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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 23, Issue 8 - Dec 2005
Volume 23, Issue 7 - Dec 2005
Volume 23, Issue 6 - Oct 2005
Volume 23, Issue 4 - Sep 2005
Volume 23, Issue 5 - Aug 2005
Volume 23, Issue 3 - Jun 2005
Volume 23, Issue 2 - Jan 2005
Volume 23, Issue 1 - Jan 2005
Selecting the target year
Estimation of Willingness-To-Pay for Extensive Implementation of Congestion Pricing
Kim, Gun-Young ; Han, Sang-Yong ; Kang, Kyung-Woo ; Kim, Tae-Seung ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 7~14
Traffic congestion causes enormous social costs as well as loss of travel time and waste of energy. Though the Seoul metropolitan government implemented various forms of transportation policies such as urban road pricing and public transportation reform, traffic volume which across the Seoul metropolitan borders have greatly increased because of housing land development in suburban area. The purpose of this study is to estimate individual's willingness-to-pay(WTP) for extensive implementation of congestion pricing through policy-mix with bus rapid transit(BRT) system. So the field survey interviews carried out. The empirical analysis was done with priority given to the following two topics; derivation of individual WTP and prior evaluation of policy effect from the equity aspect. To estimate individual WTP, we adopted contingent valuation method (CVM). The former is to estimate individual WTP for respondent's maintaining his/her transit pattern when he/she is faced with congestion pricing by using compensating variation(CV) concept. And, the latter aims at evaluating policy effect from the equity aspect by calculating the Proportion of WTP to average income using WTP in income bracket for policy scenarios.
An Analysis on the Efficiency and Productivity of Korean Rail Transit Authorities Using a Stochastic Cost Frontier Approach (A Comparison with the Estimation Results by DEA)
Kim, Min-Jung ; Kim, Sung-Soo ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 15~25
Using a stochastic cost frontier approach(SCFA), this paper annually estimates the efficiency and productivity with same data in the papers which analyze the efficiency and productivity using data envelopment analysis(DEA) to compare the results and suggest the political findings of raising the efficiency and productivity for three publicly-owned rail transit properties. the Seoul Subway Corporation (SSC), the Seoul Metropolitan Electrified Railways Sector of Korea National Railroad (SMESRS) and the Busan Urban Transit Authority (BUTA). The results show that the results of SCFA are higher than DEA for efficiency and lower for productivity in that DEA regards the stochastic error and measurement error as the inefficiency contrary to SFCA. But the political findings from these results appears to be similar as follows. First, the productivity of the three properties should be first improved by using existing technologies efficiently and then by introducing new ones. Second, the three properties should improve the technical efficiency through reducing input quantities to raise their efficiency. Finally, all the three components of the productivity such as productive efficiency change, technical change, and scale change should be considered to evaluate their productivity more correctly.
A Scheme of Crisis Management for National Aviation Safety
Kim, Yeon-Myung ; Hong, Seok-Jin ; An, Hyuck-Soo ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 27~34
To develop a crisis management for aviation safety, this study has defined crisis management includes risk management which is eliminates or lowers risks prior to accidents and emergency response after the accidents. A risk management model was developed through wide surveys for aviation hazards including aircraft operation, ATC, and airport operation, etc. The crisis management could not be effective by only using a pre-active risk management. It should also conduct using a pro-active response system. In addition, this study also suggested schemes of development for national emergency response through case studies of aircraft accidents.
A Study on the Installation of the Automated Speed Enforcement Camera for the Effectiveness
Kim, Yong-Seok ; Cho, Won-Bum ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 35~45
The speed enforcement camera has been regarded as one of the most important safety countermeasures. Drivers decelerate in front of the speed enforcement camera and gain speed up after passing the camera. So there is a strong need to develop the method how to place the camera to overcome this problem. This study applied the concept of design consistency to the installation of the camera, so speed difference along the road sections should be controlled within the predetermined boundary. Specially, this study also regarded camera as the one of the elements of the road alignments which can change the speed of drivers abruptly, and suggested the way to put this concept into the selection of the placement of the camera.
Building up User-Oriented Road Planning and Design Schemes
Kim, Eung-Cheol ; Kwon, Young-In ; Yun, Seong-Soon ; Kang, Jin-Goo ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 47~55
Roads deeply affect the life of people and keep doing an important role to support economic growth of a country. According to the budget plan of the ministry of construction and transportation of Korea, 8.1 trillion won have been allotted for road investment in the year of 2002 which occupy 61% of the transportation infrastructure special account (13.3 trillion won) and 4.7% of the total national budget (1,740 trillion won). It is true that services generated from road investment such as mobility enhancement and increased accessibility have shown positive effects through shortened travel time and decreased vehicle operating cost. However, it is also notable that many negative effects are gradually being discussed and those are nowadays getting severer due to enhanced people interests about road construction, increased concerns on environment and active public involvement that were evoked by traffic accidents, air pollution & noise and destruction of environment. Road construction processes in Korea are normally governed by administrative sectors (suppliers) not by users. These processes ate very weak to accomodate user s needs and community concerns thus easy to fail finalizing a road project without hassles. A public hearing process is supposed to be held in the processes of detailed design step and the environmental impact analysis. However, it is not enough to grab user's needs and community concerns. Increased public involvement frequencies, optimized public involvement timing and enhanced depth of public involvement magnitude are suggested to improve the current poor public involvement schemes in road planning and design processes. The application of these recommended methods to the road planning and design processes may guarantee the change from the current supplier-oriented schemes to the new user-oriented one. Also, this study suggests to reset objectivity and clarity of road construction process, to make conciliation guidelines based on many practical cases that produced good results, to introduce public involvement techniques in a stepwise basis, and to foster the professionals via education and training programs.
Overview of PI Systems in the United States and its Application to Korea
Kim, Tae-Wan ; Yun, Seong-Soon ; Kwon, Young-In ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 57~64
Recently, several national construction projects such as Chunsung Mt. section of Kyungbu High Speed Rail or Sapae Tunnel of Seoul Outer Ring Road have been delayed or suspended due to the objections of residents or environmental organizations. Considering the development of democracy, increased public participation and interests on environmental issues in Korea, the generation of these social conflicts may be natural phenomenon. However, it is necessary to find measures to effectively implement major construction project and save costs related to social conflicts. In this paper, PI techniques in the United States are investigated and in comparison, the weakness and improvement plans for Korea's current public participation system have been suggested.
Estimation of Area Type for Logistics Planning
Yun, Seong-Soon ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 65~71
Area type is often used in freight demand analysis and logistics planning models. For example, in freight transportation planning. area type variable is most often commonly used in freight generation (attraction) model. Yet a reliable, forecastable and measurable definition or area type is generally not documented. In fact, there is little literature on the subject of predicting area type in the context of freight planning models. This can be troublesome when applying models to long-range logistics planning where significant changes in population and employment result in changes in the general character of an area. Through the use of Discriminant Model, GIS (Geographic Information System) analysis and Delphi methods, this paper presents the successful exploration for a quantifiable means of determining area type.
Design of Drop Island to Accommodate the Turning Trajectory of Semi-Trailer
Lee, Suk-Ki ; Kim, Jong-Min ; Noh, Kwan-Sub ; Kim, Yong-Seok ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 73~81
Triangle-shaped island was been used for the exclusive separation between the right-turn and the through flow. However, in case that existing Triangle-Shaped Island is built at the intersection of narrow road. there are more possibilities of traffic collision trespassing into the opposite lane. Accordingly, separation of the opposite lane is required so as to prevent the intrusion of the large-sized (a heavy) vehicle into the opposite lane turning at the intersection. This study showed the comparison between intersection composed of existing Triangle-Shaped Island and the intersection with Drop Island is added. First of all, in the safety aspect, a method to decide location and shape of Drop Island considering turning trajectory of the large-sized (the heavy vehicle) is addressed. The guideline on the placement of drop island install location and method to decide form the consider heavy truck's turn trajectory in safety side. As a conclusion. we analyzed that drop island is relatively superior to existing Triangle-Shaped Island in terms of driver, ease of driving, driving pleasantness, pedestrian, widening and economic performance aspect.
Median Arterial Bus Lane Operation Analysis Using the Downs-Thomson Paradox Theory
Lee, Seung-Jae ; Ryu, Seung-Kyu ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 83~92
The purpose of the paper is to analyze an effectiveness before and after implementation of the median arterial bus lanes operation. The paper includes a speed analysis based on the Downs-Thomson Paradox theory, and a reliability analysis based on variance analysis of arrival time. According to the speed analysis, some road sections are now under phase 2 according to the Downs-Thomson Paradox, which is a state in which the bus speeds are greater than the car speeds. In the future it is predicted that cars and buses will reach an equilibrium speed which is in phase 3 of the multi-modal equilibrium theory. According to the reliability analysis of arrival time at each bus stop, in roads of median arterial bus lanes. the variance of arrival time is generally smaller than after the scheme implemented in eight months later.
A Study on Transit-Oriented Development Method to Activate Transit Use for High Urban-Density Muti-Nucleated Seoul
Lim, Hee-Ji ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 93~104
Transit-Oriented Development Model, which is recently proposed to activate transit use, is suitable for solving environmental erosion problems of sprawl cities with low urban density. Accordingly this model is inadequate to apply to Muti-Nucleated City with high urban density like Seoul. With this background. this study proposes ways to effectively implement changes from automobile-oriented Seoul to transit-oriented city through comparative analysis of the urban design policy of Station Impact Zone (SIZ) of Seoul and Transit-Oriented Development Policy of Singapore and Tokyo. First, the study suggests that the implementation strategies for Transit-Oriented Development in the job-oriented SIZ and the neighborhood-oriented SIZ should be made separately. In addition, the job-oriented SIZ should be designated as 'Strategic Centers' in Seoul Comprehensive Plan in order to make Transit-Oriented Centers. Lastly, the SIZ should be designated as 'the Empowerment Zones' in order to make the blighted areas around stations viable for redevelopment and new incentive system should be applied to activate setting up transit-transfer facilities.
Analysis on Video Image Detection System Performance by Vehicle Speed
Jang, Jin-Hwan ; Park, Chang-Soo ; Baik, Nam-Cheol ; Lee, Mee-Young ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 105~112
This paper not only tests VIDS(Video Image Detection System) performance by vehicle speed group but also suggests optimal VIDS height considering road and cost condition. The VIDS spreads over freeway and national highway and plays an important role in ITS(Intelligent Transportation Systems). As a result, speed data accuracy drops form 50kph vehicle speed and volume and occupancy data accuracy drop from 30kph. Lowest speed data accuracy is only 88%, but volume and occupancy accuracy are 75% and 77% respectively. The reason VIDS data accuracy drop by vehicle speed is gap distance decrease between vehicles. Therefore, this paper suggests
for optimal VIDS height considering road and cost condition.
A Geometric Design Method Based on the Running Speed Distribution
Jeong, Jun-Hwa ; Park, Chang-Ho ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 113~120
Highway geometric design aims to provide drivers with safe and efficient road conditions. Highway design method of Korea doesn't consider demand characteristics of drivers, vehicles etc. Therefore there is a gap between designer's expectation and user's behavior and it hinders to make safer roads. It is required to develop the geometric design criteria and design method based on driving characteristics to provide safe and flexible design. This study suggested a geometric design method of horizontal curves on rural 4-lane highways based on speed distribution.
Development of an Automatic Comprehensive Condition Diagnosis System for Inductive Loop Detector Using Magnetic Field
Kim, Nam-Sun ; Lee, Seung-Hwan ; Oh, Young-Tae ; Lee, Choul-Ki ; Kang, Jeung-Sik ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 123~134
This research aims at developing a new method which can replace the existing method. known as the quality factor(Q factor) method by an L-R-C test for use in the performance test of inductive loop detectors(ILD) being installed and maintained. In this study, a sensor to detect a magnetic field in terms of frequency and intensity, a method to collect field data, the method of analysis, and the method of diagnosis were developed. An automatic diagnosis system which was developed to overcome those drawbacks has the following features : First, field data is collected automatically by a test vehicle equipped with magnetic field sensors that is running can be said to along the roadway and. thus, the new system completely overcome the roadway and, thus, the new system can be said to completely overcome the inefficiency of the existing method second, since the magnetic fold generated from the ILD is the final output of the whole system of ILD, the existing problem has been solved. third. since each of the detection area by height is collected by the magnetic sensors installed by height. a basic for the identification of the vehicle types to be detectable and the setting of adjustment factors has been made. For the automatic diagnosis system developed during in this study, a reliability test was carried out by comparing vehicle times of ILD installed ideally.
A Link Travel Time Estimation Algorithm Based on Point and Interval Detection Data over the National Highway Section
Kim, Sung-Hyun ; Lim, Kang-Won ; Lee, Young-Ihn ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 135~146
Up to now studies on the fusion of travel time from various detectors have been conducted based on the variance raito of the intermittent data mainly collected by GPS or probe vehicles. The fusion model based on the variance ratio of intermittent data is not suitable for the license plate recognition AVIs which can deal with vast amount of data. This study was carried out to develop the fusion model based on travel time acquired from the license plate recognition AVIs and the point detectors. In order to fuse travel time acquired from the point detectors and the license plate recognition AVIs, the optimized fusion model and the proportional fusion model were developed in this study. As a result of verification, the optimized fusion model showed the superior estimation performance. The optimized fusion model is the dynamic fusion ratio estimation model on real time base, which calculates fusion weights based on real time historic data and applies them to the current time period. The results of this study are expected to be used effectively for National Highway Traffic Management System to provide traffic information in the future. However, there should be further studies on the Proper distance for the establishment of the AVIs and the license plate matching rate according to the lanes for AVIs to be established.
Progressive Iterative Forward and Backward (PIFAB) Search Method to Estimate Path-Travel Time on Freeways Using Toll Collection System Data
NamKoong, Seong ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 147~155
The purpose of this paper is to develop a method for estimation of reliable path-travel time using data obtained from the toll collection system on freeways. The toll collection system records departure and arrival time stamps as well as the identification numbers of arrival and destination tollgates for all the individual vehicles traveling between tollgates on freeways. Two major issues reduce accuracy when estimating path-travel time between an origin and destination tollgate using transaction data collected by the toll collection system. First, travel time calculated by subtracting departure time from arrival time does not explain path-travel time from origin tollgate to destination tollgate when a variety of available paths exist between tollgates. Second, travel time may include extra time spent in service and/or rest areas. Moreover. ramp driving time is included because tollgates are installed before on-ramps and after off-ramps. This paper describes an algorithm that searches for arrival time when departure time is given between tollgates by a Progressive Iterative Forward and Backward (PIFAB) search method. The algorithm eventually produces actual path-travel times that exclude any time spent in service and/or rest areas as well as ramp driving time based on a link-based procedure.
A Revenue Allocation Model for the Integrated Urban Rail System in the Seoul Metropolitan
Shin, Seong-Il ; Noh, Hyun-Soo ; Cho, Chong-Suk ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 157~167
Seoul metropolitan public transport reform results in the introduction of the semi-public operation and distance-based fare policies. With implementation of these policies, public transport revenue allocation has been (will be) evolved very complicated because the existing revenue allocation issues have not only been clearly solved, which is generated by the combined relationship among Korea Railroad Corporation (KRC). Seoul Metropolitan Subway Corporation (SMSC). Seoul Metropolitan Rapid Transit Corporation (SMRTC), and Incheon Rapid Transit Corporation (IRTC), but also the revenue allocation problem between bus and urban railroad-related organizations need to be considered in this combined framework. On top of that. based on the future plans such as the private sector's railroad construction plan(s), the light rail transit construction plans of several local governments and the join of remained bus lines of Seoul metropolitan areas, it is understood that the revenue allocation among public transport operating organization will become one of main issues of operation organization as well as local and central governments. As a basic approach for revenue allocation of public transport operation organizations, the purpose of this paper is to propose an integrated model applicable to estimate degree of service contribution in passenger carriage in the combined public transport network. With a hypothesis that the complete electronic card system is deployed, this paper supposes every passenger's loading and alighting stations is recordable. Thereby, this paper limits research scope as to Seoul metropolitan railroad area since used route(s) between origin and destination stations can not be traceded because transfer stations each passenger path through is not recorded. Each model proposed in the paper is as follows: 1. a generalized cost reflecting passenger's transfer behavior; 2.a K path model for determining similar routes between O-D; 3.an assignment model for loading O-D trips onto the detected similar routes using Logit Model.
Longitudinal Control of Acceleration Lanes and its Impact on Congestion Alleviation
Shin, Chi-Hyun ; Kim, Kyu-Ok ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 169~176
This paper introduces the dynamic control of acceleration lanes at freeway-ramp junctions. The feasibility of operation with flexible length of acceleration lane was tested with most possible traffic conditions. The operational qualify was also evaluated using average speed and total thru-put at both ramp section and freeway section. A CORSIM microscopic simulation model was used to evaluate the operation quality with a variety or volume conditions and three acceleration lanes, each representing different length categories. In addition, tollgate O-D data including travel times were obtained for two sections on the Gyeong-bu Freeway where an effective merging distance has been largely reduced. Its effect was analyzed and compared to the simulation results. Finally, the effects of acceleration lane are discussed and operational improvement at junctions is presented as research findings.
Video Image Detector Calibration Period Decision
Lee, Chung-Won ; Baik, Nam-Cheol ; Song, Young-Hwa ; Jang, Jin-Hwn ;
Journal of Korean Society of Transportation, volume 23, issue 5, 2005, Pages 177~185
The accuracy of a video image detector(VID) is gradually reduced due to the various environmental and mechanical factors. But there has been no systematic research about this VID accuracy decreasing. To maintain a proper level of VID accuracy for the advanced traffic management. a regular VID calibration process needs to be introduced. Because of its cost, however. the calibration cannot be performed frequently. Therefore, the method to decide the optimal calibration interval should be studied in details. This study presents two different calibration interval decision methods. Using the invented data collection equipment. some data in the field were collected and analyzed. which were used for the adaptability checking. Although the data were limited. the result is pretty promising. More data needs to be investigated later and this study will help to maintain the data quality of the ITS center.