检索结果-内蒙古大学图书馆

International Workshop on Advanced Computational intelligence (IWACI)

作者： Z. Chen J. G. Liu G. Y. Wang Intelligence Control Institute for Pattern Recognition and Artificial Intelligence and Multi-Spectral Information Processing State Key Laboratory Huazhong University of Science and Technology China Intelligence Control Institute for Pattern Recognition and Artificial Intelligence and Multi-Spectral Information Processing State Key Laboratory Huazhong University of Science and Technology China

According to the drawback of the traditional circle target extraction algorithm from high resolution remote sensing imagery used by Hough Transform, such as computation complexity, low efficiency and etc, a new circle target extraction method is proposed in this paper which can extract multiple circle targets with different radius at one time. First, the Average Absolute Difference is implemented to enhance the edge of the circle targets and suppress the noise of the background. Secondly, the locally self-adaptive segmentation algorithm is implemented to obtain the binary image. Thirdly, the thinning algorithm based on model computation is implanted to obtain the single pixel edge of the circle targets and in order to reduce the computation times in the following process. Furthermore, a pruning algorithm is necessary; finally, a modified Hough transform algorithm is proposed to obtain the circle targets. The experimental results demonstrate that the new circle targets algorithm can extract the multiple circle targets quickly and accurately, which has three advantages: low time consuming, high detection rate, robust to noise and fragmentary boundaries.

关键词： Transforms Image edge detection Noise Skeleton Image segmentation Remote sensing Accuracy

来源：评论

学校读者我要写书评

暂无评论

Statistical Boundary Extraction Base on Quantum Particle Motion

Statistical Boundary Extraction Base on Quantum Particle Mot...

引用

International Conference on Intelligent Computation and Bio-Medical Instrumentation (ICBMI)

作者： Yangguang Sun Mingyue Ding College of Computer Science South-Central University for Nationalities Image Processing and Intelligence Control Key Laboratory of Education Ministry of China Huazhong University of Science and Technology Wuhan China College of Life Science and Technology Image Processing and Intelligence Control Key Laboratory of Education Ministry of China Huazhong University of Science and Technology Wuhan China

A novel statistical method was proposed for boundary extraction of interested objects in this letter. The proposed method was inspired by the physical nature of quantum and the statistical property of wave function. By introducing the polymer representation of quantum particle and based on quantum particle motion in the gradient-based image potential field, the boundary extraction was realized in our method. Experimental results demonstrated that our method has the capability to make the boundary extraction with arbitrary initialization and topology changes possible.

关键词： Quantum mechanics Wave functions Educational institutions Polymers Monte Carlo methods Deformable models Probability distribution

来源：评论

学校读者我要写书评

暂无评论

Distributed Robust control of Spatially Interconnected Systems with Parameter Uncertainty

Distributed Robust Control of Spatially Interconnected Syste...

引用

IEEE Conference on Decision and control

作者： Huang Huang Qinghe Wu Beijing Institute of Control Engineering and Science and Technology on Space Intelligent Control Laboratory Beijing China School of Automation Beijing Institute of Technology Beijing China

ISBN: (纸本)9781612848006

This paper addresses the problem of robust control of spatially interconnected systems (SISs) subject to both exogenous disturbances and time-varying norm-bounded parameter uncertainties. A sufficient condition to the well-posedness, stability and attractiveness of an SIS with respect to all admissible uncertainties is presented in terms of a set of matrix inequalities. For the synthesis of distributed dynamic output feedback controllers, the nominal system is expanded in its output space so as to eliminate the uncertainties in the system matrices. In reference to the standard distributed scaled H_(infinity) control, the synthesis of distributed robust H_(infinity) controllers is proposed based on the system model in the expanded space. Numerical examples validate the effectiveness of the method.

关键词： parameter uncertainty Robust control large-scale systems Distribute synthesis Systems modelling Output feedback controllers

来源：评论

学校读者我要写书评

暂无评论

A High Gain Integral Dynamic Compensation Method for Nonlinear Missile control

引用

IFAC Proceedings Volumes 2011年第1期44卷 2048-2053页

作者： Zhang Zhao Hu Jun National Key Laboratory of Science and Technology on Space Intelligent Control Beijing 100190 P.R.China Beijing Institute of Control Engineering Beijing 100190 P.R.China

Abstract A high gain integral dynamic compensation method for a missile pitch motion autopilot design is proposed. The external disturbances and model mismatch are lumped into an unknown input term, and then a high gain integral observer is constructed for the estimation of this term. Through the singular perturbation theory, it is concluded that with the control direction known and the integral gain high enough, the observer output can converge to the unknown input fast enough. The Lyapunov analysis also shows the bounded stability of the closed loop system. Numerical simulation results demonstrate this simple method improves the nominal tracking performance and robustness of dynamic inversion controller against unmodeled dynamics and external disturbances.

关键词： high gain integral dynamic compensation pitch autopilot unknown input singular perturbation

来源：评论

学校读者我要写书评

暂无评论

Attitude Tracking of Rigid spacecraft With Bounded Disturbances

引用

IEEE Transactions on Industrial Electronics 2011年第2期58卷 647-659页

作者： Yuanqing Xia Zheng Zhu Mengyin Fu Shuo Wang Department of Automatic Control Beijing Institute of Technology Beijing China Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy and Sciences Beijing China

The problem of attitude control for a spacecraft model that is nonlinear in dynamics with inertia uncertainty and external disturbance has been investigated. Adaptive law and extended state observer are applied to estimate the disturbance, by which sliding-mode controllers are designed to combine the two approaches in order to force the state variables of the closed-loop system to converge to the reference attitude states. Also, simulation results are presented to illustrate the effectiveness of the control strategies.

关键词： space vehicles Sliding mode control Nonlinear dynamical systems Uncertainty Programmable control Adaptive control Observers State estimation Force control control systems

来源：评论

学校读者我要写书评

暂无评论

Time-varying sliding mode control for spacecraft attitude tracking maneuvers with a quadratic cost

Time-varying sliding mode control for spacecraft attitude tr...

引用

Chinese control Conference (CCC)

作者： Binglong Cong Xiangdong Liu Zhen Chen Yongjiang Xia School of Automation Beijing Institute of Technology 100081 China Shanghai Key Laboratory of Science and Technology on Space Intelligent Control 200233 China

In this paper, the problem of spacecraft attitude tracking maneuvers in the presence of parametric uncertainty and external disturbance is addressed. A time-varying sliding mode controller with an exponential time-varying sliding surface is presented. The attitude of spacecraft is represented by modified Rodrigues parameters for the non-redundancy. The proposed control algorithm eliminates the reaching phase of conventional time-invariant sliding mode control and guarantees the sliding mode occurrence all the time. This property indicates that the controller is global robust against matched parametric uncertainty and external disturbance. Additionally, the control parameter is adjusted to minimize a given quadratic cost. Finally, a numerical simulation is employed to verify the proposed control algorithm.

关键词： Torque Robustness

来源：评论

学校读者我要写书评

暂无评论

Automatic Detection of the Intima-Media Layer in Ultrasound Common Carotid Artery Image Based on Active Contour Model

Automatic Detection of the Intima-Media Layer in Ultrasound ...

引用

International Conference on Intelligent Computation and Bio-Medical Instrumentation (ICBMI)

作者： Jiaoying Jin Mingyue Ding Xin Yang Image Processing and Intelligence Control Key Laboratory of Education Ministry of China Life School of Science and Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory for Multi-spectral Information Processing Technologies Institute for Pattern Recognition and Artificial Intelligence(IPRAI) Life School of Science and Technology Huazhong University of Science and Technology Wuhan China

The analysis of the carotid artery wall is of paramount importance in clinical practice. Especially, the intima-media thickness is a risk index for some of the most severe acute cerebrovascular pathologies, hence, an accurate segmentation of the different layers of the carotid artery is needed. IMT is usually manually measured on longitudinal B-mode ultrasound images. In the past ten years, many computer-based techniques for intima-media thickness measurement have been proposed to overcome the limits of manual segmentation, but almost all of them require a certain degree of user interaction. In this paper we proposed a novel approach for the completely user-independent segmentation of the common carotid artery wall. Our algorithm is designed for the extraction of the intima and media layers of the distal carotid wall in ultrasound images. It is based on integrated approach consisting of common carotid artery region identification, contour initialization with threshold segmentation, intima-lumen segmentation with Snake, and media-adventitia segmentation with GVF-Snake that enables the automated tracing of the carotid walls. The acoustic impedance's difference is employed to locate common carotid artery region. Finally, the characterization of the algorithm in terms of segmentation error was evaluated with a set of 40 common carotid artery ultrasound images and compared to the segmentation traced by a trained operator. Experiments showed that a mean error lower than 1.3 pixel both on the intima and media layers was obtained, which is comparable to that obtained by means of operator dependent techniques.

关键词： Image segmentation Carotid arteries Ultrasonic imaging Media Algorithm design and analysis Ultrasonic variables measurement

来源：评论

学校读者我要写书评

暂无评论

Coordinated control strategy of pressure difference and height of stratospheric airships

引用

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (science and technology) 2011年第SUPPL. 1期42卷 327-332页

作者： Wu, Lei Li, Yong Li, Zhi-Bin Beijing Institute of Control Engineering Beijing 100190 China Science and Technology Space Intelligence Control Laboratory Beijing 100190 China China Academy of Space Technology Beijing 100094 China

The main factors which affect differential pressure of stratospheric airships are analyzed;a differential pressure control system model of ascending process is established and various factors on the differential impact are analyzed by means of simulation. Secondly, a kind of coordinated control strategy which relies mainly on differential pressure control while altitude control subsidiary is presented. And the controllers based on the strategy are designed. The coordinated control of the pressure difference and altitude is developed, and the performance of the controllers is analyzed by simulation.

关键词： Altitude control

来源：评论

学校读者我要写书评

暂无评论

Ultrasound Carotid Artery Intima-Media Thickness (IMT) Segmentation Review

Ultrasound Carotid Artery Intima-Media Thickness (IMT) Segme...

引用

International Conference on Intelligent Computation and Bio-Medical Instrumentation (ICBMI)

作者： Xin Yang Jiaoying Jin Ming Yuchi Mingyue Ding State Key Laboratory for Multi-spectral Information Processing Technologies Institute for Pattern Recognition and Artificial Intelligence (IPRAI) Huazhong University of Science and Technology HUST Wuhan Hubei China Image Processing and Intelligence Control Key Laboratory of Education Ministry of China School of Life Science and Technology Huazhong University of Science and Technology HUST Wuhan Hubei China

Stroke and heart attack, which could be led by a kind of cerebrovascular and cardiovascular disease named asatherosclerosis, would seriously cause human morbidity and mortality. And the carotid artery of intima-media thickness (IMT) is a key indicator to the disease. With the development of computer assisted diagnosis (CAD) technology, Ultrasound imaging, being real-time, economic, reliable, safe, and now seems to become a standard in vascular assessment methodology especially for the measurement of IMT. This review is an attempt to discuss the clinical relevance of measurements in clinical practice at first, and then followed by the challenges that one has to face when approaching the segmentation of ultrasound images. Secondly, the paper is presentation of common used methods for the IMT segmentation and measurement. An overview of summary and future perspectives is given in conclusion finally.

关键词： Ultrasonic imaging Image segmentation Carotid arteries Ultrasonic variables measurement Biomedical imaging

来源：评论

学校读者我要写书评

暂无评论

A Uniform Solution to Common Algorithmic Problem by Tissue P Systems with Cell Division

A Uniform Solution to Common Algorithmic Problem by Tissue P...

引用

International Conference on Bio-Inspired Computing: Theories and Applications, BICTA

作者： Yunyun Niu Linqiang Pan Mario J. Perez-Jimenez Key Laboratory on Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan Hubei China Research Group on Natural Computing Department of Computer Science and Artificial Intelligence University of Sevilla Sevilla Spain

Common algorithmic problem is an optimization problem, which has the nice property that several other NP-complete problems can be reduced to it in linear time. A tissue P system with cell division is a computing model which has two basic characters: intercellular communication and the ability of cell division. The ability of cell division allows us to obtain an exponential amount of cells in linear time and to design cellular solutions to computationally hard problems in polynomial time. We here present an effective solution to the common algorithmic decision problem using a family of recognizer tissue P systems with cell division.

关键词： Manganese Polynomials Biomembranes Computer science Bismuth Radiation detectors Educational institutions

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：