Ημερίδα Παρασκευή 15/3/2013

Θέμα: Robust Sparse Embedding and Reconstruction via Dictionary Learning
Τόπος: Αίθουσα Α1 Τμήμα Πληροφορικής και Τηλεπικοινωνιών ΕΚΠΑ
Χρόνος : Παρασκευή 15/3/2013 (Ώρα 11.00 – 12.00)
Ομιλητής : Georgios B. Giannakis

Abstract: In this talk I will outline a novel approach for nonlinear data-adaptive compression and reconstruction of high or even infinite dimensional signals living on a smooth but otherwise unknown manifold. Compression is effected through affine embeddings to lower dimensional spaces. These embeddings are obtained via linear regression and bilinear dictionary learning algorithms that leverage manifold smoothness as well as sparsity of the affine model and its residuals. The emergent unifying framework is general enough to encompass known locally linear embedding and compressive sampling approaches to dimensionality reduction. Emphasis is placed on reconstructing high dimensional data from their low dimensional embeddings. Preliminary tests demonstrate the analytical claims, and their potential to (de)compressing synthetic and real data.

Short bio. G.B. Giannakis (IEEE Fellow’97) received his Diploma in Electrical Engr. from the Ntl. Tech. Univ. of Athens, Greece, 1981. From 1982 to 1986 he was with the Univ. of Southern California (USC), where he received his MSc. in Electrical Engineering, 1983, MSc. in  athematics, 1986, and Ph.D. in Electrical Engr., 1986. Since 1999 he has been a professor with the Univ. of Minnesota, where he now holds an ADC Chair in Wireless Telecommunications in the ECE Department, and serves as director of the Digital Technology Center. His general interests span the areas of communications, networking and statistical signal processing – subjects on which he has published more than 340 journal papers, 560 conference papers, 20 book chapters, two edited books and two research monographs (h-index 101). Current research focuses on compressive sensing, cognitive radios, cross-layer designs, wireless sensors, social and power grid networks. He is the (co-)inventor of 21 patents issued, and the (co-) recipient of 8 best paper awards from the IEEE Signal Processing (SP) and Communications Societies, including the G. Marconi Prize Paper Award in Wireless Communications. He also received Technical Achievement Awards from the SP Society (2000), from EURASIP (2005), a Young Faculty Teaching Award, and the G. W. Taylor Award for Distinguished Research from the University of Minnesota. He is a Fellow of EURASIP, and has served the IEEE.