The series Abstracts of Dissertations of the Institute of Information and Communication Technologies at the Bulgarian Academy of Sciences presents in an electronic format the abstracts of Doctor of Sciences and PhD dissertations defended in the Institute of Information and Communication Technologies at the Bulgarian Academy of Sciences. The studies provide new original results in such areas of Information and Communication Technologies as Computer Networks and Architectures, Parallel Algorithms, Scientific Computations, Linguistic Modelling, Mathematical Methods for Sensor Data Processing, Information Technologies for Security, Technologies for Knowledge management and processing, Grid Technologies and Applications, Optimization and Decision Making, Signal Processing and Pattern Recognition, Information Processing and Systems, Intelligent Systems, Embedded Intelligent Technologies, Hierarchical Systems, Communication Systems and Services, etc.