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Abstract—Recently, nonlinear H∞ control theory has been paid attention. The solvable condition of nonlinear H∞ control problem is given by the Hamilton Jacobi Inequality (HJI). StateDependent Riccati Inequality (SDRI) is one of approaches to solve the HJI. The SDRI contains State-Dependent Coefficient (SDC) form of a nonlinear system. The SDC form is not… (More)

- Y Sakayanagi
- Applied optics
- 1973

To get high accuracy for measuring length, an interferometric measurement is usually used. In this case advancement of the mirror usually accompanies the rotational movement of the mirror, and this affects the proportionality between the advancement of the mirror and fringe displacement. If the rotational movement is small the deviation from proportionality… (More)

Abstract: Recently, nonlinear H∞ control theory has been paid attention for the powerful design method for a robust stabilization. The solvable condition of nonlinear H∞ control problem is given by the Hamilton Jacobi Inequality (HJI). The HJI is the partial differential inequality which is quite difficult to solve, so some numerical approaches have been… (More)

- Y Sakayanagi, S Aoki
- Applied optics
- 1978

The fabrication of small toroidal mirrors in tandem for x-ray imaging is discussed. First, a male mandrel is made by grinding and polishing a molybdenum rod. Then. a glass replica is cast and lightly polished. The method of polishing the male mandrel is described. A photograph of a copper mesh taken with a 8.3-A x ray is shown.

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