Abstract: A mobile phone payment method and system in which a mobile phone, a photo receiver, and a control server for storing payment-related information of a user of the mobile phone, download the payment-related information of the user from the control server to the mobile phone. The payment-related information is converted into binary code data. A light signal from a backlight of the mobile phone, based on the binary code data, is transmitted to the photo receiver. The photo receiver authenticates the binary data from the received light signal and authorizes payment accordingly.

Abstract: A method for providing a connection between a client and heterogeneous database management systems, includes the steps of: a) generating a thread in response to a request message transmitted from the client; b) determining what is the request message and operating a database driver to process the request message by referring to a client information management table; and c) registering identification information of a client and a database in the client information management table and transmitting an execution result corresponding to the request message from the database driver to the client.

Abstract: A method for producing a visual rhythm in a video system, includes the steps of: a) sampling a portion of pixels contained at each of frames; and b) producing the visual rhythm summarizing changes of video contents by using the result of the sampling.