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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 8, Issue 6 - Dec 2009
Volume 8, Issue 5 - Oct 2009
Volume 8, Issue 4 - Aug 2009
Volume 8, Issue 3 - Jun 2009
Volume 8, Issue 2 - Apr 2009
Volume 8, Issue 1 - Feb 2009
Selecting the target year
A Development of Evaluation Index for Bus Demand-Elastic Schedule Management
Lee, Ho-Sang ; Chang, Hyun-Ho ; Kim, Young-Chan ; Hwang, Kyong-Soo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 1~13
Although enormous data have been collected in major cities (Korea) by APTS(Advanced Public Transit Systems), most of studies related to bus schedule management evaluation have confined to headway adherence and on-time performance. Therefore, bus operation management have been very lack of using APTS data. This study uses coefficient of correlation to evaluate bus company's schedule management level. However, direct application of coefficient of correlation has inequitable problem because of many limitation(number of vehicle, headway, etc). and so variable calibration method was developed and applied to cope with these problems. Thus, demand-elastic management evaluation index was developed. For verifying the equity of developed index, it is applied to Seoul bus routes. It is expected for the developed index to contribute into the demand-elastic management of bus schedule.
Estimation of Predictive Travel Times Using Ubiquitous Traffic Environment under Incident Conditions
Park, Joon-Hyeong ; Hong, Seung-Pyo ; Oh, Cheol ; Kim, Tae-Hyeong ; Kim, Won-Kyu ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 14~26
This study presented a novel method to estimate travel times under incident conditions. Predictive travel time information was defined and evaluated with the proposed method. The proposed method utilized individual vehicle speeds obtained from global positioning systems (GPS) and inter-vehicle communications(IVC) for more reliable real-time travel times. Individual vehicle trajectory data were extracted from microscopic traffic simulations using AIMSUN. Market penetration rates (MPR) and IVC ranges were explored with the accuracy of travel times. Relationship among travel time accuracy, IVC ranges, and MPR were further identified using regression analyses. The outcomes of this study would be useful to derive functional requirements associated with traffic information systems under forthcoming ubiquitous transportation environment
Comparative Analysis on the Effectiveness of Modern Roundabouts and 4-legged Signalized Intersections
Park, Byung-Ho ; Kim, Tae-Young ; Han, Sang-Wook ; Yang, Jeong-Mo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 27~35
The roundabout was developed in the United Kingdom to rectify problems associated with these traffic circles. In 1966, the United Kingdom adopted a mandatory "give-way" rule at alt circular intersections, which required entering traffic to give way, or yield, to circulating traffic. However, the roundabout used in United States or Europe do not common use in Korea. The purposes of the study is to comparatively analyze the effectiveness of roundabout. In pursuing the above, this study designs the scenarios which can reflect the directional traffic volumes, and analyzes the average control delay of roundabout and 4-leg signalized intersection by SIDRA. The main study results are as follows. First, when the entering traffic volume are less than 2,000pcph, the single-lane roundabout is analyzed to be more effective than 4-leg signalized intersection. Second, when the entering traffic volume are less than 3,200pcph, the double-lane roundabout is evaluated to be more effective than 4-leg signalized intersection. Third, which is installed left and right turn lane at intersection, area for the roundabout is analyzed to be less than that for general intersection area.
Lane Violation Detection System Using Feature Tracking
Lee, Hee-Sin ; Lee, Joon-Whoan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 36~44
In this paper, we suggest a system of detecting a vehicle with lane violation, which can detect the vehicle with lane violation, by using the feature point tracking. The whole algorithm in the suggested system of detecting a vehicle with lane violation is composed of three stages such as feature extraction, register and tracking in feature for the tracking-targeted vehicle, and detecting a vehicle with lane violation. In the stage of feature extraction, the feature is extracted from the inputted image by sing the feature-extraction algorithm available for the real-time processing. The extracted features are again selected the racking-targeted feature. The registered feature is tracked by using NCC(normalized cross correlation). Finally, whether or not lane violation is finally detected by using information on the tracked features. As a result of experimenting the suggested system by using the acquired image in the section with a ban on intervention, the excellent performance was shown with 99.09% for positive recognition ratio and 0.9% for error ratio. The fast processing speed could be obtained in 34.48 frames per second available for real-time processing.
A Study on Local Standard Complement Between the LED Signal Head and Traffic Controller for Improving Signal Safety
Le, Choul-Ki ; Lee, Jeong-Jun ; Oh, Bong-Sik ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 45~52
The off-state impedance of LED signal head is greater than that of a traditional bulb signal head, and the traffic controller has inherent off-state output leakage current. These two characteristics make the field trouble and reduce signal safety when the LED signal head is installed with traffic controller. In this Paper, a complement method of the LED signal head and traffic controller local standard (220vac line voltage) for improving signal safety is suggested. The point of designed complement method is to reduce the output leakage current of the traffic controller under 3mA, to increase the voltage feedback threshold to
, and to make LED signal head maintain off-state in 0-95vac with 10Kohm maximum impedance.
Dynamic Dilemma Warning System of WISDOM Based on DSRC
Jung, Sung-Dae ; Park, Soon-Yong ; Lee, Sang-Sun ; Kim, Jong-Bok ; Moon, Young-Jun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 53~59
Integrating a field of transportation and IT is becoming a novel solution to social and economic problems which was previously focused on the investment in infrastructures. It also created new areas of industry such as ITS and telematics. Especially, vehicle communication is being considered very important and DSRC is also important in the field of rational ITS in recent. DSRC OBE has come into wide use through ETCS. In the field of traffic signal control, the research to implement an optimal traffic signal control system using a real-time information of good quality is being carried out and also the study of WISDOM was successfully completed. This paper shows the development of Dynamic-Dilemma zone warning service utilizing WISDOM and the evaluation of a reliability and a practicality through the field test. While the proposed Dynamic-Dilemma warning system transmits an information of signal time optimized by WISDOM, the OBE which receives this information makes dilemma zone based on its location and speed and gives warning to a driver.
Real Time Macroscopic Traffic Flow Monitoring Using Acceleration Noise
Eom, Ki-Jong ; Lee, Chung-Won ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 60~66
The acceleration noise is valuable index to monitor traffic stability. However, the previous study was performed for the acceleration noise of individual vehicle. The consideration of the acceleration noise for vehicle in the network has not been studied yet. This paper proposes a new macroscopic traffic flow monitoring method based on applying network acceleration noise.
Design of a Multi-Band Antenna with CPWG Feed Line for the Telematics Mobile Device
Jee, Bong-Soo ; Jeong, Gye-Taek ; Kim, Woo-Soo ; Lee, Haw-Choon ; Kwak, Kyung-Sup ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 67~74
In this paper, the multi-band antenna with CPWG(Coplanar Waveguide with Ground) feed for telematics mobile devices is designed and fabricated. The proposed antenna improves the return loss characteristic by using open-circuited stub matching and rectangular slot in the radiation patch. In addition, CPWG structure makes up for the drawback of the CPW which is variation of impedance matching according to the gap variation of the feed line and the ground. The fabricated antenna has 1.4GHz (
, 65%) band width on -10dB (VSWR<2) and the maximum gains are 0.8dBi, 1.34dBi, 2.41dBi, 2.53dBi, 2.6dBi and 1.51dBi on each resonant frequency that are GPS
. It also has an omni-directional radiation pattern of H-Plane.
A Study on Improvement of Linearity and Efficiency Compensation in a Doherty Power Amplifier
Jang, Jeong-Seok ; Do, Ji-Hoon ; Yun, Ho-Seok ; Kim, Dae-Hee ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 75~82
This paper proposes a method which increases the linearity using an improvement mechanism of Doherty power amplifier and compensates the decrement of efficiency due to improvement of linearity. To verify the method, a 20W power amplifier is designed and implemented. Compared with 2-way Doherty power amplifier, the implemented 3-way Doherty power amplifier with class F shows improved linearity about 10dBc and efficiency about 1.5%. Also, efficiency characteristic has been improved about 3.5% compared with the 2-way Doherty power amplifier while maintaining linearity. This results show that the proposed 3-way Doherty power amplifier with class F is shown to be adequate for improvement of efficiency and linearity. It is expected that the proposed amplifier can be used for various wireless communication system amplifiers.
Performance of VLC-CDMA Communication System Using LED
Bae, Su-Jin ; Hong, Yeong-Jo ; Lee, Kye-San ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 83~90
White LEDs(Light Emitting Diode) offer advantageous properties such as high brightness, improved reliability, lower power consumption, and long lifetimes. An LED is an electronic device that converts an electrical signal into a tight signal and is used not only in Optical Communication Indoor wireless optical illuminating rooms, but also for wireless optical communication systems. Currently, studies about these white LEDs have been being progressed, and in this raper, we discuss the multiplex and the multiple access method of VLC(Visible Light Communication) systems using white LEDs. In proposed system, CDMA(Code Division Multiple Access) apples to VLC system to reduce interference of VLC system, and improve capacity. The superiority of OOK modulation is presented in analysis of results by comparing VLC-CDMA communication system using OOK(On-off keying) modulation and BPSK modulation in AWGN(Additive White Gaussian Noise) channel and Diffuse channel. And we investigate the significance of a solution of interference by multipath by comparing BER in multipath channel and AWGN channel. In the proposed system, we assume Directed LOS(Line Of Sight) and Diffuse Link, and suppose VLC-CDMA using OOC(Optical Orthogonal Code) as methods to increase efficiency of system by removing ISI(Inter Symbol Interference) caused by multiple access, optical spreading code, and also present an analysis of its performance.
Cross-Layer Handover Scheme Using Linear Regression Analysis in Mobile WiMAX Networks
Choi, Yong-Hoon ; Yun, Seok-Yeul ; Chung, Young-Uk ; Kim, Beom-Joon ; Lee, Jung-Ryun ; Lee, Hyun-Joon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 91~99
Mobile WiMAX is an emerging technology that can provide ubiquitous Internet access. To provide seamless service in mobile WiMAX environment, delay or disruption in dealing with mobility must be minimized. However offering seamless services on IEEE 802.16e networks is very hard due to long handover latency both in layer 2 and 3. In this paper, we propose a fast cross-layer handover scheme based on prediction algorithm. With the help of the prediction, layer-3 handover activities are able to occur prior to layer-2 handover, and therefore, total handover latency can be reduced. The experiments conducted with system parameters and propagation model defined by WiMAX Forum demonstrate that the proposed method predicts the future signal level accurately and reduces the total handover latency.
A Modified Velocity Estimation Scheme in AAS (Adaptive Antenna System)
Chung, Young-Uk ; Choi, Yong-Hoon ; Lee, Hyuk-Joon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 100~107
Velocity estimation is one of important issues for efficient system management in mobile cellular systems. In this paper, a modified velocity estimation scheme which works in Adaptive Antenna System (AAS) is proposed. The proposed scheme estimates user velocity based on moving distance information and sojourn time information. From numerical results, it is shown that the proposed scheme can estimate user velocity accurately with low cost.
Development of Bicycle Level of Service Model from the User's Perspective Using Ordered Probit Model
Lee, Gyeo-Ra ; Rho, Jong-Ki ; Kang, Kyung-Woo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 108~117
The South Korean government is looking for a solution to the ever-growing problems of traffic congestion, and surging international oil prices: the use of the humble bicycle to get to places. However, Many people feel inconvenient using bicycle because of the insufficient bicycle infrastructure and lack of the safety and connectivity between existing pathways. In this study, bicycle level of service model using ordered probit model is developed considering safety, convenience, connectivity, and factors that affect bicycle LOS. The ordered probit model would be recommended for the research which relates in choice, preference and strength etc. Bicycle level of service criteria is calculated by applying this model reflecting bicyclist's point of view. The model which develops from this research which accomplishes a bicycle level of service evaluation and represent alternative solution to encourage bicyclist. It is believed that the proposed model would be greatly utilized in bicycle network planning, bicycle road and facility alternatives testing, projects funding priority.
The Development of Traffic Accident Severity Evaluation Models for Elderly Drivers
Kim, Tae-Ho ; Lee, Ki-Young ; Choi, Yoon-Hwan ; Park, Je-Jin ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 118~127
This study tries to develop model in order to assess personal factors of senior traffic accidents that are widely recognized as one of the social problems. For the current practice. it gathers data (Simulation & Questionnaire Survey) of KOTSA and conducts Poisson and Negative Binomial Regression Analysis to develop traffic accident severity model. The results show that elderly drivers' accidents are mainly affected by attentiveness selection, velocity prediction ability and attentiveness distribution ability in a positive(+) way. Second, non-senior drivers' accidents are also positively(+) influenced by attentiveness selection, velocity prediction, distance perception, attentiveness distribution ability and attentiveness diversion ability. Therefore, influencing factors of senior and non-senior drivers to vehicle accidents are different. This eventually poses a indication that preliminary education for car accident prevention should be implemented based up[n the distinction between senior drivers and non-senior drivers.
A Study on Advancement of Proper Highway-Network Index for the Urban-Rural Consolidated City
Lee, Kyu-Suk ; Oh, Young-Tae ; Lee, Choul-Ki ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 128~136
As results of previous researches and literatures, it is known that the application of the highway-supply index including generally utilized coefficient is not adequate due to the considerable difference of its characteristics. Therefore, in this study, the efficient methodology for determination of optimal highway-supply index in urban-rural consolidated city is extensively suggested and evaluated.
Design and Implementation of a Telematics Service Framework for Open Services in the Heterogeneous Network Environment
Lee, Deuk-Woo ; Kang, Hong-Koo ; Han, Ki-Joon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 137~148
Recently, as technology for obtaining locational awareness and wireless telecommunications improve, technologies and services involving Telematics has grown rapidly. However, the services are currently available on certain terminals selected by the telematics service provider (TSP). This means in order to access services provided by other TSPs, it is necessary to purchase related terminals. To solve this problem, it is essential to achieve service interoperability between TSPs, or between TSPs and the contents provider (CP). Under this backdrop, the aim of this paper is to design and implement a telematics service framework for openning services in a heterogeneous network environment. Futhermore, the paper presents open telematics protocols required for communication in the telematics service framework, and develop technologies to deal with this in different network environments.
A Study of Location Correction Algorithm for Pedestrian Location Tracking in Traffic Connective Transferring System
Jung, Jong-In ; Lee, Sang-Sun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 2, 2009, Pages 149~157
Tracking technologies which provide real-time and customized information through various information collecting and processing for pedestrians who use traffic connective and transferring center have been being examined. However some problems are caused due to the wide-range positioning error for some services as device installation and service place. It is also difficult to be applied to traffic linkage and transfer services because many situations can be barren. In the testbed, Gwangmyoung Station, we got some results in bad conditions such as a lot of steel construction and another communication device. Practically, conditions of the place which will be built can be worse than Gwangmyoung station. Therefore, we researched suitable Location correction algorithm as a method for accuracy to traffic connective and transferring system. And its algorithm is designed through grid coordinates, map-matching, modeling coordinates and Kalman filtering and is being implemented continuously. Also preparing for optimization of various transferring center model, we designed for simulator type algorithm what is available for deciding algorithm factor.