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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
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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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Development of a Communication Protocol for a Digital Traffic Signal Controller
Kim, Min-Sung ; Ko, Kwang-Yong ; Lee, Choul-Ki ; Jeong, Jun-Ha ; Heo, Nak-Won ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 1~10
DOI : 10.12815/kits.2013.12.3.001
Most of the current traffic signal controller use load switches to transmit high voltage power to the signal lamps. The direct transmission of high voltage power may cause a lot of problems like leakages of electric power, obstructions of pedestrian, environmental disfigurements. To overcome these problems, the development of digital type signal controller has been trying in the various methods. Digital communication between a master controller and signal lamps is the most important part to improve control performance in the digital type controller. A communication system for the digital signal controller was developed in this study. The system bases on CAN specification, includes ID structure for most peripheral devices like loops, signal lamps, push buttons, police switches. The operability of this system verified with a software based CAN simulation tool.
A Study on the Analysis for the Effects of the Section Speed Enforcement System at the Misiryeong tunnel section
Lee, Ho-Won ; Joo, Doo-Hwan ; Hyun, Cheol-Seung ; Jeong, Jun-Ha ; Park, Boo-Hee ; Lee, Choul-Ki ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 11~18
DOI : 10.12815/kits.2013.12.3.011
Since 1996, Korean National Police Agency has been promoting a project for installation of Automated Speed Enforcement (ASE) system aiming at reduction of accidents. The number has increased to 5,348 stations throughout country as of December 2012. Recently, the Section Speed Enforcement Systems have been installed at many sites to produce a general effect well beyond the localised effect at overt fixed camera sites. In this study aims, we have analyzed the effects of the Section Speed Enforcement System at the Misiryeong tunnel section. We have found that there were a statistically significant 21.4%~31.% reduction of the average speed and 45.9% reduction in a number of traffic accidents per month. Accordingly, the study indicates that the Section Speed Enforcement Systems at Misiryeong tunnel section has effective to produce road safety.
Quantitative Evaluation of the Semi-Actuated Signal Control Systems
Kim, Seung-Jin ; Lee, Sang-Soo ; Lee, Choul-Ki ; Park, Sung-Kyun ; Lee, Ho-Jun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 19~28
DOI : 10.12815/kits.2013.12.3.019
This study evaluated the quantitative effects of the deployment of semi-actuated signal systems using field data. For this, a semi-actuted signal system was deployed in the regional roadway network extensively. This paper investigated an operating strategy of semi-actuated signal systems for field application, and implemented the functional strategy into the standard signal controller. The performance was evaluated using three measures of effectiveness such as traffic volume, travel time, and the number of delayed vehicle. From the analysis results, traffic volume increased about 9.4% and 11.3% for morning and evening peak periods, respectively. The average travel time was reduced about 6.3% and 7.8% during morning and evening peak periods, respectively because of the expansion of bandwidths for major streets. In addition, the number of delayed vehicles was reduced about 36.4% and 23.9% for morning and evening peak periods, respectively. It is expected that the effectiveness of signal control system can be improved by incorporating a properly designed semi-actuated signal system in regional roadways with directional demand variation.
Developing Data Exchange Standard between Roadside-device and Traffic Information Center in accordance with ISO 15784
Lee, Sang-Hyun ; Son, Seung-Neo ; Kim, Nam-Sun ; Cho, Yong-Sung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 29~41
DOI : 10.12815/kits.2013.12.3.029
This study set out to developing data exchange standard between roadside device and traffic information center fitted in a domestic environment by applying international standard ISO 15784. First, we defined message basic concept of 'Dialog' and essential elements should be defined to define the standard message for securing system compatibility by reference ISO 14817 and ISO 14827 Part 1. For defining standard message items exchanged between AVI and traffic information center, we formed Working Group under ITS Standards Technical Committee and analyzed data flow for ITS National Architecture, Standard messages of existing standards, and AVI operation messages actually operated on roadside now. So, we extracted 14 functionally needed messages and defined 28 standard messages adopting 'Dialog' concept. In case of the application protocol for data exchange standards, we defined basic requirements for securing interoperability and interchangeability considering domestic environment by analyzing reference standard of ISO 15784.
Estimation of VMS Traffic Information Value Using Contingent Valuation Method
Choi, Jung Yoon ; Yu, Jeong Whon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 42~52
DOI : 10.12815/kits.2013.12.3.042
In this study, value of VMS (Variable Message Sign) traffic information is estimated by using CVM (Contingent Valuation Method), which is developed to quantify the value of non-marketable goods in environmental economics. CVM is used to estimate the value of goods provided by a project under consideration and then the project feasibility can be indirectly examined on the basis of the estimated value. This study focuses on estimating to estimate value of traffic information provided through VMS, a part of the transportation system enhancement project by Korea Expressway Corporation which is aimed at mitigating traffic problems on expressways. In particular, this study analyzes value of information separately by trip purpose, information type, and traffic flow condition. A state preference survey was designed to estimate the value of non-marketable traffic information. To maximize reliability of the survey results, a pilot survey was taken before the main survey. The open-ended question method was adopted in capturing users' willingness-to-pay. Both Tobit and binary Probit models were applied in estimating the value of VMS traffic information and their parameters were estimated using the maximum likelihood estimation. The estimation results suggests that the value of traffic information perceived by users is 518.28 KRW.
Analysis of Car Following Model of Adaptive Cruise Controlled Vehicle Considering the Road Conditions According to Weather Circumstance
Kim, Tae-Uk ; Bae, Sang-Hoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 53~64
DOI : 10.12815/kits.2013.12.3.053
The car-following model is one of core models in Advanced Vehicle & Highway Systems (AVHS). The car-following model has been developed in aspects such as human factor and reduction error rates. However, the consideration of safety depending on weather condition has not been completed yet. In this paper, therefore, changes of driving condition for car-following due to different road condition were dealt with, and optimal safety distance corresponding to road condition such as dry, wet and snowy were computed. The GMIT(GM Model with Instantaneous T) model was picked over for simulation of adaptive cruise control applied the suggested optimal safety distance. As the results, the 1.7 times longer safety distance was required for wet road condition than dry road condition, and the 5.6 times longer safety distance was required for snowy road condition.
Methodology for Estimating Safety Benefits of Advanced Driver Assistant Systems
Jeong, Eunbi ; Oh, Cheol ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 65~77
DOI : 10.12815/kits.2013.12.3.065
Recent advanced sensors and communication technologies have been widely applied to advanced safety vehicle (ASV) for reducing traffic accident and injury severity. To apply the advanced safety vehicle technologies, it is important to quantify the safety benefits, which is a fundamental for justifying application. This study proposed a methodology for quantifying the effectiveness of the advanced driver assistant system (ADAS), and applied the methodology to lane departure warning system (LDWS) and automatic emergency braking system (AEBS) which are typical advanced driver assistant systems. When the proposed methodology is applied to 2008-2010 gyeonggi-province crash data, LDWS would reduce about 10~14% of relevant crashes such as head-on, run-off-the road, rollover and fixed-object collisions on the road. In addition, AEBS could potentially prevent about 50% of total rear-end crashes. The outcomes of this study support decision making for developing not only vehicular technology but also relevant safety policies.
Hybrid MIMO Antenna for the Mobile Handset
Son, Taeho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 78~86
DOI : 10.12815/kits.2013.12.3.078
A hybrid MIMO(Multi Input Multi Output) antenna which is operating both a monopole and a IFA(Inverted F Antenna) is designed. It's applied Vlade(Vertical lade) technique to reduce antenna space, and a diagonally fed MIMO antenna is designed on the bare board for the data communication. Return losses due to variables of antenna length are simulated for the design. Antenna for the hexa-frequency band of LTE700, CDMA, GSM, DCS, PCS and WCDMA is designed and implemented. This antenna is satisfied 3:1 VSWR over the whole design band by the measurement of return loss. And average gains and efficiencies were -3.67 ~ -2.53dBi and 42.06 ~ 55.84% for LTE700/CDMA/GSM frequency band, -3.27 ~ -1.21dBi and 47.08 ~ 75.6% for DCS/PCS/WCDMA frequency band. The isolation between 2 antenna that is one of important factors for the MIMO system was measured good performance as -8.14 ~ -25.77dB over the whole service band.
Study on Relaying Path Selection Using One-Hop Channel Information in Decode-and-Forward Relaying Based Multi-Hop Systems
Lee, In-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 87~95
DOI : 10.12815/kits.2013.12.3.087
In this paper, the outage probability of efficient partial relay selection(EPRS) using only one-hop channel information in multi-hop systems is analyzed in Rayleigh fading channels. In particular, we derive an exact and closed-form expression for the outage probability of decode-and-forward relaying based EPRS. In order to prove the usefulness of EPRS in multi-hop systems, we also analyze the correlation between the end-to-end signal-to-noise ratio(SNR) and the SNR for each hop at an arbitrary relaying path. Furthermore, through numerical investigation, we compare the outage performances for EPRS and the best relay selection using all channel information.
Performance evaluation of WAVE communication systems under a high-speed driving condition in a highway
Song, Yoo Seung ; Lee, Sang Woo ; Oh, Hyun Seo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 96~102
DOI : 10.12815/kits.2013.12.3.096
In recent years, a variety of ITS services are available such as driving information, road conditions, V2X messages as well as navigation and traffic jams notification. The development of ITS services is accelerating by V2X communication technologies for high-speed vehicles. In this paper, WAVE communication devices based on the IEEE802.11p standard is introduced as a solution of V2X communication technologies. The H/W and S/W structures of the WAVE communication device and the characteristics of RF/antenna are described. The performance is evaluated in the test road by measuring throughput, PER and latency. The implemented WAVE communication device has 6~7 Mbps throughput with 10% PER at 1km coverage. The packet latency is less than 3ms for the whole test road. It is shown that the implemented WAVE technology is satisfactory to provide ITS services and Internet video-streaming services.
Asymptotical Shock Wave Model for Acceleration Flow
Cho, Seongkil ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 103~113
DOI : 10.12815/kits.2013.12.3.103
Shock wave model describes the propagation speed of kinematic waves in traffic flow. It was first presented by Lighthill and Whitham and has been deployed to solve many traffic problems. A recent paper pointed out that there are some traffic situations in which shock waves are not observable in the field, whereas the model predicts the existence of waves. The paper attempted to identify how such a counterintuitive conclusion results from the L-W model, and resolved the problem by deriving a new asymptotical shock wave model. Although the asymptotical model successfully eliminated the paradox of the L-W model, the validation of the new model is confined within the realm of the deceleration flow situation since the model was derived under such constraint. The purpose of this paper is to derive the remaining counter asymptotical shock wave model for acceleration traffic flow. For this, the vehicle trajectories in a time-space diagram modified to accommodate the continuously increased speed at every instant in such a way that the relationship between the spacing from the preceding vehicle and the speed of the following vehicle strictly follows Greenshield's model. To verify the validity of the suggested model, it was initially implemented to a constant flow where no shock wave exists, and the results showed that there exists no imaginary shock wave in a homogeneous flow. Numerical applications of the new model showed that the shock wave speeds of the asymptotical model for the acceleration flow tend to lean far toward the forward direction consistently. This means that the asymptotical models performs in a systematically different way for acceleration and for declaration flows. Since the output difference among the models is so distinct and systematic, further study on identifying which model is more applicable to an empirical site is recommended.
Development of Greenhouse Gas Estimation Method for a Local Government Level Using Traffic Demand Model
Maurillo, Pennie Rose Anne R. ; Jung, Hyeon-Ji ; Lee, Seon-Ha ; Ha, Dong-Ik ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 12, issue 3, 2013, Pages 114~128
DOI : 10.12815/kits.2013.12.3.114
Greenhouse gas emissions have been an important issue in different countries because of their effects on global warming. The government has to organize greenhouse gas reduction measures suitable to regional characteristics by establishing annual implementation plans and comprehensive policies based on the UNFCCC. The transportation sector is one of the major contributors of air pollution; hence increasing need to estimate current and future traffic emissions precisely. Under these circumstances, a number of emission models have been developed recently. However, current methods of estimation cannot carry out effective analyses because it does not reflect vehicle movement characteristics. This study aims to present a new method for calculating road traffic emissions in Goyang city. A travel demand model is utilized to carry out GHG emission estimates according the traffic data (fleet composition, vehicle kilometers travelled, traffic intensity, road type, emission factors and speed). This study evaluates two approaches to estimate the road traffic emissions in Goyang City: Pollution-Emis and the Handbook of Emission Factors for Road Transport (HBEFA v.3.1) which is representative of the "average speed" and the "traffic situation" model types. The evaluation of results shows that the proposed emission estimation method may be a good practice if vigilant implementation of model inputs is observed.