• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2007년도 추계학술대회 및 제23회 정기총회
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• pp.365-372
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• 2007

과학기술과 항해기기의 발달에 맞추어 항로표지의 지원기능도 변해야 하므로 이에 대한 역할 재정립이 필요하다. 항계내에서도 늘어가는 배경광에 대한 대책 및 항계내의 항로를 가로지르는 교량과 선박과의 충돌방지를 위하여 교량의 시인성 개선방안이 필요하다. 항로표지의 설치원칙과 설치기법 부두와 교량 시설물의 접현 등화를 이용하여 이들의 시인성을 개선하는 방안 및 교량부근에서 선박이 바람과 조류 등 외력에 의하여 표류하는 정도를 인식하여 교각과의 충돌방지에 도움이 되는 중시등화의 시설 등에 대하여 이용자의 시각으로 기술한다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2003년도 추계 학술발표회논문집
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• pp.288-294
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• 2003

Increasing the volume of traffic on the roads causes social and economical problems such as increasing air-pollution and distribution cost. Prefabricated light weight bridge becomes a possible solution for these problems in the urban area where it is difficult to construct new one or expend the existing road. There are some merits in this kind of bridge. First, the design live and dead loads are minimized by allowing only passenger cars. Second employing prefabrication construction scheme reduces the construction time. Third, there is no need to buy land if the elevation road is placed on the top of existing one. In seismic design of bridges, base isolation has been an effective solution when the bridge has stiff piers and a heavy superstructure. The prefabricated light weight bridge has different dynamic characteristics from the ordinary bridges. In this paper, the applicability of base isolators such as lead rubber bearing and elastomeric bearing, to prefabricated light weight bridge is examined.

• Structural Engineering and Mechanics
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• 제29권4호
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• pp.381-390
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• 2008

This paper proposed a conceptual design of bascule bridge, which is a new kind of movable bridge with an aim of reducing the weight of superstructure. Compared with the traditional bascule bridge, the light bascule bridge chooses cable-stayed bridge with inclined pylon as its superstructure; therefore, the functions of balance-weight and structure will fuse into one. Otherwise, it adopts moving counterweight to adjust its center of gravity (CG) to open or close the bridge. In order to lighten the superstructure, it uses contact springs to auxiliary retract, and intelligent prestressing system (IPS) to control the main girder's deformation. Simultaneously the vibration control scheme of structure is discussed. Starting from establishing the mechanical model of bridge, this article tries to analyze the conditions that the design parameters of structure and attachments should satisfy to. After the design procedure was presented, an example was also adopted to explain the primary design process of this kind bridge.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.333-336
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• 2009

장비의 리액터브 성분의 물리적 크기를 저감하고 동특성을 개선하기 위하여 동작스위칭 주파수를 증가 시키는 것이 우수하나 이러한 방식은 발열과 스트레스로 인한 전력소자의 파괴, 스위칭손실 증가로 인한 효율 감소등 다양한 문제가 발생하게 된다. 따라서, 본 논문에서는 이러한 문제점을 해결하기 위해 보조장치를 응용한 기동전류 회로를 적용한 하프브리지 방식의 Intense Pulse Light를 제안 하였다. 시뮬레이션 및 실험결과를 통해 20% 향상을 가져와 환자에게 보다 더 질적인 측정을 할 수가 있다고 확인하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.365-375
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• 2006

The HR Plates made hot rolled coils is lower than general structural steel plates in price. No difference between general steel plates and HR Plates with thickness up to 22mm are found in most characters such as cutting operation, fabrication and even welding. It can be concluded that HR Plates with thickness up to 22mm can be applied to flanges and webs of any girders as well as longitudinal ribs, longitudinal and vertical stiffeners of steel bridges appropriately. To increase the demand of HR Plates with thickness up to 22mm, it is necessary that HR Plates is applicable to full member in steel bridge including main girder.In this study, availabilities of the narrow steel box girder of light railway transit with HR Plate width as a main member are discussed. For application of HR Plate to steel bridge with 50m span or more, new support systems in three types are presented. Computational analysis is performed in 15 bridge models of light railway transit with beam element and plate element. As a analysis results, three models in light railway transit are presented. We finally come to the conclusion that HR Plates can be apply to narrow steel box girder in the light railway transit.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.86-92
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• 2008

AGT system is a kind of light railway train. AGT system use of concrete track and rubber tire, so it can be reduce the noise and vibration, compare to the normal train system. And, the dynamic responses of normal bridge are influenced by the dynamic characteristics of bridge, the speed of vehicle and the surface roughness of railway. But the AGT system bridge is influenced not only the above facts but also the guiderail unevenness, because, AGT vehicle steered by guiderail. So, in this study, optimized service condition is suggested for the design and operation of AGT system, by the means of experimental study. The experiments are executed for PSC bridge with length of 30m, at the AGT test line in Kyongsan. The test results are compared and investigated according to the prominence. In the test result, the guiderail prominence influenced on the dynamic response of bridge. It shows a increase as compared with no guiderail prominence in the dynamic response value acceleration, displacement, stain.

• 한국철도학회논문집
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• 제10권1호
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• pp.22-28
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• 2007

During the passage of the train, the railway bridge undergoes vibration and noise. The noise of railway bridge can be occurred from various sources. The wheel-rail contact, noise from machinery parts, structural-borne noise, pantagraph noise and aerodynamic noise of the train work in combination. Running train is one of the most important factors for railway bridge vibration. The repeated forces with equidistant axles cause the magnification of dynamic responses which relates with maintenance of the track structure and structure-borne noises. The noise problem is one of the most important issues in services of light rail transit system which usually passes through towns. In the present study, The vibration and noise of the LRT bridge will be investigated with utilizing dynamics responses from moving train as input data for noise analysis.

• 한국농촌건축학회논문집
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• 제10권1호
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• pp.67-74
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• 2008

Recently, construction of bridges in rural areas has been increased to preserve the natural environment. However this brings forth the disputes over rights of light in farmland. In urban areas, the disputes over rights of light have been settled on the authority of the national architectural law and only sunshine hours for winter solstice are considered. Basically, the point at issue is different between each case. The main issues of the dispute in rural area were the reduction of the crop cultivation and the increase of the heating cost in winter. The purpose of this study is to review the mediation process in national environmental dispute resolution commission to resolve these issues, and to set up the analysis method of rights of light and modelling equation of solar position. Furthermore, we aimed at analyzing the damaged hours of daylights in rural housing and the infringement rate of daylight in farmland through the case study. In conclusion, we estimated the sunshine hours during the whole damaged periods according to the elements of bridges, and presented the solution process of dispute over rights of light due to the construction of bridge in rural area.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.395-400
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• 2007

LRT(Light Railway Train), which is a intermediate system of train and bus, is arose for the solution of subway construction cost and the transportation capacity of bus. LRT was introduced in 1980's. About 30 local governments are plan to introduce LRT or constructing LRT, at present. AGT(Automated Guide-way Transit) system, which is a kind of LRT, is operated without driver. Rubber wheeled AGT system can reduce the noise and vibration compare to steel wheeled AGT, so it is estimated as ideal transportation system for urban area. And live loads at bridge are classified as the static load of vehicle and the dynamic wheel contact load which is occurred from the interaction of bridge and vehicle vibration, and the surface roughness. In the case of AGT system, the dynamic increment factor of bridge is greater than the normal train bridge and roadway bridge, because, the weight of AGT vehicle is more light that the train of truck. The exact method for dynamic increment factor is experiment. But this method is needed much money and time, moreover, this method cannot be adopted in design. Therefore, a simulation program for the interaction of AGT bridge, vehicle and surface roughness was developed, in this study. And the program was verified by experiment. As a result, the accuracy of the simulation program can be verified.

• 한국철도학회논문집
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• 제10권5호
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• pp.554-562
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• 2007

22mm까지의 두께를 갖는 HR Plate의 사용량을 증대시키기 위해서는 HR Plate가 강교량의 주부재를 포함한 모든 부재에 적용되는 것이 요망되어진다. 본 연구에서는 HR Plate의 적용가능 폭을 갖는 경량전철 협폭 박스거더의 가능성을 검토하였다. 빔요소와 플레이트 요소를 적용한 15개 경량전철 교량 모델들에 대해 풀모델링과 서부모델링을 적용하여 전산 구조해석을 수행하였다. 해석결과 HR Plates의 협폭박스거더는 경량전철에 적용될 수 있다는 것을 확인하였다.