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It has been the conventional assumption that, due to the superlinear dependence of leakage power consumption on temperature, and widely varying on-chip temperature profiles, accurate leakage estimation requires detailed knowledge of thermal profile. Leakage power depends on integrated circuit (IC) thermal profile and circuit design style. We show that(More)
— In the past, dynamic voltage and frequency scaling (DVFS) has been widely used for power and energy optimization in embedded system design. As thermal issues become increasingly prominent, we propose design-time thermal optimization techniques for embedded systems. By carefully planning DVFS at design time, our techniques proactively optimize system(More)
Recently, general-purpose graphics processing units (GPGPUs) have been widely used to accelerate computing in various applications. To store the contexts of thousands of concurrent threads on a GPU, a large static random-access memory (SRAM)-based register file is employed. Due to high leakage power of SRAM, the register file consumes 20% to 40% of the(More)
—Nonvolatile processors offer a number of desirable properties including instant on/off, zero standby power and resilience to power failures. This paper presents a fabricated nonvolatile processor based on ferroelectric flip-flops. These flip-flops are used in a distributed fashion and are able to maintain system states without any power supply(More)
This paper pioneers the maximum power point tracking (MPPT) of photovoltaic (PV) cells that directly supply power to a microprocessor without an energy storage element (a battery or a large-size capacitor) nor power converters. The maximum power point tracking is conventionally performed by an MPPT charger that stores in the energy storage element, and a(More)
Wireless sensor networks hold the potential to open new domains to distributed data acquisition. However, such networks are prone to premature failure because some nodes deplete their batteries more rapidly than others due to workload variations, non-uniform communication, and heterogenous hardware. Many-to-one traffic patterns are common in sensor(More)
Racetrack memory is an emerging non-volatile memory based on spintronic domain wall technology. It can achieve ultra-high storage density. Also, its read/write speed is comparable to that of SRAM. Due to the tape-like structure of its storage cell, a "shift" operation is introduced to access racetrack memory. Thus, prior research mainly focused on(More)
Energy harvesting sensor nodes based on real nonvolatile processors are demonstrated to show the desirable characteristics of those systems, such as no battery, zero stand-by power, microsecond-scale sleep and wake-up time, high resilience to random power failures and fine-grained power management. Furthermore, we show its applications to a distributed(More)
Nonvolatile processor has become an emerging topic in recent years due to its zero standby power, resilience to power failures and instant on feature. This paper first demonstrated a fabricated nonvolatile 8051-compatible processor design, which indicates the ferroelectric nonvolatile version leads to over 90% area overhead compared with the volatile(More)
Due to its high density, bit alterability, and low standby power, phase change memory (PCM) is considered as a promising DRAM alternative. In embedded systems, especially battery-driven mobile devices, energy is one of the most important performance metrics. Therefore, it becomes an interesting problem of utilizing PCM for energy optimization in embedded(More)