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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
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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
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Integrated Traffic Management Strategy on Expressways Using Mainline Metering and Ramp Metering
Jeong, Youngje ; Kim, Youngchan ; Lee, Seungjun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 2, 2013, Pages 1~11
DOI : 10.12815/kits.2013.12.2.001
This research proposed integrated expressway traffic management strategy using ramp metering and toll mainline metering. This research suggested a traffic signal optimization model for integrated operation of ramp and mainline metering based on Demand-Capacity Model that is used to optimize allowable input volume for ramp metering in FREQ model. The objective function of this model is sectional throughput volume maximization, and this model can calculate optimal signal timings for mainline metering and ramp metering. This study conducted an effectiveness analysis of integrated metering strategy using PARAMICS and its API. It targeted Seoul's Outer Ring Expressway between Gimpo and Siheung toll gate. As a simulation result, integrated operation of mainline and ramp metering provided more smooth traffic flow, and throughput volume of mainline increased to 14% in congested section. In addition, a queue of 400 meter was formed at metering point of toll gate. This research checked that integrated traffic management strategy facilitates more efficient traffic operation of mainline and ramp from diffused traffic congestion.
Development of Shortest Path Searching Network Reduction Algorithm
Ryu, Yeong-Geun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 2, 2013, Pages 12~21
DOI : 10.12815/kits.2013.12.2.012
This study developed searching network reduction algorithm for reduce shortest path searching time. Developed algorithm is searching nodes that have the including possibility of less weights path than temporal path that consists minimum number of nodes and minimum sum of the straight line distances. The node that has the including possibility of shortest path is the node that the sum of straight line distance from start node and straight line distance to target node is less than the value that temporary path's weights divided by minimum weights units. If searching network reconstitutes only these nodes, the time of shortest path searching will be reduced. This developed algorithm has much effectiveness that start node and target node is close in large network.
Feasibility analysis of RPSD(Rope type Platform Safe Door) on the simulation
Kang, Hee-Chan ; Kim, Hyun ; Chung, Younshik ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 2, 2013, Pages 22~29
DOI : 10.12815/kits.2013.12.2.022
The platform safety door is difficult to install in platform because the doors of railway vehicles and existing Passenger Safety doors should be alined. To be able to solve this problem, we propose the use of Rope Type Platform Safe Door (RPSD) which is a vertically retractable platform that is designed to close from top to bottom. This platform has installed safety gate pillars at intervals of 20-40 m which accommodates different types of train regardless of train length, gate opening and location. In this paper, we reviewed the application of existing PSD and RPSD in various train stops in Seoul Gyeongbu Line platform. The results of the review showed that the existing PSD may cause problem in construction, safety and cost efficiency. The use of RPSD however shows that minimal problems will be encountered.
Extended Loop Antenna for the Mobile Handset
Son, Taeho ; Ryu, Hwang ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 2, 2013, Pages 30~37
DOI : 10.12815/kits.2013.12.2.030
An extended loop antenna, to be continued BLA(Branch Loop Antenna) in the previous volume, for the mobile handset is designed in this paper. It's introduced an ELA(Extended Loop Antenna) that is added extended loops to rectangular loop, and verified antenna performances for applying to mobile handset. Extended loops are located upside, left and right side of rectangular loop, and low resonance is obtained by the length of line. Multiple resonances are established by the extended loops, and obtained the desired service bands by the connection points and lengths. By the implementation and measurement for the multiband ELA, it's showed -3.0~-1.46dBi average gains with 50.15~71.41% efficiencies at CDMA/GSM frequency band, and -8.28~-1.7dBi average gains with 14.87~67.68% efficiencies at DCS/USPCS/WCDMA frequency band.
Design and Implementation of a Mobile Terminal Device for Video Transmission in Multiple Networks
Kim, Jong-Heon ; Lee, Dong-Soo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 2, 2013, Pages 38~44
DOI : 10.12815/kits.2013.12.2.038
In this paper, we designed and implemented a mobile video transmission device with 1080i resolution and 30fps frame rate using wireless multi-access technologies. The video acquisition delay time of 16us and jitter of 21ms for this equipment were obtained, respectively. The device is designed to access various communication networks. In order to evaluate the performance of its video transmission capability, a server and monitoring viewer are implemented. In the performance test using LTE network, 211ms delay time was obtained at 3Mbps transmission. Rendering of 1fps frame rate at the 265kbps transmission was confirmed for the transmission test using Inmarsat network.
A pressure sensor system for detecting driver's drowsiness based on the respiration Paper Template for the KITS Review
Kim, Jaewoo ; Park, Jaehee ; Lee, Jaecheon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 2, 2013, Pages 45~51
DOI : 10.12815/kits.2013.12.2.045
In this paper, a driver's drowsy detection sensor system based on the respiration is investigated. The sensor system consists of a piezoelectric pressure sensor attached at the abdominal region of the seat belt and a personal computer. The piezoelectric pressure sensor was utilized for the measurement of pressure variations induced by the movement of the driver abdomen during breathing. The signal processing software for detecting driver's drowsiness was produced using the Labview. The experiments were performed with 30 years male driver. The amplitude of the respiration at awake state was larger than one at the drowsy state. On the contrary, the respiration rate at awake state was lower than one at the drowsy state. The drowsy detection sensor system developed based on the experimental could successfully detect the driver's drowsy on real-time.
A Study on Characteristic Design Hourly Factor by Road Type for National Highways
Ha, Jung-Ah ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 2, 2013, Pages 52~62
DOI : 10.12815/kits.2013.12.2.052
Design Hourly Factor(DHF) is defined as the ratio of design hourly volume(DHV) to Average Annual Daily Traffic(AADT). Generally DHV used the 30th rank hourly volume. But this case DHV is affected by holiday volumes so the road is at risk for overdesigning. Computing K factor is available for counting 8,760 hour traffic volume, but it is impossible except permanent traffic counts. This study applied three method to make DHF, using 30th rank hourly volume to make DHF(method 1), using peak hour volume to make DHF(method 2). Another way to make DHF, rank hourly volumes ordered descending connect a curve smoothly to find the point which changes drastic(method 3). That point is design hour, thus design hourly factor is able to be computed. In addition road classified 3 type for national highway using factor analysis and cluster analysis, so we can analyze the characteristic of DHF by road type. DHF which was used method 1 is the largest at any other method. There is no difference in DHF by road type at method 2. This result shows for this reason because peak hour is hard to describe the characteristic of hourly volume change. DHF which was used method 3 is similar to HCM except recreation road but 118th rank hourly volume is appropriate.
An Effectiveness Analysis of pedestrian crosswalk signal on roundabout
Moon, Joo-Baek ; Lee, In-Kyu ; Kim, Young-Chan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 2, 2013, Pages 63~75
DOI : 10.12815/kits.2013.12.2.063
Roundabouts have been operated in Europe, America and Australia since the 1970s, and many relevant researches continually was carried out. Though many studies regarding roundabout have been recently conducted in korea, most of them have focused on its operational safety and efficiency. Moreover, roundabout design guideline did not define a clear criteria related to pedestrian in roundabout, but seldom investigate the influences of pedestrian on crosswalk. In this study, we seek ways to operate the pedestrian crosswalk signal on roundabout maximizing their operational effects in exceptional case such as rush hour or intersection near the special facilities. We proved that roundabout signal operation is effective under certain circumstances in according to the number of pedestrian, and suggested the optimal signal timing plan for signalized roundabouts. For pursuing the above, we conducted the simulation test using the VISSIM model. The results show that the operational effectiveness of signalized roundabout was evaluated to be better than non-signalized roundabout in specific pedestrian volume condition. In addition, those results are confirmed using simulation analysis conducted on the real roundabout.