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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
A Study on Takeoff Decision Speed Improvement of Air Transport Airplane
Noh, Kun-Doo ; Choi, Youn-Chul ; Yoo, Kwang-Eui ;
Journal of Korean Society of Transportation, volume 23, issue 4, 2005, Pages 7~16
Rejected Takeoff Accidents are not common. but if occurred, it leads to big disaster From the year of 1959, when Jet Transport service opened, to the year of 2000, Rejected Takeoff accidents/incidents occurred total of 94 cases. All cases led to overrun, and major cause is to initiate stopping maneuvers over
, takeoff decision speed, according to National Transport Safety Board of America. Similar results are represented in Aviation Safety Reporting System of National Aeronautics and Space Administration. So I believe that it is worth studying if Airplane Flight Manual, which is the reference Performance criteria, is appropriate to operations of line pilots. The definition of
has been revised a couple of times and Rejected Takeoff Certification Standards for Transport Airplanes was changed in 1998. It shows that up to now there are some portions unreasonable. This study focused on gathering the pilot's tendency for current Rejected Takeoff Procedures of K airlines and analyze the factors they concern. I chose B777 airplane and actually measured the recognition and reaction time of the rejected takeoff transitions through Simulators. And compared the results with the data of flight test and Airplane Flight Manual.
Development of Train Velocity and Location Tracking Algorithm for a Constant Warning Time System
Oh, Ju-Taek ; Kim, Tae-Kwon ; Park, Dong-Joo ; Shin, Seong-Hoon ;
Journal of Korean Society of Transportation, volume 23, issue 4, 2005, Pages 17~28
About 91.1% of Railway-Highway Crossings (RHC) in Korea use a Constant Distance Warning System(CDWS), while about 8.9% use a Constant Warning Time System(CWTS). The CDWS does not recognize speed differences of approaching trains and provides only waiting times to vehicles and pedestrians based on the highest speed of approaching trains. Under the CDWS, therefore, low speed trains provide unnecessary waiting times at crossings which often generates complains to vehicle drivers and pedestrians and may cause wrong decisions to pass the crossings. The objective of this research is to improve the safety of the RHC by developing accurate a CWTS. In this research a train speed and location detection system was developed with ultra sonic detectors. Locations of the detectors was decided based on the highest speed and the minimum warning time of Saemaul of 160 km/h. To validate the algorithms of the newly developed systems the lab tests were conducted. The results show that the train detection system provides accurate locations of trains and the maximum error between real speeds of trains and those of the system was 0.07m/s.
The Calculation of the Traffic Safety Evaluation Index of Cities
Sung, Nak-Moon ; Chang, Il-Joon ; Chang, Myung-Soon ; Kim, Won-Chul ;
Journal of Korean Society of Transportation, volume 23, issue 4, 2005, Pages 31~36
Traffic safety evaluation of a city or area on the basis of the accident rate has a limitation that its result is dependent on the characteristics of population. In this paper. we developed a methodology of taking simultaneously the population into account in evaluating the safety, and calculated the traffic safety evaluation index of 25 local governments in the metropolitan area. Based on the result of calculation of the traffic safety evaluation index, it is identified that the proposed approach is able to be an alternative to cooperatively consider various population. The correlation coefficients between the traffic safety evaluation index I(X) which is cooperatively consider the population size and road length, and population based F(P) and road length based F(L) are 0.68 and 0.92 respectively. This means that the proposed approach can overcome the limitation which safety evaluation index are differently calculated according to the characteristics of population. The methodology and traffic safety evaluation index proposed in this paper can be utilized in executing the traffic safety policies for local governments and areas.
Alternating Offers Bargaining Game and Wardrop's User Equilibrium
Lim, Yong-Taek ;
Journal of Korean Society of Transportation, volume 23, issue 4, 2005, Pages 37~45
This paper presents a relationship between Nash bargaining game and Wardrop user equilibrium, which has been widely used in transportation modeling for route choice problem. Wardrop user equilibrium assumes that drivers in road network have perfect information on the traffic conditions and they choose their optimal paths without cooperation each other. In this regards, if the bargaining game process is introduced in route choice modeling, we may avoid the strong assumptions to some extent. For such purpose, this paper derives a theorem that Nash bargaining solution is equivalent to Wardrop user equilibrium as the barging process continues and prove it with some numerical examples. The model is formulated based on two-person bargaining game. and n-person game is remained for next work.
The Study on the Accident Injury Severity Using Ordered Probit Model
Ha, Oh-Keun ; Oh, Ju-Taek ; Won, Jai-Mu ; Sung, Nak-Moon ;
Journal of Korean Society of Transportation, volume 23, issue 4, 2005, Pages 47~55
In recent years, the rapid growth of vehicles have increased traffic crashes. Since they can cause the economic losses and have put the life qualify in danger, there should be numerous efforts to reduce traffic crashes. To reduce traffic crashes, this research seeks to improve the safety of intersections by analysing causations of injury severity with Ordered Probability Model. This research applied the Ordered Probit Model, which assumes that
(random error) is normally distributed, for model calibration and used
(likelihood ratio) and
(Chi-square) for model selection. The results show that minor road traffic, heavy vehicle rates, major and minor right-turn rates, presence of lightings, speed limits, instructive line for left-turn traffic are significant factors affecting crash severities at signalized intersections.
The Development of Estimation Technique of Freeway Origin-Destination Demand Using a Real Traffic Data of FTMS
Kim, Ju-Young ; Lee, Seung-Jae ;
Journal of Korean Society of Transportation, volume 23, issue 4, 2005, Pages 57~69
The goal of this paper is to develop freeway Origin-Destination (OD) demand estimation model using real-time traffic data collected from Freeway Traffic Management System (FTMS). In existing research, the micro-simulation models had been used to get a link distribution proportion by time process. Because of hi-level problem between the traffic flow model and the optimal OD solution algorithm, it is difficult for the existing models to be loaded at FTMS. The formulation of methodology proposed in this paper includes traffic flow technique to be able to remove the bi-level problem and optimal solution algorithm using a genetic algorithm. The proposed methodology is evaluated by using the real-time data of SOHAEAN freeway, South Korea.
Multi-step Ahead Link Travel Time Prediction using Data Fusion
Lee, Young-Ihn ; Kim, Sung-Hyun ; Yoon, Ji-Hyeon ;
Journal of Korean Society of Transportation, volume 23, issue 4, 2005, Pages 71~79
Existing arterial link travel time estimation methods relying on either aggregate point-based or individual section-based traffic data have their inherent limitations. This paper demonstrates the utility of data fusion for improving arterial link travel time estimation. If the data describe traffic conditions, an operator wants to know whether the situations are going better or worse. In addition, some traffic information providing strategies require predictions of what would be the values of traffic variables during the next time period. In such situations, it is necessary to use a prediction algorithm in order to extract the average trends in traffic data or make short-term predictions of the control variables. In this research. a multi-step ahead prediction algorithm using Data fusion was developed to predict a link travel time. The algorithm performance were tested in terms of performance measures such as MAE (Mean Absolute Error), MARE(mean absolute relative error), RMSE (Root Mean Square Error), EC(equality coefficient). The performance of the proposed algorithm was superior to the current one-step ahead prediction algorithm.
Application of Ant System Algorithm on Parcels Delivery Service in Korea
Jo, Wan-Kyung ; Rhee, Jong-Ho ;
Journal of Korean Society of Transportation, volume 23, issue 4, 2005, Pages 81~91
The Traveling Salesman Problem(TSP) is one of the NP-complete (None-deterministic Polynomial time complete) route optimization problems. Its calculation time increases very rapidly as the number of nodes does. Therefore, the near optimum solution has been searched by heuristic algorithms rather than the real optimum has. This paper reviews the Ant System Algorithm(ANS), an heuristic algorithm of TSP and its applicability in the parcel delivery service in Korea. ASA, which is an heuristic algorithm of NP-complete has been studied by M. Dorigo in the early 1990. ASA finds the optimum route by the probabilistic method based on the cumulated pheromone on the links by ants. ASA has been known as one of the efficient heuristic algorithms in terms of its calculation time and result. Its applications have been expanded to vehicle routing problems, network management and highway alignment planning. The precise criteria for vehicle routing has not been set up in the parcel delivery service of Korea. Vehicle routing has been determined by the vehicle deriver himself or herself. In this paper the applicability of ASA to the parcel delivery service has been reviewed. When the driver s vehicle routing is assumed to follow the Nearest Neighbor Algorithm (NNA) with 20 nodes (pick-up and drop-off places) in
service area, his or her decision was compared with ASA's one. Also, ASA showed better results than NNA as the number of nodes increases from 10 to 200. If ASA is applied, the transport cost savings could be expected in the parcel delivery service in Korea.