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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
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Journal DOI :
The Korea Institute of Inteligent Transport Systems
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Volume & Issues
Volume 11, Issue 6 - Dec 2012
Volume 11, Issue 5 - Oct 2012
Volume 11, Issue 4 - Aug 2012
Volume 11, Issue 3 - Jun 2012
Volume 11, Issue 2 - Apr 2012
Volume 11, Issue 1 - Feb 2012
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Study on Performance and Effectiveness Evaluation Method for Semi-Actuated Signal Control Systems based on Image Detectors
Lee, Chul-Ki ; Yun, Il-Soo ; Oh, Young-Tae ; Lee, Hwan-Pil ; Park, Dae-Hyun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 1~12
DOI : 10.12815/kits.2012.11.1.001
Even though the semi-actuated signal control system based on image detectors has been spreading in Korea, any appropriate methods to evaluate the effectiveness and performance has not been established yet. Therefore, this research effort is aiming at developing a systematic method for evaluating the effectiveness and performance of the semi-actuated signal control system based on image detectors. To this end, this research firstly established measures of effectiveness(MOEs) and associated information to be surveyed from fields. Secondly, this research provided a procedure and methodology to evaluate any improvements due to the introduction of a semi-actuated signal control system based on image detectors. The developed methodology was examined at a case study site located in the city of Paju. As a result of the evaluation, the MOEs including traffic throughput, travel speeds, split usage rate, progression rate, etc. showed positive improvements though individual signalized intersections as well as coordinated corridors.
An Estimation for VMS Message Reading Time Considering Traffic Condition and Human Factor
Hyun, Moon-Kook ; Kim, Seung-Ji ; Kim, Byoung-Jong ; Kim, Won-Kyu ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 13~27
DOI : 10.12815/kits.2012.11.1.013
According to the development of Intelligent Transportation System technology, VMS(Variable Message Signs) are operating on highway. But, VMS display information which don't reflect traffic condition and driver's human factor. So driver can't read VMS message during limited time, it makes to reduce VMS's reliability. This paper presents a model for VMS message reading time and distance considering traffic condition and human factor. We built driving simulator by Winroad package which is able to copy real driving condition. Subjects were comprised of 20 people who reflect domestic driver's condition such as sex. We did regression analysis with experiment results and draw the model. The model could be possible to develop message- set considering traffic condition and human factor.
User's Satisfaction Analysis on the User-Oriented Public Transit Service in Busan
Park, Han-Young ; Kim, Gyeong-Seok ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 28~41
DOI : 10.12815/kits.2012.11.1.028
The User-Oriented Public Transit Service provide public transit service through media devices, such as mobile, BIT and In-vehicle display devices, which considered user's individual characteristics and specific preference anytime and anywhere. The objective of this study is to develop and improve the services in the three media devices. This study applied user-satisfaction analysis in evaluating the service in Busan, analyze factor affecting the level of service user's satisfaction, and draw remedies based on the analysis results. The user's satisfaction average values in each media are 3.29 mobile, 3.62 BIT, and 4.05 In-vehicle display devices. Overall satisfaction average value 3.54 on the service showed a positive reaction from the survey participants. The important factor affected on general satisfaction of the User-Oriented Public Transit Service is "In-vehicle display devices" scored .632 (standardized coefficient) by categorical regression analysis. But users prefer to further improve the service environment rather than to add service information because they are already contented with the information they are getting. Furthermore, this study suggested ways of improving the User-Oriented Public Transit Service based on the satisfaction analysis results from the user's perspective.
Design of a Rectangular Waveguide Antenna for Automotive Side and Rear Radar Sensor Applications
Lee, Jae-Min ; Ryu, Hong-Kyun ; Woo, Jong-Myung ; Koo, Bon-Hee ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 42~52
DOI : 10.12815/kits.2012.11.1.042
In this paper, a waveguide antenna is designed and fabricated for side and rear radar sensor of vehicles in UWB (Ultra Wide Band) high band (center frequency : 9.5 GHz, -10 dB bandwidth : 600 MHz (6.4 %)). For the radar antenna, a probe fed rectangular waveguide antenna having simple structure and wide bandwidth is used. An important performance factor in this antenna is the isolation between transmitting (TX) and receiving (RX) waveguide antennas because this radar system uses TX and RX antennas separately. Thus the isolation between two antennas was simulated for E-plane and H-plane array. As a result, it was verified that the isolation of the H-plane array of the antennas is better than E-plane array, due to the TE10 mode. Therefore, H-plane arrayed waveguide antennas were mounted on a T-shaped radar module and performance of antennas was investigated. The -10 dB bandwidth of the TX and RX antenna mounted on T-shaped radar module was measured as 1000 MHz (10.52 %) and 1090 MHz (11.47 %) respectively and the isolation is less than -50 dB in the operation band. The peak gain is 7.65 dBi for the TX antenna and 7.26 dBi for the RX antenna and the beamwidth of H-plane of TX and RX antenna was measured as
respectively. Consequently, we verified that the proposed waveguide antenna is appropriate for a vehicle radar applications.
Performance Analysis of IEEE 802.15.4a System in UWB Intra Vehicle Communications Channel
Khuandaga, Gulmira ; Lee, Cheon-Hee ; Kim, Baek-Hyun ; Kwak, Kyung-Sup ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 53~65
DOI : 10.12815/kits.2012.11.1.053
Recently wireless intra-vehicle communication has received a great interest from the automotive industry and ultra wideband (UWB) technology is considered as one of the potential candidate for this system. Many research works have been done on the measurement and modeling of intra-vehicle communication channel. However, very little work has been reported for the performance analysis of various PHY layer methods under the intra-vehicle communication environment. This paper is to study IEEE 802.15.4a standard in intra-vehicle channel and to evaluate its performance. Channel model in chassis and engine compartment is considered for evaluation. Through simulation BER performance of system with different receiver structures is analyzed.
A Bandwidth Allocation Scheme using NBS in a Multiservice Networks
Park, Jae-Sung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 66~71
DOI : 10.12815/kits.2012.11.1.066
In this paper, using the bargaining game theory, we propose a bandwidth management scheme that allocates bandwidth in an efficient and proportionally fair manner between the service classes with different service requirements. Since the traffic input rates of the classes are asymmetric in most of the time, the proposed scheme allocates bandwidth in proportion to the traffic input rates to increase the bandwidth utilization while protecting the quality of service of a class against the excessive traffic input of the other classes. In addition, the proposed method considers the weights of classes so that the bandwidth is allocated differentially among the classes.
The Android-based Bluetooth Device Application Design and Implementation
Cho, Hyo-Sung ; Lee, Hyuk-Joon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 72~85
DOI : 10.12815/kits.2012.11.1.072
Today, although most bluetooth hands-free devices within a vehicle provide telephone service functions such as voice communication, caller id display and SMS message display and so on, they do not provide a function that displays Internet-based text data. We need to develop a scheme that displays the internet-based text data including existing hands-free function because the request for using the Internet service is increasing within a vehicle recently. The proposed bluetooth device application includes advanced function such as SNS message arrival notification, the message display function and we chose Android as the implementation mobile platform giving consideration to the fact that most SNS applications operate on Android and the platform is easily embedded into small embedded device. Smartphone or tablet PC connected with the proposed bluetooth device is an Android-based device and we designed a form of Android app for the function implementation of the devices. When the audio-text gateway app receives SNS text data, it extracts title and sender information from the message header information in a form of text data and sends them via ACL (Asynchronous Connection-Oriented) link to the bluetooth device showing the data on the screen. Android-based bluetooth devices are not possible to play voice through speaker because the bluetooth hands-free or headset profile ported within Android platform normally only includes audio gateway's function. The proposed bluetooth device application, therefore, applies the streaming scheme that sends data via ACL link instead of the way that sending them via SCO (Synchronous Connection-Oriented) link.
Performance Comparison of Noise Reduction Algorithms for Enhancing Voice Quality based on Telematics
Kim, Hyoung-Gook ; Choi, Hong-Jae ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 86~91
DOI : 10.12815/kits.2012.11.1.086
To provide high voice quality of real-time voice communication based on telematics exposed to various noise environments, the noise reduction algorithm with low computing load is required to effectively remove the noise. In this paper, we propose a noise reduction algorithm based on Mel-Filter and illustrate the proposed algorithm comparing with conventional noise reduction algorithms. As a experimental result that evaluates the performance of the noise reduction algorithms under the car and babble noise environments, the proposed noise reduction algorithm has the lower computing load with the similar PESQ score compared to the conventional noise reduction algorithms. It proves that the proposed noise reduction algorithm can efficiently remove the noise in mobile telematics.
A Data Gathering Scheme using Dynamic Branch of Mobile Sink in Wireless Sensor Networks
Lee, Kil-Hung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 92~97
DOI : 10.12815/kits.2012.11.1.092
This paper suggests a data gathering scheme using dynamic branch tree in wireless sensor networks. A mobile sink gathers data from each sensor node using a dynamic data gathering tree rooted at the mobile sink node. As the sink moves, a tree that has multiple branch is formed and changed dynamically as with the position of the sink node. A hop-based scope filter and a restricted flooding scheme of the tree are also suggested. Simulation results show that the proposed data gathering scheme has better results in data arrival rate, the end-to-end delay and energy saving characteristics compared with the previous scheme.
A New RFID Tag Identification Protocol Utilizing Collision Patterns
Park, Young-Jae ; Kim, Young-Beom ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 98~104
DOI : 10.12815/kits.2012.11.1.098
In RFID Systems, collisions between multiple tags frequently arise due to simultaneous responses from multiple tags using the same communication channel. Most of anti-collision protocols such as QT regard these collisions as useless cycles, thereby wasting the channel bandwidth. In this paper, we propose a new anti-collision protocol, namely ASP (Adjustable splitting by patterns of collisions) protocol that utilizes the patterns collision for noticeable performance enhancements.
A Study on the Estimation of Required Communication Capacity for Link-16 Based Tactical Networks
Kim, Young-Beom ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 1, 2012, Pages 105~111
DOI : 10.12815/kits.2012.11.1.105
In this paper, we investigate the most commonly adopted networking technology for Network Centric Warfar (NCW), namely Link-16 in the perspectives of physical, data link, and network layers (specifically, strategic message exchanges) and derive its merits with some constraints therein. Furthermore, we perform a quantitative evaluation on its communication capacity, focusing on whether Link-16 can indeed meet the capacity requirements for major operations, based on the time slot structure, NPG, and multi-netting concepts.