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Software ProcessThe software process is the set of actions and related results which produce a software product. These actions are mostly carried out by software developers. CASE is computer-aided software engineering tools are used to help with some process activities. There are 4 basic process activities that http://replace.me/15186.txt applicable to all software processes.
Different software processes divide these activities in different ways. The timing and result nero 8 ultra edition 8.3 6.0 thai keygen free the each activity varies as per software process.
Using different processes different types of software product may be produced by an organization. However, it may possible that for particular application some processes are more suitable than others type of processes. If the wrong process is used, this will probably decreases the quality or the usefulness of the software product to be developed. Because there are a number of different processes models are used, it is impossible to produce reliable figures for cost distribution across these activities.
This percentage is rising as more and more software is produced nero 8 ultra edition 8.3 6.0 thai keygen free has to be maintained. Designing software for change is vital. Complex software processes involve a variety of activities.
Processes have following attributes or characteristics: 1 Understandability : To what level is the process explicitly defined and how easy is it to understand the process читать статью If a rapid development process is needed then it may be necessary to decrease the process visibility, making a process visible means producing documents at regular intervals. This will slow down the process. There are varieties of different general models or paradigms of software development: 1 The waterfall approach: This takes the above actions and represents them as separate process phase such as requirements specification, software design, implementation, testing and so on.
This is first explicit model of the software development process was derived from other engineering process. This was enthusiastically accepted by software project management. It offered a means of making the development process more visible. An initial system is rapidly developed from very abstract definitions. The system may then be transported.
Alternatively, it may be re-implemented using a more planned approach to produce a more robust and maintainable system. Evolutionary development based on the idea of designing an initial implementation, exposing this to user comment and refining these through many versions until an adequate system has been developed. Rather than have separate specification, development and validation actions, these are carried out concurrently with rapid feedback across these activities.
The system development process concentrates on integrating these parts rather than developing them from scratch. The fist two of these approaches, namely waterfall approach and evolutionary development are now widely used for practical systems development.
Some systems have been built using correctness-preserving nero 8 ultra edition 8.3 6.0 thai keygen free but this is still an experimental process. When you listen to the news, you hear about many different forms of electronic infection. The most common are: Viruses – a virus is a tiny piece of software that piggybacks on real programs. For example, a virus might attach itself to a program such as a spreadsheet program.
Each time the spreadsheet program runs, the virus runs, too, and it has the chance to reproduce nero 8 ultra edition 8.3 6.0 thai keygen free attaching to other programs. E-mail viruses – an e-mail virus move around in email messages, and usually replicate itself by automatically mailing itself to dozens of people in the victim’s e-mail address book. Trojan horses – a Trojan horse is simply a computer program. The program claims to do one thing it may claim to be a game but instead does damage when you run it it may erase your hard disk.
Trojan horses cannot automatically replicate. Worms – A worm is a small piece of software that uses computer networks and security holes to replicate itself.
A copy of the worm scans the network for another machine that has a specific security hole. It copies itself to the new machine using the security hole, and then starts replicating from there, as well. The best way to start is with admitting the truth: People created viruses. Out there are people who do more than play games or watch TV shows. A computer virus is a computer program that can copy itself and infect a computer without permission or knowledge of the user.
The original one may modify the copies, or the copies may modify themselves, as in a читать статью nero 8 ultra edition 8.3 6.0 thai keygen free virus, so it is harder to be traced and deleted. A virus cannot move by itself from one computer to another, it can only spread when its host is taken to the uninfected computer, for instance, a user sending it over a network or carrying it on a removable medium such as a floppy disk, CD, or Nero 8 ultra edition 8.3 6.0 thai keygen free drive.
In studying computer viruses you will be amazed of how many interesting things you can discover and see! Viruses have some interesting points. On the one hand, viruses show us how vulnerable нажмите чтобы прочитать больше are. On the other hand, they show how sophisticated and interconnected human beings have become. Computer viruses are called viruses because they share some of the traits of biological viruses. A computer virus passes from computer to computer as a biological virus passes from person to person.
There are similarities at a deeper level, as well. A biological virus is not a living thing. A virus is a fragment of DNA inside a protective jacket. Unlike a cell, a virus has no way to do anything or to reproduce by itself — it is not alive. Instead, a biological virus must inject its DNA into a cell. The viral DNA then uses the cell’s existing machinery to reproduce itself.
In some cases, the cell fills with new viral particles until it bursts, releasing the virus. In other cases, the new virus particles bud off the cell one at a time, and the cell remains alive. A computer virus must piggyback on top of some other program or document and once it is running, it is then able to infect other programs or documents. As virus creators http://replace.me/1669.txt more sophisticated, they learned new tricks.
An important one was the ability to load viruses into memory so they could keep running in the background as long as the computer remained on. This new way to work gave viruses a better way to replicate themselves. Another trick was the ability to infect the boot sector of the hard disk or floppy disc. The boot sector is a small program, which is the nero 8 ultra edition 8.3 6.0 thai keygen free part of the operating system the computer loads.
The boot sector contains a small program that tells the computer how to load the rest of the operating system. By putting its code in the boot sector, a virus can is guaranteed to be “at work” each time the computer is on. If you can, try to use more safe operating systems, like UNIX. If you use Windows, a good idea is to buy some protective software, like antivirus programs and firewalls.
Also, never double on an attachment that contains an executable file. We live in a world where both computer and biological viruses are surrounding us. Even if we will, until then the only way is to protect ourselves.
Software Reuse. Software Nero 8 ultra edition 8.3 6.0 thai keygen free component reuse does not just indicate the reuse of application code. It is possible to reuse specification and designs. The potential gains from reusing abstract product of development process such as specifications may be grater than those from reusing code components.
In most engineering disciplines the developed process is based on components reuse. Software system design usually consider that all component to be designed specially for the system being developed. There is no common base apart from libraries such as windows system libraries of reusable software components. By using widespread and systematic software reuse demands for lower software design and maintain costs along with increased quality can only be met.
Software components are not designed to one system but are tried and tested in a number of different environments. Design and implementations fault are discovered and removed so that reusable component contains few errors. It is impossible to achieve absolute reliability specification but reusable components may have an associated quality explanation. This permits users nero 8 ultra edition 8.3 6.0 thai keygen free integrate them with confidence in their systems.
Software component источник does not just indicate the reuse of application code. The reuse of software can be divided at a number of levels: 1 Application system reuse: It is possible to reuse the whole application system. The major problem here is to ensure that the software is portable. It should run on variety different platforms. Application system reuse is widely used in software companies windows 10 no boot black screen free download implement their systems across a range of machines.
Function reuse is widely used in standard libraries of reusable function such as graphics and mathematical libraries. Sub-system and module reuse are less usable.
Four aspects of software reuse are: nero 8 ultra edition 8.3 6.0 thai keygen free Software development with reuse: Software development with reuse is an approach which tries to maximize the reuse of existing software components.
Benefit of this approach is that overall development costs of the software are decreased. Cost reduction is only one potential benefit of software reuse. Systematic reuse in the development offers further nero 8 ultra edition 8.3 6.0 thai keygen free i System reliability is increased: By using reused components in working systems should be more reliable than new components.
These components have been tested in variety of operational systems environment and have therefore been exposed to realistic operating conditions. For project management this is important factor as it decreases uncertainty in project cost elimination. If relatively large components such as sub-stems are reused then this becomes true. Reusing software components speeds up system production because both development and validation time should be reduced.
In this approach reusable knowledge is confined in a program generator system which can be programmed in a domain oriented language.