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(artificial intelligence)
A large knowledge-based system.

Cyc is a very large, multi-contextual knowledge base and inference engine, the development of which started at the Microelectronics and Computer Technology Corporation (MCC) in Austin, Texas during the early 1980s.

Over the past eleven years the members of the Cyc team, lead by Doug Lenat, have added to the knowledge base a huge amount of fundamental human knowledge: facts, rules of thumb, and heuristics for reasoning about the objects and events of modern everyday life.

Cyc is an attempt to do symbolic AI on a massive scale. It is not based on numerical methods such as statistical probabilities, nor is it based on neural networks or fuzzy logic. All of the knowledge in Cyc is represented declaratively in the form of logical assertions. Cyc presently contains approximately 400,000 significant assertions, which include simple statements of fact, rules about what conclusions to draw if certain statements of fact are satisfied, and rules about how to reason with certain types of facts and rules. The inference engine derives new conclusions using deductive reasoning.

To date, Cyc has made possible ground-breaking pilot applications in the areas of heterogeneous database browsing and integration, captioned image retrieval, and natural language processing.

In January of 1995, a new independent company named Cycorp was created to continue the Cyc project. Cycorp is still in Austin, Texas. The president of Cycorp is Doug Lenat.

The development of Cyc has been supported by several organisations, including Apple, Bellcore, DEC, DoD, Interval, Kodak, and Microsoft.

Unofficial FAQ.
References in periodicals archive ?
CYC, for example, defines Process as a subclass of Event and Stuff, which are both subclasses of IndividualObject.
In anticipation of the event, the CYC committee faced a major obstacle: funding.
m]) if and only if there exists p [member of] Cyc ([sigma]) satisfying i [member of] Dom(p) and l(p)|m.
About Chicago Youth Centers: CYC supports the development of successful children and teens in Chicago's underserved communities by surrounding them with the tools and resources needed to persist and achieve success in school, life, and ultimately the workforce: innovative and creative spaces to learn, engaged families and mentors, and programs designed to expand children's abilities to think critically, create, communicate and collaborate.
In refractory cases, AZA, cyclosporin, intravenous immunoglobulins (IVIGs), MMF, danazol, CYC or splenectomy may be considered.
2 billion young people in the Commonwealth, and would provide a framework for youth-led development initiatives, the Government of Sri Lanka has offered to host the Secretariat of CYC.
CYC Vice Commodore Peter Luke made the address-in-reply, broadcast on the same hook-up from Sydney, where the presentation took place at the Wentworth Ballroom.
In April 2013 CYC announced about the development of a proprietary patented technology - Ultralute, which lengthens the useful life of the world's most common nuclear medicine radioisotope by up to 50%.
Mr Headey played with Mr Noble in the Birkby CYC under 18s who played in the Red Triangle League.
The caloric values and nutrient compositions of the CYC and PL supplements are listed in Table 3.