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985 results about "Significant difference" patented technology

Significant Difference. A Significant Difference between two groups or two points in time means that there is a measurable difference between the groups and that, statistically, the probability of obtaining that difference by chance is very small (usually less than 5%).

Method And System For Monitoring Transaction Based System

1. A method for monitoring transaction based systems monitoring their system resource and transaction performance data with thresholds on metrics, said method comprising the steps of collecting system resource data and transaction performance data on a period basis and each time a transaction performance metric is passed, triggering the collection of the system resource and storing an identifier correlating the transaction performance data and the system resource data; merging the collected system resource and transaction performance data; calculating the mean value for each system resource or transaction performance metric of merged data; identifying the metrics for which there is a significant difference between mean value obtained with triggering or without triggering; according to the identified metric mean value, calculating new thresholds of system resource metrics to be used for monitoring. The steps of the method are repeated as many times as necessary for a good training of the system monitoring. Alternatively, the method can be applied to a service offering distributed environment wherein the servers collect locally monitoring data, sending it for further processing on a manager server which sends back the new resource monitoring inputs.
Owner:IBM CORP

Travelling wave analysis recognition method for thunderbolt shielding failure and counterattack discrimination of direct current transmission line

The invention relates to a traveling wave analysis and recognition method for distinguishing lightning shielding failure from lightning counterattack of direct current transmission line. The lightning shielding failure of line is that lightning avoids the lightning shield line and directly strokes on the transmission line, while lightning counterattack of line is that lightning directly strokes on the lightning shield line or the tower. Because the earth resistance of tower exists, the potential on tower top suddenly increases and causes insulation flashover. The electromagnetic transient component generation mechanism of the high voltage direct current transmission line and the propagation path of lightning electromagnetic transient of the line in the lightning shielding failure are different from those in the lightning counterattack, the size and polarity of the initial surge voltage and the second surge voltage of the voltage transient signal exist significant difference. The traveling wave analysis and recognition method of the invention analyzes zero mode voltage using wavelet and distinguishes the lightning shielding failure and lightning counterattack failure according to the size and polarity of the initial surge voltage and the second surge voltage of the zero mode voltage in the traveling wave analysis and high-speed acquisition system of the protection zone. A lot of simulation results show that the method is reliable and effect. The physical concept of the invention is visible and clear, the method is easy to achieve and wide to use in the direct current system protector, also provides accurate initial data for researching lightning characteristics, analyzing lightning accident, discussing lightning protection countermeasure of transmission line and designing insulation coordination in the power system.
Owner:KUNMING UNIV OF SCI & TECH
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