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61 expert system
Gen Mgta computer program that emulates the reasoning and decision making of a human expert in a particular field. The main components of an expert system are the knowledge base, which consists of facts and rules about appropriate courses of action based on the knowledge and experience of human experts; the inference engine, which simulates the inductive reasoning of a human expert; and the user interface, which enables users to interact with the system. Expert systems may be used by nonexperts to solve well-defined problems when human expertise is unavailable or expensive, or by experts seeking to find solutions to complex questions. They are used for a wide variety of tasks including medical diagnostics and financial decision making, and are an application of artificial intelligence. -
62 Wedgwood, Josiah
SUBJECT AREA: Domestic appliances and interiors[br]baptized 12 July 1730 Burslem, Staffordshire, Englandd. 3 January 1795 Etruria Hall, Staffordshire, England[br]English potter and man of science.[br]Wedgwood came from prolific farming stock who, in the seventeenth century, had turned to pot-making. At the age of 9 his education was brought to an end by his father's death and he was set to work in one of the family potteries. Two years later an attack of smallpox left him with a weakness in his right knee which prevented him from working the potter's wheel. This forced his attention to other aspects of the process, such as design and modelling. He was apprenticed to his brother Thomas in 1744, and in 1752 was in partnership with Thomas Whieldon, a leading Staffordshire potter, until probably the first half of 1759, when he became a master potter and set up in business on his own account at Ivy House Works in Burslem.Wedgwood was then able to exercise to the full his determination to improve the quality of his ware. This he achieved by careful attention to all aspects of the work: artistic judgement of form and decoration; chemical study of the materials; and intelligent management of manufacturing processes. For example, to achieve greater control over firing conditions, he invented a pyrometer, a temperature-measuring device by which the shrinkage of prepared clay cylinders in the furnace gave an indication of the temperature. Wedgwood was the first potter to employ steam power, installing a Boulton \& Watt engine for crushing and other operations in 1782. Beyond the confines of his works, Wedgwood concerned himself in local issues such as improvements to the road and canal systems to facilitate transport of raw materials and products.During the first ten years, Wedgwood steadily improved the quality of his cream ware, known as "Queen's ware" after a set of ware was presented to Queen Charlotte in 1762. The business prospered and his reputation grew. In 1766 he was able to purchase an estate on which he built new works, a mansion and a village to which he gave the name Etruria. Four years after the Etruria works were opened in 1769, Wedgwood began experimenting with a barium compound combined in a fine-textured base allied to a true porcelain. The result was Wedgwood's most original and distinctive ware similar to jasper, made in a wide variety of forms.Wedgwood had many followers and imitators but the merit of initiating and carrying through a large-scale technical and artistic development of English pottery belongs to Wedgwood.[br]Principal Honours and DistinctionsFRS 1783.BibliographyWedgwood contributed five papers to the Philosophical Transactions of the Royal Society, two in 1783 and 1790 on chemical subjects and three in 1782, 1784 and 1786 on his pyrometer.Further ReadingMeteyard, 1865, Life of Josiah Wedgwood, London (biography).A.Burton, 1976, Josiah Wedgwood: Biography, London: André Deutsch (a very readable account).LRD
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