A constraint is a restriction on a space of possibilities; it is a piece of knowledge that narrows the scope of this space. Because constraints arise naturally in most areas of human endeavor, they are the most general means for formulating regularities that govern our computational, physical, biological, and social worlds. Some...

Digital transmissions are rapidly supplanting analog transmissions in both amateur and commercial radio communications. Digital radio transmissions offer many inherent advantages. Digital techniques allow virtually noise-free transmission of data, messages, control commands, sounds and images to be achieved. Digital transmissions allow...

Collaborative Computer Security and Trust Management combines perspectives of leading researchers in collaborative security to discuss recent advances in this burgeoning new field. Practitioners, researchers, and academicians are presented with lessons learned by international experts to meet the new challenges of security in the...