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The effect of shield tunnel construction on adjacent masonry structure building with strip foundation was simulated by 3D FEM MIDAS/GTS software. The interaction of tunnel-soil-building was considered. The results show that: the two-way uneven settlement of building was induced during shield tunnel passing it. The maximum building shear strain decreased when the axis distance L between shield tunnel...
This paper addresses issues on the assessment of the performance degradation caused by decreasing channel state information (CSI) of cooperative communication systems that employ opportunistic decode-and-forward (DF) relay under Nakagami-m fading conditions. Exact closed-form performance expressions are derived for the end-to-end average symbol error probability (ASEP) for both partial- and full-CSI...
The phenomenon of Resource Island has a long history. Many researchers and experts from business have introduced several solutions from technical view, but the actual results are not satisfactory. Through analyzing the life cycle model and the flow model of digital learning objects, in the context of computer hardware technology and Internet developing further, we proposed a new method of solving...
In a cognitive radio network (CRN), instead of direct leaving, an interrupted secondary user (SU) is suspended to wait for another channel. The policy for the packets generated by the SU during the suspending time can be either discarding or buffering. This paper mainly analyzes the performance of a CRN against these two policies. Here, two Markov models are proposed to derive the formulas for packet...
Analytic model is proposed to evaluate the packet delay, the delay jitter and the packet loss probability of IEEE 802.11 Distributed Coordination Function (DCF) in multi-hop Ad Hoc Networks. This model can also be easily extended to analyze the Enhanced Distributed Channel Access (EDCA). By modeling each node as a discrete time G/G/1 queue, the closed form expressions of the delay, the delay jitter...
In this paper, we present an analytic model for evaluating the delay, delay jitter and the packet loss probability in multi-hop ad hoc networks using the IEEE 802.11 distributed coordination function (DCF) as MAC protocol. By modeling each node as a discrete time G/G/1 queue, we derive the closed form expressions of the end-to-end delay, delay jitter and the packet loss probability for different circumstances...
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