检索结果-内蒙古大学图书馆

A manually-actuated MRI compatible robotic manipulator for image-guided interventions

Physica Medica 2014年 30卷 e55-e56页

作者： Eftychios G. Christoforou Christoforos Keroglou Andrew Webb Nikolaos V. Tsekos Ioannis Seimenis KIOS Research Center for Intelligent Systems and Networks University of Cyprus Cyprus Department of Electrical and Computer Engineering University of Cyprus Cyprus C.J. Gorter Center for High Field MRI Leiden University Medical Center Leiden Netherlands Medical Robotics Laboratory University of Houston Houston TX USA Med. Physics Lab Medical School Democritus University of Thrace Alexandroupolis Greece

来源：评论

学校读者我要写书评

暂无评论

An Investigation on the Accuracy of Regional Ocean Models Through Field Trials

An Investigation on the Accuracy of Regional Ocean Models Th...

引用

IEEE International Conference on robotics and automation

作者： Ryan N. Smith Kimia Nazarzadeh Jonathan Kelly Gaurav S. Sukhatme School of Electrical Engineering and Computer Science Queensland University of Technology Brisbane QLD 4001 Australia. Robust Robotics Group Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge MA 02142 USA. Robotic Embedded Systems Laboratory Department of Computer Science University of Southern California Los Angeles CA 90089 USA.

ISBN: (纸本)9781467356404

Recent efforts in mission planning for underwater vehicles have utilised predictive models to aid in navigation, optimal path planning and drive opportunistic sampling. Although these models provide information at a unprecedented resolutions and have proven to increase accuracy and effectiveness in multiple campaigns, most are deterministic in nature. Thus, predictions cannot be incorporated into probabilistic planning frameworks, nor do they provide any metric on the variance or confidence of the output variables. In this paper, we provide an initial investigation into determining the confidence of ocean model predictions based on the results of multiple field deployments of two autonomous underwater vehicles. For multiple missions of two autonomous gliders conducted over a two-month period in 2011, we compare actual vehicle executions to simulations of the same missions through the Regional Ocean Modeling System in an ocean region off the coast of southern California. This comparison provides a qualitative analysis of the current velocity predictions for areas within the selected deployment region. Ultimately, we present a spatial heat-map of the correlation between the ocean model predictions and the actual mission executions. Knowing where the model provides unreliable predictions can be incorporated into planners to increase the utility and application of the deterministic estimations.

关键词： Regional Ocean Models Through Field Trials mission planning underwater vehicles

来源：评论

学校读者我要写书评

暂无评论

Complex Dynamical Behavior of a Two-Stage Colpitts Oscillator with Magnetically Coupled Inductors

引用

Journal of Chaos 2014年第1期2014卷

作者： V. Kamdoum Tamba H. B. Fotsin J. Kengne F. Kapche Tagne P. K. Talla Department of Physics Laboratory of Electronics and Signal Processing (LETS) Faculty of Science University of Dschang P.O. Box 67 Dschang *** Department of Telecommunication and Network Engineering IUT-Fotso Victor of Bandjoun University of Dschang P.O. Box 134 Bandjoun *** Department of Electrical Engineering Laboratory of Automation and Applied Computer (LAIA) IUT-Fotso Victor of Bandjoun University of Dschang P.O. Box 134 Bandjoun *** Department of Physics Laboratory of Mechanics and Modelling of Physical Systems (L2MPS) Faculty of Science University of Dschang P.O. Box 67 Dschang ***

A five-dimensional (5D) controlled two-stage Colpitts oscillator is introduced and analyzed. This new electronic oscillator is constructed by considering the well-known two-stage Colpitts oscillator with two further elements (coupled inductors and variable resistor). In contrast to current approaches based on piecewise linear (PWL) model, we propose a smooth mathematical model (with exponential nonlinearity) to investigate the dynamics of the oscillator. Several issues, such as the basic dynamical behaviour, bifurcation diagrams, Lyapunov exponents, and frequency spectra of the oscillator, are investigated theoretically and numerically by varying a single control resistor. It is found that the oscillator moves from the state of fixed point motion to chaos via the usual paths of period-doubling and interior crisis routes as the single control resistor is monitored. Furthermore, an experimental study of controlled Colpitts oscillator is carried out. An appropriate electronic circuit is proposed for the investigations of the complex dynamics behaviour of the system. A very good qualitative agreement is obtained between the theoretical/numerical and experimental results.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A fuzzy maximum power point tracker for photovoltaic systems

A fuzzy maximum power point tracker for photovoltaic systems

引用

IASTED International Conference on Control and Applications, CA 2012

作者： Karagiannis, Ioannis E. Groumpos, Peter P. Laboratory for Automation and Robotics Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece

ISBN: (纸本)9780889869226

Global energy demand has increased enormously in recent years. Photovoltaic (PV) systems is a promising energy source. PV characteristics are briefly outlined. A conventional Maximum Power Point Tracker (MPPT) takes into consideration the optimum performance the PV system can score in Standard Test Conditions (STC). A new Fuzzy Maximum Power Point Tracker is developed in order to achieve interaction with real environmental parameters (external conditions). To improve the system's performance, the proposed Fuzzy Logic Controller (FLC) allows the PV system to adapt to environmental conditions by taking into consideration current load, insolation, temperature, wind and possible shades covering the photovoltaic panels. Simulation results confirm the effectiveness and usefulness of the proposed new Fuzzy MPPT system.

关键词： Maximum power point trackers

来源：评论

学校读者我要写书评

暂无评论

Mathematical modeling of control systems using Fuzzy Cognitive Maps: Challenging issues

Mathematical modeling of control systems using Fuzzy Cogniti...

引用

IASTED International Conference on Control and Applications, CA 2012

作者： Groumpos, Peter P. Laboratory for Automation and Robotics Department of Electrical and Computer Engineering University of Patras 26500 Rion Patras Greece

ISBN: (纸本)9780889869226

The challenging problem of modeling and analyzing complex control systems is investigated using advanced methods of Fuzzy Cognitive Maps. Challenges issues of mathematical modeling in general control systems are briefly reviewed and the problems arised using standard control method in the presence of uncertainty are presented. The need to model hierarchical systems using new and advanced methods based on Fuzzy systems and Soft Computing is demonstrated. The issue of modeling two-level structural hierarchical systems is discussed and such a system is modeled using FCMS. An example from the pharmaceutical industries is used to prove the usefulness of using FCMs. Simulation results are given and interesting conclusions are provided.

关键词： Fuzzy Cognitive Maps

来源：评论

学校读者我要写书评

暂无评论

Experiment on Bifurcation and Chaos in Coupled Anisochronous Self-Excited systems: Case of Two Coupled van der Pol-Duffing Oscillators

引用

Journal of Nonlinear Dynamics 2014年第1期2014卷

作者： J. Kengne F. Kenmogne V. Kamdoum Tamba Laboratory of Automation and Applied Computer (LAIA) Department of Electrical Engineering IUT-FV Bandjoun University of Dschang P.O. Box 134 Bandjoun *** Institute for Smart-Systems Technologies University of Klagenfurt Universitätsstraße 65 9020 Klagenfurt Austriauni-klu.ac.at Department of Physics University of Yaoundé 1 P.O. Box 8390 Yaoundé Cameroonuy1.uninet.cm Laboratory of Electronics Department of Physics University of Dschang P.O. Box 134 Bandjoun ***

The analog circuit implementation and the experimental bifurcation analysis of coupled anisochronous self-driven systems modelled by two mutually coupled van der Pol-Duffing oscillators are considered. The coupling between the two oscillators is set in a symmetrical way that linearly depends on the difference of their velocities (i.e., dissipative coupling). Interest in this problem does not decrease because of its significance and possible application in the analysis of different, biological, chemical, and electrical systems (e.g., coupled van der Pol-Duffing electrical system). Regions of quenching behavior as well as conditions for the appearance of Hopf bifurcations are analytically defined. The scenarios/routes to chaos are studied with particular emphasis on the effects of cubic nonlinearity (that is responsible for anisochronism of small oscillations). When monitoring the control parameter, various striking dynamic behaviors are found including period-doubling, symmetry-breaking, multistability, and chaos. An appropriate electronic circuit describing the coupled oscillator is designed and used for the investigations. Experimental results that are consistent with results from theoretical analyses are presented and convincingly show quenching phenomenon as well as bifurcation and chaos.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Single intersection signal control based on Type-2 fuzzy logic

Single intersection signal control based on Type-2 fuzzy log...

引用

IEEE Symposium on Computational Intelligence in Vehicles and Transportation systems (CIVTS)

作者： Yunrui Bi Dipti Srinivasan Xiaobo Lu Zhe Sun Southeast University Nanjing Jiangsu CN Department of Electrical & Computer Engineering National University of Singapore Singapore School of Automation Southeast University Nanjing China National Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou China

Single intersection is generally regarded as the elementary unit for solving traffic problem. A Type-2 fuzzy logic controller (T2FLC) for single intersection signal control is presented in this paper as Type-2 fuzzy logic can handle the imprecision, uncertainties and vagueness lying in the dynamic process more efficiently. Furthermore, the membership function parameters of Type-2 fuzzy logic controller are optimized by genetic algorithm (GA). Simulation experiments are designed to compare the queue length and vehicular average delay of Type-2 fuzzy control optimized by GA with general Type-2 fuzzy control, Type-1 fuzzy control and fixed-time control under various types of vehicle arrival rate. Experimental results indicate that our proposed control method can reduce the queue length and vehicular delay at the intersection effectively and thus demonstrates its superiority.

关键词： Vehicles Fuzzy logic Genetic algorithms Delays Optimization Junctions Educational institutions

来源：评论

学校读者我要写书评

暂无评论

Fractional-Order Complementary Filters for Small Unmanned Aerial System Navigation

Fractional-Order Complementary Filters for Small Unmanned Ae...

引用

International Conference on Unmanned Aircraft systems

作者： Calvin Coopmans Austin M. Jensen YangQuan Chen Department of Electrical and Computer Engineering Utah State University Logan Utah 84321 Utah Water Research Laboratory Utah State University Logan Utah 84321 Mechatronics Embedded Systems and Automation (MESA) Lab University of California Merced Merced CA 95343

ISBN: (纸本)9781479908158

Orientation estimation is very important for development of unmanned aerial systems (UASs), and is performed by combining data from several sources and sensors. Kalman filters are widely used for this task, however they typically assume linearity and Gaussian noise statistics. While these assumptions work well for high-quality, high-cost sensors, it does not work as well for low-cost, low-quality sensors. For low-cost sensors, complementary filters can be used since no assumptions are made with regards to linearity and noise statistics. In this paper, the concepts of filtering based on fractional-order calculus are applied to the complementary filter, and the efficacy of non-integer-order filtering on systems with non-gaussian noise is explored with good success.

关键词： Fractional Order Calculus Fractional Order Filtering Unmanned Aerial Vehicles (UAV) Complementary Filters Alpha-stable non-Gaussian Combining filter Navigation Vertical Take-Off and Landing (VTOL)

来源：评论

学校读者我要写书评

暂无评论

Meanshift algorithm based on kernel bandwidth adaptive adjust

Meanshift algorithm based on kernel bandwidth adaptive adjus...

引用

Chinese Control Conference (CCC)

作者： Yunji Zhao Hailong Pei Baoluo Liu School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 China Key Laboratory of Autonomous Systems and Networked Control (South China University of Technology) Ministry of Education Guangzhou 510640 China Department of Computer and Information Engineering Luoyang Institute of Science and Technology Henan 471023 China

Object tracking algorithm based on Meanshift algorithm with fixed kernel bandwidth does not realize object tracking correctly with the scale of object changed. According to this, a scheme of kernel bandwidth adaptive adjustment and predictions of object cancroids based on Kalman filter is proposed in this paper. In this algorithm, Object location predicted based on Kalman filter is used to initialize the Meanshift algorithm. The variation tendency of the kernel bandwidth is also determined based on Kalman filter. Experiment results demonstrate that this algorithm can realize the kernel bandwidth adaptive adjustment and object location prediction. The robustness of the tracking algorithm is also enhanced.

关键词： Prediction algorithms Kalman filters Electronic mail Kernel Bandwidth Robustness Conferences

来源：评论

学校读者我要写书评

暂无评论

Potential Function Based Multi-Agent Formation Control in 3D Space

引用

IFAC Proceedings Volumes 2012年第22期45卷 682-689页

作者： Marko Bunic Stjepan Bogdan University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering LARICS–Laboratory for Robotics and Intelligent Control Systems Zagreb Croatia

This paper presents the extension of the previously proposed method for multi-agent formation control based on potential function. The method derived for 2D space is extended to 3D. It has been shown that the control algorithm keeps all the properties of the original scheme in case of multi-agent formation moving in 3D. An adaptation mechanism that assures avoidance of unwanted stable equilibria, used in 2D, is implemented in the same form for 3D formations. The obtained simulation results demonstrate stable behavior of the system for various sets of parameters - the desired 3D formation is reached in finite time and maintained during trajectory execution.

关键词：

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：