• Aerospace Engineering and Technology
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• v.6 no.2
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• pp.111-118
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• 2007

KSLV-I which is being developed in KARI is composed with two stages, and adaptor ring is used for coupling stage. Cables for interconnecting between stage is exposed on the outside. Also 8 pyro bolts which are installed in adaptor ring are used for separation of stage. In general, cowl is used for protecting exposed parts or structure which are anxious about damage from outer environment. In KSLV-I, two kind of cowls are designed. The one is umbilical cowl, and the other is pyro bolt cowl. Because cowl is exposed on the outside, heat and pressure load developed from air have effect on cowls. Therefore verification of structural strength through static analysis is required. In this study, static analysis in load condition except heat load is accomplished. In result of analysis, structural strength of pyro bolt cowl is verified. But breakage of umbilical cowl is confirmed in pressure load condition. So design of umbilical cowl is modified for satisfying required structural strength. And structural strength of umbilical cowl through analysis is verified.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04b
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• pp.106-108
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• 2002

본 연구에서는 멀티미디어 데이터 검색에 클러스터링과 인덱싱 기법을 같이 적용하여 유사할 이미지끼리는 인접 디스크에 클러스터하고 이 클러스터에 접근하는 인덱스를 구축하여 검색이 빠르게 이루어지는 유사 검색방법을 제시한다. 이 연구에서는 트리 유사 구조의 인덱스 대신 해싱 방법을 이용하며 검색시 I/O시간을 줄이기 위해 오브젝트를 가진 클러스터 위치를 찾는데 한번의 I/O를 사용하고 이 클러스터를 읽기 위해 연속주인 파일 I/O를 사용하여 클러스터를 찾는 데용을 최소화한다 클러스터인덱싱 접근은 트리 유사 구조와 임의 I/O를 사용한 내용기반의 이미지 검색보다 효율적인 검색 적합성을 보이며 연속적 I/O를 통해 검색 미용을 낮춘다.

• Journal of the Korea Computer Industry Society
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• v.2 no.6
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• pp.747-758
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• 2001

While developing the military intelligence systems, inter-operation problems which are even existed in the advanced countries must be secured. So we intend to contribute the development of concerned theories by suggesting the process and results of the operational architecture(OA) in C4ISR architecture framework that U.S. military researched and setup based on C4ISR architecture framework theory and BPR methodology.

• Journal of Life Science
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• v.9 no.2
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• pp.207-211
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• 1999

Biologically active compounds in Polygonatum sibiricum were extracted using organic solvents as hexane, CHCl$_3$, n-butanol corresponding each component. Compound I was purified from hexane layer and the chemical structure of compound I was characterized using 1H-NMR, 13C-NMR, DEPT135, COSY, HMQC, HMBC spectrum and MS-spectrum. Consequently, the chemical structure of compound I was determined as 9,12-(9E,l2E)-octade cadienoic acid.

• The magazine of the Korean Society for Advanced Composite Structures
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• v.1 no.3
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• pp.11-16
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• 2010

• The magazine of the Korean Society for Advanced Composite Structures
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• v.1 no.2
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• pp.13-18
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• 2010

• The magazine of the Korean Society for Advanced Composite Structures
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• v.1 no.2
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• pp.19-22
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• 2010

• Journal of Korean Association for Spatial Structures
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• v.7 no.4
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• pp.14-20
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• 2007

• Proceedings of the Korea Concrete Institute Conference
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• 2010.05a
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• pp.473-474
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• 2010

This high pressure synchrotron X-ray diffraction study examined the change of bulk modulus of C-S-H(I), core material creating strength in alkali-activated slag cement as well as structural model of C-S-H, mainly attributed to Al-substitution for Si, which occurs at the bridging tetrahedral sites in dreierketten silicate chains in the nanostructure of C-S-H(I). This study presents that Al-substitution in C-S-H(I) does not affect the bulk modulus of C-S-H(I), which is surprising because many researchers have expected that Al-substitution should induce some critical change in mechanical properties of C-S-H(I).

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.12
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• pp.189-194
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• 2014

In this study, from a new x-ray detector that combines a columnar CsI:Na scintillation layer with a photosensitive mercuric iodide layer was investigated. In this structure, X-rays are converted into visible light on a thick CsI:Na layer, which is then converted to electric charges in a thin $HgI_2$ bottom layer. The thin coplanar mercuric iodide films as a photosensitive converter requiring only a few tens of volts of bias, associated with a thick columnar coating of phosphor layer, were simulated and designed. The results of this research suggest that the new coplanar x-ray detector with a hybrid-type structure can resolve the following problems: high voltage from the a-Se, and low conversion efficiency from the indirect conversion method. The results of this research suggest that the new CsI:Na/$HgI_2$ x-ray detector with a double-layer type structure can resolve the following problems: high voltage from the direct conversion method, and low conversion efficiency from the indirect conversion method.