『運籌OR帷幄』原創
作者：運籌OR帷幄
編者按
近期有許多高校組織了多場線上學術報告，這對於非在校生來說是非常好的學習交流的機會。本文蒐羅了北大、復旦、上交三所高校官網發佈的會議報告信息，集中於數學與優化領域，有興趣的朋友也可以關注大學官網搜索更多信息。另外，關於國內外的運籌學大會及暑校信息的日曆正在完善中，我們也會實時跟蹤和更新會議信息。歡迎感興趣的朋友關注我們的知乎賬號【運籌OR帷幄】，一鍵查取所需。
會議國際版鏈接：
https://zhuanlan.zhihu.com/p/133080115
會議國內版鏈接：
https://zhuanlan.zhihu.com/p/114250462
北京大學
Probability Seminar——Prediction of the COVID-19 outbreak with a new stochastic dynamic model
報告人：Zhang Yuan (Peking University)
時間：2020-4-20 14:00-15:00
地點：zoom會議 (ID：699 3781 2230)
(鏈接：https://zoom.com.cn/j/69937812230)
Abstract: The current outbreak of coronavirus disease 2019 (COVID-19) has become a global crisis due to its quick and wide spread over the world. A good understanding of the dynamic of the disease would greatly enhance the control and prevention of COVID-19. In this talk, I will discuss a novel stochastic model we proposed which aims to account for the unique transmission dynamicsof COVID-19 and capture the effects of intervention measures. Our major findings includes: (1) instead of aberration, there is a remarkable amount of asymptomatic virus carriers, (2) a virus carrier with symptoms is approximately twice more likely to pass the disease to others than that of an asymptomatic virus carrier. We also apply our model to predict the size of outbreaks in some major countries as well as the risk of oversea imported cases. This talk is based on joint works with Dr. Chong You, Mr. Zhenhao Cai, Mr. Jiarui Sun, Mr. Wenjie Hu, and Dr. Xiaohua Zhou.
Geometric Analysis and Mathematical General Relativity Seminar——On Gromov’s conjecture of fill-ins with nonnegative scalar curvature
報告人：Prof. Yuguang Shi (Peking University )
時間：2020-4-20 14:30-16:30
地點：騰訊會議( ID 121 696 029 )
鏈接：
https://meeting.tencent.com/s/5041SWQ65c99
Abstract：Let (\mathrm{\Sigma}^{n-1},\gamma) be an orientable (n-1)-dimensional Riemannian manifold, H be a positive function on \mathrm{\Sigma}^{n-1}, it is natural to ask: under what conditions is it that \gamma is induced by a Riemannian metric g with nonnegative scalar curvature, for example, defined on \mathrm{\Omega}^n, and H is the mean curvature of \mathrm{\Sigma} in (\mathrm{\Omega}^n,g) with respect to the outward unit normal vector? Recently, M.Gromov proposed several conjectures on this question. In this first part of this talk I will describe what the conjectures are and survey some known results in this direction when n=3; In the second part of the talk, I will present my several recent results on this which joint with Wang Wenlong, Wei guodong ， and Zhu jintian. I will also propose some problems relate to Gromov’s conjectures.
CAM Seminar—Kalman-Wasserstein Gradient Flows
報告人：Franca Hoffmann (Caltech)
時間：2020-04-21 16:00
地點：Cisco Webex Meeting
(會議號：184 117 968 會議密碼：math)
會議鏈接：https://pku.webex.com.cn/pku/j.php？MTID=m7aafbbedc8b898662e9fc39b9882f1c5
Abstract: We study a class of interacting particle systems that may be used for optimization. By considering the mean-field limit one obtains a nonlinear Fokker-Planck equation. This equation exhibits a gradient structure in probability space, based on a modified Wasserstein distance which reflects particle correlations: the Kalman-Wasserstein metric. This setting gives rise to a methodology for calibrating and quantifying uncertainty for parameters appearing in complex computer models which are expensive to run, and cannot readily be differentiated. This is achieved by connecting the interacting particle system to ensemble Kalman methods for inverse problems. This is joint work with Alfredo Garbuno-Inigo (Caltech), Wuchen Li (UCLA) and Andrew Stuart (Caltech).
Information Sciences Seminar——橢球排列的完全分類及快速判定
報告人：賈曉紅（中科院數學與系統科學研究院）
時間：2020-4-30 15：00
地點：Zoom 會議（會議 ID：898 317 2484）
鏈接：https://zoom.com.cn/j/8983172484
摘要：幾何體的排列反映了幾何體的位置關係和對空間的劃分方式，廣泛應用於CAD/CAM、機器人、分子模擬、計算物理、激光手術等領域。橢球是這些環境中用於形體逼近的理想包圍體，我們將給出兩橢球的排列在微分同胚意義下的分類、窮舉、代數判定條件、符號判定算法，以及在連續運動及變形下橢球排列變化的連通圖；並以此探索符號計算在幾何形態判定及更廣泛的工業環境中的應用。
報告人簡介：賈曉紅，中科院數學與系統科學研究院副研究員，主要研究方向為計算代數幾何與計算機輔助幾何設計。
Distinguished Colloquium——Interacting Particle Systems: random batch methods for classical and quantum N-body problems and non-convex optimization
報告人：Prof. Shi Jin (Shanghai Jiao Tong University)
時間：2020-05-15 14:00-15:00
地點：會議ID：307-355-784；
騰訊會議：
https://meeting.tencent.com/s/5CYv2EI59b2c
Abstract: We first develop random batch methods for classical and quantum interacting particle systems with large number of particles. These methods use small but random batches for particle interactions, thus the computational cost is reduced from O(N^2) per time step to O(N), for a system with N particles with binary interactions. For classical particles we give a particle number independent error estimate under some special interactions. For quantum N-body Schrodinger equation, we obtain, for pair-wise random interactions, a convergence estimate for the Wigner transform of the single-particle reduced density matrix of the particle system at time t that is uniform in N > 1 and independent of the Planck constant\hbar.
We then introduce a stochastic interacting particle consensus system for global optimization of high dimensional non-convex functions.This algorithm does not use gradient of the function thus is suitable for non-smooth functions. We prove that under dimension-independent conditions on the parameters and initial data the algorithms converge to the neighborhood of the global minimum almost surely.
Bio: 金石，現為上海交通大學自然科學研究院院長，數學學院講席教授。先後獲北京大學學士學位，美國亞利桑那大學博士學位，歷任美國紐約大學庫朗數學研究所博士後，美國佐治亞理工學院助理教授、副教授，美國威斯康星大學（麥迪遜）正教授，數學系系主任，Vilas 傑出成就教授，上海交通大學數學系講席教授、系主任。他同時擔任上海應用數學中心聯合主任，上海交通大學教育部科學工程計算重點實驗室主任與人工智能數學基礎中心主任。他曾獲得馮康科學計算獎。他是美國數學會（AMS）首批會士，工業與應用數學學會(SIAM)會士，及2018年國際數學家大會邀請報告人。他的研究方向包括動理學理論，雙曲型守恆律，高頻波計算，量子動力學，不確定量化，粒子系統， 計算流體力學等。
復旦大學
An axiomatic foundation for the Expected Shortfall
報 告 人： 王若度 博士
報告人所在單位：University of Waterloo
報告日期： 2020-04-19 星期日
報告時間： 10:00-11:30
報告地點： Online seminar
報告摘要：Zoom會議號: 976 866 31920
會議密碼: 888888
鏈接: https://zoom.com.cn/j/97686631920
內容簡介：關於ES的公理基礎
報告人介紹：Ruodu Wang is University Research Chair and Associate Professor of Actuarial Science at the University of Waterloo in Canada. He holds editorial positions in leading journals in actuarial science,including Co-Editor of the European Actuarial Journal, and Co-Editor of ASTIN Bulletin。He received the Golden Jubilee Research Excellence Award from the Faculty of Mathematics at Waterloo in 2017 and one of Canada’s 125 Discovery Accelerator Supplement Awards from the Natural Sciences and Engineering Research Council in 2018.
APPLICATIONS OF HODGE THEORY IN MATROID THEORY #2
報 告 人： Prof. Jinsong Xu
報告人所在單位： Xi'An Jiaotong-Liverpool University
報告日期： 2020-04-23 星期四
報告時間： 15:00-16:30
報告地點： Online seminar
報告摘要： Tencent Meeting ID：488 583 742
Hodge theory is an important tool in the study of topology of complex algebraic varieties. Recently, due to the work of Karim Adiprasito, Matthew Baker, June Huh and Eric Katz and Botong Wang,etc., it has found several surprising applications to some well known problems in the theory of matroids.
In this expository talk, we will introduce related background and idea, and describe how this fancy approach of Hodge theory can be applied to solve a problem in combinatorics. We will also try to presentsome detailsifpossible.
午間學術報告會（一百一十八）：閒聊疫情、模型和投資
報 告 人： 陳文斌 教授
報告人所在單位： 復旦大學數學科學學院
報告日期： 2020-04-24 星期五
報告時間： 13:30-14:30
報告地點： Online seminar
報告摘要： 騰訊會議 ID: 111 524 047
點擊鏈接直接加入會議：
https://meeting.tencent.com/s/5OcV4du5ed0c
上海交通大學
[INS COLLOQUIUM] Quantum Linear Algebra
時間：2020-04-21 10:30 — 11:30
地點：Zoom APP
報告人：Lin Lin
單位：University of California, Berkeley
邀請人：INS
備註：Conference ID: 477-554-908 PIN Code: 250866
報告摘要：
As the “quantum supremacy” was declared by Google in 2019, we are now in the “noisy intermediate-scale quantum” (NISQ) era. What can a numerical analyst do with a quantum computer (if it works)? This talk discusses some recent progresses on quantum algorithms for solving linear algebra problems. In particular, we introduce simple algorithms based on adiabatic quantum computing (AQC) to solve Ax=bAx=b on a quantum computer, with near-optimal complexity ~O(κ/ϵ)O~(κ/ϵ). Here κκ is the condition number, and ϵϵ is the target accuracy. No prior knowledge on quantum computing is needed.
[INS COLLOQUIUM] Mean Field Limits of Weakly Interacting Diffusions and Applications
時間：2020-04-24 16:00 — 17:00
地點：Zoom APP
報告人：Grigorios Pavliotis
單位：Imperial College London, UK
邀請人：INS
備註：Conference ID: 939-3301-2582 PIN Code: 326882
報告摘要
In this talk I will present some recent results on mean field limits for interacting diffusions. We will study, in particular, problems for which the mean field limit exhibits phase transitions, in the sense that the limiting McKean-Vlasov PDE can have more than one stationary states, at sufficiently strong interaction strengths. We provide a general characterization of first and second order phase transitions for mean field dynamics on the torus and we study fluctuations around the mean field limit. As a case study, we consider the combined mean field/homogenization limit for noisy Kuramoto oscillators. Applications of this type of dynamics to models for opinion formation and to sampling and optimization algorithms are also discussed.
2020 Spring Young Mathematician Forum
時間：April 18-19, 2020
機構：SMS, SJTU
摘要：The 2020 Spring Young Mathematician Forum will be held during April 18-19 at the School of Mathematical Sciences at Shanghai Jiao Tong University. The Forum aims to bring together outstanding young mathematicians to exchange ideas and promote communications in all areas of mathematics and statistics.
Due to the special situation, the workshop will be held as ZOOM online meeting this time.
April 18, Saturday
Zoom: 972 958 36579
Password: 764698
Click to Attend:
https://zoom.com.cn/j/97295836579
April 19, Sunday
Zoom: 988 548 60661
Password: 998585
Click to Attend:
https://zoom.com.cn/j/98854860661
本文為不完全統計，歡迎大家留言補充。另外校方同行們也歡迎隨時聯繫我們，及時發佈相關活動。
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