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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 13, Issue 6 - Dec 2014
Volume 13, Issue 5 - Oct 2014
Volume 13, Issue 4 - Aug 2014
Volume 13, Issue 3 - Jun 2014
Volume 13, Issue 2 - Apr 2014
Volume 13, Issue 1 - Feb 2014
Selecting the target year
Queue Length Based Real-Time Traffic Signal Control Methodology Using sectional Travel Time Information
Lee, Minhyoung ; Kim, Youngchan ; Jeong, Youngje ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 1~14
DOI : 10.12815/kits.2014.13.1.001
The expansion of the physical road in response to changes in social conditions and policy of the country has reached the limit. In order to alleviate congestion on the existing road to reconsider the effectiveness of this method should be asking. Currently, how to collect traffic information for management of the intersection is limited to point detection systems. Intelligent Transport Systems (ITS) was the traffic information collection system of point detection method such as through video and loop detector in the past. However, intelligent transportation systems of the next generation(C-ITS) has evolved rapidly in real time interval detection system of collecting various systems between the pedestrian, road, and car. Therefore, this study is designed to evaluate the development of an algorithm for queue length based real-time traffic signal control methodology. Four coordinates estimate on time-space diagram using the travel time each individual vehicle collected via the interval detector. Using the coordinate value estimated during the cycle for estimating the velocity of the shock wave the queue is created. Using the queue length is estimated, and determine the signal timing the total queue length is minimized at intersection. Therefore, in this study, it was confirmed that the calculation of the signal timing of the intersection queue is minimized.
Optimal Signal Times for Active Bus Signal Priority on Median Bus Lane Using Deterministic Delay Model
Kim, Tae-Woon ; Jeong, Young-Je ; Kim, Young-Chan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 15~25
DOI : 10.12815/kits.2014.13.1.015
Bus signal priority is a name for various techniques to speed up bus public transport services at intersections with traffic signals. In this study propose methodology to optimize signal times for Early green, Green extension out of the active bus signal priority using deterministic delay model in isolated intersection on median bus lane. Fluctuation is found in the vehicle delay and person delay in the event that using this methodology redistributed to green time and checking slack green time is correct value by sensitivity analysis. As a result of the study, car delay is increased a little and person delay is decreased. As a result of slack green time sensitivity, delay is not much in it if variation of slack green time under 30%. But this methodology effectiveness is under claimed capacity if variation of slack green time over 30%.
A Study on Developing Intersection Dilemma Zone Evaluation Model
Lee, Seung-Gyu ; Lee, Sibok ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 26~34
DOI : 10.12815/kits.2014.13.1.026
This study focuses on development of a risk level evaluation model for the intersection dilemma zone based on vehicle speed distribution approaching the intersection. The study results show that dilemma zone exists for all approaches selected for the study because the values of amber time have not been properly set, and that re-optimized values significantly reduce the dilemma zone risk level. It is also found that when normal distribution is assumed for vehicle approach speed the risk values similar to those for actual speed distributions can be obtained. When the risk level is found to be high, the amber time must be adjusted to reduce the length of the dilemma zone, or speed calming measures must be introduced so that vehicle speed be maintained under the speed value used when determining the amber time.
Performance and Multi-hop Transmission Tests for Vehicular Communication Systems in Real Road Environments
Song, Jung-Hoon ; Lee, Jae-Jeong ; Jung, Seung-Wan ; Seo, Dae-Wha ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 35~45
DOI : 10.12815/kits.2014.13.1.035
The driving environment of the vehicle has characteristics that the change of position, velocity and distance between vehicles is severe. The performance test of system must be carried out in the real road environments with consideration of the driving environment of vehicles to measure the performance correctly because the performance of vehicular communication systems is affected by the driving conditions of the vehicle. In this paper, we propose the test methods of V2V/V2I performance and V2V multi-hop transmission function and present the test results measured by the vehicular communication systems already developed. In the test result, we confirmed the fact that the distance of communication devices and the driving direction of vehicle are affecting the communication performance. We also confirmed the multi-hop transmission function using the driving vehicle in the limited area as the proposed test method.
Design of Multi-Meander Microstrip Patch Antenna for Metallic Object in u-City
Choi, Yong-Seok ; Seong, Hyeon-Kyeong ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 46~52
DOI : 10.12815/kits.2014.13.1.046
In this paper, we present a design of meander type microstrip patch antenna which has the best quality in RFID approved international standard of 910MHz broadband, usable in metal environment. In order to be fit into the commercial tag chip on the antenna, a square shaped feeder is installed on the main body as well as in the main body. In addition, a multi meander type patching element was designed in order to reduce the main body effectively. Three antennae, Cases 1, 2 and 3, were designed and compared in the areas of broad band width, effectiveness or recognition distance according to their sizes and number of folds. The measurement result of Case 3 was determined to be the best. It was confirmed that mostly the efficiency and characteristic gain change due to antenna size and number of folds in meander type influenced the antenna recognition distance.
Vehicle Mobility Management Scheme Using AdaBoost Algorithm
Han, Sang-Hyuck ; Lee, Hyukjoon ; Choi, Yong-Hoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 53~60
DOI : 10.12815/kits.2014.13.1.053
Redundant handovers cause degraded quality of service to passengers in vehicle. This paper proposes a handover scheme suitable for users traveling in vehicles, which enables continuous learning of the handover process using a discrete-time Markov chain (DTMC). Through AdaBoost machine learning algorithm, the proposed handover scheme avoids unnecessary handover trials when a short dwell time in a target cell is expected or when the target cell is an intermediate cell through which the vehicle quickly passes. Simulation results show that the proposed scheme reduces the number of handover occurrences and maintains adequate throughput.
An internal multi-band antenna for mobile handset using two slots
Ahn, Sang-Kwon ; Choi, Sunho ; Kwak, Kyung-Sup ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 61~66
DOI : 10.12815/kits.2014.13.1.061
This paper describes the design, fabrication, and measurement of a compact hexa-band coupling antenna for 4G mobile handset using a small element with two slots. In order to obtain sufficient bandwidth (LTE700, GSM850, GSM900, GSM1800, GSM1900, UMTS) with a Voltage Standing Wave Ratio
, two slots are inserted in the small element, and coupling patch is used. The measured result of the fabricated antenna provides 410MHz bandwidth form 0.688 to 1.098GHz and 643 MHz bandwidth form 1.607 to 2.250GHz (
) with the gain ranging from -0.52 to 4.68 dBi. Also, a good radiation pattern is achieved within the hexa-band (0.698-0.960GHz and 1.710-2.170GHz) range.
Design of Compact Microstrip Patch Antenna for Short Distance WLAN
Choi, Yong-Seok ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 67~74
DOI : 10.12815/kits.2014.13.1.067
In this paper, we designed a multiband monopole antenna for next-generation WLAN system. In conventional WLAN system, UWB antennas were used together, and, because the radiation occurs in different parts depending on the antenna structure, it has the disadvantage of having an unstable impulse response characteristic due to dispersion characteristics. Although a UWB antenna that has suitable radiation pattern for WLAN band, it does not have good impedance matching and has severe echo. Therefore, in this paper, a monopole antenna was designed by using CPW power feed so that various impedances can be easily implemented when designing an antenna and more parameters can be derived that can be used for design for optimal performance.
Development of the Multi-mobility Sharing Service Management System - A Case Study of Kashiwa City, Japan -
Kim, Jae-Youl ; Tsubouchi, Kota ; Yamato, Hiroyuki ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 75~85
DOI : 10.12815/kits.2014.13.1.075
Existing car-sharing systems have difficulty meeting the demands of one-way trips and connecting to other sharing systems. Therefore, in this study, a multi-mobility sharing service management system that was able to meet the demands of the one-way and round-way trips and shared diverse transportation modes such as cars (electric car/gasoline car), electric motorcycles and bicycles was developed, and a field study was conducted in Kashiwa-no-ha, Kashiwa City and Nagareyama City, Chiba Prefecture, Japan. As a result of the field test, it was confirmed that this system supplied the one-way demands for 54.9% of total car trips and 43.9% of the user used multiple transportation modes by the common interface. In addition, this system contributed to reduce carbon dioxide emissions by sharing vehicles and using eco-friendly vehicles. The developed sharing system is expected to improve mobility by meeting more various types of traffic demand than existing car sharing systems.
A study of method that "One Card All Pass" applies ETCS (Electronic Toll Collection System)
Oh, Se-Wan ; Kim, Kyoung-Hwa ; Cho, Yong-Sung ; Lee, Heung-Pyo ; Jung, Sung-Hwa ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 86~98
DOI : 10.12815/kits.2014.13.1.086
Currently, many OBUs(On Board Unit)s were installed on the vehicle because ETCS(Electronic Toll Collection System) using DSRC(Dedicated Short Range Communication) was constructed in the tollgate of the whole country.A research development and the commercialization utilizing the One Card All Pass and those Infrastructures of ETCS, are promoting of ITS services. Although many studies of the application method about the One Card All Pass of ETCS have been made, standards about the application method of the One Card All Pass and payment for the provision of traffic convenience, were not made clear. So we are proposed method that One Card All Pass announced by Ministry of Land, Infrastructure and Transport, takes advantage of the existing DSRC-based to apply ETCS. We have confirmed the performance of the system through a variety of driving test using three test vehicles on trial operation site and ETCS applying application method proposed in this study. As a result of driving test, we have confirmed validity of standard application method proposed in this study through the communication success rate of about 99% and analyzed problem that may occur by applying service parts of ETCS of transportation convenience facilities because of about 1% communication failure rate.
Development of Dead Reckoning Algorithm Considering Wheel Slip Ratio for Autonomous Vehicle
Kwon, Jaejoon ; Yoo, Wongeun ; Lee, Hoonhee ; Shin, Dong Ryoung ; Park, Kyungtaek ; Park, Kihong ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 99~108
DOI : 10.12815/kits.2014.13.1.099
Recently, the interest in autonomous vehicle which is an aggregate of the automotive control technology is increasing. In particular, researches on the self-localization technology that is directly connected with stable driving of autonomous vehicle have been performed. Various dead reckoning technologies which are solutions for resolving the limitation of GPS have been introduced. However, the conventional dead reckoning technologies have two disadvantages to apply on the autonomous vehicle. First one is that the expensive sensors must be equipped additionally. The other one is that the accuracy of self-localization decreases caused by wheel slip when the vehicle's motion changed rapidly. Based on this background, in this paper, the wheel speed sensor which is equipped on most of vehicles was used and the dead reckoning algorithm considering wheel slip ratio was developed for autonomous vehicle. Finally, in order to evaluate the performance of developed algorithm, the various simulation were conducted and the results were compared with the conventional algorithm.
Feasibility Evaluation of Lane Grouping Methods for Signalized Intersection Performance Index Analysis in KHCM
Kim, Sang-Gu ; Yun, Ilsoo ; Oh, Young-Tae ; Ahn, Hyun-Kyung ; Kwon, Ken-An ; Hong, Doo-Pyo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 109~126
DOI : 10.12815/kits.2014.13.1.109
The level of service (LOS) of the Highway Capacity Manual (KHCM) has been used as a basic criterion at decision making processes for signalized intersections in Korea. The KHCM provides five steps for the signalized intersection analysis. Among them, lane grouping, which is the third step, significantly influence the final LOS. The current method presented in the KHCM, however, classifies a shared lane as a de facto turning lane group, even though the turning traffic of the shared lane is few. Thus, this research was initiated to provide an alternative. To this end, three alternatives were suggested, including the method based on the lane grouping presented in the U.S. Highway Capacity Manual, the method using turning ratio of shared turning lane, and the method using a threshold traffic volume in lane grouping. The feasibilities of the three methods were evaluated using a calibrated CORSIM model. Conclusively, the method using a threshold traffic volume in lane grouping outperformed.
On the implementation of Taper slot array antenna structure
Lee, Cheon-Hee ; Kim, Ho-Jun ; Kwak, Kyung-Sup ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 13, issue 1, 2014, Pages 127~134
DOI : 10.12815/kits.2014.13.1.127
X-Band taper slot-typed active phased array antenna is studied and designed. Through the simulated and measured performances, it is confirmed that both of active reflection coefficient and active radiation pattern of the designed phased array antenna are agreed well with those of the prototype manufactured one. From this study, the proposed antenna structure is matched to the design target of characteristics of antenna's broadband beam.