I am a third year PhD student at the University of Pennsylvania, Department of Electrical and Systems Engineering, where I am working with Ali Jadbabaie, George Pappas and Rakesh Vohra.  Here is a link to my Google Scholar profile.

  • Research Interests

My research interests lie on the analysis of networked dynamical systems.  Descriptive keywords: Actuator/Sensor Placement in large-scale Networked Systems; Social Networks, Information Diffusion, Product Adoption and Advertising Strategies; Neural Networks.

Tools that I use come from automatic control; game theory; optimization and probability theory; linear algebra.

  • Publications
  1. V. Tzoumas, M. A. Rahimian, G. J. Pappas and A. Jadbabaie. Minimal Actuator Placement with Optimal Control Constraints. Submitted to IEEE American Control Conference (ACC), September 2014.

    Typo
    in the proof of Proposition 2 (see the first paragraph after equation (20)): It should be “rho(Gamma_D^{1/2} L_1(z)^{-1}) = rho(Gamma_D^{1/2} L_2(z)^{-1}) = rho(Gamma_D^{1/2}), and, as a result, R(Gamma_D^{1/2} L_1(z)^{-1}) = R(Gamma_D^{1/2} L_2(z)^{-1})= R(Gamma_D^{1/2}) [21].”
    .
  2. V. Tzoumas, M. A. Rahimian, G. J. Pappas and A. Jadbabaie. Minimal Actuator Placement with Bounds on Control Effort. Submitted for journal publication.
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  3. V. Tzoumas, C. Amanatidis, and E. Markakis. A Game-Theoretic Analysis of a Competitive Diffusion Process over Social Networks, 8th Conference on Web and Internet Economics (WINE), December 2012.

    We consider a non-cooperative simultaneous game among firms that promote their product over a network by choosing appropriate seeds.  We focus on various questions regarding the pure strategy Nash equilibria of these games, including their efficiency. Check our full version for all missing proofs and extra results.
  • Other Academic Experience
  • Teaching
  1. Teaching Assistant for the graduate course Linear Optimization (ESE504) offered by Ali Jadbabaie (Fall 2013).
  2. Teaching Assistant for the graduate course Linear Systems (ESE500) offered by Michael Carchidi (Fall 2014).
  • Reviews
  1. 11th ACM Conference on Electronic Commerce (EC), 2010.
  2. 21st International Word Wide Web Conference (WWW), 2012.
  3. 8th Workshop on Internet & Network Economics (WINE), 2012.
  4. American Control Conference (ACC), 2014; GlobalSIP, 2014; TNSE, 2014.
  • Education
  • University of Pennsylvania, Philadelphia, USA

Ph.D. Candidate, September 2012-present, Department of Electrical and Systems Engineering.
Advisors: Ali Jadbabaie, George Pappas.

  • National Technical University of Athens, Athens, Greece

Diploma (5-year B.Sc. degree with thesis) in Electrical and Computer Engineering, 2005-2012.
Thesis: A Game-Theoretic Analysis of a Competitive Diffusion Process over Social Networks.
Advisors: Evangelos Markakis, Trifon Koussiouris.
GPA: 9.54/10 (top 1.5%)

  • Other Activities

I am a runner.  I also enjoy mountaineering and practicing Kendo.