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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Filtrations and endomorphisms
过滤 自同态 Banach--Colmez spaces
2023/4/23
This is a periodic series learning seminar organized by Koji Shimizu and Shizhang Li on Banach--Colmez spaces held on each Monday at MCM110. More info can be found on the website.
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Heintze Karcher type inequalities on capillary hypersurfaces in hyperbolic space
双曲空间 毛细管超表面 海因茨·卡彻型不等式
2023/4/23
In this talk, I will introduce our recent result on Heintze Karcher type inequalities for capillary hypersurfaces supported on different types of umbilical hypersurfaces in hyperbolic space. I will in...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Applications of sublinear expanders
次线性 膨胀机 亚线性膨胀器
2023/4/23
We will introduce the sublinear expander and cover some applications of sublinear expander. Given a graph H, a balanced subdivision of H is a graph obtained from H by subdividing every edge the same n...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Exponential decay of intersection volume and applications
交叉体积 指数衰减 公制空间
2023/4/23
When two balls in a metric space have small intersection? We give some natural conditions to guarantee an exponential decay on the volume of such intersections. Our proof is conceptually simple, makin...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：现代交通管理中维修问题的运筹优化实践
现代交通管理 维修问题 运筹优化实践
2023/4/23
本次报告结合报告人团队在实践中的经验，探讨现代交通管理（如地铁、航空）中维修问题的难点，建模方法和算法设计。 如在航空发动机维修的管理优化中，由于航空发动机的维修和租赁管理存在难度大、费用高、周期长、不确定性强的特点，确定性优化方案存在明显的缺陷。报告人设计了基于近似动态规划的算法框架，项目落地后每年可节省期望成本达数千万人民币。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Topology optimization via implicit neural representations
隐式 神经表示 拓扑优化
2023/4/24
Along with the rapid development of artificial intelligence (AI) technology, scientific research enters a new era of AI. Topology optimization (TO) and AI technology are recently showing a growing tre...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：A decomposition of pollution intensity in China's value-added trade
中国 增值贸易 污染强度 分解
2023/4/24
Based on a multi-regional input-output model, this study explores the temporal changes and driving forces of China's environmental losses relative to its economic gains from international trade with e...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Worse than imagined: Unidentified virtual water flows in China
中国 不明身份 虚拟水流
2023/4/24
The impact of virtual water flows on regional water scarcity in China had been deeply discussed in previous research. However, these studies only focused on water quantity, the impact of virtual water...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：国民营养与粮食安全研究
国民营养 粮食安全 双重约束
2023/4/24
国民营养和粮食安全是关系国家经济发展和社会安全稳定的重大基础性和战略性问题。报告聚焦"国民膳食、营养、健康变迁与可持续发展"和"粮食可持续供需格局与保障"两大议题进行研讨,包括国民膳食营养特征和精准化评价与需求、基于营养健康和粮食安全的粮食中长期需求预测、营养健康导向的动物性食物与饲料粮需求、营养目标与资源环境双重约束的粮食供给优化、新技术支撑下粮食绿色控制与系统治理、新时代面向国民营养与粮食安全...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：On Kahler Ricci shrinker surfaces
Kahler Ricci 收缩机 表面
2023/4/23
We prove that any K?hler Ricci shrinker surface has bounded sectional curvature. Combining this estimate with earlier work by many authors, we provide a complete classification of all K?hler Ricci shr...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Probabilistic HIV Recency Classification -- A Logistic Regression without Labeled Individual Level Training Data
概率 HIV新近度分类 个人水平训练数据 逻辑回归
2023/4/24
Accurate HIV incidence estimation based on individual recent infection status (recent vs long-term infection) is important for monitoring the epidemic, targeting interventions to those at greatest ris...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：基于微分对策理论的航天器"追-逃-防"博弈控制策略研究
微分对策理论 航天器"追-逃-防" 博弈控制
2023/4/24
微分博弈是研究航天器轨道追逃问题的理论基础，最早应用于具有自主决策能力的双方完全信息追逃博弈的交战场景中。本报告将上述场景拓展为包括追击者、逃避者和防御者（追-逃-防）的三方完全信息博弈制导情形，首先介绍了一种基于微分对策理论的航天器三方博弈相对轨道动力学模型，继而阐述了一种利用极值原理的模型求解方法，并通过数值模拟进一步探讨了航天器"追-逃-防"完全信息博弈问题的最优解决方案。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Bootstrap-based Statistical Analysis for Multi-period Data-driven Inventory Models with Seasonal Demand
自举 统计分析 季节性需求 多周期数据 驱动库存模型
2023/4/24
We study multi-period inventory control systems in which managers face seasonal demands with unknown distributions and make inventory decisions based on past demand data. It can be shown that a data-d...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Energy stability of exponential time differencing schemes for the nonlocal Cahn-Hilliard equation
非局部 Cahn-Hilliard方程 指数时间 差分方案 能量稳定性
2023/4/24
In this talk, we consider a class of exponential time differencing (ETD) schemes for solving the nonlocal Cahn-Hilliard equation. We first use the Fourier collocation method to discretize the space do...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Global quasineutral Euler limit for the Vlasov-Poisson-Landau system with rarefaction waves
稀薄波 弗拉索夫-泊松-朗道系统 准中性 欧拉极限
2023/4/24
The formal limit of the one-dimensional Vlasov-Poisson-Landau (VPL) system in the combined small Knudsen and quasineutral regimes gives the compressible Euler system. In the talk I will present a rece...