Principles of the propulsion mechanismThe present study develops a new propulsion mechanism based on the inertial force. This mechanism is based on a pulsating lateral inertial force arising from by a shaking mass, and through the difference between the friction coefficient equivalent according to the direction on the ground surface. On this report the promotion mechanism was simulated to study relation between the shaking mass and the direction of ground elements. This result of simulation is compared with result of locomotion tests using the advanced prototype robot. More efficient settings of the propulsion mechanism are given to use.The locomotion mechanism developed in the present study is actualized by two principal actions, a shaking of a mass lateral to the direction of locomotion and a change in the own motion direction of the ground element.The acceleration of the weight, bx and by, is given by b w t s wx w bx
An accurate design of the thermal resistance of vertical cavity surface emitting lasers (VCSELs) is important for high efficiency and high output power density of a VCSEL array. Although there are reports on the thermal conductivity of a thin layer that changes from that of bulk material due to phonon scattering, its influence on VCSELs has not been clarified. In this study, we analyzed the thermal resistance of VCSELs by numerical simulation considering the thermal conductivity reduction effect of thin layer and compared it with that of experimentally fabricated devices. The device thermal resistance determined from both experimental measurements and analyzed results were 1.3-2.0 times larger than the calculated one with assuming the conventional bulk properties. The results clarified that the effect is significant and cannot be ignored when preparing an accurate device design.
The INSPECT (Integrated Numerical research System for Prevention and Estimation of Coastal disasTer) system was developed for numerical analysis of oceanographical disaster phenomena in coastal and estuarine areas. The INSPECT consists of three numerical simulation models (Wave, Storm Surge and Tsunami models), their supporting sub-systems and supporting databases. With this system, various coastal protection works can be more reliable designed. The paper presents an outline of the design, basic theory of numerical research and applications of the system. The analysis of tide, Wave, Tsunami and storm surge on the coasts of Shikoku Island in Japan is performed by using INSPECT.
The moored ship motion induced by the long-period waves causes troubles in the cargo handling before the completion of the breakwater at Misato district in Kochi port. The Takamatsu Research and Engineering office for Port and Airport has developed "Long-period wave forecasting system of Kochi port" to predict the long-period waves, which affect the cargo handling. To promote the accuracy of the prediction the system introduces the disaster prevention information of the Japan Meteorological Agency and accepts the opinion of cargo handling traders. A result of the test run could confirm the validity of the system in the long-period wave forecast.
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