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According to the different demand on realtime of periodic and non-periodic data, the improved real time communication protocol CSMA/NT is presented with node transfer based on non-destroyed priority bit-by-bit arbitration. The performance analysis shows that it decreases the probability of data collision effectively, ensures a limited transmission time and makes maximum delay time adjustable, leads...
According to the characteristics of data in coalmine industrial Ethernet ring networks and in order to guarantee the demand of the real-time data in it, a hybrid scheduling method with non-preemptive priority and EDF scheduling method based on the IEEE802.1p protocol is proposed in the switch. We calculate the maximum transmitting delay of the real-time data using network calculus theory. The result...
Real-time Ethernet emerges as the primary supporting technology for the next generation of industrial communications. As real-time performance is critical in many industrial applications, how to evaluate it in industrial Ethernet becomes vitally important. In this paper a mathematical model using Network Calculus is presented to calculate the upper bound of end-to-end delay in hybrid networks.
To address the problems of network congestion, Active queue management (AQM) is advocated to improve the quality of services (QoS) for Internet. Random early detective (RED) algorithm is one of notably AQM mechanism, because it could reduce the high drop rate of bursty flows, avoid global synchronization among flows and reduces network latency (“ping time”). However, RED requires careful tuning of...
A feedback procedure is introduced to the robust berth allocation problem with stochastic vessel delays. This procedure emphasizes the interrelationship between the planning stage and the real-time stage, and employs the cost of schedule changes in the real-time stage to instruct time buffer adjustment for each vessel. Experimental results show that this procedure performs well in different vessel...
This paper reviews real-time (RT) Ethernet and discusses special requirements for numerical control (NC). Then such a real-time Ethernet - EtherMAC (Ethernet for Manufacture Automation Control) is presented. EtherMAC uses master-slave communication structure. The master device supports standard Network Interface Card (NIC), and the slave device has a modified one - removing CSMA/CD (Carrier Sense...
This paper discusses the technical structure and utilization of remote supervisory control system. And the novel dual-parallel coupled inverted pendulum platform is constructed. Client-Server architecture is developed with the network communication for closed-loop control. The application allows performing a number of laboratory scale hard real-time control experiments, which can be remotely monitored...
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