Abstract:
In a sensor network including a sink node and a plurality of sensor nodes, the sink node receives a routing message including routing information from the sensor nodes, analyzes a structure of the sensor network based on routing information, and calculates a transmission schedule of each sensor node based on the analyzed network structure. Schedule information according to the calculated transmission schedule includes a wakeup time of the sensor node, a time interval that is consumed for packet transmission, and a standby time for preventing a packet collision based on the time interval.
Abstract:
Disclosed herein are a telephone, a switchboard, and a method for sending a message between the telephone and the switchboard using a Dual Tone Multiple Frequency (DTMF) signal. The telephone includes a sensor interface unit for collecting sensing signals by being connected to sensors, a transmission unit for generating a message using the sensing signals, converting the message into a DTMF signal, and transmitting the DTMF signal and a telephone signal, and a power distribution unit for being supplied with power from the switchboard and distributing the power to operation units.
Abstract:
Provided herein is a harmful material prediction system including a harmful material feature collecting unit configured to collect harmful material features of food; a preprocessing unit configured to preprocess the harmful material features collected and generate harmful material information of an analyzable format; and a Hadoop-based dispersed cluster configured to generate a similarity group where similarity base points are grouped based on a correlation per variable included in the harmful material information, thereby predicting in real time the harmful materials over the overall phases of distribution.
Abstract:
Disclosed herein are an apparatus and method for managing the locations of service equipment for a plant factory. The apparatus includes a sensor registration management unit, a sensor ID issuance unit, and a location registration management unit. The sensor registration management unit performs a registration procedure that registers with a sensor network a plurality of service devices and sensors that are installed in the plant factory. The sensor ID issuance unit issues sensor IDs to the plurality of service devices and sensors registered with the sensor network, respectively. The location registration management unit performs a location registration procedure that registers information about the locations of the plurality of service devices and sensors based on the issued sensor IDs.
Abstract:
Provided is a private electric generator including: a first heat absorbing panel that absorbs heat corresponding to temperature; a second heat absorbing panel that absorbs heat corresponding to ground temperature or water temperature; and a thermoelectric generator that is disposed between the first and second heat absorbing panels and uses a temperature difference in the heat absorbed in the first and second heat absorbing panels to generate power, thereby generating power based on a difference in temperature and ground temperature or water temperature according to a daily temperature range.