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방검소재의 신뢰성평가를 위한 가속조건 검토 및 수명예측
장갑식,정예리,전병대 한국신뢰성학회 2014 한국신뢰성학회 학술대회논문집 Vol.2014 No.11
최근 호신용 제품의 수요가 증가하면서 총기를 사용하지 못하는 국내에서는 방검복에 대한 관심이 높아지고 있다. 방검복 소재는 일반적으로 아라미드와 고강도 폴리에틸렌, 유리섬유 등 특수섬유로 이루어져 있으며, 그 중에서도 초고분자폴리에틸렌(UHMWPE) 섬유는 고강도, 고탄성률이 우수하며 비중이 낮아 매우 경량이기 때문에 활동성을 요구하는 방검복 외에도 다양한 보호복에 접목되어지고 있다. 방검복에 사용되는 원사 및 원단은 생명을 지키는 중요한 소재로 정확한 수명예측이 필요하다. 본 연구에서는 UHMWPE 원사로 구성된 방검복 원단의 가속수명시험을 위한 가속조건을 도출하기 위하여 가수분해 및 광열화에 대한 열화특성을 평가하였다. 이로부터 광열화를 가속인자로 선정하였으며, 추정된 고장시간을 조사량에 대한 가속계수 및 사용주기를 고려하여 사용수명을 산출하였다. 가속수명시험결과 방검복 원단의 B10수명은 90% 신뢰수준에서 2.1년으로 추정되었다.
한국어의 Machine translation을 위한 구문 구조 분석
이주근,한성국,전병대,Lee, Ju-Geun,Han, Seong-Guk,Jeon, Byeong-Dae 대한전자공학회 1981 전자공학회지 Vol.18 No.5
이 논문은 기계 번역을 위한 한국어의 구문분석 algorithm과 system구성에 관한 것이다. 종래의 언어학적 문장구조를 재검토하여 품사와 성분을 통일된 관점에서 형태론적으로 분석 다음, 효과적인 품사분류 algorithm을 제안하고, 역이동변형 algorithm을 적용한 성분구조를 attribute개념을 도입하여 phrase structure rule로 처리하였다. 또한 한국어 조합문자의 조직개념을 lexicon구성에 도입하고 breadth-first searching에 의하여 문장의 심층구조가 포함된 parsing tate을 생성하는 구문분석 system을 구성하였으며, system program에 의해 입력문장을 심층구조로 분석한 결과를 보였다. This paper deals with the syntactic analysis algorithms of Korean sentence and system for machine translation. The parts of speech and constituients are syntactically analized at unified view-points and then an effective classification algorithm is proposed. The constituients which are applied an inverse movement transformation algorithm are processed with the concept of attribute. Syntactic analysis system is constructed to generate parsing table including the deep structure of sentence by lexicon proper to the combinational property of Korean and breadth-first searching method. The results obtained from the system program are shown as the parsing table of source sentences.
한태성,박준호,박상운,전병대,Han Tae Sung,Park Jun Ho,Park Sang Woon,Jeon Byong Dae 한국염색가공학회 2005 韓國染色加工學會誌 Vol.17 No.6
To manufacture hightech easycare wool, there are several methods which use strong oxidising agent or the resin treatment, however, neither are environmentally friendly methods. Moreover it may deteriorate the handle. The aim of this study is to manufacture the hightech easycare wool using the modified Fenton method which can be formed by hydrogen peroxide and ferric sulfate and enzyme treatment. The method was pretreated by ferric sulfate on the wool surface and then the surface of wool scale was selectively removed by ferric ion catalyst. Subsequently the Enchiron which is one of the proteolytic enzymes was treated on the wool surface. The treated wool had the result of having optimum weight loss and excellent whiteness and good handle. Therefore implications of these results suggest that this method using the modified Fenton method and enzyme treatment may be one way of manufacturing the hightech easycare wool.
장갑식(Gap-Shik Chang),정예리(Ye-Lee Jung),전병대(Byong-Dae Jeon) 한국신뢰성학회 2015 신뢰성응용연구 Vol.15 No.4
Purpose : UHMWPE (Ultra-high-molecular-weight-polyethylene) is one of the most widely used material in knife protection clothes because of high strength, elasticity, and light weight. The purpose of this study is to develop the accelerated life test method and predict the lifetime for the knife protection fabric composed by UHMWPE. Methods : In this study, degradation characteristics of UHMWPE fibers and knife protection fabric for cut resistance were evaluated under the hydrolysis and photo-degradation conditions. It was found out that the degradation rate of retained tensile strength was more significant in the photo-degradation than hydrolysis. Therefore, the failure time was determined as the time that the retained tensile strength in photo-degradation is less than 50%. Considering an acceleration factor for irradiance and exposure time, the lifetime was predicted from the calculated failure time. Results : As a result of the accelerated life test, the B10 lifetime of knife protection fabric composed by UHMWPE fibers is estimated as 2.8 years for a 90% statistical confidence level. Conclusion: Since the lifetime is predicted by the view-point of radiant exposure in this study, there is a possibility that the estimated lifetime may differ from the actual lifetime. However, it is considered as an useful methodology to estimate the long-term lifetime of knife protection fabrics.