• Title/Summary/Keyword: traffic network

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Network Calibration and Validation of Dynamic Traffic Assignment with Nationwide Freeway Network Data of South Korea (고속도로 TCS 자료를 활용한 동적노선배정의 네트워크 정산과 검증)

  • Jeong, Sang-Mi;Kim, Ik-Ki
    • Journal of Korean Society of Transportation
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    • v.26 no.4
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    • pp.205-215
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    • 2008
  • As static traffic assignment has reached its limitation with ITS policy applications and due to the increase of interest in studies of ITS policies since the late 1980's, dynamic traffic assignment has been considered a tool to overcome such limitations. This study used the Dynameq program, which simulates route choice behavior by macroscopic modeling and dynamic network loading and traffic flow by microscopic modeling in consideration of the feasibility of the analysis of practical traffic policy. The essence of this study is to evaluate the feasibility for analysis in practical transportation policy of using the dynamic traffic assignment technique. The study involves the verification of the values estimated from the dynamic traffic assignment with South Korea's expressway network and dynamic O/D data by comparing results with observed link traffic volumes. This study used dynamic O/D data between each toll booth, which can be accurately obtained from the highway Toll Collection System. Then, as an example of its application, exclusive bus-lane policies were analyzed with the dynamic traffic assignment model while considering hourly variations.

A Slow Portscan Attack Detection and Countermove Mechanism based on Fuzzy Logic (퍼지 로직을 이용한 느린 포트스캔 공격 탐지 및 대응 기법)

  • Kim, Jae-Kwang;Yoon, Kwang-Ho;Lee, Seung-Hoon;Jung, Je-Hee;Lee, Jee-Hyong
    • Journal of the Korean Institute of Intelligent Systems
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    • v.18 no.5
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    • pp.679-684
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    • 2008
  • The slow port scan attack detection is the one of the important topics in the network security. We suggest an abnormal traffic control framework to detect slow port scan attacks using fuzzy rules. The abnormal traffic control framework acts as an intrusion prevention system to suspicious network traffic. It manages traffic with a stepwise policy: first decreasing network bandwidth and then discarding traffic. In this paper, we show that our abnormal traffic control framework effectively detects slow port scan attacks traffic using fuzzy rules and a stepwise policy.

Application of Multi-Agent Transport Simulation for Urban Road Network Operation in Incident Case (유고상황 시 MatSIM을 활용한 도시부 도로네트워크 운영 분석)

  • Kim, Joo-Young;Yu, Yeon-Seung;Lee, Seung-Jae;Hu, Hye-Jung;Sung, Jung-Gon
    • International Journal of Highway Engineering
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    • v.14 no.4
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    • pp.163-173
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    • 2012
  • PURPOSES : The purpose of this study is to check the possibilities of traffic pattern analysis using MatSIM for urban road network operation in incident case. METHODS : One of the stochastic dynamic models is MatSIM. MatSIM is a transportation simulation tool based on stochastic dynamic model and activity based model. It is an open source software developed by IVT, ETH zurich, Switzerland. In MatSIM, various scenario comparison analyses are possible and analyses results are expressed using the visualizer which shows individual vehicle movements and traffic patterns. In this study, trip distribution in 24-hour, traffic volume, and travel speed using MatSIM are similar to those of measured values. Therefore, results of MatSIM are reasonable comparing with measured values. Traffic patterns are changed according to incident from change of individual behavior. RESULTS : The simulation results and the actual measured values are similar. The simulation results show reasonable ranges which can be used for traffic pattern analysis. CONCLUSIONS : The change of traffic pattern including trip distribution, traffic volumes and speeds according to various incident scenarios can be used for traffic control policy decision to provide effective operation of urban road network.

SHANGHAI URBAN GENERAL LAYOUT AND TRAFFIC SYSTEM (론상해기유철로추뉴재성시쾌속유궤교통 로망중적지위화작용)

  • CHANG SHAO LIANG
    • Proceedings of the KOR-KST Conference
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    • 1995.05a
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    • pp.51-59
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    • 1995
  • It is an objective of Shanghai urban development to quickly build Shanghai into one of the international centres of economy, finance and trade. To fulfil the objective, a rational urban general layout and a satisfactory traffic network are needed. As a metropolis with complete urban functions and specified geographical position, Shanghai must develop a perfect citytown system that best suits its composite urban distribution. In planning the central city, the principle of "open and multi-centred" and "optimization of land use" should be taken into consideration. To build a satisfactory urban traffic network, emphasis should be laid upon the construction of deefwater wharf, air-field and inforation centre. In addition, determination should be made to build a high-speed traffic means including high speed railroad and express highway so that a public traffic network is realised on and above ground, and underground. A solution of traffic preblem in Shanghai lies in good understanding of traffic policy and strenthening of strategic management combined with a rational layout of traffic circulation.

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Automatic Payload Signature Update System for the Classification of Dynamically Changing Internet Applications

  • Shim, Kyu-Seok;Goo, Young-Hoon;Lee, Dongcheul;Kim, Myung-Sup
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.13 no.3
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    • pp.1284-1297
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    • 2019
  • The network environment is presently becoming very increased. Accordingly, the study of traffic classification for network management is becoming difficult. Automatic signature extraction system is a hot topic in the field of traffic classification research. However, existing automatic payload signature generation systems suffer problems such as semi-automatic system, generating of disposable signatures, generating of false-positive signatures and signatures are not kept up to date. Therefore, we provide a fully automatic signature update system that automatically performs all the processes, such as traffic collection, signature generation, signature management and signature verification. The step of traffic collection automatically collects ground-truth traffic through the traffic measurement agent (TMA) and traffic management server (TMS). The step of signature management removes unnecessary signatures. The step of signature generation generates new signatures. Finally, the step of signature verification removes the false-positive signatures. The proposed system can solve the problems of existing systems. The result of this system to a campus network showed that, in the case of four applications, high recall values and low false-positive rates can be maintained.

Routing Algorithms on a Ring-type Data Network (링 구조의 데이터 통신망에서의 라우팅 방안)

  • Ju, Un-Gi
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2005.05a
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    • pp.238-242
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    • 2005
  • This paper considers a routing problem on a RPR(Resilient Packet Ring). The RPR is one of the ring-type data telecommunication network. Our major problem is to find an optimal routing algorithm for a given data traffic on the network under no splitting the traffic service, where the maximum load of a link is minimized. This paper characterizes the Minmax problem and develops two heuristic algorithms. By using the numerical comparison, we show that our heuristic algorithm is valuable for efficient routing the data traffic on a RPR.

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Study on Call Admission Control in ATM Networks Using a Hybrid Neural Network. (하이브리드형 신경망을 이용한 ATM망에서의 호 수락제어에 관한 연구)

  • 김성진;서현승;백종일;김영철
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.94-97
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    • 1999
  • In this paper, a new real-time neural network connection admission controller is proposed. The proposed controller measures traffic flows, cell loss rate and cell delay periodically each classes. The Neural network learns the relation between those measured information and service quality by real-time. Also the proposed controller uses the DWRR multiplexer with buffer dedicated to every traffic source in order to measure the delay that cells experience in buffer. Experimental result shows that the proposed method can control effectively heterogeneous traffic sources with diverse QoS requirement.

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Effects of Forwarders on TCP Performance in Network Coding for Wireless Mesh Networks (무선 메쉬 네트워크의 네트워크 코딩에서 패킷 전달자들이 TCP 성능에 미치는 영향)

  • Lim, Chan-Sook;Ahn, Hong-Young
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.6
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    • pp.39-45
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    • 2010
  • Most traffic in the real internet is TCP traffic. Therefore newly proposed network coding schemes must consider their effects on TCP performance. However, in most studies on network coding, performance evaluation has been conducted using other types of traffic than TCP traffic because network coding has effects on the pattern of packet transmission, which again can impact TCP performance. In most packet transmission schemes based on network coding for wireless mesh networks, it is determined which node, among the ones that received a broadcasted packet, should encode and forward it. In this paper, we examine how the forwarder nodes impact TCP performance.

The Study on the Performance Evaluation of IPTV according to the increase of network traffic on the Internet Environment (인터넷환경에서 트래픽증가에 따른 IPTV 성능평가에 관한 연구)

  • Cho, Tae-Kyung
    • Journal of Digital Convergence
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    • v.13 no.11
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    • pp.179-185
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    • 2015
  • In this paper, we research the IPTV that is the convergence technique of TV and network technique and performed the performance evaluation of picture quality of IPTV in the situation of increasing the network traffic in the Internet environment. To do this, we constructed the mock Internet network similar to the real Internet environment and measured the quality of received video using V-Factor model according to the increase of network traffic, and analyzed the result of the experiment. Making use of the result of this paper for the threshold value of V-Factor, the measured factor of network performance, the measured factor of video performance in the watchable IPTV video quality.

On-line Fussy Performance Management of Profibus Networks

  • Lee, Kyung-Chang;Song Kang;Kim, Dong-Wook;Lee, Suk
    • International Journal of Precision Engineering and Manufacturing
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    • v.1 no.2
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    • pp.5-13
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    • 2000
  • Most networks for automation are tuned to an expected traffic condition ar their design stage. During their actual operations, however, the networks experience considerable changes in traffic from time to time. These traffic changes caused by common events like machine failure and production schedule change may adversely affect th network performance and, in turn , the performance of the connected devices. This paper presents experimental results for performance management of a Profibus-FMS network. The performance management aims to maintain a uniform level of network performance at all stations under changing network traffic. The performance management algorithm monitors the performance of individual network stations and commands the stations to change their timer values in order to have comparable performance at all stations. In order to determine the amount of timer change, the algorithm employs a set of fuzzy rules. The algorithm has been evaluated on a Profibus network.

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