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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 11, Issue 6 - Dec 2012
Volume 11, Issue 5 - Oct 2012
Volume 11, Issue 4 - Aug 2012
Volume 11, Issue 3 - Jun 2012
Volume 11, Issue 2 - Apr 2012
Volume 11, Issue 1 - Feb 2012
Selecting the target year
Development of Traffic Safety Monitoring Technique by Detection and Analysis of Hazardous Driving Events in V2X Environment
Jeong, Eunbi ; Oh, Cheol ; Kang, Kyeongpyo ; Kang, Younsoo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 1~14
DOI : 10.12815/kits.2012.11.6.001
Traffic management centers (TMC) collect real-time traffic data from the field and have powerful databases for analysing, recording, and archiving the data. Recent advanced sensor and communication technologies have been widely applied to intelligent transportation systems (ITS). Regarding sensors, various in-vehicle sensors, in addition to global positioning system (GPS) receiver, are capable of providing high resolution data representing vehicle maneuverings. Regarding communication technologies, advanced wireless communication technologies including vehicle-to-vehicle (V2V) and vehicle-to-vehicle infrastructure (V2I), which are generally referred to as V2X, have been widely used for traffic information and operations (references). The V2X environment considers the transportation system as a network in which each element, such as the vehicles, infrastructure, and drivers, communicates and reacts systematically to acquire information without any time and/or place restrictions. This study is motivated by needs of exploiting aforementioned cutting-edge technologies for developing smarter transportation services. The proposed system has been implemented in the field and discussed in this study. The proposed system is expected to be used effectively to support the development of various traffic information control strategies for the purpose of enhancing traffic safety on highways.
The Macroscopic Model for Signalized Intersections to Consider Progression in relation to Delay
Han, Yohee ; Kim, Youngchan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 15~22
DOI : 10.12815/kits.2012.11.6.015
A performance index of singalized intersections is a standard to optimize signal control variables and to manage traffic flow. Traffic delays is generally used to minimize the average delay time on intersections or networks, progression efficiency is used to improve travel speed of main cooridors or to provide transit signal priority. We manage traffic flows with only selecting one index between delays and progression according to the objective of traffic management and field characteristics. In real field, the driver's satisfaction is high in any performance criteria when the waiting time is shorter and the unnecessary stop in front of traffic is smaller. This paper aims to develop simulation model to represent real progression with concurrently considering delays and progression. In order to reflect an effect of level of traffic volumes and residual queues which don't be considered in prior progression model, we apply shockwave model with flow-density diagram. We derive Cell Transmission Model of Daganzo in order to develop the delay index and the progression index for the macroscopic simulation model. In order to validate the effect, we analysis traffic delays and progression efficiency with comparing this model to Transyt-7F and PASSER V.
A Study on the Integration of Automatic Enforcement Equipment and UTIS Base Station
Hong, Kyung-Sik ; Jung, Jun-Ha ; Yoo, Sung-Jun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 23~30
DOI : 10.12815/kits.2012.11.6.023
In this paper, we suggested the integration between automatic enforcement system and UTIS(Urban Traffic Information System) base station. UTIS base station and automatic enforcement system are different in the height of installation and the type of communication network. UTIS base station is 25 meter high and communicate with center system by optical network. Whereas automatic enforcement system is 6.6 meter high and communicate with center system by rental network. For the purpose of suggesting the efficient method of integration, research was as in the following. We found that the number of integrated system was 1,628 through the present state of analysis and UTIS equipment was satisfied with the required specifications through field testing. Also we suggested the appropriate configuration of the integrated system and analyzed that the cost of the integrated system installment is 1/5 lower than that of the legacy system installment.
Vehicle Running Characteristics for Interrupted Traffic Flow by Using Cellular Automata
Jung, Kwangsu ; Do, Myungsik ; Lee, Jongdal ; Lee, Yongdoo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 31~39
DOI : 10.12815/kits.2012.11.6.031
This study aims to suggest a methodology of localizing and calibrating parameters, such as acceleration, deceleration, and lane changing which are the basis of car following model in interrupted traffic flow to overcome the limitation of origin and destination based transportation simulation and to verify the application of activity-based model for use in Korean roadway condition in a large scale area or a city. Especially, we figured out that a proper cell size reflecting Korean traffic conditions is 1.0m rather than 7.5m which is default size and a methodology of tracking vehicle behavior characteristics through tracking vehicle ID is suggested on this study. In addition, vehicle running characteristics in real interrupted traffic flow is analyzed through subdividing vehicle types and updating vehicle type ratio. For verification of suggested model, some portion of Dalgubyul-ro in the Daegu city is tested, and the possibility of realization of interrupted traffic flow in simulation is studied.
A Study on the Construction of Historical Profiles for Travel Speed Prediction Using UTIS
Ki, Yong-Kul ; Ahn, Gye-Hyeong ; Kim, Eun-Jeong ; Bae, Kwang-Soo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 40~48
DOI : 10.12815/kits.2012.11.6.040
In this paper, we suggests methods for determining optimal representative value and the optimal size of historical data for reliable travel speed prediction. To evaluate the performance of the proposed method in real world environments, we did field tests at four roadway links in Seoul on Tuesday and Sunday. According to the results of applying the methods to historical data of Central Traffic Information Center, the optimal representative value were analyzed to be average and weighted average. Second, it was analyzed that 2 months data is the optimal size of historical data used for travel speed prediction.
Short-Term Impact Analysis of DTG Installation for Commercial Vehicles
Lee, Seok-June ; Lee, Chungwon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 49~59
DOI : 10.12815/kits.2012.11.6.049
Recently, various alternatives for safety and efficiency of commercial vehicles have been considered, and one of the new alternatives is the application of a digital tachograph. In Korea, the installation of a digital tachograph to commercial vehicles was regulated from 2011 and Korea Transportation Safety Authority developed e-TAS to analyze the monitoring data from digital tachographs installed in the order of 100 commercial vehicles. This study performs the potential impact analysis of the DTG installation, which includes a trend of dangerous driving, a trend of traffic accidents and cost-effective analysis, a trend of fuel consumption and cost-effective analysis, a cost-effective analysis of social benefits using e-TAS data. Depending on the frequency of dangerous driving, the participants are divided into three groups; high-dangerous group, average-dangerous group and low-dangerous group. The high-dangerous driving group shows lower km/liter than the low-dangerous driving group by 15% for buses and taxis and by 30% for trucks. About
emission, the difference becomes bigger; 25%, 25% and 42% for buses, taxis and trucks, respectively. Although this study is a short-term period analysis, the methodology will be applicable for the long-term period analysis with larger data.
Analysis for Changes of Mode Choice Behavior from Providing Real-time Schedule for Public Transportation by Smartphone Application
Choi, Sung-Taek ; Rho, Jeong-Hyun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 60~69
DOI : 10.12815/kits.2012.11.6.060
Public Transport Information Service which use smartphone Apps has received attention as the way of solution that reduced transport problem. Smartphone can offer real-time information because of a LBS(Location Based Service) system. This study try to find out which factor affect mode choice ratio of public transport, especially smartphone Apps. The result shows that rising oil price, traffic congestion, public information service with smartphone apps, BIS(Bus Information System) factors get 0.39, 0.27, 0.18, 0.16 scores with paired comparison. Younger and student respondents prefer smart phone public information service. Decision Tree shows that the most important decision factor is smartphone information service factor.
Performance Comparison of Relay Selection-Based Amplify-and-Forward Relaying Systems using Full or Partial Channel Information
Lee, In-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 70~80
DOI : 10.12815/kits.2012.11.6.070
In this paper, we consider the amplify-and-forward relaying systems with the relay selection (AF-RS) using full channel information (FCI) and using partial channel information (PCI), respectively, in which the direct communication link between a source and a destination is available. And, the outage probabilities for the AF-RS using FCI and using PCI are investigated in Rayleigh fading channels, respectively. We provide exact outage probabilities, tight outage probability lower bounds, and asymptotic outage probabilities, respectively. And also, we present coding gains achievable by the AF-RS using FCI and using PCI. Through numerical investigation, all the analytic expressions are verified, and the coding gains are respectively evaluated with different average channel powers for the first and the second hop as well as different numbers of relays.
Spatial Coding using Data Information and Antenna Selection Technique in MIMO System
Song, Jae-Woong ; Kim, Back-Hyun ; Jeong, Rag-Gyo ; Kwak, Kyung-Sup ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 81~88
DOI : 10.12815/kits.2012.11.6.081
Space diversity and space multiplexing gain can be achieved with MIMO system. This paper proposes spatial coding method to MIMO system using data information and antenna selection technique. This technique provides coding gain as well as space diversity gain. For MIMO system with BPSK modulation, BER performance is analyzed and space diversity gains are compared through simulation in terms of data maldistribution degree.
Proposal and Performance Comparison for a Packet Loss Reduction Scheme of DMM
Ha, Sang-Hyuk ; Min, Sang-Won ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 89~94
DOI : 10.12815/kits.2012.11.6.089
In this paper, we considered the performances of PMIPv6 and DMM in the viewpoints of traffic load change and packet delivery latency time, where a new buffering in the previous MAAR is proposed to reduce packet loss during handover. To show the superiority of the DMM and to validate the operation of the buffering scheme, we accomplished its simulation under the typical handover. Our performance comparison results show that the DMM is better than the performance of traffic load change and packet delivery latency time of PMIPv6. We can see that the proposed buffering scheme is better than the existing one in terms of packet loss.
A Distributed Method for Constructing a P2P Overlay Multicast Network using Computational Intelligence
Park, Jaesung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 95~102
DOI : 10.12815/kits.2012.11.6.095
In this paper, we propose a method that can construct efficiently a P2P overlay multicast network composed of many heterogeneous peers in communication bandwidth, processing power and a storage size by selecting a peer in a distributed fashion using an ant-colony theory that is one of the computational intelligence methods. The proposed method considers not only the capacity of a peer but also the number of children peers supported by the peer and the hop distance between a multicast source and the peer when selecting a parent peer of a newly joining node. Thus, an P2P multicast overlay network is constructed efficiently in that the distances between a multicast source and peers are maintained small. In addition, the proposed method works in a distributed fashion in that peers use their local information to find a parent node. Thus, compared to a centralized method where a centralized server maintains and controls the overlay construction process, the proposed method scales well. Through simulations, we show that, by making a few high capacity peers support a lot of low capacity peers, the proposed method can maintain the size of overlay network small even there are a few thousands of peers in the network.
A Study on Efficient Vehicular Safety Message Broadcast Scheme using GPS Information in VANET
Han, Seung-Hwa ; Lee, Cheol-Hee ; Kim, Young-Beom ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 103~110
DOI : 10.12815/kits.2012.11.6.103
In Vehicle Safety Communication (VSC), noted as a representative application of VANET technologies, emergency warning messages (EWM) are broadcast over vehicles in response to an emergency situation. However, as the number of vehicles increases, the so-called Broadcast Storm Problem often occurs due to a huge number of redundant EWM transmitted. Though many approaches in the literature have been proposed to solve the problem, most of them require the preliminary phase for setting up or refreshing neighbor relationship through exchanging beacon messages with nearby vehicles, thereby further increasing the traffic load. In this paper, we propose Longest Leaping Relay (LLR) scheme which can efficiently solve the Broadcast Storm Problem without any preliminary phase for setting up neighbor relationship. Through computer simulations, we compared the performance of the proposed scheme with competitive schemes and verified the proposed scheme outperforms the existing schemes.
Integration of UTIS and WIS information for Determining Speed Limits of Variable Speed Limit System
Son, Hyun-Ho ; Lee, Choul-Ki ; Lee, Sang-Soo ; Yun, Il-Soo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 111~122
DOI : 10.12815/kits.2012.11.6.111
There has been a strong demand for providing diverse services to drivers utilizing existing ITS infrastructure. To this end, this study is aiming at improving the accuracy of a variable speed limit system by determining recommended speeds for the system utilizing the information from Urban Traffic Information System(UTIS) and Weather Information System(WIS). In order to determine appropriate speed limits under inclement weather conditions for the variable speed limit system, this study examined three methods: i) the method utilizing the information from WIS, ii) the method utilizing the information from UTIS, and iii) the method which combines the information from WIS and UTIS using different weights for diverse weather conditions. Finally, this study selected the third method which determines an appropriate speed limit using the relationship between the vehicle operating speed and the minimum stopping distance which is estimated using the existing speed limit, surface coefficient of friction and superelevation.
The Realization on GAS Sensor Module for Inteligent Wireless Communication
Kim, Hyo-Chan ; Weon, Young-Su ; Cho, Hyung-Rae ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 123~132
DOI : 10.12815/kits.2012.11.6.123
Gas sensors has been used very differently that depending on following purposes; Automotive (exhaust gas, fuel mixture gas, oxygen, particulates), agriculture / food industry (fresh, stored, CO2, humidity, NH3, nitrogen oxide gas, organic gas, toxic gas emitted from pesticides and insecticides), industrial / medical (chemical gas, hydrogen, oxygen and toxic gases), military (chemical weapon), environmental measurements (CO and other air pollution consisting of sulfur and nitrogen gas), residential (LNG, LPG, butane, indoor air, humidity). The types of industrial toxic substances are known about 700 species and many of these exist in gaseous form under normal conditions. he multi-gas detection sensors will be developed for casualties that detect the most important and find easy three kinds of gases in marine plant; carbon dioxide(CO2), carbon(CO), ammonia(NH3). Package block consists of gas sensing device minor ingredient, rf front end, zigbee chip. Develope interworking technology between the sensor and zigbee chip inside a package. Conduct a performance test through test jig about prototype zigbee sensor module with rf output power and unwanted emission test. This research task available early address when poisonous gas leaked from large industrial site and contribution for workers' safety at the enclosed space.
Comparative Analysis of Elderly's and Non-elderly's Human Traffic Accident Severity
Lee, Sang Hyuk ; Jeung, Woo Dong ; Woo, Yong Han ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 133~144
DOI : 10.12815/kits.2012.11.6.133
This study focused on estimating influential factors of traffic accidents and analyzing traffic accident severity of elderly and non elderly using traffic accident data. In order to reclassify elderly and non elderly traffic accident by a statistical method from entire traffic accident data, multiple discriminant analysis was applied. Also ordered logit model was applied for analyzing traffic accident severities using traffic accident severities as an independent variable and transportation facilities, road conditions and human characteristics as dependent variables. As results of the comparison between elderly and non elderly traffic accident, the traffic accident severity was affected by the age, types of traffic accidents, human characteristics and road conditions as well. Also, transportation facilities and road conditions affected to more elderly traffic accident than non elderly. Therefore, traffic accident severity would be decreased with the improvement of transportation facilities and road conditions for the elderly.
Development of Accident Forecasting Models in Freeway Tunnels using Multiple Linear Regression Analysis
Park, Ju-Hwan ; Kim, Sang-Gu ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 145~154
DOI : 10.12815/kits.2012.11.6.145
This paper analyzed the characteristics of traffic accidents in all tunnels on nationwide freeways and selected some various independent variables related to accident occurrence in tunnels. The study aims to develop reliable accident forecasting models using the various dependent variables such as the number of accident (no.), no./km, and no./MVK. Finally, reliable multiple linear regression models were proposed in this paper. This study tested the validity verification of developed models through statistics such as
, F values, multicollinearity, residual analysis. The paper selected the accident forecasting models considering the characteristics of tunnel accidents and two models were finally proposed according to two groups of tunnel length. In the selected models, natural logarithm of ln(no./MVK) is used for the dependent variable and AADT, vertical slope, and tunnel hight are used for the independent variables. The reliability of two models was proved by the comparison analysis between field data and estimating data using RMSE and MAE. These models may be not only effective in evaluating tunnel safety under design and planning phases of tunnel but also useful to reduce traffic accidents in tunnels and to manage the traffic flow of tunnel.
Determination of Letter Size of Traffic Sign depending on Driver's Visual Acuity
Kim, Sang-Gu ; Chung, Bong-Jo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 6, 2012, Pages 155~163
DOI : 10.12815/kits.2012.11.6.155
At present the letter sizes of traffic sign are variously designated as 22 cm through 60 cm, however the basis for determination has not been found so far. Driver's visual acuity for getting a driver licence is required higher than 0.5. In order to interpret the information of traffic signs effectively, the minimum requirement of driver's visual acuity must be applied to determine the letter size of traffic sign. Therefore we reviewed that a driver with visual acuity of 0.5 could read the current letter sizes of traffic sign. In addition, a methodology was developed to determine the letter size of traffic sign satisfied with the driver's visual acuity of 0.5. This study established scenarios that were composed of visual acuity, reaction time, the number of lane and the letter sizes of traffic sign for each scenario were proposed. Current letter size of traffic sign would not be difficult for drivers with minimum visual acuity of 0.5 to recognize the contents or information of traffic signs. The method developed in this research has an advantage that can consider a human factor like driver's visual acuity for the design of traffic signs. There is also a meaning of making a basis for the letter size of traffic sign.