Abstract:
PURPOSE: A method for updating a multihop remote protocol in a wireless mesh network is provided to update a mesh terminal protocol. CONSTITUTION: An agent terminal requests the setting of connection(S311,S321), and a commander terminal sets up the connection with the agent terminal. The agent terminal receives and stores a new protocol transferred from the commander terminal through the set connection(S312,S322). The agent terminal requests the release of the connection through the commander terminal(S313,S323). The commander terminal releases the connection with the agent terminal.
Abstract:
본 발명은 다중 표적을 효율적으로 추적할 수 있는 센서 네트워크 구조, 데이터 통합 방법 및 클러스터링 방법에 관한 것이다. 본 발명은 이질적으로 이루어진 센서 네트워크에서, 효율적으로 다중 표적을 추적할 수 있도록 기존 클러스터링 방식을 결합 및 상황에 따라 적응적으로 변화시키는 방법을 제공한다. 본 발명에 의해 센서 네트워크에서 에너지 소모 문제를 완화할 수 있으며, 데이터 전송량을 줄임으로써 데이터 전송 지연의 문제나 데이터 트래픽 문제를 해결할 수 있는 방법을 제공한다.
Abstract:
PURPOSE: A voice activity measuring method for a G.729 voice encoder is provided to determined optimal transmission rate for implementing each input frame for adaptive variable rate voice encoder. CONSTITUTION: The voice activity measuring method for the G.729 voice encoder includes following steps. At first, a voice frame energy value obtained during linear estimation coefficient calculation is compared with a few adaptive threshold values, the voice activity is calculated, and a sub-transmission rate corresponding to the voice activity is estimated. At the second step, numerous characteristic parameters obtained during analysis are combined to perform phonetic classification in order to verify the validity of the estimated sub-transmission rate. At the third step, variable hang-over algorithm is performed based on signal to noise ratios and the characteristic parameters so as to minimize the voice quality degeneration at the end of voice during encoding at the sub-transmission rate determined at the first and the second step. At last, a conversion to the transmission rate 1/2 is performed so as to prevent voice degeneration due to the capabilities of the voice encoders during conversion from transmission rate 1 to transmission rate 1/8 while encoding at the sub-transmission rate determined at the first through third steps.
Abstract:
PURPOSE: A hybrid clustering based data aggregation method for multi-target tracking in a wireless sensor network is provided to transmit sensing information about multiple targets to a sync node through multiple backbone nodes in order to distribute workloads to the nodes. CONSTITUTION: If the calculated number of hops is more than a first reference value, a cluster head is selected from other sensor nodes which sense a target and a temporarily constructed cluster(S705). If the calculated number of hops is smaller than a first reference value and more than a second reference value, the cluster head of a predetermined corresponding cluster(S702). Target sensing information is transmitted to the cluster head so that the cluster head integrates the target sensing information of sensor nodes which construct the cluster and transmits the information to a backbone node(S706).