检索结果-内蒙古大学图书馆

2009 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Bin Xu Andrew Kurdila Daniel J. Stilwell Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Mechanical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

For an autonomous vehicle navigating in a static environment for which an a priori map is inaccurate, we propose a hybrid receding horizon control method to determine optimal routes when new obstacles are detected. The hybrid method uses the level sets of the solution to either a global or local Eikonal equation in the formulation of the receding horizon control problem. Whenever an obstacle is detected along the path of the autonomous vehicle, a solution to a local Eikonal equation is used to determine whether a new, global Eikonal equation must be solved for use in the receding horizon optimization problem. The decision to select a new level set solution is made based on certain matching conditions that guarantee the optimality of the path. The selection of a global or local solution to the Eikonal equation induces a hybrid system structure in the control formulation. We rigorously prove sufficient conditions that guarantees that the vehicle will converge to the goal as long as the goal is accessible. In the end, simulation results are discussed.

关键词： Path planning Equations Remotely operated vehicles Mobile robots Vehicle detection Level set Navigation Optimal control Control systems Sufficient conditions

来源：评论

学校读者我要写书评

暂无评论

Hall effect current transducer characterization under nonsinusoidal conditions

Hall effect current transducer characterization under nonsin...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： Antonio Cataliotti Dario Di Cara Salvatore Nuccio Alexander E. Emanuel Department of Electrical Electronic and Telecommunication Engineering Università di Palermo Viale delle Scienze Palermo Italy Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA USA

ISBN: (纸本)9781424433520

The performance of Hall effect current transducers (HECT), under distorted waveform conditions, are usually characterized by means of the frequency response test. In this paper it was investigated if the frequency response is able to correctly evaluate the ratio and the phase errors under distorted conditions. A set of experimental measurements were carried out by comparing the frequency response with test conditions closer to real operation conditions. Two HECTs were characterized under two conditions: 1. sinusoidal excitation with frequencies from 30 to 800 Hz; 2. nonsinusoidal excitation using fundamental frequency and one harmonic, with adjusted phase shift. It was found that ratio and phase errors are weakly affected by the phase angle between the harmonic and the fundamental. Moreover, the effect of conductor location in the HECT window was also investigated. Harmonic phase and ratio errors depend on the position of the primary conductor in the window. These results suggest that the frequency response approach for the evaluation of HECT performance, under distorted waveform conditions, can be used for a error compensation method only if the position of the primary conductor is known.

关键词： Hall effect Transducers Frequency response Conductors Testing Error correction Phase distortion Distortion measurement Frequency measurement Error compensation

来源：评论

学校读者我要写书评

暂无评论

A new Differential Evolution with wavelet theory based mutation operation

A new Differential Evolution with wavelet theory based mutat...

引用

Congress on Evolutionary Computation

作者： J.C.Y. Lai F.H.F. Leung S.H. Ling Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China Department of Electrical and Computer Engineering National University of Singapore Singapore

An improved differential evolution (DE) that incorporates a wavelet-based mutation operation to control the scaling factor is proposed. The wavelet theory applied is to enhance DE in exploring the solution spaces more effectively for better solutions. A suite of benchmark test functions is employed to evaluate the performance of the proposed method. It is shown empirically that the proposed method outperforms significantly the existing methods in terms of convergence speed, solution quality and solution stability.

关键词： Genetic mutations Evolution (biology) Signal processing algorithms Benchmark testing Stability Evolutionary computation Biomedical signal processing Space exploration Stochastic processes Probability distribution

来源：评论

学校读者我要写书评

暂无评论

Selfish Misbehavior Detection in CSMA Cooperative Networks with HARQ

Selfish Misbehavior Detection in CSMA Cooperative Networks w...

引用

IEEE International Conference on Wireless and Mobile Computing, Networking And Communications (WiMob)

作者： Sintayehu Dehnie Stefano Tomasin Electrical and Computer Engineering Department Polytechnic Institute of New York University Brooklyn NY USA Department of Information Engineering University of Padova Padova Italy

In wireless cooperative transmissions, nodes may deviate from the cooperative protocol to reduce energy consumption while still reaping the benefits of other nodes' cooperation. Misbehavior is implemented by refraining from responding to cooperation request, mimicking adverse channel conditions. From time to time (with a given percentage) cooperations requests are accepted in order to avoid being detected as selfish. In this paper, we propose a technique for detecting misbehavior of nodes in an ad hoc network using carrier sense multiple access (CSMA) and automatic repeat request (ARQ) protocol. Each node can detect control packets of ARQ among source, destination and cooperating nodes, and collect statistics on their decoding probability. Selfish behavior is detected based on uniformly most powerful (UMP) test which yields the minimum miss detection probability for a given false alarm probability.

关键词： Multiaccess communication Automatic repeat request Probability Wireless application protocol Energy consumption Ad hoc networks Access protocols Automatic control Statistics Decoding

来源：评论

学校读者我要写书评

暂无评论

Superconducting Magnetic Energy Storage Systems for Power System Applications

Superconducting Magnetic Energy Storage Systems for Power Sy...

引用

2009 International Conference on Applied Superconductivity and Electromagnetic Devices(应用超导与电磁装置技术国际会议 ASEME 2009)

作者： D. Sutanto K.W.E. Cheng IEEE School of Electrical Computer and Telecommunications Engineering University of Wollongong Woll Department of Electrical Engineering Hong Kong Polytechnic University Hung Hom Hong Kong China

Advancement in both superconducting technologies and power electronics led to High Temperature Superconducting Magnetic Energy Storage Systems (SMES) having some excellent performances for use in power systems, such as rapid response (millisecond), high power (multi-MW), high efficiency, and fourquadrant control. This paper provides a review on SMES applications to power systems.

关键词： smes power system energy storage superconductor

来源：评论

学校读者我要写书评

暂无评论

Technology Roadmap for High Frequency Integrated DC-DC Converter

Technology Roadmap for High Frequency Integrated DC-DC Conve...

引用

2009 IEEE 6th International Power Electronics and Motion Control Conference-ECCE Asia

作者： Michele Lim Arthur Ball Fred C. Lee K. D. T. Ngo Center for Power Electronics Systems The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg

This preliminary roadmap is provided for state-of-the-art technologies and trends toward integration of point-of-load converters. This paper encompasses an extended survey of literature ranging from device technologies and magnetic materials to integration technologies and approaches. The paper is organized into three main sections. 1) Device technologies, including the trench MOSFET, lateral MOSFET and lateral trench MOSFET, are discussed along with their intended applications. The critical role of device packaging to high-frequency integration is assessed. 2) Magnetic materials: In recent years, a number of new magnetic materials have been explored in various research labs to facilitate magnetic integration for high-frequency POL applications. These data are collected and organized to help selecting magnetic material for various current levels and frequency ranges. 3) Levels of integration, which are defined with the focus on magnetic integration techniques and approaches, namely board-level, package-level and wafer-level, each with suitable current scale and frequency range.

关键词： MOSFET Technology Roadmap for High Frequency Integrated DC-DC Converter

来源：评论

学校读者我要写书评

暂无评论

Signal Processing Applications in Network Intrusion Detection Systems

引用

EURASIP Journal on Advances in Signal Processing 2009年第1期2009卷 1-2页

作者： Huang, Chin-Tser Chang, Rocky K.C. Huang, Polly Department of Computer Science and Engineering University of South Carolina Columbia USA Department of Computing The Hong Kong Polytechnic University Kowloon China Department of Electrical Engineering National Taiwan University Taipei Taiwan

来源：评论

学校读者我要写书评

暂无评论

Patterning of SU-8 resist with Digital Micromirror Device (DMD) maskless lithography

Patterning of SU-8 resist with Digital Micromirror Device (D...

引用

Optical Microlithography XXII

作者： Wang, Tao Quaglio, Marzia Pirri, Fabrizio Cheng, Yang-Chun Busacker, David Cerrina, Franco Center for Nanotechnology University of Wisconsin-Madison Madison WI 53706 United States Materials Science Program University of Wisconsin-Madison Madison WI 53706 United States Polytechnic of Torino Physics Department Materials and Microsystems Laboratory C. so Duca degli Abruzzi 24 I-10129 Torino Italy Department of Electrical and Computer Engineering University of Wisconsin-Madison Madison WI 53706 United States Department of Electrical and Computer Engineering Boston University Boston MA 02215 United States

ISBN: (纸本)9780819475275

Digital micromirror device (DMD) based maskless lithography has a number of advantages including process flexibility, no physical photomask requirement, fast turnaround time, cost effectiveness. It can be particularly useful in the development stage of microfluidic and bioMEMS applications. In this report, we describe the initial results of thick resist SU-8 patterning, soft lithography with polydimethylsiloxane (PDMS) and lift-off of Cr features using a modified DMD maskless system. Exposures of various patterns and microfluidic channels reveal that the system is well capable of printing 60 μm thick resist at a resolution as small as a single pixel (less than 13 μm) with an aspect ratio about 5:1. Both negatively and positively tapered sidewalls are achieved by projecting the UV light from front side of the SU-8 coated Si wafer and from the back side of the coated glass, respectively. The positive sidewall has an angle 88 which is ideal to serve as a mold for subsequent PDMS soft lithography. Both SU-8 and PDMS microfluidic devices for biomolecular synthesis were fabricated with this maskless system. In addition, a lift-off process was also developed with the intention to create built-in metal features such as electrodes and heaters. © 2009 SPIE.

关键词： Microfluidics

来源：评论

学校读者我要写书评

暂无评论

A system approach for temperature dependency of impedance-based structural health monitoring

A system approach for temperature dependency of impedance-ba...

引用

Smart Sensor Phenomena, Technology, Networks, and Systems 2009

作者： Zhou, Dao Kim, Jeong Ki Ha, Dong Sam Quesenberry, Joshua D. Inman, Daniel J. Department of Electrical and Computer Engineering Virginia Tech Blacksburg VA 24061 United States Center for Intelligent Material Systems and Structures Virginia Polytechnic Institute and State University 310 Durham Hall Mail Code 0261 Blacksburg VA 24061 United States

ISBN: (纸本)9780819475534

An impedance-based structural health monitoring (SHM) system employs a piezoelectric patch to excite the structure under test and capture its response. Impedance-based SHM offers several advantages over other methods such as good performance for local damage detection and simple hardware. A major problem for impedance-based SHM is temperature dependency. Specifically, baseline impedance profiles of structures vary as the ambient temperature changes. In this paper, we propose a new method to compensate the effect of temperature on baseline profiles. Our method is to select a small subset of baseline profiles for some critical temperatures and estimates the baseline profile for a given ambient temperature through interpolation. We incorporated our method into our SHM system and investigated the effectiveness of our method. Our experimental results show that (i) our method reduces the number of baseline profiles to be stored, and (ii) estimates the baseline profile of a give temperature accurately. © 2009 SPIE.

关键词： Structural health monitoring

来源：评论

学校读者我要写书评

暂无评论

EmCodeSyn: A visual framework for multi-rate data flow specifications and code synthesis for embedded applications

EmCodeSyn: A visual framework for multi-rate data flow speci...

引用

Forum on Specification, Verification and Design Languages, FDL

作者： Bijoy A. Jose Jason Pribble Lemaire Stewart Sandeep K. Shukla FERMAT Laboratory Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

In this paper, a new framework EmCodeSyn is introduced for visual debugging, execution and code synthesis from multi-rate data flow based specifications. EmCodeSyn is an attempt to create a formal semantics based visual framework for specifying safety critical applications such as automotive control, avionics fly-by-wire control, etc. In contrast with SIMULINK/Stateflow, LabVIEW and other visual tools, EmCodeSyn is based on a synchronous programming paradigm akin to the polychronous language SIGNAL. The formalism on which this work is based, is called MRICDF (multi-rate instantaneous channel connected data flow). The specification formalism has relational semantics, which enables static rate-analysis for scheduling the computation in the code generation stage. Hierarchical data flow specification with minimal amount of control specification makes it easier for designers to compose existing MRICDF models to create larger ones. Once the feasibilty of an MRICDF design is verified, code synthesis is performed by the tool to generate C code. EmCodeSyn design methodology provides a visual framework for generating verifiable deterministic code from synchronous specification based on MRICDF formalism.

关键词： Clocks Equations Application software Debugging Synchronous generators Software safety Flow graphs Network synthesis Design methodology Software tools

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：