• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.6 no.6
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• pp.469-477
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• 2016

This study develops an approach to assign numbers of facilities (rectangular shape) in a given plant and compares the test results by proposed approach with those by approaches in the literature. An improvement approach is proposed to minimize material handling cost given initial layout. Like popular heuristic approaches, the developed heuristic approach employs interchange routine to improve material handling cost in current layout. Horizontal interchange and vertical interchange procedures are applied to obtain better solution. Also, it is possible to rotate facility layout when the sizes of both facilities are same. However, the proposed approach generates good solutions without shape distortion. That means the shape of facilities remains rectangle in the final solution. In addition, the improve approach can find global optimal solution from local optimal solution by applying Tabu search technique. Based on 25 test problems in the literature, we obtained better solutions than other facility layout approaches in the literature when there are many facilities.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.11a
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• pp.297-302
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• 2004

This paper analyzed productivity of quay cranes on container terminal that have perpendicular yard layout block. In most existing container terminals, quay cranes of single trolley type are used to loading and unloading containers, but quay crane productivity of these type has many limitation about large size containership. For these reasons, recently quay cranes of various type that mn improve productivity are developed and as the representative example, dual trolley, double trolley, supertainer are developing. These cranes are realized that very high productivity bemuse their cycle time is short more than existent single trolley quay crane. Therefore, we analyzed productivity of these cranes that are realized by next generation crane alternatives and as result qf this research, mechaniml productivity by cycle time and net productivity by simulation were measured.

• Journal of Navigation and Port Research
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• v.29 no.6 s.102
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• pp.547-553
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• 2005

The purpose of this paper is to evaluate the quay crane productivity in automated container terminal with perpendicular yard layout. In particular, four quay crane (single trolley/dual trolley/double trolley/supertainer) are considered to evaluate the productivity on the terminal performance. Each quay crane load or unload containers by a different process. For each quay crane, two productivities are considered and compared: mechanical productivity, net productivity. As the net productivity of quay crane is significant, in this paper, an application of simulation model to simulate automated container terminal is developed and a wide variety of computational experiments were conducted.

• Journal of Korean Society of Steel Construction
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• v.19 no.2
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• pp.147-160
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• 2007

In this paper, we described the aeroelastic full-bridge model tests that were conducted to investigate the effect of alternative temporary stabilizing measures for thecable-stayed bridge during construction to ensure aerodynamic stability in the event of a typhoon or similar disasters. The effect of alternative temporary stabilizing measures was investigated through various configurations on two cable-stayed bridges with a main span of 475 m and 230 m, respectively. To investigate the bridge's aerodynamic behaviour and dynamic wind force during construction, the deflections at the end of the cantilever, the accelerations atthe top of the pylon and the moments at the lower part of the pylon were measured. As the result, the system with two sets of vertical cables per cantilever seemed to be the overall most effective solution, but the system with single vertical cable may also work. The combined system using the caisson support and vertical cables and the system with two sets of inclined cables per cantilever on the same anchor block may also be a solution. The inclined cables from the caisson to the girder were effective for some early stages of erecting the deck.

• Journal of Korean Society of Steel Construction
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• v.22 no.4
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• pp.325-334
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• 2010

In this study, an unbraced five-story steel-framed structure was designed in accordance with KBC2005 to understand the features of structural behavior for the arrangement of semi-rigid connections. A pushover analysis of the structural models was performed, wherein all the connections were idealized as fully rigid and semi-rigid. Additionally, horizontal and vertical arrangements of the semi-rigid connection were adopted for the models. A fiber model was utilized for the moment-curvature relationship of the steel beam and the column, and a three-parameter power model was adopted for the moment-rotation angle of the semi-rigid connection. The top displacement, base-shear force, required ductility for the connection, sequence of the plastic hinge, and design factors such as the overstrength factor, ductility factor, and response modification coefficient were investigated using the pushover analysis of a 2D structure subjected to the equivalent static lateral force of KBC2005. The partial arrangement of the semi-rigid connection was found to have secured higher strength and lateral stiffness than that of the A-Semi frame, and greater ductility than the A-Rigid frame. The TSD connection was found suitable for use for economy and safety in the sample structure.

• Journal of the Korean Society for Marine Environment & Energy
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• v.18 no.4
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• pp.274-281
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• 2015

Thermal and nuclear power plants on shore commonly use the sea water for cooling facility. Discharged cooling water has the high kinematic energy potential due to amount of water flux. Numerical analysis was made to find the suitable combinations between the arrangement of tidal turbines and the overall dimensions of the discharged channel. Several parameters such as the turbine diameter to inlet size, and the axial distance to turbine size were investigated. Power coefficients for various test conditions were also compared to see the effect of inlet configurations such as single inlet and dual inlet. For the single inlet, the mean power coefficient appeared to be gradually decreased with increasing distance, and the maximum power was obtained when the turbine diameter was same as the inlet diameter. For the dual inlet, the tendency was similar so that the better result when the turbine diameter was same as the inlet diameter. It is expected that the present methodology can be extensively utilized to harness the high kinetic energy flow of the discharge channel of power plant.

• Proceedings of the KIEE Conference
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• 2004.11d
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• pp.106-109
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• 2004

축구 전용 경기장에서 캐노피에 설치되는 등기구의 위치를 Pattern Search법을 이용 컴퓨터 시뮬레이션하여 조명 등기구 배치간격을 변화시킴으로 국 내외 (FIFA, 유럽방송연맹, KS) 기준에 명시된 수평면 조도, 수직면 조도, 균제도, 눈부심 정도에 적합한 최적의 값을 찾아내어 향후 국내 축구 전용 경기장 조명기구의 설계 및 시공, 유지관리 보수시 많은 참고가 되었으면 한다.

• Proceeding of EDISON Challenge
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• 2015.03a
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• pp.623-626
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• 2015

본 연구에서는 CFD 해석 프로그램 EDISON_CFD를 통하여 2차 세계 대전에 소련에서 제작한 복엽기 AN-2의 기체를 기본 모델로 하여 설제 기체에 사용된 TSAGI P-II-14 airfoil를 이용, 기본 모델의 상단 주익과 미익은 고정하고 하단 주 날개의 위치를 변화시켜 공력특성을 분석하였다. 익형의 평행배치의 경우 기본모델에 비해 양력은 적은 크기로 증가하나 항력이 급격히 증가하여 가장 양항비가 낮은 비효율적인 공력 해석 결과를 보였고 복염기 하단 주익의 돌출은 상단 주익의 돌출에 비해 미세한 양력 감소와 항력 증가를 보여 양항비가 감소하는 현상을 보였다. 상, 하단 주익의 상하 간격이 커질수록 양력은 중가, 항력은 감소하며 간격이 작아질수록 양력의 감소와 항력의 증가를 보였다. 본 연구 해석 결과에 따라 순항조건에서의 익형은 상,하 주익간 수직 간격을 넓게 배치하는 것이 가장 효율적으로 볼 수 있다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.05a
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• pp.39-40
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• 2018

The goal of site layout planning(SLP) is to maximize the productivity and efficiency of the construction by reducing travel distance and material handling cost and manpower. However, SLPs are static layout schemes, which cannot be reorganized during the construction process to correspond with errors, phase transition, changing working environments on the site. To solve this problem, researches on dynamic site layout planning(DSLP) are emerging. This preliminary study clarifies characteristics of temporary facility's variables to develop the vertical DSLP algorithm of high-rise building construction.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.179.1-179.1
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• 2012

정지궤도 복합위성 2호는 현재 기상 및 해양관련 관측임무를 수행중인 천리안위성의 임무승계를 위해 현재 개발이 진행 중이다. 천리안위성에 비해 수명이 확대되고, 임무 탑재체의 중량도 증가하여 추진제량의 대폭 증가가 필요한 것으로 분석되고 있다. 이로 인해 추진제 탱크의 확장이 불가피하여 현재 가용한 탱크를 기반으로 구조체 설계에 대한 비교 연구가 수행되었다. 정지궤도위성의 추진제 탱크 수용은 크게 측면 고정식 구형 탱크의 수직 배치방식과 극 고정식 실런더형 탱크의 수평 배치방식으로 구분된다. 추진제량 확대에 따라 두가지 방식 모두 구조체 내부에 충분한 강성확보와 하중전달을 목적으로 튜브형 구조물이 적용되며, 이를 토대로 구조체 설계가 이루어 진다. 본 논문에서는 이러한 추진계 탱크 수용 방식을 기반으로 정지궤도 복합위성에 적용될 구조체 설계 개념을 제시하고, 비교 연구를 통해 각 방식이 갖는 구조체 설계의 장단점을 기술하고자 한다.