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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
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 an Effectiveness Analysis Tool for Freeway Tollgate Entrance Control
Lee, Hwan-Pil ; Yun, Il-Soo ; Oh, Young-Tae ; Kim, Soo-Hee ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 1~12
DOI : 10.12815/kits.2012.11.3.001
This paper aims at developing an active expressway entrance control effectiveness analysis tool which operators can utilize and manage traffic based on current traffic condition. For this, after identifying the current problems of tollgate-based entrance policy being used, a new set of decision element such as congestion index, decision criteria for congestion, and congestion management unit has been proposed together with the procedure of newly developed tollgate control policy. Three key parts developed are traffic condition identification module, tollgate metering module, and travel speed calculation module. Some measures of effectiveness were also identified and the newly developed effectiveness analysis tool produced better result. According to classification of traffic condition by reference speed as 80km/h, the improved tollgate entrance procedure increased 21.5% in average travel speed compared with Do-Nothing case and also increased 8.8% compared with current entrance control method.
Directional Design Hourly Volume Estimation Model for National Highways
Lim, Sung-Han ; Ryu, Seung-Ki ; Byun, Sang-Cheol ; Moon, Hak-Yong ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 13~22
DOI : 10.12815/kits.2012.11.3.013
Estimating directional design hourly volume (DDHV) is an important aspect of traffic or road engineering practice. DDHV on highway without permanent traffic counters (PTCs) is usually determined by the annual average daily traffic (AADT) being multiplied by the ratio of DHV to AADT (K factor) and the directional split ratio (D factor) recommended by Korea highway capacity manual (KHCM). However, about the validity of this method has not been clearly proven. The main intent of this study is to develop more accurate and efficient DDHV estimation models for national highway in Korea. DDHV characteristics are investigated using the data from permanent traffic counters (PTCs) on national highways in Korea. A linear relationship between DDHV and AADT was identified. So DDHV estimation models using AADT were developed. The results show that the proposed models outperform the KHCM method with the mean absolute percentage errors (MAPE).
A Study on a Near-Field Reader Antenna for 900 MHz RFID
Park, Joung-Geun ; Lee, Jong-Chul ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 23~30
DOI : 10.12815/kits.2012.11.3.023
In this paper, we propose a new near-field reader antenna for 900 MHz RFID. The proposed antenna consists the micro-strip antenna with the periodic structure. The overall dimension of the antenna is
. The antenna has the uniform E-field distribution in near field region and the heart-shaped radiation beam pattern (Peak gain=-2 dBi). The transmitted power range is from 17 dBm to 23 dBm. We focus on minimizing the detected error by suppressing the reflected power from the metal, which is attached to the surface by tag, and by reducing the transmitted power from tag.
Energy-aware Source Routing Protocol for Lifetime Maximization in Mobile Ad Hoc Networks
Choi, Hyun-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 31~39
DOI : 10.12815/kits.2012.11.3.031
In this paper, we propose an energy-aware source routing protocol for maximizing a network lifetime in mobile ad hoc network environments. The proposed routing protocol is based on the source routing and chooses a path that maximize the path lifetime, by considering both transmit/receive power consumption and residual battery power in the mobile nodes from the perspective of source-destination end-to-end. This paper proposes a new routing cost and designs a new routing protocol for minimizing the control packet overhead occurred during the route discovery. Simulation results show that the proposed scheme has similar performances to the conventional routing schemes in terms of the number of transmission hops, transmission rate and total energy consumption, but achieves the performance improvement of 20 percent with respect to the lifetime.
Outage Performance of Partial Relay Selection in Dual-Hop Decode-and-Forward Relaying Systems
Lee, In-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 40~47
DOI : 10.12815/kits.2012.11.3.040
In dual-hop relaying systems, the conventional partial relay selection is based on the channel information only for the first hop. On the other hand, the efficient partial relay selection is based on the channel information for the hop with the minimum of the average channel powers for the first and second hops at each end-to-end link since the correlation coefficient between the end-to-end link quality and the link quality of the hop with the minimum of the average channel powers for the first and second hops is larger than that between the end-to-end link quality and the link quality of the other hop. In this paper, the outage probability of the conventional partial relay selection and the efficient partial relay selection in dual-hop decode-and-forward relaying systems is analyzed for non-identically distributed Rayleigh fading channels. Through numerical investigation, the outage performance of the efficient partial relay selection is compared with the outage performances of the conventional partial relay selection and the best relay selection based on all the channel information for the first and second hops.
VoIP Receiver Structure for Enhancing Speech Quality Based on Telematics
Kim, Hyoung-Gook ; Seo, Kwang-Duk ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 48~54
DOI : 10.12815/kits.2012.11.3.048
The quality of real-time voice communication over Internet Protocol networks based on telematics is affected by network impairments such as delays, jitters, and packet loss. To resolve this issue, this paper proposes a receiver-based enhancing method of VoIP speech quality. The proposed method enables users to deliver high-quality voice using playout control and signal reconstruction, which consists of concealment of lost packets, adaptive playout-buffer scheduling using active jitter estimation, and smooth interpolation between two signals in a transition region. The proposed algorithm achieves higher Perceptual Evaluation of Speech Quality (PESQ) values and low buffering delay than the reference algorithm.
Image Compression with using Wavelet Conversion Coefficients of Zerotree
Seo, Han-Seog ; Park, Se-Won ; Yim, Hwa-Young ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 55~62
DOI : 10.12815/kits.2012.11.3.055
EZW, also known as Embedded Zerotree Wavelet, is a technique that allows transforming original images into wavelet, then again compressing images using the transformed data. This algorithm demonstrates a simple structure and remarkable effectiveness. This paper has reformed the EZW to improve a compression efficiency. Fundamentally, EZW evaluates the priority level of wavelet-transformed data and stores them into four different categories considering the priority level of the data as well as their location information. The four categories are represented as the symbols P, N, Z, and T. Here, P and N correspond to the volume of data and the priority level whereas Z and T show the location information of data. Each letter is stored through the process of dominant pass. However, here is when the data of Z and T are stored redundantly which lead to unnecessary increase of data volume. In this paper, we propose a modified version of Embedded Zerotree Wavelet algorithm, which is designed to efficiently reduce the volume of redundantly stored data using four additionally inserted symbols. We name it EEZW, Extended Embedded Zerotree Wavelet. The proposed algorithm demonstrates the efficiency verified by a number of image and confirms an outstanding result through the PSNR(Peak Signal To Noise Rate) values, which measure their quality of images.
Required Video Analytics and Event Processing Scenario at Large Scale Urban Transit Surveillance System
Park, Kwang-Young ; Park, Goo-Man ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 63~69
DOI : 10.12815/kits.2012.11.3.063
In this paper, we introduced design of intelligent surveillance camera system and typical event processing scenario for urban transit. To analyze video, we studied events that frequently occur in surveillance camera system. Event processing scenario is designed for seven representative situations(designated area intrusion, object abandon, object removal in designated area, object tracking, loitering and congestion measurement) in urban transit. Our system is optimized for low hardware complexity, real time processing and scenario dependent solution.
A Study of Stable Route Decision Based on VANET Routing Protocol in Urban Environment
Ham, Woo-Hyung ; Jang, Sang-Woo ; Lee, Sang-Sun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 70~80
DOI : 10.12815/kits.2012.11.3.070
In Vehicular Ad-hoc Network(VANET) which constructs networks without fixed infrastructure among vehicles, network topology is frequently changed due to high mobility. In case of urban model, communication disconnections caused by interruptions of communication propagation such as buildings and constructions could be often occurred. Therefore, in VANET environment a routing protocol to complement its characteristics is needed. This paper suggests an algorithm to improve the transmission performance at intersections by approaching of the distance-based broadcasting which utilizes the information of vehicle's position. By using relative velocity among vehicles, it makes the stability of route decision improved and reduces packet collisions through graded priorities in the intersection, and simultaneously improves the performance of data rate. It can be seen that the performance compared with previous algorithm is significantly improved when using the suggested algorithm in the urban traffic environment.
Demand Forecasts Analysis of Electric Vehicles for Apartment in 2020
Byun, Wan-Hee ; Lee, Ki-Hong ; Lee, Sang-Hyuk ; Kee, Ho-Young ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 81~91
DOI : 10.12815/kits.2012.11.3.081
The world has been replacing fast fossil fuels vehicles with electric vehicles(EVs) to cope with climate change. The government set a goal which EVs will be substitute at least 10% of the domestic small vehicles with EVs until 2020, and will try to build electric charging infrastructures in apartments with the revision the law of 'the housing construction standards'. In apartments the EVs charging infrastructure and parking space is, essential to accomplish the goal. But the studies on EVs demand are few. In this study, we predicted that the demand for EVs using time-series analysis of statistical data, survey results for apartments residents in the metropolitan area. As a result, the ratio of the EVs appeared to be 6~21% for the total vehicles in a rental apartments for the years 2020, 21~39% in apartments for sales. For the EVs, the maximum power required for 1,000 households in rental apartment is predicted to be about 4200 kwh on a daily basis, while the maximum power in the apartment for sales is predicted to be 7800kwh.
Analysing Weekend Travel Characteristics in Seoul
Choo, Sang-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 92~101
DOI : 10.12815/kits.2012.11.3.092
Trip demands and patterns on weekends have been changed significantly over the past decade due to the income growth and the spread of the 5-day workweek in Korea. The increased weekend trips for shopping, leisure activities, entertainment and friendship have exacerbated traffic congestion in major highways or principal arterial roads from Friday afternoon through Sunday. Therefore, it is necessary to focus on travel demand forecasts and transport policies for weekend trips by investigating specific characteristics of the trips. Previous research efforts focus on simple analysis of characteristics of weekend trips and comparison of travel characteristics between weekdays and weekends. The paper analyzes the differences between weekday and weekend trips via statistical analyses to derive multiple types of characteristics of weekend trips, and develops Tobit models to identify key factors that may affect the number of trips, using Seoul city's weekend trip survey data in 2006. The model results show that weekend trips appear differently from weekdays by household or individual characteristics. Age, residence area and type of residence affected the number of trips, regardless of the type of the day, whereas gender, occupation, income, presence of household vehicle showed different impacts on trips between weekdays and weekends.
The Analysis of Factors affecting Expressway Accident Involving Human Injuries using Logit Model
Seo, Im-Ki ; Lee, Ki-Young ; Lee, Seong-Kwan ; Park, Je-Jin ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 102~111
DOI : 10.12815/kits.2012.11.3.102
Expresway traffic accident is fatal accident by high speed, especially human injury is a great social issue. This paper aims to identify characteristic differences of highway accidents that involve human injuries or not. To analysis the elements that affect the two types of accidents used the logistic regression model. The analysis showed that human injury accident rate is increased in case of straight road, flat, or cut-slope areas, barriers, male driver, and older driver. These results provide the ground for actions to counter the problems. By discovering factors for accidents leading to fatality, this study can provide important implications for authorities that establish highway safety measures and policies in preventing human injuries or deaths from car accidents.
Drivers' Workloads through the Driving Vehicle Test at Intersections
Seo, Im-Ki ; Park, Je-Jin ; Sung, Soo-Lyeon ; NamGung, Moon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 112~123
DOI : 10.12815/kits.2012.11.3.112
Different from general roads, intersections are the points where roads having different geometric structure and traffic operation system are met, and thereby they have complicated road structure and environmental factors. Various changes in driving patterns such as collision between vehicles approaching from roads adjacent to intersections, sudden stop of vehicles upon stop sign, quick start upon green lights kept increasing traffic accidents. It is known that traffic accidents are mainly derived from human factors. This study, in order to find out factors affecting drivers' behaviors within intersections, measured physiological responses such as brain wave, sight, driving speed, and so on by using state-of-the-art measuring device. As to concentration brain wave at individual intersections, it was found out that brain wave of testes was higher at main Arterial and accident-prone intersections compared with that of subsidiary Arterial. In addition, it was detected that drivers' visual activity was widely distributed at accident-prone intersections, meaning that it enhanced cautious driving from nearby vehicles. As to major factors causing drivers' workloads, factors from nearby vehicles such as deceleration, acceleration, lane change of nearby vehicles appeared as direct factors causing drivers' workloads, clarifying that these factors were closely related to causes of traffic accidents at intersections. Results of this study are expected to be used as basic data for evaluation of safety at intersections in consideration of physiological response of drivers.
An Analysis of Effects of Travel Speed Using the Safety Facilities in the School Zones
Lee, Ho-Won ; Joo, Doo-Hwan ; Hyun, Cheol-Seung ; Kim, Dong-Hyo ; Park, Boo-Hee ; Lee, Choul-Ki ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 11, issue 3, 2012, Pages 124~132
DOI : 10.12815/kits.2012.11.3.124
There is high probability of children's traffic accidents. Because their physical, mental attribute are weak. Major part of the accidents happen during walking. Above all, jaywalking is the biggest traffic accident reason. Many traffic accidents take place on the road to school or near the home area. So Ministry of Public Administration and Security legislated children safeguard zone since 1995. But a study are inadequate the safety facilities on the effectiveness verification in the school zone. Therefore, this study aims to analyze the effectiveness of safety facilities. The vehicle speed is a direct correlation traffic accident. So in this study, the MOE(Measure of Effectiveness) is average travel speed in the school zone. The results shows that hump, rised pedestrian crossing has an effect.