New PDF release: Alan Turing: The Enigma (The Centenary Edition)

By Andrew Hodges

It is just a moderate exaggeration to assert that the British mathematician Alan Turing (1912-1954) kept the Allies from the Nazis, invented the pc and synthetic intelligence, and expected homosexual liberation through decades--all ahead of his suicide at age 41. This vintage biography of the founding father of machine technology, reissued at the centenary of his start with a considerable new preface by way of the writer, is the definitive account of a unprecedented brain and existence. A gripping tale of arithmetic, desktops, cryptography, and gay persecution, Andrew Hodges's acclaimed booklet captures either the internal and outer drama of Turing's life.

Hodges tells how Turing's progressive proposal of 1936--the thought of a common machine--laid the root for the fashionable machine and the way Turing introduced the assumption to useful awareness in 1945 together with his digital layout. The booklet additionally tells how this paintings used to be at once with regards to Turing's best function in breaking the German Enigma ciphers in the course of international battle II, a systematic triumph that used to be serious to Allied victory within the Atlantic. whilst, this is often the tragic tale of a guy who, regardless of his wartime provider, used to be ultimately arrested, stripped of his safety clearance, and compelled to suffer a humiliating remedy program--all for attempting to stay in truth in a society that outlined homosexuality as a criminal offense.

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Extra info for Alan Turing: The Enigma (The Centenary Edition)

Example text

Corresponding to each timed schedule is a unique, untimed schedule which preserves the time stamp order of events in the timed schedule. 1 CHAPTER 3 CORRECTNESS CRITERIA Related Work In conventional databases, the notion of correctness of a schedule has mainly been based on the concept of serializability [23]. Three increasingly restrictive criteria for correctness are commonly accepted and have been studied in depth. They are: final-state serializability, view serializability, and conflict serializability [23].

Methods that allow users to select the level of flexibility between serializability and timeliness, and between result precision and resource requirement need to be studied. • Many real-time applications are safety-critical. RTDBs used in these applications must support fault tolerance and recovery. System or task recovery in RTDBs must consider time and resource availability to perform recovery without jeopardizing ongoing transactions. Real-time transaction and data semantics must be exploited to minimize recovery overheads.

However, it is imperative for us to justify and make explicit the implicit assumptions that are behind the currently ad hoc engineering practice. They can be the cause of costly errors. A. Bestavros et al. ), Real-Time Database Systems © Kluwer Academic Publishers 1997 40 CHAPTER 3 In this chapter, we provide a theoretical framework for integrating the similarity concept into database concurrency control theory. We also describe a class of real-time data-access protocols called SSP (Similarity Stack Protocols) based on the concept of similarity.

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Alan Turing: The Enigma (The Centenary Edition) by Andrew Hodges

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