• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1999.10a
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• pp.19-19
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• 1999

KSR 3단 AKM Motor Case를 개발하기 위해 추진기관 경량화에 가장 유리하고 비강도 및 비강성이 뛰어난 복합재 연소관을 고려하여 직경 300mm급의 축소형 모델을 선행 개발하였다. Netting 이론에 의해 연소관 두께를 결정하고 체적을 최소화 하기 위해 구형으로 연소관 형상을 설계하였다. 연소관을 제작하기 위한 맨드렐은 분리, 조립식으로 설계, 적용하였고 연소관 기밀 유지 및 추진기관 연소시 연소관을 보호하기 위한 삭마성 재료로 EPDM base의 고무 내열재 조성을 개발하였다. 고무 내열재는 맨드렐 위에 적층하고 Vacuum bagging 상태로 Autoclave에서 가황하여 적용하였다. 국내 최초로 Prepreg를 사용하는 Dry process로 고무 내열재가 적층된 맨드렐 위에 Winding하고, Vacuum bagging 상태에서 경화하여 연소관을 제작하였으며, 이 때 사용한 Carbor/Epoxy Perpreg 재료의 기계적 성질 및 열특성 시험을 병행하였다. 제작된 연소관은 수압 시험을 통하여 구조적 안정성을 입증하였고, NDT 검사를 통해 재료간 계면 상태를 분석하였다. 시험이 끝난 연소관은 향후 점화기 개발을 위하여 점화제 종류 및 약량을 변경하여 점화 시험을 수행하여 점화기 개발을 위한 기초 데이터를 확보하였다.

• Journal of The Korean Digital Architecture Interior Association
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• v.10 no.3
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• pp.29-38
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• 2010

르네상스 시대의 필리포 브뤼넬레치, 19세기의 쟝 니꼴라 루이 뒤랑, 근대 건축의 꾸르뷔지에, 귀세프 테라니, 밀르벤 데르호흐, 그리고 현대건축의 장 누벨과 같은 5명의 건축가의 예를 통해, 건축에서 늘 되풀이되어 나타나는 기하학적 형체로서의 이 격자무늬는 자신의 다면성을 보여준다. 합리적인 면은 그대로 간직한 채, 격자무늬는 순서대로, 균형잡힌 비율의 선, 축에 관한 구성체계, 조립식 건축의 구조, 합리주의의 상징, 건물의 배치와 크기를 결정하는 반복적인 조직망, 삼차원 공간에서의 프랙탈한 이미지로서 나타난다.

• Journal of the Korean Society of Safety
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• v.10 no.4
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• pp.81-86
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• 1995

In order to apply to analysis methods of mechanism and cross tabulation methods for the influence factors by the accident types to the object of accidents which occurred in R.C and P.C methods among the accidents in construction work sites, the latent hazards in P.C method are evaluated from the data of accidents in H Company from Jan. 1, 1993 to Dec. 31, 1993. The relationship between accident types and unsafe acts, unsafe conditions are recognized and the hazards of R.C method and P.C method are compared from the data acquired by the analysis of causes for a kind of occurrence mechanism. In conclusions, the items such as causes of accidents, accidents types, occurrence time, and the characteristics, are concentrated on one side in the P.C method, which is quite different from R.C method. Therefore the control method for the accident causes is easily established with a lot of effective advantages. The frequency and severity of accidents in P.C method are so low in comparison with R.C method.

• Journal of the Korean Society of Safety
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• v.26 no.2
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• pp.48-61
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• 2011

In this study, static tests were done on the joints between precast manholes and the joints between manhole and sewer. The static loading tests in not only elastic range but also ultimate state of model members were carried out to investigate the bond strength and ultimate load of a joint of precast manholes. Specimens were tested in bending, horizontal shear, horizontal shear of circumferencial direction and direct tension. The results of tests indicated good structural performance of the joints between precast manholes and the joints between manhole and sewer.

• KIEAE Journal
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• v.6 no.4
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• pp.17-24
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• 2006

The application of photovoltaics into building as integrated building components has been paid more attention worldwide. Photovoltaics or solar electric modules are solid state devices, directly converting solar radiation into electricity; the process does not require fuel and any moving parts, and produce no pollutants. And the prefab building method is very effective because the pre- manufactured building components is simply assembled to making up buildings in the construction fields especially the sandwich panel. Architecture considerations for the integration of PV module to building envelope such as building structure, construction type, safety, regulation, maintenance etc. have been carefully refelected from the early stage of BIPV module design. Trial product of BIPV module are manufactured and sample construction details for demonstration building are purposed. Therefore, this paper intends to advanced its practical use by proposing how to get integrated PV system which can be applied to prefab building material, and how to apply it.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.05a
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• pp.183-184
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• 2018

Recent construction projects have now regenerated the existing city rather than reconstruction or redevelopment to create a new paradigm. While the aged houses are reviewed to distinguish between the repair, reinforcement and reconstruction stages, the modular construction system makes the most of space using the modular system, and the projection mapping system is combined with the existing space. Therefore, we will proceed with the research so that improvement and correction of future issues can be made.

• Proceedings of the KIEE Conference
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• 1999.07e
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• pp.2086-2088
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• 1999

765kv Transmission lines of the contaminated areas need many insulators due to the contamination. So the length of the arcing hem is very long. Because it is very difficult to install the arcing hem on insulator string sets due to its length, we must install the arcing horn on the jumping devices, and studied about the jumper horn. This paper described the investigation and analysis of the installation status of the arcing horn, and the design of the jumper horn for 765 kV transmission lines.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2007.04a
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• pp.533-538
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• 2007

Since glass-fiber reinforced composite decks have high-strength, light-weight and high durability, many researches on the composite decks for bridges are currently performed and many composite decks are developed. Some of the developed composite decks can be applied as rigmats for temporary roads such as oil developing temporary roads. In this paper, a composite deck for rigmat is developed and studied. Structural behavior of the developed composite deck for rigmat is verified by both analysis and experiment.

• Journal of the Society of Disaster Information
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• v.7 no.3
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• pp.198-205
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• 2011

In this paper, an experimental study is performed in order to determine the effects of interaction between vehicle and structure. For this purpose a wheel tracking machine and an adequate precast concrete deck single span bridge are designed. Results presented in the paper show that interaction between vehicle and structure produce additional effects on dynamic behavior of structure including reversal and contrary behavior.

• Magazine of the Korean Society of Agricultural Engineers
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• v.41 no.4
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• pp.66-76
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• 1999

In this study , the optimum structural components for the rural house design using the light gauge cold-formed steel frame is proposed. The proposed components were optimzed by the developed model composed with the analysis model and LGC database. The analysis model adapts FEA(finite element analysis). LGC database and calculation of element force adapt the design criteria of KISC. The structure of house is divided into header, bearing wall and foof truss. The variable of the each structure of house are defined component which designed by the case of load, aize and space. The designed weight were used for optimization procedure of the divided components.