The Leiden Complex Networks Network (LCN2) aims at bringing together scientists from different disciplines, based on a common interest in both theoretical models and empirical analyses of networks and graphs.

For many system in statistical physics the microcanonical and canonical ensemble are equivalent in the thermodynamic limit, but not for all.

This thesis seeks to combine two different research topics; Multi-Objective Optimization and Complex Network Analysis.

This project develops methods for ensuring the anonymity of individuals in social network data.

In this thesis, we extend the concept of null models as canonical ensembles of multi-graphs with given constraints and present new metrics able to characterize real-world layered systems based on their correlation patterns.

‘It has never been so easy to set up a Studium Generale series.’ With these words Tilman Grünewald thanked speaker Frank den Hollander, who kicked off the Studium Generale series on complex networks on Monday 20 February.

This dissertation consists of two parts, with the common theme

On Friday 23 September 2016 the Leiden Complex Networks Network day, the LCN2 day, will take place in Leiden.

The first successful Leiden Networks day took place on September 23, 2016. Six world-renowned speakers (see photo) in the field of complexity and network science provided their view on the field.

NETWORKS, a new consortium of 11 researchers from the University of Amsterdam, Technical University Eindhoven, Leiden University and CWI aims to address the pressing challenges posed by large-scale networks using stochastics and algorithms.

Professor Frank den Hollander has been awarded a 10-year grant through the NWO Gravitation program, jointly with colleagues from the University of Amsterdam, the Center for Mathematics and Computer Science in Amsterdam, and the Technical University of Eindhoven.

Scientists often need to make sense of complex systems without knowing the important parameters or even without access to all the information. A collaboration of network theorists, including Diego Garlaschelli (IMT Lucca/Leiden), has now published a review article in the inaugural issue of Nature Reviews…

The Leiden Computational Network Science Lab (CNS Lab) researches methods for knowledge discovery from real-world network data.

The authors of the article expect automation to improve accuracy in less complex programmes but worsens with increased complexity

Frank den Hollander has received the Humboldt Research Award of €60,000. He was nominated by two German colleagues with whom he is working together for an extensive period of time. ‘The award was a complete surprise to me.'

How do we address the pressing challenges posed by large-scale networks?

We study the structure, dynamics and physics of complex networks emerging from the intricate interconnectedness of the constituents of large systems.

This dissertation studies how domestic regulatory agencies and the officials representing them are influenced by and deal with the increasingly complex transnational environments in which they have come to operate. Based on (social) network analysis it demonstrates how decisions of domestic agencies…

The recent terrorist attacks in Europe are presumably not just acts committed by individuals, but acts facilitated by larger jihadist networks. But how do such networks operate? Understanding their modus operandi can be useful knowledge to counter terrorist threats.

In this thesis, we show that we can use Shimura’s CM theory to explicitly compute the Hilbert class field of any primitive quartic CM field.

The Leiden Leadership Centre is an international and interdisciplinary network organisation connecting people and perspectives.

A research data infrastructure in computational social science

The goal of the project is the development of stream mining techniques for complex patterns such as graphs. We will try to extend the existing state-of-the-art techniques into two, orthogonal directions: on the one hand, the mining of more complex patterns in streams, such as sequential patterns and…

Modelling supra-regional communities in the early 3rd Millennium BC

Protein–protein complexes are formed via transient states called encounter complexes that greatly influence the formation of the stereospecific complex.

Below you can find lists of Leiden-based and international organizations working on Central Asia, and an overview of useful resources on Central Asia.

Science, Leiden Institute of Advanced Computer Science (LIACS)

The ‘Food citizens?’ project is assisted by an advisory board, consisting of academics and stakeholders.

What invertebrates are available to feed nestlings in an agricultural landscape of varied complexity?

LeiCenSAA is dedicated to the study of Ancient Arabia and the sharing of knowledge and expertise on this topic. Thefore it aims to collaborate closely with other research in the field.

The Leiden University Sustainability Network is the platform for Leiden University staff and students to combine their efforts and support each other in making our university more sustainable.

The LGBT+ Network offers a platform for all lesbian, gay, bisexual, transgender and queer staff and students at Leiden University.

Promotor: Peter Stevenhagen

The focus of this programme is the inter-community social relationships and transformations of island networks in the Lesser Antilles across the historical divide.

We are currently experiencing problems connecting to our network. We are currently working to resolve the problem as soon as possible.

Both within Leiden University and in the external partner universities PhD research is conducted which is directly or indirectly related to regional integration.

This thesis is comprised of three chapters covering the theme of studying semistable varieties by looking at their dual combinatorial objects.

Promotor: E. Bouwman, Co-promotor: S. Bonnet

Essays in Archaeology and Assyriology Dedicated to Diederik J.W. Meijer in Honour of his 65th Birthday

Below you can find an overview of our network.

We aim to unravel the complex and intertwining regulatory systems that control development and antibiotic production in streptomycetes.

We study the physics of a broad range of biological and soft materials

How and under what conditions Dutch primary school principals' managerial networking activities affect the performance of their school

In photoactivated chemotherapy (PACT), a biologically active compound is caged by a light-cleavable protecting group.

The research groups within the biological, soft and complex systems research area study the physics of a broad range of biological and soft materials. This spans both experimental and theoretical research.