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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Transportation
Journal Basic Information
Journal DOI :
Korean Society of Transportation
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Volume & Issues
Volume 13, Issue 4 - Aug 1995
Volume 13, Issue 3 - Jun 1995
Volume 13, Issue 2 - Apr 1995
Volume 13, Issue 1 - Feb 1995
Selecting the target year
Jobs-Housing Mismatch and Wasteful Commuting in Seoul
Journal of Korean Society of Transportation, volume 13, issue 3, 1995, Pages 5~17
One of interesting issues in urban land-use and transportation policy is about an unproven belief that imbalances between employment and residential sites strongly influence urban commuting patterns. The purpose of this study si to find how spatial distribution of jobs and housing affects commuting distances in Seoul Metropolitan Area using 1990 Census O-D Data. This study estimates cost-minimizing required commuting distance, given the actual distributions of jobs and housing , and compares required commuting distances with actual commuting distances. One of findings is that the standard urban economic theory explains only 1/3 of actual commuting in the case study area. The policy implication of this study is that jobs-housing balance policy will have only a minor effect on the actual commuting.
Traffic Assignment Incorporating Route Choice Behavior in Hierachical Highway Structure
Journal of Korean Society of Transportation, volume 13, issue 3, 1995, Pages 19~33
Conventional traffic assignment techniques usually do not consider traveler's route choice behavior affected by hierachicla strucfture in urban highway system. This study realizes the route choice behavior such that travelers tend to choose more higher level of highway rather than lower level of highway for longer trops. Otherwise, for shorter trips, travelers tend to choose lower level of highway unless they can get sufficient travel time saving by using mojor arterial street or freeway (higher level of highway). Therefore, this study suggests a traffic assignment technique incorrporating route choice behavior related to hierachical highway structure by introducing some perception costs to generalized cost function such as perceptional preference measureemnt for higher level higheay and perceptional penalty when changing to different level of highway. Through simulation analysis, it is shown that the simulation results with the new traffic assignment echnique can be different a lot from the results with the convential method.
Network Representation Schemes for U-TURN and Implementation in the Vine-Based Dijkstra Shortest Path Algorithm
Journal of Korean Society of Transportation, volume 13, issue 3, 1995, Pages 35~52
This paper reviews both network representation schemes of transportation network and algorithms for findings the shortest path between two points in the network. Two types of network representation schmes for considering U-Turn have been proposed along with some modifications of the vine-based Dijkstra shoretest path algorithm. The traditional Sioux-Fall network has been chosen and modified with the introduction of left-turn prohibitions and U-Turns for the purpose of evaluating the peroformance of two modified algorithms and network representation schemes(NA1 an d NA2 ). This type of modification in both network representation scheme (including network data) and algorithms is not only supposed to be needed for route guidance but supposed to contribute to finding more realistic path and estimating more accurate traffic voulume thorughout the entire network.
A Model for Determining the Minimum Number of High Speed Exits and Their Locations for Airports
Journal of Korean Society of Transportation, volume 13, issue 3, 1995, Pages 53~65
Proposed are model and its solution algorithm for determining the minimum number of high speed exits and their locations. While the previous researches on exit location aimed to minimize the average runway occuancy time (ROT) of an aircraft mix, the proposed approach is to find the minimum number of exits required to meet maximum allowable ROT. The rationale behind the approach is that the capacity of a runway increases as the ROT decreases down to some value, but not any more even though the ROT keep decreasing below the value. Hence, a maximum allowable ROT might be set up without declining the capacity. The problem is transformed into a shortest path problem on a specially constructed network and Dijkstra's labeling algorithms is employed to solve the problem A hypothetical example is provided to illustrate how the algorithms solves the problem.
The Decision of the Optimal Shape of Inductive Loop for Real-Time Traffic Signal Control
Journal of Korean Society of Transportation, volume 13, issue 3, 1995, Pages 67~86
It requires the detector system which can collect highly reliable traffic data in order to perform the real-time traffic signal control. This study is to decide the optimal shape of inductive loop for the real-time traffic signal control .This loop is located at the stopline in the signalized intersection for DS(Degree of Saturation) control. In order to find out the optimal shape of loop, 6types of experiments were performed . The results of the basic experiments of loops are as follows ; -the optimal number of turns for loop is 3 turns. -the impedance values of the loop detectors are similar to that of NEMA standards -the 1.8
4.5M loop is excellent for sensitivity in actual detection range of car length comparing to other shape of inductive loops. At the experimental of establishments of the optimal loop shape, it found that 1.8 4.5M loop has the highest values of
comparing to other types of loops, It means that the range of Lead-in cable length of this loop. And this loop is highly reliable in occpupancy time. Conclusivley, the 1.8
4.5M inductive loop is the optimal solution as a stop line loop detector for real -time traffic signal control.
A Network Aggregation Procedure for Solving Network Design Problem
Journal of Korean Society of Transportation, volume 13, issue 3, 1995, Pages 87~98
Speed Prediction Models for Freeway Merging Area
Journal of Korean Society of Transportation, volume 13, issue 3, 1995, Pages 99~120