Abstract: A method is provided that includes: obtaining a list of browsed information of each of a plurality of first users and a first vector corresponding to each list of browsed information; clustering the first vectors to obtain one or more vector clusters and a center vector of each vector cluster; determining one or more information clusters respectively corresponding to the one or more vector clusters; obtaining a list of browsed information of a second user in response to a browsing request of the second user; determining, in response to determining that the list of browsed information of the second user is not void, a second vector corresponding to the list of browsed information of the second user; calculating a similarity between the second vector and each center vector, to determine an information cluster matched with the second vector; and providing recommendations for the second user based on the information cluster.

Abstract: A controllable operation-free take-out ureteral stent with a degradable coating includes a ureteral stent, a traction wire, a discharged body, and a degradable fixture, where the discharged body is fixed on one end of the traction wire, and the degradable fixture fixes the discharged body on the other end of the traction wire and is arranged close to one end of the ureteral stent within a limited period of time; the ureteral stent comprises a nondegradable base layer and a degradable coating which are sequentially arranged from inside to outside; the problem of bacterial adhesion on the surface of the ureteral stent caused by long indwelling time or patients' special allergies can be solved by automatic degradation and peeling off of the degradable coating on the surface of the ureteral stent within a certain period of time.