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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 31, Issue 6 - Dec 2013
Volume 31, Issue 5 - Oct 2013
Volume 31, Issue 4 - Aug 2013
Volume 31, Issue 3 - Jun 2013
Volume 31, Issue 2 - Apr 2013
Volume 31, Issue 1 - Feb 2013
Selecting the target year
Estimation of Design Service Traffic Volume for 2+1 Roads Based on Korean Two-Lane Highway Conditions
Lee, Dong Min ; Chae, Chan Dle ; Cho, Hanseon ; Lee, Suk Ki ;
Journal of Korean Society of Transportation, volume 31, issue 2, 2013, Pages 3~10
DOI : 10.7470/jkst.2013.31.2.003
Two-lane roads that occupy more than a half of rural highways in Korea have operational problems such as traffic congestion problems due to relatively high traffic volume and safety problems due to overtaking risks in two-lane highways. To solve these problems, a 2+1 road pattern that enables to improve traffic safety and operational efficiency of two-lane highways has been applied in Europe. In this study, in-depth applicability of 2+1 roads to Korean rural highways was investigated based on review results of the successful experience of European 2+1 roads. Then, given the Korean two-lane highway conditions, the service traffic volumes for Korean 2+1 roads was estimated. The analysis results showed that 17,000 veh./day might be the maximum traffic volumes for Korean 2+1 roads.
Analysis of Efficiencies of Korea's Domestic Airports With Radial and Non-radial Approaches
Jeon, Young In ; Min, Kyung Chang ; Ha, Hun-Koo ;
Journal of Korean Society of Transportation, volume 31, issue 2, 2013, Pages 11~19
DOI : 10.7470/jkst.2013.31.2.011
This study analyzed relative efficiencies of fourteen airports in Korea with radial and non-radial approaches such as DEA(Data Envelopment Analysis) and SBM(Slack Based Measure) from 2004 to 2011. To suggest an improvement scheme for these airports, we analyzed slack airports and compared then with respective reference airports. To measure efficiency, we used the length of runway, the number of employees, and the size of terminal as input factors, and the number of passengers, the amount of cargo, and the number of flights as output factors. The analysis results showed that efficiencies of most airports had been decreasing and that the gap between efficient airports and inefficient airports was widening. Additionally, most airports had much slacks in its terminal size. It meant that they had been operated with a size not proportionate to their demands and that it is a major cause of inefficiency.
A Study on Categorizing the Types of Transit Accessibility by Residence and Working Place and Identifying its Association to Personal Transit Travel Frequency
Sung, Hyungun ;
Journal of Korean Society of Transportation, volume 31, issue 2, 2013, Pages 20~32
DOI : 10.7470/jkst.2013.31.2.020
This study is aimed at identifying the relationship of transit accessibility types to its related travel frequency in the Seoul metropolitan area. A multi-level poisson regression model is employed after categorizing transit accessibility into 18 types based on locations of residential and work workplace. Analysis results offer three policy implications in improving transit use in the Seoul metropolitan area. First, increase in transit ridership can be more effectively attained when policies concerning both competitive and complementary relationships between bus and rail transit are incorporated. Second, transfer system needs to be focused on such two modal perspectives as one travels from Seoul to suburban area and residential areas given the fact that walking accessibility to bus transit is good but that to rail transit is poor. Third, it is more effective to emphasize rail transit priority rather than bus transit, especially for the travel from suburban area to the city of Seoul in order to increase transit ridership.
A Numerical Analysis of Land Use-Transportation Model as a Form of Analytical Tool
Yu, Sang-Gyun ; Rhee, Hyok-Joo ;
Journal of Korean Society of Transportation, volume 31, issue 2, 2013, Pages 33~44
DOI : 10.7470/jkst.2013.31.2.033
The land use-transportation models typically have complicated model structure that is good for empirical execution but bad for theoretical probe. This complexity makes it very difficult to derive the first-order conditions for system optimization in tractable forms. Yu and Rhee (2011) and Rhee (2012) show how to simplify the derivative of the model's objective function with respect to policy variables in the computable general equilibrium model of land use and transportation. However, the travel demand in their model was fixed. This drawback fundamentally limits the applicability of their methodology in the planning field. We relax this restriction. Once this is done, we can employ the methodology developed in analyzing the impacts of various types of policy instruments in the models where land market is treated endogenously and transportation network is embedded.
An Empirical Study on Comparative Analysis of Freight Demand Estimation Methods - Unimodal O/D Based Method and P/C Based Method : Focus on Korean Import/Export Container Freight
Kim, Hyunseung ; Park, Dongjoo ; Kim, Chansung ; Choi, Chang Ho ; Cho, Hanseon ;
Journal of Korean Society of Transportation, volume 31, issue 2, 2013, Pages 45~59
DOI : 10.7470/jkst.2013.31.2.045
This study deals with the comparative analysis between two freight demand estimation methods : Unimodal O/D based method and P/C based method. The data of access/egress truck trips has been omitted from the Korean freight unimodal O/D of KTDB. This is because KTDB's unimodal O/D has not marked the series of unlinked trips down as the whole freight intermodal transport and surveyed only the main-haul trips of them. For these reasons, freight intermodal transport mechanism has not been analysed perfectly with Korean unimodal O/D data. This study tries to estimate P/C table of Korean Import/Export container freight and develop the MCC(Multimodal Channel Choice) model. Then, comparing unimodal O/D based method and P/C based method in terms of the switch commodities between production point(the initial point of freight transport) and consumption point(the terminal point of freight transport), unimodal commodities, and commodities on links is conducted. The results show that the P/C based method is able to simulate the freight intermodal transport.
A Study on the Development of Plural Gravity Models and their Application Method
Ryu, Yeong-Geun ;
Journal of Korean Society of Transportation, volume 31, issue 2, 2013, Pages 60~68
DOI : 10.7470/jkst.2013.31.2.060
This study developed plural gravity models and their application method in order to increase the accuracy of trip distribution estimation. The developed method initially involves utilizing the coefficient of determination (
) to set the target level. Afterwards, the gravity model is created, and if the gravity model's coefficient of determination is satisfactory in regards to the target level, the model creation is complete and future trip distribution estimation is calculated. If the coefficient of determination is not on par with the target level, the zone pair with the largest standardized residual is removed from the model until the target level is obtained. In respect to the model, the removed zone pairs are divided into positive(+) and negative(-) sides. In each of these sides, gravity models are made until the target level is reached. If there are no more zone pairs to remove, the model making process concludes, and future trip distribution estimation is calculated. The newly developed plural gravity model and application method was adopted for 42 zone pairs as a case study. The existing method of utilizing only one gravity model exhibited a coefficient of determination value (
) of 51.3%, however, the newly developed method produced three gravity models, and exhibited a coefficient of determination value (
) of over 90%. Also, the accuracy of the future trip distribution estimation was found to be higher than the existing method.
Studies on the Methodology of a Hybrid Model for Emission Dispersion Analysis
Yang, Choong Heon ; Koo, Youn Seo ; Kim, In Su ; Sung, Jung-Gon ;
Journal of Korean Society of Transportation, volume 31, issue 2, 2013, Pages 69~79
DOI : 10.7470/jkst.2013.31.2.069
This study suggests a specific methodology to analyze how emission impacts on regional emission concentrations in accordance with the change of weather conditions, and the need of its application. The suggested methodology was applied to a transportation network of Pochun area in Gyenggido as an example. The methodology contains two types of analytical models; 1) dispersion analysis based on emission from traffic, and 2) dispersion analysis based on the combination between emission from traffic and existing emission in the air. By doing so, it is expected that the comprehensive influence of emission on traffic network and its surrounding areas can be identified. In addition, it might be useful for us to apply environmental risk assessment based on the effect of emission on the people.
Line Planning Optimization Model for Intercity Railway
Oh, Dongkyu ; Kho, Seung-Young ; Kang, Seungmo ;
Journal of Korean Society of Transportation, volume 31, issue 2, 2013, Pages 80~89
DOI : 10.7470/jkst.2013.31.2.080
The purpose of this research is to optimize the line planning of the intercity passenger railway. In this study, the line planning problem has been formulated into a mixed integer programming by minimizing both user costs (passenger's total travel time) and operator costs (operation, maintenance and vehicle costs) with multiple train types. As a solution algorithm, the branch-and-bound method is used to solve this problem. The change of travel demand, train speed and the number of schedules have been tested through sensitivity analysis. The optimal stop-schedules and frequency as well as system split with respect to each train type have been found in the case study of Kyoung-bu railway line in Korea. The model and results of this research are useful to make a decision for railway operation strategy, to analyze the efficiency of new railway systems and to evaluate the social costs of users and operators.