Abstract: The present invention relates to a method for embedding a watermark into a black and white or color digital image [D(x)]. Basically the inventive method comprises the steps of transforming the digital image using a wavelet transform [WC(y)], transforming a watermark using discrete cosine transform (DCT), integrating the wavelet-transformed digital image with the DCT-transformed watermark [DW(x)+WC(y)] to insert the watermark into the image, and generating the watermarked image using inverse wavelet transform [D(x)?]. For color images, RGB mode is converted into YIQ mode using a conversion matrix and the wavelet transform is applied to the Y-, I-, Q-values. This inventive digital watermarking of a color image is found to be highly robust against lossy compression and other image processing operations, compared to conventionally known methods which are known to be unsuitable for watermarking color images.

Abstract: Disclosed is a method for transmitting and receiving data according to a channel state in a wireless communication system, the method includes measuring a characteristic of transmission channels used for data transmission and transmitting channel state information of the measured channel characteristic; and selecting sub-channels for data transmission according to the channel state information, and transmitting data through the selected sub-channels.

Abstract: A constellation mapping apparatus, which can reduce the storage capacity of a memory to one fourth by only storing constellation points in one quadrant of each constellation map rather than storing all the constellation points in each of the constellation maps, is provided. The constellation mapping apparatus includes a memory, an address generation block, a complementation logic block, and a scaling block. In the memory, constellation values in one of four quadrants of each constellation. The address generation block receives constellation point data, bits-per-symbol information, and valid symbol information indicating whether or not the bits-per-symbol information is valid, and generates address information of the memory where the constellation values corresponding to the constellation point data are stored and quadrant information indicating a quadrant where the constellation point data are placed.

Abstract: A modular-type home gateway system that includes a HomePNA controller connectable to an existing home telephone line, for providing a home network interface; an ADSL controller connected to a prior outdoor telephone line for providing an access network interface; and a system controller for controlling the HomePNA controller and the ADSL controller, the HomePNA controller and the ADSL controller formed as a modular type that are detachably connected to the system controller through a predetermined interface, and that provides a bridge function between a home network and an access network. The modular-type home gateway system provides a plurality of informational terminals connected to the home network with various data sharing functions (e.g., Internet service sharing function, a peripheral device sharing function, file/and application program sharing function, and an entertainment service sharing function like a network game) for not only narrow-band service data but also wide-band service data.

Abstract: A constellation mapping apparatus, which can reduce the storage capacity of a memory to one fourth by only storing constellation points in one quadrant of each constellation map rather than storing all the constellation points in each of the constellation maps, is provided. The constellation mapping apparatus includes a memory, an address generation block, a complementation logic block, and a scaling block. In the memory, constellation values in one of four quadrants of each constellation. The address generation block receives constellation point data, bits-per-symbol information, and valid symbol information indicating whether or not the bits-per-symbol information is valid, and generates address information of the memory where the constellation values corresponding to the constellation point data are stored and quadrant information indicating a quadrant where the constellation point data are placed.

Abstract: Provided is an ultra wide band (UWB)-based wireless bridge that converts wired serial data into a UWB signal with a quality of service, transmits it wirelessly, inverts the UWB signal into wired serial data. The UWB-based wireless bridge includes: a physical layer processing means; the protocol converting means; the UWB signal transceiving means; and a controlling means.

Abstract: A system and method for advantageously forming an alignment film are provided. An anilox roll is operably engaged with a printing roll to print an alignment film onto a substrate, in one example including a liquid crystal display panel. Multiple rotations of the printing roll are used to provide efficiency and flexibility in printing a variety of alignment film patterns onto a variety of substrates.

Abstract: The invention is related to methods and apparatus that recover usable video data from partially corrupted data. Embodiments inspect corrupted data packets and identify the location or locations of an error, whether the corrupted data packet contains data expected to be error-free, and whether the error-free data should be used. Decoding of a packet in both the forward direction and the backward direction can be used to locate a position of an error. Intra-coded macroblocks can also be recovered. A decoder can elect to use or to drop an intra-coded macroblock recovered from a corrupted data packet according to further criteria that is applied to the recovered intra-coded macroblock. One embodiment inspects video bitstream data that has been encoded with an optional data partitioning feature enabled, and retrieves specified data in areas of a corrupted packet that are expected to be free from error.

Abstract: Disclosed herein is a mechanical sealing device for preventing fluid leakage. The sealing device has a sealing chamber formed by a flange, a seal casing and a seal cover at a position outside a gland ring. This gland ring is used for holding the gland packings installed in a stuffing box of each of rotary and stationary sealing rings. The rotary and stationary sealing rings are provided in the sealing chamber. In this case, the rotary sealing ring is fixed to a sleeve. The stationary sealing ring comes into contact with both the sleeve and the rotary sealing ring, and is held by a slip ring biased by a spring. The spring is provided between the stationary sealing ring and the flange. Further, the sealing device has an additional sealing ring, which is provided on the inner surface of each of the gland ring and the seal cover, and comes into contact with the sleeve.

Abstract: The present invention relates to a micro-compressor equipped with plurality of compression means comprising a vibrating plate forming the outer wall of the pressure chamber, inlet valve and outlet valve attached to the vibrating plate. The compression means are operated by a certain number of piezo-actuators that are attached to the vibrating plate, inlet valve and outlet valve and perform the function of indraft, compression and exhaustion of working fluid. The piezo-actuators enable the swift operation and precise control in the micro-refrigerator with the size of semiconductor chip. The compression means do not alter the flowing direction of working fluid and the openings for the indraft and exhaustion of working fluid can be aligned in a straight line. As a result, plurality of compression means can be arranged in parallel to maximize the compression capacity.

Abstract: Provided is a radio frequency transceiver. The radio frequency transceiver includes: a receiving unit for converting a radio frequency signal received by an antenna into an intermediate signal based on an intermediate local signal; a transmitting unit for converting an intermediate signal into a radio frequency signal based on a radio frequency local signal; and a local signal generating unit for generating the intermediate local signal and the radio frequency local signal.

Abstract: The present invention relates to an active micro cooler comprising: an evaporator which, directly attached to a heat source, vaporizes refrigerant; a compressor which inhales and compresses vaporized refrigerant gas; a condenser which condenses compressed refrigerant gas for condensed refrigerant to release heat; a conduit which directs condensed refrigerant to the evaporator; and a expansion valve which, mounted on the conduit, expands condensed refrigerant. The evaporator and the condenser each comprises a heat transfer enhancement device which is mounted on a plate element having walls on the circumference of the element and several channel connectors for transmitting refrigerant.

Abstract: The present invention relates to method of authenticating copyrighted works of PDA using a unique ID based on a personal computer for preventing illegal copy and transformation in order to protect copyright of the application performed in PDA and system using thereof.

Abstract: A constellation mapping apparatus, which can reduce the storage capacity of a memory to one fourth by only storing constellation points in one quadrant of each constellation map rather than storing all the constellation points in each of the constellation maps, is provided. The constellation mapping apparatus includes a memory, an address generation block, a complementation logic block, and a scaling block. In the memory, constellation values in one of four quadrants of each constellation. The address generation block receives constellation point data, bits-per-symbol information, and valid symbol information indicating whether or not the bits-per-symbol information is valid, and generates address information of the memory where the constellation values corresponding to the constellation point data are stored and quadrant information indicating a quadrant where the constellation point data are placed.

Abstract: An apparatus for collision resolution among home networking stations using carrier sense. More specifically, an apparatus for collision resolution among home networking stations using Media Access Control (MAC) in the HomePNA 2.0 specification for constructing home networks is provided. The apparatus provides collision resolution to a larger number of stations than the number of stations protected by the HomePNA specification. In addition, the apparatus prevents the generation of errors caused by incorrect calculation of the number of back-off signals in the case of a carrier sense signal.

Abstract: The present invention is related to micro-motion machine and micro-element fabricating machine using a 3-degree-of-freedom parallel mechanism. A micro-motion machine achieves a 3-degree-of-freedom micro movement by connecting two arms connected to prismatic flexible joints respectively, adapted to conduct vertical movements, by revolute flexible joints, and one arm connected to another prismatic flexible joint, adapted to conduct vertical movements by universal joint, to a platform by universal joint. This micro-motion machine has a relatively simple and inexpensive construction, high stiffness, and high accuracy, while exhibiting reduced inertia.

Abstract: A method and apparatus for compensating for phase errors of a digital signal are provided. An equalizer compensates for an amplitude distortion of a received signal caused by a channel and outputs an equalized signal after a first predetermined delay time elapses. A first multiplying means complex multiplies the equalized signal by a phase corrected signal and outputs a first multiplied value. A first multiplexing means selectively outputs either the received signal or the first multiplied value based upon whether the first predetermined time has elapsed. A phase compensating means sets an initial value of a local oscillator based upon an average value of phase errors of the received signal before the first predetermined time elapses, and removes phase errors existing in the first multiplied value after the first predetermined time elapses.

Abstract: A method for performing a conference call between an Internet call and a telephone network call in a webphone system includes receiving a conference call key input in a point-to-point call state; checking whether there exists a held call in response to the conference call key input; adding a speech channel and forming a forming a speech path between subscribers, when there exists a held call; and performing a conference call when the speech path is formed.

Abstract: An apparatus for generating a time slot in a home network system using home PNA 2.0 protocol and a method thereof are provided.

Abstract: A module IC handler used for testing module Ics is disclosed in which the handler enables loading and unloading operations for module ICs, without further elevating pallet over an installation plate, and provides sequential transferring operations for the pallet on which test or customer tray is placed. To this end, after all module Ics 1 are loaded from the test tray 6 exposed to the loading or unloading position 19 or 26 by the loading and unloading elevator units 18a, 18b, or the test-finished module Ics are filled in the customer tray 17, the pallet 5 is moved to a rotation position 30 by a transfer 31, and then can be circulated to an upper side of the loading or unloading elevation plate 36 by the downer 32.