Go to the main menu
Skip to content
Go to bottom
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
A Study on Standardization of UPS (Uninterruptible Power Supply) for Traffic Signal Controller
Ko, Kwang-Yong ; Lee, Choul-Ki ; Kim, Min-Sung ; Heo, Nak-Won ; Jeong, Jun-Ha ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 1~6
DOI : 10.12815/kits.2012.11.5.001
Unlike the past, modern urban intersections have dramatic growth in size and utilizations. As a result, continual traffic signal control is essential. Hence the individual or regional electrical blackout may bring about uncontrollable traffic congestion. Late summer of 2011 a regional blackout brought about traffic nightmare not including time and revenue loss associated with this disaster. Due to this disaster our national police agency and other government agencies are in process of introducing an UPS (uninterruptible power supply) system into essential intersections. This study estimates the power consumption necessary to sustain at least 2 continuous hours for a standard four-legged intersection. Prototype was studied using these standards. The field experiment of prototype showed positive results and was able to meet standard guidelines set forth. Prototype tested was able to meet standards in medium to large capacity of traffic size.
A Study on Development of Systems to Enforce the interfering Cars on the Ramp
Lee, Ho-Won ; Hyun, Cheol-Seung ; Joo, Doo-Hwan ; Jeong, Jun-Ha ; Lee, Choul-Ki ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 7~14
DOI : 10.12815/kits.2012.11.5.007
We frequently confront with cars interfering into our lane on the ramp. We suffered from serious traffic congestion due to the interfering cars. But the police enforcement has not done actively because it's hard to enforce. In this study, we have evaluated the systems to enforce cutting-in cars through the field test. Generally, the image processing method depends on the weather. To overcome this limitation we proposed a new algorithm combined with section detection method. In the filed test we concluded the results as follows. Whereas the violation detection rate of the general image processing was 58.2%, a new algorithm proposed by this study was 74.5%. And, an error rate enforcing vehicles that do not violate was 0.0%. Also, we can use the existing facilities, such as street light because of compact and lightweight systems which are integrated camera with controller. Therefore, we concluded that it is possible to enforce the interfering Cars using vehicle enforcement systems.
Evaluation of Mobility and Safety of Operating an Overlap Phase on a Shared-Left-Turn Lane Using a Microscopic Traffic Simulation Model
Yun, Il-Soo ; Han, Eum ; Woo, Seok-Cheol ; Yoon, Jung-Eun ; Park, Sung-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 15~26
DOI : 10.12815/kits.2012.11.5.015
Government agencies including the national police agency have executed diverse efforts including continuous improvements of traffic facilities and operation methods, education, enforcements in order to improve traffic operation systems; nevertheless there have been continuous criticisms on irrationality in traffic signal and road facility operation. One of the reasons may be the lack of systematic preliminary evaluations on various alternatives. However, there was no appropriate tool to evaluate the mobility and safety of thus alternatives in a systematic way. Therefore, this study proposes the systematic use of microscopic traffic simulation models as a comprehensive evaluation tool. In addition, this study verified the potential of using a microscopic traffic simulation model using the case of operating an overlap phase on a shared-left-turn lane through a systematic way where the evaluation was conducted through data collection, building networks, calibrating microscopic simulation models, producing performance measures, evaluating mobility and safety, and so on. As a result, the operation of overlap phase on a shared-left-turn lane showed no big difference from other operation scenarios such as leading left-turn on exclusive left turn lane in terms of mobility. However the operation of overlap phase on a shared-left-turn lane decreased safety by increasing potential conflicts.
Applicability of Emergency Preemption Signal Control under UTIS
Park, Soon-Yong ; Kim, Dong-Nyong ; Kim, Myung-Soo ; Lee, Jung-Beom ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 27~37
DOI : 10.12815/kits.2012.11.5.027
Even thought the firefighters have to hurry to the scene to extinguish the blaze, the fire engines could not rushed out due to the worst of traffic condition. Traffic signal control is one of the most important methods to minimize the fire engines's travel time. The focus of this paper is to develop a traffic control strategy, which is emergency vehicle preemption algorithm considering pedestrian in order to reduce travel time of emergency vehicle. This algorithm also includes recovering strategy after preemption signal to minimize the other vehicle's delay. In order to estimate the effectiveness of traffic control, traffic simulation was performed using VISSIM micro simulation tool for two different kinds of networks, which were non-coordinated corridor and coordinated corridor. The differences of travel time and average delay between emergency vehicle and ordinary vehicle were respectively estimated under pre-existed pretimed signal and preemption traffic control at two respective networks. The results of the simulation for the emergency vehicle, travel time was reduced to 36.8~43.3% under "Add or Subtract" method whereas it was reduced to 30.7~46.0% under "Dwell" method. In addition, in non-coordinated corridor case of ordinary vehicle, average control delay of "Dwell" method was increased 33.5% whereas it grew 0.5% under coordinated corridor. And "Add or Subtract" method was confirmed that average control delay of ordinary vehicle was increased 0.7% under non-coordinated corridor whereas it swelled 4.5% under coordinated corridor.
Development of One-to-One Shortest Path Algorithm Based on Link Flow Speeds on Urban Networks
Kim, Taehyeong ; Kim, Taehyung ; Park, Bum-Jin ; Kim, Hyoungsoo ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 38~45
DOI : 10.12815/kits.2012.11.5.038
Finding shortest paths on time dependent networks is an important task for scheduling and routing plan and real-time navigation system in ITS. In this research, one-to-one time dependent shortest path algorithms based on link flow speeds on urban networks are proposed. For this work, first we select three general shortest path algorithms such as Graph growth algorithm with two queues, Dijkstra's algorithm with approximate buckets and Dijkstra's algorithm with double buckets. These algorithms were developed to compute shortest distance paths from one node to all nodes in a network and have proven to be fast and efficient algorithms in real networks. These algorithms are extended to compute a time dependent shortest path from an origin node to a destination node in real urban networks. Three extended algorithms are implemented on a data set from real urban networks to test and evaluate three algorithms. A data set consists of 4 urban street networks for Anaheim, CA, Baltimore, MD, Chicago, IL, and Philadelphia, PA. Based on the computational results, among the three algorithms for TDSP, the extended Dijkstra's algorithm with double buckets is recommended to solve one-to-one time dependent shortest path for urban street networks.
Estimation of Willingness to pay for Realtime Route Guidance Information by Contingent Valuation Method
Do, Myung-Sik ; Kim, Yoon-Sik ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 46~55
DOI : 10.12815/kits.2012.11.5.046
This study proposes an estimate method of willingness to pay(WTP) for real-time route guidance systems using contingent valuation method(CVM) under double bounded dichotomous choice question(DBDCQ) and analysis for impact factors of WTP estimation. This study assumed that provided real-time traffic information service is optimal route concepts dealing with traffic conditions on origin-destination. Analysis targets were classified into two groups as short distance path and middle distance path for estimating WTP for realtime route guidance system in a year using the survival analysis method and the regression model with personal information, actual condition and satisfaction of information usage and users' awareness and usage of facilities. As a result, mean WTP of realtime route guidance system is 4,034won/year in short distance path, and 4,884won/year in middle distance path. Therefore real-time route guidance system for longer distance path is recognized as more valuable than shorter distance path. Moreover, the necessity of information was required on a higher income group and higher WTP was estimated on owners of vehicle group and lower awareness of a route group.
Multiple Interactive Visualization Techniques for Information
Kang, Sang-Goo ; Nam, Doohee ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 56~61
DOI : 10.12815/kits.2012.11.5.056
Several Visualization techniques have been applied in traffic information area. This work is the basic research for applying of interactive visualization techniques when the traffic information is provided to users. Design of interactive visualization techniques were applied to traffic information services. Previous studies for information visualization with interactive visualization techniques were investigated, and the traffic information services currently provided were analyzed. There are many types of interactive visualization techniques, but this study is mainly focused on selecting, querying, linking, filtering and rearranging techniques. The users can obtain the proper and more suitable information for theie needs, because each interactive visualization techniques support interaction between information and users. The traffic information which has one of interactive techniques can be more effective for decision making and utilization. More attention is given to interactive visualization of data and information techniques in transportation field. By this research, it is expected that traffic information services is more effective and can be a foundation work for various interactive visualization techniques in traffice inforamtion.
A Traffic Simulation Model Verification Method Using GPS Equipment
Hu, Hyejung ; Baek, Jongdae ; Han, Sangjin ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 62~69
DOI : 10.12815/kits.2012.11.5.062
Traffic simulation models have been used for assessing various transportation strategies. Through comparing results from a simulation model and real field data, researchers try to show how close the model can reproduce the real world traffic. This model verification step is one of the most essential tasks in modeling procedure. Traffic counts and speeds have been frequently used for the verification or validation. Authors modeled severe PM peak bottleneck situation on the I-40 corridor in Raleigh, North Carolina using DYNASMART-P, a mesoscopic traffic simulation tool and verified the model. NCDOT has Traffic Information Management System which has archive capability for the traffic speeds on the I-40 corridor. However, the authors selected travel time as the field measure for model verification and collected the data using a GPS equipment because the speed data from NCDOT speed detectors are spot speeds which are not appropriate for comparison with link average speed from the simulation model. This paper describes the GPS field data collection procedure, the model verification method, and the results.
A Study for Solving Multi-Depot Dial-a-Ride Problem Considering Soft Time Window
Kim, Taehyeong ; Park, Bum-Jin ; Kang, Weon-Eui ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 70~77
DOI : 10.12815/kits.2012.11.5.070
Dial-a-ride is the most widely available transit service for disabled persons or seniors in the United States and Europe. This paper studies a static dial-a-ride problem considering multiple depots, heterogeneous vehicles, and soft time windows. In this paper, we apply a heuristic based on clustering first-routing second(HCR) to a real-world large dial-a-ride problem from Maryland Transit Administration(MTA). MTA's real operation is compared with the results of developed heuristic for 24 cases. The objective function of the proposed model is to minimize the total cost composed of the service provider's cost and the customers' inconvenience cost. For the comparison, the objective function values of HCR do not include waiting cost, delay cost, and excess ride cost. The objective function values from HCR are better than those from MTA's operation for all cases. This result shows that our heuristic method can make the real operation better and more efficient.
A Study on Reliability Improvement of Traffic Information by Integrating Security and Traffic AVI Data
Park, Han-Young ; Kim, Gyeong-Seok ; Kang, So-Jeong ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 78~88
DOI : 10.12815/kits.2012.11.5.078
AVIs on the road are installed for (1) security (2) and for traffic, and they are various managed by (1) police department, (2) local government, (3) national highway management, (4) Korean highway corporation. But although the collected data of the plate number, the travel time, the picture of the car are same, they are used in purposes of its installation because the managements are different and the data are difficult to be connected with each other. For this reason, this study is to appraise the application for creating traffic information by integrating these data, and to suggest the introduction of spatial detection system which integrated security-traffic AVI DB for the purpose of reliability improvement of center's velocity. The estimating sections of link travel information seems to be expanded, and the error rate between the center's velocity and the experimental value will be reduced if integrated DB of traffic and security AVIs is used for creating traffic information. Also, the crime prevention and arrest rate is expected to rise in the future.
Design of a Low Phase Noise Oscillator Using an Interdigital Hairpin Resonator for UTIS
Jung, Tae-Sung ; Lee, Hyun-Wook ; Kwon, Sung-Su ; Lee, Myung-Gil ; Lee, Jong-Chul ; Yoon, Ki-Cheol ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 89~96
DOI : 10.12815/kits.2012.11.5.089
In this paper, a low phase noise oscillator is designed using an interdigital hairpin resonator for UTIS (Urban Traffic Information Systems). The interdigital hairpin resonator has several characteristics compared with a conventional hairpin resonator, which are 70% size reduction and improvement of harmonic characteristics. In addition, Q (Quality factor) of the interdigital hairpin resonator is about 132, which is suitable for the design of a low phase noise oscillator. The oscillator suggested in this paper shows the output power of 12 dBm and the phase noise characteristic of -100.8 dBc/Hz at 100 kHz offset frequency from the center frequency of 5.75 GHz. The phase noise is improved by about 12 dB compared with a conventional oscillator using an interdigital hairpin resonator.
Analysis of Multi-stage Stepped Impedance Resonator for Application of Multi-band Devices
Yun, Tae-Soon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 97~102
DOI : 10.12815/kits.2012.11.5.097
In this paper, each electrical length and harmonics of the multi-stage SIR are calculated by using the input impedance for the variable application of SIR in the microwave systems. The size reduced ratio of the SIR is slightly reduced as increasing of the number of stage. The impedance ratio between lower and higher impedance of the SIR has the dominant effect on the size reduced ratio and harmonic characteristics. Also the equivalent impedance of the SIR is a geometric mean between lower and higher impedance and the quality factor of the SIR is similar to the half-wavelength resonator's.
Design and Performance Evaluation of IR-UWB Tapered Slot Antenna for Optimum Impulse Radio Radiation
Kim, Jong-Min ; Koh, Young-Mok ; Ra, Keuk-Whan ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 103~115
DOI : 10.12815/kits.2012.11.5.103
In this paper, design and performance evaluation of Tapered Slot Antenna for IR-UWB which propagates impulse radio is performed. TSA which has directional characteristic in UWB band should have low radiation loss and minimized impulse radiation distortion. In order to achieve these objectives, the paper designed wide band Impedance transformer and microstrip-slotline transit region structured TSA feeder line. By using the fabricated TSA, the radiation pattern was measured in the radio anechoic chamber. Pulse fidelity and distortion equation was induced to evaluate time domain characteristics according to the impulse radiation. Pulse fidelity of Impulse radiation show favorable results more than 93% within
An Efficient Lighting Control System Design for LSDM Control on AVR
Hong, Sung-Il ; Lin, Chi-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 116~124
DOI : 10.12815/kits.2012.11.5.116
In this paper, we propose an efficient lighting control system design for AVR based LSDM control. This paper, an efficient lighting control system design for LSDM control be design divided as the signal control part for I/O data bus and the timer/counter part for clock signal control according to operating conditions. LSDM control logic be optimization to PORTx and DDRx register by specifying the logical value of each bit for effective control signal processing. And, the LSDM control signal by lighting control program execution of ATmega128 be designed to be LSDM lighting control by control logic operating. In this paper, a proposed lighting control system were measured to power loss rate to proved the power loss reduction about lighting status of LSDM control logic by download the lighting control program to system through serial from host PC. As a measurement result, a proposed lighting control system than the existing lighting control system were proved to be effective to the overall power consumption reduction.
Development of Vehicle and/or Obstacle Detection System using Heterogenous Sensors
Jang, Jeong-Ah ; Lee, Giroung ; Kwak, Dong-Yong ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 125~135
DOI : 10.12815/kits.2012.11.5.125
This paper proposes the new object detection system with two laser-scanners and a camera for classifying the objects and predicting the location of objects on road street. This detection system could be applied the new C-ITS service such as ADAS(Advanced Driver Assist System) or (semi-)automatic vehicle guidance services using object's types and precise position. This study describes the some examples in other countries and feasibility of object detection system based on a camera and two laser-scanners. This study has developed the heterogenous sensor's fusion method and shows the results of implementation at road environments. As a results, object detection system at roadside infrastructure is a useful method that aims at reliable classification and positioning of road objects, such as a vehicle, a pedestrian, and obstacles in a street. The algorithm of this paper is performed at ideal condition, so it need to implement at various condition such as light brightness and weather condition. This paper should help better object detection and development of new methods at improved C-ITS environment.
Technology Development for Improving Animation Performance Based on Train Route Patterns
Lee, Duk-Hee ; Yang, Won-Mo ; Kim, Yong-Il ; Yang, Yun-Hee ; Shin, Yong-Tae ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 5, 2012, Pages 136~146
DOI : 10.12815/kits.2012.11.5.136
As information technology used for simulation and virtual reality developed, there is a growing interest in animation technologies which will effectively deliver simulation results to users. Various efforts have been made to improve animation performance, like playback quality and speed, input-output speed and storage space reduction. However, earlier studies generally focused on image compression frame by frame. To significantly improve storage space and playback speed, animation data should be vectorized. Also, spatial and temporal duplication have to be removed. In this study, animation data structure was improved fundamentally through establishment of hierarchy and vectorization. Also Spatial and temporal duplication of animation data was removed through vectorization based on train route. As a result, storage space was reduced, input-output speed and playback speed were considerably improved. According to the test, additional Patternization which followed vectorization brought reduction of over 80% in storage space and input-output speed was quadrupled. Patternization technology can be used as a proper storage method of animation data, and can provide user-specific animation by small data transmission.