• 제목/요약/키워드: Traffic control

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무선통신에서 대칭링크 네트워크를 이용한 트래픽 흐름제어 채널분석 (Traffic Flow Control Channels Analysis Using Symmetry Link Network in Wireless Communication)

  • 박광채
    • 한국정보통신학회논문지
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    • 제13권9호
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    • pp.1811-1818
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    • 2009
  • 본 논문은 무선통신 트래픽제어에서 데이터의 흐름을 원활하게 유지 향상시키기 위한 연구이다. 통상적인 TCP 윈도우 흐름제어에서 나타났던 다양한 유형의 버스트현상은 양방향 트래픽제어를 통해 제거하거나 완화시킬 수 있다. 현재는 대기열이 주로 최종 시스템에 위치함으로 인해 무선통신 제어채널을 운영하는 동안에 TCP ACK 압축문제가 발생한다. 그러므로 소스 IP 대기열의 주기적인 버스트 특성을 분석함으로써 대기열의 최대값을 예측하여 적용한다. 이와 같은 예측수단을 무선통신 트래픽제어에 적용하여 대칭트래픽을 제어함으로써 처리율이 현저하게 증가되어 성능이 향상됨을 분석한다.

ATM 망에서 MPEG 비디오 서비스를 위한 Traffic 동적 할당에 대한 연구 (A Study on The Traffic Control Using ATM OAM Cell for MPEG Video Service in ATM Networks)

  • 김민호;이병호
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 1998년도 추계종합학술대회 논문집
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    • pp.87-90
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    • 1998
  • Many recent studies have been conducted involving the transport of constant and variable bit rate MPEG-2 video in asynchronous transfer mode (ATM) networks. In this study, the traffic control of supporting MPEG-2 video communications in ATM networks under unloaded or loaded network conditions, in which the generated traffic sources are bursty in nature, are considered. We analyse about MPEG-2 traffic and design a model, which makes use of the ATM OAM funcation in order to support the traffic control functions. To implement the model, we propose a scheme, which combines the performance management OAM function and the bandwidth allocation function. Especially, we design this scheme to control the VBR (Variable Bit Rate)MPEG-2 video traffic.

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퍼지 적응제어를 통한 도시교차로망의 교통신호제어 (Fuzzy Adaptive Traffic Signal Control of Urban Traffic Network)

  • 진현수;김성환
    • 대한교통학회지
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    • 제14권3호
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    • pp.127-141
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    • 1996
  • This paper presents a unique approach to urban traffic network signal control. This paper begins with an introduction to traffic control in general, and then goes on to describe the approach of fuzzy control, where the signal timing parameters at a given intersection are adjusted as functions of the local traffic network condition and adjacent intersection. The signal timing parameters evolve dynamically using only local information to improve traffic signal flow. The signal timing at an intersection is defined by three parameters : cycle time, phase split, off set. Fuzzy decision rules are used to adjust three parameters based only on local information. The amount of change in the timing parameters during each cycle is limited to a small fraction of the current parameters to ensure smooth transition. In this paper the effectiveness of this method is showed through simulation of the traffic signal flow in a network of controlled intersection.

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Performance Evaluation of WiMedia UWB MAC Protocol Algorithm Supporting Mixed Video and Shipboard Control Data Traffic

  • Jeon, Dong-Keun;Lee, Yeonwoo
    • International Journal of Internet, Broadcasting and Communication
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    • 제8권1호
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    • pp.53-63
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    • 2016
  • This paper applies WiMedia UWB network into a wireless ship area network (WSAN) so as to support high-quality multimedia services on board and reliable instrument control information as well, since the need for mixed high-quality video traffic and shipboard control data traffic is essential for a high-cost valued digital ship. Thus, in this paper, prioritized contention access (PCA) and distributed reservation protocol (DRP) based on WiMedia UWB (ECMA-368) MAC protocols are combined and proposed to such mixed traffic environment, by varying the portions of superframe according to traffic type. It is shown that the proposed WiMedia UWB MAC protocol can provide reliable mixed video and shipboard control data traffic as well.

Design of prevention spillback agorithm using fuzzy rule

  • Hong, Yousik;Cho, Hyungki;Park, Chongkug
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1996년도 Proceedings of the Korea Automatic Control Conference, 11th (KACC); Pohang, Korea; 24-26 Oct. 1996
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    • pp.32-35
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    • 1996
  • Traffic signal cycle optimization is one of the most efficient ways for reducing fuel consumption and improving vehicle waiting time of highsaturated traffic conditions. But most research focused on lowsaturated traffic conditions. Only a few studies have researched traffic control for highsaturated traffic conditions. In this paper reviews the problem of conventional traffic signal system and creates optimal traffic cycle of at the bottom traffic intersection using 27 fuzzy rules. Moreover, to prevent spillback, it can adapt control even though upper traffic intersection has a different saturation rate, road length, road slope and road width.

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Agent-Oriented Fuzzy Traffic Control Simulation

  • Kim, Jong-Wan;Lee, Seunga;Kim, Youngsoon
    • 한국지능시스템학회논문지
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    • 제10권6호
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    • pp.584-590
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    • 2000
  • Urban traffic situations are extremely complex and highly interactive. The multi-agent systems approach can provide a new desirable solution. Currently, a traffic simulator is needed to understand and explore the difficulties in an agent-oriented traffic control. This paper presents an agent-oriented fuzzy logic controller for multiple crossroads simulation. A fuzzy logic control simulation with variables of arrival, queue, and traffic volume could alleviate traffic congestion. We developed an agent-oriented simulator suitable for traffic junctions with η$\times$η intersections in Visual C++. The proposed method adaptively controls the cycle of traffic signals even though the traffic volume varies. The effectiveness of this method was shown through simulation of multiple intersections.

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Road Traffic Control Gesture Recognition using Depth Images

  • Le, Quoc Khanh;Pham, Chinh Huu;Le, Thanh Ha
    • IEIE Transactions on Smart Processing and Computing
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    • 제1권1호
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    • pp.1-7
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    • 2012
  • This paper presents a system used to automatically recognize the road traffic control gestures of police officers. In this approach,the control gestures of traffic police officers are captured in the form of depth images.A human skeleton is then constructed using a kinematic model. The feature vector describing a traffic control gesture is built from the relative angles found amongst the joints of the constructed human skeleton. We utilize Support Vector Machines (SVMs) to perform the gesture recognition. Experiments show that our proposed method is robust and efficient and is suitable for real-time application. We also present a testbed system based on the SVMs trained data for real-time traffic gesture recognition.

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다중 교차로에서의 지능형 교통제어 알고리즘 개발 및 페트리네트를 이용한 성능측정 (Developing an Intelligent Traffic Control Algorithm in Multi-Intersections, and Performance Analysis using Petri Nets)

  • 강영화;고인선
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.66-66
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    • 2000
  • In this parer, we introduce an algorithm to control flows of the traffic in multi-intersections. It is pointed out that the main problem in traffic control is how to resolve the congested situations for the particular time-durations and directions. The heavy load to a certain direction usually leads the intersection to congested situations, and the adjacent intersections are affected. We control and analyze the traffic flow of multi-intersections consisting of five intersections, in which four intersections are linked to the four directions of the central one. The entrance of vehicles of each direction is described using the concept of probability. We compare the performance of the pretimed signal controls to the traffic adaptive signal controller using a Petri Net simulation tool, Exspect.

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상위체계구조를 이용한 지역교통망 통제모형 개발 (Development of Area Traffic Control Model by Using High Level Architecture)

  • 이상헌
    • 한국경영과학회:학술대회논문집
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    • 한국경영과학회 2004년도 추계학술대회 및 정기총회
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    • pp.3-7
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    • 2004
  • There are some limitations in the analysis and evaluation for area traffic control systems. The area traffic is consist of several intersections interconnected which are very complicated and many traffic strategy are adopted for the control system. This paper features an effective area traffic control system by High Level Architecture(HLA) which is a new developed simulation tool. In this paper, we discuss the design of HLA-based area traffic control simulation. We describe technical motivations for the HLA, the key elements of the architecture and how they are minimum and essential to the goal of reuse and interoperability in simulation arena.

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Computer Simulation: A Hybrid Model for Traffic Signal Optimisation

  • Jbira, Mohamed Kamal;Ahmed, Munir
    • Journal of Information Processing Systems
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    • 제7권1호
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    • pp.1-16
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    • 2011
  • With the increasing number of vehicles in use in our daily life and the rise of traffic congestion problems, many methods and models have been developed for real time optimisation of traffic lights. Nevertheless, most methods which consider real time physical queue sizes of vehicles waiting for green lights overestimate the optimal cycle length for such real traffic control. This paper deals with the development of a generic hybrid model describing both physical traffic flows and control of signalised intersections. The firing times assigned to the transitions of the control part are considered dynamic and are calculated by a simplified optimisation method. This method is based on splitting green times proportionally to the predicted queue sizes through input links for each new cycle time. The proposed model can be easily translated into a control code for implementation in a real time control system.