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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 28, Issue 6 - Dec 2010
Volume 28, Issue 5 - Oct 2010
Volume 28, Issue 4 - Aug 2010
Volume 28, Issue 3 - Jun 2010
Volume 28, Issue 2 - Apr 2010
Volume 28, Issue 1 - Feb 2010
Selecting the target year
Development of an Incident Detection Algorithm by Using Traffic Flow Pattern
Heo, Min-Guk ; No, Chang-Gyun ; Kim, Won-Gil ; Son, Bong-Su ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 7~15
Research of this paper focused on developing and demonstrating of algorithm with the figures of difference between historical traffic pattern data and real-time traffic data to decide on what the incident is. The aim of this dissertation is to develop incident detection algorithm which can be understood and modified easier to operate. To establish traffic pattern of this algorithm, weighted moving average method was applied. The basis of this method was traffic volume and speed of the same day and time at the same location based on 30-second raw data. The model was completed by a serious of steps of process-screening process of error data, decision of the traffic condition, comparison with pattern data, decision of incident circumstances, continuity test. A variety of parameter value was applied to select reasonable parameter. Results of application of the algorithm came out with figures of average detection rate 94.7 percent, 0.8 percent rate of misinformation and the average detection time 1.6 minutes. With these following results, the detection rate turned out to be superior compared with result of existing model. Applying the concept of traffic patterns was useful to gain excellent results of this study. Also, this study is significant in terms of making algorithm which theorized the decision process of actual operators.
A Comparative Study on Assessment of Speed Enforcement by Unmanned Camera and Policeman
Gang, Su-Cheol ; Kim, Man-Bae ; Gang, Dong-Geun ; Jang, Sun-Hui ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 17~24
As various social problems occur due to increasing traffic accidents, the government has setup and executed strong safety policies. As a result, the number of traffic accidents and the death toll have been decreasing in recent years. However, the setup and execution of the various policies for reducing traffic accidents cost much, so it is necessary to evaluate the cost-effectiveness of each policy. In the present study, enforcement by means of an unmanned over-speed enforcement system, the enforcement effect of which was proven good compared to the cost required for traffic enforcement, is compared with enforcement by policemen. As a result of the comparison, the average speed was 82.66 km/h before the use of unmanned systems and policemen; the average speed with manned enforcement was 70.57 km/h; and the average speed with unmanned systems was 67.85 km/h. The speed limit violation rate was 65% before the use of unmanned systems and policemen; 32% with manned enforcement; and 15% with unmanned systems. Considering the kinds of vehicles, the average speed and violation rate were highest among private cars, then vans, and then trucks.. Considering lanes. The accident rate was estimated based on the above results, and the input cost-to-advantage was estimated. The annual cost-to-advantage was estimated by comparing the above estimated values with the conditions before the unmanned over-speed enforcement system. Subsequently, the enforcement by policemen showed a negative advantage of 76,130,590 won, and the enforcement by the unmanned system showed a positive advantage of 38,577,670 won.
A Study on Effectiveness of Entry/Exit Flare at Roundabout
Kim, Tae-Yeong ; Kim, Gyeong-Hwan ; Park, Byeong-Ho ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 25~32
This study deals with the roundabout by flare of entry and exit. The goal is to analyze the relative effectiveness of roundabout by flare of entry and exit. In pursuing the above, this study gives the particular attentions to comparing the performances using VISSIM software. The main results analyzed are as follows. First, the single and double roundabouts are analyzed to have LOS F in the case of total entering vehicles of 2,400pcph and 4,400pcph Second, the roundabouts by entry flare analyzed to have LOS F in the case of total entering vehicles of 2,800~3,200pcph and the roundabouts by entry and exit flare analyzed to have LOS F in the case of total entering vehicles of 3,200~3,600pcph. Finally, result of comparative analysis of roundabout and roundabout by flare of entry and exit, capacity of roundabout by flare of entry and exit are located between 1-lane roundabout and 2-lane roundabout. therefore it analyzed that roundabout by flare of entry and exit can be added to new type roundabout.
A Study on the Greenhouse Gas emission from Ships in Korea
Choe, Sang-Jin ; Park, Seong-Gyu ; Jang, Yeong-Gi ; Lee, Hui-Gwan ; Hwang, Ui-Hyeon ; Bong, Chun-Geun ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 33~42
Recently, the reduction of greenhouse gases(GHG) for climate change is the most important international issue. In order to control efficiency GHG emission rate reduction, it is essential to establish GHG emission inventory preferentially. The emission of ships that are emitting its
in international waters is becoming chief among the issues which country is put under an obligation. In the IMO reports, shipping is estimate to emit 1,046million tonnes of
, which corresponds to 3.3% of global emission during 2007. International shipping is estimated to have emitted 870 million tonnes, about 2.7% of global emission of
in 2007. In this study, the general information of GHG emission, based on fuel consumption statistic, Tier 1, and the emission inventory is calculated to break down in to domestic and international emission. The GHG emission from ships in Korea was total 31,646 Gg
-eq in 2009, which is included fishing, Korea flag coastal ship, Korea flag ocean going ship and foreign flag ships. And domestic emission and international emission was 5,398Gg
-eq and foreign flag ship was 18,618Gg
An Analysis of Choice Behavior for Tour Type of Commercial Vehicle using Decision Tree
Kim, Han-Su ; Park, Dong-Ju ; Kim, Chan-Seong ; Choe, Chang-Ho ; Kim, Gyeong-Su ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 43~54
In recent years there have been studies on tour based approaches for freight travel demand modelling. The purpose of this paper is to analyze tour type choice behavior of commercial vehicles which are divided into round trips and chained tours. The methods of the study are based on the decision tree and the logit model. The results indicates that the explanation variables for classifying tour types of commercial vehicles are loading factor, average goods quantity, and total goods quantity. The results of the decision tree method are similar to those of logit model. In addition, the explanation variables for tour type classification of small trucks are not different from those for medium trucks', implying that the most important factor on the vehicle tour planning is how to load goods such as shipment size and total quantity.
A Study on Pedestrian's Psychological Estimation by Control of Main Design Factors in the Public Open Space (Focused on the Public Open Space of Centum and Seomyeon in Pusan)
Kim, Jong-Gu ; Wang, Sang-Min ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 55~62
The purpose of this research is to provide an a basic data for setting design standards and proposing improvement for public open space by analysis one which is the factor that quite influences public open space by factor analysis. First, Extract main design factors by survey and field investigation of the Public Open Space of Centum and Seomyeon in Pusan. After the extraction, Control and simulation of main design factors which selected by survey for making better improved public open space and resolving problems of it. Based on simulation data, the five-factors drawed by psychological estimation and factor analysis are Accessibility, Intimacy, Openness, Amenity, Convenience. By use of a result, Multiple Regression Analysis is implemented for correlation analysis between five-factors and user's satisfaction in the public open space. Therefore the it which influenced user's satisfaction in the public open space most was Accessibility. So, the public open space must be designed to improve Accessibility and Intimacy, Openness, Amenity, Convenience which influenced user's satisfaction were reviewed primary.
Determination of Passenger Car Equivalents When Estimating Capacity at Small 3-leg Roundabouts
Lee, Yong-Jae ; Lee, In-Gyeong ; Lee, Dong-Min ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 65~74
This study aims at developing a method for estimating passenger car equivalency (PCE) values for various vehicle types that could be considered in estimating capacity and delay at intersections without traffic signals, especially at modern small 3-leg roundabouts. Unlike signalized intersections, the PCE value has not yet been treated explicitly in traffic operations involving unsignalized intersections. Both empirical and theoretical approaches for determining the PCE values at modern small 3-leg roundabouts were evaluated. As a result, the PCEs derived in this study were highly correlated with those of field measurements.
Development of Shock Wave Delay Estimation Model for Mixed Traffic at Unsaturated Signalized Intersection
Kim, Won-Gyu ; Kim, Byeong-Jong ; Park, Myeong-Gyu ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 75~84
Controlled traffic intersection is critical point in terms of transportation network performance, where the most of traffic congestion arises. One of the most important and favorable measure of effectiveness in the signal controlled intersection is approach delay. Although lots of efforts to develop traffic delay estimation models have been made throughout the years, most of them were focusing on homogeneous traffic flow. The purpose of this research is to develop a traffic delay estimation model for traffic flow mixed with bus based on the horizontal shockwave theory. Traffic simulation is performed to test the adaptation level of the model in generic environment. The result shows that the delay increases with increasing bus traffic. Overall model accuracy comparing simulation result is acceptable, that shows the error range around 10 percent.
A Study on Development of Bus Bunching Duration Model
Kim, Eun-Gyeong ; No, Jeong-Hyeon ; Ryu, Si-Gyun ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 85~97
The present study aims at estimating the model of bus bunching duration along with its influential determinants in an attempt to understand the status of bus bunching being created by buses from various routes converging into one bus stop. To do so, the duration analysis, a well-known survival analysis, was adopted in order to capture the distribution of duration time as for 8 base lines, accordingly developing the model best fit for weibull distribution. Key attention to draw out the duration time model for bus bunching phenomena was laid, by analyzing 18 impact factors, on such criterion variables as number of berth, number of bus line in each berth and maximum capacity of on-and-off passengers in each line. Comparison in two typical types of bus lane was made between bus-only center lane(Dobong Mia-ro) and normal street-side lane(Tongil Euiju-ro). In this regard, the study, based on the model as above, suggested appropriate alternatives to improve the bus operation by effectively controlling bus bunching.
A Study on the Proper Position of Guide Sign for Bikeway in Korea
Jeong, Gyu-Su ; Lee, Yeong-In ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 99~108
Due to the recent emergence of global warming concerns, the UN has made the issue of climate change its top priority. Accordingly, Korea has announced a new national master plan titled, 'Participation in global efforts in climate change through -Low Carbon, Green Growth-'. As part of the plan, the constructions of bicycle path networks are being pushed forward. Although the building of bicycle paths and infrastructure is being implemented, little consideration has been given for bicycle path signage. This essay is the study of methodology in the installation of signs on bicycle paths. The research includes a theoretical study of the standard and installation position of signs with consideration of the geometry of bicycles as well issues such as the distance required for the bicyclist to recognize and understand the road sign and to take actions like stopping, In addition, experimental verification of the test results has been carried out. Also, the test on height of signs by changing the installation heights according to a bicyclist's forward vision angle has been conducted.
Development of Saturation Flow Rate Estimation Models Considering Workzone in the Vicinity of Signalized Intersections
Eo, Hyo-Gyeong ; Sin, Chi-Hyeon ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 109~120
This study aims to develop mathematical models for estimating saturation flow rates at the stop line of signalized intersection due to Workzones in the vicinity, since the saturation flow rate is the most critical parameter in capacity analysis for signalized intersections. It was found by reference review that saturation flow rates are sensitively influenced by the location of Workzone, the number of lanes, cycle length and effective green time. Extensive microscopic simulation runs were also performed and compared to the those of mathematical models for model verification. Mathematical models were developed based on traffic flow theory and dualizing them by the location of workzones. And then each result produced by changing important parameter values was carefully examined and analyzed. Small but consistent differences in saturation flow rate values between mathematical models and simulations exist. However, the pattern of changes in saturation flow rates depending on each variable was similar.
Development of the Method Estimating Sections Occurring Intensive PM10 in a Subway Tunnel (For the South Section (Cheongdam~Jangseungbaegi) of Subway Line 7 in Seoul)
Park, Jong-Heon ; Park, Jae-Cheol ; Eum, Seong-Jik ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 121~131
To effectively reduce PM10 generated in concourses and platforms of subway stations, a research is being conducted to find the PM10 source. The main source of PM10 in subway stations was PM10 generated in the main line tunnels, which was generated in proportion to the frequency of the train operation. Each amount of the PM10 generated when the train was operated once, was constant regardless of the time. On the assumption that the PM10 level in a tunnel of a line is a sum of newly generated amount of dust when the subway passes and the amount carried from the adjacent stations by the wind generated from the subway rolling stocks, the method which estimates the intensive PM10 occurring section was developed and applied to the 12 stations between Cheongdam and Jangseungbaegi in Seoul Subway Line 7.
Supply Chain-based Freight Distribution Channel Choice Model using Distribution Channel Analysis
Go, Yeong-Seung ; Park, Dong-Ju ; Kim, Chan-Seong ; Kim, Hyeon-Su ; Park, Min-Cheol ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 133~146
The objective of this study is to develop a supply chain-based freight distribution channel choice model considering shippers' logistics behaviors which will be used for freight demand estimation. For this purpose, this study utilized the distribution channel data of the petrochemical and automobile industries collected by KTDB center. The distribution channel choice models for these industries were developed by including transport mode, time, cost, and shipment size. It was found that the multinomial logit model with transport cost, time and shipment size is the best, and as shipment increases, bigger transport mode is preferred. Generally direct distribution channel with small truck was preferred over the one using distribution center and/or big truck.
Development of a Discriminant Model for Changing Routes considering Driving Conditions and Preferred Media
Choe, Yun-Hyeok ; Choe, Gi-Ju ; Mun, Byeong-Seop ; Go, Han-Geom ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 147~158
Studies on the distribution of traffic demands have been proceeding by providing traffic information for reducing greenhouse gases and reinforcing the road's competitiveness in the transport section, however, since it is preferentially required the extensive studies on the driver's behavior changing routes and its influence factors, this study has been developed a discriminant model for changing routes considering driving conditions including traffic conditions of roads and driver's preferences for information media. It is divided into three groups depending on driving conditions in group classification with the CART analysis, which is statistically meaningful. And, elements of the driving conditions and the preferred media affecting the change of paths are classified into statistical meaningful groups through the CHAID analysis, and the major factors affecting the change of paths are examined. Finally, the extent that driving conditions and preferred media affect a route change is examined through a discriminant analysis, and it is developed a discriminant model equation to predict a route change. As a result of building the discriminant model equation, it is shown that driving conditions affect a route change much more, the entire discriminant hit ratio is derived as 64.2%, and this discriminant equation shows high discriminant ability more than a certain degree.
Equilibrium trip distribution model
Im, Yong-Taek ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 159~166
Trip distribution is to connect travel demand for each OD pair based on travel cost, trip production and attraction derived from trip generation step. In real world the travel cost is a function of travel demand, but existing models could not fully consider such functional relation between travel cost and demand, which leads to an equilibrium in trip distribution model. This paper proves the equilibrium trip distribution by using gravity model. In order to obtain such equilibrium this paper also presents a solution algorithm based on fixed point theorem. The algorithm will be tested with an example and confirmed the equilibrium solution of trip distribution.
A Methodology for Assessing the Network Connectivity Improvement for Transport Hubs
Park, Jun-Sik ; Gang, Seong-Cheol ; Kim, Geo-Jung ;
Journal of Korean Society of Transportation, volume 28, issue 6, 2010, Pages 167~177
This study proposes a methodology for assessing the improvement of network connectivity of transport hubs. Extending a previously developed model that measures the connectivity of a node in transportation networks, we define two quantities called the supplied connectivity and the experienced connectivity. Using these quantities, we provide a systematic procedure for analyzing the network connectivity of a transport hub and also suggest criteria for determining whether a given project is effective in improving the network connectivity of the transport hub. The application of the methodology to a test site produces reasonable results, and as such it is expected that the methodology can be used for various transport hubs in the national road network. Once enough data from the application of the methodology are accumulated, a further study on the level of service in terms of network connectivity needs to be followed.