소개
Prof. Young-Chai Ko
Associate Dean (Planning) & Professor
College of Engineering,
School of Electrical Engineering
Tel: 02-3290-3254
E-mail: koyc@korea.ac.kr
- About Professor
- Publication
- Research
- Teaching
- Lab Members
Profile
Prof. Ko obtained his BS degree in Electronic-Communications from Hanyang University, Seoul, Korea in 1997 and MSEE and Ph.D in Electrical Engineering from University of Minnesota, twin cities, MN in 1999 and 2001, respectively. He had worked for Texas Instruments Inc., San Diego, CA from 2001 to 2004. He joined Korea University as Assistant Professor in 2004 and became a full Professor in 2011.
He leads the communication system lab with the research focus on the performance analysis, modeling and design of wireless systems. The on-going funded research projects include the future Wi-Fi system design, the mm-wave bvased long distance communication systems, the waveform design for 5G and B5G, and the free-space optical communications.
He teaches the communication theory, digital communications, wireless communications, estimation and detection, machine learning , probability and random process. He received the Suk-Top teaching award 11 times since he joined Korea University in 2004. He is an adjunct Professor in Samsung System LSI University and has taught communication systems and the wireless communications since March in 2017. He also offered the short course to Samsung Electronics in Summer of 2018. Most of his lectrures are open and can be found in Youtube.
Dr. Ko is senior member of IEEE and life member of KICS.
Publication
Selected Journal
1. S. Nam, M. -S. Alouini, and Y. -C. Ko, "Performance Analysis of a Threshold-Based Parallel Multiple Beam Selection Scheme for WDM FSO Systems", IEEE Access, Vol. 6, pp. 21498-21517, June, 20182. B. Lim and Y. -C. Ko, "SIR Analysis of OFDM and GFDM Waveforms With Timing Offset, CFO, and Phase Noise", IEEE Trans. on Wireless Commun., Vol. 10, No. 16, pp. 6979-6990, Oct. 20173. S. Nam, M. -S. Alouini, and Y. -C. Ko, "Threshold-Based Multiple Optical Signal Selection Scheme for Free-Space Optical Wavelength Division Multiplexing Systems", Journal of Optical Coimmunications and Networking, Vol. 12, No. 9, pp. 1085-1096, Dec. 2017Research
Research Topic
Our current main research topics include 1) the statistical channel modeling of mm-wave, tera hertz, and free-space optical communications, 2) long-range communications using hybrid RF and free-space optical systems, 3) beamforming techniques for mm-wave and tera hertz communications, 4) waveform design for 5G and B5G cellular systems, and 5) localization techniques using ambient RF signals, all of which are funded by various agencies and institutes in Korea.
Teaching
- Communication systems 1 (Undergraduate course for the third year students)
- In this class, I teach 1) signal and system, 2) analog modulations/demodulations, 3) probability and random process, and 4) Nyquist sampling theorem and pulse modulation.
- The prerequisite is probability and random process.
- You can find the video lecture of the 1st semester in 2018 by clicking each subject as below:
Communications system II (Undergraduate course for the 3rd year)
- In this class, I teach 1) digital modulations, 2) optimal receiver over AWGN, 3) bit error rate and symbol error rate calculation, and 4) communications over band-limited channels.
- The prerequisite courses are 1) signals and system and 2) probability and random process.
- You can find the video lecture in YouTube by clicking the subject below (recorded in 2013):
- Review of probability theory (120829)
- Review of probability theory and random variable (120903)
- Basic random variables (120905)
- Transformation of random variable and multiple random variable (120910)
- Random process (120912)
- Autocorrelation and power spectral density (120917)
- Binary pulse modulation (120919)
- AWGN and demodulation techniques (120924)
- Demodulatoin techniques and detection of signal (120926)
- Performance of binary PAM optimum receiver (121008)
- Performance of binary orthogonal signal’s receiver (121010)
- Performacne of M-ary PAM and M-ary orthgonal modulation (121017)
- Decision criterion rule (121024)
- BER, SER and gray coding121029)
- Union bound on the probabilty error and syncronization (121031)
- Band limited channel (121105)
- ISI and Nyquist condition (121112)
- Equivalent lowpass representation (121114)
- Phase-shift keying(121119)
- Performance of PSK (121121)
- Quadrature Ampllitude Modulation (121123)
- Performance of M-QAM (121126)
- Frequency shift keying (121128)
Mobile Communications Engineering (Undergraduate course for the 4th year)
- In this class, I teach 1) cellular concept, 2) wireless channel modeling, 3) performance of digital communications over wireless channels, 4) multiple antenna systems, and 4) multiple access systems.
- The prerequisite courses are 1) communication systems II, 2) signal and systems, and 3) probability and random process.
- You can find the video lecture in YouTube by clicking the subject below (recorded in 2015):
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Lab Members
Current Students
1. 조 성경
- Started in 2014 for Samsung IT students for joint MS/Ph. D program
- BS in Korea University
2. 이지호
- Started in 2014 for joint MS/Ph.D. program
- BS in Korea University
3. 권재홍
- Started in 2014 for joint MS/Ph.D. program
- BS in Korea University
4. 임병주- Started in 2015 for joint MS/Ph.D. program- BS in Korea University
5. 김재원- Started in 2016 for joint Ph.D. program
- BS in Yonsei University
6. 이영록- Started in 2016 for joint MS/Ph.D. program
- BS in Korea University
7. 이주형- Started in 2016 for joint MS/Ph.D. program
- BS in Korea University
8. 정국진- Started in 2016 for joint MS/Ph.D. program
- BS in Korea University
9. 나동현- Started in 2017 for joint MS/Ph.D. program
- BS in Korea University
10. 송하림- Started in 2017 for joint MS/Ph.D. program
- BS in Korea University
11. 윤석현- Started in 2017 for joint MS/Ph.D. program
- BS in Korea University
Research ProfessorSungsik Nam, Ph. D.- Ph. D. from Texas A&M University- Joined in 2017 as BK21 research Professor