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Satoshi Kato,Satoru Demura,Yuki Kurokawa,Naoki Takahashi,Kazuya Shinmura,Noriaki Yokogawa,Noritaka Yonezawa,Takaki Shimizu,Ryo Kitagawa,Hiroyuki Tsuchiya 대한재활의학회 2020 Annals of Rehabilitation Medicine Vol.44 No.3
Objective To examine the efficacy and safety of an innovative, device-driven abdominal trunk muscle strengthening program, with the ability to measure muscle strength, to treat chronic low back pain (LBP) in elderly participants. Methods Seven women with non-specific chronic LBP, lasting at least 3 months, were enrolled and treated with the prescribed exercise regimen. Patients participated in a 12-week device-driven exercise program which included abdominal trunk muscle strengthening and 4 types of stretches for the trunk and lower extremities. Primary outcomes were adverse events associated with the exercise program, improvement in abdominal trunk muscle strength, as measured by the device, and improvement in the numerical rating scale (NRS) scores of LBP with the exercise. Secondary outcomes were improvement in the Roland-Morris Disability Questionnaire (RDQ) score and the results of the locomotive syndrome risk test, including the stand-up and two-step tests. Results There were no reports of increased back pain or new-onset abdominal pain or discomfort during or after the device-driven exercise program. The mean abdominal trunk muscle strength, NRS, RDQ scores, and the stand-up and two-step test scores were significantly improved at the end of the trial compared to baseline. Conclusion No participants experienced adverse events during the 12-week strengthening program, which involved the use of our device and stretching, indicating the program was safe. Further, the program significantly improved various measures of LBP and physical function in elderly participants.
Studies on Clothing Comfort Evaluation of Footwear by Measuring Psychophysiological Response
( Satoshi Hosoya ),( Masayoshi Kamuo ),( Masayuki Takatera ),( Tsugutake Sadoyama ),( Yoshio Shimizu ) 한국감성과학회 2002 춘계학술대회 Vol.2002 No.-
The footwear such as socks and shoes is the clothing which are necessary to our life. In this study, clothing comfort of the footwear was carried out by physiological responses and subjective evaluation. As a result, the effect to walking comfort by the height of a heel in female shoes became clear. Then suitability evaluation system of shoes was proposed from the measuring results. On the other hands, the clothing comfort of the hosiery was evaluated from ECG analysis. By this analysis, it became clear that the factor which influences the clothing comfort of the hosiery was the clothes pressure in the hosiery. In the future, plane shape of the foot and solid shape must be considered in order to design the hosiery.
Constructing MRI-based 3D precise human hand models for product ergonomic assessments
Yasutomo Shimizu,Keisuke Kawaguchi,Satoshi Kanai (사)한국CDE학회 2010 한국CAD/CAM학회 국제학술발표 논문집 Vol.2010 No.8
Since human hands play an important role in grasping and manipulating the product, the digital hand model which can reproduce the structure and the motion of the human hand with high-precision is very useful for virtual ergonomic assessment of the product. The purpose of this study is to develop a new method of MRI-based modeling of a digital hand whose precision is sufficient to reproduce virtual grasp postures for ergonomic assessments. The digital hand has 3D models of the bones and a skin surface extracted from MRI data. The bone link model has 2-DOF finger joint motion which can precisely approximate real motions using ICP algorithm and quaternion interpolation. And a skin surface deformation method can accurately reproduce the skin surface deformation around the ball of the thumb using the combination of traditional SSD (skeletal-subspace deformation) and RBF interpolation. The comparison of the simulated contact area of our hand model with the real one showed the effectiveness of the proposed model.
Vibration and Noise of Gears of Damping Alloy
Oda, Satoshi,Koide, Takao,Shimizu, Hisao,Miura, Kenzo 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
This paper presents a study on vibration and noise of gears of damping alloy. The logarithmic decrements of damping alloy were measured and compared with those of conventional steel. Vibration acceleration and sound pressure of helical gear pairs and spur planetary gear units of the damping alloy were measured under various running conditions using a power-absorbing-type gear testing machine, and the results were compared with those for conventional steel gears. Furthermore, the sound intensities of planetary gear units of damping alloy and conventional steel were also measured. The vibration and noise characteristics of these gears were determined.
Suzuki, Ginga,Shimizu, Satoshi,Torii, Mana,Tokue, Ai,Ying, Guo,Yoshinari, Masao,Hoshi, Noriyuki,Kimoto, Katsuhiko,Miura, Hiromi,Hayakawa, Tohru,Ohkubo, Chikahiro The Korean Academy of Prosthodonitics 2020 The Journal of Advanced Prosthodontics Vol.12 No.6
PURPOSE. This study evaluated the availability of multi-directionally forged (MDF) titanium (Ti) as a component of removable partial dentures (RPDs). MDF-Ti remarkably improved the mechanical properties of RPDs due to its ultrafine-grained structure. MATERIALS AND METHODS. The wear resistance, plaque adhesion, and machinability of MDF-Ti were tested. As controls, commercially pure (CP) titanium was used for wear, plaque adhesion, and machinability tests. For wear resistance, the volume losses of the titanium teeth before and after wear tests were evaluated. Plaque adhesion was evaluated by the assay of Streptococcus mutans. In the machinability test, samples were cut and ground by a steel fissure bur and carborundum (SiC) point. An unpaired t-test was employed for the analysis of the significant differences between MDF-Ti and the control in the results for each test. RESULTS. Wear resistance and plaque adherence of MDF-Ti similar to those of CP-Ti (P>.05) were indicated. MDF-Ti exhibited significantly larger volume loss than CP-Ti in all conditions except 100/30,000 g/rpm in machinability tests (P<.05). CONCLUSION. Although the wear resistance and plaque adherence of MDF-Ti were comparable to those of controls, MDF-Ti showed better machinability than did CP-Ti. MDF-Ti could be used as a framework material for RPDs.
An Ultra-precision Electronic Clinometer for Measurement of Small Inclination Angles
Siew?Leng Tan,Satoshi Kataoka,Tatsuya Ishikawa,So Ito,Yuuki Shimizu,Yuanliu Chen,Wei Gao,Satoshi Nakagawa 한국생산제조학회 2014 한국생산제조학회지 Vol.23 No.6
This paper describes an ultra-precision electronic clinometer, which is based on the capacitive?based fluid type, for detection of small inclination angles. The main parts of the clinometer low?noise electronics are two capacitance measurement circuits for converting the capacitances of the capacitors of the clinometer into voltages, and a differential amplifier for obtaining the difference of the capacitances, which is proportional to the input inclination angle. A 16 bit analog to digital (AD) converter is also embedded into the same circuit board, whose output is sent to a PC via RS-232C, for achieving a small noise level down to tens of μv. A compensation method, which is referred to as the delay time method for shortening the stabilization time of the sensor was also discussed. Experimental results have shown the possibility of achieving a measurement resolution of 0.0001° as well as the quick measurement with the delay time method.
감성(感性)디자인을 위한 조작성(操作性) 평가(平價) 소프트웨어의 개발(開發)
( Jae Yong Woo ),( Satoshi Hosoy A ),( Takatera Masa Yuki ),( Yoshio Shimizu ) 한국감성과학회 2004 추계학술대회 Vol.2004 No.-
The operability of a product that evaluated from a user``s viewpoint is useful in a product design for manufacturer. Moreover, it is important for carrying out a good design and impression of a product in an operation part. In this study, we developed the product evaluation system for manufacturing. It was possible to evaluate exactly ``intelligible operating method`` and ``the exact operation of convenience`` by an amateur using behavior analysis about operability evaluation. In an evaluation system, there are important elements such as simplifier, accuracy, and flexibility. Most of all, it should be made simplification of measurement and analysis. And then it has to improve of accuracy evaluation, develop of software of behavior analysis and create the manual for evaluation. As a result, it was possible that the foundation of the evaluation method which can be simple behavior analysis, classifying of an evaluator, regardless of finding improvement of simple nature and evaluation accuracy using compared with the conventional video appraisal method.