• Transactions of the Korean Society of Mechanical Engineers A
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• v.32 no.12
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• pp.1047-1054
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• 2008

In this paper, the molecular dynamics (MD) simulations are performed with single-crystal copper blocks under simple shear and simple tension to investigate the effect of size and crystal orientation. There are many variances to give influences such as deformation path, temperature, specimen size and crystal orientation. Among them, the crystal orientation has a primary influence on the volume averaged stress. The numerical results show that the volume averaged shear stress decreases as the specimen size increases and as the crystal orientation changes from single to octal. Furthermore, the Schmid factor and yield stress for crystal orientation are evaluated by using the MD simulation on the standard triangle of stereographic projection.

• Korean System Dynamics Review
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• v.10 no.1
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• pp.97-107
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• 2009

In this paper, a structural similarity between traditional oriental philosophy and systems thinking is discussed. The polarity of causal relationship and feedback loops can be interpreted in terms of yin and yang of oriental philosophy. A positive feedback loop which is linked to the yang is a force or mechanism that accelerates changes in systems. A negative feedback loop which is linked to the yin can be interpreted as a force oppressing any changes. In this sense, systems thinking can be related to the oriental philosophy. With this linking pin between them, systems thinking can be introduced and educated more friendly in oriental society. Furthermore, systems thinking can get a set of rich insights from the oriental philosophy. This paper suggests a linking leverage between systems thinking and oriental philosophy.

• Korean System Dynamics Review
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• v.12 no.3
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• pp.5-23
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• 2011

Studies in social science are performed on the language of social actors. While a metaphor analysis focuses on the meaning of the language, a cognitive map analysis deals with its external relationships. If we can put together both analyses, it will be possible to investigate the internal meanings and external relationship of the language and image at the same time. In this paper, metaphor analysis and cognitive map approach is applied to find the image of local governments. This study shows how to link metaphor analysis to the cognitive map and the benefit of using both approaches together.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.49 no.6
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• pp.815-822
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• 2016

The cationic biopolymer chitosan has several applications in medicine. Chitosan is the deacetylated derivative of chitin, the second most abundant naturally occurring polymer. Recent studies have investigated the relationship between chitosan and antibacterial activity. However, the molecular interactions and mechanisms have not been detailed. This study used molecular dynamics simulations to study interactions between chitosan and anionic bacterial membranes (POPE-POPG) and electrically neutral non-bacterial membranes (POPC). We calculated the free energy using umbrella sampling to compare the interactions between membranes and chitosan in different protonation states. Fully protonated chitosan interacted most strongly with the bacterial membranes, but weakly with non-bacterial membranes. These results suggest that electrostatic interactions are the main mechanism of the antibacterial activity of chitosan, and they provide insights into the design of novel antibacterial and antimicrobial agents.

• Journal of ILASS-Korea
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• v.22 no.2
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• pp.55-61
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• 2017

This study has investigated the relationship between heat release fluctuations and the flow perturbations in a partially premixed gas turbine combustor using a commercial CFD code. Special focus of the current work is placed on the effect of equivalence ratio on the flame dynamics in a partially-premixed system. As the first step for this combustion dynamics study in the non-perfectly premixed combustor, flame behaviors are modeled and then compared with measured results under both steady and unsteady conditions. The calculated results of the flame transfer function with equivalence ratio fluctuation are found to well capture the main qualitative characteristics of the combustion dynamics for the partially-premixed flames.

• Korean Journal of Human Ecology
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• v.4 no.2
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• pp.29-47
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• 2001

The purpose of this study is to provide marital information that premarital preparation education program is to actively help families happiness, to be reinforced by the developmental service and the protective service. The premarital education program to help unmarried or premarital couples to begin initial adaptation for successful marriage. This program is to enrich the marital relationship provided with the wholesome, potent marital system as center of a family. and further to development preserve. enhance a healthy, genial family relationship. Particularly the elevated marital relationship. The data were collected for 122 collage students. The data were analyzed by statistical methods such as frequency percentage. This program is for college students as curriculum. So it was consisted of fourteen-sessions. The sessions included as follows: Intimacy & Love. Mate Selection. Understanding Together, Communication, Family Stress & Coping, Understanding Marriage & Family Dynamics. Gender Role & Power Intimacy. Sexuality & Relationship. Financial Management, Marriage Preparation. Evaluation.

• Proceedings of the Korean System Dynamics Society
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• 2002.11a
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• pp.59-100
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• 2002

This study examines the effect that the prepaid trust has in saving the troubled business through the development of a formal system dynamics model. Building on existing case studies of corporate turnaround. we develop a mathematical model on the relationship between the prepaid trust and turnaround. With it. we build a system dynamics model in order to show how the prepaid trust can shift an organizational system from fragile condition of a firm to resilient condition of a firm. The model, which is oriented by attribution theory and problem-sharing by crisis communication. is developed in the aspect of the process from 'clouds' to 'evaporating clouds' This study offers a new characterization of the conditions under which organizations may be recovered the performance by prepaid trust through simulations of the model, and provides both theoretical insights into the corporate turnaround and practical suggestions for those charged with corporate turnaround.

• Management & Information Systems Review
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• v.38 no.1
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• pp.121-139
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• 2019

This study aims to identify the change of customer participation(CP) which is essential to the service industry as the relationship between the customer and the employee develops. The latent growth modeling analysis based on the longitudinal data is utilized to examine the pattern of the change. This is based on the fact that CP needs to be understood in the relationship and is to confirm the change in CP by the development of the relationship. Given the dynamics of the relationship, we intend to overcome the limitations of previous cross-sectional researches by revealing the trajectory of CP in the relationship through the longitudinal data. We also want to examine which variables in the relationship can facilitate changes of CP. Research has shown that CP is significantly changed with the development of the relationship when we analyzed it through latent growth modeling. This confirms that CP needs to be understood in the relationship. In addition, 'relationship proneness' variable and 'dependence to provider' variable have positive effects on the initial values of CP, but they have not been established to promote the changes of CP. Consequently, when considering the dynamics of relationships, it is important to recognize that CP is also dynamic. This study sought to get out of the cross-sectional and fragmented understanding of CP that is dynamic. Through this, we would like to propose the successful operation of the customer management program of service firms in relation to CP. This will lead to the success of service encounter where appropriate CP levels at each stage of relationship development can be achieved.

• Journal of Korean Theatre Studies Association
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• no.40
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• pp.503-535
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• 2010

'Saiee', which could mean between, intra- and inter-, is a crucial topic in theatre as theatre has tension between actor and audience, reality and illusion, and everyday life and extraordinary life. Especially, it is interesting that the function of 'Saiee' is connected to extension and application of drama and theatre such as educational theatre, dramatherapy and applied drama/theatre. Such works are expected to educational or therapeutic effects, thus concern and support, demand and supply of these works is getting increased. However, it is true that researches on spirit, aesthetic and direction of these works are not sufficient, compared to quantitative increase and diversity. This study will explore Boal's Theatre of the Oppressed(TO from the below), which is key theory and technique of applied drama/theatre field with viewpoint of 'Saiee' theatre to look at spirit, aesthetic and direction of this field. Saiee's energy could observe the object with distance(distance), form the relationship with that object(inter) and create new circumstance through that relationship(intra). And Boal's TO tried to Saiee's theatre by using Saiee's dynamics variously. It bases on the phenomenon of metaxis. Boal's TO believes that drama/theatre is unique nature and ability of human being, that is to say, it is based on Homo Theatrum, human plays and does theatre. Therefore, the participant of Boal's TO is extended to everyone in everyday life. This activity is not only individual work to find his/her identity but also solidarity and possibility to change society which they belong to. It is the dynamics of 'Saiee' to make this possible. Boal's TO thinks that relationship and balance between individuality and sociality is important. The way of conversation in Boal's TO includes questioning, listening and communication. Unfamiliarity or distance of 'Saiee' makes interest in other people and question about them. Questioning through theatre and concern on other beings to search for the answer (this is listening), would be new relationship(and possibility) to extend him/herself. The communication and relationship leads to possibility and ability to create another world. This is the function of 'inter-' and 'intra-' in theatre of 'Saiee'. Lastly, it is various that Boal's TO as 'Saiee' theatre uses the dynamics of 'Saiee'. The diversity of technique comes from the application to humans in every moment and every time. To apply 'Saiee's aesthetic actively, concern and research on people 'now and here' should be proceed.

• Journal of the Korea Society for Simulation
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• v.29 no.4
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• pp.55-64
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• 2020

Since the European Union-South Korea Free Trade Agreement entered into force in 2011, the Korean automobile market has grown rapidly, resulting in intensifying competition among companies in the market. European automakers gained price competitiveness, which intensified competition with Korean automakers. In such a situation, various studies on the Korean automobile market have been conducted, but studies such as market influencing factor analysis and consumer analysis have mainly been conducted, and there is no research on the analysis of competitive dynamics in the market. In this study, the competitive dynamics between Hyundai Motors, Kia Motors, Mercedes-Benz, and BMW, which are major automakers in the Korean automobile market, are analyzed. The competitive relationship between major automakers are modeled using the Lotka-Volterra (LV) model and the competitive dynamics over time are analyzed by applying the Moving Window. In order to explain the competitive dynamics effectively, we analyze it by subdividing it based on various influencing factors.