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With the advent of new high data rate wireless applications, as well as growth of existing wireless services, demand for additional spectrum is rapidly increasing. Existing "command-and-control" spectrum allocations defined by government regulatory authorities, such as federal communications commission (FCC), prohibit unlicensed access to licensed spectrum, constraining them instead to several heavily populated, interference-prone frequency bands. Though several report shows that still the spectrum is not utilized efficiently across time and frequency. To use spectrum efficiently, a new...

This book examines the stability of bord and pillar workings affected by overlying and adjacent caved goaves in underground coal mines. Through detailed numerical analysis, it investigates stress redistribution, rock mass response, and pillar performance under complex mining conditions. The study offers valuable insights for mine planners and geotechnical engineers aimed at improving safety and design efficiency in multi-seam mining environments.