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오진수,우창기,이장규,Oh, Jin-Soo,Woo, Chang-Ki,Rhee, Zhang-Kyu 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
In this study, DAQ and TRA modules were applied to the CFRP single specimen testing method using AE. A method for crack identification in CFRP specimens based on k-mean clustering and wavelet transform analysis are presented. Mode I on DCB under vertical loading and mode II on 3-points ENF testing under share loading have been carried out, thereafter k-mean method for clustering AE data and wavelet transition method per amplitude have been applied to investigate characteristics of interfacial fracture in CFRP composite. It was found that the fracture mechanism of Carbon/Epoxy Composite to estimate of different type of fractures such as matrix(epoxy resin) cracking, delamination and fiber breakage same as AE amplitude distribution using a AE frequency analysis. In conclusion, the presented results provide a foundation for using wavelet analysis as efficient crack detection tool. The advantage of using wavelet analysis is that local features in a displacement response signal can be identified with a desired resolution, provided that the response signal to be analyzed picks up the perturbations caused by the presence of the crack.
오진수 ( Jin-soo Oh ),유준석 ( Joon-suk Ryu ),김응모 ( Ung-mo Kim ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.2
오늘날 사람들의 의견을 제시하는 공간은 폐쇄적인 인쇄물이나 수동적인 답변 수준을 벗어나 무한의 공간을 가지는 웹에서 이루어지고 있다. 불특정 다수를 대상으로 하며 정형화된 틀을 없는, 더욱 유용한 의견을 많이 얻을 수 있는 특징을 가졌기 때문에, 이를 위해 오피니언 마이닝에 대한 연구가 활발히 진행되고 있다. 기본적으로 오피니언 마이닝은 해당 분야에 대한 정확한 정보를 찾는 것을 목적으로 하지만, 그러한 정보를 제외한 나머지 부분에 대해서도 충분히 유용하게 사용할 수 있다. 본 논문에서는 그 나머지 부분을 이용하여 무분별하게 등록되고 있는 스팸성 댓글을 효과적으로 필터링 할 수 있는 방법을 제안한다.
소형 Gun Drill Machine 개발에 관한 연구
오진수(Jin-Soo Oh),강동명(Dong-Myeong Kang),박광훈(Kwang-Hoon Park),남궁재관(Chai-Kwan Namkoong),우창기(Chang-Ki Woo) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.4
A compact gun drill machine was developed to improve productivity and economical efficiency for small and medium enterprise tool makers. Gun drilling works are mainly using at molding, automobile, aircraft industry and special tool makers to make deep holes. As gun drill machines are very expensive and big burden for small tool makers, so that works used to execute through outside orders but it was required lot of cost too. Most of gun drill machines are providing for high volume and large capacity enterprises. In order to use for small and medium enterprises that compact gun drill machine was designed and developed. It could be improved product quality, productivity and manufacturing cost for small and medium enterprises by using this machine.
소형 Gun Drill Machine 개발에 관한 연구
오진수(Jin-Soo Oh),박광훈(Kwang-Hoon Park),남궁재관(Chai-Kwan Namkoong),우창기(Chang-Ki Woo),강동명(Dong-Myeong Kang) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This compact Gun Drilling Machine was developed to improve productivity and economical efficiency for small and midium enterprise tool makers. To produce specialize tools that gun drilling works should be required prior to making deep holes. Gun drill machines are so expensive and big burden for small tool makers so that works used to execute through outside orders but it was required lot of cost too. Most of gun drill machines are providing for high volume and large capacity enterprises. In order to support for small and medium enterprise purpose that compact gun drill machine was designed and developed. It could be improved products quality, productivity and saving manufacturing cost using this machine.
골수유래 간엽줄기세포의 조건배지가 Ntera-2 인간신경세포의 신경돌기 성장에 미치는 영향
오진수 ( Jin Soo Oh ),( Meng Lu Liu ),( Hong Lian Jin ),안성수 ( Sung Su An ),김긍년 ( Keung Nyun Kim ),윤도흠 ( Do Heum Yoon ),하윤 ( Yoon Ha ) 한국조직공학·재생의학회 2009 조직공학과 재생의학 Vol.6 No.4
Bone marrow derived mesenchymal stem cell(BMSC) based cell therapy can promote functional recovery and regeneration in central nervous system(CNS) disease models. These beneficial effects have been primarily attributed to the differentiation potential into varieties of cell lineages and the therapeutic paracrine factors secreted by BMSC after transplantation. Many secreted factors from BMSC have been identified recently in the conditioned media. However, the effects of these factors on the neuronal regeneration need further verification with relevant neuronal models. Ntera-2 neurons have been used for the therapy of several different CNS diseases in animal models. Recently some clinical trials have confirmed the safety and potential efficacy of Ntera-2 neurons for stroke therapy. In this study, the Ntera-2 neuron model was used to directly verify the effect of BMSC conditioned media(BMSCCM) on neurite outgrowth in vitro. Our study confirmed that the BMSC-CM could increase both the neurite length and branch number of Ntera-2 neurons, compared to the control group with non-conditioning media. Since the BMSC can secret many therapeutic factors into the conditioned media, our data support the theory that BMSC promote neurite outgrowth through secreting paracrine factors.
오진수(Jin-Soo Oh),우창기(Chang-Ki Woo),이장규(Zhang-Kyu Rhee) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.3
In this study, DAQ and TRA modules were applied to the CFRP single specimen testing method using AE. A method for crack identification in CFRP specimens based on k-mean clustering and wavelet transform analysis are presented. Mode I on DCB under vertical loading and mode II on 3-points ENF testing under share loading have been carried out, thereafter k-mean method for clustering AE data and wavelet transition method per amplitude have been applied to investigate characteristics of interfacial fracture in CFRP composite. It was found that the fracture mechanism of Carbon/Epoxy Composite to estimate of different type of fractures such as matrix(epoxy resin) cracking, delamination and fiber breakage same as AE amplitude distribution using a AE frequency analysis. In conclusion, the presented results provide a foundation for using wavelet analysis as efficient crack detection tool. The advantage of using wavelet analysis is that local features in a displacement response signal can be identified with a desired resolution, provided that the response signal to be analyzed picks up the perturbations caused by the presence of the crack.