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신혜수(Hae-Soo Shin),전준민(Jun-Min Jeon),김윤신(Yoon-Shin Kim) 한국실내환경학회 2011 한국실내환경학회지 Vol.8 No.2
This study was performed in the 175 selected child-care facilities in the urban area (Seoul, Suwon, Daejeon, and Busan) and the industrial complex area (Sihwa and Yeosu) to measure of the characteristics of VOCs in the indoor air from August, 2007 to April, 2008. All samples were collected at the indoor and outdoor places to the child-care facilities in spring, summer, and winter seasons using the Tenex absorption trap and were analyzed through the GC/MSD. The mean concentration of VOCs in the 175 child-card facilities showed the highest levels of 73.68 ㎍/㎥ in the toluene and the lowest levels of 0.28 ㎍/㎥ in the chlorobenzene. In the concentration of the TVOC, it exceeded 2.5 times more as the indoor air quality guideline in Korea. The result of this study was found that the concentration of VOCs in the child-care facilities in Korea may influenced from the some factors such as the constructional period, traffic density, and ventilation rate. These findings may expected to imply that effective risk management strategies should be applied to minimize the public health effects for children in the child-care facilities in Korea.
부분 AUC와 VUS를 최대화하는 선형결합 스코어에 대한 최적분류점 구간
홍종선(Chong Sun Hong),전해선(Hae Seon Jeon),신혜수(Hye Soo Shin) 한국데이터정보과학회 2019 한국데이터정보과학회지 Vol.30 No.4
현실적인 분류모형에서 스코어 확률변수의 선형결합으로 표현되는 ROC 곡선 또는 곡면에서 AUC (area under the ROC curve) 또는 VUS (volume under the ROC surface)를 최대화하는 선형계수를 추정하는 방법과 특정 구간의 부분 AUC를 최대화하는 선형계수를 추정하는 방법에 관한 많은 연구문헌이 있다. 본 연구에서는 동일한 구간 폭을 갖는 다른 부분 AUC들과 비교할 수 있는 표준화된 부분 AUC 통계량을 제안하고, 이를 바탕으로 판별력이 높은 구간에서의 선형계수를 추정하는 대안적인 부분 AUC 접근방법을 제안한다. 그리고 ROC 곡면의 부분 VUS 접근방법으로 확장하고, 판별력이 가장 높은 구간에 최적의 두 분류점이 존재함을 탐색한다. For the ROC curve and surface expressed as linear combination score random variables in realistic classification models, there are many research literature estimating linear coefficients to maximize the AUC (area under the ROC curve), VUS (volume under the ROC surface) and pAUC (partial AUC) for a certain interval. In this paper, a standardized pAUC statistic is proposed to compare of other pAUCs which have the same length of intervals, so that an alternative pAUC approach method can be developed to estimate the linear coefficients corresponding to the interval with high discriminant power. The partial VUS approach method is extended to ROC surfaces for estimating the linear coefficient. Moreover, it is found that the optimal thresholds are included in these intervals obtained by these methods.
서병량(Byeong-Ryang Seo),정만호(Man-Ho Jeong),전준민(Jun-Min Jeon),신혜수(Hae-Soo Shin) 한국실내환경학회 2006 한국실내환경학회지 Vol.3 No.2
The purpose of this study was to investigate the concentration of aldehydes from new apartments in three cities(Suncheon, Yeosu, and Gwangyang) of Chonnam region. The target apartments were within 3 months after the completion of construction. Aldehydes were sampled using 2,4-DNPH cartridge and analyzed by HPLC. Temperature and relative humidity were monitored continuously every one minute by digital temperature and hygrometer. As the concentration ratio of formaldehyde between back-up and front cartridge was 3.94 ~ 6.97%, the 2,4-DNPH cartridge method satisfied a breakthrough problem for the sample collection. The repeatability of retention time and peak area for HPLC were excellent as 0.5 and 1.5%, respectively. The upper floor of S apartment (16 pyong) showed the highest concentration of formaldehyde as 1,093㎍/㎥. The average concentration of formaldehyde was the highest in K apartment(52 pyong) as 1,045㎍/㎥. The average concentration of formaldehyde in S apartment(16 pyong) and C apartment(25 pyong) were 872.6㎍/㎥ and 737.5㎍/㎥, respectively. The I/O ratios of formaldehyde were 56.9~60.0(mean : 59.1), 37.9~43.3(mean : 39.8) and 18.3~29.3(mean : 23.3) in K, C and S apartment, respectively. Therefore, it is believed that the indoor concentration of formaldehyde was very serious in new apartment. From these results, it is important that building material which emit low indoor pollutant should be selected for new apartments. In addition, management program for indoor air, such as using an adequate amount of adhesives, should be considered and indoor optimum condition should be maintained in new apartments.
신혜수,전준민 漢陽大學校 環境 및 産業醫學硏究所 1997 環境과 産業醫學 Vol.6 No.1
This study considered that characteristics of lead concentration levels and relations of the meteorological parameter(rainfall) and hard-coal consumptions from the data measured 4 air quality continuous monitoring stations during 5 years, from 1991 to 1995 in Kwangju area. The lead concentration levels showed decreasing trend yearly. but lead levels have not significantly changed from 1993 on , when prohibited completely leaded gasoline consumptions. The seasonal variation of lead concentration levels varied significantly that low in summer and high in winter. The parameters affecting lead concentration level were rainfall and hard-coal consumptions, including lead-free gasoline size.
이도우,신혜수,김윤신,이종락,김신도,김기영,이주상 漢陽大學校 環境 및 産業醫學硏究所 1993 環境과 産業醫學 Vol.3 No.1
An investigation was carried out to obtain the basic information of working environments and health condition of workers in nine leather industries during June-October 1993. The mean concentrations of dust were below the standard in all measured industries, whereas the mean concentrations of toluene, M.E.K., and other volatile organic compounds in several industries exceeded each TLV. more that 50% of workers complained in 'headache' and 'stomachache' which might be related to working condition. In geneal, education and regulation policy in leather industries should be mire strictly controlled since working environment seemed not to be good condition.