Faculty Profiles - KOBAYASHI Koichi

MISC - KOBAYASHI Koichi

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坂本信, 小林公一

理論応用力学講演会講演論文集 54th ( 0 ) 193 - 194 2005.1

Language：Japanese Publisher：日本学術会議「機械工学委員会・土木工学・建築学委員会合同IUTAM分科会」

We consider an axisymmetric contact problem of a transversely isotropic layer which is bonded to a rigid foundation. The upper surface of the layer is smoothly clamped by an infinite rigid plate with a circular hole. A tensile stress is applied to the inside of the circular hole. The problem is reduced to an exact solution of an infinite system of simultaneous equations utilizing the method of expressing normal displacement in the circular region as an appropriate series. The effects of the layer thickness and the material anisotropy are addressed with the solution obtained here.

DOI： 10.11345/japannctam.54.0.85.0

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ラット皮質骨におけるvBMDと弾性率との関係

坂本信, 村田冬樹, 小林公一, 中村智哉, 佐藤憲二, 田辺裕治, 原利昭

バイオエンジニアリング講演会講演論文集 17th 67 - 68 2005.1

ラット大腿皮質骨の力学的性質と骨密度との関係

坂本信, 佐藤憲二, 田辺裕治, 小林公一, 村田冬樹, 坂井淳

日本実験力学会講演論文集 ( 4-4 ) 19 - 23 2005.1

Stress Wave Loadingによる人工股関節の力の伝達特性評価

田辺裕治, 大橋弘嗣, 涌井隆, 小林公一, 坂本信

日本実験力学会講演論文集 ( 4-4 ) 10 - 13 2005.1

ナノインデンテーションを用いたヒト歯象牙質の力学的特性分布 (2005年・バイオメカニクスワークショップ・新潟)

甲田文一, 坂本信, 小林公一

日本実験力学会講演論文集 ( 5 ) 45 - 51 2005

ホプキンソン棒法による関節軟骨の衝撃特性評価

柿木俊彦, 小林公一, 坂本信, 田辺裕治

日本非破壊検査協会大会講演概要集 2004 203 - 206 2004.11

ナノインデンテーションを用いたラット大腿皮質骨の力学的性質と骨密度との関係

佐藤憲二, 坂本信, 村田冬樹, 小林公一, 田辺裕治

日本非破壊検査協会大会講演概要集 2004 199 - 202 2004.11

MRIを利用した距腿関節における接触領域分布評価

渡辺圭一, 吉田秀義, 田辺浩気, 小林公一, 坂本信, 田辺裕治

日本機械学会バイオフロンティア講演会講演論文集 15th ( 15 ) 43 - 44 2004.11

Measurement of Water Content in Articular Cartilage Using Near Infrared Spectroscopy

浜田一成, 田辺裕治, 菊池達哉, 小林公一, 坂本信, 古賀良生

日本機械学会年次大会講演論文集 2004 ( Vol.5 ) 105 - 106 2004.9

Language：Japanese Publisher：一般社団法人日本機械学会

Articular cartilage is biphasic material consisting of solid and liquid, and there is difference in permeability between normal articular cartilage and OA articular cartilage. We can measure water content in specimen nondestructively using NIR spectroscopy. Then we applied NIR spectroscopy to nondestructive testing for physical property of articular cartilages. We deal with the two aspects of the detailed relations between recovery of absorbance and degeneration of human cartilage, that is, 1) relation between the degeneration of human articular cartilage and pattern of absorbance with respect to time after removal of indentation load, 2) relation between the degeneration of human articular cartilage graded by Mankin Score and variation of absorbance with time after removal indentation load. In the most of specimens graded as "normal", the absorbance initial decrease and the subsequent increase. In the specimens of "normal", the Mankin Score was able to be related to the time when absorbance had the minimum value. It is concluded that near infrared spectroscopy enables us to capture the increase of permeability with an increase of damage in articular cartilage.

DOI： 10.1299/jsmemecjo.2004.5.0_105

Distributions of Mechanical Properties of Human Teeth

坂井淳, 甲田文一, 坂本信, 小林公一, 黒江敏史, 伊藤秀美, 原利昭

日本機械学会年次大会講演論文集 2004 ( Vol.5 ) 67 - 68 2004.9

Language：Japanese Publisher：一般社団法人日本機械学会

Nanoindentation test results, reveled mechanical properties that are directly related to the local structure of the tooth. In this study, nano-hardness and nano-elastic modulus of human molar teeth were studied across the dentin-enamel junction (DEJ). Specimens were obtained from seven molar permanent teeth. Nano-hardness and nano-elastic modulus both decreased towards the DEJ. It is found that the nano-mechanical property profiles across the DEJ were due to a continuous variation in the ratios of relative amount of enamel and dentin. This result suggests that the DEJ displays a gradient in structure and that nanoindentation method show promise for further understanding its structure and function.

DOI： 10.1299/jsmemecjo.2004.5.0_67

渡辺圭一, 吉田秀義, 小林公一, 坂本信, 田辺裕治

日本実験力学会講演論文集 ( 4-2 ) 313 - 315 2004.7