Patents by Inventor Nak Choi

Nak 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).

  • Patent number: 11915449
    Abstract: The present invention relates to a method and an apparatus for estimating a user pose using a three-dimensional virtual space model. The method of estimating a user pose including the position and orientation information of a user for a three-dimensional space includes a step of receiving user information including an image acquired in a three-dimensional space, a step of confirming a three-dimensional virtual space model constructed based on spatial information including depth information and image information for the three-dimensional space, a step of generating corresponding information corresponding to the user information in the three-dimensional virtual space model, a step of calculating similarity between the corresponding information and the user information, and a step of estimating a user pose based on the similarity.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: February 27, 2024
    Assignee: Korea University Research and Business Foundation
    Inventors: Nak Ju Doh, Ga Hyeon Lim, Jang Hun Hyeon, Dong Woo Kim, Bum Chul Jang, Hyung A Choi
  • Patent number: 9149746
    Abstract: The present invention relates to a porous media-mediated high speed filtration device for easy backwash, wherein the inflow water to be filtered is guided to an upper portion of the high speed filtration device and is filtered by downflow and porous media are backwashed for maintaining optimum filter efficiency by blocking the flow of inflow water and water to be treated after sensing the level of the inflow water or the change in the flux of the water to be treated, supplying backwash water and/or air by upflow through a backwash equipment to separate pollutants in the porous media by the collision and friction between the porous media by flowing of the porous media through the stream of the backwash water, placing the porous media in a stationary location, and discharging the pollutants through a discharge pipe of the high speed filtration device before the pollutants settle. In addition, the present invention comprises a backwash method of the high speed filtration device using porous media.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: October 6, 2015
    Inventor: Jin Nak Choi
  • Publication number: 20120211430
    Abstract: The present invention relates to a porous media-mediated high speed filtration device for easy backwash, wherein the inflow water to be filtered is guided to an upper portion of the high speed filtration device and is filtered by downflow and porous media are backwashed for maintaining optimum filter efficiency by blocking the flow of inflow water and water to be treated after sensing the level of the inflow water or the change in the flux of the water to be treated, supplying backwash water and/or air by upflow through a backwash equipment to separate pollutants in the porous media by the collision and friction between the porous media by flowing of the porous media through the stream of the backwash water, placing the porous media in a stationary location, and discharging the pollutants through a discharge pipe of the high speed filtration device before the pollutants settle. In addition, the present invention comprises a backwash method of the high speed filtration device using porous media.
    Type: Application
    Filed: October 25, 2010
    Publication date: August 23, 2012
    Inventor: Jin Nak Choi
  • Publication number: 20090228294
    Abstract: Self-asserted socio-demographic attributes of individuals' identities are verified using social network analysis and other means. Through these processes, parties to a transaction or interaction arc provided a measure of confidence about another party's self-asserted socio-demographic attributes, such as age, gender, marital status, etc., in order to assist in determining whether or not to pursue the transaction or interaction. The measure of confidence may be provided as a quantitative “score” indicative of the likelihood the user's self-asserted attribute is actually true. The quantitative score is derived by analyzing a web of trust in which the user is embedded.
    Type: Application
    Filed: October 30, 2008
    Publication date: September 10, 2009
    Applicant: ASSERTID INC.
    Inventors: Joon Nak Choi, Kevin Trilli
  • Publication number: 20070195472
    Abstract: An electrostatic discharge protection circuit protects the internal circuits of a semiconductor. The electrostatic discharge protection circuit includes a first electrostatic protection unit connected to a power source supply pad. The first electrostatic protection unit discharges an ESD current into the power source supply pad when an ESD is introduced into the input/output pad, and generates a first driving voltage by utilizing the ESD current flow through a voltage-drop unit. A driver driven by the first driving voltage generates a second driving voltage by an ESD current. A second electrostatic protection unit discharges the introduced ESD current into the power source supply pad by the second driving voltage such that a voltage applied to a gate of the first NMOS transistor is reduced.
    Type: Application
    Filed: December 29, 2006
    Publication date: August 23, 2007
    Inventors: Kook Kwak, Nak Choi
  • Publication number: 20070176629
    Abstract: Provide is a molecular electronic device which includes a first electrode, a molecular active layer self-assembled on the first electrode using a thiol-based anchoring group or a silane-based anchoring group, and a second electrode including an organic electrode layer covering the molecular active layer. The organic electrode layer includes a highly conductive monomer, an oligomer or a polymer. The molecular active layer composes a switching element which is mutually switchable to states of ON and OFF according to voltages applied between the first electrode and the second electrode, and a memory element in which a predetermined electric signal is stored according to voltages applied between the first electrode and the second electrode.
    Type: Application
    Filed: October 31, 2006
    Publication date: August 2, 2007
    Inventors: Hyoyoung Lee, Nak Choi, Jung Lee, Jong Park, Gyeong Bang, Hee Baek
  • Publication number: 20070128549
    Abstract: Provided is a method of fabricating a nanoimprint mold which can form sub-100 nm fine pattern structures. The method includes forming patterns on a first substrate using an E-beam lithography (EBL) process, and transferring the patterns formed on the first substrate to a second substrate using a nanoimprint lithography (NIL) process to complete an NIL mold. Accordingly, the method can easily fabricate the nanoimprint mold at low costs on a quartz or glass substrate, which is not suitable for an EBL process to produce sub-100 nm patterns, by utilizing the advantages of the EBL process with a resolution of tens of nanometers.
    Type: Application
    Filed: August 17, 2006
    Publication date: June 7, 2007
    Inventors: Jong Park, Hyo Lee, Nak Choi, Jung Lee, Gyeong Bang
  • Publication number: 20070120121
    Abstract: Provided are a compound for a molecular electronic device which includes a terpyridine-ruthenium organic metal compound including a thiol anchoring group of the formula below, a method of synthesizing the compound and a molecular electronic device including a molecular active layer obtained from the compound. In the formula, R1 and R2 are each a thioacetyl group or a hydrogen atom, at least one of R1 and R2 is a thioacetyl group, and m and n are each integers from 0 to 20. The molecular active layer, which is formed by self-assembling the compound on an electrode surface, composes a switching element and a memory element.
    Type: Application
    Filed: November 22, 2006
    Publication date: May 31, 2007
    Inventors: Hyo Lee, Jung Lee, Gyeong Bang, Nak Choi, Jong Park
  • Publication number: 20060215344
    Abstract: Disclosed is an electrostatic protection device for a semiconductor device. The electrostatic protection device includes a transfer unit for transferring static electricity introduced through an input/output port to an external voltage line and outputting a first voltage caused by the static electricity, a driver connected between the first voltage and a grounding voltage line, and a discharge unit connected between the external voltage line and the grounding voltage line so as to be driven based on the output of the driver, wherein the driver is turned on by the static electricity transferred to the external voltage line.
    Type: Application
    Filed: March 13, 2006
    Publication date: September 28, 2006
    Inventor: Nak Choi
  • Publication number: 20060083661
    Abstract: The invention relates to a new micro power cell applying the microfluidic-chip with multi-channel type. The streaming potential is the main thrust, which is created by Helmholtz-Smoluchowski's electrokinetic principle when electrolytic solution flows through a microchannel. The microfluidic-chip comprises an inflow port, a distributor, a multi-channel, a collector, an outflow port, and a pair of electrodes. The present invention could be applied to a new power source of clean energy.
    Type: Application
    Filed: October 19, 2004
    Publication date: April 20, 2006
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Myung-Suk Chun, Nak Choi
  • Publication number: 20050163855
    Abstract: Provided is a method of preparing low-crystallinity oltipraz or amorphous oltipraz. The method includes: obtaining a mixed solution containing oltipraz and a water-soluble polymer or a water-insoluble polymer in a solvent, the solvent being an organic solvent or purified water; and solid-dispersing the oltipraz in the polymer. In the solid-dispersing, the mixed solution may be spray dried using a spray dryer or granulated using a fluid bed granulator.
    Type: Application
    Filed: January 27, 2005
    Publication date: July 28, 2005
    Applicant: CJ CORPORATION
    Inventors: Cheong Cho, Kyoung Kang, Sang Lee, Jeong Ku, Taekrho Kim, Sung Lee, Jae Choi, Jun Cheon, Tae An, Hyun Park, Eun Jeon, Kwang Choi, Jee Lim, Kwang Hong, Hyesuk Hong, Il Kim, Tae Kim, Nak Choi, Young Kim, Kyu Yeon, Hearan Suh, Hae Jin, Jinwan Kim, In Min