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복합운동 시 L-카르니틴 섭취가 과체중 성인여성의 신체구성 및 건강관련 생리적 요인에 미치는 효과
오정헌,서태범 한국체육과학회 2023 한국체육과학회지 Vol.32 No.5
The purpose of this study was to investigate the effect of L-carnitine supplement intake before combined aerobic and resistance exercises on body composition, physical fitness, and metabolic risk factors. The subjects of this study were 18 overweight young-adult women with no exercise experience, and they were randomly divided into two groups; combined training+placebo intake group(PLA, n=9), and combined training+L-carnitine intake group(CAR, n=9). Combined training which consists of aerobic and resistance exercises was performed 3 times a week for 8 weeks. To investigate the effect, body composition, grip strength, back strength, power, muscular endurance, cardiopulmonary endurance, blood pressure, fasting blood glucose, blood lipid concentration, and waist-hip ratio were analyzed before and 8 weeks after combined training. Significant differences between group and period were determined with two-way repeated ANOVA. To summarize the results of this study, the oral intake of 2g of L-carnitine supplement with combined training significantly decreased percent body fat and significantly increased fat-free mass, but did not effect on physical fitness and metabolic risk factors. Therefore, our findings suggest scientific evidence that L-carnitine intake and combined training might be used as an ergogenic supplement to improve body composition in overweight young-adult women.
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중복된 멀티캐리어 DS-CDMA 시스템의 서브밴드 중복율 변화에 따른 성능개선에 관한 연구
오정헌,박광철,김기두,O, Jeong-Heon,Park, Gwang-Cheol,Kim, Gi-Du 대한전자공학회 2000 電子工學會論文誌-TC (Telecommunications) Vol.37 No.9
멀티캐리어 DS-CDMA는 다중경로 페이딩 채널에서 광대역 시스템의 구현에 효과적인 방법이다. 본 논문에서는 콘볼루션 코딩을 적용한 중복된 멀티캐리어 DS-CDMA 시스템을 제안하고, 중복율 변화에 대한 성능을 분석하여 정해진 서브밴드 캐리어 수에 따라 최적의 성능을 제공하는 중복율을 제시한다. 특히 전체 서브캐리어 수에 따라 최적의 성능을 제공하는 중복율을 제시한다. 특히 전체 서브캐리어 수 M*R 값이 같다면 콘볼루션 코딩율 1/M과 반복 코딩율 1/R 값에 관계없이 칩 성형필터의 rolloff인자 β값이 같으면 중복율 변화에 따른 BET의 변화 형태가 거의 동일함을 보인다. 그리고 서브밴드의 중복인자 (0<β≤2) 변화와 rolloff인자(0<β≤1)의 변화에 따른 MUI를 분석하여 기존의 멀티태리어 시스템과 성능을 비교하고, 제안한 시스템의 중복율 변화에 따른 성능 개서 정도를 보인다. Multicarrier DS-CDMA is an effective approach to realize wideband CDMA system in a multipath fading channel. In this paper, we propose a convolutionally-coded overlapped multicarrier DS-CDMA system, and analyze the performance with subband overlapping variation to determine the overlapping percentage showing best performance. Given a total number of subcarriers M*R, we will show that the BER variation is highly dependent on the rolloff factor P of raised-cosine chip wave-shaping filter irrespective of convolutional encoding rate I/M and repetition coding rate 1/R. We also analyze the possibility of reduction in total MUI by considering both variation of a rolloff factor (0 ($\beta$ :1) and variation of subband overlapping factor (0 ( A :2), and show that the proposed system may outperform the multicarrier DS-CDMA system in [1, 12].
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다중경로 페이딩 채널에서 콘볼루션 채널코딩을 적용한 중복된 멀티캐리어 DS-CDMA 시스템에 관한 연구
오정헌,황용남,염정원,김기두,Oh, Jung-Hun,Hwang, Yong-Nam,Youm, Joeng-Won,Kim, Ki-Doo 대한전자공학회 2000 電子工學會論文誌-TC (Telecommunications) Vol.37 No.1
멀티캐리어 DS-CDMA는 다중경로 페이딩 채널에서 광대역 시스템의 구현에 효과적인 방법이다. 본 논문에서는 콘볼류션 코딩을 적용한 중복된 멀티캐리어 DS-CDMA 시스템을 제안하고, 기존의 멀티캐리어 시스템과 비교하여 성능의 우수성을 입증한다. 제안된 멀티캐리어 DS-CDMA 시스템을 분할된 각 서브밴드를 가용주파수 대역 내에서 보다 효율적으로 구성하기 위하여 50% 중복 (overlapping) 된 구조를 갖도록 한다. 그리고 전송률이 1/M인 콘볼루션 채널코딩과 반복율이 1/R인 반복코딩을 적용하여 채널 코딩에 의한 이득과 주파수 다이버시티 (frequency diversity) 효과를 동시에 획득하고, 또한 MUI(Multiple User Interference)를 효과적으로 감소시키기 위하여 각 서브밴드의 확산신호에 raised-cosine 칩 성형필터를 적용하였다. 사용된 칩 성형필터의 rolloff 인자 (0< ${\beta}{\le}1$)의 변화에 따른 MUI를 분석하여 기존의 멀티캐리어 시스템의 성능보다 우수함을 보인다. Multicarrier DS-CDAM is an effective approach to realize wideband CDMA system in a multipath fading channeal. In this paper, we propose a cinvolutionally-coded overlapped multicarrier DS-CDMA system, and show the performance improvement by comparing with conventional multicarrier DS-CDMA system. We consider the case of 50% overlapping with the adjacent subband to utilize the transmission bandwidth more efficiently. In the proposed multicarrier system, each of the rate 1/M convolutionally-encoded symbols is also 1/R repetition coded and transmitted using overlapped multicarriers and we may obtain the coding gain and frequency diversity effect, simultaneously. We also analyze the possibility of reduction in total MUI by considering a raised-cosine wave-shaping filter having a roll-off factor (0< ${\beta}{\le}1$). It will be shown that the proposed system outperforms the multicarrier DS-CDMA system in $^{[3]}$.
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오정헌(Jeong Heon Oh),엄인섭(In Sup Um),박춘수(Choon Soo Park),이희성(Hi Sung Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
This paper presents a simulation-based optimal design method for the design of the train depot. Because the train depot is composed of each subsystems such as car body and wheel workshop, the train is divided into car, car body and wheel for the process analysis and we design the simulation model. In simulation analysis, we consider the dependent variables and independent parameters. Therefore, the Multi Criteria Decision Making (MCDM) is used for selecting the alternatives and simulation optimization is proposed for finding the optimal design parameters of the selected alternative by using evolution strategy. The case study for the above design process is applied to the KTX-Ⅱ(High-Speed Railway) Train Depot. This paper provides a general design and analysis framework for the train depot design with using the simulation.
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고관절 외전 각도가 리버스 하이퍼 익스텐션 운동 시 근활성도에 미치는 영향
오정헌(Oh, Jeong-Heon),한누리(Han, Nu-Ri),서태범(Seo, Tae-Beom) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.6
The purpose of this study was to investigate whether different hip abduction angles might alternate hip extensor muscle activity in reverse hyperextension (RHE) exercise. Fourteen healthy male subjects performed RHE in 4 hip abduction angles (-10°, 0°, 15°, and 30°). Muscle activities of longissimus, gluteus maximus, gluteus medius, biceps femoris, semitendinosus, and adductor magnus were measured by surface electromyography device. One-way repeated ANOVA was used to analyze the results from each angle of muscle and the ratio of muscle activation. During the concentric phase of RHE, gluteus medius activation was greater at 15° and 30° of hip abduction angles (p<.001) than at -10 and 0°, while biceps femoris was greatest at -10° (p<.001) followed by 0°, 15°, and 30° of hip abduction angles. During the eccentric phase of RHE, gluteus medius activation was greater at 15° and 30° of hip abduction angles (p<.003) than -10°, while biceps femoris was greatest at -10° (p<.001) followed by 15° and 30°. Our findings suggest that RHE of hip abduction at 15° and 30° might be the most appropriate angle for maximizing gluteal muscle activation.
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오정헌 ( Oh Jung Hun ) 한국청소년학회 2023 청소년학연구 Vol.30 No.2
본 연구의 목적은 청소년기의 종교활동 경험의 의미와 삶의 변화를 경험을 심층적으로 살펴보는 것이다. 연구방법은 청소년기 가톨릭 종교활동을 경험했던 종교활동 지도자 7인을 대상으로 질적 면담을 통해, 청소년이 느끼는 종교활동의 영향과 의미는 무엇이며 그 영향으로 변화하는 삶의 모습을 조사하고 분석하였다. 분석 결과 총 3개의 주제, 9개의 범주, 12개의 의미 단위가 도출되었다. 첫 번째 주제는 '종교활동의 시작'으로 해당 범주는 '부모의 종교성향의 영향' , '종교활동에 대한 지지'가 도출되었다. 두 번째 주제는 '청소년기 종교활동의 의미와 인식변화'이다. 해당 범주는 '종교활동 경험의 인식' , '종교활동의 긍정적 영향과 인식변화' , '종교활동과 영성'이 도출되었다. 마지막 주제는 '청소년 종교활동의 영향과 삶의 변화'이다. 해당 범주는 '종교활동의 지속성' , '청소년 종교활동의 역할' , '삶의 변화'로 도출되었다. 연구결과를 통해 청소년기의 종교활동의 긍정적 영향과 삶의 변화요인을 해석함으로써 청소년정책과 청소년 지원체계 구축에 실천적 함의를 제안하였다. This study aims to look at the meanings of religious activity in adolescence and life-changing experiences in depth. The research method is qualitative interviews targeting seven religious leaders who went through catholic religious activities in their adolescent period. The researcher investigated the effects of religious activities on teenagers and how meaningful they are, and how their life changed by these activities. The research analysis drew three themes, nine categories, and twelve keywords for meanings. The first theme is what brings them to start religious activities, and this category drew the effects on parents' religious attitudes and support for religious activities. The second theme is the meanings of religious activities in adolescence and changed perspectives on religious activities. In this category are perceptions of the experience of religious activities and positive effects and changed attitudes toward religious activities. The last theme was the effects of religious activities on adolescence and life changes. In this category, consistent engagement in religious activities, the roles of religious activities in adolescence, and life changes were drawn. Research implications suggest practical significance in youth policy and support systems by interpreting the positive effects of religious activities on adolescents and life-changing factors.
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