检索结果-内蒙古大学图书馆

European Conference on Microwave

作者： J. Choo J. Ryoo J. Hong H. Jeon C. Choi Manos M. Tentzeris RFID Research Laboratory LS Industrial Systems Anyang Gyeonggi South Korea Georgia Electronic Design Center School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

In this paper, we study T-matching networks that are commonly used for the efficient matching of UHF tags. In order to analyze relationship between T-matching geometry and antenna impedance, we interpret the transformer circuit as an equivalent circuit depending on the design parameters of the circuit. From the parametric study of the T-matching, we derive an optimized topology which is able to overcome electrically change of the geometry resulted from material loading. Next, based on the previous study, we design two types of tag antennas for practical item-level RFID applications that require the discrimination different objects. We calculate theoretically the minimum operating power of tags based on the computed antenna characteristics, antenna impedance, directivity, efficiency, regarding various dielectric constants. To verify the performance of the developed tags in practical conditions, we measure the minimum required power to activate tags on multiple objects in conjunction with commercial measurement system. As a result, the designed tags present almost consistent readability on materials from low to high dielectric constant. Thus, the results clearly verify that the appropriate T-matching geometry provides consistent readability in practical UHF RFID tags.

关键词： RFID tags Geometry Impedance Circuits Dielectric materials Antenna theory Antenna measurements Dielectric measurements Power measurement UHF measurements

来源：评论

学校读者我要写书评

暂无评论

An exterior-point approach to the fixed-order mixed H∞/D-stability controller design

An exterior-point approach to the fixed-order mixed H∞/D-st...

引用

International Conference on Control and Automation (ICCA)

作者： Takeshi Terada Yasushi Kami Eitaku Nobuyama Department of the Mechanical and Electronic System Engineering Akashi National College of Technology Hyogo Japan Department of the Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781424447060

This paper deals with the mixed H ∞ /D-stability control problem with a fixed-order output feedback controller. It is well known that this control problem is described as a combined bilinear matrix inequality (BMI) problem whose feasible solution is difficult to be found. In this paper, we propose a new exterior-point approach for finding a feasible solution of this problem. The advantage of our approach is to be able to use a non-stabilizing controller as an initial point. Numerical examples show the efficiency of our approach.

关键词： Output feedback Automatic control Linear matrix inequalities Iterative methods Educational institutions design automation Robust control Uncertainty Time factors computer numerical control

来源：评论

学校读者我要写书评

暂无评论

Advances in Medical Education on Surgical Techniques Using Satellite Communications

Advances in Medical Education on Surgical Techniques Using S...

引用

computer Modeling and Simulation, EMS, UKSIM European Symposium on FLAGGED

作者： Christos Papachristos Vasilis N. Tsoulkas Athanasios A. Pantelous Division of Information and Transmission Systems and Materials Technology Department of Electrical and Computer Engineering National and Technical University of Athens Greece Head of Engineering Design Division General Secretariat for Research and Technology Athens Greece Department of Mathematical Sciences University of Liverpool UK

In this article, we propose briefly the implementation of an integrated platform for the provision of advanced tele-medicine services over satellite, specifically tailored to the continuing medical education and training of health professionals on new surgical techniques. The system will enable the transmission of live high quality surgical video from operating rooms, including both panoramic and endoscopic view, in order to facilitate a) training of surgeons and/or students on advanced surgical techniques through the observation of live procedures using the da Vinci system and b) mentoring/proctoring of novice surgeons during their initial laparoscopic procedures. The system also provides interaction between trainees and local surgical tutors via videoconference. It is aimed at implementing an end-to-end solution, which will offer horizontal integration of the proposed tele-medicine service, with the offer of equipment and broadband satcom / telecom services, in a scalable and adaptable manner that can be easily replicated on a wider scale.

关键词： Satellite communication Minimally invasive surgery Oncological surgery Laparoscopes Robots Continuing education systems engineering education Materials science and technology Space technology Cancer

来源：评论

学校读者我要写书评

暂无评论

On-line model parameter estimations for time-delay systems

On-line model parameter estimations for time-delay systems

引用

Asian Control Conference

作者： Jung Hun Park Soohee Han Chan Gook Park Wook Hyun Kwon BK21 School for Creative Engineering Design of Next Generation Mechanical and Aerospace Systems Seoul National University Seoul Korea School of Mechanical and Aerospace Engineering Seoul National University Seoul Korea School of Electrical Engineering & Computer Science Seoul National University Seoul Korea

ISBN: (纸本)9781424454402

This paper concerns a problem of on-line model parameter estimations for multiple time-delay systems. In order to estimate unknown model parameters from measured state variables, we propose two schemes using the Lyapunov's direct method, called parallel and series-parallel model estimators, respectively. It is shown through a numerical example that the proposed parallel and series-parallel model estimators can be effective in estimating when sufficiently rich inputs are applied.

关键词： Parameter estimation State estimation Delay estimation Aerospace engineering Adaptive control Aerospace materials Transportation MIMO System identification Aging

来源：评论

学校读者我要写书评

暂无评论

A fixed-order D-stability controller design with an output feedback using a modified exterior-point approach

A fixed-order D-stability controller design with an output f...

引用

Asian Control Conference

作者： Takeshi Terada Yasushi Kami Eitaku Nobuyama Department of the Mechanical and Electronic System Engineering Advanced Courses of Akashi National College of Technology Hyogo Japan Department of the Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

ISBN: (纸本)9781424454402

This paper is concerned with a D-stability controller design problem with a static or a reduced-order output feedback controller. This problem is difficult to be solved theoretically, because it consists of some bilinear matrix inequality's (BMI's). In this paper, an exterior-point approach to this problem, which produces a controller sequence approaching a feasible region from an infeasible one is proposed. The feature of our approach is to be able to use a non-stabilizing controller as an initial point of the sequence. A numerical example shows the efficiency of our approach.

关键词： Output feedback Control systems Electric variables control Linear matrix inequalities Iterative methods Educational institutions Time factors Optimization methods State feedback systems engineering and theory

来源：评论

学校读者我要写书评

暂无评论

Cogeneration and potential for emission reductions in oil sands operations

Cogeneration and potential for emission reductions in oil sa...

引用

IEEE General Meeting Power& Energy Society

作者： Ganesh Doluweera Sarah Jordaan Joule Bergerson Michal. C. Moore Department of Electrical & Computer Engineering and the Energy and Environmental Systems Group University of Calgary Canada Faculty of Environmental Design and EESG University of Calgary Canada Department of Chemical & Petroleum Engineering & EESG University of Calgary Canada Department of Economics and EESG University of Calgary Canada

Oil sands operations are playing an increasingly important role in North American oil supplies. Extracting and processing bitumen from oil sands is an energy intensive process that requires both electricity and steam which are usually sourced through fossil fuel conversions. This energy intensity (and associated CO2 emissions) as well as the rapid expansion of extraction operations has led to concerns about the management of this resource. We investigate the competitiveness of two options to supply electricity and steam for oil sands operations in terms of cost and CO2 emissions. This paper presents preliminary results and highlights further areas of investigation.

关键词： Cogeneration Petroleum Natural gas Power generation Production Investments Costs Mesh generation Economic forecasting Government

来源：评论

学校读者我要写书评

暂无评论

Application of non-parametric statistics of the parametric response for defect diagnosis

Application of non-parametric statistics of the parametric r...

引用

IEEE International Test Conference

作者： R. Gudavalli W.R. Daasch P. Nigh D. Heaberlin Integrated Circuits Design and Test Laboratory Electrical and Computer Engineering Portland State University Portland OR USA Test Strategy and Development IBM Systems and Technology Group IBM Corporation Essex Junction VT USA

ISBN: (纸本)9781424448685

This paper presents a method using only the rank of the measurements to separate a part's elevated response to parametric tests from its non-elevated response. The effectiveness of the proposed method is verified on the 130nm ASIC. Good die responses are correlated for same parametric tests at different conditions such as temperature, voltage and or other stress. Nonparametric correlation methods are used to calculate the intra-die correlation. When intra-die correlation is found to be low the elevated vectors that lower correlation are extracted and input to IDDQ-based diagnostic tools. Monte-Carlo simulations are described to obtain confidence bounds of the correlation for good die test response.

关键词： Parametric statistics Circuit testing Temperature Integrated circuit testing System testing Fault diagnosis Inspection Scattering Displays Application software

来源：评论

学校读者我要写书评

暂无评论

Further Results on Lyapunov-Krasovskii Functionals via Nonlinear Small-Gain Conditions for Interconnected Retarded iISS systems

Further Results on Lyapunov-Krasovskii Functionals via Nonli...

引用

2009 American Control Conference (ACC 2009)

作者： Hiroshi Ito Pierdomenico Pepe Zhong-Ping Jiang Department of Systems Design and Informatics Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan Department of Electrical and Information Engineering University of L'Aquila 67040 Poggio di Roio L'Aquila Italy Department of Electrical and Computer Engineering Polytechnic Institute of New York University Six Metrotech Center Brooklyn NY 11201 USA

ISBN: (纸本)9781424445233

This paper presents further results on the problem of establishing stability of retarded nonlinear interconnected systems comprising integral input-to-state stable subsystems. It is shown that the stability of the interconnected systems with respect to external signals can be verified by constructing Lyapunov-Krasovskii functionals explicitly whenever small-gain type conditions are satisfied. The primary result [12] is generalized in two aspects. One is to introduce a new flexibility in constructing Lyapunov-Krasovskii functionals to deal with distributed delays more effectively. The other is to cover systems involving time-varying delays in interconnecting channels.

关键词： Interconnected systems Stability Control systems Indium tin oxide Delay systems Nonlinear systems Nonlinear control systems Delay effects Time varying systems Networked control systems

来源：评论

学校读者我要写书评

暂无评论

Direct memory access usage optimization in network applications for reduced memory latency and energy consumption

引用

Journal of Embedded Computing 2009年第3期3卷 241-254页

作者： Bartzas, Alexandros Peon-Quiros, Miguel Mamagkakis, Stylianos Catthoor, Francky Soudris, Dimitrios Mendias, Jose M. VLSI Design Center – Democritus Univ. Thrace 67100 Xanthi Greece DACYA/UCM Avda. Complutense s/n 28040 Madrid Spain IMEC vzw Kapeldreef 75 3001 Heverlee Belgium Professor at Katholieke Universiteit Leuven Belgium Microprocessors and Digital Systems Lab School of Electrical and Computer Engineering National Technical University of Athens 15780 Zografou Greece

Today, wireless networks are becoming increasingly ubiquitous. Usually several complex multi-threaded applications are mapped on a single embedded system and each of them is triggered by a different input stream (in accordance with the run-time behaviours of the user and the environment). This dynamicity renders the task of fully analyzing at design-time these systems very complex, if not impossible. Therefore, run-time information has to be used in order to produce an efficient design. This introduces new challenges, especially for embedded system designers using a Direct Memory Access (DMA) module, who have to know in advance the memory transfer behaviour of the whole system, in order to design and program their DMA efficiently. This is especially important in embedded systems with DRAM memories as the concurrent accesses from different processing elements can adversely affect the page-based architecture of these memory elements. Even more, the increasingly common usage of dynamic data types further complicates the problem because the exact location of data instances in the memory is unknown at design-time. In this paper we propose a system-level optimization methodology to adapt the DMA usage parameters automatically at run-time, according to online information. With our proposed optimization approach we manage to reduce the mean latency of the memory transfers by more than 18%, thus reducing the average number of cycles that processing elements or DMAs have to waste waiting for data from the main memory, while optimizing energy consumption and system responsiveness. We evaluate our approach using a set of real-life applications and real wireless dynamic streams.

关键词： DMA block transfer embedded systems multi-threading memory latency profiling

来源：评论

学校读者我要写书评

暂无评论

Model predictive control of fuel cell micro cogeneration systems

Model predictive control of fuel cell micro cogeneration sys...

引用

IEEE International Conference on Networking, Sensing and Control

作者： Michiel Houwing Rudy R. Negenborn Marija D. Ilic Bart De Schutter Electic Energy Systems Group of Carnegie Mellon University Pittsburgh PA USA Faculty of Technology Policy and Management Delft University of Technnology Delft Netherlands Delft Center of Systems and Control Delft University of Technnology Delft Netherlands Departments of Electrical and Computer Engineering and Engineering and Public Policy Carnegie Mellon University Pittsburgh PA USA Control of Future Electricity Network Operations Faculty of Technology Delft University of Technnology Delft Netherlands Marine and Transport Technology Department Delft University of Technnology Netherlands

With the increasing application of distributed energy resources and information technologies in the electricity infrastructure, innovative possibilities for incorporating the demand side more actively in power system operation are enabled. At the residential level energy costs could be reduced with intelligent price-based control concepts (demand response). A promising, controllable, residential distributed generation technology is micro cogeneration (micro-CHP). Micro-CHP is an energy efficient technology that simultaneously provides heat and electricity to households during operation. This paper presents a detailed model of a household using a proton exchange membrane fuel cell (PEMFC) micro-CHP system in conjunction with heat storage options to fulfil its heat and part of its electricity demand. Furthermore, a decentralised controller based on a model predictive control (MPC) strategy is proposed. MPC can take benefit of future knowledge on prizes and energy demands and can therefore lead to better system performance. In simulations the performance of the MPC-controlled PEMFC system is illustrated under different conditions regarding energy pricing, domestic energy demand, and system configuration.

关键词： Predictive models Predictive control Fuel cells Cogeneration Resistance heating Power system modeling Distributed control Energy resources Information technology Costs

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：