South African Numerical and Applied Mathematics (SANUM) is a special interest group for South African and international academics in the areas of applied mathematics, numerical analysis, and scientific computing, and a yearly (typically three-day) symposium with presentations and posters on these and related topics.
The symposium currently rotates between three host institutions: Stellenbosch University, the University of Pretoria, and the University of the Witwatersrand. It serves as the annual symposium for the Numerical and Applied Mathematics research theme of the NRF Centre of Excellence in Mathematical and Statistical Sciences (CoE MaSS).
SANUM2020 will be held at Stellenbosch University on 25-27 March 2020. Poster available here.
Registration is now OPEN! Early bird registration ends 31 January 2020.
Please submit titles and abstracts here. Deadline 24 February, 2020.
The 2020 African Women in Mathematics Conference (AWiM) is taking place in Stellenbosch before SANUM (on the 23rd and 24th of March) in the same venue and will overlap on the 25th of March with joint plenary speakers. Registered delegates are welcome to attend sessions from either conference on the 25th of March. A poster for AWiM can be found here. A small discount is available to delegates attending both conferences. Please contact the organisers for futher details.
We are pleased to announce the confirmed plenary speakers below.
A widespread approach for tsunami simulation is to model the ocean with the shallow water equations (SWE). The steady-state ocean floor deformation that results from a seismic event is often used as the initial ocean surface profile for the SWE, taking advantage of the separation of the tsunami and seismic timescales when the event occurs far from the inundation area of interest. This work focuses instead on tsunamis generated by near-field seismic events and the data that might be measured by proposed seafloor sensors for use in tsunami early warning, as part of a project to study the feasibility and utility of an offshore network of sensors on the Cascadia Subduction Zone (cascadiaoffshore.org). The dynamic seismic/acoustic and tsunami waves are simulated by modeling the ground as an elastic solid that is coupled with an acoustic ocean layer. A gravity term is added to the ocean layer in order to capture the tsunami (gravity waves) that are generated by the acoustic waves. The AMRClaw and Geoclaw (www.clawpack.org) packages are used to simulate the resulting waves, and to explore some of the issues that arise.
It is important in many areas of science and engineering to be able to predict and simulate rare events with very small probabilities, say of the order of 10^-10, but whose occurrence may have negative or even catastrophic consequences. Examples include internet server overflows, mechanical breakdowns, floods, and financial crashes. Rare events can also have positive effects, for example, when triggering chemical reactions or driving genetic evolution via random mutations. In these examples, it is important not only to estimate the probability of rare events, but also to predict how these events happen following specific trajectories or mechanisms, called transition pathways.
Of course, one can't just simulate a given system to 'see' rare events, since they're rare! New types of simulations are required and usually involve biasing the system artificially to render a rare event typical. In this talk, I will give an overview of recent algorithms that have been developed in statistics, engineering, and physics to efficiently simulate rare events in Markov processes. I will focus on algorithms based on importance sampling, a general biasing technique for which optimality results can be obtained in the context of a theory of rare events known as large deviation theory.
We are pleased to announce the following special sessions at SANUM2020:
The aim of this special session is to promote the wide range of activities taking place in industrial mathematics in South Africa. Presentations in all areas of numerical and analytical mathematics (including optimization, control theory, image processing, fluid and solid mechanics) applied to industrial problems will be considered. Problems containing substantial mathematical modelling will be particularly welcome. All branches of South African industry will be considered, including manufacturing, mining, conservation and renewable energy, wine industry, sugar industry, iron and steel, and leisure industries such as sport and tourism.
If you are interested in presenting in this session, please contact Ashleigh Hutchinson at firstname.lastname@example.org.
The scope of this session is broad enough to cover almost anything solved by Maxwell's equations.
If you are interested in presenting in this session, please contact Dirk de Villiers at email@example.com.
Dirk Laurie, formerly of Northwest University and Stellenbosch University, sadly passed away in August 2019. Throughout his career, Dirk was a prominent figure in South African numerical analysis, and devoted supporter of the SANUM series. This special session of invited talks will be presented in his honour.
It is with great sadness that we report that Dirk Laurie passed away on August 10 2019, after struggling with his health the past six months or so. A student of AR (Ron) Mitchell, Dirk graduated with a Ph.D. from the University of Dundee in 1977. He was a researcher at the National Research Institute for Mathematical Sciences in South Africa, and held chairs at the Potchefstroom University for Christian Higher Education (these days Northwest University), as well as Stellenbosch University. Dirk made significant contributions to a number of areas in numerical analysis, including quadrature and linear algebra. He was one of five solo- winners of the SIAM 100-digit challenge of 2002 and a co-author of the related bestselling book. One of his passions was the South African Mathematics Olympiad, and he accompanied the national team on several occasions to the IMO.
Outside of mathematics, his interests were numerous: Chess (South African schools champion), music (choir singing, playing the recorder, and general aficionado), cryptic crosswords (both their compilation and their physical outlay by the LaTeX package he created), and puzzle solving in general. In his younger days, he was a familiar face on South African television, where he participated in general knowledge quiz shows and also served as a pundit during elections. Up to his death, Dirk was editor- in-chief (and founding member) of the first online journal for scientific research papers published in Afrikaans, a language he was passionate about.
Dirk is survived by his wife, Trienke, and five sons.