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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
Methodology for Evaluating the Effectiveness of Integrated Advanced Driver Assistant Systems
Jeong, Eunbi ; Oh, Cheol ; Jung, Soyoung ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 293~302
DOI : 10.7470/jkst.2014.32.4.293
Recently, advanced sensors and communication technologies have been widely applied to advanced safety vehicles for reducing traffic accidents and injury severity. To apply the advanced safety vehicle technologies, it is important to quantify safety benefits, which is a fundamental for justifying application. This study proposed a methodology for quantifying the effectiveness of the Advanced Driver Assistant System (ADAS) with the Analytic Hierarchy Process (AHP). When the proposed methodology is applied to 2008-2010 Gyeonggi-province crash data, ADAS would reduce about 10.18% of crashes. In addition, Adaptive Cruise Control, Automatic Emergency Braking System, Lane Departure Warning System and Blind Spot Detection System are expected to reduce about 10.43%, 10.17%, 9.96%, and 10.18%, respectively. The outcomes of this study might support decision making for developing not only vehicular technologies but also relevant safety policies.
A Methodology for CO
Emissions Estimation with Through-Traffic
Kim, Tea Gyun ; Hong, Ki Man ; Baek, Ba Ruem ; Woo, Wang Hee ; Hong, Young Suk ; Cho, Joong Rae ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 303~314
DOI : 10.7470/jkst.2014.32.4.303
This study develops a
emissions estimation method, which considers different O/D travel patterns and through traffic volumes, in different regions for
emissions management in the field of transportation. In the research, O/D and network data provided by the Korea Transport Database (KTDB) Center are used as basic data. The results show that the total emission was similar to the Metropolitan's total emission which was estimated by KTDB (2009). With the analysis focusing on Gyeonggi-do, the results show that
emission from through traffic volumes was greater than
emissions of the Intra-Regional in southern regions; By contrast,
emissions of the Intra-Regional was greater than that from through traffic volumes in northern regions. Therefore, the
emissions management needs to be segregated into local government and nation with each travel pattern.
Analyzing Pedestrian Characteristics Using the Seoul Floating Population Survey: Focusing on 5 Urban Communities in Seoul
Lee, Hyang Sook ; Kim, Ji Yoon ; Choo, Sang Ho ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 315~326
DOI : 10.7470/jkst.2014.32.4.315
This paper analyzes and compares the pedestrian characteristics of 5 urban communities with 2012 Seoul floating population survey data. First of all, differences in total pedestrian volumes and time distribution of the volumes are compared across the 5 urban communities and the effects of pedestrian road properties are investigated. Then, we conduct a regression analysis to find factors influencing pedestrian volume according to the type of urban community and day of week. As results, the urban community had the greatest volume and the volume increased significantly at lunch time. Center bus lane, bus stop, and crosswalk lead to more trips in the urban community, while opposite patterns occurred in the other communities. Less slopes and commercial region areas caused more trips in all communities. Regression analysis results showed that a variety of variables including demographic indices, land use type and pedestrian road properties differently affect pedestrian volumes in individual urban communities. The research can be used as basic data to establish polices for pedestrian environment improvement.
Development of Evaluation Factors for Selecting Operator of Rail Traffic-Control
Oh, Jae Kyoung ; Chung, Sung Bong ; Kim, Ji Yeon ; Kim, Sigon ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 327~335
DOI : 10.7470/jkst.2014.32.4.327
The Korean government, as of last year, is attempting to introduce a competitive system in the rail-market. However there are some pertinent issues which need to be addressed in order to select the best possible organization for optimum railway traffic control. As there are no standard guidelines in selecting an agency, objective evaluation factors need to be properly applied to ensure the best possible decision is made. Through literature review and various interviews with experts, appropriate criteria were selected to evaluate the suitability of each potential operator. As generally mentioned, both safety and efficiency play vital roles in the selection process but in addition, there are other factors such as security and fairness, which also need to be considered. The individual weight of these factors were calculated by the AHP, in which three groups of experts were interviewed to acquire their expertise. According to the results, as a potential operator, the score of a railway operating company and the management cooperation of railway is 2.75 and 3.85, respectively. In the future, in preparation towards becoming a competitive rail-market, this research is expected to assist in choosing the best party to control the rail traffic system.
Efficiency Plan of Transportation Investment Appraisal System
Chung, Sung Bong ; Namkung, Baek Kyu ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 336~346
DOI : 10.7470/jkst.2014.32.4.336
Recently interest and concern about the effectiveness of the transportation investment policy have been increasing because lots of transportation projects reflected to the National Transportation Plan are suspended or delayed during pre-feasibility study. For instance, the criticism such as overlap and deficiency in consistency in appraisal system were aroused because of the waste of budget, time and man-power etc. This is because the Korea government adopted pre-feasibility study for the purpose of efficient use of national budget, but the methodology and the appraisal contents are similar to the existing feasibility study. Also, the feasibility appraisal study was adopted in 1999 for the purpose of establishing efficient transport networks but the feasibility study has been substituting the function which should be conducted by feasibility-appraisal study. In this study, by reviewing the current situation and the purport of introducing these policies, the understanding of these policies could be increased. Then, the plans for improving the efficiency of transportation appraisal system are suggested in the context of strengthening the connectivity between these policies. This study is expected to play an important role in increasing the rationality, consistency and efficiency of transportation investment policies.
Analysis on Passenger Car Travel Characteristics by Household Type
Joo, Jin Ho ; Yeon, Ji Youn ; Jang, Dong Ik ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 347~356
DOI : 10.7470/jkst.2014.32.4.347
Passenger cars occupy about 74% among registered vehicles in Korea and the ratio of transportation mode sharing is approximately 60% in the passenger transport part. However, there is no statistics related to travel characteristics of passenger cars, and official statistics are estimated from O/D travel data. Thus, National Transportation DataBase Center in KOTI has attempted to construct various statistical data through Korea Vehicle Use Survey. Based on these data, Analysis of Variance (ANOVA) was conducted to investigate the differences in travel characteristics of each analysis group. As a result, all of the explanatory variables(weekday vs. weekend, metropolitan area vs. non-metropolitan area, male vs. female, commute time vs. other time, routine purpose vs. non-routine purpose) were found to be different across households. In addition, travel distances per trip of weekday, metropolitan area, male, commute time, and non-routine purpose are longer than the opposite variables. Also, the trip distances of small size(1 to 2 persons) households are shorter compared to large size(more than 5 persons) households.
Analysis of Congestion Tolls Using the Land Use-Transportation Model When Toll Revenues Are Recycled
Rhee, Hyok-Joo ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 357~368
DOI : 10.7470/jkst.2014.32.4.357
So far, land use-transportation models have been used exclusively for numerical analysis. A recent theoretical endeavor now enables us to derive the first-order derivative of the model's welfare function with respect to policy variables. I extend this methodology into the institutional setting where toll revenues are recycled through labor income tax. In this setting, the first-order derivative is composed of (1) the increase in welfare due to reduced congestion, and (2) the decrease in welfare due to interaction with the existing labor income tax. This result coincides with existing theory in the non-spatial model.
A Crash Prediction Model for Expressways Using Genetic Programming
Kwak, Ho-Chan ; Kim, Dong-Kyu ; Kho, Seung-Young ; Lee, Chungwon ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 369~379
DOI : 10.7470/jkst.2014.32.4.369
The Statistical regression model has been used to construct crash prediction models, despite its limitations in assuming data distribution and functional form. In response to the limitations associated with the statistical regression models, a few studies based on non-parametric methods such as neural networks have been proposed to develop crash prediction models. However, these models have a major limitation in that they work as black boxes, and therefore cannot be directly used to identify the relationships between crash frequency and crash factors. A genetic programming model can find a solution to a problem without any specified assumptions and remove the black box effect. Hence, this paper investigates the application of the genetic programming technique to develope the crash prediction model. The data collected from the Gyeongbu expressway during the past three years (2010-2012), were separated into straight and curve sections. The random forest technique was applied to select the important variables that affect crash occurrence. The genetic programming model was developed based on the variables that were selected by the random forest. To test the goodness of fit of the genetic programming model, the RMSE of each model was compared to that of the negative binomial regression model. The test results indicate that the goodness of fit of the genetic programming models is superior to that of the negative binomial models.
A Study on Performance Evaluation of Various Kriging Models for Estimating AADT
Ha, Jung Ah ; Oh, Sei-Chang ; Heo, Tae-Young ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 380~388
DOI : 10.7470/jkst.2014.32.4.380
Annual average daily traffic(AADT) serves as important basic data in the transportation sector. AADT is used as design traffic which is the basic traffic volume in transportation planning. Despite of its importance, at most locations, AADT is estimated using short term traffic counts. An accurate AADT is calculated through permanent traffic counts at limited locations. This study dealt with estimating AADT using various models considering both the spatial correlation and time series data. Kriging models which are commonly used spatial statistics methods were applied and compared with each model. Additionally the External Universal kriging model, which includes explanatory variables, was used to assure accuracy of AADT estimation. For evaluation of various kriging methods, AADT estimation error, proposed using national highway permanent traffic count data, was analyzed and their performances were compared. The result shows the accuracy enhancement of the AADT estimation.
How to Increase the Usability of a Subway Commuter Pass Using Nested Logit Model
Jung, Hun Young ; Shin, Jong Jin ; Ko, Sang Seon ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 389~400
DOI : 10.7470/jkst.2014.32.4.389
This study finds a way to increase the usability of a subway commuter pass. Usability of the commuter pass on a probabilistic statistical model is calculated when the pass is allowed to used in a different mode(bus). A sunk cost of commuter pass is used to reduce the vehicle travels from public transit. 324 people aged 25 to 35 were surveyed and utilized to build a Nested Logit Model on STRADA 3.5 platform. Main results are as follows. First, commuter passes were issued in various forms. Second, the model turns out to be statistically significant in four explanatory variables (discount rate, inter-usablity between modes, forms of payment and periods). Lastly, the more valid on different modes, the more increased of the rail commuter pass.
Air Passenger Demand Forecasting and Baggage Carousel Expansion: Application to Incheon International Airport
Yoon, Sung Wook ; Jeong, Suk Jae ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 401~409
DOI : 10.7470/jkst.2014.32.4.401
This study deals with capacity expansion planning of airport infrastructure in view of economic validation that reflect construction costs and social benefits according to the reduction of passengers' delay time. We first forecast the airport peak-demand which has a seasonal and cyclical feature with ARIMA model that has been one of the most widely used linear models in time series forecasting. A discrete event simulation model is built for estimating actual delay time of passengers that consider the passenger's dynamic flow within airport infrastructure after arriving at the airport. With the trade-off relationship between cost and benefit, we determine an economic quantity of conveyor that will be expanded. Through the experiment performed with the case study of Incheon international airport, we demonstrate that our approach can be an effective method to solve the airport expansion problem with seasonal passenger arrival and dynamic operational aspects in airport infrastructure.
Signal Timing and Intersection Waiting Time Calculation Model using Analytical Method for Active Tram Signal Priority
Jeong, Youngje ; Jeong, Jun Ha ; Joo, Doo Hwan ; Lee, Ho Won ; Heo, Nak Won ;
Journal of Korean Society of Transportation, volume 32, issue 4, 2014, Pages 410~420
DOI : 10.7470/jkst.2014.32.4.410
This research suggests a new tram signal priority model which determines signal timings and tram intersection waiting time using analytical method. This model can calculate the signal timings for Early Green and Green Extension among the active tram signal priority techniques by tram detection time of upstream detector. Moreover, it can determine the tram intersection waiting time that means tram intersection travel time delay from a vantage point of tram travel. Under the active tram signal priority condition, priority phases can bring additional green time from variable green time of non-priority phases. In this study, the signal timing and tram intersection waiting time calculation model was set up using analytical methods. In case studies using an isolated intersection, this study checks tram intersection waiting time ranged 12.7 to 29.4 seconds when variable green times of non-priority phases are 44 to 10 seconds under 120 seconds of cycle length.