Martijn Gösgens

PhD Candidate at Eindhoven University of Technology

Research

Link to my Google Scholar profile.

Community detection

My research mainly focuses on detecting communities in complex networks. Communities are groups of nodes that are more densely connected internally than externally. Such communities could, for example, correspond to groups of friends on social media or fields of study in citation networks. There are many heuristic algorithms for community detection, but there is limited understanding about which algorithm works well on what network.

Validating validation measures

For many machine learning tasks, there exist many measures to quantify the similarity between two outcomes. These measures are used to validate the performance of a machine learning algorithm by measuring the similarity between the outcome of the algorithm and the desired ('true') outcome. However, there are many of these validation measures, making it difficult to decide which one to use. This choice is especially important, since many of these validation measures have inherent biases towards certain outcomes, which may lead to an unfair or suboptimal algorithm being chosen in practice.

For the machine learning tasks of clustering and classification, we mathematically analyzed the most popular validation measures, which led to recommendations about which measure to use in what setting. This resulted in two papers that were published at ICML2021 and NeurIPS2021, regarding the clustering and classification task respectively.

Epidemiological modeling for COVID-19

Since the start of the COVID-19 pandemic, we have been modeling the effect of mobility in the spread of the infections. This led to this publication in JRSI. An interview about this project can be found in this article by the Cursor

Preventive maintenance (Bachelor thesis)

For the completion of the Bachelor Applied Mathematics, I analysed a stochastic degradation model and created an algorithm to obtain the optimal maintenance policy. This work has been rewarded with a 9.5/10. The thesis can be found here.

Experience

Eindhoven University of Technology

PhD Candidate

My PhD project focuses on community detection in complex networks. This project is supervised by Nelly Litvak and Remco van der Hofstad.

For the Network Pages, a project by the Networks Center, I develop interactive visualizations that help explain network theory in a way that can be understood by non-mathematicians. An example of such a visualization is given below, taken from this blogpost about bottleneck detection algorithms.

2020 - Now

Eindhoven University of Technology

Student Assistant

As a student assistent, I assisted lecturers with various teaching tasks such as supervising student projects and grading assignments.

2015 - 2020

ViNotion

Software Engineer

ViNotion is a specialist in the field of automated video content analysis that uses image recognition to analyze traffic. For ViNotion I used a game engine to generate synthetic datasets with ground truth. This data can be used to validate the performance of the products and to experiment with training on synthetic data.

2018 - 2020

Wolfpack

Software Developer
Projects:
  • MedApp: an iOS app to assist patients in taking their medicines. Among others, the app notifies patients when to take their medicines and allows them to order new medicines directly from their pharmacy.
  • ISAAC’s Project Time Management system: a web application that allows employees to log the hours that they have worked and provides clients and project managers insight in the progress of their projects.

2016 - 2017

AthenaStudies

Tutor

For AthenaStudies, I gave exam trainings to help a group of first year Industrial Engineering students prepare for their mathematics resit.

February 2015 - July 2015

Education

Eindhoven University of Technology

MSc Industrial and Applied Mathematics (Cum laude)

With a specialization in Statistics, Probability and Operations Research. During this master, I did a 3-month internship at Yandex and MIPT in Moscow.

2018 - 2020

Eindhoven University of Technology

BSc Applied Mathematics (Cum laude)
2014 - 2018

Eindhoven University of Technology

BSc Software Science (Cum laude)
2014 - 2018

Software Skills

Interests

Music

I play bass guitar in the band Random Precision with which we have been playing on various events at the TU/e campus.

Furthermore, together with a friend, we have been writing electronic music under the artist name Lofi Royale.

Brewing beer

Together with a friend, we have been occasionally brewing beer in the last few years. The beer is unfortunately not commercially available.

Programming

I also enjoy programming and software development. An example of one of my hobby projects is NetSweeper, a network-based variant of Minesweeper. The game can be played here.