Electronics and Telecommunications Research Institute

Other

Dong Hyun Ahn

Choongil Yeh

Dong Seung Kwon

Keun Young Kim

Wooram Shin

Jihyung Kim

Jae Young Ahn

Tae Gyun Noh

Choong Il Yeh

In Hwan Lee

Hyung Seok Chung

A synchronization method performed by a first communication node may include: receiving, from a second communication node of the communication system, a first synchronization information signal including information on a first synchronization reference time and information on a first offset; identifying information on a first time at which the first synchronization information signal is transmitted and information on a target synchronization time configured by the second communication node, based on the information included in the first synchronization information signal; setting a synchronization timer based on the information on the first offset; and when the synchronization timer expires, determining that time synchronization with the second communication node is acquired.

Method and apparatus for synchronization in wireless communication system

Provided is a hair growth-promoting composition comprising: 100 parts by weight of a stem cell culture solution obtained from a culture medium of mesenchymal stem cells which have been subcultured two or more times; 0.001 to 0.1 parts by weight of zinc; 5 to 50 parts by weight of a panthenol based compound; and 0.0001 to 0.1 parts by weight of a water-soluble vitamin, wherein it is sprayed or applied on the scalp to promote hair growth. Said hair growth-promoting composition may have an excellent effect and improve economical efficiency in treating alopecia due to a simple delivery method of the composition.

Hair growth-promoting composition

Disclosed are methods and apparatuses for public safety communication. A method comprises transmitting a groupcast setup request message to a base station; receiving an uplink grant message including information on groupcast resources in response to the groupcast setup request message from the base station; and transmitting data to be transmitted to receiving terminals belonging to a group to which the transmitting terminal belongs to the base station through the groupcast resources. Therefore, public safety communication can be efficiently performed in a wireless communication system.

Method for public safety communication and apparatus for the same

Under a wireless communication environment in which nodes sharing a time reference communicate information with a frame having a predetermined structure, when a node that has failed to acquire synchronization, a protocol in which neighboring nodes relays synchronization to the synchronization acquisition failed node by using a preamble defined in the frame is provided.

Method for supporting time synchronization relaying to neighboring nodes in wireless network

In a mobile wireless network system including a plurality of nodes communicating with each other, a node attempting to transmit data finds useable resources through performing carrier sensing on packet data unit (PDU) slots and transmits data through the found resources. A node attempting to receive data finds useable resource through performing carrier sensing on acknowledge (ACK) slots and receives data through the found resources.

Method and apparatus for transmitting/receiving in mobile wireless network

In a mobile wireless network system including a plurality of nodes, available resources of a transmitting node and available resources of a receiving node are searched for. Commonly overlapped allocatable resources among available resources of a transmitting node and available resources of a receiving node are searched for, areas corresponding to the calculated allocation resource number according to an allocation condition that is set in the allocatable resource area are selected, and the areas are allocated to the transmitting node or the receiving node.

Growing community of inventors

Daejeon, South Korea

Dong Hyun Ahn