農業構造의 改善方向

林栽煥 忠南大學校 地域開發硏究所 1989 地域開發論叢 Vol.1 No.-

새로운 示範 農村 建設 方向 : 農漁村定住生活圈開發事業을 중심으로 With Respect to Rural Settlement Zone Development Project

林栽煥 충남대학교 농업과학연구소 1995 농업과학연구 Vol.22 No.2

To mitigate the development gap between urban and rural area, the government has implemented project planning as the Rural Integrated Development in each Gun level since 1986. On account of shortage of the development fund, the government had changed the Gun level development into Myeon level development so called the Rural Central Settlement Zone Development. The government had started nine pilot projects throughout Korea from 1990. This study is aimed at identifing problems that found in the course of implementation of the projects and recommending the new direction of the successful implementation of the projects in the future. The problems and directions found in the cource of project implementation were as follows: 1. Project implementation by investment priority considering economic and financial rate of return should be made. 2. Objective project planning should be made. 3. Equal allocation of the limited investment fund by group interest and egoism should be prohibited. 4. Enforcement of special man power should be taken into account. 5. Unification of the diversified existing terms and conditions of loans for house construction and improvement. 6. Road development oriented budget allocation should be improved. 7. Sufficient development fund should be procured considering the present rate of sufficiency of the project cost as 36%. 8. Sufficient supply of the credit loans for improvement of living environment of the farmers should be realized. 9. Rational implementation planning in connection with farm household income source development should be made.

農漁村 特産團地運營上의 問題點 및 政策的 改善方向 : 忠淸南道를 中心으로 In the Case of Chungnam Province

林栽煥 충남대학교 농업과학연구소 1993 농업과학연구 Vol.20 No.1

This study is aimed at evaluating the present management status of the rural special production area development projects and identifying managerial problems to propose new direction of the political countermeasures for the projects. In the context of implementing the five year's economic developont plans for the past three decades. agricultural production and farm-household income have also been grown rapidly. However the income gap between rural and urbarn laborer. as an internal problem, has widened during the decades and the UR problems concerning free trade of agricultural products. as an external problems. are now agonizing the small-holder farm economy in Korea, The internal and external farm problems could be solved through improvement of agricultural structure and provision of off-farm jobs for farm household income increase. As a part of the off-farm income sources. the rural special production area development projects have propelled by the government throughout, the country. The main problems to be solved for the successful implementation of the projects are as follows: l, Present loan amount by the financial fund was estimated at 6-7% of the total installation costs required. To expand and implement the project successfully. enough financial credit support with favorable terms and conditions have to be considered by the government. 2. The operation patterns of the special production area development project should be recommended from the view point of cooperative and private operation to maximize farm household incomes including profits, marketing charges and dividens. 3. Improvement. of the marketing channel of the products and marketing information. through TV program and other mass communication should be implemented strongly to promote marketsales by the financial supports of the government. In connection with the off-farm income increase. the population migrating to urban area in outside Chungnam province equivalent to 10-12 thousand persons with age of 20..49 years should be taken into account politically to be employed in the projects in the province. 5. Surplus farm labors should be created by means of improvement of agricultural structure including large farm management with farm mechanization and job opportunities have also to be provided in connection with the rural special production area development projects. The two imminent subjects are the prerequisites to increase off-farm incomes for the farmers living in Chungnam province. 6. Required credit, supports for investment and operation costs of the projects should be taken actions by the government.

生命工學 認知度 및 經濟的 價値評價

林裁煥,玄柄煥 충남대학교 농업과학연구소 1997 농업과학연구 Vol.24 No.1

Modern biotechnology, specifically for the use of recombinant DNA(rDNA), has brought about a revolution in our ability to control and use life forms. Most of the world's leading countries view biotechnology as the key scientific and industrial discipline for the 21st century and are making all-out efforts for scientific and technological advance in the related fields. The impact of biotechnology on the nation's economy has been growing explosively as such diverse industries invested increasingly on the fruits of biotechnological research. However, such an impact could only be realized through concerted endeavours from the government to private sectors for guarantee of the successful technological advances in this scientific area. There are risks associated with every technology; the classical application of biotechnology has not been exempt. For example, the introduction of bio-tech to agriculture might be destroied the ecosystems. Therefore, to increase the research budgets by the government and private sectors, we need to identify the public attitudes and preference on the acceptance of bio-technology and on the potential economic value of it. For the study, we surveied 959 persons including students enrolled in college of agriculture, Chungnam National University. And to measure the economic value of biotechnology, we use the Contingent Valuation Method(CVM) which is considered as the new approaching method in the bio-technology field.

무선 패킷 네트워크에서 동적 시분할 이중화를 이용한 MAC 프로토콜의 설계와 해석

임재환 남서울대학교 1999 남서울대학교 논문집 Vol.5 No.-

In this paper, we proposed a wireless MAC protocol called DTDD/PS (Dynamic Time Division Duplex using Poll/Select scheme). This protocol adopts a dynamic channel allocation scheme which can support the multimedia traffic in wireless packet network. Delay and throughput performance is evaluated using mathematical analysis and computer simulation. The analytical results show that if C_T, me maximum number of data slots between consecutive reservation slots, is set to small value, the number of reservation slot is increased and the queueing delay in base station is also increased and otherwise, the lack of reservation slots makes long delay for access. The simulation results with varying down link traffic loads shows that system capacity is improved over that of PRMA. The system capacity, denoted by M_0.01, is defined as the maximum number of conversations, which can be supported under constraint of packet dropping probability no more than 1%. It is shown that the values of M_0.01 for down traffic load λ_d=0.5, λ_d=0.2, λ_d=0.l and λ_d=0.001 are about 43, 69, 77 and 83, respectively. It indicates that DTDD/PS protocol achieves a significant improvement in system capacity compared with PRMA protocol.

조류 중 원형실린더 형상 구조물의 거동감소를 위한 실험적 연구

임재환,조효제,황재혁,김재희,이태경,최윤우,이민준,김영규 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.4

The development of marine technology is expected to increase the demand for marine plants because of increasing oil prices. Therefore, there is also expected to be an increase in the demand for cylindrical structures such as URF (umbilical, riser, flowline) structures and spars, which are used operating in various seas. However, a cylindrical structure experiences vortex induced motion (VIM) in a current. In particular, for risers and umbilicals, it is important to identify the characteristics of the VIM because interference between structures can occur. In addition, various studies have been conducted to reduce VIM because it is the cause of fatigue damage to structures. The helical strake, which was developed for VIM reduction, has an excellent VIM reduction performance, but is difficult to install on structures and has a negative effect on heave motion. Therefore, the purpose of this study was to supplement the shortcomings of the helical strake and develop a high-performance reduction device. In the reduction device developed in this study, a string is placed around the structure inside the flow, causing vibration. The vibration of this string causes a small turbulence in the flow field, reducing the VIM effect on the structure. Finally, in this study, the 2-DOF motion characteristics of models without a suppression device, models with a helical strake, and models with a string were investigated, and their reduction performances were compared through model tests.

새만금 干拓綜合開發事業의 國土擴張效果 分析

林栽煥 충남대학교 농업과학연구소 2000 농업과학연구 Vol.27 No.2

This study is aimed at identifying the socio-economic value of the total area of 23,500ha of paddy field which will be reclaimed in year 2003. In Korea, tidal land reclamation projects has been carried out not only for paddy field expansion to meet national food security but also for national land expansion to cow with the shortage of land supply in implementing urbanization and industrialization. As of end of 1999, 75,733ha of tidal land reclamation, 48.3%, out of 156,666ha has been carried out in Korea. In spite of continuous implementation of tidal land reclamation projects, the appraisal of the national land expansion value has not been made even though the severe competitiveness of land use in economic development. Agricultural land about 20,000 _ 30,000ha per year has been converted to urban and industrial land and the converted areas have been produced higher added value than that of the farm land. Accordingly, farm land expansion equivalent to the converted area have to be reclaimed to cope with the food shortage and security in the future. In relation to the study, demand and supply of rice, the staple food of Korean, has been projected up to year 2025. The study results are as follows: 1. Under the assumption of continuing the present tendencies of rice consumption, population increase, farming practices and farm land conversion, paddy area requirement to meet self sufficiency of rice were forecasted as 136,950ha in 2015, 193,460ha in 2020 and 218,482ha in 2025 respectively. 2. The average converted price of paddy per pyeong in Kimje city, Puan Gun and Gunsan city was estimated at 241,150won and average farm land price was amounted to 63,760won. The differential rent was estimated at 177,400won per pyeong which was used as a criteria for valuation of national land expansion effect of the tidal land reclaimed by Saemangeum project. The total land rent of 23,250ha expanded by tidal land reclamation was amounted to 12,351 billion won. Annual expected value of the expanded national land was estimated at 988.9 billion won considering 8% of annual discount rate in Korea. 3. Tidal land resource for paddy area development is limited comparing with the future requirement of paddy area to cope with self sufficiency of rice consumption. Accordingly farm land conversion to urban and industrial land should be regulated and protected in the sense of sustainable development in the future.

干拓事業의 多機能的 便益-費用分析과 發展方向

林栽煥 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.2

The most limited production resource in Korea is land. During the period from 1995 to 2002, annual farm land area of 17,600ha have been converted to urban and industrial land. The self-sufficiency rate of rice, Korean staple food, is expected to be decreased from 97.5% in 2003 to 60-70% in 2020. Under such conditions, this study is aimed at first identifying multifunctional benefits of the reclamation projects such as agricultural production, industrial water supply, urban land supply, transportation effects, sightseeing effects and environmental values with and without the projects. To carry out the objectives, three existing tideland reclamation projects such as Daeho, Kumgang and Yongsangang irrigation project stage II were evaluated and Saemangeum tideland reclamation project which was jointly revaluated by environmental NGO and Govn't appointed specialists in 2000 was reviewed. According to this study results, tide land reclamation projects were showed financially and economically feasible and environmentally sustainable. The pint cost like estuary dam should be allocated based on the multi-functional benefits of the projects. To allocate the joint cost, legal and institutional improvement should adapt the joint cost allocation method as the specific cost-remaining benefit method. Korea has more than 402,000 ha of tidal flat of which 76,396ha have been reclaimed in 2003. To meet food security and to cope with shortage of land, phil-environmental reclamation projects should be continuously implemented and necessary tidal flats for protecting environmental ecosystem should be remained according to the detail survey results of reclaimable resources.

結合費用의 配分方法

林栽煥 韓國農業政策學會 1982 농업경영정책연구 Vol.9 No.1

This study was carried out to suject the methodology and actual application of cost allocation for the common facilities in land and water resource development projects. All most of the existing projects conserning land and water resource development have been carried out separately and independently by the different ministries concerned. From the view point of economic efficiencies of the limited resources, the integrated development projects including irrigation, hidro-power, municipal and industrial water should be planned jointly and managed by a certain government entity. Furthermore, the joint costs of the common facilities should be allocated to each purpose of the project and to decrease farmer's burden of the project charges in the large-scale comprehensive agricultural development projects. Here, two general methods including the Separable Costs-Remaining Benefit Method and Specific Costs-Remaining Benefit Method are recommendable for the joint cost allocation and practical application of the methods are exampled separately for the easiness of the procedures. Finally, this study is considered as a practical guidelines not only for the cost allocation of multi-purpose dam and estuary dam but also for the planning national land and water development program from the prospects of the integrated development oriented projects in the future.

農業發展段階理論과 韓國農業의 近代化過程

林栽煥 韓國農業政策學會 1983 농업경영정책연구 Vol.10 No.1