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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 7, Issue 6 - Dec 2008
Volume 7, Issue 5 - Oct 2008
Volume 7, Issue 4 - Aug 2008
Volume 7, Issue 3 - Jun 2008
Volume 7, Issue 2 - Apr 2008
Volume 7, Issue 1 - Feb 2008
Selecting the target year
A Conceptual Model for Location Based Public Transit Transfer Information Service
Lim, Jung-Sil ; Moon, Young-Jun ; Oh, Young-Tae ; Lee, Choul-Ki ; Bae, Myoung-Hwan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 1~12
The issues of developing the value added services for public transport connectivity and transfer with information and communication technologies has been discussed in terms of incorporating system facilities with public transit modes to increase the ridership of public transit. This paper demonstrates a conceptual model for providing the location based public transit transfer information service on demand with respect to system requirements, subsystems, and logical architecture based on the national ITS architecture. The subsystems in this study which include transfer information center, parking concierge, user route guidance and information provision system are also investigated in detail in order for information service and/or contents provider to develop business models on public transit connectivity and transfer. This model is expected to be utilized in providing the variety of service models with the different types of public transit connectivity and transfer systems according to the system scale and the public transit modes.
An Evaluation System For Freeway Traffic Data Processing Techniques
Oh, Dong-Wook ; Oh, Cheol ; NamKoong, Sung ; Jeon, Se-Kil ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 13~24
Real-time traffic data are readily obtainable by traffic surveillance systems of intelligent transportation systems (ITS). Such data greatly support further applications in the field of traffic operations, planning, and safety. However, traffic data should be appropriately processed to fully exploit the benefits of data collection capability. Rather than developing individual data processing techniques, which is major concern of existing studies, this study proposes a novel methodology for evaluating data processing techniques in an integrated manner. Also, a tool for implementing the proposed methodology is developed. Users can extract useful and more reliable traffic data based upon their ultimate purpose of data usage by the evaluation tool developed in this study. Actual freeway traffic data are, as an example, fed into the evaluation tool, and results are discussed.
Analysis for Characteristics of Driver's Legibility Performance Using Portable Variable Message Sign (PVMS)
Song, Tai-Jin ; Oh, Cheol ; Kim, Tae-Hyung ; Yeon, Ji-Yoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 25~35
Variable Message Sign(VMS) is one of the subsystem of Intelligent Transportation Systems (ITS), which is useful for providing real-time information on weather, traffic and highway conditions. However, there are various situations such as incidents/accidents, constructions, special events, etc., which would be occurred on segments, it is unable to control traffic with only the VMS. Thus, it is essential to use of PVMS(Portable Variable Message Signs), which can move to the location needed traffic control and provide more active traffic information than VMS. This study developed a legibility distance model for PVMS messages using in-vehicle Differential Global Positioning Data(DGPS). Traffic conditions, drivers' characteristics, weather conditions and characteristics of PVMS message were investigated for establishing the legibility model based on multiple linear regression analysis. The factors such as height of PVMS characters, spot speed, age, gender and day and night were identified as dominants affecting the variation of legibility distances. It is expected that the proposed model would play a significant role in designing PVMS messages for providing more effective real-time traffic information.
Evaluation of Drivers's Preference on Messages Delivered by VMS
Yeon, Ji-Youn ; Kim, Tae-Hyung ; Oh, Cheol ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 36~48
Variable Message Signs(VMS) is one of the important subsystems of Intelligent Transportation Systems (ITS), which is useful for providing drivers with real-time information on traffic, roadway or weather conditions. In order to maximize the effectiveness of the VMS system, it is required to reflect drivers's preference on designing and operating the system. In this context, this study was conducted to develop strategies to deliver the messages in an efficient manner while many other previous studies focused primarily on the contents of the messages, from drivers's perspectives. Drivers's preference on message expression formats and message display orders were investigated through image analysis in the perspectives of a total of 40 subjects. With respect to message expression formats, drivers preferred Gulim or Dodum in font style, middle arrangement of the letters, pictogram combination as opposed to letters only, blank time less than 0.5 sec, appearing message in animation effect, messages in single phase, non-flashing message. In the matter of message display orders, drivers preferred to obtain link or traffic information in the lust place. Then, they desired to be informed of roadway condition and instructions or recommendations for drivers to cope with unexpected events among various messages for traffic condition.
Development of a Real-Time Video Image Tracking Algorithm for Incident Detection
Oh, Ju-Taek ; Min, Joon-Young ; Heo, Byung-Do ; Kim, Myung-Seob ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 49~60
The current VIPS are not effective in safety point of view, because they are originally developed for mimicking loop detectors. Therefore, it is important to identify vehicle trajectories in real time, because recognizing vehicle movements over a detection zone enables to identify which situations are hazardous, and what causes them to be hazardous. In order to improve limited safety functions of the current VIPS, this research has developed a computer vision system of monitoring individual vehicle trajectories based on image processing, and offer the detailed information, for example, incident detection and conflict as well as traffic information via tracking image detectors. This system is capable of recognizing individual vehicle maneuvers and increasing the effectiveness of various traffic situations. Experiments were conducted for measuring the cases of incident detection and abnormal vehicle trajectory with rapid lane change.
Design of 5.8 GHz Patch Array Antenna for FTMS Roadside Equipment
Kwon, Han-Joon ; Lee, Jae-Jun ; Lee, Seung-Hwan ; Kim, Yong-Deak ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 61~70
This paper designed the antenna for collecting and servicing the traffic information that apply to freeway Traffic Management System, as using DSRC (Dedicated Short Range Communication). Active DSRC is the technology that is using 5.8GHz Radio Frequency to a mean Sequency and there are a lot of the case occurring a physical electric wave shadowing because of the traveling straight of a electric wave. In such inferior communication environment, it constructed the stabilized communication link that can do collecting and servicing the correct traffic information and designed the beam pattern considering the establishment position of the antenna that can apply to various road environments and a communication area. By considering the communication link environment, this paper designed and manufacture the mean frequency of 5.8GHz, the input loss of -17dB in 75MHz bandwidth, the Axial ratio of 1.5:1, and
array microstrip antenna which beam pattern have the characteristic of
horizontal half power beam width and
elevation half power beam width and the minimum establishment height of the antenna was designed as 14m for avoiding electric wave shadowing on a physical condition between vehicles
Wideband Monopole Antenna for Multiband Mobile Communication Applications
Rhyu, Han-Phil ; Lee, Hyun-Kyu ; Lee, Byung-Je ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 71~75
A folded monopole antenna is proposed for mobile communication applications. The proposed antenna covers CDMA and GSM at low frequency band, and it has a wide bandwidth (6.85 GHz) at high frequency band to cover GPS, DCS, USPCS, UHfS, WLAN (2.4, 5.2, 5.8 GHz), and the future application of IEEE 802.16e mobile WiMAX.
A Study on 800 MHz 1W Cartesian Feedback Linearized Power Amplifier for TETRA Signals
Oh, Duk-Soo ; Kim, Ji-Yeon ; Chun, Sang-Hyun ; Kim, Jong-Heon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 76~85
In this paper, a 800 MHz 1 W cartesian feedback linearized power amplifier is designed and fabricated for TETRA handset application. For amplification of TETRA signal with 200 kHz narrow bandwidth, amplifier linearization performance of more than 30 dBc is improved through the cartesian feedback linearizer at the offset Sequency of
kHz. It is clear that the linearization performance is affected by imbalance of gain and phase between I/Q signals and also DC offset. The linearization performance can be maximized by the compensation of those influences. Cartesian feedback is suitable for a liearization technique of narrow band signal with QAM and another modulation signals, as well.
A Broad-band Rectenna Using Stub Filter
Oh, Kyoung-Min ; Lee, Hyun-Wook ; Nam, Hee ; Yoon, Ki-Cheol ; Hong, Tae-Ui ; Lee, Dae-Sung ; Hwang, Hak-In ; Lee, Jong-Chul ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 86~96
In this paper, a new broadband rectenna is presented for the wireless transmission of microwave power. The new broadband rectenna element is based on a new printed monopole broadband antenna with size reduction using surface current distribution and a new broadband stub bandpass filter with suppression of second harmonics. A RF-to-DC conversion efficiency of 80% using a 270 ohm load resistor is obtain at 2.45 GHz. Also, a conversion efficiency of above 50 % is maintained from 1.8 GHz to 2.8 GHz.
An Implementation of DB Query Collecting and Analyzer Using Packet Interceptor
Lim, Jae-Deok ; Lim, Sung-Han ; Baek, Nam-Chul ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 97~106
This proposed system is a part of internal control system that national highway need to support their ITS information audit. This paper explains the design and implementation of a packet interceptor and a DB query analyzer. The packet interceptor sniffs users' query packets, and then the DB query analyzer parses the SQL queries and stores the users' DB access information such as SQL queries, access data and changing data. The information may be used as the evidences on internal control of users and users' accesses.
Performance Analysis of IR/RF-DSRC for Improved High Density ITS Service
Kwag, Su-Jin ; Kim, Jea-Myoung ; Lee, Sang-Sun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 107~117
OBE(On Board Equipment) of IR(Infrared)/RF(Radio Frequence)-DSRC(Dedicated Short Range Communication) are set up 1.25 million cars because Korea Highway Cooperation supplied in HiPass(Domestic Electronic Toll Collection System). But this DSRC system has strength and weakness of service for BIS(Bus Information System) or UTIS(Urban Traffic Information System) because BIS and UTIS are required vary high communication's performance and management. In this paper, Efficiency of IR/RF-DSRC is analyzed performance of MAC(Medium Access Control) by computer simulation for services of BIS or UTIS, so Suggested to be commensurated with medium of there service. Specially, DSRC is needed high mobility and throughput in the vary short communication range, so Analysed the transmission rate of data in each communication medium over the specific character of the MAC frame.
An Energy-Efficient Self-organizing Hierarchical Sensor Network Model for Vehicle Approach Warning Systems (VAWS)
Shin, Hong-Hyul ; Lee, Hyuk-Joon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 118~129
This paper describes an IEEE 802.15.4-based hierarchical sensor network model for a VAWS(Vehicle Approach Warning System) which provides the drivers of vehicles approaching a sharp turn with the information about vehicles approaching the same turn from the opposite end. In the proposed network model, a tree-structured topology, that can prolong the lifetime of network is formed in a self-organizing manner by a topology control protocol. A simple but efficient routing protocol, that creates and maintains routing tables based on the network topology organized by the topology control protocol, transports data packets generated from the sensor nodes to the base station which then forwards it to a display processor. These protocols are designed as a network layer extension to the IEEE 802.15.4 MAC. In the simulation, which models a scenario with a sharp turn, it is shown that the proposed network model achieves a high-level performance in terms of both energy efficiency and throughput simultaneously.
Internet Push Service Using Tunneling Technology
Oh, Jong-Taek ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 7, issue 4, 2008, Pages 130~135
Broadcasting services using Internet and Internet protocol have been developed actively. In this paper, push service technologies based on tunneling protocol and for the case of base stations using private IP addresses are proposed. This could be very proper to the broadcasting services for location & traffic information and disaster relief.