Research

My research interests are in machine learning, optimization and distributed sensor management. I am particularly interested in the topics of belief propagation, active learning, approximate inference and matroid theory.

My work for my Master thesis was in Computational Biology. I developed a mixture model method for the discovery of binding events in ChIP-Seq data and their proper alignment in multiple conditions under a probabilistic framework.

Publications

G. Papachristoudis and J. W. Fisher III. Adaptive Belief Propagation. In Proceedings of the 32nd International Conference on Machine Learning (ICML), Lille, France, July 2015. [BibTeX]  [poster]  [presentation]  [talk]  [code]

G. Papachristoudis and J. W. Fisher III. Efficient Information Planning in Gaussian MRFs. In Proceedings of the 18th International Conference on Information Fusion (FUSION), Washington, D.C., July 2015. [BibTeX]

G. Papachristoudis and J. W. Fisher III. On the Complextiy of Information Planning in Gaussian Models. In Proceedings of the 40th IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Brisbane, Australia, Apr 2015. [BibTeX]  [poster]

G. Papachristoudis and J. W. Fisher III. Theoretical Guarantees on Penalized Information Gathering. In Proceedings of the IEEE Statistical Signal Processing Workshop, Ann Arbor, MI, Aug 2012. [BibTeX]  [poster]

Y. Guo, G. Papachristoudis, R. Altshuler et al. Discovering homotypic binding events at high spatial resolution. Bioinformatics 26(24), 2010, p. 3028–3034. [BibTeX]

G. Papachristoudis, S. Diplaris, P. A. Mitkas. SoFoCles: Feature filtering for microarray classification based on Gene Ontology. Journal of Biomedical Informatics. 43(1), Feb 2010, 1–14. [BibTeX]

M. G. Roubelakis, P. Zotos, G. Papachristoudis et al. Human microRNA target analysis and gene ontology clustering by GOmir, a novel stand-alone application. BMC Bioinformatics 10(S-6), 2009. [BibTeX]

P. Zotos, G. Papachristoudis, M. G. Roubelakis et al. GOmir: A stand-alone application for human microRNA target analysis and gene ontology clustering. BIBE 2008, 1–6. [BibTeX]

Theses

Theoretical Guarantees and Complexity Reduction in Information Planning. PhD thesis, MIT, June 2015.

Spatial and Temporal Coupling Models for the Discovery of Binding Events in ChIP-Seq Data. Master thesis, MIT, Feb 2010.

SoFoCles: Feature filtering for microarray classification based on Gene Ontology (in Greek). Diploma thesis, AUTH, Greece, July 2007.

Reviewing

I have served as a reviewer in IEEE Statistical Signal Processing Workshop 2012 (SSP '12) and IEEE Transactions on Signal Processing (TSP).

(My Erdös number is 3)