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GaAs 기판위에 성장된 단결정 AlAs 층의 선택적 산화 및 XPS ( X-ray photonelectron spectroscopy ) 분석
이용수 ( Young Soo Lee ),이용수 ( Young Soo Lee ),이정희 ( Jung Hee Lee ),태흥식 ( Heung Sik Tae ),이석헌 ( Suk Hun Lee ),이용현 ( Young Hyun Lee ) 한국센서학회 1996 센서학회지 Vol.5 No.5
A 1 ㎛ thick n-type GaAs layer with Si doping density of 1*10^17/㎤ and a 500Å thick undoped single crystalline AlAs layer were subsequently grown by molecular beam epitaxy on the n^+ GaAs substrate. The AlAs/GaAs layer was oxidized in N_2 bubbled H_2O vapor(95℃) ambient at 400℃ for 2 and 3 hours. From the result of XPS analysis, small amounts of As_2O_3, AlAs, and elemental As were found in the samples oxidized up to 2 hours. After 3 hours oxidation, however, various oxides related to As were dissolved and As atoms were diffused 3 hours the oxide surface. The as-grown AlAs/GaAs layer was selectively converted to Al_2O_3/GaAs at the oxidation temperature 400℃ for 3 hours. The oxidation temperature and time is very critical to stop the oxidation at the AlAs/GaAs interface and to form a defect-free surface layer.
지역사회 운동시설의 분포 및 건강인식과 신체활동 참여간의 관계
이용수(Young Soo Lee),손윤선(Youn Sun Son),이대택(Dae Taek Lee) 한국사회체육학회 2012 한국사회체육학회지 Vol.0 No.47
This study examined whether any physical environments related to physical activities in a community and/ or individual perception to health related variables would have any associations with physical activity level in the community residents. A total of 5,810 residents visited the regional community health center and 4,210 (1,886 men, 2,324 women) were identified for their residence. Demographic information, individual perception, and physical activity level were surveyed. Physical environments related to physical activities were evaluated by numbers and locations of the public exercise spaces and facilities, private exercise facilities, and the parks. No relationships were noticed between physical environments such as the public exercise spaces and the numbers, private exercise facilities, and the size of park and the moderate- to vigorous-activity level as well as participation for walking. Those men and women who participating regular and irregular physical activities toward vigorous intensity showed a higher level of intention for modifying their lifestyle compared to those of physically inactive (men: p<.001, F=9.448, women: p<.001, F=14.699). Men who participated in a regular physical activity showed higher level of health perception than inactive men (p<.001, F=7.809), while women who did in regular or irregular bases showed higher level of health perception than inactive women (p<.001, F=19.218). For the moderate physical activity level, men who participated in a regular physical activity showed higher perception on obesity than inactive men (p<.005, F=5.372). The intention for lifestyle modification (p<.001, F=7.509) and the health perception (p<.007, F=4.985) were higher in women of regularly active than those of inactive. The regularly active men showed higher health perception than the irregularly active men (p<.007, F=4.965). Women showed higher level of intention for lifestyle modification (p<.001, F=7.514) and health perception (p<.001, F=11.204), and perceived more slim (p<.04, F=3.215). Based on the results, the individual intention and perception toward physical activity appeared to be more influential than physical environments for participating in physical activity in community residents. Further investigation is warranted for identifying an association among the residence and the study variables.
저항운동 방법에 따른 환기량, 에너지소비량 그리고 산소섭취량의 비교
이용수(Lee Young-Soo),이승균(Lee Seung-Kyun),이상호(Lee Sang-Ho) 한국체육과학회 2002 한국체육과학회지 Vol.11 No.1
The purpose of this study was to compare ventilation, energy consumption and oxygen consumption of three resistance exercise methods(1RM-60%, gradual increase and gradual decrease) using flat bench press and to serve resistance exercise program. The subjects were 7 men who were experienced resistance exercise and college students. A repeated measure one-way ANOV A were used to evaluate test results. The results were following like this : 1. Ventilations during resistance exercise according to 3 ways(1RM 60%, gradual increase and - decrease) were not significant meaning of statistic. However, value according to gradual decrease way was high than others. It has a significant difference of .05. 2. Energy consumptions during resistance exercise according to 3 ways(1RM 60%, gradual increase and - decrease) were not significant meaning of statistic. However, value according to gradual decrease way was high than others. 3. Oxygen consumptions during resistance exercise according to 3 ways(1RM 60%, gradual increase and - decrease) were not significant meaning of statistic. However, value according to gradual decrease way was high than others.
청소년기 축구선수의 체격 및 체력 요인별 발달 연구-Ⅰ
이용수(Lee Young-Soo),하민수(Ha Min-Soo) 한국체육과학회 2000 한국체육과학회지 Vol.9 No.1
The purpose of this study was to investigate physique and physical fitness development of young soccer players for providing the valuable data to prescribe the training program. Fifty-four young soccer players(14age group=25; 17age group=29) volunteered to be measured for physique and physical fitness. 1. The growth rate of the physique variables of age 14 and age 17 were as followed, respectively; height(4.0%, 1.8%), body weight(11.3%, 8.3%), %fat(-24.1%, +2.1%), sitting height(4.0%, 1.1%), girth of chest(6.9%, 5.7%), girth of thigh(left(L): 5.5%, 6.0% and right(R): 5.4%, 5.5%), and girth of calf(L: 4.9%, 2.6% and R: 4.9%, 2.7%). 2. The rate of development in the physical fitness variables of age 14 and age 17 were as followed, respectively; 1) Power : Vertical jump(6.1%, 0.5%), Five-bounding jump(5.4%, 5.1%), 25m Hopping(L: 25.4%, 4.6% and R: 22.6%, 3.4%) 2) Agility : Side step test(2.2%, 1.2%) 3) Speed : 50m run(5.8%, 3.4%) 4) Muscular endurance : Sit-up(3.1%, 4.7%) 5) 800m run(3.4%, 4.8%) 6) Maximal oxygen uptake(5.7%, 5.4%) 7) Ventilatory threshold(decreased of 2.8% and increased of 2.2%) 8) Isokinetic strength of knee at 60°/sec(L: extensor(11.7%, 0.7%)/flexor:(21.0%, 3.4%) and (R: extensor(4.8%, 2.2%)/flexor:(5.7%, -7.4%) and 180°/sec(L: extensor(20.1%, 9.5%)/flexor:(20.8%, 5.5%) and (R: extensor(18.4%, 10.1%)/flexor:(13.1%, -2.0%) These results may suggest that physique variables except the girth of thigh, and physical fitness of isokinetic leg strength, and power are increased at age 14 and that the girth of thigh and physical fitness of endurance are increased at age 17 for one year period.