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Data sharing method of industrial internet of things based on federal incremental learning
Jing LIU, Zhihong DONG, Zheyu ZHANG, Zhigang SUN, Haipeng JI
Journal of Computer Applications    2022, 42 (4): 1235-1243.   DOI: 10.11772/j.issn.1001-9081.2021071182
Abstract411)   HTML20)    PDF (763KB)(291)       Save

In view of the large amount of new data in the Industrial Internet Of Things(IIOT) and the imbalance of data at the factory sub-ends, a data sharing method of IIOT based on Federal Incremental Learning (FIL-IIOT) was proposed. Firstly, the industry federation model was distributed to the factory sub-end as the local initial model. Then, the federal sub-end optimization algorithm was proposed to dynamically adjust the participating subset. Finally, the incremental weight of the factory sub-end was calculated through the federal incremental learning algorithm, thereby integrating the new state data with the original industry federation model quickly. Experimental results the Case Western Reserve University (CWRU) bearing failure dataset show that the proposed FIL-IIOT makes the accuracy of bearing fault diagnosis reached 93.15%, which is 6.18 percentage points and 2.59 percentage points higher than those of Federated Averaging (FedAvg) algorithm and FIL-IIOT of Non Increment (FIL-IIOT-NI) method, respectively. The proposed method meets the needs of continuous optimization of industry federation model based on industrial incremental data.

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Power data analysis based on financial technical indicators
An YANG, Qun JIANG, Gang SUN, Jie YIN, Ying LIU
Journal of Computer Applications    2022, 42 (3): 904-910.   DOI: 10.11772/j.issn.1001-9081.2021030447
Abstract295)   HTML7)    PDF (785KB)(88)       Save

Considering the lack of effective trend feature descriptors in existing methods, financial technical indicators such as Vertical Horizontal Filter (VHF) and Moving Average Convergence/Divergence (MACD) were introduced into power data analysis. An anomaly detection algorithm and a load forecasting algorithm using financial technical indicators were proposed. In the proposed anomaly detection algorithm, the thresholds of various financial technical indicators were determined based on statistics, and then the abnormal behaviors of user power consumption were detected using threshold detection. In the proposed load forecasting algorithm, 14 dimensional daily load characteristics related to financial technical indicators were extracted, and a Long Shot-Term Memory (LSTM) load forecasting model was built. Experimental results on industrial power data of Hangzhou City show that the proposed load forecasting algorithm reduces the Mean Absolute Percentage Error (MAPE) to 9.272%, which is lower than that of Autoregressive Integrated Moving Average (ARIMA), Prophet and Support Vector Machine (SVM) algorithms by 2.322, 24.175 and 1.310 percentage points, respectively. The results show that financial technical indicators can be effectively applied to power data analysis.

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Particle swarm optimization algorithm based on Gaussian disturbance
ZHU Degang SUN Hui ZHAO Jia YU Qing
Journal of Computer Applications    2014, 34 (3): 754-759.   DOI: 10.11772/j.issn.1001-9081.2014.03.0754
Abstract722)      PDF (836KB)(506)       Save

As standard Particle Swarm Optimization (PSO) algorithm has some shortcomings, such as getting trapped in the local minima, converging slowly and low precision in the late of evolution, a new improved PSO algorithm based on Gaussian disturbance (GDPSO) was proposed. Gaussian disturbance was put into in the personal best positions, which could prevent falling into local minima and improve the convergence speed and accuracy. While keeping the same number of function evaluations, the experiments were conducted on eight well-known benchmark functions with dimension of 30. The experimental results show that the GDPSO algorithm outperforms some recently proposed PSO algorithms in terms of convergence speed and solution accuracy.

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TOA estimation of UWB based on PCA
Chun-Ling Tang Guo-Qiang Xiao Ming-Gang Sun
Journal of Computer Applications   
Abstract1618)            Save
An algorithm based on PCA(Principal Component Analysis) was presented for estimation of signal arrival time in UWB system. This algorithm analyzed the signal eigenvectors of the correlation matrix for the received signal associated with noise components, and then the received signal was projected to every signal eigenvector to get the sum of the projections. Selecting a threshold with low complexity and sampling rate, estimate precision between Multiscale Energy Products (MEP) and the proposed method was compared. Simulation results show that the probability of estimated mean absolute error which is less than 12cm exceeds 90% in the proposed method and that of MEP is lower than 45%.
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