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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.
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우리나라 해운기업의 운전자본관리와 수익성과의 관계에 관한 실증연구
이성윤,Sung-Yhun Lee 한국항해항만학회 2015 한국항해항만학회지 Vol.39 No.3
기업의 운전자본관리는 단기재무전략관리 차원에서 접근이 가능하며, 이는 기업의 유동성 및 수익성 등에 영향관계가 있음이 실증 되고 있다. 따라서 효율적인 운전자본관리는 기업의 수익성을 증대시킬 수 있을 뿐만 아니라, 유동성 또한 개선시킬 수 있게 된다. 해운기업 의 경우 글로벌금융위기와 맞물려 수익성과 유동성에 많은 어려움을 겪었음에도 불구, 운전자본관리와 수익성에 대한 연구는 전무한 상태이 다. 이에 본 연구에서는 2004년 이후 46개 해운기업을 대상으로 운전자본관리와 수익성과의 관계를 규명함으로써 단기재무전략 수립에 유용 한 정보를 제공하고자 하였다. 연구의 결과 기존연구들과 같이 매입채무기간, 재고기간, 현금주기, 영업주기가 해운기업의 수익성 즉, 매출액 총이익률과 매출액영업이익률을 개선할 수 있는 중요한 요인인 것으로 실증되었다. 특히 매입채무신용기간과 영업주기의 증가는 수익성의 증 가를 가져오는 것으로 분석된 반면, 재고기간과 현금주기는 부(-)의 관계를 보여 이들이 줄어들 경우 수익성이 증가하는 것으로 나타났다. 매 출채권기간은 일부 모형에서 유의하였으나, 기존 연구들과는 달리 해운기업의 경우 수익성과의 관계를 설명하기에는 한계가 있는 것으로 나타났다. Many of previous studies suggested that working capital management is an important component of firm’s financial decision and efficient working capital management affects firms‘ profitability and it’s value. Recently, Korean shipping firms have been suffering from financial distress by recession of shipping economy. In this point of view, this study tries to investigate the relationship between working capital management and shipping firm’s profitability, using panel data on 46 Korean shipping firms for the period of 2004-2013. As result of panel regression, it proved that average payment period, inventory turnover, cash conversion cycle and operating cycle are significantly associated with firms profitabilities such as profit margin ratio and operating profit ratio, and the manager of shipping firm can increase firms profitability by more efficient working capital management. There are strong positive relationships between average payment period and operating cycle and firm’s profitability. These results suggest that managers can create firm’s value by increasing average payment period and operating cycle. Otherwise inventory turnover and cash conversion cycle have negative relationships with firm’s profitability. It means that managers can increase firm’s profitability by reducing these variables
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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.
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이성윤,지행옥,Lee, Seong-Yun,Ji, Haeng-Ok 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.2
The records of 67 patients who had been operated as an esophageal cancer during the period from 1973 to 1989 at the Department of Thoracic and Cardiovascular Surgery, Hanyang University Hospital were reviewed retrospectively. The results were summarized as follows ; The age ranged from 28 years old to 80 years old. The highest incidence was 5th decades, then 6th decades, and the incidence of male was 10 times as the incidence of female[M:F= 10.16: 1]. The locations were lower esophagus 44%, middle esophagus 38.8%, upper esophagus 11.9% and cervical esophagus 4.4% The frequent symptoms were dysphagia [88%], epigastric or substernal pain and discomfort [29.8%], weight loss [20.8%], and laryngeal dryness [1.4%]. The most common interval between the onset of dysphagia and admission was 2-3 months; 82% of patients was within 6 months, The cancer consisted of stage I [3%], stage II [11.9%], stage III[47.6%], and stage IV [33.7%] The resectability of cancer was 67%. The organs of substitute were stomach in 21 cases, right colon 6 cases, and jejunum in 8 CRSCS. The relation between invasion of tumor and lymph node metastasis was analyzed: mucosal involvement: 1 case/2case, muscle invasion; 0/2 full thickness; 4/6, adjacent structure 7/12. Postoperative complications were pneumonia, pleural effusion, hoarseness, mediastinitis, anastomosis site leakage, reoperation due to stenosis, chylothorax, empyema, mechanical ileus, wound infection, meat impaction at anastomosis site, and repair of gastrostomy site leakage. Adjuvant therapies were irradiation [15cases], chemotherapy [14cases], and Bougie dilatation [4 cases],
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이성윤 대한흉부심장혈관외과학회 1990 Journal of Chest Surgery (J Chest Surg) Vol.23 No.4
The complicated pulmonary emphysema including “Giant bullae” and spontaneous pneumothorax often involve both lungs, and controversy exists concerning which is the more rational means of surgical treatment-bilateral simultaneous operation or two staged operation. We report three cases of the complicated bilateral bullous emphysema and two cases of bilateral spontaneous pneumothorax treated through median sternotomy. We performed the ligation of bullae, bullectomy, cystectomy, wedge resection, and left lower lobectomy through median sternotomy. No technical problems were encountered through this approach, which provided maximum benefit with one operation In conclusions, median sternotomy may be appropriate for resection of emphysematous bullae, specially in a severe COPD patient who may be poorly tolerated the superimposed loss of respiratory function due to incisional pain, because median sternotomy permit bilateral exploration, minimal impairment of pulmonary function, simultaneous restoration of pulmonary function, less incisional pain than routine lateral thoracotomy.
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이성윤,김휘은,조윌렴,김영환,유상임 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.6
We report the greatly improved dielectric properties of CaCu3Ti4O12 (CCTO) films with a 60 nm-thick CaTiO3 (CTO) interlayer on Pt/TiO2/ SiO2/Si substrates. Both CCTO films and CTO interlayers were prepared by pulsed laser deposition (PLD). With increasing the thickness of CCTO from 200 nm to 1.3 μm, the dielectric constants (εr) at 10 kHz in both CCTO single-layered and CCTO/CTO double-layered films increased from ~260 to ~6000 and from ~630 to ~3700, respectively. Compared with CCTO single-layered films, CCTO/CTO double-layered films irrespective of CCTO film thickness exhibited a remarkable decrease in their dielectric losses (tanδ) (<0.1 at the frequency region of 1 - 100 kHz) and highly reduced leakage current density at room temperature. The reduced leakage currents in CCTO/ CTO double-layered films are attributable to relatively higher trap ionization energies in the Poole-Frenkel conduction model.
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