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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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Korean Society of Transportation
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Volume & Issues
Volume 33, Issue 6 - Dec 2015
Volume 33, Issue 5 - Oct 2015
Volume 33, Issue 4 - Aug 2015
Volume 33, Issue 3 - Jun 2015
Volume 33, Issue 2 - Apr 2015
Volume 33, Issue 1 - Feb 2015
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Methodology for Calculating Surrogate Safety Measure by Using Vehicular Trajectory and Its Application
PARK, Seongyong ; LEE, Chungwon ; KHO, Seung-Young ; LEE, Yong-Gwan ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 323~336
DOI : 10.7470/jkst.2015.33.4.323
Estimating the risks on the roadway using surrogate safety measures (SSM) has an advantage in that it focuses on the vehicle trajectory directly involved in conflicts. On the other hand, there is a restriction on estimating the risks of continuous segments due to the limited data collected from a location. To overcome the restriction, this study presents the scheme of acquiring the vehicular trajectory using real time kinematics-differential global positioning system (RTK-DGPS) and develops a methodology which contains the considerations of the problems to calculate the SSM such as time-to-collision (TTC), deceleration rate to avoid collision (DRAC) and acceleration noise (AN). By using the methodology, this study shows a result from an experiment executed in a section where the variation of vehicular movement can be observed from several continuous flow roadway sections near Seoul and Gyeonggi Province in Korea. The result illustrated the risks on the roadway by the SSM metrics in certain situations like merging and diverging, stop-and-go, and weaving. This study would be applied to relate the dangers with characteristics of drivers and roadway sections, and prevenst accidents or conflicts by detecting dangerous roadway sections and drivers` behaviors. This study contributes to improving roadway safety and reducing car-accidents.
An Estimation of the Minimum Distance Between a Roundabout and Signal Crosswalk Using VISSIM
KIM, Young Beom ; LEE, Dongmin ; Jun, Jin Woo ; Cho, Hanseon ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 337~347
DOI : 10.7470/jkst.2015.33.4.337
Since the application of roundabouts by 2010 have been started, more than 350 roundabouts were installed in Korea. Recently the types of constructed roundabouts become various, and the intersection conditions for installing roundabouts were also various. However, there were some difficulties to install roundabouts around school zone due to safety problems. In this study, appropriate distance from adjacent signal crosswalks to roundabouts were estimated for securing pedestrian safety and operation efficiency around school zone. With the analyses, the minimum distance standard was suggested to obtain operational effectiveness of roundabout according to traffic volume, traffic flow, pedestrian green time and secures pedestrian safety and convenience. In this paper, average delay of roundabout as various length of distances between an adjacent crosswalk and a roundabout as different pedestrian signal times, traffic volumes, traffic flow rates were analyzed. Through this study, it was found that about four times of delay in a roundabout was generated if there was adjacent signal crosswalk. However if there is enough distance between an adjacent crosswalk and a roundabout, the value of increasing delay on roundabouts with adjacent a signalized crosswalk can be considerably reduced. Critical value of the distance between a roundabout and a signal crosswalk in case of roundabouts within 200-500 vehicle/hour/lane entry traffic flow, 20-40% of left turn traffic, and over 15 seconds pedestrian green time was about 50 meters. In conclusion, if there is minimum 40 meter distance from roundabouts, adjacent signal crosswalks can be installed and operated for students` safety around school zone.
Development of Elderly Walking Independence Index Model
ROH, Chang-Gyun ; PARK, Bum Jin ; MOON, Byungsup ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 348~356
DOI : 10.7470/jkst.2015.33.4.348
In 2026, in ten years from now, Korea is expected to enter into a super aged society. By facing this social phenomenon, analyzing the elderlies and preparing measures are needed among society. In the transportation field, the traffic accidents which are related to the elderly pedestrians have drastically increased so that R&D projects and policy supplementations are introduced. However very few base studies on which focused on the behavior, capability, impact factors analysis of for elderly pedestrians are conducted. To determine the walking capability, this study divided the walking capability into 3 three categories - general, health and exercise. It carries out the comprehensive survey targeting 52 elderlies with the average age of 72.6 years and this survey is made up of total 12 factors in the 3 three categories. This survey also is conducted with various measuring devices and methods such as interview, National Fitness Award, SPBB, Cybex and the like for. From the 12 detailed factors, the general factors such as age, physical shape and so forth have little impact on the walking speed. However the factors that have the greatest impact on the walking speed are extensor muscle on lower limbs in the health factors and balance, coordination, and SPPB in the exercise factors. With these results, this study develops the independent walking model which can measure the walking capability of the elderly people. The developed model is expected to be utilized as the base study for elderly`s walking patterns in the transportation field by examining the walking capability of the older people.
Integrated Management Strategy of Vehicle Emission Reduction Policies Based on Total Benefits and Co-benefits
LEE, Kyu Jin ; PARK, Kwan Hwee ; SHIM, Sang Woo ; CHOI, Keechoo ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 357~367
DOI : 10.7470/jkst.2015.33.4.357
This study aims to propose integrated management strategies based on the relationship between co-benefits and total benefits of greenhouse gases and air pollutant emissions for establishing a transport and environmental policy. The results show that the integrated management of the following policies: `Car Free Day` and `Early Scrapping of Decrepit Diesel Vehicle`, which are used for reducing reduce gasoline and diesel, can together reduce both PM and
emissions and increase total benefits. In addition, the integrated management of `Car Free Day` with environment policies and `Congestion Charge` with environment policies simultaneously controls the three factors which influence emissions, including travel volume, travel speed and emissions factor, and was found to be effective in terms of co-benefits. This study reduces both air pollutants, which are harmful to health, and greenhouse gas emissions, which influence climate change, and improves the efficiency of policy through the integrated management of policies.
A Comparative Study on Job Satisfaction of Road Freight Transportation Industry Workers by Type of Employment
YOO, Heon Jong ; AHN, Seung Bum ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 368~378
DOI : 10.7470/jkst.2015.33.4.368
This study aims to analyse the differences of job satisfaction in road freight transportation industry workers by different types of employment. The researchers utilized reliability test and factor analysis to estimate the validity and feasibility of the questionnaire. Multivariate analysis of variance (MANOVA) was also applied to assess the differences of job satisfaction level by different employment types. The results of reliability test and factor analysis clearly show that questionnaire samples are reliable and feasible. The multivariate analysis of variance result shows statistical insignificance in the level of job satisfaction between part-time workers and special type ones. On the other hand, there was a significant difference between full-time workers and those in other types of employment. The significant variables such as income, welfare, and working hour, etc were discovered.
Classification of Domestic Freight Data and Application for Network Models in the Era of `Government 3.0`
YOO, Han Sol ; KIM, Nam Seok ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 379~392
DOI : 10.7470/jkst.2015.33.4.379
Freight flow data in Korea has been collected for a variety of purposes by various organizations. However, since the representation and format of the data varies, it has not been substantially used for freight analyses and furthermore for freight policies. In order to increase the applicability of those data sets, it is required to bring them in a table and compare for finding the differences. Then, it is shown that the raw data can be aggregated by a particular criterion such as mode, origin and destination, and type commodity. This study aims to examine the freight data issue in terms of three different points of view. First, we investigated various freight volume data sets which are released by several organizations. Second, we tried to develop formulations for freight volume data. Third, we discussed how to apply the formulations to network models in which particular OR (Operations Research) techniques are used. The results emphasized that some data might be useless for modeling once they are aggregated. As a result of examining the freight volume data, this study found that 14 organizations share their data sets at various aggregation levels. This study is not an ordinary research article, which normally includes data analysis, because it seems to be impossible to conduct extensive case studies. The reason is that the data dealt in this study are diverse. Nevertheless, this study might guide the research direction in the freight transport research society in terms of data issue. Especially, it can be concluded that this study is a timely research because the governmemt has emphasized the importance of sharing data to public throughout `government 3.0` for research purpose.
Development and Implementation of a 2-Phase Calibration Method for Gravity Model Considering Accessibility
CHOI, Sung Taek ; RHO, Jeong Hyun ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 393~404
DOI : 10.7470/jkst.2015.33.4.393
Gravity model has had the major problem that the model explains the characteristics of travel behavior with only deterrence factors such as travel time or cost. In modern society, travel behavior can be affected not only deterrence factors but also zonal characteristics or transportation service. Therefore, those features have to be considered to estimate the future travel demand accurately. In this regard, there are two primary aims of this study: 1. to identify the characteristics of inter-zonal travel, 2. to develop the new type of calibration method. By employing accessibility variable which can explain the manifold pattern of trip, we define the zonal travel behavior newly. Furthermore, we suggest 2-phase calibration method, since existing calibration method cannot find the optimum solution when organizing the deterrence function with the new variables. The new method proceeds with 2 steps; step 1.estimating deterrence parameter, step 2. finding balancing factors. The validation results with RMSE, E-norm, C.R show that this study model explains the inter-zonal travel pattern adequately and estimate the O/D pairs precisely than existing gravity model. Especially, the problem with estimation of short distance trip is overcomed. In conclusion, it is possible to draw the conclusion that this study suggests the possibility of improvement for trip distribution model.
Study on the Drivers` Response Characteristics Using Spectral Analysis of Car Following Data
CHAE, Chandle ; OH, Sei-Chang ; KIM, Youngho ; LEE, Jun ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 405~416
DOI : 10.7470/jkst.2015.33.4.405
This paper developed a method analyze drivers` response characteristics using spectral analysis with car following data. Cross-correlation function and cross spectrum are produced by Fourier transform from speed fluctuations of leading vehicle and following vehicle during the designated time
. Based on the analysis data, a process to calculate the reaction time and stimulus-adaption index of following vehicle was developed and 170 cases of field data was applied. It was reported average of 0.654 and 2.091 seconds of stimulus-adaption index and reaction time respectively. In conclusion, the developed indexes might contribute to enhance vehicle control of autonomous vehicle more efficient and safer.
Development of a Novel Integrated Evaluation Index for Freeway Traffic Data
PARK, Hyunjin ; YOON, Mijung ; KIM, Hae ; OH, Cheol ;
Journal of Korean Society of Transportation, volume 33, issue 4, 2015, Pages 417~429
DOI : 10.7470/jkst.2015.33.4.417
Evaluation of traffic data quality is a backbone of better traffic information and management systems because it directly affects the reliability of traffic information. This study developed an integrated index for evaluating the quality of archived intelligent transportation systems (ITS) data. Two novel indices including spatio-temporal consistency and severity of missing data were devised and integrated with existing indices such as availability and completeness. An evaluation framework was proposed based on the developed integrated index. Both analytical hierarchical analysis (AHP) technique and entropy method were adopted to derive mixed weighting values to be used for the integrated index. It is expected that the proposed methodology would be effectively used in enhancing the quality of traffic data as a part of traffic information system.