Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers ______ through a real-time communication network such as the Internet. In science, cloud computing is a ______ for distributed computing over a network, and means the ______ to run a program or application on many connected computers at the same time. The architecture of a cloud is developed at three layers: infrastructure, platform, and application. The infrastucture layer is built with virtualized compute storage and network resources. The platform layer is for general-purpose and repeated usage of the collection of software resources. The application layer is formed with a collection of all needed software modules for SaaS applications. The infrastucture layer serves as the ______ for building the platform layer of the cloud. In turn, the platform layer is foundation for implementing the ______ layer for SaaS application.
People are indulging in an illusion whenever they find themselves explaining at a cocktail (鸡尾酒) party, say, that the are "in computers", or " in telecommunications", or "in electronic funds transfer". The implication is that they are part of the high-tech world. Just between us, they usually aren't. The researchers who made fundamental breakthroughs in those areas are in a high-tech business. The rest of us are 30 of their work. We use computers and other new technology components to develop our products or to organize our affairs. Because we go about this work in teams and projects and other tightly knit working group (紧密联系在一起的工作小组), we are mostly in the human communication business. Our successes stem from good human interactions by all participants in the effort, and our failures stem from poor human interactions. The main reason we tend to focus on the 31 rather than the human side of work is not because it's more 32 , but because it's easier to do. Getting the new disk drive installed is positively trivial compared to figurine out why Horace is in a blue funk (恐惧) or why Susan is dissatisfied with the company aver only a few months. Human interactions are complicated and never very crisp (干脆的，干净利落的) and clean in their effects, but they matter more than any other aspect of the work. If you find yourself concentrating on the 33 rather than the 34 . you're like the vaudeville character (杂耍人物) who loses his Keys on a dark street and looks for them on the adjacent street because, as he explains, "The light is better there!"
The Rational Unified Process (RUP) is a software engineering process, which captures many of best practices in modern software development. The notions of 38 and scenarios have been proven to be an excellent way to capture function requirements. RUP can be described in two dimensions - time and content. In the time dimension, the software lifecycle is broken into cycles. Each cycle is divided into four consecutive 39 which is concluded with a well-defined 40 and can be further broken down into 41 - a complete development loop resulting in a release of an executable product, a subset of the final product under development, which grows incrementally to become the final system. The content structure refers to the disciplines, which group 42 logically by nature.
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