Abstract: A method and system for detecting frequent lane changes of moving vehicles are disclosed. A method for detecting frequent lane changes of moving vehicles including extracting the Z axis angular velocity values, and storing those Z axis angular velocities, from the Z axis angular velocity of which numerical product is negative, analyzing the Z axis angular velocities stored in the specific time period, and judging the number of the Z axis angular velocities with the numeral number 0. It is determined whether the vehicle has made frequent lane changes or not in its moving process, so that an active monitoring for vehicle travelling statuses is implemented, thereby normalizing driving behaviors, and reducing traffic accidents.

Abstract: The present invention provides a method and device for organizing and restoring file indexes, which belongs to a technical field of data storing methods. In the present invention, a circular bidirectional linked list is constituted by all files in a storage medium firstly, wherein the bidirectional linked list comprises a forward linked list and a backward linked list; the indexes of all files are stored in an index information set, and each file is provided therein with a backup of its corresponding index; afterwards, in the process of accessing of a file, if the index of the file in the index information set doesn't match with the backup of the index of the file, the bidirectional linked list is restored; finally, the indexes of all files are re-established according to the restored bidirectional linked list. By using the method and device for organizing and restoring file index of the present invention, an efficiency of file index reestablishment can be improved.

Abstract: The present invention belongs to the technical field of electronics, and provides a method and system for detecting frequent lane changes of moving vehicles. The method for detecting frequent lane changes of moving vehicles comprises following steps: extracting Z axis angular velocities, the Z axis angular velocities are those Z axis angular velocities in triaxial angular velocities obtained by a sensor of a vehicle in a moving process of the vehicle; if a Z axis angular velocity of which an adjacent numerical product is negative occurs in the Z axis angular velocities, storing the Z axis angular velocities in a specific time period; if the number of Z axis angular velocities with a numeral value of 0 in the specific time period reaches a first threshold value, judging that the vehicle has made frequent lane changes in the specific time period.

Abstract: The present invention provides a method and device for restoring system file indexes, which belongs to the technical field of data store methods. In the present invention, when a storage medium is loaded and an index information set is not read, or when the storage medium is loaded and the indexes in the index information set are judged to be incorrect, or when a read operation is executed for a file in the storage medium and an index of the file in the index information set doesn't correspond to a backup index in the file, or when a writing operation is executed for a file in the storage medium and an index of the file in the index information set doesn't correspond to a backup index in the file, the backup indexes of all files in the storage medium are updated, and the index information set is restored or re-established. By using the method and device for restoring system file indexes of the present invention, a deficiency of repeated restarts without recording is overcome.