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It is important to estimate accurately the remaining worst case execution cycles in a program to improve the effect that intra-task dynamic voltage and frequency scaling (DVFS) has on energy reduction. Since checkpoints for DVFS involve execution time and energy overhead, it is necessary to calculate where those checkpoints should be inserted in the program and the processor frequency at each execution...
We propose a novel system level power estimation method for wireless communication devices. The method estimates the power consumption of a processor and external devices by only using OS level profile information (i.e., the system call information), and is applicable to both off-line and online power optimizations. Evaluations on a commercial wireless communication device showed that the method achieves...
We propose a new index, sparse density (SPD), of stationary stabilograms for detecting the metamorphism in the (temporally averaged) potential function of stochastic differential equations, which occurs when a human attempts to maintain an upright posture. It is known that a mathematical model of the body sway can be developed by a stochastic process. The authors have succeeded in finding the nonlinearity...
The principles for good design of battery-aware voltage scheduling algorithms for both a periodic and periodic task sets on dynamic voltage scaling (DVS) systems are presented. The proposed algorithms are based on greedy heuristics suggested by several battery characteristics and Lagrange multipliers. To construct the proposed algorithms,we use the battery characteristics in the early stage of scheduling...
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