Abstract: The method performed by an apparatus for managing content including: receiving, from a user terminal, a content and a user tag, checking an upper level tag corresponding to the received user tag by referring to a database, the databased configured to a list of one or more levels of a plurality of upper level tags and a plurality of user tags, registering the content and the received user tag, assigning the received user tag as a general tag of the content, and assigning one of the upper level tags corresponding to the received user tag as a hidden tag of the content may be provided.

Abstract: A plasma display panel includes a substrate with electrodes. A dielectric layer is disposed over the substrate and covers the electrodes. The dielectric layer includes 10 to 60 mol % of Bi2O3, 5 to 40% of CuO, and 15 to 40 mol % of B2O3.

Abstract: A glass composition for a plasma display panel (PDP) and its fabrication method are disclosed. The composition, including a ZnO—B2O3 group and alkaline earth metal oxide, is environment-friendly, has a high discharge efficiency and is used as various PDP dielectric materials. The fabrication method allows to compose the low melting point unleaded non-alkali glass composition at a low cost.

Abstract: In a plasma display panel which is capable of improving colorimetric purity without lowering light efficiency by selectively filtering only visible light of request color, a plasma display panel includes a filter including a grating layer having plural gratings for diffracting lights generated in a plasma display panel at a certain angle and a black matrix layer for transmitting or cutting off the lights diffracted by the grating layer.

Abstract: An apparatus and a method for orienting an antenna to a transmitter, and an antenna using the apparatus are disclosed. The apparatus for orienting an antenna toward a transmitter, which is used with an antenna, comprises a shadow generating means fixedly mounted to the antenna so as to generate a shadow of the sun, and target indicating means for specifying a target point on a reflector, at which a predetermined portion of the shadow generated by the shadow generating means should be positioned when the antenna is correctly oriented toward the transmitter.

Abstract: In a plasma display panel which is capable of improving colorimetric purity without lowering light efficiency by selectively filtering only visible light of request color, a plasma display panel includes a filter including a grating layer having plural gratings for diffracting lights generated in a plasma display panel at a certain angle and a black matrix layer for transmitting or cutting off the lights diffracted by the grating layer.