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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.
정적, 동적, PNF 스트레칭이 축구선수의 슬관절 등속성 근력발현에 미치는 영향
이용수(Lee Young-Soo),박종수(Park Jong-Soo),강덕모(Kang Deuk-Mo) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.3
The purpose of this study was to examine the effects of static, dynamic and proprioceptive neuromuscular facilitation(PNF) stretching on the isokinetic muscular strength of knee. Twenty male high school soccer players participated as subjects after signing informed consent forms. The isokinetic knee extension and flexion of each subject were assessed at the speeds of 60, 90, 180 and 240 deg/sec with 5 repetitions at each speed. For the comparative analysis, the changes in the isokinetic strength after static, dynaminc and PNF stretching were compared using the variables such as peak torque(PT), mean torque(MT) and time to reach the peak torque(TRP). The one way repeated measure ANOVA was performed to analyze PT, MT and TRP among three stretching methods(static, dynamic and PNF) and the post-hoc contrast(simple, repeated) test followed, if necessary. The results were as follows: There was no significant difference in peak torque during extension and flexion among the different stretching styles at the angular speed of 60, 90, and 240deg/sec. However, there was a significant difference at the speed of 180 deg/sec during both extension and flexion(p<.05). There was no significant difference in mean torque during extension and flexion among the different stretching styles at the speed of 60, 90, and 240deg/sec but there was a significant difference at the speed of 180deg/sec during flexion(p<.05). There was no significant difference during extension at the speed of 180deg/sec. There was no significant difference in time to reach the peak torque among the different stretching styles at 60, 90, 180, and 240deg/sec of extension and there was a significant difference at the speed of 60, 90, and 180deg/sec during flexion(p<.05). But, there was no significant difference during flexion at the speed of 180deg/sec. According to the results, the proper stretching style that can improve performance of soccer players with minimal loss of muscular strength seems to be combination with PNF and dynamic stretching.
운동과 홍삼 복합처치가 대장암 억제 및 예방에 미치는 영향
이용수(Lee, Young-Soo),김용래(Kim, Yong-Rae),한아름(Han, Aleum),임태홍(Lim, Tae-Hong) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.3
The purpose of this study was to identify the effect of the combined treatment of red ginseng and short and long-term exercise treatment on the inhibition and prevention of colon cancer based on the animal model. For this purpose, it attempted to divide 80 animals used here into eight groups, each composed of 10 animals, and the combined treatment for colon cancer was applied to them and the control group. They were given the treadmill exercise at the speed of about 70% of the maximum exercise for 60 minutes a day, four times a week over the periods of 6 weeks and 12 weeks. As a result, the following findings were obtained: First, an attempt was made to analyze the frequency and incidence of tumors related to the combined treatment of red ginseng and exercise. The result showed that the incidence of tumors caused by colon cancer reduced in the group of prior treatment with 6-week and 12-week red ginseng and exercise compared to the control group. Second, an attempt was made to conduct a Western blot analysis related to the combined treatment of red ginseng and exercise. The expression level of MDA was found to be lower in the group of 12-week combined treatment compared to the group of those induced by colon cancer. The expression level of 4-HNE was found to be lower in the group of those caused bycolon cancer compared to the group of 12-week combined treatment. And the expression level of HO-1 AND NQO1 was significantly higher in the group of those caused by colon cancer compared to the control group.
이용수(Lee Young-Soo),이상현(Lee Sang-Hyoun) 한국체육과학회 2000 한국체육과학회지 Vol.9 No.1
This study was aimed to compare the maximal fat oxidation exercise intensity(MFOEI) by fat percent and gender and compare heart rate(HR), respiratory exchange ratio(HER), total kilocarolies per minute(Tkcal), and fat kilocarolies per minute(Fkcal) in this exercise intensity. Forty four adult men(normal=33, over fat percent=11) and women(normal=28, over fat percent=23) healthy volunteers served as subjects after signing an informed consent form. The criterion of over fat percent was 25% fat percent and 32%, for men and women, respectively. Following an overnight fast, each subject completed stretching and tree minute warm-up at 2.0mph, followed by a maximal Ramp treadmill test. Expired gases were collected and analyzed each 30 seconds using Cosmed metabolic cart. The MFOEI was defined as the intensity which resulted in maximal Fkcal as determined by converting VO₂ to Fkcal at each treadmill stage using RER and a Lusk table. MFOEI were significantly higher women at compared men, 50.9% and 43.5% respectively(p<.05). However, except for HR, the resultant of t-test for Tkcal, Fkcal and VO₂ were significantly higher men. There was no difference in HER. MFOEI by fat percent was the highest in women obesity group which is the lowest VO₂max and the highest fat percent and the lowest in men normal group which is the highest VO₂nax and the lowest fat percent. This results suggest that MFOEI which prescribe exercise intensity to weight controll is likely to be distinguish from gender, fitness level, and fat percent.
대화형 서비스를 고려한 디스크 스케줄링의 디스크 이용률 향상 방안
이용수(Young-Soo Lee),이승원(Won-Sung Lee),김인환(In-Hwan Kim),정기동(Ki-Dong Chung) 한국정보과학회 2000 한국정보과학회 학술발표논문집 Vol.27 No.2Ⅲ
본 논문에서는 디스크의 이용률을 향상시키기 위하여 효율적인 디스크 스케줄링 알고리즘을 제안한다. 디스크 요구는 제공되는 서비스의 레벨에 따라 주기적인 요구, 비 주기적인 요구, 대화형 요구로 나눈다. 기존의 멀티미디어 서비스를 위한 디스크 스케줄링은 공정성 및 디스크 대역폭 보장만을 고려하였는데 본 논문에서는 대화형 요구를 고려하여 디스크를 스케줄링의 공정성 및 주기적인 요구의 대역폭을 보장하구 디스크 이용률을 향상시켜 처리 가능한 요구수를 증가 시킬 수 있는 디스크 스케줄링을 제안한다.
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.