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정우균(Woo-Kyun Jung),안성훈(Sung-Hoon Ahn),원명식(Myung-Sik Won) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.8
전자기파 차폐의 필요성에 대한 인식의 증대와 함께 다양한 연구가 활발히 진행되고 있다. 전자기파의 흡수 및 반사특성을 통한 연구가 수행되어 왔으며, 근래에는 특별한 전자기적 특성을 지닌 나노 재료를 이용한 연구가 진행되고 있다. 카본블랙과 탄소사노튜브는 우수한 전자기파 흡수 물질로 알려져 있다. 또한 은(Ag)은 우수한 전도도와 반사특성을 지닌 물질로서 나노스케일에서도 이러한 특성이 유지되는가에 대해서는 명확히 밝혀지지 않았다. 이러한 나노 재료들을 이용하여 유리섬유강화 나노 복합재료(Glass Fiber Reinforced Nano composites : GFR-Nano composites)를 제작, TEM 및 SEM 사진을 통해 구조적 특성을 확인하고 HP8719ES 회로망 분석기를 이용하여 전자기파 차폐효과를 측정하였다. 카본블랙과 탄소나노튜브는 예상한대로 우수한 전자기파 흡수특성을 보였으며, 은 나노 재료는 약간의 반사적 특성을 보이기는 하였으나 괄목할만한 결과를 보이지는 않았다.
나노입자 첨가 유리섬유강화 복합재료의 전자기파 차폐특성
정우균(W. K. Jung),안성훈(S. H. Ahn),원명식(M. S. Won) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The research on electromagnetic shielding has been advanced for military applications as well as for commercial products. Utilizing the reflective properties and absorptive properties of shielding material, the replied signal measured at the rear surface or at the signal source can be minimized. The shielding effect was obtained from materials having special absorptive properties or from structural characteristics such as stacking sequence. Recently researchers studied the electromagnetic properties of nano size particles. In this research {glass fiber}/{epoxy}/{nano particle} composites(GFR-Nano composites), was fabricated using various nano particles, and their properties in electromagnetic shielding were compared. For the visual observation of the nano composite materials, SEM(Scanning Electron Microscope) and TEM(Transmission Electron Microscope) were used. For the measurement of electromagnetic shielding, HP8719ES S-parameter Vector Network Analyser System was used on the frequency range of 8㎓ ~12㎓. Among the nano particles, carbon black and Multi-Walled Carbon Nano-Tube (MWCNT) revealed outstanding electromagnetic shielding. Although silver nano particles (flake and powder) were expected to have effective electromagnetic shielding due to their excellent electric conductivities, test showed little shielding effect.
고층 건축물 마감공사를 위한 건설용 리프트 계획 및 관리 통합형 양중모델
이명도(Lee, Myung-Do),원명균(Won, Myeong-Kyun),이웅균(Lee, Ung-Kyun),조훈희(Cho, Hun-Hee),강경인(Kang, Kyung-In) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.5
The objective of this study is to propose an integrated lifting model of planning and operation for finishing works in tall building construction. The model consists of five components: lifting schedule chart, lifting load leveling, lifting equipment planning, lifting TACT and lifting table. The model was designed to provide a more practical lifting planning and operating method for construction managers as well as to cope with unexpected schedule delays. To validate the proposed model, a case study was performed in building a construction project; questionnaires were distributed in order to evaluate its effectiveness compared with the original method. A case study showed the following results. (1) The model is estimated to provide more practical lifting planning alternatives compared with the original method to construction managers. (2) The model can be a valuable management tool in terms of the lifting operation of construction lift. (3) The model can be provide an effective method to cope with unexpected situations through the integration of lifting planning and operation. Therefore, It is expected that the proposed model can be employed as practical means to the planning and operation of construction lift at construction sites.