Due to globalization, global trade is strongly growing nowadays. The use of containers has significantly increased and bringing the change on the shape of the world economy. Thus, monitoring every single container is a big challenge for port industries. Furthermore, rapid development in embedded computing systems has led to the emergence of Wireless Sensor Network (WSN) technology which enabled us to envision the intelligent containers. This represents the next evolutionary development in logistics industry to increase the efficiency, productivity, security of containerized cargo shipping. In this paper, we present a comprehensive containerized cargo monitoring system based on WSNs. We incorporated tilt/motion sensor to improve the network convergence time of container networks. Moreover, we periodically switch the nodes into sleeping mode to save energy and extend the lifetime of the network. Based on the technical implementation on a real container vessel, we strongly believed that our design which employed WSN technology is viable to be implemented in container logistics to improve port services and provide safe transport of containerized cargo.

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A novel switching scheme using multiple shared memories is proposed. It has low implementation complexity and ideal performance for both uniform traffic and non-uniform traffic without speedup. The proposed algorithm assigns an output time for each incoming data according to its destination and distributes them into 2N shared memories that can be addressable by output time, where N is the number of input/output ports. Experimental results show that the proposed scheme has good performance for both uniform traffic and nonuniform traffic.Introduction: A switch is used to transfer packets from input ports to destination ports. Variable length packets are segmented into fixed length cells for switching. An output buffered switch has ideal throughput performance; however it has high implementation complexity. In the output buffered switch, the memory speed of the output buffers must be N times faster than the link speed for N links. In a buffered crosspoint switch, N 2 queues at the crosspoint and N input queues are required. Combined input and output queuing switches effective for both uniform and non-uniform traffic have high implementation complexity such as 2 ∼ N times switching fabric speedup [1,2]. These switch schemes are inadequate for very high-speed large switches with a large number of ports.

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