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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 14, Issue 6 - Dec 2015
Volume 14, Issue 5 - Oct 2015
Volume 14, Issue 4 - Aug 2015
Volume 14, Issue 3 - Jun 2015
Volume 14, Issue 2 - Apr 2015
Volume 14, Issue 1 - Feb 2015
Selecting the target year
A Study on the Application of Measures of Travel Time Variability by Analysis of Travel Time Distribution According to Weather Factor
Kim, Jun-Won ; Kim, Young-Chan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 1~13
DOI : 10.12815/kits.2015.14.6.001
Travellers consider extra travel time to be arriving their destination because of uncertainty of travel. So it is important to make predictable highway by providing information of travel time variability to traveller so as to enhance level of service at highway. In order to make predictable highway, it is necessary to develope measures of travel time variability that travellers can easily understand. Recently advanced country including the United States, travel time variability index are actively studied. In earlier study, 95percentile of travel time is considered to be most important calculation index of travel time variability. In this study, is has focused on the propriety analysis of 95percentile of travel time in domestic transportation environment. Result of analysis, All of measures(80percentile of travel time, 90percentile of travel time, 95percentile of travel time) show the tendency to increase when case of weather factor occur compare to normal condition under LOS A~D. Especially 95percentile of travel time increased sensitively.
Development of Optimized Driving Model for decreasing Fuel Consumption in the Longitudinal Highway Section
Choi, Ji-eun ; Bae, Sang-hoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 14~20
DOI : 10.12815/kits.2015.14.6.014
The Korea ministry of land, infrastructure and transport set the goal of cutting greenhouse gas emissions from the transport sector by 34.3% relative to the business as usual scenario by 2020. In order to achieve this goal, support is being given to education and information regarding eco-driving. As a practical measure, however, a vehicle control strategy for decreasing fuel consumptions and emissions is necessary. Therefore, this paper presents an optimized driving model in order to decrease fuel consumption. Scenarios were established by driving mode. The speed profile for each scenario applied to Comprehensive Modal Emission Model and then each fuel consumption was estimated. Scenarios and speed variation with the least fuel consumption were derived by comparing the fuel consumptions of scenarios. The optimized driving model was developed by the derived the results. The speed profiles of general driver were collected by field test. The speed profile of the developed model and the speed profile of general driver were compared and then fuel consumptions for each speed profile were analyzed. The fuel consumptions for optimized driving were decreased by an average of 11.8%.
Impacts of Automated Vehicles on Freeway Traffic-flow - Focused on Seoul-Singal Basic Sections of GyeongBu Freeway -
Park, In-seon ; Lee, Jong-deok ; Lee, Jae-yong ; Hwang, Kee-yeon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 21~36
DOI : 10.12815/kits.2015.14.6.021
These days Automated Vehicle(AV) has been receiving attention as a fundamental solution to resolve the various transportation problems and various researches related to the benefits of AV have been done. However, previous researches mainly analyzed the effects in the virtual network. The purpose of this research is to predict and to find out the benefits by introducing the Automated Vehicle to present road traffic system. Thus, the study analyzes the traffic-flow changes of Gyeongbu freeway Seoul-Singal basic section which is planned for setting the test-bed. The results show that Automated Vehicle can have negative effects on the traffic-flow in low volume of LOS A and B. However, the average speed increases and the traffic density decreases in more than LOS C, the traffic volume increase. Therefore, the introduction of Automated Vehicle achieves positive effect on various transportation problems such as the traffic congestion.
A Pedestrian Network Assignment Model Considering Space Syntax
Lee, Mee Young ; Kim, Jong Hyung ; Kim, Eun Jung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 37~49
DOI : 10.12815/kits.2015.14.6.037
In Space Syntax, the greater the degree of integration between separate links, the greater the links' accessibility from the target network. As such, planning pedestrian walks so that links with high degrees of integration are connected, or else inducing high integration value land use are both valid options. The travel distribution model reflects how walking demand, or more specifically, the pedestrian, partakes in route choosing behavior that minimizes select criteria, notably level of discomfort, as measured using travel distance and time. The model thus demonstrates travel patterns associated with demand pertaining to minimization of discomfort experienced by the pedestrian. This research introduces a method that integrates Space Syntax and the pedestrian travel distribution model. The integrated model will determine whether regions with high degrees of integration are actually being used as pivots for pedestrian demand movement, as well as to explain whether the degree of integration is sustained at an appropriate level while considering actual movement demand. As a means to develop the integrated model, a method that combines display of the visibility of the space syntax network and road-divided links is proposed. The pedestrian travel distribution model also includes an alternative path finding mechanism between origin and destination, which allows for uniform allocation of demand.
Comparative Analysis of Calculation Methods on Willingness to Pay for Introduction of Emergency-call System
Lee, Yoonjung ; Do, Myungsik ; Jang, Taek young ; Han, Daeseok ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 50~59
DOI : 10.12815/kits.2015.14.6.050
This study aimed at suggesting Willingness To Pay (WTP) for introduction of the Traffic Accident emergency Call (TAC) system by using Contingent Valuation Method (CVM) which is a general valuation method. As the method, this study suggested a WTP estimation method of the TAC system with the double-bound dichotomous choice model. In previous studies, the data are processed differently according to the type of questions and analysis models used for the calculation of willingness to pay. Therefore, we re-organized the model by the cases using the truncated data sets, and showed the difference in WTPs. The dataset was developed by more than 500 questionnaire obtained from online and offline survey with the consideration of composition ratio by age group referring housing census in 2010 to mitigate regional bias of samples. At last, this study applied various statistical methods, survival analysis, multiple regression, and Tobit model for better interpretation of the questionnaires.
Considerations on a Transportation Simulation Design Responding to Future Driving
Kim, Hyoungsoo ; Park, Bumjin ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 60~68
DOI : 10.12815/kits.2015.14.6.060
Recent proliferation of advanced technologies such as wireless communication, mobile, sensor technology and so on has caused significant changes in a traffic environment. Human beings, in particular drivers, as well as roads and vehicles were advanced on information, intelligence and automation thanks to those advanced technologies; Intelligent Transport Systems (ITS) and autonomous vehicles are the results of changes in a traffic environment. This study proposed considerations when designing a simulation model for future transportation environments, which are difficult to predict the change by means of advanced technologies. First of all, approximability, flexibility and scalability were defined as a macroscopic concept for a simulation model design. For actual similarity, calibration is one of the most important steps in simulation, and Physical layer and MAC layer should be considered for the implementation of the communication characteristics. Interface, such as API, for inserting the additional models of future traffic environments should be considered. A flexible design based on compatibility is more important rather than a massive structure with inherent many functions. Distributed computing with optimized H/W and S/W together is required for experimental scale. The results of this study are expected to be used to the design of future traffic simulation.
A Study on the Driver's Preferences of Prividing Direction Information in Road Signs
Chong, Kyusoo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 69~76
DOI : 10.12815/kits.2015.14.6.069
Although traffic information has been actively analyzed using big data, it has not been used as much with the consideration of driver characteristics. Among the various types of information, road signs can directly affect the driver. Road signs must provide the optimal information that enables drivers to reach their destinations with ease as well as information suitable for navigation systems. However, present road sign rules provide standardized information, regardless of the road type or size. This study suggests a method for providing road information that will help drivers determine their behavior. First, the minimum character size that can be used on a road sign for each design speed was obtained with respect to the visibility and decipherability of a road sign. Instead of conventional diagram-based direction guidance, a scenario using split-based direction guidance was created. To verify the effectiveness of the provided information, a three-dimensional simulated road environment was constructed, and a driving simulator was used for the test. At a simple plane intersection, the driver was not greatly influenced by directional guidance, but at a complex, three-dimensional intersection, the driver preferred summary-based directional guidance, which is instinctive guidance, over diagram-based guidance. On the basis of the test results, a secondary verification test that applied split-based guidance at a three-dimensional intersection confirmed that the driver had no problems in making decisions.
A Study on Network Based Traffic Signal Optimization Using Traffic Prediction Data
Han, Jeong-hye ; Lee, Seon-Ha ; Cheon, Choon-Keun ; Oh, Tae-ho ; Kim, Eun-Ji ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 77~90
DOI : 10.12815/kits.2015.14.6.077
An increasing number of vehicles is causing various traffic problems such as chronic congestion of highways and air pollution. Local governments have been managing traffic by constructing systems such as Intelligent Transport Systems (ITS) and Advanced Traffic Management Systems (ATMS) to relieve such problems, but construction of an infrastructure-based traffic system is insufficient in resolving chronic traffic problems. A more sophisticated system with enhanced operational management capabilities added to the existing facilities is necessary at this point. As traffic patterns of the urban traffic flow is time-specific due to the different vehicle populations throughout the time of the day, a local network-wide signal operation plan that can manage such situation-specific traffic patterns is deemed to be necessary. Therefore, this study is conducted for the purpose of establishment of a plan for contextual signal control management through signal optimization at the network level after setting the Frame Signal in accordance to the traffic patterns gathered from the short-term traffic forecast data as a means to mitigate the problems with existing standardized signal operations.
A Development of Traffic Accident Model by Random Parameter : Focus on Capital Area and Busan 4-legs Signalized Intersections
Lee, Geun-Hee ; Rho, Jeong-Hyun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 91~99
DOI : 10.12815/kits.2015.14.6.091
This study intends to build a traffic accident predictive model considering road geometrics, traffic and enviromental characteristics and identify the relationship of 4-legs intersection accidents in Seoul and Busan metropolitan area. The RPNB(Random Parameter Negative Binomial) model shows improvement over the fixed NB(Negative Binomial) and out of 53 variables, 10 variables (main road number of lane, main road vehicle traffic volume(left), minor road vehicle traffic volume(right), main road drive restriction, minor road sight distance, minor road median strip, minor road speed limit, minor road speed restriction) showed to have significant variables affecting traffic accident occurrences in 4-legs signilized intersections. Also, among 10 significant variables, 2 variables(minor road sight distance, minor road speed restriction) found to be random parameters.
Exploring Factors Influencing the use of Intercity-bus Services by means of a Structural Equation Model - Focusing on Intercity-bus Users in Chungcheongnam-do Province -
Kim, Wonchul ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 100~109
DOI : 10.12815/kits.2015.14.6.100
The purpose of this study is to explore factors that influence the use of intercity-bus services by means of applying a structural equation model. The data were collected by a questionnaire survey based on personal interviews with intercity-bus users in Chungcheongnam-do province. Analysis results show that environmental attributes of the bus service are more important than operational attributes. In the case of men, the cleanliness of bus stops and the ease of transportation card recharging are likely to be the most crucial factors. However, women are likely to consider the cleanliness of the bus as the most important factor affecting their satisfaction about the intercity-bus service. Moreover, as people's satisfaction about the bus service increases, their willingness to recommend the use of intercity-bus to others will increase. Therefore, to improve the use of intercity-bus and to increase the satisfaction about the service, clean buses must be provided. These results could contribute to developing a policy to activate the use of intercity-bus.
A Low-loss Phase Shifter with Harmonics Suppression Using Compact Hybrid Coupler
Yoon, Ki-Cheol ; Ji, Seung-Han ; Lee, Jong-Chul ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 110~116
DOI : 10.12815/kits.2015.14.6.110
In this paper, a compact low-loss reflector-type phase shifter with harmonic suppression using meander T-shaped branch-line coupler is suggested. The compact coupler for the phase shifter has a size of
while a conventional branch coupler has a size of
. The phase shifter shows insertion losses of 0.19-0.28 dB at the center frequency of 2.1 GHz, and a measured maximum phase shift of
A New CPW Dual Band Wilkinson Power Divider Using Composite Right/Left-Handed Transmission Line
Zhang, Zufu ; Wang, Yang ; Yoon, Ki-Cheol ; Lee, Jong-Chul ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 117~124
DOI : 10.12815/kits.2015.14.6.117
In this paper, a new kind of wideband, low-loss composite right/left-handed (CRLH) transmission line (TL) and a Wilkinson power divider are presented. The TL is composed of a parallel meander inductor and a series cutting capacitor based on coplanar waveguide (CPW) structure. The power divider is designed by substituting the CRLH-TL into the conventional transmission line. The experiment results show that the TL has a good agreement with the desired results, exhibiting the return losses under 12 dB from 8.4 GHz to 34.4 GHz. The operating frequencies of the power divider are 12.05 GHz to 13.15 GHz and 16.50 GHz to 19.30 GHz, respectively. The 20 dB bandwidths are 8.9 % and 17.9 %, respectively. Typical experimental measurements are conducted and compared with the simulated results.
An Event Data Delivery Scheme in GTS-based Wireless Sensor Network
Lee, Kil-hung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 125~132
DOI : 10.12815/kits.2015.14.6.125
This paper presents an event data delivery scheme for wireless sensor networks that use a GTS-based channel allocation scheme. Many sensor nodes can share a GTS channel for sending their normal data to the sink node. When there is an event at a node, the node makes a temporal route to the sink node and the nodes of the route can use the GTS channel in a privileged access. This scheme controls the backoff number effectively so the data delivery priority is given to the nodes of that route. Simulation results show that the event data delivery of the proposed scheme outperforms at the end-to-end transfer delay and jitter characteristics. The proposed scheme can effectively gather the event data using the guaranteed GTS channel of the route in proposed scheme.
A Study on Cooperative-Intelligent Transport System Attack Scenarios and their Prevention and Response Mechanisms
Jang, Yoonsuh ; Lee, Dong-Seob ; Lim, Dong-Ho ; Ahn, So-Hee ; Shin, Jeonghoon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 14, issue 6, 2015, Pages 133~140
DOI : 10.12815/kits.2015.14.6.133
C-ITS is a system that uses bidirectional communication between two vehicles or infrastructures to control traffic more conveniently, and safely. If C-ITS security is not properly prepared, it can cause traffic congestions and fatal traffic accidents, and therefore can affect greatly on the driver's life. This paper proposes the prevention and response mechanisms based on the cyber attack scenarios that can be used to attack C-ITS.