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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 19, Issue 6 - Dec 2001
Volume 19, Issue 5 - Oct 2001
Volume 19, Issue 4 - Aug 2001
Volume 19, Issue 3 - Jun 2001
Volume 19, Issue 2 - Apr 2001
Volume 19, Issue 1 - Feb 2001
Selecting the target year
The Impact of Aviation Safety over the Consumer's Behavior
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 7~19
The research purpose for The Impact of Aviation Safety over the Consumer's Behavior in Korea lies at the judgement that airline consumers' selection criteria has much changed after several serious aviation accidents as before when we used to overlook "aviation safety" variable through surveying to Korean aviation consumers and foreigners visit or travel Korea on various purposes. Therefore, for this research, practical analysis methods are employed after surveying to actual passengers who use Kimpo International Airport's international and domestic terminals. This study will be regarded significant in terms that empirical analysis was used to prove "Aviation Safety", a variable which had not been regarded as a airline choice factor within Korea air transport market so far, and has an effect on the aviation consumers' airline preference change and choice after recent frequent aviation accidents. Presenting this dissertation, I wish. it can be another opportunity for Korean two national flag airlines to reappraise and reinforce the significance of "aviation safety" and set forth immediate vigorous efforts to support the government's aviation safety improvement countermeasures. I hope the study to contribute and provide a variable idea and direction to improve aviation safety management of two Korean flag carriers.
Estimation of the Through Car Equivalent for Left-Turn Movement According to the Left-Turn Curve Radius in the Signalized Intersection
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 21~28
This study is to estimate the through car equivalent for left-turn movement according to left turn radius in the signalized intersection. The saturation flow rate for left-turn movement in 92' KHCM(Korea Highway Capacity Manual) is the same as that for through movement in the signalized intersection where the left turn radius is over 20m. This study uses Duncan 'Test's Test in order to find out the saturated position for queued vehicle in the signalized intersection. It found that the saturated flow rate of left-turn movement in the signalized intersection is less than that of through movement where the left-turn radius is less than 20m. It found that the through car equivalents for left-turn movement according to left-turn radius(8m-20m) are between 1.05 and 1.14.
A Case Study on the Improvement of Container Transportation Systems in Busan Port
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 29~40
Travel Demand Estimation using Traffic Counts on the Large Scale Network
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 43~52
Conventionally, travel demand estimation methods using traffic counts have been applied on a relatively small- and medium-scale hypothetical transport networks. In doing that, the demand has to be assumed in order to estimate the predicted O/D matrix. Meanwhile, the predicted O/D is compared with the base O/D so that the reliability of the predicted demand is measured mainly by using statistical methods. However, assessing the reliability of the predicted O/D matrix in the real situation. i.e. a large-scale network, is almost impossible without having observed true O/D matrix. In this research, a model that could be applied to a large-scale network has been reviewed and developed by using real and practical demand data, i.e. the data from 1996 travel census of Seoul, instead of assumed data. The O/D matrix that has been estimated by the multi-class based model has been compared with that from the conventional model so that the reliability of the prediction can be assessed by applying TLFD(trip length frequency distribution) concept. At the same time, the
has been used in order to measure the prediction capability of the model by comparing observed and predicted demands before and after the application of the model. The result shows that the multi-class based model gives more plausible result than the conventional model especially on a large-scale network.
Study on Multi-modal Transit Network Assignment with Dial Algorithm
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 53~60
The purpose of the study is to suggest a stochastic transit assignment technique by applying Dial's algorithm to multi-modal transit network. Then, the suggested algorithm was tested to identify its properties. This technique actually analyze the mode choice and route choice simultaneously by considering transferring between different lines or different modes in multi-modal transit network. The Dial's algorithm, which is a link-based stochastic assignment technique, is based on the logit mode that is a discrete choice model. Therefore, it has same properties of logit model. It can also account for choice behavior like transit mode choice and route choice behavior among multiple transit modes within context of utility maximization theory. Deterministic transit assignment (All-or-Nothing assignment) model allocates all trips to the shortest path for each O-D pair Therefore, the result of all-or-nothing transit assignment analysis cannot represent realistically traveler's behavior in mode and route choice especially within complex multi-modal transit network. The revised Dial's algorithm for transit assignment, which was proposed in this study, can overcome such shortages of existing deterministic transit assignment models. A simple transit network of Sioux Falls is used for the simulation in order to identify attributes of the algorithm and to compare the results with ones of other commercial computer programs such as TRANPLAN and EMME/2. The analysis concludes that the suggested technique is more flexible in representing traveler's behaviors. Therefore, it is considered to be a better technique for analyzing multi-modal transit travel pattern in real world than existing other models. Especially, the technique is considered to be more appropriate than others for transit policy analysis in very complex multi-modal network like Seoul metropolitan area.
Multi vehicle OD trip matrix estimation from traffic counts
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 61~72
The previous OD matrix estimations from link traffic counts use one vehicle type only, despite it is possible to obtain link flow easily by individual vehicle types. Therefore those methods use a deteriorated information and decrease the performance of OD matrix estimator This paper is the revised research of rnultiple-vehicle OD matrix estimation problem, which comes from Lim et al. (2000) that estimated OD matrix from link counts using genetic algorithm(GA) for the corridor and from Baek et al. (2001) that applied the method to urban network. The main purpose of this paper is that we show the performance of previous OD matrix estimation methods is deteriorated due to using one-vehicle type and suggested alternative method to overcome that problem. We suggest that multiple-vehicle OD matrix estimation from link counts using GA (GWC) and compare the method with previous method such as Iterative Estimation Assignment (IEA) algorithm. We also use the new concept of OD matrix structure to show the previous method's dependancy on target OD matrix and to investigate the performances of our matrix structure is changed. Numerical examples show that the performance of GAMUC is better than that of the previous methods for the error of target OD matrix and of link counts. And the previous OD matrix estimation method may produce OD matrix structure which is different to that of true OD matrix.
Development of an Incident Detection Algorithm for Urban Street
Lee, Yeong In ; Hwang, Jun Hwan ;
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 73~73
Adjustment Factor for Heavy Vehicles in Estimating Capacity at Unsignalized Intersections
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 89~98
The objective of this Paper is to derive an adjustment factor for the presence of heavy vehicles when estimating capacity at unsignalized intersections (and/or at modern roundabouts). According to the 1997 and 2000 Highway Capacity Manual (HCM), potential capacity in such cases is estimated by simply adjusting base critical gap and base follow-up time. However, the procedure suggested in the HCM may lead to some errors in the adjustment, hence resulting in poor evaluation and design for the intersections, because it determines the value of adjusting factors by only the number of lanes on main streets regardless of the types of heavy vehicles. This paper shows a simple formula for making the adjustment. This formula is much like the HCM formula used for heavy vehicles in estimating highway capacity by the adoption of passenger car units (PCU). In contrast to the traditional approaches seen in the HCM, the PCU value of this case is explicitly expressed by the flow rate in the major streams and the gap difference in critical gaps chosen by passenger cars and particular heavy vehicles. Computational results of the adjustment factor are graphically illustrated.
A Study on Congested Flow through Time-Space Analysis of Traffic Flow
Journal of Korean Society of Transportation, volume 19, issue 2, 2001, Pages 107~107