• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.2
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• pp.186-192
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• 2014

In this paper, we analysed vessel traffic volume and patterns of traffic flow for ships using areas where included wind farm site and adjacent waters of Daejeong Offshore Wind Farm, and estimated traffic volume by classified navigational routes according to suggestion of rational routeing measures on the basis of classified patterns after installation of offshore wind facilities. Also, we assessed vessel traffic safety for each designed routeing measures on the basis of estimated traffic volume and proposed requisite countermeasures for the safe navigation of ships. With a result of analysing patterns of traffic flow, the current traffic flow was classified by 8 patterns and the annual traffic volume was predicted to 8,975 ships. On the basis of these, expected the vessel traffic volume according to designed four routeing mesaures after installation of wind farm. As result of assessing vessel traffic safety by using powered-vessel collision model of SSPA on the basis of the estimated traffic volume, the value of collision probability was less than safe criteria $10^{-4}$. Thereby we made sure usability of the designed routeing measures for the safe navigation of ships.

• Journal of Korean Society of Transportation
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• v.27 no.3
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• pp.141-148
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• 2009

An inappropriate evaluation of capacity leads to the incorrect and impractical result due to the transfer of error to the analysis and the evaluation on highway system. The traffic accident which reduces the capacity of road temporarily generates unpredictable congestion, causing difficulties in congestion management. Therefore, this research aims on the measurement of the capacity of the road in accordance to the speed at the accident which is a basic factor when performing analysis. Based on the given approach, the behavior of a vehicle in highway is understood to develop model of critical gap and model of maximum flow rate with respect to the speed of traffic flow. With the established model, the reduction rate of the capacity in highway system at the accident is measured. The result shows that the capacity is reduced by 37% when the speed of the traffic flow is 40km/h. Although the developed model can't be verified clearly, this research has shown that the reduction rate of the capacity in road system has a close relation to the speed.

• Journal of Korean Society of Transportation
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• v.19 no.5
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• pp.85-97
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• 2001

In this study, the purpose behind this research is to propose index to be used for classification of functional the urban streets and to select the feasible length of special management link by the index. This special management link help decision makers found a transportation policy. In order to perform functional classification, index such as average traveled distance, link VKT and VKT per length-lane are use at the study. Average traveled distance index is average traveled distance divided by length of Path k and VKT per length-lane is trip volume characteristic considering lanes and length of Path k. Special management links on which major part of the vehicle are selected with using Path-VKT which represents how many long-distance touring vehicles are on the arterial road. The selection of special management links are performed with network composed of 14 paths (arterial roads) in seoul The total distance of special management links resulted from the above analysis is 141km(35.0% of the whole paths length) and total VKT of the special management links is 4,152,475 VKT(45.2% of the whole paths VKT)

• Journal of KSNVE
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• v.8 no.1
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• pp.13-20
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• 1998

도시생활에서 가장 짜증스러운 것은 자동차 소음이다. 경제발전과 더불어 인구의 도시 집중과 급격한 차량증가는 교통량이 많은 간선도로변을 중심으로 도로교통 소음문제가 야기되고 있으며, 우리나라도 지난 '97. 7월 자동차 1000만대 보유국이 되었다. 도로교통 소음은 자동차에서 발생하는 소음과 차량의 통행량, 차량의 주행속도및 도로주변 조건등 각종 요인이 복합 된 것으로 저속운행이 일반적인 도시에서는 자동차에서 발생하는 소음 중 엔진에서 나는 소음이 대개 60% 이상을 점하게 된다. 이러한 문제점 등을 감안하고 쾌적한 생활 환경 조성을 위하여 환경부에서는 제작차 소음 허용기준을 정하여 제작차가 시판되기전 단계에서 제작차 소음 허용기준에 적합하게 제작되는지 여부를 관리하기 위하여 인증제도를 시행 중에 있으며, 인증 시험에 통과된 차량에 대해서만 제작 시판할 수 있도록 법제화하여 운영하고 있다. 인증에 필요한 시험은 자동차의 가속주행소음, 배기소음 및 경적소음 시험으로써 본 장에서는 제작차 인증시험과 평가방법 등을 소개하고, 아울러 도로교통 소음 진동에 대하여서도 기술하고자 한다.

• The Journal of the Acoustical Society of Korea
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• v.9 no.3
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• pp.5-10
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• 1990

This study was examined for traffic noise by platoon dispersion in relation to traffic flow till platoon reach steady driving condition after starting from stopline. Platoon dispersion factor was calculated and evaluated by the following input data : traffic volume, travel time, pass time.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.2
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• pp.48-61
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• 2020

The objective of this study is to estimate traffic capacity based on the heavy-vehicle ratio in a two-lane freeway work zone where one lane is blocked by construction. For this, closed circuit television (CCTV) video data of the freeway work zone was collected, and the congestion at an upstream point was observed. The traffic volume at a downstream point was analyzed after a bottleneck was created by the blockage due to the upstream congestion. A distribution model was estimated using observed-time headway, and the road capacity was analyzed using a goodness-of-fit test. Through this process, the general capacity and an equation for capacity based on the heavy-vehicle ratio passing through the work zone were presented. Capacity was estimated to be 1,181~1,422 passenger cars per hour per lane (pcphpl) at Yeongdong, and 1,475~1,589pcphpl at Jungbu Naeryuk. As the ratio of heavy vehicles increased, capacity gradually decreased. These findings can contribute to the proper capacity estimation and efficient traffic operation and management for two-lane freeway work zones that block one lane due to a work zone.

• Journal of the Economic Geographical Society of Korea
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• v.9 no.3
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• pp.379-395
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• 2006

The purpose of this study is to analyze the spatial characteristics of travel patterns and travel behaviors of transit users in the Metropolitan Seoul area. We apply the data mining techniques to explore the travel patterns of transit users from the T-money card database which has been produced over 10,000,000 transaction records per day. The database contains the information of locations and times of origin, transfer, and destination points for each transaction as well as the informations of transit modes taken via the transaction. We develop an data mining algorithm to explore traversal patterns from the enormous information. The algorithm determines the travel sequences of each passenger, and produce the volumes of support on each points (stops) of transportation networks in the Metropolitan Seoul area. In order to visualize the spatial patterns of travel demands for transit systems we apply GIS techniques, and attempt to investigate the spatial characteristics of travel patterns and travel demand. Subway stops located in the Gangnam area appear the highest peak for the travel origin and destination, while the CBD in the Gangbuk stands at the second position. Two or three sub-peaks appear at the densely populated residential areas developed as the high-rise apartment complex. Subway stations located along the Subway Line 2, especially from Guro to Samsung receive heavy travel demand (total support), while bus stops located at the CBD in the Gangbuk stands the highest travel demand by bus.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.4
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• pp.91-103
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• 2016

The work zone traffic management is of keen interest because the unstable traffic stream in work zones leads to not only less productive traffic operational efficiency but also negative impacts on traffic safety. A promising method to address such issues is variable speed limit systems(VSLS). VSLS is expected to increase in throughput and to enhance safety by diminishing the crash potential. In addition, the usefulness of VSLS has been demonstrated by significant amount of existing literature. The objective of this study is to identify the effectiveness of VSLS based on a meta analysis technique. Throughput and travel speed were used as measures of effectiveness for VSLS in terms of the operational efficiency and safety respectively. Results showed that approximately 16.4% increase in throughput and 16.5% decrease in travel speed were obtainable by VSLS. The outcomes of this study would be useful in developing technologies and polices for better operation of VSLS.

• Journal of Korean Society of Transportation
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• v.15 no.1
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• pp.45-62
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• 1997

이 논문은 O-D 접근방법과 P-A 접근방법을 이론적으로 서로 비교한 연구이다. O-D 접근방법은 전통적인 교통수요 4단계 분석기법의 모든 과정에서 통행수 산출을 통행 유출과 통행유인의 개념을 적용하여 O-D 통행량을 사용한 기법으로 정의되었다. 이러한 O-D 접근방법은 우리 나라에서 보편적으로 사용되고 있는 기법이다. P-A 접근방법은 통행 발생, 통행분포, 교통수단선책 분석과정까지 통행생성과 통행유인의 개념을 적용하여 P-A 통행량을 사용한 기법으로 정의되었으며, 노선배경 분석단계에 앞서 P-A 통행량을 O-D 통 행량으로 전환되어져야 한다. P-A 접근방법은 구미국가들에서 보편적으로 사용되는 기법이 다. 이러한 두 접근방법은 통행목적 분류에서 귀가통행이 별도로 분류되어있는가 혹은 아닌 가에 따라 쉽게 구분되어 질 수 있다. 만일 귀가통행이 통행목적의 분류에서 별도로 구분되 어 있으면 O-D 접근방법이 적용되고 있음을 의미하는 것이다. 이 연구는 전통적 교통수요 4단계 분석과정 중 통행발생, 통행분포 및 교통수단선택의 각 분석과정에서 두 접근방법간 의 이론적 차이점을 명확히 비교 분석하고자 하였다. 그러므로써 형태적 통행패턴을 상대적 으로 잘 설명하며 또한 집합적 오차를 상대적으로 초 lth화할 수 있는 기법이 어느 것인가 를 이론적으로 찾고자 하였다. 이 연구에서는 행태적 측면에서 통행패턴을 P-A 접근방법이 더 잘 표현하고 있으며 또한 집합화 오차도 P-A 접근방법이 더 적으므로 P-A 접근방법이 O-D 접근방법보다 이론적으로 더 우수하다고 결론지었다. 또한 이 연구는 통행발생, 통행 분포, 교통수단선택 분석과정이 끝난 후 P-A 통행량에서 O-D 통행량으로 전환하는 것이 통행발생, 통행분포의 분석과정이 끝난 후에 O-D 통행량으로 전환하는 것보다 더 바람직하 다고 추천하였다.

• Journal of Korean Society of Transportation
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• v.34 no.4
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• pp.354-372
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• 2016

This study identified factors affecting the crash severity at freeway work zones. A nice feature of this study was to take into account the characteristics of work zone traffic management in analyzing traffic safety concerns. In addition to crash records, vehicle detection systems (VDS) data and work zone historical data were used for establishing a dataset to be used for statistical analyses based on an ordered probit model. A total of six safety improvement strategies for freeway work zones, including traffic merging method, guidance information provision, speed management, warning information systems, traffic safety facility, and monitoring of effectiveness for countermeasures, were also proposed.