Method for verifying bad pattern in time series sensing data and apparatus thereof
First Claim
1. A method for verifying a bad pattern in sensing data, the method comprising:
- receiving bad pattern information applied to sensing data measured by a sensor;
accessing the sensing data of each product, generated by the sensor;
calculating similarity measures between the bad pattern based on the bad pattern information and the accessed sensing data; and
calculating an error rate of the bad pattern based on the similarity measures,wherein the calculating of the error rate of the bad pattern comprises;
querying information of each product; and
calculating the error rate of the bad pattern by comparing the information with at least one of the calculated similarity measures,wherein the calculating the similarity measures between the bad pattern based on the bad pattern information and the accessed sensing data comprises calculating a first similarity measure between the bad pattern based on the bad pattern information and the sensing data according to a first standard and a second similarity measure between the bad pattern based on the bad pattern information and the sensing data according to a second standard,wherein each of the first and second similarity measures have a value in a range between 0, which means non-similarity, and 1, which means sameness, andwherein the calculating of the bad pattern error rate comprises;
when one or more of the first and second similarity measures of a particular product have a value 1 and the particular product is determined as a good product based on the information, selecting the particular product as an error case of the bad pattern information; and
calculating the error rate based on a number of error cases.
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Abstract
A method for verifying bad pattern in time series sensing data by calculating a bad pattern error rate, which can be applied to the time series sensing data measured and produced from a predetermined sensor provided in predetermined equipment, and an apparatus thereof are provided. The method includes receiving information on the bad pattern applied to time series sensing data measured by a suspicious sensor, accessing the time series sensing data of each product, generated by the suspicious sensor during a verification period, calculating similarity measures between the bad pattern based on the bad pattern information and the time series sensing data for each product, and calculating an error rate of the bad pattern based on the similarity measures.
14 Citations
12 Claims
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1. A method for verifying a bad pattern in sensing data, the method comprising:
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receiving bad pattern information applied to sensing data measured by a sensor; accessing the sensing data of each product, generated by the sensor; calculating similarity measures between the bad pattern based on the bad pattern information and the accessed sensing data; and calculating an error rate of the bad pattern based on the similarity measures, wherein the calculating of the error rate of the bad pattern comprises; querying information of each product; and calculating the error rate of the bad pattern by comparing the information with at least one of the calculated similarity measures, wherein the calculating the similarity measures between the bad pattern based on the bad pattern information and the accessed sensing data comprises calculating a first similarity measure between the bad pattern based on the bad pattern information and the sensing data according to a first standard and a second similarity measure between the bad pattern based on the bad pattern information and the sensing data according to a second standard, wherein each of the first and second similarity measures have a value in a range between 0, which means non-similarity, and 1, which means sameness, and wherein the calculating of the bad pattern error rate comprises; when one or more of the first and second similarity measures of a particular product have a value 1 and the particular product is determined as a good product based on the information, selecting the particular product as an error case of the bad pattern information; and calculating the error rate based on a number of error cases. - View Dependent Claims (2, 3, 4)
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5. A method for verifying a bad pattern in sensing data, the method comprising:
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receiving bad pattern information applied to sensing data measured by a sensor; accessing the sensing data of each product, generated by the sensor; calculating similarity measures between the bad pattern based on the bad pattern information and the accessed sensing data; and calculating an error rate of the bad pattern based on the similarity measures, wherein the calculating of the similarity measures comprises; obtaining a first array of the accessed sensing data; and
calculating the similarity measures between a second array of the bad pattern information and the obtained first array,wherein the obtaining further comprises; dividing a time axis of the accessed sensing data into a predetermined number of sections, calculating representative values of measured values for each divided section, and storing the calculated representative values of the measured values; normalizing the stored representative values using a mean and a variance of the stored representative values; and converting the accessed sensing data into the first array by providing symbols allocated to each of the normalized representative values for each section. - View Dependent Claims (6, 7)
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8. An apparatus for verifying a bad pattern in sensing data, the apparatus comprising:
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a verification parameter receiving unit configured to receive verification parameters including information on the bad pattern applied to sensing data of a sensor and information on a verification method; a sensing data extracting unit configured to access the sensing data of each product, generated by the sensor based on verification method information; a similarity measure calculating unit configured to calculate similarity measures between the bad pattern based on the bad pattern information and the sensing data, for each product; a bad pattern verification unit configured to calculate an error rate of the bad pattern based on the similarity measures; and a pre-processing unit configured to receive the sensing data of each product from the sensing data extracting unit, apply a pre-processing process to the sensing data of each product and supply the pre-processed data to the similarity measure calculator, wherein the pre-processing unit comprises; a sensor data division &
compression module configured to divide a time axis of the sensing data of each product into a predetermined number of sections, calculate representative values of sensing data for each divided section, and store the calculated representative values;
a normalization module configured to normalize the stored representative values using a mean and a variance of the stored representative values; anda SAX conversion module SAX (Symbolic Aggregate approXimation) configured to convert the sensing data of each product into a first array by providing symbols allocated to each of the normalized representative values for each section and supplying the SAX converted data to the similarity measure calculator. - View Dependent Claims (9, 10, 11, 12)
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Specification