Parallel Substitution Algorithm (PSA) is a new model for distributed (cellular) computations. It provides a concise mapping of distributed computation processes into cellular arrays. A PSA is specified by a set of parallel substitutions operating over a cellular array.Two concepts make PSA a powerful tool for modelling cellular computations: 1) naming functions which allow the specification of any type of interactions in the computation space, 2) a context which serves to represent control of a computational process in time.The foundation of PSA theory comprises validity conditions of computations in the synchronous and asynchronous modes, space-time, space-space (2D ? 3D) and global-local equivalent transformations of PSAs, composition and decomposition of PSAs and interpretation of PSAs with automata nets.On the basis of the PSA theory, a variety of tools and techniques is developed for designing algorithmic-oriented cellular VLSI and optical architectures.

A contemporary time travel romance unlike anything else you've ever read. The Parallel Series continues: Quinn thought she'd simply dreamed Nick Reilly up. But now, weeks before her wedding, he's appeared in real life. Her doctor. And the longer he's here, trying to save her life, the more she's remembering about lives they shared in the past. Lives someone didn't want them to have. As Nick and Quinn piece together the truth about the life they once shared, they discover it was much deeper and darker than they ever imagined. That Quinn's life seems to restart again and again, a chain of events that always begins with Nick and Quinn falling in love, and ends with a mysterious blonde woman swooping into keep them apart. In order to keep history from repeating, Quinn will need to master her unusual gifts-but that means admitting to herself and to Nick why she stopped using them in the first place. He may never forgive her when he learns the truth, but Quinn is running out of options-because the clock is ticking, and it's no longer just her life that hangs in the balance. This book should be read following Parallel, but before Across Time and Across Eternity.