Upcoming events

03 April 2023 15:45 till 17:45

[STAT/AP] Zsolt Bartha

05 April 2023 12:45 till 13:30

[Lunch Colloquium] Bas Janssens: Mirrors, Spin, and General Relativity

Spin groups describe how fermions transform under rotations, Pin groups describe how they transform under reflections. Although the Spin group is essentially unique, there exist no less than eight distinct Pin groups. We argue that only two of these are compatible with general relativity.

05 April 2023 14:00 till 15:00

[DMO] Siv Sørensen: Topology reconstruction using time series data in telecommunication networks

We consider Hybrid fiber-coaxial (HFC) networks in which data is transmitted from a root node to a set of customers using a series of splitters and coaxial cable lines that make up a general (non-binary) tree. The physical locations of the components in a HFC network are always known but frequently the cabling is not. This makes cable faults difficult to locate and resolve. In this study we consider time series data received by customer modems, to reconstruct the topology of HFC networks. We assume that the data can be translated into a series of events, and that two customers sharing many connections in the network will observe many similar events. This approach allows us to use maximum parsimony to minimize the total number of character-state changes in a tree based on observations in the leaf nodes. Furthermore, we assume that nodes located physically close to each other have a larger probability of being connected. Hence, our objective is a weighted sum of data distance and physical distance. A variable-neighborhood search heuristic is presented for minimizing the combined distance. Furthermore, three greedy heuristics are proposed for finding an initial solution. Computational results are reported for both real-life and synthetic customer data with various degrees of background noise, showing that we are able to reconstruct the topology with a very high precision.

06 April 2023 16:00 till 17:00

[PDE & Applications seminar] Johan Dubbeldam: Using mathematical modeling and game theory to optimize therapy in cancer patients

In this talk I will present a game-theoretic model of a cancer cell population where the treatment-induced resistance is a quantitative evolving trait and the sensitive and resistant cancer cells compete with each other. We first investigate whether a constant treatment dose can stabilize the tumor burden at an acceptable level. When stabilization is possible, we expand the model into a Stackelberg evolutionary game (SEG), with the physician as the leader and the cancer cells as followers. Here the physician chooses a treatment dose to maximize the patient's quality of life, while the cancer cells evolve resistance to the treatment in order to better proliferate and survive. We find the Nash and Stackelberg equilibria of the SEG game, corresponding to the ecological (or ecologically enlightened) therapy and evolutionary (or evolutionarily enlightened) therapy, respectively, and compare them to the outcomes of applying the maximum tolerable dose (MTD). Finally, some recent work about applying control theory to these models will be discussed. This work was done in collaboration with Hasti Garjani, Frederik Thomsen and Katerina Stankova, Monica Salvioli

17 April 2023 15:45 till 17:45

[STAT/AP] Paulo Serra: Uncertainty quantification in sparse quantile regression

20 April 2023 16:00 till 17:00

[PDE & Applications seminar] Zivorad Tomovski: Fractional Poisson process and Applications

The name fractional Poisson process is due to Laskin 2003 who
derived the
one point counting distribution. The renewal process of Mittag Leffler
type was discussed by Gorenflo, Mainardi and Scalas in two papers
published in 2004 one of them specifically devoted to the process and
published
on the Vietnam Journal of Mathematics. Hilfer and Anton 1995 were the first
to recognize the relation between the Mittag Leffler function and the time
fractional diffusion equation. The use of the Mittag Leffler function in
this
framework can be traced back to works of Gnedenko and Kovalenko 1968 on
thinning and Balakrishnan 1985 on anomalous diffusion. We will discuss
fractional
Poisson process by considering Hilfer-Prabhakar derivative in
difference-differential equations governing the dynamics of generalized
renewal stochastic processes.

04 May 2023 16:00 till 17:00

[PDE & Applications seminar] Tim Laux: TBA

TBA

08 May 2023 15:45 till 17:45

[STAT/AP] Christian Maes: Nonequilibrium calorimetry

This is a joint project started some time ago already with Karel Netocny (Academy of Sciences, Prague). Recently we got more examples and more results, especially concerning the low temperature behavior of driven systems. Such systems create an Escherian world where heat is no longer able to order the states.

We prove a Third Law for a class of Markov jump processes and we make some progress in associating heat capacities to graphs and networks.,

Reference:

Faezeh Khodabandehlou, Christian Maes, Irene Maes and Karel Netočný, The vanishing of excess heat for nonequilibrium processes reaching zero ambient temperature, arXiv:2210.09858v1 [cond-mat.stat-mech].

10 May 2023 12:45 till 13:30

[Lunch Colloquium] Anurag Bishnoi: Codes, blocking sets and graphs

I will survey the recent bounds on linear trifferent codes and minimal codes that we have obtained by using equivalences with finite geometric objects called blocking sets. I will also discuss a new explicit construction of all of these objects, based on expander graphs and asymptotically good codes.

11 May 2023 16:00 till 17:00

[PDE & Applications seminar] Katharina Klioba: TBA

TBA

15 May 2023 15:45 till 17:45

[STAT/AP] Pim van den Hoorn

01 June 2023 16:00 till 17:00

[PDE & Applications seminar] Anastasiia Hraivoronska: TBA

TBA

12 June 2023 15:45 till 17:45

[STAT/AP] Peyman Mojaherin Esfahani

14 June 2023 12:45 till 13:30

[Lunch Colloquium] Matthias Möller: Solving real-world problems with quantum annealers

15 June 2023 16:00 till 17:00

[PDE & Applications seminar] Ivan Kryven: TBA

TBA

19 June 2023 15:45 till 17:45

[STAT/AP] Stephanie van der Pas

29 June 2023 16:00 till 17:00

[PDE & Applications seminar] Katharina Eichinger: TBA

TBA

07 August 2023 09:00 till 10 August 2023 17:00

TU Delft Mathematics Summer School

The TU Delft summer school offers an incredible opportunity to develop your mathematical skills, explore new mathematical concepts, and review topics seen in high school to set you up for success in your studies. With engaging lectures, interactive discussions, and hands-on problem-solving sessions, you'll gain a deep understanding of key mathematical concepts and their applications, all while having fun and meeting your new peers! The summer school is designed for students that will start with their bachelor's studies in the 2023 - 2024 academic year.