Abstract: This invention provides a device fingerprint extraction method based on smart phone sensor, which comprises the following steps: Step I: Data acquisition; Step II: Data preprocessing; Step III: ADC value recovery; Step IV: Gain matrix estimation; Step V: Validity check; Step VI: Device fingerprint ID generation. This invention can accurately extract the device fingerprint and can uniquely identify device when the device fingerprint ID doesn't change when certain devices are sampled for ex-factory setting recovery, machine upgrade and time point testing.

Abstract: The invention provides a floor determination method for terminal devices, including the steps: S1: generate the atmospheric pressure data of the datum floor; S2: divide the coordinate system of a map and establish city-level grid atmospheric pressure database; S3: add commercial label to the grid data; S4: add the datum atmospheric pressure and floor-height atmospheric pressure difference to each grid; S5: judge the floor according to the device atmospheric pressure. The advantages of this invention include: it puts forward the determination method of building floor originally and can accurately calculate the floor where the device is according to the testing data of atmospheric pressure and device sensor, and the whole process of the method is fast, intelligent and accurate.

Abstract: This invention provides an IP positioning method & unit, computer storage medium and computing device. The method includes collecting the plurality of GPS coordinates pointing to the same IP address and mapping them to one coordinate system; clustering the plurality of GPS coordinates based on the K-means clustering algorithm to acquire minimum one principal cluster circle, wherein, the GPS coordinates are the principal cluster objects of the principal cluster circles; selecting the principal cluster circle with the largest number of cluster objects as the target cluster circle; screening the target cluster object from the principal clustering objects in the target cluster circle based on the preset rules and taking the GPS coordinate of the target cluster object as the IP center coordinate of the IP address.

Abstract: This invention provides an application preference text classification method based on TextRank, including the steps as follows: generate keywords of each App according to the TextRank algorithm to form a first keywords stock; indicate a seed keyword for each sub-category according to the plurality of sub-categories; get the Apps including the seek keywords from the first keywords stock by fuzzy searching according to the seed keywords and indicate such Apps with sub-categories; conduct full calculation for the seek keywords of all Apps under the sub-categories by the TextRank algorithm and generate the second keywords stock under a plurality of sub-categories; traverse the list of Apps again and compare the contents of each keyword with the second keywords stock in the similarity of character strings; if the similarity is lower than the preset threshold, delete the association between the Apps and the current sub-categories.

Abstract: This invention provides the download system of APP, determination method of installation type and storage medium.

Abstract: This invention provides the download system of APP, determination method of installation type and storage medium.