Patents by Inventor Dalsu CHOI

Dalsu 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).

  • Device and Method for progressive top-k subarray query processing in array databases
    Patent number: 11657055
    Abstract: A method of processing top-k (k is a natural number) query in array data is described. The method of processing the top-k query is performed in a computing device including at least a processor, and includes dividing an array including a plurality of cells into a plurality of partitions, and finding an ith answer in the array.
    Type: Grant
    Filed: January 8, 2021
    Date of Patent: May 23, 2023
    Assignee: Korea University Research and Business Foundation
    Inventors: Yon Dohn Chung, Dalsu Choi
  • Method for preparing carbon material using polyolefin-based plastic and carbon material prepared therefrom
    Patent number: 11427471
    Abstract: Provided are a method for preparing a carbon material using a polyolefin-based plastic, which includes a step of dissolving a polyolefin-based plastic in a solvent and then precipitating to obtain a polyolefin-based polymer having, for example, a powder or film shape, a step of crosslinking and cyclizing the precipitated polyolefin-based polymer to stabilize the polyolefin-based polymer and to cleave linear bonding of the polyolefin-based polymer, and a step of carbonizing the stabilized polyolefin-based polymer and a carbon material prepared according to this method. According to this method, it is possible to convert polyolefin-based plastics, particularly polyolefin-based waste plastics, into high-quality carbon materials having high heat-generating properties and a high electrical conductivity by a simple and efficient process.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: August 30, 2022
    Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Dalsu Choi, Dawon Jang, Sung Ho Lee
  • DEVICE AND METHOD FOR PROGRESSIVE TOP-K SUBARRAY QUERY PROCESSING IN ARRAY DATABASES
    Publication number: 20210209111
    Abstract: Disclosed is a method of processing top-k (k is a natural number) query in array data. The method of processing the top-k query is performed in a computing device including at least a processor, and includes dividing an array including a plurality of cells into a plurality of partitions and finding an ith answer in the array.
    Type: Application
    Filed: January 8, 2021
    Publication date: July 8, 2021
    Applicant: Korea University Research and Business Foundation
    Inventors: Yon Dohn CHUNG, Dalsu CHOI
  • METHOD FOR PREPARING CARBON MATERIAL USING POLYOLEFIN-BASED PLASTIC AND CARBON MATERIAL PREPARED THEREFROM
    Publication number: 20190144279
    Abstract: Provided are a method for preparing a carbon material using a polyolefin-based plastic, which includes a step of dissolving a polyolefin-based plastic in a solvent and then precipitating to obtain a polyolefin-based polymer having, for example, a powder or film shape, a step of crosslinking and cyclizing the precipitated polyolefin-based polymer to stabilize the polyolefin-based polymer and to cleave linear bonding of the polyolefin-based polymer, and a step of carbonizing the stabilized polyolefin-based polymer and a carbon material prepared according to this method. According to this method, it is possible to convert polyolefin-based plastics, particularly polyolefin-based waste plastics, into high-quality carbon materials having high heat-generating properties and a high electrical conductivity by a simple and efficient process.
    Type: Application
    Filed: November 13, 2018
    Publication date: May 16, 2019
    Inventors: Dalsu CHOI, Dawon JANG, Sung Ho LEE