• 대한수학회논문집
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• 제27권2호
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• pp.425-430
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• 2012

In this paper, we will prove a social equilibrium existence theorem of a generalized Nash game with affine constraint correspondences which is comparable with Nash's equilibrium existence theorem in several aspects.

• 호남수학학술지
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• 제35권2호
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• pp.225-234
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• 2013

Many studies of experimental economics have produced outcomes which contradict the predictions of Nash equilibrium, which relies heavily upon the premise of selfishness of an individual. In the games involving contexts of social conflicts represented by the prisoners' dilemma game, the experiments yields outcomes quite different from what are predicted by the conventional wisdom. In order to fill this gap between the conventional Nash Equilibrium and experimental outcomes, non-selfish (or other-regarding) motives of human behavior are introduced and then a new equilibrium concept, RAE-equilibrium is developed. It is also proved that an RAE-equilibrium exists under quite general conditions. Then it is applied to the prisoners' dilemma game that some of the experimental outcomes can be explained.

• 충청수학회지
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• 제23권4호
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• pp.691-698
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• 2010

In this paper, we first introduce a new model of strategic Nash game with insatiability, and next give two social equilibrium existence theorems for general strategic games which are comparable with the previous results due to Arrow and Debreu, Debreu, and Chang in several aspects.

• 한국보건간호학회지
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• 제26권3호
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• pp.428-439
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• 2012

Purpose: The purpose of this study was to define and clarify the concept of 'equilibrium' in community-dwelling elderly persons with chronic diseases. Methods: A hybrid model was used for development of the concept of equilibrium. The model included a field study conducted in Seoul, Korea. Participants in this study included 12 elderly persons with chronic diseases who were taking medicine regularly. Results: The concept of equilibrium was found to be a complex phenomenon having meaning in two dimensions: the family-friendly and social relation-oriented dimensions. Four attributes and nine indicators were defined. Conclusion: Equilibrium was defined as the state of having health recognition, will power, and motive power (family-friendly dimension) and having a feeling of participation (social relation-oriented). Therefore, nurses who work with elderly persons with chronic disease in the community should be aware of the attributes and indicators of equilibrium in order to enhance the equilibrium of their elderly clients with chronic diseases.

• Journal of Electrical Engineering and Technology
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• 제9권1호
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• pp.90-97
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• 2014

Nash Cournot Equilibrium (NCE) has been widely used in a competitive electricity market to analyze generation firms' strategic production quantities. Congestion on a transmission network may lead to a mixed strategy NCE. Mixed strategy is complicated to understand, difficult to compute, and hard to implement in practical market. However, Stackelberg model based equilibrium does not have any mixed strategy, even under congestion in a transmission line. A guide to understanding mixed strategy equilibrium is given by analyzing a cycling phenomenon in the players' best choices. This paper connects the concept of leader-follower in Stackelberg model with relations between generation firms on both sides of the congested line. From the viewpoint of social welfare, the surplus analysis is presented for comparison between the NCE and the Stackelberg equilibrium (SE).

• Journal of applied mathematics & informatics
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• 제5권3호
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• pp.607-614
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• 1998

In this note we shall give a new existence theorem of equilibrium in social systems with coordination under general assump-tions by using the Kakutani fixed point theorem.

• East Asian mathematical journal
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• 제34권3호
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• pp.317-330
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• 2018

We develop a mathematical model for the obesity dynamics to investigate the long term obesity trend with the consideration of psychological and social factors due to the increasing prevalence of obesity around the world. Many mathematical models for obesity dynamics adopted the modeling idea of infectious disease and treated overweight and obese people infectious and spreading obesity to normal weight. However, this modeling idea is not proper in obesity modeling because obesity is not an infectious disease. In fact, weight gain and loss are related to social interactions among different weight groups not only in the direction from overweight/obese to normal weight but also the other way around. Thus, we consider these aspects in our model and implement personal weight gain feature, a psychological factor such as body image dissatisfaction, and social interactions such as positive support on weight loss and negative criticism on weight status from various weight groups. We show that the equilibrium point with no normal weight population will be unstable and that an equilibrium point with positive normal weight population should have all other components positive. We conduct computer simulations on Korean demography data with our model and demonstrate the long term obesity trend of Korean male as an example of the use of our model.

• 사회경제평론
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• 제31권3호
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• pp.131-163
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• 2018

경제의 장기균형은 경제에 존재하는 모든 기업들이 '초과이윤 = 0'의 조건을 충족하는 상태이다. '다른 모든 변수들이 불변'(ceteris paribus)이라는 가정에 근거한 전통적 부분균형분석은 장기균형과 논리적으로 상충한다. '산업완결균형'(full industry equilibrium)은 전통적인 부분균형분석보다 포괄적인 부분균형의 틀 속에서 개별 산업의 장기균형을 다룬다. 산업완결균형에 대한 비교정태분석은 개별 기업/산업에 대하여 기존의 부분균형분석이 도출하는 결과들이 성립하지 않을 수 있음을 보인다. 본 논문은 산업완결균형의 배경과 의의를 소개한다. 이 과정에서 산업완결균형 분석과 1960-70년대의 자본논쟁이 갖는 유사점과 상이점을 논의하고, 산업완결균형 분석의 비판적 의의와 건설적 의의를 밝힌다.

• 농업과학연구
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• 제47권2호
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• pp.283-290
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• 2020

In 2018, 647 thousand tons of eggs were produced and consumed. However, the issue of pesticides used for egg in 2017 made Korean consumers worry about the food safety of eggs, and the volume of egg consumption decreased. The Korean egg industry also has another problem due to an unclear and inefficient marketing structure at the farm level. This marketing situation of eggs at the farm level in Korea needs a large-scale restructuring of the market structure, including introducing an EPC (egg processing center). Especially, the introduction of an EPC has been discussed by government officers and specialists, but the social benefit of an EPC, which will be the driving point for approving an EPC, has not been measured yet. The purpose of this study was to measure the effect of introducing an EPC in Korea. Through an analysis using EDM (equilibrium displacement model), a few findings are presented. First, the introduction of an EPC may increase the transparency of price discovery and decrease the transaction cost. And thus, it results in a higher producer price, lower consumer price, and larger quantity at market equilibrium. Second, an EPC will improve the level of food safety of eggs, which can increase the satisfaction of domestic producers and consumers. Third, the introduction of an EPC may create new consumption of eggs. Based on these three effects, the new social benefits in monetary terms from the introduction of an EPC in Korea could be 23.9 - 35.2 billion won.

• 대한수학회보
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• 제38권3호
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• pp.565-573
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• 2001

In this paper, we first rove the strict quasi-concavity of maximizing function, and next prove a new maximum theorem using Fan’s generalization of the classical KKM theorem. Also an existence theorem of social equilibrium can be proved when an additional assumption on the constraint correspondence is assumed. Finally, we give illustrative two examples of constrained optimization problems.