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Delay and security are both highly concerned in the Internet of Things (IoT). In this paper, we set up a secure analytical framework for IoT networks to characterize the network delay performance and secrecy performance. Firstly, stochastic geometry and queueing theory are adopted to model the location of IoT devices and the temporal arrival of packets. Based on this model, a low-complexity secure...
The quantized feedback controller is investigated for networked control systems with network delay, quantization and data packet loss. Firstly, the packet dropout, network delay and quantization are considered simultaneously, the random variation of packet dropout is illustrated by Markov chain. Then the network system is described by Markov jump system, the influence of the quantization error can...
In recent years, many studies on optimization of energy consumption have focused on heterogeneous processor architectures. Heterogeneous computing model composed of CPU and GPU has developed from co-processing between the chips to CPU and GPU integration on the same die. On the one hand, because GPU can work under low voltage and ultra-low frequency, heterogeneous multi-core processors exhibit better...
When the inductor current of boundary conduction mode (BCM) Buck converter, falls to zero, the output filter inductor will resonate with the capacitor across the switch called Quasi Resonant (QR). If the switch is turned on when the voltage of resonant capacitor is zero, ZVS and ZCS turn-on can be achieved, the switching loss is eliminated. This thesis analyses the resonant between the output inductor...
We propose Geo FS, a POSIX-compliant, wide-area distributed file system, which is used for sharing files between sites. Geo FS uses FUSE to provide standard file system interfaces to applications, it allows users to control over consistency and replication via extended attributes. In the era of big data, traditional file systems do not adapt well to update a large directory (i.e. Huge number of files...
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