George Balatsouras Title: Recovering Structural Information for Better Static Analysis. Advisor: Yannis Smaragdakis, Professor Aggelos Biboudis Title: Extensible and Efficient Streaming Libraries. Advisor: Yannis Smaragdakis, Professor Michail Bourmpos Title: Coupled semiconductor lasers and their applications in telecommunications and networks. Advisor: Dimitris Syvridis, Professor Εlias Konstantinidis Title: A GPU performance estimation model based on micro-benchmarks and black-box kernel profiling. Advisor: Yiannis Cotronis, Associate Professor Spiridoula Xenaki Title: Advances in Possibilistic Clustering with Application to Hyperspectral Image Processing. Advisor: Sergios Theodoridis, Professor