公开(公告)号：US11728897B2

公开(公告)日：2023-08-15

申请号：US17549779

申请日：2021-12-13

Applicant: Kookmin University Industry Academy Cooperation Foundation

Inventor： Yeong Min Jang ,  Ngoc Huy Nguyen

IPC: H04B10/50 ,  H04B10/556 ,  H04L27/12 ,  H04L27/10 ,  H04B10/116 ,  H04B10/11

CPC classification number: H04B10/5563 ,  H04B10/116 ,  H04B10/502 ,  H04L27/106 ,  H04L27/12 ,  H04B10/11 ,  H04B10/50 ,  H04B10/556

Abstract: An optical signal transmission method according to an embodiment of the disclosure is an optical signal transmission method in which a processor performs at least part of each operation, and may include an operation of receiving a data stream, an operation of separating at least part of the data stream into three channels, modulating the separated data streams respectively according to M-ary frequency shift keying (M-FSK) scheme so as to produce an FSK modulated signal, an operation of combining a plurality of FSK modulated signals modulated respectively in the three channels, and producing a color modulated signal according to a bit-color mapping table set in advance, and an operation of transmitting the color modulated signal by controlling a light source of the same optical channel based on the color modulated signal.

公开(公告)号：US11700461B2

公开(公告)日：2023-07-11

申请号：US17562712

申请日：2021-12-27

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Yeong Min Jang ,  Ahmed MD Faisal

IPC: H04N25/531 ,  H04B10/116

CPC classification number: H04N25/531 ,  H04B10/116

Abstract: An optical communication-based image processing system is disclosed. The system may include a transmitter having at least one light emitting element and a receiver having a rolling shutter camera. As the system is provided, a rolling shutter effect may be improved.

公开(公告)号：US20220166521A1

公开(公告)日：2022-05-26

申请号：US17361879

申请日：2021-06-29

Applicant: Kookmin University Industry Academy Cooperation Foundation

Inventor： Yeong Min Jang ,  Ngoc Huy Nguyen

IPC: H04B10/69 ,  H04B10/116 ,  H04L5/00

Abstract: A communication device effectively transmits high-speed data while being less affected by restrictions of an environment by adjusting a communication channel depending on an optical communication environment.

公开(公告)号：US10560193B2

公开(公告)日：2020-02-11

申请号：US16069844

申请日：2016-11-28

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Yeong Min Jang ,  Van Trang Nguyen ,  Chang Hyun Hong

IPC: H04B10/116 ,  H04B10/556 ,  H04B10/69

Abstract: A DSM-PSK optical wireless transmission method includes the steps of: receiving a binary data signal, allowing a modulator to convert the binary data signal into a global phase shift signal, generating a reference signal group including M number of pulse signals having the same period, the same duty ratio of d/M, mutually different phases, and a determined sequence, generating a data signal group including M number of pulse signals having a determined sequence, the pulse signals having been obtained by phase-shifting the reference signal group according to the global phase shift signal, flickering each light source of a reference light source group including M number of light sources having a determined sequence, according to each pulse signal of the reference signal group, and flickering each light source of a data light source group including M number of light sources having a determined sequence, according to each pulse signal of the data signal group.

公开(公告)号：US12026911B2

公开(公告)日：2024-07-02

申请号：US17564890

申请日：2021-12-29

Applicant: Kookmin University Industry Academy Cooperation Foundation

Inventor： Yeong Min Jang ,  Utama Ida Bagus Krishna Yoga ,  Ahmed Md. Faisal

IPC: G06T7/73

CPC classification number: G06T7/74 ,  G06T2207/20081 ,  G06T2207/20084

Abstract: This application relates to a battery test apparatus and an operating method thereof to check whether the direction of battery cells provided inside a battery tray is correct by implementing a computer vision AI algorithm. In one aspect, the method includes performing a first test for checking whether a battery tray has been correctly aligned with the battery test apparatus. The method may also include capturing a battery tray image including a plurality of battery cells using a camera upon alignment of the battery tray. The method may further include obtaining related information on battery cells from the battery tray image, and loading the related information on the battery cells. The method may further include performing a second test for checking whether directions of the battery cells are correct.

公开(公告)号：US20230336250A1

公开(公告)日：2023-10-19

申请号：US18339171

申请日：2023-06-21

Applicant: Kookmin University Industry Academy Cooperation Foundation

Inventor： Yeong Min Jang ,  Ngoc Huy Nguyen

IPC: H04B10/556 ,  H04B10/50 ,  H04L27/12 ,  H04L27/10 ,  H04B10/116

CPC classification number: H04B10/5563 ,  H04B10/502 ,  H04L27/12 ,  H04L27/106 ,  H04B10/116 ,  H04B10/50 ,  H04B10/11

Abstract: An optical signal transmission method according to an embodiment of the disclosure is an optical signal transmission method in which a processor performs at least part of each operation, and may include an operation of receiving a data stream, an operation of separating at least part of the data stream into three channels, modulating the separated data streams respectively according to M-ary frequency shift keying (M-FSK) scheme so as to produce an FSK modulated signal, an operation of combining a plurality of FSK modulated signals modulated respectively in the three channels, and producing a color modulated signal according to a bit-color mapping table set in advance, and an operation of transmitting the color modulated signal by controlling a light source of the same optical channel based on the color modulated signal.

公开(公告)号：US11496224B2

公开(公告)日：2022-11-08

申请号：US17361879

申请日：2021-06-29

Applicant: Kookmin University Industry Academy Cooperation Foundation

Inventor： Yeong Min Jang ,  Ngoc Huy Nguyen

IPC: H04B10/11 ,  H04B10/69 ,  H04L5/00 ,  H04B10/116 ,  H04B10/516

Abstract: A communication device effectively transmits high-speed data while being less affected by restrictions of an environment by adjusting a communication channel depending on an optical communication environment.

公开(公告)号：US11329727B1

公开(公告)日：2022-05-10

申请号：US17236241

申请日：2021-04-21

Applicant: Kookmin University Industry Academy Cooperation Foundation

Inventor： Yeong Min Jang ,  Ngoc Huy Nguyen

IPC: H04B10/116 ,  H04B10/516 ,  H04B10/69 ,  H04L27/10 ,  H04L27/26

Abstract: A device for transmitting a signal according to some embodiments of the present disclosure relates to a device for transmitting a signal using a hybrid waveform. The device may include a modulator configured to modulate an input signal and a signal transmitter configured to transmit the modulated final transmission signal through an LED light source, wherein the modulator is configured to modulate first information into a pulse signal based on frequency shift keying (FSK), and modulate second information into an orthogonal frequency division multiplexing (OFDM) signal, wherein the first information and the second information are different from each other and mix the pulse signal and the OFDM signal into one waveform to generate the final transmission signal.

公开(公告)号：US10742318B2

公开(公告)日：2020-08-11

申请号：US16069822

申请日：2016-11-28

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Yeong Min Jang ,  Van Trang Nguyen ,  Chang Hyun Hong

IPC: H04B10/116 ,  H04B10/556 ,  H04B10/67 ,  H04N7/22

Abstract: An optical wireless communication apparatus includes: a modulator for generating a reference signal including periodically repeating binary zeros and ones, receiving an input of a first binary data signal, and outputting a second binary data signal, wherein the second binary data signal has the same frequency as the reference signal, and has the same phase as the reference signal when the first binary data signal comprises binary zeros and has an opposite phase to the reference signal when the first binary data signal comprises binary ones, or has the same phase as the reference signal when the first binary data signal comprises binary ones and has an opposite phase to the reference signal when the first binary data signal comprises binary zeros, and a transmitter for turning a first light source on or off according to the reference signal, and turning a second light source on or off according to the second binary data signal.

公开(公告)号：US11979193B2

公开(公告)日：2024-05-07

申请号：US17625662

申请日：2019-11-28

Applicant: KOOKMIN UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION

Inventor： Yeong Min Jang ,  Van Thang Nguyen ,  Minh Duc Thieu ,  Ngoc Nguyen Huy ,  Tung Lam Pham

IPC: H04B10/556 ,  H04B10/67 ,  H04L1/00 ,  H04N7/22

CPC classification number: H04B10/5561 ,  H04B10/67 ,  H04L1/0047 ,  H04N7/22

Abstract: A method of modulating an optical camera communication (OCC) signal by an OCC transmission node in an OCC system includes acquiring a binary data signal, grouping the binary data signal for every k bits to convert the binary data signal into a global phase shift signal having an integer value from 0 to M−1 (=2k−1), generating a data signal group by mapping the global phase shift signal to first to Mth mapping sequences in the form of an n*M/2-bit sequence based on a preset symbol group mapping table, generating a pulse wave signal by modulating the data signal group, and blinking each of a plurality of light sources included in the OCC transmission node according to the pulse wave signal. Accordingly, performance of the communication system may be improved.