Rui Tan       

Rui Tan

Associate Professor
School of Computer Science and Engineering
Nanyang Technological University

E-mail:  tanrui@ntu.edu.sg
Address: N4-02C-85, 50 Nanyang Ave, Singapore 639798
Phone:   +65 6790 5491
	

I am working with the members of NTU IoT Sensing Group to conduct research on networked sensing in various cyber-physical systems that are carried by humans, embedded in infrastructures, and distributed in wild environments. With an experimental basis, our research tries to understand how the physical processes affect the cyber systems (sensor networks and the broader Internet of Things) and exploit certain properties of the physical processes to advance the functional and non-functional aspects of the cyber systems. Our research has been recognized by various best paper awards and runner-ups at prestigious international conferences. With immediate application potential, our research has been funded externally by government authorities and companies in the information technology, energy, and manufacturing sectors, through 10 projects as of 2021. I have been serving on the technical program committees of various international conferences and also the editorial boards of journals that are related to networked sensing.


Research interests

  • AIoT (AI + IoT)
  • Sensing for resilient system functions (e.g., timing, synchronization, location, etc)
  • Thermal and energy management in data centers
  • Secure sensing and control in smart grids

Awards and honors

  1. SenSys'21 Best Paper Award Runner-Up
    For paper LIMU-BERT: Unleashing the Potential of Unlabeled Data for IMU Sensing Applications
  2. IPSN'21 Best Artifact Award Runner-Up
    For paper PhyAug: Physics-Directed Data Augmentation for Deep Sensing Model Transfer in Cyber-Physical Systems
  3. INFOCOM'20 Distinguished TPC Member
  4. IPSN'17 Best Paper Award
    For paper Natural Timestamping Using Powerline Electromagnetic Radiation
    2 (tie) out of 19 accepted papers selected from 104 submissions
  5. CPSR-SG'17 Best Paper Award
    For paper Hidden Moving Target Defense in Smart Grids
  6. INFOCOM'17 Distinguished TPC Member
  7. IPSN'14 Best Paper Award Runner-Up
    For paper Aquatic Debris Monitoring Using Smartphone-Based Robotic Sensors
    2 out of 23 accepted papers selected from 111 submissions
  8. PerCom'13 Mark Weiser Best Paper Award Finalist
    For paper Supero: A Sensor System for Unsupervised Residential Power Usage Monitoring
    3 out of 19 accepted full papers selected from 170 submissions
  9. Outstanding Academic Performance Award
    from City University of Hong Kong, 2009
  10. Research Tuition Scholarship
    from City University of Hong Kong, 2009
  11. Rockwell Master Scholarship
    from Rockwell Automation, Inc., 2006

Education

  • PhD (2010) in Computer Science, City University of Hong Kong
  • MS (2007) in Pattern Recognition and Intelligent Systems, Shanghai Jiao Tong University
  • BEng with Honors (2004) in Automation, Shanghai Jiao Tong University, China

Employments

  • School of Computer Science and Engineering, Nanyang Technological University
    • Associate Professor (2021-now)
    • Assistant Professor (2016-2021)
  • Advanced Digital Sciences Center, University of Illinois at Urbana-Champaign (UIUC)
    • Adjunct Senior Research Scientist (2016-2018)
    • Senior Research Scientist (2015)
    • Research Scientist (2012-2015)
    • Senior Research Affiliate (2012-2015), Coordinated Science Laboratory of UIUC
  • Department of Computer Science and Engineering, Michigan State University
    • Postdoctoral Research Associate (2010-2012)

Selected publications (☞ publication list)

Names underlined are students, research staff, visiting students who worked directly with me in my group for the publication.
  1. [ACM/IEEE IPSN'21] Wenjie Luo, Zhenyu Yan, Qun Song, Rui Tan. PhyAug: Physics-Directed Data Augmentation for Deep Sensing Model Transfer in Cyber-Physical Systems. Best Artifact Award Runner-Up. [pdf] [code and data] [video presentation]
  2. [IEEE TSUSC] Duc Van Le, Yingbo Liu, Rongrong Wang, Rui Tan, Lek Heng Ngoh. Air Free-Cooled Tropical Data Center: Design, Evaluation, and Learned Lessons. [pdf]
  3. [IEEE ICDCS'20] Chaojie Gu, Linshan Jiang, Rui Tan, Mo Li, Jun Huang. Attack-Aware Data Timestamping in Low-Power Synchronization-Free LoRaWAN. [pdf] [video presentation]
  4. [ACM SenSys'19] Qun Song, Zhenyu Yan, Rui Tan. Moving Target Defense for Embedded Deep Visual Sensing against Adversarial Examples. [pdf] [slides]
  5. [ACM MobiCom'19] Zhenyu Yan, Qun Song, Rui Tan, Yang Li, Adams Wai Kin Kong. Towards Touch-to-Access Device Authentication Using Induced Body Electric Potentials. [pdf] [slides]
  6. [ACM UbiComp'18] Qun Song, Chaojie Gu, Rui Tan. Deep Room Recognition Using Inaudible Echos. [pdf] [slides]
  7. [ACM SenSys'17] Zhenyu Yan, Yang Li, Rui Tan, Jun Huang. Application-Layer Clock Synchronization for Wearables Using Skin Electric Potentials Induced by Powerline Radiation. [pdf] [slides]
  8. [ACM/IEEE IPSN'17] Yang Li, Rui Tan*, David Yau. Natural Timestamping Using Powerline Electromagnetic Radiation. *Corresponding author. Best Paper Award. [pdf] [slides]
  9. [IEEE RTSS'16] Sreejaya Viswanathan, Rui Tan*, David Yau. Exploiting Power Grid for Accurate and Secure Clock Synchronization in Industrial IoT. *Corresponding author. [pdf] [slides]
  10. [ACM/IEEE ICCPS'16] Rui Tan, Hoang Hai Nguyen, Eddy. Y. S. Foo, Xinshu Dong, David K. Y. Yau, Zbigniew Kalbarczyk, Ravishankar K. Iyer, Hoay Beng Gooi. Optimal False Data Injection Attack against Automatic Generation Control in Power Grids. [pdf] [slides]
  11. [ACM CCS'13] Rui Tan, Varun Badrinath Krishna, David K. Y. Yau, Zbigniew Kalbarczyk. Impact of Integrity Attacks on Real-Time Pricing in Smart Grids. [pdf] [slides]
  12. [ACM/IEEE IPSN'13] Guojin Liu, Rui Tan*; Ruogu Zhou; Guoliang Xing; Wen-Zhan Song; Jonathan M. Lees. Volcanic Earthquake Timing using Wireless Sensor Networks. *Co-primary authors. [pdf] [slides]
  13. [IEEE PerCom'13] Dennis E. Phillips, Rui Tan*; Mohammad-Mahdi Moazzami; Guoliang Xing; Jinzhu Chen; David K. Y. Yau. Supero: A Sensor System for Unsupervised Residential Power Usage Monitoring. *Co-primary authors. Mark Weiser Best Paper Award Finalist. [pdf] [slides] [video]
  14. [IEEE RTSS'10] Rui Tan, Guoliang Xing, Jinzhu Chen, Wen-Zhan Song, Renjie Huang. Quality-driven Volcanic Earthquake Detection using Wireless Sensor Networks. [pdf] [slides] [code]
  15. [IEEE RTSS'09] Rui Tan, Guoliang Xing, Benyuan Liu, Jianping Wang. Impact of Data Fusion on Real-time Detection in Sensor Networks. [pdf] [slides]
  16. [ACM/IEEE TON, ACM MobiCom'09] Rui Tan, Guoliang Xing, Benyuan Liu, Jianping Wang, Xiaohua Jia. Exploiting Data Fusion to Improve the Coverage of Wireless Sensor Networks. [pdf] [appendices]

Technical reports

  1. Duc Van Le, Yingbo Liu; Rongrong Wang; Rui Tan. Tropical Data Centre Proof-of-Concept. Technical Report, Nanyang Technological University, 2019.
  2. Xinshu Dong, Hui Lin, Rui Tan; Ravishankar K. Iyer; Zbigniew Kalbarczyk. Software-Defined Networking for Smart Grid Resilience: Opportunities and Challenges. Coordinated Science Laboratory Technical Report UILU-ENG-15-2203, University of Illinois at Urbana-Champaign, Feb 2015.

Patents

  1. Method and System for Carrying Out Timing Related Tasks.
    Inventors (ordered alphabetically): Yang Li, Rui Tan, Sreejaya Viswanathan, David Yau.
    US Patent 16464264 (applied in May 2019; granted in Oct 2020).

Funding

  1. Air-Cooled Tropical Data Centre 2.0
    Funded by Singapore National Research Foundation (NRF). PI. S$1.62M, Apr 2021 to Mar 2023.
    As part of an NRF IAF-PP Programme (Sustainable Tropical Data Centre Testbed).
  2. Tropical Edge Data Centre Testbed.
    NTU Seed Grant. PI. Mar 2021 to Mar 2022.
  3. Attack-Resilient AI-Empowered Autonomous Cyber-Physical Systems.
    Funded by Singapore's National Satellite of Excellence in Trustworthy Software Systems (NSoE-TSS). PI. S$550K, Oct 2020 to Mar 2023.
  4. Practical Touch-Based Access Control for Indoor IoT Objects.
    Funded by Singapore's Ministry of Education Tier-1. PI. S$90K, Nov 2019 to Jul 2021.
  5. Location Sensing using Inaudible Echolocation and Powerline Electromagnetic Radiation.
    Funded by Singtel Cognitive and Artificial Intelligence Lab for Enterprises. PI. S$567K, 2019 to 2021.
  6. Feasibility of Object Localization using LoRa Radios.
    Funded by The Joint NTU-WeBank Research Centre of Eco-Intelligent Applications (THEIA). PI. S$100K, June 2019 to Dec 2020.
  7. AIoT for Predictive Maintenance.
    Funded by HP-NTU Digital Manufacturing Corporate Lab. NTU PI. S$3M, Oct 2018 to Oct 2022.
  8. Tropical Data Centre Proof-of-Concept.
    Funded by Info-communications Media Development Authority (IMDA) of Singapore. NTU PI. S$1.39M, Dec 2017 to Dec 2019.
  9. Strategic Capability Building for IoT Research.
    NTU CoE seed grant. PI. S$120K, September 2016 to August 2018.
  10. Resilient Cyber Infrastructure for Cyber-Physical Systems.
    Funded by Signapore National Research Foundation (NRF) as part of Delta corporate lab in NTU. Co-PI. S$600K, July 2016 to June 2019.
  11. Resilient Cyber-Physical Systems by Advanced Sensing and Computing.
    NTU Start-up Grant. PI. S$200K, Jan 2016 to Jan 2020. Project yield: 19 conference papers and 20 journal papers.
  12. PopSeCo: Power Plant Security by Advanced Sensing and Computing.
    Funded by Energy Market Authority (EMA) of Singapore. Co-PI. S$2.72M, Apr 2015 to Oct 2018.

Members

  • Current members:
    • Linshan Jiang (PhD student, 2017-)
      PhD program working title: Lightweight Privacy-Preserving Deep Learning and Inference in IoT.
    • Qun Song (PhD student, 2018-; Visiting Student @ NTU, 2017-2018)
      PhD program working title: Secure Machine Learning for Cyber-Physical Systems.
    • Wenjie Luo (PhD student, 2019-)
      PhD program working title: Exploiting Physical Knowledges for AIoT.
    • Van Duc Le (Research Fellow, 2018-)
    • Rongrong Wang (PhD student, 2020-; Research Associate, 2018-;)
      PhD program working title: Toward Energy-Efficient and Smart Built Environments via Advanced Sensing
    • Dongfang Guo (PhD student, 2021-; Research Associate, 2019-)
      PhD program working title: Exploit New Sensing Modalities for Location Sensing in IoT
    • Siyuan Zhou (PhD student, 2020-; Research Associate, 2019-)
      PhD program working title: Embedded Deep Visual Sensing in Industrial IoT
    • Jiale Chen (PhD student, 2021-; Research Associate, 2020-)
      PhD program working title: Efficient Designs of Deep Learning Models for IoT Objects
    • Huatao Xu (co-supervised PhD student, 2021-)
      PhD program working title: Deep Smart Sensing with Smartphones
    • Yimin Dai (Master student, 2021-)
      Thesis working title: Improve Intelligence and Robustness of IoT Systems via Sensor Fusion
    • Yuting Wu (Research Associate, 2021-)
    • Zhuoran Chen (Project Officer, 2021-)
    • Hongtuo Nie (Research Associate, 2021-)
  • NTU alumni:
    • Zhenyu Yan (PhD student, 2016-2020; Research Fellow, 2020-2021; joined the faculty of CUHK in 2021)
      PhD thesis: Exploiting Induced Skin Electric Potential for Body-Area IoT System Functions.
    • Chaojie Gu (PhD student, 2016-2020; Research Fellow, 2020-2021; joined the faculty of ZJU in 2021)
      PhD thesis: Exploiting LoRaWAN for Efficient and Resilient IoT Networks.
    • Qiping Yang (Project Officer, 2020-2021)
    • Yingbo Liu (Research Fellow, 2018-2019; joined the faculty of YNUFE in 2019)
    • Rutvij H. Jhaveri (Research Fellow, 2018-2019; joined the faculty of PDEU India in 2019)
    • Chongrong Fang (Visiting Student, 2018/11-2019/08; joined the faculty of SJTU in 2021)
    • Mengyao Zheng (Visiting Student, 2019/03-2019/11; admitted to Harvard master program in 2021)
    • Dixing Xu (Visiting Student, 2019/03-2019/07)
    • Jue Tian (Research Assistant/Visiting Student, 2016/08-2017/08)
    • Hangtai Li (Visiting Student, 2019/07-2020/01)
    • Jothi Prasanna Shanmuga Sundaram (Visiting Student, 2017/02-2017/07; admitted to UC Merced PhD program in 2018)
  • ADSC alumni:
    • Xin Lou (Postdoctoral Researcher, 2016-2018; now Research Scientist at ADSC)
    • Dima Dafer Rabadi (co-supervised PhD student, 2014-2018; joined I2R as Research Scientist in 2018)
    • Subhash Lakshminarayana (Researcher, 2015-2017; joined the faculty of University of Warwick in 2018)
    • Hoang Hai Nguyen (Research Engineer, 2013-2015; admitted to UIUC PhD program in 2015)
    • Yang Li (Postdoctoral Researcher, 2015-2018)
    • Sreejaya Viswanathan (Senior Research Engineer, 2015-2018)
    • Zhan Teng Teo (Research Engineer, 2015-2016)
    • Sheng-Yuan Chiu (Visiting Student, 2013, 2014)

Recent and current research

1. AIoT (2017-now)

Physics-directed domain adaptation

Run-time domain shifts are common in sensing systems designed with deep learning. The shifts can be caused by sensor characteristic variations. Existing transfer learning techniques require substantial target-domain data and thus incur high post-deployment overhead. We study how to exploit the first principle governing the domain shift to reduce the demand on target-domain data. Specifically, we use the first pinciple fitted with few source/target-domain data pairs to transform the existing source-domain training data into augmented data for updating the deep neural networks. We have applied this PhyAug approach to recover the accuracy losses of DeepSpeech2 caused by microphone characteristic using 5-second data collected from the microphone. This work won the IPSN'21 Best Artifact Award Runner-Up.
Moving target defense against adversarial examples

 
Deep models are vulnerable to adversarial examples. Many existing countermeasures build their security on the attacker's ignorance of the defense mechanisms and can be subverted once the attackers know the details of the defense. In this research, we apply the strategy of moving target defense to generate multiple fork models at run time from a factory-designed base model, that collaboratively detect and thwart adversarial examples. We also develop efficient implementations of our defense on embedded GPU platforms.
Deep learning-based location fingerprinting

This research uses a smartphone to emit a short inaudible acoustic chirp (only two milliseconds long) and record the ambient's reverberation as a fingerprint of the smartphone's location. We apply deep learning to deal with the challenge of the reverberation's limited information due to its narrow band and short recording time (only 0.1 seconds). We have applied this approach to implement a room-level localization system that can recognize up to 50 rooms with 97.7% accuracy. We have also used it to fingerprint 15 locations in a crowded museum and achieve 89% accuracy.
Lightweight privacy preservation for deep learning and inference

Resource-constrained edge devices are normally incapable of sophisticated privacy preservation mechanisms (e.g., homomorphic encryption). We have studied lightweight privacy preservation approaches, including independent Gaussian random projection for collaborative deep learning and data obfuscation using a shallow neural network for cloud inference using a deep neural network.



2. Sensing for resilient system functions, e.g., timing, synchronization, location, etc (2015-now)

Powerline forensic time and secure clock synchronization

The frequency of the alternating current (ac) voltage of power grid has tiny fluctuations over time. The fluctuations at different locations in a power grid are similar. Based on this, we match the fluctuation traces collected by two voltage sensors to identify the offset between their clocks and synchronize their clocks. This approach achieves 10 microseconds synchronization accuracy in a building and 100 microseconds accuracy for two nodes 10km apart. NTP in LAN can only achieve milliseconds accuracy; PTP (Precision Time Protocol) in LAN can achieve microseconds accuracy, but it requires PTP-enabled switches. Our system also gives security against the packet delay attack that is effective against message-exchange-based clock synchronization protocols. We also extend the above idea to study the accuracy of the forensic time derived from the powerline's magnetic field and achieve 150 milliseconds accuracy. This work won the IPSN'17 Best Paper Award.
Wearable clock synchronization and device authentication in ambient electrostatic field

Powerlines induce an electrostatic field oscillating at the power grid frequency (e.g., 50Hz). This field will cause the redistribution of the charges on the human body viewed as an uncharged equipotential conductor. The redistributed charges in return distort the near-body electric field. We use an ungrounded analog-to-digital converter to measure the transient potential difference between the human body and its near field. As any such two wearables capture the same power grid frequency, we use this common frequency with the principle of NTP and achieve milliseconds synchronization accuracy. Moreover, the transient potential difference signals captured by two wearables at close locations on the same human body are similar. We use this to develop a touch-based device authentication system, in which the user with a token device can authenticate himself/herself to a touchable smart object.
Summary: Exploit power network signals for time acquisition and location sensing

Our research has exploited the ac voltages of a power grid, the magnetic and electrostatic fields induced by the powerlines distributed in civil infrastructures to acquire time and location information. Time acquisition: We can synchronize wall-powered and wireless devices distributed in a geographic area served by the same power system (from building area to city area), with sub-millisecond and sub-second accuracy, respectively. We can also synchronize body-contacted devices worn by users distributed in the geographic area, with milliseconds accuracy. Location sensing: We exploit the powerline-induced magnetic field to perform SLAM in the building area. We also exploit the powerline electrostatic potential received by the human body to perform same-body detection for device authentication.
Secure data timestamping in LoRaWAN

LoRaWAN is promising for the applications of collecting low-rate data. Data samples need timestamps to make sense. However, tightly synchronizing the nodes incurs much overhead to bandwidth-limited LoRaWAN. We propose to perform gateway-side timestamping, which saves bandwidth. However, this gateway-side timestamping is vulnerable to a crafty frame delay attack. We conducted experiments in a campus network, and showed that, by setting up two attack devices (collider and eavesdropper), all LoRaWAN end devices in the area of about 50,000 square meters are affected by the attack. To develop attack awareness, we design a LoRaTS gateway based on cheap radio hardware to detect the carrier frequency offset (CFO) changes caused by the frame delay attack.



3. Thermal and energy management in data centers (2011-2014, 2017-now)

TDC1: World's first trial of air free-cooled data center in tropics (completed)

Air free cooling that utilizes natural outside air to cool the IT equipment in data center has been thought infeasible in Singapore's tropical condition with year-round high temperatures and humidity levels. From 2017 to 2019, we designed, constructed, and experimented with an air free-cooled and deeply sensorized data center testbed consisting of three server rooms hosting 12 server racks with 60kW total power rating. Our results show that Singapore's temperatures of up to 37℃ aren't a concern, but the cleaness and relative humidity of the air supplied to the servers need to be well controlled to maintain the servers' reliability. The energy efficiency metrics (e.g., DCiE) obtained on our testbed would be the upper limit in the local context. The findings of our research are documented in an NTU technical report and communicated to the local data center industry via various invited technical presentations. (Read more details on TDC1.)
TDC2: A commercially ready tropical data center (ongoing)

Based on our TDC1 research results, our TDC2 project sets up an actual data center with 400 servers in an enclosed and conditioned building. The main objectives of TDC2 include: 1) To develop a practicable methodology to determine the optimal setpoints for supply air temperature and relative humidity to achieve the highest energy efficiency; 2) To understand the server reliability under the optimal temperature/humidity setpoints and the implication on the cost-benefit relationship. During the project period, the TDC2 is deeply sensorized for research and meanwhile offers commercial computing services. After the project period, TDC2 will be fully handed over to our data center operator partner for offering continued commercial services. TDC2's ultimate goal is to seed high-temperature data centers with improved energy efficiency in Singapore's tropical condition. (Read CNA's news report on TDC2.)



4. Secure sensing and control in smart grids (2012-now)

False data injection attacks on smart grid controls

Recent high-profile cyber intrusions such as Stuxnet and Dragonfly have alerted us to a general class of integrity attacks called false data injection (FDI). In this research series, we studied the FDI attacks on the frequency control, voltage control (in both alternating current and direct current systems), state estimation, and voltage stability assessment of power systems. In 2015, we attacked the frequency control of an NTU microgrid to deviate the 50Hz grid frequency.
Time delay attacks on smart grid controls

Delaying the network transmissions of control/sensor data or misleading the controller to use outdated sensor data is another class of integrity attacks that impose less requirements on the attacker compared with false data injection attacks. In this research series, we studied the impact of such time delay attacks on frequency control, voltage control, power plant process control, and electricity real-time pricing.

Teaching

  • 2021 Fall: CE/CZ4023 Advanced Computer Networks, AI6128 Urban Computing, CE3005/CZ3006 Computer Networks/Net-Centric Computing (Tutorial)
  • 2021 Spring: CE/CZ4171 IoT Communications and Networking, CE3005/CZ3006 Computer Networks/Net-Centric Computing (Tutorial)
  • 2020 Fall: CE3005/CZ3006 Computer Networks/Net-Centric Computing, CE/CZ4023 Advanced Computer Networks, AI6128 Urban Computing
  • 2020 Spring: CE3005/CZ3006 Computer Networks/Net-Centric Computing (Tutorial)
  • 2019 Fall: CE3005/CZ3006 Computer Networks/Net-Centric Computing, CE/CZ4023 Advanced Computer Networks
  • 2019 Spring: CZ1012 Engineering Math (Tutorial), CZ3006 Net-Centric Computing (Tutorial)
  • 2018 Fall: CE3006 Digital Communications, CE/CZ4023 Advanced Computer Networks, CZ1012 Engineering Math (Tutorial)
  • 2018 Spring: CE3006 Digital Communications, CZ1012 Engineering Math (Tutorial)
  • 2017 Fall: CE3006 Digital Communications
  • 2017 Spring: CE3006 Digital Communications, CZ1012 Engineering Math (Tutorial), CE3002 Sensor-Interfacing-Control (Tutorial)
  • 2016 Fall: CE3006 Digital Communications
  • 2016 Spring: CZ1012 Engineering Math (Tutorial), CE3002 Sensor-Interfacing-Control (Tutorial)

Professional services

  • Editorship
    • Associate Editor, ACM Transactions on Sensor Networks (TOSN)
    • Associate Editor, Frontier in Communications and Networks (Section: IoT and Sensor Networks)
  • Conference chairs
    • Publication Co-Chair, CPS-IoT Week 2022
    • Finance Chair, ACM SenSys and ACM BuildSys 2021
    • Workshop Co-Chair, BuildSys 2020
    • Poster+Demo Co-Chair, IoTDI 2020
    • Finance Chair of ICDCS, 2020
    • Joint Finance Chair of ACM SenSys and ACM BuildSys, 2019
    • Co-Chair, The 2nd Fog Computing+ Workshop: Trustworthy Fog, 2018
    • Poster Co-Chair, International Conference on Embedded Wireless Systems and Networks (EWSN), 2019
    • Publicity Co-Chair, The 1st IEEE International Conference on Industrial Internet (ICII), 2018
    • Publicity Co-Chair, The 3rd ACM/IEEE International Conference on Internet of Things Design and Implementation (IoTDI), 2018
    • Finance Chair, The 21st IEEE International Symposium on Real-Time Computing (ISORC), 2018
    • Session Chairs for IPSN'20, SenSys'19, IoTDI'19, SenSys'17
  • TPC members
    • IEEE International Conference on Distributed Computing Systems (ICDCS), 2020, 2021
    • ACM Conference on Embedded Networked Sensor Systems (SenSys), 2017, 2019, 2020, 2021
    • ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN), 2017, 2018, 2019, 2020
    • ACM/IEEE International Conference on Internet of Things Design and Implementation (IoTDI), 2017, 2018, 2019, 2020, 2021, 2022
    • IEEE Real-Time Systems Symposium (RTSS), 2013, 2014, 2015, 2016, 2019 (demo)
    • IEEE International Conference on Computer Communications (INFOCOM), 2017, 2018, 2019, 2020, 2021, 2022
    • International Conference on Embedded Wireless Systems and Networks (EWSN), 2017, 2018, 2020 (poster/demo session), 2021
    • IEEE International Conference on Sensing, Communication and Networking (SECON), 2018, 2021
    • Annual International Conference on Distributed Computing in Sensor Systems (DCOSS), 2018
    • IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS), 2019, 2020
    • IEEE International Conference on Parallel and Distributed Systems (ICPADS), 2014, 2015, 2017, 2018, 2019
    • IEEE International Conference on Industrial Internet (ICII), 2018, 2019
    • IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA), 2017, 2021
    • ACM Cyber-Physical System Security Workshop (CPSS), 2015, 2016, 2017, 2022
    • ACM Workshop on Cyber-Physical Systems Security & Privacy (CPS-SPC), 2015, 2016
    • Workshop on Benchmarking Cyber-Physical Systems and Internet of Things (CPS-IoTBench), 2021
    • The 15th ACM Workshop on Wireless Network Testbeds, Experimental evaluation and CHaracterization (WiNTECH'21), with MobiCom'21
  • For university and government
    • Working Group on Development and Operation of Data Centre IT Equipment under Tropical Climate, Green IT Technical Committee, appointed by IMDA, 2021-
    • Data Centre Technical Evaluation Panel member, appointed by IMDA, 04/2021-12/2022
    • Undergraduate Research Experience on Campus (URECA) Coordinator, appointed by NTU/SCSE, 2020/08-2022/07
    • Singapore's Tropical Data Centre Guidelines Working Group member, appointed by IMDA, 2018-2019
  • For K-12
    • 2021 S.T. Yau High School Science Award (Asia), Assessment Panel on Computer Science

(Old) News

  • [06/2021] Our Tropical Data Center 2.0 project is reported by CNA. CNA news
  • [05/2021] Our IPSN'21 paper won the Best Artifact Award Runner-Up! Check out the paper and research data.
  • [02/2021] Green Data Centre tech primer is online.
  • [12/2020] Join the Editorial Board of ACM Transactions on Sensor Networks as an Associate Editor.
  • [04/2020] NTU IoT Sensing Group website is online.
  • [04/2020] Appreciated as Distinguished TPC Member of INFOCOM'20.
  • [07/2019] Our paper on air free-cooled data centers in tropics is accepted to BuildSys'19. The paper receives (highly) positive comments from all Reviewers!
  • [07/2019] Our paper on counteracting adversarial example attacks on deep visual sensing is accepted to SenSys'19.
  • [02/2019] Two papers accepted to IoTDI and ICCPS of CPS-IoT Week 2019!
  • [02/2019] Two papers on exploiting indoor powerline radiation presented at / accepted by MobiCom'18 and MobiCom'19!
  • [09/2018] We use a smartphone to emit a 2 milliseconds inaudible chirp and record audio for just 0.1 seconds to recognize a room. The paper will be presented on Ubicomp'18.
  • [11/2017] Our paper on using LoRaWAN to build control plane for multi-hop wireless networks is accepted to INFOCOM'18.
  • [07/2017] Our paper on using skin electric potentials to synchronize the clocks of wearables is accepted to SenSys'17!
  • [04/2017] Our IPSN'17 paper won the Best Paper Award! In this research, we show that the electromagnetic radiation from powerlines contains time information with errors down to 50 milliseconds.
    Photo NTU/SCSE news Illinois news
  • [04/2017] Our CPSR-SG'17 paper won the Best Paper Award! NTU/SCSE news
  • [01/2017] Appreciated as Distinguished TPC Member of INFOCOM'17.
  • [08/2016] Our paper on secure clock synchronization is accepted to RTSS'16. Our system achieves 0.1ms sync error for two nodes 10km apart and is provably secure against the packet delay attack!
  • [05/2016] ADSC Communications about our PopSeCo project: ADSC research to enhance cybersecurity in energy systems.
  • [01/2016] Our paper on attacks against power grid electricity generation control system is accepted to ICCPS'16. In this work, we really attacked a generator of a microgrid to deviate the 50Hz system frequency.
  • [12/2015] Story about my research: ADSC's Cybersecurity Research Tackles Big Smart Grid Problems (Illinois version)

Invited talks

  1. "Experiences and Learned Lessons from an Air Free-Cooled Tropical Data Center Testbed", IEEE PES Day 2021, Apr 20, 2021. [video]
  2. "Cyber-Physical Approach to Resilient City-Scale IoT Systems", Department of Computing and Software, McMaster University, October, 2020.
  3. "DeepMTD-Moving Target Defense for Embedded Deep Visual Sensing against Adversarial Examples", Embedded AI Summit, Shenzhen, China, Dec 7, 2019.
  4. "Keynote: Cyber-Physical Approach to Resilient City-Scale IoT Systems", International Conference on Cyber-enabled Distributed Computing and Knowledge Discovery, Guilin, China, Oct 18, 2019.
  5. "Keynote: Cyber-Physical Approach to Resilient City-Scale IoT Systems", The 1st workshop on Low Power Wide Area Networks for Internet of Things, EWSN'19, Beijing, Feb, 2019.
  6. "Keynote: Cyber-Physical Approach to Resilient City-Scale IoT Systems", The DATA: Data Acquisition to Analysis Workshop, SenSys'18, Shenzhen, Nov, 2018.
  7. "Cyber-Physical Approach to Resilient City-Scale IoT Systems", International Workshop on Fog and Edge Computing for Smart Cities, The Chinese University of Hong Kong, November, 2018.
  8. "Deep Room Recognition Using Inaudible Echos", NTU-PKU Joint Workshop on IoT Meets AI, Nanyang Technological University, October, 2018.
  9. "Resilient Cyber-Physical Systems by Advanced Sensing and Computing", International Workshop on Next-Generation Cyber-Physical Systems, University of Virginia, September, 2018.
  10. "Resilient Cyber-Physical Systems by Advanced Sensing and Computing", Department of Computer Science, City University of Hong Kong, June, 2017.
  11. "Wireless Sensor Networks for Volcano Monitoring", Earth Observatory of Singapore (EOS), Oct 18, 2016.
  12. "Worst-Cast Resilience Analysis Enabled by Smart Grid Modeling", lecture on Summer School of The French-Singaporean Network in Renewable Energy (CNERGIE), July, 2016, Porticcio, Corsica, France.

Outreach talks

  1. "Tropical Data Centre Proof-of-Concept", Towards Green Data Centres with AI, September 19th, 2019, SGTech, Singapore.
  2. "Transforming Data Centre Operations and Management with AI", Singapore Cloud & Datacenter Convention, July 11th, 2019, Singapore.
  3. "Tropical Data Centre Proof-of-Concept", Industry Sharing Session on BCA-IMDA Green Mark for New and Existing Data Centres, July 3rd, 2019, Singapore.
  4. "Tropical Data Centre Proof-of-Concept", Singapore Digital Industry Day, November 22nd, 2018.