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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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Korean Society of Transportation
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Volume & Issues
Volume 30, Issue 6 - Dec 2012
Volume 30, Issue 5 - Oct 2012
Volume 30, Issue 4 - Aug 2012
Volume 30, Issue 3 - Jun 2012
Volume 30, Issue 2 - Apr 2012
Volume 30, Issue 1 - Feb 2012
Selecting the target year
A Technique of Forecasting Market Share of Transportation Modes after Introducing New Lines of Urban Rail Transit with Observed Mode Share Data
Seo, Dong-Jeong ; Kim, Ik-Ki ; Lee, Tae-Hoon ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 7~18
DOI : 10.7470/jkst.2012.30.1.007
This study suggested a method of forecasting market-share of each mode after introducing new urban rail transit lines. The study reflected the observed market share of presently operating urban rail transit into forecasting process in order to improve accuracy in predicting market share of each modes. For more realistic representation of the forecasting model, we categorized O/D pairs according to attributes of trip distance, access time and number of transfers. The analysis results of traveler's mode choice behavior with observed data showed that the trip distances are longer, the share of urban rail tends to be higher, and that the number of transfers is fewer and the access times are lesser, the share of urban rail also tends to be higher. Then, incremental logit model was used in estimating mode choice probabilities for O/D pairs along with rail transit lines while utilizing observed market shares of each modes and differences in transit service level. As the next step, the market share of rail transit after introducing new rail transit lines was forecasted by using incremental logit model with the intial share values calculated the previous analysis step. It also reflected changes in level of service for automobile in highway due to changes in highway systems and changes in mode shares after introducing new lines of rail transit. It can be expected that the proposed method would more realistically duplicates phenomena of mode choice behavior for rail transit and that it would be more theoretically logical than the typical existing methods using SP data and incremental logit model or using addictive logit model in this country.
Calculation of the Peak-hour Ratio for Road Traffic Volumes using a Hybrid Clustering Technique
Kim, Hyung-Joo ; Chang, Justin S. ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 19~30
DOI : 10.7470/jkst.2012.30.1.019
The majority of daily travel demands concentrate at particular time-periods, which causes the difficulties in the travel demand analysis and the corresponding benefit estimation. Thus, it is necessary to consider time-specific traffic characteristics to yield more reliable results. Traditionally, na
ve, heuristic, and statistical approaches have been applied to address the peak-hour ratio. In this study, a hybrid clustering model which is one of the statistical methods is applied to calculate the peak-hour ratio and its duration. The 2009 national 24-hour traffic data provided by the Korea institute of Construction Technology are used. The analysis is conducted dividing vehicle types into passenger cars and trucks. For the verification for the usefulness of the methodology, the toll collection system data by the Korea Express Corporation are collected. The result of the research shows lower errors during the off-peak hours and night times and increasing error ratios as the travel distance increases. Since the method proposed can reduce the arbitrariness of analysts and can accommodate the statistical significance test, the model could be considered as a more robust and stable methodology. It is hoped that the result of this paper could contribute to the enhancement of the reliability for the travel demand analysis.
Research on Domestic Driving Pattern for International Standardization of Light-duty Vehicles Emission Test Method
Choi, Kee-Choo ; Park, Jun-Hong ; Lee, Jong-Tae ; Kim, Jeong-Soo ; Lee, Kyu-Jin ; Yi, Yong-Ju ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 31~43
DOI : 10.7470/jkst.2012.30.1.031
Domestic road type-and period-specific driving pattern measurement was required as Korea's participation in developing "Worldwide harmonized light-duty vehicle emission test procedure (WLTP/DHC)" studied by UN WP29. This study measured road driving data reflecting road and traffic conditions of Korea, and analyzed seven types of representative road type-and period-specific driving patterns with driving pattern standardization methodology proposed by WP29. PAMS (Portable Activity Monitoring Systems) equipment was used to collect enormous (35,410km) road driving data. There are significant difference among seven derived driving patterns.
Research Trend for Improvement of Freight Demand Estimation Methods
Shin, Seung-Jin ; Park, Dong-Joo ; Oh, Jeong-Taek ; Kim, Si-Jin ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 45~58
DOI : 10.7470/jkst.2012.30.1.045
The traditional four-step demand model has limits in that it cannot reasonably reflect the logistic characteristics of freight transportation system. This is likely to cause problems when estimating the effects of logistics facilities. In order to enhance the reliability and availability of the freight demand estimation procedure it is needed to develop freight demand model which takes into account the logistic characteristics of firms. In the late 1990s, a number of researches on freight demand model considering logistics behaviors began in Europe while a few studies in the area have been conducted recently in Korea. This paper reviews recent advances of the freight model developments in the context of logistic behavior consideration. The main topics include 1) commodity classification, 2) P/C(Production- Consumption) estimation, 3) logistics network representation, 4) logistics chain model, and 5) commodity flow survey. In addition, this paper proposes future direction of the freight demand models with respect to the consideration of logistics characteristics.
Evaluation of Dynamic Lane Allocation Method at Climbing Lane Section
Ko, Han-Geom ; Choi, Yoon-Hyuk ; Oh, Young-Tae ; Kang, Jeong-Gyu ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 59~72
DOI : 10.7470/jkst.2012.30.1.059
In aspects of traffic operation, a climbing lane may cause traffic congestion if the volume of traffic (v/c) grows and the ratio of heavy vehicle increases. Conversely, it would be effective, if the climbing lane is dynamically operated according to changes in traffic flow. However, there are no guideline to effectively control this climbing lane in aspects of traffic operation. In this study, we examine the necessity of flexible traffic operation criteria and its process for dynamic traffic management and also establish and analyze the effect of flexible traffic operation criteria in accordance with traffic properties using an example of climbing lane. We selected the operation criteria (critical travel speed), which decides whether to operate or close the climbing lane when the average travel speed of climbing lane is 50km/h based on VISSM (microscopic traffic simulation) analysis of Nakdong junction towards Masan with the volume of traffic (v/c), ratio of heavy vehicle as the traffic operation parameters. Based on the simulation result in accordance with the volume of traffic by the operation mode of climbing lane, the analysis on the effect of dynamic traffic management of climbing lane showed that the dynamic traffic management provides more convenience compare to the operation and close of climbing lane. Thereby, we proved that the dynamic traffic management of climbing lane is more effective.
The Analysis of the Impact of Heavy Vehicles in Urban Freeway Basic Section
Kim, Tae-Heon ; Roh, Chang-Gyun ; Son, Bong-Soo ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 75~83
DOI : 10.7470/jkst.2012.30.1.075
This study is to find a shortcoming embedded in the current Korean Highway Capacity Manual (KHCM) on reflecting a heavy vehicle effect to the highway capacity. The KHCM suggests to handle the percent heavy vehicle to deal with its effect to a capacity regardless of density levels. Authors hypothesized in this study that the effect of heavy vehicles would vary at different levels of traffic density - the effect would be comparably insignificant when a density is low and it becomes comparably significant when it becomes high. Field data from a freeways located in Seoul were collected for 360 hours (15 days) and categorized them into a set of operation conditions grouped by 15 minutes and by the LOS density levels. Comparison between the field measured and the estimated by the KHCM method showed that the KHCM method overestimated the effect of heavy vehicles in LOS B and C but underestimated in LOS E. The results suggested that there be a difference pattern from the one the KHCM expected and brought discussion on further studies.
The Research for USN Applications of Parking Guidance and Information System
Lee, Keun-Hee ; Kum, Ki-Jung ; Son, Seung-Neo ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 85~101
DOI : 10.7470/jkst.2012.30.1.085
Parking guidance and information systems have been introduced to response the inefficient and inconvenience use of parking facilities. While advanced countries have reached effective use of parking guidance information system, the Republic of Korea has yet suffered from the lack of full use of advanced technologies. This study proposes an algorithm designed for a systems utilizing the USN technologies. A field test was performed. The test results showed that information from the proposed system is much reliable when compared to the one from the existing.
The Trip Generation Models with Time-effects
Kim, Sang-Rok ; Kim, Jin-Hee ; Kim, Hyung-Jin ; Chung, Jin-Hyuk ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 103~112
DOI : 10.7470/jkst.2012.30.1.103
This research introduces a trip generation model reflecting time-series effects derived from a panel analysis with the data collected from the national household trip surveys conducted in 1996, 2002 and 2006. The existing methods are unable to reflect time-series effects from the change of socioeconomic conditions because the parameters applied to the model were basically from the base year of study - the parameter values were unchanged. This study proposes a new trip generation model developed through a panel analysis performed with the data collected from the last three national household trip surveys. From the results, it was found that the number of school trips increases and that the number of shopping trips decreases as time passes. The results showed that there are time-series effects affecting in trip generation.
A Study on the Modal Split Model Using Zonal Data
Ryu, Si-Kyun ; Rho, Jeong-Hyun ; Kim, Ji-Eun ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 113~123
DOI : 10.7470/jkst.2012.30.1.113
This study introduces a new type of a modal split model that use zonal data instead of cost data as independent variables. It has been indicated that the ones using cost data have deficiencies in the multicollinearity of travel time and cost variables and unpredictability of independent variables. The zonal data employed in this study include (1) socioeconomic data, (2) land use data and (3) transportation system data. The test results showed that the proposed modal split model using zonal data performs better than the other does.
A Model and Algorithm for Optimizing the Location of Transit Transfer Centers
Yoo, Gyeong-Sang ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 125~133
DOI : 10.7470/jkst.2012.30.1.125
This paper deals with the passenger transfer trips counted from smart bus-card data from Seoul transit network to understand the current operational condition of the system. Objective of this study is to relocate the location of the transit transfer centers. It delivers a bi-level programing model. The upper model is a linear 0-1 binary integer program having the objective of total travel cost minimization constrained by the number of transfer centers and the total construction budget. The lower model is an user equilibrium assignment model determining the passengers' route choice according to the transfer center locations. The proposed bi-level programming model was tested in an example network. The result showed that the proposed was able to find the optimal solution.
Estimates of Time-varying Values of Traffic Information on Variable Message Sign
Rhee, Kyoung-Ah ; Lee, Young-Ihn ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 135~147
DOI : 10.7470/jkst.2012.30.1.135
The benefit of traffic information on variable message sign can be divided into two. At the public level, the benefit of ATIS is the travel time saving, which is not only induced from ATIS, but also mixed with that of ATMS. In the economic appraisal of ITS, the benefit of ATIS has so far been regarded as the derived benefit from ATMS. At the user level, the benefit of ATIS is reduced driver uncertainty through the forward traffic status information. User can benefit from the information on VMS and therefore may have the willingness to pay for it. Recently attempt to qualify the value of information on VMS was increased, but there was a danger of distorting or over-estimates of the ATIS benefit because the related studies didn't consider the time-dependent attributes of traffic information and provided the single value. Estimates of the time-varying value should be needed for a rigorous economic appraisal of ATIS. In this study, we varied the value of information on VMS according to peak and non peak trip and verified the hypothesis that time-varying of value was statistically significant.
Service Evaluation Models from Transit Users' Perspectives
Kim, Won-Gil ; Roh, Chang-Gyun ; Son, Bong-Soo ;
Journal of Korean Society of Transportation, volume 30, issue 1, 2012, Pages 149~159
DOI : 10.7470/jkst.2012.30.1.149
The evaluation of public transit service quality is more complicated than evaluating other aspects of transportation service. Although various measures of effectiveness [MOEs] for transit service have been studied and applied, a more comprehensive and accurate MOE is still required. In the past, either data from user surveys or the experience of bus agency administrators and/or engineers used to measure the quality of service. However, recently, with reliable and accurate real time data from BMS(Bus Management System) and BIS(Bus Information System), more reliable and accurate MOEs are available. This study develops a service evaluation model from users' perspectives, which is based on user' cost models that consider passenger access time, riding time, waiting time, and discomfort due to in-vehicle overcrowding, violation of traffic laws, and accident rate. For validating proposed model, data from the BMS and transit-fare cards (T-Money Card) for Seoul's No. 472 main bus line were used. Models developed in this study provided reliable results.