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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 32, Issue 6 - Dec 2014
Volume 32, Issue 5 - Oct 2014
Volume 32, Issue 4 - Aug 2014
Volume 32, Issue 3 - Jun 2014
Volume 32, Issue 2 - Apr 2014
Volume 32, Issue 1 - Feb 2014
Selecting the target year
Analyzing the Relationship Between Precipitation and Transit Ridership Through a Seemingly Unrelated Regression Model
Shin, Kangwon ; Choi, Keechoo ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 83~92
DOI : 10.7470/jkst.2014.32.2.083
Weather condition is one of the crucial factors affecting travelers' mode choice. Nevertheless, there are numerous indefinite traffic phenomena under various weather conditions. This study was conducted to verify the hypothesis that transit riderships decrease as precipitation increases. To clarify the relationship between precipitation and transit ridership, a seemingly unrelated regression model was employed with data such as daily precipitation and daily transit riderships of 3 transit modes (bus, metro, and shuttle bus) collected in Busan for recent 24 months. The estimation results show that transit riderships decreased as the daily precipitation increased when the daily precipitation is greater or equal to 10mm/day (0.169%, 0.101%, and 0.172% reduction in bus, metro, and shuttle bus riderships, respectively, when the daily precipitation increased by 1mm). When comparing the impact of precipitation on transit riderships by modes using a cross-equation parameter restriction test, the decrease in metro ridership is relatively insensitive to the change in precipitation. However, the negative coefficient of precipitation in the metro ridership estimation model indicates that the transit users in Busan may alter their mode to taxi or automobile and/or may give up the trip itself in bad weather condition.
Efficiency Evaluation of Mobile Emission Reduction Countermeasures Using Data Envelopment Analysis Approach
Park, Kwan Hwee ; Lee, Kyu Jin ; Choi, Keechoo ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 93~105
DOI : 10.7470/jkst.2014.32.2.093
This study evaluated the relative efficiency of mobile emission reduction countermeasures through a Data Envelopment Analysis (DEA) approach and determined the priority of countermeasures based on the efficiency. Ten countermeasures currently applied for reducing greenhouse gases and air pollution materials were selected to make a scenario for evaluation. The reduction volumes of four air pollution materials(CO, HC, NOX, PM) and three greenhouse gases(
) for the year 2027, which is the last target year, were calculated by utilizing both a travel demand forecasting model and variable composite emission factors with respect to future travel patterns. To estimate the relative effectiveness of reduction countermeasures, this study performed a super-efficiency analysis among the Data Envelopment Analysis models. It was found that expanding the participation in self car-free day program was the most superior reduction measurement with 1.879 efficiency points, followed by expansion of exclusive bus lanes and promotion of CNG hybrid bus diffusion. The results of this study do not represent the absolute data for prioritizing reduction countermeasures for mobile greenhouse gases and air pollution materials. However, in terms of presenting the direction for establishing reduction countermeasures, this study may contribute to policy selection for mobile emission reduction measures and the establishment of systematic mid- and long-term reduction measures.
Methodology for Evaluating Effectiveness of In-vehicle Pedestrian Warning Systems Using a Driving Simulator
Jang, Ji Yong ; Oh, Cheol ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 106~118
DOI : 10.7470/jkst.2014.32.2.106
The objective of this study is to develop a methodology for evaluating the effectiveness of in-vehicle pedestrian warning systems. Driving Simulator-based experiments were conducted to collect data to represent driver's responsive behavior. The braking frequency, lane change duration, and collision speed were used as measure of effectiveness (MOE) to evaluate the effectiveness. Collision speed data obtained from the simulation experiments were further used to predict pedestrian injury severity. Results demonstrated the effectiveness of warning information systems by reducing the pedestrian injury severity. It is expected that the proposed evaluation methodology and outcomes will be useful in developing various vehicular technologies and relevant policies to enhance pedestrian safety.
Traffic Accident Reduction Effects of Section Speed Enforcement Systems(SSES) Operation in Freeways
Jung, Yong Il ; Beak, Tae Hun ; Kim, Yoon Hwan ; Park, Byung Ho ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 119~129
DOI : 10.7470/jkst.2014.32.2.119
This study aims to evaluate the accident reduction effects of 'Section Speed Enforcement System' (SSES) operation in freeways. In pursuing the above, this study collects the accident data for 5 years (2 years before operation and 3 years after operation) at all 9 sections where SSESs are operated, and evaluates annually the effects before and after operation using the comparison group method (C.G. Method). The measures of effectiveness are total accidents (TAs), fatal and serious accidents (FSAs), total injuries (TIs) and fatal and serious injuries (FSIs). The main results are as follows. First, TAs and TIs are reduced to 41.7 and 17.1%, respectively. Second, FSAs and FSIs are reduced to 41.7 and 32.2%, respectively. Therefore, SSES has more effectiveness at fatal and serious accident. Third, the accident reduction effect has been increasing, and particularly the effect of 'after three years' is evaluated to be notable.
Weights of Attributes in Creating Transit Malls
Park, Jong-Il ; Chang, Justin S. ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 130~138
DOI : 10.7470/jkst.2014.32.2.130
This paper assessed the weights of attributes in creating transit malls. The aim of the creation was classified as travel demand management and urban revitalization. The attributes were grouped into four aspects, or 4As: attraction, amenity, accessibility, and activity. These dimensions represented land-use, urban design, transport, and socio-cultural characteristics, respectively. The analytical hierarchy process was applied to explore the weights. Accessibility(52.7%), attraction(25.6%), amenity(13.7%), and activity(8.0%) were the order of magnitude in weights for the purpose of travel demand management, while attraction(36.1%), accessibility(30.6%), amenity(17.7%), and activity(15.6%) were that of urban revitalization. The multi criteria analysis also showed different size of weights in the sub planning attributes. These results indicate that the aimin implementingtransit malls should be differentiated and highlight that the combined land-use and transport plan is essential for the successful development. Car accessibility and socio-cultural characteristics are also understood as the important factors.
Analysis of Factors Affecting Rail Transit Ridership at Urban Rail Stations
Lee, Chan Hwi ; Yun, Dae Sic ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 139~151
DOI : 10.7470/jkst.2014.32.2.139
This paper analyzes factors affecting rail transit ridership at urban rail stations of the Daegu Metropolitan City in 2011. Rail transit ridership is analyzed by dividing weekdays and weekends in order that their differences may be observed. The data used in this study includes various explanatory variables, such as floor area which was collected from building ledger and GIS cadastral map, number of bus routes(line) possible to transfer from urban rail transit, number of students enrolled in middle and high schools, and universities located in access areas of rail transit. For this study, multiple regression models are estimated including various explanatory variables affecting rail transit ridership of weekdays and weekends. From the study, the number of statistically significant explanatory variables and the relative effect of each variable are shown to be different between weekdays and weekends.
An Empirical Model for Estimating Bus Boarding and Alighting Time
Seong, Myeong Eon ; Choi, Keechoo ; Shin, Kangwon ; Chung, Woohyun ; Lee, Kyu Jin ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 152~161
DOI : 10.7470/jkst.2014.32.2.152
The total boarding and alighting time models have been developed by applying the multiple regression analysis with three variables; numbers of boarding or alighting passengers, non-sitting passengers, and the step-height from the ground. Such variables have influenced to the total boarding time model with the most influential in the numbers of boarding or alighting passengers and the least in the step-height. On the total alighting time model, the numbers of alighting passengers are the most strongest while the step-heights the least. The total boarding and alighting time models can be used in practices for the prediction of current and future bus stops' capacities in TOD-based towns.
Analyzing Airport Network Characteristics Applied to the Structural Equivalence
Oh, Sung Yeoul ; Park, Yonghwa ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 162~169
DOI : 10.7470/jkst.2014.32.2.162
This study dealt with the airport network applying the Structural Equivalence which has used in the field of social science network. It analyzed the size of aviation market and trade exchanges. The results between blocks through the Convergence of Iteration Correlation are as follows; Block 1 (major hub airport) and Block 5 (Australian and New Zealand airports) have a strong relationship between other blocks. Block 3 (CIS region) and Block 7 (Malaysia and Indonesia) have been indicated as relatively low degree. The structural equivalence analysis can be grouped as a small number of blocks with large and complex networks and also presented a significant result according to the nature of the relationship between aviation market and the level of trade exchanges.
Relationship Between Accidents and Non-Homogeneous Geometrics: Main Line Sections on Interstates
Park, Min Ho ; Noh, Kwan Sub ; Kim, Jongmin ;
Journal of Korean Society of Transportation, volume 32, issue 2, 2014, Pages 170~178
DOI : 10.7470/jkst.2014.32.2.170
Until now, several research on the relationship of traffic crash occurrences and geometric had been conducted and revealed that projects of road alignment, geometric improvement and hazardous segment selection reduced the number of accidents and accident severities. However, such variables did not consider the non-homogeneous characteristics of roadway segments due to the difficulty of data collection, which results in under-estimation of the standard error affecting the overall modeling goodness-of-fit. This study highlights the importance of non-homogeneity by looking at the effect of the non-homogeneous geometric variables through the modeling process. The model delivers meaningful results when using some geometric variables without relevant geometrics' variables.