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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 18, Issue 6 - Dec 2000
Volume 18, Issue 5 - Oct 2000
Volume 18, Issue 4 - Aug 2000
Volume 18, Issue 3 - Jun 2000
Volume 18, Issue 2 - Apr 2000
Volume 18, Issue 1 - Feb 2000
Selecting the target year
Guideline of Exclusive Bus and/or Truck Lane by FREFLO and INTEGRATION Models
Journal of Korean Society of Transportation, volume 18, issue 2, 2000, Pages 7~16
This study Presents an guideline of the exclusive bus and/or truck lane on 8 lanes freeways using FREFLO model and INTEGRATiON model. Four alternatives : do nothing, bus exclusive lane, truck exclusive lane, bus and truck exclusive lane, were evaluated using average daily vehicle travel time as measures of effectiveness. It is found that bus and truck exclusive lane is the most effective alternative reducing total travel time by 7% when ADT is below 80,000 vehicle/day. However, when ADT is above 80,000 vehicle/day and bus Proportion is above 12%, bus exclusive lane is the most effective alternative reducing total travel time by more than 5.6%. It is further found that INTEGRATION, the stochastic and microscopic model, is more sensitive than FREFLO, the deterministic and macroscopic model, in evaluating the effectiveness of four alternatives.
The Method of Deciding Design Level of Service with Optimal User Cost
Journal of Korean Society of Transportation, volume 18, issue 2, 2000, Pages 17~26
Estimating the appropriate Level of Transit Fare Discount for Transfer Passengers
Journal of Korean Society of Transportation, volume 18, issue 2, 2000, Pages 27~37
The Purpose of this study is to determine the level of fare discount and types of transit modes for implementing a transit fare discounting policy of transfer Passengers in Seoul. For simulation exercises to find the best alternative, the mode choice Parameters of SECOMM(Seoul Congestion Management Model) are used. The spatial scope of this study is bounded inside the city of Seoul, and the community buses and deluxe buses are exempted from the discount modes. The simulation results show that the most feasible alternative is the one that discounts 30% of transfer fares only between bus and subway Passengers on the condition that the fares be raised by 100 won for both modes. It is estimated that this will bring 0.2% increase of subway ridership while decreasing bus ridership to an ignorable level. and that the revenues of these two modes will increase by 80.2 billion won in a Year. If discounting 30% of fares for bus-to-bus transferers as well without a fare increase, it is expected that the revenue losses become serious, and that no less than 200 billion won Per clear be supported from the public side. Therefore, the latter is hardly implementable taking the deficit-ridden Public transit industries into account. There are several things needed to be further studied in order that the transfer discount system is Put into Practice in Seoul. They are, for instance, time internals to be accepted as transfer activities, the timing of fare discount (Per ride or Per Purchasing tickets), and how to make the bus egress time marked on transfer tickets.
Comparative study on the O/D estimation using Gradient method and Generalized Least Square method
Journal of Korean Society of Transportation, volume 18, issue 2, 2000, Pages 41~52
In the developing country, the transportation situation is changed very quickly and the transportation environment is not stable. So the transportation planning should be frequently made in considering the limited cost and time. And the traditional large-scale survey(household survey, roadside interview, etc.) has many Problem like the difficulty for doing it and getting mood results. Therefore the study about the method of evaluation on the traffic count based O/D matrix is Processing actively recently. Though the many study for the network in the realistic size are enacted, the study for comparing with the advantage and disadvantage of each method are few. Therefore this study mainly deals with the static method among the existing models of evaluation on the traffic count based O/D matrix(in terms of the transportation plan). Bi-level(GU) and gradient method are selected as main alternative model and analyzed their capability and validity. For testing the reliability of the models, Bi-level(GLS) and gradient method are adapted to toy network. Then we analyze the result of testing, and study the way for large network.
Evaluation on the traffic count based O/D matrix using Trip Length Frequency Distribution
Journal of Korean Society of Transportation, volume 18, issue 2, 2000, Pages 53~62
The majority of evaluating method on the traffic count based O/D matrix has analyzed the difference between a true O/D and a estimated O/D until now. But those ways have some Problem. It can't be known the true O/D when these methods for a realistic and large scale network are applied. Although it can be known, the reliability in the evaluated O/D is insufficient. A O/D using survey has the most information about current flow though the information is not current one. So the effective evaluating O/D method have not to change Preceding O/D information and have to be able to evaluate O/D with surveyed flow. Therefore in this study, TLFD(Trip Length Frequency Distribution) is determined as the criteria for reliability of evaluating O/D. TLFD can be used to check the similarity between the real Trip Length Distribution and the Trip Length Distribution of evaluated O/D. When real TLFD is similar to evaluated TLFD, the reliability of evaluated O/D is high. TLFD has been used for the expansion of sample O/D and verified. But until now no result has been verified the model for the evaluated O/D using TLFD. So in the study, it is suggested that resulting analysis can be adjusted as well as assessed in large scale network.
A study on logit choice probability model taking into account the problems of common-nodes and common-links
Journal of Korean Society of Transportation, volume 18, issue 2, 2000, Pages 63~71
One Problem of the choice Property in logit model is interpreted as the Problem of common links and common nodes in choice set. Common node Problem Plays important role in deciding the efficiency of network loading and common link problem is connected with choice Problem, both of which are to be solved to improve the logit choice model. Although much need has been pointed out for research on the topic, however, no Paper as yet considers these two factors at the same time. In the Paper we develop a new logit formulation, which is able to ease the logit Problem, widely known as the Problem of IIA(Independence of Irrelevant Alternatives). An example network is used to assess the Proposed model and compare it with other conventional models. From the results, we find out that the model is superior to others.
Development of a Cycle-free Based, Coordinated Dynamic Signal Timing Model for Minimizing Queue-Lengths (Using Genetic Algorithm)
Journal of Korean Society of Transportation, volume 18, issue 2, 2000, Pages 73~89
This Paper documents the development of a cycle free based, coordinated dynamic signal timing model for minimizing queue lengths using Genetic A1gorithm. The model was embodied using MAT-LAB, the language of technical computing. A special feature of this model is its ability to manage queue lengths of turning movements at the start of green times. The model produces a cycle-free based signal timing(cycles and green times) for each intersection to minimize queue lengths of turning movements on the cycle basis. Concurrently, appropriate offsets could be accomplished by applying cycle-free based signal timings for respective intersections. The model was applied to an example network which consists of three intersections. The result shows that the model produces superior signal timings to the existing signal timing model in terms of managing queue lengths of turning movements.
Optimal Congestion Charges in General Equilibrium
Journal of Korean Society of Transportation, volume 18, issue 2, 2000, Pages 91~101
The optimal congestion charge in transportation economics corresponds to the solution to the welfare maximization Problem for users of a certain road link where congestion takes Place. This congestion charge is in nature the optimal Price of the transportation facility, which is derived by the Partial equilibrium analysis on that facility. Therefore it is not certain that this congestion charge can maximize the well-being of all the users of the total transportation network, since the analysis does not count the impact of the congestion charge on traffic volumes of other links. This study suggests an alternative approach to estimate the optimal congestion charge. The key difference of this study from Previous ones is to derive the solution through the general equilibrium analysis on a market where several transportation facilities as well as Private goods are available to consumers. This approach shows a set of solutions a little different from the Previous one, which are explained below. The optimal congestion charge is derived for two different cases. One is the situation of which the congestion charge is levied on every transportation facility In this case, the optimal solution of each facility should equate the marginal utility of every user to the marginal cost of the corresponding facility. This analysis result in general equilibrium coincides with the Previous analysis result in partial equilibrium. However this result cannot apply to another case of which the charge is imposed only on a certain transportation facility. In this case, the optimal charge on a certain transportation facility should be less than the optimal congestion charge of partial equilibrium analysis.