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Mobile devices have a limited source of energy. Therefore, the efficient use of energy is a key factor for a good user experience. In the present work, we have simulated, implemented and compared policies for dynamic power management considering the power consumption and performance penalty rates of a real Wi-Fi network interfaces.
Analytical battery models such as Rakhmatov-Vrudhula are tipically represented in discrete-time, and then implemented by software. However, by means of Model-based design and automatic code generation, it is possible to generate embedded code directly from a continuous time representation. Therefore, in this work we present an analytical battery model in continuous-time by means of the Laplace transform,...
Network interfaces are components largely employed in battery powered mobile devices. Considering the need to save energy on these devices, power management policies were developed taking advantage of idle components, including network interfaces. To increase the efficiency of power management policies for network interfaces, the detection of idle periods with a high hit rate is relevant. In this...
Minimizing the power consumption in mobile devices is critical to increase the battery life. The present work simulated and implemented, at the user space level, four dynamic power management policies for network interfaces. In addition, one mechanism was improved and enabled the identification of three specific workloads for network interfaces.
For computer systems, it is essential the establishment of policies for reducing consumption and avoiding the waste of energy. However, traditional approaches for retrieving energy consumption information are not suitable for creating effective policies. In this paper, we present a power estimation model that provides detailed information about energy consumption of processors and devices, by applying...
This work presents the implementation of an experimental platform for monitoring the power consumption of mobile devices, such as smartphones, notebooks and netbooks. In this platform, a robust electrical circuit is connected to a data aquisition module for power measurements via a virtual instrumentation implemented in the LabVIEW software. The computer system state was measured by means of operating...
Network interfaces are present in a variety of battery powered computer systems, such as notebooks, ultrabooks, tablets and mobile phones. Considering that the battery life is still a constraint, there are opportunities for power management by reducing the power consumption of idle network interfaces. In this work, a dynamic timeout power policy for network interfaces is presented, incorporating workload...
Smartphones are available anytime and anywhere, enabling applications to determine the user location. In this work we investigate the hypothesis that it is possible to determine contextual information of the users based on the places they usually go. In this sense, we developed a model to infer such information and carried out an empirical experiment to validate the model. We also use the contextual...
Pervasive Advertising stands out from other forms of ad serving by using contextual information of consumers. However, providing relevant ads is not enough for effective Pervasive Advertising. It is also necessary to address the objectives of the advertisers, leading to a trade off between advertisers' objectives and consumers' needs. This paper presents a solution based on multiagent negotiation...
Timeout power management policies are widely used in mobile devices for saving power by switching on and off peripherals like display, hard disks, or network interfaces. However the selection of the timeout policy is usually based on heuristic approaches. In this case, a wrong timeout policy may increase the power consumption and degrade the performance. In this work, a probabilistic approach for...
The estimation of power models for computer systems is important for the development process of dynamic power managers. In this work, a power model is estimated based on a constrained linear least-squares technique.
Minimization of power consumption is essential for battery-powered computing systems. In this paper, System identification and Feedback control are applied to the processor power management problem when the workload is known a priori.
Power management techniques are applied to several types of computer systems, such as desktops, servers and embedded systems. For all of those systems, the use of a power management technique is expected to decrease power consumption without degrading performance. Therefore, a variety of power management techniques tailored for specific hardware architectures and the power management mechanisms for...
Open Multimedia Application Platforms (OMAP), such as 161x and 2420, are dual core processors with an Advanced Risk Machine (ARM) and a fixed-point Digital Signal Processor (DSP). The decision of issuing or not part of an application to be executed by the DSP core must be carefully made, because of both, the additional complexity related to the design process, and the time overhead involved with control...
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