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expert system

(Encyclopedia)expert system, a computer system or program that uses artificial intelligence techniques to solve problems that ordinarily require a knowledgeable human. The method used to construct such systems, kno...

Pedersen, Charles John

(Encyclopedia)Pedersen, Charles John, 1904–89, American chemist, b. Busan, Korea, M.S. Massachusetts Institute of Technology, 1927. After finishing his studies, Pedersen began work as a research chemist for the D...

Roanne

(Encyclopedia)Roanne rôänˈ [key], town (1990 pop. 42,848), Loire dept., E central France, on the Loire River. Cotton and metals are the chief products; other industries include tanning, machine and vehicle manuf...

Samcheok

(Encyclopedia)Samcheok or Samchok sämˈchôkˈ [key], city (1995 pop. 83,815), Gangwon (Kangwon) prov., E South Korea, a port on the Sea of Japan (or East Sea). It is a large industrial center in the heart of a ri...

Rambouillet

(Encyclopedia)Rambouillet, town (1990 pop. 25,293), Yvelines dept., N France. It is a summer resort in the heart of a magnificent forest. Sheep are raised, and radio equipment and plastics are made. The nearby châ...

angina pectoris

(Encyclopedia)angina pectoris ănjīˈnə pĕkˈtərĭs [key], condition characterized by chest pain that occurs when the muscles of the heart receive an insufficient supply of oxygen. This results when the arterie...

aneurysm

(Encyclopedia)aneurysm ănˈyo͝orĭzəm [key], localized dilatation of a blood vessel, particularly an artery, or the heart. Dilatation of an artery, and therefore weakness of that portion of the arterial wall, ma...

Llewellyn, Richard

(Encyclopedia)Llewellyn, Richard lo͞oĕlˈĭn [key], 1907–83, Welsh novelist. He is best known as the author of How Green Was My Valley (1939), a story of life in the S Wales mining areas, and None but the Lonel...

Jefferies, Richard

(Encyclopedia)Jefferies, Richard jĕfˈrēz [key], 1848–87, English author. A naturalist, he wrote several books about the English countryside. He first achieved recognition with the sketches The Gamekeeper at Ho...

Field, Rachel

(Encyclopedia)Field, Rachel, 1894–1942, American writer, b. New York City, educated at Radcliffe. Her books for children include The Cross-Stitch Heart and Other One-Act Plays (1927), Hitty: Her First Hundred Yea...