检索结果-内蒙古大学图书馆

作者： Kim, Dae-Kwan Han, Jae-Hung COMS Systems Department Communication Ocean and Meteorological Satellite Program Office Korea Aerospace Research Institute Daejeon 305-333 Korea Republic of Department of Aerospace Engineering KAIST 335 Gwahangno Yuseong-gu Daejeon 305-701 Korea Republic of

ISBN: (纸本)9781627481519

In the present study, a structural dynamic model of a flexible wing is suggested for the application to aeroelastic analyses of flapping-wing vehicles. To establish the structural dynamic model, the flexible multibody dynamics is used by considering not only the rigid root-flapping motion with a large stroke but also the local elastic deformation of a flexible flapping wing. The modeling method which has been derived for planar rotating problems is first verified with a rotating-beam problem, and then expanded to a flexible flapping wing with a three-dimensional flapping motion generated at an arbitrary flapping axis. Modal approach is also applied to the structural modeling in order to establish the reduced dynamic model for the efficient calculation of fluid-structure interaction analyses. The proposed model is verified with the structural dynamic test data of a rectangular flapping wing. Using the structural model, the fluid-structure interaction analyses of the rectangular flapping wing are also performed, and the results show good agreements between analysis and experimental data.

关键词： Dynamic models

来源：评论

学校读者我要写书评

暂无评论

Sequential flocking control system for multiple mobile robots

引用

Kongzhi Lilun Yu Yingyong/Control Theory and Applications 2008年第6期25卷 1117-1120+1127页

作者： Cheng, Lei Yu, Hui Wu, Huai-Yu Wang, Yong-Ji Engineering Research Center of Metallurgical Automation and Measurement Technology Wuhan University of Science and Technology Wuhan 430081 China Institute of Nonlinear and Complex Systems Three Gorges University Yichang 443002 China Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

Flocking control is a new type of control which coordinates the motions among multiple mobile robots. Current researches focus their attention on leaderless flocking controller design. We, in this paper, present the design of a sequential flocking control for multiple mobile robots, and put forward the corresponding performance evaluation method. Firstly, we briefly review the existing theories of agent-based sequential formation control;and then, transfer the agent-based flocking control strategy to the design of overall control algorithm for mobile robots, by considering the dynamics of nonholonomic mobile robot. To analyze the sequential flocking system, a flocking performance analysis method based on the least stability time (LST) is proposed. Simulations of real problems illustrate the processes of control and analysis of a multiple mobile robots sequential flocking system. The simulation results demonstrate the efficacy of our proposed procedure.

关键词： Mobile robots

来源：评论

学校读者我要写书评

暂无评论

Anomalous Temperature Dependence of the Casimir Force for Thin Metal Films

引用

Physical Review Letters 2008年第9期101卷 096803-096803页

作者： V. A. Yampol’skii Sergey Savel’ev Z. A. Mayselis S. S. Apostolov Franco Nori Advanced Science Institute The Institute of Physical and Chemical Research (RIKEN) Wako-shi Saitama 351-0198 Japan and Department of Physics Center for Theoretical Physics Applied Physics Program Center for the Study of Complex Systems University of Michigan Ann Arbor Michigan 48109-1040 USA

Within the framework of the Drude dispersive model, we predict an unusual nonmonotonic temperature dependence of the Casimir force for thin metal films. For certain conditions, this force decreases with temperature due to the decrease of the metallic conductivity, whereas the force increases at high temperatures due to the increase of the thermal radiation pressure. We consider the attraction of a film to: either (i) a bulk ideal metal with a planar boundary, or (ii) a bulk metal sphere (lens). The experimental observation of the predicted decreasing temperature dependence of the Casimir force can put an end to the long-standing discussion on the role of the electron relaxation in the Casimir effect.

关键词： .nonmonotonic Experimental observation ideal metal Chemical research ANOMALOUS TEMPERATURE metal sphere thin metal metal films

来源：评论

学校读者我要写书评

暂无评论

Development and control of dolphin-like underwater vehicle

Development and control of dolphin-like underwater vehicle

引用

American Control Conference (ACC)

作者： Yonghui Hu Long Wang Junzhi Yu Jiyan Huo Yingmin Jia Languages Informatics Systems and Software Engineering Department Faculty of Computer Science Peking University Beijing China Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy of Sciences Beijing China Seventh Research Division Beihang University Beijing China

This paper is concerned with prototype development and motion control of a dolphin-like underwater robot. The propulsion and maneuvering of the robotic dolphin are realized with the flapping motion of the mechanical flippers and the combined heaving and pitching motions of the fluke. Mechanical design and control of the flipper apparatus and the flexible tail mechanism are presented. Through coordinated control of the propulsors, several swimming movements are designed. Preliminary experimental results verify the effectiveness of the proposed design scheme.

关键词： Underwater vehicles Dolphins Robot kinematics Propulsion Marine animals Motion control Tail Robot sensing systems Control systems Automotive engineering

来源：评论

学校读者我要写书评

暂无评论

New mass description in mammographies

New mass description in mammographies

引用

Workshops on Image Processing Theory, Tools and Applications, IPTA

作者： I. Cheikhrouhou K. Djemal D. Sellami H. Maaref N. Derbel Research unit on Computers Imaging Electronics and Systems CIELS National Engineering School of Sfax (ENIS) Sfax Tunisia Integrative Biology and Complex Systems Laboratory I.B.I.S.C Computer University of Evry Val d'Essonne (UEVE) France

In this article, we present a new mass description dedicated to differentiate between different mass shapes in mammography. This discrimination aims to reach a better mammography classification rate to be used by radiologists as a second opinion to make the final decision about the malignancy probability of radiographic breast images. Therefore, we used a geometrical feature which is perimeter measurement (P) and 3 morphological features which focus on mass borders by discriminating circumscribed from spiculated shapes. These features are: contour derivative variation (CDV), skeleton end points (SEP) and we propose a new one noted Spiculation (SPICUL). Their performance were evaluated one by one before collecting them for mammography classification into the 4 BIRADS categories. For classification, we used support vector machine (SVM) with Gaussian kernel as classifier for its higher performance. The accuracy of our model with contour features for classifying malignancies was 93% in the case of two class model (malignant and benign) and 85.7% in the 4 class model (BIRADS I,II,III and IV).

关键词： Mammography Support vector machines Support vector machine classification Image restoration Skeleton Breast cancer Image segmentation Image processing Biology computing Educational institutions

来源：评论

学校读者我要写书评

暂无评论

Annual business and news:: Beginning the 31st year of the Journal of Guidance, Control, and Dynamics

引用

JOURNAL OF GUIDANCE CONTROL AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

来源：评论

学校读者我要写书评

暂无评论

Adaptive response to methylation damage in Escherichia colistudied by transcriptome and proteome analyses

Adaptive response to methylation damage in Escherichia colis...

引用

13th International Biotechnology Symposium and Exhibition(第13届IUPAC国际生物工程会议)

作者： Jong Hwan Baek Nam Su Heo Mee-Jung Han Sang Yup Lee Metabolic and Biomolecular Engineering National Research Laboratory Department of Chemical (&) Biomolecular Engineering (BK21 Program) BioPracess Engineering Research Center Center for Systems and Synthetic Biotechnology and Institute for the BioCentury Republic of Korea Metabolic and Biomolecular Engineering National Research Laboratory Department of Chemical (&) Biomolecular Engineering (BK21 Program) BioPracess Engineering Research Center Center for Systems and Synthetic Biotechnology and Institute for the BioCentury Republic of Korea Department of Bio and Brain Engineering and Bioinformatics Research Center KAIST 335 Gwahangno Yuseong-gu Daejeon 305-701 Republic of Korea

来源：评论

学校读者我要写书评

暂无评论

Detecting quantum-coherent nanomechanical oscillations using the current-noise spectrum of a double quantum dot

引用

Physical Review B 2008年第21期78卷 214302-214302页

作者： Neill Lambert Franco Nori Advanced Science Institute The Institute of Physical and Chemical Research (RIKEN) Saitama 351-0198 Japan Department of Physics Center for Theoretical Physics Applied Physics Program Center for the Study of Complex Systems The University of Michigan Ann Arbor Michigan 48109-1040 USA

We consider a nanomechanical resonator coupled to a double quantum dot. We demonstrate how the finite-frequency current-noise spectrum through the double quantum dot can be used to distinguish classical and quantum behavior in the nearby nanoelectromechanical resonator. We also show how the full-frequency current-noise spectrum gives important information on the combined double quantum dot-resonator energy spectrum. Finally, we point out regimes where the quantum state of the resonator becomes squeezed and also examine the cross-correlated electron-phonon current noise.

关键词： electron-phonon interactions micromechanical resonators nanotechnology quantum dots

来源：评论

学校读者我要写书评

暂无评论

SVM synthesis by hierarchical structures of learning automata application for handwritten digits recognition

SVM synthesis by hierarchical structures of learning automat...

引用

IEEE SSD International Multi-Conference on systems, Signals and Devices

作者： Soumaya Ghorbel Maher Ben Jmeaa Mohamed Chtourou Research unit on Intelligent Control design & Optimization of complex Systems (ICOS) Sfax Engineering School University of Sfax Sfax Tunisia Development and Control of Distributed Applications (REDCAD) Sfax Engineering School University of Sfax Sfax Tunisia

In this paper, a new SVM (Support Vector Machines) synthesis method is presented. This method is based essentially on training criterion optimization of this machine by a set of hierarchical structures of learning automata. This methodology is adopted for the development of off-line isolated handwritten digits recognition system. A comparison is taken between this new approach and that of a standard approach for SVM synthesis. These two methodologies are also compared with a neural network based classification method. The obtained results show the performances of the new suggested method for SVM synthesis.

关键词： Support vector machines Automata Learning automata Training Handwriting recognition Kernel Probability distribution

来源：评论

学校读者我要写书评

暂无评论

A fault tolerant architecture for supervisory control of discrete event systems

引用

IFAC Proceedings Volumes 2008年第2期41卷 6542-6547页

作者： Andrea Paoli Matteo Sartini Stéphane Lafortune Center for Research on Complex Automated Systems (CASY) DEIS University of Bologna Viale Pepoli 3/2 − 40136 Bologna ITALY Department of Electrical Engineering and Computer Science The University of Michigan 1301 Beal Avenue Ann Arbor MI 48109-2122 USA

In this paper the problem of Fault Tolerant Control (FTC) in the framework of Discrete Event systems (DES) modeled as automata is considered. The approach we follow is the so-called active approach in which the supervisor actively reacts to the detection of a malfunctioning component in order to eventually meet degraded control specifications. Starting from an appropriate model of the system, we recall the notion of safe diagnosability as a necessary step in order to achieve fault tolerant supervision of DES. We then introduce two new notions: (i) “safe controllability”, which represents the capability, after the occurrence of a fault, of steering the system away from forbidden zones and (ii) “active fault tolerant system”, which is the property of safely continuing operation after faults. We show how it is possible to define a general control architecture to deal with the FTC problem by introducing a special kind of automaton, called a “diagnosing-controller”.

关键词： Fault tolerant control Fault diagnosis Discrete event systems Automata Supervisory control theory Safety

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：