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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 24, Issue 7 - Dec 2006
Volume 24, Issue 6 - Oct 2006
Volume 24, Issue 5 - Aug 2006
Volume 24, Issue 4 - Jun 2006
Volume 24, Issue 3 - May 2006
Volume 24, Issue 2 - Apr 2006
Volume 24, Issue 1 - Feb 2006
Selecting the target year
Landscape Preference over Single-Spaned Steel Box Girder Bridge by Bridge Shape Parameters
Kim, Rak-Gi ; Geum, Gi-Jeong ; Yang, Gye-Seung ; Im, Seong-Bin ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 7~18
The Purpose of this study is to develop landscape Preference and define elements of difference in landscape preference of the 1-span Steel Box Girder Bridge by Bridge Shape Parameters(BSP) through Design of Experiments. Lately, the 1-span Steel Box Girder Bridge is dominations much component ratio and the Steel Box Girder Bridge has strong Points that is economically Profitable and management has easy when construct. but landscape preference of the 1-span Steel Box Girder Bridge was evaluated low because impression of landscape is being surfeited and dulled. Do to consider optimization in design that give change to Bridge Shape Parameters(BSP) to supplement this shortcoming in this study. Therefore, this study changes Bridge Shape Parameters(BSP) and extract elements that influence in landscape preference of the 1-span Steel Box Girder Bridge. and based on the design that consider landscape Preference of the 1-span Steel Box Girder Bridge, some essential guidelines for rational design of the 1-span Steel Box Girder Bridge suggested.
A Study for Optimized Detecter Location Considering the Traffic Characteristics in National Highway
Byeon, Sang-Cheol ; Lee, Seung-Jae ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 19~30
This study deals with the optimized detector location considering the traffic characteristics in National Highway. Although there ave many construction works for ITS in National Highway, there is not specific criteria for detector location which can effect the accuracy of traffic information. This study. therefore. aims to Provide the optimized detector location criteria which can represent the traffic characteristics of National Highway. It collects traffic factors of study area by GPS Probe-car and defector, and Presents the optimized detector location by the correlation analysis between spot-speed and link-travel-time. The main results of this study are as followings ; First, the correlation between the spot-speed and link-travel-time Presents the opposite bell shape of the graph (U-type owe) which is increased it?on the upstream then, declined through some unspecified Point of the link. Second, the optimized detector location usually distributes around midstream of link, even though it does not have a consistency. Third, therefore, the optimized detector location generally should be located between
of total link length. Forth. high level of vertical slope is one of the most important factors of detector location, so it should be excluded for determination of optimized detector location. Finally, expecting that the results of this study would improve the accuracy of travel time estimation and forecasting.
An Estimation of Congestion Pricing Using Speed-Flow Relationship (Gangbyeon Expressway)
Gang, Gyeong-U ; Guk, U-Gak ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 31~41
The main purpose of this paper is to develop the practical method to estimate the congestion price in odor to overcome the difficulty of traditional microeconomics approach for demand and cost function concepts. In this paper, we estimate the theoretical congestion toll which reflecting the real traffic conditions such as a speed-density functions using a traffic engineering methods We calculates the optimal congestion toll based on the real traffic conditions assuming that the electronic road pricing (ERP) systems ave installed for the study road. After evaluating the various speed-density relationship methods. we found that the Drake model is best suited for the Gangbyeon Expressway Using the Drake model, the optimal congestion toll will be 94 to 3,255 Won for the traffic speed between 44km/h to 68 km/h based on wage rate method and 107 to 6,381 Won for the marginal substitution method for the Gangbyeon Expressway in city of Seoul, Korea.
Investigating the Antecedents of Air Passengers' Behavioural Intentions
Park, Jin-U ; Choe, Yeon-Cheol ; Yu, Gwang-Ui ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 43~51
This Paper investigates how perceived Price, airline service aquality, perceived value. passenger satisfaction, and airline image determine passengers' future behavioural intentions. To test the conceptual framework, Path analysis using a maximum likelihood estimator, was applied to data collected from Korean international air passengers. It was found that all the hypothesized relationships were statistically significant. Perceived price. Perceived value, passenger satisfaction, and airline image were each found to Have a direct effect on Korean international air passengers future behavioural intentions.
Estimation of Korea Transportation Service Index and Business Cycle Analysis
Han, Sang-Yong ; Jeong, Gyeong-Ok ; Jeong, Gyeong-Min ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 53~63
The objective of this study is to estimate Korean transportation service index (KTSI), and to explore possible uses of the KTSI. The KTSI was monthly index to represent the level of passenger and freight services by road, railroad, air and maritime modes, which was developed from eight series. Four of these series measure the level of passenger services (passenger-kilometers) by road, railroad. air and maritime modes : monthly data from January 1995 to December 2004. Similarly. the remaining four series measure the level or freight activity (tonnage) by four modes during the same period. Given the weights of modal revenues, component series were aggregated into two indexes (passenger index and freight index) and a composite index using Chained Fisher Ideal index. which was a geometric mean of the Laspeyres index and the Passche index. The Fisher Ideal index is one of the 'superlative' indexes, which diminish 'substitution bias' as current-weighted indexes. As a result, the freight index and the composite index explain economic conditions better than the passenger index. Based on the composite index. the newly estimated KTSI shows an average lag time of one and a half years at peaks and three months at troughs in comparison with domestic business cycles. Nonetheless. the following efforts are needed for more credible and useful estimates; establishment of data collection scheme in time. credibility uplift of used data, development of various indexation methods.
The Analysis of Cost Structure and Productivity in the Korea and Japan Railroad Industry
Park, Jin-Gyeong ; Kim, Seong-Su ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 65~78
This paper investigates the cost structure ot the Korea and Japan railroad industry with respect to density, scale and scope economies as well as productivity growth rate using a generalized trans)og multiproduct cost function model. The paper then assumes that the Korea and Japan railway companies pi·educe three outputs (incumbent railway passenger-kilometers. Shinkansen passenger-kilometers, ton-kilometers of freight) using four input factors (labor, fuel, maintenance, rolling stock and capital). The specified cost function includes foul other independent variables: track lengths to reflect network effects, two dummies to reflect nation and ownership effects, and time trend as a proxy for technical change. The simultaneous equation system consisting of a cost function and three input share equations is estimated with the Zellner's iterative seemingly unrelated regression. The unbalanced panel data used in the paper, a total of 154 observations. are collected from the annual records of the Korea National Railroad (KNR) for the yews
, Japan National Railways (JNR) for the years
. seven Japan Railways (JR's) for the years
. The findings show that the Korean and Japanese railways exhibit product-specific and overall economies of density but product-specific diseconomies of scale with respect to incumbent railway passenger-kilometers, Shinkansen-kilometers and ton-kilometers. However, the railways experience mild overall economies of scale which result from economies of scope associated with the joint production of incumbent railway/Shinkansen and feight, freight/incumbent railway and Shinkansen except Shinkansen/incumbent railway and freight. In addition, the economies of density and scale in the KNR, JR east, JR central, and JR west companies at the point of the years
average is generally analogous to the above results at the point of sample average. There also appear to be economies of ssope associated with the joint Production of the incumbent railway and Shinkansen in JR central but diseconomies of scope in JR East and JR West. The findings also indicate that the productivity growth rate of the privately-owned JR's is larger than that of the government-owned KNR.
A Study on the Superelevation Measuring Accuracy using GPS-lNS Integrated System
Jeong, Dong-Hun ; Yun, Deok-Geun ; Seong, Jeong-Gon ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 79~89
The purpose of this study is to propose a new method using the GPS-INS integrated system which measures the superelevation of a curved yoad rapidly and safely Also, using the CPS-INS integrated system. this Paper is to analyze the expected accuracy of the superelevation on the roads which are already opened for traffic. The superelevation of the roads which are already opened for traffic often changes by roads rehabilitation work such as resurfacing of Pavement and rutting However, it is difficult to measure 1,he changes of road geometry because or the high cost and the safety problem. If the measurement of superelevation using GPS-INS integrated system is used instead of existing conventional surveying method, the superelevation of road is expected to be measured accurately(under 0.4% RMSE) just by driving without interfering the traffic Therefore, the application of the GPS-INS integrated system is expected to be useful tool for measuring the superelevation of the roads.
The Situation and the Tasks of UK Rail Privatization, Focusing on after the Hatfield Accident
Lee, Yong-Sang ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 91~100
This paper examines the situation and tasks of UK rail privatization, especially focusing on after the Hatfield rail accident. Earlier research which focused on the UK's Privatization had little knowledge of the explanations for recent changes. Moreover they had difficulty making a direct comparison between national rail and the privatized rail. Therefore we aye left without a good explanation which has a comprehensive perspective. I attempt to show the change in the rail privatization Process and its outcome, focusing on after the Hatfield rail accident. This Paper argues that the UK's vail privatization process has a regulatory framework which is too complicated with overlapping responsibilities that brought about inefficiency, increasing costs and a superficial safety regime. Especially the planning of rail and infrastructure maintenance did not come to play an appropriate role. However after 2000, the government took charge of setting the strategy for railways, and the Office of Rail Regulation covered safety performance and cost. explain that these changes present a good opportunity to solve the problem of passing the buck for poor performance. Through the analysis, I find that the passenger rail network is well-suited to deliver long distance business and commuters and that the subsidy from the government is decreasing. However, performance, for example punctuality and reliability. should be improved. Especially the Hatfield rail accident caused a reduction in the satisfaction of passengers. In future. the problems of rising costs and monopoly franchise system should be addressed.
Evaluation of The Highway Design Speed Determination Process Using Case Studies (Reclassifying Functions and Terrain Types)
Sim, Gwan-Bo ; Choe, Jae-Seong ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 101~112
Currently, highway design speed is determined by considering highway function, area type, and terrain type. Sometime it is pointed out that determining a reasonable design speed which is both efficient and safe is not an easy task and that Practicing engineers often select an unsuitable design speed on purpose, capitalizing on some ambiguous and discretionary expressions in describing the highway design speed. This undesirable Problem is arising mostly due to the fact, that the current geometric design standard fails to include rolling terrain type and can not reflect the whole characteristics of land use patterns adjacent to the design highway route. A recent research was Published considering this problem and it attempted to improve the highway design speed determining process. In this research Project, tn see the effects of this recently developed procedure, a new and reduced design speed was calculated based on the new Procedure and subsequently another highway design route was selected. The travel time. construction cost. and the expected degree of safety associated with the new route were assessed to be compared with the ones with the existing procedure. As a result. it was found that the new procedure was successful in reflecting the localities such as terrain type and area type into better determining highway design speed, eliminating much of highway engineers' discretion when applying engineering judgments. Also the new Procedure is keen to produce a more economical highway project. In other words, despite of producing reduced amount of user benefits accrued, in the new highway route, the construction cost has been cut significantly leading to higher values in B/C. NPV, and IRR. Also EMME-II output, which Provided the link assigned volumes, rendered only a slightly reduced Levels of Service along surrounding links in the study network. This reduction was believed to occur because of lower design speed and it had been expected from the beginning.
Accident Conversion Effect Analysis of Installing Median Barriers
Park, Min-Ho ; Park, Gyu-Yeong ; Jang, Il-Jun ; Lee, Su-Beom ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 113~124
Among tile traffic safety facilities, median barriers are installed above 4-lane national roads due to the awareness of haying an effect on preventing the front collision. Studies about the installation effect analysis of median harrier have been carried out through both at home and outside, mainly indicating total accident reduction effect on pertinent sections. In sum, study about how the accident occurrence form is changed at the point classified by the accident type or severity is insignificant. In the case of outside the country, calculating the accident reduction effect according to the type of median barriers is main research and in domestic, though there is a part of researches assessing reduction effect by accident types, it is not reliable in the view or statistics because of using only 1year's before-aftev data installing the facility, So in this Paper. it is the main purpose to presume the accident conversion effect. For this, we conduct an investigation and collect data about 7-year's accident data containing before-after Project, safety facilities foundation records and index of road alignment on the subject of 4-1ane national roads(108.6km) existing median barrier. Next. using the empirical bayes method, we estimate a model construction and accident conversion effect of accident type severity. We expect the result or this Paper will be applied for a policy execution and Presentation of facility standard related to median barrier from now on.
An Incident Detection Method for Using Speed-Density Relations
Lee, Seon-Ha ; An, U-Yeong ; Gang, Hui-Chan ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 127~137
This Paper Presents a novel incident detection method for using the speed-density difference between detectors. When a incident is happened the downstream traffic condition is mostly lower speed and higher density and the upstream is higher speed and lower density In respect of such characteristics, we can suggest a method for detecting an incident based on the speed-density information provided from detectors. The incident detection method is tested by using the accident data collected from the Cheonan-Nonsan Highway. The results show that suck an incident detection method can analyze the position of accident by comparing the speed-density difference between detectors. The work described in this paper is only at on early stage, in the sense that there are several areas to be further investigated in application of this method. such as setting a critical value for judging the incident. a level of accident wave, a varying Pattern between the incident locations and detectors, etc.
Development of Pedestrian Fatality Model using Bayesian-Based Neural Network
O, Cheol ; Gang, Yeon-Su ; Kim, Beom-Il ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 139~145
This paper develops pedestrian fatality models capable of producing the probability of pedestrian fatality in collision between vehicles and pedestrians. Probabilistic neural network (PNN) and binary logistic regression (BLR) ave employed in modeling pedestrian fatality pedestrian age, vehicle type, and collision speed obtained from reconstructing collected accidents are used as independent variables in fatality models. One of the nice features of this study is that an iterative sampling technique is used to construct various training and test datasets for the purpose of better performance comparison Statistical comparison considering the variation of model Performances is conducted. The results show that the PNN-based fatality model outperforms the BLR-based model. The models developed in this study that allow us to predict the pedestrian fatality would be useful tools for supporting the derivation of various safety Policies and technologies to enhance Pedestrian safety
Development of Station Dwelling Time Estimation Model for Seoul Metro Line No. 4
Park, Jeong-Su ; Sin, Dong-Hui ; Won, Je-Mu ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 147~156
Metropolitan Subway, tke volume of station, distance between station is short. when the demand is concentrated during moving peak periods, the Headway that than Line Headway in which Station Headway is applied to Station Capacity computation be. The factors to determine the Station Headway have a fixing Price of the machine and the Dwell time. Other factors aye decided already or fixing price but the Dwell time that change according to demand cause the biggest effect at Station Headway. After analyze constituents that influence to Station Headway in this study calculated correct Station Capacity drawing estimating dwell time model that change according to demand
On-Line Departure time based link travel time estimation using Spatial Detection System
Kim, Jae-Jin ; No, Jeong-Hyeon ; Park, Dong-Ju ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 157~168
Spatial detection system such as AVI, GPS, and Beacon etc. can provide spatial travel time only after a vehicle Passes through a road section. In this context, majority of the existing studies on the link travel time estimation area has focused on the arrival time-based link travel time estimation. rather than departure time-based link travel time estimation. Even if some of the researches on this area have developed departure time-based link travel time estimation algorithms, they are limited in that they are not applicable in a real-time mode. The objective of this study is to develop an departure time-based link travel time estimation algorithm which is applicable in a real-tine mode. Firstly, this study discussed the tradeoff between accuracy and timeliness of the departure time-based on-line link travel time estimates. Secondly, this study developed an departure time-based on-line link travel time estimation algorithm which utilizes the Baysian inference logic. It was found that the proposed approach could estimate departure time-based link travel times in a real-time context with an acceptable accuracy and timeliness.
A Solution Algorithm for Elastic Demand Traffic Assignment Model Based on Dynamic Process
Im, Yong-Taek ; Kim, Hyeon-Myeong ;
Journal of Korean Society of Transportation, volume 24, issue 2, 2006, Pages 169~178
Traffic assignment has been used both for predicting travel demands and for evaluating the tools for alleviating congestion on road network in advance. Some assignment models have been proposed such as equivalent mathematical minimization method, variational inequality problem, nonlinear complementary problem and fixed point method, in following the principle of Wardrop (1952) that no driver can not Improve his travel cost by unilaterally changing his route. Recently Jin(2005a) presented a traffic assignment model based on dynamic process. This paper proposes a solution algorithm for the model of Jin and assesses the performances. Compared to the Frank-Wolfe method, which has been wildly used for solving the existing assignment models, the proposed algorithm is expected to be more efficient because it does not need to evaluate the objective function. Two numerical examples are used for assessing the algorithm, and they show that the algorithm converges to user equilibrium of Wardrop.