portable computers; real-time systems; secondary cells; power generation scheduling; computational complexity; frequency control; power engineering computing; real time task scheduling algorithms; maximum utilization; secondary batteries; portable devices; low power energy techniques; dynamic real time scheduling algorithms; real time tasks; frequency control; secondary battery consumption; CPU frequency; real time scheduling algorithm; computational complexity; amortized analysis; scheduling problem; discrete frequency control; decision problem; NP-complete; task switching; optimal scheduling algorithm; arbitrary frequency
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