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Table 3 Comparison of number of the alarms for the violent opening

From: Alarm method of communication intelligent manhole cover based on multiple event fusion

Input signal Number of alarm
The existing method The proposed method
No generated alarm event of abnormal opening, Sa = 0
Single vibration 250 0
Gap vibration 438 0
Alarm event has been generated of abnormal opening, Sa = 0
Single vibration 250 31
Gap vibration 438 23