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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 22, Issue 7 - Dec 2004
Volume 22, Issue 4 - Aug 2004
Volume 22, Issue 3 - Jun 2004
Volume 22, Issue 2 - Apr 2004
Volume 22, Issue 1 - Feb 2004
Volume 22, Issue 6 - Jan 2004
Volume 22, Issue 5 - Jan 2004
Selecting the target year
A Study on Warrant Rearrangement Using Efficiency Analysis of Reversible Lane
Oh, Sei-Chang ; Choi, Bo-Hyuk ;
Journal of Korean Society of Transportation, volume 22, issue 1, 2004, Pages 7~18
To solve the urban traffic congestion problem, Seoul and other major cities have operated the reversible lanes as Transportation Systems Manage-ment(TSM) method since 1981. However, few studies have been conducted to measure the effectiveness of reversible lane implementation and operation, and the reversible lanes have been implemented based on the experiential warrants rather than the study-based warrants. In this Paper the effect of reversible lanes operation has been analyzed by using the average delay and the fuel consumption. Four factors such as in and out flow of directional v/c, the ratio of directional volume, the number of reversible lanes and left-turn treatment(prohibition of LTs or protected LTs) were used to estimate the implementation effect of reversible lane operation by using TRANSYT-7F simulation package. In the case of six-lane urban arterial, the lower ratio of directional volume was found to warrant the reversible lanes when the simulation-based method was applied compared with the current experiential warrants.
An Analysis of Baggage Demand for Designing Baggage Handling System(BHS) (A Case Study of Incheon International Airport)
Bae, Byung-Uk ; Lee, Hong-Cheol ;
Journal of Korean Society of Transportation, volume 22, issue 1, 2004, Pages 19~30
Once baggage demand of passengers is forecast, BHS requirements must be analyzed, i.e., the number of originating/transferring/terminating bags to be handled, the number of conveyor lines to be installed, the number of containers for baggage make-up, the number of claim devices for baggage claim, and so on. Therefore, the determination of the baggage traffic volume is one of the most important analysis components for the airport design. Accordingly, this research proposes time-based distribution table models in order to accurately estimate BHS requirements to obtain design criteria in airport design phase. As the BHS requirements are ascertained, related requirements of the facilities can be determined by applying actual specifications of devices, i.e., throughput. This research found that the proposed mathematical model gives a good reflection of IIA (Incheon International Airport)'s operational condition. That means the model provides apparent reliability and feasibility. Furthermore, the specifications of devices are the newest figures. This fact supports that the research provides more effcient and reliable results.
Modelling the Subway Demand Estimation by Station Using the Multiple Regression Analysis by Category
Shon, Eui-Young ; Kwon, Byoung-Woo ; Lee, Man-Ho ;
Journal of Korean Society of Transportation, volume 22, issue 1, 2004, Pages 33~42
The subway demand by station increases by S-type curve after its operation. While the demand at its early time has been quite low the demand continuously increases and then reaches its maximum at the 10 to 13 years time. After the period, the demand is unchanged. The four-stage conventional model in estimating subway demand has not reflected the demand change by time so that its estimation results has been quite different from its real demand. The purpose of this study is to estimate the subway demand more realistically based upon Seoul subway lines 2 to 8 demand data by station, particularly boarding passengers excluding alighting and transferring passengers. The logistic function was selected since it showed subway demand changes by time properly. The location specific demand characteristics by station was reflected using several categories such as population, number of employees or students, and number of years after its operation were used as dependent variables of each category. As a result, the estimated demand proved quite realistic and statistically significance. Since the purpose of the study was to estimate more realistically boarding passengers by station, the model developed here cannot estimate alighting and transferring passengers by station. Hence, the model must incorporate the mostly used four-stage conventional model and the way to deal with was suggested here.
The Estimation Model of an Origin-Destination Matrix from Traffic Counts Using a Conjugate Gradient Method
Lee, Heon-Ju ; Lee, Seung-Jae ;
Journal of Korean Society of Transportation, volume 22, issue 1, 2004, Pages 43~62
Conventionally the estimation method of the origin-destination Matrix has been developed by implementing the expansion of sampled data obtained from roadside interview and household travel survey. In the survey process, the bigger the sample size is, the higher the level of limitation, due to taking time for an error test for a cost and a time. Estimating the O-D matrix from observed traffic count data has been applied as methods of over-coming this limitation, and a gradient model is known as one of the most popular techniques. However, in case of the gradient model, although it may be capable of minimizing the error between the observed and estimated traffic volumes, a prior O-D matrix structure cannot maintained exactly. That is to say, unwanted changes may be occurred. For this reason, this study adopts a conjugate gradient algorithm to take into account two factors: estimation of the O-D matrix from the conjugate gradient algorithm while reflecting the prior O-D matrix structure maintained. This development of the O-D matrix estimation model is to minimize the error between observed and estimated traffic volumes. This study validates the model using the simple network, and then applies it to a large scale network. There are several findings through the tests. First, as the consequence of consistency, it is apparent that the upper level of this model plays a key role by the internal relationship with lower level. Secondly, as the respect of estimation precision, the estimation error is lied within the tolerance interval. Furthermore, the structure of the estimated O-D matrix has not changed too much, and even still has conserved some attributes.
A study on Application of the Rate Quality Control Method of Over-dispersed Traffic Crash Data
Sung, Nak-Moon ;
Journal of Korean Society of Transportation, volume 22, issue 1, 2004, Pages 63~72
In conducting traffic safety programs, it is very important to identify hazardous sites in appropriate manner. The rate qualify control method is generally used in identifying hazardous sites since it can interpret the sites in the statistic aspects. The rate qualify control method is based on the assumption that the occurrences of traffic crashes follow the Poisson's distribution in which the expected value of traffic crashes equals the variance of those. However, there is greater variability than expected statistically, we call this phenomenon over dispersion. This study analyzed the problem related to the rate quality control method under the over dispersed data, and established a methodology to solve the problem. As a result of test on the basis of the field data, the new approach produced more reasonable results than those of the Poisson based rate quality control method.
An Analysis of Saturation Headway at Signalized Intersections by Using Fuzzy Inference
Kim, Kyung-Whan ; Ha, Man-Bok ; Kang, Duk-Ho ;
Journal of Korean Society of Transportation, volume 22, issue 1, 2004, Pages 73~82
Factors affecting the saturation headway at signalized intersections are classified as road, traffic, and environment conditions and the conditions affect the saturation headway compositely. The saturation flow rate of a certain lane group is estimated considering the adjustment factors of left or right turn, lane width, grade, and heavy vehicle to the basic saturation flow rate. Thus, among the factors affecting the saturation headway, the factors which is difficult to be presented as quantify that is, the factors having fuzzy characteristics are not considered. In this study, a model to estimate the saturation headway considering the qualitative factors by using the fuzzy approximate reasoning method is developed. For the input variables, the rainfall conditions, the degree of brightness and linguistic presentation of the heavy vehicle composition were used. The fuzzy membership function for each fuzzy set of those variables was constructed by interview survey. Based on the fuzzy sets, the saturation headways were observed for selected cases. Applying the observed results, the fuzzy control rules were constructed and a fuzzy inference model was developed. The model evaluation was performed by comparing the estimated saturation headways with the observed ones. As the result of analyzing the model with the statistics of coefficient of determination, mean absolute error and mean square error, the model was evaluated to explain the real situation well. In the process of this study, it was shown that the capacity reduction according to the rainfall became higher as the heavy vehicle composition became higher and the brightness became worse, and the rate of the reduction showed a broad range of 5.3% to 21.6%. The capacity reduction according to brightness was a range of 4.7% to 7.5%.
A Comparison Study of the Signal Systems in the Korean Road Traffic Law and the Convention on Road Signs and Signals
Jang, Kwon-Young ; Kim, Jin-Tae ; Lee, Jung-Youn ; Chang, Myung-Soon ;
Journal of Korean Society of Transportation, volume 22, issue 1, 2004, Pages 83~94
In 1968, United Nation prepared conventions to promote the safety and vitalization of traffic to accomodate increased international business and personal activities. They are convention on rad traffic and convention on road signs and signals. These conventions define the shape, color and the operational guidelines of signs, marking and traffic signals. However, the Korean road traffic law enforces independently the manufactural and operational guidelines of those devices and marking. Due to different regulations described in those two, potential problem might be expected in terms of international traffic in the near future in Korea. This paper presents the academical comparison between these two different road traffic regulations established by the Korean legislature and United Nation. It suggests a list of researches recommended for the nation to be ready to integrate international traffic.