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Media Relations |
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Another difference that can be noted between right and left-wing think tanks concerns their media appearance and media relations. While in 1997 53 % of the U.S. media references made to think tanks involved conservative institutions, progressive think tanks accounted for only16 % of the media citations made to think tanks (32 % centrist institutions). This suggests that the media agenda is markedly influenced by conservative issues and ideology, and therefore leads to a considerable imbalance within the spectrum of political views.
On the other hand the financial resources of right- and left- wing media associated with think tanks also differ appreciably. While conservative foundations provided US$ 2,734,263 to four right-of-center magazines between 1990 and 1993 including The National Interest, The Public Interest, The New Criterion, and The American Spectator, over the same time period four left-of-center publications, namely The Nation, The Progressive, In These Times, and Mother Jones received only US$ 269,500 from foundations.
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Expert system
Expert systems are advanced computer programs that mimic the knowledge and reasoning capabilities of an expert in a particular discipline. Their creators strive to clone the expertise of one or several human specialists to develop a tool that can be used by the layman to solve difficult or ambiguous problems. Expert systems differ from conventional computer programs as they combine facts with rules that state relations between the facts to achieve a crude form of reasoning analogous to  artificial intelligence. The three main elements of expert systems are: (1) an interface which allows interaction between the system and the user, (2) a database (also called the knowledge base) which consists of axioms and rules, and (3) the inference engine, a computer program that executes the inference-making process. The disadvantage of rule-based expert systems is that they cannot handle unanticipated events, as every condition that may be encountered must be described by a rule. They also remain limited to narrow problem domains such as troubleshooting malfunctioning equipment or medical image interpretation, but still have the advantage of being much lower in costs compared with paying an expert or a team of specialists.
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