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A Reduced Reachability Tree for a Class of Unbounded Petri Nets 被引量:3
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作者 Shouguang Wang Mengdi Gan +1 位作者 Mengchu Zhou Dan You 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI 2015年第4期345-352,共8页
As a powerful analysis tool of Petri nets, reachability trees are fundamental for systematically investigating many characteristics such as boundedness, liveness and reversibility. This work proposes a method to gener... As a powerful analysis tool of Petri nets, reachability trees are fundamental for systematically investigating many characteristics such as boundedness, liveness and reversibility. This work proposes a method to generate a reachability tree, called ωRT for short, for a class of unbounded generalized nets called ω-independent nets based on new modified reachability trees (NMRTs). ωRT can effectively decrease the number of nodes by removing duplicate and ω-duplicate nodes in the tree, and verify properties such as reachability, liveness and deadlocks. Two examples are provided to show its superiority over NMRTs in terms of tree size. © 2014 Chinese Association of Automation. 展开更多
关键词 Petri nets
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Conceptual model of real-time IoT systems 被引量:1
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作者 Bo YUAN De-ji CHEN +1 位作者 Dong-mei XU Ming CHEN 《Frontiers of Information Technology & Electronic Engineering》 SCIE EI CSCD 2019年第11期1457-1464,共8页
We address a special kind of Internet of Things (IoT) systems that are also real-time. We call them real-time IoT (RT-IoT) systems. An RT-IoT system needs to meet timing constraints of system delay, clock synchronizat... We address a special kind of Internet of Things (IoT) systems that are also real-time. We call them real-time IoT (RT-IoT) systems. An RT-IoT system needs to meet timing constraints of system delay, clock synchronization, deadline, and so on. The timing constraints turn to be more stringent as we get closer to the physical things. Based on the reference architecture of IoT (ISO/IEC 30141), the RT-IoT conceptual model is established. The idea of edge subsystem is introduced. The sensing & con-trolling domain is the basis of the edge subsystem, and the edge subsystem usually must meet the hard real-time constraints. The model includes four perspectives, the time view, computation view, communication view, and control view. Each view looks, from a different angle, at how the time parameters impact an RT-IoT system. 展开更多
关键词 Internet of Things(IoT) Real-time system Conceptual model VIEW Hard/Soft real-time
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