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Damage Evaluation Using Magnetic Properties in Stainless Steels under Biaxial Stress
Shimamoto, Akira,Ohkawara, Hiroshi,Yang, Sung-mo,Choi, Dae-kue,Akamatsu, Satoshi The Japan Institute of Metals 2008 MATERIALS TRANSACTIONS Vol.49 No.3
<P>Various stainless steels were investigated to examine the new NDE technique. The new NDE technique did not depend on either magnetization or demagnetization of materials. The magnetic flux caused by stress concentration in stainless steels was examined with the ultra sensitive magnetic flux density meter. Tensile and biaxial fatigue tests were conducted to observe the magnetic flux leakage. Results from biaxial fatigue tests indicated that the measured magnetic flux curves had local periodical cycles with global increasing tendencies. The defect evaluation would be possible by comparing the flux density value at the stress concentration regions with that of other areas.</P>
Toshiya Shimamoto,Katsuhisa Uchino,Akira Mori,Kengo Nojima,Junichi Iiyama,Yohei Misumi,Mitsuharu Ueda,Makoto Uchino 대한재활의학회 2022 Annals of Rehabilitation Medicine Vol.46 No.5
Objective To clarify the profile of cognitive dysfunction and the effects of intensive exercise in spinocerebellar degeneration (SCD). Methods We enrolled 60 healthy controls and 16 patients with purely cerebellar type SCD without gait disturbance or organic changes other than cerebellar changes. To assess cognitive function, we evaluated the participants using the Mini-Mental State Examination (MMSE), Frontal Assessment Battery (FAB), and Montreal Cognitive Assessment-Japanese (MoCA-J) at admission and after intensive exercise. Results Compared to the controls, SCD patients showed significant cognitive decline. As a result of intensive exercise, significant improvements in motor and cognitive functions were observed: the MMSE score improved from 27.7±1.9 to 29.0±1.3 points (p<0.001); the FAB score improved from 14.8±2.2 to 15.8±2.0 points (p=0.002); and the MoCA-J score improved from 24.6±2.2 to 26.7±1.9 points (p<0.001). For sub-scores, significant improvements were noted in serial 7, lexical fluency, motor series, and delayed recall. Conclusion Our study indicates that intensive exercise can be effective not only for motor dysfunction but also for cognitive dysfunction (Clinical Trial Registration No. UMIN-CTR: UMIN000040079).
SPECTRAL EVOLUTION OF NOVAE IN THE NEAR-INFRARED BASED ON AKARI OBSERVATIONS
ITSUKI SAKON,TAKASHI ONAKA,Fumihiko Usui,SAYAKA SHIMAMOTO,RYOU OHSAWA,Takehiko Wada,Hideo Matsuhara,AKIRA ARAI 한국천문학회 2017 天文學論叢 Vol.32 No.1
We have carried out the near-infrared spectroscopic observations of recent classical novae (e.g., V2468Cyg, V1280Sco) within a few years from the outburst with AKARI as a part of AKARI Open Time Observing Program for Phase 3-II "Spectral Evolution of Novae in the Near-Infrared based on AKARI Observations (Proposal ID: SENNA)". The homogeneous datasets of near-infrared spectra from 2.5 $\mu$m to 5 $\mu$m with AKARI/IRC collected in this program are useful to infer the physical conditions of the shell formed by the ejected materials, to examine the chemical properties of the ejecta gas, and to examine the properties of dust formed in the nova ejecta.
광탄성 실험 하이브리드 법에 의한 이축 인장하중이 균열 선단장에 미치는 영향
신동철(Dong-Chul Shin),남정환(Jeong-Hwan Nam),황재석(Jai-Sug Hawong),Akira SHIMAMOTO,Katsuhiko WATANABE 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this study, the hybrid method for photoelasticity was introduced and applied to the fracture problems of the isotropic polycarbonate plate with a central crack under uniaxial or biaxial tensile loadings. And then, the influences of tensile load biaxiality on the crack-tip stress fields, stress intensity factors and the shape of isocrhomatic fringe patterns were investigated.
형상기억효과를 가진 투과형 광탄성 실험용 모델재료 개발에 관한 연구
이효재,황재석,Lee, Hyo-Jae,Hwang, Jae-Seok,Shimamoto, Akira 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
The photoelastic model material with shape memory effect and the molding processes for the material are developed in this research. The matrix and fiber of the photoelastic model material developed in this research are epoxy resin (Araldite to hardner 10 to 3 (weight ratio)) and wire of $Ti_50-Ni_50$ shape memory alloy, respectively. It is called Ti50-Ni50 Shape Memory Alloy Fiber Epoxy Composite $(Ti_50-Ni_50SMA-FEC).$ Ti50-Ni50 SMA-FEC is satisfied with the requirements of the photoelastic model material and can be used as a photoelastic model material. The maximum recovering strain of $Ti_50-Ni_50$SMA-FEC is occurred at $80^{\circ}C$ in any prestrain of $Ti_50-Ni_50$ shape memory alloy fiber and in any fiber volume ratio. Recovering strain(force) is increased with the increment of the prestrain and the fiber volume ratio. The best prestrain of $Ti_50-Ni_50$SMA-FEC is 5% for the recovering force among 1%, 3%, 5%.