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Kozo Ohtani,Mitsuru Baba 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper describes a method of identifying the surface roughness and three-dimensional shape of a metal part with alaser range finder. Our range finder is equipped with an optical position sensor that can simultaneously detect the position of alight and its incident angle with respec to the sensor. Moreover, the sensor has an autonomous expo sure time control function with a microcomputer. Therefore, the laser range finder can detect the three-dimensional(3-D) shape of an object with unknown reflectance. We constructed aprototype system and performed experiments with measured objects made of ther mally sprayed materials. First, we in spected the surface reflection of each elementin the ther mally sprayed materials and established the measurement procedure using our range finer, which can identify surface roughness based on the optical properties of a surface. Next, we measured the thermally sprayed materials with several kinds of delaminations. From the measurement results, we found the error of the 3-D shape measurement to be Δz/z=0.7%, which was independent of the surface reflection of the measured objects. Regarding the detection of the surface roughness, we could identify four types of delamination conditions with accuracy. The proposed method has great potential for use in a wide range of industrial inspections.
Visualization for Fluid Dynamics Education
Kozo Fujii 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.4
Effect of visualization as a tool for the education of fluid dynamics is mainly discussed. Visualized images are much more understandable compared to the explanation using equations and texts. Several-examples are presented to clarify this statement. Then, the software system for teaching fluid dynamics using the results by the numerical simulation is discussed. Two important issues on what is needed in the system are given. First, such systems should be capable of animating images. Second, such systems should be interactively used by students. Changing parameters, coefficients, equations, etc. themselves and watching the difference are important for them to understand the nature of physics underlying the equations. The teaching system with visualization is no doubt a good tool for introducing fluid dynamics.
( Kozo Harimaya ),( Koichi Kagitani ),( Hirofumi Tominaga ) 세종대학교 경제통합연구소 (구 세종대학교 국제경제연구소) 2008 Journal of Economic Integration Vol.23 No.4
This paper investigates the effect of political factors on safeguards. We present a simple model to show the relationship between political factors and safeguards, and empirically examine whether the Japanese safeguard system was influenced by the political factors. Our empirical analysis shows that the Japanese safeguard system for agricultural products is not neutral to the WTO Agreement on Safeguards and it is distorted due to political reasons.