• International Journal of Railway
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• 제1권3호
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• pp.99-105
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• 2008

Flow around an ICE2 high-speed train exiting a tunnel under the influence of a wind gust has been studied using numerical technique called detached eddy simulation. A wind gust boundary condition was derived to approximate previous experimental observations. The body of the train includes most important details including bogies, plugs, inter-car gaps and rotating wheels on the rail. The maximal yawing and rolling moments which possibly can cause a derailment or overturning were found to occur when approximately one third and one half of the train, respectively, has left the tunnel. These are explained by development of a strong vortex trailing along the upper leeward edge of the train. All aerodynamic forces and moments were monitored during the simulation and the underlying flow structures and mechanisms are explained.

• 유통과학연구
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• 제4권1호
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• pp.53-78
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• 2006

우리는 이 세상을 네트워크사회라 한다. 로지스틱스는 사람과 물자와 정보를 연결하는 중요한 시스템의 하나다. 21세기 세계경제여건은 빠르게 변화하고 있다. 이런 변화는 여타지역 보다 동북아시아에서 더 현저하다. 중국·북한 러시아는 경제, 사회시스템을 변화시켰으며, 이는 아시아와 유럽간의 교역과 물량수요의 확대시켰다. TSR, TCR, TMR, TMGR, TKR과 같이 유라시아 대륙을 횡단하는 철도시스템은 국제 운송의 효율을 향상시키고 국제철도로 대륙을 연결하는 데 매우 중요하다. 본 논문은 한반도를 둘러싼 물류환경을 조사 분석하였다. TSR, TCR(TMR, TMGR), TKR과 같은 대륙횡단철도와 관련하여 고려되고 해결되어야 할 운영여건과 과제를 조사하였다. 특히 중국, 러시아 북한의 물류현황과 문제점들을 조사하였다. 그리고 이들 철도들의 SWOT분석을 실시하고 비교하였다. 이 대륙간 철도들이 여러나라를 효과적으로 연결하고 합리적으로 운영하는 것과 관련하여 비전과 목표들을 제시하였다. 마땅히 고려되어야 할 정책과 전략/전술뿐만 아니라 당연히 채태되고 도입되어야 한다고 판단되는 많은 세부 대안들이 제시 되었다.

• 한국철도학회논문집
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• 제11권6호
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• pp.550-561
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• 2008

본 연구에서는 도시권역의 대중교통수단과는 여러 가지 측면에서 차별화 되는 지역 간 철도의 특징을 반영한 대중교통 통행배정모형을 제시하였다. 경로구간 기반으로 대중교통 네트워크를 확장하고, 경로구간을 운행하는 노선의 선택확률을 통행배정모형 내에서 결정하는 것이 아닌 외부적으로 결정하는 방식을 적용하여, 직접 네트워크를 확장하는 방법보다 네트워크 확장 규모를 줄일 수 있었다. 지역간 철도의 특징을 반영할 수 있도록 적정한 가정을 통해서 경로구간 기반의 결정적 대중교통 통행배정모형과 해법을 제시하였다. 현실을 최대한 반영한 소규모 네트워크에서 기존의 대표적인 대중교통 통행배정모형과 비교한 결과 본 연구에서 제시한 모형의 예측력이 우수한 것으로 분석되었다.

• 한국측량학회지
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• 제39권5호
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• pp.321-328
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• 2021

This study considered measures to support the establishment of surveying and spatial information in preparation for the unification of South and North Korea and the subsequent construction of national infrastructure. The organization identified and analyzed spatial information about North Korea, road and railway-oriented SOC construction projects, and examined the applicability of the latest technologies to narrow the technical gap with North Korea and quickly establish land spatial information. To prepare a support process appropriate for the situation in North Korea, technical and human support details and considerations were reviewed through a case analysis of spatial information construction for developing countries. In addition, the main result was "Presenting Efficient Utilization of Human Resources and Equipment for the Establishment of Spatial Information in North Korea," establishing an efficient utilization plan for the human resources and equipment needed in the support process based on technology support. It is expected that the South Korean government will minimize the negative impact on future land infrastructure construction by first conducting research in inter-Korean economic cooperation and national infrastructure construction and establishment of spatial information construction plans.

• 대한기계학회논문집A
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• 제35권1호
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• pp.91-98
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• 2011

측풍 시 AREX 열차에 가해지는 공기역학적 하중을 측정하기 위하여 풍동시험이 수행되었다. 5% 축소 시험 모델은 연결부, 하부 및 대차부 등을 포함하여 가능한한 자세하게 모델링되었다. 시험에 사용된 풍동은 폭 4m $\times$ 높이 3m 의 시험부를 가진 한국항공우주연구원(KARI)의 중형 아음속 풍동이다. 두 종류의 선로 모형에 놓여진 열차 모델에 가해지는 공기역학적 하중과 모멘트는 요각에 따라 도시되었으며, 실험 조건에 따른 공력 계수의 특성이 분석되었다.

• 한국철도학회논문집
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• 제15권3호
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• pp.231-236
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• 2012

본 논문에서는 고속철도의 주행 시 발생하는 공력소음에 대한 특성을 도출하는 연구를 수행하였다. 우선, 마이크로폰 어레이 시스템을 이용하여 고속철도 차량의 주행 소음을 측정을 통해서, 주요 공력소음원이 고속철도 차량의 전두부, 팬토그래프, 차간 부위임을 확인하였다. 또한 측정한 데이터를 바탕으로 빔형성 방법을 이용하여 빔출력을 구하였으며, 푸리에 변환을 통해서 주파수 영역에서의 빔파워 스펙트럼을 도출하였다. 본 연구를 통해서 고속철도의 주요 공력 소음원인 전두부, 팬토그래프, 차간 부위에 대한 음압 특성이 빔형성 방법을 이용하여 도출되었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.707-710
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• 2011

System safety is defined as the state where the hazard risks due to internal system, interface, operation and maintenance are controlled as acceptable levels. It is represented and evaluated either with the risk level of each risk factor with the consideration of operation environments or with Safety Integrity Level (SIL) which is the system functional safety without considering application environments. The assessment results are issued in forms of certificates and they are reused in many cases. However, the conditions and restrictions for different application environments vary in each case, therefore, additional evaluation on the preconditions of assessment in comparison with the actual application environment must be carried out. For the area of train control, TR 50506-1 has been established based on the IEC 62425 (international standard for safety of train control system by RSSB) and EN 50129 (Europe standard) for the further assessment. In this paper, the analysis on TR 5056-1 has been conducted in depth. The purpose of the study is to determine the requirements for inter-acceptability including scope, procedures, principles, examination and suitability. The results can be utilized for the system safety maintenance when new devices or components are introduced in conventional systems.

• 한국항만학회지
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• 제7권1호
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• pp.43-58
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• 1993

There has been fast progress in economy in Korea derived by a consecutive five-year plan program for economic development started in the early 1960's. In the field of transportation, rapid changes in the technological environment of transportation and communication have brought a revolution of the transport system, of which inter-modal transportation through containerisation is typical. Because of the rapidly growing traffic volumes of cargo, especially container traffic, and lack of investment into transport infrastructure in the past, both road and railway are beyond their capacity. As a result, the public-road network has suffered a serious congestion problem. For instance, in relation to the corridor between Seoul and Pusan, today, it takes about 14 hours for the journey of container trailer through Kyongbu Expressway, for which it used to take only 7 hours in 1986. For the railway, though the congestion problem is not very serious compared with the road sector, a shortage of capacity on certain main lines has emerged as a problem as railway traffic has increased. Furthermore, the further expansion of the system in near future is difficult due to burden of higher construction the cost. Unlike these two modes, coastal shipping, which has been paid relatively less attention for commodity transport in Korea, shows no constraint in this respect. In addition, it is the most cost efficient mode of transport. This work therefore aims to make a proposal for the alternative inland transportation mode, which is to promote the coastal transport of container. Three obstructing factors for the promotion of the coastal transport are investigated and some solutions for those are suggested as follows : First, it appears to be essential to provide exclusive ports for the coastal shipping, that comply with simplification, specialization and rationalization. The optimum size of berths on the exclusive ports in Pusan port is estimated as 16-20. We found that it needs periodical study and publicity on the advantages from the adoption of the coastal mode. Inducing competition in the coastal shipping market is also necessary. For the supply of the fleet in the coastal shipping, chartering of the surplus ships in the oversea shipping is found to be more desirable than new shipbuilding. Second, to solve the fragmentation of the companies which wish to participate in the coastal transport, government has to implement the subsidy policy. The encouragement of participation of the shipping lines engaging in Korea-Japan run and Korea-East South Asia run, into coastal shipping also needs to be considered cautiously. Third, simplification of the document for entry in ports is needed for rational coastal shipping management. We can use B/L (Bill of Lading) for coastal shipping as a prerequisite to get the indemnity by P & I Club. The reduction of the government controls on entering and leaving the ports also needs.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.657-665
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• 2008

The main transportation mode of long distance inter-city passenger trips is high-speed rail and the modal share of transportation has been changed profoundly since the KTX service has been started in the Kyung-Bu railroad transportation corridor in the day of 1 April, 2004. After an opening of KTX service in the second stage Kyung-Bu and Ho-Nam railroad transportation corridors, a capacity of incumbent railroads will be increased and operational environments of freight train will be improved. The purpose of this paper is to examine the impact of KTX service operation on the national logistics thoroughly. This paper establishes a deceptive scheme in the national railroad logistic transportation and a route operational strategy between the main origins and destinations efficiently considering the changes of the current freight transportation system in the future. We expect to achieve efficiency of logistic transportation in this paper through alternative routes for example Ho-Nam, Chang-Hang, Seo-Hae line.

• 한국철도학회논문집
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• 제19권1호
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• pp.87-96
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• 2016

통행자 수단선택 연구에는 확률 효용 최대화 원칙(RUM)에 입각한 다항로짓모형이 주로 사용되어졌다. 그러나 최근 들어 RUM 원칙을 대신할 대안적 방법론의 제시가 이루어지고 있으며, 이러한 대안적 방법의 하나로 제시된 것이 확률적 후회 이론모형(RRM)이다. 본 연구는 지역간 통행자의 수단선택 행태를 모사함에 있어 RRM 모형을 적용하고, RUM 원칙을 적용한 다항로짓모형의 구축결과와 비교를 통하여 RRM 모형의 적용가능성을 검토하였다. 분석결과, RUM 모형과 RRM 모형 모두 모수 추정결과는 직관과 부합하는 결과를 보였으며, 모형의 자료 적합도는 RUM 모형보다 RRM 모형이 조금 더 높게 도출되었다. 결론적으로 자료적합성 측면에서 RRM 모형이 RUM 모형보다 낫다고 판단할 수 있으나, 아직 일부 사례에만 검토되어졌기 때문에 추후 경로선택, 화물 운송수단 선택 등 더 많은 통행자의 선택상황에 대한 추가적인 검토가 필요하다고 하겠다.