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RISS 인기검색어
- 검색키워드
- 저자 : Takashi Michikawa (검색결과 5 건)
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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.
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Mesh generation of porous metals from X-ray computed tomography volume data
Zhenyu Niu,Hiromasa Suzuki,Yutaka Ohtake,Takashi Michikawa 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
Recently, to meet the requirement of machine industry, there has been an increased focus on the development of porous metal as ahigh-strength material despite its low density. To evaluate its properties and quality, material testing is usually conducted. However, it ismore efficient to perform computer simulation evaluations using finite element analysis. The X-ray computed-tomography scanningtechnique enables us to obtain the information regarding the internal structure of the metal. Furthermore, a reconstruction algorithm producesvolume data of the test object. In general, conventional methods are utilized to generate mesh data from volume data for finiteelement analysis, but a key drawback is that they generate too many elements, resulting in high computational cost. We propose an approachto generate meshes for porous structures by modeling each pore using spheres from volume data.
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Mesh Generation of Porous Metals from X-ray Computed Tomography Volume Data
Zhenyu Niu,Hiromasa Suzuki,Yutaka Ohtake,Takashi Michikawa (사)한국CDE학회 2013 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Recently, to meet the requirement of machine industry, there has been an increased focus on the development of porous metal as a high-strength material despite its low density. To evaluate its properties and quality, material testing is usually conducted. However, it is more efficient to perform computer simulation evaluations using finite element analysis. In fact, converting a large piece of porous metal into digitized mesh data is significantly difficult because of its complex inner structure. The X-ray computed tomography scanning technique enables us to obtain the information regarding the internal structure of the metal. Furthermore, a reconstruction algorithm produces volume data of the test object. In general, conventional methods are utilized to generate mesh data from volume data, but a key drawback is that they generate too many elements, resulting in high computational cost. We propose an approach to generate meshes for porous structures by modeling each pore using spheres from volume data. Data conversion is conducted through a series of processes namely labeling, spherical approximation, shape approximation, region segmentation, and meshing. The result verifies the feasibility of the proposed method, which generates shape-approximated and finite-element-simulation-available mesh data using fewer elements.
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Metabolic Syndrome is a Predisposing Factor for Diffuse Idiopathic Skeletal Hyperostosis
Eijiro Okada,Shinichi Ishihara,Koichiro Azuma,Takehiro Michikawa,Satoshi Suzuki,Osahiko Tsuji,Satoshi Nori,Narihito Nagoshi,Mitsuru Yagi,Michiyo Takayama,Takashi Tsuji,Nobuyuki Fujita,Masaya Nakamura 대한척추신경외과학회 2021 Neurospine Vol.18 No.1
Objective: Diffuse idiopathic skeletal hyperostosis (DISH) causes spinal ankylosis, which can result in patients suffering specific spinal fractures that lead to a reduction in the activities of daily life in older patients. Currently, DISH is associated with diabetes mellitus and cardiovascular disease; however, the association between DISH and metabolic syndrome has not been established. The purpose of this study was to investigate a potential association between DISH and metabolic syndrome. Methods: We retrospectively reviewed clinical data from consecutive subjects undergoing the musculoskeletal health medical checkups, and enrolled 327 subjects (174 men and 153 women; mean, 63.4±13.7-years). Subjects who had spinal ankylosis at least 4 contiguous vertebral bodies were classified as the DISH group (n=39) while the others were part of the non-DISH group (n=288). The definition of the metabolic syndrome comes from diagnostic criteria used by the Japanese Society for Internal Medicine. Age, sex, body max index (BMI), hematological evaluation, blood pressure, presence of metabolic syndrome, the visceral fat area on abdominal computed tomography, and spinal epidural lipomatosis (SEL) on magnetic resonance imaging were evaluated. Results: Compared to the non-DISH group, in the DISH group, mean age (DISH group, 74.3 years; non-DISH group, 1.9 years; p<0.001), male prevalence were higher (DISH group, 82.1%; non-DISH group, 49.3%; p<0.001), and BMI was greater (DISH group, 24.8; non-DISH group, 23.0; p=0.006). the metabolic syndrome was more frequently observed in DISH group (28.9%) than in the non-DISH group (16.0%) (p=0.045). The visceral fat area was significantly larger in the DISH group than in the non-DISH group (DISH group, 130.7±58.2 cm2; Non-DISH group, 89.0±48.1 cm2; p<0.001). The prevalence of SEL was similar between the 2 groups (10.3% in the DISH group vs. 8.7% in the non-DISH group; p=0.464). Poisson regression analysis revealed that the metabolic syndrome was significantly associated with DISH with odds ratio of 2.0 (95% confidence interval, 1.0–3.7; p=0.004). Conclusion: Metabolic syndrome was significantly associated with DISH. Our data showed metabolic syndrome is potentially related to DISH.
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