检索结果-内蒙古大学图书馆

Architectural models for realization of web-based personal health systems 09

Architectural models for realization of web-based personal h...

International Conference on computer systems and Technologies and Workshop for PhD Students in Computing, CompSysTech'09

作者： Shopov, Mitko Spasov, Grisha Petrova, Galidia Department of Electronics Technical University of Sofia Branch Plovdiv Bulgaria Department of Computer Systems and Technologies Technical University of Sofia Branch Plovdiv Bulgaria Faculty of Electronics and Automatics Department of Electronics Technical University of Sofia Bulgaria

ISBN: (纸本)9781605589862

Recent advances in Information and Communication Technologies (ICT) and more specifically in wireless networks and mobile computing have driven new directions in the development of e-Health sector. New emerging concepts like mobile health (m-Health) and Personal Health systems (PHS) are expected to revolutionize the way healthcare services are delivered. In the paper a description on the specifics of the PHS's building blocks is presented. An example multi-tiered architectural model for realization of PHS is included and a description of characteristics and functions of the tiers is suggested. © 2009 ACM.

关键词： Portals

来源：评论

学校读者我要写书评

暂无评论

Modeling a spatial communication activity in wireless sensors network

Modeling a spatial communication activity in wireless sensor...

引用

8th International Workshop on Modeling and Applied Simulation, MAS 2009, Held at the International Mediterranean and Latin American Modeling Multiconference, I3M 2009

作者： Nikodem, Jan Klempous, Ryszard Nikodem, Maciej Woda, Marek Chaczko, Zenon Institute of Technical Cybernetics Wroclaw University of Technology Poland Institute of Computer Engineering Automatics and Robotics Wroclaw University of Technology Poland Institute of Computer Science Control and Robotics Faculty of Electronics Wroclaw University of Technology Poland University of Technology Sydney NSW Australia

ISBN: (纸本)9781629934747

This paper presents a novel method of modeling spatial communication activity in wireless sensor network (WSN). We define native aspects of communication in WSN. Focusing on local/global activity dilemma, cooperation, interference, network topology, and optimization aspects. A neighborhood abstraction is defined and we involve three binary relations: subordination, tolerance and collision to describe the cooperation in WSN. Using digital terrain model tools we model communication activity aspects as surfaces, stretched over WSN network. A network topology features are modeled using bare drainage surface. It is a component of a topographic map, which gives a direction towards the base station, determined by a slope of the modeled surface. Modeling node's instant energy level, we construct another surface represents node's instant level of consumed energy. Finally, we construct a drainage surface spread over each node neighborhood as superposition of bare drainage surface, energy consumed and relational surfaces.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

Modelling Dynamics in Processes and systems 1

引用

丛书名： Studies in Computational Intelligence

2009年

作者： Wojciech Mitkowski Janusz Kacprzyk

ISBN: (数字)9783540922032

ISBN: (纸本)9783540922025;9783642100758

Dynamics is what characterizes virtually all phenomenae we face in the real world, and processes that proceed in practically all kinds of inanimate and animate systems, notably social systems. For our purposes dynamics is viewed as time evolution of some characteristic features of the phenomenae or processes under consideration. It is obvious that in virtually all non-trivial problems dynamics can not be neglected, and should be taken into account in the analyses to, first, get insight into the problem consider, and second, to be able to obtain meaningful results. A convenient tool to deal with dynamics and its related evolution over time is to use the concept of a dynamic system which, for the purposes of this volume can be characterized by the input (control), state and output spaces, and a state transition equation. Then, starting from an initial state, we can find a sequence of consecutive states (outputs) under consecutive inputs (controls). That is, we obtain a trajectory. The state transition equation may be given in various forms, exemplified by differential and difference equations, linear or nonlinear, deterministic or stochastic, or even fuzzy (imprecisely specified), fully or partially known, etc. These features can give rise to various problems the analysts may encounter like numerical difficulties, instability, strange forms of behavior (e.g. chaotic), etc. This volume is concerned with some modern tools and techniques which can be useful for the modeling of dynamics. We focus our attention on two important areas which play a key role nowadays, namely automation and robotics, and biological systems. We also add some new applications which can greatly benefit from the availability of effective and efficient tools for modeling dynamics, exemplified by some applications in security systems.

关键词： Computational Mathematics and Numerical Analysis Mathematical Modeling and Industrial Mathematics Mathematics of Computing Mathematical and Computational Engineering Artificial Intelligence control, Robotics, Mechatronics

来源：评论

学校读者我要写书评

暂无评论

EMG signal classification using neural network with AR model coefficients

EMG signal classification using neural network with AR model...

引用

作者： Tomaszewski, J. Amaral, T.G. Dias, O.P. Wolczowski, A. Kurzyński, M. Institute of Informatics Automatics and Robotics Faculty of Electronics Technical University of Wroclaw Wroclaw Poland Escola Superior de Tecnologia de Setúbal/IPS CESET ISR - Pólo Coimbra 2910-761 Setúbal Portugal Escola Superior de Tecnologia de Setúbal/IPS CESET INESC - Lisboa 2910-761 Setúbal Portugal Department of Systems and Computer Networks Portugal

ISBN: (纸本)9783902661555

In this work authors proposes two approaches for discriminating between five predefined grasps using the EMG signals. In the first approach, the signal energy and the number of zero-crossing are used as signal features. In the second, the signal is modeled using the AR model and its coefficients became the features. Feature vectors created from both approaches are processed by a neural network with a linear transfer function, which classifies them as one of above mentioned grasps. From the experimental results, pattern identification using the AR model obtained good efficiency for the studied grasps.

关键词： Biomedical signal processing

来源：评论

学校读者我要写书评

暂无评论

Discrete event control and fault detection and localization of a robotic system

Discrete event control and fault detection and localization ...

引用

International Conference on computer Engineering and systems

作者： Hamdi A. Awad Mostafa M. Gomaa Ahmed R. Anwar Department of Industrial Electronics and Control Engineering Faculty of Electronic Engineering Minufiya University Minuf Egypt Department of Computer and Systems Engineering Faculty of Engineering Ain Shams University Cairo Egypt

ISBN: (纸本)9781424458424

A robotic system at the discrete event level requires a suitable discrete event controller that guarantees coordination and dead lock avoidance. It requires also a robust system of fault detection and localization based on minimum feedback information. This paper proposes a new approach fulfilling the discrete event coordinated control and also achieving the fault detection and localization (FDL) tasks. This approach is based on Petri net model of the robotic system, on Petri net supervisor employing place invariant technique, and based on a Petri net diagnoser on employing g-marking concept. The robotic system under investigation is composed of two autonomous robots to be moved in five rooms according to certain crossing control rules. The application of the proposed approach results in coordinated robots motion and detection and localization of a simulated fault.

关键词： control systems Fault detection Robot kinematics Petri nets Discrete event systems Artificial intelligence Service robots Industrial electronics Supervisory control Fault diagnosis

来源：评论

学校读者我要写书评

暂无评论

Droop based control of parallel-connected single-phase inverters in D-Q rotating frame

Droop based control of parallel-connected single-phase inver...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： Saeed Golestan Mahmood Joorabian Hasan Rastegar Arman Roshan Josep M. Guerrero Faculty of Electrical Engineering Amirkabir University of Technology슠 Tehran Iran Shahid Chamran University Ahvaz Iran Center of Power Electronics Systems Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Automatic Control Systems Computer Engineering Universitat Poliltècnica de Catalunya Barcelona Spain

ISBN: (纸本)9781424435067

In this paper, control of parallel single-phase inverters in direct-quadrature(DQ) rotating frame based on droop method is proposed. For each inverter, a secondary orthogonal imaginary circuit is created to provide the second phase required for the transformation; thus a DQ model of the inverter is obtained. The DQ transformation provides a time-invariant model of the inverter which makes the control design similar to that of dc-dc converters. The recognition of this analogy is important in that all of advanced dc-dc converters control techniques that have been previously developed can be applied to the control parallel inverters. The controller then is designed in DQ frame. Theoretically, infinite loop gain can be achieved in DQ rotating frame resulting in the elimination of the steady state error at the fundamental frequency of the inverter. The output impedance of the inverters is also considered, to ensure the decoupling between active and reactive power control using droop method. Simulation results are provided to prove the concept.

关键词： Inverters Communication system control Circuits DC-DC power converters Uninterruptible power systems Power system reliability control systems control design Frequency Reactive power control

来源：评论

学校读者我要写书评

暂无评论

EMG signal classification using neural network with AR model coefficients

引用

IFAC Proceedings Volumes 2009年第13期42卷 318-325页

作者： J. Tomaszewski T.G. Amaral O.P. Dias A. Wołczowski M. Kurzyński Institute of Informatics Automatics and Robotics Faculty of Electronics Technical University of Wroclaw Wroclaw Poland Escola Superior de Tecnologia de Setúbal/IPS CESET ISR – Pólo Coimbra 2910-761 Setúbal Portugal (Tel: +351-265-79000) Escola Superior de Tecnologia de Setúbal/IPS CESET INESC – Lisboa 2910-761 Setúbal Portugal (Tel: +351-265-79000) Chair of Systems and Computer Networks

Abstract In this work authors proposes two approaches for discriminating between five predefined grasps using the EMG signals. In the first approach, the signal energy and the number of zero-crossing are used as signal features. In the second, the signal is modeled using the AR model and its coefficients became the features. Feature vectors created from both approaches are processed by a neural network with a linear transfer function, which classifies them as one of above mentioned grasps. From the experimental results, pattern identification using the AR model obtained good efficiency for the studied grasps.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Design and implementation of supervisory control schemes in industrial automation systems

Design and implementation of supervisory control schemes in ...

引用

International Conference on computer Engineering and systems

作者： Mostafa M. Gomaa Hamdi A. Awad Ahmed R. Anwar Department of Computer and Systems Engineering Faculty of Engineering Ain Shams University Cairo Egypt Department of industrial Electronics and Control Engineering Faculty of Electronic Engineering Minufiya University Minuf Egypt

Industrial automation systems have a hybrid nature. Such systems contain continuous activities and discrete event activities, interacting with each other. This paper proposes a control algorithm dealing with the continuous activities, as well as the discrete ones. The discrete event controller performs resource allocation and coordination tasks at the higher level of the hybrid system. The direct implementation of the proposed algorithm to the industrial environment is discussed. Also, a hybrid industrial process, batch one, is handled as an application example to test the proposed algorithm.

关键词： Supervisory control Electrical equipment industry Industrial control Design automation Design engineering Automatic control computer industry electronics industry Industrial electronics control systems

来源：评论

学校读者我要写书评

暂无评论

Calculation of core loss using the Jiles-Atherton model incorporated into magnetic field analysis

引用

Archives of Electrical Engineering 2007年第219-1期56卷 57-69页

作者： Jagiela, Mariusz Institute of Electromechanical Systems and Industrial Electronics Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

The paper deals with the calculation of hysteresis power loss in cores of electromechanical converters. The analysis was carried out using the Jiles-Atherton model of ferromagnetic hysteresis incorporated into two-dimensional time-stepping finite element model. A vector hysteresis model was constructed by the vectorisation of a scalar model. The total power loss due to hysteresis was split into two component, one originating from the purely alternating magnetic field, and the second being a consequence of the local predomination of vector nature of magnetic field distribution. Two computational examples are presented showing the general applicability of the algorithm for determination of power loss distribution.

关键词： Electric losses

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

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：