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신영식,우광성,안재석,Shin, Young-Sik,Woo, Kwang-Sung,Ahn, Jae-Seok 한국전산구조공학회 2009 한국전산구조공학회논문집 Vol.22 No.3
이 논문에서는 복합재료 적층판 해석을 위해 등가단층요소와 부분-선형 층별 적층요소를 서로 연계시킨 결합요소를 제안하였다. 등가단층요소는 퇴화 쉘요소에 의해 정식화되었으며, 반면에 부분-선형 층별요소의 경우 면내변위는 부분적 선형변화로, 두께방향으로의 면외변위는 일정하다고 가정하였다. 제안된 유한요소모델은 p-수렴방식에 기초를 두고 있다. 변위장 보간을 위해 적분형 르장드르 다항식이, 수치적분을 수행하기 위해서는 가우스-로바토 적분을 각각 채택하였다. 이 연구에서는 주로 p-수렴 결합요소의 검증을 위해 다양한 형태의 유한요소 다중모델에 대해 안정된 수치해석값을 보여주는 지에 초점을 두었다. 채택한 예제는 정해를 쉽게 알고 있는 단순한 문제로 인장력을 받는 평판 또는 연직하중을 받는 캔틸레버보에 적용하여 제안된 요소의 성능을 평가하였다. This paper presents the p-convergent coupling element on the basis of the ESSE(equivalent single layer shell element) and the PLLE(partial-linear layerwise element) to analyze laminated composite plates. The ESSE is formulated by the degenerated shell theory, on the other hand, the assumption of the PLLE is piecewise linear variation of the in-plane displacement and a constant value of lateral displacement across the thickness. The proposed finite element model is based on p-convergence approach. The integrals of Legendre polynomials and Gauss-Lobatto technique are chosen to interpolate displacement fields and to implement numerical quadrature, respectively. This study has been focused on the verification of p-convergent element. For this purpose, various finite element multiple models associated with the combination of ESSE and PLLE elements are tested to show numerical stability. The simple examples such as a cantilever beam subjected vertical load and a plate with tension are adopted to evaluate the performance of proposed element.
신영식(Young Sik Shin),이현석(Hyun Seok Lee) 건국대학교 부동산도시연구원 2017 부동산 도시연구 Vol.9 No.2
본 연구는 국토교통부의 2014년 신혼부부 주거실태조사를 활용하여 신혼부부 전체, 차가 신혼부부의 주택점유형태가 어떠한 요인에 의해 결정되는지 분석한다. 특히 본 연구에서는 신혼가구를 직접 설문조사하여 지역적, 표본수의 제한이 있는 것과 달리 정책에 부합되는 요소로 신혼부부를 정의하고, 전국표본을 활용하고 소득변수를 다양하게 설정하여 모형을 추정하였다. 분석결과, 자가/차가 결정에 영향을 주는 요인들은 기존의 연구결과와 크게 다르게 나타나지 않았다. 하지만, 부모의 지원과 주택에 대한 대출이 있을수록 자가의 형태로 거주할 확률이 높은 것으로 나타났다. 또한 주택에 대한 대출이 가능하거나 수도권 지역에 거주하는 가구일수록 전세점유 확률이 높은 것으로 나타났다. 신혼가구에 대한 주택정책 수립의 중요성이 증가할 것으로 예상되므로 신혼부부의 주택점유형태 결정 요인에 대한 보다 세밀한 연구와 관심이 필요하다고 판단된다. This paper examines factors influencing housing choices of the newly-married households, using the 2014 Housing Survey data by the Ministry of Land, Infrastructure and Transport. In this paper, newly-married households are defined from policy purposes, which allows the use of nation wide samples and various income variables. The result of the study shows that there are clear differences of socio-demographic characteristics between homeowners and tenants for newly-married households. The probability of choosing owning is greater if they are helped by housing assistance loans or aids of parents. The probability of choosing Chonsei is higher if there are housing loans and the location is closer to the metropolitan area.
유리기판 박막화를 위한 습식공정에서 식각액 성분의 영향
신영식 ( Young Sik Shin ),이원규 ( Won Gyu Lee ) 한국화학공학회 2020 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.58 No.3
유리기판의 박막화를 위한 식각액을 제조하였고, 습식 식각액의 주성분으로 HF를 사용하였다. HF를 기본으로 한 식각액에 HCl, HNO<sub>3</sub>, H<sub>2</sub>SO<sub>4</sub>와 같은 강산과 구연산과 같은 카르복실산 그리고 여러 종류의 아미노산을 첨가물로 각각 사용한 식각액으로 유리의 식각속도와 표면형상의 변화를 측정하였다. 강산의 종류와 상관없이 첨가량이 증가함에 따라 선형적으로 유리의 식각속도가 증가하였으며 유리표면의 슬러지 제거효과도 나타내었다. HCl이 함유된 식각액이 식각속도의 증가율과 슬러지 제거 효과에서 다른 강산보다 효율적인 결과를 보였다. 카르복실산의 첨가는 식각속도에 영향을 크게 주지 않으나 슬러지 제거효과를 보였다. 하지만 아미노산을 첨가한 경우에는 식각속도의 변화와 슬러지 제거 효과가 크지 않았다. The etching solution for slimming of glass substrates was manufactured and HF was used as the main ingredient of wet etching solutions. Various types of strong acids such as HCl, HNO<sub>3</sub>, H<sub>2</sub>SO<sub>4</sub>, amino acids and carboxylic acids such as citric acid, and etched solutions, respectively, were used to measure the etching rates and changes in surface shape of the glass. Regardless of the type of strong acids, the etching rate of the glass increased linearly as the added amount increased, and the sludge removal effect of the glass surface was also shown. The etching solution containing HCl showed more efficient results than other strong acids in the etching rate and the effect of removing sludge. The addition of carboxylic acid did not significantly affect the variation of etching rate, but had the effect of removing sludge. However, if amino acids were added, changes in etching rate and sludge removal were not significant.
신영식(YOUNG-SIK SHIN),박명규(MYUNG-KYU PARK) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.2
In this paper a complicated structural behavior in collision and its effect of energy transmission to the collision bulkhead was examined through a methodology of the numerical simulation to obtain a ideal bow construction and a location of collision bulkhead against head on collision. At present the bow structure is normally designed in consideration of its specific structural arrangements and, internal and external loads in these areas such as hydrostatic and dynamic pressure, wave impact and bottom slamming in accordance with the Classification rules, and the specific location of collision bulkhead by SOLAS requirement. By these studies the behavior of the bow collapse due to collision was synthetically evaluated for the different size of tankers and its operational speed limits, and by the results of these simulation it provides the optimal design concept for the bow construction to prevent the subsequent plastic deformation onto or near to the collision bulkhead boundary and to determine the rational location of collision bulkhead.
신영식(YOUNG-SIK SHIN),박명규(MYUNG-KYU PARK) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.3
The potential pollution problems resulting from tanker collision necessitate the requirement for an effective structural design and the development of relevant safety regulations. During a few decades, the great effort has been made by the International Maritime Organization and the Administration, etc, to reduce oil spillage from collision accidents. However there is still a need for investigation in the light of structural evaluation method for the experiments and rational analysis, and design development for an operational purpose of ships. This study aims for investigating a complicated structural response of bow structures of simplified models and oil carriers for assessing the energy dissipation and crushing mechanics of the striking vessels through a methodology of the numerical analysis for the various models and its design changes. Through these study an optimal bow construction absorbing great portion of kinetic energy at the least penetration depth prior to reach to the cargo area and an effective location of collision bulkhead are investigated In order to obtain a rational results in this study, three stages of collision simulation procedures have been performed step by step as follows;<br/> 1) 16 simplified ship models are used to investigate the structural response against bow collision with variation of primary and secondary members. Mass and speed are also varied in four conditions.<br/> 2) 21 models consisted of 5 sizes of the full scaled oil carriers are used to perform the collision simulation with the various sizes and deadweight delivered in a recent which are complied with SOLAS and MARPOL.<br/> 3) 36 models of 100k oil carrier are used to investigate the structural response and its influence to the collision bulkhead against bow collision in variation with location of collision bulkhead primary members, framing system and colliding conditions, etc.<br/> By the first study using simplified models the response of the bow collision is synthetically evaluated for the parameters influencing to the absorbed energy, penetration depth and impact force, etc.
항법 적용을 위한 수중 소나 영상 처리 요소 기법 비교 분석
신영식(Young-Sik Shin),조영근(Younggun Cho),이영준(Yeongjun Lee),최현택(Hyun-Taek Choi),김아영(Ayoung Kim) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.3
Imaging sonars such as side-scanning sonar or forward-looking sonar are becoming fundamental sensors in the underwater robotics field. However, using sonar images for underwater perception presents many challenges. Sonar images are usually low resolution with inherent speckled noise. To overcome the limited sensor information for underwater perception, we investigated preprocessing methods for sonar images and feature detection methods for a nonlinear scale space. In this paper, we focus on a comparative analysis of (1) preprocessing for sonar images and (2) the feature detection performance in relation to the scale space composition.