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Segmentation of abdominal aortic aneurysms in CT images using a radial model approach

10th International Conference on Intelligent Data engineering and Automated Learning, IDEAL 2009

作者： MacÍa, Iván Legarreta, Jon Haitz Paloc, Céline Graña, Manuel Maiora, Josu García, Guillermo De Blas, Mariano Biomedical Applications Department Vicomtech Donostia-San Sebastián Spain Computational Intelligence Group Computer Science Faculty University of the Basque Country Donostia-SanSebastián Spain Electronics and Telecommunications Department Technical University School University of the Basque Country Donostia-San Sebastián Spain Engineering Systems and Automation Engineering Department Technical University School University of the Basque Country Donostia-San Sebastián Spain Interventional Radiology Service Donostia Hospital Donostia-SanSebastián Spain

ISBN: (纸本)3642043933

Abdominal Aortic Aneurysm (AAA) is a dangerous condition where the weakening of the aortic wall leads to its deformation and the generation of a thrombus. To prevent a possible rupture of the aortic wall, AAAs can be treated non-invasively by means of the Endovascular Aneurysm Repair technique (EVAR), which consists of placing a stent-graft inside the aorta in order to exclude the bulge from the blood circulation and usually leads to its contraction. Nevertheless, the bulge may continue to grow without any apparent leak. In order to effectively assess the changes experienced after surgery, it is necessary to segment the aneurysm, which is a very time-consuming task. Here we describe the initial results of a novel model-based approach for the semi-automatic segmentation of both the lumen and the thrombus of AAAs, using radial functions constrained by a priori knowledge and spatial coherency. © 2009 Springer Berlin Heidelberg.

关键词： Repair

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Solving the Euclidean Steiner Tree Problem using geometric structures

Solving the Euclidean Steiner Tree Problem using geometric s...

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14th International Conference on Soft Computing: Evolutionary Computation, Genetic Programming, Fuzzy Logic, Rough Sets, Neural Networks, Fractals, Bayesian Methods, MENDEL 2008

作者： Šeda, Miloš Brno University of Technology Faculty of Mechanical Engineering Institute of Automation and Computer Science Technická 2 Brno 616 69 Czech Republic

ISBN: (纸本)9788021436756

The Euclidean Steiner Tree Problem is to find a shortest network spanning a set of fixed points in the plane, allowing the addition of auxiliary points to the set. The problem being NP-hard, polynomial-time approximations or heuristics are required. There are many rather complex heuristics based, e.g., on enumerating full topologies and consuming long time for computations for large instances. In this paper, we applied to use tools of computational geometry, especially the properties of Delaunay triangulation, a wellknown geometric structure, and combine them with insertion heuristics based on the construction of the Euclidean minimum spanning tree. Thus an algorithm could be proposed that is very efficient and fast. Experiments confirmed that computations by this algorithm generate very good results in a reasonable amount of time, even for large instances of the studied problem.

关键词： Computational geometry

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Performance and robustness analysis of a fuzzy-immune flow controller in ATM networks with time-varying multiple time-delays

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控制理论与应用（英文版） 2008年第3期6卷 253-258页

作者： Tao REN Zhenhua GAO Weiming KONG Yuanwei JING Muyi YANG Georgi M. DIMIROVSKI Key Laboratory of Process Industry Automation of MOE and Liaoning Province Northeastern University Shenyang Liaoning 110004 China School of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China Faculty of Engineering Department of Computer Engineering Dogus University Istanbul TR-347222 Republic of Turkey

For the Asynchronous Transfer Mode （ATM） networks with time-varying multiple time-delays, a more realistic model for the available bit rate （ABR） traffic class with explicit rate feedback is introduced. A fuzzy-immune controller is designed, which can adjust the rates of ABR on-line, overcome the bad effect caused by the saturation nonlinearity and satisfy the weighted fairness. Also, the sufficient condition that guarantees the stability of the closed-loop system with a fuzzy-immune controller is presented in theory for the first time. The algorithm exhibits good performance, and most importantly, has a solid theoretical foundation and can be implemented in practice easily. Simulation results show that the control system is rapid, adaptive, robust, and meanwhile, the quality of service （QoS） is guaranteed.

关键词： ATM networks ABR traffic Time-delay Fuzzy-immune controller Robust stabilization

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Skeletonize multi width ribbon-like shapes based on difference images and frenet frame

Skeletonize multi width ribbon-like shapes based on differen...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Z. W. Liao Z. S. Wang S. X. Hu Faculty of Computer Science Sichuan Normal University Chengdu China School of Automation Engineering University of Electronic Science and Technology Chengdu China

In this paper, we propose a novel skeletonize method for multi width ribbon-like shapes. The two difference images with vertical and horizontal directions respectively are computed to locate the singularities of the original image. Then the gradient directions of these singularity points are computed. The skeletonization can be obtained by finding the centers of via pair wise singularity points using their gradient directions. The most attracting nature of this method is that it can handle multi width shapes, which is very difficult in conventional methods. The experimental results show that our method is a ldquogoodrdquo method closing to human conception.

关键词： Shape Skeleton Humans Noise shaping Pattern recognition Optical character recognition software computer science automation Image analysis Image segmentation

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A directional detector for edge based on difference images

A directional detector for edge based on difference images

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IEEE International Conference on Systems, Man and Cybernetics

作者： S. X. Hu Z. S. Wang Z. W. Liao School of Automation Engineering University of Electronic Science and Technology Chengdu China Faculty of Computer Science Sichuan Normal University Chengdu China

In this paper, we propose a novel method for edge detection based on difference images. In order to increase the ability of difference images in direction detection, we propose a maximum modulus technique, whose singularities are located both by the gray differences and maximum gradient directions. That is, the singularities are located along the gradient directions with maximum difference modulus. The whole framework both on theory and application is given in this paper. Experiments show that the new technique has very good visual behaves.

关键词： Image edge detection Detectors Filters Filtering computer science Noise reduction Image converters automation Application software computer vision

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The Taylor series — Local iterative linearization method for numerical modeling and simulation of linear processes

The Taylor series — Local iterative linearization method fo...

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IEEE International Conference on automation, Quality and Testing, Robotics, AQTR

作者： T. Colosi M. Abrudean M.L. Unguresan Faculty of Automation and Computer Science Technical University of Cluj Napoca Romania Faculty of Materials Science and Engineering Department of Chemistry Technical University of Cluj Napoca Romania

The paper presents a possible version of systemic approach to model and simulate linear, time invariant processes, highlighting the unitary and systematized character of the procedure. The results can be extended for ... 详细信息

关键词： Taylor series Approximation methods Calculus Computational modeling Vectors Mathematical model Equations

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Characteristics comparison of motion controllers through experiments

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Journal of Institute of Control, Robotics and Systems 2008年第11期14卷 1094-1102页

作者： Jung, Seung Hyun Wang, Jun Han, Chang Wook Park, Jung-Il Automation Technology Senior Researcher Korea Textile Machinery Research Institute Gyeongsan Korea Republic of School of Electronic Engineering University of Electronic Science and Technology of China China School of Electrical Engineering and Computer Science Yeungnam University Korea Republic of Faculty of the School of Electrical Engineering and Computer Science Yeungnam University Korea Republic of

Through the motion control experiment using Industrial Emulator(Model 220 by ECP), the performance comparison of three kinds of controllers such as PID, RIC and LQR was carried out. It was shown that RIC has the best performance in the presence of disturbances such as step one, sinusoidal one and Coulomb friction for the rigid body. LQR using feedback state variables has the best tracking performance for the flexible body. The performance of PID controller is low compared to other controllers, but the design process is simple. The most advanced controller is LQR. In order to attenuate disturbance, an additional state observer should be used to estimate it, making more complex control system. RIC lies between PID and LQR in view of complexity of design. Even though RIC is not complicated, it has good disturbance rejection ability and less tracking error. By considering these aspects, the RIC is suggested as high precision controller to be used in motion control system.

关键词： Disturbance rejection

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Adaptive observer based actuator fault diagnosis for ASV

Adaptive observer based actuator fault diagnosis for ASV

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3rd International Conference on Innovative Computing Information and Control, ICICIC'08

作者： Wang, Jianfei Jiang, Bin Shi, Peng Wang, Hankang College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Faculty of Advanced Technology University of Glamorgan Pontypridd CF37 1DL United Kingdom Department of Computer Science VII: Robotics and Telematics Universtity of Würzburg 97074 Würzburg Germany

ISBN: (纸本)9780769531618

This paper deals with the actuator fault diagnosis and accommodation problem for the aero space vehicle (ASV). A novel nonlinear robust adaptive observer is developed for estimation of the actuator fault under the lipschitz condition on the nonlinear part of such systems, which is used to continuously accommodate the control signal, so as to ensure the stability of faulty system. Finally, simulation results about ASV are presented to illustrate the feasibility and effectiveness of the proposed methods. © 2008 IEEE.

关键词： Fault detection

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Adaptive Observer Based Actuator Fault Diagnosis for ASV

Adaptive Observer Based Actuator Fault Diagnosis for ASV

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International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Jianfei Wang Bin Jiang Peng Shi Hankang Wang College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China Faculty of Advanced Technology University of Glamorgan Pontypridd UK Department of Computer Science VII: Robotics and Telematics University of Wurzburg Wurzburg Germany

This paper deals with the actuator fault diagnosis and accommodation problem for the aero space vehicle (ASV). A novel nonlinear robust adaptive observer is developed for estimation of the actuator fault under the Lipschitz condition on the nonlinear part of such systems, which is used to continuously accommodate the control signal, so as to ensure the stability of faulty system. Finally, simulation results about ASV are presented to illustrate the feasibility and effectiveness of the proposed methods.

关键词： Fault diagnosis Actuators Observers Estimation Algorithm design and analysis Robustness Adaptive systems

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Pointwise Logic on Completely Distributive Lattices and Approximate Reasoning

Pointwise Logic on Completely Distributive Lattices and Appr...

引用

International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Yalin Zheng Guang Yang Jing Zheng Jinsheng Xing State Key Laboratory for Intelligent Technology and Systems Department of Automation Faculty of Information Science and Technology Tsinghua University Beijing China Research Center of Intelligent Information Technology Department of Computer Science and Technology Faculty of Software Dongguan University of Science and Technology Dongguan China Research Center of Dongguan Economy Department of Economy and Commerce Dongguan University of Science and Technology Dongguan China Faculty of Mathematics and Computer Science Shanxi Normal University Linfen China Research Center of System Engineering Faculty of Electronic and Information Engineering Xi'an Jiaotong University Xi'an China

In this paper, we propose the basic framework of point- wise topological logic on completely distributive lattices and explore approximate reasoning in it. The logic of this paper is based on pointwise characterization, therefore the pointwise conception is pervasive. We explore approximate reasoning in abstract logical framework Fl on completely distributive lattice L. We propose the structure of point- wise topological logic F TL , the structure of matching function sigma. and the structure of matching neighborhood group. We investigate approximate reasoning in pointwise topological logic F TL with matching function sigma, develop pointwise topological algorithm of simple approximate reasoning, introduce the essential characteristics of this scheme.

关键词： Lattices Fuzzy logic computer science Knowledge engineering Fuzzy systems Information technology Laboratories Intelligent systems automation Information science

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