3,728 research outputs found
Distributed Indexing Schemes for k-Dominant Skyline Analytics on Uncertain Edge-IoT Data
Skyline queries typically search a Pareto-optimal set from a given data set
to solve the corresponding multiobjective optimization problem. As the number
of criteria increases, the skyline presumes excessive data items, which yield a
meaningless result. To address this curse of dimensionality, we proposed a
k-dominant skyline in which the number of skyline members was reduced by
relaxing the restriction on the number of dimensions, considering the
uncertainty of data. Specifically, each data item was associated with a
probability of appearance, which represented the probability of becoming a
member of the k-dominant skyline. As data items appear continuously in data
streams, the corresponding k-dominant skyline may vary with time. Therefore, an
effective and rapid mechanism of updating the k-dominant skyline becomes
crucial. Herein, we proposed two time-efficient schemes, Middle Indexing (MI)
and All Indexing (AI), for k-dominant skyline in distributed edge-computing
environments, where irrelevant data items can be effectively excluded from the
compute to reduce the processing duration. Furthermore, the proposed schemes
were validated with extensive experimental simulations. The experimental
results demonstrated that the proposed MI and AI schemes reduced the
computation time by approximately 13% and 56%, respectively, compared with the
existing method.Comment: 13 pages, 8 figures, 12 tables, to appear in IEEE Transactions on
Emerging Topics in Computin
Single-electron turnstile pumping with high frequencies
In this Letter, we present a theoretical analysis to single-electron pumping
operation in a large range of driving frequencies through the time-dependent
tunneling barriers controlled by external gate voltages. We show that the
single-electron turnstile works at the frequency lower than the characteristic
frequency which is determined by the mean average electron tunneling rate. When
the driving frequency is greater than the characteristic frequency of electron
tunnelings, fractional electron pumping occurs as an effect of quantum
coherence tunneling.Comment: 4 pages, 5 figure
Fan Control with Reduced Control Signals
Fan Control with Reduced Control Signals can be used as a cost effective method to reduce the number of noisy control signals and allow a design to support limitless system fans
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