4,686 research outputs found
Scheme for remote implementation of partially unknown quantum operation of two qubits in cavity QED
By constructing the recovery operations of the protocol of remote
implementation of partially unknown quantum operation of two qubits [An Min
Wang: PRA, \textbf{74}, 032317(2006)], we present a scheme to implement it in
cavity QED. Long-lived Rydberg atoms are used as qubits, and the interaction
between the atoms and the field of cavity is a nonresonant one. Finally, we
analyze the experimental feasibility of this scheme.Comment: 7 pages, 2 figure
The General Characteristics of Electromagnetic Radiation During Coal Fracture and Its Application in Outburst Prediction
Coal and methane outburst are catastrophic in coal mining, their prediction is difficult. In this paper, the electromagnetic radiation (EMR) generated during coal or rock deformation and fracturing is measured and analyzed. The results show that EMR truly exists during the fracture of coal or rock (with or without the presence of gas). It follows the Hurst statistical rule, and it basically exhibits gradually enhancing tendency during the process. The EMR strength and frequency are correlated to the coal or rock fracture process. Based on the experimental and theoretical studies, a new method for coal and methane outburst prediction is proposed -the EMR method. This new method significantly facilitates methane outburst prediction
Narrow-linewidth single-frequency photonicmicrowave generation in optically injected semiconductor lasers with filtered optical feedback
A Novel Self-Supervised Learning-Based Anomaly Node Detection Method Based on an Autoencoder in Wireless Sensor Networks
Due to the issue that existing wireless sensor network (WSN)-based anomaly
detection methods only consider and analyze temporal features, in this paper, a
self-supervised learning-based anomaly node detection method based on an
autoencoder is designed. This method integrates temporal WSN data flow feature
extraction, spatial position feature extraction and intermodal WSN correlation
feature extraction into the design of the autoencoder to make full use of the
spatial and temporal information of the WSN for anomaly detection. First, a
fully connected network is used to extract the temporal features of nodes by
considering a single mode from a local spatial perspective. Second, a graph
neural network (GNN) is used to introduce the WSN topology from a global
spatial perspective for anomaly detection and extract the spatial and temporal
features of the data flows of nodes and their neighbors by considering a single
mode. Then, the adaptive fusion method involving weighted summation is used to
extract the relevant features between different models. In addition, this paper
introduces a gated recurrent unit (GRU) to solve the long-term dependence
problem of the time dimension. Eventually, the reconstructed output of the
decoder and the hidden layer representation of the autoencoder are fed into a
fully connected network to calculate the anomaly probability of the current
system. Since the spatial feature extraction operation is advanced, the
designed method can be applied to the task of large-scale network anomaly
detection by adding a clustering operation. Experiments show that the designed
method outperforms the baselines, and the F1 score reaches 90.6%, which is 5.2%
higher than those of the existing anomaly detection methods based on
unsupervised reconstruction and prediction. Code and model are available at
https://github.com/GuetYe/anomaly_detection/GLS
Assigning channel weights using an attention mechanism: an EEG interpolation algorithm
During the acquisition of electroencephalographic (EEG) signals, various factors can influence the data and lead to the presence of one or multiple bad channels. Bad channel interpolation is the use of good channels data to reconstruct bad channel, thereby maintaining the original dimensions of the data for subsequent analysis tasks. The mainstream interpolation algorithm assigns weights to channels based on the physical distance of the electrodes and does not take into account the effect of physiological factors on the EEG signal. The algorithm proposed in this study utilizes an attention mechanism to allocate channel weights (AMACW). The model gets the correlation among channels by learning from good channel data. Interpolation assigns weights based on learned correlations without the need for electrode location information, solving the difficulty that traditional methods cannot interpolate bad channels at unknown locations. To avoid an overly concentrated weight distribution of the model when generating data, we designed the channel masking (CM). This method spreads attention and allows the model to utilize data from multiple channels. We evaluate the reconstruction performance of the model using EEG data with 1 to 5 bad channels. With EEGLAB’s interpolation method as a performance reference, tests have shown that the AMACW models can effectively reconstruct bad channels
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