Elevators play a crucial role in daily life, and their safety directly impacts the personal and property safety of users. To detect abnormal states of elevators and ensure people's personal safety, the acceleratio...
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Elevators play a crucial role in daily life, and their safety directly impacts the personal and property safety of users. To detect abnormal states of elevators and ensure people's personal safety, the acceleration signal of elevators is decomposed and Weiszfeld algorithm is used to estimate gravity acceleration. In addition, the study also introduces Kalman filtering to reduce error accumulation. To estimate the operating position of elevators, a method based on information fusion is studied and designed to construct a mapping relationship between elevator vibration energy and position, and to locate the height of elevator faults. Finally, an anomaly detection model combining vibration analysis and the Isolated Forest algorithm is developed. The results showed that the main distribution range of acceleration values in the horizontal direction was between 0.02 m2/s and-0.02 m2/s. The average estimation error and root mean square error of the research designed elevator position estimation method were 0.109 m and 0.113 m, respectively, which could solve the problem of accumulated position errors. The abnormal vibration energy and height corresponding to different operating conditions of elevators were different. The normal value ratios of the anomaly detection model under different sliding windows were 99.91% and 99.57%, respectively. The anomaly detection model designed for research has good performance and can provide technical support for the detection of elevator operation status.
Integer-forcing (IF) linear receiver has been recently introduced for multiple-input multiple-output (MIMO) fading channels. The integer coefficients have to be chosen based on the channel realizations, and the choice...
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ISBN:
(纸本)9781467364812
Integer-forcing (IF) linear receiver has been recently introduced for multiple-input multiple-output (MIMO) fading channels. The integer coefficients have to be chosen based on the channel realizations, and the choice of such coefficients is known to determine the receiver performance. It has been proved that Integer-forcing receiver outperforms the minimum mean square estimator (MMSE) and zero-forcing (ZF) linear receivers in MIMO. In this paper, we propose Integer-forcing receiver for Multi-Carrier Code Division Multiple Access (MC-CDMA) systems. The Integer-forcing receiving algorithm for MC-CDMA is derived. The simulation results show that the bit error rate (BER) of Integer-forcing algorithm can approach the Maximum-likelihood (ML) performance with a few decibels, and largely outperforms other linear receivers, such as MMSE and ZF.
Insider threats are among the most difficult challenges in cybersecurity, often leading to substantial losses for organizations. Insider threats remain a well-researched area of cybersecurity, with continuous developm...
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