Patents by Inventor Yoonmyung Lee
Yoonmyung 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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Publication number: 20240000313Abstract: According to an exemplary embodiment of the present disclosure, a pressure sensing device using a sensor based on a Wheatstone bridge includes: a half Wheatstone bridge unit including two variable resistors of which resistance values are changed according to an environmental change; a variable capacitor unit electrically connected to the half Wheatstone bridge unit and generating RC delays for two variable resistors, respectively; an amplifier amplifying respective charging voltages charged after a time of the respective RC delays; and a comparator comparing the amplified charging voltages and outputting the compared charging voltages as digital values. As a result, an intraocular pressure sensing device is further miniaturized and has smaller power loss.Type: ApplicationFiled: July 3, 2023Publication date: January 4, 2024Applicant: Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Yoonmyung LEE, Donguk SEO
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Publication number: 20230298663Abstract: A neural network method and device are included, A neural network circuit includes a synaptic memory cell including a resistive memory element, which is disposed along an output line and which can have a first resistance value and a second resistance value as a resistance value, the synaptic memory cell generates a column signal, based on the resistance value of the resistive memory element and an input signal received via an input line, a reference memory cell including a reference memory element, which is disposed along a reference line and which has a resistance value that is a ratio of the first and second resistance values, the reference memory cell generates a reference signal, based on the resistance value of the reference memory element and the input signal, and an output circuit generates an output signal for the output line based on the column signal and the reference signal.Type: ApplicationFiled: August 8, 2022Publication date: September 21, 2023Applicants: SAMSUNG ELECTRONICS CO., LTD., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Jung Hoon CHUN, Ji Ho SONG, Yoonmyung LEE, Ju A LEE
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Publication number: 20230252248Abstract: Provided are an in-memory computing apparatus and a method for operating the same, and the in-memory computing apparatus according to an embodiment of the present disclosure may include: an input controller provided with an input signal and configured to generate a first input voltage signal, a second input voltage signal, and a third input voltage signal based on the input signal; a weighting value controller configured to generate a first selection signal and a second selection signal based on a weight precision bit number; a memory array provided with the first input voltage signal, the second input voltage signal, and the third input voltage signal from the input controller, and provided with the first selection signal and the second selection signal from the weighting value controller, and configured to generate a first output charge to a seventh output charge based on the first input voltage signal, the second input voltage signal, the third input voltage signal, the first selection signal, and the secoType: ApplicationFiled: December 5, 2022Publication date: August 10, 2023Applicant: Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Yoonmyung LEE, Eunyoung LEE
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Publication number: 20230186986Abstract: A device with a neural network includes: a synaptic memory cell comprising a resistive memory element, which is disposed along an output line and which has either one of a first resistance value and a second resistance value, and configured to generate a column signal based on the resistive memory element and an input signal in response to the input signal being received through an input line; a reference memory cell comprising a reference memory element, which is disposed along a reference line and which has the second resistance value different from the first resistance value, and configured to generate a reference signal based on the reference memory element and the input signal; and an output circuit configured to generate an output signal for the output line from the column signal and the reference signal.Type: ApplicationFiled: June 1, 2022Publication date: June 15, 2023Applicants: SAMSUNG ELECTRONICS CO., LTD., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Jung-Hoon CHUN, Jiho SONG, Yoonmyung LEE, Jua LEE
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Publication number: 20230053948Abstract: A multiply-accumulator (MAC) circuit includes: a plurality of multipliers each comprising: a field-effect transistor configured to apply an intermediate voltage to a node; a pair of resistive devices having resistance values determined based on the intermediate voltage applied to one ends connected to the node and weight setting voltages applied to the other ends; and a capacitor configured to be charged and discharged with an electric charge by receiving a voltage generated in the node based on a combined resistance value of the pair of resistive devices and input voltages applied individually to the other ends of the pair of resistive devices in response to individual resistance values of the pair of resistive devices being determined; and an output line configured to output a voltage based on electric charges charged to and discharged from the plurality of multipliers.Type: ApplicationFiled: February 17, 2022Publication date: February 23, 2023Applicants: Samsung Electronics Co., Ltd., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Yoonmyung LEE, Soyoun JEONG, Jaerok KIM
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Patent number: 11513548Abstract: An apparatus and method for tracking maximum power are disclosed. The apparatus is configured to track a maximum power at a certain node of an electronic circuit, adjust an impedance of the electronic circuit such that power at the node is maximal, and adjust an impedance of the electronic circuit by comparing power at two points in time to increase power. The apparatus for tracking a maximum power, includes a charge sharing capacitor connected to an initial capacitor in parallel, a first switch disposed between the initial capacitor and an energy harvesting power supply, a second switch disposed between the initial capacitor and the charge sharing capacitor, a third switch disposed between the energy harvesting power supply and a comparator, and a switched-capacitor power converting circuit configured to control the initial capacitor.Type: GrantFiled: March 12, 2021Date of Patent: November 29, 2022Assignees: Samsung Electronics Co., Ltd., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Chisung Bae, Hyungmin Gi, Yeohoon Yoon, Yoonmyung Lee
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Publication number: 20220107661Abstract: An apparatus and method for tracking maximum power are disclosed. The apparatus is configured to track a maximum power at a certain node of an electronic circuit, adjust an impedance of the electronic circuit such that power at the node is maximal, and adjust an impedance of the electronic circuit by comparing power at two points in time to increase power. The apparatus for tracking a maximum power, includes a charge sharing capacitor connected to an initial capacitor in parallel, a first switch disposed between the initial capacitor and an energy harvesting power supply, a second switch disposed between the initial capacitor and the charge sharing capacitor, a third switch disposed between the energy harvesting power supply and a comparator, and a switched-capacitor power converting circuit configured to control the initial capacitor.Type: ApplicationFiled: March 12, 2021Publication date: April 7, 2022Applicants: SAMSUNG ELECTRONICS CO., LTD., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Chisung BAE, Hyungmin GI, Yeohoon YOON, Yoonmyung LEE
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Patent number: 11271758Abstract: A method for physically unclonable function (PUF) cell-pair remapping includes combining PUF cell-pairs between PUF cells in a first array and PUF cells in a second array, acquiring physical parameters for each of the PUF cell-pairs, selecting PUF cell-pairs based on a comparison of the acquired parameters with a first reference, and remapping the selected PUF cell-pairs.Type: GrantFiled: February 11, 2019Date of Patent: March 8, 2022Assignee: Research & Business Foundation Sungkyunkwan UniversityInventors: Yoonmyung Lee, Jongmin Lee, Donghyeon Lee, Yongmin Lee
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Patent number: 11018579Abstract: A boost converter and a cell applicable to the boost converter are provided. The cell comprises a control circuit configured to generate a bottom control signal related to a bottom plate of a capacitor, and a top control signal related to a top plate of the capacitor to connect the capacitor based on one or more operational phases, and a booster configured to convert the top control signal generated by the control circuit, wherein the capacitor is configured to be sequentially connected to voltage levels through switches, based on the bottom control signal and the converted top control signal.Type: GrantFiled: November 8, 2019Date of Patent: May 25, 2021Assignees: Samsung Electronics Co., Ltd., Research & Business Foundation Sungkyunkwan UniversityInventors: Seungchul Jung, Sang Joon Kim, Junyoung Park, Yoonmyung Lee, Hyungmin Gi
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Publication number: 20200382000Abstract: A boost converter and a cell applicable to the boost converter are provided. The cell comprises a control circuit configured to generate a bottom control signal related to a bottom plate of a capacitor, and a top control signal related to a top plate of the capacitor to connect the capacitor based on one or more operational phases, and a booster configured to convert the top control signal generated by the control circuit, wherein the capacitor is configured to be sequentially connected to voltage levels through switches, based on the bottom control signal and the converted top control signal.Type: ApplicationFiled: November 8, 2019Publication date: December 3, 2020Applicants: Samsung Electronics Co., Ltd., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Seungchul JUNG, Sang Joon KIM, Junyoung PARK, Yoonmyung LEE, Hyungmin GI
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Patent number: 10848133Abstract: An oscillator includes a constant current generator configured to generate a constant current by maintaining a predetermined potential difference between both a first end and a second end of a resistor, and an oscillating element configured to output a clock signal corresponding to a charge and discharge cycle of a capacitor based on a bias current corresponding to the constant current.Type: GrantFiled: February 6, 2019Date of Patent: November 24, 2020Assignees: Samsung Electronics Co., Ltd., Research & Business Foundation Sungkyunkwan UniversityInventors: Jonghan Kim, Chisung Bae, Jaemin Choi, Yoonmyung Lee, Jung-Hoon Chun
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Publication number: 20190386615Abstract: An oscillator includes a constant current generator configured to generate a constant current by maintaining a predetermined potential difference between both a first end and a second end of a resistor, and an oscillating element configured to output a clock signal corresponding to a charge and discharge cycle of a capacitor based on a bias current corresponding to the constant current.Type: ApplicationFiled: February 6, 2019Publication date: December 19, 2019Applicants: SAMSUNG ELECTRONICS CO., LTD., Research & Business Foundation SUNGKYUNKWAN UNIVERSITYInventors: Jonghan KIM, Chisung BAE, Jaemin CHOI, Yoonmyung LEE, Jung-Hoon CHUN
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Patent number: 10483985Abstract: An oscillator using a supply regulation loop and a method of operating the oscillator are provided.Type: GrantFiled: December 7, 2017Date of Patent: November 19, 2019Assignees: Samsung Electronics Co., Ltd., Research & Business Foundation Sungkyunkwan UniversityInventors: Chisung Bae, Sangjoon Kim, Yoonmyung Lee, Jaehong Jung, Jung-Hoon Chun
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Publication number: 20190253266Abstract: A method for physically unclonable function (PUF) cell-pair remapping includes combining PUF cell-pairs between PUF cells in a first array and PUF cells in a second array, acquiring physical parameters for each of the PUF cell-pairs, selecting PUF cell-pairs based on a comparison of the acquired parameters with a first reference, and remapping the selected PUF cell-pairs.Type: ApplicationFiled: February 11, 2019Publication date: August 15, 2019Applicant: Research & Business Foundation Sungkyunkwan UniversityInventors: Yoonmyung LEE, Jongmin LEE, Donghyeon LEE, Yongmin LEE
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Publication number: 20180212610Abstract: An oscillator using a supply regulation loop and a method of operating the oscillator are provided.Type: ApplicationFiled: December 7, 2017Publication date: July 26, 2018Applicants: SAMSUNG ELECTRONICS CO., LTD., Research & Business Foundation SUNGKYUNKWAN UNIVER SITYInventors: Chisung Bae, Sangjoon Kim, Yoonmyung Lee, Jaehong Jung, Jung-Hoon Chun
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Patent number: 9979284Abstract: A self-oscillating DC-DC converter structure is proposed in which an oscillator is completely internalized within the switched-capacitor network. This eliminates power overhead of clock generation and level shifting and enables higher efficiency at lower power levels. Voltage doublers are cascaded to form a complete energy harvester with a wide load range from 5 nW to 5 ?W and self-starting operation down to 140 mV. Because each doubler is self-oscillating, the frequency of each stage can be independently modulated, thereby optimizing the overall conversion efficiency.Type: GrantFiled: February 5, 2015Date of Patent: May 22, 2018Assignee: The Regents of The University of MichiganInventors: Wanyeong Jung, Sechang Oh, Suyoung Bang, Yoonmyung Lee, Dennis Sylvester, David T. Blaauw
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Patent number: 9716381Abstract: An electrostatic discharge clamp circuit is provided for low power applications. The clamp circuit includes: a detection circuit, a bias circuit and a shunting circuit having at least one shunt transistor. The detection circuit is configured to detect an occurrence of an electrostatic charge on a power supply node and trigger discharge of the electrostatic charge through the shunting circuit. The bias circuit is coupled between the detection circuit and the shunting circuit and applies a bias voltage to the gate terminal of the shunt transistor. During an electrostatic discharge event, the bias circuit is configured to generate a bias voltage that is substantially equal to the supply voltage; whereas, during the absence of an electrostatic discharge event, the bias circuit is configured to generate a bias voltage that is substantially half of the supply voltage.Type: GrantFiled: September 19, 2014Date of Patent: July 25, 2017Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGANInventors: Yen-po Chen, Yoonmyung Lee, Jae-Yoon Sim, Massimo Alioto, Dennis Sylvester, David Blaauw
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Publication number: 20170170722Abstract: A self-oscillating DC-DC converter structure is proposed in which an oscillator is completely internalized within the switched-capacitor network. This eliminates power overhead of clock generation and level shifting and enables higher efficiency at lower power levels. Voltage doublers are cascaded to form a complete energy harvester with a wide load range from 5 nW to 5 ?W and self-starting operation down to 140 mV. Because each doubler is self-oscillating, the frequency of each stage can be independently modulated, thereby optimizing the overall conversion efficiency.Type: ApplicationFiled: February 5, 2015Publication date: June 15, 2017Inventors: Wanyeong JUNG, Sechang OH, Suyoung BANG, Yoonmyung LEE, Dennis SYLVESTER, David T. BLAAUW
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Patent number: 9429627Abstract: An electronic device has an energy storage device and circuitry supplied with a storage device voltage from the energy storage device. A supervisor circuit enables the circuitry in response to the storage device exceeding an enable threshold voltage. The supervisor circuit detects a resistance parameter which is indicative of an internal resistance of the energy storage device and adjusts the enable threshold voltage based on the resistance parameter.Type: GrantFiled: June 5, 2014Date of Patent: August 30, 2016Assignee: The Regents of the University of MichiganInventors: In Hee Lee, Yoonmyung Lee, Dennis Michael Sylvester, David Theodore Blaauw
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Patent number: 9335972Abstract: A true random number generator comprises a ring oscillator which is triggered to start oscillating in a first mode of oscillation at an oscillation start time. The first mode of oscillation will eventually collapse to a second mode of oscillation dependent on thermal noise. A collapse time from the oscillation start time to the time at which the oscillator collapses to the second mode is measured, and this can be used to determine a random number. The TRNG can be synthesized entirely using standard digital techniques and is able to provide high randomness, good throughput and energy efficiency.Type: GrantFiled: November 29, 2013Date of Patent: May 10, 2016Assignee: The Regents of the University of MichiganInventors: Kaiyuan Yang, Dennis Michael Sylvester, David Theodore Blaauw, David Alan Fick, Michael B. Henry, Yoonmyung Lee