• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.343-345
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• 2012

기존의 교통제어 시스템은 고정된 녹색 신호의 길이와 주기를 갖고 있다. 그에 따라 차선 간 차량 밀집도가 불균형한 경우 교통 처리량이 저하되고 응급상황이 발생할 경우 지정체가 유발된다. 본 논문에서는 VANET을 이용하여 교통량의 실시간 정보를 수집해 적응적으로 교통 신호를 제어하는 시스템을 제안한다. 차량의 수, 평균 신호대기 시간, 차선 간 균형, 응급상황 등을 고려하여 교통 신호를 가변적으로 제어 한다. 차량이 교차로에 진입하기 전 통신모듈을 갖고 있는 신호등에게 위치, 방향, 속도 정보 등을 송신하고 traffic control system에서 교통량을 분석하여 녹색 신호를 가변적으로 할당 한다. 실험결과 제안 기법이 교통 처리량, 평균 신호대기시간에서 기존 교통신호 제어 기법보다 높은 성능을 확일 할 수 있었다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.11a
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• pp.152-154
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• 2000

서울지역의 자동차에 대한 정확한 대기오염 기여도의 확인 없이 대기오염의 약 85%를 자동차가 차지하는 것으로 추정하여 광화학 스모그(고농도 오존농도) 유발 등이 자동차의 기여로 간주하고 있다. 따라서, 서울의 대기오염의 주원인으로 간주하고 있는 선오염원에 대한 자료 구축의 체계가 조속히 확립되어야 할 필요성이 대두되고 있다. (중략)

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.126-127
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• 2003

서울의 시정장애 현상은 80년 이후부터 계속 심화되고 있어 ‘서울 스모그’라는 새로운 용어를 탄생시키기에 이르렀다. 서울 스모그 발생은 가정용 연료의 연소와 노천소각에 의한 일부 원인과 함께, 대부분은 자동차 배출물질에 의해 유발되는 광화학 스모그는 미세한 입자상 물질에 의해 복합적으로 나타나는 것으로 알려져 있다. 서울지역의 자동차로부터 배출되는 오염비중은 1991년 54.4％에서 매년 증가하며 1997년부터 85％를 넘어섰다. (중략)

• Korean System Dynamics Review
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• v.12 no.1
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• pp.75-87
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• 2011

Congestion problems can be approached from the viewpoint of system dynamics theory. The relationship between road capacity and congestion can be explained by the 'relative control' archetype among four system archetypes suggested by Wolstenholme. There is a balancing feedback loop between road capacity and road congestion. However, there is another balancing loop between road congestion and car traffic volume, which keeps disrupting the equilibrium of the former loop. A system dynamics model, which is based on a partial adjustment model of induced traffic in the literature, is built to simulate three road building scenarios: 'Expanding investment', 'Balancing investment' and 'Frozen road investment' scenarios. The 'Expanding investment' scenario manages to drop congestion levels by 9% over 30 years, however, causing much higher emissions of $CO_2$ than other scenarios. The trade-off relationship between congestion levels and environmental costs must be taken into consideration for road investment policies.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.401-403
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• 2013

세계적으로 선박 교통량 증가와 함께 선박 사고 원인의 90% 이상을 차지하는 인적요인에 대한 심층적인 연구의 필요성이 대두되고 있다. 해상교통관제 업무는 고도의 주의와 예측능력을 요구하며 이를 저해하는 인적요인 분석 및 관리 필요성이 절실한 분야이다. 특히 관제업무는 교대근무 등의 불규칙한 근무형태로 인해 발생되는 피로와 업무 집중력 저하, 스트레스가 많은 업무이다. 무엇보다 관제 업무는 해상안전에 핵심적인 역할을 하는데, 관제사의 피로와 스트레스로 인한 업무 차질은 자칫 안전사고로까지 이어질 수 있는 위험이 존재한다. 이렇듯 인적요인이 중요한 영역임에도 불구하고 관제사들의 체계적인 스트레스 관리에 대한 방안은 미비한 실정이다. 본 연구에서는 직무스트레스 유발요인, 유발결과 및 설문조사를 통하여 관제사들의 직무스트레스 현 실태를 파악하고자 한다. 그리고 연구결과를 바탕으로 관제사의 피로, 스트레스를 관리하기 위한 방안과 더 나아가 효율적인 인적요인 안전관리 방안을 모색하고자 한다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.4D
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• pp.469-476
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• 2008

Recently, TOD gains popularity as a traffic solution measure of high density urban regeneration projects. The purpose of this study is to investigate traffic impacts of high density TOD projects, and to identify the issues to be resolved. For a case study, it chooses Gangnamgucheong station in Gangnam area served by two subway lines, and designates 400m radius from the station as a site for high-density development. The MOEs chosen for this study is traffic volume, time, distance, speed, and mode share. The SECOM model is adopted for traffic simulation. The analysis results show that high-density TOD is an effective tool for traffic improvement even with only one station area being implemented. It is found that the traffic volume increases near the station in nature where high-density development occurs, but it declines overall in the rest of Gangam area. The total travel time and distance of passenger vehicles decline, meaning that the traffic condition becomes better than before. With regulation on parking supply, the improvement becomes more vivid. In terms of the changes of traffic speed, both alternatives show 4.1% increase in speed, but the difference between alternatives is not quite noticeable because of the induced vehicle demand driven to the streets with improved traffic condition. The mode share changes occur for the benefit of subway ridership, because the study station is equipped with two subway line services. When mixed with parking supply restriction, the impact becomes clearer.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.1
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• pp.235-241
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• 2014

There are many traffic problems in a city such as parking, traffic jam caused by traffic induction facility. Therefore it is essential to demand for traffic demand management to building's owner whose building location causes traffic induction. According to the 90s traffic policy, government collects fee for traffic induction facility through traffic policy management and they encourage the building owner to join reduction of traffic jam program by reduction of traffic induction fee. However there are not many buildings owner joined this program because the program is not ghat beneficial. For example, if government set out parking guidance system (part of parking demanding system) in a city, it will reduce to 20% of traffic induced contributions but t can be used only once a year, so it is not efficient to used even it is valuable for about 10 years. In particular, according to the economic efficiency analysis, evaluate economically as net present value (NPV) to 2,160.44 million won, ratio of benefit/cost (B / C) to 2.44 during 10 years. Therefore this research will find out what is necessary for parking guidance system.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.495-499
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• 2003

As an alternative to overcome the limitations of current popular schedule system such as Bar Chart, PERT, CPM in proving the feasibility of a given project schedule and duration, this research applies simulation to the 'Shiwha Techno-Valley project, and then reviews its usability in time management. Shiwha-Techno-Valley is a gigantic project requiring large number of equipment and resulting in traffic congestion. In particular, project site is located near the Shiwha industrial complex and Daeboo-Do tourist place. Therefore, current traffic needs should not be ignored. This research evaluates whether the project can be finished in a given time even if construction equipment increase in addition to the current traffic. Through the analysis of the simulation output, the research identifies the optimal resource input and the needs on alternative schedule for the project.

• Journal of Korean Society for Geospatial Information Science
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• v.5 no.2 s.10
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• pp.131-144
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• 1997

Traffic jam densified day by day is phenomenon to occur lack of the road capacity in comparison with traffic density, but lack of the road cannot be concluded by main cause of traffic ism. Because the central function of a city would be concentrated upon the downtown and traffic demand would not be evenly distributed by the classification of an hour. Therefore, this study based on the fact that each driver will select the route generating traffic delay very low when path choice from origin to destination in travel plan estimating the quality of passage could be maintained the speed he want will approach to a characteristic grasp of a road, traffic, driver changing every moment by traffic-demand of road increased as a geometrical series with analysis a classification of a street, a intersection along the path on traffic density and highway capacity analysis the path using GIS techniques about complex street network, also will get the path of actual optimum for traffic delay trend creating under various condition the classification per a hour, a day of week and an incident through network such as analysis for traffic generation zone adjacent about street, intersection, afterward will expect the result increasing efficiency of the road-use through a good distribution of traffic by optimum-path choice, accordingly will prepare the scientific, objective, appropriate basis to decide the reasonable time of a road-widen and expansion through section analysis along a rate of traffic volume vs. road capacity.

• Journal of Navigation and Port Research
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• v.38 no.6
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• pp.615-621
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• 2014

VTS operators may suffer from acute, chronic, or traumatic stress caused by their workload and working environments associated with task or combination of task. This study intended to measure the level of VTS operator' stress and find out factors influencing it by understanding their characteristics during carrying out their task. For this purpose, analyzed the data collected through conducting survey on VTS operators as the Korea Occupational Stress(KOSS) and Psychological Well-being Index(PWI). As a result, VTS operators are experiencing higher level of psychological stress than the national average. And the factors to cause VTS operators' occupational stress can be summarized as follows; working environment factors, shift work especially night duty, workload, etc. This study provides the fundamental information for understanding human factors of VTS operator' occupational stress.