Chung, Daejeon-City
Boheung Chung, Daejeon-City KR
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20090119745 | SYSTEM AND METHOD FOR PREVENTING PRIVATE INFORMATION FROM LEAKING OUT THROUGH ACCESS CONTEXT ANALYSIS IN PERSONAL MOBILE TERMINAL - A system for preventing private information from leaking out through access context analysis in a personal mobile terminal includes a private information manager that receives a private information leakage prevention policy, divides the policy into a plurality of private information leakage prevention rules, and transmits the plurality of rules to individual modules, respectively; a context analyzer that performs access context information analysis to obtain context information, when detecting a packet corresponding to a first rule, and transmits the context information; a packet analyzer that receives the context information, monitors packets transmitted to the outside through packet analysis, and transmits filtering information when detecting a packet corresponding to a second rule; and a private information leakage preventing unit that receives the filtering information and determines whether to allow or drop a packet corresponding to a third rule. | 05-07-2009 |
20090158033 | METHOD AND APPARATUS FOR PERFORMING SECURE COMMUNICATION USING ONE TIME PASSWORD - The invention relates to a communication method and system using a one time password (OTP). The communication system includes: a user computer that has an OTP generator for generating the OTP provided therein; a service server that performs user authentication using user information and an OTP value input from the user computer, and communicates with the user computer using the encoded data that is associated with the OTP value, when the user authentication succeeds; and an OTP integrated authentication server that verifies the OTP value between the user computer and the service server. | 06-18-2009 |
Byounghyun Chung, Daejeon-City KR
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20090058613 | METHOD AND APPARATUS FOR COMMUNICATION BETWEEN READERS HAVING DUAL SENSITIVITY MODES - Provided is a method for communication with between readers having dual sensitivity modes for avoiding conflict between readers arising from interference each other when simultaneously used in a limited space. The method for communication between a tag and a reader using dual sensitivity modes for avoiding conflict between the reader and the tag includes: initializing the reader to a normal sensitivity mode; temporarily selecting a frequency channel by the reader; checking whether or not a different reader uses the selected frequency channel; repeatedly selecting another frequency channel if the other readers occupy the selected frequency channel; switching to a reduced sensitivity mode if the other readers do not occupy the selected frequency channel; and communicating with the tag by the reader in the reduced sensitivity mode. | 03-05-2009 |
Byunghyun Chung, Daejeon-City KR
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20090058612 | METHOD AND APPARATUS FOR AVOIDING COLLISION BETWEEN EACH OF RADIO FREQUENCY IDENTIFICATION READERS - Provided are a method and an apparatus for avoiding a collision between each of radio frequency identification (RFID) readers. The method and the apparatus divide the RFID readers into first RFID readers and second RFID readers according to a maximum output level, and set first frequency channels for the first RFID readers and second frequency channels for the second RFID readers, set frequency channel disposition information for each of the first RFID readers, generate a channel holding signal in each of the first frequency channels, and if a frequency channel usage request or a frequency channel return request is received from one of the first RFID readers, stop generating or generate the channel holding signal in a frequency channel related to the frequency channel usage or return request. In this manner, the collision between each of the RFID readers is avoided by preventing the second RFID readers from using the first frequency channels for the first RFID readers. Also, the method and the apparatus can efficiently manage frequency channels by controlling a ratio of the number of the first frequency channels to be used by the first RFID readers and the number of the second frequency channels to be used by the second RFID readers, according to usage frequency. | 03-05-2009 |
Hwan Seok Chung, Daejeon-City KR
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20100027996 | MULTI-DEGREE CROSS-CONNECTOR SYSTEM, OPERATING METHOD AND OPTICAL COMMUNICATION NETWORK USING THE SAME - Provided are a network node which has a wavelength switching cross-connection function and can thus interconnect paths of a wavelength-division-multiplexed optical signal and convert wavelengths, and an operating method of the network node. Accordingly, it is possible to provide a multi-degree cross-connection system having a simple structure at lower cost by allowing transmission of optical signals supposed not to be added/dropped at a network node without converting them into electrical signals and performing O/E conversion or E/O conversion only on optical signals supposed to be added/dropped at a network node. In addition, it is possible to increase the expandability of networks by regenerating degraded signals and which can effectively utilize bandwidths by grooming low-speed electrical digital hierarchy signals and transmitting them as high-speed optical signals. Moreover, it is possible to increase the availability of network resources by performing wavelength conversion without the need of additional wavelength converters. Furthermore, it is possible to prevent multiplexed optical signals from being degraded by filtering even when the multiplexed optical signals are not demultiplexed into wavelengths. Still furthermore, it is possible to perform a multicast operation on input wavelengths. | 02-04-2010 |
20100329684 | CHANNEL EXPRESS/ADD OPTICAL MODULE AND CHANNEL EXPRESS/ADD METHOD IN OPTICAL ADD/DROP MULTIPLEXER NODE USING THE SAME - Provided are a channel express/add optical module and a method of channel express/add in an optical add/drop multiplexer node using the channel express/add optical module. The channel express/add optical module comprises: a multiplexer/demultiplexer which demultiplexes a multiplexed optical signal having a plurality of wavelengths into individual wavelength optical signals or multiplexes a plurality of different wavelength optical signals; a plurality of 1×2 switches each of which includes a first output end that guides the demultiplexed different wavelength optical signals to output them thereto and a second output end through which new wavelength optical signals; and a plurality of reflectors each of which reflects the optical signal output to the first output end so that the optical signal is feedback to the multiplexer/demultiplexer via the 1×2 switches. | 12-30-2010 |
Hyun-Kyu Chung, Daejeon-City KR
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20100195752 | TRANSMITTER/RECEIVER FOR CONTROLLING MULTIUSER MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM AND METHOD THEREOF - Provided are a method of controlling a multi-user multiple input multiple output (MIMO) system and a transmitter/receiver used in the method. In the method, it can be determined whether feedback information is fed back according to the feedback information type rather than being indiscriminately provided to a transmitter, and then only a necessary feedback information type is transmitted, thereby increasing system capacity while reducing feedback load. | 08-05-2010 |
Kyo-Ii Chung, Daejeon-City KR
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20100067690 | SPA-RESISTANT LEFT-TO-RIGHT RECODING AND UNIFIED SCALAR MULTIPLICATION METHODS - Provided is a scalar multiplication method unified with a simple power analysis (SPA) resistant left-to-right recording in a crypto system based on an elliptic curve and a pairing. The scalar multiplication method includes: recording an L-digit secret key k′ from a radix-r n-digit secret key k by comparing two successive elements with each other from the most significant digit with duplication allowed in order to generate the L-digit secret key k′; and performing scalar multiplication between the secret key k and a point P on an elliptic curve to output a scalar multiplication value Q=kP using the secret key k′. | 03-18-2010 |
Kyoil Chung, Daejeon-City KR
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20090116645 | FILE SHARING METHOD AND SYSTEM USING ENCRYPTION AND DECRYPTION - Disclosed is a file sharing method and system using encryption and decryption. A client hashes keywords related to files using a symmetric key algorithm, and encodes the hashed keywords. Then, the client encodes the files using the hashed keywords, and uploads to a file sharing server a ciphertext D including an encoded file m and the encoded keywords KW | 05-07-2009 |
20090157716 | APPARATUS AND METHOD FOR ACQUIRING DATA FROM MEMORY OF TERMINAL - The present invention relates to an apparatus and method for acquiring data stored in a memory of a terminal. Binary data is converted to a new case file and the case file is stored. When meaningful data is extracted, a copy of the case file is generated and the integrity of the copied case file is checked. Then, meaningful data is extracted. A report is generated to correspond to the analyzed meaningful data and is output to a printer and a monitor. Therefore, according to the present invention, all of the data stored in the memory of the terminal are acquired and are converted into the case file in a new format, thereby generating legitimate evidence material for a legal investigation in respect to a legal aspect to be used by investigators. | 06-18-2009 |
Kyo-Il Chung, Daejeon-City KR
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20090097717 | Method and Apparatus for User Authentication Using Face Image - A user authentication method and apparatus using a face image are provided. The method includes transforming a face image in a normalized spatial domain into frequency-domain data, extracting valid transform coefficients from the frequency-domain data based on energy-concentrated region information, extracting a feature vector from the extracted valid transform coefficients, and performing user authentication by comparing the extracted feature vector with a previously registered feature vector. Accordingly, it is possible to perform user authentication using a face image while using a minimum data dimension, thereby improving the speed and precision thereof. | 04-16-2009 |
20100001840 | METHOD AND SYSTEM FOR AUTHENTICATING RFID TAG - Provided are a method and a system for authenticating a radio frequency identification (RFID) tag, by which an RFID reader and an authentication server authenticate the RFID tag by using a cryptographic operation and a protocol. | 01-07-2010 |
20100241626 | CYBERTAG FOR LINKING INFORMATION TO DIGITAL OBJECT IN IMAGE CONTENTS, AND CONTENTS PROCESSING DEVICE, METHOD AND SYSTEM USING THE SAME - A CyberTAG for linking information to a digital object in an image contents, and an image contents display device, a method and a system using the same are provided. The CyberTAG includes: a tag ID field which serves to identify the digital object in the image contents and to link the digital object to additional information of the digital object; an object generation location field which serves to identify a location at which the digital object is generated while the image contents is displayed; a time field which serves to identify a time when the digital object appears while the image contents is displayed; and a modification value field which serves to trace the location of the digital object from when the digital object is generated to when the digital object disappears. | 09-23-2010 |
Kyo-Ll Chung, Daejeon-City KR
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20110041046 | APPARATUS AND METHOD FOR PROTECTING RFID DATA - An apparatus and method for protecting radio frequency identification (RFID) data in a communication between a RFID tag and a RFID reader are provided. In the apparatus and method for protecting RFID data, message header information transmitted while communicating the RFID tag and the RFID reader is used to perform an encryption operation for important data, thereby protecting the important data included in the RFID tag. In the present invention, information of the RFID tag can be protected from an illegitimate eavesdropper and an ill-intentioned and unusual message can be detected, thereby ensuring the security of a RFID system. | 02-17-2011 |
Soyoung Chung, Daejeon-City KR
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20090131717 | COMPOSITION FOR PROTECTING SKIN - Disclosed are a composition for protecting skin and uses thereof. The composition comprises sphingomyelin as an active ingredient and protects the skin by inhibiting skin aging, treating a skin wound and improving a skin barrier. | 05-21-2009 |
Tae-Jin Chung, Daejeon-City KR
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20090039943 | MIXER AND TRANSCEIVER HAVING THE MIXER - Provided are a mixer and a transceiver having the mixer. The mixer includes: an local oscillation (LO) differential signal generator converting an input LO signal into a differential signal; and a mixing unit receiving the LO differential signal as a first input and a first signal having a first frequency as a second input and performing differential amplification on the LO differential signal and the first signal to output a second signal having a second frequency. | 02-12-2009 |
20100151799 | TRANSCEIVER USING MILLIMETER-WAVE - Provided is a transceiver using a millimeter-wave (MM-wave). The transceiver determines output power of a transmitting signal according to a receiving signal of a receiving end in the same device so that a possible loss value occurring in the air may be predicted. By doing so, performance of a whole link budget may be enhanced, and the transmitting signal may be rapidly controlled. | 06-17-2010 |
20100283550 | MULTI-OUTPUT OSCILLATOR USING SINGLE OSCILLATOR AND METHOD OF GENERATING MULTIPLE OUTPUTS USING THE SAME - Provided are a multi-output oscillator using a single oscillator, and a method of generating multiple outputs. The multi-output oscillator includes: an oscillator outputting the single frequency; a multiplier multiplying the single frequency to output a first frequency; a first frequency divider dividing the single frequency by a first division factor; a first mixer outputting a second frequency by mixing an output of the first frequency divider and an output of the multiplier; a second frequency divider dividing the single frequency by a second division factor; a second mixer mixing the output of the second frequency divider and the output of the first mixer to output a third frequency; and a third mixer mixing the output of the second frequency divider and the output of the multiplier to output a fourth frequency. | 11-11-2010 |
Woon Jin Chung, Daejeon-City KR
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20090046353 | GAIN-CLAMPED OPTICAL AMPLIFYING APPARATUS USING FIBER RAMAN AMPLIFIER HAVING RAMAN CAVITY - Provided is a gain-clamped (GC) optical amplifier using a fiber Raman amplifier (FRA) having a Raman cavity. The FRA having a Raman cavity comprises a Raman fiber module (RFM) amplifying and outputting an input optical signal and a resonant cavity generating a Raman laser and a gain clamping laser (GC laser), wherein the resonant cavity is formed as a feedback loop between an input terminal and an output terminal of the RFM. Accordingly, a gain of an optical signal propagating along a core of RFM keeps a constant value regardless of input signal intensity by generating the GC laser for gain clamping between a wavelength band of the Raman laser and a gain band of input signals. | 02-19-2009 |
Young-Uk Chung, Daejeon-City KR
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20100039981 | HANDOVER METHOD USING RELAY STATION HAVING HANDOVER CONTROL FUNCTION AND MULTI-HOP RELAY SYSTEM - Provided are a handover method using a relay station having a handover control function and a multi-hop relay system. When handover of mobile stations connected to a relay station is required, the relay station negotiates handover of the mobile stations with a base station by exchanging a handover request message and a handover response message. Upon execution of handover of the mobile stations, the relay station collects handover results of the mobile stations and transmits the handover results to the base station. The base station then updates information about the handed-over mobile stations. | 02-18-2010 |
20100087196 | METHOD OF DEREGISTERING RELAY STATION AND MULTI-HOP RELAY SYSTEM FOR THE METHOD - A method of deregistering a relay station and a multi-hop relay system for the method are provided. In order to deregister the relay station, a base station ends a handover of mobile stations connected to the relay station, and informs the relay station accordingly. When the handover of the mobile stations is ended, the relay station performs a deregistration procedure. Messages that already exist are used as messages necessary for the method. | 04-08-2010 |
Yunkoo Chung, Daejeon-City KR
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20100056934 | APPARATUS AND METHOD FOR MEASURING PULSE WAVE - A pulse wave measuring apparatus disposes a plurality of light emitting elements and a plurality of light receiving elements in a line, measures pulse wave signals at locations where the light emitting elements and the light receiving elements are located, when the pulse wave measuring apparatus is worn on a wrist of the person to be examined, and determines an optimal pulse wave signal among the plurality of measured pulse wave signals to measure pulse waves. An optimal pulse wave can be detected from an optimal pulse wave signal that is detected by a combination of the light emitting element and the light receiving element that are adjacent to a blood vessel of a person to be examined. | 03-04-2010 |
Yun-Su Chung, Daejeon-City KR
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20090097717 | Method and Apparatus for User Authentication Using Face Image - A user authentication method and apparatus using a face image are provided. The method includes transforming a face image in a normalized spatial domain into frequency-domain data, extracting valid transform coefficients from the frequency-domain data based on energy-concentrated region information, extracting a feature vector from the extracted valid transform coefficients, and performing user authentication by comparing the extracted feature vector with a previously registered feature vector. Accordingly, it is possible to perform user authentication using a face image while using a minimum data dimension, thereby improving the speed and precision thereof. | 04-16-2009 |