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황영시(Youngsi Hwang),김원진(Wonjin Kim),정찬민(Chanmin Jung),정기석(Kiseok Chung) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
Embedded OS-directed power management techniques have gained lots of attention lately. Because the OS has the manager of the overall system operation, and has the exact information of the running system. Power management by the OS may have great impact for the optimization of the power consumption. The ACPI (Advanced Configuration and Power Interface) is an open industry specification co-developed by Intel, Microsoft, and Toshiba that defines a flexible and extensible interface for power management in PCs and related hardware. Since the ACPI lias been proposed for the desktop PC, it is not sufficient to aggressively manage the power mode for embedded systems. Therefore, we implement E-ACPI, an extended ACPI which is designed for an advanced power management of embedded systems. In this paper, we address (ⅰ) how we extend the exiting ACPI to E-ACPI, (ⅱ) technical challenges to overcome in implementation, and (ⅲ) how we port our E-ACPI to an embedded linux system in this paper. Experimental results show that our E-ACPI is very useful and effective in practice.
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회로의 대칭성을 이용한 연산 회로에서의 전력 최소화 기법
鄭基錫 弘益大學校 科學技術硏究所 2003 科學技術硏究論文集 Vol.14 No.-
In this paper, we focus on another important design objective, power minimization, utilizing circuit symmetries. First, we analyze and establish the relationship between several types of circuit symmetry and their applicability to reducing power consumption of the circuit, proposing a set of re-synthesis techniques utilizing the symmetries. We derive an algorithm for detecting the symmetries on a given circuit implementation. We then propose effective transformation algorithms to minimize power consumption using the symmetry information detected from the circuit. Unlike many other approaches, our transformation algorithm is especially effective in reducing power consumption of arithmetic-intensive circuits in terms of switching activities. And this is practically useful in that user can check the intermediate re-synthesized designs in terms of the degree of changes of power, area, timing. On average, we reduced the power consumption of circuits by 12% with almost no area or timing overhead.
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