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By Roy Maclean, Visit Amazon's Susan Stepney Page, search results, Learn about Author Central, Susan Stepney, , Simon Smith, Nick Tordoff

ISBN-10: 0133014339

ISBN-13: 9780133014334

This article describes and explains the ORCA (Object-oriented specifications catch research) strategy. it truly is geared toward these drawn to the outline and research of advanced structures. particularly, it's aimed toward these accountable for generating thoughts for using info expertise and standards for software program improvement. generating and examining types of platforms is a major job in ORCA and complementary modelling languages are supplied for this function. those languages are illustrated in the course of the e-book.

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9 Overview of ORCA In summary, the key ideas of ORCA are: • An analysis process needs to be tailorable. • A system has purposes as well as behaviour. • A system is a network of co-operating roles. • A system may exhibit pathologies. • Models can describe the Old World, or a New World. • A system is embedded in an environment. • IT systems are ways of implementing behaviour. • Models can express different levels of abstraction. The second and third items in this list concern the conceptual basis of ORCA.

Where the client’s world is developing into new areas, for example, there may be nothing useful to say about the Old World. Where external changes are forcing re-evaluation of a previously viable system, the Old World will not be pathological in itself but only in the context of the external changes. 6 A system is embedded in an environment The ‘real world’, which analysis seeks to describe, is a continuum—there are no hard boundaries between different areas. In contrast, a model of a system is necessarily ‘closed’: it is a statement of what is relevant for the purposes of analysis.

Each loom runs at about 100 picks/minute. • Each loom has a ‘warp end breakage detector’, which stops the loom should a warp end break. A warp end breaks every half hour or so during weaving. • Each loom has two electromagnetic jacquard machines, which lift or drop warp threads to allow a shuttle to be passed through. • Each loom has an electromagnetic lifting box, which selects whether a brocade or a ground shuttle should be used on the next pick. • Each loom has a cam arrangement whereby the jacquard can detect what stage of weaving the loom is at, and so whether to lift or drop threads.

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