Events

Seminar on "Image and Video Restoration and Benchmarking in Bitstream Corruptions" by Dr Yi Wang

Date: 10 November 2023, Friday Time: 4:30 PM Venue: CD634, The Hong Kong Polytechnic University Zoom Meeting ID: 270 294 7238 Password: 123456 Speaker: Dr Yi Wang, The Hong Kong Polytechnic University   Image and Video Restoration and Benchmarking in Bitstream Corruptions Dr Yi Wang, The Hong Kong Polytechnic University   Abstract: Image and video restoration is a long-standing problem in computer vision, which aims to recover or improve the image/video quality that has been degraded by various corruptions such as noise, blur, and compression artifacts. The restoration methods can also be used to recover crucial visual information for digital forensics and make AI-based vision robust to common corruptions. In this talk, we investigate a real-world image and video restoration problem with bit errors on the encoded bitstream due to unreliable communication channels or physical damage of storage medium. The bitstream corruptions cause complicated and unpredictable error patterns in the pixel domain, such as image block misalignment, blocking artifacts, color artifacts, ghosting effect, content loss, and novel combinations of those, which cannot be addressed by existing techniques trivially. We will present our recent studies on bitstream-corrupted image/video restoration and benchmarking.   Speaker’s Bio: Dr. Yi Wang received the BEng in Electronic and Information Engineering and MEng in Signal and Information Processing from Northwestern Polytechnical University, China, and earned PhD in the School of Electrical and Electronic Engineering from Nanyang Technological University, Singapore, in 2021. He is currently a Research Assistant Professor in the Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hong Kong. He has published more than 20 papers in journals and international conferences, including IEEE Transactions (e.g., IEEE TIP, TCSVT, TNNLS, and TMM), CVPR, and NeurIPS. He worked as a Research Fellow in Nanyang Technological University, Singapore, from 2021 to 2023. His research interest includes Image/Video Processing, Computer Vision, Machine Learning, and Digital Forensics. He is IEEE Member. He served as Associate Editor of The Visual Computer.

Seminar on "Security Concerns in Islands With High Renewables Penetration” conducted by Prof Nikos Hatziargyriou

Date:  8 November 2023, Wednesday Time:  4:00 pm Venue: Room CD303, Department of Electrical and Electronic Engineering, PolyU  Speaker: Prof Nikos Hatziargyriou

Seminar on "Harnessing the Power of Light: The Journey of Distributed Fiber Optic Sensors" by Dr Huan Wu

Date: 3 November 2023, Friday Time: 4:30pm Venue: CD634, The Hong Kong Polytechnic University Zoom Meeting ID: 270 294 7238 Password: 123456 Speaker: Dr Huan Wu, The Hong Kong Polytechnic University   Harnessing the Power of Light: The Journey of Distributed Fiber Optic Sensors Dr Huan Wu, The Hong Kong Polytechnic University   Abstract: Optical fiber, one of the top innovations in twentieth century, is a ubiquitous technology that powers a vast global network, providing high-speed, low latency Internet connectivity. Though widely known for its communication capabilities, optical fiber has another important application in the form of optical fiber sensors (OFSs). Traditional point sensors, which measure a single point or a small area, often fail to provide comprehensive data over large areas. To address this limitation, the concept of distributed fiber optic sensors (DFOSs) was introduced. DFOSs facilitate continuous, real-time monitoring of physical parameters along the entire length of the fiber, achieving a constant flow of data over expansive areas. This unique attribute makes DFOSs ideal for the surveillance of large structures such as pipelines, bridges, and dams, where abnormal or damages may span a significant distance. This talk will present the basic principles of DFOSs and explore some of their applications in industry.   Speaker’s Bio: Dr. Huan Wu received a B. Eng. Degree from Nanjing University of Aeronautics and Astronautics in 2013, followed by a Ph.D. degree from the Chinese University of Hong Kong (CUHK) in 2018. Serving as a postdoctoral fellow in the Department of Electronic and Information Engineering (EIE) at HK PolyU from 2018 to 2020 and later in the Department of Land Surveying and Geoinformatics (LSGI) at HK PolyU from 2020 to 2022, she currently is Research Assistant Professor in the Department of Electrical and Electronics Engineering (EEE). Her research interests include distributed fiber optic sensors and their applications. Dr. Wu has published over 20 papers on IEEE Communications Magazine, IEEE Transactions on Instrumentation and Measurement (TIE), IEEE Journal of Lightwave Technology (JLT), Optics Express (OE) etc. She also serves as a technical consultant for Water Supplies Department (WSD), The Hong Kong SAR Government.

Seminar on "To Reduce Power Outage Risk: Cascading Failure Modeling and Analysis in Modern Power Grids" by Dr Dong Liu

Date: 27 October 2023, Friday Time: 4:30pm Venue: YEUNG Building B5-207, City University of Hong Kong Zoom Meeting ID: 967 1968 0176 Password: 123456 Speaker: Dr Dong Liu, City University of Hong Kong   To Reduce Power Outage Risk: Cascading Failure Modeling and Analysis in Modern Power Grids Dr Dong Liu, City University of Hong Kong   Abstract: Power outages have a catastrophic impact on modern society, disrupting daily routines, causing economic losses, and even threatening public safety. A series of historical blackout events have demonstrated that millions of residences have to live without electricity for a certain period when large-scale systems disturbance occurred. To reduce outage risk in increasingly complex power grids, a great deal of effort has been devoted to cascading failure modeling and analysis over the past few decades. Cascading failure process, where an initial failure triggers a sequence of subsequent failure events and eventually leads to a large-scale blackout. This seminar will discuss cascading failure modeling and analysis in future grids considering the deepened cyber coupling and increased penetration of power electronics. In light of the 2015 Ukraine power outage incident, which confirmed the possibility of power grids being targeted by cyber attacks, we propose an integrated modeling framework for assessing the robustness of cyber-coupled power grids against cascading failure. Our study demonstrates that cyber networks can help mitigate cascading failure, but faults in the cyber layer can also intensify the failure cascade and lead to catastrophic power outages. To better understand the 2019 England power outage event, which was linked to the high penetration of power electronics brought by renewable resources, we proposed a modeling framework that incorporates the dynamical process of frequency control to assess the robustness of high renewable resources-penetrated power systems. Our findings, based on this framework, indicate that the level of renewable energy penetration increases the risk of power outages, emphasizing the need for adequate protective measures.   Speaker’s Bio: Dong Liu graduated from Hong Kong Polytechnic University with BSc(Hons) and PhD degrees in 2015 and 2019, respectively. He worked briefly as a postdoc with the Institute of Textile and Clothing at PolyU, and is presently a postdoc at CityU EE department. His interests include power system robustness and complex network applications.

PolyU Information Day 2023 (Undergraduate and Taught Postgraduate Programmes)

Date 21 Oct 2023 Organiser Academic Registry   Time 10:00 - 17:00 Venue PolyU (Podium, CF Wing)   URL https://www.polyu.edu.hk/infoday     The PolyU Information Day for Undergraduate and Taught Postgraduate Programmes will be held on 21 October 2023 (Saturday) from 10:00 am to 5:00 pm at the PolyU campus. The Department of Electrical and Electronic Engineering’s booth is located at the podium in CF Wing. You are welcome to visit our booth for consultation about EEE’s progammes and join the following activities: Info Seminars   Time BEng (Honours) Scheme in Electrical Engineering 11:00 am – 11:45 am 2:00 pm – 2:45 pm BEng (Honours) / BSc (Honours) Scheme in Information and Artificial Intelligence Engineering 1:00 pm – 1:45 pm 4:00 pm – 4:45 pm MSc in Electrical Engineering 12:00 noon – 12:45 pm MSc in Electric Vehicles MSc in Electronic and Information Engineering 3:00 pm – 3:45 pm   Laboratory Tour A   Time BEng (Honours) Scheme in Electrical Engineering 10:00 am – 11:00 am 12:00 pm – 1:00 pm 3:00 pm – 4:00 pm MSc in Electrical Engineering MSc in Electric Vehicles Laboratory Tour B   Time BEng (Honours) / BSc (Honours) Scheme in Information and Artificial Intelligence Engineering 10:00 am – 11:00 am 2:00 pm – 3:00 pm 3:00 pm – 4:00 pm MSc in Electronic and Information Engineering   If you are interested in the Info Day, please register online at https://www.polyu.edu.hk/study/events/infoday/register. For more details about the Info Day, please visit https://www.polyu.edu.hk/study/events/infoday.

Seminar on "Structure and Function of Hypergraph Based High-order Networks" by Prof. Zi-Ke Zhang

Date: 20 October 2023, Friday Time: 4:30pm Venue: YEUNG Building B5-207, City University of Hong Kong Zoom Meeting ID: 967 1968 0176 Password: 123456 Speaker: Prof. Zi-Ke Zhang, Zhejiang University, Hangzhou   Structure and Function of Hypergraph Based High-order Networks Prof. Zi-Ke Zhang, Zhejiang University, Hangzhou   Abstract: Hypergraph, as one of the most representative paradigm to describe wide-range high-order interactions, has provided a versatile yet powerful tool to illustrate a vast class of unsolved or incompletely described questions in complex networks. In this talk, I would like to briefly introduce the concept, methods, as well as our recent advances in evolution of scientist collaboration, information maximization and possible extensions, i.e. human pose estimation.   Speaker’s Bio: Zi-Ke Zhang receoved his Ph.D in Information Physics in 2011 from the University of Fribourg, Switzerland. He is serving as a full professor at College of Media and International Culture, Zhejiang University. Before that, he was a full professor at the Research Center for Complexity Sciences at Hangzhou Normal University. His main research interests is the interdisciplinary area of data- and model-driven social computing oriented research questions, He has published more than 100 peer-reviewed journal papers with more than 5600 times from Google Scholar. He was also selected as a Zhejiang Provincial Young academic Leader (2017), and Outstanding Teacher of Zhejiang Province (2018).

Seminar on "Programmable Photonic Circuits for Artificial Neural Networks and Quantum Machine Learning" by Dr Hui Zhang

Date: 13 October 2023, Friday Time: 4:30pm Venue: CD634, The Hong Kong Polytechnic University Zoom Meeting ID: 270 294 7238 Password: 123456 Speaker: Dr Hui Zhang, Hong Kong Polytechnic University   Programmable Photonic Circuits for Artificial Neural Networks and Quantum Machine Learning Dr Hui Zhang, Hong Kong Polytechnic University   Abstract: Photonic neural networks is a revolutionary paradigm in the field of artificial intelligence, harnessing the power of photonics to accelerate the computational speed and energy efficiency of neural networks to previously unimaginable levels. This talk introduces the chip design, algorithm innovation, and applications of silicon-based on-chip photonic neural networks. To give full play to the advantages of photonic computing, a complex-valued neural network architecture with high prediction accuracy, fast convergence and nonlinear decision boundaries, as well as an online training method, was proposed. Subsequently, a photonic quantum autoencoder with single-shot online training is demonstrated, which achieves successful application in the high-dimensional quantum subspace teleportation. On-chip photonic neural networks promise to unlock new frontiers in high-performance computing, enabling advancements in fields such as autonomous driving, medical diagnosis, and quantum computing.   Speaker’s Bio: Dr Hui Zhang is currently a research assistant professor with The Hong Kong Polytechnic University. She received the B.Eng. degree from Xi’an Jiaotong University, China and the Ph.D. degree from Nanyang Technological university, Singapore. Her research interests include photonic neural networks, quantum machine learning and AI in science. In recent years, she has developed the complex-valued photonic neural network architecture, gradient-free on-chip training method, and the quantum autoencoder facilitated teleportation protocol. Her works are published on Science Advances, Nature Communications, Laser & Photonics Reviews, PRX Quantum etc.

Seminar on "Mitigating Cascading Failure in Power Networks Based on Deep Reinforcement Learning" by Dr Xi Zhang

Date: 6 October 2023, Friday Time: 4:30pm Venue: YEUNG Building Y5-303, City University of Hong Kong Zoom Meeting ID: 967 1968 0176 Password: 123456 Speaker: Dr Xi Zhang, Beijing Institute of Technology, Beijing   Mitigating Cascading Failure in Power Networks Based on Deep Reinforcement Learning Dr Xi Zhang, Beijing Institute of Technology, Beijing   Abstract: Power grids are susceptible to cascading failures, which can have catastrophic consequences for modern society. Remedial actions, such as proactive islanding, generator tripping, and load shedding, offer a viable solution to mitigate cascading failures in power grids. The key to the success of this solution lies in generating timely and appropriate remedial actions during the rapid propagation process of cascading failure. This presentation introduces an intelligent method that leverages deep reinforcement learning to generate remedial actions. A simulation model of cascading failure is presented, considering power flow distributions and the probabilistic failure mechanisms of components to accurately depict the dynamic cascading failure process. Based on this model, a Markov decision process is formulated to address the problem of selecting appropriate remedial actions during the cascading failure process. The Proximal Policy Optimization algorithm is utilized to generate effective remedial actions. Experiments are conducted on representative power test cases, and the results demonstrate the proposed method’s ability to significantly reduce the affected area in the event of the same initial failure, thereby showcasing its advantages in mitigating cascading failure in power grids.   Speaker’s Bio: Dr Xi Zhang received the BEng degree in Automation from Beijing Jiaotong University, Beijing, China, in 2013, and the PhD degree in Electronic and Information Engineering from The Hong Kong Polytechnic University, Hong Kong SAR, China, in 2017. He is currently an assistant professor at the School of Automation, Beijing Institute of Technology, Beijing, China. His research interests focus on power system resilience, application of AI technologies to the analysis and decision-making in power networks, etc. He is an Associate Editor for IEEE Transactions on Circuits and Systems II: Express Briefs. He served as a Guest Editor for IEEE Journal on Emerging and Selected Topics in Circuits and Systems in 2023 and the secretary of the IEEE PES Beijing Chapter from 2018 to 2019.

Seminar on "UAV-Enabled Intelligent Transportation Systems (ITS) for Smart Cities" by Prof. Simon Pun

Date: 22 September 2023, Friday Time: 10:30am Venue: CD634, The Hong Kong Polytechnic University Zoom Meeting ID: 383 735 6917 Password: 274320 Speaker: Prof. Simon Pun, The Chinese University of Hong Kong (Shenzhen Campus)   UAV-Enabled Intelligent Transportation Systems (ITS) for Smart Cities Prof. Simon Pun, The Chinese University of Hong Kong (Shenzhen Campus)   Abstract: Intelligent transportation systems (ITS) is one of the defining components for smart cities. Thanks to their flexible mobility, autonomous operation, and outstanding communication capabilities, Unmanned Aerial Vehicles (UAV) have been well envisaged as one of the most promising technologies for future ITS. In this talk, the latest development of UAV-enabled ITS will be first reviewed with emphasis on the effective integration of UAV and Unmanned Ground Vehicles (UGV) in ITS. After that, some of our recent works on three research topics, namely the UAV-enabled UGV path planning, UAV-enabled aerial-ground communication networks and autonomous UAV landing, will be elaborated in depth. In this talk, we will extensively use videos to demonstrate the systems we have designed and implemented.   Speaker’s Bio: Dr. Simon Pun received his Bachelor degree from the Chinese University of Hong Kong (CUHK), Master degree from the University of Tsukuba, Japan and Ph.D. degree from University of Southern California (USC) in Los Angeles, U.S.A., respectively. He was a post-doctoral research associate at Princeton University, U.S.A from 2006 to 2008. Before he joined the Chinese University of Hong Kong, Shenzhen (CUHKSZ) in 2015, he held research positions at Huawei in NJ, U.S.A, the Mitsubishi Electric Research Labs (MERL) in Boston, U.S.A, and Sony in Tokyo, Japan. He is currently an Associate Professor with the School of Science and Engineering, CUHKSZ. His research interests include artificial intelligence (AI) Internet of Things (AIoT) and applications of machine learning in communications and satellite remote sensing. Prof. Pun has received best paper awards from the IEEE Vehicular Technology Conference 2006 Fall, the IEEE International Conference on Communication 2008, and the IEEE Infocom’09. He is the Founding Chair of the IEEE Joint Signal Processing Society-Communications Society Chapter, Shenzhen. He served as an Associate Editor for the IEEE Transactions on Wireless Communications from 2010 to 2014.

Seminar on "Resilience of Multimodal Public Transportation Infrastructure systems in Hong Kong" by Prof. Shauhrat Chopra

Date: 15 September 2023, Friday Time: 4:30 PM Venue: YEUNG Building Y5-303, City University of Hong Kong Zoom Meeting ID: 967 1968 0176 Password: 123456 Speaker: Prof. Shauhrat Chopra, City University of Hong Kong   Resilience of Multimodal Public Transportation Infrastructure systems in Hong Kong Prof. Shauhrat Chopra, City University of Hong Kong   Abstract: Cities worldwide are striving to enhance their resilience in order to withstand extreme weather events such as floods, storms, and extreme temperatures associated with climate change. Concurrently, these cities are aggressively pursuing their sustainability and climate change mitigation targets. This necessitates a rethinking of urban planning and a re-engineering of infrastructure systems in the urban built environment to ensure long-term sustainability and short-term resilience. In this talk, I will discuss resilience and sustainability of interconnected and interdependent infrastructure systems in the context of the multimodal urban public transport system. As it is one of the critical infrastructure systems, any disruption on the public transportation system, even if partial, could have a debilitating impact on a city’s health, security, and economy. The public transport system in Hong Kong, for example, accounts for 90% of passenger trips in a day, and any disruption could have catastrophic cascading impacts on the city’s economic and social interactions. This is particularly concerning considering the increasing instances of climate change-induced extreme weather events. A multi-dimensional quantitative resilience assessment framework, called the ‘Resilience Cycle’ will be discussed in the context of the Hong Kong public transport system. The utility of this framework in offering insights for improving the resilience of Hong Kong’s transportation system to disruptions will be discussed, while also considering its adaptability towards sustainable infrastructure. The talk will discuss the use of systems modelling approaches, such on network analysis and GIS, and tools like life cycle assessment (LCA) to address the potential trade-offs between resilience and sustainability in decision-making. Finally, I will stress the applicability of our findings from the study of resilient multimodal public transport systems in Hong Kong to the broader realm of real-world critical infrastructure systems.   Speaker’s Bio: Dr. Shauhrat S. Chopra is an Assistant Professor at the School of Energy and Environment (SEE), City University of Hong Kong (CityU). He received his PhD in Civil and Environmental Engineering from the Swanson School of Engineering at the University of Pittsburgh, USA, in 2015. Chopra’s doctoral dissertation was focused on resilience of complex systems, including economic systems, industrial symbiosis, and critical infrastructure systems at urban and national levels. Before joining SEE, he also worked as a Postdoctoral Researcher at the Institute for Environmental Science and Policy, University of Illinois at Chicago, on the U.S. EPA-funded project focused on sustainable design of future transformative emerging technologies. At CityU, his data-driven research is focused on designing indicators for sustainability and resilience of the built environment in support of environmental decision-making.