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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
Editor in Chief :
Volume & Issues
Volume 12, Issue 6 - Dec 2013
Volume 12, Issue 5 - Oct 2013
Volume 12, Issue 4 - Aug 2013
Volume 12, Issue 3 - Jun 2013
Volume 12, Issue 2 - Apr 2013
Volume 12, Issue 1 - Feb 2013
Selecting the target year
A Study on the Travel Speed Estimation Using Bus Information
Bin, Mi-Young ; Moon, Ju-Back ; Lim, Seung-Kook ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 1~10
DOI : 10.12815/kits.2013.12.4.001
This study was conducted to investigate that bus information was used as an information of travel speed. To determine the travel speed on the road, bus information and the information collected from the point detector and the interval detection installed were compared. If bus information has the function of traffic information detector, can provide the travel speed information to road users. To this end, the model of recognizing the traffic patterns is necessary. This study used simple moving-average method, simple exponential smoothing method, Double moving average method, Double exponential smoothing method, ARIMA(Autoregressive integrated moving average model) as the existing methods rather than new approach methods. This study suggested the possibility to replace bus information system into other information collection system.
Development of Signal Control Strategy for Oversaturated Intersections Using Wayside Video Equipment
Lee, Hyun ; Kim, Won-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 11~21
DOI : 10.12815/kits.2013.12.4.011
The conventional real-time signal control strategy for oversaturated situation generally requires a number of detectors at the intersection in order to identify the queue length at each approach. Also, existing strategy for the spillback has limited effect due to the temporal spillback control which only reduce the green split at the approach. In this study, a signal control system utilizing the imagery information from ITS roadside equipment is developed for operation of oversaturated intersections. The strategy calculates the saturation ratio based on the queue length extracted from ITS RSE, and designs the signal control variables according to the saturation ratio. The signal control strategy is divided into two phases: oversaturated and supersaturated. In oversaturated conditions, timing plan for main approach is optimized by the queue length. In oversaturated conditions where spillback might occur, the signal timing is designed in order to avoid the spillback. To increase field adaptability, the strategy is designed to adjust the split length, all-red-time, and clearance time, and keep the major signal control variables intact. The result of the simulation shows that in oversaturated conditions, the improvement is similar to the real-time signal control system. In case of, oversaturated conditions, however, the effect of the strategy is superior to that of a real-time system.
Estimation of Hi-pass Traffic Dispersion Rates to Determine The Optimal Location of Hi-pass Lanes at A Toll Plaza
Lee, Jaesoo ; Lee, Ki-Young ; Lee, Cheol-Ki ; Yun, Ilsoo ; Yu, Jeong Whon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 22~32
DOI : 10.12815/kits.2013.12.4.022
Since the percentage of vehicles equipped with Hi-pass, an electronic toll collecting device, has increased rapidly, it is very crucial to determine the optimal location of Hi-pass lanes at a toll plaza in terms of traffic control and operation. In this study, the appropriateness of existing Hi-pass lanes of a toll plaza is evaluated considering its physical geometry and traffic characteristics. A new evaluating criterion called "traffic dispersion rate" is developed in order to measure the level of traffic spreading across the toll booth lanes at a toll plaza. Logistic regression models are constructed to estimate the relationship between the traffic dispersion rate and its affecting variables. The model estimation results show that several variables including Hi-pass lane traffic volume, length of toll plaza, entering/exiting taper lengths, and locations of Hi-pass lanes. The results also suggest that traffic dispersion rate can be increased by adjusting the location of Hi-pass lanes. The study enables us to quantify traffic dispersion rate which can be used to optimize the location and operation of Hi-pass lanes at toll plazas.
Study on Determinant of Mode Choice based on Analysis on Median Exclusive Bus Lane Effects
Kim, Myung-Soo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 33~43
DOI : 10.12815/kits.2013.12.4.033
Comparing to the constant-increasing number of vehicles, road facilities supply such as road construction has already reached the uppermost limit. As one of the most serious issues that the public would personally deal with every day, such is some road traffic problem to be solved instantly. Median exclusive bus lane is now being conducted as a way to enhance efficiency of the public transportation system in Transportation System Management, and with a main arterial that connects Kyeryong-ro (Wolpyeong 3~West Daejeon 4, 6.3km) and Daedeok-daero (Daedeok Bridge 4~Kyeryong 4, 2.6km) in Daejeon adopted as a research target, the study analyzed effects of the arterial by VISSIM the microsimulation. During the analysis, the study focused on figuring out effects of owner-drivers' transport mode choice to take a bus a public transit. According to the simulation results, as people take a bus at the median exclusive bus lane not crb bus lane, traffic for general vehicles has been negatively effected with less drive ways for the vehicles. However, when it comes to the bus traffic, the new transport mode choice appeared to have a quite positive influence after all. A binary logit model analysis reported that owner-drivers might take a bus more often when they earn lower incomes, when they do not travel far, when poor parking is expected and lastly, when they are familiar with using the median exclusive bus lane.
Prediction of Speed by Rain Intensity using Road Weather Information System and Vehicle Detection System data
Jeong, Eunbi ; Oh, Cheol ; Hong, Sungmin ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 44~55
DOI : 10.12815/kits.2013.12.4.044
Intelligent transportation systems allow us to have valuable opportunities for collecting reliable wide-area coverage traffic and weather data. Significant efforts have been made in many countries to apply these data. This study identifies the critical points for classifying rain intensity by analyzing the relationship between rainfall and the amount of speed reduction. Then, traffic prediction performance by rain intensity level is evaluated using relative errors. The results show that critical points are 0.4mm/5min and 0.8mm/5min for classifying rain intensity (slight, moderate, and heavy rain). The best prediction performance is observable when previous five-block speed data is used as inputs under normal weather conditions. On the other hand, previous two or three-block speed data is used as inputs under rainy weather conditions. The outcomes of this study support the development of more reliable traffic information for providing advanced traffic information service.
Analysis of Choice model for EV Charger Types and willingness to pay for Charging Rate based on Logit model
Byun, Wan Hee ; Lee, Kihong ; Kee, Ho Young ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 56~65
DOI : 10.12815/kits.2013.12.4.056
The word is endeavoring to reduce greenhouse gases with the sense of crisis caused by the continuous climate change. As a method to decrease greenhouse gases, motors driven by fossil fuels are being substituted by EV in the field of transportation. Meanwhile, for the spread of EV, charging installations are divided into general charging type and quick charging type. Also, charging amount and time are main factors to decide charging pay. But, because the opportunity coast for the charging time varies depending on the private situations, it is very important to understand exact phenomenon for the spread of EV charging installations and charging pay policy. Therefore this paper suggested the choice model of charging installation and time value in various situations by using Logit model to make clear the relationship between a choice of charging installation, charging time and willingness to pay for charge.
A Dual-channel Receiver for Spintronics Oscillator Array
Oh, Inn-Yeal ; Park, Seung-Young ; Park, Chul-Soon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 66~75
DOI : 10.12815/kits.2013.12.4.066
The spin modulation is proposed with modulating frequency and amplitude simultaeously, and realized with the array sturcture easily located due to the nanometer size of the spintronics oscillator. In this paper, the dual-channel receiver is deisgned for detecting the spin modulated signal. Resultly, we confirmed the dual-channel recevier well detected the data sent through the spintronics oscillator array, and processed up to 200 kbps on each channel. Distance is limited up to 1 cm due to the low level signal under -60 dBm. The realized dual-channel receiver has the size of
An Adaptive Hybrid Filter for WiFi-Based Positioning Systems
Park, Namjoon ; Jung, Suk Hoon ; Moon, Yoonho ; Han, Dongsoo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 76~86
DOI : 10.12815/kits.2013.12.4.076
As the basic Kalman filter is limited to be used for indoor navigation, and particle filters incur serious computational overhead, especially in mobile devices, we propose an adaptive hybrid filter for WiFi-based indoor positioning systems. The hybrid filter utilizes the same prediction framework of the basic Kalman filter, and it adopts the notion of particle filters only using a small number of particles. Restricting the predicts of a moving object to a small number of particles on a way network and substituting a dynamic weighting scheme for Kalman gain are the key features of the filter. The adaptive hybrid filter showed significantly better accuracy than the basic Kalman filter did, and it showed greatly improved performance in processing time and slightly better accuracy compared with a particle filter.
Analyzing the Changes in Speed Due to High Occupancy Vehicles Using Median Bus Lane
Lee, Jung-Beom ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 87~94
DOI : 10.12815/kits.2013.12.4.087
This study estimated the changes in delays and speeds of vehicles in exclusive bus lane and road when the High Occupancy Vehicles(HOV) use the median bus lane. Synchro simulation tool was used to optimize the traffic signal time on the network and VISSIM was applied to simulate various scenarios. Here, drivers behavior parameters in VISSIM was optimized using Simultaneous Perturbation Stochastic Approximation(SPSA) algorithm in order to represent real traffic condition. Based on the simulation results, the delay in Doan daero was decreased when the volume of HOV in current condition runs on the median bus lane, whereas delay in Doan dongro was increased in all scenarios. The changes in bus speed was not sharply decreased for both study sites, even though the number of HOV increased to 10%. Thus, it could be allowed that the HOV use the median bus lane in Doan dongro and Doan daero. Future research tasks include studying about changes in delay when the HOV use the curb bus lane.
A Study on RFID Code Structure for Traceability System of Electric Vehicle Batteries
Kim, Woo-Ram ; Chang, Yoon-Seok ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 4, 2013, Pages 95~104
DOI : 10.12815/kits.2013.12.4.095
As global warming and depletion of fossil fuel are considered as urgent problems, the development of electric vehicle (EV) is getting more attention by automobile industry. However, the wide adoption of EVs is not coming yet, because of many issues such as long recharging time and high cost of batteries etc. As an alternative solution to the conventional battery charging EV, the idea of battery exchanging EV is introduced. To realize the battery exchanging business model, one should solve the issues of ownership and reliability of battery. To address such issues, the concept of battery sharing should be considered together with good traceability system. In this study, we studied RFID code structure to provide better visibility and traceability for shared EV batteries. The proposed RFID code and code generation system is based on GRAI-96 of EPCglobal and included factors such as chemical, physical, and manufacturing features. The designed code can be also used as the ID of each battery.