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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 17, Issue 5 - Dec 1999
Volume 17, Issue 4 - Oct 1999
Volume 17, Issue 3 - Aug 1999
Volume 17, Issue 2 - Jun 1999
Volume 17, Issue 1 - Mar 1999
Selecting the target year
A Study on the Effects of Teleservice on Travel Demand
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 7~18
This Paper focuses on analyzing the influences of Teleservice on travel behavior and trip demand based on the individual behavior model. The first step is to classify individuals into different Person groups who will follow similar behavior Patterns in terms of travel and communication. And then, the effect of Teleservice on trip demand is estimated using hypothetical scenario. The results on the ability of each person group to adapt themselves to Teleservice show that full-time housekeepers and senior citizens are more likely to be alienated. It is also found that transition probability to Teleservice is high for activities in bank or public office where simple forms of information such as data or text are exchanged. On that basis, it is estimated that in Seoul the savings on trip demand by Teleservice will be 7.6% of total daily trip generations.
Analysis of Travel Modal Choice and the Temporal Transferability for Workers
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 19~32
In this study, the trip characteristics of workers in the city are systematically analyzed. The trip behaviors and socioeconomic characteristics of workers are analyzed using Person Trip Survey Data of 1988 and 1992 in Taegu Metropolitan area. With the results of behavioral analyses, the daily travel pattern of workers is shown as one tour contained two trips and it is relatively simple and stable. Also the rate using the same mode in a day is Presented as high ratio. So, it can be explained that the choice of worker\`s first trip is fixed his/her travel mode for his/her daily travel mode. Based on these analyses, the mode choice model for workers is developed by applying the Multi-nominal Logit Model with the choice set of bus, taxi, and car. The explanatory variables of this model include sex, age, auto, travel time, and cost. Empirical tests of the model show encouraging results. After that, the temporal transferability of the model is examined by the Pairwise t-test and five indexes far the model of 1988 and 1992. The results of examination are satisfied with each significance level of the explanatory variables and five indexes. Therefore. it can be concluded that the temporal transferability of this model developed in this study is resonable.
Risk Analysis of Highway Investment by Private Sectors
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 33~42
This Paper is the study about developing analytic methods to manacle the financial risk and applying to Seoul Metropolitan Ring Highway (SMRH) and Deageun-Danggin Highway(DDH) with Monte-Carlo Simulation Model (MCSM), the most efficient and useful tool to measure the financial risk. As the results of this study, the limitations of the deterministic method(Cost-Benefit Analysis, Sensitivity Analysis) are overcome by the Probabilistic project feasibility analysis suggested in this study. The case study is done to SMRH and DDH. In results Project feasibility of SMRH is beneficial if critical elements of cost are controlled Properly and that of DDH is not beneficial. These results give a guidance in risk Analysis of Korean private highway to measure the Project feasibility. The further study is needed to estimated more accurate distributions of cost elements on the base of field data.
The Value of Time in Intercity Freight Transportation
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 43~55
The value of time in freight transportation describes the importance of goods during transport and shows the direction of efficient logistic management having inventory cost in transporting The value of time differs from class to class in freight transportation. It is due to the differences of shipper's willingness to Pay for time saving. In this research the value of time in intercity freight transportation of manufacturers in Korea was estimated as follows: first, the Perception factors which were the important criteria of shippers for choosing truck were sampled. second, the shippers were classified into three homogeneous classes. third, the value of time of each class was estimated by using multinominal logit model. The results of this research showed that the value of time in freight transportation was different from every class, that the shipper had to Pay 1,680 won for saving one hour Per each shipment, and that the inventory cost in transporting occupied 9.54% in the mean freight Price.
Analysis of Prework Trip-Making and Modal Choice
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 57~65
This research develops a model of prework trip-making and modal choice. A nested logit model was found to be an appropriate approach. Data from the New York Metropolitan Statistical Area. collected as a Part of the 1995 Nationwide Personal Transportation Survey (NPTS) were used for empirical estimation of model parameters. The empirical results conformed several behavioral aspects associated with prework trip-making and modal Choice. The paper Presents a discussion on implications that can be inferred from the empirical results. Finally, future Potential research questions are also discussed.
Development of the Reliability Traffic Assignment Model based on the Travel Time Variation
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 69~78
This paper defines the reliable based route choice Principle and formulates the reliability based equilibrium traffic assignment using the Principle. The reliability is defined as the difference of travel demand and capacity using the interference theory of the system engineering. An efficient solution a1gorithm based on Frank-Wo1fe algolithm is Presented to calculate and compare the reliability based traffic assignment with conventional travel time based assignment using small and large scaled road networks. The results show that reliability based traffic assignment converges to equilibrium solution in a reasonable computing time. The equilibrium link flows between reliability and travel time based traffic assignment differ each other in the sense that reliability based assignment is assigned based on the maximum difference of travel demand and link capacity whilst travel time based is assigned on the shortest travel time.
A study on Design and Evaluation of The Continuous Flow Intersection
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 79~86
Traffic jams of our country are due to the shortage of roadway as compared with the traffic, however. they are sometimes due to inconsistency of the roadway capacity. Inconsistency of the roadway capacity comes from the difference of cycle length, phase length and number of Phase between major intersection and minor intersection. Specialty increasing number of Phase due to left-turn movements bring out decrease of the arterial capacity, deterioration of the arterial offset. The Purpose of this research is to introduce and analyze the continuous flow intersection to solve the bottleneck of the major intersection. The major contents of this research introduce the concept and design consideration for the continuous flow intersection and also analyze delay, fuel consumption and emissions among multiphase intersection, grade separated intersection and continuous flow intersection. This research analyze the sensitivities according to change of the left-turn traffic volume and also evaluate the cost-effectiveness through the total cost analysis among three of them.
Development of an Integrated network model for Mode Choice and Trip Assignment
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 87~98
The Procedure of conventional travel demand analysis has been classified into two steps such as modal choice and traffic assignment. But as diverse transportation modes have been available, transfer between the modes are frequently occurred, thus it is necessary to integrate the transfer behavior into the models. In this respect the combined traffic assignment model with mode choice Proposed by Sheffi(1985) may bring out unrealistic results because it can not take account of traveller's transfer behaviour. To cope with the limitation. In the Paper we develop a new integrated traffic assignment model which can consider the transfer behaviour between auto and transit. The model is based on person trip, not vehicle trip. In order to find the shortest path on the multi-modal network, we also developed a Link-based Shortest Path A1gorithm(LSPA). With an example network. we test the model and compare it with the combined model
Adaptability Questions of O-D Table Estimation Models
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 99~110
This study deals with the adaptability questions of O-D table estimation models. Its objectives are two-fold; (1) to estimate the characteristics of various O-D table estimation models(i.e. linear regression models. entropy models and statistic models) and (2) to find the model which estimates the O-D table with the best accuracy under the various data conditions. In Pursuing the above, this study gives the particular attentions to the test of the models, using the Sioux Falls network and equilibrium assignment method of MINUTP. The major findings are the followings. Firstly. it finds that the statistic models have the most goodness of fat among all models, if the required data are all Prepared. But it Presents that statistic models are the most sensitive against the underspecification and inconsistency problems of link data. Secondly, It shows that the linear regression models have the worst goodness of fat among all models. But the linear regression models are the most insensitive to the underspecification and inconsistency problems. Thirdly, THE/1 model of entropy model is sensitive against the underspecification and incon-sistency problems, but THE/2 model is insensitive. Finally, other informations like total volume, zonal Production and attraction volumes in 0-D table, help models to gain the better goodness of fit. Especially, in the statistic models. both the zonal production and attraction volume data are helpful to estimate the link volumes. It can be expected that the results dive some implications not only to the selection of optimal model under the various given data, but also to the development or modification of model.
A Service Network Design Model for Less-than-Truckload Freight Transportation
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 111~122
A service network design model for LTL freight transportation is formulated as a mixed integer Programming Problem with two heuristic solution a1gorithms. The Proposed model derives the transportation Path for each origination-destination pair, taking into account transportation cost over the links and handling costs over the nodes. The first algorithm searches for a local minimum solution from a given initial solution by improving the quality of solution repeatedly while the second a1gorithm searches for a better solution using Simulated Annealing Method. For both solution algorithms, the initial solution is derived by a modified reverse Diikstras shortest Path a1gorithm. An illustrative example, Presented in the last part of the Paper, shows that the proposed algorithms find solutions which reduce the cost by 12% and 15% respectively, compared to the initial solution.
Count Data Model for The Estimation of Bus Ridership (Focusing on Commuters and Students in Seoul)
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 123~135
The rapid increase of Passenger cars which is caused by the discomfort of Public transit and the Preference of automobiles is the major factor of increasing traffic congestions in Seoul With the point that leading the automobilists to the Public transit can be the most important Policy to ease these traffic congestions, this study focuses on the behavioral aspects of company employees and university students and investigates factors influencing bus ridership. To be brief, by estimating bus ridership through count models, this study investigates factors which influence bus ridership and elicits Political suggestions which lead automobilists to Public transit. The Purpose in this study is the application of appropriate count data model. The count data models have been widely applied to the economic area from the middle of the 1980s and to transportation aspect mainly in the foreign countries from the latter half of the 1980s. Even though a few studies in this country employed count data model to count data. all of them were Poisson regression models without suitable tests for the importance of the model specification. In the end, as the result of statistical test, negative binomial regression model which is suitable for overdispersed data was found to be appropriate for the data of weekly bus ridership. To emphasize the importance of model specification, both of poisson regression model and negative binomial regression model were estimated and the results were compared.
Analysis of Traffic Flow on Weaving Sections Using Stochastic Models
Journal of Korean Society of Transportation, volume 17, issue 5, 1999, Pages 137~149
For decades, many traffic flow studies on the analysis and determination of level of service (LOS) for the weaving sections have been made to Provide several regression equations. Weaving and non-weaving speeds were dependent variables for the equations, with independent variables being weaving length, number of lanes, and weaving ratios. One of the difficulties in developing the equations was that the weaving areas were rare in Korea, so the statistical analyses for calibrating the equation parameter could not be performed in a desirable manner. In this regard, a new and stochastic methodology for predicting the weaving and non-weaving speeds within the weaving sections was required. In this study the following design variables were developed; influence area of the weaving section. headway distribution within the weaving section, maximum weaving volume of the weaving section, length of the ideal weaving section, and speed estimations for the weaving and non-weaving flows. The evaluation of the new model was made comparing the delay in the weaving section with the one in the freeway basic section.