• Journal of the Korean Professional Engineers Association
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• v.37 no.2
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• pp.42-46
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• 2004

고속철도 건설의 필요성 서울-부산간 교통난 심화, 경부축; 인구 71%, GDP 75% 집중, 과중한 물류비용으로 국가경쟁력 악화 (GDP 대비: 일본 -9.5%, 미국 -9.9%, 한국 -16.3%), 새로운 교통시설 확충에 대한 국민적 요구 증대, 건설비는 고속도로에 비해 1.5배가 증가하나 수송력 2배, 운행시간 2-3시간 단축 효과, 우리나라는 수송밀도가 매우 높아 수송문제를 해결하기 위해서는 속도향상이 필수적임(속도=수송력 증가), 고속철도 ; 여객전용, 기존선 철도 ; 화물중심으로 운행(중략)

• Journal of The Korean Society For Urban Railway
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• v.6 no.4
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• pp.383-392
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• 2018

This study investigated the change of additional axial stress of rail and reaction force at bridge bearings due to the track-bridge interaction when laying CWR on non-ballasted railway bridges including truss bridges with relatively long span. According to the results of the present study, additional axial stresses of rail and reaction forces at bridge bearings showed a large increase when CWR is installed on the non-ballasted railway bridge. The additional axial stress of rail can be acceptable if sufficient lateral resistance can be obtained. However, if the reaction force increases, there is a risk of damage of the bearing or pier, and therefore, it is necessary to take measures to mitigate the reaction force. It is found that additional axial stress of rail decreases when considering the frictional resistance of the bridge movable support, but its effect on the bearing reaction force is very small. On the other hand, when the longitudinal track restraint decreases, both additional axial stress of rail and bearing reaction force are reduced to a large extent. Also, when the ZLR fastening devices are applied to the region where the additional axial stress of rail is highest, bearing reaction force as well as additional axial stress of rail greatly decreased. Therefore, the application of ZLR fastening devices with the reduction of the longitudinal track restraints is very effective for installing CWR on non-ballasted railway bridges.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.11a
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• pp.9-10
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• 2019

서울시 첫 번째 경전철인 우이신설선은 2017년 9월 개통 이후 대중교통 불모지인 서울 동북부지역의 중요한 교통축을 담당하고 있다. 일평균 약 8만 명이 이용하는 우이신설선은 통행시간의 획기적인 개선과 지역 활성화에 기여하는 등 긍정적 효과가 있으나 개통 2주년이 지난 현재 출퇴근시 혼잡도 문제가 심화되는 등 대시민 서비스 측면에서의 쟁점도 제기되고 있다. 본 논문은 우이신설선 사례를 기반으로 서울시 경량전철 통행특성을 분석하고 첨두시 혼잡원인을 파악하여 계획단계부터 혼잡도를 고려한 시설설계 개선방안 등을 제시하였다. 통행특성 및 혼잡원인 분석은 우이신설선을 통과하는 개별 카드데이터를 활용하였으며, 더 나아가 카드데이터의 특성을 고려한 열차 내 혼잡도 산정 알고리즘을 연구·개발하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.300-302
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• 2014

해상교통관제(VTS, Vessel Traffic Service)는 초창기 정보 전달 역할에서 최근에 선박의사결정지원과 정보통신기술이 결합된 e-Navigation의 중심축으로 그 역할이 확대 되고 있다. 관제 구역은 선박이 항해하는 항로, 정박지, 준설구역, 급유작업, 수상레져 활동, 낚시등 다양한 해양 활동이 동시에 이뤄지고 있다. 따라서 발전하는 관제센터의 역할에 발맞춰 관제 구역에도 해양공간계획(MSP, Marine Spatial Planning) 개념을 도입하여 구역에 대한 관리를 강화해 나갈 필요가 있다. 본 연구에서는 해양공간계획을 도입한 선행 연구 사례를 검토하고 이를 우리나라 해상교통관제에 적용하기 위한 제안을 하고자 한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.17 no.2
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• pp.152-167
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• 2018

The high-speed weigh-in-motion system can collect the traveling speed and load information of individual vehicles, which can be used in a variety of ways for the traffic surveillance. However, it has a limit to apply the high-speed weigh-in-motion data directly to a safety analysis because high-speed weigh-in-motion's raw data are point measured data. In order to overcome this problem, this paper proposes a method to calculate the conflict rate and the Impulse severity based on surrogate safety measures derived from the detection time, detection speed, vehicle length, vehicle type, vehicle weight. It will be possible to analyze and evaluate the risk of rear-end collision on freeway traffic. In addition, this study is expected to be used as a fundamental for identifying crash risks and developing policies to enhance traffic safety on freeways.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.2
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• pp.36-47
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• 2020

The objective of this study is to analyze the effect of the shoulder-use lane, which is a representative traffic management technique that increases the road capacity. The operation of the shoulder-use lane has been actively used as a countermeasure to improve traffic congestion, because it has the effect of improving traffic flow during rush hour. In Korea, the shoulder-use lanes are available at Gyeongbu, Yeongdong, and on the Seoul Outer Ring expressway, and their use is gradually increasing. Therefore, a comprehensive analysis was conducted to analyze the effects of the shoulder-use lane; including 1) analysis of individual shoulder lanes based on a time space diagram, and 2) analysis of shoulder lanes by road axis. These findings can contribute to the efficient installation and operation of shoulder-use lanes on expressways.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.7
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• pp.4580-4587
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• 2014

This study provides an improved transportation mode choice models applicable to the Busan-Ulsan Metropolitan area by scrutinizing previous study results developed using the multinomial logit model. Although the previous model has an appropriate modeling structure in terms of the sign of coefficient estimates and goodness-of-fit, the model ignores the total number of trips and traffic congestion condition between the two zones and partially reflects zone-specific variables and choice set. Therefore, this study considered all of these modeling faults by re-constructing the representative utility functions. The modeling results show that travelers in Busan-Ulsan metropolitan area tend to choose their mode using mode-specific characteristics rather than the classical travel time and/or cost variables.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.1 no.1
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• pp.33-40
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• 2002

This paper presents the evaluation result of the Namsan 1st tunnel traffic information system, which is providing the real time queue length status and incidence information inside of the Namsan 1st tunnel, 1600meters long in the Seoul metropolitan CBD. This information system plays an important role because of notifying drivers to pay a toll for the tunnel path, the congestion information in advance. According to the analysis, an evident improvement on the tunnel path and its bypass without any conspicious adverse impact. Furthermore, survey analysis found that motorists placed a high value on the provided information. During peak time, the system turned out to help motorists to relax their hasty minds. As well, several performance indices showed the reduction of congestion and travel time variation on both of the tunnel path and its bypass, in spite of no traffic information on the bypass.

• Proceedings of the KSR Conference
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• 1998.05a
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• pp.39-72
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• 1998

우리나라의 경제·사회적으로 70%이상이 집중되어 있는 서울-부산축의 물류난을 해소하고 지역 간 교통체계를 획기적으로 개선하기 위하여 경부고속철도사업이 추진되고 있다. 동 사업은 '92년 착공된 이래 7년이 지난 지금까지 17.8%의 공정을 추진하면서 어느 사업보다도 신문지상에 많이 오르내리는 사업이 되어 버렸다. 동 사업은 사업이 필요했던 당위성보다는 그간에 나타난 문제점으로 인하여 국민에게 문제가 많은 사업으로 여겨졌다.(중략)

• The Journal of the Korea Contents Association
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• v.14 no.3
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• pp.451-462
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• 2014

In this paper, Coordinated Semi-Actuated Signal Control algorithm was developed and evaluated. According to the analysis of simulation, the coordinated semi-actuated signal control led to reduced vehicle delay as the difference of traffic volume between major and minor streets was getting bigger. But when there was relatively high traffic volume, or the equivalent amount of traffic volume on major and minor streets, optimized pre-timed signal control was verified to lower delay times compared to coordinated semi-actuated signal control; however, it might increase pedestrian delay. Therefore, the coordinated semi-actuated signal control should be implemented at intersections where traffic volume is relatively low.