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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 of Safety Evaluation by Using Traffic Conflict Technique at an Intersection
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 9~17
There have been a lot of efforts to improve traffic safety. In order to improve traffic safety, the first step is to evaluate safety level at a particular location. In Korea, the safety evaluation technique stated being utilized recently. In this study, among many different safety evaluation techniques, the traffic conflict technique(TCT) has been chosen as an evaluation tool. The TCT is well known evaluation tool in other countries. however, it is not common in Korea. The objectives of this study are to introduce the TCT and set up a methodology which can be applied in Korea, including a case study. There are several different TCT methodologies and among them the Swedish method is considered as the most advanced one. Therefore, in this study, a new method has been developed based upon the Swedish method. Usually, traffic conflict, can be divided into two categories. One is the serious conflict and the other is the non-serious conflict. In order to develop the relationship between conflicts and accidents, only the serious conflicts are considered because the non-serious conflict do not seem to lead to an accident. To divided the conflicts, Zone I and II are used for the serious conflict zones and Zone III and IV are used for non-serious conflict zone. The conversion factors from conflicts to accidents have been estimated through the case study for each zone. The results show that the value of the conversion factor for zone I is the biggest as expected. It means that the TCT can be used as a safety evaluation method replacing the accident analysis. Especially, the TCT seems very effective when accident data are not sufficient and time is limited. In this point of view, it is concluded that the TCT can be a powerful safety evaluation tool
Comparison of Freeway Capacity and Level of Service of Each Country HCM
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 19~31
A first version of KHCM was Published in 1992, and is currently used extensively in engineering Practice. The study of new manual was initiated in 1998 and is intended to be ready for publication by the year 2000. The purpose of this paper is to indicate the study direction of basic freeway section by comparing the results of each country HCM. 1985 USHCM, 1997 USHCM, 1992 K17CM, German HCM, Japan HCM, Australian HCM. Taiwan HCM, and Canadian HCM have been reviewed. All the country except Germany followed the same method developed in 1985 USHCM for analysing basic freeway section. Therefore the method of USHCM and German HCM have been introduced in detail. Finally. the Problem of 1992 KHCM have been suggested.
An Experimental Evaluation and Economic Analysis for LED Traffic Signal
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 33~44
The Purpose of this study is to evaluate application on road and analyze economy for light emitting diodes (LEDs) traffic signal. Incandescent lamps in traffic signal can be replaced with LEDs for demand savings of energy and maintenance cost. Typical LED traffic signals use 10 to 15 watts approximately 85 percent less than 110 watts incandescent traffic signals. Compared to incandescent traffic signal, LEDs have higher source efficiency. In this paper, it verified that LEDs in red traffic signals can be reduced the energy consumption of incandescent traffic signals by average 76 percent. As a result of an economic analysis to LED traffic signals, the Pay back Period 6 years and so it retrofit to incandescent traffic signals appropriate. In pedestrian's visibility, 84 Percent of inter-viewers answered that visibility of LED traffic signals is better than that of incandescent traffic signals. As further study, it will be established LED traffic signal specification by experimental data in this paper.
A Development of Multi-Period Bus Scheduling Model
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 47~58
The Purpose of this Paper is to develop a multi-period bus scheduling model, in which a decomposition technique is applied. In general a bus scheduling requires a vast amount of calculation. Thus, a bus scheduling is a very complicated problem even with a single depot and is almost unable to obtain the optimal solution theoretically with many depots. In this paper in order to simplify the problem, the whole operating hours of a day are partitioned into several time periods. In one period, the same headways are maintained. For one period, the bus scheduling is simple and the solution applying the FIFO(First-In, First-Out) Principle is the optimal. However, connection between Periods remains as another scheduling Problem with a reduced problem size. This paper suggests how to connect bus schedules of consecutive periods efficiently, minimizing the operating cost. Through case studies for multiple routes with a single depot, this decomposition technique is proved to be effective practically.
An Incident-Responsive Dynamic Control Model for Urban Freeway Corridor
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 59~69
A Freeway corridor is a network consisting of a few Primary longitudinal roadways (freeway or major arterial) carrying a major traffic movement with interconnecting roads which offer the motorist alternative paths to his/her destination. Control measures introduced to ameliorate traffic performance in freeway corridors typically include ramp metering at the freeway entrances, and signal control at each intersections. During a severe freeway incident, on-ramp metering usually is not adequate to relieve congestion effectively. Diverting some traffic to the Parallel surface street to make full use of available corridor capacity will be necessary. This is the purpose of the traffic management system. So, an integrated traffic control scheme should include three elements. (a)on-ramp metering, (b)off-ramp diversion and (c)signal timing at surface street intersections. The purpose of this study is to develop an integrated optimal control model in a freeway corridor. By approximating the flow-density relation with a two-segment linear function. the nonlinear optimal control problem can be simplified into a set of Piecewise linear programming models. The formulated optimal-control Problem can be solved in real time using common linear program. In this study, program MPL(ver 4.0) is used to solve the formulated optimal-control problem. Simulation results with TSIS(ver 4.01) for a sample network have demonstrated the merits of the Proposed model and a1gorithm.
The Development of A Dynamic Traffic Assignment Technique using the Cell Transmission Theory
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 71~84
The purpose of this study is to construct a dynamic traffic analysis model using the existing traffic flow theory in order to develope a dynamic traffic assignment technique. In this study the dynamic traffic analysis model was constructed using Daganzo's CELL TRANSMISSION THEORY which was considered more suitable to dynamic traffic assignment than the other traffic flow theories. We developed newly the diverging split module, the cost update module and the link cost function and defined the maximum waiting time decision function that Daganzo haven't defined certainly at his Papers. The output that resulted from the simulation of the dynamic traffic analysis model with test network I and II was shown at some tables and figures, and the analysis of the bottleneck and the HOV lane theory showed realistic outputs. Especially, the result of traffic assignment using the model doesn't show equilibrium status every time slice but showed that the average travel cost of every path maintains similarly in every time slice. It is considered that this model can be used at the highway operation and the analysis of traffic characteristics at a diverging section and the analysis of the HOV lane effect.
Day-to-day dynamic combined model on the evaluation of traveller's traffic information for multi-mode and multi-class
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 85~97
The Purpose of this Paper is the development of the day-to-day dynamic combined model on the evaluation of traveller's traffic information for multi-mode and multi-class environments. Information is assumed to be provided for multi-mode such as bus and automobile. and multi-class such as a driver with and without route guidance equipment when they depart for their trips. The information provision strategies have been developed in the base of user equilibrium, system optimum and in between them. The Sioux Falls network is used for the evaluation of the model and information provision strategies. In the numerical analysis, a Braess' paradox for the information provision, which is the increase of travel time even though the number of information usage level and user are increased, has been occurred so that these kinds of information strategies should be implemented with special care.
Internalizing Environmental Cost using TDM Alternatives
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 99~110
With a growing awareness, transportation is the maior source of urban air pollution. Planners and policy-makers are strongly urged to care the impacts of transportation management strategies on environment. Since transport-related air Pollution can be regarded as negative externalities of transport, it is indispensable to evaluate chanties in air quality which seems to occur when proposed transport measures are implemented. In addition, transport measures should be integrated in a set of combined Paradigm regarding transport and environment. Based on the integrated Paradigm between transportation demand management(TDM) and environmental planning, the main focus is given to apply environment cost internalizing measures to the short-term congestion management Program(SCMP) in Seoul, that has been developed in 1998 by Seoul Development Institute. Three modules are analyzed: without and/or with ￦500, ￦1000 emission plus gas tax, respectively. From the empirical applications on Seoul city, one of the most exemplary findings in SCMP program is that, emission plus gas tax can be a very useful measure to reduce vehicular emissions by targeting major Pollutants differently, rather than by dealing with pollutants collectively. Further research that provides (1)showing the spatial variation of pollution levels along the intersections, (2)more developing combined Paradigm between transport, land use, and environment, (3)using environmental road capacity rather than Physical-aspects of road capacity, and (4)continuing R&D on air quality constrained TDM, can contribute significantly to applications of the real and efficient environment-constrained transportation planning.
Development of Vehicle Classification Algorithm Using Magnetometer Detector
Journal of Korean Society of Transportation, volume 17, issue 4, 1999, Pages 111~124
The Purpose of this thesis is to develop a vehicle classification algorithm using single Magnetometer detector during presence time of vehicle detection and is to examine a held application from field test. We collected data using Magnetometer detector on freeway and used digital data to change voltage values according to magnetic flux density in analysis. We collected these datum during the presence time and then obtained characteristics from wave form in these datum. Based on these characteristics, We used the following three methods for this a1gorithm :1. Template Matching Method,2. Neural Network Method using Back-propagation Algorithm 3. Complex Method using changed slope points and mixing method 1, 2. Of course, Before processing of over three methods, These data were processed normalizing by 20, 40 of size in only X axis and moving average by 0, 3, 4, 5 of size. Vehicle classification were Processed in three steps ; 2, 3, 5 types classification. In 2 types vehicle classification, recognition rate is 83% by template matching method.