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교류전기철도 레일전위 저감을 위한 통합접지시스템의 횡단접속선 설치기준에 관한 연구
오승현,창상훈 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.11
The aim of this study was to analyze the standards for installing cross-connection lines in the integrated grounding system of AC electric railways in South Korea and to suggest alternatives. Unlike general electricity supply devices, in an electric railway, several kiloamps of operating current flow through the tracks, so direct contact with the human body should be avoided. When a line-to-ground fault or a short circuit occurs, a fault current flows to the track or the ground, causing a potential difference inside and around the electrical equipment, which is a risk for human safety or insulation of the equipment. To prepare for these risks, the AC electric railway uses an integrated grounding method. The amount of rail potential change according to the LTI (Liaison Transversale Integrate) interval in the integrated grounding method shall be analyzed and verified as conforming to KSC IEC62128-1 standard.
스포츠 참가 경험의 질적 도약의 계기로서 교양체육의 역할과 의미
오승현 한국체육학회 2023 한국체육학회지 Vol.62 No.5
This study analyzed the fact that physical education as liberal arts at universities acted as an important opportunity for a qualitative leap for participants in the context of sports participation. This study qualitatively analyzed the tasks of students who participated in the physical education as liberal arts classes at A University located in the metropolitan area. The results of the study are as follows. First, participants remember the experience of participating in sports in their middle and high school days and recognize physical education as liberal arts as an opportunity to experience self-overcoming. Second, the experience of participating in physical education as liberal arts allows the meaning of sports to be interpreted existentially. Third, liberal arts education makes sports intrinsically accessible and helps to construct competence. The discussion is as follows. First, physical education as liberal arts solves the problem of career interruption in sports participation, concludes the experience of participating in sports in the past, and makes it possible to participate in high-quality sports in the future. Second, physical education as liberal arts play a positive role in cultivating humanistic character and practical competence. Lastly, it was suggested that theoretical research to find the role and legitimacy of physical education as liberal arts and research on teaching and learning methodologies suitable for the purpose of liberal arts were needed.
오승현,김현태,신터전,현홍근,김영재,김정욱,장기택,송지수 대한소아치과학회 2022 大韓小兒齒科學會誌 Vol.49 No.4
This study aims to analyze the color distribution of maxillary permanent incisors in Korean pediatric patients and determine the effects of age and root developmental stage on tooth color. The L*a*b* values of 404 sound and fully erupted maxillary incisors without dental caries, restorations, trauma history or discoloration from 101 Korean patients between ages 7 and 15, with a mean age 10.0 ± 1.5, were analyzed with a spectrophotometer. CIE L*a*b* values were 84.01, 0.17, and 24.07 in maxillary central incisors, and 82.33, 0.31, and 25.99 in maxillary lateral incisors. L* values of maxillary central incisors were higher, and b* values of maxillary central incisors were lower than those of maxillary lateral incisors (p < 0.001). The color differences among the subregions exceeded the clinical perceptibility threshold in both of the maxillary central and lateral incisors. L* value for children at age 10 and younger was 84.13 in maxillary central incisors and 84.04 in maxillary lateral incisors, and those of older patients were 80.62 and 80.56, respectively. L* value of maxillary incisors of children at age 10 and younger was significantly higher than that of older patients. The root developmental stage did not affect tooth color. This study suggests that the color differences between maxillary central and lateral incisors and among the subregions of a tooth and the effects of age should be considered for aesthetic restorations of permanent incisors in pediatric patients.
오승현,김정헌,김지혜,김혜은,송승용 대한미용성형외과학회 2013 Archives of Aesthetic Plastic Surgery Vol.19 No.1
Today, adipose tissue derived mesenchymal stem cells (ADSC) have gained a great interest in various medical fields due to the characteristics of its self-renewal and multilineage differentiation capacity. The stromal vascular fraction (SVF) of adipose tissue is known to contain mesenchymal stem cells and it is obtained by processing the lipoaspirate which is usually collected from tumescent liposuction. In this study,we reviewed the records of patient epidemiology and results of SVF isolation. 30 patients (8 males and 22females) had been underwent tumescent liposuction between April 2012 and January 2013, and the collected lipoaspirates were processed to isolate SVF in GMP facility in CHA Bundang Medical Center. The average stem cell count per 1 cc of lipoaspirate was 52,252 ± 26,704 and cell count including red blood cells per 1cc of lipoaspirate was 970,607 ± 873,436. The stem cell viability was proven to be 84 ± 4%. Bacteria were not detected in all the SVF samples. Compared to previous reports concerning the yield of SVF, our results coincide well with the results of previous studies. Because there were no domestic report about the yield and viability of SVF, this report may provide a reference value of the Korean SVF for the clinicians who want to use SVF as a therapeutic purpose.
오승현 서울여자대학교 사회과학연구소 2013 사회과학논총 Vol.20 No.-
본 연구는 Lee and Swaminathan(2000, LS)이 제안한 거래량 기반 모멘텀 현상이 우리나라 주식시장의 일간 수익률에서 발견되는지를 살펴보았다. 주가지수 수익률을 대상으로 조사한 결과 LS에서 제시된 형태의 거래량 기반 모멘텀 현상은 발견되지 않았다. 그러나 거래량이 증가하고 수익률이 감소하였을 경우를 제외한 시장상황에서는 모멘텀 현상이 존재하는 것으로 확인되었다. 비동시적 거래의 영향을 받지 않는 주가지수선물 수익률을 조사한 결과, 거래량과 수익률이 감소한 시장상황에서 모멘텀 현상이 관측되었고, 그 이외의 경우에는 모멘텀 현상이 거의 관측되지 않았다. 이러한 결과는 LS가 제안한 거래규모에 근거한 모멘텀 현상과는 차이가 있으나, 일종의 거래규모 조건부 모멘텀 현상이 존재함을 의미한다. 이러한 현상의 발생원인과 이 현상을 이용한 투자전략의 실용화 가능성을 살펴보기 위해서 추후의 연구가 필요하다. This study investigates whether the volume based momentum effects suggested by Lee and Swaminathan(2000, LS) can be found in Korean stock market. Using daily stock return data, the volume based momentum effects in the form of LS have not been found in Korea. But except the market situation of increasing volume and decreasing return, it is found that there are strong momentum effects in the Korean stock index(KOSPI). To avoid the spurious momentum effects of unsynchronous trading on stock index, the returns of stock index futures are employed. In the case of futures market, momentum effects are observed only when the volume and returns are decreased. Although this result is different from the volume based momentum effects of LS, the result can be regarded as some kind of volume based momentum effects.