Abstract: Provided is a user authentication system and method for supporting terminal mobility between user lines. The user authentication system includes: a binding checker that checks whether a user terminal ID and a circuit ID of a line currently connected to the user terminal are bound; a terminal/circuit information checker that checks whether the user terminal ID and the circuit ID are validly registered for a network service if the check result obtained by the binding checker shows that binding is not made; and a terminal authenticator that authenticates the user terminal by temporarily binding the user terminal ID and the circuit ID if the terminal/circuit information checker confirms validity of the registration. Accordingly, a pre-authenticated user terminal can receive a network service by accessing another user line. Therefore, it is possible to create various business models in which a service and a service fee system are determined according to an end user's SLA.

Abstract: Provided are an apparatus and method for modeling and analyzing a network simulation for a scalable simulation framework (SSF)-based network simulation package. A system logic set is generated and a network simulation modeling suitable for a predetermined network application is formed according to the system logic set. The network simulation modeling is transmitted to a predetermined network simulation package that performs simulation. Statistical information is generated based on the result according to the system logic set. Complicated network simulation modeling errors can be minimized, and remodeling of the network simulation modeling can be reduced.

Abstract: An optical pickup apparatus having laser light sources emit a first light beam having a relatively shorter wavelength for a DVD and a second light beam having a longer wavelength for a CD-R, an objective lens having a focal length of an information recording surface in the DVD, an optical path control unit controls the light beams so that the light beam emitted from one of the laser light sources is directed to the objective lens and the light output from the objective lens is directed to the optical detection unit, and a phase shift unit between the optical path control unit and the objective lens and which shifts a phase of the second light to reduce the size of a beam spot which is formed the information recording surface in the CD-R.