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Redundancy of the Giant Swing Backward Movement on the High Bar
Yoshinori Kanemoto,Taiga Yamasaki,Xin Xin,Kiyoshi Gotoh 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Extent of redundancy in human movements under nonholonomic constraints can be an important factor to detemince a resulting movement. However, the redundancy has seldom been examined concretely in previous studies concerning optimality of human movements under such constraints. This study focuses on a gymnastic movement on the high bar, called "giant swing backward", as and almost periodic task under a second order nonholonomic constraint, and reveals a part of redundancy of the task by extending our prvious study. To this end, a simple dynamical model of an expert gymnast performing the giant swing back ward is constructed with parameterization of time histories of actuated joint angles by Fourier serires, and is confirmed to approximately reproduce a measured movement of the gymnast. The redundancy is calculated in various parameter spaces composed of lower order fourier coefficients. The results illustrate restricted but considerable redundancy underlying the giant swing backward. Moreover, within the set of the redundant movements, four kinds of optimization citeria are examined to explain the movement performed by the gymnast.
Stabilizing Control of TCP/AQM Networks with Time Delay in State Variables
Seiji Tanaka,Xin Xin,Taiga Yamasaki 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper studies how to design a congestion controller in TCP/AQM networks. In Hollotetal. (IEEE Trans. on Automatic Control, Vol.47, No.6,2002), the congestion controller is conservatively designed due to using the linearized model of the TCP/AQM networks in which a structured time-delay related term is treated as an unstructured uncertainty. Without treating anytime-delay related term as uncertainty, we provide a necessary and sufficient a condition of existence of PI stabilizing controller for the system, and we propose a new design of the congestion controller via solving a stabilization problem of the system with a time delay in the variables of both statand input. The simulation results are provided to validate the proposed design method.