Abstract: A positive electrode active material for a secondary battery includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein the lithium composite transition metal oxide has a layered crystal structure of space group R3m, includes the nickel (Ni) in an amount of 60 mol % or less based on a total amount of transition metals, includes the cobalt (Co) in an amount greater than an amount of the manganese (Mn), and is composed of single particles.

Abstract: A method for selecting traffic channels of a mobile telecommunication base station is disclosed. Normal traffic channel elements and busy traffic channel elements are calculated and compared with each other, and a judgment is made as to whether there is a usable traffic channel element. Busy traffic channel elements of respective shelves are compared with each other to select a shelf having smallest busy traffic channel elements. Busy traffic channel elements of the selected shelf are compared with normal traffic channel elements of the same shelf, to judge as to whether there is a usable traffic channel element. A termination condition is incremented by 1 upon finding a usable traffic channel element, and a judgment is made as to whether the selected shelf index is smaller than a last shelf index. The channel card index is updated, and the self index is incremented by 1 upon finding the selected shelf index to be smaller than a last, and confirming the sequential selected shelf index.