Patents by Inventor Nam-Kyoo Park
Nam-Kyoo Park 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: 11961223Abstract: An apparatus for predicting performance of a wheel in a vehicle: includes a learning device that generates a latent space for a plurality of two-dimensional (2D) wheel images based on a convolutional autoencoder (CAE), extracts a predetermined number of the plurality of 2D wheel images from the latent space, and learns a dataset having the plurality of 2D wheel images and performance values corresponding to the plurality of 2D wheel images; and a controller that predicts performance for the plurality of 2D wheel images based on a performance prediction model obtained by the learning device.Type: GrantFiled: April 20, 2021Date of Patent: April 16, 2024Assignees: HYUNDAI MOTOR COMPANY, KIA CORPORATION, SOOKMYUNG WOMEN'S UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATIONInventors: Jong Ho Park, Chang Gon Kim, Chul Woo Jung, Sang Min Lee, Min Kyoo Kang, Ji Un Lee, Kwang Hyeon Hwang, Nam Woo Kang, So Young Yoo, Seong Sin Kim, Sung Hee Lee
-
Patent number: 10043508Abstract: A meta atom for controlling acoustic parameters and metamaterials comprising the same, which includes a first resonator assembly having a pair of resonators configured of two resonators disposed apart from each other with respect to an axis direction; a second resonator assembly positioned inside the pair of resonators included in the first resonator assembly, and having at least one resonator; and partitions connected between the first resonator assembly and the second resonator assembly, and supporting the first and second resonator assembly.Type: GrantFiled: November 30, 2016Date of Patent: August 7, 2018Assignee: Seoul National University R&DB FoundationInventors: Nam Kyoo Park, Suk Mo Koo, Choon Lae Cho
-
Publication number: 20170316772Abstract: A meta atom for controlling acoustic parameters and metamaterials comprising the same, which includes a first resonator assembly having a pair of resonators configured of two resonators disposed apart from each other with respect to an axis direction; a second resonator assembly positioned inside the pair of resonators included in the first resonator assembly, and having at least one resonator; and partitions connected between the first resonator assembly and the second resonator assembly, and supporting the first and second resonator assembly.Type: ApplicationFiled: November 30, 2016Publication date: November 2, 2017Applicant: Seoul National Universtity R&DB FoundationInventors: Nam Kyoo Park, Suk Mo Koo, Choon Lae Cho
-
Patent number: 7684662Abstract: An AD converter is provided. The AD converter includes a light source unit which provides an optical signal, at least one waveguide unit which consists of a photonic crystal and transmits the optical signal, a modulation unit which applies a RF signal to the at least one waveguide unit, thereby modulating an optical signal output from the at least one waveguide unit, and a digital conversion unit which converts the modulated optical signal to a digital signal. Accordingly, a compact-sized AD convert can be realized.Type: GrantFiled: August 21, 2008Date of Patent: March 23, 2010Assignees: Samsung Electronics Co., Ltd., Seoul National University Industry FoundationInventors: Young-Tack Houng, Nam-Kyoo Park, Sang-Wook Kwon, In-Sang Song, Jong-Seok Kim, Suk-Mo Koo, Sun-Kyu Yu
-
Publication number: 20090142014Abstract: An AD converter is provided. The AD converter includes a light source unit which provides an optical signal, at least one waveguide unit which consists of a photonic crystal and transmits the optical signal, a modulation unit which applies a RF signal to the at least one waveguide unit, thereby modulating an optical signal output from the at least one waveguide unit, and a digital conversion unit which converts the modulated optical signal to a digital signal. Accordingly, a compact-sized AD convert can be realized.Type: ApplicationFiled: August 21, 2008Publication date: June 4, 2009Applicants: SAMSUNG ELECTRONICS CO., LTD., SEOUL NATIONAL UNIVERSITY INDUSTRY FOUNDATIONInventors: Young-tack HOUNG, Nam-kyoo Park, Sang-wook Kwon, In-sang Song, Jong-seok Kim, Suk-mo Koo, Sun-kyu Yu
-
Patent number: 7206124Abstract: Disclosed is a gain-providing optical power equalizer which can equalize optical channel output or gain while amplifying signal output. In prior art technologies, optical power equalization has been achieved by attenuating signal output differently depending upon optical channels. However, the optical power equalizer of the present invention is characterized in that it achieves equalization of optical power by giving optical gain differently depending upon optical channels. According to the present invention, the output of optical channels can be adjusted to be flat or as desired without deteriorating signal to noise ratio.Type: GrantFiled: March 20, 2003Date of Patent: April 17, 2007Assignee: Luxpert Technologies Co., Ltd.Inventors: Nam-Kyoo Park, Jung-Hoon Shin
-
Patent number: 7075708Abstract: The present invention relates to a waveguide amplifier which is comprised of silica or silica-related material co-doped with silicon nanoclusters and rare earth elements, and more particularly, to a waveguide amplifier with higher efficiency enhanced by top-pumping method and focusing means for pumping light. The waveguide amplifier of the present invention comprises of: (a) a substrate; (b) an optical waveguide including: a lower cladding layer formed on the substrate; a core layer which is made of silica or silica-related material co-doped with silicon nanoclusters and rare earth elements on the lower cladding layer and has a refractive index higher than that of the lower cladding; and an upper cladding layer formed on the core layer; and (c) a light source, spaced apart from the waveguide, for optically pumping the waveguide, wherein the waveguide amplifier operates by exciting the rare earth elements through electron-hole combinations in the silicon nanoclusters.Type: GrantFiled: January 29, 2003Date of Patent: July 11, 2006Assignee: Luxpert Technologies Co., Ltd.Inventors: Jung-Hoon Shin, Hak-Seung Han, Nam-Kyoo Park
-
Publication number: 20050152427Abstract: The present invention relates to an array-type optical device, which can enhance optical pumping efficiency. The major characteristic of the present invention is that the array-type optical device has as many gain medium structures as possible within a beam spot of an optical pumping source or has an increased number of optical pumping sources to irradiate gain medium structures, which enhances optical pumping efficiency.Type: ApplicationFiled: March 13, 2003Publication date: July 14, 2005Inventors: Jung-Hoon Shin, Nam-Kyoo Park
-
Publication number: 20050128569Abstract: Disclosed is a gain-providing optical power equalizer which can equalize optical channel output or gain while amplifying signal output. In prior art technologies, optical power equalization has been achieved by attenuating signal output differently depending upon optical channels. However, the optical power equalizer of the present invention is characterized in that it achieves equalization of optical power by giving optical gain differently depending upon optical channels. According to the present invention, the output of optical channels can be adjusted to be flat or as desired without deteriorating signal to noise ratio.Type: ApplicationFiled: March 20, 2003Publication date: June 16, 2005Inventors: Nam-Kyoo Park, Jung-Hoon Shin
-
Publication number: 20050128570Abstract: Disclosed is an optical device with enhanced pumping efficiency where light from a pumping light source is efficiently absorbed in a gain medium structure placed under the pumping light. The major characteristic of the optical device of the present invention is that it is top-pumped and a portion in the gain medium structure, which is included in a beam spot of the light source, has a larger area than other portions in the gain medium structure. According to the present invention, a top-pumped optical device with higher pumping efficiency can be provided.Type: ApplicationFiled: March 11, 2003Publication date: June 16, 2005Inventors: Jung-Hoon Shin, Nam-Kyoo Park
-
Publication number: 20050122569Abstract: The present invention relates to a input light signal waveguide amplifier which is comprised of silica or silica-related material co-doped with silicon nanoclusters and rare earth elements, and more particularly, to a pumping light h 100 waveguide amplifier with higher efficiency enhanced by top-pumping method and focusing means for pumping light. The waveguide amplifier of the present invention comprises of: (a) a substrate; (b) an optical waveguide including: a lower cladding layer formed on the substrate; a core layer which is made of silica or silica-related material co-doped with silicon nanoclusters and rare earth elements on the lower cladding layer and has a refractive index higher than that of the lower cladding; and an upper cladding layer formed on the core layer; and (c) a light source, spaced apart from the waveguide, for optically pumping the waveguide, wherein the waveguide amplifier operates by exciting the rare earth elements through electron-hole combinations in the silicon nanoclusters.Type: ApplicationFiled: January 29, 2003Publication date: June 9, 2005Inventors: Jung-Hoon Shin, Hak-Seung Han, Nam-Kyoo Park
-
Patent number: 6473549Abstract: A multi-stage optical amplifier for use in the transmission of optical signals over fiber when using Wavelength Division Multiplexing. Wavelength Division Multiplexing is particularly sensitive to differences in gain between channels and these differences become critical when cascaded fiber amplifiers are used to boost the signal over long distances. The present amplifier flattens the differences in gain and reduces noise figure by using multi-stage equalizing filters along the length of the transmission fiber.Type: GrantFiled: June 13, 2000Date of Patent: October 29, 2002Assignee: Samsung Electronics, Co., Ltd.Inventors: Nam-Kyoo Park, Ju-Han Lee
-
Patent number: 6330384Abstract: A high-power and wide-band fiber optic light source including a first rare-earth-doped optical fiber, a second rare-earth-doped optical fiber, an optical coupler coupled between the first and second rare-earth-doped optical fiber for transmitting the input pumping light to the second rare-earth-doped optical fiber, and a pumping light source adapted to supply pumping light, as the input pumping light, to the optical coupler.Type: GrantFiled: September 15, 1999Date of Patent: December 11, 2001Assignee: Samsung Electronics Co., Ltd.Inventors: Uh-Chan Ryu, Nam-Kyoo Park, Ju-Han Lee
-
Patent number: 6317254Abstract: A parallel optical fiber amplifier having a configuration in which a C-band silica-based erbium-doped fiber amplifier (EDFA) stage and an L-band EDFA stage are coupled together in parallel in such a fashion that a reverse amplified spontaneous emission (ASE) light emitted from the C-band and/or L-band EDFA stage is reused as a secondary pumping source for an amplification in the L-band EDFA stage. In the optical fiber amplifier of the present invention, the reverse ASE light emitted from the C-band EDFA stage and the reverse ASE light emitted from the L-band EDFA stages supplied to the L-band EDFA stage so that they can be reused for improving the power conversion efficiency of the entire system and for reducing the noise factor thereof.Type: GrantFiled: November 24, 1999Date of Patent: November 13, 2001Assignee: Samsung Electronics Co., Ltd.Inventors: Nam-Kyoo Park, Ju-Han Lee, Uh-Chan Ryu
-
Patent number: 6222670Abstract: A long-band optical fiber amplifier with enhanced power conversion efficiency including a first optical fiber part provided with a pumping light source, a second optical fiber part connected with the first optical fiber part, the second optical fiber part being not provided with the pumping light source, and a reuse circuit coupled between the first optical fiber part and the second optical fiber part for utilizing amplified spontaneous emission (ASE) as a secondary pumping light source from the first optical fiber part. Preferably, the reuse circuit comprises a WDM coupler connected between the first and second optical fiber parts, and a light pumping device connected with the WDM coupler to provide the pumping light source. The first and second optical fiber parts consist of erbium-doped optical fiber, and the erbium-doped optical fiber is adjusted so as to produce a gain in the L-band.Type: GrantFiled: August 25, 1999Date of Patent: April 24, 2001Assignee: Samsung Electronics Co., Ltd.Inventors: Uh-Chan Ryu, Nam-Kyoo Park, Ju-Han Lee