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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Twisted generalized Reed-Solomon codes with twists
扭曲 广义 里德-所罗门代码 RS编码
2023/4/25
Twisted generalized Reed-Solomon (TGRS) codes get much attention recently. In this talk, we focus on a class of TGRS codes with general ?? twists. Conditions to be MDS or self-dual are discussed.
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：CAD/CAE一体化的研究与体会
CAD/CAE一体化 三维重建 计算机图形学
2023/4/26
对物体的高效高精度三维重建是计算机图形学、三维视觉等领域的核心研究问题。CAD／CAE一体化CAD/CAE一体化是困扰工业界数十年的历史性难题，也是当前工业界提高设计能力的最主要手段之一。一般来说，CAD/CAE一体化旨在形成设计仿真闭环，加速产品设计效率，提升产品质量。然而，由于CAD、CAE过程在工业设计流程中不同的工业目的，CAD、CAE模型采用不同的模型表示，包含不同的设计或仿真语义信息，...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Implicit biases of optimization algorithms for neural networks and their effects on generalization
神经网络 优化算法 隐式偏差 泛化的影响
2023/4/26
Modern neural networks are usually over-parameterized—the number of parameters exceeds the number of training data. In this case the loss functions tend to have many (or even infinite) global minima, ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Geometry and recovery of spectral-sparse signals
频谱稀疏信号 几何 恢复
2023/4/26
Spectral-sparse signals are those sparse in the Fourier domain and are very common in wireless communications, radar, sonar, medical imaging and other applications. Their recovery from noisy, limited ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Fast and accurate solvers for the three dimensional elastic scattering problems
三维弹性 散射 求解器 弹性波
2023/4/26
The scattering problems for elastic waves have recently received ever increasing attentions in both the engineering and mathematical communities for their important applications in geophysics and seis...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：太阳爆发抵近探测计划简介
太阳爆发 抵近探测 深空探测
2023/4/26
本报告旨在介绍一项具有重大科学意义和应用价值的深空探测任务的构想。该任务将对驱动恒星大尺度爆发过程的中心结构（即磁重联电流片）进行抵近（原位）探测，主要目的是详细研究发生在离地球最近的恒星—太阳上的大尺度磁重联过程的精细物理特征，揭示太阳系中最为剧烈的能量释放过程(即太阳爆发或太阳风暴)的奥秘。该任务的科学目标—磁重联过程是发生在宇宙磁化等离子体中的能量转换和释放的核心过程，其一直都是太阳物理、等...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Realization of Boolean Control Networks
布尔控制网络 解耦问题 最小实现
2023/4/26
In this talk, we discuss the realization of Boolean control networks (BCNs) and apply obtained results to some decoupling problems. It is proved that the minimum realization (MR) of a BCN exists uniqu...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：AI时代的百度语音技术
AI时代 百度语音技术 深度学习
2023/4/26
在深度学习为主流的 AI 时代语音技术获得了突破性的进展，而百度作为最早进行语音技术研发的互联网企业，其语音技术一直处于业界的领先地位。百度语音技术部是百度内部唯一进行语音技术研发的部门，为百度搜索、地图、度秘、百度云等产品部门提供语音识别、合成、唤醒等语音技术，并且通过百度语音开放平台服务于万千开发者。本次报告将介绍百度语音技术部最近在各项语音技术上的最新进展，揭秘背后的黑科技。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Layer separation for the 3D Navier-Stokes equation in a bounded domain
有界域 三维 纳维-斯托克斯方程 层分离 NS方程
2023/4/26
We provide an unconditional $L^2$ upper bound for the boundary layer separation of 3D Leray--Hopf solutions in a smooth bounded domain. By layer separation, we mean the discrepancy between a (turbulen...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：隧道工程不良地质智能识别及灾变防控注浆模拟分析方法
隧道工程 不良地质 智能识别 灾变防控 注浆模拟分析
2023/4/27
随着交通强国等国家战略的实施，我国已成为世界上隧道建设规模和难度最大的国家。然而，隧道建设经常遭遇突水突泥、塌方、大变形等地质灾害，造成重大人员伤亡、严重经济损失和恶劣社会影响，断层、岩溶等不良地质和岩性接触带是隧道灾害发生的元凶和挑战。地质分析是岩性识别和不良地质超前预报最基本的方法，是其它预报方法解译的基础，但传统隧道内地质分析依赖于人工经验判断，主观性强，易出现误判漏判。本报告提出了基于图像...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Energy-preserving Mixed Finite Element Methods for a Ferrofluid Flow Model
铁磁流体 流动模型 节能混合 有限元方法
2023/4/27
We develop a class of mixed finite element methods for the ferrofluid flow model proposed by Shliomis [Soviet Physics JETP, 1972]. We show that the energy stability of the weak solutions to the model ...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：A LASSO-based Detection and Identification Method on Actuator Integrity Attacks in Remote Control Systems
LASSO 远程控制系统 执行器 完整性 攻击检测 识别方法
2023/4/28
We consider actuator attacks in a remote control system. Compared with sensor attacks that have been studied in most existing literature, the malicious attacks over actuators can cause more disastrous...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：语音技术的前沿进展及百度产业实践
语音技术 前沿进展 百度产业实践
2023/4/28
随着深度学习和通用GPU算力的快速提升，语音技术特别是语音识别技术逐渐伴随车载语音交互、家庭智能音箱等形式走进千家万户。本次讲座首先回顾语音识别的技术进展，介绍最新的端到端语音识别技术，然后分享百度在语音技术上的一些突破。希望能够通过此次报告让大家了解语音技术的基本组成和技术路线，以及产业界在语音技术上的各类应用和进展。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Bayesian Approach to Determining the Orientation of Sound-soft Obstacles with Phaseless Data via Wasserstein Distance
Wasserstein距离 贝叶斯方法 无相数据 软声障碍物
2023/4/27
We present a Bayesian approach to inverse scattering problems of reconstructing the rotation angle in clockwise direction of an acoustically sound-soft obstacle from phaseless far-field data in two di...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Resolvent problem for linearized compressible Navier-Stokes equations with free surface
自由曲面 线性可压缩 纳维-斯托克斯方程 解问题
2023/4/28
In this talk, we will discuss the resolvent problem for the linearized one of the free surface problem of compressible, viscous and heat-conducting fluid, which is a problem in an infinite strip domai...