Donghai Zhu

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By analyzing the basic principle of Otsu method and its application in image segmentation, and according to the distribution characteristics of the target and background, an improved threshold image segmentation algorithm based on the Otsu method is developed. By narrowing the selection range of threshold and searching the minimum variance ratio, the(More)
A novel blocks placement strategy is developed for solving some shortages in recent Hadoop. With the Strategy, the optimal Data nodes, according to the real-time situation of Data nodes, are chosen dynamically to achieve load balancing. Finally, the simulation experiments indicate that our strategy behaves much better than the HDFS blocks placement when the(More)
When network coding is used in wireless mesh networks (WMNs), the epidemic effect of pollution attacks can reduce network throughput dramatically. Nevertheless, little attention has been directed toward the performance gain of network coding versus traditional routing in adversarial wireless mesh networks. To address this critical issue, in this paper, we(More)
Wireless Mesh Networks (WMNs) have potential to provide convenient broadband wireless Internet access to mobile users. With the emergence of Software-Defined Networking (SDN) paradigm that separates control plane and data plane, WMNs can be easily deployed and managed. In addition, by exploiting the broadcast nature of the wireless medium and the spatial(More)
Both opportunistic routing and inter-flow network coding are useful mechanisms for improving the performance of wireless networks. Both of them exploit the broadcast nature of the wireless medium and the spatial diversity of multi-hop wireless networks. In this paper, we aim at incorporating inter­ flow network coding into opportunistic routing for further(More)
OBJECTIVE To explore the differences of the main pharmacological action in wild and cultivated Atractylodes lancea. METHOD Study the effect of the 70% ethanol extracts from the wild and the culticated A. lancea on the mice with gastriculcer induced by absolute ethyl alcohol or HCl. Stdudy the effect on intestinal propulsive function in mice by measuring(More)
We described chemical composition in Cangzhu in recent years, volatile oil is the important chemical composition, The beta-eudesmol, hinesol are active ingredient in volatile oil and there are 38 kind of glycosides. At the same time, we overview the applying of RAPD technology in atractylodes lancea. The results is that there are correlation in chemical(More)