In this paper, an adaptive decentralized controller is presented to attenuate the transversal vibration of a flexible cablestayed bridge induced by seismic excitation, in which only local sensor information has been u...
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The LMS algorithm forms the core of a number of adaptive control schemes. It has on one hand provided certain degree of robustness to these algorithms but on the other hand its convergence rate is notoriously slow. We...
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The LMS algorithm forms the core of a number of adaptive control schemes. It has on one hand provided certain degree of robustness to these algorithms but on the other hand its convergence rate is notoriously slow. We propose a method to initialize the LMS algorithm which dramatically shortens its adaptation period. We also prove that under certain condition this initialization can be computed without explicit knowledge of either the reference or noise spectrum. Although the work is illustrated using the filtered-X scheme, this idea can also be applied to other similar schemes. Two successful experiments starting from black-box identification to real-time control have verified the effectiveness of this idea.
The retina is an intelligent vision sensor indispensable in real-time image information processing of animals. The parallel image processing function of the retina was realized in an analog CMOS integrated circuit (vi...
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This paper deals with an adaptive resolved motion rate control (RMRC) method for a cooperative manipulation of a floating object by two free-based space robots with manipulators. Discussions as for the adaptive estima...
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This paper deals with an adaptive resolved motion rate control (RMRC) method for a cooperative manipulation of a floating object by two free-based space robots with manipulators. Discussions as for the adaptive estimation are done on the divided generalized Jacobi matrices, which can be derived by system partition of the whole robot system. The method proposed here has an advantage that control algorithm of each robot is same even if a number of robots increases. The validity of the method was successfully confirmed by computer simulation.
We numerically study the time evolution of coherent vortices in decaying turbulence described by the Charney-Hasegawa-Mima equation with the weak dissipation. Self-organized coherent vortices develop through the mutua...
We numerically study the time evolution of coherent vortices in decaying turbulence described by the Charney-Hasegawa-Mima equation with the weak dissipation. Self-organized coherent vortices develop through the mutual advection and the vortex merging. The dimensional analysis provides the dynamical scaling law of structure function of the potential vorticity field S(k,t)=E5/4λ1/2t1/2G(k/k¯(t)) [k¯(t)∼E−1/8λ3/4t−1/4] with a scaling function G(x), which turns out to be in good agreement with numerical experiments. In physical space, quantities related to coherent vortices develop algebraically with time. The dimensional analysis predicts that the total number N of vortices decreases as N∼t−χ with exponent χ=1/2. Moreover, it is found that the remarkable feature of this system is the approximate conservation of the area of the coherent region in the potential vorticity field.
Static task scheduling in distributed computing systems is a very complex problem and known to be NP-hard. This problem is even harder when the module execution times become probabilistic. In this paper we study the e...
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Static task scheduling in distributed computing systems is a very complex problem and known to be NP-hard. This problem is even harder when the module execution times become probabilistic. In this paper we study the effect of probabilistic module execution times on the performance of task-scheduling algorithms. We show that in static task scheduling, for probabilistic module execution times, and in the existence of some factors there is no need to use an expensive task-scheduling algorithm. Given any two static task-scheduling algorithms that use deterministic module execution times in assigning task modules to the distributed system, the performance of these two algorithms will not remain the same when these module execution times become probabilistic rather than deterministic. We also study the effects of some factors an our results.
The foundation of computer vision system for testing, controlling and adjusting of the TV sets is a mathematical model of distortion of the TV picture. Adequate accurate model description parameters are given by polyn...
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The foundation of computer vision system for testing, controlling and adjusting of the TV sets is a mathematical model of distortion of the TV picture. Adequate accurate model description parameters are given by polynomial of order eight and knowledge based nonlinear, cross coupled relationships between command variables for adjusting of the TV sets and coefficients of polynomial.
A method of time switching for time-division communication systems is introduced, A compact shift register-based circuit is used for this purpose in order to achieve high-speed switching.
A method of time switching for time-division communication systems is introduced, A compact shift register-based circuit is used for this purpose in order to achieve high-speed switching.
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