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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 6, Issue 3 - Dec 2007
Volume 6, Issue 2 - Aug 2007
Volume 6, Issue 1 - Apr 2007
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A Path-Based Traffic Assignment Model for Integrated Mass Transit System
Shin, Seong-Il ; Jung, Hee-Don ; Lee, Chang-Ju ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 1~11
Seoul's transportation system was changed drastically starting the first of June in two thousand. This policy includes integrated distance-based fare system and public transportation card system called smart card. Especially, as public transportation card data contains individual travel, transfer and using modes information it is possible to catch the characteristics of path-based individuals and mass transit. Thus, public transportation card data can contribute to evaluate the mass transit service in integrated public transportation networks. In addition, public transportation card data are able to help to convert previous researches and analyses with link-based trip assignment models to path-based mass transit service analysis. In this study, an algorithm being suitable for path-based trip assignment models is suggested and proposed algorithm can also contribute to make full use of public transportation card data. For this, column generation algorithm hewn to draw the stable solution is adopted. This paper uses the methodology that is to take local approximate equilibrium from partial network and expand local approximate equilibrium to global equilibrium.
Improvement of Optimal Bus Scheduling Model Reflecting Bus Passenger's Degree of Satisfaction
Bae, Sang-Hoon ; Kim, Tag-Young ; Ryu, Byung-Yong ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 12~23
The purpose of this studγ if to understand problem of present bus scheduling system and to develop optimal bus scheduling model which improve bus passenger's degree of satisfaction(DOS) and bus company's operation efficiency at the same time. This study developed optimal bus scheduling model, which reflected bus passenger's degree of satisfaction(DOS), applied to existing model that summery of bus operation cost(
), passenger queuing time cost(
) and passenger travel time cost(
). And optimal bus scheduling model which developed in this study is optimized that using LINGO program based on linear program. Also by using the general case in Busan, compare total cost of present bus scheduling system and existing scheduling model with total cost of optimal bus scheduling model which reflected bus passenger's degree of satisfaction(DOS).
A Model for VMS Message Reading Time Using Driving Simulator
Kim, Tae-Hyung ; Kim, Sung-Min ; Oh, Cheol ; Kim, Jeong-Wan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 24~32
Variable message sign (VMS), which is used for providing real-time information on traffic conditions and accident occurrences, is one of the important components of intelligent transportation systems. It is essential that the scheme of VMS message phase and duration should be designed with the consideration of drivers' message reading time that will be depended on various causal factors, such as the amount of VMS messages, drivers' travel speed, and geometric conditions. However, there have been not much efforts to explore the relationships between the drivers' message reading time and the above causal factors. Driving simulator experiments were conducted to obtain drivers' message reading time with respect to the amount of VMS messages, drivers' travel speed, and different geometric conditions. Regression modeling techniques were applied to develop an estimation model for drivers' message reading time. Probabilistic outcomes of the proposed model would be greatly utilized to design proper VMS message phase and duration.
Design Standard for Lane Operation in Bridges and Tunnels
You, Ho-In ; Oh, Young-Tae ; Lee, Choul-Ki ; Chung, Woo-Hyun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 33~44
Prohibition of lane changes in bridges and tunnels have been many problems in throughputs of expressways caused by heavy vehicles and slow-moving traffics. Nevertheless, those are constructed actively by the general trends, which are preservation of environment and ecosystem are more important, because mountainous districts are about 70% across the whole extent of Korea. In this paper, the proper design standards for permission of lane changes in bridges and tunnels classified into structure, safe, and driver's conveniences are suggested as follows. 1. Right shoulder should have more than 2.5m in bridges and tunnels. 2. Sufficient equipments of guidance like as directional signs, fingerposts, variable message signs, and markings should be established to smooth and safe lane changes of drivers. 3. Snow melting systems should be established in bridges worried about freezing. 4. Tunnels must be not only satisfied standards for prevention of disasters (2004.11) and lighting rules (KSA 3703), but also established anti-freezing facilities in entrance and exit. 5. The drivers should have honed on their car lights.
A Rule-Based Vehicle Tracking with Multiple Video Sequences
Park, Eun-Jong ; So, Hyung-Junn ; Jeong, Sung-Hwan ; Lee, Joon-Whoan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 45~56
Automatic tracking of vehicles is important to accurately estimate the traffic information including vehicle speeds in video-based traffic measurement systems. Because of the limited field of view, the range of visual tracking with a single camera is restricted. In order to enlarge the tracking range for better chance of monitoring the vehicle behaviors, a tracking with consecutive multiple video sequences is necessary. This parer proposes a carefully designed rule-based vehicle racking scheme and apply it for the tracking for two well synchronized video sequences. In the scheme, almost all possible cases that can appear in the video-based vehicle tracking are considered to make rules. Also, the rule based scheme is augmented with Kalman filter. The result of tracking can be successfully used to collect data such as temporal variation of vehicle speed and behavior of individual vehicle behaviors in the enlarged tracking region.
Condition Analysis of Breakdown Occurrence at Freeway Weaving Section
Kim, Sang-Gu ; Kim, Young-Chun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 57~66
Weaving is defined as the crossing of two or more traffic streams traveling in the same general direction along a significant length of highway without the aid of traffic control devices. Compared with other freeway sections, perturbation is easy to happen at weaving section. Because there are a lot of lane-changing maneuvers at the weaving section, traffic is subject to turbulence in excess of that normally presents on freeway basic section. This turbulence causes operational problems and its impact must be considered. The purpose of this paper is to perform a basic study on flow characteristics by lane, which can be achieved through analyzing breakdown phenomenon in the microscopic approach. The study made use of data derived from the aerial photography for the microscopic analysis. This research produced the 30-second interval data such as flows, speeds, and densities for the macroscopic analysis and derived the vehicular data to draw time-space diagram for the microscopic analysis. The paper analyzed the traffic characteristics using flows, speeds and densities variation and investigated the conditions of breakdown occurrence with the time-space diagrams. The breakdown phenomenon was identified at weaving section and the propagation from free flow to synchronized flow was observed in this study. In the future, the findings help develop the traffic operational algorithm to manage the traffic congestion under ubiquitous circumstance since the conditions of breakdown Phenomenon can be understood more.
A Study on the Proper Distance of Tubular Markers for Hi-Pass
Choi, Yoon-Hyuk ; Choi, Kee-Choo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 67~76
Although Hi-pass have been operated for alleviating traffic congestion and enhancing mobility in expressways since 2000, there is not any standard for safe operation. For that reason, we investigated about tubular markers, which is a typical facility for safety in Hi-pass. Tubular Markers are installed for separating same or opposite traffic flows spatially, supporting the marks at a place which has not only high possibility of accidents but distinguished carefulness of drivers. In this paper, it is noted two considerings; one is prevention of accident from the speed gap of autos and Hi-pass vehicles; the other is guarantee of necessary distance that Hi-pass vehicles could be changes the lanes for off-ramp. Focusing those considerations, it is proposed not only prefer distance of tubular markers, but also fundamental basic subjects. We anticipate that the results of this study would be useful reference in more safe and efficient tollgate operation of Hi-pass.
A Study on Error Correction Using Phoneme Similarity in Post-Processing of Speech Recognition
Han, Dong-Jo ; Choi, Ki-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 77~86
Recently, systems based on speech recognition interface such as telematics terminals are being developed. However, many errors still exist in speech recognition and then studies about error correction are actively conducting. This paper proposes an error correction in post-processing of the speech recognition based on features of Korean phoneme. To support this algorithm, we used the phoneme similarity considering features of Korean phoneme. The phoneme similarity, which is utilized in this paper, rams data by mono-phoneme, and uses MFCC and LPC to extract feature in each Korean phoneme. In addition, the phoneme similarity uses a Bhattacharrya distance measure to get the similarity between one phoneme and the other. By using the phoneme similarity, the error of eo-jeol that may not be morphologically analyzed could be corrected. Also, the syllable recovery and morphological analysis are performed again. The results of the experiment show the improvement of 7.5% and 5.3% for each of MFCC and LPC.
Speech Recognition Using the Energy and VQ
Hwang, Young-Soo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 87~94
In this paper, the performance of the speech recognition and speaker adaptation methods are studied. The speech recognition using energy state and VQ(Vector Quantization) is suggested and the speaker adaptation methods(Maximum a posteriori probability estimation, linear specrum estimation) are considered. The experimental results show that recognition ration using energy state is 2-3 % better than that of general VQ.
Study on Folded TEM Horn Antennas for 70 kV Impulse
Lee, Jin-Seong ; Byun, Joon-Ho ; Ahn, Young-Joon ; Lee, Byung-Je ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 95~100
In this paper, a twice folded TEM horn antenna for 70 kV impulse high power system is proposed. The length reduction of 50 % is achieved by folding a conventional TEM horn antenna twice. The array elements are fed by the stripline power divider using the Chebyshev transformer. The power divider feeds four TEM horn antenna elements with an in-phased uniform power, and it covers a wide bandwidth (
, VSWR<2.0). Considering the air breakdown at peak 70 kV impulse, the proposed antenna maintains the 25 mm gaps between conducting plates. The dimension of the twice folded horn antenna is
(mm3), and the operating frequency is from 152 MHz to 750 MHz under 10 dB return loss. The peak gains are measured from 6.77 dBi to 10.70 dBi at
Design of a Circularly Polarized Antenna for UHF Band RFID Reader
Chun, Jong-Hun ; Han, Seung-Jo ; Pyun, Jae-Young ; Lim, Gyeong ; Park, Jong-An ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 101~110
This study has designed a circular polarization antenna for UHF bandwidth RFID reader. As a result of performance test of the antenna designed it is found that return loss (S11) is about -45.529dB at 914MHz, which is relatively small, and antenna gain is about 6.09dBi. It has also been confirmed that
impedance matching is about
and it can be applied to every RFID reader. Therefore, the antenna is designed to have higher gain of circular polarization by improving reception, which is one of the most important parameters of RFID reader and is expected to be extensively used to recognize multi-tag in the distance.
TH-UWB System through Pulse Shaping and Avoiding Interference Technique
Chang, Hong-Mo ; Kim, Tae-Hun ; Kim, Dong-Hee ; Park, Ho-Hwan ; Kwak, Kyung-Sub ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 111~121
In this paper, we propose a TH-Multiband-UWB system through pulse shaping to fit in domestic UWB spectrum regulation. We propose the transmission pulse of Multi-Carrier type for pulse shaping and use Cognitive Radio to detect interfering frequency. We use Genetic Algorithm in Cognitive Radio's calculation propose and propose solution of interference problem between TH-UWB using Cognitive Radio and typical MB-OFDM UWB system or other communication systems. In this paper, we explain how Cognitive Engine detects the interfering frequency. The technique of TH-Multiband-UWB system using Cognitive Radio shows a good performance in interference condition.
Study on Compatibility Analysis between Radio Services
Kang, Jeong-Yong ; Kim, Jin-Young ; Kim, Eun-Cheol ; Kim, Jong-Heon ; Ryu, Chung-Sang ; Oh, Seong-Taek ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 122~137
In this paper, compatibility between different radio services or systems is analyzed when they are in adjacent band or co-channel. The first step of the compatibility analysis is establishing an interference scenario. And an interference pobability from an interfering transmitter to a victim receiver is calculated by means of Monte-Carlo simulation techniques. Then the calculated result is compared with the predefined interference criteria, maximum permissible interference probability and we can determine compatibility in accordance with the active interferer density, channel bandwidth, cell radius, distance between interfering transmitter and victim receiver, and duty cycle. It is assumed that Propagation modes are the free space model and extened Hata model.
A Study on the Introduction of an International Communication Protocol(DATEX-ASN) to Traffic Control System in Korea
Ko, Kwang-Yong ; Lee, Seung-Hwan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 138~152
A communication system based on DATEX-ASN, an international communication protocol for use in COSMOS, a real-time traffic responsive signal system of Seoul, was developed in this study. Through laboratory experiments, it was identified that some additional rules were necessary for its successful application to COSMOS and thus proper complementary rules were devised. Laboratory experiments were to measure error-rates of monitoring information packet, EOC duration and operating cycle-length errors at different data transmission rates and the results of each experiment were compared each other. The results show that the DATEX-ASN protocol requires a transmission rate of at least 9,600bps which is higher than a transmission rate of 4,800bps required by NTCIP.
Developing u-Service Evaluation Methodology for Optimal u-Service Group of u-City Project
Byun, Wan-Hee ; Cho, Hyun-Woo ; Lee, Yong-Taeck ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 153~164
Nowaday, in Korea, many u-City projects have been developed as a core business in the new town development project by national or local level of government. However, the new business projects have some problems, such as excessive number of u-services, increased project funds and period, and lower u-services due to lack of u-service evaluation methodologies. Therefore, this paper proposes a new u-service evaluation methodology to solve current problems. The methodology gives an ability to guard general u-service groups for reaching the main goal of the u-City project, and then select alternative u-service groups against being limited by the law and technology in the project year. Besides, as a key variable on performing u-City plans, the complexity between stakeholders is considered in the methodology. Finally, through the Optimal Sequential Method in the methodology, the maximum value of u-service group is obtained as a optimal service group of u-City.
A Minimum Resources Allocation Algorithm for Optimal Design Automation
Kim, Young-Suk ; Lin, Chi-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 165~173
In this paper, we propose a new minimum resources allocation algorithm for optimal design automation. In the proposed algorithm, the operation are allocated to functional units so that the number of interconnection wires between functional units can be minimized. The registers are allocated to the maximal clusters generated by the minimal cluster partitioning algorithm. Finally, the interconnection is minimized by removing the duplicated inputs of multiplexers and exchanging the inputs across multiplexers. The efficiency of the proposed allocation algorithm is shown by experiments using benchmark examples.
The Estimation of the Number of Spare Parts and the Changing Time about DSRC Road Side Equipment
Han, Dae-Hee ; Lee, Chung-Won ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 6, issue 3, 2007, Pages 174~182
There are not many studies on the maintenance and replacement for the ITS equipments. Most of ITS center has no comprehensive regulation on the equipment replacement. This study was focusing on estimation of equipment replacement period and the number of spare parts in stock using the actual failure data of Road Side Equipment (RSE) by Dedicated Short Range Communication (DSRC). The failure data showed a type of bath-tub curves. The data, however, did not fit to any probability distribution curve, which means that the preventive replacement cannot be strongly applied for the RSE. In the aspect of practical strategy, this study suggest that repairing cost and failure frequency be used for decision of replacement of RSE after the 1 or 2 year warrant period. The future study needs to include more RSE failure data as well as other equipments of the ITS.