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Adaptive voltage positioning (AVP) technique has been widely used in voltage regulator (VR) applications. In this paper, a digitally controlled buck converter with the proposed current sensor-less AVP technique is presented. Without the need for sensing or sampling the loading condition, the proposed control architecture utilizes the error signal of the digitalized controller to obtain the current...
In this paper, we propose a novel compressed sensing based joint detection and tracking algorithm, named CS-JDT algorithm, to track multiple targets for STAP radar system. A novel general similar sensing matrix pursuit (GSSMP) algorithm is proposed to reconstruct the whole radar scenario (DOA-Doppler plane) for each range gate at consecutive scans. The proposed GSSMP algorithm addresses several problems...
A challenge in wireless sensing is to reduce power consumption during data transmission. Various methods aim at compressing amounts of data after sampling, which require additional computation energy or hardware. In this paper, pSense, a low complexity commercial off-the-shelf based (COTS-based) analog-to-information converter (AIC) platform is presented to minimize power consumption. A periodical...
Security in wireless sensor networks (WSNs) is very important. Traditional security schemes abandon compromised nodes and add a lot of redundancies to make the network resilient. These methods are not applicable to resource-limited WSNs. This paper proposes an adaptive and active defense mechanism with low power consumption. In our scheme, some nodes are configured as monitoring nodes to identify...
The increasing number of cars and bicycles and the growing population make traffic systems more and more unstable. One accident can lead to a big traffic jam. Traffic counts are widely used in optimization of traffic networks, but this kind of data is not available everywhere. In order to improve the reliability and make better use of the capacity of traffic networks, urban properties (such as living...
Supply voltage fluctuation caused by inductive noises has become a critical problem in microprocessor design. A voltage emergency occurs when supply voltage variation exceeds the acceptable voltage margin, jeopardizing the microprocessor reliability. Existing techniques assume all voltage emergencies would definitely lead to incorrect program execution and prudently activate rollbacks or flushes to...
Ferrofluid is usually used as actuation medium in micropump or microvalve where most microchannels were fabricated with PMMA or silicon. The manufacturing is time-consuming and costly. In this paper, we present a novel microchip design based on the magnetic actuation of ferrofluid. The device contains plugs and pistons formed by a ferrofluid which is actuated by an external NdFeB permanent magnet...
Recent advances in the electronics industry and wireless communication have enabled the evolution of innovative application domains. Smaller embedded processors and systems have allowed a new level of mobile communication and interaction in everyday life. In particular, the expansion of broadband wireless services and the advancement of handheld technology have allowed for real-time patient monitoring...
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