Engineers of Dreams: Great Bridge Builders and the Spanning by Henry Petroski

By Henry Petroski

Petroski unearths the technology and engineering--not to say the politics, egotism, and sheer magic--behind America's nice bridges, rather these developed throughout the nice bridge-building period beginning within the 1870s and carrying on with throughout the Thirties. it's the tale of the lads and girls who equipped the St. Louis, the George Washington, and the Golden Gate bridges, drawing not just on their mastery of numbers yet on their presents for persuasion and self-promotion. it's an account of triumphs and ignominious failures (including the Tacoma Narrows Bridge, which accurately twisted itself aside in a excessive wind). And all through this grandly enticing ebook, Petroski we could us see how bridges grew to become the "symbols and souls" of our civilization, in addition to testaments to their builders' imaginative and prescient, ingenuity, and perseverance.

"Seamlessly linked...With brilliant scope and generosity of view, Mr. Petroski areas the culture of yank bridge-building in perspective."--New York instances e-book evaluation

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Extra info for Engineers of Dreams: Great Bridge Builders and the Spanning of America

Sample text

Stated very simply, for computer system developments, the hardware must be engineered in addition to the system's software. However, we must be careful not to repeat the widely used development paradigm presented in Chapter 1, where the system is divided into software and hardware components at a very early stage, and these are then engineered almost in isolation, each following standard hardware and software development paths. One could consider this approach as 'the engineering of hardware and software components to produce a computer system', whereas more modern approaches to computer system development, including the one presented in this book, are concerned with the engineering of computer systems, some parts of which will be implemented in software and other parts in hardware.

The first three phases defined in Fig. 6 are manual operations, albeit assisted by MOOSEbench, concerned with developing an architecture, specifying behaviour so as to produce an Executable Model, and applying Transformational Codesign techniques to the Executable Model to prepare for the synthesis of the implementation. These phases are described in detail in Chapters 5, 6 and 8. The Platform Model shown in Fig. 6 is developed from the total system model to show the relationship between all of the hardware in the system, which includes all the special purpose hardware, processors, buses and interconnect mechanisms, and the software interfaces into this hardware.

For the former, the model can become the implementation through a process of refinement and the approach is generally used for information systems (Alavi 1984) where the run-time performance of the 4GL implementation is often acceptable. However, a 4GL implementation would not be suitable for reactive system development due to run-time overheads. For Operational Specifications, the model is developed in a specification language and is translated, sometimes manually, into a standard procedural language for execution.

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