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RISS 인기검색어
- 검색키워드
- 저자 : Minematsu, Fumiaki (검색결과 6 건)
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Minematsu, Fumiaki,Nomoto, Toshihiro 통신위성우주산업연구회 2001 Joint Conference on Satellite Communications Vol.2001 No.-
This paper describes a basic method to estimate satellite-transmitting power to compensate for rain attenuation by an advanced broadcast satellite system in which a beam steering antenna is employed for rain attenuation compensation. A method to estimate the mode of peak rain attenuation in a certain 10-minute-rainfall is proposed in this paper. Satellite-transmitting power needed to compensate for rain attenuation by use of 10-minute-rainfall data collected from about 1300 points in Japan is estimated. As a result, it is shown that an additional satellite transmitting power of about 1000 W with plural boosted beams, which are about 100km in diameter, might be able to compensate for most of rain attenuation events on Ku band in Japan.
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Possible effects of whole body vibration on bone properties in growing rats
Akira Minematsu,Yasue Nishii,Hidetaka Imagita,Susumu Sakata 대한골다공증학회 2019 Osteoporosis and Sarcopenia Vol.5 No.3
Objectives: To examine the effects of whole body vibration (WBV) on bone properties in growing rats, and to explore the optimal conditions for enhancing bone properties. Methods: Thirty-six 4-week-old male rats were divided into 1 control and 5 experimental groups. Each experimental group underwent WBV at 15, 30, 45, 60, and 90 Hz (0.5 g, 15 min/d, 5 d/wk) for 8 weeks.We measured bone size, muscle weight and bone mechanical strength of the right tibia. Trabecular bone mass and trabecular bone microstructure (TBMS) of the left tibia were analyzed by micro-computed tomography. Serum levels of bone formation/resorption markers were also measured. Results: WBV at 45 Hz and 60 Hz tended to enhance trabecular bone mass and TBMS parameters. However, there was no difference in maximum load of tibias among all groups. Serum levels of bone resorption marker were significantly higher in the 45-Hz WBV group than in the control group. Conclusions: WBV at 45e60 Hz may offer a potent modality for increasing bone mass during the period of rapid growth. Further studies are needed to explore the optimal WBV conditions for increasing peak bone mass and TBMS parameters. WBV modality may be a potent strategy for primary prevention against osteoporosis.
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Femoral bone structure in Otsuka Long-Evans Tokushima Fatty rats
Akira Minematsu,Tomoko Hanaoka,Yoshihiro Takada,Shunji Okuda,Hidetaka Imagita,Susumu Sakata 대한골다공증학회 2016 Osteoporosis and Sarcopenia Vol.2 No.1
Objectives: Type 2 diabetes mellitus (T2DM) increases fracture risk despite normal to high levels of bone mineral density. Bone quality is known to affect bone fragility in T2DM. The aim of this study was to clarify the trabecular bone microstructure and cortical bone geometry of the femur in T2DM model rats. Methods: Five-week-old Otsuka Long-Evans Tokushima Fatty (OLETF; n ¼ 5) and Long-Evans Tokushima Otsuka (LETO; n ¼ 5) rats were used. At the age of 18 months, femurs were scanned with micro-computed tomography, and trabecular bone microstructure and cortical bone geometry were analyzed. Results: Trabecular bone microstructure and cortical bone geometry deteriorated in the femur in OLETF rats. Compared with in LETO rats, in OLETF rats, bone volume fraction, trabecular number and connectivity density decreased, and trabecular space significantly increased. Moreover, in OLETF rats, cortical bone volume and section area decreased, and medullary volume significantly increased. Conclusions: Long-term T2DM leaded to deterioration in trabecular and cortical bone structure. Therefore, OLETF rats may serve as a useful animal model for investigating the relationship between T2DM and bone quality. © 2016 The Korean Society of Osteoporosis. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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Akira Minematsu,Kan Hazaki,Akihiro Harano, M.D,Nozomi Okamoto 대한골다공증학회 2017 Osteoporosis and Sarcopenia Vol.3 No.2
Objectives: This study aimed to investigate differences in physical function by bone mass category as assessed by speed of sound, and the association between bone mass and physical function in Japanese elderly women. Methods: Participants (65 years, n ¼ 954) were divided into the osteoporosis, osteopenia, and normal groups based on speed of sound values, and physical function parameters were compared among groups. In addition, the predictive ability of physical function for low bone mass was determined by area under the curve analysis. Data were collected in 4 cities in Nara, Japan, in 2007 or 2008. Results: All physical functions were significantly lower in the osteoporotic group than in the normal group. Lower bone mass was associated with poor muscle strength and physical function after adjusting for age, height and weight. In addition, one-leg standing time and 10-m gait time were predictive of low bone mass (osteopenia and osteoporosis levels, respectively). Elderly women with low physical function, especially those with a short one-leg standing time, should be suspected of having decreased bone mass. Conclusions: Measurements of physical function can effectively identify elderly women with low bone mass at an early stage without the need for bone mass measurements. In particular, one-leg standing time and 10-m gait time were good predictors of low bone mass, and is easy to measure, low-cost, and can be self-measured. These findings will be helpful in the prevention and treatment of osteoporosis.
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Sachi Higuchi,Seiichi Yoshida,Takeo Minematsu,Yutaka Hatano,Akifumi Notsu,Takamichi Ichinose 대한피부과학회 2023 Annals of Dermatology Vol.35 No.4
Background: In Japan, neonates have typically been bathed in a bathtub immediately after birth because bathing is a custom for cleansing impurities. However, dry technique has been introduced into many institutions since 2000. There is little scientific evidence on the ben- efit or harmfulness of either method to neonatal skin, and consequently, opinion remains split on which method is superior. Objective: The purpose of the present study was to determine whether bathing or the dry technique of cleaning is better in maintaining skin health in the early neonatal period. Methods: Transepidermal water loss (TEWL) and skin pH, considered an index of skin bar- rier function, were measured in each group. Tumor necrosis factor (TNF)-alpha and inter- leukin (IL)-6, which are inf lammatory cytokines released by keratinocytes, were measured by skin blotting. Results: TEWL and skin pH of neonates were lower with the dry technique than with bath- ing. The expression level of IL-6 and TNF-α in chest skin of neonates was higher with bath- ing than with the dry technique. Conclusion: These results suggest that the dry technique may maintain skin health better than bathing in the early neonatal period.
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