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김경민(KyongMin Kim),안무혁(MuHyok Ahn),이윤호(Younho Lee) 한국정보과학회 2014 정보과학회 컴퓨팅의 실제 논문지 Vol.20 No.4
본 논문에서는 네이버 영화 평점 데이터를 바탕으로 왜곡된 평점을 주는 사용자를 필터링하는 방법을 제안한다. 제안 방법은 사용자의 평점을 주는 패턴 및 사용자들의 개인 평에 사용하는 단어들의 특성을 파악하여 해당 사용자가 왜곡된 평점을 주는지의 여부를 판별한다. 제안 방법을 1000명 이상의 개인 사용자가 평을 한 네이버 영화들에 적용한 결과 약 7~20%의 사용자가 왜곡된 평점을 주는 것을 확인 할 수 있었으며, 필터링 후 평점의 순위가 바뀌는 것을 확인할 수 있었다. 본 연구의 결과는 올바른 영화 평점을 얻고자 하는 사용자들에게 좋은 공헌을 할 것으로 기대된다. This paper proposes a way to filter out the people who give distorted movie ratings in On-line environment. With the movie rating data from Naver (www.naver.com), we have found two typical patterns that the malicious movie raters have presented. The first is that their points are very extreme. The second is that their opinions with regard to the movie are normally very irrelevant to the content of the movie. Leveraging this fact, the proposed scheme could filter out around 7~20% of the raters, which leads to non-trivial change of the ranking of the movies. This paper contributes to the people who want to know the true ratings of movies.
나노 오일을 이용한 압축기 습동부 재질의 윤활 특성 향상에 관한 연구
김성춘(Sungchoon Kim),김경민(Kyongmin Kim),황유진(Yujin Hwang),박영도(Youngdo Park),이재근(Jaekeun Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.10
Performance of refrigerant oil at the thrust-bearing and at the journal-bearing of a scroll compressor is a significant factor. This paper presents the friction and anti-wear characteristics of nano oil with a mixture of a refrigerant oil and carbon nano particles. The characteristics of friction and anti-wear using nano-oil is evaluated using the disk on disk tester for measuring friction surface temperature and the coefficient of friction. The average friction coefficient of nano-oil was reduced by 60% compared to raw oil under 600 N and 1,000 rpm. It is believed that the interaction of nano particles between surfaces can be improved the lubrication in the friction surfaces. Worn surfaces of frictional specimen were also investigated by the optical and atomic force microscopy. Conclusively, it is expected that wear and friction coefficient of compressor can be reduced by alignment applying nano-oil as refrigerant oil.
Ribosome Display를 이용한 항체선별 방법의 확립
이명신,권명희,김경민,박선,신호준,김형일,Lee, Myung-Shin,Kwon, Myung-Hee,Hwang Kim, Kyongmin,Park, Sun,Shin, Ho-Joon,Kim, Hyung-Il 대한면역학회 2003 Immune Network Vol.3 No.3
Background: Phage display is the most widely used technique among display methods to produce monoclonal antibody fragment with a specific binding activity. Having a large library for efficient antibody display/selection is quite laborious process to have more than $10^9$ members of transformants. To overcome these limitations, several in vitro selection approaches have been reported. Ribosome display that links phenotypes, proteins, directly to genotype, mRNA, is one of the in vitro display methods. Ribosome display can reach the size of scFv library up to $10^{14}$ molecules and it can be further diversified during PCR steps. To select the high affinity scFv from one pot library, we established ribosome display technique by modifying the previously reported eukaryotic translation system. Methods: To establish the antibody selection system by ribosome display, we used 3D8, anti-DNA antibody. A 3D8 scFv was synthesized in vitro by an in vitro transcription-translation system. The translated 3D8 scFv and the encoding 3D8 mRNA are connected to the ribosome. These scFv-ribosome-mRNA complexes were selected by binding to their specific antigens. The eluted mRNAs from the complexes are reverse transcribed and re-amplified by PCR. To apply this system, antibody library from immunized mouse with terminal protein (TP)-peptide of hepatitis B virus DNA polymerase TP domain was also used. This TP-peptide encompasses the 57~80 amino acid residues of TP. These mRNA/ribosome/scFv complexes by our system were panned three times against TP-peptide. The enrichment of antibody from library was determined by radioimmunoassay. Results: We specifically selected 3D8, anti-DNA antibody, against ssDNA as a model system. The selected 3D8 RNAs sequences from translation complexes were recovered by RT-PCR. By applying this model system, we enriched TP-peptide-specific scFv pools through three cycles of panning from immunized library. Conclusion: We show that our translating ribosome complexes are well maintained and we can enrich the TP-specific scFv pools. This system can be applied to select specific antibody from an antibody library.
ESG와 기업가정신을 접목한 교육프로그램 적용에 관한 탐색적 연구: 초·중·고 교육 프로그램 운영 사례를 중심(中心)으로
남승완,이종현,이창수,김경민,이선영,김승철,Nam, Seungwan,Lee, chonghyun,Lee, Changsoo,Kim, Kyongmin,Lee, Sunyoung,Kim, Seungchul 한국벤처창업학회 2022 벤처창업연구 Vol.17 No.5
Human Human species run into a blind alley due to abnormal weather and climates everywhere in global village. Human beings are helpless against the nature and might begin to learn humbleness just now. However, humans cannot attribute current abnormal weather and climates to only natural phenomenon because we have never been affectionate to global environments sufficiently up to now that results in running into this blind alley. At this point, the only thing that humans can do is to love and care for the earth more. ESG is an emerging topic to cope with this issue and practice of ESG will be the pending mission for the next generation. In this research, 'active participatory learning program for ESG practice' is designed by 'connecting ESG with Entrepreneurship' through over 20 years of experienced current teachers in elementary and junior·senior high school, professors in university and field experts in education. Analysis of learning effectiveness before and after the implementation of education program showed meaningful result in elementary and junior·senior high school. Thus, I would like to suggest a proposal based on concerns about 'What should we do to overcome the global crisis?" by paying attention to ESG from elementary school.