• 시스템엔지니어링학술지
• /
• 제7권2호
• /
• pp.13-19
• /
• 2011

A LRT(Light Rail Transit) is one of the Future Urban Railway Development Project. The project's goal is to reduce a transportation congestion in the center of the city. New transportation is intensely required in order to overcome a limit of the ground transportation that is the existing public transportation, A LRT(Light Rail Transit) construction project to be based on an unmanned driving system is the large composition system that a vehicle, a signal, communication, electric, track etc. were organically integrated as echo-friendly urban transportation systems. It also put a huge budget, which is a large-scale infrastructure projects. It is international trend that Light Rail Transit projects apply a technique in System Engineering for a schedule, cost, quality elevations, and to approach in viewpoints of life-cycle from initial construction steps to operation, abolition. This paper intends to analyze RAM requirements taking into consideration ISO/IEC 15288 throughout life-cycle from concept, design, manufacture, operation and maintenance to the final phase, decommissioning, and the study seeks to suggest directions of efficient use to domestic LRT projects.

• 한국건축시공학회지
• /
• 제12권6호
• /
• pp.596-606
• /
• 2012

In recent years, LEED-NC (Leadership in Energy and Environmental Design for New Construction) has become one of the most widely adopted environmental certification systems in the United States. However, according to some researchers, the adoption of the LEED-NC is perceived to add to construction cost and duration compared to conventional building standards. Therefore, it is necessary to examine the economic benefits of LEED-NC to consider how it can be applied worldwide. This study focuses on the impact of LEED-NC on the appraised unit value of parcels in San Francisco County based on the number of LEED-NC Public Transportation Access (PTA) qualified buses, light rail and commuter rail stops, distance to the closest bus, light rail and commuter rail stops, zoning class and parcel size. As a population of interest, San Francisco County was chosen since it is known as a region with well-organized transportation systems including bus, light rail and commuter rail systems. According to the correlation results, this study shows that the appraised land value is significantly affected by LEED-NC PTA, and is correlated to a higher appraised unit value of land parcels.

• 대한교통학회지
• /
• 제14권1호
• /
• pp.165-177
• /
• 1996

Recently, many local governments suffering from traffic congestion have plans to introduce light weight (mid-size) rail transit systems, since the systems' investment costs are known to be much less than heavy rail transits such as the subway in Seoul. Most of the governments expect private partners to be involved in the systems' constructions and operations mainly because of their financial difficulties. Since the governments do not have experiences of evaluating and selecting privately financed transportation systems, they may need an evaluation guideline. This paper discusses evaluation criteria, methodologies, and procedures which will be helpful to local governments faced with evaluating light weight rail transit systems proposed by private companies.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2000년도 추계학술대회 논문집
• /
• pp.101-108
• /
• 2000

Tins paper is designed (ⅰ) to envisage the characteristics of high speed rail stations that will be in operation when the Seoul-Pusan line currently under construction is completed and (ⅱ) to assist policy makers in mapping out transportation strategies by providing insights into how advanced countries have handled problems under similar circumstances. Ultimately, tins paper intends to present alternatives of trans-modal systems in an attempt to set a direction for future policy making in the high speed rail sector. The alternatives recommended in tins report stress two important elements for maximized utility of high speed rail: One is to maintain consistency in transportation policies and the other is to attract consumers to the station areas.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2007년도 추계학술대회 논문집
• /
• pp.1883-1895
• /
• 2007

With a land area of 910,768 sq. km, population estimate of 150 million people and GDP-growth rate of 6.9% per annum (2006 est), the centrality of effective public transportation in Nigeria is readily seen. In this regard, rail transportation offers much potential because of its relative safety, reliability, lower cost to the users and being singularly capable of transforming the national economy through mass movement of people, goods and services. Within this context, the demand for an effective railway system, and the enormous potentials for profitable investment in rail infrastructure in Nigeria, is indisputable. Beginning with the history, the paper discusses the main problems of Nigeria's railway transport system; and then makes policy suggestions, after considering the potentials of rebuilding the rail infrastructure. The necessity of this work is premised on the fact that there is a significant gap in critical knowledge about Nigeria's railway transport system.

• 한국도시철도학회논문집
• /
• 제6권4호
• /
• pp.339-350
• /
• 2018

도시철도에서 지하 터널의 미세먼지는 여러 가지 요인에 의하여 발생하고 있다. 도시철도 미세먼지 발생량을 예측하기 위하여 여러 가지 발생요인 중 레일 마모량 분석에 관한 연구를 수행하였다. S호선 구간(약 45km)에서 1년 6개월 간 레일마모측정장치에서 측정된 레일 마모 데이터를 곡선반경(R)의 변화에 따라 약 170개 구간으로 구분하였으며, 레일 마모 측정값 중에서 직마모량(C0)와 편마모(V0)량을 이용하여 곡선반경에 따른 레일 마모량 관계를 분석하고, 직선구간과 곡선구간에서 각각 구간평균 편 직마모량과 노선평균 편 직마모량을 산출하였다. 레일 마모량과 레일 단면적의 상관관계를 분석하여 단면적에 대한 근사식을 구하고, 레일 C0와 V0의 변화량을 이용하여 레일 마모에 의한 미세먼지 발생량을 산정하였다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2007년도 추계학술대회 논문집
• /
• pp.1647-1656
• /
• 2007

고속철도 서비스 수혜지역의 확대 요구에도 불구하고, 현재 국가 철도망 관련 상위계획 상에서 제시된 장래 국가 철도망은 수송애로구간 및 수송수요 분석에 의한 개략적인 노선계획이라 할 수 있으며, 합리적이고 장기적인 국가 고속철도망 구축방향은 마련되어 있지 않은 상황이다. 더욱이 기존 철도망의 투자우선순위 평가항목은 경제적 타당성 및 수송수요 규모 등으로 대표되는 투자 효율성, 기존 철도망과 연계될 수 있는 네트워크 연결성, 정책적 타당성으로 획일화 되어 있으며, 이중 대부분의 철도망 계획에 가장 큰 영향을 미치는 항목은 B/C 비율로 대표되는 투자 효율성 측면이라 할 수 있다. 이에 본 연구는 우리나라의 중장기적 고속철도망 계획과 투자우선순위를 전통적인 평가기법에서 벗어나 지속가능한 교통(sustainable transportation)의 관점에서 이를 분석할 수 있는 방법론을 제안하는데 그 목적이 있다. 본 연구는 먼저 지속가능한 교통에 대한 정의를 내리고, 이를 측정할 수 있는 지속가능한 교통 지표를 교통 효과성 지표, 환경지표, 경제지표 및 사회지표로 제시한 다음 지속가능한 고속철도망 평가를 위한 목표와 성과 척도를 선정하였다. 그리고 지속가능한 교통의 관점에서 우리나라 고속철도망의 계획과 투자우선순위를 분석할 수 있는 다원-속성 효용이론(multi-attribute utility theory)을 이용한 다원-기준 의사결정방법론을 제안하였다.

• Structural Engineering and Mechanics
• /
• 제52권5호
• /
• pp.1019-1032
• /
• 2014

Rails are key elements in railway superstructure since these elements receive directly the train load transmitted by the wheels. Simultaneously, rails must provide effective stress transference to the rest of the track elements. This track element often deteriorates as a consequence of the vehicle passing or manufacturing imperfections that cause in rail several defects. Among these rail defects, transverse cracks highlights and are considered a severe pathology because they can suddenly trigger the rail failure. This study is focused on UIC-60 rails with transverse cracks. A 3-D FEM model is developed in ANSYS for the flawless rail in which conditions simulating the crack presence are implemented. To account for the inertia loss of the rail as a consequence of the cracking, a reduction of the bending stiffness of the rail is considered. The numerical models have been calibrated using the first four bending vibration modes in terms of frequencies. These vibration frequencies have been obtained using the Experimental Modal Analysis technique, studying the changes in the modal parameters of the rails induced by the crack and comparing the results obtained by the model with experimental results. Finally, the calibrated and validated models for the single rail have been implemented in a complete railway ballasted track FEM model in order to study the static influence of the cracks on the rail deflection caused by a load passing.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
• /
• pp.465-471
• /
• 2011

In order to make an feasibility analysis of such as rail and road transportation infrastructure, it is common to perform economic analysis. one of the most important thing is how to estimate the operation cost of freight rail because that is required during the analysis time period and sometimes that takes more cost than the construction cost. Therefore, this study is to perform the verification of freight rail operation cost which is applied to the economic analysis of railway investment analysis. for this, it is compared truck operation cost variation with freight rail operation cost, when freight volume is converted from road to railway. In conclusion the cost variation of railway part is bigger than road part so it is necessary to improve the operation cost of freight rail estimation process.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2010년도 춘계학술대회 논문집
• /
• pp.1958-1963
• /
• 2010

Space Elevator introduced in the science fiction titled "The Fountatins of Paradise" by Arthur C. Clarke in 1979 could be attainable for the transportation of human and distribution from earth to space. Space Elevator could reduce shipping expenses and risks of the transportation system. Developing Space Elevator has to need rail technologies for the train and the rail using Carbon nanotube cable, installation of rail appropriated for Earth-orbiting. For this reason, rail technologies for developing Space Elevator will be suggested by this study through the case study.