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Repeatable adaptive keypoint detection via self-supervised learning

Science China(Information Sciences) 2022年第11期65卷 123-147页

作者： Pei YAN Yihua TAN Yuan tai National Key Laboratory of Science & Technology on Multi-spectral Information Processing School of Artificial Intelligence and Automation Huazhong University of Science and Technology

Keypoint-based matching is a fundamental technology for different computer vision tasks, in which keypoint detection is a crucial step and directly affects the entire performance. Based on deep learning approaches, the learning-based keypoint detectors have been significantly developed. To further improve the accuracy of high-level matching tasks, the extracted keypoints should provide more accurate point-to-point correspondences and maintain a uniform spatial distribution. Based on this idea, a self-supervised learning method of keypoint detection named repeatable adaptive point is proposed. This method consists of a selfsupervised objective and an optimization algorithm. The objective maximizes the repeatability measure with the sparsity constraint of keypoints. This sparsity constraint is formulated by combining the non-maximum suppression operation and the penalty function of keypoint number, which generally makes keypoints have a uniform spatial distribution. A novel approximate alternate optimization algorithm is proposed to maximize the above objective, whose convergence is proved in theory. The proposed detector is “adaptive” because the combinations of it and some existing descriptors can adapt to high-level matching tasks with a fast convergence speed. Specifically, the combinations of it and SuperPoint/HardNet descriptors achieve stateof-the-art accuracy on three high-level tasks based on image matching, namely homography estimation,camera pose estimation, and three-dimensional reconstruction. Furthermore, the proposed method converges faster on new scenes compared with the state-of-the-art method that jointly optimizes the detector and the descriptor.

关键词： keypoint detection convolutional neural network image matching self-supervised learning repeatable

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SYNTHESIS AND CHARACTERIZATION OF A SOLUBLE LADDERLIKE POLYSILSESQUIOXANE CONtaiNING REACTIVE ESTER GROUPS

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Chinese Journal of Polymer Science 2001年第2期19卷 209-216页

作者：张榕本 tai-shung Chung PCLCC Center for Molecular Science Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China An abbreviation for Polymer Chemistry LaboratoryChinese Academy of Sciences and China Petro-Chemical Corporation Institute of Materials Research and Engineering National University of Singapore Singapore 119260

A novel soluble ladderlike polysilsesquioxane containing reactive ester groups (Ester-T) was synthesized for the first time by stepwise coupling polymerization including preammonolysis, controlled hydrolysis and polycondensation. The monomer, 3-trichlorosilylpropoxy 4-acetoxybenzoate (M), was synthesized by hydrosilylation of allyloxy 4-acetoxybenzoate with trichlorosilane in the presence of dicyclopentadienylplatinum (II) chloride (Cp2PtCl2) catalyst. Combination of FTIR, H-1-NMR, C-13-NMR, Si-29-NMR, XRD, DSC, TGA and VPO methods was used to demonstrate that the polymer obtained has an ordered ladderlike structure. The synthesized Ester-T may have promising applications as a precursor of advanced functional polymers.

关键词： ladderlike polysilsesquioxane stepwise coupling polymerization hydrosilylation characterization

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Combined Effect of Fluoride and Arsenate on Gene Expression of Osteoclast Differentiation Factor and Osteoprotegerin

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Biomedical and Environmental Sciences 2006年第5期19卷 375-379页

作者： LIN JIA tai-YIJIN Department of Toxicology School of Public Health Fudan University Shanghai 200032 China

Objective To study the combined effect of fluoride and arsenate on the expression of SD rat osteoblastic osteoclast differentiation factor （ODF） mRNA and osteoprotegerin （OPG） mRNA. Methods Osteoblasts were obtained by enzymatic isolation from newborn SD rats. A factorial experiment was performed. Osteoblasts were exposed to NaF （0.5 mmolF/L, 4 molF/L） and Na3AsH2 （12.5 μmolAs/L and 200 μmolAs/L） separately or F plus As and cultured for 48 h. The gene expression of osteoblastic ODF and OPG was observed by RT-PCR. Results The expression ofODF mRNA increased in F0.5, F4 groups compared with control group and two groups of ***200, F,As200 compared with As200 group, and decreased significantly in groups of F4As12.5, F0.5As200, and F4As200. The expression of OPG rnRNA decreased in groups of F4, As200, F4As12.5, F0.5As200, and F4As200. Conclusion The joint effect of fluoride and arsenate on the gene expression of ODF is antagonistic, while the combined effect on the gene expression of OPG is synergistic. F4, F4As12.5, and F0.5As200 promote bone resorption of rat osteoclasts, whereas F0.5As12.5 inhibits osteolytic effect of rat osteoclasts.

关键词： Fluoride Arsenate ODF OPG Combined effect

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Effect of strain-gradients of surface micro-beams on frequency-shift of a quartz crystal resonator under thickness-shear vibrations

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Acta Mechanica Sinica 2015年第5期31卷 647-652页

作者： Ling-Cheng Kong Yuan-tai Hu Department of Mechanics Huazhong University of Science and Technology

With introduction of the first-order strain-gradient of surface micro-beams into the energy density function,we developed a two-dimensional dynamic model for a compound quartz crystal resonator（QCR） system,consisting of a QCR and surface micro-beam *** frequency shift that was induced by micro-beams with consideration of strain-gradients is discussed in detail and some useful results are obtained,which have important significance in resonator design and applications.

关键词： Micro-beams Strain-gradient Quartz crystal resonator Frequency shift

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Electron microscopic visualization of asymmetric precursor translocation intermediates:SecA functions as a dimer

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Science China(Life Sciences) 2010年第9期53卷 1049-1056页

作者： tai Phang C Department of Biology Georgia State University

SecA,the ATPase of Sec translocase,mediates the post-translational translocation of preprotein through the protein-conduct-ing channel SecYEG in the bacterial inner *** we report the structures of Escherichia coli Sec intermediates during preprotein translocation as visualized by electron microscopy to probe the oligomeric states of SecA during this *** found that the translocase holoenzyme is symmetrically assembled by SecA and SecYEG on proteoliposomes,whereas the translocation intermediate 31 (I31) becomes asymmetric because of the presence of ***,SecA is a dimer in these two translocation *** work also shows surface topological changes in the components of translocation intermediates by immunogold *** channel entry for preprotein translocation was found at the center of the I31 *** results indicate that the presence of preprotein introduces asymmetry into translocation intermediates,while SecA remains dimeric during the translocation process.

关键词： SecA SecYEG electron microscopy single particle analysis

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The role of genetic factors in HBV-related HCC:perspectives from local genetic backgrounds and clinical epidemiology

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Hepatoma Research 2020年第11期6卷 1-12页

作者： Dar-In tai Jennifer tai Liver Research Center Chang Gung Memorial HospitalLinkou Medical CenterTaoyuan 33305Taiwan Department of Internal Medicine Chang Gung Memorial HospitalLinkou Medical CenterTaoyuan 33305Taiwan

Familial clustering of hepatitis B surface antigen carriers(HBsAg)and hepatocellular carcinoma(HCC)has led to the evaluation of the role of genetics in hepatitis B-related *** reports indicate that the HLA-DP and-DQ loci are associated with persistent hepatitis B virus(HBV)***,for hepatocarcinogenesis,existing studies have low power and conflicting *** single nucleotide polymorphism(SNP)data was collected from the 1000 Genomes Project and correlated with local epidemiological *** Asia has a higher prevalence of HBsAg than Northeastern Asia;this was used in the evaluation of persistent HBV *** higher incidence of HCC in West Africa compared with East Africa was used in the evaluation of *** allele frequencies for SNPs were significantly different between East Asians and ***,SNPs that have been identified in persistent HBV infections in East Asia may not be completely applicable in *** in NTCP,CTF19,and the HLA-DQ and-DP loci showed North-to-South allele frequency changes in East *** findings confirm the role of genetics in persistent HBV *** of the SNPs in the HLA loci show a trend of West-to-East allele frequency changes in Africa,indicating they may participate in *** the non-HLA related SNPs,rs2596542 in MICA shows a strong trend of allele frequency changes and is correlated with HCC incidence in *** in KIF1,IL-1A,and STAT4 also show,albeit with low statistical power,allele frequency trends compatible with HCC *** together,there are strong correlations between background genetics in HLA-DP and-DQ loci with persistent HBV infection and *** correlations were weak-positive in non-HLA loci.

关键词： Genetic polymorphism genome-wide associated studies hepatitis B virus hepatocellular carcinoma

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ON GREEN'S FUNCTION FOR HYPERBOLIC-PARABOLIC SYSTEMS

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Acta Mathematica Scientia 2009年第6期29卷 1556-1572页

作者： tai-Ping Liu Yanni Zeng Department of Mathematics Stanford University Stanford CA 94305 USA Department of Mathematics University of Alabama at Birmingham Birmingham AL 35294 USA

We study the Green＇s function for a general hyperbolic-parabolic system, including the Navier-Stokes equations for compressible fluids and the equations for magnetohydrodynamics. More generally, we consider general systems under the basic Kawashima- Shizuta type of conditions. The first result is to make precise the secondary waves with subscale structure, revealing the nature of coupling of waves pertaining to different characteristic families. The second result is on the continuous differentiability of the Green＇s function with respect to a small parameter when the coefficients of the system are smooth functions of that parameter. The results significantly improve previous results obtained by the authors.

关键词： Green's functions hyperbolic-parabolic systems conservation laws Navier-Stokes equations for compressible fluids

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Uzawa Iteration Method for Stokes Type Variational Inequality of the Second Kind

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Acta Mathematicae Applicatae Sinica 2011年第2期27卷 303-316页

作者： Yuan Li Kai-tai Li College of Mathematics and Information Science Wenzhou University Wenzhou 325035 China College of Science Xi'an Jiaotong University Xi'an 710049 China

In this paper, the Uzawa iteration algorithm is applied to the Stokes problem with nonlinear slip boundary conditions whose variational formulation is the variational inequality of the second kind. Firstly, the multiplier in a convex set is introduced such that the variational inequality is equivalent to the variational identity. Moreover, the solution of the variational identity satisfies the saddle-point problem of the Lagrangian functional ζ. Subsequently, the Uzawa algorithm is proposed to solve the solution of the saddle-point problem. We show the convergence of the algorithm and obtain the convergence rate. Finally, we give the numerical results to verify the feasibility of the Uzawa algorithm.

关键词： Stokes problem nonlinear slip boundary variational inequality Uzawa iteration algorithm

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Plasma-based X-ray laser speckle and its application on ferroelectric material

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Nuclear Science and Techniques 2005年第4期16卷 193-200页

作者： tai Ren-Zhong NAMIKAWA Kazumichi Shanghai Institute of Applied Physics the Chinese Academy of Sicenees Shanghai 201800 China Department of Physics Tokyo Gakugei University. 4-1-1 Nukui-Kita Machi Koganei-Shi Tokyo 184-8501 Japan

A new type of soft X-ray source, i.e. a plasma-based X-ray laser, is found to be promising to conduct transient measurement. By means of picosecond X-ray laser speckles, the dynamic microscopic polarization clusters within cubic (paraelectric) BaTiO3 was directly observed and characterized in a microscopic scale for the first time. This opens a way to study this type of clusters, which usually manifest large external-field response for ferroelectric materials.

关键词： X射线激光铁电物质 BaTiO3

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Electrically stimulated cell migration and its contribution to wound healing

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Burns & Trauma 2018年第3期6卷 183-189页

作者： Guangping tai Michael tai Min Zhao Centre of Advanced Biofabrication Department of Bioengineering and Environmental SciencesHefei UniversityHefei CityChina St Catherine’s College Medical Sciences DivisionUniversity of OxfordOxford OX1 3UJUK Departments of Dermatology and Ophthalmology School of MedicineUniversity of CaliforniaDavisCA 95817USA

Naturally occurring electric fields are known to be morphogenetic cues and associated with growth and healing throughout mammalian and amphibian animals and the plant kingdom. Electricity in animals was discovered in the eighteenth century. Electric fields activate multiple cellular signaling pathways such as PI3K/PTEN, the membrane channel of KCNJ15/Kir4.2 and intracellular polyamines. These pathways are involved in the sensing of physiological electric fields, directional cell migration (galvanotaxis, also known as electrotaxis), and possibly other cellular responses. Importantly, electric fields provide a dominant and over-riding signal that directs cell migration. Electrical stimulation could be a promising therapeutic method in promoting wound healing and activating regeneration of chronic and non-healing wounds. This review provides an update of the physiological role of electric fields, its cellular and molecular mechanisms, its potential therapeutic value, and questions that still await answers.

关键词： Wound healing Ion transport Endogenous electric fields Electrical stimulation Cell migration Clinical trials

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