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 8, Issue 6 - Dec 2009
Volume 8, Issue 5 - Oct 2009
Volume 8, Issue 4 - Aug 2009
Volume 8, Issue 3 - Jun 2009
Volume 8, Issue 2 - Apr 2009
Volume 8, Issue 1 - Feb 2009
Selecting the target year
System Dynamics Interpretation on Bus Scheduling Model
Kim, Kyeong-Sik ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 1~8
This paper aims mainly to reinterpretate Optimal Bus Scheduling Model by applying System Dynamics Perspective. Traditionally, the study regarding Optimal Bus Scheduling Model stems on the linear relationshp. However, this paper attempted to convert linear relationship based Optimal Bus Scheduling Model to causal loop perspective based Model. In result, the paper present Casual Loop Diagram for Optimal Bus Scheduling Model. Furthermore, the paper also ran a simulation based on Stock & Flow Diagram for Optimal Bus Scheduling Model. The outcome was not much different from the linear relationship based Model due to the similarity of the equation applied on two models.
Evaluation of Technical Feasibility for Vehicle Classification Using Inductive Loop Detectors on Freeways
Park, Joon-Hyeong ; Kim, Tae-Jin ; Oh, Cheol ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 9~21
This study presents a useful heuristic algorithm to classify vehicle classes using vehicle length information, which is extracted from inductive loop vehicle signatures. A high-speed scanning equipment was used to extract more detailed change of inductance magnitude for individual vehicles. Vehicle detection time and individual vehicle speeds were used to derive vehicle length information that is an input of the proposed algorithm. The spatial and temporal transferability tests were further conducted to evaluate algorithm. The spatial and temporal transferability tests were further conducted to evaluate algorithm performance more systematically. It is expected that the proposed method would be useful for obtaining vehicle classification information from wide-spread existing loop infrastructure.
Development of a Traffic Accident Investigation Device Using PDA Technology
Lee, Sang-Soo ; Oh, Young-Tae ; Lee, Choul-Ki ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 22~29
This paper suggests a PDA-based scientific traffic accident investigation system in order to improve the reliability and accuracy of a traffic accident investigation procedure. In order to fulfill this objective, a standard accident sheet with 32 elements to be used in the PDA system was developed through a reference review and an expert survey. Using this information, the required functionalities and realization procedure of the PDA system for traffic accident investigation were presented including mobile network environment and GPS/GIS design. A prototype of PDA system is presented and more improved and efficientmanagement is highly expected by applying the system developed in this paper.
Coverage Extension of the Highway Dedicated Short Range Communication System based on a Fixed Relay
Choi, Kwang-Joo ; Kim, Hak-Jae ; Park, Sang-Kyu ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 30~36
Dedicated Short Range Communication (DSRC) systems in urban areas are used to collect traffic information from vehicles and to provide vehicles with information received from Roadside Equipment (RSE) having a range of 100 meters (m). However, it is not practical to use RSE with a range of 100 m for express highways. In this paper, we expand the standard cell coverage of RSE to 300 m, and adopt fixed relays to cover sites that cannot communicate with the RSE. We demonstrate that the system using the fixed relays is more economical than using only RSE.
Density Measurement for Continuous Flow Segment Using Two Point Detectors
Kim, Min-Sung ; Eom, Ki-Jong ; Lee, Chung-Won ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 37~44
Density is the most important congestion indicator among the three fundamental flow variables, flow, speed and density. Measuring density in the field has two different ways, direct and indirect. Taking photos with wide views is one of direct ways, which is not widely used because of its cost and lacking of proper positions. Another direct density measuring method using two spot detectors has been introduced with the concept of instantaneous density, average density and measurement interval. The relationship between accuracy and measurement interval has been investigated using the simulation data produced by Paramics API function. Finally, density measurement algorithm has been suggested including exponential smoothing for device development.
Design of a 5.8 GHz Rectenna Using Dipole Antenna
Oh, Kyoung-Min ; Lee, Hyun-Wook ; Nam, Hee ; Hong, Tae-Ui ; Lee, Dae-Sung ; Hwang, Hak-In ; Lee, Jong-Chul ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 45~52
In this paper, a new rectenna is presented for the wireless transmission of microwave power using dipole antenna (Quasi Yagi effect) and rectifier of CPS resonator structure. The dipole antenna with CPW feedline has high peak gain than a general dipole antenna. A ground plane of CPW is used to reflect a dipole as a Yagi antenna. Therefore, the new rectenna receives the RF power better than the one using general dipole. A RF-to-DC conversion efficiency of 61 % using a 1.4
load resistor is obtained at 5.8 GHz.
Link Budget and Performance Analysis of UWB Transmission Method for Off-body HDR Communication in WBAN System
Choi, Nack-Hyun ; Hwang, Jae-Ho ; Jang, Sung-Jeen ; Kim, Jae-Moung ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 53~64
For a realization of the ubiquitous society, applying IT to vehicle industry has recently been an attractive issue to make wireless communication in body area network possible to everywhere. In this paper, we propose the physical layer symbol structure based on PPM scheme of the IEEE 802.15.4a for the off-body high data rate WBAN system. We propose four symbol structures which is classified according to the number of the chip and whether the channel coding is used or not. We calculate the required SNR through the link budget calculation and the recently proposed off-body WBAN channel environment was applied in the simulation. The results of four systems show that small number of burst's chip enhances the performance and the system is capable to achieve the data rate of 10 Mbps.
Efficient Method for Improving Data Accessibility in VANET
Shim, Kyu-Sun ; Lee, Myong-Soo ; Lee, Sang-Keun ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 65~75
A Vehicular Ad-Hoc Network (VANET) is a form of Mobile ad-hoc network, to provide temporary communications among nearby vehicles. Mobile node of VANET consumes energy and resource with participating in the member of network. Some node tends to have a selfishness to place one's own profits above cooperation with others. As result of selfish node, it reduces data accessibility and the efficiency of networks. In this paper, we propose noble method, Friendship-VaR that excludes selfish nodes from a group of VANET. Friendship-VaR enables to improve data accessibility by eliminating selfish nodes and sharing data among reliable nodes. Friendship-VaR determines selfishness of nodes by simple data exchange. The experiments shows proposed method outperform existing method in terms of data accessibility.
Efficient TCP/IP Transmission Technology in Wireless Sensor Network for ITS Applications
Oh, Jong-Taek ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 76~81
The transmitting node in WSN for ITS would be small and operated by battery, and the MCU in the node would be low speed with small sized memory and low power consumption. In this paper, the post-checksum method in which the checksum field is added to the tail of the TCP segment for ITS applications, is proposed to reduce data processing time and power consumption, and so there is no limitation of the transmitting data size.
A Joint Resource Allocation and Routing Scheme for the IEEE 802.16j Multi-hop Relay Networks
Lee, Kyung-Joo ; Lee, Hyuk-Joon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 82~91
Routing (or path selection) is one of the key issues of multi-hop relay networks such as the IEEE 802.16j. Moreover, the allocation of appropriate resource such as bandwidth should not only be made in accordance with the paths selected, but the utilization of radio resource of an entire cell should also be maximized. Due to this interdependency between the problems of resource allocation and routing, it is desired these two problems are addressed simultaneously. In this paper, we propose a joint resource allocation and routing scheme for an OFDMA-based multi-hop cellular system. This scheme uses a polynomial time heuristic algorithm called Multi-Dimensional Multi-choice Knapsack Problem (MMKP) in order to find an approximate solution maximizing the total downlink throughput. In the simulation results, we show that the proposed scheme finds a sub-optimal solution which is superior to a link quality-based routing scheme, but slightly worse than the optimal solution.
Bandwidth Provisioning Using ARIMA-Based Traffic Forecasting in IEEE 802.16e Networks
Kim, Hyun-Woo ; Lee, Jun-Hui ; Choi, Yong-Hoon ; Chung, Young-Uk ; Lee, Hyun-Joon ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 92~101
In this paper, we propose a dynamic bandwidth provisioning method based on traffic forecasting in IEEE 802.16e packet core network. The traffic is categorized as 4-different classes and the traffic amount of each class is forecasted by the Box-Jenkins method. To increase the service provider's revenue we provision the bandwidth of 4-different classes dynamically using greedy algorithm. The simulation results show that the number of packet drops is reduced and the level of QoS is improved compared with two different the methods - no priority considering and static provisioning.
A Study on Performance Improvement of Hybrid TDMA/CSMA MAC Using the Limitive CSMA
Lee, Wang-Jong ; Rhee, Seung-Hyong ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 102~109
This paper proposes the efficient method of CSMA during an idle duration in the time slot. The hybrid TDMA/CSMA protocol is the method that shares the medium efficiently. This improves the channel efficiency and throughput by using CSMA method during the idle TDMA time slot. In CSMA duration, many devices start to compete with each other. This causes a low throughput because of a long delay and a frequent collision. In order to improve this problem, the proposed method reduces the number of devices that compete in the CSMA duration. Because the number of competed device is reduced, this proposed algorithm reduces the delay and collision probability. This decrements of delay and collision probability improve the networks. The simulation results show that the proposed limitive CSMA methods outperform any methods of hybrid TDMA/CSMA protocol.
Research on the PAPR Reduction Method using Selection of Extra Code Set in PB/MC-CDMA System
Lee, Kyu-Jin ; Lee, Dong-Joon ; Lee, Kye-San ; Kim, Jin-Young ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 110~118
The PB/MC-CDMA(Partial Block Multi Carrier Code Division Multilple Access) system can improve the performance by reducing the ICI(Inter-Code Interference) between users. Also, this system can achieve the frequency diversity gain by avoiding ISI(Inter Symbol Interference). Therefore, the performance of PB/MC-CDMA system is better than that of conventional MC-CDMA(Multi Carrier Code Division Multiple Access) system. However, similarly to other multi-carrier systems, it still has a PAPR(Peak to Average Power Ratio) issue. In this paper, we propose a peak power reduction technique involving optimized spreading code selection without side information for the PB/MC-CDMA. The PB/MC-CDMA system in each block of units reuses the code so the extra code will be remained. This extra code is divided into several groups to calculate the PAPR and solving the PAPR problem by transferring the selected code which has minimum peak power.
A Study on a Filtering Method of Recommendation Service System Using User's Context
Han, Dong-Jo ; Park, Dae-Young ; Choi, Ki-Ho ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 119~126
In recent years, many recommendation service systems that search or recommend information automatically considering user's taste or property are developed. However, there is a weak point that correct recommendation is hard without considering the preference of user's context. This paper proposes a filtering method that gives correct recommendation considering the preference of user's context. To support this method, we get UCOP(User-Context Object Preference) using the preference of user's context and Pearson correlation coefficient. The results of the experiment show the improvement of 11%, 2% of precision and 8%, 4% of recall comparing with the existing service systems. Our recommendation service systems show 77% of precision and 53% of recall overall.
Interest Point Detection Using Hough Transform and Invariant Patch Feature for Image Retrieval
Nishat, Ahmad ; An, Young-Eun ; Park, Jong-An ;
The Journal of The Korea Institute of Intelligent Transport Systems, volume 8, issue 1, 2009, Pages 127~135
This paper presents a new technique for corner shape based object retrieval from a database. The proposed feature matrix consists of values obtained through a neighborhood operation of detected corners. This results in a significant small size feature matrix compared to the algorithms using color features and thus is computationally very efficient. The corners have been extracted by finding the intersections of the detected lines found using Hough transform. As the affine transformations preserve the co-linearity of points on a line and their intersection properties, the resulting corner features for image retrieval are robust to affine transformations. Furthermore, the corner features are invariant to noise. It is considered that the proposed algorithm will produce good results in combination with other algorithms in a way of incremental verification for similarity.