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Chang, Daejeon-City
Beom Hwan Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20090094699 | APPARATUS AND METHOD OF DETECTING NETWORK ATTACK SITUATION - Provided is an apparatus for detecting a network attack situation. The apparatus includes an alarm receiver receiving a plurality of alarms raised in a network to which the alarm receiver is connected, converting the alarms into predetermined alarm data, and outputting the alarm data; an alarm processor analyzing an attack situation in the network based on attributes of the alarm data and a number of times that the alarm data is generated; a memory storing basic data needed to analyze the state of the network and providing the basic data to the alarm processor; and an interface transmitting the result of the analysis by the alarm processor to an external device, receiving a predetermined critical value from the external device, which is a basis for determining the occurrence of the attack situation, and outputting the critical value to the alarm processor such that the alarm processor can store the critical value in the memory. Equal numbers of hash engines and detection engines for processing the alarms in the network to the number of data groups classified as network attack situations are formed in a line. Therefore, a network attack situation can be detected in real time based on a great number of alarms indicating intrusion detection. | 04-09-2009 |
Dong-Pil Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20100015941 | BROADBAND ACTIVE BALUN AND BALANCED MIXER USING REACTIVE FEEDBACK - A broadband active balun using reactive feedback and a balanced mixer using the balun are provided. The broadband active balun comprises a common gate FET having a source connected to an input terminal, a gate connected to the ground, and a drain connected to a first output terminal; a reactive impedance element having one end connected to the drain of the common gate FET and the other end connected to one of the gate and the source of the common gate FET, and a common source FET having a gate connected to the input terminal, a source connected to the ground and a drain connected to a second output terminal. Accordingly, the active balun has a small physical size and a wide frequency band. | 01-21-2010 |
Kap-Seok Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20090067370 | CELL SEARCH METHOD IN OFDM CELLULAR SYSTEM, FRAME TRANSMISSION METHOD THEREOF, AND FORWARD LINK FRAME STRUCTURE - Provided are a cell search method, a frame transmission method thereof, and a forward link frame structure thereof. The cell search method used by a terminal to search a target cell using reception signals received from a plurality of base stations, each base station transmitting a frame of its cell, in an Orthogonal Frequency-Division Multiplexing (OFDM) cellular system comprising a plurality cells to which a cell-specific scrambling code is assigned includes: detecting a hopping pattern of the target cell using reception sync channel symbols, which are signals corresponding to sync channel symbol positions of the reception signals, wherein the frame of each cell comprises M sync channel symbols code-hopped according to a hopping pattern of the cell, where M is a natural number equal to or greater than 2, each hopping pattern containing M sync channel code sequences and respectively corresponding to each code group to which a scrambling code of each cell belongs, and an arbitrary hopping pattern used in the OFDM cellular system differs from a cyclically shifted result of the hopping pattern, other hopping patterns, or cyclically shifted results of the other hopping patterns; and detecting a code group of the target cell based on the detected hopping pattern. Accordingly, a cell search time and the complexity of the cell search can be reduced. | 03-12-2009 |
| 20090080385 | CELL SEARCH METHOD, FORWARD LINK FRAME TRANSMISSION METHOD, APPARATUS USING THE SAME AND FORWARD LINK FRAME STRUCTURE - Provided are a cell search method, a forward link frame transmission method, an apparatus using the methods, and a forward link frame structure in an Orthogonal Frequency Division Multiplexing cellular system, wherein the time it takes to perform a cell search and the complexity of the cell search can be reduced. The cell search apparatus includes a sync acquirer which receives a signal according to a forward link frame comprising a plurality of sync channel symbols each having different intervals between the adjacent sync channel symbols and achieves synchronization of the sync channel symbols using a sync channel of the received signal, and a boundary detector which detects a frame boundary using an interval pattern between the sync channel symbols, based on the achieved synchronization. | 03-26-2009 |
| 20090219882 | CELL SEARCH METHOD, FORWARD LINK FRAME TRANSMISSION METHOD, APPARATUS USING THE SAME AND FORWARD LINK FRAME STRUCTURE - Provided are a cell search method, a forward link frame transmission method, an apparatus using the methods, and a forward link frame structure. The cell search apparatus includes a sync acquirer acquiring synchronization of sync channel symbols using a sync channel of a forward link, and a group detector detecting at least one hopping codeword element belonging to a hopping codeword of a target cell from a forward link signal containing sync channel symbols sequence-hopped using a hopping codeword corresponding to a code group to which a scrambling code of each cell belongs based on the acquired synchronization, and detecting a code group of the target cell based on the detected hopping codeword element, wherein the hopping codewords are orthogonal to a cyclic shift operation. Accordingly, a cell search time and the complexity of the cell search can be reduced. | 09-03-2009 |
Kuyoung Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20090138698 | METHOD OF SEARCHING ENCRYPTED DATA USING INNER PRODUCT OPERATION AND TERMINAL AND SERVER THEREFOR - The present invention relates to a method of searching data for a plurality of keywords when a user encrypts the data and stores the encrypted data in an unsecured server. The user transmits the inner product value of a search keyword set to a sever, and the server compares the received inner product value to an inner product value of a stored index set. When a document for which the two inner product values are matched with each other, the server returns the document. | 05-28-2009 |
| 20100153403 | METHOD FOR DATA ENCRYPTION AND METHOD FOR CONJUNCTIVE KEYWORD SEARCH OF ENCRYPTED DATA - A server provides the user's desired data without the server knowing the contents or keywords of data by using a method of searching the desired data without decrypting the encrypted data, such that the privacy for the important data of the user can be secured. Also, the present invention shortens the operation time when searching the encrypted data, such that it can prevent the degradation in efficiency due to excess operation involved in the previous existing methods based on the pairing operation. | 06-17-2010 |
Kyung-Hi Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20110059700 | ADAPTIVE TRANSMISSION AND RECEIVING METHOD AND DEVICE IN WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE ANTENNAS - Disclosed is an adaptive transmit and receive method and device in a multiple-antenna wireless communication system. A transmit mode comprises different main transmit modes each of which includes one or both of a sub-transmit mode based on STBC and a sub-transmit mode based on SM. A receiver calculates an STBC performance parameter and a SM performance parameter, and a transmitter uses the parameters to determine a main transmit mode with maximum data rates and select a sub-transmit mode for minimizing power consumption. The transmitter channel-encodes, modulates and antenna-maps input data according to the selected transmit mode, and outputs results to the receiver. The receiver antenna/symbol-demodulates and channel-decodes the received data. | 03-10-2011 |
Sung-Cheol Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20090019284 | AUTHENTICATION METHOD AND KEY GENERATING METHOD IN WIRELESS PORTABLE INTERNET SYSTEM - An authentication method and authorization key generation method in a wireless portable Internet system is provided. In a wireless portable Internet system, the base station and the subscriber station share an authorization key when an authentication process is performed according to a predetermined authentication method negotiated therebetween. Particularly, the subscriber station and the base station perform an additional authentication process including an authorization key-related parameter and a security-related parameter and exchanges a security algorithm and SA (Security Association) information. In addition, an authorization key is derived from one or more basic key obtained through various authentication processes as an input key of an authorization key generation algorithm. Therefore, reliability of a security related parameter received from the receiving node can be enhanced and an authorization key having a hierarchical and secure structure can be provided. | 01-15-2009 |
| 20100061339 | HANDOVER METHOD WITH MOBILE RELAY STATION - There is provided a handover method by a mobile relay station (MRS) or base station (BS) so as to effectively perform a handover of the MRS and mobile stations (MSs) in an environment in which data is communicated through a relay of the MRS. There is also provided a handover method capable of securing backward compatibility of an MS during a handover. There is provided a handover method in which an MRS is considered. It is possible to improve the efficiency of the handover by allowing handovers of the MRS and MSs to which the MRS relays to be initiated by the MRS or BS. It is possible to secure the backward compatibility of the MSs by allowing the MRS to generate and manage a mapping relation between information on communication identifiers (CIDs) of the MSs, which are changed during the handover, and information on previous CIDs of the MSs. | 03-11-2010 |
| 20100075663 | METHOD FOR REPORTING A CHANNEL QUALITY INFORMATION IN WIRELESS COMMUNICATION SYSTEM - Provided is a method of reporting channel quality information in a wireless communication system. A relay station (RS) measures an uplink signal of a mobile station (MS) to obtain a measurement result, and transmits a report message including the measurement result and identification information of the MS to a base station (BS). | 03-25-2010 |
| 20110261960 | METHOD FOR ALLOCATING AUTHORIZATION KEY IDENTIFIER FOR WIRELESS PORTABLE INTERNET SYSTEM - A method and authentication apparatus for sharing information for identifying an Authorization Key (AK) with a Base Station (BS) in a subscriber station are provided. The method includes, in the subscriber station, sharing a root key with the BS by performing an authentication with the BS, sharing an AK derived from the root key with the BS, sharing an AK sequence number of the AK with the BS, and sharing an AK Identifier (AKID) of the AK with the BS. The AK sequence number is generated by a sequence number of the root key. The AKID is generated by a parameter including the AK, the AK sequence number, a Medium Access Control (MAC) address of the subscriber station, and a BS Identifier (BSID) of the BS. | 10-27-2011 |
Sun Hwa Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20120095183 | METHODS OF PREPARING WHOLLY AROMATIC LIQUID CRYSTALLINE POLYESTER RESIN AND WHOLLY AROMATIC LIQUID CRYSTALLINE POLYESTER RESIN COMPOUND WITH CONSTANT MELT VISCOSITY - A method of preparing a wholly aromatic liquid crystalline polyester resin and a method of preparing a wholly aromatic liquid crystalline polyester resin compound. The method of preparing the wholly aromatic liquid crystalline polyester resin includes condensation poly-merizing raw 1 monomers including aromatic hydroxy carboxylic acid and a mixture of aromatic diol and aromatic dicarboxylic acid in a predetermined molar ratio. In addition, the method of preparing the wholly aromatic liquid crystalline polyester resin compound includes the method of preparing the wholly aromatic liquid crystalline polyester resin | 04-19-2012 |
Sun Hyok Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 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 |
Won-Seok Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20100108649 | PROCESSING APPARATUS USING ULTRASHORT PULSE LASER - The present invention relates to an ultrashort pulse laser processing device. The ultrashort pulse laser includes a stage a transfer member, a front confocal microscope, a front laser generating unit, and a front highpowered lens. A sample is provided on the stage to be processed, the transfer member transfers the stage, and the front confocal microscope is provided above the stage. The front laser generating unit is provided between the front confocal microscope and the stage to generate an ultrashort pulse laser, and the front high-powered lens focuses the laser provided from the front laser generating unit. | 05-06-2010 |
Yong Min Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20080284437 | Phantom for Diffusion Tensor Imaging - A phantom for Diffusion Tensor Imaging (DTI) to measure the main physical quantities of diffusion tensors, such as diffusion anisotrophy, a diffusion principal axis and a route of the diffusion principal axis, and to evaluate the accuracy of DTI are provided. The phantom for diffusion tensor imaging includes: an outer container providing a space; materials for diffusion measurement located in the space of the outer container and formed of bunches of microtubes; and materials for fixing located in the space of the outer container to fix the materials for diffusion measurement to a specific location. | 11-20-2008 |
Yoonseop Chang, Daejeon-City KR
| Patent application number | Description | Published |
|---|---|---|
| 20100132045 | APPARATUS AND METHOD FOR RIGHT MANAGEMENT OF DIGITAL CONTENTS - Disclosed is an apparatus for right management of digital contents includes: a digital right manager that creates a usage right of digital contents on the basis of received right information; and a contents manager that provides the digital contents in accordance with the created usage right, wherein the contents manager includes a contents packing unit that receives the usage right created from the digital right manager, and extracts and packages components of the digital contents in accordance with the usage right, and a contents providing unit that receives packaged digital contents created from the contents packaging unit and provides the digital contents to a contents using device. | 05-27-2010 |
| 20100142802 | APPARATUS FOR CALCULATING 3D SPATIAL COORDINATES OF DIGITAL IMAGES AND METHOD THEREOF - Provided is a digital photographing apparatus including: an image acquiring unit that acquires images by photographing a subject; a sensor information acquiring unit that acquires positional information, directional information, and posture information of the digital photographing apparatus at the time of photographing a subject; a device information acquiring unit that acquires device information of the digital photographing apparatus at the time of photographing a subject; and a spatial coordinates calculator that calculates 3D spatial coordinates for photographed images using the acquired positional information, directional information, posture information, and device information. | 06-10-2010 |
| 20100162411 | APPARATUS AND METHOD FOR MANAGING HYBRID CONTENTS GENERATED BY COMBINING MULTIMEDIA INFORMATION AND GEOSPATIAL INFORMATION - An apparatus for managing hybrid contents generated by combining multimedia information and geospatial information includes an input/output unit that is connected with a contents storage and a contents using device to control input/output of the hybrid contents; a structure calculating unit that generates the hybrid contents having a layer structure using an XML format by interconnecting the multimedia information having the layer structure using the XML format provided from the input/output unit and the geospatial information having the layer structure using the XML format; and a relationship establishing unit that is connected with the input/output unit or the structure calculating unit to establish and provide the relationship of the multimedia information having the layer structure, the geospatial information having the layer structure, and the hybrid contents. | 06-24-2010 |