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X-WR-CALNAME:Department of Electrical and Computer Engineering (HKUECE) 電機與計算機工程系
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X-WR-CALDESC:Events for Department of Electrical and Computer Engineering (HKUECE) 電機與計算機工程系
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TZID:Asia/Hong_Kong
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DTSTART:20250101T000000
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BEGIN:VEVENT
DTSTART;TZID=Asia/Hong_Kong:20260424T110000
DTEND;TZID=Asia/Hong_Kong:20260424T120000
DTSTAMP:20260511T035338
CREATED:20260410T024359Z
LAST-MODIFIED:20260410T024359Z
UID:115568-1777028400-1777032000@ece.hku.hk
SUMMARY:RPG Seminar – From 2D to 3D: Enhancing Ultrasound Resolution through Null Subtraction Beamforming
DESCRIPTION:Zoom Link:\nhttps://hku.zoom.us/j/99658715385?pwd=NaDaq5EIkqa3RYU4pDDYxbz5stbh45.1 \nAbstract\nHigh-frame-rate ultrasound imaging is a cornerstone of modern medical diagnostics and structural monitoring\, yet it remains bound by the classical trade-off between spatial resolution and acquisition speed. While conventional delay-and-sum (DAS) beamforming is the industry standard\, its resolution is fundamentally limited by the transducer’s diffraction pattern. This seminar introduces Null Subtraction Imaging (NSI)\, a nonlinear beamforming strategy designed to surpass these diffraction limits. We begin by establishing the principles of 2D NSI\, where thee apodization windows are used to synthesize a “null” beampattern that effectively sharpens the mainlobe. Building on this foundation\, the talk focuses on the extension of this technique into 3D NSI. We discuss the unique challenges of volumetric imaging\, including the complexity of 2D aperture design and the computational demands of matrix arrays. By leveraging specialized apodization masks and hardware-efficient sampling strategies\, 3D NSI achieves improvements in both azimuthal and elevational resolution\, as well as contrast ratio\, over DAS. The presentation will detail the theoretical framework\, simulation results\, and experimental validation\, demonstrating a scalable path toward high-resolution\, real-time 4D ultrasound imaging. \nSpeaker\nMr Bingze Dai\nDepartment of Electrical and Computer Engineering\nThe University of Hong Kong \nBiography of the Speaker\nBingze Dai received his M.S. in Electrical and Computer Engineering at University of Illinois\, Urbana-Champaign in 2023\, and B.S. in Electronic and Information Engineering at Beijing Institute of Technology in 2019. He is currently pursuing the Ph.D. degree in the Department of Electrical and Computer Engineering at the University of Hong Kong\, with a research focus on ultrasound imaging. \nOrganiser\nProf. Wei-Ning Lee \nDepartment of Electrical and Computer Engineering\, The University of Hong Kong \nAll are welcome.
URL:https://ece.hku.hk/events/20260424/
LOCATION:Room CB-603\, 6/F\, Chow Yei Ching Building\, The University of Hong Kong
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/11/rpg-seminar.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Hong_Kong:20260424T140000
DTEND;TZID=Asia/Hong_Kong:20260424T150000
DTSTAMP:20260511T035338
CREATED:20260414T022321Z
LAST-MODIFIED:20260414T022414Z
UID:115683-1777039200-1777042800@ece.hku.hk
SUMMARY:RPG Seminar – Multi-Dimensional Nano-Printing of Colloidal Quantum Dots for Infrared Optoelectronics
DESCRIPTION:Zoom Link: https://hku.zoom.us/j/92581464035?pwd=APBvw8rHe96aZfdqA9bhiKatjwmjXe.1 \nAbstract\nAdditive manufacturing enables the bottom-up fabrication of tailored and functional optoelectronic devices. However\, realizing printed (opto)electronics with micro- and nanoscale features and multi-dimensional structures remains challenging.\nHere\, we developed electrohydrodynamic (EHD) printing as the platform for the in-situ deposition of sub-micron-resolution colloidal quantum dot (QD) inks from quasi-2D monolayers to 2D lines and films\, and to quasi-3D walls.\nBy optimizing printing parameters\, such as the amplitude and offset of the applied waveform\, as well as the printing speed\, uniform and continuous 2D QD lines with linewidths as small as 300 nm can be obtained without post-processing.\nThen we performed solvent engineering on the QD ink\, enabling printed QDs to form closely packed quasi-2D monolayers and even short-range-ordered hexagonal superlattices. Besides\, by stacking multiple printed 2D lines\, our printer enables the fabrication of quasi-3D QD walls with aspect ratios ranging from 0.25 to 2.\nFinally\, we demonstrate QD patterning with a resolution exceeding 10\,000 dots per inch (dpi) and tunable thickness. The multi-dimensional EHD-printed QD arrays can serve as color-conversion layers for micro-LEDs (thicknesses over 1 μm) and also hold promise as a new solution for the patterning of QD-LED emissive layers (thicknesses less than 100 nm). \nSpeaker\nMr. Zeqi WANG\nDepartment of Electrical and Computer Engineering\nThe University of Hong Kong \nBiography of the Speaker\nZeqi Wang received his BEng in Optoelectronic Information Science and Engineering from Southern University of Science and Technology in 2024. He is currently pursuing an MPhil degree with Prof. Zhao in the Department of Electrical and Computer Engineering\, with a research focus on electrohydrodynamic printing of infrared colloidal quantum dots. \nOrganiser\nProf. Leo Tianshuo ZHAO \nDepartment of Electrical and Computer Engineering\, The University of Hong Kong \nAll are welcome.
URL:https://ece.hku.hk/events/20260424-2/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/11/rpg-seminar.jpg
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BEGIN:VEVENT
DTSTART;TZID=Asia/Hong_Kong:20260424T150000
DTEND;TZID=Asia/Hong_Kong:20260424T160000
DTSTAMP:20260511T035338
CREATED:20260420T022232Z
LAST-MODIFIED:20260420T022232Z
UID:115713-1777042800-1777046400@ece.hku.hk
SUMMARY:RPG Seminar – A BO-based Method for Parameter Tuning in Voltage Controlled DERs to Improve Flexibility Area at TSO-DSO Interface
DESCRIPTION:Zoom Link:\nhttps://us05web.zoom.us/j/82211644170?pwd=MUs6qBHh0EZskKbZOsacWOHAGHK4rQ.1 \nAbstract\nThe rapid proliferation of aggregated flexible resources in active distribution systems (ADSs) calls for accurate estimation of the flexibility area (FA) at the transmission system operator–distribution system operator (TSO–DSO) interface to improve operational coordination. Meanwhile\, voltage control plays a critical role in maintaining both economic and secure grid operation. However\, the relationship between voltage control parameters and the FA metric is highly nonlinear and analytically intractable\, as inverter droop coefficients and other control parameters interact with network constraints and distributed energy resource (DER) operating conditions in a coupled manner. \nTo address this challenge\, this paper proposes a Bayesian optimization (BO)-based framework that systematically tunes voltage support parameters to maximize the FA potential. The main contributions are threefold: (1) a cross-layer optimization paradigm that links inverter-level droop control with systemlevel FA characteristics\, revealing how voltage control curves shape interface power flow dynamics; (2) a reformulated FA estimation process in which the Interval-Constrained Power Flow (ICPF) model\, embedded with droop-control operations\, is cast as a Bayesian black-box problem solved efficiently via Gaussian process surrogates with a tile-coding kernel; and (3) a composite performance index\, namely the Secure Area–Cost Flexibility (SeCoF)\, which jointly quantifies the trade-off between flexibility enhancement and operational cost. Case studies on modified IEEE 13-bus and IEEE 37-bus distribution systems demonstrate the effectiveness\, robustness\, and scalability of the proposed method in improving both technical flexibility and economic performance under realistic operational constraints. \nSpeaker\nMiss Zihui HONG\nDepartment of Electrical and Computer Engineering\nThe University of Hong Kong \nBiography of the Speaker\nZihui Hong received his BEng in Electrical and Electronic Engineering from Huazhong University of Science and Technology in 2024. She is currently pursuing an MPhil degree with Prof. Hou in the Department of Electrical and Computer Engineering\, the University of Hong Kong with a research focus on Bayesian Methods for Estimation and Optimization of Flexibility Region in Power Systems. \nOrganiser\nProf. Yunhe HOU \nDepartment of Electrical and Computer Engineering\, The University of Hong Kong \nAll are welcome.
URL:https://ece.hku.hk/events/20260424-3/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://ece.hku.hk/wp-content/uploads/2024/11/rpg-seminar.jpg
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