• 대한토목학회논문집
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• 제26권1D호
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• pp.41-47
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• 2006

교통시설 건설사업을 기획하고 평가하는 단계에서 형평성 및 효율성에 많은 논란이 제기되고 있는 사업들이 존재하고 있다. 그 이유 중의 하나는, 사업의 타당성을 평가함에 있어서 소요되는 비용은 명백히 드러나지만 사업실시에 따른 편익항목의 종류와 기준은 애매모호한 부분이 존재하기 때문이다. 이에 본 연구에서는 편익항목을 설정하는 기준을 명확히 하기 위하여 우선적으로, 부산광역시의 도로 및 도시철도의 시설이용자에 대한 만족도 평가와 함께 교통시설에 있어 기존의 경제성 분석방법으로 평가를 실시하였다. 그 결과 이용자들은 도시철도 이용에 대한 만족감이 도로이용보다는 높게 나타났으나 경제성 분석 방법인 B/C분석을 행한 결과, 도시철도시설이 대상도로에 비해 경제적 타당성이 상당히 낮은 것으로 나타났다. 이와 같은 모순적인 사실은 현재 부산광역시의 인구에 대비한 지하철 수단분담율에 비춰볼 때 편익항목에 대한 설정 기준이 맞지 않아 편익의 값이 다소 적게 산출된 결과라고 판단할 수 있다. 따라서 본 연구에서는 교통시설 건설타당성 평가를 실시할 경우에 고려되어야 할 편익항목들을 열거하고 ANP기법을 통하여 각각의 항목에 대한 가중치를 산정하였다. 그 결과 접근성, 정시성, 주행시간 순으로 높은 가중치를 가지고 있었으며, 기존의 경제성 분석시 고려되는 편익항목보다는 주민의 교통여건향상에 따른 편익항목이 더욱 높은 중요도를 가지고 있는 것을 알 수 있었다.

• 한국터널지하공간학회 논문집
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• 제8권4호
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• pp.365-375
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• 2006

일반적으로 터널2차라이닝의 구조해석에는 골조해석모델이 적용되고 있다. 본 모델은 경험적 방법에 의한 지반 이완하중을 고려하고 있으나 주관적이고 과대평가되는 경향이 있다. 2차라이닝에 작용하는 지반하중은 숏크리트 및 록볼트와 같은1차지보재의 지지력 상실에 기인한다. 그러므로 2차라이닝에 작용하는 지반하중 산정에는 1차지보재와 지반의 평형상태가 고려되어야 한다. 지반-라이닝 상호작용(Ground-Lining Interaction, GLI)모델은1차지보재의 지지력 상실에 의해 야기된 지반의 변형을2차라이닝이 지지하는 개념을 토대로 수립되었다. 따라서 GLI모델은 복잡한 지반조건과 1차 지보재의 설치조건을 합리적으로 반영한 지반하중을 고려할 수 있다. 2차라이닝에 작용하는 하중은 지반하중 외에 지하수압, 지진하중 등이 있다. 극한강도 설계법을 이용한 라이닝 구조보강을 위해서는 계수하중 및 다양한 하중조합이 고려되어야 한다. GLI모델은 계수하중을 고려하기 곤란하기 때문에 개별 하중에 대해 산정된2차라이닝 단면력에 하중계수를 곱하는 중첩의 원리를 적용하였다. 끝으로, 본 연구에서 제시된 GLI모델을 이용한 2차라이닝 설계방법을 저심도 지하철 터널에 적용하였다.

• 전기학회논문지
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• 제63권7호
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• pp.1013-1018
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• 2014

This paper described the development of equalizing spacer for minimization of voltage drop according to DC feeder extension. Power consumption is increased as shorter interval of train driving time and transportation capacity increase in urban subway. Therefore we investigated voltage drop of catenary at a point in case of traction driving of a train in parallel to the DC power supply system. Based on it's result, equalizing spacer is designed and fabrication to minimize the voltage drop in accordance with the power supply line arranged in three rows, and then its performance was confirmed that the stress distribution of main body and the distributed load are satisfied through the body structure modeling.

• 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.

• Geomechanics and Engineering
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• 제34권1호
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• pp.17-27
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• 2023

Taking a subway shield tunnel in a certain section of Zhengzhou Metro Line 5 as an example, the field tests of shield cutting cement-soil monopile composite foundation were carried out. The load and internal force of the tunnel lining under the action of composite foundation were tested on-site and the distribution characteristics and variation laws of earth pressure around the tunnel under the load holding state of the composite foundation were analyzed. Five different load combinations (i.e., overburden load theory + q₀, Terzaghi's theory + q₀, Bierbaumer's theory + q₀, Xie's theory + q₀, and the proposed method (the combination of compound weight method and Terzaghi's theory) + q₀) were used to calculate the internal force of the tunnel structure and the obtained results were compared with the measured internal force results. The action mode of earth pressure on the tunnel lining structure was evaluated. Research results show that the earth pressure obtained by the calculation method proposed in this paper was more consistent with the measured value and the deviation between the two was within 5%. The distribution of the calculated internal force of the tunnel structure was more in line with the distribution law of field test data and the deviation between the calculated and measured values was small. This effectively verified the rationality and applicability of the proposed calculation method. Research results provided references for the design and evaluation of shield tunnels under the action of composite foundations.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2348-2356
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• 2011

In recent years, many researches for DC power distributed system (PDS) are being preformed and the importance of the DC PDS is more and more emphasized. Furthermore, in the railway system, the DC PDS is used in subway station lighting, facilities, etc. In the DC PDS, DC bus voltage instability may be occurred by the operation of multiple parallel loads such as pulsed power load, motor drive system, and constant power loads. Thus, good quality and high reliability for electric power are required and voltage bus conditioner (VBC) may be used the DC PDS. The VBC is a DC/DC converter for mitigation of the bus transients. In this paper, adaptive controller is designed. The simulation results by PSIM are presented for validating the proposed control algorithm.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.163-168
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• 2005

In case of rolling stock, SEMS is generally applied in the advanced countries, but is start stage in our country. SEMS is defined the system engineering management system in order to achieve the optimized train performance among the several client requirements aspect of technical engineering management during the design life cycle. And the fire engineering activities in hong kong EMU project are introduced aspect of SEMS in this paper. The fire engineering at rolling stock in view of SEMS controls to apply the satisfied interior material by the fire safety standards (regulation of the commute urban subway safety guideline by the MOCT, BS 6853, NFPA 130, NF F 16-101) and to minimize the fire load in order that passengers egress safe from the fired rolling stock. The rolling stock in the advanced countries is designed to stand for 15-20 minutes in considering the rolling stock to be fired in tunnel. For passenger fire safety, the passenger evacuation provision and progress is set up.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1132-1137
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• 2010

There are execute of new laws about prevent of earthquake diaster in nation because of some increments of big earthquake occurence frequency. Now develope new composit plate by ductile fiber with strong mechanic materials, which compose of strengthening systems for the underground structures subject to forced displacements. This study is to focus to develop the retrofitting system for the cut and cuver tunnels built without earthquake type load scenario, so that it can provide the safety of existing urban subway system against earthquakes.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.425-430
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• 1998

This paper presents a high performance low switching PWM technique for the propulsion system of railway such as subway and high speed train. In order to achieve the continuous voltage control to six-step and a low harmonics with low switching frequency under 500Hz, the synchronous PWM technique is combined with a space vector overmodulation and implemented by using DSP. Improved performance and a validation of proposed method are showed by the digital simulation and the experimental results using a 1.65MVA IGBT VVVF inverter and inertia load equivalent to 160 tons railway vehicles.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.1
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• pp.502-505
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• 2003

The accidnet of breaking insulator rod leads to inturruption of moving the subway. We investigate the analysis of analysis of breaking accident of FRP insulator rod installed in dead section for catenary feeding system. To analysis of accident reason, SEM is used to analysis microscopic struture on surface of cross section of broken FRP insulator rod. At the same time, we examine the chage of atomic amount on solace of accident insulator through EDX analysis. Also, the test for tensional breaking load is condoled to check the mechanical strength.