Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Transportation
Journal Basic Information
Journal DOI :
Korean Society of Transportation
Editor in Chief :
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 Analysis of the Road Freight Transportation using the Simultaneous Demand-Supply Model
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 7~18
This study represents a first attempt in Korea to develop the simultaneous freight supply-demand model which considers the relationship between freight supply and demand. As the existing study was limited in one area, or the supply and the demand was separated and assumed not to affect each other, this study take it into consideration the fact that the demand affects supply and simultaneously vice versa. This approach allows us to diagnose a policy carried on and helps us to make a resonable alternative for the effectiveness of freight transportation system. To find a relationship between them, we use a method of econometrics. a structural equation theory and two stage least-squares(2SLS) estimation technique, to get rid of bias which involves two successive applications of OLS. Based on the domestic freight data, this study consider as explanatory variables a number of population(P), industry(IN), the amount of production of the mining and manufacturing industries(MMI), the rate of the effectiveness of freight capacity(LE) and the distance of an empty carriage operation(VC). This study describes well the simultaneous process of freight supply-demand system in that the increase of VC from the decrease of VC raises the cargo capacity and cargo capacity also augments VC. By the way. it is analyzed that the increment of VC due to the increase of the cargo capacity is larger than the reduction of VC owing to the increase of the quantify of goods. Therefore an alternative policy is needed in a short and long run point of view. That is to say, to promote the effectiveness of the freight transportation system, a short term supply control and a long run logistic infrastructure are urgent based on the restoration of market economy by successive deregulation. So we are able to conclude that gradual deregulation is more desirable to build effective freight market.
Estimation of the Value of Road Traffic Noise within Apartment Housing Prices
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 19~33
In the developed countries, traffic noise is one of most serious problems faced by people's lives. So the importance of the traffic noise is quite well recognized by the infrastructure planners as well as the people. The traffic noise is valued in monetary terms in some countries and it is reflected in estimating the net present value or benefit/cost ratio. On the contrary, the effects of traffic noise are not reflected in the assessment of infrastructure in most cases in Korea. However, as the income level has been increasing, more people have been becoming to put more importance on their living conditions. The purpose of this paper is to estimate the value of traffic noise in the Seoul metropolitan area. The housing price were surveyed to use the quasi-hedonic price technique. By this way, two housing prices at the same floor level in different 128 complexes in the Seoul metropolitan area were surveyed. the actual traffic noise level was also measured. The differences of housing prices and noise levels were analyzed using the various types of regression models. The value is quite different by size of house. The value of large house is higher than that of small house. Since the income level of people in large house is higher than that in small house. it might be said that value of traffic noise for high income people is higher than that for low income people. Moreover, the increase of 1dB(A) noise affects the house price by about 0.3% in Seoul metropolitan area.
Comparative Study on the Methodology of Motor Vehicle Emission Calculation by Using Real-Time Traffic Volume in the Kangnam-Gu
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 35~47
Traffic represents one of the largest sources of primary air pollutants in urban area. As a consequence. numerous abatement strategies are being pursued to decrease the ambient concentration of pollutants. A characteristic of most of the these strategies is a requirement for accurate data on both the quantity and spatial distribution of emissions to air in the form of an atmospheric emission inventory database. In the case of traffic pollution, such an inventory must be compiled using activity statistics and emission factors for vehicle types. The majority of inventories are compiled using passive data from either surveys or transportation models and by their very nature tend to be out-of-date by the time they are compiled. The study of current trends are towards integrating urban traffic control systems and assessments of the environmental effects of motor vehicles. In this study, a methodology of motor vehicle emission calculation by using real-time traffic data was studied. A methodology for estimating emissions of CO at a test area in Seoul. Traffic data, which are required on a street-by-street basis, is obtained from induction loops of traffic control system. It was calculated speed-related mass of CO emission from traffic tail pipe of data from traffic system, and parameters are considered, volume, composition, average velocity, link length. And, the result was compared with that of a method of emission calculation by VKT(Vehicle Kilometer Travelled) of vehicles of category.
The Estimation of VTTS using Traffic Regulation Obedience Choice Model
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 49~57
Since the value of travel time savings is found to be the most important benefit of transportation projects, considerable work has been done on the estimation of the value of travel time in many countries, including U. S. A. England, Australia, and Korea. And majority of them was mode choice model. This paper estimated the VTTS for commuters using traffic regulation obedience market model, which had not been applied in any previous studies, and survey data, which was obtained using Contingent Valuation Method. The result meets our expectations.
Performance Analysis for Electronic Toll Collection System, Hi-Pass
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 59~69
The purpose of this study is to analyze the performance of Electronic Toll Collection System (ETCS) which is one of the major prevailing intelligent transportation systems in the world. The system has been introduced by Korea Highway Corporation to address the traffic congestion on three major toll plazas in the Seoul Beltway: Pankyo, Chunggye and Sungnam. We analyzes the qualitative and quantitative aspects of the system in these test sites and compares their performance between before and after the trial operation period. In quantitative respect, we have observed that the ETCS in the three tollgates showed some savings in terms of tollgate passing time and waiting queues during the peak hour in the morning. Therefore, it can be said that ETCS is effective when the system is utilized with a certain usage level. In particular, users' responses to the system were very affirmative. That is, 84 percent of users has expressed satisfaction to the non-stop tolling service and 91 percent of non-users has expressed the intention to equip Hi-Pass OBU(On-Board-Unit) in their vehicles. Though it has not been yet seen the remarkable effects of the ETCS due to the insufficient supply of OBU's, the study has reached the conclusion after several simulation analysis that there will be considerable improvement in traffic flow in the three tollgates after additional distribution of the OBU's until December, 2000. It is also envisaged that ETCS has the potential to solve the major freeway congestion problem occurring in the toll plaza area and to provide convenience to the expressway users by non-stop toll transaction service.
The Technique of Estimating the Right-Turn Adjustment Factor
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 73~84
Korean Highway Capacity Manual applies 7 adjustment factors to estimate saturation flows at signalized intersections. Among the adjustment factors, the right-turn adjustment factor uses equation hard to understand and requires complicated computing process comparing other adjustment factors. Thus. this study was conducted in order to suggest a new technique of estimating the right-turn adjustment factor which is easy to understand and simple to computer by having reasonable degree of accuracy. In this study the right-turn saturation flow ratios which are important in estimating the factor are suggested and the equation to estimate the volume of right-turn on red signal(RTOR) is developed based on observed data. The right-turn saturation flow rates can be estimated according to turning radius and number of lanes of crossing road dividing right-turn lanes into canalized and uncanalized lanes. The RTOR volume is estimated using the proportion of the time during which RTOR is possible to the whole time of red signal according to the through traffic volume per lane of the approach at signalized intersections. The technique of estimating the right-turn adjustment factor suggested in this study, which follows the HCM2000 of U.S. in principal, first judges the right-turn lane to be used exclusively for right-turn or not by employing the RTOR factor and the judging equation developed in this study. Next, if the right-turn lane is not exclusive right-turn lane, the shared right-turn lane is classified into single lane approach or multi lane approach. Thus, a total of three methods of estimating the right-turn adjustment factor to the three cases are suggested in this study.
Minimum Travel Time Paths for ATIS in Urban Road Networks Using Genetic Algorithms
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 85~96
This paper discusses the problem of finding the Origin-Destination(O-D) shortest path in urban road networks that have variable special qualifies such as time windows for passing as well as geometrical special qualities such as U-turn and left-turn prohibition. The focus of this paper is motivated by the problem of finding minimum travel time paths for an advanced traveler information system (ATIS) in the context of intelligent transportation system(ITS) application. The transportation network with variable and geometrical special qualities is a more realistic representation of the urban road network in the real word. But, the traditional and existing shortest path algorithms can not search practical shortest path that variable special quality is reflected. This paper presents a shortest path algorithm which can search reasonable shortest path information for the urban ATIS application within a real time. The algorithm is based on genetic algorithm(GA). The high performance of the proposed algorithm is demonstrated by computer simulations.
A Dynamic assignment model for Dynamic Traffic Management in AM Peak
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 97~108
A dynamic transportation management should be applied specially in AM peak because AM peak is more critical than PM peak in traffic volume and demand. AM peak trip can be characterized by commuting and schooling. which have the high level of usage on public transportation, and constraint on arrival time. So transportation management applied in AM peak could deal with a mode choice and an arrival time constrain. Researchers were involved in the dynamic transportation assignment models for management of congested traffic network. But, there were no models which considered a mode choice and an arrival time constrain should be included in management of AM peak. So there are limits to use exist models to control and analyze AM peak traffic. In this study, it is proposed the combined dynamic transportation model, considering a mode choice and the start time selection with arrival time constrains, based on Ran and Boyce's model. The proposed model is verified the compatibility by applying to the newly designed time space expanded network. The result shows that proposed model consistent with dynamic user optimal travel pattern. From this we certificate the applicability of the proposed model to control and analyze AM peak traffic.
Development of a Queue Length Based Optical Length Set Methodology Using Image Detectors
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 109~121
In this dissertation, a new framework for controlling the traffic signal system based on queue length has been presented. More specifically, the scheme of determining the cycle time has been proposed. To derive more effective control strategy, four different traffic situation settings have been categorized. With the four categorization under consideration, the major outputs of the research is as follows : First, the queue length calculation algorithm using image detectors has been proposed. The algorithm produces the queue length using a pair of image detectors installed both on upstream and on downstream of a corridor. Second, the scheme of cycle time calculation, as a critical control variable, has been developed
A Study on the Visibility Distance of Road Traffic Signs
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 123~137
Many experts say that our roadsign system lacks some human factor considerations in its deployment. More specifically, the minimum required visibility distance as articulated in our manual is somewhat old and it leaves some to be amended. To delve into the problems more in detail, the GPS based experiment of measuring roadsign visibility distance has been conducted. The results show that the most significant factors affecting the visibility distance are speed of vehicle. number of information, and driving lane assignment, in that order of significance. The derived formula of determining the minimum required visibility are formulated using the multiple linear regression. That is, minimum required visibility distance(m)=161.68-21.11
number of information -1.22
speed of vehicle(km/h)+1.39
lane assignment. The derived formula can be utilized to some roadway sign system design and improvement plan. However, more detailed specifications about size of letter or legend and size of plate should be carefully investigated further to convey proper meaning of sign contents.
A Study on the Traffic Flow Characteristics and Its Applications of Urban Expressway
Journal of Korean Society of Transportation, volume 19, issue 4, 2001, Pages 147~148