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이정혜,안견,정의상,정태영,Jung-Hye Lee,MD,Kyeon Ahn,MD,Eui-Sang Chung,MD,PhD,Tae-Young Chung,MD,PhD 대한안과학회 2010 대한안과학회지 Vol.51 No.9
Purpose: To determine predictable factors of postoperative pain and cut-off values following LASEK eye surgery. Methods: Thirty-three eyes of 17 patients who underwent LASEK from May to December 2008 were reviewed. For evaluation of predictive factors, patients’ anxiety level was converted to APAIS, HADS, STAI, and VAS preoperatively. Substance P and prostaglandin E2 levels in tears, blood pressure, heart rate, and history of any previous surgery were determined before the procedure. Thirty minutes and 1 day after LASEK, the subjective degree of pain was scored. Results: Patients with high Amsterdam preoperative anxiety scale (APAIS) and Visual analogue scale (VAS) scores showed more postoperative pain (p=0.04, p<0.001). Higher substance P and prostaglandin E2 levels were significantly related with more severe pain after LASEK (p<0.001, p<0.001). Postoperative pain increased significantly, according to cut-off values (p<0.05), APAIS and VAS scores greater than 6, substance P greater than 631.84 pg/ml, and prostaglandin E2 greater than 783.90 pg/ml. Conclusions: The level of pain after LASEK surgery varies individually, and many factors, including physical and psychological variances, can affect the pain. With higher APAIS/VAS scores and higher concentrations of substance P, prostaglandin E2 portends more severe pain following LASEK. J Korean Ophthalmol Soc 2010;51(9):1203-1209
급냉각기간에서 멤브레인형 LNGC의 분무냉각 열해석에 관한 연구
이정혜,김경근,노승탁,정한식,김성규,Lee, Jung-Hye,Kim, Kyung-Kue,Ro, Sung-Tack,Chung, Han-Shik,Kim, Seong-Gyu 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.1
The present paper is concerned to the thermal analysis during the cool-down period of 138,000 m$^3$class GTT MARK-III membrane type LNG carrier servicing with LNG from the Middle East to Korea. It is the cool-down period that cools the insulation wall and the gas in LNG tank to avoid the thermal shock as the start of loading of -162$^{\circ}C$ LNG. For six hours of the standard cool-down period, the temperature of NG falls down from -4$0^{\circ}C$ to -13$0^{\circ}C$ and especially the mean temperature of the 1st barrier in the top side insulation wall falls down from -38.38$^{\circ}C$ to -122.42$^{\circ}C$ in case of IMO design condition. By the 3-D numerical calculation about the cargo tank and the cofferdam, the temperature variation in hulls and insulations is precisely predicted in this paper. And the mean temperature variation of gas is calculated as the function of the spraying rate by the heat balance model during the cool-down period.
급냉각기간에서 IMO설계조건과 USCG 설계조건에 대한 LMGC 화물탱크의 열해석 비교
이정혜,Lee, Jung-Hye 대한기계학회 2004 大韓機械學會論文集B Vol.28 No.11
This study is concerned with the thermal analysis during the cool-down period of 135,000㎥ class GT-96 membrane type LNG carrier under IMO and USCG design condition. During the cool-down period, the spraying rate for the NG cooling decreases as the temperature of NG falls down from -4$0^{\circ}C$ to -l3$0^{\circ}C$, and the spraying rate for the cooling of the insulation wall increases as the temperature gradient of the insulation wall is large. It was confirmed that there existed the largest temperature decrease at the first barrier and the first insulation, which are among the insulation wall, especially in the top side of the insulation wall under IMO and USCG design condition. Also, as the NG temperature distribution is fixed, the outer temperature condition under the design condition has influence on the temperature variation at the insulation. By the 3-D numerical calculation about the cargo tank and the cofferdam during the cool-down period, the temperature variation in hulls and insulations is precisely predicted under IMO and USCG design condition. From the comparison between two conditions; IMO design condition shows more severe temperature gradient than USCG design condition, therefore, it provides the conservative estimation of the BOG.
Markov Blanket Feature Selection for Classification
Jung-Hye Lee(이정혜),Chi-Hyuck Jun(전치혁) 대한산업공학회 2013 대한산업공학회 추계학술대회논문집 Vol.2013 No.11
When the dimensionality is very large, exponential growth in the amount of the data is required for a classification task. Thus, reducing the dimensionality of the data is essential, and it can often bring the better performance. As one of dimension reduction techniques, Markov blanket can be considered as a filter method which is the minimal variable set to explain the target variable. We apply Markov blanket feature selection for categorical data, and then compare it with other feature selection methods using well-known classifiers. We successfully show the out performance of Markov blanket feature selection method. In addition, by implementing several Markov blanket induction algorithms also, we point out the performance of each Markov blanket algorithm depending on data.
이정혜(Jung-Hye Lee),곽희종(Heejong Kwag) 한국주택학회 2022 주택연구 Vol.30 No.4
본 연구는 청년 가구가 낮은 주거 안정성을 보임에도 정부에서 공급 중인 청년 맞춤형 공공임대주택의 입주율 미달이 발생하는 원인을 청년 가구의 수요와 정부의 공급정책 간의 불균형으로 보고, 전국 1,000명의 청년 가구주를 대상으로 설문조사를 진행하여 공공임대주택의 입주의향에 미치는 요인을 실증분석하였으며, 주요 연구의 결과와 시사점은 다음과 같다. 설문결과의 로지스틱 회귀모형 분석결과, 청년 가구주의 공공임대주택 입주의향과 가구 및 주거특성, 지역별 주택특성, 공공임대주택 특성은 유의하였다. 요인별로 가구 및 주거 특성은 주택면적ㆍ가구주 소득ㆍ월 주거비가 유의하였고, 지역별 주택특성은 40㎡ 이하의 주택비율, 종합전세지수가 유의한 것으로 나타났으며, 공공임대주택 특성은 주택규모, 임대료, 거주기간이 유의하였다. 특히, 선행연구들에서 연구가 미미했던 공공임대주택 특성과 입주의향 간의 유의성이 높게 나타나 주택규모, 임대료, 거주기간 등에 대한 정책적 고려가 중요하였다. 연구의 시사점은 첫째, 수요와 공급측면에서 정부가 추진 중인 청년 가구의 소득기준 확대정책의 실효성을 위해서는 주택면적, 내부시설 등 주택의 질적측면의 개선이 필요하며, 둘째, 청년 공공임대주택의 지역별 공급물량에 대한 정책 수립 시, 민간임대주택 시장의 소형 주택물량과 전세 값 상승 폭에 대한 사전 조사 후 공급 시기와 물량을 차등적으로 결정할 필요가 있다. 셋째, 청년 가구의 삶의 질 향상 및 주거 불안 완화를 위해 주택면적, 분양전환 기준 등 공공임대주택 특성에 대한 적극적 개선이 필요하며 특히, 회가 주거기준을 개선하되 공용공간의 효율적 공급으로 주거비 부담을 완화하는 정책 방향이 요구된다. 마지막으로, 출ㆍ퇴근이 양호하며 대중교통이 편리한 도심권을 선호하는 청년계층의 특성을 고려하여 도시재생사업과 연계를 통한 청년주택의 공급을 활성화할 필요가 있다. This study empirically analyzed the factors affecting youth householders’ move-in into public rental housing assuming its cause of low occupancy as an imbalance between the demand and the government’s supply policies. The result shows the move-in intention into public rental housing by youth householders and household characteristics, housing by region, and public rental housing were significant. For the housing, the house size, household income, and housing expenses were significant. For the housing by region, the housing rate of houses less than 40㎡ and the comprehensive Jeonse price index were significant. The public rental houses, the size of houses, rental fees, and residence period were also significant. In particular, the characteristics of public rental houses were highly significant, which were not fully examined in the previous studies. The study's implications are as follows. First, for the policy to effectively expand income standards for young households, the quality of housing must be improved as well. Second, a preliminary inspection of the number of small private houses and the increase in Jeonse prices are needed when supplying public rental housing to each region. Third, there should be affirmative actions to improve housing policies related to housing space, residence period, and standards for conversion into rental housing. In particular, minimum housing standards should be improved, but the burden of housing fees should be alleviated. Lastly, the supply of urban houses needs to be revitalized.
GT-96 멤브레인형 LNGC의 급냉각기간에서의 열해석
이정혜(Jung-Hye Lee),최현규(Hyun-Kue Choi),최순호(Soon-Ho Choi),오철(Cheol Oh),김명환(Myoung-hwan Kim),김경근(Kyung-Kun Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This study is concerned with the thermal analysis during the cool-down period of 135,000 ㎥ class GT-96 membrane type LNG carrier under IMO design condition. The cool-down is performed to cool the insulation wall and the natural gas in cargo tank for six hours 10 avoid the thermal shock at the start of loading of -163 ℃ LNG. During the cool-down period, the spraying rate for the NG cooling decreases as the temperature of NG falls down from -40℃ to -130℃ and the spraying rate for the insulation wall cooling increases as the temperature gradient of the insulation wall is large. It was confirmed that there existed the largest temperature decrease at the 1st barrier and lst insulation, which are among the insulation wall, especially in the top side of the insulation wall. By the 3-D numerical calculation about the cargo tank and the cofferdam during the cool-down period. the temperature variation in hulls and insulations is precisely predicted.