Lianglun Cheng

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To improve the accuracy of CC2431-based Zigbee locating system in the indoor environment, a localization algorithm is proposed. Multipath propagation and Corrected multipath fading coefficient is investigated for the relationship of received signal strength (RSS) and distance. Window Mean Exponentially Weighted Moving Average (WMEWMA) is adopted to smooth(More)
Network congestion in wireless sensor networks (WSNs) leads to packet drops, throughput reduction and degradation of channel quality which in turn decrease network performance. A novel cross-layer congestion control strategy for WSNs is presented. The strategy performs the bandwidth and delay estimation in MAC layer for the current link, and feedbacks them(More)
The inadequate resource allocation, lack of I/O performance prediction and insufficient I/O isolation are affecting the storage performance in the multi-tenant cloud storage environment. For Quality of Service (QoS), the Software-defined Storage (SDS) is an effective approach in data centers. However, the lack of intelligence, robustness and self-adjustment(More)
When carrying out the Automatic Optical Inspection (AOI) on the Printing Circuit Board (PCB) adopted Surface Mounted Technology (SMT) , inspecting path planning is a question of combinatorial optimization, every inspecting window exists certain move range. In view of all above problems, this paper studied the standard Particle Swarm Optimization (PSO)(More)
In mobile agent based data fusion, the order of nodes visited along the route by mobile agent has a significant impact on the algorithm efficiency and lifetime of wireless sensor network. In this article, we propose a mobile agent tree routes scheme with data fusion. Considering the energy level of the sensor nodes, we construct the data fusion tree based(More)
Wireless Sensor Networks (WSNs) and Radio Frequency Identification (RFID) are the two most important technologies in pervasive computing. Because of their different applications, researchers tend to research them respectively. This paper presents a new architecture for the integration of these two technologies, which is called RFID Wireless Sensor Networks,(More)
RFID middleware collects and filters RFID streaming data gathered continuously by numerous readers to process requests from applications. These requests are called continuous queries. The problem when using any of the existing query indexes on these continuous queries is that it takes a long time to build the index because it is necessary to insert a large(More)