Xiaorui (Ray) Wang  (Pronounced Shiao-Ray Wong) Assistant Professor Department of Electrical Engineering and Computer Science University of Tennessee, Knoxville E - m a i l :   x w a n g ( a-t ) e e c s ( d-o-t ) u t k ( d-o-t ) e d u Phone:  (865) 974-0627    Fax: (865) 974-5483 421 Ferris Hall Department of Electrical Engineering and Computer Science The University of Tennessee Knoxville, TN  37996

[  Short Bio  |  Research  |  Awards  |  Publications  |  Teaching  |  Students  |  Professional Service  |  PACS Laboratory  ]

• NEW!  Multiple Research Assistant positions are available for self-motivated Ph.D. students to work on power-aware computer systems, distributed real-time embedded systems, and wireless sensor networks.  Please see details here.

• More news can be found on the PACS Laboratory homepage.

Research Projects

• Power, thermal, and performance management for virtualized data centers [HPCA'08] [ISCA'09] [PACT'09] [RTSS'08] [IWQoS'09] [ICAC'07]

• Distributed real-time embedded systems [TC'09] [RTAS'09] [ECRTS'09] [RTSS'08] [TPDS'07] [ECRTS'07] [RTSS'05] [RTSS'05] [RTAS'04]

• Wireless sensor networks and cyber-physical systems [EWSN'09] [IWQoS'06] [ToSN'05] [SenSys'03]

• Quality of Service (QoS) control in computing systems [TPDS'08] [ECRTS'09] [IWQoS'09] [RTAS'04]

    Acknowledgements: Our research is supported by NSF CAREER Award (CNS-0845390, PI: Wang, 2009-2014), NSF CSR Grants (CNS-0720663, PI: Wang, 2007-2010; CNS-0915959, PI: Wang, 2009-2012), Office of Naval Research (N00014-09-1-0750, PI: Wang, 2009-2012), Microsoft Research Award (PI: Wang), IBM Award (PI: Wang), NSF CyberTrust Grants (CNS-0831466; CNS-0716492), DHS SERRI, and ORNL.

Selected Awards & Research Impacts

• NSF CAREER Award, 2009.

• Chancellor's Award for Professional Promise in Research and Creative Achievement, University of Tennessee, 2009. (4 winners at UT annually)

• Best Paper Award, the 29th IEEE Real-Time Systems Symposium (RTSS), 2008. (1 out of 189 submitted papers)

• Power-Aware Computing Award, Microsoft Research, 2008.

• IBM Real-Time Innovation Award, 2007.

• Power control algorithm directly adopted in more than a billion dollars worth (annually) of IBM servers (10+ models).

• The 23rd most cited paper in all fields of Computer Science in 2003, CiteSeer, 2006. (Cited 500+ times)

Selected Publications (Full list)

Selected Journal Papers

• "Towards Controllable Distributed Real-Time Systems with Feasible Utilization Control",

• IEEE Transactions on Computers, 2009.

• "Control-Based Adaptive Middleware for Real-time Image Transmission over Bandwidth-Constrained Networks",

• IEEE Transactions on Parallel and Distributed Systems, 2008.

• "DEUCON: Decentralized End-to-End Utilization Control for Distributed Real-Time Systems",

• IEEE Transactions on Parallel and Distributed Systems, 2007.

• "Integrated Coverage and Connectivity Configuration for Energy Conservation in Sensor Networks",

• ACM Transactions on Sensor Networks, 2005.

• "Feedback Utilization Control in Distributed Real-Time Systems with End-to-End Tasks",

• IEEE Transactions on Parallel and Distributed Systems, 2005.

Selected Conference Papers

• "SHIP: Scalable Hierarchical Power Control for Large-Scale Data Centers", PACT 2009.

• "Integrated Control of Matching Delay and CPU Utilization in Information Dissemination Systems", IEEE IWQoS 2009.

• "Co-Con: Coordinated Control of Power and Application Performance for Virtualized Server Clusters", IEEE IWQoS 2009.

• "Hierarchical Utilization Control for Real-Time and Resilient Power Grid", ECRTS 2009.

• "Temperature-Constrained Power Control for Chip Multiprocessors with Online Model Estimation", ISCA 2009.

• "Power-Aware CPU Utilization Control for Distributed Real-Time Systems", IEEE RTAS 2009.

• "C-MAC: Model-driven Concurrent Medium Access Control for Wireless Sensor Networks", IEEE INFOCOM 2009.

• "Flow-Based Real-Time Communication in Multi-Channel Wireless Sensor Networks", EWSN 2009.

• "Power-Efficient Response Time Guarantees for Virtualized Enterprise Servers", IEEE RTSS 2008.

• (Best paper award: 1 out of 189 submitted papers)

• "Cluster-level Feedback Power Control for Performance Optimization", IEEE HPCA 2008.

• "On Controllability and Feasibility of Utilization Control in Distributed Real-Time Systems", ECRTS 2007.

• "Server-level Power Control", IEEE ICAC 2007.

• "Real-time Power Aware Routing in Wireless Sensor Networks", IEEE IWQoS 2006.

• "Decentralized Utilization Control in Distributed Real-Time Systems", IEEE RTSS 2005.

• "Enhancing the Robustness of Distributed Real-Time Middleware via End-to-End Utilization Control", IEEE RTSS 2005.

• "CAMRIT: Control-based Adaptive Middleware for Real-time Image Transmission",  IEEE RTAS 2004.

• "End-to-End Utilization Control in Distributed Real-Time Systems", IEEE ICDCS 2004.

• "Integrated Coverage and Connectivity Configuration in Wireless Sensor Networks", ACM SenSys, 2003.

• (The 23rd most cited paper in all fields of Computer Science in 2003, cited 500+ times)

• "Feedback Control Real-Time Scheduling in ORB Middleware", IEEE RTAS 2003.

Teaching

• ECE 692-01, Power-Aware Computer Systems, Fall 2009.

• ECE 455/599, Embedded Systems Design, Spring 2009, Spring 2008, Spring 2007.

• ECE 555, Real-Time Embedded Systems, Fall 2008.

• ECE 599-26/692-06, Wireless Sensor Networks, Fall 2007.

• ECE 206, Electrical Engineering Computations, Fall 2006.

Students

• Current Graduate Students

  • Ming Chen, (Ph.D., 2006 - 2010 expected; Interned at NEC Labs, NJ)

  • Yefu Wang, (Ph.D., 2007 - )

  • Xiaodong Wang, (Ph.D., 2007 - )

  • Xing Fu, (Ph.D., 2008 - )

  • Kai Ma, (Ph.D., 2008 - )

  • Yanjun Yao, (Ph.D., 2008 - )

  • Robert Deaver, (Ph.D., 2009 - )

  • Xue Li, (Ph.D., 2009 - )

  • Mojtaba Amiri-Kamalabad, (Ph.D., 2009 - )

• Former Students

  • Nitish Jha, (M.S., 08/2008), Thesis: Multi-Channel Real-Time Communication in Wireless Sensor Networks.

  • Clinton Nolan

  • Ben Taylor

  • Garrett Smith

• Prospective Students

 I am looking for 1 or 2 Ph.D. students to start in Spring or Fall 2010.   Students will be working on power-aware computer systems, distributed real-time embedded systems, or wireless sensor networks.  Preference will be given to candidates who already have Master degrees in related fields (e.g., Computer Science, Computer Engineering, Control Systems, etc).  Exceptional undergraduate students with considerable research experience may also be considered.  For students who want to work on power-aware computing, experience in computer architecture and microprocessors is preferred.  For students who want to work on distributed real-time embedded systems, experience in Linux systems programming is preferred.  For students who want to work on wireless sensor networks, experience in NS-2 or Berkeley motes is preferred.  

A prospective Ph.D. student is strongly encouraged to read at least one of my papers listed above and indicate in the email (1) which paper s/he has read and what the paper is about, (2) what s/he would like to do for doctoral research, and (3) how her/his proposed research relates to my current research.  Students with interesting research plans will be given the highest preference.   Successful candidates will receive full tuition waiver and a monthly stipend. 

For more details about my research, please refer to the Power-Aware Computer Systems Laboratory web page.

Professional Activities

• Program Committee Member

• The 15th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA 2009).

• The 25th ACM Symposium On Applied Computing (SAC 2010), Power-Aware Design and Optimization Track.

• The 4th IFIP/IEEE International Workshop on Feedback Control Implementation and Design in Computing Systems and Networks (FeBID 2009).

• The 2nd International Workshop on Cyber-Physical Systems (WCPS 2009).

• The 3rd IFIP/IEEE International Workshop on Feedback Control Implementation and Design in Computing Systems and Networks (FeBID 2008).

• The 2008 IEEE/IFIP International Conference On Embedded and Ubiquitous Computing (EUC 2008).

• The 13th IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS 2007), Track on Real-Time and Embedded Applications / Benchmarks.

• The 2nd IFIP/IEEE International Workshop on Feedback Control Implementation and Design in Computing Systems and Networks (FeBID 2007).

• The IEEE/ACM International Wireless Communications and Mobile Computing Conference 2007 (IWCMC 2007), Computer and Network Security Symposium.

• The 3rd International Conference on Embedded Software and Systems (ICESS 2007).

• Demo/Poster Co-Chair, the 15th IEEE Real-Time and Embedded Technology and Applications Symposium, San Francisco (RTAS 2009), CA, 2009.

• Track Co-Chair, embedded systems track, the 51st IEEE Midwest Symposium on Circuits and Systems (MWSCAS), 2008.

• Proposal Review Panelist, National Science Foundation (NSF), NeTS and CSR programs, Arlington, VA, April 2007, June 2008.

• Ad hoc reviewer, NSF CMMI Division, 2008.

• Publicity Chair, the 16th International Workshop on Parallel and Distributed Real-Time Systems (WPDRTS 2008), Miami, Florida, April 2008.

• Evaluation Panelist, the National Defense Science and Engineering Graduate (NDSEG) Fellowship Program, American Society for Engineering Education (ASEE), Feb 2007.

• Submission Chair, the 14th International Workshop on Parallel and Distributed Real-Time Systems (WPDRTS 2006), Island of Rhodes, Greece, 2006.

• Reviewer for IEEE Trans on Computers, IEEE Trans on Mobile Computing, IEEE Trans on Parallel and Distributed Systems, IEEE Trans on Computer-Aided Design of Integrated Circuits and Systems, IEEE Trans on Systems, Man and Cybernetics, IEEE Transactions on Industrial Informatics, ACM Trans on Sensor Networks, ACM Journal of Wireless Networks, Elsevier Computer Communications Journal, IBM Systems Journal, Ad Hoc & Sensor Wireless Networks, and a number of conferences.