Abstract:
A data aggregation method and data aggregation apparatus are provided. More particularly the data aggregation method includes: generating a plurality of data aggregation trees according to connection relationships between clusters that constitute a sensor network using a geographical code (GGC), selecting a single activation zone for each of the clusters which configures each of the plurality of data aggregation trees, selecting a maximum energy tree having a maximum total residual energy from the plurality of data aggregation trees, based on the single activation zone, and generating a tree list including activation zone information which corresponds to the maximum energy tree, and information about the maximum energy tree.
Abstract:
A presentation apparatus includes: a communication connection establishing unit establishing a communication connection with a plurality of receiving terminals and a source terminal, the source terminal having a token corresponding to an authority of controlling a presentation; a presentation data relay unit receiving presentation data from the source terminal, broadcasting a presentation image to the plurality of receiving terminals to display the presentation image of the received presentation data on each screen of the plurality of receiving terminals, and broadcasting voice information to the source terminal and the plurality of receiving terminals to output, from each terminal, the voice information being inputted from any one of the source terminal and the plurality of receiving terminals; and a presentation control unit controlling a transmission/reception of the presentation image and the voice information, and controlling a receiving terminal requesting the token to obtain the token.
Abstract:
A system and method for saving sensor power consumption based on context information on a wireless sensor network are provided. Basic context information is received from inside and outside of a network system including at least one sensor, wherein context information based on the basic context information is determined by inference, a group of expected services corresponding to the context information is determined, a sensor operation mode according to the group of expected services is determined, and control data is transmitted to the sensor according to the sensor operation mode. Accordingly, a sensor operation mode is adaptively determined according to changes of context information so that power consumption of a sensor can be saved.
Abstract:
Multimedia contents moving method and system. In a multimedia system including a media server for transmitting media data, at least one multimedia device for playing the media data and at least one controller for controlling the multimedia device, the method includes the steps of: sending a copy command to a first multimedia device using the controller; sending the copy command to the media server from the first multimedia device; sending a play-stop command to the first multimedia device from the multimedia server; storing a current play location of the multimedia data by the media server; sending a paste command from the controller to a second multimedia device so as for the second multimedia device to play the later part of the multimedia data which was being played by the first multimedia device, and sending the paste command from the second multimedia device to the media server; and transmitting the media data from the media server to the second multimedia device. A user can continuously use the multimedia contents using different kinds of multimedia devices by simply operating a controller while moving around, that is, moving from a place to a different place, in a home network system, even in a case where the user moves from a place to a different place.