Zhi Quan

116 papers B 5C 4Misc 6Journal 81Unranked 20
YearRankTypeTitle / Venue / Authors
2026 J jnl
Collaborative Access With Waiting Window: Enhancing Age-of-Information in CSMA Networks.
IEEE Trans. Mob. Comput.
Yifan Gu, Suzhi Bi, Zhaoxu Wang, Zhi Quan
2025 J jnl
A CIMS-based decision support system for e-commerce: boosting real-time and effective digital marketing.
J. Supercomput.
Luoxi Pu, Zhi Quan
2025 J jnl
A lightweight optimization framework for real-time object detector on the embedded GPU platform.
Signal Image Video Process.
Jiawei Zhu, Haogang Feng, Shida Zhong, Zhi Quan, Tao Yuan
2025 J jnl
Adaptive Sampling for Age of Information in Non-Stationary Network Traffic.
IEEE Trans. Mob. Comput.
Yifan Gu, Zhi Quan
2025 J jnl
Composite Multiple-Mode Virtual Spatial Modulation and Its Generalization for Wireless Communication Systems.
IEEE Trans. Wirel. Commun.
Zahid Iqbal, Jun Li, Yifan Gu, Dayang Liu, Zhi Quan
2025 B conf
Differentiated AoI Guaranteed Sampling for Non-Stationary Multi-Modal Sensing Systems.
GLOBECOM
Yifan Gu, Jianhua Li, Zhi Quan
2025 J jnl
Federated Reinforcement Learning in Stock Trading Execution: The FPPO Algorithm for Information Security.
IEEE Access
Haogang Feng, Yue Wang, Shida Zhong, Tao Yuan, Zhi Quan
2025 J jnl
Improved Target Localization With Off-Grid Compressed Sensing for Multistatic MIMO-OFDM Signals.
IEEE Internet Things J.
Xiaoyong Lyu, Dongfang Luo, Yu He, Baojin Liu, Wenbing Fan, Zhi Quan
2025 C conf
Latency-Guaranteed Adaptive Bitrate Scheme for Industrial Video Analytics Applications.
INDIN
Yifan Gu, Lehongfei Li, Jianhua Li, Zhi Quan
2025 B conf
Matched Filtering Based OFDM-ISAC for Reduced-Complexity Collaborative UAV Detection.
GLOBECOM
Yifan Lei, Suzhi Bi, Zhenyu Xiao, Xiaohui Lin, Zhi Quan
2025 — conf
Online Trajectory and Resource Optimization for UAV-Enabled Wideband ISAC Service.
ICC
Zhanye Chen, Suzhi Bi, Xiaohui Lin, Zhi Quan, Ying-Jun Angela Zhang
2025 J jnl
Scalable Multi-Task Edge Sensing via Task-Oriented Joint Information Gathering and Broadcast.
IEEE Trans. Wirel. Commun.
Huawei Hou, Suzhi Bi, Xian Li, Shuoyao Wang, Li Ping Qian, Zhi Quan
2025 J jnl
Transferable Deployment of Semantic Edge Inference Systems via Unsupervised Domain Adaption.
CoRR
Weiqiang Jiao, Suzhi Bi, Xian Li, Cheng Guo, Hao Chen, Zhi Quan
2025 J jnl
Transferable Deployment of Semantic Edge Inference Systems via Unsupervised Domain Adaption.
IEEE Internet Things J.
Weiqiang Jiao, Suzhi Bi, Xian Li, Cheng Guo, Hao Chen, Zhi Quan
2024 — conf
A Bayesian Optimization Approach for Online System Configuration of Edge Video Analytics.
WCSP
Haowen Tang, Suzhi Bi, Shuoyao Wang, Xiaohui Lin, Yifan Gu, Zhi Quan
2024 J jnl
A Lightweight Authentication Protocol Against Modeling Attacks Based on a Novel LFSR-APUF.
IEEE Internet Things J.
Yao Wang, Xue Mei, Zhengtai Chang, Wenbing Fan, Benqing Guo, Zhi Quan, Deepak Kumar Jain
2024 J jnl
Analysis of the channel estimate model in passive radar using OFDM waveforms.
Digit. Signal Process.
Xiaoyong Lyu, Baojin Liu, Wenbing Fan, Zhi Quan
2024 J jnl
Capacity Analysis and Throughput Maximization of NOMA With Non-Linear Power Amplifier Distortion.
IEEE Trans. Wirel. Commun.
Xiaojia Wang, Suzhi Bi, Xian Li, Xiaohui Lin, Zhi Quan, Ying-Jun Angela Zhang
2024 J jnl
Deep-learning-aided fast successive cancellation decoding of polar codes.
J. Commun. Networks
Haogang Feng, Haiyu Xiao, Shida Zhong, Zhuqing Gao, Tao Yuan, Zhi Quan
2024 J jnl
Distinctive mobile learning: where it is different and how it can make a difference.
Interact. Learn. Environ.
Zhi Quan, Lynn Grant, Darryl Hocking, Andy Connor
2024 J jnl
For better and quicker understanding of how users feel: an optimized sentiment classification model for long comments on social networks.
Multim. Tools Appl.
Zhi Quan, Luoxi Pu
2024 J jnl
Graph Neural Network for Distributed Beamforming and Power Control in Massive URLLC Networks.
IEEE Trans. Wirel. Commun.
Yifan Gu, Changyang She, Suzhi Bi, Zhi Quan, Branka Vucetic
2024 J jnl
Investigating How Chinese E-Commerce SMEs Would Adopt AI Live-Streaming via a Dual Analysis: Trendy and Transformative.
J. Organ. End User Comput.
Luoxi Pu, Robert I. Radics, Muhammad Umar, Zhi Quan
2024 J jnl
LAGER: Label-Free Domain-Adaptive Wireless Gesture Recognition via Latent Feature Alignment and Augmentation.
IEEE Internet Things J.
Jin Chen, Suzhi Bi, Xiaohui Lin, Zhi Quan
2024 J jnl
Simulation-Enhanced MQAM Modulation Identification in Communication Systems: A Subtractive Clustering-Based PSO-FCM Algorithm Study.
Inf.
Zhi Quan, Hailong Zhang, Jiyu Luo, Haijun Sun
2024 J jnl
TDOA-Based Indoor Localization via Linear Fusion With Low-Rank Matrix Approximation.
IEEE Internet Things J.
Haibin Li, Osama Elnahas, Zhi Quan
2023 J jnl
A Lightweight Authentication Protocol against Modeling Attacks based on a Novel LFSR-APUF.
CoRR
Yao Wang, Xue Mei, Zhengtai Chang, Wenbing Fan, Benqing Guo, Zhi Quan
2023 J jnl
An improved accurate classification method for online education resources based on support vector machine (SVM): Algorithm and experiment.
Educ. Inf. Technol.
Zhi Quan, Luoxi Pu
2023 J jnl
Capacity Analysis and Throughput Maximization of NOMA with Nonlinear Power Amplifier Distortion.
CoRR
Xiaojia Wang, Suzhi Bi, Xian Li, Xiaohui Lin, Zhi Quan, Ying-Jun Angela Zhang
2023 — conf
Capacity Region of Two-User Uplink NOMA with Nonlinear Power Amplifier Distortion.
ICC
Xiaojia Wang, Suzhi Bi, Xian Li, Zheyuan Yang, Xiao-Hui Lin, Zhi Quan, Ying-Jun Angela Zhang
2023 J jnl
DASECount: Domain-Agnostic Sample-Efficient Wireless Indoor Crowd Counting via Few-Shot Learning.
IEEE Internet Things J.
Huawei Hou, Suzhi Bi, Lili Zheng, Xiaohui Lin, Yuan Wu, Zhi Quan
2023 J jnl
Data-Driven Spectrum Allocation and Power Control for NOMA HetNets.
IEEE Trans. Veh. Technol.
Ahmed Nasser, Osama Elnahas, Osamu Muta, Zhi Quan
2023 J jnl
Digital Twins Based Intelligent State Prediction Method for Maneuvering-Target Tracking.
IEEE J. Sel. Areas Commun.
Jingxian Liu, Junjie Yan, Dehuan Wan, Xuran Li, Saba Al-Rubaye, Anwer Al-Dulaimi, Zhi Quan
2023 J jnl
Efficient Massive MIMO Detection for M-QAM Symbols.
Entropy
Zhi Quan, Jiyu Luo, Hailong Zhang, Li Jiang
2023 J jnl
Graph Neural Networks for Distributed Power Allocation in Wireless Networks: Aggregation Over-the-Air.
IEEE Trans. Wirel. Commun.
Yifan Gu, Changyang She, Zhi Quan, Chen Qiu, Xiaodong Xu
2023 J jnl
ResMon: Domain-Adaptive Wireless Respiration State Monitoring via Few-Shot Bayesian Deep Learning.
IEEE Internet Things J.
Lili Zheng, Suzhi Bi, Shuoyao Wang, Zhi Quan, Xian Li, Xiaohui Lin, Hui Wang
2023 J jnl
Robust Beamforming Design for Dual-Function Radar-Communication System.
IEEE Trans. Veh. Technol.
Bin Liao, Xue Xiong, Zhi Quan
2023 J jnl
Robust DOA Estimation Using VSS-LMS With Low-Rank Matrix Approximation.
IEEE Trans. Aerosp. Electron. Syst.
Babur Jalal, Osama Elnahas, Xiaodong Xu, Zhi Quan, Ping Zhang
2022 J jnl
A multipermutation superposition coding-based fragile watermarking for probabilistic encryption.
Multim. Tools Appl.
Li Jiang, Hao Zheng, Haoyuan Wang, Zhi Quan
2022 J jnl
Correction to: A multipermutation superposition coding-based fragile watermarking for probabilistic encryption.
Multim. Tools Appl.
Li Jiang, Hao Zheng, Haoyuan Wang, Zhi Quan
2022 J jnl
Data-Driven Bandpass Filter Design for Estimating Symbol Rate of Sporadic Signal at Low SNR.
IEEE Trans. Wirel. Commun.
Can Pei, Suzhi Bi, Zhi Quan
2022 J jnl
Data-Driven Hybrid Beamforming for Uplink Multi-User MIMO in Mobile Millimeter-Wave Systems.
IEEE Trans. Wirel. Commun.
Yuan Ma, Silei Ren, Zhi Quan, Zhiyong Feng
2022 J jnl
Efficient DOA Estimation Under Partially Impaired Antenna Array Elements.
IEEE Trans. Veh. Technol.
Babur Jalal, Osama Elnahas, Zhi Quan
2022 J jnl
Joint ML/MAP Estimation of the Frequency and Phase of a Single Sinusoid With Wiener Carrier Phase Noise.
IEEE Trans. Signal Process.
Qian Wang, Zhi Quan, Suzhi Bi, Pooi-Yuen Kam
2022 J jnl
Online Cognitive Data Sensing and Processing Optimization in Energy-Harvesting Edge Computing Systems.
IEEE Trans. Wirel. Commun.
Xian Li, Suzhi Bi, Zhi Quan, Hui Wang
2022 — conf
Sample-Efficient Cross-Domain WiFi Indoor Crowd Counting via Few-shot Learning.
WOCC
Huawei Hou, Suzhi Bi, Lili Zheng, Xiaohui Lin, Zhi Quan
2022 J jnl
Theory and techniques for "intellicise" wireless networks.
Frontiers Inf. Technol. Electron. Eng.
Ping Zhang, Mugen Peng, Shuguang Cui, Zhaoyang Zhang, Guoqiang Mao, Zhi Quan, Tony Q. S. Quek, Bo Rong
2022 J jnl
Transmit waveform and receive filter design for multiple-input multiple-output radar with one-bit digital-to-analogue converters.
IET Signal Process.
Huan Wan, Zhi Quan, Bin Liao
2021 J jnl
Cognitive radio networks for green wireless communications: an overview.
Telecommun. Syst.
Arash Ostovar, Hengameh Keshavarz, Zhi Quan
2021 J jnl
Data-Driven Beam Tracking for Mobile Millimeter-Wave Communication Systems Without Channel Estimation.
IEEE Wirel. Commun. Lett.
Yuan Ma, Silei Ren, Wei Chen, Zhi Quan
2021 J jnl
Generalized Mutual Information Analysis for BICM-8QAM With Residual Phase Noise.
IEEE Commun. Lett.
Qian Wang, Zhi Quan, Suzhi Bi, Changyuan Yu, Pooi-Yuen Kam
2021 J jnl
Joint Radar and Communication: A Survey.
CoRR
Zhiyong Feng, Zixi Fang, Zhiqing Wei, Xu Chen, Zhi Quan, Danna Ji
2021 J jnl
Online Cognitive Data Sensing and Processing Optimization in Energy-harvesting Edge Computing Systems.
CoRR
Xian Li, Suzhi Bi, Zhi Quan, Hui Wang
2020 J jnl
A Programmable Frequency Divider With a Full Modulus Range and 50% Output Duty Cycle.
IEEE Access
Yao Wang, Yanqi Wang, Zhaolei Wu, Zhi Quan, Juin Jei Liou
2020 J jnl
Clock Synchronization in Wireless Networks Using Matrix Completion-Based Maximum Likelihood Estimation.
IEEE Trans. Wirel. Commun.
Osama Elnahas, Yuan Ma, Yi Jiang, Zhi Quan
2020 J jnl
Data-Driven RF Transmit Power Calibration for Wireless Communication Systems.
IEEE Wirel. Commun. Lett.
Lianghui Xie, Osama Elnahas, Qinglin Zhao, Zhi Quan
2020 J jnl
Efficient Detection for Large-Scale MIMO Systems Using Dichotomous Coordinate Descent Iterations.
IEICE Trans. Commun.
Zhi Quan, Shuhua Lv, Li Jiang
2020 J jnl
Improved Convergence Speed of a DCD-Based Algorithm for Sparse Solutions.
Algorithms
Zhi Quan, Shuhua Lv
2020 J jnl
Intelligent Reflecting Surface Enhanced User Cooperation in Wireless Powered Communication Networks.
IEEE Wirel. Commun. Lett.
Yuan Zheng, Suzhi Bi, Ying Jun Zhang, Zhi Quan, Hui Wang
2020 J jnl
M-APSK Constellation Optimization in the Presence of Phase Reference Error.
IEEE Wirel. Commun. Lett.
Qian Wang, Zhi Quan, Tianyu Song, Mingwei Wu, Yan Li, Pooi-Yuen Kam
2020 J jnl
Optimal Linear Cooperation for Signal Classification in Cognitive Communication Networks.
IEEE Trans. Wirel. Commun.
Yuan Ma, Zhi Quan, Dong Li, Sha Zhang, Xiaofan Li, Zhiyong Feng, Zhi Ding
2020 J jnl
Quasi-Elliptic Bandpass Frequency Selective Surface Based on Coupled Stubs-Loaded Ring Resonators.
IEEE Access
Rui-Xiang Liao, Sai-Wai Wong, Yin Li, Jing-Yu Lin, Bai-Yang Liu, Fu-Chang Chen, Zhi Quan
2019 J jnl
1-bit compressive sensing with an improved algorithm based on fixed-point continuation.
Signal Process.
Peng Xiao, Bin Liao, Xiaodong Huang, Zhi Quan
2019 J jnl
Data-Driven Measurement of Receiver Sensitivity in Wireless Communication Systems.
IEEE Trans. Commun.
Yuan Ma, Xu Wang, Zhi Quan, H. Vincent Poor
2019 — conf
Fast Data-Driven Sensitivity Measurement for Wireless Receivers.
ICC
Xu Wang, Zhi Quan
2019 J jnl
Minimizing Misclassification for Cooperative Spectrum Sensing Using $M$-Ary Hypothesis Testing.
IEEE Trans. Veh. Technol.
Yuan Ma, Zhi Quan, Dong Li, Bojun Zhang
2019 J jnl
On the Outage Probability and Power Control of D2D Underlaying NOMA UAV-Assisted Networks.
IEEE Access
Mahmoud M. Selim, Mohamed Rihan, Yatao Yang, Lei Huang, Zhi Quan, Junxian Ma
2018 J jnl
DCD-Based Branch and Bound Detector with Reduced Complexity for MIMO Systems.
IEICE Trans. Commun.
Zhi Quan, Ting Tian
2018 — conf
Online Mutual Coupling Calibration Using a Signal Source at Unknown Location.
SAM
Tong Wei, Bin Liao, Huiping Huang, Zhi Quan
2017 J jnl
Efficient complex matrix inversion for MIMO OFDM systems.
J. Commun. Networks
Zhi Quan, Jie Liu
2017 J jnl
Joint Power Allocation and Splitting (JoPAS) for SWIPT in Doubly Selective Vehicular Channels.
IEEE Trans. Green Commun. Netw.
Dexin Wang, Rongqing Zhang, Xiang Cheng, Zhi Quan, Liuqing Yang
2017 — conf
Robust beamforming against direction-of-arrival mismatch via signal-to-interference-plus-noise ratio maximization.
WCSP
Huan Wan, Huiping Huang, Bin Liao, Zhi Quan
2016 J jnl
A Diplexer-Based Receiver for Simultaneous Wireless Information and Power Transfer.
CoRR
Chong Qin, Yi Gong, Zhi Quan
2016 — conf
A fast receiver sensitivity identification method for wireless systems.
ICC
Zhi Quan, Minghe Zhu, Shuguang Cui
2016 Misc conf
A novel diplexer-based receiver for simultaneous wireless information and power transfer.
ICCS
Chong Qin, Yi Gong, Zhi Quan
2016 — conf
Cooperative signal classification using spectral correlation function in cognitive radio networks.
ICC
Zhi Quan, Dong Li, Yi Gong
2016 Misc conf
Energy efficient video QoE optimization for dynamic adaptive HTTP streaming over wireless networks.
ICCS
Liqiang Tao, Yi Gong, Shi Jin, Zhi Quan
2016 Misc conf
High precision RF transmit power calibration based on recursive least squares estimation.
ICCS
Xin Chen, Yi Gong, Xiaohuan Lin, Zhi Quan
2016 Misc conf
Optimal linear cooperation for signal classification.
ICASSP
Zhi Quan, Muyang Ye, Zhi Ding, Shuguang Cui
2015 C conf
Adaptive multi-band resource allocation for wireless power and information transmission.
ICCC
Zidong Han, Yue Zhang, Yi Gong, Zhi Quan
2015 J jnl
FPGA Resource Efficient M-PSK Detector for Large MIMO and Multiuser Systems.
Circuits Syst. Signal Process.
Zhi Quan, Jie Liu, Yuriy V. Zakharov
2014 J jnl
Clustered-orthogonal frequency division multiplexing for power line communication: when is it beneficial?
IET Commun.
Moisés Vidal Ribeiro, Guilherme R. Colen, Fabrício P. V. de Campos, Zhi Quan, H. Vincent Poor
2014 J jnl
Multi-morphology transition hybridization CAD design of minimal surface porous structures for use in tissue engineering.
Comput. Aided Des.
Nan Yang, Zhi Quan, Dawei Zhang, Yanling Tian
2011 C conf
DCD-based simplified matrix inversion for MIMO-OFDM.
ISCAS
Zhi Quan, Yuriy V. Zakharov, Jie Liu
2011 J jnl
Optimal Spectral Feature Detection for Spectrum Sensing at Very Low SNR.
IEEE Trans. Commun.
Zhi Quan, Wenyi Zhang, Stephen J. Shellhammer, Ali H. Sayed
2010 J jnl
Frequency-domain correlation: an asymptotically optimum approximation of quadratic likelihood ratio detectors.
IEEE Trans. Signal Process.
Wenyi Zhang, H. Vincent Poor, Zhi Quan
2010 J jnl
Optimal linear fusion for distributed detection via semidefinite programming.
IEEE Trans. Signal Process.
Zhi Quan, Wing-Kin Ma, Shuguang Cui, Ali H. Sayed
2009 — conf
FPGA Design of Box-Constrained MIMO Detector.
ICC
Zhi Quan, Jie Liu, Yuriy V. Zakharov
2009 J jnl
Innovations Diffusion: A Spatial Sampling Scheme for Distributed Estimation and Detection.
IEEE Trans. Signal Process.
Zhi Quan, William J. Kaiser, Ali H. Sayed
2009 J jnl
Optimal Multiband Joint Detection for Spectrum Sensing in Cognitive Radio Networks.
IEEE Trans. Signal Process.
Zhi Quan, Shuguang Cui, Ali H. Sayed, H. Vincent Poor
2009 Misc conf
Optimal linear fusion for distributed spectrum sensing via semidefinite programming.
ICASSP
Zhi Quan, Wing-Kin Ma, Shuguang Cui, Ali H. Sayed
2009 B conf
Spectrum Sensing by Cognitive Radios at Very Low SNR.
GLOBECOM
Zhi Quan, Stephen J. Shellhammer, Wenyi Zhang, Ali H. Sayed
2009 J jnl
Spectrum sensing by cognitive radios at very low SNR
CoRR
Zhi Quan, Stephen J. Shellhammer, Wenyi Zhang, Ali H. Sayed
2008 J jnl
Collaborative wideband sensing for cognitive radios.
IEEE Signal Process. Mag.
Zhi Quan, Shuguang Cui, H. Vincent Poor, Ali H. Sayed
2008 — conf
Multiple phase decoder for MIMO systems.
ACSCC
Zhi Quan, Yuriy V. Zakharov, Junruo Zhang
2008 J jnl
Optimal Linear Cooperation for Spectrum Sensing in Cognitive Radio Networks.
IEEE J. Sel. Top. Signal Process.
Zhi Quan, Shuguang Cui, Ali H. Sayed
2008 J jnl
Spatial-Spectral Joint Detection for Wideband Spectrum Sensing in Cognitive Radio Networks
CoRR
Zhi Quan, Shuguang Cui, Ali H. Sayed, H. Vincent Poor
2008 Misc conf
Spatial-spectral joint detection for wideband spectrum sensing in cognitive radio networks.
ICASSP
Zhi Quan, Shuguang Cui, Ali H. Sayed, H. Vincent Poor
2008 J jnl
Wideband Spectrum Sensing in Cognitive Radio Networks
CoRR
Zhi Quan, Shuguang Cui, Ali H. Sayed, H. Vincent Poor
2008 — conf
Wideband Spectrum Sensing in Cognitive Radio Networks.
ICC
Zhi Quan, Shuguang Cui, Ali H. Sayed, H. Vincent Poor
2007 — conf
A spatial sampling scheme based on innovations diffusion in sensor networks.
IPSN
Zhi Quan, William J. Kaiser, Ali H. Sayed
2007 B conf
An Optimal Strategy for Cooperative Spectrum Sensing in Cognitive Radio Networks.
GLOBECOM
Zhi Quan, Shuguang Cui, Ali H. Sayed
2007 — conf
FPGA Implementation of DCD Based CDMA Multiuser Detector.
DSP
Zhi Quan, Jie Liu, Yuriy Zakharov
2007 — conf
Innovations-Based Sampling Over Spatially-Correlated Sensors.
ICASSP (3)
Zhi Quan, Ali H. Sayed
2007 — conf
Parallel FPGA Implementation of DCD Algorithm.
DSP
Jie Liu, Zhi Quan, Yuriy Zakharov
2007 J jnl
REACA: An Efficient Protocol Architecture for Large Scale Sensor Networks (Corrected).
IEEE Trans. Wirel. Commun.
Zhi Quan, Ananth Subramanian, Ali H. Sayed
2007 J jnl
REACA: An Efficient Protocol Architecture for Large Scale Sensor Networks.
IEEE Trans. Wirel. Commun.
Zhi Quan, Ananth Subramanian, Ali H. Sayed
2006 — conf
On the Performance of Clustered Energy-Aware Wireless Networks.
ICASSP (4)
Zhi Quan, Ananth Subramanian, Ali H. Sayed
2005 J jnl
Statistical admission control for real-time services under earliest deadline first scheduling.
Comput. Networks
Zhi Quan, Jong-Moon Chung
2004 C conf
Admission control for probabilistic services with earliest deadline first scheduling.
LANMAN
Zhi Quan, Jong-Moon Chung
2004 — conf
An analytical framework for EDF schedulers based on the dominant time scale.
CCNC
Zhi Quan, Jong-Moon Chung
2004 B conf
Analysis of packet loss for real-time traffic in wireless mobile networks with ARQ feedback.
WCNC
Zhi Quan, Jong-Moon Chung
2004 J jnl
Asymptotic loss of real-time traffic in wireless mobile networks with selective-repeat ARQ.
IEEE Commun. Lett.
Zhi Quan, Jong-Moon Chung
2004 — conf
Web-based Agricultural Support Systems.
Workshop on Web-based Support Systems
Yuegao Hu, Zhi Quan, Yiyu Yao
2003 J jnl
A statistical framework for EDF scheduling.
IEEE Commun. Lett.
Zhi Quan, Jong-Moon Chung
2003 — conf
Priority queueing analysis of self-similar in high-speed networks.
ICC
Zhi Quan, Jong-Moon Chung