CIAO seminar: Hyperbolic polynomials and semidefinite programming

Speaker: Dr James Saunderson
Monash University

Time and Location: Thursday, 19 October, 10:30 AM, T121, T Building, Mt Helen Campus (Federation University)

Title: Hyperbolic polynomials and semidefinite programming

Abstract: Hyperbolic polynomials are multivariate homogeneous polynomials with certain real-rootedness properties, such as the determinant restricted to symmetric matrices. First identified in the context of PDEs, they now play a role in numerous areas, including theoretical computer science, probability theory, and optimisation. Associated with any hyperbolic polynomial is a convex `hyperbolicity’ cone. The resulting conic optimisation problems are called hyperbolic programs.

Please contact Julien Ugon regarding the Visimeet connection. RMIT crowd please make your own arrangements with AGR booking/Visimeet connection.

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CSIT Seminar: Prof. Yuhui Shi, Introduction to Brain Storm Optimization Algorithms

CSIT Seminar

Speaker: Prof. Yuhui Shi
Southern University of Science and Technology (SUSTech), Shenzhen, China
Title: Introduction to Brain Storm Optimization Algorithms

Date: Tuesday 3 October 2017
Time: 11:30 – 12:30
Venue: 09.03.12 (Building 9, Level 3, Room 12), RMIT City Campus

Abstract: Swarm intelligence (SI) algorithms, a collection of population-based optimization algorithms, have been being designed and researched to solve problems which are very difficult, if not impossible, for traditional optimization approaches such as hill-climbing approaches to solve. Most existing SI algorithms are nature-inspired and/or bio-inspired, especially are inspired by objects with low level intelligence. Inspired by the brainstorming process, one of the human being problem solving skills, in the year 2011, the brain storm optimization (BSO) algorithm, a new population-based swarm intelligence algorithm, was developed. In this talk, the brainstorming process will be introduced first, followed by the development of the brain storm optimization algorithm; then new advances on BSO will be presented; finally, the BSOs will be looked at from the developmental learning perspective.

Bio: Dr. Yuhui Shi is a Chair Professor in the Department of Computer Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, China. Before joining SUSTech, he was with the Department of Electrical and Electronic Engineering at the Xi’an Jiaotong-Liverpool University (XJTLU), Suzhou, China, from January 2008 to August 2017, and was with the Electronic Data Systems Corporation (EDS), Indiana, USA, from October 1998 to December 2007. He is an IEEE Fellow, the Editor-in-Chief of the International Journal of Swarm Intelligence Research, and an Associate Editor of the IEEE Transactions on Evolutionary Computation. Dr. Shi co-authored a book on Swarm Intelligence together with Dr. James Kennedy and Dr. Russell C. Eberhart, and another book on Computational Intelligence: Concept to Implementation together with Dr. Russell C. Eberhart.

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Nigel Clay: Ensuring Blood is Available When it is Needed Most

Nigel Clay: Ensuring Blood is Available When it is Needed Most

Dear Optimisation group members,

Please note the following Biomodelling talk tomorrow (Friday 22 September) that may be of your interest.

Speaker: Nigel Clay
School of Science, RMIT University

Title: Ensuring Blood is Available When it is Needed Most

Date and time: Friday 22 September 2017, 3:00–4:00pm
Location: Building 8 Level 9 Room 66 (AGR) RMIT City campus

Abstract: A robust supply Red Blood Cells (RBCs) is needed to meet patient demand for transfusion. The quantity of blood transfused is doubly stochastic as both the number of patients needing transfusion and the quantity of blood a patient needs are random. We define a shortage as the situation where RBCs are needed for transfusion but none are available. Shortages may arise because unused RBCs perish, and/or because the supply of RBCs is not sufficient to cover demand. For hospitals, the supply of fresh RBCs comes from the Blood Bank. However, the Blood Bank has to rely on donations which are also stochastic. Further, once a donor has given whole blood they are ineligible to do so again for 84 days. Therefore, to ensure a robust supply of RBCs is available is important to ensure that a sufficient quantity of donors are available to give blood. Read more

RMITOpt-SPACE meeting: Dr Elisa Maria Alessi: Passive End-of-Life Solutions for Low Earth Orbits

RMITOpt-SPACE meeting: Dr Elisa Maria Alessi: Passive End-of-Life Solutions  for Low Earth Orbits

Speaker: Dr Elisa Maria Alessi
Istituto di Fisica Applicata “Nello Carrara” (IFAC),
Consiglio Nazionale delle Ricerche (CNR), Italy

Title: Passive End-of-Life Solutions for Low Earth Orbits

Date and time: Monday 9 October 2017, 3:30–4:30pm – note unusual day and time
Location: Building 8 Level 9 Room 66 (AGR) RMIT City campus

Abstract: The growing awareness of the space debris problem has motivated the scientific community to look for effective and feasible active and passive end-of-life disposal solutions for spacecraft orbiting the Earth, in particular the Low Earth Orbit (LEO) region. It is now recognized the idea that the mission design must comprise end-of-life strategies to preserve the space environment and for the sustainability of the whole program. To this end and to make it affordable, it is mandatory to achieve a deep understanding of the dynamics pervading the circumterrestrial space. Starting from an explanatory introduction on the problem and on the worlwide effort, the talk will address the recent advancements obtained in the framework of the ReDSHIFT H2020 project concerning the dynamical mapping of the LEO region, by means of extensive numerical simulations and analytical studies of the resonances due to solar radiation pressure and third-body perturbations. Read more

RMITOpt-SPACE meeting: Dr Pierfrancesco Di Cintio, Chaos, noise, discreteness effects and the continuum limit in N-body systems, revisited

RMITOpt-SPACE meeting: Dr Pierfrancesco Di Cintio, Chaos, noise, discreteness effects and the continuum limit in N-body systems, revisited

Speaker: Dr Pierfrancesco Di Cintio
Institute of Applied Physics of the National Council of Research (IFAC-CNR)
Title: Chaos, noise, discreteness effects and the continuum limit in N-body systems, revisited
Date and time: Monday 2 October 2017, 3:30–4:30pm – note unusual day and time
Location: Building 8 Level 9 Room 66 (AGR) RMIT City campus

Abstract: In this talk I will question the validity of the continuum limit and the use of frozen N-body realizations to obtain qualitative information on particle orbits in large N gravitational system in stellar dynamics. With the aid of detailed numerical simulations with refined symplectic integrators developed in the context of numerical celestial mechanics, I will compare orbits in frozen potentials with orbits in self consistent equilibrium models. In addition, I will show some results that could be relevant for the physics of charged particle beams. Read more

CANCELLED: Reinout Quispel, Geometric numerical integration: how to discretize differential equations while preserving their physical properties

CANCELLED: Reinout Quispel, Geometric numerical integration: how to discretize differential equations while preserving their physical properties

THIS TALK IS CANCELLED

Speaker: Prof. Reinout Quispel
La Trobe University
Title: Geometric numerical integration: how to discretize differential equations while preserving their physical properties
Date and time: Friday 13 October 2017, 3:00–4:00pm
Location: Building 8 Level 9 Room 66 (AGR) RMIT City campus

Abstract:
In this talk we give a survey of geometric numerical integration, i.e. the numerical solution of differential equations while preserving one or more of their physical properties exactly, i.e. up to round-off error. Properties that can be preserved include symplectic structure, energy and other first integrals, phase space volume, symmetries, dissipation, etc.

Bio:

1976
B.Sc. University of Utrecht, The Netherlands.
1979
M.Sc. University of Utrecht.
1979–1983
Research Associate at Leiden University, The Netherlands.
1983
Ph.D, Leiden University. Title of Thesis: “Linear Integral Equations and Soliton Systems”, supervisor: Hans W. Capel.
1983–1985
Postdoctoral Fellow at Twente University, The Netherlands.
1985–1986
Assistant Professor at Department of Mathematics, Utrecht University.
1986–1990
(Senior) Research Fellow at Australian National University.
1990–2003
Lecturer/Senior Lecturer/Reader at La Trobe University, Department of Mathematics.
2000
Reader at University of Cambridge (visiting position at DAMTP from April until July).
2004–present
Professor of Mathematics at La Trobe University.
2008–2012
ARC Australian Professorial Fellowship.
2013
Onsager Professorship and Medal (Norwegian University of Science and Technology, Trondheim).
2014–2016
ARC Distinguished Outstanding Researcher Award.

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Walter Kozlowski, Common fixed points of semigroups of monotone nonexpansive nonlinear mappings in Banach spaces

Walter Kozlowski, Common fixed points of semigroups of monotone nonexpansive nonlinear mappings in Banach spaces

Speaker: Walter Kozlowski
University of New South Wales
Title: Common fixed points of semigroups of monotone nonexpansive nonlinear mappings in Banach spaces
Date and time: Friday 8 September 2017, 3:00–4:00pm
Location: Building 8 Level 9 Room 66 (AGR) RMIT City campus

Abstract:
We consider semigroups of nonlinear mappings acting in Banach spaces equipped with a partial order. We assume that these mappings are monotone and nonexpansive on elements comparable in the order sense. We will discuss existence of common fixed points for such semigroups as well as algorithms for construction of such fixed points. We will also touch upon applications to differential equations and dynamical systems. Read more

IMO2017 session on 4 September

IMO2017 session on 4 September

After the successful meeting on Putnam problems last Monday we are continuing the theme with International Mathematical Olympiad problems.

Topic: International Mathematical Olympiad 2017 (IMO2017) problems
Time and Venue: Monday 4 September 3:30pm, AGR 8.9.66
Description: Download the problems in your favourite language: https://www.imo-official.org/year_info.aspx?year=2017 and try solving them before the meeting. During the meeting we will discuss the solutions.
Coordinator: Ben Haire.

Dr Irene Strodthoff, Bushfires and the community in Chile and Australia

Dear Optimisation Group members,

Please note the following seminar talk given by Dr Irene Strodthoff who is currently visiting Prof. John Handmer at RMIT.

Speaker: Dr Irene Strodthoff
Visiting researcher at the Risk and Community Safety research program, School of Science, RMIT University & Academia Nacional de Estudios Politicos y Estrategicos (ANEPE), Chile
Time and venue: Friday 1 September, 2-4pm, Board Room 325, La Trobe City Campus, 215 Franklin St, opposite Victoria Market.
Title: Bushfires and the community in Chile and Australia: How cultural and governmental contexts have an impact on preparedness and response

For the information on this and other seminars of the Institute of Latin American Studies (ILAS) of La Trobe University, Download flyer.

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