8,462 research outputs found
A Multi Hidden Recurrent Neural Network with a Modified Grey Wolf Optimizer
Identifying university students' weaknesses results in better learning and
can function as an early warning system to enable students to improve. However,
the satisfaction level of existing systems is not promising. New and dynamic
hybrid systems are needed to imitate this mechanism. A hybrid system (a
modified Recurrent Neural Network with an adapted Grey Wolf Optimizer) is used
to forecast students' outcomes. This proposed system would improve instruction
by the faculty and enhance the students' learning experiences. The results show
that a modified recurrent neural network with an adapted Grey Wolf Optimizer
has the best accuracy when compared with other models.Comment: 34 pages, published in PLoS ON
Image Processing with Dipole-Coupled Nanomagnets: Noise Suppression and Edge Enhancement Detection
Hardware based image processing offers speed and convenience not found in
software-centric approaches. Here, we show theoretically that a two-dimensional
periodic array of dipole-coupled elliptical nanomagnets, delineated on a
piezoelectric substrate, can act as a dynamical system for specific image
processing functions. Each nanomagnet has two stable magnetization states that
encode pixel color (black or white). An image containing black and white pixels
is first converted to voltage states and then mapped into the magnetization
states of a nanomagnet array with magneto-tunneling junctions (MTJs). The same
MTJs are employed to read out the processed pixel colors later. Dipole
interaction between the nanomagnets implements specific image processing tasks
such as noise reduction and edge enhancement detection. These functions are
triggered by applying a global strain to the nanomagnets with a voltage dropped
across the piezoelectric substrate. An image containing an arbitrary number of
black and white pixels can be processed in few nanoseconds with very low energy
cost
Scanning optical homodyne detection of high-frequency picoscale resonances in cantilever and tuning fork sensors
Higher harmonic modes in nanoscale silicon cantilevers and microscale quartz
tuning forks are detected and characterized using a custom scanning optical
homodyne interferometer. Capable of both mass and force sensing, these
resonators exhibit high-frequency harmonic motion content with picometer-scale
amplitudes detected in a 2.5 MHz bandwidth, driven by ambient thermal
radiation. Quartz tuning forks additionally display both in-plane and
out-of-plane harmonics. The first six electronically detected resonances are
matched to optically detected and mapped fork eigenmodes. Mass sensing
experiments utilizing higher tuning fork modes indicate >6x sensitivity
enhancement over fundamental mode operation.Comment: 3 pages, 3 figures, submitted to Applied Physics Letter
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