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A key challenge in a ubiquitous network society is the design of effective authentication and access control schemes that adequately meet the unique security issues posed by the context-aware service paradigm. Despite recent advances in Web services security approaches, issues remain that impede the development of context-aware authentication and access(More)
A focusing-free and multispectral three-dimensional endoscope based on a compact compound-eye camera called TOMBO (thin observation module by bound optics) is proposed. A prototype endoscopic TOMBO with 3×2 aspherical lenses using a wavefront coding technique and a 640×480-pixel color image sensor demonstrates extended depth of focus and depth(More)
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