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Pose Normalization for CAD Meshes
Takashi Michikawa,Hiromasa Suzuki,Eiji Ohta,Yuichi Sato,Masayoshi Hashima (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
CAD meshes are used in assembly models for digital mock-up (DMU) applications. They are defined as polygonal meshes, and their pose information is usually lost when they are brought together in a model. Accordingly, this paper presents a simple method of finding good poses for CAD meshes. Since extrusion features can be seen in most such meshes, our method estimates their axes from polygonal meshes. For each triangle in a CAD mesh, voting is applied for the estimated extruding axis, and the local coordinate system of the mesh is determined from the voting result. This approach facilitates the capture of good poses for CAD meshes, whereas PCA-based methods create misalignment in most cases. This paper also demonstrates that our method is efficient for a number of applications in CAD and voxel-based mesh generation.
Yuki Tokuda,Daichi Tsubokura,Eiji Ohmichi,Hitoshi Ohta 한국자기학회 2013 Journal of Magnetics Vol.18 No.2
Cantilever-detected high-frequency electron spin resonance (ESR) is a powerful method of sub-terahertz and terahertz ESR spectroscopy for a tiny magnetic sample at low temperature. In this technique, a small magnetization change associated with ESR transition is detected as deflection of a sample-mounted cantilever. So far, we have succeeded in ESR detection at 370 GHz using a commercial piezoresistive microcantilever. The spin sensitivity was estimated to ~10<SUP>12</SUP> spins/gauss. In order to further increase the sensitivity, we adopt a fiber-opticbased detection system using a Fabry-Perot interferometer in place of piezoresistive system. Fabry-Perot cavity is formed between an optical-fiber end and microcantilever surface, and a change in the interference signal, corresponding to the cantilever deflection, is sensitively detected. This system is suitable for low-temperature and high-magnetic-field experiments because of its compact setup and less heat dissipation. In this study, performance of Fabry-Perot interferometer is evaluated, and its application to cantilever-detected ESR measurement is described.