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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 4, Issue 3 - Dec 2005
Volume 4, Issue 2 - Aug 2005
Volume 4, Issue 1 - Apr 2005
Selecting the target year
A Study on Rule-Based Vehicle Tracking in Video Images
Park Eun-Jong ; Lee Joon-Whan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 1~11
Automatic tracking of vehicles is important to accurately estimate the vehicle speeds in video-based traffic measurement systems and to analyze traffic flows for road construction. This paper proposes a carefully designed rule-based tracking scheme that considers the possible cases that can be appeared in the video-based vehicle racking. The proposed scheme is fast and outperforms the Mean-Shift scheme in terms of accuracy. The accuracy and the speed of the scheme would be increased by combining it with color-based searching and Kalman filters.
The Development of Traffic Queue Length Estimation Algorithm Using the Occupancy Rates
Kang Jihoon ; Oh Young-Tae ; Kang Jeung-Sik ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 13~22
The purpose of this research is how to estimate the traffic queue length in the signal intersection accurately. The current traffic queue length algorithm in COSMOS has been using the congestion diagram which comes from the speed of an average separated vehicle - using average vehicle length and the occupancy time from loop detectors. So some errors were occurred by the speed estimation method using average vehicle lengths. And Operators had been difficult to optimize some variables for measuring the traffic queue length estimation algorithm in COSMOS. Therefore the traffic queue length estimation algorithm on the basis of the relation between distances and occupancy rates from loop detectors was developed in this thesis. This thesis had the advantage of using occupancy rates which came out from loop detectors easily and no need to optimize some variables for the established algorithm in COSMOS. And the results of testing this algorithm in some sites which had installed COSMOS system showed better results than COSMOS system's results. But it was noted that further studies which carry it out in various sites and under various cases are necessary for applying to actual intersections.
Modeling and Analysis of Link Initialization Access of RE-DSRC
Lee Min-Heui ; Kwag Su-Jin ; Jung Jong-In ; Lee Sang-Sun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 23~31
ITS(Intelligent Transportation System) implementing information collection services and information support services for cars of moving fast needs a communication system of special aim such as RF-DSRC(Radio Frequency Dedicated Short Range Communication). Before RSE(Road Side Equipment) and OBE(On-Board Equipment) will be able to communicate RF-DSRC, OBE first have to request Link Initialization Access using ACTC(Activation Channel) in allocated ACTS(Activation Slot) by Slotted ALOHA. Even though Link Initialization Access is a important element to decide performance of communication system, optimal mathematic modeling study of Link Initialization Access which is adapted RF-DSRC characteristics is not enoush. So, in this paper, we propose mathematical modeling about Link Initialization Access of RF-DSRC. And then we computed Link Initialization Access probability defining offer load(G) which is adapted RF-DSRC characteristics for analyzing performance of modeling.
Review of Intelligent Transportation Systems Model Deployment Initiative
Nam Doohee ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 33~43
In autumn 2000, the Korea Ministry of Construction and Transportation (MOCT) announced that Daejeon metropolitan city, Jeonju and Jeju were chosen to showcase deployment of Intelligent Transportation Systems(ITS). The program called the Advanced Transportation Systems Model Deployment Initiatives makes a significant step in Intelligent Transportation Infrastructure (In) in Korea. The Initiative is poised to increase the performance and efficiency of the area's roadway and transportation systems to meet growth demand. Three citie's
50 million Model Deployment Initiative project is poised to increase the performance and efficiency of the area's roadway and transportation systems to meet growth demand. The effort particularly focused on the traveler information systems that should raise the level of ITS awareness in Korea. In this paper, project management, funding, private investment, procedures and detailed review of ITS Model Deployment Initiatives are discussed.
Evaluation of Intelligent Transportation Systems and Services Using the Sketch-Planning framework
Nam Doohee ; Lee Yong-Taek ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 45~52
Sketch-Planning based ITS Deployment Analysis System is an analysis tool for determining the impacts, benefits, and costs of various intelligent transportation system (ITS) deployments. This methodology offers one tool that systematically assesses ITS scenarios to facilitate the integration of such scenarios into the ongoing transportation planning process. Sketch-planting based methodology can estimate relative impacts, benefits, and costs for more than 60 types of ITS investments deployed in isolation or in any combination defined by the user.
Sensitivity Analysis of the Factors Affecting Traffic Micro-simulation Results
Kim Kyu-Ok ; Shin Chi-Hyun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 53~66
Microscopic simulation models, which focus on individual vehicles, are used extensively in the transportation operations in order to capture vehicle to vehicle and vehicle to traffic controls. There are many important factors involved when a micro simulation model is applied as an evaluation tool for the traffic system. They typically include test bed, software, simulation time period, measure of effectiveness, parameter for a software, OD matrix, and random seed number. To evaluate the effects of those factors, sensitivity analysis was performed to identify the effects of those factors based on CORSIM and TRANSIMS results. Three freeway corridors, two in Houston (I-10 and US 290) and one in Sin Antonio (I-37), were chosen as test beds. Three time periods (AM, PM, off-peak) and three OD matrix estimates were used for the analysis. It was found that the micro-simulation results were highly sensitive to the model Parameter sets and the OD information. The degree of sensitivity was a function of the test bed and time period.
Asymmetric Cascaded Coupled tine Couplers
Park Myun-Joo ; Lee Byungje ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 67~72
This work proposes a novel coupled line coupler structure based on the asymmetric cascaded connection of coupled lines. The proposed structure can be designed in smaller size than conventional single section coupled line couplers. Also, the additional design freedom offered by the proposed structure can serve many useful purposes such as the output phase control or the flexible coupler layout for complex circuit routing environments.
Comparison of Phase Noise Characteristics of Three Quadrature Voltage Controlled Oscillators
Moon Seong-Mo ; Cho Il-Hyun ; Lee Moon-Que ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 73~79
Various CMOS quadrature-voltage-controlled oscillators(QVCOS) are designed and fabricated for the comparison of the phase noise characteristic. The first one is that the QVCO is composed of two Colpitts oscillators cross-coupled with PMOS coupling transistors. The second and third ones are the conventional LC VCO and the balanced Colpitts VCO followed by the frequency-divide-by-two, respectively. The simulation result demonstrate that Colpitts schemes show better phase noise performance by 6 dB than that of a conventional stheme in which LC VCO is followed by the frequency-divide-by-two.
Design and Implementation of VCO for Doppler Radar System
Kim Yong-Hwan ; Kim Hyun-Jin ; Min Jun-Ki ; Yoo Hyung-Soo ; Lee Hyung-Kyu ; Hong Ui-Seok ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 4, issue 2, 2005, Pages 81~87
In this paper, a VCDRO(Voltage Control Dielectirc Resonator Oscillator) for signal source of doppler radar system is designed and fabricated. The proposed VCDRO is made with new tuning mechanism using CPW line. The coplanar waveguide of
/2 in length with varactor diode is placed on the metallization side under the dielectric resonator and coupled to it. Tuning varactor diode is mounted at one end of the CPW. The proposed circuit tuned by a CPW allows one more varactor diode to be mounted on the optimized CPW, where a greater sensitivity of frequency tuning is needed. With varying the biasing voltage for the varactor diode from 0 V to 15 V, output frequency tuning of 12 MHz is obtained. The PLDRO exhibits output power of 16.5 dBm with phase noise in the phase locked state characteristic of -115 dBc/Hz at 100 Hz, -105 dBc/Hz at the 10 kHz, and -102 dBc/Hz at 1 Hz offset from 10.525 GHz , respectively.