Abstract: An etchant composition is disclosed which includes hydrogen peroxide, an etch inhibitor, a chelating agent, an etch additive, an oxide semiconductor protective agent, and a pH regulator. The oxide semiconductor protective agent is included in the etchant composition by about 0.1˜3.0 wt % based on the total weight of the etchant composition. Such an etchant composition according to the present disclosure does not include any fluoride base compound and has a high pH value of about 3.5˜6. As such, the etchant composition allows an oxide semiconductor to not be etched in an etch process of copper and a molybdenum alloy. Therefore, the etchant composition can minimize faults that can be easily generated during the etching process.

Abstract: A method and apparatus for managing data written in a markup language so as to allow efficient storage, deletion, updating and retrieval of the digital data and a recording medium for storing a program designed to perform the same method. To allow efficient storage, deletion, updating and retrieval of digital data, data written in a markup language is split into fragments and each fragment is managed in a predetermined relational table. An index for the digital data based on the fragment allows the fragmented digital data to be efficiently accessible.

Abstract: A method of encrypting metadata that can be represented by a tree structure. The method involves generating an encryption key for a predetermined node of the metadata using a function that takes as input parameters an encryption key for an upper node of the predetermined node and information specifying the predetermined node, and encrypting data of the predetermined node using the generated encryption key.

Abstract: A transcoding system and method effectively synchronize segmentation metadata with A/V content when converting an MPEG stream to another format stream using a segment browser. The transcoding system includes a timing synchronizer, which adjusts the timing parameters so that the video data can be synchronized with segmentation metadata even after the transcoding process, a transcoding condition determiner, which determines transcoding conditions suitable for an end user environment, and an encoder, which compresses a video sequence reconstructed from the video data according to the transcoding conditions determined by the transcoding condition determiner and records a presentation time stamp, which is one of the adjusted timing parameters, in the compressed video sequence.

Abstract: Provided are a method and system for recommending content. The method and system enable a user to be given recommendations of contents similar to what he/she likes. The method for recommending content includes creating a user profile according to a predetermined model based on a user's reaction to the content, obtaining content features from one or more data sources, and creating a list of recommended contents according to a predetermined process based on the user profile and the content features. The system for recommending content includes a user profiling module that creates user profiles according to a predetermined model based on a user's reaction to the content, a digital television module that obtains content metadata from one or more data sources, and a content rating module that creates a list of recommended contents based on the user profile and the content metadata received from the user profiling module and the digital television module.

Abstract: A system and method for time synchronization between multimedia content and segment metadata.

Abstract: Provided is a path index lookup method, i.e., an extended markup language (XML) indexing method by which a relational database can stably process a query regardless of how a user defines the query. In the path index lookup method, a regular path expression with a certain length can be processed through a single joining operation using a PathLookup table and an ExtendedEdge table. Thus, a regular path expression query, which is a core type of XML user query, can be stably and quickly processed regardless of how a user describes the query.

Abstract: A transcoding system and method effectively synchronize segmentation metadata with A/V content when converting an MPEG stream to another format stream using a segment browser. The transcoding system includes a timing synchronizer, which adjusts the timing parameters so that the video data can be synchronized with segmentation metadata even after the transcoding process, a transcoding condition determiner, which determines transcoding conditions suitable for an end user environment, and an encoder, which compresses a video sequence reconstructed from the video data according to the transcoding conditions determined by the transcoding condition determiner and records a presentation time stamp, which is one of the adjusted timing parameters, in the compressed video sequence.

Abstract: A method and apparatus for managing data written in a markup language so as to allow efficient storage, deletion, updating and retrieval of the digital data and a recording medium for storing a program designed to perform the same method. To allow efficient storage, deletion, updating and retrieval of digital data, data written in a markup language is split into fragments and each fragment is managed in a predetermined relational table. An index for the digital data based on the fragment allows the fragmented digital data to be efficiently accessible.

Abstract: Provided are a method and system for recommending content. The method and system enable a user to be given recommendations of contents similar to what he/she likes. The method for recommending content includes creating a user profile according to a predetermined model based on a user's reaction to the content, obtaining content features from one or more data sources, and creating a list of recommended contents according to a predetermined process based on the user profile and the content features. The system for recommending content includes a user profiling module that creates user profiles according to a predetermined model based on a user's reaction to the content, a digital television module that obtains content metadata from one or more data sources, and a content rating module that creates a list of recommended contents based on the user profile and the content metadata received from the user profiling module and the digital television module.

Abstract: A system and method for time synchronization between multimedia content and segment metadata.

Abstract: A method of encrypting metadata that can be represented by a tree structure. The method involves generating an encryption key for a predetermined node of the metadata using a function that takes as input parameters an encryption key for an upper node of the predetermined node and information specifying the predetermined node, and encrypting data of the predetermined node using the generated encryption key.

Abstract: Provided is a path index lookup method, i.e., an extended markup language (XML) indexing method by which a relational database can stably process a query regardless of how a user defines the query. In the path index lookup method, a regular path expression with a certain length can be processed through a single joining operation using a PathLookup table and an ExtendedEdge table. Thus, a regular path expression query, which is a core type of XML user query, can be stably and quickly processed regardless of how a user describes the query.