사회간접자본(SOC)투자 평가모형의 개발 및 응용(2단계)(Development and Application of an Evaluation Model for Infrastructure Investment (Phase 2))

노트 : 이 연구보고서의 내용은 국토연구원의 자체 연구물로서 정부의 정책이나 견해와는 상관없습니다

국가GIS 중장기 정책방향 연구(Vision and policy issues for national geographic information system in Korea)

노트 : 이 연구보고서의 내용은 국토연구원의 자체 연구물로서 정부의 정책이나 견해와는 상관없습니다

교통안전 추진체계 정비방안 연구(A study on the transportation safety system improvement plan of Korea)

노트 : 이 연구보고서의 내용은 국토연구원의 자체 연구물로서 정부의 정책이나 견해와는 상관없습니다

Double-sided folded internal pudendal artery perforator flap for the repair of a recurrent rectovaginal fistula.

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Fashionplus의 성공 :Web net Korea-최고의 패션전문 포탈서비스 사이트를 향해…

여자가 모이면 접시가 깨진다는 말은 이제 옛말이다. 깨지는 것은 접시가 아니라 바로 기업은 남성의 전유물 이라는 낡은 생각이다. 인터넷시대에 이제 남성과 여성은 없다. 1999년 9월 1일 웹넷코리아의 대표 김해련사장은 패션과 인터넷을 성공적으로 접목시켜 패션플러스 (http://www.fashionplus.co.kr)란 온라인쇼핑몰을 개설하였다. 온라인패션점 패션플러스는 개설 첫 달 만에 1억원의 매출을 올렸는가 하면, 단기간에 11만회원, 그리고 또 하루 방문자수 7-8만명, 월평균 매출이 3억원에 달하는 인터넷 선도 사이트로 주목을 받았다. 웹넷코리아는 이제 패션전문 컨텐츠 및 커뮤니티 사이트인 Fashionplus.net. 모델 네트워크 서비스인 Modelplus.net. 패션업체 B2B 사이트인 TplusF.com 등으로 사업을 확장해 나가고 있으며, 또한 한국종합기술금융 (KTB)과 산은캐피탈이 액면가의 5배정도로 10억여원을 투자유치 하는데 성공하였다. 3월에는 회원대상 인터넷 공모를 실시하여 제 3시장에 성공적으로 등록하는 등 계속적인 성장세로 주목 받는 기업으로 성장하였다

고온 표면에서 충돌 수분류에 의한 비등 열전달 : 실험 및 해석

학위논문 (박사)-- 서울대학교 대학원 공과대학 기계항공공학부, 2017. 8. 김찬중.Boiling heat transfer of subcooled water impingement on highly superheated platee is inverstigated by means of heat transfer analysis and high-definition flow visualization. The stainless-steel plate initially heated up to 900ºC by an induction heating method is cooled by water of 15ºC. The surface temperature and heat flux are estimated by solving 2-D inverse heat conduction problem. The temporal visualization during quench subcooled-jet impingement boiling is synchronized with the heat transfer measurement in the corresponding surface temperature and heat flux. Spread of the subcooled jet over the horizontal plate shows a quasi-steady regime where the wetting front spreads linearly with time. The time for onset of the quasi-steady regime can be explained by a quasi-steady time. The front separates the single-phase/collapsed-bubble region from the outside region which is dry if not for the impinging droplets ejected from the front. As the front expands, the surface experiences sequence of single-phase, collapsed-bubble, wetting front evaporation, ejected-droplet evaporation cooling. The fraction of water ejected from the front increases linearly with time (reaches over 10%) and is predicted. After that, enhancement resulting from interaction of two adjacent jets impinging on largely superheated stainless-steel plate is investigated. Subcooled water jets with varying jet separation distance (up to 30 nozzle diameter) show that following an elapsed time of isolated-jet behavior, the spreading liquid wetting fronts merge and in the merged region the heat transfer coefficient increases substantially. This enhancement is presented as the two-jet cooling efficiency and we show this efficiency initially increases with the increase in separation distance, reaching a peak and then vanishes for large separation. Finally, the comparative study of 4-type of quenching methods on hot steel block is experimentally performed with heat transfer analysis and microscopic examination. For the comparison, water/oil immersion, forced immersion and multiple jet quenching are selectively adopted. Two material types of steel such as stainless steel (SUS310S) and alloy steel (SNCM439) are used to compare boiling heat transfer characteristics and microscopic examination, separately. The surface temperature and heat flux are determined by solving inverse heat conduction and followed boiling phenomena are visualized by high-speed imaging. Furthermore, microscopic examination was performed with SEM to verify the metallographic structures after each quenching method, and the mechanical properties are also examined. All 4-type methods showed qualitative agreement in the variation of martensitic fraction depending on each cooling rate. As the surface is cooled more rapidly, the higher volume fraction of martensite are formed and shows enhanced mechanical properties.1. Introduction 1 1.1 Overview 1 1.1.1 Overview of Liquid Jet Impingement 1 1.1.2 Boiling Mechanism of Jet Impingement Boiling 4 1.2 Objectives of Present Study 8 2. Experimental Apparatus and Arrangements 16 2.1 Flow System of Single/Two Jet Impingement 16 2.2 Experimental Apparatus for 4-types of Quenching Method 20 2.3 Experimental Conditions of Present Study 26 3. Estimate Thermal Boundary Condition and Microscopic Analysis 28 3.1 Inverse Heat Conduction Problem (IHCP) 28 3.1.1 Overview of IHCP 28 3.1.2 Algorithm/Calculation of IHCP 32 3.1.3 Evaluation of Heat Transfer Coefficient 35 3.2 Microscopic Analysis of Quenched Surface 37 4. Experimental Results and Discussion 39 4.1 Quasi-steady Front in Single Subcooled-jet Impingement Boiling 39 4.1.1 Flow Visualization and Cooling Regions 39 4.1.2 Quasi-steady Regime 46 4.1.3 Wetting Front Propagation 50 4.1.4 Fraction of Liquid Ejected at Propagating Front 53 4.2 Effect of Two Interacting Jets on Boiling Heat Transfer 56 4.2.1 Flow Visualization and Cooling Regions 56 4.2.2 Boiling Heat Transfer Analysis of Two Interacting Jets 60 4.2.3 Enhancement of Two Interacting Jet 70 4.3 Comparison of 4-type of Quenching Method 74 4.3.1 Comparison of Heat Transfer Analysis of 4-type of Quenching Methods 74 4.3.2 Comparison of Microstructure Analysis of 4-type of Quenching Methods 88 5. Concluding Remarks 92 References 95 Abstract in Korean 103Docto

Intestinal tuberculosis : the tuberculosis involvement of alimentary

의학과/석사[한글] 장관결핵은 1959년 이후 항결핵요법으로 폐결핵과 함께 그 발병빈도나 유병율이 현저하게 감소되었지만 한국에서는 아직도 결핵질환의 발병빈도가 높다. 폐결핵의 진단은 용이하지만 장관계에 발생하는 결핵질환의 진단은 매우 힘든 일이다. 연세대학교 세브란스 병원 외과교실에서 1954년부터 1976년 8월말까지 치료한 장관결핵환자 116예를 일상기록을 중심으로 연령, 성별 및 주소 이학적 및 검사실소견, 수술 및 그 치료성적을 보고하며, 그중 62예는 수술을 받았고, 33예에서는 개복술로써 그 진단을 확진하였고, 21예는 고식적치료를 시행하였다. 1. 평균 발병연령은 33세였고 2세부터 72세까지 였고 최다발병 연령은 20∼40세이다. 2. 남녀비율을 보면 1:1.7로 여자에 많았다. 3. 장관결핵환자 총 116예중 56%가 흉부 X-ray 상 음성이였다. 4. 주 자각증상은 복통, 설사 및 체중감소였다. 5. 주 이학적 소견은 복부종괴, 압통, 복부팽만감등이었다. 6. 감사실소견은 진단에 큰 도움을 주지 못하였다. 7. 장관 분포는 대부분이 희맹장부위로 다발성내지는 범발성으로 전예의 85%를 차지하였다. 8. 원발성 잔관결핵은 비추형이 많고 전예의 56%였다. 9. 병발증은 장패쇄, 장천공, 장관루 등의 순으로 나타났다. 10. 장관결핵은 타 장관 질환과의 감별이 어려웁고 특히 종양 또는 crohn씨 병과는 더욱 어려워 개복술에 의한 병리조직검사만이 가능하였던 경우가 대부분이었고 수술시 결빙절편도 도움이 되었다. 11. 임파절제술로 우수한 결과를 얻었고 절제가 불가능할 경우는 by pass 또는 장관치술을 실시하였다. 수술후에는 전예에서 항결핵요법을 시행하여 2예의 재발을 제외한 전예에서 치유된 성적을 얻었다. [영문] The tuberculosis involvement of alimentary tract was remarkably lower in incidence & morbidity, along which pulmonary tuberculosis since the use of antituberculosis agents in 1950. But the incidence of tuberculo(??)n disease is still high in Korea and the diagnosis of alimentary tract tuberculosis is hard. These 116 diagnostic criteria, was treated in Yonsei University Medical Center during the past 22 years from 11954 to August 1976. Of then, 62 patients had operative management, 33 had consevetive treatment. 1. The average age of all patient is 33 years, with its range from 2 to 72, and its peak incidence in the 20-40 years. 2. The sex ratio is 1:1.7 in faver of females. 3. The chest P-A X-ray is negative in 56% of all patients. 4. The freguent subject symptoms are abdominal pain, diarrhea and weight loss. 5. The freguent physical signs are papable mass, tenderness and distension 6. The laboratory findings is not a vailable. 7. The involvement of alimentary tract is multiple or diffuse and freguently involved ileo-cecal region(85%). 8. The primary alimentary tuberculosis is hypertrophic type and 56% in incidence. 9. The common complications are intestinal obstruction, intestinal perforation and fistula. 10. It is so difficult to differentiate clinically from all of the abdominal disease, especially from carcinoma and chronic disease, that pathological diagnosis should be made on abdominal exploration. Examination of frojen sections during operation is helpful. 11. Excellent prognosis can be expected with primary resection as possible as, if the resection is inevitable rather than exclusion(by-pass)or diversion(exteriorization) type of operation. It is advisable chemotheraphy post-operatively since most of the patients have multiple or difusse type of pathology along the gastro-intestinal tract.restrictio