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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 15, Issue 4 - Dec 1997
Volume 15, Issue 3 - Sep 1997
Volume 15, Issue 2 - Jun 1997
Volume 15, Issue 1 - Mar 1997
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Analysis of Urban Workers' Travel Pattern Choice Behavior
Journal of Korean Society of Transportation, volume 15, issue 4, 1997, Pages 35~51
The main objective of this research is to develop urban workers' daily travel pattern choice model. For this research, a hovel pattern choice model was empirically estimated by using a survey data collected from Kyongsan and Yeungchun City. For this research, a nested logit model structure was employed. For the model specification, it is hypothesized that urban workers' daily travel pattern choice behavior is represented by two stages of choices with single-destination or multi destination travel pattern choice as the higher stage, and the number of tours as the lower stage. The urban workers' daily travel pattern choice model developed in this research yields intuitively reasonable results. From the empirical results, it is found to be sensible to represent urban workers' daily travel patterns as the nested logit model structure Hypothesized in this research. furthermore, future directions of model development are suggested.
Estimation of Link Travel Speed Using Single Loop Detector Measurements for Signalized Arterials
Journal of Korean Society of Transportation, volume 15, issue 4, 1997, Pages 53~71
This paper presents a methodology for estimating average travel speed using volume and occupancy data from single magnetic loop detectors for signalized arterials. Three methods were developed and evaluated using field data: VPLUSKO method, fuzzy control method, and neural network method. While the VPLUSKO method is easy to apply, it results poor performances compared to other methods. The neural network method showed the best performances among the candidate methods. This method revealed the weakness in transferability, however. From limited cases of field test, it was concluded that the method of the fuzzy control application showed reasonable performance of estimation. It was also demonstrated that the fuzzy control method has the capability of transferability.
A Study of Proposing Standard for Traffic Signal Warrants Corresponding to Traffic Volumes
Journal of Korean Society of Transportation, volume 15, issue 4, 1997, Pages 73~90
The warrants to install traffic signals used in U.S.A. are well specified comparing to those in other countries. Among the eleven warrants of the U.S.A., the Warrant 9, 10, and 11 are especially fit in practice. The warrant relaxed to traffic volumes used presently in Korea have been adopted from the U.S.A. Those may not have been reliable in the traffic situation of Korea. The rules required passing through intersections are not kept well at intersections controlled without signals. The purposes of this study are to test and evaluate the reliability of the Warrant 9 and 11 adopted form U.S.A.n Korean traffic situation and to propose new traffic signal warrants related to traffic volumes fitted in here. The traffic volume warrants are proposed considering the situation of rules not being kept well(current situation) and that of vice versa(ideal situation). The results of this study are following; 1) The total volumes warranted to traffic signals are 1600vph, 1700vph, and 1800vph at 4-legs intersection having 1 by 1 lane, 1 by 2 lanes, and 2 by 2 lanes respectively. The total volumes warranted are 1400vph and 1600vph at 3-legs intersection haying 1 by 2 1anes, and 2 by 2 lanes respectively. 2) Another traffic warrants proposed are transformed from the currant warrants 9 and 11. These warrants are composed of the total volumes and the ratio of the volume of the minor street to that of the major street.
A Study on the Fuzzy System for Freeway Incident Duration Analysis
Journal of Korean Society of Transportation, volume 15, issue 4, 1997, Pages 143~163
Incident management is significant far the traffic management systems. The management of incidents determines the smoothness of freeway operations. The dynamic nature of incidents and the uncertainty associated with them require solutions based on the incident operator's judgment. Fuzz systems attempt to adapt such human expertise and are designed to replicate the decision making capability of on operator. Fuzzy systems process complex traffic information, and transmit it in a simplified, understandable form to human traffic operators. In this study, fuzzy rules were developed based on data from real incidents on Santa Monica Freeway in LosAngeles. The fuzzy rules ail linguistic based, and hence, user-friendly. A comparison of the results from the linguistic model with the real incident durations indicate that the outputs from the model reliably correspond to real incident durations conditions. The model reliably predicts the freeway incident duration. The modes can thus be used as an effective management tool for freeway incident response systems. The approach could be applied to other problems regarding dispatch systems in transportation.