Abstract: The present invention relates to a directional flooding method in a wireless sensor network. Transfer of a packet between respective sensor nodes and a sink node in a wireless sensor network is made with the directivity. To this end, when the packet is transmitted from the sensor nodes to the sink node, only the sensor nodes having a minimum hop count for the sink node are involved in transmission of the packet. Meanwhile, if the packet is sent from the sink node to the sensor nodes within a given destination area, after the packet reaches a corresponding destination area, only sensor nodes located within the destination area transmit the packet. The present invention has an effect that it can improve energy consumed on average and a total number of packets transmitted when transmitting the packets in a wireless sensor network compared to a conventional simple flooding method.

Abstract: A method for enhanced power saving on DCF based wireless networks is disclosed. The method divides a beacon transmitting section in an Announcement Traffic Indication Message (hereinafter, referred to as “ATIM”) window period defined by IEEE standard 802.11 according as there is a data packet to be sent or not and allows a terminal that has received the beacon to go to a doze state immediately according to beacon reception timing, thereby preventing unnecessary power consumption.

Abstract: A method for power saving routing in wireless networks is disclosed. The present invention calculates a distance to a destination node to select and estimate candidate nodes so as to reduce the amount of calculations in the event of routing. Furthermore, the invention repeats the algorithm by optimum value n so that accessibility to the destination node can be obtained. This enables more efficient routing.

Abstract: A method of handling a database for bioinformatics is disclosed. A server receives a sequence to be compared and analyzed from the user terminal to store it in a queue. When there exist other sequences to be compared and analyzed, the server reads the sequence of the current order from the database to compare it with all of sequences stored in the queue. That is, the server accesses the database once to use it for all of user requests currently being processed. Because the server accesses the database only once for each user request, the average system cost and response time are decreased. Furthermore, the threshold of the user request arrival rate that can be received on the same hardware in the present invention is higher compared to the convention method, so that larger amount of users can be provided the comparison/analysis service.