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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
A study on Marketing Analysis and Role Sharing for Busan Port
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 17~30
Port of Busan hasn't established systematical port marketing strategy and hasn't split properly its role between the related parties such as Busan Metropolitan City, Busan Regional Maritime Affairs and Fisheries Office, Korea Container Terminal Authority and Busan Main Customs for its efficient implement. The study performs marketing analysis based on Questionnaire which is composed of 4P such as Product, Price, Place, Promotion and is respondent to shipping and forwarding companies to suggest the roles and relation between parties for Port of Busan. The conclusions are summarized as follows. First, the results of IPA ( Importance-Performance Analysis) show that Port of Busan needs to accomplish aggressive marketing activation in especially Promotion Mix of which importance scale is is the highest of the 4Ps next to Price Mix while its satisfaction scale is the lowest. Second, it is required that Busan Metropolitan City lays emphasis on Promotion Mix with BRMAF (Busan Regional Maritime Affairs and Fisheries Office) and BRMAF focuses on not only the Propriety of port tariff of Price Mix but also the enlargement of rail network of Place Mix KCTA(Korea Container Terminal Authority) preferentially has to change the system on port facility tariff of Price Mix and BMC(Busan Main Customs) need to focus on not only the effective management of empty container of Product Mix but also the flexibility of handling tariff of Price Mix.
Traffic Signal Control Methods for Functional Improvements in COSMOS
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 31~43
Traffic signal control methods are suggested to improve the operational effectiveness of COSMOS system in Seoul. First. a method that improves progression of the corridor traffic flow within a common sub-area was explored. Applying this method, both frequency and magnitude of offset transition were reduced as compared to the existing method. In addition, the level of connection among neighboring corridors increased by applying the method, thus the qualify of progression was also improved. Second, a practical guideline on signal phase design was proposed to improve the efficiency of actuated operations for the left-turn movement. Last, a method for estimating optimal queue length parameters was surveyed and evaluated. An evaluation study was performed for the suggested methods through both field and simulation studies. Results showed that the proposed methods gave better performance than the existing methods. It is expected that the use of proposed methods can improve operational performance of COSMOS.
The Estimation of the Regional Gross Capital Stock in Transport Sector of Korea
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 45~56
In this research we estimated regional gross fixed capital stock of transport sector, such as road railroad, airport and seaport during 1968-1997 in Korea. We also compared our estimation results with those of Korea and Japan. As basic analytic method, we used the regional allocation method. To estimate regional gross fixed capital stock of transport sector, we used the basic data on national wealth surveys in 1997, regional land price index and regional facilities index in transport sectors. We used the most reasonable data in the process of estimation after reviewing the collected data In order to get the reasonable capital stock by regions. we chose the allocation index which can minimize the difference between the estimated result and the real regional capital stock in the process to allocate the total gross capital into the regions. Compared our results with those of other researches in Korea, estimates in our research project could be said more accurate than those.
A study on the estimation of AADT by short-term traffic volume survey
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 59~68
AADT(Annual Average Daily Traffic) can be obtained by using short-term counted traffic data rather than using traffic data collected for 365 days. The process is a very important in estimating AADT using short-term traffic count data. Therefore, There have been many studies about estimating AADT. In this Paper, we tried to improve the process of the AADT estimation based on the former AADT estimation researches. Firstly, we found the factor showing differences among groups. To do so, we examined hourly variables(divided to total hours, weekday hours. Saturday hours, Sunday hours, weekday and Sunday hours, and weekday and Saturday hours) every time changing the number of groups. After all, we selected the hourly variables of Sunday and weekday as the factor showing differences among groups. Secondly, we classified 200 locations into 10 groups through cluster analysis using only monthly variables. The nile of deciding the number of groups is maximizing deviation among hourly variables of each group. Thirdly, we classified 200 locations which had been used in the second step into the 10 groups by applying statistical techniques such as Discriminant analysis and Neural network. This step is for testing the rate of distinguish between the right group including each location and a wrong one. In conclusion, the result of this study's method was closer to real AADT value than that of the former method. and this study significantly contributes to improve the method of AADT estimation.
An Impact of Lane Speed Differentials on Lane-Changing Behavior
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 69~80
In this paper, the model was developed that shows the impact of lane speed differentials on lane-changing behavior at the condition of discretionary 1ane-changing. Generally, the step of discretionary lane-changing is composed of two parts. First Part, after observing traffic condition drivers judge their future action. Second part, drivers put their judgements into action. In this paper we studied the impact of lane speed differentials on both drivers' decision making and lane-changing maneuver at the case of the gap on the object lane acceptable. For analysing this effect, other factors, except speed differentials, that could influence on drivers' decision-making were excluded. To reflect the effects of differentials between desire-speed and traveling speed, the speed on the current lane was also considered as the additional variable. The SAS package was used to estimate parameters and data was analysed with two parts with respect to the speed differentials. The results show that in the range of 0∼2.0m/s differentials the probability to change the lane was increased as the speed differentials increased. However in the other speed range, it was decreased as the speed differentials increased and this shows that there are factors leading lane-changing as well as resisting the maneuver. In short, drivers are unlikely to change current lane over the speed differentials of 2.0m/s. With this the geometry of the road could be designed to increase the stability of the traffic flow
Development of An Automatic Incident Detection Model Using Wilcoxon Rank Sum Test
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 81~98
The purpose of this study is to develop an automatic incident detection model using Wilcoxon Rank Sum Test. The data used in this study are occupancy data collected from inductive loop vehicle detection systems (VDS) on expressways in Korea. The approach taken in this study to detect an incident is different from the existing ones as follows : In the model developed in this study, an incident is identified by applying Wilcoxon Rank Sum Test continuously to the field data while in the existing models an incident is identified by comparing the field data with predetermined threshold values. The input data used for the detection of an incident in the model are occupancy data collected from upstream and downstream vehicle detection systems of the accident location. The test result shows that the proposed model correctly detects an incident in relatively short period of time(two to three minutes) without considering locational and time pattern factors. In addition, detection and false alarm test was conducted to compare the performance of the proposed models with existing models known as APID, DES, DELOS. In the text the proposed model should be better results than existing ones in terms of detection rate and false alarm rate. It should be noted, however, that further research efforts are needed to improve its capability ill identifying the difference between an accident and special events such as a compression wave
Development of multiclass traffic assignment algorithm (Focused on multi-vehicle)
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 99~113
The multi-class traffic assignment problem is the most typical one of the multi-solution traffic assignment problems and, recently formulation of the models and the solution algorithm have been received a great deal of attention. The useful solution algorithm, however, has not been proposed while formulation of the multi-class traffic assignment could be performed by adopting the variational inequality problem or the fixed point problem. In this research, we developed a hybrid solution algorithm which combines GA algorithm, diagonal algorithm and clustering algorithm for the multi-class traffic assignment formulated as a variational inequality Problem. GA algorithm and clustering algorithm are introduced for the wide area and small cost. We also performed an experiment with toy network(2 link) and tested the characteristics of the suggested algorithm.
Development of a Gap Acceptance Model for the Simulation of Merging Area on Urban Freeways
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 115~128
Traffic engineers have developed and implemented various microscopic simulation models to verify the traffic performance and to prevent the expected problems. The existing microscopic simulation models categorize drivers into several types to reflect various drivers' driving patterns but miss the dynamics of drivers' behavior changed based upon the traffic conditions. It was found from the field data collected from two different merging sections on an urban freeway in Seoul, Korea, that the drivers' critical gap distributions are changed based on (1) the traffic density on the adjacent lane to the acceleration lane and (2) the opportunities left to merge in terms of distance to the end of acceleration lane. It was also found from the study that the drivers' critical gap distributions follow the Normal distribution. and its mean and variance change while a vehicle progresses on an acceleration lane. This paper proposes a new gap-acceptance model developed based on a set of drivers' critical gap distributions from each segment on the acceleration lanes. Through the comparison study between the field data and the results from the simulation utilizing the proposed model, it was verified that (1) the distribution of merging points on an acceleration lane to the adjacent main lane at different density levels, (2) the size of the gap accepted for merging and (3) the speed difference between the merging vehicle and the trailing vehicle at the time of merging are statistically identical to the field data at 95% confidence level.
Dynamic Structural Equation Models of Activity Participation and Travel Behavior using Puget Sound Transportation Panel
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 129~140
This paper develops a dynamic structural equation model, which captures relationships among socio-demographics, activity participation(i.e., time use) and travel behavior in consideration with time variation effects. The data used in developing the model are two waves(the year 1991 and 1992) from Puget Sound Transportation Panel (PSTP). which is surveyed in Puget Sound Region in United States. The PSTP is widely used in transportation behavior analysis and includes various information of traveler's socio-economic, travel patterns, and activity participation. In the model, we use 10 endogenous variables including activity participations and travel behaviors and 10 exogenous variables composed of time variant and invariant traveler's socio-demographic variables. The empirical model shows that strong relationships exist not only between socio-demographics and travel behavior, but between waves. We also confirm needs of panel data set to identify and understand time variation effects and travel behaviors.
A Basic Study on Users Demand Forecasting of Community Bus Reflecting Travel Effort of Elderly People
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 149~150
DEVS-based Modeling and Simulation for Intelligent Transportation Systems
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 151~152
A Study on the Methods of Road Investment Evaluation for the Safety
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 153~154
The Effect of Public Transit Investment on Automobile Ownership and Use in Households
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 155~156
Hub-and-spokes service design of rail freight network for multi-modal transportation : An application to European network
Journal of Korean Society of Transportation, volume 20, issue 6, 2002, Pages 157~158