Other

Seoul National University

Sungkyunkwan University

Korea Basic Science Institute

Dong Kwan Kim

Yong Hwan Lee

Jin Seok Han

Jae Seok Bang

Gi-Ra Yi

Gaehang Lee

Jae-Do Nam

Jung Hoon Nam

You-Jin Lee

Provided is a network self-healing method in which, when a link between a parent device and a child device breaks down in a wireless communication network of a cluster-tree structure in which a main communication device (referred to an access point (AP)) manages network operation, routers that are devices capable of having their child devices, and end devices that are devices incapable of having their child devices are associated with each other in a parent-child device relationship, the link is restored. When a router becomes an orphan device, the router makes network re-association in a cluster unit while maintaining synchronized operation with its child devices, and thus time, energy and signaling burden for network self-healing is largely reduced.

Method for network self-healing in cluster-tree structured wireless communication networks

Provided is a manufacturing method of uniformly spherical gold nanoparticles using a synthesis method for controlling a size and a shape by repeating an etching and growing.

Manufacturing method of spherical gold (Au) nanoparticles and spherical gold (Au) nanoparticle manufactured by using the same

The present invention provides a thermoplastic lignin polycondensate. The thermoplastic lignin polycondensate produces no fumes and odor even at a normal melt processing temperature. The melt viscosity of the thermoplastic lignin polycondensate can be measured even when heated to 200&#xb0; C. or more. The thermoplastic lignin polycondensate can be prepared by selectively activating the hydroxyl reactive groups of lignin to suppress the crosslinking reaction of the hydroxyl reactive groups, which allows a linear or grafted linear growth of the lignin polycondensate.

Thermoplastic lignin condensation polymer, and preparation method therefor

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Seoul, South Korea

Dong Kwan Kim