Electronics and Telecommunications Research Institute

Sun Hwa Lim

Young Il Kim

Geon Min Yeo

Dae Geun Park

Byeong Cheol Choi

Soon Yong Song

Hyo Chan Bang

Jae Ho Kim

Sang Ho Lee

Yong Tae Lee

Mi Young Yun

Yeong Jin Kim

Jee Hyeon Na

Jung Mo Moon

Chul Min Park

Dae Ik Kim

Eun Hee Hyun

Jai Hyung Cho

Hyun Suk Roh

Hyun Woo Lee

Won Geun Ryu

Byung Jang Jeong

Hoi Yoon Jung

Doug Young Suh

Sang Won Kim

Dae Sik Kim

Ho Choong Cho

Chul Keun Kim

Eun Ju Park

A method of transmitting control information by an end node in a wireless communication system supporting multi-channel transmission includes: transmitting control information to a center node on a first channel among multiple channels within a control period of a wireless frame when the first channel is in an idle state; transmitting the control information to the center node on a second channel when the first channel is not in the idle state and the second channel is in the idle state, the second channel being selected from channels other than the first channel among the multiple channels; and transmitting the control information to the center node in a subsequent wireless frame when the second channel is not in the idle state.

Method and device for operation based on multiple channels in sensor network

A logistics information processing server includes a data processor configured to receive environment sensing data collected from at least one environmental sensor disposed in a cargo storage device in which at least one cargo is stored and cargo related information collected from a cargo tag attached to the at least one cargo, and to perform processing by classifying the environment sensing data and the cargo related data into cargo storage environment data, cargo information, and transportation environment information according to data attributes; and a logistics trust index generator configured to generate a logistics trust index indicating a degree of influence exerted on the quality of the cargo from the cargo storage environment data, cargo information, and transportation environment information output by the data processor.

Method of processing logistics information, logistics information processing server using the same, and logistics managing apparatus using the same

A method for providing a traffic safety service of a traffic safety service server communicating with a client terminal includes: receiving sensor data of each sensor from the client terminal; classifying the sensor data into data according to at least one specific time slot for each sensor and calculating a safety score of each of the at least time slot; calculating an average of the safety scores of the at least time slot and calculating a safety score for each sensor, and calculating a safety index on the basis of the safety score for each sensor and a weight assigned to each sensor.

Method and apparatus for providing traffic safety service based on decision layer model

A dynamic packet relay method of a personal area network (PAN) coordinator in a sensor network includes receiving a Child_Register message that includes information about a device associated with a coordinator and building or updating a network hierarchical structure; monitoring reception of a packet or a beacon from the coordinator and determining whether the coordinator is defective or not; and in response to a determination that the coordinator is defective, changing the current coordinator to one of devices belonging to a PAN as a new coordinator.

Dynamic packet relay apparatus and method for sensor network

An apparatus for dynamically configuring a wireless sensor relay network for monitoring train activity according to the present invention includes a plurality of wireless sensors that wirelessly transmit sensor data obtained by measuring heat and vibration of a train running unit, a plurality of coordinator units that are located in train cars, and receive the sensor data from one or more wireless sensors located within the same train car, a plurality of wireless relay units that are located in the train cars, form a wireless sensor relay network with the wireless relay unit located in a neighboring train car, and transmit the sensor data received from the coordinator units, and a gateway unit that receives the sensor data from the plurality of wireless relay units through the wireless sensor relay network, and transmits the received sensor data to a control center.

Apparatus and method for dynamically configuring wireless sensor relay network for monitoring train activity

A hybrid self-generation apparatus includes a vibration source based generation part installed in a mechanical apparatus and converting vibration energy generated during operation or movement of the mechanical apparatus into first electric energy; a wind power source based generation part installed in the mechanical apparatus and converting kinetic energy of air generated in periphery of the mechanical apparatus during operation or movement of the mechanical apparatus into second electric energy; and a power storage part storing the first electric energy and the second electric energy. Also, the wind power source based generation part includes at least one air controller, and the wind power source based generation part automatically operates or stops power generation according to a movement speed of the mechanical apparatus in accordance with operation of the at least one air controller.

Hybrid self-generation apparatus using vibration source and wind power source, and wireless sensor using the same

The present invention relates to a wireless communication system and, more particularly, to a spectrum sensing method in cognitive radio communication. According to an aspect of the present invention, a method of canceling an introduced transmission signal includes generating a first signal, having an inverse phase, using a data transmission signal transmitted by a data transmission unit, adjusting a path and/or an amplitude of the first signal, and generating a first signal, having an inverse phase, using a data transmission signal transmitted by a data transmission unit, adjusting a path and/or an amplitude of the first signal, and canceling a second signal, introduced through a data receiving unit, and the first signal by the data transmission signal.

Method and apparatus for canceling introduced signal and cognitive radio communication apparatus using the same

Disclosed are a system and a method for receiving an MBMS broadcasting service. In the present invention, in a mobile communication/wireless communication system, an MBMS service is provided by synchronizing a unicast bearer with a multicast bearer through scheduling information mapping at the time of transmitting a broadcast/multicast service through a unicast. Further, the present invention presents even a method for improving quality of experience (QoE) of the service by providing the MBMS service through the multicast bearer and the unicast bearer simultaneously. According to the present invention, MBMS services of various service qualities can be provided depending on wireless quality of a terminal or the capability of the terminal at the time of providing the MBMS service.

System and method for receiving MBMS broadcasting service

Provided is a method and apparatus for reducing zapping delay, which may transmit base layer data for each burst in a time-slicing scheme, and output the base layer data of a channel to be changed at the time of changing the channel, thereby reducing the zapping delay.

Streaming server and mobile terminal for reducing channel-changing delay, and a method therefor

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Daejeon, South Korea

Sun Hwa Lim