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With the advancement of technology, embedded systems have been widely used in portable devices. Portable embedded systems must have rather superior computing capability in order to meet real-time application demands. It is very important for the design of portable embedded system to enable minimum energy consumption while meeting real-time application demands. Dynamic voltage scaling technology enables effective reduction of energy consumption by utilizing slack time to modify operation voltage and frequency of processor in order to reduce energy consumption. Multi-core systems have gradually become mainstream products providing better throughput capacity than single-core systems under the same working clock frequency. However, in multi-core environment the real-time scheduling is an NP-hard issue.
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