38 citations · 52 across the 11 of their papers we have counts for
12 papers
Computing Absorbing-Frequency Centrality: Complexity, Estimators, and Scalable Algorithms for Stochastic Networks
Wencheng Bao, Eleftheria Kontou, Chrysafis Vogiatzis
In a stochastic network, where edges fail and weights may vary across realizations, the node of highest betweenness is itself random. Absorbing-frequency centrality (AFC) scores ea…
Risk-Averse Stochastic User Equilibrium on Uncertain Transportation Networks
Wencheng Bao, Chrysafis Vogiatzis, Eleftheria Kontou
Travel times in transportation networks are uncertain and exhibit right-skewed distributions with long tails under weather and incident disruptions. The current challenge is that e…
A Survey on Optimization Studies of Group Centrality Metrics
Mustafa Can Camur, Chrysafis Vogiatzis
Centrality metrics have become a popular concept in network science and optimization. Over the years, centrality has been used to assign importance and identify influential element…
A Robust Optimization Framework for Two-Echelon Vehicle and UAV Routing for Post-Disaster Humanitarian Logistics Operations
Tasnim Ibn Faiz, Chrysafis Vogiatzis, Md. Noor-E-Alam
Providing first aid and other supplies (e.g., epi-pens, medical supplies, dry food, water) during and after a disaster is always challenging. The complexity of these operations inc…
Solving reward-collecting problems with UAVs: a comparison of online optimization and Q-learning
Yixuan Liu, Chrysafis Vogiatzis, Ruriko Yoshida +1
Uncrewed autonomous vehicles (UAVs) have made significant contributions to reconnaissance and surveillance missions in past US military campaigns. As the prevalence of UAVs increas…
SARS-CoV-2 Dissemination using a Network of the United States Counties
Patrick Urrutia, David Wren, Chrysafis Vogiatzis +1
During 2020 and 2021, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission has been increasing amongst the world's population at an alarming rate. Reducing the…
Evacuation Route Planning for Alternative Fuel Vehicles
Denissa Sari Darmawi Purba, Eleftheria Kontou, Chrysafis Vogiatzis
As the number of adopted alternative fuel vehicles increases, it is crucial for communities (especially those that are susceptible to hazards) to make evacuation plans that account…
Computational Approaches for Solving Two-Echelon Vehicle and UAV Routing Problems for Post-Disaster Humanitarian Operations
Tasnim Ibn Faiz, Chrysafis Vogiatzis, Md. Noor-E-Alam
Humanitarian logistics service providers have two major responsibilities immediately after a disaster: locating trapped people and routing aid to them. These difficult operations a…
A Column Generation Algorithm for Vehicle Scheduling and Routing Problems
Tasnim Ibn Faiz, Chrysafis Vogiatzis, Md. Noor-E-Alam
During natural or anthropogenic disasters, humanitarian organizations face a series of time-sensitive tasks. One of the tasks involves picking up critical resources (e.g., first ai…
A Primal-Dual Interior Point Method for a Novel Type-2 Second Order Cone Optimization Problem
Md Sarowar Morshed, Chrysafis Vogiatzis, Md. Noor-E-Alam
In this paper, we define a new, special second order cone as a type- second order cone. We focus on the case of , which can be viewed as SOCO with an additional {\em compli…
Identification of Essential Proteins Using Induced Stars in Protein-Protein Interaction Networks
Chrysafis Vogiatzis, Mustafa Can Camur
In this work, we propose a novel centrality metric, referred to as star centrality, which incorporates information from the closed neighborhood of a node, rather than solely from t…
Multi Loci Phylogenetic Analysis with Gene Tree Clustering
Ruriko Yoshida, Kenji Fukumizu, Chrysafis Vogiatzis
Summary: Both theory and empirical evidence indicate that phylogenies (trees) of different genes (loci) do not display precisely matched topologies. This phylogenetic incongruence…