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The traditional SPLL can't accurately track the frequency and phase of the grid voltage under the condition of unbalanced and seriously distorted three-phase voltage. To solve this problem, the novel SPLL model based on Sequence Decoupled Resonant (SDR) combined with Second Order Generalized Integrator (SOGI) is proposed. By using the technic of SDR and SOGI, this design successfully achieves the...
In response to a continually advancing threat incurred by untrusted codes from Internet, various virtualization-based technologies have been proposed. Such technologies utilize a software layer, a virtual machine monitor or hyper visor, to achieve the highest privilege in a computer system. Generally, they construct isolated execution environments to run the untrusted code while shielding the other...
A large number of illegal and harmful content carried over the Internet could adversely affect the national cultural security, the people's view on living and the teenager's healthy growth, and must be supervised effectively. Researching and developing the Internet content rating implementation system is one of the feasible means to accomplish Internet content rating, monitoring and filtering. Firstly,...
Because of wide area deployment, heterogeneity, dynamism, and other characteristics of large-scale distributed system (LDS), experimental environment supporting dynamic analysis is important for vulnerability analysis of LDS. In this paper, we summarize the requirements of experimental environment for LDS vulnerability analysis, propose and establish a universal emulation experimental environment...
Prediction model for post-fire mortality based on fire resistance of Pinus yunnanensis and the information at damage trees after forest fire could provide theory basis for estimating damage of forest fire and designing schemes of vegetation restoration in burned area in short time after forest fire. Post-fire mortality and crown-fire characteristics of Pinus yunnanensis trees was investigated in the...
Mobile-learning (m-learning) is not a new word in education nowadays, since it can be carried out time and space independently. However, it is difficult to be used for systematic study. In the other hand, Web2.0 has been prevailed in internet. The most outstanding traits of Web2.0 are harnessing collective intelligence, centering on individual and self-organization, which can increase learners' initiative...
The cost of the three-dimensional virtual studio system is very expensive, and it needs a lot of professional workers, the two and half dimensional low cost virtual studio can't perform quite well in third dimension, as to this circumstances, a low cost three-dimensional virtual studio system is designed in this paper, the system's structure, the problems and the solution in the system development...
With the development of virtual studio technology, the application in the field of education has been emerging in China, especially for high-quality educational resource authoring. However traditional virtual studio systems have not been widely deployed. The reason is not only the large investment but also the complexity of the operation and maintenance of the system. Thus new virtual studio system...
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