Cardiology Core Curriculum A problem-based approach - part 4 ppt

... that demand particularly high reli- ability. These are known as safety-critical systems. Examples are: ■ fly-by-wire control of an aircraft ■ control of critical processes, such as a power station ■ ... is that they are usually mutually contradictory. As an example to help see how this comes about, consider a pro- gram to carry out a calculation of tax. We could either carry out a cal...

Ngày tải lên: 03/07/2014, 01:20

... ready-made metric for measuring value. This kind of investiga- tion is called investment appraisal or a cost-benefit analysis. The organization expects a return on investment. In this approach ... computer- assisted. Another categorization is: ■ a general purpose system, such as a word processor or a game. This is written and then sold in the market place ■ a tailor-made one-off...

Ngày tải lên: 03/07/2014, 01:20

... These patterns are available for off-the-shelf use, just as classes are available in class libraries. Software engineering patterns are patterns on a larger scale than the simple program seen above. ... displays the board and the pieces on the screen as a game is played. A natural (but as we shall see later flawed) structure would be to see that black and white pieces are instances of c...

Ngày tải lên: 03/07/2014, 01:20

... x; } Encapsulating data makes it clear how data is being accessed and by whom. Data declared as public can be accessed by any part of the software in an uncontrolled fashion. Encapsulation is ... of Reusable Object- Oriented Software, Addison-Wesley, 1995. This book is a readable catalog. Although the code examples are given in Java, you do not need to know about Java, or use Java to unde...

Ngày tải lên: 03/07/2014, 01:20

... a scripting language is that it provides a facility to invoke other programs. The programs can be passed information as parameters or alter- natively the programs can pass information as data ... the data it is processing. In contrast, a strongly typed data language insists on the clear separation of data types. What is the essential difference between a scripting language and a pro...

Ngày tải lên: 03/07/2014, 01:20

... the system are usually vague and ill- defined. In consequence, any planning is at best tentative. As the requirements become clearer, more meaningful and accurate plans can be made. Replanning – ... inapplicable to particular domains and can therefore be disregarded. For example, prototyping is not usually of any use in developing scien- tific or mathematical software. Again, data structure ....

Ngày tải lên: 03/07/2014, 01:20

... program generators and automated tools. Long-term, traditional procedural programming languages may vanish to be replaced by declarative languages (functional and or logic languages) – at least for application ... are not a part of UML, and the information in a data flow diagram cannot be described in UML. Now it may be that diagrams such as dataflow are redundant, but alternatively it...

Ngày tải lên: 03/07/2014, 01:20

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Ngày tải lên: 10/08/2014, 05:20

... Vector Algebra 9 scalar. If the scalar is negative, the direction of the vector is reversed: aA = aAi. + aA,i, + aA i, 1-2 -3 Addition and Subtraction The sum of ... the area of the parallelogram formed with A and B as adjacent sides. Interchanging the order of A and B reverses the sign of the cross product: AxB= -BxA AxB BxA=-AxB Figure...

Ngày tải lên: 03/07/2014, 02:20

... can be a manifestation of many different diseases, but hemorrhagic red papules that do not blanch with pressure indicate palpable purpura characteristic of necrotizing vasculitis (Fig. 5 2 -4 ). ... correlates highly with diagnosis (Fig. 5 2-6 ). For example, a hospitalized patient with a generalized erythematous exanthem is more likely to have a drug eruption than is a patie...

Ngày tải lên: 06/07/2014, 20:20