Abstract: A technology to measure the mass flux distribution of liquid spray to evaluate droplet dispersion of a spray device for liquids such as fuel, paints, or coating agents, is provided. The apparatus for measuring spray mass flux to evaluate the droplet dispersion of the spray device includes a liquid spraying part including a spray nozzle to spray liquid, a spray collecting part to collect the liquid sprayed from the liquid spraying part, a transfer tube to transfer the liquid collected in the spray collecting part, a multi-cylinder part including a plurality of cylinders to receive the liquid collected in the spray collecting part, a movable mass measurement part to measure a mass of each cylinder of the multi-cylinder part, and a mass flux calculating part to calculate a distribution graph of mass flux of the sprayed liquid.

Abstract: A bridge-based cellular Ethernet system and a handover processing method therefore are provided. In the bridge-based cellular Ethernet system, an HLR manages configuration information about network entities, and a plurality of Base Station Bridges (BSBs) are connected to a plurality of Base Stations (BSs), each BSB including a layer 2 switch, and a plurality of SCBs connected to part of the BSBs under the SCBs. Each SCB includes a layer 2 switch forming a core network, and SCB monitors the signal power of a Mobile Node (MN) within its service area, determines whether the MN is to move to another site, selects a new SCB to which the MN is to move, sends necessary path information to associated SCBs and the HLR, for setting of the path information in the associated SCBs and the HLR, and commands a handover to the MN.

Abstract: A technology to measure the mass flux distribution of liquid spray to evaluate droplet dispersion of a spray device for liquids such as fuel, paints, or coating agents, is disclosed. The apparatus for measuring spray mass flux to evaluate the droplet dispersion of the spray device includes a liquid spraying part including a spray nozzle to spray liquid, a spray collecting part to collect the liquid sprayed from the liquid spraying part, a transfer tube to transfer the liquid collected in the spray collecting part, a multi-cylinder part including a plurality of cylinders to receive the liquid collected in the spray collecting part, a movable mass measurement part to measure amass of each cylinder of the multi-cylinder part, and a mass flux calculating part to calculate a distribution graph of mass flux of the sprayed liquid.

Abstract: A bandwidth aggregation system for providing wideband communication services by aggregating multiple bandwidths and a transmission band determination method for the bandwidth aggregation system are disclosed. T bandwidth determination method includes computing weights of the multiple bandwidths based on resource allocation distributions of the individual bandwidths, and selecting one of the multiple bandwidths for establishing a connection between a base station and a mobile station based on the weights of the multiple bandwidths.

Abstract: The high throughput particle separation system includes an aqueous solution container for storing an aqueous solution containing specific particles to be separated, an electrode array, having a plurality of electrodes arranged at regular intervals or at various different intervals in series or in parallel, for deflecting specific particles simultaneously in a nonuniform electric field according to sizes and dielectric properties of the particles to separate a large quantity of the particles at high throughput, a path separation unit for establishing movement paths of the particles separated by the electrode array, and a control unit for applying the same voltage and frequency or different voltages and frequencies to the electrodes of the electrode array based on sizes and dielectric properties of specific particles to be separated.

Abstract: The high throughput particle separation system includes an aqueous solution container for storing an aqueous solution containing specific particles to be separated, an electrode array, having a plurality of electrodes arranged at regular intervals or at various different intervals in series or in parallel, for deflecting specific particles simultaneously in a nonuniform electric field according to sizes and dielectric properties of the particles to separate a large quantity of the particles at high throughput, a path separation unit for establishing movement paths of the particles separated by the electrode array, and a control unit for applying the same voltage and frequency or different voltages and frequencies to the electrodes of the electrode array based on sizes and dielectric properties of specific particles to be separated.

Abstract: Disclosed is a waveguide adapter able to generate a circularly polarized wave. The waveguide adapter to be coupled with a horn antenna realizes a polarized wave conversion function for converting a linearly polarized wave signal into a circularly polarized wave signal, or vice versa, and an adapter function for converting a waveguide signal into an external transmission line signal, resulting in a simplified configuration and small size of a communication system using a circularly polarized wave signal. The waveguide adaptor includes a probe to transmit a linearly polarized wave signal from an external transmission line to a waveguide transmission line, a polarized wave conversion line reflector located in the rear of the probe to convert a vertically polarized wave into a horizontally polarized wave, and a back-short member to forwardly transmit a rearward signal. The waveguide adapter is applicable to communication systems using circularly polarized wave signals.

Abstract: A method and apparatus for transmitting a time stamp to provide a multicast service by a base station in a communication system is provided. Upon receipt of a multicast service request from a first terminal, the base station determines whether a second terminal exists that was receiving data of the multicast service before the multicast service request is received. The base station determines whether the multicast service data is being transmitted to the second terminal in a unicast manner when the second terminal exists. The base station allocates a first multicast Connection Identifier (CID) and a first time stamp of an earliest order to the second terminal when the multicast service data is being transmitted to the second terminal in a unicast manner. After allocating the first time stamp to the second terminal, the base station allocates the first multicast CID and a second time stamp having a next earliest order to the first terminal.

Abstract: A signal transmission apparatus in a Double Orthogonal Frequency Division Multiplexing (DOFDM)/Double Orthogonal Frequency Division Multiple Access (DOFMA) communication system generates a first signal by performing row-wised Orthogonal Frequency Division Multiplexing (OFDM) on M sub-samples for each of N sub-carriers, generates a second signal by performing column-wised OFDM on the first signal generated for each of the N sub-carriers, and transmits the second signal to a signal reception apparatus. Here, N denotes a number of sub-carriers used in the DOFDM/DOFDMA communication system, and M denotes an integer greater than or equal to 1.

Abstract: A method of treating signals in a bridge-based radio access station backbone network including a plurality of base station bridges (BSBs), with each BSB having a 2-tiered switch connected with a plurality of radio access stations. A plurality of SCBs (Site Core Bridges), each of having a 2-tiered switch for constituting the core network, includes the steps of buffering by the SCB a predetermined number of previously-transmitted frames when operating as a crossover bridge, and causing the SCB to retransmit selected ones of the buffered previously-transmitted frames to a terminal in response to a handover completion signal.

Abstract: A method of treating a handover in a bridge-based radio access station backbone network including a plurality of base station bridges each including a two-tiered switch connected with a plurality of radio access stations, a plurality of SCBs (Site Core Bridges) each composed of two-tiered switch for constituting the core network, and an HLR (Home Location Register) for managing the structural information of the network constituents. The SCB stores the terminal information containing the receiving address of the initial terminal registration message and the SCB to delete the terminal information in response to a disconnection message of the terminal caused by handover, to request the SCBs in the terminal end of the old MAC-in-MAC tunnel to delete the tunnel information and the terminal information, and to inform the HLR of initiating the handover to change the registered operational state of the terminal.

Abstract: A circularly polarized antenna includes a dielectric substrate having a first via array in the form of a cylindrical cavity, a micro-strip circular patch antenna located at the center of the cylindrical cavity and formed on the dielectric substrate to radiate a signal, and a rectangular dielectrically loaded waveguide having a second via array and serving to feed the signal to the micro-strip circular patch antenna. Accordingly, the circularly polarized antenna prevents impedance mismatch between the micro-strip antenna and the dielectrically loaded waveguide and broadens an impedance bandwidth thereof.

Abstract: The high throughput particle separation system includes an aqueous solution container for storing an aqueous solution containing specific particles to be separated, an electrode array, having a plurality of electrodes arranged at regular intervals or at various different intervals in series or in parallel, for deflecting specific particles simultaneously in a nonuniform electric field according to sizes and dielectric properties of the particles to separate a large quantity of the particles at high throughput, a path separation unit for establishing movement paths of the particles separated by the electrode array, and a control unit for applying the same voltage and frequency or different voltages and frequencies to the electrodes of the electrode array based on sizes and dielectric properties of specific particles to be separated.

Abstract: A method and apparatus for transmitting a time stamp to provide a multicast service by a base station in a communication system is provided. Upon receipt of a multicast service request from a first terminal, the base station determines whether a second terminal exists that was receiving data of the multicast service before the multicast service request is received. The base station determines whether the multicast service data is being transmitted to the second terminal in a unicast manner when the second terminal exists. The base station allocates a first multicast Connection Identifier (CID) and a first time stamp of an earliest order to the second terminal when the multicast service data is being transmitted to the second terminal in a unicast manner. After allocating the first time stamp to the second terminal, the base station allocates the first multicast CID and a second time stamp having a next earliest order to the first terminal.