Yasushi Kami

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This paper is concerned with the mixed H2/H∞ control problem via static output feedback control. The main purpose of this paper is to give an iterative method for finding a sub-optimal static output-feedback controller for the mixed H2/H∞ control problem. The contribution of this paper is to derive a gradient of the H2 cost function. Using this gradient, we(More)
The crosstalk between single-ended and differential lines is investigated in this paper. First, the telegraphers equations for multiconductor line are applied. Then the differential pair is terminated respectively with T and Π termination networks, and the crosstalk from the single-ended trace to the differential pair is evaluated at the grounded resistors(More)
Social communication created on the Internet has realized a communication form mankind never experienced in which thousands or millions of people share each other images and sounds. In this report, we present the results of virtual tug-of-war experiments using multilateral telecontrol in which clients in eight sites throughout Japan share the force sense.
This paper is concerned with the mixed H2/H∞ control problem. The purpose of this paper is to give an iterative algorithm for finding a sub-optimal static state feedback controller for the mixed H2/H∞ control problem. The key idea of our algorithm is to construct two “controller sets”: one is a set of controllers that improve the H2 norm of the closed loop(More)
Robust control problems for nonlinear systems are usually formulated as L<inf>2</inf>-induced norm minimization problems and it is known that those problems are reduced to the solvability of Hamilton-Jacobi equations. However, in the case of bilinear systems the usual L<inf>2</inf>-induced norm minimization problem leads to an obvious solution (the zero(More)
This paper aims to design a robust H∞ control system against time invariant polytopic uncertainties. In general, such robust control problems are described by parameter dependent bilinear matrix inequality (PDBMI) problems which are not tractable numerically and there are few efficient methods for solving them. In this paper, we propose an iterative(More)
This paper deals with the mixed H<inf>&#x221E;</inf>/D-stability control problem with a fixed-order output feedback controller. It is well known that this control problem is described as a combined bilinear matrix inequality (BMI) problem whose feasible solution is difficult to be found. In this paper, we propose a new exterior-point approach for finding a(More)