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The effect of downstream resistance on flow diverter treatment of a cerebral aneurysm at a bifurcation: A joint computational-experimental study

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Journal of Hydrodynamics 2018年第5期30卷 803-814页

作者： ANDerson C.O.Tsang billy y.s.yiu Abraham y.s.Tang W.C.Chung Gilberto K.K.Leung AlexANDer K.K.Poon Alfred C.H.yu simon s.M.Lai K.W.Chow Department of surgery Li Ka Shing Faculty of Medicine University of Hong Kong Department of Electrical and Computer Engineering University of Waterloo Department of Mechanical Engineering University of Hong Kong Department of Electrical and Electronic Engineering University of Hong Kong

Intracranial aneurysm can lead to hemorrhagic stroke upon rupture. Deployment of flow diverters can restrict the blood flow into aneurysm and mitigate the rupture risk. Computational fluid dynamics（CFD） and ultrasonography with pulse-wave and color Doppler ultrasound measurements were employed jointly to investigate the complex flow pattern in cerebral aneurysms, both before and after the deployment of flow diverters. Patient-specific configurations of both bifurcation and side-wall aneurysms were selected. The effect of downstream flow resistance was investigated by adjusting the volume flow rate and pressure at the outlet vessels computationally and experimentally. Velocity profiles in the aneurysm measured from ultrasonography showed good agreement with those from computer simulations. The discrepancy in velocity between the computational and experimental sets of data is less than 10%. The downstream resistance can alter the volume flux into a bifurcation aneurysm with a flow diverter deployed by 236%, while the corresponding value of a side-wall aneurysm is negligible. The vorticity of the aneurysmal flow was reduced by more than 80% in both cases after stenting. This study demonstrated that careful investigation of downstream flow resistance of a bifurcation aneurysm is essential to provide an accurate assessment of the aneurysmal flow dynamics after flow diverter deployment.

关键词： Intracranial aneurysms computational fluid dynamics (CFD) doppler ultrasound

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sequence assembly using next generation sequencing data —challenges and solutions

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science China(Life sciences) 2014年第11期57卷 1140-1148页

作者： CHIN Francis y.L. LEUNG Henry C.M. yiu s.M. Department of Computer science The University of Hong Kong

sequence assembling is an important step for bioinformatics *** the help of next generation sequencing(NGs)technology,high throughput DNA fragment(reads)can be randomly sampled from DNA or RNA molecular ***,as the positions of reads being sampled are unknown,assembling process is required for combining overlapped reads to reconstruct the original DNA or RNA *** with traditional sanger sequencing methods,although the throughput of NGs reads increases,the read length is shorter and the error rate is *** introduces several problems in ***,paired-end reads instead of single-end reads can be sampled which contain more *** existing assemblers cannot fully utilize this information and fails to assemble longer *** this article,we will revisit the major problems of assembling NGs reads on genomic,transcriptomic,metagenomic and metatranscriptomic *** will also describe our IDBA package for solving these *** package has adopted several novel ideas in assembling,including using multiple k,local assembling and progressive depth *** with existence assemblers,IDBA has better performance on many simulated and real sequencing datasets.

关键词： genomic assembling de Bruijn graph paired-end reads next generation sequencing

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ENHANCED MECHANICAL PROPERTIEs OF POLyPROPyLENE/sILICA NANOCOMPOsITEs WITH sURFACE MODIFICATION OF NANO-sILICA VIA IN sITU COPOLyMERIZATION OF METHyL METHACRyLATE AND BUTyL ACRyLATE

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Chinese Journal of Polymer science 2009年第5期27卷 685-694页

作者： yiu-wing Mai Center for Advanced Materials Technology School of AerospaceMechanical and Mechatronic EngineeringJ07University of Sydney

Nano-sized silica particles were modified with methacryloxy-propyltrimethoxysilane(MPs) followed by in situ copolymerization of methyl methacrylate(MMA) and butyl acrylate(BA).These modified nanoparticles were compounded with polypropylene(PP) to prepare PP/silica *** grafted on nano-silica enhances the dispersion of the nanoparticles and interfacial adhesion,decreases the size of PP spherulites in nanocomposites and leads to increasing the young's modulus and toughness of PP/silica nanocomp...

关键词： Nano composites Interface Mechanical properties.

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Review of Feynman’s Path Integral in Quantum statistics:from the Molecular schrödinger Equation to Kleinert’s Variational Perturbation Theory

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Communications in Computational Physics 2014年第4期15卷 853-894页

作者： Kin-yiu Wong Department of Physics High Performance Cluster Computing CentreInstitute of Computational and Theoretical StudiesHong Kong Baptist University224 Waterloo RoadKowloon TongHong Kong Institute of Research and Continuing Education Hong Kong Baptist University(Shenzhen)

Feynman’s path integral reformulates the quantum schrödinger differential equation to be an integral *** has been being widely used to compute internuclear quantum-statistical effects on many-body molecular *** this Review,the molecular schrödinger equation will first be introduced,together with the BornOppenheimer approximation that decouples electronic and internuclear *** effective semiclassical potentials,e.g.,centroid potential,which are all formulated in terms of Feynman’s path integral,will be discussed and *** semiclassical potentials can be used to directly calculate the quantum canonical partition function without individual schrödinger’s energy *** a result,path integrations are conventionally performed with Monte Carlo and molecular dynamics sampling *** complement these techniques,we will examine how Kleinert’s variational perturbation(KP)theory can provide a complete theoretical foundation for developing non-sampling/non-stochastic methods to systematically calculate centroid *** enable the powerful KP theory to be practical for many-body molecular systems,we have proposed a new path-integral method:automated integrationfree path-integral(AIF-PI)*** to the integration-free and computationally inexpensive characteristics of our AIF-PI method,we have used it to perform ab initio path-integral calculations of kinetic isotope effects on proton-transfer and RNA-related phosphoryl-transfer chemical *** computational procedure of using our AIF-PI method,along with the features of our new centroid path-integral theory at the minimum of the absolute-zero energy(AMAZE),are also highlighted in this review.

关键词： Feynman’s path integral Kleinert’s variational perturbation theory schrödinger’s equation quantum statistics centroid potential energy quantum tunneling zero-point energy isotope effects

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A Harmony-Based Approach to student Diversity

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ECNU Review of Education 2024年第3期7卷 573-597页

作者： Lisa yiu stanford University

Purpose:Inspired by Kuan-Hsing Chen's“Asia as method,”this study investigates a multicultural approach to *** East Asia as the frame of reference,this study explores multicultur-alism in middle school classrooms in Chinese ***/Approach/Methods:semistructured interviews were conducted with principals,admin-istrators,and teachers at a middle school known for its diversity *** were coded based on the conceptual framework and emergent themes analyzed using ***:Findings elucidate the harmony-oriented multicultural approach adopted by administrators and teachers to empower the youth to embrace their ethnic *** approach was characterized by three Confucian-influenced features:whole-person develop-ment,strengthening of the collective school unit,and a school decision-making approach prioritizing“fairness.”OriginalityValue:This study investigates the multicultural responses of teachers and schools to student diversity through a nondeficit lens in East Asia,revealing the harmony-oriented prac-tices adopted in this *** addition to establishing a foundation for East Asian scholars to explore how teachers respond to student diversity in their respective contexts through an asset lens,the findings of this study advance our understanding of how to recognize differences and maintain social cohesion.

关键词： Asia as method harmony student diversity teacher practices

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Tailoring spontaneous infrared emission of HgTe quantum dots with laser-printed plasmonic arrays

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Light(science & Applications) 2020年第1期9卷 1870-1879页

作者： A.A.sergeev D.V.Pavlov A.A.Kuchmizhak M.V.Lapine W.K.yiu y.Dong N.Ke s.Juodkazis N.Zhao s.V.Kershaw A.L.Rogach Institute of Automation and Control Processes Far Eastern BranchRussian Academy of SciencesVladivostok 690041Russia Far Eastern Federal University Vladivostok 690090Russia University of Technology sydney NSW 2007 SydneyAustralia Department of Materials science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongKowloonHong Kong SARChina Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Material Science and ChemistryChina University of GeosciencesWuhan 430074China Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina swinburne University of Technology John St.HawthornVIC 3122Australia Melbourne Centre for Nanofabrication ANFF151 Wellington RoadClaytonVIC 3168Australia

Chemically synthesized near-infrared to mid-infrared(IR)colloidal quantum dots(QDs)offer a promising platform for the realization of devices including emitters,detectors,security,and sensor ***,at longer wavelengths,the quantum yield of such QDs decreases as the radiative emission rate drops following Fermi’s golden rule,while non-radiative recombination channels compete with light *** over the radiative and non-radiative channels of the IR-emitting QDs is crucially important to improve the performance of IR-range ***,we demonstrate strong enhancement of the spontaneous emission rate of near-to mid-IR HgTe QDs coupled to periodically arranged plasmonic nanoantennas,in the form of nanobumps,produced on the surface of glasssupported Au films via ablation-free direct femtosecond laser *** enhancement is achieved by simultaneous radiative coupling of the emission that spectrally matches the first-order lattice resonance of the arrays,as well as more efficient photoluminescence excitation provided by coupling of the pump radiation to the local surface plasmon resonances of the isolated ***,coupling of the HgTe QDs to the lattice plasmons reduces the influence of non-radiative decay losses mediated by the formation of polarons formed between QD surface-trapped carriers and the IR absorption bands of dodecanethiol used as a ligand on the QDs,allowing us to improve the shape of the emission spectrum through a reduction in the spectral dip related to this ligand *** the ease of the chemical synthesis and processing of the HgTe QDs combined with the scalability of the direct laser fabrication of nanoantennas with tailored plasmonic responses,our results provide an important step towards the design of IR-range devices for various applications.

关键词： quantum radiative coupling

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Privacy-preserving edge-assisted image retrieval and classification in IoT

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Frontiers of Computer science 2019年第5期13卷 1136-1147页

作者： Xuan LI Jin LI siuming yiu Chongzhi GAO Jinbo XIONG College of Mathematics and Informatics Fujian Normal University Fuzhou 350117 China Department of Computer science The University of Hong Kong Hong Kong 999077 China Fujian Provincial Key Laboratory of Network security and Cryptology Fuzhou 350117 China school of Computational science and Education software Guangzhou University Guangzhou 510006 China

Internet of Things (IoT) has drawn much attention in recent years. However, the image data captured by IoT terminal devices are closely related to users, personal information, which are sensitive and should be protected. Though traditional privacy-preserving outsourced computing solutions such as homomorphic cryptographic primitives can support privacy-preserving computing, they consume a significant amount of computation and storage resources. Thus, it becomes a heavy burden on IoT terminal devices with limited resources. In order to reduce the resource consumption of terminal device, we propose an edge-assisted privacy-preserving outsourced computing framework for image processing, including image retrieval and classification. The edge nodes cooperate with the terminal device to protect data and support privacy-preserving computing on the semitrusted cloud server. Under this framework, edge-assisted privacy-preserving image retrieval and classification schemes are proposed in this paper. The security analysis and performance evaluation show that the proposed schemes greatly reduce the computational, communication and storage burden of IoT terminal device while ensuring image data security.

关键词： Internet of Things outsourced computation privacy protection cryptographic primitive image processing

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Home range establishment and utilization by reintroduced lions(Panthera leo)in a small south African wildlife reserve

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Integrative Zoology 2017年第4期12卷 318-332页

作者： sze-Wing yiu Francesca PARRINI Leszek KARCZMARsKI Mark KEITH The swire Institute of Marine science School of Biological Sciencesthe University of Hong KongHong Kong SARChina Centre for African Ecology School of AnimalPlant and Environmental SciencesUniversity of the WitwatersrandJohannesburgSouth Africa Centre for Wildlife Management Department of Animal and Wildlife SciencesUniversity of PretoriaPretoriaSouth Africa

Understanding of animal spatial behavior is essential for informed management *** southern Africa,reintroduction of lions(Panthera leo)to small reserves(60 separate visits)around the largest dam and along rivers sugge... 详细信息

Understanding of animal spatial behavior is essential for informed management *** southern Africa,reintroduction of lions(Panthera leo)to small reserves(s increased since the early 2000s,however studies on their ranging behavior in these enclosed systems remain *** applied Time Local Convex Hull(T-LoCoH)methods to study the home range establishment and utilization of 11 lions reintroduced to Dinokeng Game Reserve,south Africa,during 2011 through *** established home ranges close to their release sites and during the following 3 years their home range sizes continued to increase,but in each individual case the size remained smaller than half of the reserve area(space use strategies differed between the core and the entire home range,with higher frequency of visits found in core *** high rates(>60 separate visits)around the largest dam and along rivers suggest the importance of water and its surrounding vegetation in the lions’space utilization *** home range size did not differ with season or sex of the individuals,whereas shifts in locations of home ranges revealed differences in the response of the 2 sexes to territorial conflicts and management *** study shows a dynamic home range utilization pattern and highlights the importance of both fine-scale space use patterns(frequency and duration of visits)and broadscale home range changes in understanding the ranging behavior of reintroduced animals.

关键词： carnivore movement space use T-LoCoH utilization distribution

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Video color conceptualization using optimization

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science China(Information sciences) 2014年第7期57卷 173-183页

作者： CAO XiaoChun ZHANG yuJie GUO XiaoJie CHEUNG yiu-Ming school of Computer science and Technology Tianjin University Department of Computer science Hong Kong Baptist UniversityHong Kong SARHong Kong 999077China

Color conceptualization aims to propagate"color concepts"from a library of natural color images to the input image by changing the main ***,the existing method may lead to spatial discontinuities in images because of the absence of a spatial consistency *** this paper,to solve this problem,we present a novel method to force neighboring pixels with similar intensities to have similar *** this constraint,the color conceptualization is formalized as an optimization problem with a quadratic cost ***,we further expand two-dimensional(still image)color conceptualization to three-dimensional(video),and use the information of neighboring pixels in both space and time to improve the consistency between neighboring *** performance of our proposed method is demonstrated for a variety of images and video sequences.

关键词： color conceptualization color discontinuity optimization color correspondence video sequence

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Visual inference of flow flux via free surface PDE model and image sequence assimilation

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IET Cyber-systems and Robotics 2019年第1期1卷 20-27页

作者： shan Guo Chao Xu Ka Fai Cedric yiu school of Mathematical sciences Zhejiang UniversityHangzhouPeople's Republic of China Department of Applied Mathematics Hong Kong Polytechnic UniversityHong KongPeople's Republic of China Institute of Cyber-systems and Control Zhejiang UniversityHangzhouPeople's Republic of China

The free-surface flows,such as flows in rivers,lakes,and tides,play an important role in hydraulic engineering and environmental ***,due to their complex and changeable characters,the precise evolution procedure is quite difficult to *** this study,the authors propose a novel framework to reconstruct the free-surface flow modelled by the shallow water equations by assimilating the images *** particular,the ensemble Kalman filter framework is employed to implement the assimilation *** efficiency of the proposed strategy has been verified through numerical simulations in which the accurate flow field in different situations could be obtained within limited assimilation steps.

关键词： process. flow steps

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