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RISS 인기검색어
- 검색키워드
- 저자 : Jun Kohyama (검색결과 5 건)
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Lifestyle Habits Associated with Poor Defecation Habit among Pupils in Japan
Jun Kohyama 대한소아소화기영양학회 2020 Pediatric gastroenterology, hepatology & nutrition Vol.23 No.6
Purpose: Not enough attention has been paid to defecation habits in Japan. This study aimed to emphasize the importance of defecation habits on health and function in Japanese pupils. Methods: Using multiple regression analysis, 2,722 questionnaires obtained from pupils in grades 5 to 12 were analyzed to determine lifestyle habits associated with defecation frequency. Results: Significant regression formulae for defecation scores were obtained for all school types: elementary school (ES) (adjusted R2=0.08, p<0.001), junior high school (JHS) (0.09, p<0.001), and senior high school (SHS) (0.15, p<0.001). The following factors were associated with poorer defecation scores, according to school type: female gender (all 3 school types), breakfast skipping (elementary and JHSs), lower physical activity (JHSs and SHSs), and longer school-day screen time (elementary and SHSs). In addition, poorer selfreported academic performance scores in ES, less standardized body mass index (BMI) in JHS, and shorter non-school- day screen time scores in SHS, were associated with poorer defecation scores. Conclusion: Poor defecation frequency showed significant associations with various lifestyle habits, such as breakfast skipping, physical activity, and screen time, among pupils. Academic performance and standardized BMI were also associated with defecation frequency. More attention should be paid to defecation frequency to sustain health and function in pupils.
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김성훈(Seong-Hoon Kim),윤한기(Han-Ki Yoon),박준수(Jun-Soo Park),A.Kohyama 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this study, Nano Infiltration Transient Eutectic Phase SiC (NITE-SiC) was fabricated by hot pressing method with nano-SiC powder whose a particle size is 30㎚ and less on the average. Alumina (Al₂O₃), yttria (Y₂O₃) and silica (SiO₂) were used for sintering additives. NITE-SiC was fixed Al₂O₃, Y₂O₃ and then ratios of SiO₂ were changed as few kinds. NITE-SiC was annealed under different temperature in normal condition used mini furnace in order to observe the anodization process. Flexural strength of specimen fabricated with Al₂O₃-Y₂O₃-SiO₂ system as sintering additive at 1800℃ was about 610 ㎫. The weight loss of specimens annealed under 1400℃ is less than 3%. However, specimens annealed at 1500℃ or higher show pockets of erosion and heavy weight loss. NITE-SiC was carried out by observing conditions of oxide on the surface of alloy according to the conditions of its heat treatment and by analysing the change in composition on its surface by FE-SEM.
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LPS-SiC 세라믹스 제조시 소결조제 SiO₂의 영향
정헌채(Hun-Chae Jung),윤한기(Han-Ki Yoon),박준수(Jun-Soo Park),A.Kohyama 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Monolithic liquid phase sintered SiC (LPS-SiC) was made by hot pressing method with nano-SiC powder whose a particle size is 30nm and less on the average. Alumina (Al₂O₃), yttria (Y₂O₃) and silica (SiO₂) were used for sintering additives. To investigate effects of SiO₂, Al₂O₃/Y₂O₃ composition was fixed and then ratios of SiO₂ were changed as four kinds. Materials have been sintered for 1 hour at 1760 ℃, 1780 ℃ and 1800 ℃ under the pressure of 20MPa. The system of sintering additives which affects a property of sintering as well as the influence depending on compositions of sintering additives were investigated by measurement of density, mechanical properties such as flexural strength elastic modulus were investigated to make sure of the optimum condition which is about matrix of SiCf/SiC composites. Sintered density, flexural strength of fabricated LPS - SiC increased with increasing the sintering temperature. Particularly, relative density of sintered body at 1800 ℃ with the less content of SiO₂, specimen of AYSa-1800 was 95 %. Also, flexural strength and elastic modulus were 587.5 ㎫ and 216.3 ㎬, respectively. It is superior values than that of LPS-SiC with Al₂O₃-Y₂O₃ system.
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이영주(Young-Ju Lee),윤한기(Han-ki Yoon),박이현(Yi-Hyun Park),박준수(Jun-Soo Park),A. Kohyama 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Nano Infiltration Transient Eutectic Phase - Silicon Carbide (NITE-SiC) have been fabricatied by a Hot Pressing (HP) process, using SiC powder with an average size of about 30㎚. Alumina (Al₂O₃) and Yttria (Y₂O₃) were used for additives meterials. These mixed powders were sintered at the temperature a of 1300℃, 1650℃, 1800℃ and 1900℃ under an applied pressure of 20㎫. Densification of microstructure gives an effect to density and strength. Specially, Densification Mechanism basically is important from the sintering which use the HP. In this study, nano size particle was used to HP and the densification of NITE-SiC mechanism by a press displacement appers investigated. The slope changes places by a press displacement shared a at three steps. The mechanism on the densification of each sintering temperature was investigated. The each step is shows a with each other different mechanism quality.
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