• Proceedings of the Korean Institute of Interior Design Conference
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• 2004.11a
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• pp.46-49
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• 2004

A contemporary office space is changed by the transformation to an information-oriented society from an industrial society. A contemporary office space is recognized as an interactional space which is more of a mental and psychological space than a physical space. I studied the basic concept of an office space and the relationship of a social change and an office space on this study. I also studied the concept of an ubiquitous computing and the relationship of an ubiquitous computing and an office space. Through this study, we can establish the new concept of an office space to be applied to an ubiquitous concept. The ubiquitous concept of an office space will be brought into a new prototype of an office space, and then there is no more important to a physical place and time. The office space must be redesigned by an ubiquitous space nowadays.

• Journal of the Korean Chemical Society
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• v.57 no.2
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• pp.176-203
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• 2013

In this work is induced a new topology of solutions of chemical equations by virtue of point-set topology in an abstract stoichiometrical space. Subgenerators of this topology are the coefficients of chemical reaction. Complex chemical reactions, as those of direct reduction of hematite with a carbon, often exhibit distinct properties which can be interpreted as higher level mathematical structures. Here we used a mathematical model that exploits the stoichiometric structure, which can be seen as a topology too, to derive an algebraic picture of chemical equations. This abstract expression suggests exploring the chemical meaning of topological concept. Topological models at different levels of realism can be used to generate a large number of reaction modifications, with a particular aim to determine their general properties. The more abstract the theory is, the stronger the cognitive power is.

• Journal of the Chungcheong Mathematical Society
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• v.33 no.2
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• pp.237-253
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• 2020

This article studies asymptotic stability of non-auto nomous linear systems with time-dependent coefficient matrices {A(t)}_t∈ℝ. The classical theorem of Levinson has been widely used to science and engineering non-autonomous systems, but systems with defective eigenvalues could not be covered because such a family does not allow continuous diagonalization. We study systems where the family allows to have upper triangulation and to have defective eigenvalues. In addition to the wider applicability, working with upper triangular matrices in place of Jordan form matrices offers more flexibility. We interpret our and earlier works including Levinson's theorem from the perspective of invariant manifold theory.

• Proceedings of the KSME Conference
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• 2008.11b
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• pp.2256-2261
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• 2008

The electric snow melting and deicing system by electric heating cable which is adopted in this study is a part of road facilities to keep surface temperature of the road higher than freezing point of water for melting the snow or ice accumulated on it. The electric heating cables are buried under paved road at a certain depth and a certain pitch and operated automatically and manually. Design theory, amount of heating, and installation standard vary according to economic situation, weather condition, and installation place. A main purpose of this study is figuring out the appropriate range of required heat capacity and installation depth and pitches for solving snowdrifts and freezing problems with minimum electric power consumption. This study was performed under the ambient air temperature($-2^{\circ}C$, $-5^{\circ}C$), the pitches of the electric heating cables (200 mm, 300 mm), heating value ($250\;W/m^2$, $300\;W/m^2$, $350\;W/m^2$).

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.541-544
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• 2002

피치 (pitch)는 주파수와 관련된 인간이 실제 느끼는 음의 높이로 라우드니스 (loudness), 음색 (timbre)과 함께 소리의 음질을 결정하는 중요한 요소로 알려져 있다. 이러한 피치는 음성 해석 및 분리를 위해 많은 연구가 이루어진 반면 소음 분석 및 음질 향상을 위한 방향으로의 연구는 부족한 상황이다. 본 연구에서는 기저막 (basilar membrane)의 위치에 따른 주파수 분리 이론인 위치이론 (place theory)을 기본으로 한 기존의 가상 피치 (virtual pitch) 분석 알고리즘을 소음에 적용하기 위해서 수정하고, 절러가지 소음에 적용하였다. 본 연구에서의 알고리즘은 소음의 주파수 특성에 의존한 방법이기 때문에, 토널 (tonal) 성분이 존재하는 소음의 적용에는 적합한 결과를 나타냈지만, 그 이외의 소음에 대해서는 정확한 분석이 어렵다. 따라서 기본 주파수 (fundamental frequency)와 이와 관련된 고조파음(harmonics)이 음질에 중요한 영향을 미치는 소음의 음질 해석 린 음질 향상을 위해 본 연구의 알고리즘에 의한 피치 분석과 기존의 음질 인자를 적용하면 보다 효율적인 결과를 얻을 수 있을 것이다. 이런 소음의 예로는 엔진의 부밍 소음이나 기어 whine 소음 등이다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.8 no.12
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• pp.49-63
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• 1985

This paper is focused on the introduction of the types of models and explanation of the fundamental concepts and theory for development and use of the corporate planning and modeling system. Nowadays, a great deal of companies have been or experimenting with some form of a corporate planning and modeling system to support managerial and strategic decision making. From previous studies it was noted that most applications have tended to be financially based. This trend will probably continue. However, with the software and hardware currently available it is likely that companies will move more toward integrated models that link marketing, production, as will as financial areas. More emphasis will undoubtedly be placed on the use of econometric modeling, since this subelement of the overall planning and modeling process is closely tied to the market place and the economy. At any rate, wherever the development of corporate planning and modeling system is directed, clear understanding for the fundamental concepts and elements of the system is settled in advance in order to develope and use it.

• Proceedings of the KSR Conference
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• 2002.10a
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• pp.54-59
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• 2002

In general, the aluminum extrusions are used to the light construction of the high speed rail vehicle structures. However, the research works ok the crashworthy design of the high speed rail vehicle structures are not published sufficiently because the crash test of high speed rail vehicle structures costs high and is complicated. So, a method that can predict crash characteristics of a large size structure like a high speed tail vehicle should be suggested. In this study, the scale model studies are performed to predict the impact energy absorption characteristics of full scale model. In the first place, we verified the theory of scale law using FE-simulation from the crashworthiness point of view. Secondly, we performed the crush test using scale model, made of aluminum sub structure. As a result, we could predict the crash characteristics using scale model by 10∼20% error.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2005.05a
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• pp.235-236
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• 2005

Recently the small medical clinics designed well are appearing even in the small and medium city. Especially in the rural area, these clinics have the role not only as medical facilities but also as community place for their fellowship. This project was launched by order of a female doctor, an otolaryngologist. Her order is focused on otolaryngology but I also proposed the design alternatives such as plastic surgery and dental surgery clinic designed under the same conditions. This project was also related with the classwork of interior architecture course of our faculty and I tried to let the students understand the relation between theory and practice. The design goal was to join together harmoniously two stories which were completely separated and I consistently concentrated on the expression of immateriality and superimposition of space.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2008.05a
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• pp.220-225
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• 2008

Museum has been advanced according to the change of the society, playing a role of social education for people as a public place. However, many museum have limited which does not allow the museum to act various roles for public needs such as resting, entertaining, educating. Accordingly, this research has intention to solve the problem that the museum cannot satisfy public various needs by functional adaptation of the space; the theory of variable space. The objective of this research is to try to find the problems and solutions from museum space through research about Spatial variability and to analyze expression special quality of museum that is used as variable. Therefore, this research is to lay the foundation of Variable application technique of educational space of museum hereafter.

• Journal of Information Science Theory and Practice
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• v.6 no.1
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• pp.6-17
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• 2018

This paper confers about the implementation of Knowledge Management (KM) in the National Library of Bangladesh (NLB). The main aim of this study was to investigate how the NLB goes about creating, implementing, disseminating, and applying knowledge within the organization. The other objectives of this paper were to identify the current status of KM in NLB and the understanding of different facets of KM by the staff of the National Library. The paper revealed that the situation of KM in NLB is not satisfactory. The paper also described the fact that the working environment supports the implementation but there needs to be some changes in the policies. Finally the research disclosed that NLB is a great place for implementing KM and has a large amount of possibilities for the adoption of KM. This qualitative research used the questionnaire as the main instrument for data collection. Finally, data has been processed and analyzed using SPSS and MS Excel.