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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of The Korea Institute of Intelligent Transport Systems
Journal Basic Information
Journal DOI :
The Korea Institute of Inteligent Transport Systems
Editor in Chief :
Volume & Issues
Volume 13, Issue 6 - Dec 2014
Volume 13, Issue 5 - Oct 2014
Volume 13, Issue 4 - Aug 2014
Volume 13, Issue 3 - Jun 2014
Volume 13, Issue 2 - Apr 2014
Volume 13, Issue 1 - Feb 2014
Selecting the target year
Text Area Detection of Road Sign Images based on IRBP Method
Chong, Kyusoo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 6, 2014, Pages 1~9
DOI : 10.12815/kits.2014.13.6.001
Recently, a study is conducting to image collection and auto detection of attribute information using mobile mapping system. The road sign attribute information detection is difficult because of various size and placement, interference of other facilities like trees. In this study, a text detection method that does not rely on a Korean character template is required to successfully detect the target text when a variety of differently sized texts are present near the target texts. To overcome this, the method of incremental right-to-left blob projection (IRBP) was suggested as a solution; the potential and improvement of the method was also assessed. To assess the performance improvement of the IRBP that was developed, the IRBP method was compared to the existing method that uses Korean templates through the 60 videos of street signs that were used. It was verified that text detection can be improved with the IRBP method.
Development of Comprehensive Evaluation Index for In-vehicle Warning Information Systems
Joo, Shinhye ; Oh, Cheol ; Hong, Sungmin ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 6, 2014, Pages 10~24
DOI : 10.12815/kits.2014.13.6.010
In-vehicle warning information systems(IWIS) is an effective countermeasure for preventing traffic crashes. It provides drivers with warnng messages about upcoming hazards to draw proper evasive maneuvering. This study developed a methodology for evaluating the effectiveness of IWIS based on an integrated index to identify driver's responsive behavior. The proposed index consists of characteristics of longitudinal and lateral behavior of vehicle maneuverings. Also, a method to assign mixed-weights in the context of multi-criteria decision making framework was adopted to develop the evaluation method. It is expected that the outcome of this study is useful in designing more effective in-vehicle warning information systems.
Treatment Strategy and Reliability Analysis of DSRC-Based Traffic Data under Interrupted Traffic States
Ren, Yu ; Kim, Hoe Kyoung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 6, 2014, Pages 25~33
DOI : 10.12815/kits.2014.13.6.025
This study investigates the reliability of DSRC-based traffic information system on the typical urban arterial with the minimum sample size method. VISSIM has been employed to calculate the required sample size. After comparing the number of hi-pass vehicles recorded from DSRC and the required sample size, this study found that the interrupted traffic state tends to generate more outliers than the uninterrupted one, the lack of the number of vehicles completely passing links with multiple driveways makes it difficult to estimate the reliable traffic information, the traffic information during peak hour is relatively more reliable than that during off-peak hour, and the reliability of DSRC-based traffic information system depends on the significance level in calculating the sample size. The driveway density and traffic signal operation due to the individual link length significantly affects the required sample size, resulting in determining the reliability of the DSRC-based traffic information system.
Determination of Emergency Evacuation Roads Considering Road Network Function and Connectivity
Noh, Yunseung ; Do, Myungsik ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 6, 2014, Pages 34~42
DOI : 10.12815/kits.2014.13.6.034
This study is a fundamental research to determine the emergency evacuation roads considering road network function and connectivity. First of all, the functional aspects of the road networks are analyzed in the target area, Sejong city, by using degree centrality(DC) and closeness centrality(CC) from GIS based database. Secondly, how network connectivity makes a change in user's travel pattern and travel time and how it affects the whole network are analyzed using TransCAD simulation program. Finally, after performing cluster analysis of index, first and second emergency evacuation roads are determined by judging the characteristics of clusters. The results of this research will be helpful for making a decision to diminish secondary damages when confronting unexpected disasters.
Performance Evaluation of Handover Mechanism in WAVE Communication System
Jung, Han-Gyun ; Lim, Ki-Taeg ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 6, 2014, Pages 43~53
DOI : 10.12815/kits.2014.13.6.043
Supporting handover functionality in V2I communication environments is important to provide higher quality service to users on the road. Wireless Access in Vehicular Environments(WAVE) standards define some features that devices can communicate with each other more efficiently in vehicular environments but they do not include handover function for providing effective V2I services. In this paper, we introduce a handover scheme in WAVE system and show the performance result of proposed scheme.
Analysis of Accident Characteristics and Improvement Strategies of Flash Signal-operated Intersection in Seoul
Kim, Seung-Jun ; Park, Byung-Jung ; Lee, Jin-Hak ; Kim, Ok-Sun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 6, 2014, Pages 54~63
DOI : 10.12815/kits.2014.13.6.054
Traffic accident frequency and severity level in Korea are known to be very serious. Especially the number of pedestrian fatalities was much worse and 1.6 time higher than the OECD average. According to the National Police Agency, the flash signals are reported to have many safety benefits as well as travel time reduction, which is opposed to the foreign studies. With this background of expanding the flash signal, this research aims to investigate the overall impact of the flash signal operation on safety, investigating and comparing the accident occurrence on the flash signal and the full signal intersections. For doing this accident prediction models for both flash and full signal intersections were estimated using independent variables (geometric features and traffic volume) and 3-year (2011-2013) accident data collected in Seoul. Considering the rare and random nature of accident occurrence and overdispersion (variance > mean) of the data, the negative binomial regression model was applied. As a result, installing wider crosswalk and increasing the number of pedestrian push buttons seemed to increase the safety of the flash signal intersections. In addition, the result showed that the average accident occurrence at the flash signal intersections was higher than at the full signal-operated intersections, 9% higher with everything else the same.
A Study on Estimation of Vehicle Miles Traveled
Ahn, Won-Chul ; Park, Dong-Joo ; Heo, Tae-Young ; Yeon, Ji-Youn ; Kim, Chan-Sung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 6, 2014, Pages 64~76
DOI : 10.12815/kits.2014.13.6.064
This study identified the causes of errors that could take place in the estimation process of vehicle miles traveled and quantified the effects of each of those causes on the estimation accuracy of vehicle miles traveled via error rate to propose an efficient way to estimate vehicle miles traveled. The study proceeded as follows: first, the study established survey data of vehicle miles traveled in the pilot test areas to test the accuracy of a method to estimate vehicle miles traveled. Second, the causes of errors with the estimation of vehicle miles traveled were categorized into errors with the sample size, sampling methods, and homogeneous link setting methods. In addition, many different methodologies were set to minimize errors with the estimation of vehicle miles traveled according to each of the causes. Third, error rates of estimation of vehicle miles traveled were compared and analyzed according to each of the methodologies. Finally, a toy network was established to propose a way of estimating vehicle miles traveled by taking the local characteristics into consideration. The study finds its significance in that it proposed an efficient way to estimate vehicle miles traveled through an experiment and planning approach and made use of survey data of vehicle miles traveled to test estimation accuracy. The proposed way of estimating vehicle miles traveled by taking into account the local characteristics will make a contribution to the estimation of vehicle miles traveled by the areas in future along with the level of data offered in the study.
A Study on Effectiveness of Safety Barriers Restraining Illegal Pedestrian Crossing on Exclusive Median Bus Corridor - Case Study at Sookmyung Women's University Bus Station -
Kim, Jin-Tae ; Kim, Jun-Young ; Bae, Hyun-Sik ; Lee, Dong-Il ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 6, 2014, Pages 77~87
DOI : 10.12815/kits.2014.13.6.077
It has reported that a median bus-stop island on an exclusive median bus lane (EMBL) has shortened a crossing distance unit, encouraged a pedestrian's illegal crossing, and increased the number of accidents in the area. This study presents (1) the analysis of inappropriate pedestrian crossing patterns collected on exclusive median bus corridors and (2) the estimated performance of safety barriers restraining the occurrence of those. Total 19,649 pedestrian crossing data collected at the 'Sookmyung-university' median bus-stop, and the inappropriate pedestrian crossing patterns among those were grouped in terms of time and space violations. Physical safety barriers restraining illegal pedestrian crossings were considered as an alternative, and its performance in safety was quantified through microscopic simulation with conflict analyses by using surrogate safety assessment model. The findings suggest the number of conflicts reduced be 24.9 percentages compared to the one of the present condition when the physical safety barriers are placed at each of the eight ends of the EMBL pedestrian crossing.