Electronics and Telecommunications Research Institute

Samsung Fine Chemicals Co., Ltd.

Kyung-Il Kim

Kyeong-Tae Kim

Soo-Hyung Lee

Won-Tae Kim

Hyung-Kook Jun

Yong-Yeon Kim

Seung-Min Park

Joo Chan Sohn

Hyun Kyu Cho

Dae Il Hwang

Young-Jo Cho

Kyoung Rok Roh

Young Cheol Go

Jae-Hyuk Kim

Won Jang Lee

Je-Man Park

Young-Guk Ha

Hyeonsung Cho

Jung Hwan Lee

In-Whee Joe

Woo-Yeob Lee

Sung-Moon Chung

Disclosed herein are a multicast apparatus and method. In the multicast method, a multicast apparatus searches one or more communication objects in a distributed network environment. Multicast data is received from a sender-side communication object among the one or more communication objects. A polling message is received from the communication object that transmitted the multicast data. A response message corresponding to the polling message is sent. It is determined whether a transmission error has occurred between communication objects based on results of sending of the response message, and multicasting is performed based on results of determination.

Multicast apparatus and method

Provided are a network node and a method of performing discovery, which may stably perform discovery without delay or crash of a network at the time of initial discovery in a large-scale network. The network node operated in a distributed network includes a discovery performing unit that determines a discovery back-off time that is a transmission wait time of a discovery message based on levels of priority of the network node, and a communication unit that transmits the discovery message using the discovery back-off time.

Apparatus and method of performing discovery based on priority level in distributed network, and method of determining discovery back-off time

A biological signal sensor apparatus worn on a user's body includes: a sensor unit for sensing physical states or movements of a user to generate biological signal data; a wireless communications unit for performing wireless data communications with a wireless sensor network to transmit the biological signal data; a sensor network protocol processing unit for processing protocols for end-to-end communications between the wireless communications unit and the wireless sensor network and for performing a mobility support procedure for the biological signal sensor apparatus; a processor for controlling the wireless data communications, the end-to-end communications, and the mobility support procedure to allow the biological signal sensor apparatus to serve as a mobile wireless sensor node; and a connection unit for connecting the sensor unit and the processor. The biological signal sensor apparatus serves as a mobile wireless sensor node in the wireless sensor network.

Biological signal sensor apparatus, wireless sensor network, and user interface system using biological signal sensor apparatus

A process for the preparation of chiral (S)-2,3-disubstituted-1-propylamine derivatives, in which a carbonyl group of (S) 3,4-disubstituted-1-butanecarbonyl derivatives is converted to an amine group, and the conversion reaction is performed through Curtius rearrangement or Hoffman rearrangement.

Process for preparing chiral (s)-2,3-disubstituted-1-propylamine derivatives

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Daejeon, South Korea

Kyung-Il Kim