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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Transportation
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Journal DOI :
Korean Society of Transportation
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Volume & Issues
Volume 33, Issue 6 - Dec 2015
Volume 33, Issue 5 - Oct 2015
Volume 33, Issue 4 - Aug 2015
Volume 33, Issue 3 - Jun 2015
Volume 33, Issue 2 - Apr 2015
Volume 33, Issue 1 - Feb 2015
Selecting the target year
The Mediating Effect of Life Stress in the Relationships Between Commercial Drivers' Stress Coping Styles and Problematic Drinking Behaviors
CHUNG, Eun-Kyoung ; LEE, Suran ; KIM, Jong Dae ; SOHN, Young Woo ;
Journal of Korean Society of Transportation, volume 33, issue 6, 2015, Pages 509~519
DOI : 10.7470/jkst.2015.33.6.509
In spite of the efforts to reduce traffic accidents of commercial vehicles, the number of driving under the influence (DUI) of commercial drivers has been increasing. This study examines the effect of stress coping style of commercial drivers on driving behaviors. Specifically, this research aims to find the role of life stress as a mediator in the relationships between the stress coping style and problematic drinking behaviors. 1308 licensed commercial vehicle drivers participated in this research. Results showed that life stress mediated the relationships between problem focused strategies, wishful thinking strategies, passive avoidance strategies and problematic drinking behaviors. These findings indicate that educating drivers to change their stress coping styles would be helpful to inhibit them from being involved in drunken driving.
An Estimation of the Congestion Tolls Considering External Costs in Seoul
PARK, Chanwoon ; KIM, Sungsoo ;
Journal of Korean Society of Transportation, volume 33, issue 6, 2015, Pages 520~530
DOI : 10.7470/jkst.2015.33.6.520
This paper formulates the methodologies to estimate optimal congestion tolls from long-run and short-run perspectives and applies them to the highways of Seoul. An optimal long-run congestion toll is estimated with an optimal volume-capacity-ratio to minimize the total costs which consist of two components: road construction and maintenance costs and traveler costs. By contrast, an optimal short-run congestion toll is estimated with a supply-demand equilibrium which is determined by using a speed-flow function and a disaggregate modal choice model. The results of a long-run analysis for the Seobu urban expressway suggest the optimal volume-capacity-ratio of 1.35 and the optimal congestion toll of 503 Won per automobile kilometer. By contrast, those of a short-run analysis for the Mia-ro urban arterial suggest 1.31 and 420 Won, respectively. Although our results are to some degree dependent on the interest rate and time value assumed, one basic conclusion holds up: the congestions toll tested could generate substantial gains in social welfare if applied to Seoul.
Reviews on the Conflicts Among Interest Groups in the Process of Railway Restructuring: Focusing on the ACF(Advocacy Coalition Framework)
LEE, Hyun-Jung ; KIM, Jae-Young ;
Journal of Korean Society of Transportation, volume 33, issue 6, 2015, Pages 531~542
DOI : 10.7470/jkst.2015.33.6.531
The discussion about the structural reformation of Korean rail industry has been consistently conducted from the evaluation on Korean National Railroad's management in 1998, the foundation of KORAIL in 2005 to the approval of Suseo KTX corporation establishment in 2013 and the controversy over its privatization. This research explores the changes of government policies by applying to ACF in the assumption that those changes have been implemented due to the interaction of various external variables and main agents in policy which had existed for a long-term period that the rail industry's structural reformation has been practiced for more than 10 years. The unions failed to reach an agreement for the rail industry's structural reformation, the policies regarding the reformation have been led by superior political unions. And this research concludes that a mediator who can compromise unions' different policy preferences and means and bring up a compromised decision in conflicted situation plays a pivotal role to successfully practice these policies.
The Impact of the Bus Use Environments on Users Stress: The Case of Daejeon City
LEE, Jaeyeong ; PARK, Jin Hee ;
Journal of Korean Society of Transportation, volume 33, issue 6, 2015, Pages 543~553
DOI : 10.7470/jkst.2015.33.6.543
This study analyzed that the impact of the bus use environment on users' stress in each step of bus use, from accessing to leaving to transfer, in the city of Daejeon. For this, we collected the stress data from 300 users using personal interviews at the bus stops and on-board bus. Also, we used factor analysis and structural equation model method for analysis of the impact of external and internal bus environments on stress of users. The results of this study showed that the highest stress impact factor was an onboard factor(
) including 'density and crowding', 'no seat to seat' and 'low ride comfort and safe'. The next stress impact factor was transfer factor including 'insufficient transfer information', 'lack of connectivity of bus and subway' and 'uncomfort transfer route'. From the above, we recommend that bus policies need to focus on not the supplier but users and also, this user based policy need to be more specified considering the characteristics of various users such as females, the elderly, irregular users, and so on.
Developing an Accident Model for Rural Signalized Intersections Using a Random Parameter Negative Binomial Method
PARK, Min Ho ; LEE, Dongmin ;
Journal of Korean Society of Transportation, volume 33, issue 6, 2015, Pages 554~563
DOI : 10.7470/jkst.2015.33.6.554
This study dealt with developing an accident model for rural signalized intersections with random parameter negative binomial method. The limitation of previous count models(especially, Poisson/Negative Binomial model) is not to explain the integrated variations in terms of time and the distinctive characters a specific point/segment has. This drawback of the traditional count models results in the underestimation of the standard error(t-value inflation) of the derived coefficient and finally affects the low-reliability of the whole model. To solve this problem, this study improves the limitation of traditional count models by suggesting the use of random parameter which takes account of heterogeneity of each point/segment. Through the analyses, it was found that the increase of traffic flow and pedestrian facilities on minor streets had positive effects on the increase of traffic accidents. Left turning lanes and median on major streets reduced the number of accidents. The analysis results show that the random parameter modeling is an effective method for investigating the influence on traffic accident from road geometries. However, this study could not analyze the effects of sequential changes of driving conditions including geometries and safety facilities.
Analysis of Acceleration and Deceleration on High Performance Train for A Metropolitan Rapid Transit System
KO, Kyeong Jun ; KIM, Jung Tai ; KIM, Moo Sun ; JANG, Dong Uk ; HONG, Jae Sung ; RYU, Sang Hwan ; JUNG, Jong Deok ;
Journal of Korean Society of Transportation, volume 33, issue 6, 2015, Pages 564~574
DOI : 10.7470/jkst.2015.33.6.564
As shown by the popularity of the rapid train in the Seoul Metro Line No. 9, the demand for the rapidization of the metro transit has been continuously increased. However, it needs tremendous cost to construct new additional infrastructures to the existing line for the rapidization. In order to overcome the problem, utilizing the existing infrastructures such as crossing tracks as railroad sidetracks can be considered to be a good method of reducing the cost. In this case, there is a way exploiting the existing train as an express train and the advanced train, which increases both acceleration and deceleration, as a local train, but achievable acceleration and deceleration have not been analyzed rigorously. In this paper, we analyze feasible ranges and optimal values of both acceleration and deceleration of the advanced train analytically when we consider the rapidization of the metro transit utilizing the existing infrastructures and verify the results in Seoul Metro Line No. 3. Simulation results show ranges and optimal values of achievable acceleration and deceleration exist when minimum gap between an express train and a local train is smaller than 40 seconds.
Estimating O-D Trips Between Sub-divided Smaller Zones Within a Traffic Analysis Zone
KIM, Jung In ; KIM, Ikki ;
Journal of Korean Society of Transportation, volume 33, issue 6, 2015, Pages 575~583
DOI : 10.7470/jkst.2015.33.6.575
The Korea Transport Institute (KOTI) builds the origin and destination(O-D) trip data with relatively smaller zone size such as Eup, Myeon, Dong administration unit districts in metropolitan area. Otherwise, O-D trip data was built by bigger size of traffic analysis zone(TAZ) such as Si, Gun, Gu administration unit districts for rural area. In some cases, it is needed to divide a zone into several sub-zones for rural area in order to analyze travel distribution pattern in detail for a certain highway and rail project. The study suggested a method to estimate O-D trips for sub-zones in the larger-size zones in rural area. Two different distribution models, direct demand model and gravity model, were calibrated for sub-zone's intra-zonal O-D trip pattern with metropolitan area O-D data which has smaller zone-size (sub-zone) data categorized by low, middle and high population density. The calibration results were compared between the two models. The gravity model with impedance function of power functional form was selected with better explanation for all groups in the metropolitan area. The adjusted
was 0.7426, 0.6456 and 0.7194 for low, middle and high population density group, respectively. The suggested O-D trip estimating method is expected to produce enhanced trip patterns with sub-divided small zones.
Determination of Key Factors for the Pedestrian LOS Introducing the Accessibility Index
CHOI, Sung Taek ; CHOO, Sang Ho ; JANG, Jin Young ;
Journal of Korean Society of Transportation, volume 33, issue 6, 2015, Pages 584~597
DOI : 10.7470/jkst.2015.33.6.584
A considerable amount of literature has been published on pedestrian LOS. So far, however, there is a limitation that LOS analysis methodologies has concentrated on quantitative variables such as pedestrian flow rate, speed and space. This paper intended to suggest the accessibility variable which can not be considered on previous study. The factor was defined and quantified using public transport attributes in particular. This study was carried out in three phases: 1. defined accessibility employing public mode location and service information. 2. investigated the relationship between accessibility and pedestrian flow rate 3. developed the model to establish the factors affected to pedestrian LOS. The results showed that accessibility, walkway attribute and land use type affected the pedestrian LOS. Especially, accessibility and commercial area ratio had negative relationship with LOS. Futhermore, pedestrian LOS declined when obstacle of bus station located on the walkway. On the contrary, LOS was upgraded when sufficient effective width or residential area was secured. These results can receive considerable critical attentions related to determination of pedestrian LOS or effective walkway width.