• 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.

• The Journal of the Acoustical Society of Korea
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• v.15 no.2
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• pp.95-100
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• 1996

In this paper, we present an image coder using variable quantizer for newly proposed JPEG extensions which has been standardized as ISO/IEC 10918-3(ITU-T Rec. T.84). It is necessary to alleviate the blocking artifact which is more sensitive to human eye in view of the spatial frequency sensitivity. The blocking artifact arises in the lower activity area rather than in the higher area. Therefore variable quantizer use the horizontal and vertical derivatives for calculating the $8{\times}8$ block activity. We classified nonlinear quantizer parameter into 5 categories in order to finely quantize in the lower active region. As a result of simulation for various images, the proposed coder increases subjective and objective quality at a given bit rate.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.11a
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• pp.63-68
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• 2004

본 연구는 우리나라 유리건축에서 적용되고 있는 유리투과체를 조사하여 투과율이 다른 4종류 즉, 투명유리, 색유리, 파스텔유리, 로이유리를 선정하여 복층유리로 제작하였다. 투과체에 따른 실내공간의 채광성능평가를 위하여 축소모형을 1/10으로 제작하였으며, 투과체의 구성을 일반형과 이중분할형으로 구성하여 기준실과 실험실에 설치하였다. 또한, 채광성능평가시 IEA모니터링 프로토콜을 적용하여 작업면, 벽면, 천정면에 대하여 조도를 외부조도와 동시에 측정하였고, 본 논문에서는 작업면에 대한 채광성능평가를 중심으로 분석하였다. 평가지표로서 주광조도비를 사용하였으며, 일반형과 이중분할형에 대한 가변 유리투과체를 변화시켰을 경우 투과율에 따른 실내공간의 채광성능을 평가하였다. 가변 유리투과체로 구성된 실내공간의 채광성능평가는 다음과 같이 분석되었다. 첫째, 실내공간에 일반형을 적용하여 서로 다른 투광성능을 가진 유리투과체가 적용된 경우 외부조도에 대한 내부조도 비율은 투과율이 증가할수록 일정하게 증가하는 것으로 나타났다. 이는 투과체가 갖는 투과성능의 영향으로 판단된다. 둘째, 일반형에 비해 이중분할형은 채광창으로 유입되는 채광학적 기여가 증가하여 실 전체의 조도를 증가시키며 특히, 실 중간부와 후면부의 경우 채광적 잠재력이 증대되어 실의 쾌적함과 시 환경적 질이 증대될 것으로 사료된다. 현재 유리건축물에 많이 적용되고 있는 저 투과체에 이중분할형을 적용할 경우 채광학적으로 많은 효과가 있을 것으로 기대된다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.244-246
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• 2002

최근 무선 인터넷과 핸드폰, PDA, HPC 등과 같은 모바일 장치의 발전으로 인하여 이동체의 위치를 중심으로 하는 LBS가 점차적으로 많은 분야에서 사용되고 있다. 이동체의 위치 데이타는 GPS와 같은 위치 측정 시스템을 이용하여 대용량으로 발생하게 되는데 기존의 정적인 데이타를 처리하기 위한 GIS를 사용하여 이러한 데이타를 처리하는 것은 비효율적이다. 그러므로, 본 논문에서는 이러한 동적인 데이타를 효과적으로 처리할 수 있는 LBS를 위한 실시간 GIS 엔진을 설계 및 구현하였다. 본 논문에서의 실시간 GIS 엔진은 LBS에서 필요한 공간, 비공간, 위치 데이타를 효과적으로 관리할 수 있다. 실시간 GIS 엔진은 인터페이스 관리자, 질의 관리자, 인덱스 관리자, 데이타 로더, 레이어 관리자, 위치 데이타 관리자, 메타 데이타 관리자, 객체 관리자로 구성되어 있으며 기존의 HP 실시간 데이타베이스 시스템에 공간 데이타 타입, 공간 연산자, 가변 길이 데이타 처리, 테이블 자동 확장 기능 등을 추가하여 LBS에서 사용되는 대용량 가변 길이 데이타를 효과적으로 처리할 수 있도록 하였다.

• Spatial Information Research
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• v.18 no.5
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• pp.13-26
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• 2010

In this paper, a dynamic variable window-based topographical classification method is proposed which has the changeable classification units depending on topographical properties. In the proposed scheme, to im prove the classification efficiency, the unit of topographical classification can be changeable dynamically according to the topographical properties and repeated patterns. Also, in this paper, the classification efficiency and accuracy of the proposed method are analyzed in order to find an optimal maximum decision window-size through the experiment. According to the experiment results, the proposed dynamic variable window-based topographical classification method maintains similar accuracy but remarkably reduce computing time than that of a fixed window-size based one, respectively.

• Journal of the Korean Society for Marine Environment & Energy
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• v.12 no.1
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• pp.15-22
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• 2009

Auto-navigation algorithm have been studied to avoid collision and grounding of a ship due to human error. There have been many research on collision avoidance algorithms but they have been validated little on the real coastal traffic situation. In this study, a Collision Avoidance algorithm is developed by using Fuzzy algorithm and the concept of Changeable Action Space Searching (CAS). In the first step, on a basis of collision risk calculated from fuzzy algorithm in the current time(t=to), alternative Action Space for collision avoidance is planned. In the second step, next alternative Action Space for collision avoidance in the future($t=to+{\Delta}t$) is corrected and re-planned with re-evaluated collision risk. In the third step, the safest and most effective course among Action Space is selected by using optimization method in real time. In this paper, the main features of the developed collision avoidance algorithm (CAS) are introduced. CAS is implemented in the ship-handling simulator of MOERI. The performance of CAS is tested on the situation of open sea with 3 traffic ships, whose position is assumed to be informed from AIS. Own-ship is fully autonomously navigated by autopilot including the collision avoidance algorithm, CAS. Experimental results show that own-ship can successfully avoid the collision against traffic ships and the calculated courses from CAS are reasonable.

• Korean Journal of Optics and Photonics
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• v.10 no.2
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• pp.152-156
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• 1999

We have developed the pulse-width variable Quenched Dye Laser (QDL). QDL consisted of the dye cell of 5 mm length containing a $2.5{\times}10^{-3}$[mol/l] solution of Rhodamine 6G and the cylindrical lens focal length of 150 mm and quenching mirror. QDL system was pumped by s XeCl excimer laser with 150 mJ pulse energy in a 20 ns pulse at 1 Hz repetition rate. Pulse-width of QDL was measured by a noncollinear intensity autocorrelator. The focused thckness was measured by changing the position of the focusing cylindrical lens. Pulse-width of QDL as a function of the focused thickness (273.0${\mu}{\textrm}{m}$~845.0${\mu}{\textrm}{m}$) varied continuously from 86 ps to 201 ps.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.259-267
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• 2019

As the change in social awareness regarding cats is consistent with the lifestyle of modern people who seek an independent life, the number of cats owned as a pet and its market will continue to increase. The compainion animals are not just pets to pet owners, but people communicate with their pets and the pets have begun to be recognized as a member of their family. Although the pet industry has been steadily growing and the number of cats owned by households is rapidly increasing, there is a lack of study on products based on understanding the characteristics and behavior of cats. The purpose of this study is to propose a versatile furniture design considering the behavior characteristics of cats. The versatile furniture that is easy to move and rearrange according to necessity and the environment of residential space always pays to make better use of the space. We would like to propose versatile furniture that can satisfy the aesthetic pleasures of cats and can be used as furniture at the same time depending on purpose and situation. This study aims to develop the design of furniture that can make a better environment for pets and pet owners, an it is expected to be a basic study of furniture design for them.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.210-212
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• 1999

공간 데이터베이스 시스템에 관한 연구는 다양한 분야에서 진행되고 있으며 특히 공간 데이터베이스 시스템의 가장 중요한 응용인 지리정보시스템에 대한 연구가 중점적으로 이루어지고 있다. 지리정보시스템에서 이용되는 공간 객체는 Point, Lie, Region 등으로 분류되며 불규칙한 n차원의 가변 길이 속성을 가진다. 이는 또한 공간 객체간의 위상 관계와 위치 정보를 포함하여야 한다. 본 논문에서는 기존의 저장구조를 용이하게 확장 가능할 수 있도록 하는 관계표현을 이용한 공간 객체 데이터 구조를 제안한다. 제안된 구조는 공간 데이터와 속성 데이터를 효율적으로 연결시키며 공간 위상 관계를 유지하고 관리한다. 이는 도한 레이어 구조에서 관리되는 데이터에 의하여 공간 객체 간의 일관성을 유지시킨다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.6
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• pp.360-371
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• 2016

Paul Rudolph's early work in Florida after World War II is a significant example of the regional transformation of typical Modern Architecture through the spatial composition based on the diversity and use of local material and construction methods. Paul Rudolph's concept of a Florida House design is the expression of regional material, construction, and structural system through the spatial extension & connection based on periodical, regional characteristics. The characteristics of the Florida works is the spatial extension & connection design based on the wood structural framework through the various design factors, such as a screen roof, open roof, and internal patio as the spatial extension and link method. Paul Rudolf designed the house using local materials, such as cypress wood and lime block produced near the Florida Area and provided details & technology considering the Florida climate and construction environment. Through studies of Paul Rudolph's Florida works, the Florida Houses can be a prototype of localization, and can be presented as the spatial & technical transformation of design by the historical, cultural, regional background.