Patents by Inventor Lynn Choi
Lynn Choi 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: 11939680Abstract: A method includes applying a material coating on a surface of a machine component using a thermal spray, wherein the material coating is formed from a combination of a hardfacing material and aluminum-containing particles. The method also includes thermally treating the material coating to generate an oxide layer comprising aluminum from the aluminum-containing particles, wherein the oxide layer is configured to reduce oxidation of the hardfacing material.Type: GrantFiled: March 8, 2023Date of Patent: March 26, 2024Assignee: GE Infrastructure Technology LLCInventors: Krishnamurthy Anand, Surinder Singh Pabla, Lacey Lynn Schwab, Biju Dasan, Seung-Woo Choi, Sathisha Chikkabikkodu Hanum, Ravikiran Kopparthi, David Vincent Bucci
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Patent number: 11448494Abstract: A device that generates a location estimation model is provided. The location estimation model generator device includes a map generator part configured to generate a magnetic field map, which includes magnetic field values corresponding respectively to the coordinates of an indoor space; a data generator part configured to generate learning data by implementing the magnetic field map; and a learning part configured to generate a location estimation model by artificial neural network (ANN) learning implementing the learning data.Type: GrantFiled: May 7, 2018Date of Patent: September 20, 2022Assignee: Korea University Research and Business FoundationInventors: Lynn Choi, Ho Jun Jang
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Publication number: 20190049231Abstract: A device for generating a location estimation model is disclosed. The location estimation model generator device according to an embodiment of the invention includes: a map generator part configured to generate a magnetic field map, which includes magnetic field values corresponding respectively to the coordinates of an indoor space; a data generator part configured to generate learning data by using the magnetic field map; and a learning part configured to generate a location estimation model by artificial neural network (ANN) learning using the learning data.Type: ApplicationFiled: May 7, 2018Publication date: February 14, 2019Applicant: KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATIONInventors: Lynn CHOI, Ho Jun JANG
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Patent number: 8856227Abstract: A communication method and apparatus using a virtual sink node in a wireless sensor network, in which location information about a destination node is acquired by a source node. If the location of the destination node is out of a transmission range of the source node, data including the location information about the destination node are transmitted from the source node to one of nodes adjacent to the source node, where the one node is typically closest to the destination node. The data are transmitted from the one node to another one of nodes adjacent to the one node, where another node is closest to the destination node, until the destination node is located within a transmission range of the one node. If the destination node is located within the transmission range of the one node, the data are transmitted from the one node to the destination node.Type: GrantFiled: February 13, 2009Date of Patent: October 7, 2014Assignees: Samsung Electronics Co., Ltd., Korea UniversityInventors: Hyo Hyun Choi, Sun Gi Kim, Lynn Choi, Jae Kyun Jung
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Patent number: 8467327Abstract: Provided are a communication method and system for sensor network. In reporting event occurrence in a real-time sensor network application, a cycle time is divided into an event announcement period and a data transmission period to provide real-time transmission performance and energy efficiency. Each of the periods is again divided into the number of slots equal to the maximum depth of a network. Respective nodes sequentially operate according to their depths in a routing tree during the event announcement period to receive the signal transmitted from the lower node. To remove sleep delay, a slot next to the signal reception slot becomes a signal transmission slot. A node sensed an event transmits a signal informing event occurrence during its signal transmission slot, and this signal includes only the address of the transmission node. When a signal does not exist in the event announcement period, no traffic occurs in the data transmission period and the upper nodes maintain a sleep state.Type: GrantFiled: September 2, 2010Date of Patent: June 18, 2013Assignees: Electronics and Telecommunications Research Institute, Korea University Research & Business FoundationInventors: Seung Ki Hong, Jong Arm Jun, Cheol Sig Pyo, Sang Hun Lee, Lynn Choi
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Patent number: 8174997Abstract: A communication method and apparatus is disclosed that uses a received signal strength indicator (RSSI). In a sensor network including a plurality of nodes, a first node of the plurality of nodes receives a signal transmitted from a second node of the plurality of nodes, at least once. The first node also manages a link state with the second node according to the RSSI of the received signal. Therefore, the first node can receive signals from the plurality of nodes and then predict whether the second node moves. The first node can also predict a link state after the second node is moved so that communication can be performed through a link in a good state. Accordingly, the communication quality and the network performance of a network are enhanced.Type: GrantFiled: February 13, 2009Date of Patent: May 8, 2012Assignees: Samsung Electronics Co., Ltd., Korea UniversityInventors: Hyo Hyun Choi, Sun Gi Kim, Lynn Choi, Sang Hoon Lee
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Publication number: 20110138023Abstract: Provided is a programming method of network nodes in sensor network. The programming method receives a code to be programmed in the network nodes. The programming method determines the kind of the received code. The programming method selects a programming scheme according to the determined kind of the code. The programming method programs the received code in the network nodes based on the selected programming scheme.Type: ApplicationFiled: November 23, 2010Publication date: June 9, 2011Inventors: Seung-ki Hong, Jong-Arm Jun, Cheol Sig Pyo, Sang-Hun Lee, Lynn Choi
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Publication number: 20110051645Abstract: Provided are a communication method and system for sensor network. In reporting event occurrence in a real-time sensor network application, a cycle time is divided into an event announcement period and a data transmission period to provide real-time transmission performance and energy efficiency. Each of the periods is again divided into the number of slots equal to the maximum depth of a network. Respective nodes sequentially operate according to their depths in a routing tree during the event announcement period to receive the signal transmitted from the lower node. To remove sleep delay, a slot next to the signal reception slot becomes a signal transmission slot. A node sensed an event transmits a signal informing event occurrence during its signal transmission slot, and this signal includes only the address of the transmission node. When a signal does not exist in the event announcement period, no traffic occurs in the data transmission period and the upper nodes maintain a sleep state.Type: ApplicationFiled: September 2, 2010Publication date: March 3, 2011Applicants: Electronics and Telecommunications Research Institute, Korea University Research & Business FoundationInventors: Seung Ki HONG, Jong Arm JUN, Cheol Sig PYO, Sang Hun LEE, Lynn CHOI
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Patent number: 7814333Abstract: Methods and apparatuses for detecting and recovering from a buffer overflow attack are provided. A method of recovering an operation state of a processor from a buffer overflow attach includes: detecting whether a buffer overflow attack is made on any write operation while storing write operations that are potential targets of buffer overflow attacks in a predetermined location instead of an original destination to store write operations; storing the contents stored in the predetermined location at a predetermined interval in the original destination for storing write operations if no buffer overflow attack is detected and discarding unsafe write operations subsequent to a buffer overflow attack if a buffer overflow attack is detected; and ignoring the unsafe write operations subsequent to the buffer overflow attack if a buffer overflow attack is detected.Type: GrantFiled: March 18, 2005Date of Patent: October 12, 2010Assignee: Korea University Industry and Academy Cooperation FoundationInventors: Lynn Choi, Yong Shin
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Publication number: 20090207783Abstract: A communication method and apparatus using a virtual sink node in a wireless sensor network, in which location information about a destination node is acquired by a source node. If the location of the destination node is out of a transmission range of the source node, data including the location information about the destination node are transmitted from the source node to one of nodes adjacent to the source node, where the one node is typically closest to the destination node. The data are transmitted from the one node to another one of nodes adjacent to the one node, where another node is closest to the destination node, until the destination node is located within a transmission range of the one node. If the destination node is located within the transmission range of the one node, the data are transmitted from the one node to the destination node.Type: ApplicationFiled: February 13, 2009Publication date: August 20, 2009Inventors: Hyo Hyun Choi, Sun Gi Kim, Lynn Choi, Jae Kyun Jung
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Publication number: 20090207748Abstract: A communication method and apparatus is disclosed that uses a received signal strength indicator (RSSI). In a sensor network including a plurality of nodes, a first node of the plurality of nodes receives a signal transmitted from a second node of the plurality of nodes, at least once. The first node also manages a link state with the second node according to the RSSI of the received signal. Therefore, the first node can receive signals from the plurality of nodes and then predict whether the second node moves. The first node can also predict a link state after the second node is moved so that communication can be performed through a link in a good state. Accordingly, the communication quality and the network performance of a network are enhanced.Type: ApplicationFiled: February 13, 2009Publication date: August 20, 2009Inventors: Hyo Hyun Choi, Sun Gi Kim, Lynn Choi, Sang Hoon Lee
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Patent number: 7480302Abstract: A packet classification method through hierarchical rulebase partitioning. The packet classification method for searching for a rule having a highest priority and matching among a plurality of rules included in a specified rulebase with respect to a packet input from an external network and processing the packet according to the searched rule. The method includes: a preprocessing step of partitioning the rulebase into a plurality of independent sub-rulebases based on a specified condition and producing a hash table on the basis of the sub-rulebases; and a classification step of classifying the packet by searching the hash table using a hash key extracted from a packet header of the inputted packet and mapping the packet on the sub-rulebase corresponding to the packet.Type: GrantFiled: May 2, 2005Date of Patent: January 20, 2009Assignees: Samsung Electronics Co., Ltd., Korea University Industry and Academy Corporation FoundationInventor: Lynn Choi
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Publication number: 20070180524Abstract: Methods and apparatuses for detecting and recovering from a buffer overflow attack are provided. A method of recovering an operation state of a processor from a buffer overflow attach includes: detecting whether a buffer overflow attack is made on any write operation while storing write operations that are potential targets of buffer overflow attacks in a predetermined location instead of an original destination to store write operations; storing the contents stored in the predetermined location at a predetermined interval in the original destination for storing write operations if no buffer overflow attack is detected and discarding unsafe write operations subsequent to a buffer overflow attack if a buffer overflow attack is detected; and ignoring the unsafe write operations subsequent to the buffer overflow attack if a buffer overflow attack is detected.Type: ApplicationFiled: March 18, 2005Publication date: August 2, 2007Applicant: KOREA UNIVERSITY INDUSTRY AND ACADEMY COOPERATIONInventors: Lynn Choi, Yong Shin
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Publication number: 20050254502Abstract: A packet classification method through hierarchical rulebase partitioning. The packet classification method for searching for a rule having a highest priority and matching among a plurality of rules included in a specified rulebase with respect to a packet input from an external network and processing the packet according to the searched rule. The method includes: a preprocessing step of partitioning the rulebase into a plurality of independent sub-rulebases based on a specified condition and producing a hash table on the basis of the sub-rulebases; and a classification step of classifying the packet by searching the hash table using a hash key extracted from a packet header of the inputted packet and mapping the packet on the sub-rulebase corresponding to the packet.Type: ApplicationFiled: May 2, 2005Publication date: November 17, 2005Inventor: Lynn Choi
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Patent number: 6233690Abstract: A method for gating a clock signal to an execution unit on long latency memory stalls monitors a stall signal, a scoreboard (data) hazard signal, a resource hazard signal, and a data return signal. The clock signal is decoupled from the execution unit when the stall and data hazard signals are asserted for a selected interval and the data return and resource hazard signals are not asserted for a selected interval.Type: GrantFiled: September 17, 1998Date of Patent: May 15, 2001Assignee: Intel CorporationInventors: Lynn Choi, Harshvardhan Sharangpani