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양승룡 ( Seung Ryong Yang ) 한국농업경제학회 2003 農業經濟硏究 Vol.44 No.2
N/A A widespread belief in the livestock industry in Korea is that the feed price is largely affected by the prices of feed grains which are mostly supplied from abroad. It is also believed that the large dependency of feed grains on foreign sources results in weak international competitiveness. This article conducts causality tests between prices of corn and feed and between prices of feed and livestock. No statistical evidence is found to conclude that the international com price affects domestic feed prices. Rather, the exchange rate could explain the food price movements. In addition, the feed price does not appear to affect the livestock prices. Interpretations of the results and implications for the future work is outlined in the conclusion.
양승룡 ( Seung-ryong Yang ),구지영 ( Jiyoung Ku ) 한국농업정책학회 2007 농업경영정책연구 Vol.34 No.2
Huge price variation is the most damaging risk to the vegetable farms. The Korean government has recently remodelled the vegetable price stabilization policy to make it more attractive to farmers and cost efficient. The objective of this study is to evaluate the effectiveness of the new policy mechanism and seeks ways to improve. To this end we interpret the policy as a range forward which is composed of two options and conducted the Monte Carlo simulation. The results show that the new mechanism can improve farmer`s benefit, but there still is some room for more improvement.
양승룡 ( Yang Seung-ryong ),김건아 ( Kim Kun A ) 한국식품유통학회 2020 한국식품유통학회 학술대회 Vol.- No.하계
최근 편의성을 강조한 신선편이 농산물 시장이 급격하게 성장하고 있으나, 과도한 이윤 추구로 인한 높은 시장 가격은 시장 성장의 장애 요소로 작용하고 있다. 이에 본연구는 신선편이 농산물의 구매행태를 분석하고, 신선편이 농산물의 적정가격을 분석하기 위해 소비자 지불의사를 분석하였다. 분석 결과, 주요 구매 이유로는 적당량 구매, 쓰레기처리 용이, 조리시간 단축 등이며, 미구매 이유는 높은 가격, 식품 안전 우려, 짧은 유통기간 등이 있었다. 소비자 지불의사는 구매 경험에 따라 차이가 발생하며, 전처리 단계별로 차이가 있는 것으로 나타났다. 또한, 신선편이 농산물 판매가격과 소비자 지불의사 간의 차이가 발생하는 것으로 분석되었다.
진화학습을 이용한 다중에이전트의 일반화 성능향상을 위한 전략적 연합
양승룡(Seung-Ryong Yang),조성배(Sung-Bae Cho) 한국정보과학회 2004 정보과학회논문지 : 소프트웨어 및 응용 Vol.31 No.2
사회시스템이나 경제시스템 같이 동적으로 변하는 시스템에서는 그 구성원들 간에 복잡한 상호작용(행동)이 나타나게 되는데 구성원들의 행동은 변화하는 환경에 따라 적응하는 경향을 보인다. 그리고 이들의 행동양상은 흔히 생물학 분야의 조건반사에 비유되기도 한다. 본 논문에서는 복잡한 사회 현상을 모델링하고 분석하기 위하여 반복적 죄수의 딜레마 게임상에서 에이전트들의 전략적 연합을 통하여 변화하는 환경에 잘 적응하는 일반화 능력이 우수한 에이전트들을 자동 생성하는 방법을 제안한다. 또한 에이전트에 신뢰도를 부여하여 연합의 의사결정에 참가하게 함으로써 일반화 성능을 향상시키는 방법을 소개한다. 실험결과, 전략적 연합을 이용하여 진화된 에이전트들은 테스트 에이전트들에 비하여 일반화 성능이 우수함을 확인할 수 있었다. In dynamic systems, such as social and economic systems, complex interactions emerge among its members. In that case, their behaviors become adaptive according to changing environment. In many cases, an individual's behaviors can be modeled by a stimulus-response system in a dynamic environment. In this paper, we use the Iterated Prisoner's Dilemma (IPD) game, which is simple yet capable of dealing with complex problems, to model the dynamic systems. We propose strategic coalition consisting of many agents and simulate their emergence in a co-evolutionary learning environment. Also we introduce the concept of confidence for agents in a coalition and show how such confidences help to improve the generalization ability of the whole coalition. Experimental results are presented to demonstrate that co-evolutionary learning with coalitions and confidence allows better performing strategies that generalize well.
한국 농산물 수입시장에서 주요 수출국의 시장지배력 분석
양승룡(Seung Ryong Yang),이원진(Won Jin Lee) 한국농업경제학회 2001 農業經濟硏究 Vol.42 No.1
Korea relies more than 70 percent of food supply on a limited number of exporting counties. If the suppliers possess market power, the food security matters. This study tested whether the major exporting countries of corn and wheat have power of determining market prices and enjoy oligopolistic profit in Korea. The empirical results indicate that Korea shows a high degree of import loyalty toward U.S. products. It is evident that the U.S. and Australia have market power in the wheat market, while no distinct power is detected in the com market. The result for the corn market seems to reflect the severe price competition between the two major exporters, the U.S. and China. It is also shown that the launch of the WTO does not significantly change the structure of market power in the markets considered. The results of this study suggest that it is important to diversify import sources and to use futures contracts and long-term agreements to enhance food security.
양승룡(Seung Ryong Yang),손용석(Young Seok Sohn),박선동(Sun Dong Park) 한국수산경영학회 2001 수산경영론집 Vol.32 No.1
While the electronic commerce (EC) applies to most products, whether digitized or not, the EC for fisheries does not seem very successful. Many reasons lie behind this. However, insufficient and/or inconsistent legal and institutional provisions and lack of adequate government supports should be an immediate concern. This study identifies and analyzes problems with the current electronic commerce and trade for fisheries, and suggests institutional provisions and policies for successful expansion of the newly introduced marketing and distribution system.