Go to the main menu
Skip to content
Go to bottom
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 5, Issue 3 - Dec 2006
Volume 5, Issue 2 - Aug 2006
Volume 5, Issue 1 - Apr 2006
Selecting the target year
Dynamic O-D Trip estimation Using Real-time Traffic Data in congestion
Kim Yong-Hoon ; Lee Seung-Jae ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 5, issue 1, 2006, Pages 1~12
In order to estimate a dynamic origin and destination demand between on and off-ramps in the freeways, a traffic flow theory can be used to calculate a link distribution proportion of traffics moving between them. We have developed a dynamic traffic estimation model based on the three-phase traffic theory (Kerner, 2004), which explains the complexity of traffic phenomena based on phase transitions among free-flow, synchronized flow and moving jam phases, and on their complex nonlinear spatiotemporal features. The developed model explains and estimates traffic congestion in terms of speed breakdown, phase transition and queue propagation. We have estimated the link, on and off-ramp volumes at every time interval by using traffic data collected from vehicle detection systems in Korea freeway sections. The analyzed results show that the developed model describes traffic flows adequately.
Design and fabrication on 7-11 GHz, Broadband MPM
Choi Gil-Woong ; Lee Yu-Ri ; Kim Ki-Ho ; Choi Jin-Joo ; So Joon-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 5, issue 1, 2006, Pages 13~19
In this paper, a broadband Microwave Power Module(MPM) operating at 7 - 11 GHz is designed and fabricated. The MPM consists of a SSA (Solid State Amplifier) and a conventional TWT (traveling Wave Tube). This combined module takes advantage of a low noise and high gain of SSA. The computer modeling and simulation of the SSA are designed by the use of the ADS (Advanced Design System) software. The SSA is designed by configurating the CSSDA (Cascaded Single Stage Distributed Amplifier). The broadband MPM is measured to be noise figure 8.3 - 10.02 dB at 7 - 11 GHz bandwidth, output power of 38.12 dBm at 9 GHz.
Development of Traffic Signal Operation Strategies On Median Bus Lane
Kim Gyun-Jo ; Kim Young-Chan ; Kim Jin-Tae ; Jung Kwang-Bok ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 5, issue 1, 2006, Pages 21~30
For urban highway network, traffic control strategy paradigm has been shifted from the private auto-oriented to the public transit-oriented. Introduction of exclusive median bus lanes (EMBL) in Seoul, Korea, has especially accelerated such changes in transportation policy and thus highway environment. Left-turning movement treatment at signalized intersections where EMBL pass through has been emerged as one of the rising problems associated with a current signal head with 4-signal lens, the Korea standard. This study proposes a new signal phase operation scheme for signal operation at an isolated intersection where EMBL pass through. The authors propose to use of an exclusive bus signal head indicating right-of-way of transits on EMBL only. Based on it, three different phase operation scheme were developed for left-turn treatments for traffic control with (1) traffic responsive control mode and (2) time-of-day traffic control mode. In addition, methodologies to design and develop signal maps for the proposed signal phase schemes are also developed. The proposed operation can only be possible when additional uses of signal state relay boards are allowed.
Development A Standard of Traffic Signal Controller and Expectations of Standardization
Jeong Jun-Ha ; Ahn Gye-Hyung ; Oh Young-Tae ; Go Gwang-Yong ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 5, issue 1, 2006, Pages 31~43
As of March 2005, the standard of traffic signal controllers became effective. The standard presents specifications and functions of a traffic signal controller which collects traffic information, sends it to the traffic control center, and controls traffic signal with adequate traffic signal timing provided by the traffic control center. Since the controllers by the previous standard lack parts compatibility and have different control functions and communication protocol, the maintenance cost has been increased. Also, some important functions like conflict detection have not worked out perfectly. To overcome these disadvantages, first of all, this standard secures hardware compatibility. Conflict detection method has been enhanced. Communication protocol to the traffic control center was included in the standard. With this standard, independent maintenance system and prompt treatment of hardware malfunctions becomes possible. Also, the unified intersection traffic control method will increase traffic safety.
Performance analysis of TR, DTR and PRM UWB systems in frequency selective channel
Woo Seon-Keol ; Choi Ho-Seon ; Yang Hoon-Gee ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 5, issue 1, 2006, Pages 45~54
The UWB signal distortion in frequency selective channel has made it difficult to implement the channel estimator and the synchronizer of the UWB receiver. In this paper, we examine the performances of TR(Transmitted Reference) and DTR(Differential TR) UWB which use either reference pulse or differential method to estimate the channels. we also propose a FSK-based PRM(Pulse Repetition Modulation) UWB system as an another form of UWB system which is advantageous in frequency selective channel. Finally, resorting to statistical analysis, we examine the noise effect due to noisy reference at an auto-correlation(AcR) receiver. moreover, SNR dependance of the integration length in the AcR receiver is also investigated.
Estimation of Traffic Safety Improvement by Applying a Traffic Control Device
Nam Baek ; Lee Chul-Gi ; Lee Sang-Soo ; Oh Young-Tae ; Yu Tae-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 5, issue 1, 2006, Pages 55~63
Speeding is one of the major causes of traffic accidnets in urban areas. Driver feedback sign(DFS) is a traffic control device that can be used for many traffic environments including work zones, school zones, and roadways. In this paper, the effectiveness of DFS was evaluated through a field study using speed data collected from before and after study periods. In addition traffic safety improvement was also quantitatively estimated using the variance of speed data collected. Staistical test results showed that the speed difference was statistically significant, and the distribution of speed data was also shifted greatly. Therefore, it was concluded that installing the DFS in roadways might lead to unifomity of speed of traffic flow, thus, potential safety improvement might be expected.
UHF Band RFID Tag Antenna Mountable on metallic Object
Jung Jun-Mo ; Yu Byung-Gil ; Jung Byung-Woon ; Lee Byung-Je ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 5, issue 1, 2006, Pages 65~70
A UHF band RFID passive tag antenna, which can be attached on metallic objects, is proposed. The proposed tag antenna is more insensitive to the size of the metallic object than conventional PIFAs or IFAs. It is constructed on a multi-layer and its size is reduced by using a 'L' slit. Performances of the antenna is analyzed by Ansoft's HFSS and measured using a back-scattering method. The simulated and measured data are obtained with varying the size of metallic object.