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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of The Korea Institute of Intelligent Transport Systems
Journal Basic Information
Journal DOI :
The Korea Institute of Inteligent Transport Systems
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Volume & Issues
Volume 15, Issue 4 - Aug 2016
Volume 15, Issue 3 - Jun 2016
Volume 15, Issue 2 - Apr 2016
Volume 15, Issue 1 - Feb 2016
Selecting the target year
Evaluation and Model Development of Transfer Resistance Factors for Bulk Freight Transportation
Choi, Chang-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 1~11
DOI : 10.12815/kits.2016.15.3.001
The present study aims to evaluate transfer resistance factors in railway stations and draw new implications. The data used for the model estimation are RP (revealed preference) data and SP (stated preference) data. Two types of models were used for the analysis: integration model which combined line-haul stage, transfer stage and shuttle stage and separation model which assessed the three stages separately. The results revealed that while bulk freight shippers mainly focused on line-haul stage, they put emphasis on transfer stage as well. It's especially notable that transfer stage was considered more important than shuttle stage. Therefore, in future transportation policies concerning rail freight, it would be crucial not only to enhance the competitiveness of line-haul stage but also make improvements in transfer stage regarding railway stations.
Factor Analysis Influencing Pedestrian Volumes Based on Structural Equation Models
Kim, Tae-hyun ; Oh, Ju-taek ; Lee, Kyu-hoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 12~22
DOI : 10.12815/kits.2016.15.3.012
Walking behaviors are one of the most basic transport modes in daily life. As a result, the efforts and concerns on pedestrians are consistently increased. This study tried to reveal significant factors for pedestrian volumes through structural equation models and compare the impacts of the whole time of day, off-peak time, peak time on the pedestrian volumes. The results of the analysis show that commercial business factors, accessibility factors, walking environment factors are the most significant factors that increase pedestrian volumes. Whereas, housing factors do not contribute to increase the pedestrian volumes. In the non-peak time, the weight of commercial business factors is higher than the whole time of day, while the weight housing factors, accessibility factors, walking environment factors are lower. In the peak time, however, the weight of commercial business factors decreases rather than the whole time of day, while the weight of the other factors increase.
Identification of Key Factors of Travel Time Budget by Mode in Seoul: Using Seemingly Unrelated Regression Model
Kim, Su-jae ; Lim, Su-yeon ; Choi, Sung-taek ; Choo, Sang-ho ; Ahn, Woo-young ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 23~33
DOI : 10.12815/kits.2016.15.3.023
This study identified the factors that affect travel time budget by mode for traveler in Seoul using the SUR model. Individual, household and TAZ characteristics were selected as the explanatory variables. Transportation modes are summarized from 18 types to 6 types(walking, personal car, bus, subway, rail and bicycle). The results showed a distinct difference between personal transportation and public transportation. First of all, People who owned a car and driver's licence tend to prefer personal transportation. In addition, we can confirm the relationship between the bus and the subway which are most typical public transportation. Passengers who can available a personal mode preferred the subway than the bus. It is expected to suggest various implications related to the public transportation policy for Seoul metropolitan area.
Comparison of the Methodologies for Calculating Expressway Space Mean Speed Using Vehicular Trajectory Information from a Radar Detector
Han, Eum ; Kim, Sang Beom ; Rho, Jeong Hyun ; Yun, Ilsoo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 34~44
DOI : 10.12815/kits.2016.15.3.034
This study was initiated to evaluate the performance of methodologies to estimate the space mean speed(SMS) using the time mean speed(TMS) which was collected from the vehicle detection system(VDS) in expressways. To this end, the methodologies presented in prior studies were firstly summarized. It is very hard to achieve exact SMSs and TMSs due to mechanical and communication errors in the field. Thus, a microscopic traffic simulation model was utilized to evaluated the performance. As a result, the harmonic mean and volume-distance weighted harmonic mean were close to the SMS in the case in which the TMSs of individual vehicles were used. However, when the 30-second-interval aggregated TMS were used, the volume-distance weighted harmonic mean was outstanding. In this study, a radar detector was installed in the Joongbu expressway to collect the SMS. The trajectory of individual vehicles collected from the detector were used to calculate the SMS, which was compared with the estimates using other methodologies selected in this study. As a result, the volume-distance weighted mean was turned out to be close to the SMS. However, as the congestion becomes severe. the deviation between the two speed becomes bigger.
Study on Queue Length Estimation using GPS Trajectory Data
Lee, Yong-Ju ; Hwang, Jae-Seong ; Lee, Choul-Ki ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 45~51
DOI : 10.12815/kits.2016.15.3.045
Existing real-time signal control system was brought up typical problems which are supersaturated condition, point detection system and loop detection system. For that reason, the next generation signal control system of advanced form is required. Following thesis aimed at calculating queue length for the next generation signal control system to utilize basic parameter of signal control in crossing queue instead of the volume of real-time through traffic. Overflow saturated condition which was appeared as limit of existing system was focused to set-up range. Real-time location information of individual vehicle which is collected by GPS data. It converted into the coordinate to apply shock wave model with an linear equation that is extracted by regression model applied by a least square. Through the calculated queue length and link length by contrast, If queue length exceed the link, queue of downstream intersection is included as queue length that upstream queue vehicle is judeged as affecting downstream intersection. In result of operating correlation analysis among link travel time to judge confidence of extracted queue length, Both of links were shown over 0.9 values. It is appeared that both of links are highly correlated. Following research is significant using real-time data to calculate queue length and contributing to signal control system.
A Traffic congestion judgement Algorithm development for signal control using taxi gps data
Lee, Choul Ki ; Lee, Sang Deok ; Lee, Yong Ju ; Lee, Seung Jun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 52~59
DOI : 10.12815/kits.2016.15.3.052
COSMOS system which was developed in Seoul for real-time signal control was designed to judge traffic condition for practicing signal operation. However, it occurs efficiency problem that stop line detection and queue length detection could not judge overflow saturation of street. For that reason, following research process GPS data of Seoul city's corporationowned taxi to calculate travel speed that excluded existing system of stop line detection and queue length detection. Also, "Research of calculating queue length by GPS data" which was progressed with following research expressed queue length. It is based on establishing algorithm of judging congestion situation. The algorithm was applied to a few areas where appeared congestion situation consistently to confirm real time traffic condition with established network. [Entrance of the National Sport Institute
Gangnam station Intersection, Yuksam station intersection
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A Heuristic Optimal Path Search Considering Cumulative Transfer Functions
Shin, Seongil ; Baek, Nam Cheol ; Nam, Doo Hee ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 60~67
DOI : 10.12815/kits.2016.15.3.060
In cumulative transfer functions, as number of transfer increase, the impact of individual transfer to transfer cost increase linearly or non linearly. This function can effectively explain various passengers's travel behavior who choose their travel routes in integrated transit line networks including bus and railway modes. Using the function, it is possible to simulate general situations such that even though more travel times are expected, less number of transfer routes are preferred. However, because travel cost with cumulative transfer function is known as non additive cost function types in route search algorithms, finding an optimal route in integrated transit networks is confronted by the insolvable enumeration of all routes in many cases. This research proposes a methodology for finding an optimal path considering cumulative transfer function. For this purpose, the reversal phenomenon of optimal path generated in route search process is explained. Also a heuristic methodology for selecting an optimal route among multiple routes predefined by the K path algorithm. The incoming link based entire path deletion method is adopted for finding K ranking path thanks to the merit of security of route optimality condition. Through case studies the proposed methodology is discussed in terms of the applicability of real situations.
The National Standard Real Situation Conformance Test System for a Nation-wide Interoperable Transportation Card
Nam, Na-kyung ; Lee, Soo-kyung ; Lee, Ki-han ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 68~76
DOI : 10.12815/kits.2016.15.3.068
The pre-paid nation-wide interoperable transportation card, which an pay fee of bus, subway, train, and highway with just one card, released in June. 2014. It has started and operated from Seoul, Gyeonggi, and major local metropolitan area. In this paper, after starting of service, we evaluate conformance and interoperability of nation-wide interoperable transportation card system in real situation. Through this, we check the status of its technical operation. For this, we choose 6 region included Seoul, Gyeonggi which are serviced by different transport vendors and check recognition and billing result from field of transportation card terminal. As a result, we can reach that the major nation-wide interoperable transportation card operate normally and deliver CONFIG DF query command. It means nation-wide interoperable transportation card system which use only one card stably adapt the public transport system and it can make user's public transport use convenience higher through the extension of service area.
Development of a Fuel-Efficient Driving Strategy in Horizontal Curve Section
Jeong, Yangrok ; Bae, Sanghoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 77~84
DOI : 10.12815/kits.2016.15.3.077
In 2012, total GHG emissions in transport sector reached 88 Million ton CO2eq. The emissions generated in the road accounted for 94% of the transport sector. Currently, there are many efforts to operate an education and campaign for eco-driving. However study for eco-friendly vehicle control considering road alignment is limited. Therefore, the purpose of this study is to address fuel-efficient driving strategy in horizontal curve section. To fulfill the goal, designed ideal freeway horizontal curve road follows regulations about road structure. And safety speed is calculated for considering vehicle's safety on horizontal curve road. Authors composed the acceleration and deceleration scenario for each horizontal curve section and generated the speed profiles that are limited by the safety speed. Speed profiles are converted into force that horizontal curve affect to fuel consumption. Then, we calculated fuel consumption using Comprehensive Modal Emission Model. Then, we developed eco-driving strategy by selecting most fuel-efficient scenario. To validate this strategy, we selected study site and compared fuel consumption for eco and manual driving. As the result, fuel consumption when driver used eco-driving was lessened by 20.73% than that of manual driving.
Pedestrians and Drivers Behaviour Change by Installation of Crossing Safety Assistant System
Jin, Min-Soo ; Lee, Suk-Ki ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 85~93
DOI : 10.12815/kits.2016.15.3.085
According to Traffic Accident Statistics, the fatalities of accident while crossing is over represented. So, more active safety countermeasure should be considered to reduce the frequency and degree of severity of pedestrian-crossing involved accidents. The study analyses the safety effects of the Crossing Safety Assistant System which is composed of Led-embedded crosswalk lightings, text displayer and audio waning device for the safety consciousness both pedestrian and vehicles at crosswalk area. Operating speed of vehicles is reduced with statistical significance, and the level of vigilance expressed by pedestrian head movement to check out the vehicle existence is improved.
A Study on the Travel Characteristics of Administrative Unit by Factor and Cluster Analysis: Focused on Incheon Metropolitan City
Lee, Seul-gi ; Choi, Eun-jin ; Kim, Eung-cheol ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 94~104
DOI : 10.12815/kits.2016.15.3.094
In this study, factor and cluster analysis are used to classify characteristics of the administrative basic unit, "Dong", of the Incheon Metropolitan City. Travel characteristics of the classified groups are then analyzed through databases to provide directions of urban transportation planning. First, industrially developed administrative-dong show a high commuting volume by using cars. Thus the analysis indicated the need to staggering work-hour system and signal operating system policy. Second, commercially developed administrative-dong show heavy use of public transportation and long distance commute as well as high volume of shoppers. The analysis indicated the need to improve road infrastructure. Third, densely populated administrative-dong show a high rate of commute to work and school as well as long hours of commuting. Thus the analysis indicated the need to improve road transportation policies during rush hours. Fourth, administrative-dong with multiple characteristics feature heavy pedestrian traffic thus the study analyzed the need to improve pedestrian environment policies. Lastly, administrative-dong in close proximity to train stations feature extensive use of biking as well as high volume of shoppers and students commuting. Thus the study analyzed the necessity to have plans to enhance accessibility.
The LOS Analysis of Railway Station Facilities Based on Design Hourly Factor and Simulation
Oh, Tae-ho ; Lee, Seon-ha ; Cheon, Choon-keun ; Kim, Eun-ji ; Yu, Byung-young ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 105~117
DOI : 10.12815/kits.2016.15.3.105
Recently the passenger of railway satisfaction levels are lowered. the reason why the railway station was built without considering the increased passenger due to diversification(transfer, shopping, and etc.) of the domestic railway station infrastructure. Especially, in case of KTX Gwangju-Songjeong Station, the number of its passenger has been increased about more than three times since its opening in 2015, so that there are much inconvenience generated in the station congested with passengers. his study aims to excute using Pedestrian simulation and Design Hourly Factor concepts of Highway Engineering, in order to designing the optimum area through the passenger demand forecast for each station. For this analysis was divided into the second stage. Frist, the railway passenger was calculated by using the methodology of Design Hourly Factor that is used during road design in the aspect of traffic engineering. Second, we tried to analyze the level of service in each railway station facility through the pedestrian simulation. Analytical results show that utilizing pedestrian simulation provides verification for calculation of LOS of each railway station facility. Therefore, In the future when designing railway station of facilities will be possible to suggest the facilities area based on LOS.
A Study on the User Satisfaction of Demand Response Transport(DRT) by Quantile Regression Analysis
Jang, Tae Youn ; Han, Woo Jin ; Kim, Jeong Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 118~128
DOI : 10.12815/kits.2016.15.3.118
As the rural areas have experienced the population reduction and the aging, the service level of public transit decreases. This study analyzes the effecting factor to user satisfaction of demand response transport(DRT) as alternative to rural public transit by the quantile regression that aims at estimating either the conditional median or other quantiles of the response variable. Jeonbuk Province tested DRT operations in Dongsang of Wanju County and Sannae of Jeongup City each in 2015. The user DRT satisfaction of Wanju was higher than one of Jeongup in basic statistics analysis. The difference in satisfaction between higher quantile and lower quntile of Wanju is smaller than one of Jeongupy as a result of quantile regression analysis. Also, Wanju DRT continues the second test operation of DRT as satisfaction from Ordinary Least Squares(OLS) close to higher satisfaction quantile.
A Study on Level of Service of Sidewalk and Satisfaction of Pedestrian
Kwon, Wantaeg ; Kim, Sangyoup ; Choi, Jaisung ; Kim, Taeho ; Jang, Youngsoo ; Kim, Jinsub ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 129~145
DOI : 10.12815/kits.2016.15.3.129
This paper analyzed and compared the service level and satisfaction of the sidewalks in collector roads from 6 different location, which has a lot of volume of pedestrians. For the study, it performed an investigation of road geometry, flow, research about satisfaction of walking and video recording. Based on this data, this study computed the service level of the sidewalks and pedestrian satisfaction. This study made a sense of correlation between service level and satisfaction. Also it focused on factors influencing on the effectiveness of satisfaction. This study also analyzed the change of walking behavior chracteristics according to the change of the level of satisfaction. This study adopted Multi-Modal Level of Service(MMLOS) method, because it could consider more factors. This study reached the conclusion that MMLOS method cannot completely reflect the level of pedestrian satisfaction. We have to consider more factors than in the current system for use in the development of sidewalk design. The result of this study is expected to reflect the pedestrian satisfaction in future sidewalks design.
Parallel Coding Scheme for Flicker Mitigation in MIMO-VLC
Jeong, Jin-uk ; Lee, Kye-san ; Seo, Hyo-duck ; Han, Doo-hee ; Lee, Kyu-jin ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 15, issue 3, 2016, Pages 146~154
DOI : 10.12815/kits.2016.15.3.146
Visible light communication using LED is a technique for transmitting digital data using the light of the LED. Recently, high-speed data rate plays an important role. Therefore, many scholars have researched the MIMO-VLC which is able to increase data rate using a lot of LED transmitters. However, it has problems such as light interference and flicker when transmitting different bit. Many researcher have focused on reduce interference. However it is not considered about flicker problem. Flicker is defined unstable brightness. It occurred the tired of human eyes, lowers eyesight and also decreases concentration. In order to solve this flicker problem in MIMO-VLC, we propose the PFM(Parallel Flicker Mitigation) code. PFM code using combinatorial theory can maintain constant brightness the whole bit duration. Therefore, it is possible to assure the brightness by confirm simulation results.