Category Archives: Student

Three new NERDS papers with our master students: Failing our youngest, superblockify, women on wikipedia

We have 3 new papers that came out over the summer so far, on diverse, very interesting topics. The first authors in all 3 of these papers were our master students – showing how impactful good master projects can be:

  1. Failing Our Youngest: On the Biases, Pitfalls, and Risks in a Decision Support Algorithm Used for Child Protection, by T.M. Hansen, R. Sinatra, and V. Sekara, published at FAccT’24
    Through a freedom of information request, we accessed a new algorithm of Danish child protection services to aid caseworkers in identifying children at heightened risk of maltreatment, named Decision Support, and conduct an audit. We find that the algorithm has significant methodological flaws, suffers from information leakage, relies on inappropriate proxy values for maltreatment assessment, generates inconsistent risk scores, and exhibits age-based discrimination. Given these serious issues, we strongly advise against the use of this kind of algorithms in local government, municipal, and child protection settings, and we call for rigorous evaluation of such tools before implementation and for continual monitoring post-deployment by listing a series of specific recommendations.

    See also our accompanying policy paper published earlier.
  2. superblockify: A Python Package for Automated Generation, Visualization, and Analysis of Potential Superblocks in Cities, by C.M. Büth, A. Vybornova, and M. Szell, published in The Journal of Open Source Software (JOSS)
    superblockify is a Python package designed to assist in planning future Superblock implementations by partitioning an urban street network into Superblock-like neighborhoods and providing tools for visualizing and analyzing these partition results. A Superblock is a set of adjacent urban blocks where vehicular through traffic is prevented or pacified, giving priority to people walking and cycling. The potential Superblock blueprints
    and descriptive statistics generated by superblockify can be used by urban planners as a first step in a data-driven planning pipeline for future urban transformations, or by urban data scientists as an efficient computational method to evaluate potential Superblock partitions.


    The software is available at: superblockify.city
  3. Traces of Unequal Entry Requirement for Illustrious People on Wikipedia Based on their Gender, by L. Krivaa and M. Coscia, published in Advances in Complex Systems
    In this paper, we study issues of fair gender representations for people in history noted by multiple language editions of Wikipedia: are women underrepresented on Wikipedia? We do so via a combination of natural language processing and network science. Our results indicate that there is indeed a higher bar for women to have their own biographical page on Wikipedia: women are only included when they have more significant connections than men to the rest of the network. There are visible effects of the initiatives Wikipedia is taking to fix this issue, showing that the gap is narrowing, which validates our interpretation of the data.

NERDS at IC2S2’24 in Philly!

A tactical squad of 6 NERDS attended this year’s IC2S2 in Philly, and presented 9 works:

We are grateful to the organizers for the great event, and we look forward to IC2S2 coming back to scandinavia in 2025!

New NERDS paper on urban morphology & street network simplification

A new NERDS co-authored paper is out open-access in the Journal of Spatial Information Science (JOSIS): A shape-based heuristic for the detection of urban block artifacts in street networks, by Martin Fleischmann & Anastassia Vybornova.

a) Bridge, Amsterdam; b) Roundabout, Abidjan; c) Intersection, Kabul; d) Motorway, Vienna. Polygons classified as face artifacts are shown in red, and the OSM street network (without service roads) is shown in black. Face artifacts are polygons enclosed by street network geometries (in the case of OSM, lane centerlines) that do not represent morphological urban blocks, but instead are a result of detailed transportation-focused mapping of the streetscape. Map data (c) OpenStreetMap contributors (c) CARTO

a) Bridge, Amsterdam; b) Roundabout, Abidjan; c) Intersection, Kabul; d) Motorway, Vienna. Polygons classified as face artifacts are shown in red, and the OSM street network (without service roads) is shown in black. Face artifacts are polygons enclosed by street network geometries (in the case of OSM, lane centerlines) that do not represent morphological urban blocks, but instead are a result of detailed transportation-focused mapping of the streetscape. Map data (c) OpenStreetMap contributors (c) CARTO

We propose a cheap computational heuristic for the identification of ‘face artifacts’, i.e., geometries that are enclosed by transportation edges but do not represent urban blocks. Sounds cryptic? Just check out the picture – the artifacts (in red) might be painfully familiar to anyone who has worked with street network data. Our proposed heuristic, implemented open-source in momepy, is the first step towards a fully automated street network simplification workflow. Next steps coming up – stay tuned!

NERDS at ICWSM’24

This week, Arianna and Anders are representing NERDS at ICWSM in Buffalo, NY, with two freshly-published papers.

  1. Narratives of Collective Action in YouTube’s Discourse on Veganism, by A. Pera and L.M. Aiello. ICWSM’24.

    We studied vegan narratives on YouTube through the lens of a theoretical framework of moral narratitves. We studied how different narratives elicit different types of responses from video commenters, and found that videos advocating social activism are the most effective at stirring reactions marked by heightened linguistic markers that relate to collective action.
  2. The Persuasive Power of Large Language Models by A.G. Møller and L.M. Aiello. ICWSM’24.

    Can artificial agents interact with each other to reproduce human-like persuasive dialogue? And do the arguments they generate sound persuasive to humans? We used Llama2 to test different persuasion strategies, and asked humans to rate them. We found that arguments that included factual knowledge, markers of trust, expressions of support, and conveyed status were deemed most effective according to both humans and agents.

NERDS at Como Summer School and WebSci’24

Arianna and Anders participated to the first editions of the Computational Social Science Summer School in Como, presenting their work on the COCOONS project. Arianna, Daniele, and external collaborator Maddalena Torricelli also attended the WebSci conference in Stuttgard, presenting an analysis of climate action communication on TikTok [paper], the use of hypergraphs to model opinion dynamics in large-scale social media [poster], and the role of interfaces in shaping human creativity during the interaction with generative AI tools [paper].

Michael Szell wins EU Horizon grant

As one of 32 partners, Michael Szell / ITU is part of the EU (Horizon) project

JUST STREETS – Mobility justice for all: framing safer, healthier and happier streets

that has just started! The consortium includes 12 European cities representing more than 4.5 million citizens. The project aims to transform cities’ car-centered mobility narratives that take for granted that streets are for motorized traffic only, to promote walking, cycling and other active modes of mobility.

To reach this goal, ITU’s part of the project will develop algorithmic methods to study low traffic neighborhoods and bicycle/pedestrian networks, and analyze mobility data with focus on safety, for better planning of human-centric, sustainable mobility.

This grant will provide us funding for a new PhD student, Clément Sebastiao, who has recently joined our group.

PhD Open Call 2024

The ITU-wide PhD Open Call 2024, deadline Feb 25th, is now open!  If your research overlaps with ours and you are interested, get in touch!

Either reach out directly to one of us, or use the student contact form on our students page, where you can also get inspiration for potential research projects. All professors at NERDS are open to PhD supervision and have good ideas for possible PhD projects, so don’t hesitate to reach out. One of our PhD students, Anastassia, has joined us previously through this call.

In Denmark, PhD students are employees, where both salary and working conditions are excellent. The NERDS group is a down-to-earth and fun place to be. Copenhagen is often named as the best city in the world to live in, and for good reasons. It’s world-renowned for food, beer, art, music, architecture, the Scandinavian “hygge”, and much more. In Denmark, parental leave is generous, and child-care is excellent and cheap.

Clément Sebastiao has joined NERDS

Happy new year! 🥳

We are thrilled to welcome Clément Sebastiao to our research group!

Clément joins us as PhD student for 3 years, funded by a EU project we cannot yet legally talk about (but soon), supported by his new supervisor Michael Szell. He completed his Master’s degree in 2023 from ENS Lyon in Complex Systems and Physics. He also has ample experience with internships, including at our friends at ISI Foundation and also at NERDS in 2022, where he started a project on bicycle network growth. He will continue in this vein, developing algorithmic methods to study bicycle/pedestrian networks, low traffic neighborhoods, and mobility data with focus on safety, for better planning of sustainable mobility. Given his interdisciplinary background and know-how in complex networks and systems, he is the ideal candidate for this task, ensuring a smooth takeover of the bicycle network / urban data science torch passed by our now last-year PhD students Ane and Anastassia.

Roberta wins ERC Consolidator grant!

Wow – Roberta Sinatra just won an ERC Consolidator grant! We congratulate her with all our hearts to this once-in-a-lifetime achievement!

An ERC Consolidator grant comes with 2 million EUR for 5 years and enables “a scientist who wants to consolidate their independence by establishing a research team and continuing to develop a success career in Europe”.

Roberta’s excellence, her interdisciplinarity, and her proposed topic just hit the right nerve:

scAIence: Quantifying AI-infused Science

The goal of scAIence is to quantify whether, how, and with which implications generative AI is changing how scientists write, communicate, and diffuse their science, and to explore rigorously the opportunities, dangers, and implications of scientists augmenting their scientific writing with AI. The focus of scAIence is quantitative and based on large-scale data and controlled experiments, since we lack a systematic analysis of AI-generated science: All our evidence regarding AI-generated writing is anecdotal or based on small case studies.

Within the scAIence project, Roberta and her team will deploy a novel computational social science approach, based on a wide array of quantitative disciplines, leveraging large-scale databases of human-generated information and controlled experiments. scAIence will break new ground by (i) introducing the quantitative methods required to understand AI-infused science, (ii) redefining metrics and models to account for AI-generated content in science, and (iii) delivering quantitative scientific insights into how AI is changing the diffusion of science. Taken together, scAIence will lay the scientific foundation for the quantitative study of AI-infused science.

The scAIence project is planned to take place at Roberta’s main affiliation SODAS at Copenhagen University – follow Roberta for upcoming hiring calls for PhD students and Postdocs.