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Too complex for complete analysis Separation into non-interacting subsystems distorts the results The most important properties are emergent Too organized for statistics Too much underlying structure that distorts the statistics Organized Complexity\(Weinberg) Copyright Nancy Leveson, Sept 1999
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State Machine specifications Define behavior using states and transitions between states
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Outline: Software Design Goals History of software design ideas Design principles Design methods Life belt or leg iron?(Budgen)
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design: added inheritance, multiple inheritance, and polymorphism to ADT In process added complexity and increased some types of connectivity Lots of claimed advantages -- so far empirical evaluation is not supporting them well
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Abstract Model Specifications Build an abstract model of required software behavior using mathematically defined(perhaps using axioms )types(e. g sets, relations) Define operations by showing effects of that operation on the model Specification includes Model
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Requirements specification: A structured document that sets out the services the system is expected to provide Should be precise so that it can act as a contract between the system procurer and software developer and thus needs to be understandable by procurers and developers
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Difficult Person Hostile-aggressie Bullies, cverwhelms, and intimidates cthers nd up to the hostile ade frot atoers-can t accept feedback on t rush into the worst thing that coul happen?)
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opyright Nancy Leveson, Sept. 1999 Stage 1: Forming Team members begin to discover what behaviors are acceptable Usually highly unstructured environment Attempt to identify tasks, how to accomplish them Decisions on what information is needed Hesitant participation
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Can programming language influence correctness? anguages affect the way we think about problems The tools we use have a profound(and devious) influence on our thinking habits, and, therefore on our thinking abilities?
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介绍了计算塑性加工变形力的一种解法工程法的概念及其要 点。举例解析了直角坐标平面应变问题,极坐标平面应变问题,圆柱坐标轴对 称问题以及球坐标轴对称问题。 教学重点:工程法的要点,直角坐标平面应变问题、极坐标平面应变问题、圆 柱坐标轴对称问题以及球坐标轴对称问题的解析
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