Patents by Inventor Dong-su Lee

Dong-su 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).

  • Publication number: 20210281045
    Abstract: Disclosed is a terahertz wave generating apparatus. The terahertz wave generating apparatus includes a dual mode laser including a first single mode laser that generates a first beating signal, a gain adjustment region that modulates the first beating signal, and a second single mode laser that generates a second beating signal, and a photomixer that mixes the modulated first beating signal and the second beating signal, and that modulates a current supplied based on a beating frequency of the mixed beating signals to generate a terahertz wave signal, and the gain adjustment region is formed between the first single mode laser and the second single mode laser, and the first beating signal is output from the first single mode laser to the gain adjustment region and is modulated based on a reverse bias voltage supplied to the gain adjustment region.
    Type: Application
    Filed: February 24, 2021
    Publication date: September 9, 2021
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hyun Soo Kim, Kyung Hyun PARK, Eui Su LEE, IL MIN LEE, Kiwon MOON, Dong Woo PARK, Jun-Hwan SHIN
  • Publication number: 20210269900
    Abstract: Present invention is about a transformation-induced plasticity high-entropy alloy which can provide improved mechanical properties compared to those obtained by conventional methods, due to the phase transformation occurring at the time of deformation at a cryogenic temperature. According to the present invention, the high-entropy alloy (HEA) includes 10-35 at % of Co, 3-15 at % of Cr, 3-15 at % of V, 35-48 at % of Fe, and 0-25 at % of Ni (exclusive of 25), and mainly consists of an FCC phase at room temperature, wherein transformation-induced plasticity, in which at least part of the FCC phase changes to a BCC phase, occurs at a cryogenic temperature (?196° C.
    Type: Application
    Filed: March 30, 2018
    Publication date: September 2, 2021
    Applicant: POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Byeong-joo LEE, Sung-hak LEE, Seok-su SOHN, Hyoung-seop KIM, Dong-geun KIM, Yong-hee JO, Won-mi CHOI
  • Publication number: 20210272612
    Abstract: A spatial disturbance that occurs when an access is concentrated in a specific memory area in a volatile semiconductor memory like DRAM is properly solved by a memory controller. The memory controller includes a concentration access detection part generating a concentration access detection signal when an address for accessing a specific memory area among memory areas of volatile semiconductor memory is concentratedly received. In the case that the concentration access detection signal is generated, the memory controller includes a controller for easing or preventing corruption of data which memory cells of the specific memory area and/or memory cells of memory areas adjacent to the specific memory area hold.
    Type: Application
    Filed: May 5, 2021
    Publication date: September 2, 2021
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Kyo Min Sohn, Dong Su Lee, Young Jin Cho, Hyung Woo Choi
  • Publication number: 20210256909
    Abstract: The present disclosure allows removal of the influence by an unstable pixel power voltage by generating or selectively using a gamma voltage according to a gamma reference voltage variable depending on the level of the pixel power voltage.
    Type: Application
    Filed: February 4, 2021
    Publication date: August 19, 2021
    Inventor: Dong Su LEE
  • Patent number: 11024352
    Abstract: A spatial disturbance that occurs when an access is concentrated in a specific memory area in a volatile semiconductor memory like DRAM is properly solved by a memory controller. The memory controller includes a concentration access detection part generating a concentration access detection signal when an address for accessing a specific memory area among memory areas of volatile semiconductor memory is concentratedly received. In the case that the concentration access detection signal is generated, the memory controller includes a controller for easing or preventing corruption of data which memory cells of the specific memory area and/or memory cells of memory areas adjacent to the specific memory area hold.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: June 1, 2021
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Kyo Min Sohn, Dong Su Lee, Young Jin Cho, Hyung Woo Choi
  • Patent number: 11011934
    Abstract: Provided is a wireless power transmitting unit capable of auto-tuning according to impedance change. The wireless power transmitting unit according to an embodiment can stabilize the operation of the amplifier by changing the resonance frequency of the resonator without measuring the phase information about the resonator.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: May 18, 2021
    Assignee: MAPS, INC.
    Inventors: Jong Tae Hwang, Ik Soo Jeon, Dong Su Lee, Hyun Ick Shin, Joon Rhee
  • Patent number: 10998813
    Abstract: A modular multilevel converter (MMC) includes multiple converter arms, each converter arm having: N submodules connected to each other in series, N being an integer equal to or greater than 2; and a circuit opening unit connected to the N submodules in series to open a circuit of the converter arm, wherein the N submodules has n submodules including full-bridge circuits and N?n submodules including half-bridge circuits, n being less than N.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: May 4, 2021
    Assignees: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Hee Jin Kim, Dong Su Lee, Kyeon Hur, Jae Sik Kang, Sang Min Kim, Jong Seo Na
  • Patent number: 10915024
    Abstract: A fiber-type electronic device comprising a pattern for electronic devices stacked on a fiber filament substrate is provided. It is possible to manufacture an electronic device directly on a fiber filament substrate by applying the pattern for electronic devices. Thus, it can be widely used for wearable devices and the like. The pattern for electronic devices is manufactured by a method for forming a pattern for electronic devices comprising an exposure process using a maskless exposure apparatus. Thus, it is possible to manufacture a pattern for electronic devices on a fiber filament substrate through a continuous process and thus to increase the process efficiency.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: February 9, 2021
    Assignee: Korea Institute of Science and Technology
    Inventors: Sunbin Hwang, Dong Su Lee, Dae-Young Jeon, Sukang Bae, Seoung-Ki Lee, Sang Hyun Lee, Tae-Wook Kim
  • Patent number: 10904304
    Abstract: The present invention relates to a cloud streaming service system, a data compressing method for preventing memory bottlenecking, and a device for same and, particularly, to a technology that: can prevent memory bottlenecking by compressing data when the transmitted amount of original buffer data exceeds a reference value, based on a system memory bandwidth; can provide a cloud streaming service by applying an order of priority by service type according to whether the processing limit, for the number of simultaneous connecting entities that can be processed by one server, is reached during a cloud streaming service; and can test whether a sever that provides a cloud streaming service is operating normally and whether a connection error occurs.
    Type: Grant
    Filed: July 8, 2019
    Date of Patent: January 26, 2021
    Assignee: SK PLANET CO., LTD.
    Inventors: Tae-Meon Bae, Hyun-Sik Na, Hong-Seo Yun, Jung-Keun Yang, Dong-Su Lee
  • Publication number: 20200335975
    Abstract: A method of controlling output levels of an MMC converter to reduce fluctuation in a power grid frequency, which adjusts an output level of the MMC converter in response to a change in a power grid frequency of a power grid system in the MMC converter connected to a grid system, is proposed. The method includes a detection step of detecting a power grid frequency of a grid connected to the MMC converter in real time, a comparison step of comparing the detected power grid frequency with a preset reference power grid frequency, and an adjustment step of adjusting a number of output levels of the MMC converter to reduce a difference between the detected power grid frequency and the reference power grid frequency when the detected power grid frequency and the reference power grid frequency are different from each other.
    Type: Application
    Filed: December 21, 2018
    Publication date: October 22, 2020
    Inventors: Hee Jin KIM, Dong Su LEE, Kyeon HUR, Jae Sik KANG, Sang Min KIM
  • Patent number: 10811077
    Abstract: A memory device a plurality of memory banks, a hammer address manager, and a refresh controller. The hammer address manager manages access addresses with respect to the plurality of memory banks and provides a hammer address for a hammer refresh operation among the access addresses, the hammer address being the access address that is accessed more than other access addresses. The refresh controller generates a hammer refresh address signal based on the hammer address, the hammer refresh address signal corresponding to a row that is physically adjacent to a row corresponding to the hammer address such that the row physically adjacent to the row corresponding to the hammer address is refreshed by the hammer refresh operation.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: October 20, 2020
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hoon Shin, Do-Yeon Kim, Ho-Young Song, Dong-Su Lee
  • Publication number: 20200274395
    Abstract: Provided is a wireless power receiving unit with a self-regulation rectifier. In one embodiment, the wireless power receiving unit includes a resonator configured to receive wireless power; and a self-regulation rectifier unit including a rectifier configured to apply a rectifier output voltage to a load by converting alternating-current (AC) power received from the resonator into direct-current (DC) power, and a switching device located at a rear end of the rectifier and configured to self-regulate the rectifier output voltage.
    Type: Application
    Filed: April 7, 2017
    Publication date: August 27, 2020
    Applicant: Maps, Inc.
    Inventors: Jong Tae HWANG, Hyun Ick SHIN, Sung Min PARK, Min Jung KO, Dong Su LEE, Jong Hoon LEE, Ki Woong JIN, Joon RHEE
  • Publication number: 20200274397
    Abstract: Provided is a wireless power transmitting unit capable of auto-tuning according to impedance change. The wireless power transmitting unit according to an embodiment can stabilize the operation of the amplifier by changing the resonance frequency of the resonator without measuring the phase information about the resonator.
    Type: Application
    Filed: June 12, 2017
    Publication date: August 27, 2020
    Applicant: MAPS, INC.
    Inventors: Jong Tae HWANG, Ik Soo JEON, Dong Su LEE, Hyun Ick SHIN, Joon RHEE
  • Publication number: 20200244236
    Abstract: Disclosed are a zero voltage switching control device of an amplifier, and a wireless power transmission device. The zero voltage switching control device, according to one embodiment of the present invention, comprises: a switch voltage detection unit which, when a first switch of an amplifier is turned on, detects a drain voltage and generates a switching voltage; an error amplification unit which receives the switching voltage as an input and amplifies an error by comparing the switching voltage with a reference voltage; a loop filter which receives an output voltage of the error amplification unit as an input, and outputs a control voltage; and a duty control unit which, according to the control voltage, controls a duty of a first switch driving signal so that the first switch undergoes zero voltage switching.
    Type: Application
    Filed: September 20, 2016
    Publication date: July 30, 2020
    Applicant: MAPS, INC
    Inventors: Jong Tae HWANG, Dong Su LEE, Ki-Woong JIN, Min Jung KO, Hyun Ick SHIN, Joon RHEE
  • Patent number: 10714981
    Abstract: Disclosed are an apparatus for protecting a wireless communication device and a wireless communication device comprising the same. The protection apparatus according to one embodiment comprises: a determination unit for detecting a power supply voltage of a wireless communication device for wirelessly transmitting and receiving a signal by generating a magnetic field or reacting therewith, and determining a wireless charging state from the outside when an increase in the power supply voltage, which is greater than or equal to a preset threshold, is detected; and a protection unit for protecting the wireless communication device from a power signal for wireless charging when the wireless charging condition is determined through the determination unit.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: July 14, 2020
    Assignee: MAPS, INC.
    Inventors: Jong Tae Hwang, Sung Min Park, Min Jung Ko, Dong Su Lee, Jong Hoon Lee, Ki-Woong Jin, Hyun Ick Shin, Joon Rhee
  • Patent number: 10693328
    Abstract: A wireless power transfer standard selector of a power receiving device and a method therefor are disclosed. A wireless power transfer standard selector according to one embodiment comprises: a frequency sensor for sensing an input frequency of a rectifier; a boot attempt counter for counting and storing the number of bootings in which an output voltage of a power converter is generated and then disappears; and a selection unit for selecting a wireless power transfer standard method by using the input frequency sensed through the frequency sensor and/or the number of bootings counted through the boot attempt counter.
    Type: Grant
    Filed: December 2, 2016
    Date of Patent: June 23, 2020
    Assignee: MAPS, INC.
    Inventors: Jong Tae Hwang, Dong Su Lee, Jong Hoon Lee, Ki Woong Jin, Hyun Ick Shin, Joon Rhee
  • Patent number: 10673319
    Abstract: The present invention relates to an MMC converter system which can quickly cut off fault current by installing a plurality of disconnecting switch units on a line connected between two MMC converter devices. The MMC converter system comprises: a first MMC converter device including a plurality of serially connected sub modules; a second MMC converter device including a plurality of serially connected sub modules; a first disconnecting switch unit installed on a line between the first and second MMC converter devices; and a second disconnecting switch unit connected in series to the first disconnecting switch unit on the line, wherein each of the first and second disconnecting switch units comprises a mechanical switch installed on the line so as to open and close the line and a diode connected in parallel to the mechanical switch, and the two diodes are installed in opposite directions to each other.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: June 2, 2020
    Assignees: HYOSUNG HEAVY INDUSTRIES CORPORATION
    Inventors: Hee Jin Kim, Kyeon Hur, Dong Su Lee, Jae Sik Kang, Ju Yong Jung, Sang Min Kim, Jong Seo Na
  • Publication number: 20200163261
    Abstract: Provided is a method for manufacturing an electromagnetic interference shielding film comprising an electromagnetic interference shielding layer, the method comprising the steps of: preparing a metal nanoplate solution comprising a solvent in which metal nanoplates are dispersed; and coating the metal nanoplate solution on a substrate.
    Type: Application
    Filed: December 24, 2018
    Publication date: May 21, 2020
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Ho-Koang CHOI, Byung Joon MOON, Dong Su LEE, Sukang BAE, Seoung-Ki LEE, Sang Hyun LEE, Tae-Wook KIM
  • Patent number: 10652591
    Abstract: The present invention relates to a system for a cloud streaming service, a method for same using a still-image compression technique and an apparatus therefor, particularly the method allowing a still image-based cloud streaming service by comparing the previous frame and current frame to determine and capture the region in the current frame which has changed from the previous frame, and transmitting, to a user, the changed region encoded with the still-image compression technique. By utilizing a still-image compression technique appropriate to the image type when providing the cloud streaming service, the compression efficiency of the still image and the speed of the cloud streaming service can be improved.
    Type: Grant
    Filed: January 30, 2017
    Date of Patent: May 12, 2020
    Assignee: SK PLANET CO., LTD.
    Inventors: Tae-Meon Bae, Hong-Seo Yun, Hyun-Sik Na, Dong-Gook Kim, Yoo-Ri Jung, Dong-Su Lee
  • Patent number: 10601891
    Abstract: A cloud streaming service system, a cloud streaming service method using an optimal GPU, and an apparatus for the same are disclosed. A cloud streaming service can be provided by determining whether a video is played on a browser, when a playback of the video is sensed, decoding the video by using a video decoding entity determined on the basis of system resource conditions, and performing a streaming procedure corresponding to capturing, encoding and sending the decoded video. When a video is provided through the cloud streaming service, it is possible to effectively use the resources of a cloud streaming system by efficiently distributing a plurality of GPUs equipped in the cloud streaming system.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: March 24, 2020
    Assignee: SK PLANET CO., LTD.
    Inventors: Dong-Su Lee, Hong-Seo Yun