18 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
7 papers
Emergence of network communities driven by local rules
Alexei Vazquez
Natural systems are modeled by networks with nodes and links. Often the nodes are segregated into communities with different connectivity patterns. Node heterogeneity such as polit…
Emerge of scaling in project schedules
Alexei Vazquez
A project schedule contains a network of activities, the activity durations, the early and late finish dates for each activity, and the associated total float or slack times, the d…
Manageable to unmanageable transition in a fractal model of project networks
Alexei Vazquez
Project networks are characterized by power law degree distributions, a property that is known to promote spreading. In contrast, the longest path length of project networks scales…
Activity delay patterns in project networks
Alexei Vazquez, Chrysostomos Marasinou, Georgios Kalogridis +1
Delays in activities completion drive human projects to schedule and cost overruns. It is believed activity delays are the consequence of multiple idiosyncrasies without specific p…
Complex hypergraphs
Alexei Vazquez
Providing an abstract representation of natural and human complex structures is a challenging problem. Accounting for the system heterogenous components while allowing for analytic…
Tropical approximation to finish time of activity networks
Alexei Vazquez
We breakdown complex projects into activities and their logical dependencies. We estimate the project finish time based on the activity durations and relations. However, adverse ev…
Uncovering the fragility of large-scale engineering project networks
Marc Santolini, Christos Ellinas, Christos Nicolaides
Engineering projects are notoriously hard to complete on-time, with project delays often theorised to propagate across interdependent activities. Here, we use a novel dataset consi…