Patents by Inventor Dong Hahk Lee
Dong Hahk Lee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9424251Abstract: A method of extracting the semantic distance from the mathematical sentence and classifying the mathematical sentence by the semantic distance, includes: receiving a user query; extracting at least one keyword included in the received user query; and extracting a semantic distance by, indexing one or more of natural language tokens and mathematical equation tokens including semantic information, extracting the semantic distance, between the at least one extracted keyword and the one or more indexed semantic information by referring indexed information, and acquiring a similarity of the received user query and the semantic information.Type: GrantFiled: June 6, 2013Date of Patent: August 23, 2016Assignee: SK TELECOM CO., LTD.Inventors: Keun Tae Park, Yong Gil Park, Hyeongin Choi, Nam Sook Wee, Doo Seok Lee, Jung Kyo Sohn, Haeng Moon Kim, Dong Hahk Lee
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Patent number: 9372828Abstract: The present disclosure relates to a method and apparatus for inputting equations. An equation input apparatus includes a learning context recognizer for extracting learning context information regarding a learner; a target equation group extractor for generating a target equation group including target mathematical symbols based on the extracted learning context information; and a predicted equation provider for providing a predicted mathematical symbol list relating to information, input or selected from the target equation group by user command, and for reflecting an equation selected from the predicted mathematical symbol list in the input or selected information.Type: GrantFiled: November 3, 2011Date of Patent: June 21, 2016Assignee: SK TELECOM CO., LTD.Inventors: Seung Lock Choe, Nam Sook Wee, Doo Seok Lee, Jung Kyo Sohn, Haeng Moon Kim, Yong Gil Park, Keun Tae Park, Dong Hahk Lee
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Publication number: 20130295537Abstract: The present disclosure provides a mathematics education service system includes a problem storing unit to store at least one mathematical problem; a transform method executing unit to execute a plurality of problem transform methods; a problem separating unit to collect equations used in the mathematical problem, separate one or more terms from the collected equations by parsing the collected equations, and separate a constant and a variable from each of the separated one or more terms; and a problem generating unit to generate another applied problem of the mathematical problem by applying at least one of the problem transform methods (i) to the collected equations, and (ii) to the constant and the variable of each of the separated one or more terms, wherein the system is configured to provide the mathematical problem and the generated another problem are provided to a learner terminal.Type: ApplicationFiled: July 11, 2013Publication date: November 7, 2013Inventors: Keun Tae PARK, Nam Sook Wee, Doo Seok Lee, Jung Kyo Sohn, Haeng Moon Kim, Yong Gil Park, Dong Hahk Lee
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Publication number: 20130290390Abstract: The present disclosure relates to a method and apparatus for inputting equations. An equation input apparatus includes a learning context recognizer for extracting learning context information regarding a learner; a target equation group extractor for generating a target equation group including target mathematical symbols based on the extracted learning context information; and a predicted equation provider for providing a predicted mathematical symbol list relating to information, input or selected from the target equation group by user command, and for reflecting an equation selected from the predicted mathematical symbol list in the input or selected information.Type: ApplicationFiled: November 3, 2011Publication date: October 31, 2013Applicant: SK TELECOM CO LTDInventors: Seung Lock Choe, Nam Sook Wee, Doo Seok Lee, Jung Kyo Sohn, Haeng Moon Kim, Yong Gil Park, Keun Tae Park, Dong Hahk Lee
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Publication number: 20130275122Abstract: A method of extracting the semantic distance from the mathematical sentence and classifying the mathematical sentence by the semantic distance, includes: receiving a user query; extracting at least one keyword included in the received user query; and extracting a semantic distance by, indexing one or more of natural language tokens and mathematical equation tokens including semantic information, extracting the semantic distance, between the at least one extracted keyword and the one or more indexed semantic information by referring indexed information, and acquiring a similarity of the received user query and the semantic information.Type: ApplicationFiled: June 6, 2013Publication date: October 17, 2013Inventors: Keun Tae Park, Yong Gil Park, Hyeongin Choi, Nam Sook Wee, Doo Seok Lee, Jung Kyo Sohn, Haeng Moon Kim, Dong Hahk Lee
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Publication number: 20130268263Abstract: The present disclosure provides an apparatus and method for processing a natural language and a mathematical formula. The apparatus includes a natural language and mathematical formula input unit configured to receive a natural language and a mathematical formula inputted; an information generation unit configured to generate parsing semantic information of the mathematical formula from combined data composed of the natural language combined with the mathematical formula; an operation information extraction unit configured to extract operation information generated by using a logical condition from the combined data; a natural language and mathematical formula structuralizing unit configured to analyze, classify in terms of specific meaning and recombine the combined data; an operation structuralizing unit configured to structuralize the operation information; and a natural language and mathematical formula indexing unit configured to index the combined data.Type: ApplicationFiled: June 3, 2013Publication date: October 10, 2013Inventors: Yong Gil PARK, Keun Tae Park, Dong Hahk Lee, Hyeongin Choi, Nam Sook Wee, Doo Seok Lee, Jung Kyo Sohn, Haeng Moon Kim
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Publication number: 20130260359Abstract: The present disclosure relates to an apparatus and method for diagnosing a learning ability. The apparatus for diagnosing learning ability includes a receiving unit configured to receive from a terminal chapter-related information or problem-related information which is desirably diagnosed by a learner, and a semantic information generator configured to generate, responsive to each piece of problem information included in the chapter-related information or problem-related information, semantic information with structural information of the problem information, the problem information having subject-specific problem information distinguished from the semantic information.Type: ApplicationFiled: October 31, 2011Publication date: October 3, 2013Applicant: SK Telecom Co., Ltd.Inventors: Keun Tae Park, Nam Sook Wee, Doo Seok Lee, Jung Kyo Sohn, Haeng Moon Kim, Yong Gil Park, Seung Lock Choe, Dong Hahk Lee, Jong Heon Lee, Myung Sung Lee
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Patent number: 8442102Abstract: A chip equalization apparatus and method for selecting cluster signals from broadcast signals being continuously received in multi-path channels for extracting a plurality of cluster signals from among the received broadcast signals and using a plurality of chip equalizers each having a tap coefficient update part for updating the tap coefficients of the selected cluster signals when the equalization outputs are combined to compensate the broadcast signals and provide low power consumption and efficient equalization for use in a satellite broadcasting receiving system.Type: GrantFiled: December 27, 2007Date of Patent: May 14, 2013Assignee: SK Telecom Co., Ltd.Inventors: Goon Seop Lee, Sung Hoon Lee, Jong Tae Ihm, Jae Hwang Yu, Dong Hahk Lee, Ku Ik Chung, Jin Hee Han
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Patent number: 8407741Abstract: The present invention relates to a system and method for providing a supplementary information service related to broadcast content. The system for providing a supplementary information service related to broadcast content being broadcasted to user terminal comprises a Time Information Creating Server for Identifying a start time information of the broadcast content; and a Supplementary Information Service Providing Server for receiving the start time information of the broadcast content from the Time Information Creating Server, calculating elapsed time for a specific scene based on the start time information, and providing a user terminal with an supplementary information corresponding to the scene based on the elapsed time, through a communication network.Type: GrantFiled: November 20, 2007Date of Patent: March 26, 2013Assignee: SK Planet Co., Ltd.Inventors: Goon Seop Lee, Dong Hahk Lee, Jae Hwang Yu, Jong Tae Ihm, Se Hyun Oh, Ku Ik Chung
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Patent number: 8341671Abstract: Disclosed herein is a system and method for providing a supplementary information associated with a broadcast content. The system provides a supplementary information associated with a specific broadcast program in the broadcast content by means of a supplementary information server, wherein the supplementary information server comprises a broadcasting receiving unit for receiving the broadcast content; a synchronization information unit for storing a synchronization information of the supplementary information associated with the specific broadcast program; a video comparison unit for comparing screens of the broadcast content with a previously stored scene change screen of the specific broadcast program and setting a start time of the specific broadcast program; a supplementary information extracting unit for calculating an elapsed time from the start time of the specific broadcast program to a specific screen and extracting the supplementary information corresponding to the elapsed time.Type: GrantFiled: January 8, 2008Date of Patent: December 25, 2012Assignee: SK Telecom Co., Ltd.Inventors: Goon Seop Lee, Dong Hahk Lee, Jae Hwang Yu, Jong Tae Ihm, Se Hyun Oh, Kang Il Koh
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Patent number: 8320353Abstract: Disclosed is a method and system for estimating an adaptive joint channel in a CDMA system based on TDD. The method includes the steps of a) receiving activity information of a mobile terminal; b) parsing the activity information, and transmitting a midamble sequence to the mobile terminal when a result of the parsing shows that the mobile terminal is in an ON state; c) conducting adaptive joint channel estimation by using the midamble sequence in the mobile terminal; and d) conducting adaptive joint detection by using a channel impulse response of the mobile terminal, obtained as a result of conducting the adaptive joint channel estimation. The method and system decreases the complexity in channel estimation and additionally increases the accuracy of channel estimation by reducing transmission power consumption and eliminating unnecessary interference.Type: GrantFiled: June 19, 2008Date of Patent: November 27, 2012Assignee: SK Telecom Co., Ltd.Inventors: Dong-Hahk Lee, Ra-Mi Lee, Seong-Soo Park, Sang-Shin Lee, Jae-Hwang Yu, Jong-Tae Ihm, Duk-Kyung Kim
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Patent number: 8072940Abstract: In the data call handover method, the mobile communication terminal registers a Mobile Internet Protocol (MIP address) through an asynchronous mobile communication network and receives data call service when a data call connection event is initiated by the mobile communication terminal. It is determined whether the mobile communication terminal has entered an area in which the asynchronous mobile communication network and a synchronous mobile communication network overlap. If the mobile communication terminal has entered the overlap area, it is determined whether to perform handover to the synchronous mobile communication network based on the intensity of a signal of the asynchronous mobile communication network. If handover is to be performed, a data call between the mobile communication terminal and the synchronous mobile communication network is established and the MIP address is registered.Type: GrantFiled: January 5, 2005Date of Patent: December 6, 2011Assignee: SK Telecom Co., Ltd.Inventors: Seong-Soo Park, Dong-Hahk Lee
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Publication number: 20100325667Abstract: The present invention relates to a system and method for providing a supplementary information service related to broadcast content. The system for providing a supplementary information service related to broadcast content being broadcasted to user terminal comprises a Time Information Creating Server for Identifying a start time information of the broadcast content; and a Supplementary Information Service Providing Server for receiving the start time information of the broadcast content from the Time Information Creating Server, calculating elapsed time for a specific scene based on the start time information, and providing a user terminal with an supplementary information corresponding to the scene based on the elapsed time, through a communication network.Type: ApplicationFiled: November 20, 2007Publication date: December 23, 2010Applicant: SK TELECOM. CO., LTDInventors: Goon Seop Lee, Dong Hahk Lee, Jae Hwang Yu, Jong Tae Ihm, Se Hyun Oh, Ku Ik Chung
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Publication number: 20100322116Abstract: Disclosed is a method and system for estimating an adaptive joint channel in a CDMA system based on TDD. The method includes the steps of a) receiving activity information of a mobile terminal; b) parsing the activity information, and transmitting a midamble sequence to the mobile terminal when a result of the parsing shows that the mobile terminal is in an ON state; c) conducting adaptive joint channel estimation by using the midamble sequence in the mobile terminal; and d) conducting adaptive joint detection by using a channel impulse response of the mobile terminal, obtained as a result of conducting the adaptive joint channel estimation. The method and system decreases the complexity in channel estimation and additionally increases the accuracy of channel estimation by reducing transmission power consumption and eliminating unnecessary interference.Type: ApplicationFiled: June 19, 2008Publication date: December 23, 2010Applicant: SK Telecom Co., Ltd.Inventors: Dong-Hahk Lee, Ra-Mi Lee, Seong-Soo Park, Sang-Shin Lee, Jae-Hwang Yu, Jong-Tae Ihm, Duk-Kyung Kim
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Publication number: 20100295992Abstract: Disclosed herein is a system and method for providing a supplementary information associated with a broadcast content. The system provides a supplementary information associated with a specific broadcast program in the broadcast content by means of a supplementary information server, wherein the supplementary information server comprises a broadcasting receiving unit for receiving the broadcast content; a synchronization information unit for storing a synchronization information of the supplementary information associated with the specific broadcast program; a video comparison unit for comparing screens of the broadcast content with a previously stored scene change screen of the specific broadcast program and setting a start time of the specific broadcast program; a supplementary information extracting unit for calculating an elapsed time from the start time of the specific broadcast program to a specific screen and extracting the supplementary information corresponding to the elapsed time.Type: ApplicationFiled: January 8, 2008Publication date: November 25, 2010Applicant: SK TELECOM. CO., LTDInventors: Goon Seop Lee, Dong Hahk Lee, Jae Hwang Yu, Jong Tae Ihm, Se Hyun Oh, Kang Il Koh
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Patent number: 7697437Abstract: The present invention relates to a method of determining at least one traffic route in an MPLS (Multi-Protocol Label Switching) network.Type: GrantFiled: June 21, 2002Date of Patent: April 13, 2010Assignee: SK Telecom Co., Ltd.Inventors: Yong Sik Shin, Si Hoon Ryu, Dong Hahk Lee, Jong Tae Ihm
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Publication number: 20100068989Abstract: Disclosed is a chip equalization apparatus and method thereof, which selects some clusters with high signal power among broadcast signal clusters continuously received in multi-path channels to extract a plurality of cluster signals, equalizes each of the input cluster signals, and combines all equalization outputs again, thereby leading to low power consumption and efficient equalization. The chip equalization apparatus for use in a satellite broadcasting receiving system comprising: a cluster signal extracting part for extracting a plurality of cluster signals from received broadcast signals; and a plurality of chip equalizers receiving cluster signals from the cluster signal extracting part and updating tap coefficients to compensate the broadcast signals.Type: ApplicationFiled: December 27, 2007Publication date: March 18, 2010Applicant: SK TELECOM CO., LTD.Inventors: Goon Seop Lee, Sung Hoon Lee, Jong Tae Ihm, Jae Hwang Yu, Dong Hahk Lee, Ku Ik Chung, Jin Hee Han
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Patent number: 7519363Abstract: The present invention relates to a roaming method between a WLAN and a cellular network which can interwork the WLAN and the cellular network on the basis of a mobile IP system for smooth roaming.Type: GrantFiled: November 29, 2002Date of Patent: April 14, 2009Assignee: SK Telecom Co., Ltd.Inventors: Yong-Sik Shin, Si-Hoon Ryu, Dong-Hahk Lee
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Patent number: 7394772Abstract: A point-to-multipoint traffic routing method that routes a multicast traffic through a determined tree on an MPLS network. A node on an MPLS network conducting a point-to-multipoint traffic routing method receives a message with an object including topology information on a determined tree, determines whether itself is a copy node or not based on the topology information, and copies, if determined to be a copy node, the received message to transmit to at least two nodes specified as next by the topology information. The present routing method ensures smooth operations of a copy and a merge node as well as an overall network.Type: GrantFiled: November 27, 2002Date of Patent: July 1, 2008Assignee: SK Telecom Co., Ltd.Inventors: Yong Sik Shin, Si Hoon Ryu, Dong Hahk Lee, Jong Tae Ihm
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Publication number: 20080137775Abstract: Provided are a method and apparatus for hierarchical modulation and demodulation in a Digital Multimedia Broadcasting (DMB) system. The method for hierarchical modulation in a digital broadcast signal transmitter includes the steps of: receiving a first broadcast signal and a second broadcast signal from outside, and encoding the broadcast signals by a first method and a second method, respectively; synthesizing the encoded first and second broadcast signals; determining a modulation point using a constellation diagram of an I-Q plane corresponding to the synthesized signal; and hierarchically phase-shift modulating the synthesized signal using the determined modulation point. Here, in the I-Q plane, the modulation point is deviated by a predetermined deviation angle from a phase axis passing through a modulation point of the first broadcast signal and an origin of the I-Q plane.Type: ApplicationFiled: October 31, 2007Publication date: June 12, 2008Inventors: Tae Hoon KIM, In Ki LEE, Seung Hyun CHOI, Cheon In OH, Dae Ig CHANG, Ho Jin LEE, Sung Hoon LEE, Goon Seop LEE, Dong Hahk LEE, Jae Hwang YU