最適化 技法에 의한 南江-安東댐의 洪水調節

李成允,金勝權 외 1인 空軍士官學校 1988 論文集 Vol.25 No.-

The use of an Incremental Dynamic Programming(IDP) for real-time flood control operation is investigated. The optimization model has been applied for the Namgang and Andong hypothetical flood control system in the Nakdong river basin. The objective of the operation is defined to minimize the maximum flow at the confluense of downstreams from the two reservoirs. The results are compared to the direct summation of the flood routing results from individual flood control simulation run. It shows that peak flow at the confluence is reduced markedly by reducing peak outflows from individual reservoirs and by balancing the time of the peak release between the two reservoirs.

Cycling characteristics of PVdF-HFP/Celluose acetate blend polymer membranes for Lithium battery

이성윤,홍진후,김현경 한국고분자학회 2013 한국고분자학회 학술대회 연구논문 초록집 Vol.2013 No.4

Relationship between Maternal Serum C-Reactive Protein, Funisitis and Early-Onset Neonatal Sepsis

이성윤,박교훈,Eun Ha Jeong,오경준,류애리,박경운 대한의학회 2012 Journal of Korean medical science Vol.27 No.6

The aim of this study was to determine whether maternal serum C-reactive protein (CRP) is of value in predicting funisitis and early-onset neonatal sepsis (EONS) in women with preterm labor or preterm premature rupture of membranes (PROM). This retrospective cohort study included 306 consecutive women with preterm labor or preterm PROM who delivered preterm singleton neonates (23-35 weeks gestation) within 72 hr of CRP measurement. The CRP level was measured with a highly sensitive immunoassay. The sensitivity, specificity, positive predictive value, and negative predictive value of an elevated serum CRP level (≥ 8 mg/L) were 74.1%, 67.5%, 32.8%, and 92.4% for funisitis,and 67.7%, 63.3%, 17.2%, and 94.6% for EONS, respectively. Logistic regression analysis demonstrated that elevated levels of serum CRP were significantly associated with funisitis and EONS, even after adjusting gestational age. The maternal serum CRP level obtained up to 72 hr before delivery is an independent predictor of funisitis and EONS in women with preterm labor or preterm PROM. A low serum CRP level (< 8 mg/L) has good negative predictive value in excluding funisitis and EONS, and may therefore be used as a noninvasive adjunct to clinical judgment to identify low-risk patients.

Intra-Amniotic Infection/Inflammation as a Risk Factor for Subsequent Ruptured Membranes after Clinically Indicated Amniocentesis in Preterm Labor

이성윤,박교훈,정은하,오경준,류애리,Ahra Kim 대한의학회 2013 Journal of Korean medical science Vol.28 No.8

The aim of this study was to determine whether intra-amniotic infection/inflammation (IAI)was associated with subsequent ruptured membranes in women with preterm labor and intact membranes who had a clinically indicated amniocentesis. This retrospective cohort study included 237 consecutive women with preterm labor (20-34.6 weeks) who underwent amniocentesis. The clinical and laboratory parameters evaluated included demographic variables, gestational age, C-reactive protein (CRP) and amniotic fluid (AF)white blood cell, interleukin-6 (IL-6) and culture results. IAI was defined as a positive AF culture and/or an elevated AF IL-6 level ( > 2.6 ng/mL). The primary outcome was ruptured membranes in the absence of active labor occurring within 48 hours of amniocentesis. Preterm premature rupture of membranes subsequently developed in 10 (4.2%) women within 48 hr of amniocentesis. Multivariate analysis demonstrated that only IAI was independently associated with the ruptured membranes occurring within 48 hr of amniocentesis. In the predictive model based on variables assessed before amniocentesis,only CRP level was retained. IAI is an independent risk factor for subsequent ruptured membranes after clinically indicated amniocentesis in preterm labor. Prior to amniocentesis,measurement of serum CRP level can provide a risk assessment for the subsequent development of ruptured membranes after the procedure.

종합군수지원(ILS) 실태진단 및 발전방안

이성윤,홍석진 한국국방연구원 2006 국방정책연구 Vol.21 No.4

우리 군은 그동안 종합군수지원(ILS)에 대한 관심 부족과 기반체계 미정립으로 ILS 소요제기의 구체화가 지연되거나 미흡하고, 적시에 적정 예산 편성이 이루어지지 못하여 다시 ILS의 부실로 이어지는 악순환이 반복되고 있다. 이러한 문제점을 개선하기 위해서는 (1) ILS 중장기 종합발전계획 수립 및 단계적 집행, (2) 관련부서간 명확한 책임한계 규명 및 사업별 책임관리체제 구현, (3) ILS 종합관리시스템 구축, (4) 무기체계 운영실적 자료의 체계적 수집, 분석 및 활용체계 구축, (5) 인력 전문화 등이 지속적으로 추진되어야 한다.

장비유지예산 진단 및 발전방향

이성윤 한국국방연구원 2007 국방정책연구 Vol.23 No.2

Appropriate maintenance budgeting and effective execution are the most important factors for the defense readiness but it has been reported that there are a lot of problems in our military maintenance system and each service faces serious lack of maintenance budget. In this study I diagnosed maintenance budgets for the previous ten years and suggested the development strategies to renovate the military maintenance system. The target of developing the maintenance system is to budget reasonably and to execute the maintenance budget effectively. So, I suggested the strategies to construct infra structure and to develop the maintenance policy for these purposes based on the results of diagnosis of the maintenance budget. 본고에서는 과거 10년간의 장비유지예산 집행 실적 분석에 기초하여 최근 제기되고 있는 우려에 대한 근본적인 문제점을 진단해 보고 향후 발전전략을 제시하였다. 장비유지사업에 대한 지난 10년간의 성과는 ‘부족한 재원으로 일정 수준의 전투준비태세를 유지해왔다’로 요약할 수 있으며, 핵심 문제점으로는 ‘초과자산과 재고고갈이 병존하며 예산부족 현상이 발생’하고 있는 것으로 진단하였다. 장비유지분야 발전목표는 적정 장비유지예산 편성 및 집행의 효율성 제고가 될 수 있으므로, 진단결과에 기초하여 장비유지예산 향후 투자 및 정책 방향을 적정 장비유지예산 편성을 위한 기반체계 구축과 장비유지 정책 개선으로 구분하여 제시하였다.

Electrochemical properties of microporous gel electrolyte composed of P(VdF) - co - HFP and cellulose

이성윤,김현경,한아름 한국고분자학회 2012 한국고분자학회 학술대회 연구논문 초록집 Vol.2012 No.4

Study on the Relationship and Validity of the Management Evaluation Factors in Public Firms With a Focus on the Port Authorities

이성윤,안기명 한국항해항만학회 2019 한국항해항만학회지 Vol.43 No.6

According to the results of the management evaluation of the nation’s public firms over the past seven years, the rating of the port corporation is generally insufficient. According to the results of the seven-year study 2011-2017, the average debt ratio of the port corporation was 34.5%, two to three times lower than that of the general public company, the operating profit ratio of sales was three times higher, and the value added per person was 1.6-1.9 times better. However, the aggregate score and grade were generally low, with 4.1% of the total number of employees of the general public corporation, 10% of the average total assets, and 1% of the average sales volume. The distributed analysis results and panel return analysis results show that the size significantly impacts the overall score and grade. Additionally, major business standards such as port volume, not controlled by the port corporation, appear to have a decisive influence on the low grade of the port corporation. Thus, it appears that improvement and supplementation of key business indicators of port construction are urgently needed in the management evaluation system, which can be properly controlled.

Modified oxygen transmission model for layer by layer self assembly film

이성윤,민수정,이준영,신교직,최경호,이상국 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

Layer by layer self-assembly (LbL-SA) film has been used as a barrier film to disturb the transmission rate of undesired materials that have a higher vapor pressure than an atmospheric pressure. Although several oxygen transmission models have been investigated to correlate the state and contents of inorganic materials such as clay with gas permeability, it is difficult to apply these equations to the LbL-SA film due to the partially condensed clay in each layer. In this study, modified composite-type model was introduced by the sum of each layer. Particularly, it was implied that not only the tortuous pathway but also the pore size and density in the clay layer can be proportioned to the oxygen transmission rate.

서울地域 百日咳에 對한 疫學的考察(第2部) : 國民學校兒童을 中心으로

李聖允 中央醫學社 1963 中央醫學 Vol.5 No.5

Subsequent epidemiological study was proceeded towards 10,364 school children of 3 ptimary schools in Seoul Area during October, 1962. Open-ended questionaire form was employed in this survey and the conclusions summarized as follows : 1. No significant difference is observed between both sexes. 2. As the age increases the incidence rate decreases and the highest is shown among under 1 year of age group. 3. The higest incidence rate of infant pertussis is observed at 3 to 6 months of age. 4. Out of children *ho were vaccinated completely, 16.3% are infected; 24.4% of the children who were vaccinated completely or under vaccinations are infected. 5. Among the siblings, 31.4% are infected concurrently and in general the seniors are infected first. 6. Less than 7% of the cases are treated by herb medicine. 7. The incidences are observed throughout the year; the highest is shown in May, the second in June and the lowest in January and December. R The nerinrlir curie is observed to he 4 years.