Abstract: The present invention relates to a portable satellite antenna which is capable of implementing an accurate horizontal and vertical direction movement of a satellite antenna using a worm gear method and a screw type guide as a horizontal and vertical direction rotation unit of a satellite antenna and preventing an entangling phenomenon of an electric wire even when an antenna is rotated in a horizontal direction.

Abstract: The present invention provides Internet contents providers with a carrier-free authentication method for mobile terminals that use the contents of an unofficial website. The parameter attached to the URL differs each time or within a specific period of time, and moreover, differs from user to user. Therefore, by using this method, even if all the information—URL, user ID and password—should leak out to a third-party user who poses as a legitimate user, a new parameter would be sent to the fraudulent user. The moment the new parameter is sent, the former parameter becomes invalidated. The legitimate user does not know the new parameter that is now in the hands the fraudulent user. Therefore, the URL that the legitimate user accesses will contain the former parameter. When this kind of access occurs, it would be judged as a double log-in, and access by both the fraudulent and legitimate user becomes invalidated.

Abstract: Disclosed is a MP3 car player which prevents a compact disk (CD) player equipped in a car from discontinuing playing of a CD as a result of bumpy road conditions, etc., is able to use both conventional CDs and MP3 CD-ROMs, and compresses and decompresses audio data at a high compression ratio to enable the recording of 150˜200 songs in a single CD-ROM without the loss of sound quality, thereby making use of the expensive CD changer unnecessary. The present invention comprises a file type detector, an MP3 file input unit, a peripheral interface unit, a controller unit, an MP3 decoder, and a digital/analog converter.