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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of The Korea Institute of Intelligent Transport Systems
Journal Basic Information
Journal DOI :
The Korea Institute of Inteligent Transport Systems
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Volume & Issues
Volume 14, Issue 6 - Dec 2015
Volume 14, Issue 5 - Oct 2015
Volume 14, Issue 4 - Aug 2015
Volume 14, Issue 3 - Jun 2015
Volume 14, Issue 2 - Apr 2015
Volume 14, Issue 1 - Feb 2015
Selecting the target year
Applicability Evaluation of FMCW Radar Detector on Signal Intersections
Ko, Kwang-Yong ; Kim, Min-Sung ; Lee, Choul-Ki ; Jeong, Jun-Ha ; Heo, Nak-Won ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 1~12
DOI : 10.12815/kits.2015.14.1.001
Intrusive Vehicle Detectors have excellent detection performance compared to other types of detector, but disadvantages of high installation and maintenance costs, short life time due to greater damage to roads and paving materials. In contrast, Non-Intrusive Vehicle Detectors attached to the stationary pole have advantages because it does not damage the road surface and easy and less expensive to maintain. Despite these advantages, Non-Intrusive type detectors are still not been widely used in traffic signal control systems because of the low detection performance. In this study, a FMCW(Frequency Modulated Continuous Wave) radar Vehicle Detector was designed as an alternative detector for the signalized intersection, and the performance evaluation was presented by purpose applicability.
A Study on the Operational Efficiency of Intersection Shared Lanes
Park, Kun-Young ; Lee, Si-Bok ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 13~21
DOI : 10.12815/kits.2015.14.1.013
This study focuses on operational analysis of 2 types of intersection shared lanes. First, the analysis showed that a through & right-turn shared lane is always less used than the adjacent through-only lanes and as a result, operational efficiency deteriorates. To improve the efficiency fine-tuning in signal timing optimization using lane-by-lane traffic volume data is required. Further improvement can be achieved by guiding drivers to equally use the shared lane. For left-turn & U-turn shared lanes, it was found that saturation flow rate is affected by interference between U-turn and conflicting right-turn movements. However, since such interference does not occur in every cycle, a statistical model must be established to develop realistic adjustment factor for saturation flow rate of the shared lane.
A Study on Safety Impacts for VMS Traffic Information
Lee, Sang Hyuk ; Cho, Hye Jin ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 22~30
DOI : 10.12815/kits.2015.14.1.022
Recently ITS have been increasingly applied on the roads to resolve traffic problems. Especially, Variable Message Sign (VMS), which is the one of ITS for traffic management and traffic safety, can be used for providing information about road conditions, climate conditions. In this study, data acquisition and statistical analysis were conducted for estimating safety impacts of providing traffic information through VMS. As a result of analyzing traffic characteristics before and after providing traffic information through VMS, average travel speed was decreased and vehicles tended to drive on centerline of lanes in 1st and 2nd lane after providing traffic information through VMS. Also, in order to analyze safety impacts of provided VMS traffic information, traffic safety hazard zone was established in each lane and probability distributions of passing traffic on the study area was estimated through Anderson-Darling Test. As a result of this, safety impacts of VMS traffic information in 1st lane could, on average, increase in left and right side of the lane by 0.69% and 7.07%, respectively. In case of 2nd lane, safety impacts could, on average, increase in left and right side of the lane by 2.71% and 0.02%, respectively.
Analysis of Convergence Level and Exit Criteria on Traffic Assignment Algorithms
Kim, Joo-Young ; Kim, Jae-Young ; Park, Sang-Jun ; Lee, Seung-Jae ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 31~45
DOI : 10.12815/kits.2015.14.1.031
Existing link-based Frank-Wolfe algorithm has been widely used, thanks to its ease of simulation and stable results; however, it comes with low convergence issue towards near the optimum value. Such issue was not considered as a major drawback in the past. However, in the present, some arguments have occurred over the method's stability, analysis time, and other limits as the size and details of the fundamental data for traffic analysis have vastly improved. Therefore, this paper compared the theoretical attributes and the pros and cons between the Frank-Wolfe algorithm and the Origin-based algorithm and Path-based algorithm newly being developed. As a result of this paper, there is possibility that a problem of stability may arise depending on the convergence and exit criteria. Thus, In practice, this effort to derive the appropriate level of convergence is required to secure and stable results.
Drivers' Satisfaction of Protected/Permitted Left Turn(PPLT) Signal Operation
Jang, Tae-Youn ; Oh, Do-Hyoung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 46~56
DOI : 10.12815/kits.2015.14.1.046
The purpose of this study is to find out the effectiveness of drivers' satisfaction over protected and permissive left-turn (PPLT) traffic signal operation. A structural equation model was established for analyzing the effectiveness of various drivers' factors (e.g., personal characteristics, driving attitude, expectation to PPLT, etc.) on the PPLT preference based on questionnaire survey. As a result, the analysis is satisfied with the critical values, such as Q value, RMR, GIF, AGIF, and NFI. The study reveals that PPLT preference increases in case of driver who is male with long social carrier related to transportation affaire and long driving experience without traffic accident involvement. Moreover, PPLT preference increases as the expectation of PPLT to improvement of traffic safety, traffic operation, and traffic environment increases. Therefore, it is recommended that the PPLT should be preferentially operated in urban area of less traffic accidents and the promotion of PPLT be actively conducted for positive effectiveness.
A Multi-path QoS Routing Protocol for the OFDM-TDMA Mesh Networks
Choi, Jungwook ; Lee, Hyukjoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 57~67
DOI : 10.12815/kits.2015.14.1.057
A large amount of work has been done in the areas of routing, MAC, QoS, capacity, location service, cooperative communication, fault tolerance, mobility models and various applications of mesh networks thanks to their merits of cost-effective way of deployment and flexibility in extending wireline services. Although multi-path routing protocols have been proposed to be used to provide QoS and fault-tolerance, there has not been any significant results discussed that support both in the literature to our best knowledge as they are often required in military and public safety applications. In this paper, we present a novel routing protocol for a mesh network based on the OFDM-TDMA collision-free MAC that discovers and maintains multiple paths that allows retransmitting and forwarding packets that have been blocked due to a link failure using an alternative next-hop node such that the delay-capacity tradeoff is reduced and the reliability is enhanced. Simulation results show that the proposed protocol performs well in terms of both the QoS and delivery ratio.
Antenna Selection and Power Control Method for Uniform Circular Array Antennas Beamforming
Park, Seongho ; Park, Chul ; Kim, Hanna ; Chung, Jaehak ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 68~76
DOI : 10.12815/kits.2015.14.1.068
This paper proposes the antenna selection scheme and power control algorithms of multiple nodes beamforming when the vehicles equipped with circular array antennas is moving and construct mobile mesh networks. The proposed antenna selection scheme chooses beamforming antenna elements considering antenna radiation gain and allows duplicated antenna selection for multiple adjacent nodes. The proposed power control algorithms maximize SIR for the duplicated antenna selection. The simulation demonstrates that the proposed antenna selection and power control achieve 2.5dB higher SIR gain than that of conventional methods when two nodes are apart from
Development of a Fuel-Efficient Driving Method based on Slope and Length of Uphill Freeway Section
Choi, Ji-Eun ; Bae, Sang-Hoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 77~84
DOI : 10.12815/kits.2015.14.1.077
In 2011, greenhouse gas emissions of transport sector were 85.04 million
and road emissions accounted for 95% of total emissions in the transport sector. There are few innovative technologies to reduce greenhouse gas emissions aside from eco-driving education and public relation program. Therefore, this paper focused on analyzing optimal acceleration by certain road grades and suggested fuel-efficient driving method for various uphill sections. Scenarios were established by driving modes. Speed profiles were generated by scenarios and speed variations. Each speed profile applied to Comprehensive Modal Emission Model and then each fuel consumption was estimated. Driving mode and speed variation that minimized fuel consumption were driven according to grade percent and uphill distance. When driving in the eco-friendly mode of the driving and speed variation, reduction rate of fuel consumption was evaluated by comparison between eco-driving and cruise control mode. When a vehicle drove under eco-driving mode at 100kph, 90kph and 80kph on uphill road, fuel consumptions were reduced by 33.9%, 30.8% and 5.3%, respectively.
A Study on Developing Crash Prediction Model for Urban Intersections Considering Random Effects
Lee, Sang Hyuk ; Park, Min Ho ; Woo, Yong Han ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 85~93
DOI : 10.12815/kits.2015.14.1.085
Previous studies have estimated crash prediction models with the fixed effect model which assumes the fixed value of coefficients without considering characteristics of each intersections. However the fixed effect model would estimate under estimation of the standard error resulted in over estimation of t-value. In order to overcome these shortcomings, the random effect model can be used with considering heterogeneity of AADT, geometric information and unobserved factors. In this study, data collections from 89 intersections in Daejeon and estimates of crash prediction models were conducted using the random and fixed effect negative binomial regression model for comparison and analysis of two models. As a result of model estimates, AADT, speed limits, number of lanes, exclusive right turn pockets and front traffic signal were found to be significant. For comparing statistical significance of two models, the random effect model could be better statistical significance with -1537.802 of log-likelihood at convergence comparing with -1691.327 for the fixed effect model. Also likelihood ration value was computed as 0.279 for the random effect model and 0.207 for the fixed effect model. This mean that the random effect model can be improved for statistical significance of models comparing with the fixed effect model.
Effect of Passenger Car Fuel Consumptions and Fuel Cost Savings by Hi-Pass System
Kwak, Jin-Ho ; Kim, Dong-Nyong ; Jeong, Ae-Ra ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 94~102
DOI : 10.12815/kits.2015.14.1.094
The high-pass(brand name of Electronic Toll Collection System) utilization trend on the highway continues to grow as 59.4% (by the end of 2013). In this study, we applied the carbon balance method using a fuel chassis dynamometer with the four passenger car classes in order to measure the fuel consumption of the car using the expressway tollgate. We experimented 18 driving mode at general tollgate and high-pass tollgate. As a result, in case of entry/exit toll there were 21.0~56.4ml/veh fuel consumption savings, in case of open toll fuel consumption savings was analyzed as 10.5~28.1ml/veh. In addition, the annual fuel cost savings by virtue of high-pass was 28.2~57.3 billion won at 70% utilization rate, 32.2~65.5 billion won at 80%, 36.2~73.7 billion won at 90% and 40.3~81.9 billion won at 100%.
A Study on Fare Estimation for Demand Responsive Transport
Kim, Wonchul ; Namgung, Moon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 1, 2015, Pages 103~111
DOI : 10.12815/kits.2015.14.1.103
The purpose of this study is to estimate the appropriate Demand Responsive Transport (DRT) fare for bus users upon introduction of the system, which is to improve ridership on economically non-profitable routes and to conform to the mobility right of those living in presently non-serviced rural areas. For this, a stated preference (SP) survey was adopted to assess respondents' preferences regarding DRT introduction, while the contingent valuation method (CVM) was used to calculate their willingness to pay (WTP) for DRT services. The analysis results show that, compared to the existing bus services with a 1,000 won bus fare, the value of DRT is considered to be 38.85%, 31.03% and 30.12% higher in terms of overall assessment, usability and convenience, respectively. The results of this study are expected to facilitate the decision making aimed at setting the appropriate DRT fare and implementing a DRT system that meets sustainability requirements.