检索结果-内蒙古大学图书馆

LMS-Net: A learned Mumford-Shah network for binary few-shot medical image segmentation

Medical Image Analysis 2025年 105卷

作者： Shengdong Zhang Fan Jia Xiang Li Hao Zhang Jun Shi Liyan Ma Shihui Ying Department of Mathematics School of Science Shanghai University Shanghai 200444 China Department of Mathematics and Scientific Computing and Imaging (SCI) Institute University of Utah Salt Lake City 84102 UT USA School of Computer Science and Technology East China Normal University Shanghai 200444 China School of Communication and Information Engineering Shanghai University Shanghai 200444 China School of Computer Engineering and Science Shanghai University Shanghai 200444 China School of Mechatronic Engineering and Automation Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai University Shanghai 200444 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai 200072 China School of Mechanics and Engineering Science Shanghai University Shanghai 200072 China

Few-shot semantic segmentation (FSS) methods have shown great promise in handling data-scarce scenarios, particularly in medical image segmentation tasks. However, most existing FSS architectures lack sufficient interpretability and fail to fully incorporate the underlying physical structures of semantic regions. To address these issues, in this paper, we propose a novel deep unfolding network, called the Learned Mumford-Shah Network (LMS-Net), for the FSS task. Specifically, motivated by the effectiveness of pixel-to-prototype comparison in prototypical FSS methods and the capability of deep priors to model complex spatial structures, we leverage our learned Mumford-Shah model (LMS model) as a mathematical foundation to integrate these insights into a unified framework. By reformulating the LMS model into prototype update and mask update tasks, we propose an alternating optimization algorithm to solve it efficiently. Further, the iterative steps of this algorithm are unfolded into corresponding network modules, resulting in LMS-Net with clear interpretability. Comprehensive experiments on three publicly available medical segmentation datasets verify the effectiveness of our method, demonstrating superior accuracy and robustness in handling complex structures and adapting to challenging segmentation scenarios. These results highlight the potential of LMS-Net to advance FSS in medical imaging applications. Our code will be available at: https://***/SDZhang01/LMSNet .

关键词： Deep denoising prior Deep unfolding network Few-shot semantic segmentation Mumford-Shah model

来源：评论

学校读者我要写书评

暂无评论

Long-range propagation of magnon polaritons in a canted antiferromagnet

引用

Physical Review Applied 2025年第6期23卷 L061002-L061002页

作者： Hanchen Wang Jinlong Wang Kanglin Yu Lutong Sheng Yongjian Zhou Rundong Yuan Chensong Hua Weichao Yu Junfeng Hu Jilei Chen Cheng Song Jean-Philippe Ansermet Mehrdad Elyasi Gerrit E.W. Bauer Haiming Yu Fert Beijing Institute MIIT Key Laboratory of Spintronics School of Integrated Circuit Science and Engineering Beihang University Beijing 100191 China International Quantum Academy Shenzhen 518048 China Department of Materials ETH Zurich Zurich 8093 Switzerland Key Laboratory of Advanced Materials (MOE) School of Materials Science and Engineering Tsinghua University Beijing 100084 China Cavendish Laboratory Department of Physics University of Cambridge Cambridge CB3 0HE United Kingdom Institute for Nanoelectronic Devices and Quantum Computing State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Zhangjiang Fudan International Innovation Center Fudan University Shanghai 201210 China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Institute of Physics École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland WPI Advanced Institute for Materials Research Tohoku University Sendai 980-8577 Japan Kavli Institute for Theoretical Sciences University of the Chinese Academy of Sciences Beijing 100190 China Institute for Materials Research Tohoku University Sendai 980-8577 Japan

We report strong coupling between magnons and cavity photons in a single-crystalline slab of α-Fe2O3 (hematite) with canted antiferromagnetic order at room temperature. The hybridized magnon polaritons propagate over many millimeters due to their high group velocities, as experimentally characterized using time-of-flight spectroscopy. The conventional dipolar and spin-orbit-interaction-induced chirality can explain an observed nonreciprocity. Our findings highlight the potential of antiferromagnetic magnon polaritons for on-chip spin-based information technologies.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Boosting Electrocatalytic Carbon Dioxide Reduction via Self-Relaxation of Asymmetric Coordination in Fe-Based Single Atom Catalyst

引用

Angewandte Chemie 2023年第6期136卷

作者： Zhaoyong Jin Dongxu Jiao Yilong Dong Lin Liu Jinchang Fan Ming Gong Xingcheng Ma Ying Wang Wei Zhang Prof. Lei Zhang Prof. Dr. Zhi Gen Yu Prof. Dr. Damien Voiry Weitao Zheng Prof. Dr. Xiaoqiang Cui School of Materials Science and Engineering Key Laboratory of Automobile Materials of MOE Electron Microscopy Center Jilin University 130012 Changchun China College of Chemistry Jilin University 130012 Changchun China Institute of High Performance Computing (IHPC) Agency for Science Technology and Research (A*STAR) 1 Fusionopolis Way #16-16 Connexis 138632 Singapore Singapore Institut Européen des Membranes IEM UMR 5635 Université Montpellier ENSCM CNRS 34000 Montpellier France

Addressing the limitations arising from the consistent catalytic behavior observed for various intermediates during the electrochemical carbon dioxide reduction reaction (CO 2 RR) poses a significant challenge in the optimization of catalytic activity. In this study, we aimed to address this challenge by constructing an asymmetric coordination Fe single atom catalyst (SCA) with a dynamically evolved structure. Our catalyst, consisting of a Fe atom coordinated with one S atom and three N atoms (Fe−S 1 N 3 ), exhibited exceptional selectivity (CO Faradaic efficiency of 99.02 %) and demonstrated a high intrinsic activity (TOF of 7804.34 h −1 ), and remarkable stability. Using operando XAFS spectra and Density Functional Theory (DFT) calculations, we elucidated the self-relaxation of geometric distortion and dynamic evolution of bond lengths within the catalyst. These structure changes enabled independent regulation of the *COOH and *CO intermediate adsorption energies, effectively breaking the linear scale relationship and enhancing the intrinsic activity of CO 2 RR. This study provides valuable insights into the dynamic evolution of SACs and paves the way for targeted catalyst designs aimed to disrupt the linear scaling relationships.

关键词： Asymmetric Coordination CO2 Reduction Reaction Dynamic Evolution Self-Relaxation Single Atom Catalysts

来源：评论

学校读者我要写书评

暂无评论

The effect of numerical noises on statistics of a chaotic dynamical system 8

The effect of numerical noises on statistics of a chaotic dy...

引用

2018 8th International Conference on Applied Physics and Mathematics, ICAPM 2018

作者： Li, Xiaoming Li, Xiaochen Liao, Shijun School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai200240 China School of Civil Engineering and Transportation South China University of Technology Guangzhou510641 China MoE Key Laboratory in Scientific and Engineering Computing Shanghai200240 China

It is well known that chaotic dynamical systems have the sensitive dependence on initial conditions (SDIC). Unfortunately, numerical noises (such as truncation error and round-off error) always exist in practice. Thus, due to the SDIC, long-term accurate prediction of chaotic dynamical systems is practically impossible. In this paper, using the so-called "clean numerical simulation" (CNS) whose numerical noises might be much smaller even than micro-level physical uncertainty and thus are negligible, we gain accurate prediction of a chaotic dynamical system in a long enough interval of time. Then, based on these reliable simulations, the influence of numerical noises on statistic computations is investigated. It is found that the influence of numerical noises is negligible when statistic results are time-independent. Unfortunately, when the statistics of a chaotic dynamical system are time-dependent, numerical noises have a great influence even on statistic computations. © Published under licence by IOP Publishing Ltd.

关键词： Statistics

来源：评论

学校读者我要写书评

暂无评论

Two-Photon Clusteroluminescence Enabled by Through-Space Conjugation for In Vivo Bioimaging

引用

Angewandte Chemie 2024年第1期137卷

作者： Dr. Jianyu Zhang Dr. Hanchen Shen Zuping Xiong Lidong Du Moxin Li Dr. Xinwen Ou Xinyan Zhu Dr. Jacky W. Y. Lam Prof. Tzu-Ming Liu Dr. Changhuo Xu Prof. Haoke Zhang Prof. Ben Zhong Tang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 3100587 China Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong 999077 China Present address: Stratingh Institute for Chemistry University of Groningen Groningen 9747 AG The Netherlands Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 311215 China Centre of Healthcare Materials Shaoxing Institute Zhejiang University Shaoxing 312000 China MOE Frontiers Science Center for Precision Oncology Faculty of Health Sciences University of Macau Macao 999078 China School of Science and Engineering Shenzhen Institute of Aggregate Science and Technology The Chinese University of Hong Kong Shenzhen Guangdong 518172 China

Clusteroluminescence (CL) materials without largely conjugated structures have gained significant attention due to their unique photophysical properties and potential in bioimaging. However, low luminescence efficiency and short emission wavelength limit their development. This work designs three luminogens with CL properties (CLgens) by introducing n -electron-involved through-space conjugation (TSC) into diarylmethane. Apart from single-photon excited long-wavelength (686 nm) and high-efficiency (29 %) CL, two-photon clusteroluminescence (TPCL) is successfully achieved in such small luminogens with only two isolated heteroatomic units. TSC stabilized in the aggregate state has been proven to realize efficient spatial electron delocalization similar to conventionally conjugated compounds. Encouraged by the excellent TPCL properties, two-photon imaging of blood vessels in vivo and biocompatibility verification utilizing CLgens are also achieved. This work illustrates the essential role of TSC in promoting nonlinear optical properties of CLgens and may facilitate further design and development of the next generation of bioprobes with excellent biocompatibility.

关键词： clusteroluminescence through-space conjugation nonlinear photophysics two-photon fluorescence bioimaging

来源：评论

学校读者我要写书评

暂无评论

Numerical methods for stochastic Volterra integral equations with weakly singular kernels

arXiv

引用

arXiv 2020年

作者： Li, Min Huang, Chengming Hu, Yaozhong School of Mathematics and Statistics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Engineering Modelling and Scientific Computing Huazhong University of Science and Technology Wuhan430074 China Department of Mathematical and Statistical Sciences University of Alberta EdmontonT6G 2G1 Canada

In this paper, we first establish the existence, uniqueness and Hölder continuity of the solution to stochastic Volterra integral equations with weakly singular kernels. Then, we propose a θ-Euler-Maruyama scheme and a Milstein scheme to solve the equations numerically and we obtain the strong rates of convergence for both schemes in Lp norm for any p ≥ 1. For the θ-Euler-Maruyama scheme the rate is min{1 − α, 12 − β} and for the Milstein scheme the rate is min{1 − α, 1 − 2β} when α, 12, where (0 12 ). These results on the rates of convergence are significantly different from that of the similar schemes for the stochastic Volterra integral equations with regular kernels. The difficulty to obtain our results is the lack of Itô formula for the equations. To get around of this difficulty we use instead the Taylor formula and then carry a sophisticated analysis on the equation the solution satisfies. Copyright © 2020, The Authors. All rights reserved.

关键词： Integral equations

来源：评论

学校读者我要写书评

暂无评论

Periodic satellite orbits of the Broucke-Hadjidemetriou-Hénon family of three-body system with unequal masses

Research Square

引用

Research Square 2020年

作者： Li, Xiaoming Liao, Shijun Department of Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology CambridgeMA02139 United States MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China School of Physics and Astronomy Shanghai Jiaotong University Shanghai200240 China Center of Advanced Computing School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai200240 China

Triple systems are common and key objects in astronomy. The three-body problem has received much more attention in recent years1–3. All observed periodic triple stars systems4–6 belong to the Broucke-Hadjidemetriou-Hénon’s (BHH) family7–9. The BHH orbits are a family of periodic orbits of the three-body system with the simplest topological free group word10 a, while Janković and Dmitrašinović 1 gained 58 equal-mass BHH satellite orbits which have free group words ak (k > 1), where k is the topological exponent. However, the BHH satellite orbits with equal mass is lack of realistic meaning because they do not exist in practice. Here we present 419743 new BHH orbits and 179253 new BHH satellites (k > 1) for three-body system with unequal mass. Especially, 48761 among the 179253 new BHH satellites are stable and have unequal masses. It suggests that these 48761 stable BHH satellites could be found by the observation. Besides, for the three-body system with equal mass at a fixed energy, it was demonstrated that the relationship between the angular momentum (L) and topological scaled period (T/k) of the BHH satellites is the same as that of the BHH orbits1. However, we found that this does not hold for the three-body system with unequal mass. Our findings have broad impact for the astrophysical scenario: they could inspire the theoretical and observational study of the triple system, the formation of triple stars11, the gravitational waves pattern12 and the gravitational waves observation13 of the triple system. © 2020, CC BY.

关键词： Satellites

来源：评论

学校读者我要写书评

暂无评论

Satellites of the Broucke-Hadjidemetriou-Hénon family of periodic unequal-mass three-body orbits

arXiv

引用

arXiv 2020年

作者： Li, Xiaoming Liao, Shijun MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China Department of Earth Atmospheric and Planetary Sciences Massachusetts Institute of Technology CambridgeMA02139 United States School of Physics and Astronomy Shanghai Jiaotong University Shanghai200240 China Center of Advanced Computing School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai200240 China

The Broucke-Hadjidemetriou-Hénon’s (BHH) orbits are a family of periodic orbits of the three-body system with the simplest topological free group word a, while the BHH satellites have free group words ak (k > 1), where k is the topological exponent. Janković and Dmitrašinović [Phy. Rev. Lett. 116, 064301 (2016)] reported 57 new BHH satellites with equal mass and found that at a fixed energy the relationship between the angular momentum (L) and the topologically rescaled period (T/k) is the same for both of the BHH orbits (k = 1) and the BHH satellites (k > 1). In this letter, we report 419,743 new BHH orbits (k = 1) and 179,253 new BHH satellites (k > 1) of the three-body system with unequal mass, which have never been reported, to the best of our knowledge. Among these newly-found 598,996 BBH orbits and satellites, about 33.5% (i.e., 200,686) are linearly stable and thus many among them might be observed in practice. Besides, we discover that, for the three-body system with unequal mass at a fixed energy, relationship between the angular momentum (L) and topologically rescaled period (T/k) of the BHH satellites (k > 1) is different from that of the BHH orbits (k = 1). Copyright © 2020, The Authors. All rights reserved.

关键词： Satellites

来源：评论

学校读者我要写书评

暂无评论

Mixed bounce-back boundary scheme of the general propagation lattice Boltzmann method for advection-diffusion equations

引用

Physical Review E 2019年第6期99卷 063316-063316页

作者： Xiuya Guo Zhenhua Chai Shengyong Pang Yong Zhao Baochang Shi School of Mathematics and Statistics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan 430074 China

In this work, a mixed bounce-back boundary scheme of general propagation lattice Boltzmann (GPLB) model is proposed for isotropic advection-diffusion equations (ADEs) with Robin boundary condition, and a detailed asymptotic analysis is also conducted to show that the present boundary scheme for the straight walls has a second-order accuracy in space. In addition, several numerical examples, including the Helmholtz equation in a square domain, the diffusion equation with sinusoidal concentration gradient, one-dimensional transient ADE with Robin boundary and an ADE with a source term, are also considered. The results indicate that the numerical solutions agree well with the analytical ones, and the convergence rate is close to 2.0. Furthermore, through adjusting the two parameters in the GPLB model properly, the present boundary scheme can be more accurate than some existing lattice Boltzmann boundary schemes.

关键词： Lattice-Boltzmann methods

来源：评论

学校读者我要写书评

暂无评论

Stochastic Trust-Region Methods with Trust-Region Radius Depending on Probabilistic Models

arXiv

引用

arXiv 2019年

作者： Wang, Xiaoyu Yuan, Ya-Xiang Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Zhong Guan Cun Donglu 55 Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Scientific/Engineering Computing Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China

We present a stochastic trust-region model-based framework in which its radius is related to the probabilistic models. Especially, we propose a specific algorithm, termed STRME, in which the trust-region radius depends linearly on the latest model gradient. The complexity of STRME method in non-convex, convex and strongly convex settings has all been analyzed, which matches the existing algorithms based on probabilistic properties. In addition, several numerical experiments are carried out to reveal the benefits of the proposed methods compared to the existing stochastic trust-region methods and other relevant stochastic gradient *** Codes 65K05, 65K10, 90C60 Copyright © 2019, The Authors. All rights reserved.

关键词： Gradient methods

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：