BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Department of Electrical and Computer Engineering (HKUECE) 電機與計算機工程系 - ECPv6.16.2//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Department of Electrical and Computer Engineering (HKUECE) 電機與計算機工程系
X-ORIGINAL-URL:https://ece.hku.hk
X-WR-CALDESC:Events for Department of Electrical and Computer Engineering (HKUECE) 電機與計算機工程系
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Asia/Hong_Kong
BEGIN:STANDARD
TZOFFSETFROM:+0800
TZOFFSETTO:+0800
TZNAME:HKT
DTSTART:20220101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Asia/Hong_Kong:20230803T111500
DTEND;TZID=Asia/Hong_Kong:20230803T130000
DTSTAMP:20260515T212417
CREATED:20250224T023748Z
LAST-MODIFIED:20250224T023748Z
UID:109902-1691061300-1691067600@ece.hku.hk
SUMMARY:Seminar - Qusai-Single-Stage Current Fed Resonant AC-DC Converter Having Improved Heat Distribution
DESCRIPTION:Zoom Link: https://hku.zoom.us/j/94898976823?pwd=K1NlUldEZUtzOGlqbUtzUDlZMjNHQT09\nMeeting ID: 948 9897 6823\nPassword: 03082023 \nAbstract\nIn the seminar\, I will present one of my previously published works. This work presents a quasi-single-stage current-fed resonant ac-dc converter having improved heat distribution. Secondary-side switches are turned off with a voltage close to zero at high instantaneous power and with a voltage close to half of the output voltage at low instantaneous power. Switching losses at the primary-side bottom switches are reduced; this change improves the heat distribution over the switches. The primary-side duty-cycle fixed at 0.5 results in negligible input current ripple; this trait can significantly reduce the size of the filter inductor at the grid side. Experimental results show the effectiveness of the proposed ac-dc converter and its improved heat distribution against a conventional solution. \nBiography of the Speaker\nWaqar Uddin was born in Upper Dir\, Khyber Pakhtunkhwa\, Pakistan in 1989. He received his B.S. degree in Electrical Power Engineering from COMSATS University Islamabad\, Pakistan in 2013\, and his Ph.D. degree in 2020 from Pusan National University\, Busan\, South Korea. \nHe worked as a Postdoctoral Researcher at Dongguk University\, Seoul\, South Korea in 2020/2021. He also worked as a Lecturer at the University of Management & Technology\, Lahore Pakistan from 2016 to 2018. Currently\, he is with the National University of Technology (NUTECH)\, Islamabad\, Pakistan\, where he serves as an Assistant Professor. \nHe has published 60 research and review articles in reputable journals and international conferences with a cumulative impact factor of 170+.  His work has been cited 1300+ times having an h-index of 19 and an i-10 index of 28 according to google scholar. \nHis research interests include power converters design and control\, grid-connected converters\, electric drives\, and integration of renewable energies into the grid.
URL:https://ece.hku.hk/events/seminar-qusai-single-stage-current-fed-resonant-ac-dc-converter-having-improved-heat-distribution-2/
LOCATION:Online via Zoom
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/02/Seminar-s-banner.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Hong_Kong:20230807T140000
DTEND;TZID=Asia/Hong_Kong:20230807T153000
DTSTAMP:20260515T212417
CREATED:20250224T023525Z
LAST-MODIFIED:20250224T024011Z
UID:109900-1691416800-1691422200@ece.hku.hk
SUMMARY:Seminar - Quantum Induced Coherence Light Detection and Ranging
DESCRIPTION:Abstract\nQuantum illumination has been proposed and demonstrated to improve the signal-to-noise ratio (SNR) in light detection and ranging (LiDAR). When relying on coincidence detection\, such a quantum LiDAR is limited by the response time of the detector and suffers from jamming noise. Inspired by the Zou-Wang-Mandel experiment\, we design\, construct and validate a quantum induced coherence (QuIC) LiDAR which is inherently immune to ambient and jamming noises. In traditional LiDAR the direct detection of the reflected probe photons suffers from deteriorating SNR for increasing background noise. In QuIC LiDAR we circumvent this obstacle by only detecting the entangled reference photons\, whose single-photon interference fringes are used to obtain the distance of the object\, while the reflected probe photons are used to erase path information of the reference photons. In consequence\, the noise accompanying the reflected probe light has no effect on the detected signal. We demonstrate such noise resilience with both LED and laser light to mimic the background noise and jamming attack. The proposed method paves a new way of battling noise in precise quantum electromagnetic sensing and ranging. \nBiography of the Speaker\nDa-Wei Wang received his Bachelor’s degree from Tongji University in 2006 and Ph.D degree in physics from the Chinese University of Hong Kong in 2012. He worked as Postdoc\, Research Assistant Professor and Research Associate Professor in Texas A&M University from 2012 to 2017\, and then joined Zhejiang University as a Professor. His research focuses in quantum simulation in atom-photon coupled systems\, and optical sensing with quantum light. He published more than 60 papers in peer reviewed journals\, including 2 Science\, 1 Nat. Phys.\, 1 Nat. Photon.\, 1 Nat. Nanotechnol. and 15 PRL papers. He was supported by NSFC Key Program and National Key Research and Development Program. \nOrganiser\nProf. Z. Chu \nAll are welcome!
URL:https://ece.hku.hk/events/seminar-quantum-induced-coherence-light-detection-and-rangingquantum-illumination-has-been-proposed-and-demonstrated-to-improve-the-signal-to-noise-ratio-snr-in-light-detection-and-ranging-lidar/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/02/Seminar-s-banner.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Asia/Hong_Kong:20230811T143000
DTEND;TZID=Asia/Hong_Kong:20230811T160000
DTSTAMP:20260515T212417
CREATED:20250224T023233Z
LAST-MODIFIED:20250224T023321Z
UID:109896-1691764200-1691769600@ece.hku.hk
SUMMARY:Emerging opportunities in optical microresonators: fundamentals and applications
DESCRIPTION:Abstract\nLight-matter interactions are the fundamental basis for many phenomena and processes in optical devices. This talk will cover ultra-high-quality whispering-gallery-mode (WGM) optical microresonators\, which provide an unprecedented capability to trap light in a highly confined volume smaller than a strand of human hair. Light beams can travel around the boundary of a WGM resonator over 10^6 times\, significantly enhancing light-matter interactions and creating the potential for a wealth of new scientific discoveries and technological breakthroughs. High-Q microresonators and microlasers have great potential for both fundamental science and engineering applications; the choices of materials for the photonic resonators enable various opportunities for different applications. Examples range from low-threshold lasers to parity-time-symmetric resonators and their application for sensing and nonreciprocal light transmission. I will review our recent exploration non-Hermitian physics that has unravelled innovative strategies to achieve a new generation of optical systems enabling unconventional control of light flow\, such as loss engineering in a lasing system\, directional lasing emission\, and EPs enhanced sensing. I will also reveal the discovery of mechanical solitons through optomechanical effects in a microtoroid resonator.  I will conclude my talk with a new finding in EP-enhanced sensing that can expand this approach to a wide range of optical sensor systems. Our research discoveries represent a glimpse of the potential of photonic resonators; there are still many exciting opportunities by leveraging the enhanced light-matter interactions through resonant effects in the future. \nSpeaker\nProf. Lan Yang\nPreston M. Green Department of Electrical and Systems Engineering\,\nWashington University in St. Louis \nBiography of the Speaker\nProfessor Lan Yang is the Edwin H. and Florence G. Skinner professor in the Preston M. Green Department of Electrical and Systems Engineering at Washington University in St. Louis. She is also the editor-in-chief of Photonics Research. She received a B.S. from the University of Science and Technology of China and received her Ph.D. in applied physics from Caltech in 2005. Her research interests have been focusing on the fundamental understanding of light-matter interactions and their applications. She enjoys investigating physics in various types of high-quality photonic resonators and exploring their applications for sensing\, lasing\, light harvesting\, and communications. Her research in parity-time-symmetry and non-Hermitian physics in high-quality resonators have led to a series of new discoveries for unconventional control of light transport in photonic structures. Recently\, her research interests expanded to hybrid optoelectronic systems including flat optics modified CMOS imaging sensors for multimodality sensing applications. She received the NSF CAREER Award in 2010 for her work on single nanoparticle detection and sizing using an on-chip optical resonator. She also received the 2010 Presidential Early Career Award for Scientists and Engineers (PECASE). She is a Fellow of OSA (Optical Society of America)\, IEEE (Institute of Electrical and Electronics Engineers)\, APS (American Physical Society)\, and AAAS (American Association for the Advancement of Science). \nOrganiser\nFaculty of Engineering \n  \nAll are welcome.
URL:https://ece.hku.hk/events/emerging-opportunities-in-optical-microresonators-fundamentals-and-applications/
LOCATION:Tam Wing Fan Innovation Wing Two\, G/F\, Run Run Shaw Building\, The University of Hong Kong
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/02/Seminar-s-banner.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230816
DTEND;VALUE=DATE:20230817
DTSTAMP:20260515T212417
CREATED:20230810T080043Z
LAST-MODIFIED:20250114T095847Z
UID:17570-1692144000-1692230399@ece.hku.hk
SUMMARY:High-performance Perovskite Optoelectronic Devices via Defect Passivation and Potential Career Development Opportunities at Huaqiao University
DESCRIPTION:Metal halide perovskites are emerging as promising optoelectronic materials with advantages like easy solution-based fabrication\, low material cost\, high defect tolerance\, and high PLQY. The MHPs have shown great potential in applications like LEDs and solar cells. \nAs for the perovskite LEDs\, before 2016\, it was highly challenging to prepare a high-quality perovskite emitting layer by the conventional method. The as-prepared perovskite films always show too many pin-holes\, disordered lattices\, and non-radiative defects. As a result\, the corresponding device performance\, especially for the external quantum efficiency (EQE)\, is far behind organic and quantum dot LEDs. Our group has been focusing on perovskite LEDs for years. In 2018\, we prepared a quasi-core-shell structure of CsPbBr3@CH3NH3Br\, passivated the non-radiative defects\, improved the charge injection balance\, and achieved a milestone EQE of over 20%.1 In 2021\, we utilized the TFPPO to tune the crystalline dimension of 2D/3D perovskite\, reducing the defect formation and significantly improving the PLQY. As a result\, we got an impressive EQE of over 25%.2 Moreover\, we will introduce some progress about manipulating crystal growth\, regulating phase composition3\, optimizing device structure\, and lead-free perovskite-based LEDs4. \nAs for the perovskite solar cells (PSCs)\, we have been focused on preparing ultra-pure FAPbI3 active layer5\, synthesis of functional fullerene\, and the application in PSCs\, perovskite/silicon tandem solar cells. Recently\, we successfully boosted the power conversion efficiency to over 25 % with an operational lifetime of over 1\,500 h. \nIn addition to the scientific talk\, Prof. Wei will also discuss potential career development opportunities available at Huaqiao University. Specifically\, he will discuss potential recruitment in the following research directions (including but not limited to): \n\nElectroluminescent materials and devices\, such as Perovskite LED\, QLED\, and OLED.\nNovel photovoltaic materials and devices\, such as perovskite solar cells\, organic solar cells\, and other new photovoltaic devices.\nOptics and device physics and related simulation calculations.\nOther energy optoelectronic-related materials and device applications\, such as photodetectors and high-energy ray detectors.\n\nKeywords: Perovskite\, LEDs\, Solar Cells\, Defect Passivation  \nReference:  \n\nLin\, K.; Xing\, J.; Quan\, L. N.; de Arquer\, F. P. G.; Gong\, X.; Lu\, J.; Xie\, L.; Zhao\, W.; Zhang\, D.; Yan\, C.; Li\, W.; Liu\, X.; Lu\, Y.; Kirman\, J.; Sargent\, E. H.*; Xiong\, Q.*; Wei\, Z.*\, Perovskite light-emitting diodes with external quantum efficiency exceeding 20 percent. Nature 2018\, 562 (7726)\, 245-248.\nMa\, D.; Lin\, K.; Dong\, Y.; Choubisa\, H.; Proppe\, A. H.; Wu\, D.; Wang\, Y.-K.; Chen\, B.; Li\, P.; Fan\, J. Z.; Yuan\, F.; Johnston\, A.; Liu\, Y.; Kang\, Y.; Lu\, Z.-H.; Wei\, Z.*; Sargent\, E. H.*\, Distribution control enables efficient reduced-dimensional perovskite LEDs. Nature 2021\, 599 (7886)\, 594-598.\nLin\, K.; Yan\, C.; Sabatini\, R. P.; Feng\, W.; Lu\, J.; Liu\, K.; Ma\, D.; Shen\, Y.; Zhao\, Y.; Li\, M.; Tian\, C.; Xie\, L.; Sargent\, E. H. *; Wei\, Z. *\, Dual‐Phase Regulation for High‐Efficiency Perovskite Light‐Emitting Diodes. Advanced Functional Materials 2022\,\nLu\, J.; Guan\, X.; Li\, Y.; Lin\, K.; Feng\, W.; Zhao\, Y.; Yan\, C.; Li\, M.; Shen\, Y.; Qin\, X.; Wei\, Z.*\, Dendritic CsSnI3 for Efficient and Flexible Near-Infrared Perovskite Light-Emitting Diodes.  Mater. 2021\, 33 (44)\, 2104414.\nXie\, L.; Lin\, K.; Lu\, J.; Feng\, W.; Song\, P.; Yan\, C.; Liu\, K.; Shen\,L.; Tian\, C.; Wei\, Z.*\, Efficient and Stable Low-Bandgap Perovskite Solar Cells Enabled by a CsPbBr3-Cluster Assisted Bottom-up Crystallization Approach.  Am. Chem. Soc. 2019\, 141\, 20537.\n\nBiography of the speaker: \nZhanhua Wei is a full-time professor at the Institute of Luminescent Materials and Information Displays\, College of Materials Science and Engineering\, Huaqiao University\, China. He received his B.S. degree in 2011 from the Department of Chemistry\, Xiamen University\, China\, and his Ph.D. in 2015 from Prof. Shihe Yang’s group\, Department of Chemistry\, Hong Kong University of Science and Technology\, China. After postdoc research with Prof. Qihua Xiong at Nanyang Technological University\, he joined Huaqiao University as a principal investigator in May 2016. His current research focuses on perovskite light-emitting diodes\, solar cells\, and other optoelectronic materials and devices. He has published over 80 peer-reviewed papers in scientific journals like Nature\, J. Am. Chem. Soc. and Adv. Mater. \nProf. Wei is the Dean of the Institute of Luminescent Materials and Information Displays\, Vice-dean of the College of Materials Science and Engineering at Huaqiao University. \nAll are welcome.
URL:https://ece.hku.hk/events/high-performance-perovskite-optoelectronic-devices-via-defect-passivation-and-potential-career-development-opportunities-at-huaqiao-university/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/02/Seminar-s-banner.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230823
DTEND;VALUE=DATE:20230824
DTSTAMP:20260515T212417
CREATED:20230821T083240Z
LAST-MODIFIED:20250114T095946Z
UID:17582-1692748800-1692835199@ece.hku.hk
SUMMARY:Theme-Based Research Scheme Wireless Power Transfer – The Next StageAnnual Workshop 2023
DESCRIPTION:
URL:https://ece.hku.hk/events/theme-based-research-scheme-wireless-power-transfer-the-next-stageannual-workshop-2023/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2023/08/head.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230825
DTEND;VALUE=DATE:20230826
DTSTAMP:20260515T212417
CREATED:20230821T063647Z
LAST-MODIFIED:20250114T095919Z
UID:17576-1692921600-1693007999@ece.hku.hk
SUMMARY:Seminar - EdgeGPT: Towards Autonomous Edge AI
DESCRIPTION:It has been envisioned that next-generation wireless networks have to support AI as a Service (AIaaS) as a new application scenario. Leveraging proximate edge computing resources\, edge AI stands out as a promising enabler for AI-based applications on resource-constrained devices at the wireless network edge. Nevertheless\, edge AI is a complex system\, consisting of diverse devices\, heterogeneous computing platforms\, and various network infrastructures\, and thus the design process and system operation are highly complicated. This talk will introduce EdgeGPT as a new framework for autonomous edge AI\, which relies on powerful capabilities of large language models (LLMs). Basics about LLMs\, especially GPT models\, will be firstly introduced. Then it will illustrate how EdgeGPT enables automatic cooperative edge inference and automatic federated learning. \nBiography of the speaker: \nJun Zhang received his Ph.D. degree in Electrical and Computer Engineering from the University of Texas at Austin. He is an IEEE Fellow and an IEEE ComSoc Distinguished Lecturer. He is an Associate Professor in the Department of Electronic and Computer Engineering at the Hong Kong University of Science and Technology. His research interests include wireless communications and networking\, mobile edge computing and edge AI\, and cooperative AI. Dr. Zhang co-authored the book Fundamentals of LTE (Prentice-Hall\, 2010). He is a co-recipient of several best paper awards\, including the 2021 Best Survey Paper Award of IEEE Communications Society\, the 2019 IEEE Communications Society & Information Theory Society Joint Paper Award\, and the 2016 Marconi Prize Paper Award in Wireless Communications. Two papers he co-authored received the Young Author Best Paper Award of the IEEE Signal Processing Society in 2016 and 2018\, respectively. He also received the 2016 IEEE ComSoc Asia-Pacific Best Young Researcher Award. He is an Editor of IEEE Transactions on Communications\, and was an editor of IEEE Transactions on Wireless Communications (2015-2020). He served as a MAC track co-chair for IEEE Wireless Communications and Networking Conference (WCNC) 2011 and a wireless communications symposium co-chair of IEEE International Conference on Communications (ICC) 2021. \nAll are welcome.
URL:https://ece.hku.hk/events/seminar-edgegpt-towards-autonomous-edge-ai/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/02/Seminar-s-banner.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230829
DTEND;VALUE=DATE:20230830
DTSTAMP:20260515T212417
CREATED:20230823T024337Z
LAST-MODIFIED:20250114T100025Z
UID:17584-1693267200-1693353599@ece.hku.hk
SUMMARY:Seminar - From Device to System –  can we design power converters without physical boundaries?
DESCRIPTION:From electric vehicles to ICT equipment\, every Watt consumed is converted and controlled by power converters several times from the end to end. It is pivotal for energy saving and decarbonisation that power converters achieve high efficiency\, high reliability\, low cost\, and miniaturization. We will demonstrate a new design paradigm for power converter systems by means of structural and functional integration. Instead of the unilateral serial design process using available components\, we will cohesively design the power device\, packaging\, and control of a power converter. Applications and working progress on integrating the control and packaging design will be given in this talk as well as new magnetic components design. Using printed circuit board (PCB) to replace bonding wires\, new Silicon Carbide (SiC) power device packaging design will be discussed in terms of electromagnetic and thermomechanical performance. A new switching method using the intrinsic electroluminescence of power MOSFETs will demonstrate a self-adaptive zero voltage switching (ZVS) approach. This progress will lead to the final fully integrated and intelligent power converter design we aim to achieve in the foreseeable future. \nBiography of the speaker: \nProf Teng Long has been appointed Lecturer at the University of Cambridge in 2016 then Associate Professor in 2021 and Full Professor (Professor of Power Electronics) in 2022. He established the Advanced Power Electronics Laboratory (The Long Group) in the Department of Engineering and he is currently leading a research team comprised of 3 Postdoctoral Research Associates and 7 PhD students. His research portfolio covers from power electronic devices to power converters to drive and power systems\, mainly for transport electrification and renewable energy applications. Since 2017\, Prof Long has been awarded more than £3 million research grants where half are funded by the UK government and the rest directly from industrial sponsors. Prof Long has built strong connections with industrial partners including the SAIC Motor\, Dynex Semiconductor\, STMicroelectronics\, Siemens\, CBMM\, NIO\, CRRC\, Wuxi SES. \nPrior to joining Cambridge\, he has worked for General Electric (GE) where he has led or played an important role in many rewarding projects such as the first transformer-less all electric oil-platform supply vessel\, the first large scale all electric warship (Type 45 Destroyer)\, and the first electromagnetic aircraft catapult demonstrator. Prof Long established the EPIC Tech Ltd\, a start-up company specializing high density power modules. Since inception\, the company has raised several tens of million RMB venture capital and launched a few products. \nTo date\, Prof Long has more than 80 academic papers published at international journals and he is the inventor of 5 international patents. Prof Long received the B.Eng. from the Huazhong University of Science and Technology\, China\, the first class B.Eng. (Hons.) from the University of Birmingham\, UK in 2009\, and the Ph.D. from the University of Cambridge\, UK in 2013. Prof Long is a Chartered Engineer registered with the UK Engineering Council. \nAll are welcome.
URL:https://ece.hku.hk/events/seminar-from-device-to-system-can-we-design-power-converters-without-physical-boundaries/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/02/Seminar-s-banner.jpg
END:VEVENT
END:VCALENDAR