The Experts below are selected from a list of 6570 Experts worldwide ranked by ideXlab platform
Tongwen Chen - One of the best experts on this subject based on the ideXlab platform.
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optimal Alarm Signal processing filter design and performance analysis
IEEE Transactions on Automation Science and Engineering, 2013Co-Authors: Yue Cheng, Iman Izadi, Tongwen ChenAbstract:Accuracy and efficiency of Alarm systems are of paramount importance in safe operations of industrial processes. Accuracy is measured by false and missed Alarm rates (probabilities); while efficiency relates to the detection delay and complexity of the technique used. Moving average filters are often employed in industry for improved Alarm accuracy. Can one do better than moving average filters? The following two problems are studied in this paper: First, given both normal and abnormal statistic distributions, how to design an optimal Alarm filter (of fixed complexity) for best Alarm accuracy, minimizing a weighted sum of false and missed Alarm rates? Second, in what cases are moving average filters optimal? For the first problem, design of optimal linear FIR Alarm filters is studied, and a numerical optimization based procedure is proposed. For the second problem, a sufficient condition is given under which the moving average filters are optimal.
Jun Yang - One of the best experts on this subject based on the ideXlab platform.
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A Low-Overhead Timing Monitoring Technique for Variation-Tolerant Near-Threshold Digital Integrated Circuits
IEEE Access, 2018Co-Authors: Weiwei Shan, Xinning Liu, Minyi Lu, Liang Wan, Jun YangAbstract:Near-threshold computing brings several times of magnitude improvement in energy efficiency of digital circuits. However, it also introduces several times of deteriorated delay variations caused by process, voltage and temperature (PVT) variations. In-situ timing monitoring based adaptive techniques can mitigate excessive timing margins caused by PVT variations, but current frequency and/or voltage tuning methods cause large performance loss. In this paper, we propose a low overhead timing error prediction monitor and a super-fast clock stretching circuit to solve this problem. They are both optimized for near-threshold voltage of 0.5V. When there are timing margins, the frequency will be increased. Until when the timing is intense due to variations, timing monitors will generate a predicted Alarm Signal. Accordingly, the system clock will be stretched immediately to avoid real timing errors. Applied on a 40nm CMOS Bitcoin Miner chip, simulation results show that the whole system operating at near-threshold voltage can increase the frequency to up to 2.1×compared to the original non-monitored circuit. Our method can increase the energy efficiency to mitigate near-threshold variations effectively.
Tarunraj Singh - One of the best experts on this subject based on the ideXlab platform.
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the effects of adverse condition warning system characteristics on driver performance an investigation of Alarm Signal type and threshold level
Behaviour & Information Technology, 2002Co-Authors: Nitin Gupta, Ann M Bisantz, Tarunraj SinghAbstract:This study addresses the issues concerning the design of adverse condition warning systems (ACWS). ACWS are designed to sense adverse road and weather conditions as well as system states that can negatively impact driving performance leading to skids or accidents, and alert drivers to these conditions. In this case, an ACWS was designed to sense when a car was likely to skid. A virtual-driving environment was used to test two levels of Alarm sensitivity (low and high) and two types of auditory Alarm Signal (Binary ON/OFF and Graded) along with a no-Alarm control group. Dependent measures reflected driver performance, response to the Alarm Signal and trust in the alerting system. Results indicated that participants had fewer skids in the low sensitivity and graded Alarm Signal condition compared to some other alerting system configurations. Participants in the graded Alarm Signal condition also had a greater degree of lateral control over the vehicle. Additionally, trust was found to be lower for the high ...
Qiuwu Li - One of the best experts on this subject based on the ideXlab platform.
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On-line insulator contamination monitoring system for transmission lines based on telemetry
Dianli Xitong Zidonghua Automation of Electric Power Systems, 2004Co-Authors: S Jiao, D. Liu, G. Zheng, Qiuwu LiAbstract:Based on the expounding of leakage current monitoring principle, design and realization of a kind of on-line contamination leakage current monitoring system for transmission lines are introduced. This system measures the data of the leakage current on insulator surface and temperature as well as humidity of environment online through the data acquisition unit based on the theory of the adaptive noise cancellation. The data is then transmitted to the supervision system by wireless communication, and analyzed by the expert system. When the contamination degree of insulator is serious, the system can issue Alarm Signal in time. It provides scientific foundations for plotting contamination zone correctly and realizing condition maintenances.
Janet L Gardner - One of the best experts on this subject based on the ideXlab platform.
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an avian eavesdropping network Alarm Signal reliability and heterospecific response
Behavioral Ecology, 2009Co-Authors: Robert D Magrath, Benjamin J Pitcher, Janet L GardnerAbstract:Alarm calls potentially provide information about predators to heterospecifics, but little is known about patterns of eavesdropping among species. Many cases of eavesdropping in birds and mammals involve social species in mixed-species groups, but this is not always true and the reliability of information may also be critical. We used a playback experiment and observations of natural Alarm calling to test for understanding of aerial "hawk" Alarms among 3 species of passerine and assess call reliability. Superb fairy-wrens and white-browed scrubwrens are ecologically similar and can share mixed-species flocks, whereas New Holland honeyeaters are ecologically distinct and do not flock with the other species. Fairy-wrens and scrubwrens fled to cover to each other's Alarm calls, but they also both fled to honeyeater Alarms. Honeyeaters fled to scrubwren but usually not fairy-wren Alarms. The pattern of heterospecific responses appears related to call reliability from each species' perspective. Honeyeaters called only to predators of all 3 species and so provided reliable information to all. From a honeyeater's perspective, fairy-wrens were least reliable, as they gave 52% of their calls to nonpredators, whereas scrubwrens gave only 18% to nonpredators. However, from a scrubwren's perspective, fairy-wrens were largely reliable because most calls to nonpredators were to red wattlebirds, which pose a physical threat to fairy-wrens and scrubwrens but not honeyeaters. We conclude that there can be mutual responses to Alarm calls between ecologically distinct species, that responses can be symmetrical or asymmetrical between species, and that call reliability appears to affect response. Copyright 2009, Oxford University Press.
