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LETTER TO THE EDITOR : High Levels of Anti-Heat Shock Protein 27 Antibody in Pemphigus Vulgaris
Mohammad Javad Yazdanpanah,Ali Reza Taji,Zari Javidi,Fakhrozaman Pezeshkpoor,Amir Ali Rahsepar,Shima Tavallaie,Akram Momenzadeh,Saber Shojaie Noori,Mohsen Khoddami,Sara Rahsepar,Majid Ghayour M 대한피부과학회 2013 Annals of Dermatology Vol.25 No.2
Nonlinear Sliding Surfaces; Computing and Existence of Solution
Azad Ghaffari,Mohammad Javad Yazdanpanah 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, we have concentrated on real systems consisting of structural uncertainties and affected by external disturbances. In this regard, Sliding Mode Control (S.M.C.) is utilized. To decrease energy consumption, arising from chattering phenomenon, a smooth switch has been used in design procedure. Consequently, sliding equation will play a dominant controlling role in its neighborhood. The converging property of sliding motion towards the origin is a challenging issue. In this article we present a new method to prove the stability of the sliding phase which means, state trajectories on the sliding surface move toward the origin. At the beginning, the equivalent control method is reestablished such that makes this purpose accessible. The modification bounds the sliding equation to a converging set. Then to improve main factors of closed loop system, such as, transient behavior, energy consumption and the domain of attraction, the optimal control theory is used to compute the optimized sliding surface in the stabilizing set. Generally, desired surface has nonlinear terms. Finally, we propose an elaborate algorithm for computing optimized nonlinear surfaces. The designed controller is applied to a flexible?ink setup. Simulation results show the efficiency of the proposed approach.
Passivity-Based Structured Model Predictive Control with Guaranteed Stability
Ghazal Montaseri,Mohammad Javad Yazdanpanah,Ali Khaki-Sedigh 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, a model predictive control scheme for a class of nonlinear systems is presented. In the proposed algorithm, the new cost function for MPC is defined. This cost function is inspired by the structure of passivity-based control. By simple tuning of weighting matrices, the asymptotic stability is guaranteed. Moreover, a closed-form solution to the optimal control problem is calculated via representing the nonlinear system in the state-dependent coefficient form of the state-space model. This point is of great importance in online applications. To demonstrate its efficiency, the passivity-based structured MPC is applied to control a rotational motion of a rigid body.
Switching Control of State-Dependent Switched Systems under Consistent Perturbation
Fatemeh Tahersima,Soroush Afkhami,Mohammad-Javad Yazdanpanah 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, the optimal control problem of nonlinear perturbed switched systems is studied in an infinite-time horizon. The main feature of the concerned systems is the considerable amount of input disturbance which is not known a priori and is measured online. Therefore the sequence of active sub-systems is not previously specified and the number of switchings tends to infinity. The optimal solution presented here is based upon the equal distribution of switching instants that is the main idea of this paper. As a result, it is not needed to consider any constraints on the number of switchings and the switching sequence. While prespecified bandwidth of the disturbance allows this assumption, the disturbance will also be estimated between the switching instants. Then it can be used in a feed-forward manner to choose among allowable subsystems to activate. This is done in a way that an integral cost functional is minimized between every two successive switching instants.