• 한국축산시설환경학회지
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• 제21권1호
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• pp.1-8
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• 2015

This study was conducted to investigate the dispersion prediction of odor from Hanwoo and dairy farms. Gaussian Plume model used in considering of farm size, wind velocity, atmospheric stability and threshold odor unit to prediction of odor dispersion based on the survey on current state of odor emission and control from 9 site of Hanwoo and 9 site of dairy farms. Farm size, wind velocity and atmospheric stability were affected the distance of odor dispersion, showed longer distance in cases of large farm, low wind velocity and stable atmospheric condition. We will suggestion the adjusted distance of odor dispersion according to farm size was estimated to 50~100 m in Hanwoo farm and 50~150 m in dairy farm when apply the 3OU, 5 m/s wind velocity and stable atmospheric condition.

• Journal of Electrical Engineering and Technology
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• 제9권6호
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• pp.1891-1899
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• 2014

A reliability model of wind farm located in mountainous land with complex terrain, which considers the cable and wind turbine (WT) failures, is proposed in this paper. Simple wake effect has been developed to be applied to the wind farm in mountainous land. The component failures in the wind farm like the cable and WT failures which contribute to the wind farm power output (WFPO) and reliability is investigated. Combing the wind speed distribution and the characteristic of wind turbine power output (WTPO), Monte Carlo simulation (MCS) is used to obtain the WFPO. Based on clustering algorithm the multi-state model of a wind farm is proposed. The accuracy of the model is analyzed and then applied to IEEE-RTS 79 for adequacy assessment.

• 한국축산시설환경학회지
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• 제20권2호
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• pp.41-48
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• 2014

This study was conducted to investigate the dispersion prediction of odor from swine farms in Korea. Gaussian Plume model used in considering of farm size, wind velocity, atmospheric stability and threshold odor unit to prediction of odor dispersion based on the survey on current state of odor emission and control from 48 site of swine farms. Farm size, wind velocity and atmospheric stability were affected the distance of odor dispersion, showed longer distance in cases of large farm, low wind velocity and stable atmospheric condition. We will suggestion the adjusted distance of odor dispersion according to farm size was estimated to 180 m in small farm and 320 m in large farm when apply the 3 OU, 5 m/s wind velocity and stable atmospheric condition.

• 제어로봇시스템학회논문지
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• 제19권1호
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• pp.34-39
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• 2013

This paper proposes the implementation of robust fuzzy controller for designing intelligent wind farm and mitiagating the fluctuation of wind power generator. The existing researches are limited to individual wind turbine with variable speed so that it is necessary to study the multi-agent wind turbine power system. The scopes of these studies include from the arrangements of each power turbine to the control algorithms for the wind farm. For solving these problems, we introduce the composition of intelligent wind farm and use the T-S (Takagi-Sugeno) fuzzy model which is suitable for designing fuzzy controller. The control object in wind farm enables the minimizing the fluctuation of wind power generator. Simulation results for wind fram which is modelled as mathematically are demonstrated to visualize the feasibility of the proposed method.

• 농촌계획
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• 제18권4호
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• pp.141-152
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• 2012

Recently the package design for agricultural product of farm stay is great interests for increasing the income of farmers and villages as it may fulfill the sensible needs of consumers who experience rural culture and farm stay. This paper presents the status of the package design for agricultural product of farm stay and proposed improvements to the package design as following; 1)to diversify the packaging capacity, 2)to develop the cultural products to applicate the traditional crafts technique, 3)to provide institutional strategies for presenting the identity of farm or village, 4)to develop the education program about package design. We sampled fifty pilot farms or villages, analyse the package design of them and questionnaire surveyed farmers and managers in order to find problems and suggest improvements.

• 한국환경복원기술학회지
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• 제8권3호
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• pp.43-52
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• 2005

Evaluations of the fish farm influences on stream water quality may provide basic informations on watershed management to reduce environmental impact due to fish farm development and to conserve stream water quality in forested watershed area. In this research influent, effluent water in the fish farm and stream water qualities around Mt. Baegun area were monitored seasonally for six years and the following results were obtained. Due to the increase of pH in effluent water from the fish farm it was believed that alkalization of stream water can be accelerated by large scale development of fish farms in the forested watershed area. Also, effluent water from the fish farm increase of EC higher than influent and stream water. As a result of regression analyses, pH, EC, DO, water temperature, total amount of cation and anion in influent and effluent water of fish farm show high significance.

• Wind and Structures
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• 제20권6호
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• pp.751-761
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• 2015

A multi-platform offshore wind farm is receiving the worldwide attention for the sake of maximizing the wind power capacity and the dynamic stability at sea. But, its wind power efficiency is inherently affected by the interference of wake disturbed by the rotating blades, so its layout should be appropriately designed to minimize such wake interference. In this context, the purpose of this paper is to introduce a layout optimization for multi-platform offshore wind farm consisted of 2.5MW spar-type floating wind turbines. The layout is characterized by the arrangement type of wind turbines, the spacing between wind turbines and the orientation of wind farm to the wind direction, but the current study is concerned with the spacing for a square-type wind farm oriented with the specific angle. The design variable and the objective function are defined by the platform length and the total material volume of the wind farm. The maximum torque loss and overlapping section area are taken as the constraints, and their meta-models expressed in terms of the design variable are approximated using the existing experimental data and the geometry interpretation of wake flow.

• 농촌지도와개발
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• 제13권2호
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• pp.287-298
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• 2006

The purpose of this study were to analyze the agricultural work and household work of farm couples. Time use survey are vital towards understanding social obligations and also an important input policy analysis. Rural farm work divided into the peak and the off-peak farming seasons was analysed to study the allocation of daily time use among farm couples. The major results are as follow: Farm work time is longer in the peak than in the off-peak. Especially, women farmer's farming work time in the off-peak is still longer than man farmer's that. The gender difference in total work time in this study shows that the women farmers work more. During both seasons, the time allocation of the women farmer were unbalanced because of the differences in the level of workload by gender.

• 한국정보통신학회논문지
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• 제21권8호
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• pp.1560-1566
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• 2017

최근 사물 인터넷 센서가 설치된 스마트 돈사의 보급을 통해 돈사 관련 빅데이터 축적이 가능해졌고, 다양한 기계 학습방안들이 수집된 데이터에 적용되어 축산농가의 생산성을 향상시키고 있다. 본 연구에서는 다양한 기계학습 방안을 이용하여 돈사관리에서 가장 중요한 요소 중 하나인 급수량을 예측하였다. 구체적으로 실제 돈사에서 수집된 데이터에 회귀 방안인 선형회귀, 회귀트리 및 아다부스트 회귀 방안과 분류 방안인 로지스틱 분류, 결정트리 및 서포트 벡터 머신 (SVM) 분류방안을 적용하여 돈사의 온도와 습도를 기반으로 급수량을 예측하였다. 성능 분석을 통해서 제안한 방안이 높은 정확도로 급수량을 예측하는 것을 확인할 수 있었다. 제안한 방안은 돈사의 급수시설 이상을 조기에 파악하는데 활용되어 가축을 폐사를 막고 돈사 생산성을 높이는데 활용될 수 있다.

• 농업과학연구
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• 제19권2호
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• pp.238-268
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• 1992

Since rural people migrated to urban area as a result of rapid industrialization in Korea, a significant proportion on agricultural labor farces has consistently reduced and therefore incurred labor shortage in rural area which might aggravate the farm household's economy. This sutdy suggests a long run plan of supplying agricultural machines for forage cultivation based on the survery of 102 livestock farm housecholds conducted in 1987, aimed at curtailing the labor costs which would contribute to improving the livestock farming management. The results of this study are as follows: 1. Among the 102 livestock farm household surveyed, 50 farm housecholds were found to cultivate 398a of grassland on average while other 52 farm households produced the forage on the 169a of land under cultivation averagely. 2. Over 50 percent of farm houseolds were reported to have their own agricultural machine for harvesting and cutting, however rates of mechanization in other operations such as mowing and sowing were less than 20 percent. 3. There were more than 50 percent of livestock farm households who have shown their intention to buy and operate their own farming machines when proprer opportunities are given. 4. In order to estimate the long-run demand for agricultural machines for livestock farm household considering current mechanization procedure, data for the machine's optimal capacty, growth of arable acreage for feed stuffs was collected and analyzed. 5. Based on the estimated demand, long range supply plan of livestock farming machines for the period of 1990-2010 was suggested. 6. Finally, measures for technological developement and finanacial support were suggested to implement so as to encourage the farmers' adoption of agricultural machines, and to achieve the goal of mechanization planning for the livestock farm household.