Chae, Daejeon-City
Heesung Chae, Daejeon-City KR
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20090312871 | SYSTEM AND METHOD FOR CALCULATING LOCATION USING A COMBINATION OF ODOMETRY AND LANDMARKS - Disclosed is a system and method for calculation a location in a real-time manner using a combination of odometry and artificial landmarks. The system for calculating a location comprising a landmark detection unit detecting an image coordinates value of the artificial landmark corresponding to a location in a two-dimensional image coordinate system with respect to a mobile robot from an image obtained by photographing a specific space where the artificial landmarks are provided; a landmark identification unit comparing a predicted image value of the artificial landmark, obtained by converting a location coordinates value of the artificial landmark into an image coordinates value corresponding to the location in the two-dimensional image coordinate system with respect to a location coordinates value corresponding to a location in an actual three-dimensional spatial coordinate system of the mobile robot, with an image coordinates value detected by the landmark detection unit to detect the location coordinates value of the artificial landmark; a first location calculation unit calculating a current location coordinates value of the mobile robot using a predetermined location calculation algorithm based on the image coordinates value detected by the landmark detection unit and the location coordinates value detected by the landmark identification unit; a second location calculation unit calculating a current location coordinates value of the mobile robot using a predetermined location calculation algorithm based on odometry information of the mobile robot; and a main control unit updating the current location coordinates value of the mobile robot, using the location coordinates value calculated by the first location calculation unit when the location coordinates value calculated by the first location calculation unit exists, or using the location coordinate value obtained from the second location calculation unit when the location coordinates value calculated by the first location calculation unit does not exist. | 12-17-2009 |
20100027558 | HYBRID IMPLICIT TOKEN CARRIER SENSING MULTIPLE ACCESS/COLLISION AVOIDANCE PROTOCOL - Provided is a distributed and asynchronous implicit token carrier sense multiple access/collision avoidance (CSMA/CA) protocol guaranteeing quality of service for both real time and non-real time traffic. The implicit token CSMA/CA protocol allocates a band in an entire bandwidth to voice traffic and allows the remaining bands to be used for data traffic. The implicit token CSMA/CA protocol includes applying a token passing protocol to transmit voice traffic in real time by having a band in an entire bandwidth allocated using a predetermined data frame and applying a CSMA/CA mechanism to transmit data traffic in non-real time by employing remaining bands not allocated to the voice traffic using another predetermined data frame. | 02-04-2010 |
Jong-Hyun Chae, Daejeon-City KR
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20080302132 | Method and apparatus for separating aromatic dialdehyde - The present invention relates to a method and an apparatus for continuously separating aromatic dialdehyde from a reaction mixture obtained by gas-phase oxidation of dimethylbenzene. The method for continuously separating aromatic dialdehyde includes the steps of congealing aromatic dialdehyde by cooling the gas-phase reaction mixture including the aromatic dialdehyde, which is obtained by gas-phase oxidation of dimethylbenzene, to 5-70° C. and separating the congealed aromatic dialdehyde from the remaining reaction mixture. Using the method and apparatus in accordance with the present invention, aromatic dialdehyde can be effectively and selectively separated from a reaction mixture obtained by gas-phase oxidation of dimethylbenzene in high yield. | 12-11-2008 |
Jongsuk Chae, Daejeon-City KR
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20110006884 | RFID INTERROGATOR CALCULATING ADAPTIVE RETRANSMISISON WAIT TIME AND CONTROL METHOD THEREOF - As an RFID interrogator calculating an adaptive retransmission wait time and a control method thereof, the RFID interrogator includes a collision diagnosis unit that analyzes data on a received signal received during a receive time in correspondence with a transmitted signal from an RF communication unit that can transmit and receive signal to and from one or more tag, verifies whether or not a collision occurs in the received signal, and diagnoses a collision type depending on an analysis result of the data on the received signal; a situational command retransmission portion that determines whether or not the command is retransmitted on the basis of the occurrence of the collision and the collision type received from the collision diagnosis unit; and a random wait time calculation portion that calculates a random wait time for retransmitting the command. | 01-13-2011 |
20110006885 | RFID INTERROGATOR RETRANSMITTING COMMAND DEPENDING ON COLLISION SITUATION AND CONTROL METHOD THEREOF - As an RFID interrogator transmitting a command depending on a collision situation and a control method thereof, the RFID interrogator includes a collision diagnosis unit that analyzes data of a received signal received during a receive time in correspondence with a transmitted signal from an RF communication unit that can transmit and receive signal to and from one or more tag, verifies whether or not a collision occurs in the received signal, and diagnoses a collision type depending on an analysis result of the data of the received signal; and a collision resolution unit that can retransmit a command to the tag through the RF communication unit depending on the collision situation on the basis of whether or not occurrence of the collision or not and the collision type that are received from the collision diagnosis unit. | 01-13-2011 |
20110018691 | RFID INTERROGATOR HAVING COLLISION TYPE IDENTIFICATION FUNCTION AND CONTROL METHOD THEREOF - Disclosed is an RFID interrogator having a collision type identification function and a control method thereof. It verifies whether or not a collision occurs in a received signal by analyzing data of a signal received from an RF communication unit and performs a corresponding collision resolution operation by diagnosing a collision type in accordance with a collision generation means between the corresponding RFID interrogator and other interrogators or a tag. Since all types of collisions that occur between the RFID interrogator and the tag can be identified, a reason for occurrence of the collisions can be rapidly recognized to cope with the reason for the collisions. | 01-27-2011 |
20110084811 | RFID TAG FOR RFID SERVICE AND RFID SERVICE METHOD THEREOF - Disclosed are an RFID tag for an RFID service and an RFID service method thereof. The present invention includes a tag storage unit including a TID memory and a user memory; and a tag controller that inserts and stores a content name field including content name information related to an item attached with the corresponding tag in the user memory, wherein the tag controller inserts the content name information in a tag response signal according to the request of a peripheral RFID interrogator and transmits it or permits an access to the memory in which the content name field is inserted. The present invention includes and stores the content name information in the identification data stored in the RFID tag to allow a user to select only the desired tag when the interrogator simultaneously recognizes a plurality of tags and receive the desired contents through the network, making it possible to give convenience to a user and reduce time and the using fee of the network. | 04-14-2011 |
Miok Chae, Daejeon-City KR
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20100115511 | SYSTEM AND METHOD FOR PROVIDING PERSONALIZATION OF VIRTUAL MACHINES FOR SYSTEM ON DEMAND (SOD) SERVICE - Disclosed is a system for providing personalization of virtual machines for a system on demand (SoD) service includes an SoD server, wherein the SoD server includes an aspect measuring unit that measures user's use habits and aspects with respect to the peripheral devices on the basis of use or not of the peripheral devices; a preference generating unit that calculates preference for each attribute with respect to attributes included in the peripheral devices on the basis of the use habits and aspects measured by the aspect measuring unit; and a configuration unit that calculates satisfaction for each device with respect to peripheral devices which can be used in the virtual machine on the basis of the preference for each attribute calculated by the preference generating unit and configures the peripheral devices of the virtual machine on the basis of the calculated satisfaction for each device. | 05-06-2010 |
20100145872 | SERVER AND METHOD FOR MANAGING HEALTH CLUB - A method for managing a health club according to the present invention includes: receiving member information from mobile terminals of users in a server that is connected to monitors each corresponding to a plurality of health equipments in a wired or wireless manner; setting the monitors to be allocated to the users, which are authenticated as a member, among the monitors by the server; generating a virtual machine that connects between the set monitors and the mobile terminals; and providing contents requested by the users through the set monitors using the virtual machine. | 06-10-2010 |
20100146507 | SYSTEM AND METHOD OF DELIVERY OF VIRTUAL MACHINE USING CONTEXT INFORMATION - There is provided a system of delivery of a virtual machine using context information. The system of delivery of a virtual machine includes: a context information manager that receives one or more user context information from a user terminal device; and a virtual machine generator that generates a virtual machine suitable for the user terminal device in accordance with the one ore more received user context information and outputs the generated virtual machine to the user terminal device. | 06-10-2010 |
Su-Chang Chae, Daejeon-City KR
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20080209298 | Decoding Apparatus and Method Thereof - In a decoding apparatus in a portable Internet terminal, a channel encoded symbol received from a transmitter is decoded by one of a chase-combining scheme and a code-combining scheme selected based on an ID value of the subpacket indicating a start position of the symbol. In this case, the chase-combining scheme is partly used for the encoded symbol of the information bit. With such a mode, decoding can be performed at a low code rate. | 08-28-2008 |
20080250303 | Viterbi Decoder and Method Thereof - The present invention relates to a decoder for tail-biting convolution codes and a method thereof. The decoder receives an encoding bit sequence in a convolutional encoding method from a channel, generates an expanded encoding bit sequence, Viterbi decodes the expanded encoding bit sequence, and generates decoded data. In addition, the decoder selects a central bit sequence of the decoded data, rearranges the central bit sequence, and generates final decoded data. Accordingly, the decoder has a simplified configuration for decoding the bit sequence encoded in the tail biting convolutional encoding method, and the decoder also decodes a bit sequence encoded in a zero-tail convolutional encoding method. | 10-09-2008 |
20100008284 | RELAYING METHOD OF RELAY STATION(RS) USING A DIRECT RELAYING ZONE IN MULTIHOP RELAY SYSTEM - Provided are a method of relaying a data burst in a relay station (RS) of a multi-hop relay (MMR) system using a direct relay zone, and a system using the method. The RS requests a base station to assign the direct relay zone in a frame in which a demodulation and forwarding scheme that demodulates, and then modulates and transmits a data burst is applied, receives an acknowledgement to the request from the base station, and relays a data burst using the frame in which the direct relay zone is assigned. Accordingly, since a data burst can be relayed within one frame, relay latency can be reduced. | 01-14-2010 |
20100061223 | SUBCARRIER ALLOCATION APPARATUS AND METHOD, SUBCARRIER DE-ALLOCATION APPARATUS AND METHOD IN OFDM SYSTEM - A subcarrier allocating apparatus allocating data to be transmitted to a plurality of orthogonal subcarriers in an orthogonal frequency division multiplexing (OFDM) system, the apparatus including: a logical index generator ( | 03-11-2010 |