Faculty Profiles - KOBAYASHI Koichi

MISC - KOBAYASHI Koichi

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ウシ関節軟骨のインデンテーション試験による弾性率測定

平木大介, 坂本信, 小林公一, PRAMUDITA Jonas A, 田邊裕治

日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM) 54th ( 0 ) ROMBUNNO.E043 2017.3

MRIによるヒト中指中手指節関節の三次元生体内接触挙動

森清友亮, 坂本信, 杉田魁人, 風間清子, 小林公一, 田邊裕治

日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM) 54th ( 0 ) ROMBUNNO.E042 2017.3

二方向スロットラジオグラフィと三次元形状モデルによる股関節位置評価法

岡庭大祐, 中原大輔, 小林公一, 坂本信, 田邊裕治

日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM) 54th ( 0 ) ROMBUNNO.E044 2017.3

In vivo three-dimensional analysis of the contact behavior of the human metacarpophalangeal joint of the middle finger using magnetic resonance imaging

SAKAMOTO Makoto, KOBAYASHI Koichi, SUGITA Kaito, KAZAMA Kiyoko, MORISE Yusuke, TANABE Yuji

The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2017 ( 0 ) 2017

Evaluation method for implant positioning of artificial hip joint using bi-plane standing slot radiography

OKANIWA Daisuke, NAKAHARA Daisuke, TANABE Yuji, KOBAYASHI Koichi, SAKAMOTO Makoto

The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2017 ( 0 ) 2017

立位脊柱矢状面最大後弯と最大前弯の変曲椎に関する検討

岡本昌士, 長谷川和宏, 初鹿野駿, 小野真稔, 下田晴華, 本間隆夫, 小林公一, 坂本信

日本側彎症学会演題抄録集 51st 2017

生体内コーンビームCT画像による三次元自動歯軸

坂本信, 森清友亮, 小林公一, 亀田剛, 坂井幸子, 遠藤英昭, 田邊裕治

日本機械学会年次大会講演論文集(CD-ROM) 2016 ( 0 ) ROMBUNNO.S0220202 2016.9

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

The tooth axis is important as a morphological reference axis; however, a general definition of the tooth axis has not been established. This study presented a novel method of automatically calculating three-dimensional tooth axes on in vivo Cone-Beam Computed Tomography (CBCT) images. In this study, 36 teeth were obtained from 12 central and lateral incisors, and canines of 3 human subjects, respectively. Human in vivo images were obtained using a CBCT at a spatial resolution of 0.183 mm3 . The automatically tooth axis (PC-A) was calculated using principal component (PC) analysis of the segmented tooth and mandible. In experimental results using 36 teeth, the average relative angular errors between the tooth axes T-A manually specified by three dentists and the PC-A automatically calculated by the proposed method were 2.2 ± 1.4° for central incisors, 1.7 ± 1.0° for lateral incisors, 2.3 ± 1.4° for canines, respectively. The relative distance errors between the T-A and the PC-A were 0.39 ± 0.17 mm, 0.39 ± 0.21 mm and 0.63 ± 0.34 mm for central incisors, lateral incisors and canines, respectively. The experimental results of this study demonstrate that the proposed method of CBCT can accurately and automatically identify individual three-dimensional tooth axes.

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皮膚マーカから推定した3次元膝関節運動の誤差評価

小林公一, 風間清子, 坂本信

日本機械学会年次大会講演論文集(CD-ROM) 2016 ( 0 ) ROMBUNNO.S0220203 2016.9

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

Although the trajectories of skin markers tracked with an optical motion capture system have widely been used as the estimates of the underlying bone motions, the reliability of the kinematics parameters derived from the skin marker-based technique has often questioned due to soft tissue artefact. The objective of this study was to evaluate soft tissue artefact associated with knee flexion. One healthy female subject participated in this study. The subject underwent CT scan to reconstruct 3D femoral and tibial bone models. Twenty two polymeric markers with radio-opaque beads in its center were attached to the thigh and the shank. The initial coordinate transformation matrices were determined between skin marker cluster and the femur or the tibia using an image registration technique at extension of the knee. The movements of the femur and tibia from extension to 90° of flexion of the knee were recovered using two methods: 1) Placing the bone models according to the initial coordinate transformation matrices. 2) Placing the bone models using updated coordinate transformation matrices at every time step by a point-cluster technique. Although the latter method created more realistic bony movements especially at large knee flexion angles, a certain amount of soft tissue artefact still remained.

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被覆層‐基質物体のインデンテーション法における三次元弾性理論解析

三浦鴻太郎, 坂本信, 小林公一, PRAMUDITA Jonas A, 田邊裕治

日本機械学会年次大会講演論文集(CD-ROM) 2016 ( 0 ) ROMBUNNO.J0250301 2016.9

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

We consider an elastic contact problem for indentation test of layer-substrate body. An elastic layer assumed to be perfectly bonded to an elastic semi-infinite substrate. This problem called Boussinesq's problem which is axisymmetric mixed boundary value problem in elasticity theory. The elastic layer is smoothly indented by a flat-ended cylindrical and spherical indenter. The analytical solutions are obtained by solving an infinite system of simultaneous equations using the method of expressing a normal contact stress at the upper surface of the elastic layer as an appropriate series. Convergence can be achieved using less than 10 terms of the series. The accuracy of values of present numerical results is verified by comparing the dimensionless axial load of present results with results of some previous literatures. Additionally, this paper presents not only distribution of the dimensionless normal contact stress under cylindrical and spherical indenters but also distribution of the dimensionless normal displacement at the upper surface of the elastic layer. Numerical results are given for several combinations of the ratio of shear modulus, Poisson's ratio of elastic layer and substrate and the thickness of elastic layer. These results may establish the foundation for indentation test of layer-substrate composite and provide guideline for design of mechanical property of layered materials.

DOI： 10.1299/jsmemecj.2016.J0250301

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核磁気共鳴画像を用いたヒト示指近位指節間関節の三次元生体内接触挙動解析

坂本信, 森清友亮, 風間清子, 近藤達也, 小林公一, 田邊裕治

日本実験力学会講演論文集 ( 16 ) 121‐122 2016.9

大腿部および下腿部の皮膚マーカから推定した3次元膝関節運動の評価誤差

小林公一, 風間清子, 坂本信

日本実験力学会講演論文集 ( 16 ) 119‐120 2016.9

歯科バイオメカニクス三次元歯軸の自動決定法

坂本信, 小林公一, 坂井幸子, 遠藤英昭

非破壊検査 65 ( 4 ) 163‐168 - 168 2016.4

生体内コーンビームCT画像を用いた三次元歯軸の自動決定法

坂本信, 森清友亮, 小林公一, 亀田剛, 坂井幸子, 遠藤英昭, 田邊裕治

日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM) 53rd ROMBUNNO.910 2016.3

2方向スロットラジオグラフィによる立位3次元下肢アライメント評価法

岡庭大祐, 高橋匠, 小林公一, 坂本信, 田邊裕治

日本機械学会北陸信越支部総会・講演会講演論文集(CD-ROM) 53rd ROMBUNNO.908 2016.3

908 Three-Dimensional Evaluation of Lower Leg Alignment Using Bi-Plane Slot Radiography

OKANIWA Daisuke, TAKAHASHI Takumi, KOBAYASHI Koichi, SAKAMOTO Makoto, TANABE Yuji

2016 ( 53 ) "908 - 1"-"908-5" 2016.3

910 Automatic Determination Technique of Three-Dimensional Tooth Axis Using In Vivo Cone-Beam CT Images

SAKAMOTO Makoto, MORISE Yusuke, KOBAYASHI Koichi, KAMEDA Takashi, HAYASHI-SAKAI Sachiko, ENDO Hideaki, TANABE Yuji

2016 ( 53 ) "910 - 1"-"910-3" 2016.3

2方向スロットラジオグラフィと3次元形状モデルによる下肢アライメント評価法

小林公一, 高橋匠, 岡庭大祐, 坂本信, 田邊裕治

バイオエンジニアリング講演会講演論文集 28th (CD-ROM) ROMBUNNO.1F25 2016

1F16 In Vivo Three-Dimensional Analysis of the Contact Motion Behavior of the Proximal Interphalangeal Joint of the Index Finger Using MRI

MORISE Yusuke, SAKAMOTO Makoto, KAZAMA Kiyoko, KONDO Tatsuya, KOBAYASHI Koichi, TANABE Yuji

The Proceedings of the Bioengineering Conference Annual Meeting of BED/JSME 2016 ( 0 ) _1F16 - 1_-_1F16-3_ 2016

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

The proximal interphalangeal (PIP) joint of the finger are formed by the articulation between the proximal phalanges head (PPH) and the middle phalanges base (MPB). The PPH has two rounded condyles, separated by a shallow central groove. The opposing surface of the MPB has two shallow concave facets separated by a central ridge. Determination of distribution of joint contact and joint motion are necessary to understanding the progression of joint deterioration and to the design of appropriate implants for finger joint arthroplasty. Traditionally, such data have been obtained from in vitro study of cadaveric specimens. Magnetic resonance imaging (MRI) has recently been shown to be a valid method of quantifying the joint contact area, indicating the potential for in vivo assessment. In the present study, we adapted an MRI system to study the three-dimensional in vivo articular cartilage contact areas and contact distributions of the PIP joint of the index finger on adopting three flexion angles.

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OS19-4 Elastic Theory of Indentation Test of Biological Tissues and Approximate Solution(Orthopaedic Biomechanics,OS19 Biomechanics and its applications,BIOMECHANICS)

Miura Kotaro, Sakamoto Makoto, Kobayashi Koichi, Tanabe Yuji

Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2015 ( 14 ) 248 - 248 2015.10

OS19-5 Biplanar Slot-Scan Digital Radiography for Evaluation of Three-Dimensional Lower Extremity Alignment with the Use of Bone Surface Models(Orthopaedic Biomechanics,OS19 Biomechanics and its applications,BIOMECHANICS)

Kobayashi Koichi, Takahashi Takumi, Okaniwa Daisuke, Sakamoto Makoto, Tanabe Yuji

Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2015 ( 14 ) 249 - 249 2015.10

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