Hyun Seo Kang
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Hyun Seo Kang has a total of 17 co-authors. Here are the top co-authors by number of shared publications:
- Chan Il Yeo
Honam Research Center, Electronics and Telecommunications of Research Institute, 176-11 Cheomdan, Gwagi-ro, Buk-gu, Gwangju 61012, Korea
2 shared publications - Siwoong Park
Electronics and Telecommunications Research Institute, Daejeon, South Korea
2 shared publications - Young Soon Heo
Honam Research Center, Electronics and Telecommunications of Research Institute, 176-11 Cheomdan, Gwagi-ro, Buk-gu, Gwangju 61012, Korea
2 shared publications - Dong-Seon Lee
Department of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology (GIST), 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
1 shared publication - Hyoung-Jun Park
Electronics and Telecommunications Research Institute, Daejeon, South Korea
1 shared publication Hyung-Suk Ryu
Electronics and Telecommunications Research Institute, Optical Communications Components Research Center, 1 Oryong-dong, Buk-gu, Gwangju, 500-712, Korea
1 shared publication
Latest Publications
- 8 February 2025
- Published by Springer Nature
- p. 17-28
Dinov2_Mask R-CNN: Self-supervised Instance Segmentation of Diabetic Foot Ulcers
- 8 February 2025
- Published by Springer Nature
- p. 17-28
Dinov2_Mask R-CNN: Self-supervised Instance Segmentation of Diabetic Foot Ulcers
- Open Access
Tracking Efficiency Improvement According to Incident Beam Size in QPD-Based PAT System for Common Path-Based Full-Duplex FSO Terminals
Free space optical (FSO) communication can support various unmanned aerial vehicles’ (UAVs) applications that require large capacity data transmission. In order to perform FSO communication between two terminals, it is essential to employ a pointing, acquisition, and tracking (PAT) system with an efficient and optimal performance. We report on the development of a common optical-path-based FSO communication system, tailored for applications in UAVs. The proposed system is equipped with a quadrant photodiode (QPD)-based PAT system without an additional beacon beam subsystem. The presented approach reduced the structural complexity and improved the tracking efficiency for the same size, weight, and power (SWaP). To achieve a robust FSO link in a dynamic UAV environment, the observability and controllability were obtained based on the linearized control according to the incident beam size on the QPD, which was verified by optical simulation and experiments. As a result, the QPD-based PAT system for implementing FSO links demonstrated an up to 4.25 times faster tracking performance. Moreover, the FSO link experimentally confirmed the 1.25 Gbps full-duplex error-free communication at a 50 m distance.
Open AccessTracking Efficiency Improvement According to Incident Beam Size in QPD-Based PAT System for Common Path-Based Full-Duplex FSO Terminals
Free space optical (FSO) communication can support various unmanned aerial vehicles’ (UAVs) applications that require large capacity data transmission. In order to perform FSO communication between two terminals, it is essential to employ a pointing, acquisition, and tracking (PAT) system with an efficient and optimal performance. We report on the development of a common optical-path-based FSO communication system, tailored for applications in UAVs. The proposed system is equipped with a quadrant photodiode (QPD)-based PAT system without an additional beacon beam subsystem. The presented approach reduced the structural complexity and improved the tracking efficiency for the same size, weight, and power (SWaP). To achieve a robust FSO link in a dynamic UAV environment, the observability and controllability were obtained based on the linearized control according to the incident beam size on the QPD, which was verified by optical simulation and experiments. As a result, the QPD-based PAT system for implementing FSO links demonstrated an up to 4.25 times faster tracking performance. Moreover, the FSO link experimentally confirmed the 1.25 Gbps full-duplex error-free communication at a 50 m distance.
- Open Access
A Sensing Device with the Optical Temperature Sensors-Based Quad-RX Module and a Security Module
In this paper, we present a sensing device with the optical temperature sensors-based quad receiver (Quad-RX) module and a security module. In addition, in order to prevent cyberattacks on critical national infrastructures and key facilities, we implemented symmetric-key and secure hash algorithm-based hardware security modules in the key elements of the sensing device. A preliminary test was conducted prior to a field trial to verify the performance of the developed sensing device. The accuracy and stability of the sensing device were then verified for 1 month in a field test at facilities for energy storage systems and photovoltaic converters in sewage treatment plants.
Open AccessA Sensing Device with the Optical Temperature Sensors-Based Quad-RX Module and a Security Module
In this paper, we present a sensing device with the optical temperature sensors-based quad receiver (Quad-RX) module and a security module. In addition, in order to prevent cyberattacks on critical national infrastructures and key facilities, we implemented symmetric-key and secure hash algorithm-based hardware security modules in the key elements of the sensing device. A preliminary test was conducted prior to a field trial to verify the performance of the developed sensing device. The accuracy and stability of the sensing device were then verified for 1 month in a field test at facilities for energy storage systems and photovoltaic converters in sewage treatment plants.
- 1 August 2007
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-2
Design of Mixed Signal Power Divider for Fiber Optic Applications
A simple monolithic power divider for digital/RF mixed signal is designed for fiber-optic applications. The insertion and return loss between input port and RF output port are 0.2 dB and 31dB at the center frequency. Almost 30 dB of isolations between digital port and RF port are achieved each other.
- 1 August 2007
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-2
Design of Mixed Signal Power Divider for Fiber Optic Applications
A simple monolithic power divider for digital/RF mixed signal is designed for fiber-optic applications. The insertion and return loss between input port and RF output port are 0.2 dB and 31dB at the center frequency. Almost 30 dB of isolations between digital port and RF port are achieved each other.
- 1 October 2004
- Published by SPIE-Intl Soc Optical Eng in Optical Engineering
- Vol. 43 (10) , 2212-2213
Analysis of wavelength effects on a spherical-end fiber lens
The wavelength of light affects the working distance to the beam waist and the mode field diameter in a spherical-end fiber lens. The compensation effects of the chromatic aberration in the fiber lens are shown, and the predicted results are found to be in good agreement with the experimental values. © 2004 Society of Photo-Optical Instrumentation Engineers.
- 1 October 2004
- Published by SPIE-Intl Soc Optical Eng in Optical Engineering
- Vol. 43 (10) , 2212-2213
Analysis of wavelength effects on a spherical-end fiber lens
The wavelength of light affects the working distance to the beam waist and the mode field diameter in a spherical-end fiber lens. The compensation effects of the chromatic aberration in the fiber lens are shown, and the predicted results are found to be in good agreement with the experimental values. © 2004 Society of Photo-Optical Instrumentation Engineers.