Electronics and Telecommunications Research Institute

Yoon-Mee Doh

Cheol-Sig Pyo

Se-Han Kim

Jong-Suk Chae

Yong-Sun Kim

Hyun Woo Lee

Woo-Yong Lee

Gil-Young Choi

Hae-Won Son

Jae-Young Jung

Jun-Ho Yeo

Provided is a method for managing dormant nodes in a wireless sensor network. The method includes the steps of: a) acquiring and storing information on distance and location of sensor nodes registered in a corresponding cluster among at least one cluster managed by a managing node; b) selecting a dormant object node among the sensor nodes by the managing node; c) transmitting dormant information that the dormant object node should go into a dormant state for a predetermined period through a beacon message to the dormant object node and creating a dormant node management table; and d) updating a dormant time of the dormant node management table every beacon cycle by the managing node according to setup of a dormant time central managing function and notifying dormancy expiration to the corresponding dormant node.

Method for managing dormant nodes in wireless sensor network

Provided is a method for buffering a receive packet in a sensor node including a radio frequency (RF) transceiver, a media access control (MAC) hardware block and a micro controller unit (MCU). The method includes the steps of: a) if a packet is received from the RF transceiver, checking whether or not a packet which is pre-stored in a receive first in first out (FIFO) exists; b) if the pre-stored packet exists in the receive FIFO at step a), checking whether a length of the received packet is the same with the length of the pre-stored packet in the receive FIFO; c) if the length of the received packet is the same with the length of the pre-stored packet in the receive FIFO at the step b), increasing the number of packet which is included in header information, and buffering a physical payload in the receive FIFO; and d) if the pre-stored packet does not exist in the receive FIFO at the step a) nor the length of the received packet is the same with the length of the pre-stored packet in the receive FIFO, consecutively buffering the physical payload with the header in the receive FIFO.

Method for buffering receive packet in media access control for sensor network and apparatus for controlling buffering of receive packet

Provided is a distributional alert system using a ubiquitous sensor network (USN). When a disaster occurs, the distributional alert system detects it in a sensor node, informs the area where the disaster occurs of danger through an actuator, such as siren, or informs a management system of the danger through a wired/wireless network. The distributional alert system includes: a first sensor node for generating sense data by sensing surroundings with a sensor therein, determining whether a disaster occurs by analyzing the sense data, and creating and transmitting emergency data based on the determination result, while forming a sensor network; and an alerting node for receiving emergency data from the first sensor node on the sensor network, and outputting disaster circumstantial information to a sensor field of the sensor network upon receipt of the emergency data.

Distributional alert system for disaster prevention utilizing ubiquitous sensor network

Provided is a data storing apparatus and method for Radio Frequency Identification (RFID) tags with sensors. The apparatus includes: a first storing block which includes a kill password storage and an access password storage; a second storing block which includes an Electronic Product Code (EPC) storage, a protocol control storage, and an error check storage storing a Cyclic Redundancy Checking (CRC) code for detecting a transmission error; a third storing block which includes a tag identifier storage storing a tag identifier including a manufacture model and a serial number of the tag; and a fourth storing block which includes an initial sensor data storage storing initial information of the sensor, a real-time information storage, a maximum/minimum data storage storing maximum/minimum values, a sensor data storage storing sensing data actually measured through the sensor embedded in the RFID tag.

Data storing apparatus and method for RFID tags with sensors

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Daejon, South Korea

Yoon-Mee Doh