In general, detection is the extraction of intelligence from a carrier signal in a communication system. Note that this may be either an overt signal, as in a conventional radio broadcast, or a covert signal, as in steganography.
In opto-electronic systems, the generation of an electrical signal in response to a received optical input. For example, the optical signal received from an optical fiber is converted to an electrical signal in a detector, often by a photodiode.
In radio systems, the extraction of an AM signal from its carrier frequency.
More on [ Detection ]

A Real-Life Instance of Plagiarism Detection by SCAM - An article about detecting plagiarism with detection software. Links to other stories.
Avoiding and Detecting Plagiarism - Tips for teachers and students on how to avoid and detect plagiarism. Emphasis on cut and paste plagiarism from the Internet.
Copy Detection Mechanisms - Article by 2 computer scientists, Narayanan Shivakumar and Hector Garcia-Molina,from Stanford University detailing how plagiarism databases work.
Copyscape - Website Plagiarism Search - Finds copies of content on the web to help find plagiarism and copyright infringement.
Houston Chronicle Editorial - Editorial on detecting and preventing student plagiarism by Gary Galles, economics professor from Pepperdine University.
Hyperstamps - Cyber copyright service.
Internet Plagiarism: Strategies to Deter Academic Misconduct - Article about plagiarism. Some good links.
MyDropBox.com - Provides technology services to detect and prevent cases of Internet plagiarism.
NPR : All Things Considered : Plagiarism - Realaudio-format radio report. Robert Siegel speaks with Louis Bloomfield, a professor of physics at the University of Virginia. Suspicious about student cheating, the professor designed a computer program that would identify student plagarism. The program identified 122 students whose work suggested cheating (Segment is 4 minutes in duration).
Meta Description: [ Robert Siegel speaks with Louis Bloomfield, a professor of physics at the University of Virginia. Suspicious about student cheating,the professor designed a computer program that would identify student plagarism. The program identified 122 students whose work suggested cheating. ]
Plagiarism Checker - Provides a free service to determine the originality of texts based on comparisons with Internet searches.
Meta Description: [ Check Plagiarism On the Internet for Free. Teachers: Find out if your students are cheating. Authors: Find out if people have copied your work. No file uploads required. Report plagiarism to Google or to a teacher. ]
Plagiarism Detection - Site to download YAP (Yet Another Plague), a plagiarism detection program. Can also download articles about YAP and plagiarism from ftp sites.
Plagiarism.org.uk - Business which investigates texts for plagiarism and copying by third parties. Studies academic, industrial and literary texts of all types.
Meta Description: [ The Forensic Linguistics Institute, the director of which is J Olsson, MA, MPhil, Member of the International Association of Forensic Linguistics, has spent many years studying forensic texts, from confessions to ransom demands to suicide letters, to cases of academic, literary and industrial pla... ]
Salon News Magazine - An article about the problems that may occur with plagiarism detection software.
Meta Description: [ The Web's plagiarism police: An online service claims it can identify purloined papers. So why'd it nail my thesis? ]
South Shore Educational Collaborative: Plagiarism - Information and links for teachers wanting to check for plagiarism. Note: links are to sites that offer papers for free or for sale.
Student Plagiarism in an Online World - Discusses tools for exposing cybercheating. Sponsored by the American Society for Engineering Education
Turn It In - Provides a service to determine the originality of texts based on comparisons with their internal database and net-wide searches. Five free trials.
Meta Description: [ The worldwide standard in online plagiarism prevention, Turnitin helps educators and students take full advantage of the internet's educational potential. ]
Urkund.com - A fully automated paid service designed to help a school deal with plagiarism. It requires no software installation; all that is needed is a web browser and an e-mail address.
Using the Web to fight Plagiarism - Martin Holmes provides tips on using AltaVista to locate resources from which a student may have plagiarized material.
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