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고강도 섬유의 습식부직포 제조에 관한 연구(IV) - 인장과 등방특성 -
이순근,주창환 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.11
In case of the high performance fibers having high strength and high temperature properties, the wet-laid nonwoven technique is the most suitable method for an isotropic web formation because the dry-laid technique involves many difficulties due to the brittleness of the fiber. Authors have manufactured the nonwovens of high performance fibers on the wet-laid system and investigated the effect of production conditions such as aspect ratio, binder fiber content, and fiber type on the tensile and isotropic characteristic of the nonwovens. The results showed that the breaking stress and initial modulus increased as the aspect ratio increased up to 1200 for carbon nonwovens and to 450 for glass nonwovens, respectively. However, in Oxipan nonwovens, the increase of the aspect ratio gave a slight decrease in the breaking stress with decrease in fiber dispersion in water. The effect of binder content was different depending on the fiber type. In carbon nonwovens, the increase of the binder content resulted in the increase in the breaking stress and initial modulus. In the glass nonwovens, the increase in the breaking stress was found only in the range of the binder content up to 50% and above this range the breaking stress started to decrease.
특허 문서로부터 키워드 추출을 위한 위한 텍스트 마이닝 기반 그래프 모델
이순근,임영문,엄완섭 대한안전경영과학회 2015 대한안전경영과학회지 Vol.17 No.4
The increasing interests on patents have led many individuals and companies to apply for many patents in various areas. Applied patents are stored in the forms of electronic documents. The search and categorization for these documents are issues of major fields in data mining. Especially, the keyword extraction by which we retrieve the representative keywords is important. Most of techniques for it is based on vector space model. But this model is simply based on frequency of terms in documents, gives them weights based on their frequency and selects the keywords according to the order of weights. However, this model has the limit that it cannot reflect the relations between keywords. This paper proposes the advanced way to extract the more representative keywords by overcoming this limit. In this way, the proposed model firstly prepares the candidate set using the vector model, then makes the graph which represents the relation in the pair of candidate keywords in the set and selects the keywords based on this relationship graph.
고강도섬유의 습식부직포 제조에 관한 연구(I) -섬유 수중분산의 이론과 현상적 고찰-
이순근,주창환 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.12
The wet-laid forming system is one of nonwoven manufacturing techniques to produce ideally isotropic webs from the specialty fibers having brittle and high strength properties such as glass, carbon and oxidized carbon fibers. To make the high performance wet-laid nonwovens, the fibers have to be easily dispersed in water with no defects (i. e., log, rope, dumbbell). In this study, we have theoretically suggested the mechanism of fiber dispersion behavior in water under the assumption of dispersion kinetics theory. And then we have experimentally evaluated the effects of processing factors, such as aspect ratio, fiber consistency, dispersing agent and mixing time, on the visibly perceived dispersion of the carbon and oxidized carbon fibers in water. As the results, the water dispersion of carbon fibers is poor with increasing aspect ratio and fiber content, while it does not show any difference when mixing time is increased. The nonionic surfactants on the dispersion of fibers in water are remarkably effective, however the anionic surfactants are not as evident as the nonionic ones. The oxidized carbon fibers are more uniformly dispersed than the carbon fibers in all processing conditions.
On the Historical Succession of Goguryeo in Northeast Asia
이순근 한국학중앙연구원 한국학중앙연구원 2005 Korea Journal Vol.45 No.1
본 연구는 고구려 역사의 귀속성을 알아보기 위하여 두가지 측면에서 접근하였다. 먼저 당대의 고구려와 중국이 서로 상대를 어떻게 인식하고 있었는가를 살펴보았다. 그 결과 고구려는 언제나 중국을 ‘이국’ 또는 ‘이민족’으로 여기며, 대부분의 경우 대등한 상대국으로 인식하였다. 중국 역시 고구려를 ‘오랑캐의 나라’로 인식하고 있음이 드러났다. 다음 고구려의 멸망 후 그 역사를 누가 이어왔는가를 살펴보았다. 고구려 멸망 후 그 역사를 수용하며 이어 온 것은 신라였다. 신라는 고구려인과 백제인을 포용하였고 그들의 역사의식을 존중하였다. 이러한 노력은 이후 한국사 전개에 다양성과 역동성을 갖게 하였다. 그 결과 통일신라→고려→조선→현대에 이르기까지 한국사에서 이러한 삼국의 역사는 한국고대사의 한 장으로 부동의 위치를 갖게 되었다. 반면 중국의 경우는 고구려가 멸망하자 고구려 단절의 정책을 취하였다. 그 결과 고구려역사는 이후 중국사에서 배제되었으며 오히려 고려를 고구려의 후예로 인정해 온 것이 사실이었다. 1980년대 중반에 들어 갑자기 중국이 고구려 역사를 그들의 역사로 주장하고 나온 것은 학문적인 측면에서 인정하기 어렵다.