Abstract: Provided are a communication method and system for sensor network. In reporting event occurrence in a real-time sensor network application, a cycle time is divided into an event announcement period and a data transmission period to provide real-time transmission performance and energy efficiency. Each of the periods is again divided into the number of slots equal to the maximum depth of a network. Respective nodes sequentially operate according to their depths in a routing tree during the event announcement period to receive the signal transmitted from the lower node. To remove sleep delay, a slot next to the signal reception slot becomes a signal transmission slot. A node sensed an event transmits a signal informing event occurrence during its signal transmission slot, and this signal includes only the address of the transmission node. When a signal does not exist in the event announcement period, no traffic occurs in the data transmission period and the upper nodes maintain a sleep state.

Abstract: Disclosed is a method of preventing overlap of multiple PANs in a ZigBee network. According to the method of preventing overlap of multiple personal area networks (PANs) in the ZigBee network, a first node included in a first PAN of the ZigBee network verifies whether overlap of the multiple PANs occurs by verifying packets received from neighbor nodes, identifies beacon information of a neighbor node that causes the overlap of the multiple PANs by gradually adjusting radio frequency (RF) transmission wave, and adjusts a communication range based on the beacon information.

Abstract: A low-power method for media access control on a semi-linear sensor network with multiple sensor nodes, includes: sensing a channel after waking up from a sleep mode by an arbitrary transmission sensor node that has obtained data; and generating a long preamble including a number of element preambles and sending to a destination sensor node after said channel sensing. This method further includes: sending said data to said destination sensor node after completion of transmission of said long preamble; and identifying duty cycle information of said destination sensor node after completion of transmission of said data and adjusting the number of said element preambles according to said duty cycle information.

Abstract: Provided are an energy-efficient communication method in a group information-based sensor network and a sensor network system using the method. A group exchanges group information and data with another group in order to provide an application service through inter-group cooperation in a sensor network. In this process, a target group is discovered, a communication path is established, and inter-group communication cycle information for energy-efficient communication is transmitted. On the basis of the group information and the communication cycle information, it is possible to minimize the network resource consumption and provide an energy-efficient inter-group communication method.

Abstract: An energy control apparatus and method using a usage property of an electronic device. The energy control method may include: setting a total power consumption to be less than a predetermined threshold; verifying a usage property for each electronic device when a collected total power consumption exceeds the threshold; calculating a scheduled end time based on the average usage time of each remaining electronic device excluding, from among operating devices, an electronic device of which power-off is unavailable; verifying a remaining electronic device excluding an electronic device of which scheduled end time is less than the threshold; controlling a temporarily stoppable electronic device to be temporarily stopped; controlling a power adjustable electronic device to decrease a power consumption when the total power consumption exceeds the threshold; and starting the temporarily stopped electronic device at a point in time when the total power consumption decreases to be less than the threshold.

Abstract: Provided are a sensor node of a low power for a monitoring application in a mesh sensor network using a time division access scheme, and a routing method thereof. The routing method of the sensor node may include: transmitting a beacon containing routing information to neighboring nodes in a first time slot within a first beacon interval that is allocated to the sensor node; and receiving a beacon from each of the neighboring nodes in a second time slot within a second beacon interval that is allocated to each of the neighboring nodes.

Abstract: The present invention relates to a method and system for communication in an application field that may communicate with a sensor or a computer incorporated in an object or an environment to collect information about an object or an environment associated with the object, or process the information to semantic information to be shared and provided to a user or the object, and may recognize and determine a surrounding circumstance independently and without a command from an external source, thereby providing an intended application service.

Abstract: A reception station and a method for operating the reception station that may receive data using a multicast address from a transmission station are provided. The reception station may include an interface to receive a data packet including a multicast address from a transmission station, and a processor to distinguish a group address and a service address from the multicast address, and to maintain a reception of the data packet when a group address and a service address that are respectively identical to the distinguished group address and the distinguished service address are found from a database.

Abstract: Provided is an apparatus and method for managing a power equipment in an advanced metering infrastructure (AMI) network included in a smart grid network. According to an aspect of the present invention, an apparatus and method for managing a power equipment in an AMI network may provide a load control environment enabling a power equipment to declare an opt-out when another power equipment declares an opt-out by providing a list of power equipments included in a load control group in response to a power equipment declaring an opt-out of the load control group so as to process an opt-out of a power equipment selected from the list.

Abstract: Provided are an apparatus and method for asset tracking based on a ubiquitous sensor network (USN) using a motion sensing. The apparatus may include: a motion sensing manager to receive motion sensing information from a sensor; a filtering processor to filter the motion sensing information based on a filtering parameter and to determine whether a motion occurs based on the filtered motion sensing information; and a location information update (LU) manager to perform LU depending on whether the motion occurs.

Abstract: Disclosed herein are an apparatus and method for detecting the survival status of a living thing. The apparatus for detecting the survival status of a living thing includes a tilt sensor, a determination unit, and a communication unit. The tilt sensor is attached to a target living thing, and detects minute vibrations generated by the motion of the target living thing. The determination unit determines the survival status of the target living thing for a preset update period based on the minute vibrations. The communication unit sends an update packet including determination results of the determination unit to an outside.

Abstract: A ZigBee gateway includes: an IP network communication unit supporting communications with an IP network; a ZigBee network communication unit supporting communications with a ZigBee network; and a message processing unit generating a forwarding entry containing a service request ID and a transaction sequence ID corresponding to a service request message, when the service request message is received from the IP network, and performing a forwarding operation between the service request message and a response message transmitted from the ZigBee network in response to the service request message, by referring to the forwarding entry.

Abstract: Provided is a power control device and a control method thereof for reducing power consumption. A standby power control devices includes a plurality of electronic devices each of which is operated in a standby mode and a normal mode, and a central control unit configured to monitor load power consumed by one of the electronic devices, and perform a control operation for electrically connecting or isolating the one of the electronic devices to or from a power line by referring to a result of the monitoring and each profile information of the electronic devices, wherein the central control unit controls the one of the electronic devices to be isolated or keep a connection from or to the power line when the load power consumed by the one of the electronic devices is kept as the standby mode over a reference time.

Abstract: Provided are an energy-efficient communication method in a group information-based sensor network and a sensor network system using the method. A group exchanges group information and data with another group in order to provide an application service through inter-group cooperation in a sensor network. In this process, a target group is discovered, a communication path is established, and inter-group communication cycle information for energy-efficient communication is transmitted. On the basis of the group information and the communication cycle information, it is possible to minimize the network resource consumption and provide an energy-efficient inter-group communication method.

Abstract: Disclosed are an apparatus and a method for smart energy management by controlling power consumption. Power consumption information is collected from one or more electrical device groups with a smart meter and electrical devices connected through gateways. When the method estimates that the power consumption will be larger than a threshold value, a control command is outputted to a load controller connected through the gateway and power consumption of electrical devices that belong to the electrical device using group is remotely controlled. According to an embodiment of the present invention, an energy company that produces and supplies energy can supply energy depending on a consumer's demand by using current facilities because the present invention can collect remotely energy consumption, analyze energy consumption patterns, and control automatically the energy consumption of electrical devices installed in a customer's area.

Abstract: Provided are an AMI gateway apparatus and method for processing large AMI data and an application profile. The AMI gateway apparatus and method are associated with collecting meter data of smart meters measuring the amount of electricity or the like and transmitting the meter data to an AMI server. Disclosed is a method of reducing an ID type and a method of minimizing meter data to reduce the transmission rate of large AMI data including an ID value and meter data. A method of setting a gateway ID value according to locations and zones is also provided. Those three methods achieve the efficient transmission of large AMI data to an AMI server and is applicable to various gateway apparatuses processing various application profiles such as an HA profile controlling and sensing home appliances, an SE profile providing an AMI service, a TA profile providing mobile services or the like.

Abstract: A wakeup-on-demand apparatus includes: a wakeup radio receiver (WRR) receiving a first radio signal to detect an address; and a main radio transceiver (MRT) responding to the first radio signal, transmitting and receiving a second radio signal for data communication, when the detected address coincides with a preset address.

Abstract: A low-power method for media access control on a semi-linear sensor network with multiple sensor nodes, includes: sensing a channel after waking up from a sleep mode by an arbitrary transmission sensor node that has obtained data; and generating a long preamble including a number of element preambles and sending to a destination sensor node after said channel sensing. This method further includes: sending said data to said destination sensor node after completion of transmission of said long preamble; and identifying duty cycle information of said destination sensor node after completion of transmission of said data and adjusting the number of said element preambles according to said duty cycle information.

Abstract: Provided is a programming method of network nodes in sensor network. The programming method receives a code to be programmed in the network nodes. The programming method determines the kind of the received code. The programming method selects a programming scheme according to the determined kind of the code. The programming method programs the received code in the network nodes based on the selected programming scheme.

Abstract: A sensor actuator node includes a sensor unit for generating sensing information on circumstantial changes; a communications unit; a countermeasure information generation unit for generating countermeasure information to the circumstantial changes; and a drive unit for driving one or more actuators. When the sensor actuator node acts as a host node, the sensing information becomes main sensing information, the countermeasure information generation unit generates the countermeasure information based on the main sensing information and selectively transmits the countermeasure information to the adjacent sensor actuator nodes via the communications unit, and the drive unit drives the actuator based on the countermeasure information. When the sensor actuator node acts as a non-host node, the sensing information becomes auxiliary sensing information, and the drive unit drives the actuator based on the countermeasure information selectively transmitted thereto by the host node.