• 한국정밀공학회지
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• 제23권9호
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• pp.84-91
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• 2006

The synthesis of optimal controllers for multivariable systems usually requires an accurate linear model of the plant dynamics. Real systems, however, contain nonlinearities and high-order dynamics that may be difficult to model using conventional techniques. This paper presents a novel loaming method for the synthesis of LQR controllers that doesn't require explicit modeling of the plant dynamics. This method utilizes the sign of Jacobian and gradient descent techniques to iteratively reduce the LQR objective function. It becomes easier and more convenient because it is relatively very easy to get the sign of Jacobian instead of its Jacobian. Simulations involving an overhead crane and a hydrofoil catamaran show that the proposed LQR-LC algorithm improves controller performance, even when the Jacobian information is estimated from input-output data.

• 대한기계학회논문집A
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• 제32권12호
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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.

• 한국시스템다이내믹스연구
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• 제10권1호
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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.

• 한국시스템다이내믹스연구
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• 제12권3호
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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.

• 한국수산과학회지
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• 제49권6호
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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.

• 한국분무공학회지
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• 제22권2호
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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.

• 한국가정과학회지
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• 제4권2호
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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.

• 한국시스템다이내믹스학회:학술대회논문집
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• 한국시스템다이내믹스학회 2002년도 추계학술대회발표논문집
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• pp.59-100
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• 2002

본 연구는 공여 된 신지가 기업회생에 어떠한 영향을 미치고 어떠한 역할을 하는지 시스템 다이내믹스 모형 개발과 시뮬레이션을 통해서 검증한다. 국내 기업회생 사례연구를 통해서 어떻게 조직시스템이 공여 된 신지에 반응을 하는지를 알아보고 공여 된 신뢰와 기업회생에 관한 관계를 수리적으로 모형 화한다. 그리고 공여 된 신지가 어떻게 조직시스템을 위기의 상황에서 다시 회생하도록 움직이는지 알아보기 위해서 시스템 다이내믹스 모형을 개발한다. 모형은 '문제의 발생-해결' 의 관점에서 구축하였고, 공여 된 신뢰에 대한 선행이론으로 귀인이론, 위지 커뮤니케이션을 통한 위기공유를 도출하였다. 본 연구는 시뮬레이션 결과를 통해 공여 된 신지가 기업회생의 새로운 조건이라는 사실을 검증함으로써 기업회생의 동태적 과정에 대한 이론적 통찰과 실무적 시사점을 제공한다.

• 경영과정보연구
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• 제38권1호
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• pp.121-139
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• 2019

본 연구는 고객-종업원 간 관계의 발전에 따라 서비스 산업에서 필수적으로 요구되는 고객참여(CP)의 변화를 종단자료에 의해 잠재성장모형으로 분석하여 고객참여의 변화를 확인하고자 하였다. CP가 관계속에서 이해될 필요가 있다는 사실에 기초하여 본 연구에서는 관계의 발전에 따른 CP의 변화를 확인하고자 하였다. 관계의 역동성을 고려하여 CP가 관계속에서 변화하는 궤적을 종단자료를 통해 밝힘으로써 기존의 횡단적 연구의 한계를 극복하고자 하였다. 또한 관계속에서 어떤 변수들이 고객참여의 변화를 촉진할 수 있는 지에 대해 살펴보고자 하였다. 연구의 결과, 잠재성장모형을 통해 분석한 CP는 관계의 발전에 따라 유의하게 변화하는 것으로 나타났다. 이것은 CP가 관계속에서 이해될 필요가 있다는 사실을 확인한 것이라고 말할 수 있다. 또한, 관계지향성과 의존성은 CP의 초기값에는 긍정적으로 유의하게 영향을 미치지만, CP의 변화를 촉진하는 것으로는 규명되지 못하였다. 결론적으로, 관계의 역동성을 고려한다면, CP 역시 역동적이라는 사실을 인지해야 한다. 본 연구는 횡단적이고 조각적인 CP에 대한 이해에서 벗어나 CP가 역동성을 지니고 있음을 이해하고 이를 통해 서비스기업의 고객관리 프로그램이 운영될 필요가 있음을 지적하고자 하였다. 관계의 변화와 발전에 따라 CP를 유도하는 전략이 달라져야 하며, 이를 통해 관계발전단계별 적절한 CP의 수준이 달성될 수 있는 서비스접점의 성공을 이끌어낼 수 있게 되는 것이다.

• 한국연극학
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• 제40호
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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.