Electronics and Telecommunications Research Institute

Gwang Ja Jin

Seung Yong Lee

Hyung Joo Kim

Jin Kyu Choi

Dae Seung Yoo

Cheol Sig Pyo

Jong-Suk Chae

Wan Gyun Choi

Jong-Hyun Park

Byung Tae Jang

Chang Sub Shin

Bong Soo Kim

Yoonmee Doh

Kyong Ha Lee

Inhak Joo

Dong Sun Lim

Jeong-Ho Park

So Young Hwang

Kyong Hee Lee

A multi-hop relay maritime communication apparatus installed in a ship is disclosed. The maritime communication apparatus includes a first access module configured to comprise a plurality of directional antennas integrally formed; a second access module configured to comprise an omni-directional antenna; and a bridge configured to be connected to the first access module and the second access module via an Ethernet interface.

Multi-hop relay maritime communication apparatus

The present invention relates to an apparatus and method of performing wireless communication using multiple directional antennas. The transportation means according to the present invention includes at least two communication devices, wherein one of the at least two communication devices, communication device A, includes a directional antenna group, and the other communication device, communication device B, includes a directional antenna group, and wherein the communication device A performs directional antenna selection control of the directional antenna groupincluded in the communication device A depending on whether the communication device B is connected with a network. According to the present invention, one of the communication devices gains access to a satellite station, a base station, or other ships, at least one antenna of another communication device may be used to relay wireless communication and may play a role as a base station or an AP.

Method and apparatus of wireless communication by using multiple directional antennas

A time synchronization method in a wireless sensor network, a low power routing method using a reservation scheme, and an apparatus for performing the method are provided. The time synchronization method in the wireless sensor network may include: receiving a first synchronization request command packet from a parent node that manages time synchronization for a predetermined synchronization region; receiving, from the parent node, a second synchronization request command packet that has a transmission timestamp value of the first synchronization request command packet; and performing time synchronization for a child node based on a reception time of the first synchronization request command packet, a reception time of the second synchronization request command packet, and the transmission timestamp value of the first synchronization request command packet.

Time synchronization and routing method in wireless sensor network, and apparatus for enabling the method

A vessel block arranging device extracts image information on a vessel block loaded on a transporter, and determines whether to arrange the vessel block in an area in which the vessel block will be arranged by using location information of the arranged vessel block in the area and extracted image information, thereby reducing errors caused by determining the vessel block arrangement.

Device and method for arranging block of vessel

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Daejeon, South Korea

Gwang Ja Jin