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1. Delay-dependent stabilization of Singular Linear Time Delay Systems Based on Memory State Feedback Control | |||
jiang zhaohui,Gui Weihua ,Xie Yongfang | |||
Information Science and System Science 26 February 2008 | |||
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Abstract:In this paper, the delay-dependent stabilization problem for singular linear time-delay systems is studied by designing a delay-dependent memory state feedback controller which makes the singular linear time-delay systems regular, impulse free and asymptotically stable. Firstly, the lemma of descriptor integral-inequality is derived. Secondly, delay dependent stabilization conditions are established by using the Lyapunov-Krasovskii functional approach combined with an descriptor integral-inequality. Thirdly, an LMI based algorithm to design a memory state feedback control that stabilizes the system is provided. Finally, a numerical example is presented to illustrate the effectiveness and the availability for the design. | |||
TO cite this article:jiang zhaohui,Gui Weihua ,Xie Yongfang . Delay-dependent stabilization of Singular Linear Time Delay Systems Based on Memory State Feedback Control[OL].[26 February 2008] http://en.paper.edu.cn/en_releasepaper/content/18835 |
2. SDG-Based Fault Isolation for Large-Scale Complex Systems Solved by Rough Set Theory | |||
Fan Yang,Xiao Deyun | |||
Information Science and System Science 09 January 2008 | |||
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Abstract:Signed directed graph (SDG) is an important qualitative model that is used to describe large-scale complex systems and the cause-effect relationships among variables. It has been successfully applied in fault diagnosis, hazard assessment and other areas. In the fault isolation problem, the task is to find the fault origin that causes the abnormal phenomenon. However, as the basis of analysis, the inference method based on SDG, is simply a traversal search or a rule-based expert system. Because of the redundant or disordered information, the efficiency of these algorithms is quite low. Rough set theory provides an idea of handling vague information and can be used to data reduction, thus it can be introduced to the fault isolation problem (a kind of decision problems) to optimize the decision rules. The decision algorithm is proposed in this paper, in which the generation and reduction methods of the rules are related to the structure of the SDG model. We combine the algebraic and logical expression ways to achieve the purpose. Moreover, due to the convenience of expressing granularity, the decision algorithm is still applicable when the types of the faults we concerned are changed or reformed. Finally, an example of a 65t/h boiler system is carried out to illustrate and validate the proposed method, and some future trends of this method are also discussed. | |||
TO cite this article:Fan Yang,Xiao Deyun. SDG-Based Fault Isolation for Large-Scale Complex Systems Solved by Rough Set Theory[J]. |
3. Stability Analysis for Hybrid Dissipative Hamiltonian Systems with Infinite Number of Switching Subsystems | |||
Wang Yuzhen,Zhu Liying | |||
Information Science and System Science 28 December 2007 | |||
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Abstract:This paper investigates the stability of nonlinear Hybrid Dissipative Hamiltonian (HDH) systems with infinite number of switching subsystems, and presents a number of results on the stability analysis for two types of the HDH systems under arbitrary/restricted switching laws. Under a realistic assumption, it is shown that the hybrid systems are stable under arbitrary switching laws. Based on the dissipative Hamiltonian structural properties and the zero-state detectibility of the subsystems, the asymptotical stability under arbitrary/restricted switching laws is then investigated, and several interesting results on the asymptotical stability are proposed for the two types of systems, respectively. Finally, via Hamiltonian realization, the results obtained for the hybrid Hamiltonian systems are applied to more general nonlinear hybrid systems with infinite number of switching subsystems, and several stability results are also presented in this paper. Study on examples with numerical simulations shows that the results obtained in this paper are very practicable in analyzing the stability of hybrid systems with infinite number of switching subsystems. | |||
TO cite this article:Wang Yuzhen,Zhu Liying. Stability Analysis for Hybrid Dissipative Hamiltonian Systems with Infinite Number of Switching Subsystems[OL].[28 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17499 |
4. On the Modeling and Stability Analysis of Switched Two-Machine Power Systems | |||
Zhu Liying,Wang Yuzhen | |||
Information Science and System Science 28 December 2007 | |||
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Abstract:It is very important for power systems to execute emergency control when large disturbances occur in the systems. Based on the principles of switching control, a new switching model is first built for a two-machine power system in this paper. Then, the new model, called switched two-machine power system, is expressed as the form of a switched dissipative Hamiltonian system, and the stability analysis is carried out for the system. Simulations on a two-machine power system show that the new results obtained in this paper are very practicable. | |||
TO cite this article:Zhu Liying,Wang Yuzhen. On the Modeling and Stability Analysis of Switched Two-Machine Power Systems[OL].[28 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17494 |
5. Opportunity-Awaiting Control for Discrete-Time Systems: Rectangular Target Area Case | |||
Guo Zhi,Wang Jun,Wang Yuangang | |||
Information Science and System Science 17 December 2007 | |||
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Abstract:In this paper, a new control problem, namely, opportunity-awaiting control problem is proposed and investigated thoroughly for a class of discrete stochastic systems. The main purpose of the opportunity-awaiting control problem is to design a controller, for a system subjected to external stochastic disturbances, such that the following two requirements meet specified admissible values simultaneously: 1) the controlled output resides within a given rectangular target area  for time Tin(residence time); and 2) the controlled output waits outside the area  for time Tout(waiting time). Statistical characteristics for admissible residence time and waiting time are derived with respect to a given rectangular target area, and the relationship between residence time and waiting time is discussed. It is shown that both the residence time and waiting time are determined by the steady-state output variance and the correlation coefficient of the system output. Based on the linear matrix inequality approach, a controller design method is then developed so that the prescribed performance constraints on the residence time, waiting time and poles’ location are satisfied. An illustrative numerical example is included to demonstrate the effectiveness of the developed design method. | |||
TO cite this article:Guo Zhi,Wang Jun,Wang Yuangang. Opportunity-Awaiting Control for Discrete-Time Systems: Rectangular Target Area Case [OL].[17 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17055 |
6. Opportunity-awaiting control for discrete-time systems | |||
Guo Zhi,Wang Jun,Wang Yuangang | |||
Information Science and System Science 17 December 2007 | |||
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Abstract:Opportunity-Awaiting control (OAC) is a type of stochastic control which constraints the control output within a spatial area, instead of a single point. In this paper, for a class of discrete-time system, OAC with constraint of interval target area under stable stochastic serials with normal distribution is discussed. Formulas of average residence time and average waiting time are derived and the consistency between them is analyzed. The residence time and waiting time are determined by the steady-state output variance and the correlation coefficient of the output. The corresponding control strategy is illustrated based on LMI method. | |||
TO cite this article:Guo Zhi,Wang Jun,Wang Yuangang. Opportunity-awaiting control for discrete-time systems[OL].[17 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17033 |
7. A Novel Encoding Architecture of QC-LDPC Codes Based on RAMs | |||
Zhang Wenjun ,Chen Liming | |||
Information Science and System Science 06 December 2007 | |||
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Abstract:In this paper, a method to mend the encoding architecture based on RAMS is presented for systematic-circulant (SC) form QC-LDPC codes. In this advanced architecture of QC-LDPC Codes Encoder, the RAMs are advisably used to store the parity-check bits and the pointers are introduced as the addresses of the RAMs instead of shift registers used for storing the generator of . Thus, the encoding process can be achieved by reading and writing on RAMs and the parity-check bits can be output serially. Because the encoding architecture doesn’t need any shift registers and parallel to serial circuit, hardware resource is saved and the data throughput is increased. | |||
TO cite this article:Zhang Wenjun ,Chen Liming . A Novel Encoding Architecture of QC-LDPC Codes Based on RAMs[OL].[ 6 December 2007] http://en.paper.edu.cn/en_releasepaper/content/16757 |
8. Design and Realization of Electronic Seal Administration System Based on Three-tier Architecture | |||
ding jie,Jie Guoli | |||
Information Science and System Science 19 October 2007 | |||
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Abstract:Design of three-tier structure is a new trend in network applications. This paper presents the framework of three-tier structure design and associates example to discuss particularly system structure and function module’s design. In the design, the advantage of the UML in MIS is demonstrated by using of UML modeling and an oil depot MIS example. | |||
TO cite this article:ding jie,Jie Guoli. Design and Realization of Electronic Seal Administration System Based on Three-tier Architecture[OL].[19 October 2007] http://en.paper.edu.cn/en_releasepaper/content/15782 |
9. Influence factor of flexibility and research on relationship between performance and flexibility | |||
Qi Peng-ju | |||
Information Science and System Science 04 July 2007 | |||
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Abstract:Based on the earlier theories, this paper proposed several assumptions, Methods such as questionnaire investigation, Exploratory Factor Analysis, Structure Equation Model(SEM), Moderate Multiple Regression analysis (MMR) were applied in the paper to discuss the influence factor, relationship between performance and flexibility, whether environmental turbulence has a moderating effect on the relationship also has been discussed. | |||
TO cite this article:Qi Peng-ju. Influence factor of flexibility and research on relationship between performance and flexibility[OL].[ 4 July 2007] http://en.paper.edu.cn/en_releasepaper/content/13839 |
10. Research on 3D Modeling for Head MRI Image Based on Immune Sphere-Shaped Support Vector Machine | |||
Lei Guo,Youxi Wu,Lei Wang,Weili Yan | |||
Information Science and System Science 24 May 2007 | |||
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Abstract:In head MRI image sequences, the boundary of each encephalic tissue is highly complicated and irregular. It is a real challenge to traditional 3D modeling algorithms. Support Vector Machine (SVM) based on statistical learning theory has solid theoretical foundation. Sphere-Shaped SVM (SSSVM) was originally developed for solving some special classification problems. In this paper, it is extended to image 3D modeling which tries to find the smallest hypersphere enclosing target data in high dimensional space by kernel function. However, selecting parameter is a complicated problem which directly affects modeling accuracy. Immune Algorithm (IA), mainly applied to optimization, is used to search optimal parameter for SSSVM. So, Immune SSSVM (ISSSVM) is proposed to construct the 3D models for encephalic tissues. As our experiment demonstrates, the models are constructed and reach satisfactory modeling accuracies. Theory and experiment indicate ISSSVM exhibits its great potential in image 3D modeling. | |||
TO cite this article:Lei Guo,Youxi Wu,Lei Wang, et al. Research on 3D Modeling for Head MRI Image Based on Immune Sphere-Shaped Support Vector Machine[OL].[24 May 2007] http://en.paper.edu.cn/en_releasepaper/content/13012 |
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