10 citations · 22 across the 16 of their papers we have counts for
18 papers
Incremental Risk Assessment for Cascading Failures in Large-Scale Multi-Agent Systems
Guangyi Liu, Vivek Pandey, Christoforos Somarakis +1
We develop a framework for studying and quantifying the risk of cascading failures in time-delay consensus networks, motivated by a team of agents attempting temporal rendezvous un…
Delay-Induced Watermarking for Detection of Replay Attacks in Linear Systems
Christoforos Somarakis, Raman Goyal, Erfaun Noorani +1
A state-feedback watermarking signal design for the detection of replay attacks in linear systems is proposed. The control input is augmented with a random time-delayed term of the…
Risk of Cascading Collisions in Network of Vehicles with Delayed Communication
Guangyi Liu, Christoforos Somarakis, Nader Motee
This paper establishes and explores a framework to analyze the risk of cascading failures in a platoon of autonomous vehicles, accounting for communication time-delays and input un…
A finite element method to compute the damping rate and frequency of oscillating fluids inside microfluidic nozzles
Søren Taverniers, Svyatoslav Korneev, Christoforos Somarakis +2
The computation of damping rates of an oscillating fluid with a free surface in which viscosity is small and surface tension high is numerically challenging. A typical application…
Cascading Waves of Fluctuation in Time-delay Multi-agent Rendezvous
Guangyi Liu, Vivek Pandey, Christoforos Somarakis +1
We develop a framework to assess the risk of cascading failures when a team of agents aims to rendezvous in time in the presence of exogenous noise and communication time-delay. Th…
Co-Design of Watermarking and Robust Control for Security in Cyber-Physical Systems
Raman Goyal, Christoforos Somarakis, Erfaun Noorani +1
This work discusses a novel framework for simultaneous synthesis of optimal watermarking signal and robust controllers in cyber-physical systems to minimize the loss in performance…
Physics-Based Nozzle Design Rules for High-Frequency Liquid Metal Jetting
Jongmin Seo, Christoforos Somarakis, Svyatoslav Korneev +2
We present physics-based nozzle design rules to achieve high-throughput and stable jetting in drop-on-demand liquid metal 3D printing. The design rules are based on scaling laws th…
Risk of Phase Incoherence in Wide Area Control of Synchronous Power Networks
Christoforos Somarakis, Guangyi Liu, Nader Motee
We develop a framework to quantify systemic risk measures in a class of Wide-Area-Control (WAC) laws in power networks in the presence of noisy and time-delayed sensory data. A clo…
Emergence of Cascading Risk and Role of Spatial Locations of Collisions in Time-Delayed Platoon of Vehicles
Guangyi Liu, Christoforos Somarakis, Nader Motee
We develop a framework to assess the risk of cascading collisions in a platoon of vehicles in the presence of exogenous noise and communication time-delay. The notion of Value-at-R…
Risk of Cascading Failures in Time-Delayed Vehicle Platooning
Guangyi Liu, Christoforos Somarakis, Nader Motee
We develop a systemic risk framework to explore cascading systemic failures in networked control systems. A time-delayed version of the vehicle platooning problem is used as a benc…
Interpretable machine learning models: a physics-based view
Ion Matei, Johan de Kleer, Christoforos Somarakis +2
To understand changes in physical systems and facilitate decisions, explaining how model predictions are made is crucial. We use model-based interpretability, where models of physi…
Centrality in Time-Delay Consensus Networks with Structured Uncertainties
Yaser Ghaedsharaf, Milad Siami, Christoforos Somarakis +1
We investigate notions of network centrality in terms of the underlying coupling graph of the network, structure of exogenous uncertainties, and communication time-delay. Our focus…
Risk of Collision and Detachment in Vehicle Platooning: Time-Delay-Induced Limitations and Trade-Offs (Extended Version)
Christoforos Somarakis, Yaser Ghaedsharaf, Nader Motee
We quantify the value-at-risk of inter-vehicle collision and detachment for a class of platoons, which are governed by second-order dynamics in presence of communication time-delay…
Performance Improvement in Noisy Linear Consensus Networks with Time-Delay
Yaser Ghaedsharaf, Milad Siami, Christoforos Somarakis +1
We analyze performance of a class of time-delay first-order consensus networks from a graph topological perspective and present methods to improve it. The performance is measured b…
Aggregate Fluctuations in Networks with Drift-Diffusion Models Driven by Stable Non-Gaussian Disturbances
Christoforos Somarakis, Nader Motee
The focus of this paper is to quantify measures of aggregate fluctuations for a class of consensus-seeking multiagent networks subject to exogenous noise with alpha-stable distribu…
Koopman Performance Analysis of Nonlinear Consensus Networks
Hossein K. Mousavi, Christoforos Somarakis, Qiyu Sun +1
Spectral decomposition of dynamical systems is a popular methodology to investigate the fundamental qualitative and quantitative properties of these systems and their solutions. In…
Time-Delay Origins of Fundamental Tradeoffs Between Risk of Large Fluctuations and Network Connectivity
Christoforos Somarakis, Yaser Ghaedsharaf, Nader Motee
For the class of noisy time-delay linear consensus networks, we obtain explicit formulas for risk of large fluctuations of a scalar observable as a function of Laplacian spectrum a…
Convergence Analysis of Classes of Asymmetric Networks of Cucker-Smale Type with Deterministic Perturbations
Christoforos Somarakis, Evripidis Paraskevas, John S. Baras +1
We introduce and discuss two nonlinear perturbed extensions of the Cucker-Smale model with asymmetric coupling weights. The first model assumes a finite collection of autonomous ag…