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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
Sample Size Determination for O/D Estimation under Budget Constraint
Sin, Hui-Cheol ; Lee, Hyang-Suk ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 7~15
A large sample can Provide more information about the Population. As the sample size Increases, analysts will be more confident about the survey results. On the other hand, the costs for survey will increase in time and manpower. Therefore, determination of the sample size is a trade-off between the required accuracy and the cost. In addition, permitted error and significance level should be considered. Sample size determination in surveys for O/D estimation is also connected with confidence of survey result. However, the past methods were usually too simple to consider confidence. Therefore, a new method for O/D surveys was Proposed and it was accurate enough, but it has too large sample size when we have current budget constraint. In this research, several minimum sample size determination methods for origin-destination survey under budget constraint were proposed. Each method decreased sample size, but has its own advantages. Selection of the sample size will depend on the study Purpose and budget constraint.
Parameter Calibration of Car Following Models Using DGPS DATA
Kim, Eun-Yeong ; Lee, Cheong-Won ; Kim, Yong-Jin ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 17~27
Car following model is a theory that examines changes of condition and interrelationship of acceleration deceleration. headway, velocity and so on closely based on the hypothesis that the Posterior vehicle always follows the preceding vehicle. Car following mode) which is one of the research fields of microscopic traffic flow was first introduced in 1950s and was in active progress in 1960s. However, due to the limitation of data gathering the research depression was prominent for quite a while and then soon was able to tune back on track with development in global positioning system using satellite and generalization of computer use. Recently, there has been many research studies using reception materials of global Positioning system(GPS). Introducing GPS technology to traffic has made real time tracking of a vehicle position possible. Position information is sequential in terms of time and simultaneous measurement of several vehicles in continuous driving is also practicable. Above research was focused on judging whether it is feasible to overcome the following model research by adopting the GPS reception device that was restrictively proceeded due to the limitation of data gathering. For practical judgment, we measured the accuracy and confidence level of the GPS reception devices material by carrying out a practical experiment. Car following model is also being applied in simulations of traffic flow analysis, but due to the difficulty of estimating parameters the basis of the above result. it is our goal to produce an accurate calibration of car following model's parameters that is suitable in this domestic actuality
A Statistical Method for Predicting Recurrent Congestion Time in Urban Freeway
Han, Yeong-Jun ; Son, Bong-Su ; Kim, Won-Gil ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 29~37
As a recurrent congestion of urban freeway occurs in almost same time and section, it is possible to manage the congestion effectively by the expectation and advance correspondence. In the existing traffic management system. we have used pattern data to manage a recurrent congestion. But it is not applicable to an urban freeway which kas various traffic circumstance. In this study, the probability by travel speed using a statistical distribution method will be used to predict the probability of recurrent congestion. It is expected that we can get the point of time and the duration of recurrent congestion, and we can devise an effective advance correspondence and a transportation operation.
A Study on Traffic Flow Diagrams to Classify Traffic States of Incident Detection
Kim, Sang-Gu ; Kim, Yeong-Chun ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 39~50
This study aims to introduce a basic principle to improve the incident detection algorithm using traffic flow diagrams that can classify traffic states with a high reliability on the basis of the analysis of traffic flow characteristics under the recurrent or incident congestions. It is tried to newly classify the traffic states with the speed-flow and speed-occupancy diagrams. This is because McMaster algorithm has a tendancy on not identifying the traffic states exactly using the flow-occupancy diagram. In this study it shows that the classification of traffic states is applicable to use speed-occupancy relationship Therefore, it is necessary to determine some parameters to correctly classify the areas representing the traffic states and it may be possible to develop a new algorithm to detect the incident with a high reliability
A Performance Assessment of Urban Arterial Highway Interchanges
Lee, Ui-Eun ; Lee, Jae-Yong ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 51~61
Interchanges are passages for vehicle and pedestrians and a gateway to nearby facilities, and a place to stay of vehicle and Pedestrians. Interchange traffic must be able to navigate well for safety and convenience. Traffic safety and efficiency are influenced by the interchange. In this study, relative delays of vehicles are compared by changing traffic interchanges. the volume of traffic, the number of lanes, the rate of left turns vehicle on the interchanges of urban arterial roads. The object of this study is to compare Grade crossing interchange, Diamond interchange. Roundabout interchange. SPUI(Single Point Urban Interchange), Echelon interchange). Echelon interchange. By VISSIM Simulation, this study drew the relative delay value of every scenario and compared the delay value of each vehicle considering construction expenses. Through this comparison study, ideal interchange is dependent on the volume of traffic, the number of lanes, and the rate of left turns
Research on LOS Estimation Standard in the Mixed Traffic Street
Kim, Suk-Hui ; Kim, Gwan-Jung ; Choe, Gi-Ju ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 63~71
There were many theories to suggest the indicators that evaluate stability and reflect the plan in mixed traffic street in all traffic modes This Paper analyzed residential street of Suwon City adopting time-space occupancy index among these indicates. Three survey street. congregated into apartment house. were selected to analyze this and pictured by video camera over one hour. and the length of these street were 76m, 55m, and 34m each, and major street by each region, comparably high in Pedestrians and pass vehicles, were selected. Basic datum to calculate time-space occupancy index and time-space occupancy index per person was gathered through video analysis. i.e Parameters for pedestrians, cars, bicycles, average speed of bicycles, and parking car. There are some limitation to analyze LOS of mixed traffic street in all traffic modes, not pedestrian mall. Therefore this paper presented evaluation standard of LOS. In conclusion. the aim of this paper is to suggest modeling based on guidelines for evaluating LOS of mixed traffic street in all traffic modes. It is estimated that this will be influencing indicates for improving pedestrian environment, and Planning mixed traffic street in future.
Evaluation of Consciousness on Public Involvement of Road Project
Kim, Hyeon ; Gwon, Yeong-In ; Jeong, Byeong-Du ; Lee, Seon-Ha ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 73~83
In this study, our purpose is to identify a causal relationship in consciousness relating to the public involvement for current road improvement projects in Seoul Some of hypotheses about causal relationships among the psychological factors are assumed to develop a structural equation model. This model includes latent variables determining the consciousness relating to public involvement procedure, such as distrust feeling for administration (public sector) the knowledge and satisfaction about the road project, and the comprehensive faculty on the public involvement. The estimated model indicates that these assumed hypotheses are proved and that the administrative distrust strongly determines the consciousness as well as understanding of the road project and the knowledge of PI procedure.
Main Psychological Factors Contributing to Speeding
Sin, Yong-Gyun ; Ryu, Jun-Beom ; Gang, Su-Cheol ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 85~94
Speeding is a critical issue related to safety. It is one of violations which result in high fatality regarding the crashes causing the death. It is also affected by driver s variables such as sex, age, or mileage. However, these demographic variables cannot only explain fully the psychological mechanisms of speeding but also they are not helpful for the traffic safety education. Therefore, in our study, focusing on the theory of planned behavior (TPB), we explored the effects of attitudes toward speeding as well as subjective norms and perceived behavioral control on the intention and behaviors of speeding in which the demographic variables were controlled. Moreover, because speeding can be habitual without driver s intention, we did hierarchical regression on Past behaviors or habit as variables with ought, anger, and impulse as Predictable variables. The result showed that it was significant that TPB variables predicted intention and behavior of speeding. In addition. all additional variables excepting ought and anger showed the significant increment of the explained variance. Consequently, the limitations and implications for the intervention program of speeding were discussed.
Assessing the Safety Benefit of an Advanced Vehicular Technology for Protecting Pedestrian(Focused on Active Hood Lift System (AHLS))
O, Cheol ; Gang, Yeon-Su ; Kim, Beom-Il ; Kim, Won-Gyu ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 95~102
This study develops a methodology on how to assess the traffic safety benefit of advanced vehicular technology for Protecting pedestrian in pedestrian-vehicle collision. Safety benefit is defined here as the reduction of Pedestrian fatality by employing advanced vehicular technology. As an application of the proposed methodology the safety benefit of active hood lift system (AHLS) is assessed. Both actual accident data analysis and simulation experiment are conducted to establish statistical models that are used for estimating the reduction of pedestrian fatality It is believed that the developed methodology and outcomes would be greatly useful in developing various advanced vehicular technologies and establishing more effective traffic safety policies.
The Effects of in Vehicle Watching TV on Driver Behavior
Sin, Yong-Gyun ; Im, Pyeong-Nam ; Gang, Su-Cheol ; Ryu, Jun-Beom ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 103~112
For recent innovation of If technology and the beginning of Digital Multimedia Broadcasting (DMB) service, it has been dramatically increased to setup TV system in a car for watching TV and receiving traffic Information. Watching TV while driving would distract a driver s cognitive and visual attention as eating food, operating the radio, using a cell phone. However, there is paucity of empirical researches and it is uncertain how watching TV in driving impacts on the driver's cognition in the concrete. Therefore, we surveyed domestic drivers on the attitude watching TV while driving as well as conducted experiments through a driving simulator. Especially, we recruited two groups of participants to explore the effects of watching TV on driving behavior. The result proved that the participants who watched TV while their driving had relatively narrower the attention span than the Participants who did not watch TV. Also, those who watched TV drove with less stability and more urgent operations of the brake and accelerator than those who did not watched TV Finally, we discussed limitations and implications of the study.
The Impact of Traffic Safety Measures on Reducing Traffic Accidents
Myeong, Myo-Hui ; Kim, Gwang-Sik ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 113~123
This article evaluates the effects of eight traffic safety policies such as traffic accident reduction campaign, the seat belt law, three strike out driving while intoxicated, rewarding for reporting traffic offenders on the number of accidents and fatalities. Intervention analysis of time series is used to compare the monthly accident and fatalities with the before and after reinforcement. The results indicate that no significant impact of the traffic enforcement measures on reducing the number of accidents and fatalities.
Analysis of Streetscape Estimation Factor of User by KANSEI Engineering
Park, Sang-Myeong ; Lee, Byeong-Ju ; Nam, Gung-Mun ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 125~131
Recently, flowerbed median strips are being installed in urban highways for safety and scenery. In addition, efforts to enhance urban image through roadside flowerbeds and trees are being exerted for afforestation to enhance the urban environment. The sensibility of humans, such as the feeling of agreeableness of drivers must be considered when planning roads. However, not many researches on users on road environment are being conducted. Accordingly, KANSEI Engineering that is attracting attention nowadays was applied to form the image or sensibility of humans as definite object, in order to grasp the relation between the personal attributes of users and road formation with sensible factors considered when the road users evaluates the road scenery. As the result of research, streetscape was not evaluated based on individual factors such as roads, trees and buildings that form roads, but was based on sensibility image based on harmony of the overall road formation according to the changes of each factors.
Analysis of Airline Choice Factors with AHP(Analytic Hierarchy Process) (Focus on Domestic Airline)
Ha, Heon-Gu ; O, Se-Hun ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 133~142
The objective of this study is to analyze domestic air passengers' preferences for selecting domestic airline company. By the analytic hierarchy process(AHP) method, we tried to measure the weight of the qualitative factors objectively and scientifically. The overall results indicate that domestic air passengers place more weight on airport service factor than other service factors for selecting domestic airline. Also, reservation/ticketing and in-flight service factors are equivalent to airport service factor. These priorities are differently shown followed by passengers' income. Therefore, airline companies need to formulate the differentiated strategy and customer-oriented marketing plan based on identified customer needs.
An Analysis of the Cost Structure of Air Transport Industry(Deriving Economies of Density, Scale and Scope)
Kim, Min-Jeong ; Kim, Je-Cheol ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 143~153
This paper annually estimates the economies of density, scale and scope with the data of cost and output of 27 leading air carriers to suggest the political findings and strategies of raising the cost efficiency of our air transport industry. The estimation results and their implications are as follows. First, KAL and Aha would reduce their cost if they could increase international route density. Second, KAL and AAR would reduce their cost if they could expand the network but save their cost more effectively if they could increase international route density rather than expand the network. Third, the minimum efficient scale that minimize average cost of two national flag carriers which operate by the present output ratio among domestic passenger, international passenger and freight appears to be larger than each present output level of KAL and AAR. Meanwhile, it appears that minimum efficient scale of small size low cost carriers which operate domestic-oriented route is much smaller than minimum efficient scale of national flag carriers. Finally, it appears that there exists the diseconomies of scope between domestic passenger and the other outputs, that is, international passenger and freight and therefore save their cost if freight output ratio is higher and domestic passenger output ratio is lower than the Present level.
Analyzing Impacts of Telecommunications on Travel Using Structural Equation Modeling
Chu, Sang-Ho ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 157~165
The Purpose of this study is to analyze telecommunications impacts on travel in a comprehensive system, considering demand, supply, costs, and land use. This study first Presents a conceptual model, considering causal relationships among travel, telecommunications, land use, economic activity, and socio-demographics. Then, based on the conceptual model, the aggregate causal relationships between telecommunications (local telephone calls, toll calls, and mobile phone subscribers) and travel (vehicle-miles traveled and number of transit Passengers) are explored in a comprehensive framework, using structural equation modeling of national time series data spanning 1950-2000 in the U.S. The model results suggest that as telecommunications demand increases, travel demand increases, and vice versa. Additionally. transportation infrastructure and land use significantly affect travel demand.
A K Least Time Paths Searching Algorithm for Time Dependent Intermodal Transportation Networks with Departure Time Schedule Constraints
Jo, Jong-Seok ; Sin, Seong-Il ; Mun, Byeong-Seop ; Im, Gang-Won ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 167~176
An minimum path algorithm for integrated networks with departure time constraints require considering arrival time of arriving mode, transfer time. waiting time, and departure time of next mode. Integrated network with diverse modes commonly include departure time constraints. Because public mode suck as train and airplane have fixed service schedule which provide passengers. This study developed the k-path algorithm in integrated network with time varying conditions and departure time constraints. We proposed the extended method based on entire path deletion method, and examined the application of the proposed algorithm through case study
A Multi-path Search Algorithm for Multi-purpose Activities
Jeong, Yeon-Jeong ; Kim, Chang-Ho ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 177~187
It is known that over one million car navigation devices are being currently used in Korea. Most. if not all, route guidance systems, however, Provide only one "best" route to users, not providing any options for various types of users to select. The current practice dose not consider each individual's different preferences. These days, a vast amount of information became available due to the rapid development in information processing technology. Thus, users Prefer choices to be given and like to select the one that suits him/her the "best" among available information. To provide such options in this Paper, we developed an algorithm that provides alternative routes that may not the "least cost" ones, but ones that are close to the "least cost" routes for users to select. The algorithm developed and introduced in the paper utilizes a link-based search method, rather than the traditional node-based search method. The link-based algorithm can still utilize the existing transportation network without any modifications, and yet enables to provide flexible route guidance to meet the various needs of users by allowing transfer to other modes and/or restricting left turns. The algorithm developed has been applied to a toy network and demonstrated successful implementation of the multi-path search algorithm for multi-purpose activities.
Identifying Key Factors to Affect Vehicle Inspection and Maintenance(I/M) Test Results Using a Binary Logit Model (California Case Study)
Chu, Sang-Ho ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 189~195
For the past decades, vehicle emissions has been a major source of air pollution in urban areas Vehicle inspection and maintenance (I/M) test programs were developed for major metropolitan areas to reduce urban air pollution. However. there are a few studies of exploring major factors to influence I/M test failure. This study develops a logit model to identify key factors affecting overall test failure, using the vehicle I/M test data from California in October 2002. The model results indicate that vehicle age, odometer reading, engine size, vehicle make, presences of emissions control equipment, and test types have significant effects on the probability of I/M test failure.
Suggesting a Demand Forecasting Technique Explicitly Considering Transfers In Light Rail Transit Protect Analysis
Kim, Ik-Gi ; Han, Geun-Su ; Bang, Hyeong-Jun ;
Journal of Korean Society of Transportation, volume 24, issue 3, 2006, Pages 197~205
The study suggested a demand forecasting method which explicitly reflects transfer between various transport modes especially related light rail transit project with multi-modal transit system. The suggested method classifies several groups depending on characteristic of trips and applies different demand model for each group to explain travel pattern more realistically More specifically. the trips was classified by trips within the LRT route, trips between inside and outside of the LRT route. and through trips via the LRT route. The study also suggested a evaluation measurement of time saving due to the LRT construction, which are consistent along with the do-case and the do-nothing-case even though some mode shift could be happen after introducing the LRT.