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김옥환,Kim, Oug-Whoan 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.6
본 논문에서는, 무선통신을 위한 이중대역 마이크로스트립 안테나를 설계하였다. IEEE 802.11a의 대역인 Hyper LAN(5.725~5.825GHz)에서도 사용 할 수 있도록 설계하였다. 제안된 안테나의 기판은 FR-4이고 크기는 $22mm{\times}23mm$, 두께는 1.6mm로 구성하였으며, 시뮬레이션은 CST Microwave Studio 2010을 사용하였다. 설계된 안테나의 시뮬레이션 결과 5GHz와 5.8GHz의 대역에서 공진을 나타내고 -10dB 이하에서 양호한 반사손실을 보였다. In this paper, we design of dual-band microstrip antenna for wireless communication. We used IEEE 802.11a and Hyper LAN (5.725~5.825 GHz). The proposed antenna substrate is FR-4, size is $22mm{\times}23mm$, thickness is 1.6mm and used to CST Microwave Studio 2010 program. As a result the simulation has good result and good return loss below -10 dB at 5 GHz and 5.8 bandwidth.
김영춘(Young-Choon Kim),조문택(Moon-Taek Cho),주해종(Hae-Jong Joo),김갑수(Kab-Soo Kim),김옥환(Ok-Hwan Kim),김현종(Hyun-Jong Kim) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
식물의 성장에 있어서 여러 종류의 빛 파장을 이용하여 식물 잎의 각 기관에서의 이상징후에 의한 파장의 반사/흡수 및 형광발관 등에 관한 연구가 이루어지고 있다. 본 논문에서는 가시광선 영역과 NIR 영역에 있어서 식물잎의 반사 잎을 이용하여 식물 잎의 수분함량을 포함한 스트레스 측정방법을 제안했다.
국내 성인의 신체구성과 체력의 상관관계에 대한 종단적 연구
김옥환(Kim, Ok-Hwan),이상진(Lee, Sang-Jin) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.5
This study analyzed difference and correlation between body composition and fitness level by dividing it into age-based(20s,30s,40s,50s,60s) and BMI & %BF group-based(Group,A,B,C,D) through a longitudinal study targeting 3721 men and 379 women in adults of our country, divided cardiorespiratory fitness into the low group and the normal group, and carried out logistic regression analysis. And then the following conclusions were obtained. <br/> Seeing the above results, it can be considered that the obesity-related level out of body composition continuously grows in the more increase in age and to continuously reduce following the 20s in case of fitness level. BMI, %BF were indicated to have high relationship with fitness level. BMI was indicated to have high positive correlation with muscular strength level. %BF was indicated the negative correlation in all fitness variables. Accordingly, when muscular strength is high, BMI level may be high. In evaluating obesity, BMI is judged to likely need independent analysis from other obesity-related variables. Also, what reduces weight and body fat or increases fitness can be an important means for increasing the cardiorespiratory fitness. <br/> What increases fitness level, which has negative relationship with BMI, %BF, is considered to be likely conducive to resolving obesity. Hence, based on this study, it is thought to be necessary for a continuous research on relevant variables in order to possibly analyze properly adults"; fitness level and obesity and for a specific and systematic program with the aim of managing fitness level and losing body fact according to a rise in age.
중학생의 학교스포츠클럽 참여가 학교생활적응 및 운동지속 의도에 미치는 영향
김옥환(Oh-Hwan Kim),이상진(Sang-Jin Lee) 한국발육발달학회 2019 한국발육발달학회지 Vol.27 No.4
In this study, middle school students based in Suwon City were selected as a population, using the method of extraction of convenience among non-probability labels. The conclusion obtained by asking 150 students who participated in the activities of the school sports club from April to July to agree to participate in the research is as follows. First, after looking into the effect of participating in school sports clubs on the adaptation of school life, there was a significant difference in p<0.05 in school life, and there was no significant difference between school study and school teacher. Second, after looking into the effect of participating in school sports clubs on the intention of sports, there were significant differences in p<0.05 in all trends, intensities and possibilities.
이해중심게임 수업 모형이 창의인성 및 스포츠맨십에 미치는 영향
김옥환(Kim, Ok-Hwan),김장현(Kim, Chang-Hyun),최윤동(Choi, Youn-Dong),안을섭(An, Eul-Seob),이상진(Lee, Sang-Jin) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.6
The purpose of this study was to examine the influence of P.E. instruction by a model of teaching games for understanding on the creative personality and sportsmanship of learners. The subjects in this study were 262 students in a middle school located in an urban community in Gyeonggi Province. They received P.E. instruction by applying a model of teaching games for understanding during an eight-week period of time, three times a week, 45 minutes each. The instruments used to collect data were Ha Joo-hyeon(20010’s Creative Personality Test and Sung Chang-hoon(2003)’s Sportsmanship Inventory, which were both modified to serve the purpose of the study. As for data analysis, a statistical package SPSS WIN 18.0 was employed. Statistical data on Cronbach alpha coefficients, mean and standard deviation were obtained, and paired-samples t-test was conducted. The findings of the study were as follows: First, the model of teaching games for understanding was found to have exerted a positive influence on the creative personality variable (self-conviction, endurance/obsession, curiosity and imagination) of the students. Second, the model of teaching games for understanding was found to have exercised a positive influence on the sportsmanship variable(respect for judgment, consideration for peers, respect for the opponent and approval of the result) of the student. In conclusion, well-planned guidance should be provided for students to foster their creative personality and sportsmanship while they engage in a variety of P.E. activities.
규칙적인 운동참여에 따른 청소년의 운동몰입과 심리적 웰빙의 차이
김옥환(Ok-Hwan Kim) 한국발육발달학회 2017 한국발육발달학회지 Vol.25 No.2
The purpose of this study was to offer basic data for promoting and improving health by analyzing the influence of regular exercise participation in adolescents, who are in the period of being heightened an interest in exercise and well-being, upon exercise commitment and psychological well-being. To achieve the objective of research, the research subjects were set to be 400 students at 4 high schools where are located in Suwon city. A survey tool was questionnaire and was used with comprising 4 items for individual characteristic, 8 items for exercise commitment and 20 items for psychological well-being. It classified students without congenital abnormality into 200 students for the exercise participation group and 200 students for the non-exercise participation group depending on whether or not regular exercise participation for more than 3 years at least with three times a week, and then collected immediately after conducting questionnaire through a self-assessment report method. As a result of analyzing the collected questionnaires by using SPSS Win 20.0 statistical program, they are as follows. First, the exercise commitment was indicated to be higher in the exercise group than the non-exercise group and was shown to be higher even statistically. Second, the psychological well-being showed significant difference in all the sub-factors in order of self-actualization, flow, competence and hedonic enjoyment. The exercise group was indicated to be higher than the non-exercise group and was shown to be higher even statistically. Synthesizing the above results, the regular exercise participation was shown to have positive effect on exercise commitment and psychological well-being in adolescents. Hence, habituating the regular exercise participation is considered to be very important.