-
1 Heuristics
[A]t one point AM [Automatic Mathematician] had some notions of sets, set-operations, numbers, and simple arithmetic. One heuristic rule it knew said " If F is an interesting relation, then look at its inverse". This rule fired after AM had studied "multiplication" for a while. The r.h.s. of the rule then directed AM to define and study the relation "divisors-of" (e.g. divisors-of (12) {1,2,3,4,6,12}. Another heuristic rule that later fired said " If f is a relation from A into B, then it's worth examining those members of A which map into extremal members of B." In this case, f was matched to "divisors-of", A was "numbers", B was "sets of numbers", and an extremal member of B might be, e.g., a very small set of numbers. Thus this heuristic rule caused AM to define the set of numbers with no divisors, the set of numbers with only 1 divisor, with only 2 divisors, etc. One of these sets (the last [ sic] mentioned) turned out subsequently to be quite important; these numbers are of course the primes. (Lenat & Harris, 1978, p. 30)Extraordinarily rapid progress during the early stages of an attack on a new problem area is a rather common occurrence in AI research; it merely signifies that the test cases with which the system has been challenged are below the level of difficulty where combinatorial explosion of the number of pathways in the problem space sets in.... It is the goal of AI research to move that threshold higher and higher on the scale of problem complexity through the introduction of heuristics-heuristics to reduce the rate of growth of the solution tree, heuristics to guide the development of the tree so that it will be rich in pathways leading to satisfactory problem solutions, and heuristics to direct the search to the "best" of these pathways. (Gelernter, quoted in Barr & Feigenbaum, 1982, pp. 139-140)Historical dictionary of quotations in cognitive science > Heuristics
-
2 Flügge-Lotz, Irmgard
SUBJECT AREA: Aerospace[br]b. 1903 Germanyd. 1974 USA[br]German/American aeronautical engineer, specializing inflight control.[br]Both her father, a mathematician, and her mother encouraged Flügge-Lotz in her desire, unusual for a woman at that time, for a technical education. Her interest in aeronautics was awakened when she was a child, by seeing zeppelins (see Zeppelin, Ferdinand, Count von) being tested. In 1923 she entered the Technische Hochschule in Hannover to study engineering, specializing in aeronautics; she was often the only woman in the class. She obtained her doctorate in 1929 and began working in aeronautics. Two years later she derived the Lotz Method for calculating the distribution in aircraft wings of different shapes, which became widely used. Later, Flügge-Lotz took up an interest in automatic flight control of aircraft, notably of the discontinuous or "on-off" type. These were simple in design, inexpensive to manufacture and reliable in operation. By 1928 she had risen to the position of head of the Department of Theoretical Aerodynamics at Göttingen University, but she and her husband, Wilhelm Flügge, an engineering academic known for his anti-Nazi views, felt themselves increasingly discriminated against by the Hitler regime. In 1948 they emigrated to the USA, where Flügge was soon offered a professorship in engineering, while his wife had at first to make do with a lectureship. But her distinguished work eventually earned her appointment as the first woman full professor in the Engineering Department at Stanford University.She later extended her work on automatic flight control to the guidance of rockets and missiles, earning herself the description "a female Werner von Braun ".[br]Principal Honours and DistinctionsSociety of Women Engineers Achievement Award 1970. Fellow, Institution of Aeronautics and Astronautics.BibliographyFlügge-Lotz was the author of two books on automatic control and over fifty scientific papers.Further ReadingA.Stanley, 1993, Mothers and Daughters of Invention, Meruchen, NJ: Scarecrow Press, pp. 899–901.LRD
См. также в других словарях:
computer — computerlike, adj. /keuhm pyooh teuhr/, n. 1. Also called processor. an electronic device designed to accept data, perform prescribed mathematical and logical operations at high speed, and display the results of these operations. Cf. analog… … Universalium
Timeline of computing hardware 2400 BC–1949 — History of computing Hardware before 1960 Hardware 1960s to present Hardware in Soviet Bloc countries Artificial intelligence Computer science Operating systems Programming languages … Wikipedia
List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have … Wikipedia
Enlightenment I (The French): science, materialism and determinism — The French Enlightenment I: science, materialism and determinism Peter Jimack The French Enlightenment is not just a convenient label devised by historians of philosophy, and the thinkers to be discussed in this chapter and the next were for the… … History of philosophy
Alan Turing — Turing redirects here. For other uses, see Turing (disambiguation). Alan Turing Turing at the time of his election to Fellowship of the Royal Society … Wikipedia
History of computing hardware — Computing hardware is a platform for information processing (block diagram) The history of computing hardware is the record of the ongoing effort to make computer hardware faster, cheaper, and capable of storing more data. Computing hardware… … Wikipedia
automata theory — Body of physical and logical principles underlying the operation of any electromechanical device (an automaton) that converts information input in one form into another, or into some action, according to an algorithm. Norbert Wiener and Alan M.… … Universalium
Computer — For other uses, see Computer (disambiguation). Computer technology redirects here. For the company, see Computer Technology Limited. Computer … Wikipedia
History of robots — The history of robots date at least as far back as the ancient legends.Robotics in AntiquityLikely fictional, the Iliad illustrates the concept of robotics by stating that the god Hephaestus made talking mechanical handmaidens out of gold. cite… … Wikipedia
mathematics — /math euh mat iks/, n. 1. (used with a sing. v.) the systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically. 2. (used with a sing. or pl. v.) mathematical procedures,… … Universalium
Europe, history of — Introduction history of European peoples and cultures from prehistoric times to the present. Europe is a more ambiguous term than most geographic expressions. Its etymology is doubtful, as is the physical extent of the area it designates.… … Universalium
