Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.

Abstract: A semiconductor memory includes metallic lines on a substrate and including an uppermost metallic line, a semiconductor conduction line on the uppermost metallic line, a vertical structure penetrating the semiconductor conduction line and metallic lines, and including a vertical structure that includes an upper channel film, a first lower channel film, and an upper connection channel film connecting the upper channel film and the first lower channel film between a bottom of the semiconductor conduction line and a bottom of the uppermost metallic line, and a first cutting line through the metallic lines and the semiconductor conduction line, and including a first upper cutting line through the semiconductor conduction line, and a first lower cutting line through the plurality of metallic lines, a width of the first upper cutting line being greater than a width of an extension line of a sidewall of the first lower cutting line.

Abstract: The present invention relates to a multi-component host material and an organic electroluminescent device comprising the same. By comprising a specific combination of the multi-component host compounds, the organic electroluminescent device according to the present invention can provide high luminous efficiency and excellent lifespan characteristics.

Abstract: The present disclosure relates to an organic electroluminescent device. The organic electroluminescent device of the present disclosure shows high luminous efficiency and good lifespan by comprising a specific combination of the plural kinds of host compounds and a specific hole transport compound.

Abstract: There is provided a system for providing advertisements in connection with tags of user-created content. The system includes: a request receiving unit configured to receive a request for user-created content from a client terminal, wherein the user-created content includes non-text information; a content reading unit configured to read the user-created content according to the received request; a tag retrieval unit configured to retrieve tags of the read user-created content; an advertisement searching unit configured to search advertisements connected to the retrieved tags; and a transmission unit configured to transmit the read user-created content and the searched advertisements to the client terminal. When using the above system, it is possible to provide advertisements having higher relevancy with the content. Further, it is possible to provide advertisements having relevancy with even the content that includes the non-text information.

Abstract: A method and system for providing regional information based on location is disclosed. In accordance with the present invention, a user inputs a keyword, from which a target location and a search category are extracted. A location range for search is determined by setting a center of the location range to the target location. Search result data are retrieved from a search information database based on the search category and the location range. The location range may be increased or decreased in response to a user's request, based on which the search result data are updated. The apparatus and method of the present invention provides search results ranked within a certain geographical range from a target location, which makes it possible for a specific location-based business to advertise through an Internet search service in a cost-effective way.