172. 부신질환에 대한 부신수술 경험 18예

우병철,이봉화,박흥길,이찬영 대한외과학회 1989 대한외과학회 학술대회 초록집 Vol.1989 No.11

궐수형철기를 통해 본 진·변한 정치체의 상호작용 – 대등 정치체 상호작용 모델(peer polity interaction model)의 적용 -

우병철,김민철 한국상고사학회 2009 한국상고사학보 Vol.65 No.-

This study intends to answer a specific question; how can we explain the relationship of small polities of Jin·Byeon Han(辰·弁韓) in proto three– kingdom period properly. Based on the framework of this study, peer polity interaction(PPI) model which have been thought as brand new concept model in explaining social– political relation between regional polities in a certain geographical area, archeological materials in question have been treated properly. Due to the fact that bracken– shaped motif is adopted exclusively in most of ironware unearthed from Jin·Byeon Han region, this study has focused on Bracken– shaped ironware as the examining subject. More specifically, the exclusive distribution of bracken– shaped could imply that small polities of Jin·Byeon Han shared common customs of tradition. Moreover, that distribution also might be considered as the results of interactions such as warfare, trade, competition between polities. It seems like that the motif of bracken– shaped had been the traditional symbol which shows the superiority of elites of small polities. The distribution of bracken– shaped motif implies that internal complexity of organization in small polities had increased, and in proto three– kingdom period, the small polities had interacted each other based on the peer relation. Competitive emulation and Symbolic entrainment were being happened between polities might be seen in particular aspects of burial for ironware with bracken– shaped. These aspects of wooden– chamber tomb phase suggest the peer political interaction between regional polities in Jin·Byeon Han. Thus, the established explanations that have mentioned the superior culture had flew from the set innovative centre to the vicinities need more discussion. 이 글에서는 원삼국시대 진·변한지역 諸정치체들의 관계를 어떻게 바라보고 설명할 것인가 하는 다소 구체적인 질문에 답하고자 하였으며, 당대 사회를 적절하게 설명해줄만한 해석의 틀을 시험적으로 적용하여 고고자료를 분석하였다. 영남지방 출토 궐수형철기는 2~3세기에 집중적으로 유행한다. 또한 주요 목곽묘군 내에 서도 수장급묘에 집중 부장되고 일괄유물의 검토에 있어서도 그 우수성이 인정되는 점으로 보아, 본고에서는 궐수형철기를 각 지역 정치체 엘리트 간에 있었던 대외과시 및 경쟁의 산물로 추정하였다. 궐수형철기는 그 형태의 변화에 따라 Ⅰ기~Ⅲ기로 나눌 수 있으며, Ⅰ기~Ⅱ기에는 각 지역 출토품들 상호간에 공통성이 강하고 Ⅲ기에는 경주지역과 김해지역을 중심으로 지역성이 두드러지기 시작한다. 이러한 패턴을 통해 각 시기별로 궐수형철기가 제작·매납된 의미를 각 지역정치체의 대외적 관점에서 추론하였다. Ⅰ기~Ⅱ기는 諸소국들이 비교적 대등한 위상을 유지, 상호작용하면서 내적 복합성이 증가된 시기이며 Ⅲ기부터 궐수형철기를 비롯해 고고자료 전반에서 변화를 겪게 되는데 이는 당시 각 지역 수장들이 겪었던 對내·외적 위상의 변화와 관련된 것으로 파악하였다.

USN을 이용한 홈네트워크

우병철,U, Byeong-Cheol 한국정보통신기술협회 2006 TTA저널 Vol.105 No.-

열전발전

우병철,U, Byeong-Cheol 한국전기산업진흥회 1998 電氣産業 Vol.9 No.1

Pb(Fe1/2Ta1/2)O3-Pb(Fe1/2Nb1/2)O3 고용체의 유전특성 및 질서배열구조

우병철,김병국,이종호,박현민,김병호 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.9

The single phase Pb{Fe1/2(Ta1-xNbx)1/2}O3 (x = 0.0∼1.0) solid solutions were successfully synthesized and their ordering structures as well as dielectric properties were investigated. {r(Nb5+) = r(Ta5+) = 0.78Å, AW(Nb5+) = 92.91, AW(Ta5+) = 180.95} While Pb(Fe1/2Ta1/2)O3 showed typical relaxor ferroelectric characteristics such as dielectric relaxation and diffuse phase transition, the sharpeness of the phase transition increased as Ta5+ was replaced by Nb5+, and finally Pb(Fe1/2Nb1/2)O3 showed normal ferroelectric characteristics with no dielectric relaxation. By using Raman spectroscopy, it was revealed that the Fe3+ and Ta5+ ions of Pb(Fe1/2Ta1/2)O3 were stoichiometrically 1:1 ordered within the short range which can be hardly probed even by TEM. Also, The degree of ordering in Pb(Fe1/2Ta1/2)O3 decreased as Ta5+ was replaced by Nb5+, and finally Fe3+ and Nb5+ ions of Pb(Fe1/2Nb1/2)O3 were completely disordered. The relaxor ferroelectric characteristics of Pb(Fe1/2Ta1/2)O3 could be correlated with the stoichiometric 1:1 ordering of B-site cations within the short range which can be hardly probed even by TEM. Also, the decrease of the relaxor ferroelectric characteristics with the replacement of Ta5+ by Nb5+ could be correlated with the weakening of the ordering, and the normal ferroelectric characteristics of Pb(Fe1/2Nb1/2)O3 could be correlated with the complete disordering of B-site cations. Pb(Fe1/2Ta1/2)O3의 Ta5+을 Ta5+과 이온반경이 같고 원자량이 약 1/2배인 Nb5+으로 치환한 Pb{Fe1/2(Ta1-xNbx)1/2}O3 (x = 0.0∼1.0) 고용체를 단일상으로 합성하여 그 유전특성 및 B자리 양이온 질서배열구조를 조사하였다. Pb(Fe1/2Ta1/2)O3는 유전완화현상 및 완만한 상전이가 뚜렷하게 관찰되는 전형적인 완화형 강유전특성을 보였지만, Ta5+이 Nb5+로 치환됨에 따라 유전완화현상은 감소하고 상전이는 급격해져 결국 Pb(Fe1/2Nb1/2)O3는 유전완화현상이 전혀 관찰되지 않는 정상 강유전특성을 보였다. Raman분광법에 의해 Pb(Fe1/2Ta1/2)O3의 Fe3+와 Ta5+이온은 XRD는 물론 TEM의 제한시야회절패턴으로도 검출하기 어려울 정도의 단거리영역에서 화학양론적으로 1:1 질서배열하고 있으며, Ta5+이 Nb5+로 치환됨에 따라 Fe3+와 (Ta5+-Nb5+)이온들 간의 질서배열은 약화되어 결국 Pb(Fe1/2Nb1/2)O3의 Fe3+와 Nb5+이온은 완전 무질서배열하고 있음이 밝혀졌다. Pb(Fe1/2Ta1/2)O3의 완화형 강유전특성은 B자리 양이온들이 XRD는 물론 TEM의 제한시야회절패턴으로도 검출하기 어려울 정도의 단거리영역에서 화학양론적 1:1 질서배열을 하고 있는 것과, 또 Pb(Fe1/2Ta1/2)O3의 Ta5+이 Nb5+로 치환됨에 따라 완화형 강유전특성이 감소되는 것은 이 질서배열이 약화되는 것과, 그리고 Pb(Fe1/2Nb1/2)O3의 정상 강유전특성은 B자리 양이온들이 완전 무질서배열을 하고 있는 것과 연관지을 수 있었다.

ANSYS를 이용한 현수애자의 계면팽창거동에 따른 특성평가

우병철,한세원,조한구 대한전기학회 2003 전기학회논문지C Vol.52 No.8

- The suspension insulators are subjected to harsh environment in service for a long time. Long term reliability of the insulators is required for both mechanical and electrical performances. We studied an analysing method to find out a deformation of brittle porcelain with a thermal expansion of simulation analysis and experimental results show that cement volume growths affect severely to b mechanical failure ageing..

온수를 이용한 열전발전기에서 유량변화에 따른 발전 특성

우병철,이희웅,서창민,Woo, Byung-Chul,Lee, Hee-Woong,Suh, Chang-Min 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.10

The objective of this study is to develop a thermoelectric generation system which converts unused energy from close-at-hand sources such as garbage incineration heat and industrial exhaust etc. into electricity. This paper presents applicability of a commercially available thermoelectric generator f3r waster heat recovery. The test facility consists of water heater, pump, thermoelectric module and aluminium tubes and hot and cold water is used as heat source and sink fluids. It is shown that the three components of thermoelectric research exist in manufacturing a thermoelectric generator. The first component is fabrication of thermoelectric materials, the second is manufacturing of thermoelectric generator with 32 thermoelectric modules. The last one is characteristic measuring of thermoelectric generator with 32 thermoelectric modules of two types, cooling and power purpose. It was found that the rate of cold and hot water is 25 and 37 liter per minute and the maximum power of thermoelectric generator is 28Watts and its efficiency is 1.04%.

열전발전용 Bi-Te Module에서 미끄럼에 따른 열응력 완화 특성

우병철,이희웅 대한전기학회 2003 전기학회논문지C Vol.53 No.6

Recently the research for utilization of waste heat produced from electric power plants, casting factories, heat treating factories or commercial building are being afforded by the need for energy saving. The objective of this study is to develop a thermoelectric generation system which converts unused energy from close-at-hand sources such as garbage incineration heat and industrial exhaust etc. into electricity. This paper presents a thermoelectric technology on a optimum system design method and efficiency and cost effective thermoelectric element on order to extract the maximum power output from energy conversion of waste energy. It is shown that the longitudinal stresses of module contacted with two point constrained AI tubes could be released more than those with a one-point constrained.

“後期加耶의 武器와 軍事組織”에 대한 토론

우병철 영남고고학회 2010 영남고고학회 학술발표회 Vol.19 No.1

열전모듈을 이용한 열에너지 변한 기술과 응용 ( Energy Conversion & Application of thermoelectric Module )

우병철,이희웅,이동윤 한국에너지학회 1998 한국에너지공학회 학술발표회 Vol.1998 No.-