• 식물병연구
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• 제12권3호
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• pp.231-234
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• 2006

오이 흰가루병(Sphaerotheca fusca)이 수량에 미치는 영향을 구명하고자 오이 잎 제거를 통한 시뮬레이션으로 적정 잎수에 관한 모의시험 및 발병도 조절에 따른 흰가루병이 수량에 미치는 영향과 경제적 피해허용수준을 검토하였다. 오이 잎 제거 수준과 수량과의 시뮬레이션 결과 봄작기에서는 오이 잎 수를 10매, 가을작기에서는 13매 정도를 유지하면 표준방제구와 큰 차이가 없었다. 오이 흰가루병 발병도가 증가할수록 수량이 감소하였으며, 특히 상품성 수량의 감소폭이 전체 수량의 감소폭보다 더 커서 상품성 수량에 큰 영향을 미쳤다. 오이 흰가루병 발병도와 수량과의 회귀식은 Y=-57.237x+6143.1, $R^2=0.9628$로 방제비용을 감안하여 수량 3% 지점의 발병도 17.6%를 경제적 피해 허용 수준으로 설정하였다. 오이 흰가루병 방제적기는 경제적 피해 허용수준과 시뮬레이션 결과를 종합할 때 흰가루병으로 발병된 잎이 $1{\sim}2$장일 때 방제를 시작해야 하는 시점으로 생각된다.

• 농약과학회지
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• 제18권3호
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• pp.175-180
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• 2014

비트에서 흰띠명나방의 경제적 피해수준과 경제적 피해허용수준을 설정하하기 위한 연구를 수행하였다. 2010년도 8월 하순에 비트를 정식하였으며 흰띠명나방 2령 애벌레 밀도를 달리하여 접종한 후 생육시기별로 피해엽률을 조사하였다. 10주를 한 반복으로하여 각 처리구당 3반복으로 실험하였다. 비트에서 흰띠명나방의 피해엽률은 접종마리수가 증가함에 따라 피해엽률도 증가하였으나 10월 초순경에 감소하다가 하순경에 다시 증가하였다. 흰띠명나방 애벌레밀도는 초기 접종밀도가 높을수록 증가하였고, 9월 중순부터 감소하다가 10월 중순에 다시 증가하였다. 흰띠명나방 접종밀도가 증가할수록 비트 잎의 수확량과 상품률이 감소하였으며 이에 따라 수량감소율은 증가하였다. 흰띠명나방 유충을 접종한 후 3회에 걸쳐 잎을 수확하여 얻은 접종밀도(x)와 수량감소율(y1)과의 관계식은 y1 = 1.226x + 3.36이였으며 최종적으로 수학한 뿌리의 수량감소율(y2)과의 관계식은 y2 = 0.478x + 1.15이었다. 따라서 잎의 경제적 피해수준은 10주당 1.3마리, 경제적 피해허용은 1.1마리였으며, 뿌리의 경제적 피해수준은 10주당 8.1마리, 경제적 피해허용수준은 6.4마리로 설정되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.1316-1318
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• 2002

A methodology for reliability and economic analysis of wind embedded electric power system is presented in this paper. This is done by evaluating the reliability index, loss of load expectation (LOLE), for the power system with and without integration of wind system in the overall electric power system. Economic analysis of the wind energy embedded electric system is done in terms of conventional fuel saving assessment due to the use of wind power generation units.

• 한국국방경영분석학회지
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• 제28권1호
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• pp.136-149
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• 2002

The UAV(Unmanned Aerial Vehicle) offers numerous benefits to the military. The benefits it can provide are to perform an operation without loss of life and economic life cycle cost. This clearly showed us the benefits of using UAVs in the operation, especially in politically hostile and sensitive areas. While the American military first used UAVs, it is Israel that has used them best in real situations. In this paper, it is summarized the types and the OPCONs (Operational Concept) of UAVs and the values. Looking at the technology trends, and it is showed the benefits of UAV in the economic side feasibility, to emphasis on the future values of the UAVs as a newly emerging weapon systems.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 A
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• pp.36-38
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• 1993

This study considers the economic aspect of the distribution automation system, which is the decision-making criteria of the electric utilities for the investment. The feeder automation candidate region is divided into two types of the urban and the rural. The total investment cost of the feeder automation for each type is estimated. The annual cost, is also estimated, by finding the fixed charge rate. To compare the annual cost and the economic effect cost, for the investment decision-making, the costs are quantitatively estimated on the following effects : the manpower replacement, the outage cost saving, the main transformer utilization improvement, the feeder utilization improvement, and the line loss reduction.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 A
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• pp.192-194
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• 1993

This paper presents an efficient method for determining the economic dispatch of thermal generator using an alternative Jacobian matrix considering system constraints. The transmission loss is approximately expressed as a funtion of generating powers and the generalized generation factor. From this expression, the Jacobian matrix is formulated and solved by the Newton Raphson Method. In this method, the economic dispatch problem is solved rapidly without calculating the penalty factor. The proposed method has fast convergency characteristic and good accuracy. The feasibility of this method is demonstrated by means of examples.

• 조명전기설비학회논문지
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• 제29권5호
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• pp.94-99
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• 2015

Prediction algorithm of the energy storage system in accordance with the load pattern can cause economic loss in case of a failure prediction. In addition, algorithm that uses TOU(Time of Use) based on the revelation by the power electric charge which covers most simply is an inefficient operation because it is only for the purpose of reducing the peak power. In this paper, we introduced a non-prediction algorithm with a conventional TOU in order to solve this problem operating the energy storage system economic and efficient.

• East Asian Economic Review
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• 제27권2호
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• pp.115-143
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• 2023

In this paper, we address how the monetary authority should react to financial market status and exchange rate movements in a small open economy New Keynesian model with financial frictions due to asymmetric information between savers and borrowers. We show that the small economy with financial frictions is more susceptible to the exogenous shocks under the fixed exchange rate regime than under the flexible exchange regime. The small economy experiences a more prolonged and deeper economic recession under the fixed exchange rate regime than under the flexible exchange rate regime. The monetary policy taking into account external finance premium is better than the interest rate rule without considering the financial market status.

• Structural Engineering and Mechanics
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• 제85권4호
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• pp.461-468
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• 2023

Edible coatings are one of the most innovative methods to preserve the quality and increase the shelf life of fresh fruits and vegetables. A successful edible coating should have a barrier against gases, especially oxygen and water vapor, and have good surface characteristics. Today, chitosan coating is widely used due to its properties, such as non-toxic, biodegradable, and biocompatibility. Is. Coating the surface of fruits and vegetables with chitosan increases shelf life due to reducing weight loss and reducing respiration rate and also reduces decay due to its antimicrobial and anti-fungal effect. This work discusses the effect of using chitosan coating containing chamomile extract to increase fresh vegetables'shelf life. In addition to increasing the shelf life of vegetables, this method can be used as a solution for the economic management of human resources. The results of this method confirm the successful synthesis of these nanoparticles, and the results of applying this food coating on vegetables have been successful. They have increased the shelf life of vegetables such as basil and spinach.

• 농업과학연구
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• 제49권4호
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• pp.737-747
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• 2022

The purpose of this study is to analyze farmers' perceptions of Greenhouse Gas Reduction Projects and identify factors influencing participation in the projects. To achieve the research objective, a survey was conducted and a probit model was adopted for the empirical analysis. The results showed that farmers do not participate in the projects due to a lack of education and promotion and due to economic loss. It also showed that the frequency of training and technical guidance learning, degree of recognition of the need for efforts to reduce greenhouse gases, and the level of recognition of the projects concerned have a positive impact on the willingness to participate in the projects. Meanwhile, participation in agricultural environment conservation programs has a negative impact on it. Enhancement of education and promotion as well as economic support (direct payment, R&D) would be useful to raise the willingness to participate in the projects.