Hiroyuki Suda

Learn More
A wideband 16/spl times/32 MIMO channel sounder has been developed for the 5.8 GHz band. The paper reports on a series of measurements with the purpose of investigating both temporal and spatial aspects of channel changes in a number of widely different indoor environments. The measurements are carried out using two planar arrays of monopoles. The results(More)
To use biped walking as a locomotion method, many researchers have studied biped robots achieving high-performance walking. Many latest biped robots have arc-shaped feet to achieve more high-performance walking. However, the biped robots have many problems due to the arc-shaped feet. To overcome these problems, flat feet with elasticity and viscosity at(More)
Many biped robots that achieve high-efficient walking have been proposed in the recent years. Many researchers have thus developed biped robots that achieve active walking based on passive dynamic walking (PDW). Although these biped robots achieve energy-efficient active walking, their walking speed is generally slow. We have proposed a flat-footed PDW(More)
Hydrogen permeability of metal membranes is generally defined by the square-root law, as the proportional coefficient of permeation flux to the square-root difference of the pressures on both sides of the membrane. However, deviation from the law has been widely reported for palladium, niobium, etc. Although n-th power instead of the square root has often(More)
A wideband 16×32 multiple-input multiple-output (MIMO) channel sounder has been developed for the 5.8 GHz band. This paper reports on a series of measurements with the purpose of investigating both temporal and spatial aspects of channel changes in a number of widely different indoor environments. The measurements are carried out using two planar arrays of(More)
Although the Policy Iteration is one of effective algorithms to solve an optimal control problem for nonlinear systems, it is not clear whether this algorithm can be applied for hybrid systems or not. In this paper, properties of a conventional policy iteration for nonlinear hybrid systems is analyzed and it is shown that the policy iteration can be applied(More)
A quick method involving the control of heat and water vapor pressure for preparing moisture-saturated carbon fiber-reinforced plastics (CFRP, 8 unidirectional prepreg layers, 1.5 mm thickness, epoxy resin) has been developed. The moisture-saturated CFRP sample was obtained at 120 ̋C and 0.2 MPa water vapor in 72 h by this method using a sterilizer(More)
A novel combined organic and inorganic process for preparing thin supported membrane was developed, using which a thin and defect-free Pd membrane with uniform thickness of 5 microm was directly coated onto porous alpha-Al2O3 hollow fiber without any interlayer and substrate penetration; at the same time, there existed a small interstice between membrane(More)