Abstract:
An apparatus, method and system are provided for routing a broadcast data frame in a mesh network with multiple mesh portals. In the mesh network, every mesh point selects and registers its default mesh portal. A mesh portal enters its address in a destination address field of a broadcast data frame received from outside of the mesh network and broadcasts the data frame to inside of the mesh network. The mesh point processes a received broadcast data frame relating to its registered mesh portal, thereby preventing the broadcast data frame from being redundantly transmitted in the mesh network.
Abstract:
A multifunctional die attachment film used in a semiconductor packaging process includes a first die attachment film attached to a surface of a wafer having fine circuit patterns and solder bump patterns and having a first adhesive strength; and a second die attachment film attached on the first die attachment film and having a second adhesive strength with a wafer, a die chip, PCB and a flexible board, and the multifunctional die attachment film serves as a backgrinding tape in a backgrinding process, and after the backgrinding process is completed, the multifunctional die attachment film is not removed, but is used to attach a die chip to a connection member. And, the present invention utilizes the die attachment film as a backgrinding tape in the backgrinding process and concurrently a wafer protection means in a wafer dicing process, thereby preventing sawing burr, scratches or cracks.
Abstract:
A method of performing a handover from a Wideband Code Division Multiple Access (WCDMA) system to a Code Division Multiple Access (CDMA) system in a multi-mode terminal having a WCDMA module and a CDMA module includes determining whether a handover to the CDMA system is necessary during a call through a WCDMA system; acquiring a pilot signal from the CDMA system by activating the CDMA module if it is determined that the handover to the CDMA system is necessary; receiving a sync signal if the pilot signal from the CDMA system is acquired; transmitting information for handover to the WCDMA system through the WCDMA module; allowing the CDMA module to enter a CDMA traffic state using handover information if the handover information is received from the WCDMA system through WCDMA module; and releasing a traffic state of the WCDMA module.
Abstract:
Provided is a satellite ground control system and method based on a communication satellite. The system includes: a communication satellite link means for monitoring and controlling a system device and transmitting remote measurement data and a process result to the central control station; an interface for analyzing the command, transmitting the command to a processing means and transmitting remote measurement data and a process result to the communication satellite link means; a satellite operating means for receiving a command from the interface, transforming the command into a remote command and transmitting remote measurement data to the interface; and a control satellite link means for transmitting the received remote command, receiving the remote measurement data, transmitting the remote measurement data to the satellite operating means, and transmitting a process result of monitor and control of a corresponding system device to the interface.
Abstract:
Provided is a Global Positioning System (GPS) signal repeater and a GPS receiver of a stationary orbit satellite, and a method for positioning a stationary orbit satellite using the same. The GPS signal repeater includes: a GPS receiver for receiving an L-band GPS signal transmitted from a GPS satellite; a low-noise amplifier for removing noise of the received L-band GPS signal and maximally amplifying a desired signal; a frequency transformer for transforming the amplified L-band GPS signal into an up-link frequency band; a high power amplifier for amplifying the transformed up-link frequency band GPS signal; and a transmitter for transmitting the amplified signal to a stationary orbit satellite.
Abstract:
The present invention provides a duplex system for setting a route of telecommand and a method thereof. A duplex system for setting a route of telecommand, including: a first telecommand processing unit and a second telecommand processing unit for changing a format of a telecommand into a predetermined format; an up/down converting unit for up-converting the telecommand and for down-converting a telemetry; a first modem for modulating the telecommand; a second modem for modulating the telecommand; a control unit for setting the first modem as the route of telecommand, observing the first modem and the second modem and changing the second modem as the route of telecommand when an error occurs in the first modem; and a switching unit for setting the route of telecommand as one of the first modem and the second modem and transmitting the telecommand into the up/down converting unit.
Abstract:
A method and apparatus for controlling power of a transmitter in a mesh network. A controller, if it sets a reference power to one of a first measured transmission power and a maximum power, compares the reference power with a first power in level, and compares the first power with a second power in level. A cumulation factor calculator calculates a cumulation factor by comparing the first power with the second power. A reference power setter sets the reference power according to a scope to which a value obtained by adding a reference power to a sum of the calculated cumulation factors belongs. A power controller controls transmission power according to the set reference power.
Abstract:
Provided is a satellite simulation system based on component-based satellite modeling. The system includes: a user interface unit for receiving simulation control commands and data and parameter required for simulation from a user; a satellite model unit for individually storing information dependant on the satellite, characteristics of the simulation object model and parameter information based on the characteristics, and performing simulation upon receipt of simulation control commands; and a simulation kernel unit for creating a schedule control command for simulation control of the satellite model unit, the onboard simulation unit and the external interface unit by the control command receiving/transmitting from/to the control command/telemetry to satellite control system, performing control and collecting and managing simulation results.