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RISS 인기검색어
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- 저자 : Makoto Fujii (검색결과 13 건)
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Norifumi Fujii,Nobukazu Okimoto,Manabu Tsukamoto,Norimitsu Fujii,Kei Asano,Yoshiaki Ikejiri,Toru Yoshioka,Takafumi Tajima,Yoshiaki Yamanaka,Yukichi Zenke,Makoto Kawasaki,Junya Ozawa,Takuya Umehara,Sho 대한골다공증학회 2021 Osteoporosis and Sarcopenia Vol.7 No.4
Objectives: Physical activity to maintain bone mass and strength is important for hip fracture prevention. We aim to investigate the relationship between physical performance/activity status and bone mineral density (BMD)/hip structural analysis (HSA) parameters among postmenopausal women in Japan. Methods: Sixty-two postmenopausal women diagnosed with osteoporosis (mean age: 72.61 ± 7.43 years) were enrolled in this cross-sectional observational study. They were evaluated for BMD and HSA in the proximal femur by dual-energy X-ray absorptiometry and underwent several physical performance tests, the Geriatric Locomotive Function Scale of 25 questions (GLFS-25). Principal component analysis (PCA) was used to summarize data on the BMD/HSA parameters. Partial correlation analysis, multiple regression analysis, and structural equation modeling (SEM) were performed to investigate the relationship between physical performance/activity status and BMD/HSA parameters of the proximal femur. Results: In a partial correlation analysis adjusted for age and body mass index (BMI), GLFS-25 scores were correlated with HSA parameter (|r| = 0.260-0.396, P < 0.05). Principal component 1 (PC1) calculated by PCA was interpreted as more reflective of bone strength based on the value of BMD/HSA parameters. The SEM results showed that the model created by the 3 questions (Q13, brisk walking; Q15, keep walking without rest; Q20, load-bearing tasks and housework) of the GLFS-25 had the best fit and was associated with the PC1 score (β = -0.444, P = 0.001). Conclusions: The GLFS-25 score was associated with the BMD/HSA parameter, which may reflect the bone strength of the proximal femur as calculated by PCA.
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Evaluation of machinability in milling by controlling chip thickness using NC simulation
Makoto Nikawa,Masato Okada,Hiroki Mori,Yasuhiro Fujii,Minoru Yamashita 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.10
In this study, the machinability of the machining method for controlling chip thickness during the cutting operation was evaluated using simulation based on NC data. A comparative three-dimensional cutting test with a ball end mill was performed using both original and modified NC data. The modified NC data was created for the purpose of controlling the chip thickness generated when cutting with a constant rotation value and changing the feed rate of the original NC data. The results indicated that the actual chip thickness exceeded that of the calculated value although the thickness fluctuation was suppressed. The results revealed that the maximum cutting force and the fluctuation range of cutting force were low, and tool wear after cutting was suppressed using the modified NC data. The application of the method to the cutting of complicated shapes with high removing volume led to reductions in the cutting time by 31 %.
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Norifumi Fujii,Manabu Tsukamoto,Nobukazu Okimoto,Miyuki Mori,Yoshiaki Ikejiri,Toru Yoshioka,Makoto Kawasaki,Nobuhiro Kito,Junya Ozawa,Ryoichi Nakamura,Shogo Takano,Saeko Fujiwara 대한골다공증학회 2021 Osteoporosis and Sarcopenia Vol.7 No.2
Objectives: The relationship between weight-related load and bone mineral density (BMD)/bone microstructure under normal load conditions using high-resolution peripheral quantitative computed tomography (HR-pQCT) remains unconfirmed. The study aims to investigate the differences in effect of body mass index (BMI) on BMD/bone microstructure of loaded and unloaded bones, respectively, in Japanese postmenopausal women. Methods: Fifty-seven postmenopausal women underwent HR-pQCT on the tibia and radius. Correlation analysis, principal component (PC) analysis, and hierarchical multiple regression were performed to examine the relationship between BMI and HR-pQCT parameters. Results: Several microstructural parameters of the tibia and radius correlated with BMI through a simple correlation analysis, and these relationships remained unchanged even with an age-adjusted partial correlation analysis. PC analysis was conducted using seven bone microstructure parameters. The first PC (PC1) reflected all parameters of trabecular and cortical bone microstructures, except for cortical porosity, whereas the second PC (PC2) reflected only cortical bone microstructure. Hierarchical multiple regression analysis indicated that BMI was more strongly related to BMD/bone microstructure in the tibia than in the radius. Furthermore, BMI was associated with trabecular/cortical BMD, and PC1 (not PC2) of the tibia and radius. Thus, BMI was strongly related to the trabecular bone microstructure rather than the cortical bone microstructure. Conclusions: Our data confirmed that BMI is associated with volumetric BMD and trabecular bone microstructure parameters in the tibia and radius. However, although BMI may be more related to HRpQCT parameters in the tibia than in the radius, the magnitude of association is modest.
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Satomi Fujii,Makoto Mitsugi,Kaeko Nakamura,Yoshiyasu Ono,Toru Yamagami,Norihiko Takeuchi,Hiroki Ishizuka,Ronald Kibler 범태평양 응용언어학회 2022 Journal of Pan-Pacific Association of Applied Ling Vol.26 No.2
This article reports on a mixed method study that investigated the differences in Japanese EFL (English as a foreign language) learners’ satisfaction toward two different online teaching formats incorporated in universities during the COVID-19 situation: synchronous online courses (n = 324) and asynchronous on-demand courses (n = 323). Applying the items of the previously developed online satisfaction scale in the literature of online learning to EFL learning contexts, this study examined learner satisfaction from three main factors, engaged learning, agency, and assessment, as a quantitative inquiry. According to the Mann-Whitney U test, there were significantly higher results of engaged learning and assessment in synchronous online courses than in asynchronous ondemand courses, indicating a higher level of learner satisfaction in synchronous online courses. In addition, based on the qualitative textmining analysis of learner comments on their perceptions of the online courses they had taken, findings suggest that synchronous online courses accounted for higher percentages of positive comments compared to those in the asynchronous on-demand courses. This study shows that synchronous online teaching ensured higher satisfaction among Japanese EFL learners than asynchronous on-demand courses.
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