• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.6
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• pp.565-572
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• 2009

This work intends to establish the reliability and fracture toughness $K_{IC}$ criterion of welded joints by EGW for high strength EH36-TMCP ultra thick plate. For this, firstly thermo elasto-plastic analysis has been carried out on two pass X-groove butt joint model to clarify the thermal and mechanical behaviour(residual stress, plastic strain, magnitude of stress and their distribution and production mechanism). Moreover, to establish fracture criterion, analysis of fracture toughness $K_{IC}$ has been performed under the notch machined and residual stress with the load condition on EGW welded joints. A quantitative fracture criterion for EGW welded joints is suggested by using $K_{IC}$.

• Proceedings of the KIPE Conference
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• 2016.11a
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• pp.111-112
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• 2016

본 논문에서는 일반적인 스위치드 릴럭턴스 전동기(Switched Reluctance Motor, SRM)의 고정자 철심에 영구자석과 조합된 구조를 가지는 하이브리드형 스위치드 릴럭턴스 전동기(Hybrid SRM, HSRM)을 제안하였다. 제안된 HSRM은 기존 블렌더용 2상 4/2극 SRM의 인덕턴스 및 토크 특성과 비교하였다. 그 결과 제안된 HSRM은 높은 토크 출력 및 소형화가 가능함을 확인하였다.

• Computational Structural Engineering
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• v.2 no.2
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• pp.6-13
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• 1989

현재 구조해석의 컴퓨터 응용과 건축설계도면작성의 컴퓨터 응용이 개별적으로 개발되는 경우가 많은데 한꺼번에 모든 시스템을 일련으로 연결하는 것은 쉬운 일이 아니므로, 우선 구조해석의 자료를 그대로 이용할 수 있는 골조도면작성의 컴퓨터 응용프로그램을 개발함으로써 앞으로 건축설계도면작성 프로그램과 연결도 고려할 수 있다고 본다. 본 CAD시스템은 현재에는 국내에서 통용되고 있는 건설부 규준에 의거하여 개발되었고, ACI의 극한강도 설계법으로 sub-program을 수정하여 이용할 수 있겠다.

• Journal of Navigation and Port Research
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• v.31 no.1 s.117
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• pp.21-27
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• 2007

The wave load and its influence on the response of offshore structure have been well investigated through the statistical approach based on the linear theory. The linear approach has a limitation to apply the extreme condition such as extreme wave, which corresponds to extreme value of wave spectrum. The main topic of present study is to develop an efficient numerical method to predict wave load induced by extreme wave. As a numerical method, finite element method based on variational principle is adopted. The frequency-focusing method is applied to generate the extreme wave in the numerical wave tank. The wave load on the bottom mounted vertical cylinder is investigated. The hydroelastic response of the vertical cylinder is also investigated so as to compare the wave loads with the rigid body case in the extreme wave condition.

• Journal of the Korean Geotechnical Society
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• v.25 no.2
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• pp.37-44
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• 2009

In this study, estimation methodology for the pile of ultimation lateral resistance, pu, and ultimate lateral capacity, Pu, is based on the CPT cone resistance $q_c$. Preexistent methodologies for ultimate lateral resistance and ultimate lateral capacity have been generally represented with relative density, vertical effective stresses, and various $K_0$ values which are important for analyzing sandy soil. These methodologies, however, did not consider the horizontal effective stress and the effects of construction site conditions. Therefore, CPT-based methodology for the estimation of the ultimate lateral pile load capacity Hu was proposed. Calibration chamber test results were analyzed and compared with calculated results. The proposed estimation methodology for the pile of $p_u$ can be effectively utilized as alternative to preexistent methods.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.5B
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• pp.459-473
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• 2008

This study investigated typhoon characteristics that provoke precipitation which is much attacking periodically in our country, and calculated probability precipitation of extreme rainfalls using Empirical Simulation Technique. The typhoon influenced in Korea was happened 3.18 times per, and year exposed to affect Korea during 107 hours. The depth of precipitation with the typhoon was different according to observation points. The extreme precipitation of typhoon events has analyzed by change and trend analyses. In the results, mean and standard deviation of extreme rainfall has been increasing than the past events in some areas. Also, About 143 typhoons influenced Korea was applied in EST techniques using center position, central pressure, time precipitation data using rainfall observatory in Korea. Therefore, we applied EST techniques and calculated probability precipitation. In the results, Jeonla-do, Gyeongsang-do and Gangwon-do will have heavy rain with typhoon events in high probability.

• The Journal of the Korea Contents Association
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• v.22 no.9
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• pp.156-168
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• 2022

This study was conducted to investigate the staging principle, the staging work and the trial performance of Shingeuk troupe Geukyesulyeonguhoe during the period of coterie system, focusing on Gogol work·Ham Daehoon translation·Hong Haeseong directing's (5Act). As a result, the first trial performance was based on a faithful full-scale description rather than an interpretive directing of play. It was a performance that focused on copying and implanting the external form of the performance stage of Shingeki troupe Tsukiji Little Theater. The general review of the time was summarized to the point that it was a relatively successful performance that exceeded expectations as a trial demonstration of amateur actors. However, in terms of the content of play and the form of performance, reservations and lack of contemporary(modern) interpretation caused the problem that the general audience was alienated. Therefore, it was difficult to achieve the effect of reflecting the reality of Chosun through , as Geukyesulyeonguhoe intended.

• Journal of Advanced Marine Engineering and Technology
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• v.37 no.4
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• pp.344-350
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• 2013

The purpose of this study is to examine the structural stability of a low speed 200 W class gyromill type vertical axis wind turbine system. For the analysis, a commercial code is adopted. The pressure distribution on the rotor blade surface is examined in detail. In order to perform unidirectional FSI(Fluid-Structure Interaction) analysis, the pressure resulted from CFD analysis has been mapped on the surface of wind turbine as load condition. The rotational speed and gravitational force of wind turbine are also considered. The results of FSI analysis show that the wind turbine reveals an enough structural margin. The maximum structural displacement occurs at trailing edge of blade and the maximum stress occurs at the strut.

• Magazine of the Korea Concrete Institute
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• v.6 no.2
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• pp.159-168
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• 1994

The present study proposes a realistic method to analyze the prestressed concrete members subjected to torsion. For this end, this study devises a method to realistically take into account the tensile stiffness of concrete after cracking. The effects of biaxial compressive and tensile loadings on the compressive and tensile strengths of concrete are also taken into account in the present model. The comparison of the present theory with experimental data indicates that the proposed model dipicts reasonably well the actual behavior of prestressed concrete members subjected to torsion. The present model can predict not only the service load behavior, but also up to the behavior of ultimate load stages.

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.337-337
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• 2019

지구 온난화에 따른 기후변화로 인하여 태풍, 폭염, 홍수 및 가뭄 등과 같은 다양한 자연재해는 해마다 증가하고 있으며, 이에 따른 사회적 우려의 목소리가 커지고 있다. 특히 극한 강우와 홍수는 막대한 재산피해와 인명사고 등과 같은 재난에 직결된다. 자연재해에 대한 피해를 사전에 방지하기 위해서는 수자원 시스템을 이해하고, 미래 기후변화를 고려하는 것이 중요하다. 이미 많은 국가들은 기후변화에 대한 영향을 분석하고, 이에 적응하기 위한 노력을 하고 있다. 일반적으로 기후 모델로부터 생산된 모의자료를 이용하여 현재기간에 대비한 미래기간의 변화를 분석하게 되며, 이미 수문통계학 분야에서는 미래 강수량 변화를 살펴보기위해 다양한 연구가 수행되었다. 본 연구는 HadGEM3-RA 기후 모델의 강수 자료에서 연최대 자료를 추출하였고, 이를 이용하여 비정상성 지역빈도해석을 수행하였다. 지역빈도해석 방법은 홍수지수법(index flood method)을 이용하였고, 대상유역으로 한강유역을 선정하여 적용하였다. 또한 RCP(Representative Concentration Pathways) 시나리오는 RCP 4.5와 RCP 8.5를 적용하였으며, 각 시나리오에 따른 강수량 변화율은 전망 기간(S0:1979-2005, S1:2011-2040, S2: 2041-2070, S3:2071-2100)에 따라 비교 분석하였다.