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이민용,장중구,서상진,Lee, Min-Young,Chang, Choong-Koo,Suh, Sang-Jin 한국전기기술인협회 2002 電力技術人 Vol.235 No.3
저압 동력설비는 사용하는 국내 수용가 혹은 산업플랜트에서는 주로 380V 전압을 채택하고 있다. 이는 전기사업법에서 저압의경우 표준 공급전압을 110V, 220V 및 380V로 정하여 놓고 있으며 3상 4선 방식에 의하여 동일 변압기를 이용 220V와 380V로 정하여 놓고 있으며 220V와 380V를 함께 공급할 수 있다는 장점이 있기 때문인 것으로 사료된다. The selection of voltage is one of the most significant factors in the design of power system for industrial plant. It is a major factor in determining over-all system cost, flexibility, and ease of future expansioin. This paper presents the study results on the selection of economic voltage for low voltage motors.
이근철 ( Keun Chul Lee ),서상진 ( Sang Jin Suh ),이강헌 ( Kang Hun Lee ) 한국스포츠심리학회 2014 한국스포츠심리학회지 Vol.25 No.2
Purpose: The purpose of this study was to develop a stress test for students in physical education high schools and to verify the validity of the developed test. Methods: To develop the test, this study referred to the stress factors of students in physical education high schools, analyzed by Lee, Dong & Lee(2009) and designed a preliminary test with 42 questions of 7 factors. On the basis of the data of 544 students in three physical education high schools, this study conducted exploratory and confirmatory factor analyses to examine the structure and goodness-of-fit of the data, and performed reliability analysis. To verify the convergent validity of the confirmed test, it used the data of 82 students in one physical education high school. Lastly, based on the data of 626 students, it conducted factor invariance test and latent means analysis to investigate the difference between background variables. Results: It was found that the stress test for students in physical education high schools had the structure of four factors: athletic stress, conflict with teammates, coach stress, and life stress. According to the comparison between the test and other tests in terms of convergent validity, the developed test explained construct well. Factor invariance of each background variable was satisfied. According to the analysis of the difference between groups, women had more stress than men in terms of athletic stress and coach stress. The 1st year students had more conflict with teammates than the 2nd year students, and the 3rd year students had high athletic stress, coach stress and life stress.
비만도에 따른 최대지방연소를 위한 운동강도 설정에 관한 연구
서상진,박수연,박철빈 경희대학교 체육과학연구소 1999 體育學論文集 Vol.27 No.-
In order to provide the basic data required for an effective physical exercise program to get rid of obesity, women in their 20s to 50s who had never participated in a regular physical exercise were classified into GroupI, GroupII, and GroupIII consisting of 10 persons each with 25 to 30%,34 to 35%, and over 36% of body fat rate respectively, and then they were checked up with their maximum physical exercise intensity by using RAMP II protocol to analyze relations of physiological causes of change at the time of the maximum fat oxidation intensity for the three groups with the result of analysis as follows, 1.Maximum fat oxidation and fat -free weight(r=.396, p〈.03), oxygen uptake(r=.569, p〈.001) and ruts piratory exchange rate(r=.673, p〈.000) have notable co-relations one another. 2.At the time of the maximum fat oxidation intensity, oxygen uptake, heart rate, respiratory exchange rate, fat oxidation, and energy consumption among the 3 group have shown no notable statistical difference one another. 3.At the time of the maximum fat oxidation intensity, percentage in the maximum oxygen uptake value(% VO2max) shows a notable difference among the three groups. A post verification shows GroupIII has a notable difference from GroupI or GroupII(p〈.05) while there is no notable difference between GroupII and GroupI. In conclusion at the time of the maximum fat oxidation intensity, GroupIII(body fat rate of over 36%) shows a notably high relative intensity. Accordingly people of high body fat rate need the tensity of 60% VO2max in aerobic exercise to reduce their fat.