농업용수의 가격구조에 관한 연구

심기영 한국농공학회 1973 한국농공학회논문집 Vol.15 No.4

This study of the subject will review past and present irrigation development in Korea. Particular attention will be given to water pricing structure and a case study on the purpose of rational operation and management of irrigation water and organizations, and the optimum irrigation water and organizations, and the optimum irrigation water fee inorder to reduce farmers burden and to rationalize the farmland associations management so as to achieve development of the rural environment. In 1971, the reservoir of the Farmland Improvement A sociation (FIA) produced only 775 millison $m^3$ of irrigation water or 77% of planned capacity of 1,015 million $m^3$. It was caused by inefficient maintenance of irrigation facilities; for instance, about 21% of reservoirs, pumping stations and weirs in Korea have been silted by soil erosion which hinder to water production according to an ADC survey. The first Irritation Association was established in 1906, whcih was renamed the Farmland Assoeiation by the Rural Development Enouragement Law in 1970. By the end of 1971, 411,000 ha of rice paddies were under the control of 267 associations nationwide. The average water price assessed by Associations nationwide rose from 790 won per 0.1 ha. in 1966 to 1,886 won in 1971. The annual growth rate was 20%. The highest water price in 1971 was 4,773 won her 0.1 ha. and the lowest was 437 won. This range was caused by differences in debt burden, geographic conditions and management efficiency among the Associations. In 1971, the number of Associations which exceeded the average water price of 1,886 won per 0.1 ha. was 144, or 55.1% of all Association. In determination of water price, there are two principles; one is determined by production cost such as installation cost of irrigation facilities, maintenance cost, management cost and depreciation ect. For instance, the Yong San River Development project was required 33.7 billion won for total construction and maintenance cost is 3.1 billion won for repayment, maintenance and management cost per year. The project produces 590 million $m^3$ of irrigation water annually. Accordingly, the water price per $m^3$ is 5.25 won. The other principle is determined by water value in the crop products and in compared with production of irrigated paddy and non-irrigated paddy. By using this method, water value in compared with paddy rice vs. upland rice(Average of 1967-1971) was 14.15 won per $m^3$ and irrigated paddy vs. non-irrigated paddy was 2.98 won per $m^3$. In contrast the irrigation fee in average association of 1967-1971 was 1.54 won per $m^3$. Accordingly, the current national average irrigation fee(water price) is resonable compared with its water value. In this study, it is found that the ceiling of water price in terms of water value is 2.98 won per $m^3$ or 2,530 won per 0.1 ha. However, in 1971 55% of the associations were above the average of nationwide irrigation fees. which shows the need for rationalization of the Association's management. In connection with rationalization of the Association's management, this study recommends the following matters. (1) Irrigation fee must be assessed according to the amount of water consumption taking intoaccount the farmer's ability. (2) Irrigation fee should be graded according to behefits and crop patterns. (3) Training personnel in the operation and procedures of water management to save O&M costs. (4) Insolvent farmland association should be integrated into larger, sound associations in the same GUN in order to reduce farmers' water cost. (5) The maintenance and repair of existing irrigation facilities is as important as expansion of facilities. (6) Establishment of a new Union of Farmland Association is required to promoted proper maintenance and to protect the huge investment in irrigation facilities by means of technical supervision and guidance.

MIME 형식의 전자우편을 이용한 전자카탈로그 검색 시스템 설계

심기영,한상용 중앙대학교정보통신연구소 2001 정보통신연구소논문집 Vol.3 No.2

인터넷 보편화에 따른 전자상거래의 폭발적 증가에 힘입어 오늘날의 기업환경은 디지털 경제하의 산업구조에 맞추어 급속히 개편되고 있다. 그러나 이러한 작금의 변화를 수용하지 못하고있는 해상의 기업환경에서는 무선통신기술의 한계로 인해 웹 서핑을 한다는 것조차 상상하기 어려운 일이다. 본 논문에서는 자유로운 인터넷 사용이 불가능한 선박 등에서 기존의 위성 e-mail서비스를 이용하여 사용자가 원하는 데이터를 검색, 획득하기 위한 아키텍쳐를 제안하고, 이를 전자카탈로그 시스템에 적용해 해상의 기업환경에서도 육상의 발빠른 e-business 환경에 한걸음 다가가고자 한다.

Sleeve 혈관문합술에 대한 조직학적연구

유재덕,이세일,오석준,심기영 大韓成形外科學會 1983 Archives of Plastic Surgery Vol.10 No.2

During the past decade, microsurgery has become clinical routine and resulted in many technical innovations. Inspite of this, microsurgery still entails certain disadvantages; it is time consuming, technically demanding and sometimes results in distressful failure. The sleeve microanastomosis, proximal vessel end is inserted into distal vessel using only two extraluminal sutures, is easier and less time consuming than conventional end to end anastomosis. However, there is a few reports about the histological study to support the beneficial technique of the anastomosis. An animal study was carried out by doing 25 sleeve anastomoses of carotid arteries of white stratin rats and subsequent histological observations in different time interval in order to clarify the modesty of repair in anastomosed vessels. The following are noted as results: Patency rate of the anastomosis was 84%. No aneurysm was found at any site of the anastomosis. The narrowing of lumen of the inserted proximal vessel, the formation of thrombosis & fibrin clot in foci at proximal vessel end, and the loss of intima at the site of anastomosis were noticed in 3 days following the anastomosis. Still narrowing of the lumen of inserted vessel, the formation of thrombosis & fibrin clot in foci at proximal vessel end were persisted with focal necrosis of the media at the stitch area of dista lvessel in one week following anastomosis. Disappearance of thrombosis & fibrin clot on proximal vessel end complete restoration of intimal continuity with slight atrophy of media on distal vessel were noted in 3 week following anastomosis. Neoitima formation at anastomosis site with moderate atrophy of media on distal vessel were noted in 5 week following anastomosis. Subintimal hyperplasia was not observed except in one case of medial necrosis due to wide adventitial stripping in 8 week following anastomosis.

바람에 의한 차량의 공기역학적 주행안전성에 관한 연구

김철호(Chul-Ho Kim),이용훈(Yong-Hoon Lee),심기영(Ki-Young Shim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11

The importance of aerodynamic design of a vehicle is on fuel economy and driving stability of the vehicle. In this theoretical study, the dynamic forces and moments acting on a running vehicle in high speed on the road were estimated because the physical energy acting on the moving body has serious effect on its dynamic stability problem. As wind approaches to the moving body in arbitrary direction, it gives more critical situation in driving stability of the vehicle depending on the wind direction and speed. In general, three different types of moment are acting on a moving body; rolling, yawing and pitching moment. Among them, the former two physical motions are serious in the driving stability of a vehicle but the pitching motion is less critical than those two moments. In this research, the governing equation to estimate the size of rolling and yawing moment of a vehicle in high-speed under the wind was derived and the criteria of the dynamic stability of the vehicle was defined at the given specific driving condition. The research outcome would be very informative on the development of an aerodynamic device for the driving stability of a high-speed vehicle on a road.