Hidenori Yoshida

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Study of the distribution of induced eddy currents in the vicinity of foramen magnum for the head model by magnetic stimulation

Electroencephalography and Clinical Neurophysiology (1996)

Kazutomo Yunokuchi Hidenori Yoshida Katsuro Mamitsuka Toshiaki Asakura

Foramen magnum

10.1016/0013-4694(96)84770-5

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FUNDAMENTAL STUDY ON EFFECTS OF DIFFERENCE IN STRESS ON FLOW-DEFORMATION COUPLING BEHAVIOURS OF DISCONTINUOUS ROCK MASS

Journal of Japan Society of Civil Engineers Ser C (Geosphere Engineering) (2013)

Hidenori Yoshida Ryuichiro OKAMURA Tatsuya Sakamoto

岩盤の変形および透水特性は,岩盤に包含される不連続面に支配されることが知られている.トンネルなどの空洞が掘削される場合,トンネル周辺岩盤の応力は複雑に変化するが,その際の不連続面の変形および透水特性の変化については,依然,不明瞭な点も多い.そこで本研究では,変形試験と透水試験を同時に行うことのできる独自の試験機を用いて,人工供試体に対して透水-変形連成試験を実施し,不連続面の有無,開口部の有無,そして応力の変化などが,供試体の変形および透水特性に及ぼす影響について調べた.その結果,不連続面を有する供試体において,応力を変化させた際に,不連続面を含む供試体の場合,透水係数が急激に変化するのに対し,不連続面を含まない供試体ではほとんど変化しないことなどが判明した.

10.2208/jscejge.69.186

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Numerical Study on Shear Behavior of Discontinuity of Rock Mass

Theoretical and applied mechanics Japan (2009)

Takakuni Tatsumi Hidenori Yoshida

Discontinuity (linguistics)

10.11345/nctam.57.67

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Micromechanics-Based Continuum Model for Geological Material

Journal of Applied Mechanics (1998)

Hidenori Yoshida Hideyuki Horii

Mechanical behaviors of geological material are governed by the existences and behaviors of microstructures such as joints or microcracks in rock mass. To find solutions to engineering problems such as design of a large scale cavern in jointed rock mass, the problems must be set as mathematical problems or boundary value problems in many cases."Micromechanics-based Continuum (MBC) Modeling" provides a constitutive equations in the equivalent continuum problem by taking average of strain and stress over a representative volume element. This article introduces some examples of the application of the MBC modeling to geological materials and demonstrates how successfully the MBC modeling answers engineering requests.

Micromechanics

Representative elementary volume

Multiscale Modeling

Geomechanics

10.2208/journalam.1.527

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907 Determination of Joint Contact Area Using MR Imaging

The proceedings of the JSME annual meeting (2008)

Hidenori Yoshida Makoto Sakamoto Koichi KOBAYASI Yuji TANABE

The analysis of joint kinematics aid contact area by MRI has been performed. The determination of contact is important to obtain the contact area This has been performed by visual. However, the quantitative determination of aortal is Nuked for measurement of contact area The purpose of this study was to demonstrate the objective determination of contact using two hog's knee. Simultaneous measurement of contact area was made using both the pressure sensitive film technique and MRI. The contact area was obtained by changing the signal intensity ratio. The validity of the MRI method was assessed, and the optimum signal intensity ratio of MRI was found out Good agreement was found between the MRI and the pressure sensitive film techniques.

Contact area

Intensity

SIGNAL (programming language)

10.1299/jsmemecjo.2008.6.0_139

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Three-dimensional Contact Analysis of Human Wrist Joint using MRI

Jikken rikigaku (2009)

Keisuke SASAGAWA Makoto Sakamoto Hidenori Yoshida Koichi Kobayashi Yuji TANABE

The wrist is a complex joint, consisting of the eight small carpal bones that articulate with each other, the metacarpals distally, and the radius, ulna, and triangular fibrocartilage complex proximally. The wrist joint carries out complicated motions that combine palmar/dorsal flexion with radio/ulnar deviation. Knowledge of in vivo joint mechanics is important for understanding pathological mechanisms and the treatment of various joint problems. To examine wrist joint contact mechanisms, in vitro cadaveric studies have been performed using pressure-sensitive film. Investigations on in vivo joint contact mechanisms for wrist motion have rarely been reported. The aim of this study is to investigate in vivo wrist joint contact mechanisms during palmar/dorsal flexion by magnetic resonance imaging (MRI). Magnetic Resonance scanning was performed on the left wrist of twelve participants using a 1.5T-MRI system (Achieva, Philips Medical Systems, Best, Netherlands). The wrist joint was scanned at 5 positions (palmar flexion, –30 degree; neutral, 0 degree; and dorsal flexion, 30, 60 and 90 degrees). Quantitative analysis of wrist joint contact mechanisms was performed for 12 normal radioscaphoid and radiolunate joints. The in-plane motions of the scaphoid and lunate were measured. The contact area at the radioscaphoid joint was significantly greater than that at the radiolunate joint in all wrist positions. The contact area increased with increasing wrist angle, and the contact distributions indicated by 3–D models of the scaphoid and lunate were moved during palmar/dorsal flexion. Contributions of the scaphoid and lunate to in-plane motion at 60 degrees of dorsal flexion were 74% and 52%, respectively.

Cadaveric spasm

Contact area

10.11395/jjsem.9.s167

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Cilostazol Reduces Periprocedural Hemodynamic Depression in Carotid Artery Stenting

Neurologia medico-chirurgica (2013)

Masanori Tsutsumi Hiroshi Aikawa Kouhei Nii Housei Etou Kimiya Sakamoto

The clinical effects of two different types of antiplatelet drugs, cilostazol and thienopyridine drugs, were compared in patients treated by carotid artery stenting (CAS). Two hundred patients scheduled for CAS were randomized to either cilostazol or a thienopyridine drug (ticlopidine or clopidogrel). The study was conducted in open-label design. Aspirin was also given to all patients. All episodes of periprocedural hemodynamic instability (bradycardia, hypotension) were recorded together with all instances of stroke, cardiac morbidity, and death within 30 days of the procedure. Angiographic follow-up studies were conducted about 6 months after CAS. Finally, 197 patients were enrolled in this study; 97 were treated with cilostazol (cilostazol group) and 100 with a thienopyridine drug (thienopyridine group). In the 30-day follow-up period, the incidence of stroke, cardiac adverse effects, and death was not significantly different between the 2 groups (cilostazol group 7.2%, thienopyridine group 11.0%; p = 0.85). The incidence of intra- and postprocedural bradycardia was significantly lower in the cilostazol group (cilostazol group 18.6% and 2.1%, thienopyridine group 40.0% and 18.0%, respectively; p < 0.01). Although the incidence of intraprocedural hypotension did not significantly differ between the 2 groups, postprocedural hypotension was significantly lower in the cilostazol group (16.5% vs. 34.0%, p < 0.01). In-stent restenosis on follow-up angiograms was lower in the cilostazol group but not significantly (0% vs. 4.4%, p = 0.12). This small open-label study shows that cilostazol may reduce periprocedural bradycardia and hypotension compared with thienopyridine drugs in patients treated by CAS.

Cilostazol

Thienopyridine

Stroke

10.2176/nmc.53.163

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President’s Foreword

Urologia Internationalis (1991)

Emil A. Tanagho U. Jonas A. E. J. L. Kramer Akira Kondo Hiroshi Noto

10.1159/000282237

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