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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：ANALYSIS AND APPROXIMATION OF FLUIDS UNDER SINGULAR FORCING
奇异强迫体 分析 近似 牛顿流体
2023/5/5
Motivated by applications, like modeling of thin structures immersed in a fluid, we develop a well posedness theory for Newtonian and some non-Newtonian fluids under singular forcing in Lipschitz doma...
光电信息大讲堂第213期：低功耗高速通信电路与系统Low-Power and High-Speed Communications Circuits and Systems
物联网 无线电收发器 通信电路
2023/4/17
物联网的普遍应用依赖于以不断增长的速度高效地收集、交换和处理信息的能力。这对通信电路和系统的设计提出了巨大的挑战：在设备节点中，无线电通信需要同时实现低功耗、高性能和低成本；在核心数据网络（云）中，海量数据必须以超高吞吐量移动，要求信号链和时钟的高精度和保真度。为了应对这些挑战，本次报告讨论了用于物联网、医疗保健和生物医学应用的超低功率无线电收发器的几种创新架构和电路实现，以及高性能频率产生技术。...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：The spectral collocation method for the nonlocal problem with weak singularity
弱奇点 非局部问题 光谱搭配
2023/5/6
介绍求解一维弱奇异非局部扩散问题的谱配位法，建立了相应的Gauss-Jacobi 积分公式，并将其推广至高维非局部问题的谱配置点法，相关的理论与实验检验了算法的精度和渐进相容性。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Introduction to Peridynamics model and a POD-based fast algorithm for the nonlocal unsteady problems
近场动力学模型 POD 非局部 非定常问题 快速算法
2023/5/6
A brief introduction to Peridynamics model and a fast algorithm for the nonlocal unsteady problems is given in this talk. The POD algorithm can be employed in the numerical simulation of nonlocal diff...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：图像驱动的数控加工运动轨迹整体规划研究
图像驱动 数控加工 运动轨迹 整体规划
2023/5/6
运动轨迹规划是CAM的核心技术。随着航空航天关键零件的设计复杂程度、制造精度要求不断提升，高端数控装备的运动轨迹规划需综合考虑装备特性和零件设计所带来的工艺约束与几何约束，是一个多约束耦合的复杂优化问题。本报告将围绕这一问题，介绍团队前期提出的以图像为载体进行轨迹规划的新思路，探讨如何将多约束耦合的轨迹整体规划难题转化为数字图像处理操作进行求解。并针对蒙皮镜像铣、复合材料自动铺放等典型应用场景的轨...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：可压缩Navier-Stokes方程Riemann解的稳定性
可压缩 Navier-Stokes方程 Riemann解 稳定性
2023/5/6
可压缩Navier-Stokes方程描述可压缩粘性流体运动的力学规律，是流体力学中的基本方程。如果忽略粘性效应，可压缩Navier-Stokes方程即为无粘的可压缩Euler方程。可压缩Euler方程描述理想流体的运动，是典型的双曲守恒律方程组，其主要特点是：无论初值多么光滑和多么小，解都可能会爆破，形成间断（激波）。如果考虑可压缩Euler方程的Riemann问题，其解具有三种基本波：激波、稀疏...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Hidden structures behinds the compressible Navier-Stokes equations and its applications to the corresponding models
可压缩 纳维-斯托克斯方程 隐藏结构 相应模型应用
2023/5/6
In this talk, we will review the past developments on the solutions of the compressible Navier-Stokes equations and reveal the three hidden structures which linked the weak solution to the strong one....
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Existence of phase transition for percolation using the Gaussian Free Field
高斯自由 伯努利渗透 相变存在
2023/5/8
In this talk, we prove that Bernoulli percolation on graph undergoes a non-trivial phase transition if the graph has bounded degrees and random walk on the graph has a heat kernel with rapid decay. Th...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Dual Control for High Levels of Automation in Uncertain Environments
双重控制 不确定 环境 自动化
2023/5/8
For a system operating in an unknown or changing environment, it is desirable to design a control system to keep it always operating at its best possible performance (e. g. in terms of productivity or...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：From Marc Yor to Brownian loop-soups
马克约尔 布朗循环汤 loop-soups
2023/5/8
We will survey aspects of Brownian loop-soups, which provide a higher-dimensional incarnation of some ideas present Marc Yor's works.
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：An active contour model with local variance force term and its efficient minimization solver for multi-phase image
局部方差力项 活动轮廓模型 多相图像 最小化求解器
2023/5/8
In this work, we propose an active contour model with a local variance force (LVF) term that can be applied to multi-phase image segmentation problems. With the LVF, the proposed model is very effecti...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：The Application of Continuous Adjoint Method for Shape Optimization in Navier-Stokes Flow
连续伴随法 纳维-斯托克斯流 形状优化
2023/5/8
In this work, the shape optimization problem of a solid immersed in the incompressible fluid governed by Navier-Stokes equations is considered. Based on the continuous adjoint method, the shape gradie...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：The Use of Machine Learning in Treatment Effect Estimation
机器学习 治疗效果 估计
2023/5/8
We present recent developments in double machine learning (DML) approach. The DML approach is concerned primarily with selecting the relevant control variables and functional forms necessary for the c...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：A novel deep learning approach for tourism volume forecasting with tourist search data
游客搜索数据 旅游量预测 深度学习方法
2023/5/8
Tourism volume forecasting is the hot topic in tourism management, and deep learning techniques as the promising tool are becoming popular for capturing the characteristics of tourism volume data, whi...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：大型探测器的可靠性实践
大型探测器 可靠性实践 可靠性评估
2023/5/8
该报告将详细介绍大型探测器研制过程中的可靠性设计、可靠性试验、以及可靠性评估与验收等实践工作