Electronics and Telecommunications Research Institute

Sun-Ja Kim

Do-Hyung Kim

Jong-Hyun Park

Heung-Nam Kim

Chae-Kyu Kim

Jin-Suk Ma

Ik-Soon Kim

Jae-Pyeong Kim

Woo-Sik Kim

Disclosed herein is an apparatus and method for calculating a TCP checksum. An apparatus for calculating a TCP checksum includes a data division unit for dividing content to be transmitted into two or more primary data fragments by a unit of a preset byte. A first checksum calculation unit calculates first checksums for the primary data fragments, respectively. A second checksum calculation unit calculates a second checksum for secondary data to be inserted into a data area of the TCP segment using the first checksums. Accordingly, in TCP-based networks, a checksum calculation procedure is improved upon transmitting static content, so that a static content transfer rate occupying most of TCP-based network traffic can be improved.

Apparatus and method for calculating transmission control protocol checksum

A contents conversion communication terminal, a contents conversion supporting server system, and a contents conversion supporting method are provided. In a protocol structure of the communication terminal, a distribution file system layer supports a server system and at least one other communication terminal connected through a network to share a data file therebetween, an adaptation layer performs a contents conversion to use a data file in the communication terminal, the adaptation layer being placed on the distribution file system layer, and a virtual file system layer receives a system call message and transmits the system call message to the adaptation layer, the virtual file system layer being placed on the adaptation layer.

Contents conversion communication terminal, server system, and method

A multiple mode terminal according to an exemplary embodiment of the present invention includes a mode controller, an application service unit, a common link module, and a plurality of device drivers. The mode controller uses network state monitoring information and controls the handoff between a plurality of networks. The application service unit includes protocols providing appropriate data communication services for the plurality of networks, and a plurality of programs designed to perform data communication services. The common link module performs the handoff between the heterogeneous networks by a handoff request of the mode controller, updates a transmission path of the data packet according to the performed handoff, and supports a data communication service of the application service unit. The plurality of device drivers control the terminal to function for the data service in the plurality of networks.

Multiple mode terminal supporting handoff between heterogeneous networks and handoff method thereof

The present invention provides a secondary power supply for the telematics terminal. A secondary power supply for a telematics terminal including. a power control unit for controlling a power supply based on a power control signal of the telematics terminal and/or a start-up key signal; a telematics control unit which is operated by power supplied from a secondary power supply unit under the control of the power control unit and controls each of components inside the telematics terminal; the secondary power supply unit for supplying the power to the telematics control unit; and a rectifying unit for rectifying power from a main power supply unit one more time and protecting the components from a reverse voltage by opening the connection of the main power supply unit and the secondary power supply unit when a voltage level of the secondary power supply unit is higher than that of the main power supply unit.

Growing community of inventors

Daejeon, South Korea

Sun-Ja Kim