Weixiong Rao - RankMe

115 papers A* 3A 16B 14C 11Misc 4Journal 36Unranked 30

Year	Rank	Type	Title / Venue / Authors
2026	A	`conf`	Combining Structural and Textual Knowledge for Knowledge Graph Link Prediction via Large Language Models. WSDM Shijie Luo, Xinyuan Lu, Qinpei Zhao, Weixiong Rao
2025	A	`conf`	Bridging the Gap between Knowledge Graphs and LLMs for Multi-hop Question Answering. CIKM Shijie Luo, Xinyuan Lu, Qinpei Zhao, Weixiong Rao
2025	J	`jnl`	Cooperative Path Planning With Asynchronous Multiagent Reinforcement Learning. IEEE Trans. Mob. Comput. Jiaming Yin, Weixiong Rao, Yu Xiao, Keshuang Tang
2025	C	`conf`	Local-Global Context Encoding Architecture for the Insulin Prescription Recommendation. CSCWD Yi Wang, Qinpei Zhao, Weixiong Rao, Chengwei Wu, Xinyuan Lu, Jipeng Zhang, Ming Li, Quanquan Ge, Congrong Wang
2025	—	`conf`	MMKG-RAG: Retrieval-Augmented Generation with Multi-modal Knowledge Graph. DASFAA (6) Shuaitao Zhao, Shijie Luo, Xinyuan Lu, Weixiong Rao
2025	J	`jnl`	Multi-Agent Reinforcement Learning-Based Capacity Planning for On-Demand Vehicular Fog Computing. IEEE Trans. Intell. Veh. Wencan Mao, Jiaming Yin, Yushan Liu, Byungjin Cho, Yang Chen, Weixiong Rao, Yu Xiao
2025	—	`conf`	Real-Time Femoral Von Mises Stress Distribution Prediction via Graph Neural Networks. ADMA (3) Jie Zhang, Jiasheng Shi, Chenwei Wu, Yifan Lu, Qinpei Zhao, Wenxin Niu, Weixiong Rao, Shitan Wang, Shi Zhan, Bin Chen, Yanmei Jia
2025	A	`conf`	SimFormer: Multilevel Transformer on Learnable Mesh Graphs for Engineering Simulation. CIKM Jiasheng Shi, Fu Lin, Weixiong Rao, Ze Gao
2025	J	`jnl`	Towards Smarter and Safer Traffic Signal Control via Multiagent Deep Reinforcement Learning. Int. J. Intell. Syst. Jiajing Shen, Bingquan Yu, Qinpei Zhao, Weixiong Rao
2024	C	`conf`	An Automatic Nutrition Estimation Framework Based on Food Images from Diabetic Patients. HealthCom Jiarui Chen, Qinpei Zhao, Weixiong Rao, Yi Wang, Xinyuan Lu, Quanquan Ge, Ming Li, Congrong Wang
2024	J	`jnl`	Collaborative State Fusion in Partially Known Multi-agent Environments. CoRR Tianlong Zhou, Jun Shang, Weixiong Rao
2024	J	`jnl`	Cooperative Path Planning with Asynchronous Multiagent Reinforcement Learning. CoRR Jiaming Yin, Weixiong Rao, Yu Xiao, Keshuang Tang
2024	J	`jnl`	Learn to Optimize the Constrained Shortest Path on Large Dynamic Graphs. IEEE Trans. Mob. Comput. Jiaming Yin, Weixiong Rao, Qinpei Zhao, Chenxi Zhang, Pan Hui
2024	C	`conf`	Learn to Simulate Finite Element Analysis via Mesh-based Graph Networks. CSCWD Lingjun Fan, Qinpei Zhao, Jiasheng Shi, Fu Lin, Weixiong Rao
2024	J	`jnl`	Learning to Optimize State Estimation in Multi-Agent Reinforcement Learning-Based Collaborative Detection. IEEE Trans. Mob. Comput. Tianlong Zhou, Tianyi Shi, Hongye Gao, Weixiong Rao
2024	J	`jnl`	Learning-Based Finite Element Methods Modeling for Complex Mechanical Systems. CoRR Jiasheng Shi, Fu Lin, Weixiong Rao
2024	C	`conf`	Linear Encryption Techniques for Counteracting Information-based Stealthy Attacks. ICARCV Jun Shang, Hanwen Zhang, Weixiong Rao, Yiguang Hong
2024	—	`conf`	Road Network-based Vehicle Trajectory Imputation via Generative Adversarial Network. IoT Yichen Shi, Tianlong Zhou, Peiyuan Yin, Zhongyu Wang, Zhaojun Mao, Weixiong Rao
2024	J	`jnl`	Up-sampling-only and Adaptive Mesh-based GNN for Simulating Physical Systems. CoRR Fu Lin, Jiasheng Shi, Shijie Luo, Qinpei Zhao, Weixiong Rao, Lei Chen
2023	J	`jnl`	Category tree distance: a taxonomy-based transaction distance for web user analysis. Data Min. Knowl. Discov. Yinjia Zhang, Qinpei Zhao, Yang Shi, Jiangfeng Li, Weixiong Rao
2023	Misc	`conf`	Demo: A Multi-Agent Communication Framework in Cooperative Detection System. SEC Hongye Gao, Yichen Shi, Weixiong Rao, Qiongmin Ma
2023	J	`jnl`	DualTaxoVec: Web user embedding and taxonomy generation. Knowl. Based Syst. Qinpei Zhao, Lingjun Fan, Yinjia Zhang, Jiangfeng Li, Yang Shi, Weixiong Rao, Xiang Liu
2023	A	`conf`	Learning to Simulate Complex Physical Systems: A Case Study. CIKM Jiasheng Shi, Fu Lin, Weixiong Rao
2023	J	`jnl`	Multivariate Time-Series Forecasting Model: Predictability Analysis and Empirical Study. IEEE Trans. Big Data Qinpei Zhao, Guangda Yang, Kai Zhao, Jiaming Yin, Weixiong Rao, Lei Chen
2023	J	`jnl`	Outdoor Position Recovery From Heterogeneous Telco Cellular Data. IEEE Trans. Knowl. Data Eng. Yige Zhang, Weixiong Rao, Kun Zhang, Lei Chen
2023	A	`conf`	Poster: Two-Phase KalmanNet Based Collaborative Detection Framework. ICDCS Tianlong Zhou, Weixiong Rao, Feng Ye
2023	—	`conf`	STIP: A Seasonal Trend Integrated Predictor for Blood Glucose Level in Time Series. ADMA (5) Weixiong Rao, Guangda Yang, Qinpei Zhao, Yuzhi Liu, Hongming Zhu, Ming Li, Xuefeng Li, Yinjia Zhang
2023	B	`conf`	Scalable Communication for Mobile Multi-Agent Cooperative Detection. MDM Hongye Gao, Tianlong Zhou, Weixiong Rao, Feng Ye
2023	—	`conf`	TIGAN: Trajectory Imputation via Generative Adversarial Network. ADMA (5) Yichen Shi, Hongye Gao, Weixiong Rao
2022	J	`jnl`	Context-Aware Telco Outdoor Localization. IEEE Trans. Mob. Comput. Yige Zhang, Weixiong Rao, Mingxuan Yuan, Jia Zeng, Pan Hui
2022	B	`conf`	Image Segmentation and Recognition for Multi-Class Chinese Food. ICIP Yuxiang Liang, Jiangfeng Li, Qinpei Zhao, Weixiong Rao, Chenxi Zhang, Congrong Wang
2021	J	`jnl`	A Data-Driven Sequential Localization Framework for Big Telco Data. IEEE Trans. Knowl. Data Eng. Fangzhou Zhu, Mingxuan Yuan, Xike Xie, Ting Wang, Shenglin Zhao, Weixiong Rao, Jia Zeng
2021	B	`conf`	BILPAS: Blockchain-Based Indoor Location Paging and Answering Service. IWCMC Changxin Yang, Erwu Liu, Rui Wang, Weixiong Rao, Shaojun Feng
2021	J	`jnl`	Context-aware Telco Outdoor Localization. CoRR Yige Zhang, Weixiong Rao, Mingxuan Yuan, Jia Zeng, Pan Hui
2021	—	`conf`	Deep Reinforcement Learning Based Dynamic Route Planning for Minimizing Travel Time. ICC Workshops Yuanzhe Geng, Erwu Liu, Rui Wang, Yiming Liu, Weixiong Rao, Shaojun Feng, Zhao Dong, Zhiren Fu, Yanfen Chen
2021	—	`conf`	Indoor Height Recovery by Cellular Signal Data: Poster Abstract. IoTDI Jinhua Lv, Yige Zhang, Weixiong Rao, Erwu Liu, Rui Wang, Zhao Dong, Zhiren Fu, Yanfen Chen
2021	B	`conf`	Learning Shortest Paths on Large Dynamic Graphs. MDM Jiaming Yin, Weixiong Rao, Chenxi Zhang
2021	J	`jnl`	Outdoor Position Recovery from HeterogeneousTelco Cellular Data. CoRR Yige Zhang, Weixiong Rao, Kun Zhang, Lei Chen
2021	A	`conf`	Poster: Learning Index on Content-based Pub/Sub. ICDCS Cheng Lin, Qinpei Zhao, Weixiong Rao
2021	—	`conf`	Reinforcement Learning for Diabetes Blood Glucose Control with Meal Information. ISBRA Jinhao Zhu, Yinjia Zhang, Weixiong Rao, Qinpei Zhao, Jiangfeng Li, Congrong Wang
2021	B	`conf`	TaxoVec: Taxonomy Based Representation for Web User Profiling. ICMI Qinpei Zhao, Xiongbaixue Yan, Yinjia Zhang, Weixiong Rao, Jiangfeng Li, Chao Mi, Jessie Chen
2021	J	`jnl`	The Levy Flight of Cities: Analyzing Social-Economical Trajectories with Auto-Embedding. CoRR Linfang Tian, Kai Zhao, Jiaming Yin, Huy Vo, Weixiong Rao
2021	J	`jnl`	Transfer Learning-Based Outdoor Position Recovery With Cellular Data. IEEE Trans. Mob. Comput. Yige Zhang, Aaron Yi Ding, Jörg Ott, Mingxuan Yuan, Jia Zeng, Kun Zhang, Weixiong Rao
2021	—	`conf`	aHCQ: Adaptive Hierarchical Clustering Based Quantization Framework for Deep Neural Networks. PAKDD (2) Jiaxin Hu, Weixiong Rao, Qinpei Zhao
2020	J	`jnl`	ATR: Automatic Trajectory Repairing With Movement Tendencies. IEEE Access Peng Zhao, Aoqian Zhang, Chenxi Zhang, Jiangfeng Li, Qinpei Zhao, Weixiong Rao
2020	B	`conf`	Accurate Demand Forecasting for Retails with Deep Neural Networks. EDBT Shanhe Liao, Weixiong Rao
2020	B	`conf`	IFLoc: Indoor Height Estimation by Telco Data. MDM Jinhua Lv, Yige Zhang, Weixiong Rao, Jiehua Chen, Xiaofeng Hu, Qinglin Chen
2020	J	`jnl`	SST: Synchronized Spatial-Temporal Trajectory Similarity Search. GeoInformatica Peng Zhao, Weixiong Rao, Chengxi Zhang, Gong Su, Qi Zhang
2020	A	`conf`	Smarter and Safer Traffic Signal Controlling via Deep Reinforcement Learning. CIKM Bingquan Yu, Jinqiu Guo, Qinpei Zhao, Jiangfeng Li, Weixiong Rao
2020	—	`conf`	Towards Accurate Retail Demand Forecasting Using Deep Neural Networks. DASFAA (3) Shanhe Liao, Jiaming Yin, Weixiong Rao
2019	A	`conf`	Automatic User Categorization Through Large Transaction Data. ICME Ying Zhang, Yinjia Zhang, Qinpei Zhao, Weixiong Rao
2019	B	`conf`	CLEAN: Frequent Pattern-Based Trajectory Spatial-Temporal Compression on Road Networks. MDM Peng Zhao, Qinpei Zhao, Chenxi Zhang, Gong Su, Qi Zhang, Weixiong Rao
2019	C	`conf`	DeepLoc: deep neural network-based telco localization. MobiQuitous Yige Zhang, Yu Xiao, Kai Zhao, Weixiong Rao
2019	A	`conf`	Experimental Study of Multivariate Time Series Forecasting Models. CIKM Jiaming Yin, Weixiong Rao, Mingxuan Yuan, Jia Zeng, Kai Zhao, Chenxi Zhang, Jiangfeng Li, Qinpei Zhao
2019	A	`conf`	PRNet: Outdoor Position Recovery for Heterogenous Telco Data by Deep Neural Network. CIKM Yige Zhang, Weixiong Rao, Kun Zhang, Mingxuan Yuan, Jia Zeng
2019	C	`conf`	Size Prediction for Online Clothing Shopping with Heterogeneous Information. CIS Cheng Lin, Qinpei Zhao, Jiangfeng Li, Weixiong Rao
2019	B	`conf`	Traffic Congestion Prediction by Spatiotemporal Propagation Patterns. MDM Xiaolei Di, Yu Xiao, Chao Zhu, Yang Deng, Qinpei Zhao, Weixiong Rao
2019	J	`jnl`	Transfer Learning-Based Outdoor Position Recovery with Telco Data. CoRR Yige Zhang, Aaron Yi Ding, Jörg Ott, Mingxuan Yuan, Jia Zeng, Kun Zhang, Weixiong Rao
2018	—	`conf`	A beautiful image or not: a comparative study on classical machine learning and deep learning. ICCIP Ying Zhang, Zhaotong Li, Qinpei Zhao, Hongfei Fan, Weixiong Rao, Jessie Chen
2018	C	`conf`	BSLoc: Base Station ID-Based Telco Outdoor Localization. ALGOSENSORS Jinhua Lv, Qinpei Zhao, Jiangfeng Li, Yige Zhang, Xiaolei Di, Weixiong Rao, Mingxuan Yuan, Jia Zeng
2018	—	`conf`	Context Aware Telco Churn Prediction Powered By Temporal Feature Engineering. PerCom Workshops Ruirui Bai, Weixiong Rao, Mingxuan Yuan, Jia Zeng, Jianfeng Yan
2018	Misc	`conf`	Deep Neural Network-based Telco Outdoor Localization. SenSys Yige Zhang, Weixiong Rao, Yu Xiao
2018	B	`conf`	Frequent Pattern-Based Map-Matching on Low Sampling Rate Trajectories. MDM Yukun Huang, Weixiong Rao, Zhiqiang Zhang, Peng Zhao, Mingxuan Yuan, Jia Zeng
2018	Misc	`conf`	Frequent Pattern-based Trajectory Completion. SenSys Zhiqiang Zhang, Weixiong Rao, Xiaolei Di, Peng Zhao, Xiaofeng Xu, Fehmi Ben Abdesslem
2018	—	`conf`	Research on WSN Routing Algorithm for Vegetable Greenhouse. HPCCT Shipu Xu, Yunsheng Wang, Yong Liu, Weixiong Rao, Mingzhou Ma, Jingyin Zhao, Chenxi Zhang
2017	—	`conf`	An Efficient Boolean Expression Index by Compression. DASFAA Workshops Jin Tao, Chenxi Zhang, Weixiong Rao
2017	A	`conf`	Are HTTP/2 Servers Ready Yet? ICDCS Muhui Jiang, Xiapu Luo, TungNgai Miu, Shengtuo Hu, Weixiong Rao
2017	B	`conf`	Confidence Model-Based Data Repair for Telco Localization. MDM Yige Zhang, Weixiong Rao, Mingxuan Yuan, Jia Zeng, Hua Yang
2017	—	`conf`	Demo abstract: Telco localization techniques. INFOCOM Workshops Peng Zhao, Chenxi Zhang, Yukun Huang, Weixiong Rao, Fangzhou Zhu, Ning Liu, Jie Geng, Mingxuan Yuan, Jia Zeng
2017	—	`conf`	Efficient Compression on Real World Directed Graphs. APWeb/WAIM (1) Guohua Li, Weixiong Rao, Zhongxiao Jin
2017	B	`conf`	Experimental Study of Telco Localization Methods. MDM Yukun Huang, Weixiong Rao, Fangzhou Zhu, Ning Liu, Mingxuan Yuan, Jia Zeng, Hua Yang
2017	—	`conf`	Predicting stock market indexes with world news. ICSAI Yunsong Zhong, Qinpei Zhao, Weixiong Rao
2017	Misc	`conf`	Searching k-Nearest Neighbor Trajectories on Road Networks. ADC Pengcheng Yuan, Qinpei Zhao, Weixiong Rao, Mingxuan Yuan, Jia Zeng
2017	B	`conf`	Topic Model-Based Road Network Inference from Massive Trajectories. MDM Renjie Zheng, Qin Liu, Weixiong Rao, Mingxuan Yuan, Jia Zeng, Zhongxiao Jin
2016	—	`conf`	BMF: An Indexing Structure to Support Multi-element Check. WAIM (1) Chenyang Xu, Weixiong Rao
2016	A	`conf`	City-Scale Localization with Telco Big Data. CIKM Fangzhou Zhu, Chen Luo, Mingxuan Yuan, Yijian Zhu, Zhengqing Zhang, Tao Gu, Ke Deng, Weixiong Rao, Jia Zeng
2016	—	`conf`	Compression-aware graph computation. UbiComp Adjunct Guohua Li, Weixiong Rao
2016	—	`conf`	Graph Summarization Based on Attribute-Connected Network. APWeb/WAIM Workshops Siqi Liu, Qinpei Zhao, Jiangfeng Li, Weixiong Rao
2016	A	`conf`	LDA Revisited: Entropy, Prior and Convergence. CIKM Jianwei Zhang, Jia Zeng, Mingxuan Yuan, Weixiong Rao, Jianfeng Yan
2016	—	`conf`	Trajbase: searching trajectories in multi-region. UrbanGIS@SIGSPATIAL Renjie Zheng, Qin Liu, Hanjun Mao, Hongming Zhu, Weixiong Rao
2015	—	`conf`	A Unified Computation Engine for Big Data Analytics. BDC Chenyang Xu, Yanjie Chen, Qin Liu, Weixiong Rao, Hong Min, Gong Su
2015	—	`conf`	Clustering Large Undirected Graphs on External Memory. HotPlanet@MobiCom Qin Liu, Jiakai Xiao, Weixiong Rao
2015	J	`jnl`	Detecting Malware Based on DNS Graph Mining. Int. J. Distributed Sens. Networks Futai Zou, Siyu Zhang, Weixiong Rao, Ping Yi
2015	—	`conf`	L-Graph: A General Graph Analytic System on Continuous Computation. HotPlanet@MobiCom Weixiong Rao, Eiko Yoneki, Lei Chen
2015	J	`jnl`	MTAF: An Adaptive Design for Keyword-Based Content Dissemination on DHT Networks. IEEE Trans. Parallel Distributed Syst. Weixiong Rao, Roman Vitenberg, Lei Chen, Sasu Tarkoma
2015	C	`conf`	Octopus: Hybrid Big Data Integration Engine. CloudCom Yanjie Chen, Chenyang Xu, Weixiong Rao, Hong Min, Gong Su
2015	—	`ed.`	Proceedings of the 6th International Workshop on Hot Topics in Planet-Scale Measurement, HotPlanet@MobiCom 2015, Paris, France, September 7, 2015 HotPlanet@MobiCom Pan Hui, Fehmi Ben Abdesslem, Weixiong Rao
2015	J	`jnl`	Ranked content advertising in online social networks. World Wide Web Weixiong Rao, Lei Chen, Ilaria Bartolini
2015	J	`jnl`	Towards Maximizing Timely Content Delivery in Delay Tolerant Networks. IEEE Trans. Mob. Comput. Weixiong Rao, Kai Zhao, Yan Zhang, Pan Hui, Sasu Tarkoma
2014	—	`conf`	Cost-Based Join Algorithm Selection in Hadoop. WISE (2) Jun Gu, Shu Peng, Xiaoyang Sean Wang, Weixiong Rao, Min Yang, Yu Cao
2014	C	`conf`	Cost-Based Optimization of Logical Partitions for a Query Workload in a Hadoop Data Warehouse. APWeb Shu Peng, Jun Gu, Xiaoyang Sean Wang, Weixiong Rao, Min Yang, Yu Cao
2014	J	`jnl`	Evaluating continuous top-k queries over document streams. World Wide Web Weixiong Rao, Lei Chen, Shudong Chen, Sasu Tarkoma
2014	J	`jnl`	Explaining the Power-law Distribution of Human Mobility Through Transportation Modality Decomposition. CoRR Kai Zhao, Mirco Musolesi, Pan Hui, Weixiong Rao, Sasu Tarkoma
2014	J	`jnl`	From Wireless Positioning to Mobile Positioning: An Overview of Recent Advances. IEEE Syst. J. Dawei Liu, Bin Sheng, Fen Hou, Weixiong Rao, Hongli Liu
2013	J	`jnl`	Bitlist: New Full-text Index for Low Space Cost and Efficient Keyword Search. Proc. VLDB Endow. Weixiong Rao, Lei Chen, Pan Hui, Sasu Tarkoma
2013	A	`conf`	Replication-Based Load Balancing in Distributed Content-Based Publish/Subscribe. IPDPS Weixiong Rao, Chao Chen, Pan Hui, Sasu Tarkoma
2013	—	`conf`	Subscription Privacy Protection in Topic-Based Pub/Sub. DASFAA (1) Weixiong Rao, Lei Chen, Mingxuan Yuan, Sasu Tarkoma, Hong Mei
2013	J	`jnl`	Toward Efficient Filter Privacy-Aware Content-Based Pub/Sub Systems. IEEE Trans. Knowl. Data Eng. Weixiong Rao, Lei Chen, Sasu Tarkoma
2012	A*	`conf`	A General Framework for Publishing Privacy Protected and Utility Preserved Graph. ICDM Mingxuan Yuan, Lei Chen, Weixiong Rao, Hong Mei
2012	J	`jnl`	Distributed top-k full-text content dissemination. Distributed Parallel Databases Weixiong Rao, Lei Chen
2012	—	`conf`	Energy-aware keyword search on mobile phones. MCC@SIGCOMM Weixiong Rao, Kai Zhao, Eemil Lagerspetz, Pan Hui, Sasu Tarkoma
2012	A	`conf`	MOVE: A Large Scale Keyword-Based Content Filtering and Dissemination System. ICDCS Weixiong Rao, Lei Chen, Pan Hui, Sasu Tarkoma
2012	B	`conf`	Maximizing timely content advertising in DTNs. SECON Weixiong Rao, Kai Zhao, Yan Zhans, Pan Hui, Sasu Tarkoma
2011	J	`jnl`	A distributed full-text top-k document dissemination system in distributed hash tables. World Wide Web Weixiong Rao, Lei Chen
2011	J	`jnl`	STAIRS: Towards efficient full-text filtering and dissemination in DHT environments. VLDB J. Weixiong Rao, Lei Chen, Ada Wai-Chee Fu
2011	—	`conf`	Towards optimal keyword-based content dissemination in DHT-based P2P networks. Peer-to-Peer Computing Weixiong Rao, Roman Vitenberg, Sasu Tarkoma
2010	J	`jnl`	Optimal Resource Placement in Structured Peer-to-Peer Networks. IEEE Trans. Parallel Distributed Syst. Weixiong Rao, Lei Chen, Ada Wai-Chee Fu, Guoren Wang
2009	A*	`conf`	On Efficient Content Matching in Distributed Pub/Sub Systems. INFOCOM Weixiong Rao, Lei Chen, Ada Wai-Chee Fu, Hanhua Chen, Futai Zou
2009	A*	`conf`	STAIRS: Towards Efficient Full-Text Filtering and Dissemination in a DHT Environment. ICDE Weixiong Rao, Ada Wai-Chee Fu, Lei Chen, Hanhua Chen
2007	A	`conf`	Optimal proactive caching in peer-to-peer network: analysis and application. CIKM Weixiong Rao, Lei Chen, Ada Wai-Chee Fu, Yingyi Bu
2005	J	`jnl`	XEvent: An Event Notification System over Distributed Hash Table (DHT) Networks. IEEE Intell. Informatics Bull. Ruili Wang, Weixiong Rao, Chengqi Zhang
2004	C	`conf`	MTrie: A Scalable Filtering Engine of Well-Structured XML Message Stream. APWeb Weixiong Rao, Yingjian Chen, Xinquan Zhang, Fanyuan Ma
2004	—	`conf`	Querying XML Data over DHT System Using XPeer. GCC Weixiong Rao, Hui Song, Fanyuan Ma
2003	C	`conf`	DEBIZ: A Decentralized Lookup Service for E-commerce. APWeb Zengde Wu, Weixiong Rao, Fan-Yuan Ma
2003	—	`conf`	Scalable Filtering of Well-Structured XML Message Stream. GCC (2) Weixiong Rao, Yingjian Chen, Xinquan Zhang, Fanyuan Ma