• 농촌계획
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• 제12권4호
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• pp.77-82
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• 2006

The objective of public works planning is being converted from economic growth to sustainable development. So, the demand for considering social & ecological influences as well as economic components had been increased in evaluation of public works planning. In evaluation of public works, its components related with benefit and cost in feasibility analysis can be classified to qualitative and qualitative elements. Qualitative elements are evaluated by qualitative methods which can manage various items, be commonly applied nationwide, and consider elements that can be calculated numerically such as environments, willingness, etc. In this study, using the concept of 'Information measure', a method to design planning of rural works is proposed. 'Information benefit model' for rural works can evaluate present plan in the side of provider's and demander's 'benefit'. And, optimizing method of rural works by 'Information benefit' can simulate present state and optimize the site and route of rural works.

• Journal of Biosystems Engineering
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• 제35권1호
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• pp.10-14
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• 2010

Biodiesel of 20% (BD20) and 100% (BD100), alterative fuels for tractor, were tested for its power and competitiveness in the various farm operations including plowing and rotary tilling in the paddy fields. No troubles such as engine ignition or abrupt stopping were monitored during the works of plowing, rotary tilling and travelling on the road. According to the tractor PTO test in accordance with OECD tractor PTO test codes, no significant PTO output difference was found between the three fuels. However, fuel consumption rates were different between the biodiesels and diesel fuel in the paddy works, where as biodiesel percentage increased more fuels were spent than the diesel fuel. The reason for this phenomenon seems came from density difference of the three fuels. Maximum fuel consumption difference occurred between BD100 and diesel fuel was about 10% in the plowing. More energy was spent on the rotary tilling operations than the plowing, where 35~40 % more fuel needed on rotary tilling than plowing. Of the exhaust gases, more $CO_2$ was discharged from diesel fuel than biodiesels, but more NOx from biodiesels and CO was hard to determine which fuel produce more amount.

• 농촌계획
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• 제15권4호
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• pp.11-17
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• 2009

Rural Amenity Design Competition is opened every year since 2003 having an intention of improving spatial design and planning of rural area through developing values of rural amenity resources and applying in that area. The subject of this competition is broad and there's no limit in locations so that various solutions and original ideas could be proposed. This research examined 165 prizewinning works of the competition and analyzed the locations and areas, aims, main resources, spatial planning contents and experience programs to find out trends of rural spatial design. According to the study, the prizewinning works tends to 1) include spatial plan for an existing village planning, 2) aim rural tourism for citizens and increasement of resident's incomes, 3) develop vegetation and agricultural resources, 4) plan for natural landscape, commercialization of local special productions and agriculture, and 5) propose ecological experience programs. The same theme of the competition repeated every year had led to advanced design skills but also a stagnant of design contents. A subject and a main goal of the Rural Amenity Design Competition should be departmentalized each time hereafter to make for the weak points and propose progressive direction for the rural spatial design.

• 한국건축시공학회지
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• 제9권4호
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• pp.147-155
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• 2009

최근 들어 농촌에서는 농업규모의 증가, 기술적 복합성 증가, 대량 생산으로 시설물이 점차 다양화, 대형화, 복잡화 되고 있다. 또한 농업의 국제 경쟁력을 갖추기 위해 새로운 관리기술이 필요시 되고 있는 실정이다. 따라서 본 연구는 농촌시설물을 관리할 수 있는 정보시스템 구축을 위한 분류체계를 설정하고자 한다. 시설물에 대한 분류체계 및 코드부여 작업을 통해 PCM(조달-시공-유지관리)정보시스템 구축을 할 수 있을 것이다. 연구의 내용은 국내 건설정보 분류체계의 시설물(Facilities), 공간(Spaces), 부위(Elements), 공종(Works), 자원(Resources)의 5가지 자료를 분석하였으며, 농촌시설물에 적합한 항목들을 도출하였다. 농촌시설물 중 가장 높은 비율을 차지하는 비닐하우스, 온실, 축사 순으로 위계를 설정하여 연구를 진행하였으며, 그 결과, 비닐하우스는 프레임 공간과 시설물 마감공간으로 구분하여 자재코드를 부여하였다. 온실의 경우는 창호의 형태에 따라 코드를 부여하였으며, 축사는 H-beam축사, Pipe축사로 구분지어 코드를 부여하였다. 본 연구에서 설정된 분류코드는 향후 조달 시공 유지관리 시스템의 기초 데이터로 활용 될 것으로 사료된다. 시스템이 구축되면 제품의 부품화와 모듈화를 통해 전문가의 도움 없이 농민이 직접 설치 시공 할 수 있으며, 유지관리 및 교체부품의 정확한 구분으로 인해 폐기물을 최소할 것으로 판단된다.

• 한국농공학회지
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• 제44권3호
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• pp.101-110
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• 2002

Most of the agricultural structures are in shortage of feasible facility management because these structures are small in size and spacially distributed in rural area. Inspection tools based on visual inspections are generally used for agricultural structures in most of the countries, including Korea. It is necessary to survey data of the irrigation structures to maintain records, and to develop the interface program by constructing database of inspection data. This study was conducted to develop a system for safe appraisal and repair works on agricultural irrigation structures. Repair and rehabilitation method can be chosen from an optimum viewpoint if the information between the method and life-cycle management cost of agricultural structures is constructed in the database. In this study, the system assisting onsite field investigation and determining the typical rehabilitation method of typical agricultural structural problems such as fractures and cracks of members was developed.

• 한국작물학회지
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• 제23권3호
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• pp.19-30
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• 1978

Use of herbicides in Korean agriculture has increased rapidly in recent years accompanying with ever-increasing pressure of farm labor shortage. Herbicides occupied already the second place in the rank of pesticides consumption in 1977. The agricultural experiment stations have carried out over 50 trials of chemical weed control each year since 1968. These research works and registration trials contributed much to the present wide use of herbicides. The pesticide management act amended in 1977 requires reevaluation of pesticides for their efficacy every 5 year-term. However, the development of sound weed control program and recommendations has been hempered very much by the lack of qualified workers of weed control research in agricultural experiment stations and in the institute for pesticide registration trial. Critical review of the past research works on herbicide evaluation and the present status indicates strong need for 1) the characterization of the nature of local and national weed problem, 2) the improvement of ability of the staffs in charge of weed control research through appropriate training on the basics and experimental techniques, and 3) organization and activities of weed control research committee. Furthermore, the present article attempts to clarify commonly misled points in the establishment of herbicide evaluation plan, in the design and execution of field trials, and in the assessment of trial results of the past works from the viewpoint of the basic principles with some case studies for resolution of specific enigmas.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1998년도 학술발표회 발표논문집
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• pp.401-406
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• 1998

This study aimed at the technique for the construction control in braced excavation works. Selecting a case of Kwangju subway works, field observational values were compared with prediction using Plaxis's. Maximum observational values relevant to both horizontal and vertical proved satisfactory in that they were within the criteria. Numerical results by used Plaxis were overestimated greater than observational values, which meant the prediction were safe tendency. .It must be emphasized that displacement measurement for neighboring important structures should be carried out in order to take countermeasure charge for construction methods, in case that the risk or failure was previewed.

• Environmental Engineering Research
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• 제13권1호
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• pp.33-40
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• 2008

Levels of arsenic in stream and reservoir waters affected by an abandoned gold mine were examined. The abandoned mine has been left without proper civil and remedial works preventing potential environmental hazards. Field and laboratory chemical analyses revealed that the stream waters downgradient from the mine area were severely contaminated with arsenic and furthermore the reservoir water, 2-3 km away from the mine, also contained substantial levels of As, far exceeding the Korean stream water standard. Relatively higher pH values (6.5-9.4) enhanced mobility of As and mainly sustained substantial As concentration in waters. Chemistries of the stream water, groundwater and reservoir water were dominated by two main factors including effects of mine effluent and anthropogenic agricultural activities. Considering that there has been a substantial As input to the reservoir and the reservoir water has been used for agricultural and domestic uses, immediate remedial works are essentially required.

• 한국농공학회지
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• 제34권2호
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• pp.60-72
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• 1992

This study aims at predicting the behavior of saturated soft clayey foundation subjected to earth structure loads such as tidal dike, embankment etc. by using Biot's consolidation equation coupled with elasto-viscoplastic constitutive model. To validate the computer program developed b author, a case study was performed for the site of Kwang-yang steel works improved by sand drain, where since the beginning of the works, field measurements(settlement, lateral displacement and excess pore water pressure) had been accurately achieved. Comparisons between numerical results and observation values were carried out. The main results obtained are summarized as follows : 1. Settlement and lateral displacement between numerical and observation values show satisfactory accordance. 2. As for the exess pre water pressure, numerical results appear to be larger than observation values, which may be due to the existence of sand seams which were not found during soil investigation. 3. Useful data available for failure prediction of soft foundation can be secured by examining lateral displacement, settlement, exess pore water pressure and stress paths.

• 한국농공학회지
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• 제40권5호
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• pp.52-58
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• 1998

The objective of this study was to develop a polymer mortar protection block with high strength and durability using unsaturated polyester resin to complement defects of conventional cement mortar protection block. Physical and mechanical properties of the polymer mortar protection block were also investigated. Low absorptivity, high impact strength, and great bending strength of the polymer mortar protection block was compared with those of the conventional cement protection block. In conclusion, the polymer mortar protection block is excellent and useful as industrial products for erosion control works.