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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 20, Issue 7 - Dec 2002
Volume 20, Issue 6 - Dec 2002
Volume 20, Issue 5 - Oct 2002
Volume 20, Issue 4 - Aug 2002
Volume 20, Issue 3 - Jun 2002
Volume 20, Issue 2 - Apr 2002
Volume 20, Issue 1 - Feb 2002
Selecting the target year
Strategies to Attract Transshipment Container Cargos from/to China by Korea Ports
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 7~16
Rapid growth rate of container traffic in China has caused the fierce competition to attract Trans-shipment Container Cargos from/to China among competitive ports in Asia. Therefore, this paper aims to suggest some strategies to attract them from/to China by Korea ports. To do so, it evaluates the preference of important ports in the competitive situation and the competitiveness of important ports in Asia, and finally proposes the relative order of important factors. Based on the evaluation of it, Both the Pusan and the Kwangyang ports have to strengthen port facility to attract move traffic and in detail, reinforce the number of berth, yard areas and handling equipment. they also have to provide high qualify of services to deliver cargos in time. not being damaged and swiftly response to shipowner and shipper's claim.
A Study on Evaluating Length Limit in Tangent Section of Highway Based on Driver's Workload
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 17~26
Driver's psychophysiological load is one of the key measures for evaluating the safety of the highway. The purpose of this study is to propose and to test the methodology of evaluating the length limit of tangent section using driver's psychophysiological load. Driver's psychophysiological data is represented by the data acquire by frontal and occipital lobe. In order to compare the differences between tangent segments and the orders, real road driving experiments were performed. We collected psychophysiological data during the operation of vehicles. The experimental data were analyzed using FFT (Fast Fourier Transform) and relative power spectrum tools. These routine produces the beta value which is a major factor in consideration of driver's condition. The results in this study are summarized as follows: (1) A new methodology of evaluating the length limit in tangent section of highway using driver's psychophysiological load was proposed. (2) It was observed that driver's work load at tangent section was three times lower than that at the other section types. The beta value at tangent section is 2.219, while that at general section is 0.821. (3) It was observed that the driver's work load was significantly dropped to 0.428 after the continuous driving of 4.2km tangent section. (4) Based on the experimental subjects(from 27 Years to 31). we suggest that 30 times of design speed(3.0 km) could be acceptable as the length limit of tangent section in highway rather than the Previous limit which is 20 times of design speed(2.0km).
An Estimation of Congestion Cost on the Seoul-Pusan Express Highway
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 27~38
This study estimates the social cost of the traffic congestion of the Express highway from Seoul to Pusan during the New Year holiday in 1999. Considering inelastic demand and the hyper congestion, we show the congestion cost can be estimated as externalities caused by traffics which exceed the road capacity. Due to the congestion, it is estimated that it took about 12.40 hours more from Seoul to Pusan. The congestion is also estimated to have caused fuel cost of 0.6 billion won. time cost of 43.6 billion won and environmental cost of 0.5 billion won. The total cost reached up to 44.8 billion won.
A study on partner's Relationships for Air Traffic Management Effectiveness
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 39~46
There are many studies which reveal most of the accidents are related to pilot errors. Looking at each phase of flight, the accidents which occurred at the segments of take-off and landing consist of 70%, cause these phases need precise cooperations between pilots and ATC specialists to make sure every instructions understood and instruments to be normal. Therefore, the accidents of these phases leave great regrets and the price was enormous to people and equipments. Until now, most of the studies investigate the accident itself and very few show the relationships between pilots and air traffic controllers. This study analyzes the inter-dependence, mutual trust, dependability and satisfaction between them who play an important parts in flight. Based upon the findings, the impacts of relationships between them to aviation safety could be explained. As for the results, the inter-dependence, mutual trust, dependability and satisfaction are relatively high but the standpoint is little bit different for each of them. These findings suggest that the improvements of relationships between them need more effort than that of the present to ensure the aviation safety and efficient flights.
A Study on the Speed Variation Characteristics According to Tunnel Intervals in the Continuous Tunnel Conditions
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 47~58
This thesis is based on the speed variations which are observed both in a sing1e tunnel and a continuous tunnel. Kumdae II tunnel and Chiak I tunnel of Jungang Expressway are selected in order to analyze the characteristics of speed variations according to tunnel intervals I place importance on the computation of tunnel intervals according to the speed variations. there's a summary of the results. The results of the study reveal that speed changes occur both on 1km ahead of tunnel and within the tunnel. The speed change amounts to 7.1km/hr(6.7%) on these survey Points 2.7km/hr (2.9%) on access points, and from -3.6km/hr (-3.8%) to, +4.1km/hr(+4.7%) irregularly on egress points. The magnitude of speed chance appears small on the survey points where an interval of tunnel is short whereas the speed chance turn out to be rather significant on the points where the tunnel interval is long. The analysis of tunnel distances using multiple regression models shows that the appropriate tunnel distance turns out to be 732m. The distance of 732m seem to be providing a fecundation for uniform traffic flow in continuous tunnel conditions.
Analyzing Efficiency in the Seoul's Urban Bus Industry Using Data Envelopment Analysis
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 59~68
Using 1996 annual observations for 69 bus firms in Seoul, this paper measures firm-level efficiency with data envelopment analysis(DEA) and identifies firm characteristics indicative of differential efficiency in these firms with Tobit regression analysis. The paper then conceptualizes that these firms produce two kinds of output(city/seat bus kilometers or city/seat bus Passengers) using four inputs (labor vehicle, fuel and maintenance). The findings show that, on an average, these firms have only a little input saving potential of 0.9 percent, while not a little output increasing potential of 12.9 percent. On the other hand, it is discovered that these firms operate more efficiently with a lower ratio of maintenance employees to total employees. Furthermore, it appears that both the ratio of seat buses to total buses and average speeds positively affect efficiency in this industry.
Using Evolution Program to Develop Effective Search Method for Alternative Routes
CHOI, Gyoo Seok ; SEO, Ki Sung ; PARK, Jong Jin ;
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 71~79
This paper presents an effective alternative K-paths calculation method based on a Evolution Program (EP). We developed efficient genetic operators for path calculation. A major problem of the existing approach(similarities among the paths) can be resolved using EP's. The performance of the suggested method is evaluated and compared with the k-th shortest path for the virtual road network model by computer simulation. The results of computational experiments of the suggested method are found to be satisfactory in terms of the dispersion of alternatives.
Computer Simulation of Pedestrian Collision Trajectory for Various Velocities
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 81~92
An automobile crash with a pedestrian generates a trajectory which is crucial to identify the cause of the crash. Previous researches have been carried out for pedestrian movement using simple explicit formulae. The formulae are derived from elementary physics. Therefore, they could not sufficiently include variables of a vehicle and a pedestrian. To overcome such a limitation, a simulation is utilized for the pedestrian behavior in crash environment. A dynamic software called MADYMO is utilized for the simulation. A simulation model is established. The automobile body and a dummy are modeled with rigid bodies, joints and springs. The simulation results are compared with those from explicit formulae. It is found that the explicit formulae did not fit to pedestrian conditions. Simulations are performed for various velocities of automobiles. Results are discussed for the usage of the simulation.
Developing Higher-Order Continuum Models for Describing Traffic Flow Behavior at Lane Drops Using Momentum Equation
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 93~104
The purpose of this study was to develop a improved high-order continuum model among macroscopic traffic flow models. This study was mainly performed for uninterrupted flow. In the first step, the proposed model described traffic flow at dropped lane. (no exits) It was possible to describe the traffic flow during short-term considering lane change. The proposed model was based on Payne's model. Our model was newly applied to uninterrupted traffic flow in consideration of geometry condition and driver behavior. It is possible to establish efficient control strategies, simulation and assess the effects of geometric improvements using this model. This model was simulated with field data for the actual adaption. The results of the model tests, traffic volume and density is suitably represented. we think that the results in the article can be led to predicting the situation in the near future.
Development and Evaluation of Traffic Conflict Criteria at an intersection
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 105~115
For many rears, traffic accident statistics are the most direct measure of safety for a signalized intersection. However it takes more than 2 or 3 yearn to collect certain accident data for adequate sample sizes. And the accident data itself is unreliable because of the difference between accident data recorded and accident that is actually occurred. Therefore, it is rather difficult to evaluate safety for a intersection by using accident data. For these reasons, traffic conflict technique(TCT) was developed as a buick and accurate counter-measure of safety for a intersection. However, the collected conflict data is not always reliable because there is absence of clear criteria for conflict. This study developed objective and accurate conflict criteria, which is shown below based on traffic engineering theory. Frist, the rear-end conflict is regarded, when the following vehicle takes evasive maneuver against the first vehicle within a certain distance, according to car-following theory. Second, lane-change conflict is regarded when the following vehicle takes evasive maneuver against first vehicle which is changing its lane within the minimum stopping distance of the following vehicle. Third, cross and opposing-left turn conflicts are regarded when the vehicle which receives green sign takes evasive maneuver against the vehicle which lost its right-of-way crossing a intersection. As a result of correlation analysis between conflict and accident, it is verified that the suggested conflict criteria in this study ave applicable. And it is proven that estimating safety evaluation for a intersection with conflict data is possible, according to the regression analysis preformed between accident and conflict, EPDO accident and conflict. Adopting the conflict criteria suggested in this study would be both quick and accurate method for diagnosing safety and operational deficiencies and for evaluation improvements at intersections. Further research is required to refine the suggested conflict criteria to extend its application. In addition, it is necessary to develope other types of conflict criteria, not included in this study, in later study.
A Study on the Performance Comparison of S2 type Bridge Rails
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 117~124
In the consideration of road circumstances, various designs and functions of roadside safety barriers can make us to select proper features easily. Our new steel bridge rails are energy absorbing, easy to be handled and command a fine view. In this paper, the comparisons of new steel bridge rails and safety shaped concrete bridge rails are accomplished according to national vehicle crash test criteria. Test level S2 was applied to compare the two kinds of bridge rails and the results are as follows. Through the car clash test to evaluate occupant risks of safety barriers, concrete bridge rails recorded higher occupant ride down accelerations than steel bridge rails by 2gs or so. Both types are evaluated to be included within safe regions though concrete type exceeded maximum values, 20gs. In heavy vehicle crash test to make sure the structural adequacy of safety features, both types of bridge rails showed stabilized behaviors. Test vehicles showed stable trajectories and lateral deformations of both bridge rails were determined to be acceptable. Newly developed steel bridge rails have com-pleted a regular course of structure analysis, simulations and full-scale vehicle crash tests. And evaluated as structurally adequate and safe barriers. But some problems related to exit speeds and angles remained to be solved.
Analysis of Trip Length Distribution between Commodity-Based Model and Truck Trip-Based Model in Seoul Metropolitan Area
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 125~134
There are two urban freight demand-forecasting models such as commodity-based model and truck trip-based model. Commodity-based model is based on the freight system related to the freight trans-portation basically. So this model does not deal truck trips but freight movements for the main analysis. However, truck trip-based model deals inflow and outflow of truck trip from/to each zone using aggregated independent variable. The major purpose of this study is to estimate relationship between commodity trip and truck trip when estimating origin and destination in truck trip-based model as well as to estimate trip length distribution(TLD) model, which can describe relationship well. Through this study, it will be expected to suggest theoretical background, frame-work and model that can not only overcome the limits of truck trip-based model but also consider commodity tonnage using TLD. For the analysis, commodity tonnage data of Seoul metropolitan area, which surveyed by the Korea Transport Institute(1998), was used. And according to the trip length distribution, rate of commodity and truck trip was presented. The purpose of this study is estimating ton-trip length distribution of commodity-based model through truck-trip length distribution of truck trip-based model. And theoretical framework for one relative model is suggested from each trip length distribution using Gamma distribution. Both truck trip length distribution and commodity trip length distribution have statistical significant by goodness of fit test. And also, re-estimated TLD through total commodity TLD and intermediation function has a statistical significant too. For applying to each goods, miscellaneous industry goods and chemical industry goods are suitable for TLD model through intermediation function in this study. However, metallic industry goods and light industry goods are not suitable. Something stands out for the future study. Some factors such as category of business, unifying force of industry, industry structure of zone are important in the stage of urban commodity distribution. How-ever, we couldn't consider them. Therefore, further study may be considered some parameters and variables that able to reflected to the model in the next study.
Development of the Optimal Signal Control Algorithm Based Queue Length
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 135~148
In this paper, a 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. In addition, 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 and green split using the queue lengths has been proposed. To validate the results, a simulation study was conducted with a network environment. Results showed that the proposed method gave better operational performance than a traditional method. However, additional validation effort is necessary in order to apply the real traffic conditions.
Evaluation of Three-Phase Actuated Operation at Diamond Interchanges
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 149~159
The performance of two single-barrier three-phase control systems at diamond interchanges was evaluated for various traffic conditions. To emulate the actuated signal control, hardware-in-the-loop system combined with CORSIM simulation program was used. Two performance measures, average delay and total stops, were used for the evaluation process. Results showed that the two three-phase systems gave similar performance in terms of average delay, but not stops. The delay performance of each phasing system was generally dependent on the traffic pattern and ramp spacing. However, there was a distinct movement preference for each phasing system. The total stops decreased as the spacing increased, and it was the most sensitive variable that can differentiate between the two three-phase systems. It was also shown that the hardware-in-the-loop control could be a good method to overcome the limitations of current simulation technology.
The Comparative Analysis of National ITS Standardization System
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 171~181
Modeling Intersections and Other Structures in Highway Alignment Optimization
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 185~185
A Basic Study on Establishing and Operating Intersectional Area
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 186~187
Analytical Dynamic Traffic Assignment Approaches for Modelling Integrated Real-Time Traffic Control Systems
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 188~188
A Study on the Legal System Establishments and Its Improvement for Traffic Facilities of Busan Metropolitan city
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 189~190
Development and Application of a Dynamic Offtracking Model with Superelevation on Horizontal Curve Sections
Journal of Korean Society of Transportation, volume 20, issue 2, 2002, Pages 191~191