Abstract: A social network system for resource sharing, and a method for the establishment and maintenance of same are provided. According to the present invention, the social network system for resource sharing includes: a plurality of entities constituting a social network; a sharing resource owned by at least one entity of the plurality of entities; a trust strength for representing the degree of trust in a relationship, which is formed in a unilateral or bilateral way between each of the entities in order to share the resource; and a communication protocol for sharing the resource among the plurality of entities. The trust strength is classified into a plurality of classes. Each of the entities grants a different access right to another entity according to each of the classes.

Abstract: A clamp signal generation-control circuit includes a clamp signal controller for discriminating the existence of a sync on green signal and a separate sync signal supplied from a video card to a monitor to output a control signal according to the discrimination, and a clamp signal generator for automatically changing a generated point of the clamp signal, and a method for controlling the circuit is also provided. The generated point of the clamp signal supplied to the monitor is controlled to automatically shift the clamping position of a video signal, thereby preventing malfunction caused by a nonprofessional user's manipulation, abnormal picture display or the generation of a segment phenomenon. The circuit is adoptable to monitors supplied with various kinds of sync signals.

Abstract: A convergence correcting device is disclosed in which a first correcting element varies an inductance of horizontal correcting coils so as to correct a misconvergence in a saturable region of a flux generated according to the horizontal correcting coils of the saturable reactor, and the second correcting element corrects a misconvergence by increasing a flux density at the vertical side of the saturable reactor after focusing magnetic fields generated from vertical correcting coils and the magnet.