Abstract: The subject technology receives a query, the query including a statement for performing the query. The subject technology performs a first lookup operation on a multi-phase cache based on the query. The subject technology performs, in response to a first cache miss of the multi-phase cache, parsing of the statement from the query. The subject technology performs, based on the parsing, a compilation process on the query to generate a compiled query plan, the compilation process determining an optimization and a generalization for the query. The subject technology determines that the compiled query plan is cacheable. The subject technology registers, in response to the compiled query plan being cacheable, a dummy entry in the multi-phase cache.

Abstract: A method of target feature extraction and multi-target tracking based on 4D millimeter wave radar includes acquiring the point cloud data output from the radar and preprocess the point cloud data to eliminate the outlier value; processing the points acquired after preprocessing by Density-Based Spatial Clustering of Applications with Noise (DBSCAN) clustering; processing each of the acquired clusters for target feature extraction; predicting the existing trajectory is predicted, and the prediction results are globally correlated with the clustering results; based on the correlation clustering results, the corresponding multi-target tracking motion state processing is executed to obtain the transverse pendulum angular velocity; and based on the target motion state, the target size information as well as the heading angle information are updated.

Abstract: A method of target feature extraction and multi-target tracking based on 4D millimeter wave radar includes acquiring the point cloud data output from the radar and preprocess the point cloud data to eliminate the outlier value; processing the points acquired after preprocessing by Density-Based Spatial Clustering of Applications with Noise (DBSCAN) clustering; processing each of the acquired clusters for target feature extraction; predicting the existing trajectory is predicted, and the prediction results are globally correlated with the clustering results; based on the correlation clustering results, the corresponding multi-target tracking motion state processing is executed to obtain the transverse pendulum angular velocity; and based on the target motion state, the target size information as well as the heading angle information are updated.

Abstract: A method of sparse array oriented approach for DOA estimation of grating lobe target filtering includes sub-array division processing of received echoes in multiple channels; digital beamforming is performed on each sub-array obtained after division to realize DOA estimation; the echo power of the beam pointing at each angle is calculated and the peak point is detected; peak threshold discrimination processing is performed based on the determined peak threshold; if the current sub-array satisfies the identified peak threshold, the corresponding power spectrum extreme is calculated to obtain the final DOA estimation. The present invention also relates to a corresponding device, processor and computer-readable storage medium thereof.

Abstract: A method and system for establishing an Internet Protocol (IP) connection between mobile terminals and a mobile terminal for establishing an IP connection are disclosed. The method includes: a request terminal sending a request short message to a called terminal; the called terminal getting the program name by parse, searching out a corresponding end-to-end program in an end-to-end program list and displays it to a user after the request short message is detected and the user chooses to receive the short message; the end-to-end program of the called terminal sending a network connection request after the user starts the end-to-end program and inputs the IP address of the short message text; the end-to-end program of the request terminal performing an IP-based data interaction with the called terminal when the network connection request is monitored. This technical solution can establish an end-to-end IP connection between two mobile terminals rapidly and conveniently.

Abstract: The disclosure discloses a method for adjusting a mobile terminal browser, which comprises setting an upper threshold value and a lower threshold value of a downloading speed for a mobile terminal browser. The method further comprises: calculating a current average downloading speed of the mobile terminal browser; comparing the current average downloading speed with the upper threshold value and the lower threshold value of the downloading speed; resetting network parameters of the mobile terminal browser when the current average downloading speed is less than the lower threshold value of the downloading speed or greater than the upper threshold value of the downloading speed. The disclosure also discloses a mobile terminal.

Abstract: A method and system for establishing an Internet Protocol (IP) connection between mobile terminals and a mobile terminal for establishing an IP connection are disclosed. The method includes: a request terminal sending a request short message to a called terminal; the called terminal getting the program name by parse, searching out a corresponding end-to-end program in an end-to-end program list and displays it to a user after the request short message is detected and the user chooses to receive the short message; the end-to-end program of the called terminal sending a network connection request after the user starts the end-to-end program and inputs the IP address of the short message text; the end-to-end program of the request terminal performing an IP-based data interaction with the called terminal when the network connection request is monitored. This technical solution can establish an end-to-end IP connection between two mobile terminals rapidly and conveniently.

Abstract: The disclosure discloses a method for adjusting a mobile terminal browser, which comprises setting an upper threshold value and a lower threshold value of a downloading speed for a mobile terminal browser. The method further comprises: calculating a current average downloading speed of the mobile terminal browser; comparing the current average downloading speed with the upper threshold value and the lower threshold value of the downloading speed; resetting network parameters of the mobile terminal browser when the current average downloading speed is less than the lower threshold value of the downloading speed or greater than the upper threshold value of the downloading speed. The disclosure also discloses a mobile terminal.

Abstract: A Binary Runtime Environment for Wireless (BREW) service download system and an implementation method thereof is provided in the present invention, wherein the implementation method comprises the following steps: a mobile terminal accesses a BREW service download website provided by a WWW/WAP server (S10); the WWW/WAP server generates a web page of the BREW service download website according to a User Agent Profile (UA Profile) of the mobile terminal (S20); and the mobile terminal downloads a BREW service in the web page (S30). According to the technical solution provided by the present invention, WWW/WAP websites can be used to display and introduce the downloadable contents to the users in a more detailed and more vivid graphic and text manner so as to attract the users to download and purchase, thereby improving the profits of the operators and service developers.