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Finding the best possible encoding decisions for compressing a video sequence is a highly complex problem. In this work, we propose a multi-objective Design Space Exploration (DSE) method to automatically find HEVC encoder implementations that are optimized for several different criteria. The DSE shall optimize the coding mode evaluation order of the mode decision process and jointly explore early...
System-level power modeling and estimation is a non-trivial task for the architecture and power management strategies exploration during early design phases of a cellular LTE modem. It requires system architects to consider not only highly heterogeneous SoC architectures, but also various worldwide LTE network configurations and dynamic scheduling which impact modem power consumption significantly...
Task-accurate performance estimation methods are widely applied in early design phases to explore different architecture options. These methods rely on accurate annotations generated by software profiling or real measurements to guarantee accurate results. However, in practice, such accurate annotations are not available in early design phases due to lack of source code and hardware platform. Instead,...
One of the most important figures of merit concerning mobile devices is their energy efficiency. However, the modeling of such systems is mainly focused on the functional aspects, but not on the power consumption. Therefore, power estimations can only be accomplished late in the design process, after all architectural decisions have been taken. This might lead to designs that are not optimal with...
In this paper, we propose a top-down power and performance estimation methodology for heterogeneous multiprocessor systems-on-chip. The proposed approach is applicable at the Electronic System Level (ESL). Thus, power and performance estimation can be applied in very early design phases. By strictly separating the system functionality from its architecture, different design options can be assessed...
In striated muscles, intracellular Ca2+ release is tightly controlled by the membrane voltage sensor. Ca2+ ions are necessary mediators of this control in cardiac but not in skeletal muscle, where their role is ill-understood. An intrinsic gating oscillation of Ca2+ release—not involving the voltage sensor—is demonstrated in frog skeletal muscle fibers under voltage clamp. A Markov model of the Ca...
Hidden Markov models have been used to restore recorded signals of single ion channels buried in background noise. Parameter estimation and signal restoration are usually carried out through likelihood maximization by using variants of the Baum–Welch forward–backward procedures. This paper presents an alternative approach for dealing with this inferential task. The inferences are made by using a combination...
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