BerkeleyCA94720

＜正＞Electrical contacts were formed to GaAs nanoneedles,and the electrical characteristics of the nanoneedles *** conditions for the devices were optimized in order to obtain Ohmic contacts to the nanoneedles.

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Epitaxial Ⅲ-Ⅴ Nanowires on Lattice-Mismatched Substrates by MOCVD

Epitaxial Ⅲ-Ⅴ Nanowires on Lattice-Mismatched Substrates b...

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国际纳光电子学研讨会

作者： Linus C. Chuang Michael Moewe Shanna Crankshaw Chris Chase Connie Chang-Hasnain Department of Electrical Engineering and Computer Sciences University of Califomia Berkeley California 94720 Graduate Student Department of Electrical Engineering and Computer Sciences University of Califomia Berkeley California 94720 Applied Science ＆ Technology Group University of California Berkeley California 94720 Department of Electrical Engineering and Computer Sciences University of California Berkeley California 94720 Department of Electrical Engineering and Computer Sciences University of California Berkeley California 94720

＜正＞We experimentally determined critical diameters（CDs）of epitaxial nanowires（NWs）grown on lattice- mismatched substrates by *** CD was found to be inversely dependent on lattice *** InP NWs on Si,quantization ...

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Effects of Ⅴ/Ⅲ Ratios on the Shape and Optical Properties of InP Nanowires Grown on Si Substrates

Effects of Ⅴ/Ⅲ Ratios on the Shape and Optical Properties ...

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国际纳光电子学研讨会

作者： Michael Moewe Linus C. Chuang Shanna Crankshaw Chris Chase Connie Chang-Hasnain Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley California 94720 Graduate Student Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley California 94720 Department of Electrical Engineering and Applied Science & Technology Group University of California at Berkeley Berkeley California 94720 Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley California 94720 Department of Electrical Engineering and Computer Sciences University of California at Berkeley Berkeley California 94720

We report the effect of varying the MOCVD gas precursor Ⅴ/Ⅲ ratios on the structural and optical properties of InP nanowires grown on(111)Si *** show record narrow photoluminescence linewidths for optimal ratios.

关键词： MOCVD Ratios on the Shape and Optical Properties of InP Nanowires Grown on Si Substrates InP Shape Effects of

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Offer-Based Real-Time Reactive Power Supply in a Restructured Power System

Offer-Based Real-Time Reactive Power Supply in a Restructure...

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IEEE General Meeting Power& Energy Society

作者： Moises R. L. Carvalho Joe H. Chow Robert W. de Mello Robert W. Waldele Student Member IEEE PhD student Federal University of Rio de Janeiro (UFRJ) Brazil. Fellow IEEE professor of Electrical Computer and Systems Engineering Associate Dean for Research Graduate Programs School of Engineering. Member IEEE Tau Beta Pi Eta Kappa Nu. Member IEEE Manager Electric System Planning NYISO.

This paper explores the inclusion of dynamic reactive power devices such as synchronous condensers, static VAr compensators (SVC), static synchronous compensators (STATCOM), and other flexible AC transmission system (FACTS) controllers, in a restructured setting. The operators of such devices may need to offer reactive power at a cost to be adequately compensated. It is assumed in this paper that the marginal cost to a generator of producing reactive power is negligibly small and generators would therefore offer reactive power at zero cost. A reactive power offer from these other devices would be accepted if it reduces the overall production cost. The rationale for introducing this offer-based reactive power supply is discussed. Three cases of a small power system are used to illustrate how system constraints and supplier constraints give rise to additional operating costs such as minimum generation costs and lost-opportunity costs. In each case an appropriate reactive power offer, from a reactive power supplier that would otherwise have no economic incentive to participate, can be used to remove a binding constraint and lower the overall production cost. The goal of this approach is to provide a stronger economic incentive for investments of needed reactive power supply in appropriate locations.

关键词： Real time systems Reactive power Power supplies Power systems Costs Power generation Power system dynamics Static VAr compensators Flexible AC transmission systems Production

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LANDING AN UNMANNED AIR VEHICLE: VISION BASED MOTION ESTIMATION AND NONLINEAR CONTROL

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Asian Journal of Control 2008年第3期1卷

作者： Omid Shakernia Yi Ma 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 unmanned air vehicle (UAV) on a landing pad. The vision problem we address here is then a special case of the classic ego-motion estimation problem since all feature points lie on a planar surface (the landing pad). We study together the discrete and differential versions of the ego-motion estimation, 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 geometric framework, a new estimation scheme for solving the differential case. We further show how the obtained algorithms enable the vision sensor to be placed in the feedback loop as a state observer for landing control. These algorithms are linear, numerically robust, and computationally inexpensive hence suitable for real-time implementation. We present a thorough performance evaluation of the motion estimation algorithms under varying levels of image measurement noise, altitudes of the camera above the landing pad, and different camera motions relative to the landing pad. A landing controller is then designed for a full dynamic model of the UAV. Using geometric nonlinear control theory, the dynamics of the UAV are decoupled into an inner system and outer system. The proposed control scheme 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 estimation and the only auxiliary sensor are accelerometers for measuring acceleration of the UAV. Finally, we show through simulation results that the designed vision-in-the-loop controller generates stable landing maneuvers even for large levels of image measurement noise. Experiments on a real UAV will be presented in future work.

关键词： Motion estimation computer vision based control unmanned air vehicle differential flatness

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Segmentation of apple fruit from video via background modeling

Segmentation of apple fruit from video via background modeli...

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2006 ASABE Annual International Meeting

作者： Tabb, Amy L. Peterson, Donald L. Park, Johnny Engineer and graduate student Appalachian Fruit Research Station/ARS/USDA Purdue University United States Agricultural Engineer Principal Research Scientist School of Electrical and Computer Engineering Purdue University United States

A method for locating apples was developed to process real-time video image sequences captured with an over-the-row harvester. The concepts of background modeling in RGB color were used, which is a novel approach to the apple segmentation problem. In background modeling, the distributions of background colors are approximated from real data. The algorithm developed for this task, Global Mixture of Gaussians (GMOG), is based on the principles of Mixture of Gaussians (MOG), which is used for motion-detection applications. The algorithm correctly identified -85-96% of both red and yellow apples and performed at -14-16 frames per second. This is the first work to our knowledge that uses video sequences to detect apple fruit. The potential advantages of using video include allowing harvesting on-the-go, detecting occluded fruit via camera movement to the occluded areas, using visual servoing of robotic grippers to grasp fruit, and achieving a faster harvest time.

关键词： Fruits

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Correlation Coefficient based Loss Differentiation Algorithm (CCLDA) for TCP vis-à-vis traditional LDAs

Correlation Coefficient based Loss Differentiation Algorithm...

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student Conference on Research and Development (SCOReD)

作者： Abhishek Murthy Student-Computer engineering department SIES Graduate School of Technology Mumbai University Mumbai India

This paper proposes an LDA to help us tune a wireless network thus enabling better network utilization and throughputs, which in turn result into increased customer satisfaction. Correlation between various TCP parameters is used. CC-LDA uses a statistical approach but ensures fewer loads on a client side processing applications. Various samples were collected from the IPDM server and were analyzed. I also propose a monitoring lifecycle using CC-LDA involving a knowledge base to gain some priori knowledge through tests. The paper ends with a comparison with other existing LDAs.

关键词： Linear discriminant analysis Wireless networks Throughput Propagation losses Bit error rate Research and development Customer satisfaction Network servers Monitoring Life testing

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Practical Approach of Induction Heating Device for Dismantlable Adhesion in Interior Construction

Practical Approach of Induction Heating Device for Dismantla...

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第二届亚洲机械电子学学术会议

作者： Hideo Tomita Takamitsu Sekine Shinzo Yoshimura Hiroshi Watanabe Department of Electronic and Computer Engineering Graduate course student Electro-mechanical Laboratory Tokyo Denki University Japam

The practical approaches of induction heating device for dismantlable adhesion in interior construction are presented. This method is applied an unique combination of thermoplastic adhesive and electromagnetic induction heating(IH).A thermoplastic adhesive,that is called“hot-melt adhesive”,applied to interior materials or steel stud in construction,is heated and melted by our developed portable IH *** this method can be easily and cleanly disassembled by applying IH *** construction method is named as “ALLOVER” method. Developed IH device is very light and compact for handling. Therefore workers evaluate the simple operating and distinguished efficiency in field *** introduce the ALLOVER method and other practical approaches,and prove the usefulness of the method.

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An Induction Heating Method with Traveling Magnetic Field for Long Structure Metal

An Induction Heating Method with Traveling Magnetic Field fo...

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第二届亚洲机械电子学学术会议

作者： Takamitsu Sekine Hideo Tomita Shuji Obata Yukio Saito Graduate course student Electro-mechanical Laboratory Japan Department of Electronic and Computer Engineering Japan Department of Natural Sciences Japan Department of Intelligent Mechanical Engineering Tokyo Denki University Japan

About few years ago,a novel dismantlable (dismantle-able)adhesion method for interior construction was *** method was applied a high frequency electromagnetic induction heating(IH)and a thermoplastic *** an adhesion of interior finishing material to long steel stud,a conventional spiral coil like an IH cooking heater is unsuitable for uniform heating to the ***,we propose newly IH method with traveling magnetic field for uniform heating to long structure *** this paper,we describe on the uniform heating method to long structure metal using 3-phase linear induction coil driven by 3-phase 20kHz *** the heating characteristics to thin steel plates and long studs,the proposed method is proved the usefulness for uniform heating to long structure metal.

关键词： An Induction Heating Method with Traveling Magnetic Field for Long Structure Metal

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