고조파 저감형 전력변환장치의 개발연구

서재호 圓光大學校 1990 論文集 Vol.24 No.2

In this paper, a new method of reducing harmonics that involved input ac line currents on it output dc voltage of the converter system is presented, which is due mainly to the equipment of 2-5 switching taps on interphase reactor. Therefore, the originality of this paper lies in microprocessor based equipment of the 2-5 switching taps on interphase reactor. I applied this method to the 12 pulse converter, and proved validity of that theoretically and experimentally. I propose a furthermore improved method, in which I employ an switching taps circuit constructed with only thyristors in the circuit of interphase reactor. Therefore, main contents of this study are the following two items; 1) Optimum value of turn ratio of interphase reactor. 2) Optimum value of control angle of switching taps. However, in case that the 5tap method is applicable to above optimum conditions, it could not bring to an effect of reducing hamonics under firing angle 15。. At present I can conclude that the converter must be constructed switching taps circuit and must be controlled 2-5 tap changing method.

환경과 지방화 시대, 그리고 국가경쟁력

서재호,최은석,Seo, Jae-Ho,Choe, Eun-Seok 환경보전협회 1995 환경정보 Vol.17 No.9

제 23 차 학술대회 : 15. 담낭공장문합술과 담낭공장문합 및 공장간문합술의 실험적 연구

서재호 대한외과학회 1971 대한외과학회 학술대회자료집 Vol.- No.-

제 24 차 학술대회 : 16. 총수담관 완전폐쇄전후 담낭담즙의 농축기능에 관한 동물실험적연구

서재호 대한외과학회 1972 대한외과학회 학술대회자료집 Vol.- No.-

消化性潰瘍의 手術前後 胃酸度 및 胃 Pepsin値의 變動

徐在皓 고려대학교 의과대학 1966 고려대 의대 잡지 Vol.3 No.1

The problem of peptic ulcer therapy is not the relief of symptoms, but the prevention of recurrent ulceration and complications. The main objective of surgical treatment is to reduce the acid secretion of the gastric mucosa. Therefore, the observation of hydrochloric acid and pepsin in gastric juice before and after operations for the purpose of studying surgical treatment of peptic ulcer with different operative choice, is being studied on our department from both physiochemical and clinical standpoints including roentgenologic studies with 28 patients of peptic ulcer ranging from 18 to 66 of ages in both female and male. In this paper we give the results of 1) Billroth Ⅱ type subtotal gastrectomy, 2) antrectomy with vagotomy, and 3) Billroth Ⅱ type subtotal gastrectomy with vagotomy on gastric acid secretion and gastric pepsin. 1) Effect of Billroth Ⅱ subtotal gastrectomy on acid secretion and gastric pepsin is a considerable reduction. Preoperative mean is 57.36±21.81 in gastric acid and 1774.07±740.59 in gastric pepsin. Postoperative mean is 3.03±1.36 in gastric acid and 1557.29±654.31 in gastric pepsin. The mean reduction for the 8 subjects was 94.56 per cent in gastric acid secretion and 12.40 per cent in gastric pepsin. 2) The results for antrectomy with vagotomy was observed. Each mean of gastric acid and gastric pepsin is 52.28±9.73, 1571.86±306.45 in preoperative and 2.78±1.93, 1370.62±256.24 in postoperative. A substantial mean reduction in 5 patients was 95.2 per cent of acid secretion and 13.5 per cent of gastric pepsin. 3) Billroth Ⅱ type subtotal gastrectomy with vagotomy results in a very marked reduction of acid secretion in these patients. Preoperative mean is 50.95±16.05 in gastric acid and 1476.17±657.75 in gastric pepsin. Postoperative mean is 1.875±1.91 in gastric acid and 1242.16±524.30 in gastric pepsin. The mean reduction in 12 cases was 96.22 per cent of gastric acid secretion and 15.00 per cent of gastric pepsin. In these results, we submit the Billroth Ⅱ type subtotal gastrectomy with vagotomy reduces most effectively the level of the gastric acid secretion and gastric pepsin for the peptic ulcer surgery.

3상 유도전동기의 운전을 위한 전류원 인버터설계

徐在鎬,李義承 원광대학교 생산 및 자동화기술연구소 1995 생산.자동화기술연구소논문집 : 원광대 Vol.- No.2

The three phase current - fed inverter discussed by phillips and Maags is becoming increaingly popular for reversible speed induction motor drive application This paper gives the designs of such an inverter for inductive loads, also the commutation analaysis of the R-L load required for the design of the three phase current-fed inverter. Experimental results have been compared with analaytical results.

他勵式 Inverter에 利用한 120˚通電形 三相 thyristor bridge에 관한 硏究

徐在鎬 大田工業專門大學 1979 論文集 Vol.25 No.-

膽囊空腸吻合術과 膽囊空腸吻合 및 空腸間吻合術의 實驗的硏究

徐在皓,睦敦相 우석대학교 의과대학 1971 우석의대잡지 Vol.8 No.2

Few systematic, comparative investigations have been performed on liver function, bile bacteriology and histopathological view during complete experimental biliary stasis together with a follow-up after release of the obstruction in dogs. Some biliary decompression techniques were performed for restoring bile flow to the jejunum 10 days after biliary obstruction. The following variables were studied before, during and after release of complete biliary obstruction: hemoglobin concentration in blood, bilirubin, protein, cholesterol, activities of alkaline phosphatase and transaminase. Bile culture, biliary reflux and histopathological findings of the liver were studied. 1) After 10 days' biliary stasis progressive anemia developed. After release of the biliary obstruction by decompression procedures, the hemoglobin concentration of the blood and body weight soon returned to normal. 2) The concentration of bilirubin especially direct reacting bilirubin reached a higher level after 10 days' biliary stasis. After release of the stasis, the bilirubin concentration returned to normal in both cholecystojejunostomy and cholecystojejunostomy with entero-enterostomy groups. 3) The observations were nade during biliary obstruction for the serum cholesterol, activity of alkaline phospatase and serum transaminase which increased markedly after 10 days's obstruction. The mean value of serum G.P.T. were more increased than G.P.T.. The G.P.T. activity was thus considered to be a better mirror of biliary stasis on the liver cells. After release of stasis, their activities returned to almost normal. 4) Serum globulin and thymol turbidity were increased during biliary obstruction, and returned to almost normal after release of the obstruction. 5) After complete biliary obstruction, the bile was sterile as in the control group while many organisms such as enterococcus were cultured after biliary-intestinal anastomosis in both biliary decompression groups. 6) The most anastomosed stomas between biliary and intestinal tract were shown to be stenosed slightly to moderately. Reflux into the biliary tract was present in all in face of the entero-enterostomy. 7) The most striking feature of the liver during the experimental biliary obstruction was cholestasis, which resulted in the dilatation of ductules, and the bile plugs in canaliculi, particularly in the centrilobular area. A significant degree of ductal cell proliferation and more prominent bile pigmented granules in Kupffer cells were observed. Focal necrosis of the liver cells of the centrilobular area were found especially in dogs which showed a marked increase of serum G.P.T.. Edema of the portal tracts, infiltration of inflammatory cells, proliferation of collagen fibers and periductal fibrosis were more remarkable in complete biliary obstruction group. After release of the obstruction by surgical decompression, slight bile pigmented granules in the Kupffer cells were found and moderate degree of infiltration of the inflammatory cells, except neutrophil, was seen with proliferation of collagen fibers and periductal fibrosis in both groups. 8) Gallbladder and the common bile duct showed marked infiltration of inflammatory cells in both cholecystojejunostomy and cholecystojejunostomy with entero-enterostomy groups. The reaction was rather severe in the gallblader. 9) There was no differencies between cholecystojejunostomy and cholecystojejunostomy with entero-enterostomy in liver function test, histopathology, degree of the stricture, biliary reflux and bacterilolgy.

선박에서의 위험ㆍ유해물질(HNS) 유출 방제를 위한 해양환경관리법제 정비방안 연구

서재호,표희동 위기관리 이론과 실천 2014 Crisisonomy Vol.10 No.12

선박에서 발생한 오염물질 유출사고는 해양이라는 특수한 장소에서 발생한 재난으로 인해 대응이 매우 어려우며 피해의 규모 또한 막대하다. 우리나라는 해양의 선박에서 발생하는 유출사고를 관리하기 위해 ‘해양환경관리법을 제정했는데, 현행법은 기름유출과 위험ㆍ유해물질 유출에 대한 방제를 모두 규율하고 있으며, 주로 기름의 유출에 대한 방제를 다루고 있다. 그러나 위험ㆍ유해물질의 해양환경 및 인체에 대한 위험성과 경제적 피해의 규모를 고려하면 기름 중심의 해양환경관리법을 위험ㆍ유해물질의 방제에까지 적용하기 위한 제도적 개선이 필요하다. 우리나라 해양환경관리법의 위험ㆍ유해물질 유출 방제를 위한 대비 및 대응관련 규정을 검토한 결과 현행 해양환경관리법제는 유출방제를 위해 대비해야 할 위험ㆍ유해물질의 대상과 범위에 대한 규정이 없으며, 위험ㆍ유해물질의 초기 긴급방제를 위한 약제와 자재의 비치의무, 위험ㆍ유해물질에 적합한 방제선의 배치 근거가 없어 위험ㆍ유해물질의 긴급방제를 실시하기 어렵다. 이러한 현행 제도의 한계를 극복하기 위해 본 연구는 현재의 기름유출 중심의 법규에 위험ㆍ유해물질의 유출 방제 대응을 위해 필요한 약제와 자재 비치의무, 위험ㆍ유해물질의 방제에 적합한 선박의 비치의무를 도입할 것을 제안하였다. Spills from ships in times of accident are extremely difficult to respond and the enormity of damages are beyond imagination due to extraordinary situations of the seas. The Marine Environment Management Act of Korea has been the framework act for the response of both spilt oils and hazardous and noxious substances(HNS) with focuses on spilt oil response. However, considering the high risk associated with the HNS to marine environment/ecosystem and human welfare as well as economic losses, revision of the existing law to fully cover the HNS response. According to the review of the existing policies and measures on preparedness and response to the HNS spill in accordance with the law, it would be extremely difficult to effectively respond to HNS emergency as the current law does not have clauses for preparedness and response for HNS, clauses for chemicals and equipment for response, and clauses for deploying the response vessels. In order to overcome the discrepancies of the current law which mainly focuses on oil spill response, this study suggests to revise the law to include the clauses for chemicals and equipment for HNS response and the deployment of HNS vessels.

지역사회 활성화를 위한 지방정부의 평생학습도시에 대한 연구:교육과 자치의 조화 관점에서 본 성과와 한계를 중심으로

서재호,이승종 한국정책과학학회 2012 한국정책과학학회보 Vol.16 No.4

This paper tried to analyze the performance of lifelong learning cities of local governments to promote local community. Lifelong learning city is a community or town which mobilizing all kinds of resources to promote personal growth, integrate people and develop all citizen's capacity. Until now the performance of lifelong learning cities of local governments was focused on educational effects. The services of lifelong education of local government were grown quantitatively and qualitatively, the infrastructures for community education were built, and citizen's quality of life was upgraded in the end. In the other hands, the performance of making strengthening the capacity of local autonomy was not improved much. To solve this problem this paper proposed several suggestions; First, develope and operate programs in a community center to promote citizen autonomy. Second strictly reorganize the goal and tool relationship between education and local autonomy. Third, increase block grant and abolish matching fund approach. fourth, connect various activities invested in local government from various central government. Last, reorganize the supporting system of lifelong learning city in the central government and make MoES and MoAS participate actively in supporting lifelong learning cities. 이 논문은 지역사회 활성화를 위한 지방정부의 평생학습도시의 성과를 분석하고 교육과 자치의 조화 관점에서 지역사회활성화를 위한 평생학습도시의 발전을 위한 정책적 시사점을 제시함을 목적으로 하고 있다. 2000년 이후 지방정부에 적용된 평생학습도시는 개인의 성장을 촉진하고 사회통합을 유지하며 번영하기 위해 시민 모두의 잠재력을 풍부히 개발하기 위해 모든 자원을 동원하는 도시 혹은 마을, 지역을 의미한다. 평생학습도시 정책의 성과는 주로 교육행정차원의 성과로, 지방정부에서 평생교육 서비스의 양적 질적 성장과 이를 위한 인프라 구축이 대표적인 성과이며, 이를 통한 지역주민의 삶의 질 증진이 중요한 성과였다. 그러나 교육성과에 비해 자치역량 강화의 성과는 매우 부족한 것으로 나타났다. 이에 따라 현재 지방정부의 평생학습도시는 다음과 같은 변화를 추구해야 한다. 첫째, 주민자치의 관점에서 평생학습도시의 주민자치센터 프로그램 개발과 운영이 필요하다. 둘째 비록 평생학습도시로 지정된 지방자치단체일 지라도 행정조직상에서 교육과 자치의 조화가 이루어 질 수 있도록 목적과 수단관계를 분명하게 정비 하여야 한다. 셋째, 지방정부에 대한 재정지원 방식의 변화가 필요하다. 넷째, 평생학습기관간 네트워크 구축을 토대로 공급자, 교육기관 중심의 관리에서 벗어나 수요자로서 학습자 중심의 관리 및 사업운영이 필요하다. 다섯째 평생학습의 관점을 중심으로 지방정부에서 이루어지는 다양한 분야의 사회투자 사업간 연계가 필요하다. 여섯째 평생학습도시정책 추진체계를 정비하여 교육과학기술부와 행정안전부가 함께 적극적으로 참여하는 추진체계의 정비가 필요하다.