• Steel and Composite Structures
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• 제41권6호
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• pp.887-898
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• 2021

This paper presents a simplified model to capture the nonlinear behavior of steel frames depending on the spread of plasticity method. New interaction formulae were derived to evaluate the plastic strength for I-shaped steel sections under uniaxial bending moment and axial compression load. Also, new empirical formulae were derived to evaluate the tangent stiffness modulus of steel I-shaped cross-sections considering the effect of the residual stresses suggested by the specifications in European Convention for Construction Steelworks (ECCS). The secant stiffness which depends on the tangent modulus is used to evaluate the internal forces. Based on stiffness matrix method, a finite element analysis program was developed for the nonlinear analysis of space steel frames using the derived formulae. Comparison between the proposed model results with those given by the fiber model shows very good agreement. Numerical examples were introduced to verify, check the accuracy, and evaluate the efficiency of the proposed model. The analysis results show that the new proposed model is accurate and able to minimize the solution time.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 춘계학술대회 및 창립 30주년 심포지엄(논문집)
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• pp.317-323
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• 2006

본 연구는 초대형컨테이너선 기항에 대비한 차세대 항만하역기술로 고층 장치시스템 개발을 다루고 있다. 고층 장치시스템은 한정된 부지내에서 처리능력을 극대화시킬 수 있는 시스템으로 기존의 컨테이너 터미널이 안고 있는 장치장 부족문제룰 일시에 해결할 수 있으며, 고성능 및 자동화가 가능하여 터미널의 하역생산성을 높일 수 있는 대안으로 평가된다. 이에 본 연구에서는 고층 장치시스템을 적용한 터미널의 설계개념도를 작성해 보았으며 시뮬레이션 기법을 이용하여 고층 장치시스템을 도입한 전용터미널의 하역능력을 분석해 보았다. 연구결과는 차후 실제 터미널 운영을 위한 기본 설계 및 상세설계의 기초자료로 활용될 수 있으며, 본 연구에서 제시하는 고층 장치시스템은 향후 기존 터미널 및 신규 터미널 개발에 적용하여 항만의 부가가치를 더욱 향상시키는 원동력이 될 것으로 본다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.2
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• pp.47-51
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• 2006

Among Solar activities' events, the geomagnetic storms are believed to cause the largest atmospheric effects. The geomagnetic storm is a complex process of solar wind/magnetospheric origin. It is well known to affect severely on the ionosphere. However, this effect of this complex process will maybe act at various altitudes in the atmosphere, even including the lower layer and the neutral middle atmosphere, particularly the stratosphere. Nowadays, the GPS-derived ZTD (zenith tropospheric delay) can be transformed into the precipitable water vapor (PWV) through a function relation, and further has been widely used in meteorology, especially in improving the precision of Numerical Weather Prediction (NWP) models. However, such geomagnetic effects on the atmosphere are ignored in GPS meteorology applications. In this paper, we will investigate the geomagnetic storms' effects on the middle atmosphere and troposphere (0-100km) by GPS observations and other data. It has found that geomagnetic storms' effect on the atmosphere also appears in the troposphere, but the mechanism to interpret correlations in the troposphere need be further studied.

• 한국항해항만학회지
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• 제36권7호
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• pp.545-552
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• 2012

Domestic marina facilities today consist mostly of composite-type marinas with particular spatial composition characteristics, due to the regulatory restrictions that keep their development in the public sector and the tepid growth of marine leisure-sports. To develop a marina club design appropriate for domestic conditions, this study establishes space program standards for designing Korean marinas based on a case analysis of existing marina clubs and a survey of floating marina clubs. It is possible for a current composite-type Korean marina club to have a spatial composition of 16~18% for marina-exclusive facility (mFA), 47~49% for commercial facility (cFA), 27~30% for public space (pFA) and 5~8% for management space (emFA). With this composition as a basis, space program estimation of a Korean marina club can be done through the process of estimating in order the marina-exclusive facility area, the floor area by each space and the total floor area, the first floor area, the deck area and the pontoon area. Since the space program established in this study can be utilized as a tool for designing a Korean marina club, it is expected to be helpful in designing marina clubs in the future.

• 한국항해항만학회지
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• 제30권6호
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• pp.541-549
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• 2006

본 연구에서는 부산 북항 재개발지역을 대상으로 하여 항만 재개발지역의 경관계획 특성을 알아보고 해외 항만재개발지역에서 경관계획사례를 살펴본 다음 북항 재개발지역의 경관현황을 분석하여 경관계획을 위해 선결해야 할 과제를 도출하고 마지막으로 경관계획을 위한 가이드라인을 제시하였다.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1998년도 추계학술대회 및 정기총회
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• pp.12-16
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• 1998

The purpose of this paper is to develop a knowledge-based real-time decision support system to support decision makers for efficient berth operation of Inchon Port. In these days, the efficient berth operation has been many studied. The berth operation rules differ from port to port and the problem is highly dependent on natural, geographical and operational environment of port. In Inchon Port, the ship's entrance into port and departure from port is extremely affected by the status of dock and berth because of capacity restriction. First, we analyzed the specific characteristics of Inchon Port such as dock based on the data of 1997. And then, we construct the database of experts knowledge for berth utilization. Finally, we build the real-time decision support system for the efficient berth operation of Inchon Port to make the better berth allocation in case of not only regular scheduling but also dynamic scheduling such as delay in berth operation and exchange of ship between berths. The DSS is developed with graphic user interface(GUI) concept to help the user determining user interactive updating of the port status. Then this DSS will be provide decision maker with an efficient and fast way to berth allocation, and reduce wastes of time, space, and manpower in Inchon Port operation.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 춘계학술대회 논문집
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• pp.451-456
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• 2004

본 연구에서는 장치장 운영규칙의 현실성을 높이기 위해서 트랜스퍼 크레인의 작업운영체계를 분석하고 작업우선순위의 적용을 위한 운영규칙의 적용방법을 설명하였다. 또한 장치장에서 주행로의 특성에 따른 대기 및 주행로 점거형태를 분석하여 블록에 진입하여 대기할 수 있는 최대 대기차량수를 도출할 수 있는 산정식을 정리하고 공간의 제약상태를 분석하였다. 또한 공간의 제약사항 극복하기 위해서 공간자원을 정의할 수 있는 다작업원칙을 제시하고 그 원칙을 위한 해법과 순서도를 묘사하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.505-510
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• 2006

SVLBI (Space Very Long Baseline Interferometry) has some important potential applications in geodesy and geodynamics, for which one of the most difficult tasks is to precisely determine the orbit of SVLBI satellite. This paper studies several technologies which possibly will be able to determine the orbit of space VLBI satellite. And then, according to the sorts and characteristicsof satellite and the requirements for geodetic study and the geometry of GNSS (GPS, GALILEO) satellite to track the space VLBI satellite, the six Keplerian elements of SVLBI satellite (TEST-SVLBI) are determined. A program is designed to analyze the coverage area of the space of different heights by the stations of the network, with which the tracking network of TEST-SVLBI is designed. The efficiency of tracking TEST-SVLBI by the network is studied, and the results are presented.

• 한국항해항만학회지
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• 제38권3호
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• pp.291-298
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• 2014

수변공간개발 사례를 중심으로 문화예술을 활용한 도시공간 재생의 의미를 이해해 보고자 한다. 특히 지역문화의 활성화를 핵심적인 의도로 가지는 문화도시전략에서 문화예술의 역할을 해항도시의 수변공간개발에서 문화정책 및 그 실현과정을 통해 고찰한다. 이를 위해 수변공간을 둘러싼 역사적 건축물이나 수변 경관 등 개성적이고 매력 있는 도시경관과 지역자원을 활용하여 문화예술공간 창출을 통한 성공적인 수변공간개발을 진행하고 있는 일본 요코하마를 대상으로 살펴본다. 요코하마는 일본의 '문화예술창조도시' 전략의 일환으로 '창조도시 요코하마'라는 문화정책을 펼치고 있는데, 그 중 공간계획정책이라고 할 수 있는 '내셔널 아트 파크 구상'은 문화예술공간 창출을 통해 수변공간 재생을 실현하고 있다. 이 사업의 기본적 의도와 구체적 실행과정 등을 살펴봄으로써 해항도시의 수변공간개발에서 문화예술이 가지는 역할을 이해하고 수변공간 재생에 있어서 문화정책의 방향성에 대해 검토한다.

• Journal of Advanced Marine Engineering and Technology
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• 제22권1호
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• pp.100-107
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• 1998

Ventilation of the marine engine room is very important for the health of the workers as well as the nomal operation of machines. To find proper ventilation conditions of this engine room, numerical simulation with standard k-.epsilon. model was carried out. In the present study, the marine engine room is considered as a closed space with a heat source and forced ventilation ducts. The injection angle of air supply is found to be important. Injection with downword angle depresses recirculation flow, causing a strong steam in the wider space of the room. Ventilation and removal of the released heat are promoted with this pattern. There is a possibility of local extreme heating at the upper surface of engine when supply and exhaust ports of air are in bilateral symmetry. The effect of the increase of exhaust port area on ventilation decreases as the number of supply port increases.