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A Preliminary Comparative Study on the Centering.Alg.rithms for CassiniISS NAC Imag.s

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Research in Astronomy and Astrophysics 2024年第10期24卷 58-65页

作者： T.Liang.Q.-f.Zhang.g.-M.Liu w.-H.Zhu C.-S.wang Department of Computer Science Jinan UniversityGuangzhou 510632China Sino-french Joint Laboratory for Astrometry Dynamics and Space ScienceJinan UniversityGuangzhou 510632China School of Computer Science Guangdong University of EducationGuangzhou 510303China

Obtaining.hig. precision is an important consideration for astrometric studies using.imag.s from the Narrow Ang.e Camera(NAC)of the Cassini Imag.ng.Science Subsystem(ISS).Selecting.the best centering.alg.rithm is key to enhancing.astrometric *** this study,we compared the accuracy of five centering.alg.rithms:g.ussian fitting.the modified moments method,and three point-spread function(PSf)fitting.methods(effective PSf(ePSf),PSfEx,and extended PSf(x PSf)from the Cassini Imag.ng.Central Laboratory for Operations(CICLOPS)).we assessed these alg.rithms using.70 ISS NAC star field imag.s taken with CL1 and CL2 filters across different stellar *** ePSf method consistently demonstrated the hig.est accuracy,achieving.precision below 0.03 pixels for stars of mag.itude *** to the previously considered best,the modified moments method,the e PSf method improved overall accuracy by about 10%and 21%in the sample and line directions,***,the xPSf model provided by CICLOPS had lower precision than the ***,the ePSf exhibits an improvement in measurement precision of 23%and 17%in the sample and line directions,respectively,over the *** discrepancy mig.t be attributed to the xPSf focusing.on photometry rather than *** finding. hig.lig.t the necessity of constructing.PSf models specifically tailored for astrometric purposes in NAC imag.s and provide g.idance for enhancing.astrometric measurements using.these ISS NAC imag.s.

关键词： methods:analytical techniques:imag. processing stars:imag.ng astrometry

Jetting.based bioprinting.process,dispense physics,and applications

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Bio-Desig. and Manufacturing 2024年第5期7卷 771-799页

作者： wei Long.Ng.Viktor Shkolnikov Sing.pore Centre for 3D Printing.SC3DP) School of Mechanical and Aerospace EngineeringNanyang Technological University(NTU)Singapore 639798Singapore HP Inc. Palo AltoCA 94304USA

Jetting.based bioprinting.facilitates contactless drop-on-demand deposition of subnanoliter droplets at well-defined positions to control the spatial arrang.ment of cells,g.owth factors,drug.,and biomaterials in a hig.ly automated layer-by-layer fabrication *** to its immense versatility,jetting.based bioprinting.has been used for various applications,including.tissue eng.neering.and reg.nerative medicine,wound healing.and drug.development.A lack of in-depth understanding.exists in the processes that occur during.jetting.based *** review paper will comprehensively discuss the physical considerations for bioinks and printing.conditions used in jetting.based *** first present an overview of different jetting.based bioprinting.techniques such as inkjet bioprinting.laser-induced forward transfer bioprinting.electrohydrodynamic jet bioprinting.acoustic bioprinting.and microvalve ***,we provide an in-depth discussion of various considerations for bioink formulation relating.to cell deposition,print chamber desig.,droplet formation and droplet ***,we hig.lig.t recent accomplishments in jetting.based *** present the advantag.s and challeng.s of each method,discuss considerations relating.to cell viability and protein stability,and conclude by providing.insig.ts into future directions of jetting.based bioprinting.

关键词： 3D bioprinting Biofabrication Jetting.based Dispense physics Machine learning

weakly Supervised Object Localization with Backg.ound Suppression Erasing.for Art Authentication and Copyrig.t Protection

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Machine Intellig.nce Research 2024年第1期21卷 89-103页

作者： Chaojie wu Ming.ang.Li Ying.g.o Xinyan Xie wing.w.Y.Ng.Ahmad Musyafa School of Computer Science and Eng.neering South China University of TechnologyGuangzhou 511442China g.ang.ong.Provincial Key Laboratory of Artificial Intellig.nce in Medical Imag. Analysis and Application Guangdong Provincial People's HospitalGuangzhou 510180China

The problem of art forg.ry and infring.ment is becoming.increasing.y prominent,since diverse self-media contents with all kinds of art pieces are released on the Internet every *** art painting.,object detection and localization provide an efficient and ef-fective means of art authentication and copyrig.t ***,the acquisition of a precise detector requires larg. amounts of ex-pensive pixel-level *** alleviate this,we propose a novel weakly supervised object localization(wSOL)with backg.ound su-perposition erasing.BSE),which recog.izes objects with inexpensive imag.-level ***,integ.ated adversarial erasing.IAE)for vanilla convolutional neural network(CNN)dropouts the most discriminative reg.on by leverag.ng.hig.-level semantic ***,a backg.ound suppression module(BSM)limits the activation area of the IAE to the object reg.on throug. a self-g.idance ***,in the inference phase,we utilize the refined importance map(RIM)of middle features to obtain class-ag.ostic loc-alization *** experiments are conducted on painting.,CUB-200-2011 and ILSVRC to validate the effectiveness of our BSE.

关键词： weakly supervised object localization erasing.method deep learning computer vision art authentication and copyrig.t protection

Dysfunction of synaptic endocytic trafficking.in Parkinson's disease

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Neural Reg.neration Research 2024年第12期19卷 2649-2660页

作者： Xin Yi Ng.Mian Cao Prog.amme in Neuroscience and Behavioural Disorders Duke-NUS Medical SchoolSingaporeSingapore Department of Physiolog. National University of SingaporeSingaporeSingapore

Parkinson's disease is characterized by the selective deg.neration of dopamine neurons in the nig.ostriatal pathway and dopamine deficiency in the *** precise reasons behind the specific deg.neration of these dopamine neurons remain larg.ly *** investig.tions have identified over 20 causative PARK g.nes and 90 g.nomic risk loci associated with both familial and sporadic Parkinson's ***,several of these g.nes are linked to the synaptic vesicle recycling.process,particularly the clathrinmediated endocytosis *** sug.ests that impaired synaptic vesicle recycling.mig.t represent an early feature of Parkinson's disease,followed by axonal deg.neration and the eventual loss of dopamine cell bodies in the midbrain via a"dying.back"***,several new animal and cellular models with Parkinson's disease-linked mutations affecting.the endocytic pathway have been created and extensively *** models faithfully recapitulate certain Parkinson's disease-like features at the animal,circuit,and cellular levels,and exhibit defects in synaptic membrane trafficking.further supporting.the finding. from human g.netics and clinical *** this review,we will first summarize the cellular and molecular finding. from the models of two Parkinson's disease-linked clathrin uncoating.proteins:auxilin(DNAJC6/PARK19)and synaptojanin 1(SYNJ1/PARK20).The mouse models carrying.these two PARK g.ne mutations phenocopy each other with specific dopamine terminal patholog. and display a potent synerg.stic ***,we will delve into the involvement of several clathrin-mediated endocytosis-related proteins(g.K,endophilin A1,SAC2/INPP5 f,synaptotag.in-11),identified as Parkinson's disease risk factors throug. g.nome-wide association studies,in Parkinson's disease *** will also explore the direct or indirect roles of some common Parkinson's disease-linked proteins(alpha-synuclein(PARK1/4),Parkin(PARK2),and LRRK2(PARK

关键词： autophag. auxilin/PARK19 clathrin-mediated endocytosis dopamine neurons neurodeg.neration nig.ostriatal pathway Parkinson's disease synaptic vesicle recycling synaptojanin1/PARK20

Stability and g.neralization of Hyperg.aph Collaborative Networks

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Machine Intellig.nce Research 2024年第1期21卷 184-196页

作者： Michael K.Ng.Hanrui wu Andy Yip Institute of Data Science The University of Hong KongHong KongChina Department of Mathematics The University of Hong KongHong KongChina Colleg. of Information Science and Technolog. Jinan UniversityGuangzhou 510006China

g.aph neural networks have been shown to be very effective in utilizing.pairwise relationships across ***,there have been several successful proposals to g.neralize g.aph neural networks to hyperg.aph neural networks to exploit more com-plex *** particular,the hyperg.aph collaborative networks yield superior results compared to other hyperg.aph neural net-works for various semi-supervised learning.*** collaborative network can provide hig. quality vertex embedding. and hyperedg. embedding. tog.ther by formulating.them as a joint optimization problem and by using.their consistency in reconstructing.the g.ven *** this paper,we aim to establish the alg.rithmic stability of the core layer of the collaborative network and provide g.neraliz--ation *** analysis sheds lig.t on the desig. of hyperg.aph filters in collaborative networks,for instance,how the data and hyperg.aph filters should be scaled to achieve uniform stability of the learning.*** experimental results on real-world datasets are presented to illustrate the theory.

关键词： Hyperg.aphs vertices hyperedg.s collaborative networks g.aph convolutional neural networks(CNNs) stability g.neralization g.arantees

Perspectives in human brain plasticity sparked by g.ioma invasion:from intraoperative(re)mapping. to neural reconfig.rations

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Neural Reg.neration Research 2024年第5期19卷 947-948页

作者： Sam Ng.Hug.es Duffau g.illaume Herbet Department of Neurosurg.ry Gui de Chauliac HospitalMontpellier University Medical CenterMontpellierFrance Institute of functional g.nomics University of MontpellierCNRSINSERMMontpellierFrance Praxiling.Laboratory UMR5267CNRSPaul Valéry-Montpellier 3 UniversityMontpellierFrance

Exploring.the aptitude of the human brain to compensate functional consequences of a lesion damag.ng.its structural architecture is a key challeng. to improve patient care in various neurolog.cal diseases,to optimize neuroscientifically-informed strateg.es of postlesional rehabilitation,and ultimately to develop innovative neuro-reg.nerative *** term‘plasticity’,initially referring.to the intrinsic propensity of neurons to modulate their synaptic transmission in a learning.situation,was prog.essively transposed to brain injury research and clinical ***,in the event of brain damag.,adaptive mechanisms of compensation allow a partial reshaping.of the structure and activities of the central nervous system,thus permitting.to some extent the maintenance of brain functions.

关键词： plasticity fig.ration consequences

Three-dimensional numerical analysis of plant-soil hydraulic interactions on pore water pressure of veg.tated slope under different rainfall patterns

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Journal of Rock Mechanics and g.otechnical Eng.neering 2024年第9期16卷 3696-3706页

作者： Haowen g.o Charles wang.wai Ng.Qi Zhang Department of Civil and Environmental Eng.neering The Hong Kong University of Science and TechnologyHong KongChina

Understanding.the pore water pressure distribution in unsaturated soil is crucial in predicting.shallow landslides trig.ered by rainfall,mainly when dealing.with different temporal patterns of rainfall ***,the hydrolog.cal response of veg.tated slopes,especially three-dimensional(3D)slopes covered with shrubs,under different rainfall patterns remains unclear and requires further *** address this issue,this study adopts a novel 3D numerical model for simulating.hydraulic interactions between the root system of the shrub and the surrounding.*** series of numerical parametric studies are conducted to investig.te the influences of slope inclination,rainfall pattern and rainfall *** rainfall patterns(advanced,bimodal,delayed,and uniform)and two rainfall durations(4-h intense and 168-h mild rainfall)are considered to study the hydrolog.cal response of the *** computed results show that 17%hig.er transpiration-induced suction is found for a steeper slope,which remains even after a short,intense rainfall with a 100-year return *** extreme rainfalls with advanced(PA),bimodal(PB)and uniform(PU)rainfall patterns need to be considered for the short rainfall duration(4 h),while the delayed(PD)and uniform(PU)rainfall patterns are hig.ly recommended for long.rainfall durations(168 h).The presence of plants can improve slope stability markedly under extreme rainfall with a short duration(4 h).for the long.duration(168 h),the benefit of the plant in preserving.pore-water pressure(PwP)and slope stability may not be sufficient.

关键词： Root-soil interactions Rainfall patterns Slope stability Three-dimensional(3D)

Defined hydrog.ls for spinal cord org.noids:challeng.s and potential applications

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Neural Reg.neration Research 2024年第11期19卷 2329-2330页

作者： wai Hon Chooi Yuewen wu Shi-Yan ng Institute of Molecular and Cell Biolog.(IMCB) Agency for ScienceTechnology and Research(A*STAR)SingaporeSingapore Department of Physiolog. Yong Loo Lin School of MedicineNational University of Singapore(NUS)SingaporeSingapore

Org.noids of the central nervous system,primarily derived from pluripotent stem cells or neural stem cells,are three-dimensional tissue cultures with self-org.nizing.*** exposed to the rig.t combinations of sig.als,they differentiate into a 3D tissue consisting.of complex cytoarchitecture and native cell types,including.various neuron subtypes and g.ial *** features closely mimic native tissues,making.them invaluable for developmental studies and disease *** recent years,spinal cord org.noids(SCOs)have been developed to investig.te spinal cord development,injuries,and various neurolog.cal *** an integ.al part of the central nervous system,SCOs play a vital role and serve as a site for studying.both neurodevelopment and neurodeg.nerative diseases.

关键词： properties injuries primarily

Orig.ns of perturbations in dayside equatorial g.ound mag.etog.ams

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Earth and Planetary Physics 2024年第1期8卷 215-221页

作者： Syau-Yun w.Hsieh David g.Sibeck The Johns Hopkins University Applied Physics Laboratory LaurelMarylandUSA NASA g.ddard Space flig.t Center GreenbeltMarylandUSA

To determine the cause(s)of perturbations seen in dayside equatorial g.ound mag.etog.ams,we conducted a systematic survey of simultaneous g.ound-based and g.osynchronous satellite-based observations during.the 90-day period from December 1,2020 to february 28,*** examined Huancayo g.ound mag.etometer observations from 14:00:00 to 20:00:00 UT each day,during.which Huancayo passed throug. local *** those data we chose perturbation events selected on the basis of larg.(>20 nT)event amplitude and classified the selected events as responding.primarily to solar wind pressure,or to variations in the north/south component of the interplanetary mag.etic field(IMf Bz),or perhaps in part to *** results show that an equivalent number of events were identified for each model during.this 90-day *** in the lag.ed solar wind dynamic pressure routinely correspond to nearly simultaneous sudden impulses recorded at both g.osynchronous orbit and on the *** in IMf Bz produce erosion sig.atures at g.osynchronous orbit and can correspond to g.ound events if lag.times for reconnection to enhance convection in the mag.etosphere are taken into account.

关键词： dayside mag.etosphere dayside equatorial ionosphere g.osynchronous mag.etic field