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| 20090140843 | METHOD FOR PROVIDING RADIO FREQUENCY IDENTIFICATION APPLICATION INTERFACE AND SYSTEM THEREOF - The present invention relates to an RFID application interface method and a system thereof. In the present invention, an RFID middleware system changes a control request input from a user or an RFID application system according to a communication protocol of an RFID device to be controlled, and sends it to the RFID device. Also, when the user or the RFID application system inputs a data process policy that is common to various RFID devices of a logical RFID device group, the RFID middleware system generates data process rules that are suitable for communication capability and data processing capability of each RFID device based on the data process policy and provides an interface that allows processing of data by a corresponding RFID device. In addition, the RFID middle system defines a procedural flow of at least one of services and at least one of tasks that constitute an RFID business process and provides an interface to support interconnection and cooperation of services that are included in the RFID business process. | 06-04-2009 |
| 20100097242 | SYSTEM AND METHOD FOR PROVIDING POLICY BASED RADIO FREQUENCY IDENTIFICATION SERVICE - Disclosed is a system and method for providing a policy based radio frequency identification service The system for providing the policy based radio frequency identification service includes a policy vocabulary managing device for generating and managing policy vocabulary based on a policy vocabulary writer's control input, a policy performing resource managing device for generating and managing resource information for performing a radio frequency identification service policy based on a resource designator's control input, a policy rule managing device for generating and managing a policy rule sentence based on a policy user's control input, and a policy rule performing device for performing a radio frequency identification service policy by using a policy rule sentence input based on a policy user's control input. | 04-22-2010 |
| 20110099271 | SYSTEM AND METHOD FOR ENFORCING RFID EVENT MANAGEMENT POLICY - Provided are a system and method for enforcing a radio frequency identification (RFID) event management policy. The system includes a policy definer for defining an RFID event management policy to be used by a client to manage an apparatus on the basis of an RFID event, a policy storage for storing the RFID event management policy, a policy determiner for selecting the RFID event management policy stored in the policy storage using a profile of the client included in an RFID event management policy request when the RFID event management policy request is received from the client, and a policy enforcer converting the selected RFID event management policy according to a standard executable by the client. | 04-28-2011 |
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| 20080199719 | Data recording medium for data storage and method of recording or erasing data using the same - Provided is a data recording medium having improved data recording/storage characteristics and with an improved structure to have a higher data storage capacity, and a method of recording and/or easing data using the same. The data recording medium may include a Cu electrode layer on a substrate, and a data recording layer formed of a compound including a metal and at least one non-metal selected from the group consisting of S, Se, and Te, on the Cu electrode layer. Data is recordable to or erasable from the data recording layer by changing the resistance of the data recording layer by diffusing Cu ions from the Cu electrode layer to the data recording layer or by erasing Cu ions from the data recording layer by diffusing Cu ions from the data recording layer back to the Cu electrode layer, according to a voltage pulse applied to the data recording layer. | 08-21-2008 |
| 20090194764 | Multi-layer storage node, resistive random access memory device including a multi-layer storage node and methods of manufacturing the same - A multi-layer storage node, resistive random access memory device and methods of manufacturing the same are provided. The resistive random access memory device includes a switching structure and a storage node connected to the switching structure. The storage node includes a lower electrode, a first layer, a second layer, and an upper electrode that may be sequentially stacked. The first layer may be formed on the lower electrode and includes at least one of oxygen (O), sulfur (S), selenium (Se), tellurium (Te) and combinations thereof. The second layer may be formed on the first layer and includes at least one of copper (Cu), silver (Ag) and combinations thereof. The second layer may be formed of a material having an oxidizing power less than that of the first layer. The upper electrode may be formed on the second layer. | 08-06-2009 |
| 20090258237 | GRADED COMPOSITION ENCAPSULATION THIN FILM COMPRISING ANCHORING LAYER AND METHOD OF FABRICATING THE SAME - Disclosed herein is a graded composition encapsulation thin film and a fabrication method thereof. The encapsulation thin film comprises a substrate, a graded composition layer and an anchoring layer interposed therebetween. The anchoring layer serves to improve the adhesion between the graded composition layer and the substrate and creates advantageous conditions for the formation of the graded composition layer. Due to the presence of the anchoring layer, the encapsulation thin film has excellent barrier properties against the permeation of moisture and oxygen and is highly resistant to diffusion of other chemical species. | 10-15-2009 |
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| 20090168908 | APPARATUS AND METHOD FOR ESTIMATING DELAY SPREAD OF MULTI-PATH FADING CHANNEL IN OFDM SYSTEM - Provided is an apparatus for estimating a delay spread of a multi-path fading channel in an Orthogonal Frequency Division Multiplexing (OFDM) system. The apparatus is applied to an OFDM receiver including a channel equalization unit compensating channel distortion by estimating channel distortion at pilot locations with respect to output signals of an FFT unit. | 07-02-2009 |
| 20090196383 | CORRELATION APPARATUS AND METHOD FOR FREQUENCY SYNCHRONIZATION IN BROADBAND WIRELESS ACCESS COMMUNICATION SYSTEM - A correlation apparatus and method for frequency synchronization are provided. A frequency synchronization method of a receiver in a broadband wireless access communication system includes acquiring a highest correlation value by conducting a differential correlation of a variable interval between a received signal and a reference signal and performing a frequency synchronization according to the highest correlation value. | 08-06-2009 |
| 20100142632 | FREQUENCY SYNCHRONIZATION APPARATUS AND METHOD IN OFDM SYSTEM - A frequency synchronization apparatus includes: a correlating unit that obtains a first correlation value by correlating a known reference guard interval of an OFDM symbol and a reference copy interval corresponding to the reference guard interval, and obtains a second correlation value by correlating the estimate guard interval and an estimate copy interval corresponding to the estimate guard interval; a determining unit that compares the first and second correlation values to determine a first case where the first correlation value is larger by a pre-set magnification than the second correlation value, a second case where the second correlation value is larger by a pre-set magnification than the first correlation value, and a third case which is not the first case nor the second case; and a frequency offset estimating unit that estimates a frequency offset by using a correlation value corresponding to any one of the first to third. | 06-10-2010 |
| 20100158094 | APPARATUS AND METHOD FOR OFDM CHANNEL EQUALIZATION - An apparatus and method for orthogonal frequency division multiplexing (OFDM) channel equalization are disclosed. The apparatus includes a compensation value setting unit setting a compensation value in the form of a diagonal matrix by use of a diagonal matrix of diagonal elements extracted from a channel matrix of an OFDM receiver, and a preset divergence suppression value, an initial estimation value calculation unit calculating an initial estimate value by use of a fast Fourier transform (FFT)-processed signal of the OFDM receiver and the compensation value, an equalization unit detecting a transmission signal to be processed by use of the compensation value, the channel matrix and the diagonal matrix, and a symbol decision unit determining a symbol for an adjacent signal of a transmission signal, which is to be processed among a plurality of signals output from the equalization unit, and providing the symbol-determined adjacent signal to the equalization unit. | 06-24-2010 |
| 20100158144 | SAMPLING FREQUENCY OFFSET ESTIMATION APPARATUS AND METHOD OF OFDM SYSTEM - A sampling frequency offset estimation apparatus of an orthogonal frequency division multiplexing (OFDM) system according to an aspect of the invention may include: a first differential operation unit performing complex conjugate multiplication of scattered pilots of complex symbols subjected to a fast Fourier transform (FFT) in an OFDM receiver; an interpolation unit repeating an operation of obtaining a median complex symbol between two consecutive symbols among complex symbols having first phase difference information from the first differential operation unit by a predetermined number; a second differential operation unit performing complex conjugate multiplication of two consecutive median complex symbols among median complex symbols from the interpolation unit; and a sampling frequency offset estimation unit estimating sampling frequency offset using complex symbols having second phase difference information from the second differential operation unit. | 06-24-2010 |
| 20110167321 | APPARATUS AND METHOD OF TRANSMITTING AND RECEIVING DATA FOR IMPROVING TRANSMISSION RATE - A data transmitter and receiver for improving a data rate, and more particularly, to an apparatus and method of transmitting and receiving an orthogonal frequency division multiplexing (OFDM) symbol in which a pilot signal is added to a data signal is provided. The apparatus includes a transmitter including: a pilot adder to add a pilot signal to a data signal; and a guard interval inserting unit to insert a guard interval to the data signal with the added pilot signal, and a receiver including: a guard interval removal unit to remove a guard interval in a received time domain signal; a fast Fourier transform (FFT) unit to transform the time domain signal in which the guard interval is removed to a frequency domain signal; a channel estimator to estimate a channel value from the time domain signal in which the guard interval is removed; an equalizer to equalize the frequency domain signal based on the estimated channel value; and a pilot signal removal unit to remove the pilot signal in the equalized frequency domain signal. | 07-07-2011 |
| 20110176583 | WIRELESS COMMUNICATION SYSTEM AND METHOD FOR PERFORMING COMMUNICATION IN THE WIRELESS COMMUNICATION SYSTEM - Provided are a wireless communication system and a method of performing communication in the same. The wireless communication system includes a terminal configured to classify all subcarriers into a first group and a second group and allocate subcarriers of the first group to first symbols and subcarriers of the second group to the first symbols again to generate and transmit a first transmission signal, a base station configured to allocate the subcarriers of the first group to second symbols and the subcarriers of the second group to third symbols to generate and transmit a second transmission signal, and a relay configured to receive the first and second transmission signals and perform maximum likelihood (ML) determination of frequency domain signals of the first and second transmission signals to estimate the first to third symbols. | 07-21-2011 |
| 20120063529 | INTER-CELL INTERFERENCE MITIGATION METHOD USING SPATIAL COVARIANCE MATRIX ESTIMATION METHOD FOR INTER-CELL INTERFERENCE MITIGATION OF MIMO ANTENNA OFDM SYSTEM - Disclosed is an inter-cell interference mitigation method using a spatial covariance matrix (SCM) estimation method in a multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) communication system for mitigating interference between asynchronous cells. The inter-cell interference mitigation method includes extracting a reference symbol (RS) of a received OFDM symbol and performing channel estimation, estimating an initial SCM using the RS signal and the channel estimation result, applying time-domain sinc type weighting to the initial SCM and applying an SCM, and demodulating a data symbol with mitigated inter-cell interference using the channel estimation result and the estimated SCM. By applying time-domain sinc type weighting to SCM estimation, it is possible to reduce an SCM estimation error occurring due to a spectral leakage induced by an abrupt change in a signal at a border point between an effective sub carrier zone and a guard band zone, and a simple design of a moving average filter form for a frequency domain signal can be made instead of frequency-time-frequency domain transformation using an inverse fast Fourier transform (IFFT) and fast Fourier transfer (FFT). | 03-15-2012 |
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| 20090286561 | SYSTEM AND METHOD FOR MULTIMEDIA SERVICE OF MOBILE COMMUNICATION NETWORK - A multimedia service providing method in a telecommunication network is disclosed. In one embodiment, the method includes (a) communicating, at a message providing server, data with first and second mobile terminals in an Internet protocol (IP) based mobile communication network, (b) receiving, at a message providing server, a short message from the first mobile terminal, wherein the short message indicates that the first mobile terminal requests a multimedia service from the second mobile terminal, and wherein the short message comprises a predetermined header field to determine whether the message requests the multimedia service and (c) transmitting the short message to the second mobile terminal, wherein the transmitted short message is configured to control the second mobile terminal to set a packet data protocol (PDP) session, for performing the multimedia service, with the first mobile terminal. | 11-19-2009 |
| 20100023625 | TERMINAL UNIT FOR HANDLING SESSION ON THE BASIS OF SESSION INITIATION PROTOCOL, METHOD OF TRANSMITTING AND RECEIVING THEREOF - According to the present invention, a service is configured by a plurality of sessions and respective session negotiation requests defined by different media formats can be performed without influencing existing connected sessions, and hence it is easy to add, delete, and change the media, the contact of session negotiation can be specified, and the response to the session negotiation request can be processed easily with the service acceptance or rejection of the contact. | 01-28-2010 |
| 20100208229 | Maskless exposure method - Disclosed is a maskless exposure method, where it is possible to perform a more precise optical alignment using a first pattern of a maskless exposure part and a second pattern of a main reference unit, and it is also possible to reduce generation of a blur in an exposed pattern. | 08-19-2010 |
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| 20110091241 | DEVELOPING APPARATUS HAVING A SPACER AND A LEAKAGE PREVENTER - A developing apparatus includes an organic photo conductor, an OPC frame part to support the organic photo conductor, a developing roller to develop a latent image formed on the organic photo conductor by supplying a developer, a developing roller frame part to support the developing roller, a developer storing part to store the developer and provided with a supplying opening through which the developer is supplied to the developing roller, a spacer removably interposed between the OPC frame part and the developing roller frame part and spacing the OPC frame part from the developing roller frame part such that the organic photo conductor and the developing roller do not contact each other, a leakage preventer removably attached to and sealing the supplying opening, and a connecting part to connect the spacer with the leakage preventer. Thus, the spacer and the leakage preventer are capable of being removed simultaneously. | 04-21-2011 |
| 20120057354 | OPTICAL LENS AND LIGHT SOURCE MODULE, AND STREET LAMP HAVING THE SAME - There are provided an optical lens and a light source module, and a street lamp having the same. The optical lens includes a concave dome shaped inner surface formed to have a similarly-oval shaped lower surface, and formed to include a plurality of light incident surfaces formed to be stepped along the inner surface thereof and stepped surfaces connecting the plurality of light incident surfaces to one another; and an outer surface formed to surround the inner surface. | 03-08-2012 |
| 20120073287 | TURBOCHARGER HAVING ANTI-SURGE VALVE - A turbocharger having an anti-surge valve may include a compressor that may be disposed at an intake line to compress intake air, and the anti-surge valve that selectively fluid-connects the downstream and the upstream of the compressor to circulate the intake air from the downstream to the upstream of the intake line, wherein a passage communicating with the downstream of the intake line may be formed in the anti-surge valve and the intake air flowing through the passage may be supplied to an edge portion outside a rotation center of a blade of the compressor. | 03-29-2012 |
| 20120117964 | INTAKE SYSTEM OF ENGINE - An intake system of an engine may include an intake line that is configured to supply cylinder of an engine with air, an exhaust line that exhaust gas combusted in the cylinder is exhausted, a housing disposed on the intake line and a compressor is disposed therein, the compressor is operated by a turbine disposed on an exhaust line, a recirculation line that recirculates the air from the intake line of a downstream side of the compressor to the intake line of an upstream side of the compressor, and an anti surge valve disposed on the recirculation line to open/close the recirculation line, wherein a length of a first section (l) that is straight from the anti surge valve is longer than two times the outlet diameter (d) of the anti surge valve in the recirculation line that is formed from the anti surge valve to an upstream side of the compressor. | 05-17-2012 |
