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With the advent of portable and autonomous computing systems, power
con sumption has emerged as a focal point in many research
projects, commercial systems and DoD platforms. One current
research initiative, which drew much attention to this area, is the
Power Aware Computing and Communications (PAC/C) program sponsored
by DARPA. Many of the chapters in this book include results from
work that have been supported by the PACIC program. The performance
of computer systems has been tremendously improving while the size
and weight of such systems has been constantly shrinking. The
capacities of batteries relative to their sizes and weights has
been also improv ing but at a rate which is much slower than the
rate of improvement in computer performance and the rate of
shrinking in computer sizes. The relation between the power
consumption of a computer system and it performance and size is a
complex one which is very much dependent on the specific system and
the technology used to build that system. We do not need a complex
argument, however, to be convinced that energy and power, which is
the rate of energy consumption, are becoming critical components in
computer systems in gen eral, and portable and autonomous systems,
in particular. Most of the early research on power consumption in
computer systems ad dressed the issue of minimizing power in a
given platform, which usually translates into minimizing energy
consumption, and thus, longer battery life."
With the advent of portable and autonomous computing systems, power
con sumption has emerged as a focal point in many research
projects, commercial systems and DoD platforms. One current
research initiative, which drew much attention to this area, is the
Power Aware Computing and Communications (PAC/C) program sponsored
by DARPA. Many of the chapters in this book include results from
work that have been supported by the PACIC program. The performance
of computer systems has been tremendously improving while the size
and weight of such systems has been constantly shrinking. The
capacities of batteries relative to their sizes and weights has
been also improv ing but at a rate which is much slower than the
rate of improvement in computer performance and the rate of
shrinking in computer sizes. The relation between the power
consumption of a computer system and it performance and size is a
complex one which is very much dependent on the specific system and
the technology used to build that system. We do not need a complex
argument, however, to be convinced that energy and power, which is
the rate of energy consumption, are becoming critical components in
computer systems in gen eral, and portable and autonomous systems,
in particular. Most of the early research on power consumption in
computer systems ad dressed the issue of minimizing power in a
given platform, which usually translates into minimizing energy
consumption, and thus, longer battery life."
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