Abstract: A server according to an embodiment can collect mobility data of user terminals and group the user terminals into clusters based on the similarity the similarity of the mobility data. The server applies identification information of the clusters to which the grouped user terminals belong and previous movement paths of the grouped user terminals to a neural network-based prediction model, thus making it possible to train a prediction model to predict a base station serving moving locations of the user terminals belonging to each cluster.

Abstract: In a method for operating data analysis devices, including first data analysis devices distributed in a network and a centralized second data analysis device, according to an embodiment, the first data analysis devices collects mobility data of a user terminal from mobility management devices in the network, the second data analysis device preprocesses the mobility data, the second data analysis device applies the preprocessed mobility data to a prediction model based on a neural network and trains the prediction model to predict base stations serving a target location to which the user terminal is predicted to move by the prediction model, and the trained prediction model and identification information about the user terminal can be transferred to the first data analysis devices.

Abstract: An inkjet image forming apparatus and a method of performing a high resolution printing using multiple passes. In the inkjet image forming apparatus and a method of performing a high resolution printing, it is possible to obtain a resolution that is higher than an actual resolution of a print head by performing a printing operation several times on a printing medium in a multi-pass type printing method while moving the print head along a length direction thereof. As a result, printing quality can be improved by minimizing visibility of missing dots that occur due to failed nozzles.

Abstract: An inkjet image forming apparatus includes an ink detection unit including a light-receiving unit and a light-emitting unit facing each other. The ink detection unit is located under a printer head including several nozzles discharging the ink. The controller transmits an enable signal to the ink detection unit, so that the ink is detected by the enable signal while ink droplets enter and pass the optical signal. The ink detection unit alternately performs a first operation to detect the ink by the enable signal and a second operation to non-detect the ink.

Abstract: An inkjet image forming apparatus and a method of performing a high resolution printing using multiple passes. In the inkjet image forming apparatus and a method of performing a high resolution printing, it is possible to obtain a resolution that is higher than an actual resolution of a print head by performing a printing operation several times on a printing medium in a multi-pass type printing method while moving the print head along a length direction thereof. As a result, printing quality can be improved by minimizing visibility of missing dots that occur due to failed nozzles.