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This special issue introduces the reader to the theory, algorithms, and applications of principal component analysis and its many extensions.

This two-part special issue covers relevant aspects of network localization and navigation: theoretical foundations, localization technologies, positioning algorithms, and network operation.

This two-part special issue covers relevant aspects of network localization and navigation: theoretical foundations, localization technologies, positioning algorithms, and network operation.

This special issue presents recent results and advances in graph-theoretical methods across a broad spectrum of areas where their use has proven fruitful.

This special issue brings together recent international research on one of the most challenging and multi- disciplinary subjects of present and future engineering, architectural, medical, economic, information, and social sciences: the smart city paradigm.

This special issue presents the state of the art in small satellites, including their development, the advanced technologies that support them, and their applications in remote sensing, Earth observation, technology demonstration, and science missions.

This regular paper issue provides a tutorial on a novel multitarget tracking technique and reviews the use of emerging nonvolatile memory devices for neuro-inspired computing, and 2-D magnetic recording—a promising data storage technology.

This special issue focuses on the key concepts and trends in the safety and security of cyber–physical systems.