A monoclonal antibody or a functional fragment thereof that binds to a human BST2 antigen existing on the cell surface and can be localized through internalization into the cell, a complex comprising the monoclonal antibody or a functional fragment thereof and a therapeutic agent, and a pharmaceutical composition comprising, as an active ingredient, the complex. The system includes a compensation unit and an exposure unit. Guided borehole waves resulting from reflection of the body wave are used to image a reflector. According to the present invention, a negative electrode carbon material for a lithium ion secondary battery which has the same quality as the prior art product can be manufactured at a low cost by making effective use of middle-grade white bran or high-grade white bran of rice.