Publications

Book Chapters and Articles

1. Heejung Yu et al. "2019 5G Media Convergent Services," 5G Forum Korea, Mar. 2019. 

2. Heejung Yu et al. "2018 5G Convergent Service Scenarios," 5G Forum Korea, Apr. 2018.

3. Heejung Yu et al. "5G Service Roadmap 2022," 5G Forum Korea, Mar. 2016.

4. Heejung Yu (one of 4 co-authors), "Fundamentals of Mobile Communications (이동통신공학)" 4th edition, Life&Power Press(생능출판사), 2015.

5. Heejung Yu et al. "5G NEW WAVE," 5G Forum Korea, Mar. 2015.

International Journals

<Accepted or Early Access>

1. J. Bae, K. Waqas, A. Lee, H. Lee, S. Noh, Heejung Yu, "Overview of RIS-enabled Secure Transmission in 6G Wireless Networks," accepted for publication in Digital Communications and Networks, Dec. 2023.

2. W. Son, M. Oh, Heejung Yu, and B. C. Jung, "Physical-Layer Security in MU-MISO Downlink Networks against Potential Eavesdroppers," accepted for publication in Digital Communications and Networks, Nov. 2023.

   <2024>      

3. Md. R. A. Ruku., Md. Ibrahim, A. S. M. Badrudduza, I. S. Ansari, W. Khalid, Heejung Yu, "Effects of Co-channel Interference on RIS Empowered Wireless Networks amid Multiple Eavesdropping Attempts," ICT Express, vol. 10, no. 3, pp. 491-497, Jun. 2024.

4. J. Jeon, J. Lee, T. Kim, J. Ahn, Y. Yu, M. Lee, Heejung Yu, H. Lee, "HyPE: Online Hybrid Pseudo-Bayesian Estimation Method for S-ALOHA-Based Tactical FANETs," IEEE Access, vol. 12, pp. 79957-79966, Jun. 2024,

5. M. K. Ghosh, M. K. Kundu,MD. Ibrahim, A. S. M. Badrudduza, MD. S. Anower, I. S. Ansari, A. Solomon, S. Chakravarty, I. Ahmed, Heejung Yu, "Physical Layer Security in Mixed UOWC-RF Networks with Energy Harvesting Relay against Multiple Eavesdroppers," IEEE Open Journal of the Communications Society, vol. 5, pp. 2884-2902, May 2024.

6. Z. Kaleem, W. Khalid, A. Ahmad, Heejung Yu, A. Almasoud, C. Yuen, "Reinforcement Learning for Energy-Efficient User Association in UAV-Assisted Cellular Networks," IEEE Transactions on Aerospace and Electronic Systems, vol. 60, no. 2, pp. 2474-2481, Apr. 2024.

7. T. V. Chien, L. T. Tu, W. Khalid, Heejung Yu, S. Chatzinotas, M. Di Renzo, "RIS-Assisted Wireless Communications: Long-Term versus Short-Term Phase Shift Designs," IEEE Transactions on Communications, vol. 72, no. 2, pp. 1175-1190, Feb. 2024.

8. Waqas Khalid, M. Atif Ur Rehman, Trinh Van Chien, Zeeshan Kaleem, Howon Lee, and Heejung Yu, "Reconfigurable Intelligent Surface for Physical Layer Security in 6G-IoT: Designs, Issues, and Advances," IEEE Internet of Things Journal, vol. 11, no. 2, pp. 3599-3613, Jan. 2023.

9. J. Wu, S. A. Haider, Heejung Yu, M. Irshad, M. Soni, M. K. Bhadla, Y. B. Zikria, "An intelligent IoT intrusion detection system using HeInit-WGAN and SSO-BNMCNN based multivariate feature analysis," Engineering Applications of Artificial Intelligence, vol. 127, part A, 107132, Jan. 2024.

   <2023>

10. M. M. Rahman, A. S. M. Badrudduza, N. A. Sarker, M. Ibrahim, I. S. Ansari, and Heejung Yu, "RIS-aided Mixed RF-FSO Wireless Networks: Secrecy Performance Analysis with Simultaneous Eavesdropping," IEEE Access, vol. 11, pp. 126507 - 126523, Nov. 2023.

11. S. Noh, K. Seo, Y. Sung, D. J. Love, J. Lee, and Heejung Yu, "Joint Direct and Indirect Channel Estimation for RIS-Assisted Millimeter-wave Systems Based on Array Signal Processing," IEEE Transactions on Wireless Communications, vol. 22, no. 11, pp. 8378-8391, Nov. 2023.

12. S. Saleem, F. Hussain, W. Amin, R. A. Ahmed, Y. B. Zikria, F. Ishmanov, and Heejung Yu, "A Survey on Dynamic Application Mapping Approaches for Real-Time Network-on-Chip Based Platforms," IEEE Access, vol. 11, pp. 122694-122721, Nov. 2023.

13. W. Amin, F. Hussain, S. Anjum, S. Saleem, N. K. Baloch, Y. B. Zikria, Heejung Yu, "Efficient Application Mapping Approach Based on Grey Wolf Optimization for Network on Chip," Journal of Network and Computer Applications, vol. 2189, Article no. 103729, Oct. 2023.

14. W. Khalid, Z. Kaleem, R. Ullah, T. V. Chien, S. Noh, and Heejung Yu, "Simultaneous Transmitting and Reflecting-Reconfigurable Intelligent Surface in 6G: Design Guidelines and Future Perspectives," IEEE Network, vol. 37, no. 5, pp. 173-181, Sep. 2023.

15. D.-H. Jung, G. Im, J.-G. Ryu, S. Park, Heejung Yu, and J. Choi, "Satellite Clustering for Non-Terrestrial Networks: Concept, Architectures, and Applications," IEEE Vehicular Technology Magazine, vol. 18, no. 3, pp. 29-37, Sep. 2023.

16. J. Joung, Heejung Yu, T. Q. S. Quek, "Integrated Single Target Sensing and Multiuser Communications Based on Zero-Forcing Beamforming," Vehicular Communications, vol. 43, Article no. 100637, Oct. 2023.

17. M. Shahjalal, W. Kim, W. Khalid, S. Moon, M. Khan, S. Liu, S. Lim, E. Kim, D. Yun, J. Lee, W. Lee, S. Hwang, D. Kim, J. Lee, H. Yu, Y. Sung, and Y. Jang, "Enabling technologies for AI-empowered 6G massive radio access networks," ICT Express, vol. 9, no. 3, pp. 341-355, Jun. 2023.

18. Q. Arshad, W. Z. Khan, F. Azam, M. K. Khan, Heejung Yu, Y. B. Zikria, "Blockchain-based Decentralized Trust Management in IoT: Systems, Requirements and Challenges," Complex and Intelligent Systems, Apr. 2023. 

19. P. Karthik, P. Shanthibala, A. Bhardwaj, S. Bharany, Heejung Yu,Y. B. Zikria, "A Novel Subset-based Polynomial Design for Enhancing the Security of Short Message-Digest with Inflated Avalanche and Random Responses," Journal of King Saud University-Computer and Information Science, vol. 35, no. 1, pp. 310-323, Jan. 2023.

<2022>

20. J. Kim, Heejung Yu, X. Kang, and J. Joung, "Discrete Phase Shifts of Intelligent Reflecting Surface Systems Considering Network Overhead," Entropy,  vol. 24, no. 12, Nov. 2022. 

21. S. Lim, Heejung Yu, and H. Lee, "Optimal Tethered-UAV Deployment in A2G Communication Networks: Multi-Agent Q-Learning Approach," IEEE Internet of Things Journal, vol. 9, no. 19, pp. 18539-18549, Oct. 2022. 

22. S. Noh, J. Lee, Heejung Yu, and J. Song, "Design of Channel Estimation for Hybrid Beamforming Millimeter Wave Systems in the Presence of Beam Squint," IEEE Systems Journal, vol. 16, no. 2, pp. 2834-2843, June 2022.

23. S. Noh, J. Lee, G. Lee, K. Seo, Y. Sung, and  Heejung Yu, "Channel Estimation Techniques for RIS-Assisted Communication: Millimeter-Wave and Sub-THz Systems," IEEE Vehicular Technology Magazine, vol 17, no. 2, pp. 64-73, June 2022.

24. S. Noh, J. Song, J. Lee, and H. Yu, "High-resolution and Low-complexity Direction of Arrival Estimation for Hybrid Array of Subarrays," IEEE Access, vol. 10, pp. 54922-54935, May 2022.

25. J. M. Park, J. Cho, S. Noh, and H. Yu, "Optimal Pilot and Data Power Allocation for Joint Communication-Radar Air-to-Ground Networks," IEEE Access, vol. 10, pp. 52336-52342, May 2022.

26. S. Lee, Heejung Yu, and H. Lee, " Multiagent Q-Learning-Based Multi-UAV Wireless Networks for Maximizing Energy Efficiency: Deployment and Power Control Strategy Design," IEEE Internet of Things Journal, vol. 9, no. 9, pp. 6434-6442, May 2022.

27. S. Noh, Heejung Yu, and Y. Sung, "Training Signal Design for Sparse Channel Estimation in Intelligent Reflecting Surface-Assisted Millimeter-Wave Communication," IEEE Transactions on Wireless Communications, vol. 21, no. 4, pp. 2399-2413, Apr. 2022.

28. W. Khalid, Heejung Yu, J. Cho, Z. Kaleem, S. Ahmad, “Rate-Energy Tradeoff Analysis in RIS-SWIPT Systems with Hardware Impairments and Phase-Based Amplitude Response,” IEEE Access, vol. 10, pp. 31821-31835, Mar. 2022.

29. F. Mehmood, N. K. Baloch, F. Hussain, W. Amin, M. S. Hossain, Y. B. Zikria, Heejung Yu, "An efficient and cost effective application mapping for network-on-chip using andean condor algorithm," Journal of Network and Computer Applications, vol. 200, Apr. 2022, Art. no. 103319.

30. C.-B. Le, D.-T. Do, A. Silva, W. U. Khan, W. Khalid, Heejung Yu, N. D. Hguyen, "Joint Design of Improved Spectrum and Energy Efficiency with Backscatter NOMA for IoT," IEEE Access, vol. 10, pp. 7504-7519, Jan. 2022. 

    <2021>

31. F. Azam, A. Rizvi, W. Z. Khan, M. Y.  Aalsalem, Heejung Yu, Y. B. Zikria, "Aircraft Classification Based on PCA and Feature Fusion Techniques in Convolutional Neural Network," IEEE Access, vol. 9, pp. 161683-161694, Dec. 2021.

32. Heejung Yu, J. Joung, "Secure IoT Communications Using HARQ-based Beamforming for MISOSE Channels," IEEE Internet of Things Journal, vol. 8, no. 23, pp. 17211-17226,  Dec. 2021.

33. S. M. S. Shahriyer, A. S. M. Badrudduza, S. Shabab, M. K. Kundu, Heejung Yu, "Opportunistic Relay in Multicast Channels with Generalized Shadowed Fading Effects: A Physical Layer Security Perspective," IEEE Access, vol. 9, pp. 155726-155739, Nov. 2021.

34. M. J. Mohiz, N. K. Baloch, F. Hussain, S. Saleem, Y. B. Zikria, Heejung Yu, "Application Mapping using Cuckoo Search Optimization with Lévy Flight for NoC Based System," IEEE Access, vol. 9, pp. 141778-141789, Oct. 2021.

35. I.-G. Lee, D. B. Kim, J. Choi, H. Park, S.-K. Lee, J. Cho, and Heejung Yu, "Wi-Fi HaLow for Long-Range and Low-Power Internet of Things: System on Chip Development and Performance Evaluation," IEEE Communications Magazine, vol. 59, no. 7, pp. 101-107, Jul. 2021.

36. S. Sikandar, N. K. Baloch, F. Hussain, W. Amin, Y. B. Zikria, Heejung Yu, "An Optimized Nature-inspired Metaheuristic Algorithm for Application Mapping in 2D-NoC," Sensors, vol. 21, no. 15, Jul. 2021.

37. W. Khalid, Heejung Yu, D.-T. Do, Z. Kaleem, and S. Noh, "RIS-Aided Physical Layer Security with Full-Duplex Jamming in Underlay D2D Networks," IEEE Access, vol. 9, pp. 99667-99679, Jul. 2021.

38. Heejung Yu and J. Joung, "Design of the Power and Dimension of Artificial Noise for Secure Communication Systems," IEEE Transactions on Communications, vol. 69, no. 6, pp. 4001-4010, Jun. 2021.

39. Jingon Joung, Heejung Yu, and J. Zhao, "Bandwidth Design for Energy Efficient Unmanned Aerial Vehicle Using Space-Time Line Code," IEEE Systems Journal, vol. 15, no. 2, pp. 3154-3157, Jun. 2021.

40. Heejung Yu, Jingon Joung, "Frame Structure Design for Vehicular-to-Roadside Unit Communications Using Space-Time Line Code under Time-Varying Channels," IEEE Systems Journal, vol. 15, no. 2, pp. 3150-3153, Jun. 2021. 

41. Waqas Khalid, Heejung Yu, Rashid Ali, Rehmat Ullah, "Advanced Physical-Layer Technologies for Beyond 5G Wireless Communication Networks," Sensors, vol. 21, no. 9, May 2021. (Editorial)

42. S. H. Islam, A. S. M. Badrudduza, S. M. R. Islam, F. I. Shahid, I. S. Ansari, M. K. Kundu, Heejung Yu, "Impact of Correlation and Pointing Error on Secure Outage Performance over Arbitrary Correlated Nakagami-m and M-Turbulent Fading Mixed RF-FSO Channel," IEEE Photonics Journal, vol. 13, no. 2, Apr. 2021.

43. Heejung Yu, Jingon Joung, "Optimization of frame structure and fronthaul compression for uplink C-RAN under time-varying channels," IEEE Transactions on Wireless Communications, vol. 20, no. 2, pp. 1278-1292, Feb. 2021.

44. A. S. M. Badrudduza, M. Ibrahim, S. M. R. Islam, M. S. Hossen, M. K. Kundu, I. S. Ansari, Heejung Yu "Security at the physical layer over GG fading and mEGG turbulence Induced RF-UOWC mixed system," IEEE Access, vol. 9, pp. 18123-18136, Feb. 2021.

45. Waqas Khalid, Heejung Yu, "Security improvement with QoS provisioning using service priority and power allocation for NOMA-IoT networks," IEEE Access, vol. 9, pp. 9937-9948, Jan. 2021.

     <2020>

46.  M. S. Kamal, M. F. Kader, S. M. R. Islam, Heejung Yu, "Device-to-device aided cooperative relaying scheme exploiting spatial modulation: an interference free strategy," Sensors, vol. 20, no. 24, Dec. 2020.

47. Heejung Yu, Howon Lee, "Joint optimization of power and fronthaul compression for data and pilot signals in uplink C-RANs," IEEE Systems Journal, vol. 14, no. 4, pp. 4990-5001, Dec. 2020. 

48. M. Farooq, F. Hussain, N. K.  Baloch, F. R. Raja,  Heejung Yu, Y. B. Zikria, "Impact of feature selection algorithm on speech emotion recognition using deep convolutional neural network," Sensors, vol. 20,  no. 21, Nov. 2020.

49. M. Rashid, N. K. Baloch, M. A. Shafique, F. Hussain, S. Saleem, Y. B. Zikria, and Heejung Yu "Fault-tolerant Network-On-Chip router architecture design for heterogeneous computing systems in the context of Internet of Things," Sensors, vol. 20, no. 18, Sep. 2020.

50. Heejung Yu, Y. B. Zikria, "Cognitive radio networks for Internet of Things and wireless sensor networks," Sensors, vol.  20, no. 18, Sep. 2020. (Editorial)

51. M. Sohail, R. Ali, M. Kashif, S. A. Khan, S. Mehta, Y. B. Zikria, Heejung Yu, "TrustWalker: an efficient trust assessment in vehicular Internet of Things (VIoT) with security consideration," Sensors, vol. 20, no. 14, Jul. 2020.

52. A. S. M. Badrudduza, N. A. Sarker, S. M. R. Islam, S. H. Islam, I. S. Ansari, M. K. Kundu, M. F. Samad, M. B. Hossain, and Heejung Yu, "Secrecy performance analysis of mixed Hyper-Gamma and Gamma-Gamma cooperative relaying system," IEEE Access, vol. 8, pp. 131273-131285, Jul. 2020.

53. Waqas Khalid, Heejung Yu, Song Noh, "Residual energy analysis in cognitive radios with energy harvesting UAV under reliability and secrecy constraints," Sensors, vol. 20, no. 10, May 2020. 

54. Heejung Yu, Muhammad Khalil Afzal, Yousaf Bin Zikria,  Abderrezak Rachedi, Frank H.P. Fitzek, "Tactile Internet: Technologies, test platforms, trials, and applications," Future Generation Computer Systems, vol. 106, pp. 685-688, May 2020. (Editorial)

55. Md. Sipon Miah, Kazi Mowdud Ahmed, Md. Khairul Islam, Md. Ashek Raihan Mahmud, Md. Mahbubur Rahman, Heejung Yu, "Enhanced sensing and sum-rate analysis in a cognitive radio-based Internet of Things," Sensors, vol. 20, no. 9, May 2020. 

56. Byounghak Kim, Heejung Yu, Song Noh, "Cognitive interference cancellation with digital channelizer for satellite communication," Sensors, vol. 20, no. 2, Jan. 2020.

57. Heejung Yu, Il-Gu Lee, "Physical layer security based on NOMA and AJ for MISOSE channels with an untrusted relay," Future Generation Computer Systems, vol. 102, pp. 611-618, Jan. 2020.

58. Heejung Yu, Taejoon Kim, "Optimization of uplink rate and fronthaul compression in cloud radio access networks," Future Generation Computer Systems, vol. 102, pp. 465-471, Jan. 2020.

    <2019>

59. Murtaza Ahmed Siddiqi, Heejung Yu, Jingon Joung, "5G ultra-reliable low-latency communication implementation challenges and operational issues with IoT devices," Electronics, vol. 9, no. 9, Sep. 2019.  

60. Youngseok Oh, Sungmin Cho, Heejung Yu, "Wireless backhaul based on IEEE 802.11ac with smart beamforming," IEEE Systems Journal, vol. 13, no. 3, pp. 2354-2362, Sep. 2019.

61. Heejung Yu, Taejoon Kim, "Training and data structures for AN-aided secure communication," IEEE Systems Journal, vol. 13, no. 3, pp. 2869-2872, Sep.. 2019.  

62. Waqas Khalid, Heejung Yu, "Spatial-temporal sensing and utilization in full duplex spectrum-heterogeneous cognitive radio networks for Internet of Things," Sensors, vol. 19, no. 6, 1441, Mar. 2019. 

   <2018>

63. Yousaf Bin Zikria, Heejung Yu, Muhammad Khalil Afzal, Mubashir Husain Rehmani, Oliver Hahmd, "Internet of Things (IoT): Operating system, applications and protocols design, and validation techniques," Future Generation Computer Systems, vol. 88, pp. 699-706, Nov. 2018. (Editorial)

64. Taejoon Kim, Heejung Yu*, "Resource planning and backhaul-link optimisation for relay networks," IET Communications, vol. 12, no. 17, pp. 2076-2086, Oct. 2018.

65. Seongjin Kim, Heejung Yu, "Energy-efficient HARQ-IR for massive MIMO systems," IEEE Transactions on Communications, vol. 66, no. 9, pp. 3892-3901, Sep. 2018.

66. Heejung Yu, Taejoon Kim, Hamid Jafarkhani, "Wireless Secure Communication With Beamforming and Jamming in Time-Varying Wiretap Channels," IEEE Transaction on Information Forensics and Security, vol. 13, no. 8, pp. 2087-2100, Aug. 2018.

67. Muhammad Shafiq, Maqbool Ahmad, Azeem Irshad, Moneeb Gohar, Muhammad Usman, Muhammad Khalil Afzal, Heejung Yu, Jin-Ghoo Choi, "Multiple access control for cognitive radio-based IEEE 802.11ah networks," Sensors, vol. 18, no. 7, 2043, Jun. 2018.

68. Yousaf Bin Zikria, Farruh Ishmanov, Muhammad Khalil Afzal, Sung Won Kim, Seung Yeob Nam, Heejung Yu, "Opportunistic channel selection MAC protocol for cognitive radio ad hoc sensor networks in the internet of things," Sustainable Computing: Informatics and Systems, vol. 18, pp. 112-120, Jun. 2018.

69. Waqas Khalid, Heejung Yu, "Sum utilization of spectrum with spectrum handoff and imperfect sensing in interweave multi-channel cognitive radio networks," Sustainability, vol. 10, no. 6, 1764, May 2018.

70. Yousaf Bin Zikria, Muhammad Khalil Afzal, Farruh Ishmanov, Sung Won Kim, Heejung Yu, "A survey on routing protocols supported by the Contiki Internet of things operating system," Future Generation Computer Systems, vol. 82, pp. 200-219, May 2018.

71. A. Musaddiq, Y. B. Zikria, O. Hahm, Heejung Yu, A. K. Bashir, S. W. Kim, "A survey on resource management in IoT operating systems," IEEE Access, vol. 6, pp. 8459-8482, Mar. 2018.

   <2017>

72. Sooyeob Jung, Joon Gyu Ryu, Deock-Gil Oh, Heejung Yu, "Self-interference cancellation for shared band transmission in nonlinear satellite communication channels," ETRI Journal, vol. 39, no. 6, pp. 771-781, Dec. 2017. 

73. Taejoon Kim, Kwanghoon An, Heejung Yu, "Optimal Resource Planning with Interference Coordination for Relay-Based Cellular Networks," KSII Transactions on Internet and Information Systems, vol.11. no. 11, pp. 5264-5281, Nov. 2017. 

74. Waqas Khalid, Heejung Yu, "Optimal sensing performance for cooperative and non-cooperative cognitive radio networks," International Journal of Distributed Sensor Networks, vol. 13, no. 11, Nov. 2017.

75. Heejung Yu, Howon Lee, Hongbeom Jeon, "What is 5G? Emerging 5G mobile services and network requirements," Sustainability, vol. 9, no. 10, 1814, Oct. 2017.

76. Seongjin Kim, Heejung Yu, "Energy- and spectral-efficiency trade-off in OFDMA downlink channels," Wireless Personal Communications, vol. 94, no. 4, pp. 6355-6367, Oct. 2017.

77. Sungmin Cho, Yeongseok Oh, Heejung Yu, Woongup Lee, "A new cellular network structure deploying shared relays with sectorization," Wireless Personal Communications, vol. 94, no. 4, pp. 2987-2999, Jun. 2017.

78. Taejoon Kim, Kwanghoon An, Heejung Yu, "Performance Analysis of Centralised and Distributed Scheduling Schemes for Mobile Multihop Relay Systems," IET Communications, vol. 11, no. 1, pp. 69-75, Jan. 2017.

   <2016>

79. Taejoon Kim, Byung-Kwan Kim, Heejung Yu, "Efficient Resource Allocation for Proportional Fair Schedulers in Multihop Relay Networks," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E99-A, no. 9, Sep. 2016.

80. Seongjin Kim, Heejung Yu, "Energy-Efficient Resource Allocation in Multi-User AF Two-Way Relay Channels," Journal of Communications and Networks, vol.18, no. 4, Aug. 2016.

81. Heejung Yu, Taejoon Kim, "Regularized zero-forcing beam design under time-varying channels," ETRI Journal, vol. 38, no. 3, pp. 435-443, June 2016.

82. Heejung Yu, "Optimal primary pilot power allocation and secondary channel sensing in cognitive radios," IET Communications, vol 10, no. 5, pp. 487-494, Mar. 2016. 

    <Before 2015>

83. Yousaf Bin Zikria, Sung Won Kim, Heejung Yu, Seong Yeob Nam, "An analytical approach to opportunistic transmission under Rayleigh fading channels," International Journal of Distributed Sensor Networks, vol. 2015, 8 pages, 2015.

84. Heejung Yu, "A review on interference alignment in multiuser interference channels," Wireless Personal Communications, vol. 83, no. 3 , pp 1751-1764, Aug. 2015.

85. Md. Sipon Miah, Heejung Yu, Tapan Kumar Godder, Md. Mahbubur Rahman, "A Cluster-Based Cooperative Spectrum Sensing in Cognitive Radio Network Using Eigenvalue Detection Technique with Superposition Approach," International Journal of Distributed Sensor Networks, 2015. 11 pages, 2015.

86. Haksoo Kim, Heejug Yu, Yong H. Lee, "Limited feedback for multi-cell zero-forcing coordinated beamforming in time-varying channels," IEEE Transactions on Vehicular Technology, vol. 64, no. 6, pp. 2349 - 2360, Jun. 2015.

87. M. Md Sipon, Heejung Yu, R. Md Mahbubur, "Super-allocation and Cluster-based Cooperative Spectrum Sensing in Cognitive Radio Networks," KSII Transactions on Internet and Information Systems, vol. 8, no 10, pp. 3302-3320, Oct. 2014.

88. Heejung Yu and Taejoon Kim, “Beamforming Transmission in IEEE 802.11ac under Time-Varying Channels,” The Scientific World Journal, vol. 2014, Article ID 920937, 11 pages, 2014.

89. Junse Lee, Heejung Yu, Youngchul Sung, "Beam tracking for interference alignment in slowly-fading MIMO interference channels: A conjugate gradient based approach," IEEE Transactions on Vehicular Technology, vol. 63, no. 2, pp. 958-964, Feb. 2014.

90. Joon-Gyu Ryu, Deock-Gil Oh, Heejung Yu, "Design of maritime satellite communication systems sharing frequency with DVB-S2," Journal of Korea Society of Communication and Space Technology, vol. 8, no. 4, pp. 75-80, Dec. 2013.

91. Heejung Yu, "Optimal channel sensing for heterogeneous Cognitive Networks: An Analytical Approach," KSII Transactions on Internet and Information Systems, vol. 7, no. 12, pp. 2987-3002, Dec. 2013.

92. Heejung Yu, "Optimal Channel Sensing Maximizing Sum Rate in Cognitive Radio with Multiple Secondary Links," Transactions on Emerging Telecommunications Technologies, vol. 7-8, pp. 777-784, Nov.-Dec., 2013.

93. Heejung Yu, "Standardization and Technical Trend of IEEE 802.11af and IEEE 802.11ah," Telecommunications Review, vol. 23, pp. 420-431, Aug. 2013.

94. Heejung Yu, Eui-rim Jeong, “Cognitive beamforming and power control in time-varying channels: design and analysis,” IEICE Trans. Commun., vol. E96-B, no. 6, pp. 1616-1624, Jun. 2013.

95. Heejung Yu, Juho Park, Youngchul Sung, and Yong H. Lee, "Interference alignment for multiuser inteference channels," The Magazine of the IEEK, vol. 40, pp. 348-360. Apr. 2013.

96. Heejung Yu, Sok-kyu Lee, "Beamforming for downlink multi-user MIMO time-varying channels based on generalized eigenvector perturbation," ETRI Journal, vol. 34, no. 6, pp 869-878, Dec. 2012.

97. Haksoo Kim, Heejung Yu, Youngchul Sung, and Yong H. Lee, "An Efficient Algorithm for Zero-Forcing Coordinated Beamforming," IEEE Communications Letters, vol. 16, no. 7, pp. 994-997, Jul. 2012.

98. Jee-Hoon Kim, Heejung Yu, and Sok-kyu Lee, "Channel estimation scheme for WLAN systems with backward compatibility," ETRI Journal, vol. 34. no. 3, pp. 450-453, Jun. 2012.

99. Youngseok Oh, Heejung Yu, Youngchul Sung, and Yong H. Lee, “A nonlinear transceiver architecture for overloaded multiuser MIMO interference channels,” IEEE Trans. Commun., vol. 60, no. 4, pp. 946 - 951, Apr. 2012.

100. Heejung Yu, Youngchul Sung, Haksoo Kim, and Yong H. Lee, “Beam tracking for interference alignment in slowly-fading MIMO interference channels: A perturbations approach under a linear framework,” IEEE Trans. Signal Process., vol. 60, no. 4, pp. 1910 - 1926, Apr. 2012.

101. Heejung Yu and Youngchul Sung, “Least squares approach to joint beam design for interference alignment in multiuser multi-input multi-output interference channels,” IEEE Trans. Signal Process., vol. 58, no. 9, pp. 4960 - 4966, Sep. 2010.

102. Youngchul Sung, H. Vincent Poor, and Heejung Yu, “How much information can one get from a wireless ad hoc sensor network over a correlated random field,” IEEE Trans. Inf. Theory, vol. 55, no. 6, pp. 1827 - 1847, Jun. 2009.

103. Chanho Yoon, Jaekwon Kim, Heejung Yu, Sok-kyu Lee and Joonhyuk Kang, “Bandwidth Efficient MC-CDMA Transmission over Frequency Selective Fading Channel in 1xEV-DV System,” IEICE Trans. Commun., vol. E89-B(4), pp. 1451-1454, Apr. 2006.

104. Jihoon Choi, Heejung Yu, and Yong H. Lee, “Adaptive MIMO Decision Feedback Equalization for Receivers with Time-Varying Channels,” IEEE Trans. on Signal Processing, vol. 53, no. 11, pp. 4295-4303, Nov. 2005.

105. Heejung Yu, Taehyun Jeon, Myung-Soon Kim, Eun-young Choi, and Sok-kyu Lee, “Design and Prototype Development of MIMO-OFDM for Next GenerationWireless LAN,” IEEE Transaction on Consumer Electronics, vol. 51, no. 4, pp. 1134-1142, Nov. 2005.

Domestic Journals (KCI)

1. 유준규, 전학익, 오덕길, 유희정, "동일 주파수 위성 전송을 위한 자기 간섭 제거 방식," 한국위성정보통신학회논문지, 10권, 5호, pp 101-106, 2015년.

2. 유준규, 오덕길, 유희정 "DVB-S2와 주파수 공유하는 해양 위성 통신 시스템 설계," 한국위성정보통신학회논문지, 8권, 4호, pp 75-80, 2013년.

3. Seokhyun Yoon, Heejung Yu, Il-Gu Lee, Taehyun Jeon, and Sok-kyu Lee, “Performance Evaluation of Channel Shortening Time Domain Equalizer in Wireless LAN Environment,” KICS Journal, vol. 31, no. 3A, pp. 240-248, Mar. 2006.

4. Jihoon Choi, Heejung Yu, and Yong H. Lee, “Adaptive Equalization for MIMO Systems in Time-Varying Channels,” Telecommunications Review, vol. 14, no. 3, pp. 449-462, Jun. 2004.

5. Heejung Yu, Taehyun Jeon, and Sok-Kyu Lee, “Transmission Technologies and Standardization for Next Generation Wireless LAN,” Telecommunications Review, Special Edition of wireless communication and broadcasting, pp. 80-101, Dec. 2003. (Invited)

6. Jae-Young Ahn and Heejung Yu, “Transmission Technologies for Next Generation Wireless LAN,” Telecommunications Review, vol. 12, no. 6, pp. 810-825, Dec. 2002.

International Conferences

1. W. Khalid, H. Yu, and A. Alexandros, "Outage Analysis for Active Reconfigurable Intelligent Surface-Enhanced Wireless Powered Communication Networks," In Proc. ICAIIC, Osaka, Japan, Feb. 2024.

2. W. Khalid, M Nair, H Yu, and T. V. Chien, "Impact of RIS on Outage Probability and Ergodic Rate in Wireless Powered Communication," In Proc.14th International Conference on ICT Convergence (ICTC), Jeju, South Korea. Oct. 2023.

3. W. Khalid, M. Atif, T. V. Chien, and H. Yu. "Simultaneously Transmitting and Reflecting-Reconfigurable Intelligent Surfaces with Hardware Impairment and Phase Error," in ICAIIC, Bali, Indonesia, Feb. 2023.

4. J. M. Park, H. Lee and Heejung Yu, "Optimal Power and Position Control for UAV-assisted JCR Networks: Multi-Agent Q-Learning Approach," in Proc. IEEE Consumer Communications & Networking Conference (CCNC), Las Vegas, NV, USA, 2023, pp. 700-701.

5. W. Khalid, M. Shahjalal and Heejung Yu, "Outage Performance Analysis of Hybrid Relay-Reconfigurable Intelligent Surface Networks," in Proc. Asia Pacific Conference on Communications (APCC), Jeju Island, South Korea, 2022, pp. 253-254.

6. W. Khalid and Heejung Yu, "On the Impact of Transceiver Impairments and Reflecting Elements for RIS-Aided Communications," International Conference on Information and Communication Technology Convergence (ICTC), Jeju Island, South Korea, 2021, pp. 899-901.

7. S. Noh, Heejung Yu and Y. Sung, "Training Signal Design for Sparse Channel Estimation in Millimeter-Wave Communication with Intelligent Reflecting Surfaces," in Proc. IEEE International Conference on Communications Workshops (ICC Workshops), Montreal, QC, Canada, 2021, pp. 1-6.

8. Waqas Khalid, Heejung Yu, "Residual Energy Analysis with Physical-Layer Security for Energy-Constrained UAV Cognitive Radio Systems," in Proc. International Conference on Electronics, Information, and Communication (ICEIC) 2020, Barcelona, Spain, Jan. 2020.

9. Waqas Khalid, Heejung Yu, "Sensing and Utilization of Spectrum with Cooperation Interference for Full-Duplex Cognitive Radio Networks," in Proc. International Conference on Ubiquitous and Future Networks 2019, Zagreb, Croatia, Jun. 2019.

10. Sooyeob Jung, Joon Gyu Ryu, Deock-gil. Oh, Heejung Yu, "Low-Complexity Nonlinearity Post Compensator for Shared Band Transmission in Satellite Communication," in Proc. International Symposium on Wireless Communication Systems (ISWCS), Lisbon, Portugal, Aug. 2018.

11. Waqas Khalid, Yousaf Bin Zikria, Heejung Yu, "Improvement of Spectrum Utilization with Retransmission in Cognitive Radio Networks: Analytical Approach," in Proc. International Congress on Ultra Modern Telecommunications and Control Systems and Workshops (ICUMT), Munich, Germany, Nov. 2017.

12. Waqas Khalid, Heejung Yu, "Optimization of Sum-Utilization of Spectrum and Sum-Rate in Cognitive Radio Networks with Different Primary Activities," in Proc. Asia Pacific Wireless Communications Symposium 2017 (APWCS), Incheon, Korea, Aug. 2017.

13. Illa Ul Rasool, Yousaf Bin Zikria, Heejung Yu, Sung Won Kim, “Congestion Control Strategy in NDN-RIOT-OS Powered IoTs,” in Proc. International Conference on Information and Communication Technology and Digital Convergence Business, Seoul, Korea, Dec. 2016.

14. Yousaf Bin Zikria, Rashid Ali, Rojeena Bajracharya, Heejung Yu, Sung Won Kim, “IoT Theoretical to Practical: Contiki-OS and Zolertia Re-Mote,” in Proc. International Conference on Information and Communication Technology and Digital Convergence Business, Seoul, Korea, Dec. 2016.

15. Youngseok Oh, Sungmin Cho, Jinhyo Park, Hyukjun Oh, Heejung Yu, “Smart beamforming based wireless backhaul for cost-effective small cells,” in Proc. 2016 URSI Asia-Pacific Radio Science Conference (URSI AP-RASC), Seoul, Korea, Aug. 2016.

16. Heejung Yu, Waqas Khalid, “Secure Communication with Beamforming and Jamming in Time-Varying Channels,” in Proc. International Conference on Ubiquitous and Future Networks 2016, Vienna, Austria, Jun. 2016.

17. Heejung Yu, "An efficient RZF beamforming based on new formulation," in Proc. 10th International Symposium on Embedded Technology, Daegu, Korea, Jun. 2015.

18. Heejung Yu, "Standardization of Next Generation WiFi," in Proc. 10th International Symposium on Embedded Technology, Daegu, Korea, Jun. 2015. (Invited.)

19. Heejung Yu, "Comparison of MIMO Schemes in IEEE 802.11ac under Time-varying Channels: Analytical Approach," in Proc. IEEE ICCE-Berlin, Berlin, Germany, Sep. 2014. 

20. Heejung Yu, "Optimal channel sensing in cognitive radio network with multiple secondary users," in Proc. Grid and Pervasive Computing,  Seoul, Korea, May 2013.

21. Heejung Yu, Jeong-Chul Shin and Sok-kyu Lee, "Multi-user MIMO downlink beamforming based on perturbation theory of generalized eigenvector," in Proc. of ISWCS, Paris, France, Aug. 2012.

22. Junse Lee, Heejung Yu, Youngchul Sung and Yong H. Lee, “Adaptive beam tracking for interference alignment for time-varying MIMO interference channels: Conjugate gradient approach,” in Proc. of ICASSP, Prague, Czech Republic, May 2011.

23. Heejung Yu, Ji-Hoon Kim, Sok-kyu Lee, “Beamforming and transmit power control schemes for cognitive radio systems with multiple antennas,” in Proc. of JCCI, Pusan, Korea, May, 2011.

24. Heejung Yu, Sok-kyu Lee, “Cognitive beam design and transmit power control for cognitive radio networks in time-varying channels,” in Proc. of European Wireless, Vienna, Austria, May, 2011.

25. Heejung Yu, Youngchul Sung, Haksoo Kim, and Yong H. Lee, “Adaptive beam tracking for interference alignment for multiuser time-varyingMIMO interference channels,” in Proc. of ICASSP, Dallas, Texas, Mar. 2010.

26. Heejung Yu and Youngchul Sung, “Iterative algorithm for interference alignment in multiuser MIMO interference channels,” in Proc. IEEE SPAWC, Marrakech,Morocco, June 2010.

27. Heejung Yu, Youngchul Sung, and Yong H. Lee, “Joint optimization of transmit power and operating point of channel sensing for cognitive radio networks,”, in Proc. JCCI, Anmyeondo, Korea, May 2010.

28. Heejung Yu, Juho Park, Youngchul Sung, and Yong H. Lee, “A least squares approach to joint beam design for interference alignment in multiuser interference channels,” in Proc. IEEE SPAWC, Perugia, Italy, June 2009.

29. Haksoo Kim, Sungho Choi, Heejung Yu, Youngchul Sung, and Yong H. Lee, “Amplify-forward relays with superimposed pilot signals for frequency-selective fading channels,” in Proc. IEEE VTC, Barcelona, Spain, Apr. 2009.

30. Heejung Yu, Youngchul Sung, and Yong H. Lee, “Superposition data transmission for cognitive radios: Performance and algorithms,” in Proc. IEEE MILCOM, San Diego, CA, Nov, 2008.

31. Youngchul Sung, H. Vincent Poor, and Heejung Yu, “Information, energy and density for ad hoc sensor networks over correlated random fields: Large deviations analysis,” in Proc. IEEE ISIT, Toronto, Canada, July 2008.

32. Youngchul Sung, H. Vincent Poor, and Heejung Yu, “Optimal node density for two-dimensional sensor arrays,” in Proc. IEEEWorkshop on Sensor Array andMulti-Channel Signal Processing (SAM), Darmstadt, Germany, July 2008.

33. Heejung Yu, Youngchul Sung, and Yong H. Lee, “Superposition data transmission for secondary user in cognitive radios,”in JCCI, Jeju, Korea, Apr. 2008.

34. Heejung Yu, Youngchul Sung, and Yong. H. Lee, “On optimal operating characteristics of sensing and training for cognitive radios,” in Proc. IEEE ICASSP, Las Vegas, Nevada, Mar. 2008.

35. Youngchul Sung, H. V. Poor, and Heejung Yu, “Large deviations analysis for the detection of 2-D hidden Gauss-Markov random fields using sensor networks,” in Proc. IEEE ICASSP, Las Vegas, Nevada, Mar. 2008.

36. Il-Gu Lee, Heejung Yu, EunyoungChoi, Jungbo Son, and Sok-Kyu Lee, “Design and implementation of robust time/frequency offset tracking algorithm for MIMO-OFDM receivers,” in Proc. IEEE VTC, Melbourne, Australia, May 2006.

37. Heejung Yu, Kyonghee Song, Kwhanghyun Ryu, Yunjoo Kim, Seungwook Min, and Sok-kyu Lee, “Design and FPGA implementation of MIMO-OFDM based WLAN Systems,” in Proc. IEEE VTC, Melbourne, Australia, May 2006.

38. Heejung Yu, Kwhanghyun Ryu, Kyonghee Song, Yunjoo Kim, Seungwook Min, and Sok-kyu Lee, “Next generation wireless LAN system design and implementation based onMIMO-OFDM,” in Proc. IEEE WCNC, Las Vegas, Nevada, Apr. 2006.

39. Il-Gu Lee, Heejung Yu, Sok-Kyu Lee, Jin Lee, Sin-Chong Park, “Efficient pattern-based emulation for IEEE 802.11a baseband,” in Proc. IWSOC, Banff, Canada, July 2005.

40. Heejung Yu, Taehyun Jeon, and Sok-Kyu Lee, “Reduced search space scheme for detection of spatial division multiplexing,” in Proc. IEEE VTC, Stockholm, Sweden, May 2005.

41. Heejung Yu, Taehyun Jeon, and Sok-Kyu Lee, “Design of dual-band MIMO-OFDM system for next generation wireless LAN,” in Proc. IEEE ICC, Seoul, Korea, May 2005.

42. Heejung Yu, Myung-Soon Kim, Taehyun Jeon, and Sok-Kyu Lee, “Transmit antenna selection for MIMO systems with V-BLAST type detection,” in Proc. IEEE ISPACS, Seoul, Korea, Nov. 2004.

43. Heejung Yu, Myung-Soon Kim, Taehyun Jeon, and Sok-Kyu Lee, “Equalization scheme for OFDM systems in long delay spread channels,” in Proc. IEEE PIMRC, Barcelona, Spain, Sep. 2004.

44. Heejung Yu, Myung-Soon Kim, and Sok-Kyu Lee, “Channel estimation and equalization for high speed mobile OFDM systems,” in Proc. Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, Nov. 2003.

45. Heejung Yu, Myung-Soon Kim, and Jae-Young Ahn, “Carrier frequency and timing offset tracking scheme for SC-FDE systems,” in Proc. IEEE PIMRC, Beijing, China, Sep. 2003.

46. Jihoon Choi, Heejung Yu, and Yong H. Lee, “Adaptive MIMO decision feedback equalization for receivers in time-varying channels,” in Proc. IEEE VTC, Jeju, Korea, Apr. 2003.

47. Heejung Yu, Taehyun Joen, and Jae-Young Ahn, “Residual carrier and sampling frequency offset tracking in OFDM wireless LAN systems,” in Proc. CIC, Seoul, Korea, Nov. 2002.

48. Heejung Yu, Myung-Soon Kim and Jae-Young Ahn, “Frequency offset tracking scheme for SC-FDE systems,” in Proc. IST Mobile & Wireless Telecommunications Summit, Thessaloniki, Greece, June 2002.

International Patents (US registered patent only, searched by Google Scholar)

1. Yu, Heejung; Noh, Yujin; Oh, Jong-Ee; Ryu, Jaeyoung, "Frame exchange method for beamforming," 2024, US Patent 11,936,444

2. Lee, Jae Seung; Cheong, Mln Ho; Kwon, Hyoung Jin; Yu, Hee Jung; Park, Jae Woo; Lee, Sok Kyu Lee; "Method and apparatus for allocating flexible transmission slot in wireless LAN system," 2023, US Patent 11,729,715

3. Yu, Heejung; Cheong, Minho; Kwon, Hyoung Jin; "Frame trasnmitting method and frame receiving method," 2023, US Patent 11,677,598

4. Noh, Yujin; Yu, Heejung; Oh, Jong-Ee; Ryu, Jaeyoung; "Signaling method for multiplexing different amendment devices in an enhanced wireless local area network," 2023, US Patent 11,564,243  

5. Yu, Heejung; Noh, Yujin; Oh, Jong-Ee; Ryu, Jaeyoung; "Frame exchange method for beamforming," 2023, US Patent 11,546,023

6. Yu, Hee Jung; Cheong, Min Ho; Lee, Jae Seung; Kwon, Hyoung Jin; Lee, Sok Kyu; "OFDM transmission method and device in wireless LAN system," 2022, US Patent 11,463,293

7. Lee, Jae Seung; Kwon, Hyoung Jin; Cheong Min Ho; Yu, Hee Jung; Lee, Sok Kyu; “Method for changing operating mode of wireless LAN system and wireless LAN system,” 2022, US Patent 11,284,345

8. Lee, Jae Seung; Cheong; Min Ho; Kwon, Hyoung Jin; Yu, Hee Jung; Lee, Sok Kyu; "Scanning method in wireless LAN system and supporting device therefor," 2022, US Patent 11,218,953

9.  Kwon, Hyoung Jin;Lee, Jae Seung; Cheong; Min Ho; Yu, Hee Jung; Lee, Sok Kyu; "Method and terminal for requesting and acquiring information relating to channel access in wireless LAN, and apparatus for providing information relating to channel access in wireless LAN", 2022, US Patent 11,219,058

10. Lee, Jae Seung; Cheong, Mln Ho; Kwon, Hyoung Jin; Yu, Hee Jung; Park, Jae Woo; Lee, Sok Kyu Lee; "Method and apparatus for allocating flexible transmission slot in wireless LAN system," 2021, US Patent 11,184,847

11. Kwon, Hyoung Jin; Lee, Jae Seung; Cheong,  Min Ho; Yu, Hee Jung; Park, Jae Woo; Lee, Sok Kyu; "Apparatus and method for controlling slot usage," 2021, US Patent 11,172,518

12. Kwon, Hyoung Jin; Yu, Hee Jung; Lee, Sok Kyu; Lee, Jae Seung; Cheong, Min Ho; "Method and apparatus for controlling channel access in wireless local area network (WLAN) system," 2021, US Patent 11,032,846

13. Yu, Heejung; Cheong, Minho; Kwon, Hyoung Jin; "Frame transmitting method and frame receiving method," 2021, US Patent 10,944,593

14. Yu, Hee-Jung; Jeon, Taehyun; Kim, Myung-Soon; Choi, Eun-Young; Lee, Sok-Kyu; Lyu, Deuk-Su; "Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof," 2021, US Patent 10,932,155

15. Yu, Hee-Jung, Cheong, Min-Ho; Lee, Sok-Kyu; "Apparatus and method for transmitting/receiving data in communication system," 2020, US Patent 10,820,315

16. Yu, Hee Jung, Cheong, Min Ho; Lee, Jae Seung; Kwon, Hyoung Jin, Lee, Sok Kyu; "OFDM transmission method and device in wireless LAN system," 2020 US Patent 10,812,309

17. Kwon, Hyoung Jin; Lee, Jae Seung; Cheong, Min Ho; Yu, Hee Jung; Lee, Sok Kyu; “Device and method for controlling slot-based channel access in wireless LAN system, and slot-based channel access terminal in wireless LAN,” 2020, US Patent 10,779,318

18. Lee, Jae Seung; Kwon, Hyoung Jin; Cheong Min Ho; Yu, Hee Jung; Lee, Sok Kyu; “Method for changing operating mode of wireless LAN system and wireless LAN system,” 2020, US Patent 10,681,634

19. Kwon, Hyoung Jin; Lee, Jae Seung; Cheong, Min Ho; Yu, Hee Jung; Park,Jae Woo; Lee,Sok Kyu; "Apparatus and method for controlling slot usage," 2020, US Patent 10,624,135

20. Kwon, Hyoung Jin; Lee; Jae Seung; Cheong; Min Ho; Yu, Hee Jung; Lee, Sok Kyu; "Method and terminal for requesting and acquiring information relating to channel access in wireless LAN, and apparatus for providing information relating to channel access in wireless LAN," 2020, US Patent 10,555,336

21. Noh, Yujin; Lee,Dae Won; Moon, Sungho; Ahn, Jae Hyun, Yu, Hee Jung; Cheong, Minho, "Support of frequency diversity mode for block code based transmission in OFDMA," 2019, US Patent 10,523,483

22. Kwon, Hyoung Jin; Yu, Hee Jung; Lee, Sok Kyu; Lee, Jae Seung; Cheong, Min Ho; “Method and apparatus for controlling channel access in wireless local area network (WLAN) system,” 2019, US Patent 10,462,817

23. Kwon, Hyoung Jin; Lee, Jae Seung; Cheong, Min Ho; Yu, Hee Jung; Lee, Sok Kyu; “Device and method for controlling slot-based channel access in wireless LAN system, and slot-based channel access terminal in wireless LAN,” 2019, US Patent 10,356,810

24. Yu, Hee Jung; Cheong, Min Ho; Lee, Jae Seung; Kwon, Hyoung Jin; Lee, Sok Kyu; “Communication method and communication device in wireless LAN system that supports multi-bandwidth,” 2019, US Patent 10,462,791

25. Yu, Heejung; Cheong, Minho; Kwon, Hyoung Jin; “Frame transmitting method and frame receiving method,” 2019, US Patent 10,326,618

26. Lee, Jae Seung; CHEONG, Min Ho; Kwon, Hyoung Jin; YU, Hee Jung; Lee, Sok Kyu; ”Scanning method in wireless LAN system and supporting device therefor,” 2019, US Patent 10,225,792

27. Yu, Hee-Jung; Jeon, Taehyun; Kim, Myung-Soon; Choi, Eun-Young; Lee, Sok-Kyu; Lyu, Deuk-Su; “Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof,” 2019, US Patent 10,313,927

28. Lee, Jae Seung; Kwon, Hyoung Jin; Cheong, Min Ho; Yu, Hee Jung; Lee, Sok Kyu; “Method for changing operating mode of wireless LAN system and wireless LAN system,” 2018, US Patent 9,860,837

29. Yu, Hee Jung; Cheong, Min Ho; Lee, Jae Seung; Kwon, Hyoung Jin; Lee, Sok Kyu; “OFDM transmission method and device in wireless LAN system,” 2018 US Patent 9,912,509

30. Yu, Hee Jung; Lee, Sok Kyu; Lee, Hee Soo; Cheong, Min Ho; “Access point apparatus for configuring next generation wireless communication network and method of operating the access point apparatus,” 2018 US Patent 9,986,570

31. Yu, Heejung; Lee, Daewon; Kwon, Young Hoon; Moon, Sungho; Noh, Yujin; “Method for transmitting and receiving frame, and wireless device implementing the same method,” 2018 US Patent 9,860,349

32. Noh, Yujin; Lee, Dae Won; Moon, Sungho; Ahn, Jae Hyun; Yu, Hee Jung; Cheong, Minho; “Support of frequency diversity mode for block code based transmission in OFDMA,” 2018 US Patent 9,860,099

33. Lee, Jae Seung; Cheong, Min Ho; Kwon, Hyoung Jin; Yu, Hee Jung; Lee, Sok Kyu; “Scanning method in wireless LAN system and supporting device therefor,” 2017 US Patent 9,749,936

34. Yongjin, KWON; Oh, Jong-Ee; Park, Hyungu; Lee, Je-Hun; Kim, Hong Soog; Yu, Heejung; Cheong, Minho; Kwon, Hyoung Jin; “Acknowledgement method and multi user transmission method,” 2017 US Patent 9,825,738

35. Kwon, Hyoung Jin; Cheong, Min Ho; Yu, Hee Jung; “Operation method of station in wireless local area network,” 2017 US Patent 9,769,746

36. Yu, Heejung; “Frame transmitting method and frame receiving method,” 2017 US Patent 9,553,699

37. Kwon, Hyoung Jin; Lee, Jae Seung; Cheong, Min Ho; Yu, Hee Jung; Park, Jae Woo; Lee, Sok Kyu; “Apparatus and method for controlling slot usage,” 2017 US Patent 9,807,804

38. Yu, Heejung; Cheong, Minho; Kwon, Hyoungjin; “Wireless local area network communications with varying subcarrier spacings,” 2017 US Patent 9,647,816

39. Yu, Hee-Jung; Cheong, Min-Ho; Lee, Sok-Kyu; “Apparatus and method for transmitting/receiving data in communication system,” 2016 US Patent 9,277,555

40. Cheong, Min Ho; Yu, Hee Jung; Lee, Sok Kyu; Bang, Seung Chan; “Apparatus and method for extending coverage in wireless communication system,” 2016 US Patent 9,338,660

41. Yu, Hee Jung; Lee, Sok Kyu; Lee, Hee Soo; Cheong, Min Ho; “Access point apparatus for configuring next generation wireless communication network and method of operating the access point apparatus,” 2016 US Patent 9,264,909

42. Kwon, Hyoung Jin; Lee, Jae Seung; Cheong, Min Ho; Yu, Hee Jung; Lee, Sok Kyu; “Apparatus and method for controlling transmission schedule for buffered data in wireless LAN, and terminal for receiving buffered data based on transmission schedule in wireless LAN,” 2016 US Patent 9,516,592

43. Yu, Hee Jung; Cheong, Min Ho; Lee, Jae Seung; Kwon, Hyoung Jin; Lee, Sok Kyu; “OFDM transmission method and device in wireless LAN system,” 2016 US Patent 9,264,274

44. Oh, Jong-Ee; Yu, Hee-Jung; Lee, Yu-Ro; Choi, In-Kyeong; Lee, Sok-Kyu; “Apparatus and method for receiving data in communication system,” 2015 US Patent 9,042,473

45. Yu, Heejung; Lee, Il Gu; Kang, Hun Sik; Lee, Sok Kyu; “Method and apparatus for transmitting relay frame in wireless communication system,” 2015 US Patent 9,226,323

46. Lee, Il Gu; Yu, Heejung; Kang, Hun Sik; Lee, Sok Kyu; “Method and apparatus for transmitting symbol repeatedly in wireless communication system,” 2015 US Patent 9,001,929

47. Hong, Young Jun; Kwon, Tae Soo; Shin, Chang Yong; Jang, Kyung Hun; Yu, Hee Jung; Kim, Hak Soo; Lee, Yong Hoon; Sung, Young Chul; “Communication system of detecting victim terminal and performing interference coordination in multi-cell environments,” 2014 US Patent 8,737,921

48. Yu, Heejung; Lee, Il Gu; Cheong, Min Ho; Kang, Hun Sik; Lee, Sok Kyu; “Method for generating and transmitting frame in a wireless local area network and apparatus for supporting the same,” 2014 US Patent 8,774,222

49. Cheong, Min-Ho; Yu, Hee-Jung; Lee, Sok-Kyu; “Apparatus and method for allocating resource in communication system,” 2014 US Patent 8,861,470

50. Yoon, Chan-Ho; Oh, Jong-Ee; Cheong, Min-Ho; Lee, Yu-Ro; Lee, Sok-Kyu; Yu, Hee-Jung; Bang, Seung-Chan; “Method for encoding low density parity check codes using result of checking previously specified parity bits,” 2013 US Patent 8,392,792

51. Cho, Dong Ho; Yu, Hee Jung; Oh, Young Seok; Lee, Ho Won; Lee, Woong Sup; Lee, Yong Hoon; “Relay communication method of next generation cellular communication system,” 2013 US Patent 8,472,869

52. Kwon, Tae Soo; Kim, Young-Doo; Kim, Eung Sun; Lee, Yong Hoon; Chung, Sae-Young; Yu, Heejung; Shin, Won-Yong; “Method for setting packet transmission path in ad hoc network, and network apparatus using the same,” 2013 US Patent 8,411,611

53. Lee, Yu-Ro; Cheong, Min-Ho; Yu, Hee-Jung; Oh, Jong-Ee; Yoon, Chan-Ho; Kim, Young-Gyun; Lee, Sok-Kyu; Bang, Seung-Chan; “Apparatus for receiving signals in OFDM communication system having multiple antennas and method thereof         ,” 2012 US Patent 8,223,876

54. Kwon, Tae Soo; Lee, In Sun; Hwang, Hyo Sun; Kim, Youngsoo; Choi, Hyun Ho; Lee, Young Hoon; Sung, Young Chul; Yu, Hee Jung; Oh, Young Seok; “Pilot signal power control apparatus and operation method of pilot signal power control apparatus,” 2012 US Patent 8,099,051

55. Kwon, Tae Soo; Yu, Hee Jung; Jang, Kyung Hun; Sung, Young Chul; Hwang, Hyo Sun; Lee, Yong Hoon; Oh, Young Seok; “Apparatus and method for radio communication,” 2012 US Patent 8,103,217

56. Yu, Heejung; Jeon, Taehyun; Kim, Myung-Soon; Choi, Eun-Young; Lee, Sok-Kyu; Lyu, Deuk-Su;           “Residual frequency, phase, timing offset and signal amplitude variation tracking apparatus and methods for OFDM systems,” 2011 US Patent 7,916,797

57. Lee, Il-Gu; Lee, Sok-Kyu; Yu, Hee-Jung; Choi, Eun-Young; Yoon, Chan-Ho; Son, Jung-Bo; Lyu, Deuk-Su; Min, Seung-Wook; Jeon, Tae-Hyun; Bang, Seung-Chan; “Automatic gain control device having variable gain control interval and method thereof,” 2010 US Patent 7,676,208

58. Yu, Hee-Jung; Choi, Eun-Young; Yoon, Chan-Ho; Son, Jung-Bo; Lee, Il-Gu; Lyu, Deuk-Su; Jeon, Tae-Hyun; Min, Seung-Wook; Lee, Sok-Kyu; Bang, Seung-Chan; “Transmitting and receiving systems for increasing service coverage in orthogonal frequency division multiplexing wireless local area network, and method thereof,” 2010 US Patent 7,839,760

59. Son, Jung-Bo; Yu, Hee-Jung; Choi, Eun-Young; Yoon, Chan-Ho; Lee, Il-Gu; Lyu, Deuk-Su; Jeon, Tae-Hyun; Min, Seung-Wook; Ryu, Kwhang-Hyun; Noh, Kyoung-Ju; “Method for digital system modeling by using higher software simulator,” 2010 US Patent 7,783,467

60. Yu, Hee-Jung; Jeon, Taehyun; Kim, Myung-Soon; Choi, Eun-Young; Lee, Sok-Kyu; Lyu, Deuk-Su; “Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof,” 2010 US Patent 7,782,968

61. Yu, Hee-Jung; Lee, Hee-Soo; Lee, Sok-Kyu;           “Spatial multiplexing detection system and method for MIMO,” 2009 US Patent 7,519,022

62. Yu, Hee-Jung; Jeon, Taehyun; Kim, Myung-Soon; Choi, Eun-Young; Lee, Sok-Kyu; Lyu, Deuk-Su; “Apparatus for transmitting and receiving data to provide high-speed data communication and method thereof,” 2009 US Patent 7,535,968

63. Yu, Heejung; Jeon, Taehyun; Kim, Myung-Soon; Choi, Eun-Young; Lee, Sok-Kyu; Lyu, Deuk-Su; “Method for detecting signal in multiple input multiple output system and receiving device of multiple input multiple output system,” 2009 US Patent 7,590,201

64. Jeon, Taehyun; Yu, Heejung; Kim, Myung-Soon; Choi, Eun-Young; Lee, Sok-Kyu; Lyu, Deuk-Su; “Method for detecting symbol synchronization and apparatus thereof        ,” 2009 US Patent 7,577,168

65. Kim, Young-Doo; Kim, Inhyoung; Yu, Heejung; Choi, Jihoon; Jeon, Taehyun; Ahn, Jae-Young; Lee, Yong-hoon; “Apparatus and method for adaptively modulating signal by using layered time-space detector used in mimo system,” 2008 US Patent 7,453,947

66. Yu, Hee-Jung; Choi, Ji-Hoon; Lee, Yong-hoon; “Adaptive receiving system and method for MIMO,” 2008 US Patent 7,346,104

67. Yu, Heejung; Jeon, Taehyun; Kim, Myung-Soon; Choi, Eun-Young; Lee, Sok-Kyu; Lyu, Deuk-Su;           Automatic gain control method in wireless packet communication system,” 2008 US Patent 7,403,757

68. Yu, Hee-Jung; Ahn, Jae-Young; “Apparatus and method for tracking residual frequency offset for single carrier-frequency domain equalizer system,” 2007 US Patent 7,308,033

69. Jeon, Taehyun; Lim, Hyoung-Soo; Yu, Hee-Jung; Ahn, Jae-Young; “Method and device for tracking carrier frequency offset and sampling frequency offset in orthogonal frequency division multiplexing wireless communication system,” 2007 US Patent 7,308,034