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检索条件"机构=Center for Control Engineering and Computation Department of Electrical and Computer Engineering"

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An interactive system for heterogeneous 3D volumetric data visualization

An interactive system for heterogeneous 3D volumetric data v...

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International Conference on computer Science and Education

作者： Xu, Huanhuan Yu, Wuyi Wei, Li Zhang, Ning Li, Xin Electrical and Computer Engineering Louisiana State University Baton Rouge LA 70803 United States Center for Computation and Technology Louisiana State University Baton Rouge LA 70803 United States Department of Automation Xiamen University Xiamen Fujian 361005 China

ISBN: (纸本)9781424460052

With the development of 3D scanning and imaging technologies, large amount of 3D surface and volumetric geometric data have been routinely collected these days. Compared with surface data, volumetric data are usually equipped with rich material, texture, intensity, and other heterogeneous structural information in their interior regions. Effectively visualizing such information can be very important since it facilitates many data analysis tasks. This paper studies the effective visualization of heterogeneous volumetric data which can have not only geometry but also other equipped scalar fields. We have developed an interactive system that can efficiently visualize the geometry and scalar field simultaneously via different cross-sections. A simple data structure used for handling large-scale 3D data is presented. Vector fields on the volumetric data such as 3D mapping, B-Spline fitting and fitting error field can also be effectively visualized in our framework. Effectiveness of our system is demonstrated and compared with existing volumetric data rendering system. ©2010 IEEE.

关键词： Mapping

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A statistical shape model using 2D-principal component analysis from few medical samples and its evaluation

A statistical shape model using 2D-principal component analy...

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2nd International Conference on Software engineering and Data Mining, SEDM 2010

作者： Tateyama, Tomoko Tanaka, Taishi Kohara, Shinya Foruzan, Amir Hossein Furukawa, Akira Chen, Yen-Wei Intelligent Image Processing Lab College of Information Science and Engineering Ritsumeikan University Shiga Japan Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Radiology Shiga University of Medical Science Shiga Japan

ISBN: (纸本)9788988678213

Since the medical training samples are very limited, it is difficult to construct a statistical shape model with good generalization using few samples. In this paper, we propose a novel statistical shape modeling method using 2D PCA. The 3D shape is represented as a matrix by spherical parameterization. The experiments showed that our proposed method can reconstruct statistical shape model with good generalization even using fewer samples.

关键词： Principal component analysis

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Multi-scale approach for retinal vessel segmentation using medialness function

Multi-scale approach for retinal vessel segmentation using m...

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IEEE International Symposium on Biomedical Imaging

作者： Elahe Moghimirad Seyed Hamid Rezatofighi Hamid Soltanian-Zadeh Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424441259;9781424441266

Automated segmentation of retinal vessels in optic fundus images has been the most prevailing effort in many researches during recent years. In this paper, we propose a multi-scale method based on a weighted 2D medialness function. The result of the medialness function is first multiplied by the eigenvalues of the Hessian matrix in every pixel of the image in order to extract vessel's medial-lines. Next, by extracting the centerlines of vessels and estimation of radius of vessels, the retinal vessels are segmented. Finally, the performance of our proposed method is evaluated by the DRIVE and STARE databases and compared with those of several recent methods.

关键词： Retinal vessels Image segmentation Eigenvalues and eigenfunctions Retina Filters Image databases Blood vessels Biomedical imaging Vectors Pathology

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A parametric periodic Lyapunov equation with application in semi-global stabilization of discrete-time periodic systems subject to actuator saturation

A parametric periodic Lyapunov equation with application in ...

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作者： Zhou, Bin Duan, Guang-Ren Lin, Zongli Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin Heilongjiang 150001 China Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22904-4743 United States

ISBN: (纸本)9781424474264

This paper is concerned with semi-global stabilization of discrete-time linear periodic systems subject to actuator saturation. Provided that the open loop characteristic multipliers are within the closed unit circle, a low gain feedback design approach is proposed to solve the problem by state feedback. Our approach is based on the solution to a parametric discrete-time periodic Lyapunov equation. The proposed approaches not only generalize the corresponding results for time-invariant systems to periodic systems, but also reveal some important intrinsic properties of this class of periodic matrix equations. A numerical example is worked out to illustrate the effectiveness of the proposed approaches. © 2010 AACC.

关键词： State feedback

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Comparison of voxel-based morphometry (VBM) and tractography of diffusion tensor MRI (DT-MRI) in temporal lobe epilepsy

Comparison of voxel-based morphometry (VBM) and tractography...

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2010 18th Iranian Conference on electrical engineering, ICEE 2010

作者： Afzali, Maryam Soltanian-Zadeh, Hamid Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran 14395-515 Iran Image Analysis Laboratory Radiology Department Henry Ford Health System Detroit MI 48202 United States

ISBN: (纸本)9781424467600

Temporal lobe epilepsy (TLE) is a neurological disease that affects millions of individuals in the world. Majority of TLE patients suffer from refractory seizures. Determining abnormal/damaged regions of the brain that harbor seizure focus is a critical step towards treatment of TLE patients. Diffusion tensor imaging (DTI) is a non-invasive method that we use in this work to determine damaged regions of white matter in the brain. To this end, we apply two methods, voxel based morphometry (VBM) and fiber tracking. We use these methods along with two anisotropy maps (EAR and FA) extracted from the DTI data. We use DTI data of 31 subjects (12 normal subjects and 19 TLE patients) for testing and evaluation studies. The VBM method shows that TLE is associated with reduction of both of FA and EAR values in several regions within the temporal lobes. The tractography method shows abnormal diffusion characteristics in three fiber bundles (fornix, uncinate fasciculus, and cingulum). The results show that the EAR maps are less sensitive to noise than the FA maps and the EAR values change more than the FA values in TLE. ©2010 IEEE.

关键词： Diffusion tensor imaging

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An Algorithm for Discrete State Sequence and Trajectory Optimization for Hybrid Systems with Partitioned State Space

An Algorithm for Discrete State Sequence and Trajectory Opti...

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2010 49th IEEE Conference on Decision and control

作者： Benjamin Passenberg Marion Sobotka Olaf Stursberg Martin Buss Peter E. Caines Institute of Automatic Control Department of Electrical Engineering and Information Technology Technische Universitat Munchen Munchen Germany Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel Kassel Germany Department of Electrical and Computer Engineering and the Center for Intelligent Machines McGill University Montreal Canada

ISBN: (纸本)9781424477456

An algorithm for hybrid optimal control is proposed that varies the discrete state sequence based on gradient information during the search for an optimal trajectory. The algorithm is developed for hybrid systems with partitioned state space. It uses a version of the hybrid minimum principle that allows optimal trajectories to pass through intersections of switching manifolds, which enables the algorithm to vary the sequence. Consequently, the combinatorial complexity of former algorithms can be avoided, since not each possible sequence has to be investigated separately anymore. The convergence of the algorithm is proven and a numerical example demonstrates the efficiency of the algorithm.

关键词： Switches Manifolds Trajectory Complexity theory Partitioning algorithms Convergence Aerospace electronics

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The Minimum Principle for Hybrid Systems with Partitioned State Space and Unspecified Discrete State Sequence

The Minimum Principle for Hybrid Systems with Partitioned St...

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2010 49th IEEE Conference on Decision and control

作者： Benjamin Passenberg Peter E. Caines Marion Sobotka Olaf Stursberg Martin Buss Institute of Automatic Control Department of Electrical Engineering and Information Technology Technische Universitat Munchen Munchen Germany Department of Electrical and Computer Engineering and the Center for Intelligent Machines McGill University Montreal Canada Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel Kassel Germany

ISBN: (纸本)9781424477456

The hybrid minimum principle (HMP) gives necessary conditions to be satisfied for optimal solutions of a hybrid dynamical system. In particular, the HMP accounts for autonomous switching between discrete states that occurs whenever the trajectory hits switching manifolds. In this paper, the existing HMP is extended for hybrid systems with partitioned state space to provide necessary conditions for optimal trajectories that pass through an intersection of switching manifolds. This extension is especially useful for the numerical solution of hybrid optimal control problems as it allows for algorithms with significant reduction of computational complexity. Algorithms based on previous versions of the HMP solve separate optimal control problems for each possible sequence of discrete states. The extension enables us to consider the optimal sequence as subject of optimal control that is varied and finally determined during a single optimization run. A first numerical result illustrates the effectiveness of an algorithm based on the extended HMP.

关键词： state space minimum principle hybrid systems Manifolds Optimal control DYNAMICAL SYSTEMS discrete element

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Decision making strategy in the designing of a fuzzy controller for inverted pendulum-cart system

Decision making strategy in the designing of a fuzzy control...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： S. Khailaie P. Bahmanyar Caro Lucas Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Electrical Engineering Faculty of Engineering Ferdowsi University of Mashhad Mashhad Iran

In this paper, a multi-objective heuristic-based method of design of a fuzzy controller for an inverted pendulum-cart system is investigated. A heuristic search optimization called “Imperialist Competitive Algorithm” is proposed to be used in generating and optimizing the fuzzy rules engine. The main purpose of this paper is to design a model-free nonlinear controller for inverted pendulum-cart system which can regulate a wide range of initial conditions and minimize a pre-defined quadratic performance index by taking into account the physical system constraints. Also the system constraints are proposed to be coded using Pontryagin method. All the objectives and system constraints are assumed to be fuzzy objectives and fuzzy constraints. The simulation results show the effectiveness of the proposed algorithm in problem objectives and constraints satisfaction compared to the optimal linear and nonlinear controller.

关键词： Performance analysis Mathematical model Optimization Decision making Indexes Equations Approximation methods

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Active disturbance rejection control for non-minimum phase systems

Active disturbance rejection control for non-minimum phase s...

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Chinese control Conference (CCC)

作者： Shen Zhao Zhiqiang Gao Center for Advanced Control Technologies Department of Electrical and Computer Engineering Cleveland State University OH 44115 USA

Active disturbance rejection control (ADRC) has been applied to solve various types of control problems across many engineering disciplines, but largely within the confine of minimum phase systems. This paper, however, explores systematically its applications to non-minimum phase (NMP) systems, particularly those with transfer functions that have right half plane zeros. It is first shown that, a regular ADRC controller, if not tuned carefully, could easily yield an undesirable solution for NMP systems. We then demonstrate the reasons behind the difficulty using transfer function analysis, leading to a solution in how we tune the ADRC for NMP systems. In particular, a systematic design and tuning procedure is obtained based on the relationship between the high frequency gain of the system and the controller bandwidth. Finally, the proposed method allows a user to easily make a tradeoff between the undershoot, which is unique in NMP systems, and the response time, using the frequency response method of gain and phase compensation.

关键词： Bandwidth Observers Transfer functions control systems Tuning Simulation Frequency domain analysis

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RETRACTED ARTICLE: Remote access of building management system on windows mobile devices

RETRACTED ARTICLE: Remote access of building management syst...

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2010 International Conference on Networking and Information Technology, ICNIT 2010

作者： Krejcar, Ondrej Horkem, Jindrich Department of Measurement and Control Center for Applied Cybernetics VSB Technical University of Ostrava 17. Listopadu 15 70833 Ostrava-Poruba Czech Republic Department of Measurement and Control Faculty of Electrical Engineering and Computer Science VSB Technical University of Ostrava 17. Listopadu 15 70833 Ostrava-Poruba Czech Republic

ISBN: (纸本)9781424475773

The purpose of this project is to allow a free movement of Building Management System (BMS) operator in all controlled building area. The current state of the problem consists in an impossibility of operator's movement from control centre. We found a solution in using of mobile devices like PDA with a client of BMS to allow a remote access to all alarms of system. Solution consist in use of web services and web methods interface on BMS server, where is possible to connect a remote PDA client to interchange a requested info about alarms and trends. A web services and mobile client application was created using a Microsoft Visual Studio 2008. Future trends are also discussed to provide a solution for small and mid size constructions in direction of use a Microsoft .NET Micro Framework. © 2010 IEEE.

关键词： Web services

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