• Title/Summary/Keyword: control network protocol

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An Intelligent PID Controller based on Dynamic Bayesian Networks for Traffic Control of TCP (TCP의 트래픽 제어를 위한 동적 베이시안 네트워크 기반 지능형 PID 제어기)

  • Cho, Hyun-Choel;Lee, Young-Jin;Lee, Jin-Woo;Lee, Kwon-Soon
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.4
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    • pp.286-295
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    • 2007
  • This paper presents an intelligent PID control for stochastic systems with nonstationary nature. We optimally determine parameters of a PID controller through learning algorithm and propose an online PID control to compensate system errors possibly occurred in realtime implementations. A dynamic Bayesian network (DBN) model for system errors is additionally explored for making decision about whether an online control is carried out or not in practice. We apply our control approach to traffic control of Transmission Control Protocol (TCP) networks and demonstrate its superior performance comparing to a fixed PID from computer simulations.

Application Technology Development of Lon Works Fieldbus Network System for Distributed Control System Based Water Treatment Facility

  • Hong, Won-Pyo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2004.05a
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    • pp.404-411
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    • 2004
  • With distribution industrial control system, the use of low cost to achieve a highly reliable and safe system in real time distributed embedded application is proposed. This developed intelligent node is based on two microcontrollers, one for the execution of the application code, also as master controller for ensuring the real time control & the logic operation with CPLD and other for communication task and the easy control execution, i.e., I/O digital input, digital output and interrupting. This paper also presents where the case NCS (Networked control system) with LonTalk protocol is applied for the filtration process control system of a small water treatment plant.

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Framework for End-to-End Optimal Traffic Control Law Based on Overlay Mesh

  • Liu, Chunyu;Xu, Ke
    • Journal of Communications and Networks
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    • v.9 no.4
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    • pp.428-437
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    • 2007
  • Along with the development of network, more and more functions and services are required by users, while traditional network fails to support all of them. Although overlay is a good solution to some demands, using them in an efficient, scalable way is still a problem. This paper puts forward a framework on how to construct an efficient, scalable overlay mesh in real network. Main differences between other overlays and ours are that our overlay mesh processes some nice features including class-of-service(CoS) and traffic engineering(TE). It embeds the end-to-end optimal traffic control law which can distribute traffic in an optimal way. Then, an example is given for better understanding the framework. Particularly, besides good scalability, and failure recovery, it possesses other characteristics such as routing simplicity, self-organization, etc. In such an overlay mesh, an applicable source routing scheme called hierarchical source routing is used to transmit data packet based on UDP protocol. Finally, a guideline derived from a number of simulations is proposed on how to set various parameters in this overlay mesh, which makes the overlay more efficient.

Distributed Construction of the Multiple-Ring Topology of the Connected Dominating Set for the Mobile Ad Hoc Networks: Boltzmann Machine Approach (무선 애드혹 망을 위한 연결 지배 집합 다중-링 위상의 분산적 구성-볼츠만 기계적 접근)

  • Park, Jae-Hyun
    • Journal of KIISE:Information Networking
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    • v.34 no.3
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    • pp.226-238
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    • 2007
  • In this paper, we present a novel fully distributed topology control protocol that can construct the multiple-ring topology of Minimal Connected Dominating Set (MCDS) as the transport backbone for mobile ad hoc networks. It makes a topology from the minimal nodes that are chosen from all the nodes, and the constructed topology is comprised of the minimal physical links while preserving connectivity. This topology reduces the interference. The all nodes work as the nodes of the distributed parallel Boltzmann machine, of which the objective function is consisted of two Boltzmann factors: the link degree and the connection domination degree. To define these Boltzmann factors, we extend the Connected Dominating Set into a fuzzy set, and also define the fuzzy set of nodes by which the multiple-ring topology can be constructed. To construct the transport backbone of the mobile ad hoc network, the proposed protocol chooses the nodes that are the strong members of these two fuzzy sets as the clusterheads. We also ran simulations to provide the quantitative comparison against the related works in terms of the packet loss rate and the energy consumption rate. As a result, we show that the network that is constructed by the proposed protocol has far better than the other ones with respect to the packet loss rate and the energy consumption rate.

Experimental Design of AODV Routing Protocol with Maximum Life Time (최대 수명을 갖는 AODV 라우팅 프로토콜 실험 설계)

  • Kim, Yong-Gil;Moon, Kyung-Il
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.3
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    • pp.29-45
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    • 2017
  • Ad hoc sensor network is characterized by decentralized structure and ad hoc deployment. Sensor networks have all basic features of ad hoc network except different degrees such as lower mobility and more stringent energy requirements. Existing protocols provide different tradeoffs among some desirable characteristics such as fault tolerance, distributed computation, robustness, scalability and reliability. wireless protocols suggested so far are very limited, generally focusing on communication to a single base station or on aggregating sensor data. The main reason having such restrictions is due to maximum lifetime to maintain network activities. The network lifetime is an important design metric in ad hoc networks. Since every node does a router role, it is not possible for other nodes to communicate with each other if some nodes do not work due to energy lack. In this paper, we suggest an experimental ad-hoc on-demand distance vector routing protocol to optimize the communication of energy of the network nodes.The load distribution avoids the choice of exhausted nodes at the route selection phase, thus balances the use of energy among nodes and maximizing the network lifetime. In transmission control phase, there is a balance between the choice of a high transmission power that lead to increase in the range of signal transmission thus reducing the number of hops and lower power levels that reduces the interference on the expense of network connectivity.

Performance Analysis of WiMedia D-MAC Communications for a Shipboard Wireless Bridge (선내 무선 브릿지용 와이미디어 D-MAC 통신의 성능분석)

  • Hur, Kyeong;Jeong, Min-A;Lee, Seong Ro
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39C no.7
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    • pp.597-607
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    • 2014
  • An integrated ship area network has functionality of remote control and autonomous management of various sensors and instruments embedded or boarded in a ship. For such environment, a wireless bridge is essential to transmit control and/or managing information to sensors or instruments from a central integrated ship area network station. In this paper, one of reliable schemes of wireless bridge using WiMedia distributed MAC (D-MAC) protocol is proposed to increase a communication reliability. Simulation results show that the proposed wireless bridge using WiMedia D-MAC protocol guarantees reliable communications between 2-hop devices.

Interactive Visual Analytic Approach for Anomaly Detection in BGP Network Data (BGP 네트워크 데이터 내의 이상징후 감지를 위한 인터랙티브 시각화 분석 기법)

  • Choi, So-mi;Kim, Son-yong;Lee, Jae-yeon;Kauh, Jang-hyuk;Kwon, Koo-hyung;Choo, Jae-gul
    • Journal of Internet Computing and Services
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    • v.23 no.5
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    • pp.135-143
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    • 2022
  • As the world has implemented social distancing and telecommuting due to the spread of COVID-19, real-time streaming sessions based on routing protocols have increased dependence on the Internet due to the activation of video and voice-related content services and cloud computing. BGP is the most widely used routing protocol, and although many studies continue to improve security, there is a lack of visual analysis to determine the real-time nature of analysis and the mis-detection of algorithms. In this paper, we analyze BGP data, which are powdered as normal and abnormal, on a real-world basis, using an anomaly detection algorithm that combines statistical and post-processing statistical techniques with Rule-based techniques. In addition, we present an interactive spatio-temporal analysis plan as an intuitive visualization plan and analysis result of the algorithm with a map and Sankey Chart-based visualization technique.

Serial Communication-Based Fault Diagnosis of a BLDC Motor Using Bayes Classifier

  • Suh, Suhk-Hoon;Woo, Kwang-Joon
    • International Journal of Control, Automation, and Systems
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    • v.1 no.3
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    • pp.308-314
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    • 2003
  • This paper presents a serial communication based fault diagnosis scheme for a brushless DC (BLDC) motor using parameter estimation and Bayes classifier. The presented scheme consists of a smart network board, and a fault detection and isolation (FDI) master. The smart network board is installed near the BLDC motor drive system to acquire motor data and transmit motor data to the FDI-master via serial communication channel. The FDI-master estimates BLDC motor resistance to detect symptom of faults, and assign symptom to fault type using Bayes classifier. In this scheme, since communication time delay has a serious effect on performance, periodic and fixed communication protocol is designed. Hence, the delay time is priory known. By experiment result, presented scheme was verified.

Development of a Real-time Communication Service over Random Medium Access Scheme Networks

  • Choo, Young-Yeol;Kwon, Jang-Woo
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.350-353
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    • 2004
  • The increasing use of Ethernet-TCP/IP network in industry has led to the growing interest in its reliability in real-time applications such as automated manufacturing systems and process control systems. However, stochastic behavior of its medium access scheme makes it inadequate for time-critical applications. In order to guarantee hard real-time communication service in Ethernet-TCP/IP network, we proposed an algorithm running over TCP/IP protocol stack without modification of protocols. In this paper, we consider communication services guaranteeing deadlines of periodic real-time messages over MAC protocols that have unbounded medium access time. We propose a centralized token scheduling scheme for multiple access networks. The token is used to allow a station to transmit its message during the time amount that is appended to the token. The real-time performance of the proposed algorithm has been described.

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An Rate Control Protocol for Real Time Traffic in Wireless Sensor Network (무선 센서 네트워크 환경에서 실시간 트래픽에 대한 비트율 제어 기법)

  • Monowar, Muhammad Mostafa;Rahman, Md. Obaidur;Hong, Choong-Seon
    • Proceedings of the Korean Information Science Society Conference
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    • 2008.06d
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    • pp.476-479
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    • 2008
  • Wireless Sensor Network typically incorporates various real time applications that must meet timing constraints under severe resource limitations. Due to the high data rate and burst traffic for that type of applications, occurrence of congestion is very common. Ensuring the end-to-end deadline under congested scenario is quite challenging. In this paper we propose a hop-by-hop rate control algorithm which avoids the congestion as well as ensures that the real time traffic will meet the end-to-end deadline by guaranteeing the meeting of local deadline at intermediate hop. Finally, simulation has demonstrated the effectiveness of our approach.

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