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terça-feira, 2 de novembro de 2010

Priberam Machine Learning Lunch Seminars

Priberam Machine Learning Lunch Seminar
Speaker: Andras Hartmann (INESC-ID)
Venue: IST Alameda, Sala PA2 (Edifício de Pós-Graduação)
Date: Tuesday, November 2nd, 2010
Time: 13:00
Lunch will be provided

Title: "Mind The Gap: Reconstruction of missing cardiovascular signals using adaptive filtering"


In this talk I will introduce a robust method for filling in short missing segments in multiparameter Intensive Care Unit cardiovascular data. This work was inspired by the ``PhysioNet/Computing in Cardiology Challenge 2010: Mind the Gap''.
The interconnections between the signals were identified in the form of composite IIR transfer functions using the signals' history. A genetic algorithm was applied for inferring the filter coefficients. Assuming that the connections do not vary in time, we managed to reconstruct the missing signals using the yet available parallel measured signals and the transfer functions.
The results are promising, as this method achieved the 5th place among 53 participants of the challenge. We concluded that this approach can be efficient in reconstructing and even detecting missing or corrupted cardiovascular signals or other type of datasets with several modalities and strong interconnections between them.


Bio: András Hartmann received his MSc degree from Budapest University of Technology and Economics in Information Systems and Computational Engineering with specialization in software design in 2005. In 2008 he gained his MSc, this time in Biomedical Engineering in a joint program of Semmelweis Medical University and Budapest University of Technology and Economics. Since July 2009 he is a member of the INESC-ID KDBIO Group, working on the project DynaMo - Dynamical modeling, control and optimization of metabolic networks.
He is interested in modeling complex biological and physiological systems, in particular: identification and dynamic modeling of metabolic networks; spatial and temporal connectivity in human brain; and dynamic modeling of cardiovascular system.

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