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Computers
This category includes questions and answers about computers and everything related to computers.
48,002 Questions
Helpful Tips to Help You Get the Most Out of Your DDR2 RAM?
Random access memory, or RAM, is important if you are going to have a lot of different computer programs running at the same time. Also, some programs require more RAM than others, so depending on what you will use your computer for, you might need more RAM. DDR2 RAM is only compatible with motherboards that are equipped to handle DDR2 RAM. Before adding any DDR2 RAM to your computer, make sure that your motherboard will work with it. Some computer motherboards are compatible with only DDR or DDR3 RAM, which would make your DDR2 RAM worthless and possibly damaging.
Understand Computer Hardware for SQL Training?
A good knowledge of basic computer hardware will prepare you to understand the mechanics of computers and servers that are essential for data processing. Take as many hardware courses as possible to understand CPU, permanent and temporary memory requirements. This technology is constantly improving and will shape SQL software.
What is meant by new laptop computer?
A new laptop computer is one which is brand new, never opened, and never owned by anyone. These are the best to buy because no one has used them to download things on them and make them run slow.
The best PC laptop is not necessarily the most expensive. Check when stores are having clearance sales on their electronics in order to find the best deals. Some computers will be marked at a fraction of the cost at the end of each sales season in order to make room for the newer inventory.
What Shops Online Have the Laptop Computers Best Prices?
Have you been wondering what online stores have the laptop computers best prices? The best way to tell is to frequently search the internet when you are going to consider buying a new laptop. Since inventories at these sites are updated often, there is no way to predict just what is going to appear for sale with some of these online retailers.
The website, http://reviews.cnet.com/desktop-computers/?tag=hdr;brandnav, will help you choose a desktop computer that is best for you. They compare computers based on price, RAM, storage space, and many other attributes.
Use A Dedicated Computer Chair?
If you're using an inferior chair with your home office, consider switching to a dedicated computer chair to make sure you're posture is good and comfort is maintained. A bad chair causes long term damage.
Has Bill Gates been charge with murder?
In 1977, Bill Gates was arrested by New Mexico police for speeding.
Software Development Life Cycle Models and Methodologies
Introduction
The software industry includes many different processes, for example, analysis, development, maintenance and publication of software. This industry also includes software services, such as training, documentation, and consulting.
Our focus here about software development life cycle (SDLC). So, due to that different types of projects have different requirements. Therefore, it may be required to choose the SDLC phases according to the specific needs of the project. These different requirements and needs give us various software development approaches to choose from during software implementation.
Types of Software developing life cycles (SDLC)
· Waterfall Model
· V-Shaped Model
· Evolutionary Prototyping Model
· Spiral Method (SDM)
· Iterative and Incremental Method
· Extreme programming (Agile development)
Waterfall Model
Description
The waterfall Model is a linear sequential flow. In which progress is seen as flowing steadily downwards (like a waterfall) through the phases of software implementation. This means that any phase in the development process begins only if the previous phase is complete. The waterfall approach does not define the process to go back to the previous phase to handle changes in requirement. The waterfall approach is the earliest approach that was used for software development.
The usage
Projects did not focus on changing requirements, for example, responses for request for proposals (RFPs)
Advantages and Disadvantages
Advantages
Disadvantages
· Easy to explain to the user· Structures approach.· Stages and activities are well defined· Helps to plan and schedule the project
· Verification at each stage ensures early detection of errors / misunderstanding
· Each phase has specific deliverables
· Assumes that the requirements of a system can be frozen· Very difficult to go back to any stage after it finished.· Little flexibility and adjusting scope is difficult and expensive.· Costly and required more time, in addition to detailed plan
V-Shaped Model
Description
It is an extension for waterfall model, Instead of moving down in a linear way, the process steps are bent upwards after the coding phase, to form the typical V shape. The major difference between v-shaped model and waterfall model is the early test planning in v-shaped model.
The usage
· Software requirements clearly defined and known
· Software development technologies and tools is well known
Advantages and Disadvantages
Advantages
Disadvantages
· Simple and easy to use.· Each phase has specific deliverables.· Higher chance of success over the waterfall model due to the development of test plans early on during the life cycle.· Works well for where requirements are easily understood.
· Very inflexible, like the waterfall model.· Little flexibility and adjusting scope is difficult and expensive.· Software is developed during the implementation phase, so no early prototypes of the software are produced.· Model doesn't provide a clear path for problems found during testing phases.
· Costly and required more time, in addition to detailed plan
Evolutionary Prototyping Model
Description
It refers to the activity of creating prototypes of software applications, for example, incomplete versions of the software program being developed. It is an activity that can occur in software development. It used to visualize some component of the software to limit the gap of misunderstanding the customer requirements by the development team. This also will reduce the iterations may occur in waterfall approach and hard to be implemented due to inflexibility of the waterfall approach. So, when the final prototype is developed, the requirement is considered to be frozen.
It has some types, such as:
· Throwaway prototyping: Prototypes that are eventually discarded rather than becoming a part of the finally delivered software
· Evolutionary prototyping: prototypes that evolve into the final system through iterative incorporation of user feedback.
· Incremental prototyping: The final product is built as separate prototypes. At the end the separate prototypes are merged in an overall design.
· Extreme prototyping: used at web applications mainly. Basically, it breaks down web development into three phases, each one based on the preceding one. The first phase is a static prototype that consists mainly of HTML pages. In the second phase, the screens are programmed and fully functional using a simulated services layer. In the third phase the services are implemented
The usage
· This process can be used with any software developing life cycle model. While this shall be focused with systems needs more user interactions. So, the system do not have user interactions, such as, system does some calculations shall not have prototypes.
Advantages and Disadvantages
Advantages
Disadvantages
· Reduced time and costs, but this can be disadvantage if the developer lose time in developing the prototypes· Improved and increased user involvement
· Insufficient analysis· User confusion of prototype and finished system· Developer misunderstanding of user objectives· Excessive development time of the prototype
· Expense of implementing prototyping
Spiral Method (SDM)
Description
It is combining elements of both design and prototyping-in-stages, in an effort to combine advantages of top-down and bottom-up concepts. This model of development combines the features of the prototyping model and the waterfall model. The spiral model is favored for large, expensive, and complicated projects. This model uses many of the same phases as the waterfall model, in essentially the same order, separated by planning, risk assessment, and the building of prototypes and simulations.
The usage
It is used in shrink-wrap application and large system which built in small phases or segments.
Advantages and Disadvantages
Advantages
Disadvantages
· Estimates (i.e. budget, schedule, etc.) become more realistic as work progresses, because important issues are discovered earlier.· Early involvement of developers· Manages risks and develops system into phases
· High cost and time to reach the final product.· Needs special skills to evaluate the risks and assumptions· Highly customized limiting re-usability
Iterative and Incremental Method
Description
It is developed to overcome the weaknesses of the waterfall model. It starts with an initial planning and ends with deployment with the cyclic interactions in between. The basic idea behind this method is to develop a system through repeated cycles (iterative) and in smaller portions at a time (incremental), allowing software developers to take advantage of what was learned during development of earlier parts or versions of the system.
The usage
It is used in shrink-wrap application and large system which built in small phases or segments. Also can be used in system has separated components, for example, ERP system. Which we can start with budget module as first iteration and then we can start with inventory module and so forth.
Advantages and Disadvantages
Advantages
Disadvantages
· Produces business value early in the development life cycle· Better use of scarce resources through proper increment definition· Can accommodate some change requests between increments· More focused on customer value than the linear approaches
· Problems can be detected earlier
· Requires heavy documentation· Follows a defined set of processes· Defines increments based on function and feature dependencies· Requires more customer involvement than the linear approaches
· Partitioning the functions and features might be problematic
· Integration between iteration can be an issue if this is not considered during the development.
Extreme programing (Agile development)
Description
It is based on iterative and incremental development, where requirements and solutions evolve through collaboration between cross-functional teams.
The usage
It can be used with any type of the project, but it needs more involvement from customer and to be interactive. Also, it can be used when the customer needs to have some functional requirement ready in less than three weeks.
Advantages and Disadvantages
Advantages
Disadvantages
· Decrease the time required to avail some system features.· Face to face communication and continuous inputs from customer representative leaves no space for guesswork.· The end result is the high quality software in least possible time duration and satisfied customer
· Scalability· Skill of the software developers· Ability of customer to express user needs· Documentation is done at later stages
· Reduce the usability of components.
· Needs special skills for the team.
The name originated with a user named ajack on esato.com. Ajack was in a bank, searching for other BT enabled devices. When he found a Nokia 7650, he sent the owner a message saying "Buy Ericsson". He called it bluejacking, and it stuck ever since
Blue Jacking is the process of sending information, often anonymously, to devices by a wireless standard known as Bluetooth. The way this is done is by creating a new phone book entry and placing your information in the name entry then sending it to a nearby device which is Bluetooth enabled. Your information, an audible message or picture, should be heard by the user or seen to pop up on the screen of the retrieving device.
I have attached a link which should explain this better. That link can be found below.
Is there an easy free way to make avatars on Whirled without doing code?
There is a link below for almost every listed kawaii and furry avabile on whirled below.
How do you turn off the led light show on sony VAIO?
Open VAIO Central and go to the "Other" submenu and you will see LED Illumination.
First, is the screen power on? If not, you might have a Trojan horse or worm rejecting the computer to turn on. But maybe the computer is old.
What is pattern of the ISRO exam for recruitment of Enggscientists Electrinics?
Here is the examination pattern for ISRO placement examination Total no of questions: 80
Duration: 90 minutes
Marking: +3 for correct answer -1 for wrong
Total sections : 1 However, the syllabus for the exam is never given, but it is based on the graduation level studies..
What are three short term benefits of using pesticides?
Pesticides have short-term benefits. Firstly, pesticides prevent immediate damage of crops from stress, weakness, and disruption of growth patterns. Pesticides disrupt the pest life cycle, for example, if an insect is in the pre-mating phase and it is eliminated, then the mating phase falls out. Finally, due to the killing of weeds, the plant receives more nutrients, light, and water. It also eliminates the threat of diseases that the weed might carry and transfer to the plants that are grown.
Which was the first language to be more powerful than a Turing Machine?
this question is a joke, if you're being asked it, you're being fooled. :)
How much gigabytes does 667 songs take up?
Depends upon what size each of these 667 songs are and at what bit rate was used to make the recordings. Songs are usually of varying length, too ... the longer songs obviously will consume more drive space.
Redundant array of inexpensive disks. Its a cheap method of backing up data in a running server.
How do you open the repair folder to extract auto exe file?
Open C drive, open your windows folder, double click on repair folder, right click on file you need, select copy, send copy of file to destination folder. If you can not view files and folders in your windows folder, select "show contents of this folder". Hope that helps
What is the definition of computer missuse?
Refers to hacking , actions of people who gain access to people who gain access to computer systems when they have no right to do so. The technical term for this is "Unauthorised access" and the computer misuse act, hacking is a criminal offence and id recommend not to.
