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1-4244-2575-4/08/$20.00 © 2008 IEEE As the commercialization of Mobile WiMAX, its security scheme will be challenged by several kinds of attacks. However, few of relevant papers tackle the security issues of WiMAX network. David Johnston and Jesse Walker gave the most complete analysis of WiMAX security in [2], which focused on the problem of 802.16d.(More)
The purpose of the present study was to investigate the interactions between brain microvascular endothelial cells (BMEC) and mesenchymal stem cells (MSC) under hypoxic conditions. Primary cultured human bone marrow MSC and rat BMEC were isolated, cultured and identified. Vascular endothelial growth factor (VEGF) and matrix metalloproteinase-9 (MMP-9) were(More)
Mesenchymal stem cells can be used as a novel treatment of ischemic vascular disease; however, their therapeutic effect and mechanism of action require further evaluation. Mitochondrial dysfunction has core functions in ischemia-reperfusion injury of the microvascular network. A recent discovery has shown that intercellular communication using tunneling(More)
Enchanced Interior Gate Routing Protocol(EIGRP) is a kind of distance vector routing protocol developed by Cisco, and it is mainly based on Diffusing Update Algorithm(DUAL) which computes the best path distributedly without resulting in routing-touble loops and counting-to-infinite problem. DUAL converges as fast as OSPF but leads to less overhead. In this(More)
In this paper, a slot-based MAC protocol is proposed for cognitive radio wireless networks. This protocol makes cognitive users sense licensed channels periodically, and each period consists of a fixed number of slots. When cognitive users identify un-used licensed channels, they use IEEE 802.11 distribution coordination function (DCF) to contend the spare(More)
In this paper a simplified differential amplitude demodulation scheme is proposed for 64-DAPSK (differential amplitude and phase shift keying), which needs less quantity of decision thresholds compared with the conventional schemes. The arithmetic mean threshold (AlMT) scheme is proposed and analyzed with the simplified system in AWGN and flat Rayleigh(More)
We report the case of a 19-year-old Chinese female harboring the m.3291T>C mutation in the MT-TL1 gene encoding the mitochondrial transfer RNA for leucine. She presented with a complex phenotype characterized by progressive cerebellar ataxia, frequent myoclonus seizures, recurrent stroke-like episodes, migraine-like headaches with nausea and vomiting, and(More)