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- 저자 : Myeong-Gyun Son (검색결과 4 건)
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직접구조강도 평가를 위한 선체 국부구조 상세요소분할모델 자동생성
손명조(Myeong-Jo Son),우정재(Jeong-Jae Woo),박호균(Ho Gyun Park),이정렬(Jeong-Youl Lee) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.3
Under the circumstances of Common Structure Rules for Bulk Carrier and Oil Tanker (CSR-H; Harmonized Common Structure Rules) which is on effective from July 2015, the modeling area for finite element (FE) has been extended to forward and afterward cargo hold regions of a ship, more design man-hours are required in the FE modeling than that of previous rules. In addition, it is mandatorily required to generate the fine-mesh model for hot spot zones, but the target area has been extended so extensively, more design man-hours are required for fine-mesh modeling than that of coarse mesh modeling. Moreover, the local area for fatigue analysis should be modeled with very fine-mesh. However, these kinds of FE modeling for different level of detail and different purpose of analysis are time consuming and repetitive works. In this research, we would like to introduce the auto fine mesh modeling functionality that can generate fine-mesh and very-fine mesh model from the coarse mesh model, and retrieve and restore them to coarse mesh for certain purpose by re-mesh functionality. Through this process, FE model can be managed and reused with a consistent FE model from the initial design stage to detailed design stage of a ship.
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조선 기본구조설계 단계에서의 3D CAD/CAE 인터페이스 개발
손명조(Myeong-Jo Son),이정렬(Jeong-Youl Lee),박호균(Ho Gyun Park),김종오(Jong-Oh Kim),우정재(Jengjae Woo),이정현(JoungHyun Lee) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.2
The finite element modeling of a ship for hull structural analysis on the basis of new harmonized common structural rules (CSR-H) is to be extended to the cargo holds in fore and after body of a ship. Unlike the parallel middle-body where the external and internal features of hull are equal along to the longitudinal direction of a ship, in fore and after body, the external and internal features of hull vary linearly or even irregularly in forms of a surface or a curve along to the longitudinal direction of a ship. Thus, it needs lots of design man-hours for the modeling for structural analysis. In order to save man-hours in initial structural design phase of a ship, the specified 3D CAD system has been adopted in shipbuilding industry. Through the interface between CAD and CAE (rule scantling and direct strength assessment), design man-hour in initial design phase can be saved even under the environment of CSR-H.
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모회사 뉴스 감성을 이용한 딥러닝 기반 자회사 주가 등락 예측
이호정(Lee Ho Jung),손명균(Son Myeong Gyun),황병현(Hwang Byeonghyeon),윤고은(Youn Go Eun),전수현(Jeon Su Hyeon) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
본 연구는 모회사의 뉴스 감성이 자회사의 주가 등락에 영향을 주는지 파악하기 위해 네이버 뉴스를 수집하여 분석하였다. 뉴스의 감성을 처리하기 위해 KoELECTRA를 사용하였으며, 주가 등락 예측 모델로는 LSTM을 사용하였다. sequence size별 예측을 진행했으며 분석 결과, 모회사의 뉴스가 주가 등락에 영향을 끼쳤음을 확인하였다. This study used to KoELECTRA to collect and analyze Naver news to understand whether the sensitivity of parent company news affects the stock price of subsidiaries, and used LSTM as a predictive model of stock price fluctuation. We made predictions by sequence size, and as a result of the analysis, we confirmed that the news of the parnet company affected the stock price.
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Hyo-Jung Kim,Iel-Yong Sung,Yeong-Cheol Cho,Min-Su Kang,Gyu-Jin Rho,June-Ho Byun,Won-Uk Park,Myeong-Gyun Son,Bong-Wook Park,Hyeon-Jeong Lee,Young-Hoon Kang 한국조직공학과 재생의학회 2019 조직공학과 재생의학 Vol.16 No.6
BACKGROUND: Enhancement and maintenance of the stemness of mesenchymal stem cells (MSCs) is one of the most important factors contributing to the successful in vivo therapeutic application of these cells. In this regard, threedimensional (3D) spheroid formation has been developed as reliable method for increasing the pluripotency of MSCs. Moreover, using a new protocol, we have previously shown that dental tissues of extracted wisdom teeth can be effectively cryopreserved for subsequent use as a source of autologous stem cells. The main purpose of this study is to analyze the stemness and in vitro osteogenic differentiation potential of 3D spheroid dental MSCs compared with conventional monolayer cultured MSCs. METHODS: In this study, MSC-characterized stem cells were isolated and cultured from long-term cryopreserved dental follicles (hDFSCs), and then 2D hDFSCs were cultured under 3D spheroid-forming conditions using a newly designed microchip dish. The spheroids (3D hDFSCs) thus produced were investigated and characterized with respect to stemness, MSC marker expression, apoptosis, cell cycle analysis, extracellular matrix (ECM) production, and osteogenic and adipogenic differentiation properties. RESULTS: In terms of MSC and senescence markers, spheroid cells showed no difference when compared with 2D hDFSCs; however, 3D hDFSCs were observed to have a higher proportion of cell cycle arrest and a larger number of apoptotic cells. Moreover, spheroids showed substantially increased levels of pluripotency marker (early transcription factors) and ECM protein expression. Compared with 2D hDFSCs, there was also a notable enhancement in the osteogenic induction potential of spheroids, although no differences were observed with respect to in vitro adipogenesis. CONCLUSION: To the best of our knowledge, this is the first study to demonstrate the application of a spheroid culture system for dental follicle-derived stem cells using a microchip dish. Although further studies are needed, including in vivo transplantation, the results obtained in this study indicate that spheroid hDFSCs derived from cryopreserved dental follicle tissues could be used as a valuable source of autologous stem cells for bone tissue regeneration.
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