• 한국안전학회지
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• 제25권3호
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• pp.131-136
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• 2010

This study deals with the accident models of arterial link sections by vehicle type. The objectives are to analyze the characteristics of accidents, and to develop the models by type. In pursuing the above, this study uses the data of 414 accidents occurred on 24 major arterial links in 2007. The main results analyzed are as follows. First, the number of accidents is analyzed to account for about 47% in passenger car, 15% in SUV and 10% in trucks. Second, 3 Poisson regression models which are all statistically significant are developed using passenger car, SUV and truck as dependant variables. Finally, AADT and the number of traffic islands as common variables, and the number of pedestrian crossings, lanes, connecting roads, intersections(4-Leg), rate of medians and the number of bus stops as specific variables of the models are selected.

• 대한교통학회지
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• 제5권2호
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• pp.19-35
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• 1987

Transportation energy saving is a national concern because all national petroleum energy is imported. A number of intersections are operating as semi-protected intersections, which have left-turn signal but not exclusive left-turn lanes, because of limited roadways in urban areas. Since the traffic signal methods for the intersections having left-turn signal/lanes cannot be applied to the semi-protected intersection, it is needed to develop a new technique. The purpose of this study was to develop a traffic signal timing method at semi-protected intersections for energy saving and to computerize the method for the practical use. A probability model which could estimate left-turn utilization factors of through traffic during green signal was developed based on field studies. Employing the factors, macro-models to estimate vehicular average delay and proportions of vehicles stopped at the semiprotected intersections were developed. The calculated values of the delay model agreed well with the simulated values of a simulation model using SLAM Ⅱ, a simulation language. Using the two models and the idling fuel consumption rate and the excess fuel consumption per stop-go speed change of vehicles. a traffic signal timing method at semi-protected intersections for energy saving was developed and computerized. The method can be used for other measures of effectiveness such as minimum delay, minimum stop ratio, etc.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1997년도 춘계 학술대회 발표집
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• pp.81-85
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• 1997

In a virtual environment, agents must demonstrate some degree of realism and interactivity. This paper discusses the algorithm that enables agents to navigate a virtual road network realistically and interactively. The road description files written in this language provide the information of road environments to the navigating agents and the scene visualizer. We call this navigating agent in the road an ambient car. The ambient cars must follow the traffic rules as human does. To do this, the ambient car should continuously check its circumstances, such as, the traffic lights, lanes, road signs, and other ambient cars. Because of the huge scale of road network and the large number of ambient cars, the algorithm considers only the area where the participant is currently located. By this locality, the performance of the whole system does not fluctuate much in different situations. The behavior of ambient cars according to the predefined rules may appear monotonous. We added probability distribution functions to introduce some randomness. We implemented the above idea on silicon Graphics Indigo 2 workstation. The ambient car exhibited its awareness of lanes, traffic lights, and other cars. The participants could hardly distinguish between a human-controlled car and computer-controlled ambient car generated by the algorithm.

• 화약ㆍ발파
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• 제22권3호
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• pp.65-70
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• 2004

최근 신설되는 도로의 경우 고속화/직선화로 인하여 터널의 연장 및 평균터널 길이, 3차선이상의 대 단면 터널이 날로 증가하고 있어 이에 따른 굴착 효율 극대화가 필요한 시점에 있다. 사패산 터널은 약 4km의 4차선 대단면 도로터널로, 환경문제로 인해 늦춰진 공기를 단축시키기 위하여 터널 굴착 시 굴진효율에 가장 큰 영향요소인 굴진장과 여굴관리, 발파효율의 개선을 위한 다양한 신 공법이 적용되고 있다. 본 논문은 당 현장에서 시도되고 있는 신 공법 중, 새로운 형태의 폭약인 Bulk 폭약에 대하여 소개하고, Bulk 폭약의 대 단면 터널 적용에 대한 효율을 검증하고자 하였다.

• 정보처리학회논문지A
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• 제14A권7호
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• pp.391-398
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• 2007

본 논문에서는 차세대 모바일 단말 카메라 표준 인터페이스인 MIPI CSI-2 및 D-PHY를 설계하였다. 제안된 CSI-2는 레인별로 존재하는 버퍼를 하나로 통합하여 송수신단이 지원하는 레인의 개수가 다른 경우에도 유연하게 관리 될 수 있는 멀티레인관리계층을 가진다. 설계된 CSI-2 및 D-PHY는 테스트 벤치를 통해 RTL 검증되었다. 또한 FPGA로 합성된 후 테스트 베드를 통해 기능 검증이 이루어 졌으며, 실제 단말기에 적용하여 동작 여부를 확인 하였다. 설계된 CSI-2 및 D-PHY 모듈은 브리지 형태로 제공되어 기존의 카메라 센서와 호스트 프로세서와 오프 칩 형태로 사용할 수 있을 뿐 아니라, 차세대 모바일 카메라 컨트롤러와 온 칩 화 가능한 IP 형태로도 사용 가능하다.

• 한국도로학회논문집
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• 제15권2호
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• pp.131-138
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• 2013

PURPOSES : The intents of the study are to identify the accident factors and to demonstrate the potentials of tobit model as a tool to study the number of accidents on arterial roads segments. METHODS : This paper uses a tobit regression as a methodology to analyze the factors affecting the number of accidents. In pursuing the above goal, this study gives particular attentions to analyzing the data of 2,446 accidents (1,610 in major arterial roads and 836 in minor arterial roads) occurred on arterial roads in 2007 to 2010. RESULTS : First, 3 accident models which were classified by total arterial roads, major arterial roads and minor arterial roads, and were all statistically significant were developed. Second, the exclusive right-turn lane as common variable, and the number of accident, traffic volume, number of lanes, link length, rate of median, number of entrances, number of pedestrian crossings, number of curves, number of bus stops and exclusive left-turn as specific variables of the models were selected. Finally, the paired sample t-test could not be rejected the null hypotheses of three types of models. CONCLUSIONS : Using data from vehicle accidents on arterial roads, the estimation results show that many factors related to roadway geometrics and traffic characteristics significantly affect to the number of accidents.

• 한국도로학회논문집
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• 제19권4호
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• pp.53-59
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• 2017

PURPOSES : This study deals with traffic accidents involving trucks. The objective of this study is to develop a traffic accident model for trucks at roundabouts. METHODS : To achieve its objective, this study gives particular attention to develop appropriate models using Poisson and negative binomial regression models. Traffic accident data from 2007 to 2014 were collected from TAAS data set of road traffic authority. Thirteen explanatory variables such as geometry and traffic volume were used. RESULTS : The main results can be summarized as follows: (1) two statistically significant Poisson models (${\rho}^2=0.398$ and 0.435) were developed, and (2) the analysis revealed the common variables to be traffic volume, number of exit lanes, speed breakers, and truck apron width. CONCLUSIONS : Our modeling reveals that increasing the number of speed breakers and speed limit signs, and widening the truck apron width are important for reducing the number of truck accidents at roundabouts.

• 한국도로학회논문집
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• 제12권4호
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• pp.17-28
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• 2010

오르막차로는 오르막 구간에서 속도 감소가 큰 대형차의 혼입률이 증가하여 교통용량의 감소가 크게 예상되는 경우, 고속 교통류에서 저속 교통류를 분리하기 위해서 설치된다. 오르막차로와 관련된 기존의 연구는 오르막차로의 구간선정, 시종점 위치, 설치방법 등 주로 도로설계기준과 관련된 내용에 집중되어 왔다. 그러나, 교통운영측면에서 오르막차로는 교통량이 증가할 경우 주요한 병목지점이 된다고 알려져 있는 바, 본 연구에서는 교통운영측면에서 교통량(v/c), 중차량비, 종단경사에 따라 오르막차로 일시 폐쇄가 혼잡 감소에 미치는 영향을 파악하고 아울러 적절한 교통운영기준을 수립하고자 하였다. 중부내륙고속도로 낙동분기점 부근의 오르막구간(136.9K~133.3K, 길이 3.6km, 구배 3.7%)을 대상구간으로 선정하여 교통운영변수에 따른 시뮬레이션 분석을 수행한 결과, 교통량과 중차량비가 오르막차로의 주요한 교통운영기준이 되는 것으로 나타났다. 즉, 오르막차로로 인한 혼잡을 막기 위해서는 교통량비가 0.8이고 중차량비 50%일 때 종단경사와 상관없이 폐쇄하는 것이 효과적이며, 교통량비 1.0일 경우에는 중차량비, 종단경사와 상관없이 오르막차로 폐쇄가 효과적으로 나타났다. 특히 일반적인 소통상황에서는 오르막차로 운영효과가 더 큰 것으로 나타나, 교통량 및 중차량비의 변화에 따라 오르막차로의 탄력적 운영이 필요함을 알 수 있었다. 본 연구를 계기로 도로시설의 탄력적 운영기준에 대한 연구가 활성화될 수 있을 것으로 기대된다.

• 한국도로학회논문집
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• 제18권5호
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• pp.127-134
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• 2016

PURPOSES : Visibility of lanes on the road improves as retro-reflectivity rises. This helps reduce traffic accidents at nighttime or in bad weather. This study aimed to evaluate the effects of improved visibility on reduction of traffic accidents when the color of the lane in the median of the highway was changed from yellow to white. METHODS : In order to evaluate the accident reduction effect of the white left shoulder line, Hauer (1997)'s Comparison-Group method was chosen as an analysis methodology. The JungBu-2 highway, which is equipped with the white left shoulder line and is in trial operation, was chosen as a target for analysis. Data of accidents for 10 months before and after installation was collected and analyzed. In addition to the number of accidents, the types of accidents were classified into nighttime accidents, accidents in bad weather, and median collisions. The accident reduction effect of improved visibility of lanes was analyzed. RESULTS : The analysis' finding showed that installation of the white left shoulder line decreased the number of accidents by 28%. Moreover, improvement in visibility was effective in reducing nighttime accidents by 67.63%, accidents in bad weather by 55.19%, and median collisions by 48.55%. CONCLUSIONS : Based on the analysis' results in this study, it was concluded that white left shoulder line on the freeway contributed to reduce traffic accidents, especially nighttime accidents, accidents in bad weather, and median collisions.

• 대한교통학회지
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• 제31권4호
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• pp.58-66
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• 2013

도시고속도로는 교통량이 많고 주행속도가 높아 도로점용 공사 시 교통사고 위험 뿐만 아니라 차로 수 감소, 차로 변경, 가감속 등의 증가로 마찰이 증대되어 교통정체를 야기한다. 본 연구는 공사구간을 효율적으로 운영관리 하기 위해서 이동성과 안전성의 두 가지 측면을 만족하는 공사구간 적정 완화구간 길이 산정을 목적으로 한다. 분석을 위해 차로수별 3가지 시나리오를 구성하였고, 각 시나리오별로 완화구간 길이를 100-500m까지 100m 간격으로 변화시키며 적정 완화구간 길이를 결정하였다. 그 결과, 편도 3, 4차로 도로의 1차로 점용 공사 시 300m, 편도 2차로 도로의 1차로 점용 공사 시 200m로 나타났다. 편도 차로 수에 따라 동일한 완화구간 길이로 운영하는 것보다는 차로 수에 따라 다르게 운영하는 것이 우수하다는 결과를 도출하였다.