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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
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Journal DOI :
The Korea Institute of Inteligent Transport Systems
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Volume & Issues
Volume 9, Issue 6 - Dec 2010
Volume 9, Issue 5 - Oct 2010
Volume 9, Issue 4 - Aug 2010
Volume 9, Issue 3 - Jun 2010
Volume 9, Issue 2 - Apr 2010
Volume 9, Issue 1 - Feb 2010
Selecting the target year
Classification of Traffic Information Announcement Considering Cognitive Characteristics for Traffic Situations
Hwang, Seong-Min ; Lee, Byung-Joo ; Suh, Seung-Hwan ; Sung, Soo-Lyeon ; NamGung, Moon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 1~11
Traffic broadcasting is using a usual traffic information announcement when giving its information to users on the road and for the provision of information useful to drivers, a clear criteria of how to judge with information from informers needs to be established from the perspective of users. In this study, to give some available criteria for current announcement which often causes confusion, cognitive characteristics were investigated and analyzed based on judgment criteria which are commonly felt by correspondents, participants in traffic broadcasting and drivers. The result requires the provision of information that is relied on an average speed where drivers feel little cognitive difference and found a classification where a smooth traffic flow is more than 60km/h, going slow 40~60km/h and congested state less than 40km/h respectively. And from the study of 35 traffic information announcement for different traffic situations, 8 cases of smooth state and 9 cases of congested state were clearly classified but the rest 18 cases of comment were ambiguously perceived by drivers and which requires the necessity of a announcement that uses directly the word of 'smooth', 'slow', and 'congestion' in the actual expression of slow driving. The future study should be focused on the establishment of more definite criteria by representation of nearly real traffic flow, provision of traffic information announcement and the analysis of cognitive response through car dynamic simulators and the kinds.
A Shortest Path Algorithm Considering Directional Delays at Signalized Intersection
Min, Keun-Hong ; Jo, Mi-Jeong ; Kho, Seung-Young ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 12~19
In road network, especially in urban area, inefficiency of travel time is caused by signal control and turn maneuver at intersection and this inefficiency has substantial effects on travel time. When searching for the shortest path, this inefficiency which is caused by turn maneuver must be considered. Therefore, travel time, vehicle volume and delay for each link were calculated by using simulation package, PARAMICS V5.2 for adaptation of turn penalty at 16 intersections of Gangnam-gu. Turn penalty was calculated respectively for each intersection. Within the same intersection, turn penalty differs by each approaching road and turn direction so the delay was calculated for each approaching road and turn direction. Shortest path dealing with 16 intersections searched by Dijkstra algorithm using travel time as cost, considering random turn penalty, and algorithm considering calculated turn penalty was compared and analyzed. The result shows that by considering turn penalty searching the shortest path can decrease the travel time can be decreased. Also, searching the shortest path which considers turn penalty can represent reality appropriately and the shortest path considering turn penalty can be utilized as an alternative.
A Study on Driver's Psychological Responses to VMS Traffic Information Using Driving Simulator
Lim, Joon-Bum ; Hong, Ji-Yeon ; Lee, Soo-Beom ; Jung, Sung-Hwa ; Hwang, Jung-Rae ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 20~29
The variable message sign(VMS) is a representative traffic information service medium which has the largest users and is provided and operated by a governmental agency. In this paper, we focused on psychological responses of individuals who use VMS traffic information in the light of the need for VMS to provide user-oriented service. A total of t재 scenarios were plotted to conduct our experiment on a virtual test track. A stress index analysis on VMS location, the first scenario, showed the lowest stress value at the point of 1.5 kilometers before the exit. A stress index analysis on the contents of VMS information (communication, time, and speed), the second scenario, showed the lowest stress value at time information.
Traffic Analysis Model for Exit Ramp Congestion at Urban Freeway
Jeon, Jae-Hyeon ; Kim, Young-Chan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 30~40
The freeway congestion is largely generated by a mainline spillover of the exit ramp queue. So it is necessary to study for modeling of the phenomenon and applying the model. In this study, the authors evaluated applicability of the Supply-Demand model, which can express traffic flow for the freeway by applying flexibly supply and demand curves for capacity of the freeway. First the authors proposed methods processing input data required in the Supply-Demand model, such as sending & receiving functions and time-varying capacity constraints for the freeway mainline. After modeling the Supply-Demand application model, the authors applied the model to the site including congested Hongeun exit ramp in Seoul Ring-road, and improved the model by adjusting application techniques and calibrating parameters. The result of the analysis showed that the Supply-Demand model yielded a queuing pattern and queue location similar to them observed in the field data, and applicability of the Supply-Demand model was varified.
Analysis of Influencing Factors of Traveler Detour Making Behavior for Providing Freeway VMS Information
Choi, Jai-Sung ; Sung, Hyun-Jin ; Kim, Sang-Youp ; Park, Jun ; Kang, Weon-Eui ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 41~50
This paper presents an investigation result that is made to determine dominant influencing factors and their specific impacts on motorist detour makings for VMS placements on freeway. This was necessary to provide engineers with a tool for evaluating VMS cost-effectiveness and its feasibility. This research found that additional travel time delay is the most influential variable in determining motorist detour makings. Also, more than 70% freeway motorists recognize the adjacent national roads as their detour routes, and both AADT and the distance to the entering point of the detour path are found to be dominating factors. Motorist detour ratio model by VMS placement on freeway is developed based on the Stated Preference. In model validation, actual detour making behaviors observed by the Revealed Preference values verify the detour ratio on the Stated Preference. These research findings should be useful for cost-effective placements of VMS on freeway, and it is recommended that the results be tested by practicing engineers in the ITS sector.
Performance of Spectrum Sensing for Cognitive Radio Systems with ITS Applications
Lee, So-Young ; Kim, Eun-Cheol ; Kim, Jin-Young ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 51~58
According to dramatic increase of wireless communication demand, more spectrum resources are needed to support considerable and various wireless services, so cognitive radio(CR) was proposed to reuse unused frequency efficiently. Also, FCC revises its policies regarding the usage of the TV white spaces by unlicensed users. CR is an intelligent wireless communication system that is aware of the radio environment and is capable of adapting its operation to the statistical variations. Spectrum sensing is the key task of the CR systems. However, since spectrum sensing performance changes according to the received signal that is received various geography environment, regional characteristics are considered to estimate the path-loss. Therefore, for more accurate analysis and simulation, we demonstrate the spectrum sensing performance of CR system by various method applying Okumura-hata propagation model.
Evaluation on the Fuel Efficiency of Hi-Pass System
Lee, Seong-Kwan Mark ; Lee, Ki-Young ; Choi, Yoon-Hwan ; Kwak, Jin-Ho ; Sung, Ji-Na ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 59~66
Around a toll plaza, vehicles do such maneuvers as slow down, stop, and speed up to pay their tolls when they use ordinary toll gates. They can be expected more fuel consumptions compared to the vehicles which use the Hi-pass, a Korean type of Electronic Toll Collection System(ETCS). To measure the exact amount of difference between the two gas consumptions, we equipped a test vehicle with a measurement system and constructed a model toll gate on our test field. Through the field tests on fuel consumptions, we could confirm a 36.7 % of energy saving when the test car used the Hi-pass. Then we projected the result on the total traffic volumes which had used national expressway network for five months from January 2009. Projected to the whole traffic, potential cost savings reached 5.34 billion won. We expect this result be frequently mentioned of to prove the fuel efficiency of the Hi-pass system.
Driver Verification System Using Biometrical GMM Supervector Kernel
Kim, Hyoung-Gook ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 67~72
This paper presents biometrical driver verification system in car experiment through analysis of speech, and face information. We have used Mel-scale Frequency Cesptral Coefficients (MFCCs) for speaker verification using speech information. For face verification, face region is detected by AdaBoost algorithm and dimension-reduced feature vector is extracted by using principal component analysis only from face region. In this paper, we apply the extracted speech- and face feature vectors to an SVM kernel with Gaussian Mixture Models(GMM) supervector. The experimental results of the proposed approach show a clear improvement compared to a simple GMM or SVM approach.
Extraction of Hazardous Freeway Sections Using GPS-Based Probe Vehicle Speed Data
Park, Jae-Hong ; Oh, Cheol ; Kim, Tae-Hyung ; Joo, Shin-Hye ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 73~84
This study presents a novel method to identify hazardous segments of freeway using global positioning system(GPS) based probe vehicle data. A variety of candidate contributing factors leading to higher potential of accident occurrence were extracted from the probe vehicle dataset. The research problem was defined as a classification problem, then a well-known classifier, bayesian neural network was adopted to solve the problem. A binary logistic regression technique was also used for selecting salient input variables. Test results showed that the proposed method is promising in extracting hazardous freeway sections. The outcome of this study will be effectively used for evaluating the safety of freeway sections and deriving countermeasures to prevent accidents.
A Dynamic Hardware Allocation and Binding Algorithm for SOC Design Automation
Eom, Kyung-Min ; Lin, Chi-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 9, issue 3, 2010, Pages 85~93
This paper proposes a new dynamic hardware allocation and binding algorithm of a simultaneous allocation and binding for SOC design automation. The proposed algorithm works on scheduled input graph and simultaneously allocates binds functional units, interconnections and registers by considering interdependency between operations and storage elements in each control step, in order to share registers and interconnections connected to functional units, as much as possible. This paper shows the effectiveness of the proposed algorithm by comparing experiments to determine number of function unit in advance or by comparing separated executing allocation and binding of existing system.