Abstract: There is provided an advertising service providing method and apparatus capable of reducing a load of an advertising cost on an advertiser and increasing participation in an advertisement when providing advertising services via a wired or wireless communication network and a broadcasting network, the method including: collecting persons waiting for participating in an advertisement, determining a number of the persons, receiving a request of an advertiser for inserting an advertisement, determining a target number of advertisement participants and a target class with respect to the requested advertisement within a range of the persons, calculating an advertising cost and a total amount of winning/prize money in proportion to the determined target number of advertisement participants, providing the advertisement to the persons, the providing the advertisement is finished when a number of persons participating in the provided advertisement reaches the determined target number of advertisement participants, dete

Abstract: Disclosed herein is an acoustic diaphragm for converting electrical signals into mechanical signals to produce sounds. The acoustic diaphragm comprises carbon nanotubes or graphite nanofibers as reinforcing agents. Preferably, the carbon nanotubes or graphite nanofibers are included or dispersed in the acoustic diaphragm or coated on the surface of the acoustic diaphragm. Since the acoustic diaphragm has excellent physical properties in terms of elastic modulus, internal loss, strength and density, it can effectively achieve superior sound quality and a high output in a particular frequency band as well as in a broad frequency band.

Abstract: A music provision system having a music selection function based on human feelings, which is capable of analyzing a user's feeling on the basis of user personal information, user taste information and external information affecting the user's feeling, or a human feeling check list provided to the user, outputting the analysis results as a feeling type and feeling level and providing music corresponding to the feeling type and level. A music player having a function of recognizing a user's feeling is also disclosed herein. The music player can reproduce music corresponding to the user's feeling by itself.