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운동선수의 체지방률과 다리 등속성 근력의 상관성 분석 : 성별 및 연령 별 비교
윤영구(Yoon, Young-Ku),이호성(Lee, Ho-Seong) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.1
The purpose of this study was to investigate the analysis of correlation between body fat rate and lower limb isokinetic strength according to gender and age differences in athletes. Data collection selected elementary (male: 268, female: 99), middle (male: 816, female: 369), high school (male: 1,076, female: 519), and adults (male: 955, female: 458) athletes. All subject were tested for body fat and lower limb isokinetic strength (left extensor: LE, left flexor: LF, right extensor: RE, right flexor: RF, left extensor and flexor ratio: LEFR, right extensor and flexor ratio: REFR, extensor of left and right ratio: ELRR, flexor of left and right ratio: FLRR). The negative (-) correlate between LE, LF, RE, RF and BF of 60°/sec and body fat in male middle/high school athletes. Also, The negative (-) correlate between LE, LF, RE, RF, LEFR and REFR of 60°/sec and body fat, and LE, RE, RF and LEFR of 180°/sec and body fat in adults athletes. The negative (-) correlate between LE, LF, RE and RF of 60°/sec and body fat, and LE, LF and RF of 180°/sec body fat in female middle school athletes. Moreover, The negative (-) correlate between LE, LF, RE, LEER, FEFR, ELRR and FLRR of 60°/sec and body fat, and LE, LF, RE, RF and REFR of 180°/sec and body fat in female high/adults school athletes, respectively. These results found that body fat rate and lower limb isokinetic strength in athletes depend on gender and age.
휘트니스센터 소비자의 성향과 소비만족 및 구매의도 간의 인과관계
윤영구(Yoon, Young-Goo) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.1
The purpose of this study was to investigate the causal relationship between propensity to consume and satisfaction with consumption and intention to purchase in the fitness center. The subjects of this study were a total of 337 for male and female members of seven fitness centers located in Seoul and Suwon. The survey questionnaires were used to collect the data. The collected material was carried out by using Spss 24.0 version and Amos 24.0 version. The questionnaires for the propensity to consume scale had been developed by Kim(1995), Kim(2018), Lee(2008) and Lee(2009), and satisfaction with consumption had been developed by Kim(2007), Yang(2005), Zo(2011), and Lee(2014), and intention to purchase had been developed by Zeithaml, Berry & Parasuraman(1996), Kim(2011), Kim(2017). From the analyses of the data, the study reached the following conclusions : The research theory 1 was partially adopted. More details, The study theory -1,Ⅰ-3 were adopted andⅠ-2,Ⅰ-4 were rejected. The research hypothesis Ⅱ was adopted. More details, Satisfaction with consumers affected the intention to purchase.
사례연구를 통한 개발도상국 민자발전사업 리스크 경감방안
윤영일,유호선,여영구,Yoon, Young-Il,Yoo, Ho-seon,Yeo, Yeong-Koo 한국플랜트학회 2013 플랜트 저널 Vol.9 No.1
This study investigates the risks that can occur during the development stage of IPP project in developing countries. In case that ECA and MLA cannot participate due to poor credit rating of the country, the diversification of power purchaser in marginal states can be a great help to reduce both market risk and country risk at the same time. In case of thermal power plants and combined cycle power plants, the effect of performance degradation as time passed will be considered and expected profit of sponsors should be maintained. Recently, developing countries are expanding IPP projects to reduce the financing cost and Korean power companies are positively participating in IPP projects. Accordingly, the loss of Korean companies should be minimized by risk management through the risk mitigation methods of this study. 본 연구에서는 개발도상국 민자발전사업의 개발단계에서 발생할 수 있는 리스크를 사업소재국, 사업주 및 시장으로 분류하여 해당 항목별 주요 리스크를 조사하고, 근래 한전 및 발전회사가 수행한 대표적인 3개 사업에 적용하여 구체적인 경감방안을 도출하고자 하였다. 개발도상국에서 민자발전사업 추진 시 전력구매처로서 신용이 부족하여 수출신용기관과 국제개발금융기구의 사업 참여가 어려운 경우, 국가신용이 양호한 주변국으로 전력판매처를 다변화하여 시장 리스크를 경감시키는 동시에 사업소재국 리스크를 경감시켜야 하며 20~30년에 걸쳐 장기간 운영해야 하는 화력발전사업의 경우 운영기간이 경과할수록 열효율도 저하되는 것을 감안하여, 설비운영 경과에 따른 성능저하 영향을 충분히 반영하여 기대수익을 보존하고 우리 기업의 손실을 최소화해야 한다.
이강일(Kang-Il Lee),윤영구(Young-Goo Yoon),이재욱(Jae-Wook Lee) 한국지반신소재학회 2013 한국지반신소재학회 논문집 Vol.12 No.1
본 연구는 포천에서 채취된 화강풍화토를 불산용액을 이용하여 인공적으로 풍화를 진행시켜서 풍화도 변화에 따른 화강풍화토의 입자파쇄 특성을 연구하였다. 이를 위해 조성광물 분석을 통한 풍화지수 결정 후, 입도분석, 표준다짐시험 및 변수위투수시험을 실시하였다. 본 연구결과는 풍화가 진행되면서 전체입경분포에서 입자파쇄가 진행되었으며, 입경 D<sub>10</sub>과 D<sub>50</sub>에 대한 비표면적을 비교한 결과 입경 D<sub>50</sub> 이하의 작은 입경분포에서 입자파쇄가 활발하게 진행된 것으로 나타났다. 또한 다짐에 의한 입자파쇄 결과는 최적함수비 부근에서 입자파쇄가 최대치를 보였고 풍화가 진행됨에 따라서 비표면적 증분비가 감소하는 것으로 보아 풍화지수가 높을수록 입자파쇄에 둔감한 것으로 나타났다. In this study, the characteristics of particle crash of decomposed granite soil sampled at Pocheon area were presented. The degree of weathering was artificially achieved by means of hydrofluoric acid. Weathering index was firstly determined by the analysis of mineral composition. Then, particle distribution, permeability tests were conducted. The results showed that weathering effects on particle crash over entire particle sizes. Comparative analysis on specific surface between D<sub>10</sub> and D<sub>50</sub> indicated that the smaller the particle size, the more the particle crash. In addition, the most particle crashing due to compaction appeared around the optimum moisture content. The incremental ratio of specific surface appeared to decrease as weathering proceeds, which means that the higher the weathering index the less the particle crash.