• Proceedings of the Korean Institute of Interior Design Conference
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• 2005.10a
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• pp.171-175
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• 2005

The Principle of space composition in modern architecture is thought about functionalism that based on function and program but the present age attempt that escapes form of former space composition. The present age brings fast development than former ages, so we need the space which has correct flexibility on New Age for escaping in existing structural formality. Specially, the space that boundary of existing plate, column and wall is crumbled as becoming possible technological support with social backgrounds. What this study saying is the analysis about the relation between the concept of topology and the consecutive space composition. Therefore, there is the purpose understanding a characteristic of continuity of the plate through the topological concept and understanding the roll in interior space.

• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.271-273
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• 2004

단백질의 기능은 단백질의 구조에 따라 결정되며, 새로운 단백질의 기능을 파악하기 위하여 이미 밝혀진 단백질의 기능과 구조를 비교하는 방법이 사용되고 있다. 단백질 구조를 비교하는 방법은 단백질 구조를 표현하는 방법에 따라 다양하게 개발되고 있으며, 보다 효과적으로 관련된 연구자들이 자신의 연구에 활용하기 위해서는 빠르고 쉽게 활용할 수 있는 인터페이스를 제공하는 도구가 필요하다. 본 논문에서는 PDB 데이터베이스에서 제공하는 단백질 정보를 이용하여 PSAML 및 Topology String 데이터베이스를 구축하고 이를 바탕으로 웹 기반에서 단백질 구조 비교를 보다 빠르고 효과적으로 수행하는 시스템에 대하여 기술한다. PSAML 데이터베이스는 단백질 구조를 단백질 이차구조 및 그들 사이의 관계를 포함하는 PSAML 데이터를 제공하며, Topology String 데이터베이스는 단백질 구조를 단백질 이차구조를 하나의 문자로 기술하여 아미노산 순서와 위상학적(공간적) 정보를 포함하는 문자열로 단백질 구조정보를 제공한다. 이를 이용하여 구축된 웹 기반 단백질 구조 비교 시스템은 Topology String 정렬 방법을 통하여 보다 빠르게 유사성이 높은 부분 구조를 찾는 방법을 제공한다.

• Journal of Korean Society of Transportation
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• v.11 no.3
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• pp.5-20
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• 1993

본고의 목적은 기존의 교통계획 모형이 가지는 제반 문제점을 GIS와 전문가체계를 교통계획과정에 통합함으로서 얻을 수 있는 편익을 살펴보는데 있다. GIS의 통합에서는 GIS network data를 교통계획모형의 network data로 변환하는 작업이 중추적인바 본고에서는 GIS의 위상학적 data 체계를 변환시킬 수 있는 방안이 제시되었으며, 전문가 시스템의 통합은 복잡한 교통계획 모형의 사용에 있어서 사용자와 대화를 통한 모형입력의 자동화와 교통계획과정에서 생겨나는 애매모호한 여러판단작업(judgmental issues)의 효율적 처리를 통해서 전체적인 교통계획과정을 쉽고 편리하게 하는 측면에서 검토되었다. 또한 양자의 통합을 계기로 전반적 계획과정에 feed back 기능을 부여함으로써 종래의 순차적인 모형에서 발생하는 문제점을 극복하려는 시도도 해 보았다. TranDASS(Transportation Decisio Aid and Support System)라는 PC상의 구현을 통해서 상기의 통합이 이루어졌으며 기존의 교통계획모형의 문제점을 해소하면서 특정도시 및 지역에 장.단기적 교통계획의 수립을 용이하게 할 것으로 보인다.

• Spatial Information Research
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• v.10 no.1
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• pp.107-122
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• 2002

Hydrological characteristics would be utilized to apply such as hydrologic modelling or basin management. This study is to extract hydrological characteristics through DEM and stream network analysis using a hydrologic unit map and digital topographic map in Milyang river basin. OEM and stream network was generated from digital topographic map. Especially stream network was allowed direction, stream order, and topology. As a result of the study, it shows that Milyang river has been changing geologically mature stage into old phase and the landform of Milyang river correspond to Horton-Strahler's law on morphology of stream. This methodology can be applicable to other areas related to hydrological characteristics with vector data.

• Investigative Magnetic Resonance Imaging
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• v.9 no.1
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• pp.36-42
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• 2005

Purpose : To develop a novel approach to calculate the sensitivity profiles of the phased array coil for use in non-uniform intensity correction. Materials and Methods : The proposed intensity correction method estimates the sensitivity profile of the coil to extract intensity variations that represent the scanned image. The sensitivity profile is estimated by fitting a non-linear curve to various angles of projections through the imaged object in order to eliminate the high-frequency image content. Filtered back projection is then used to compute the estimates of the sensitivity profile of each coil. The method was applied both to phantom and brain images from 8-channel phased-array coil and 4-channel phased-array coil, respectively. Results : Intensity-corrected images from the proposed method have more uniform intensity than those from the commonly used 'sum-of-squares' approach. By using the proposed correction method, the intensity variation was reduced to $6.1\%$ from $13.1\%$, acquired from the 'sum-of-squares'. Conclusion : The proposed method is more effective at correcting the intensity non-uniformity of the phased-array surface-coil images than the conventional 'sum-of-squares' method.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.11
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• pp.18-25
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• 2006

Unsteady aerodynamic force measurements were carried out in order to investigate the effects of phase difference of a dragonfly-type model with two pairs of wing. A load-cell was employed to measure the aerodynamic force generated by a plunging motion of the dragonfly-type model. The dragonfly-type model has a dynamic similarity with real one, and incidence angles of fore- and hind-wing are 0° and 10°, respectively. Other experimental conditions are as follows: The freestream velocity was 1.6 m/sec and corresponding chord Reynolds number was 2.88×103, and phase differences of fore- and hind-wing were 0°, 90°, 180° and 270°. The variation of aerodynamic coefficients during one cycle of the wing motion is presented. Results show that the lift is generated during the downstroke motion and the drag generated during the hind-wing‘s downstroke motion with the lift generation.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.24 no.3
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• pp.337-347
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• 2013

It is generally well-known that the inevitable high power electromagnetic wave affects the malfunction and disorder of electronic equipments and serious damages in electronic communication systems. Hence, it is necessary to take measures against high power electromagnetic(HPEM) wave for protecting electronic devices as well as human resources. The topological analysis based on Baum-Liu-Tesche(BLT) equation simplifying the moving path of electromagnetic and the observation points and Power Balance Method(PWB) employing statistical electromagnetic analysis are introduced to analyze relatively electrically large cavity with little time consumption. In addition to the PWB method, full wave results for cylindrical cavity with apertures and incident plane wave are presented for comparison with time-consumption rate according to the cavity size.

• Proceedings of the Optical Society of Korea Conference
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• 2008.02a
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• pp.279-280
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• 2008

극자외선 영역(${\lambda}$=13.5 nm)에서 기하학적 그림자 효과를 줄이기 위해 ITO 박막을 RF 스퍼터링을 사용하여 증착하였다. 이를 러더퍼드 후방산란 분석법과 X-선 반사율 분석법을 이용하여 극 자외선 영역에서 ITO 박막의 광학상수를 결정하였다.

• Broadcasting and Media Magazine
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• v.24 no.2
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• pp.19-31
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• 2019

자가간섭 디지털 홀로그래피는 기존의 홀로그래피 기술과 달리 비간섭 광원을 이용해 홀로그램을 취득할 수 있는 기술이다. 자가간섭계는 입사한 파면을 분리하고 변조시킨 뒤 다시 상호 간섭이 가능하게 합쳐주는 장치를 필요로 한다. 지금까지 발표된 관련 연구들은 모두 파면의 분리 방식, 즉 공간적 분리와 편광 상태에 따른 분리 방식으로 나눌 수 있다. 시스템의 원리와 대표적인 두 가지 시스템을 소개하고, 이어서 필자의 연구실에서 제안한 기하학적 위상을 이용한 자가간섭 디지털 홀로그래피 기술을 다룬다.

• Journal of the Korean earth science society
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• v.41 no.2
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• pp.194-207
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• 2020

The purpose of this study is to identify the types and characteristics of elementary school pre-service teachers revealed in the process of resolving the change of lunar phases, which emphasizes the context of actual observation, and to provide suggestions for areas to be considered in the elementary school teacher training program. To this end, we analyzed the 30 pre-service teachers' explaining the observable lunar phases, and the main research results are as follows. First, the phase change of the moon was often explained by introducing the timetable for each phase of the moon rather than based on observation of the phenomenon and scientific reasoning. Second, an alternative concept of the type that the moon is invisible when the sun rises or that the moon can always be observed has been identified. Third, there was a case of explaining that the time and orientation for observing the moon can be observed regardless of the position of the sun or when observing the sun. Also, the date of observing the moon was assumed to be approached by assuming the lunar calendar. Based on the above results, pedagogical implications were discussed.