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이동섭,성치훈,이철호,최항석 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.7
A one-dimensional block-centered finite-difference model has been developed to estimate the rate of non-linear finite strain consolidation. The governing equations including the hydrodynamic and constitutive equations are presented. The hypothesis of the uniqueness of the End-of-Primary (EOP) void ratio – effective stress relationship is adopted to calculate the primary consolidation settlement. The explicit block-centered finite difference formulations and boundary conditions are presented and discussed. The developed model was compared with a point-centered finite-difference program, ILLICON to show the efficiency of the block- centered model. The block-center model provides an efficient tool to deal with interface boundaries and has advantageous ability to take into consideration the time-dependent loading, layered soil systems, and variable soil properties.
이동섭,조대승,김국현,전재진,정우진,강명환,김재호 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.1
Independent Component Analysis (ICA), one of the blind source separation methods, can be applied for extracting unknown source signals only from received signals. This is accomplished by finding statistical independence of signal mixtures and has been successfully applied to myriad fields such as medical science, image processing, and numerous others. Nevertheless, there are inherent problems that have been reported when using this technique: instability and invalid ordering of separated signals, particularly when using a conventional ICA technique in vibratory source signal identification of complex structures. In this study, a simple iterative algorithm of the conventional ICA has been proposed to mitigate these problems. The proposed method to extract more stable source signals having valid order includes an iterative and reordering process of extracted mixing matrix to reconstruct finally converged source signals, referring to the magnitudes of correlation coefficients between the intermediately separated signals and the signals measured on or nearby sources. In order to review the problems of the conventional ICA technique and to validate the proposed method, numerical analyses have been carried out for a virtual response model and a 30 m class submarine model. Moreover, in order to investigate applicability of the proposed method to real problem of complex structure, an experiment has been carried out for a scaled submarine mockup. The results show that the proposed method could resolve the inherent problems of a conventional ICA technique.
해난사고 분석을 위한 Full-mission Shiphandling Simulator(FMSS) : 한국해양수산연수원 FMSS를 기준으로
이동섭 한국항해항만학회 2011 한국항해항만학회 학술대회논문집 Vol.2011 No.춘계
다기능 선박조종시뮬레이터(Full-mission Shiphandling Simulator)는 항해사, 선장 및 도선사의 자질 향상을 위한 교육뿐만 아니라 항만개발을 위한 사전 검토와 해난사고 발생 시, 원인규명을 위한 분석에도 이용되고 있다. 한국해양수산연수원에서는 이러한 목적을 위하여 2011년 2월 28일 Russia Transas 제품의 선박조종시뮬레이터를 설치 완료 하였다. 이 FMSS는 적어도 360도의 수평시각을 가진 대형 구형화면에 여섯(6) 자유도 운동을 하는 본선 및 타선을 실시간으로 표현하는 photo-realistic high resolution computer graphic visual system과 같은 최신기술을 사용하는 가장 현대화된 최고급 해상용 시뮬레이터로 해난사고 윈인규명을 위한 분석 연구 목적을 위하여 광범위한 출처로부터 모델시험과 자료의 신뢰할만한 공식적 기록들에 근거한 매우 정확한 수력학적 선박 모델링 소프트웨어로 이루어졌다. 여기서는 이 FMSS의 형태와 복잡성을 상세하게 소개한다.
한국해역 Cochlodinium의 이상증식에 대한사고실험
이동섭 한국해양학회 2004 바다 Vol.9 No.4
최근 10여년 동안 적지 않은 경제적 손실을 가져온 만성적인 남해안 Cochlodinium 이상 증식의 발생 메커니즘과 구제 방안에 대해 물질보존과 수리생태학적 관점에서 사고실험을 시도 하였다. 그 동안 과학적인 해석의 대상에서 빠져 있었던 몇 가지 현장 정황에 대한 해석과 식물플랑크톤의 보존식에 대한 논의를 통하여 적어도 지금까지 통설로 여건왔던 것과는 다른 해석이 가능하였다. 부영양화 유발 주장의 과학적 근거는 취약한 것으로 판단되었고, 목표 생물을 박멸하는데 기초한 구제 방안은 환경친화적인 경쟁 부양으로 대체하는 것이 이론적 관점에서 바람직한 것으로 드러났다. 적조 발생 메커니즘에 대해서는 수렴-부상-결집 가설을 제시하고자 한다 Chronic Cochlodinium blooms in the southern waters of Korea have brought about considerable economic losses for about a decade, This paper aims to reframe current perspectives on the outbreak mechanism and the remediation schemes through a thought experiment in a context of mass balance and mathematical ecology. Far different explanations emerge from a careful examination of the scientifically unnoticed clues and a through discussion on the phytoplankton conservation equation. Logic of the eutrophication-induced red tide subjects to criticism. It is strongly recommended that the current remediation scheme to exterminate the target species should be rerouted to an environmentally sound competition enhancement tactics. Finally a novel convergence-float-aggregation hypothesis is proposed as an outbreak mechanism.
Reverse Blot Hybridization Assay를 이용한 강원지역에서의 인유두종바이러스 유전형의 분포도 조사
이동섭,김성현,박상정,진현우,김태우,박광화,이혜영 대한병리학회 2011 Journal of Pathology and Translational Medicine Vol.45 No.4
Background: Human papillomavirus (HPV) plays an important role in the development of cervical carcinoma. Although there is a general agreement that high levels of HPV are related to cervical cancer, the prevalence and distribution of HPV genotypes seems to vary by geographical region. This study was designed to investigate the prevalence of HPV genotypes in Gangwon Province, Korea. Methods: In total, 342 samples were examined by Pap smear and HPV-ID® reverse blot hybridization assay (REBA) (M&D, Wonju, Korea). Results: Overall HPV positivity was 80.9% and 64.4% in women with abnormal and normal cytology by REBA, respectively. The five most common HPV types were: HPV 16, 53, 58, 56, and 33 in samples with abnormal cytology, and HPV 16, 53, 58, 70, and 18 in samples with normal cytology. Conclusions: The REBA can provide useful data regarding prevalence of HPV genotypes. Gangwon Province showed high prevalence of HPV infection in women. The most common HPV type in Gangwon Province was HPV16, and HPV 53, 58, 56, 70 were frequently present.