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What is DRAM?

Asked by Gaurav Montu in Computers & Technology at 7:35 AM on December 07, 2008

ayisha's Answer

Pronounced dee-ram, DRAM stands for dynamic random access memory, a type of memory used in most personal computers.
DRAM is the most common form of RAM.
When someone says that a computer has "one gigabyte of RAM", what they really mean is that the computer has one gigabyte of DRAM.
DRAM is called dynamic because it must constantly be refreshed or it will lose the data which it is supposed to be storing.
Refreshing DRAM consists of reading the contents from the DRAM and immediately writing them back to the DRAM.
DRAM is made up of large arrays of very small capacitors. Each of these capacitors is slowly leaking energy, and if the DRAM is not refreshed, eventually one or more of the capacitors will leak enough energy that a 1 will become a 0 and data corruption will occur.
DRAM is often contrasted with SRAM (Static RAM). SRAM is able to store data as long as power is applied to it, without needing to be refreshed. SRAM is also able to be faster than DRAM. The drawback, of course, is that SRAM is much more expensive than DRAM.
Both DRAM and SRAM lose their contents when the power to them is turned off.

Answered at 4:30 PM on December 07, 2008

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Wha ts is ECC RAM?

Asked by Gaurav Montu in Computers & Technology at 7:36 AM on December 07, 2008

ayisha's Answer

Short for Error-Correcting Code memory, a type of memory that includes special circuitry for testing the accuracy of data as it passes in and out of memory.

Answered at 4:28 PM on December 07, 2008

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What is the meaning of the word Xvid...?

Asked by Nitin K in Computers & Technology at 11:19 AM on December 07, 2008

ayisha's Answer

An open source MPEG-4 video codec. XviD was created to offer a free alternative to other commercial video codecs. The XviD codec makes it possible to compress a full-length DVD-quality movie enough to fit on one or two CDs, depending on the length of the movie. To play XviD videos you first need to install the XviD codec on your computer.

Answered at 4:16 PM on December 07, 2008

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Can anybody give me complete infomation about developing a portal?

Asked by Win One in Computers & Technology at 9:31 AM on December 07, 2008

ayisha's Answer

Hi Win one here is ur answers. This tutorial helps you learn how to create a portal and portlets using WebLogic Portal in the Workshop for WebLogic workbench. For m ore detailed information about each dialog of the wizards used in this chapter, refer to the Portal Development Guide.
Before You Begin :
The tasks described in this chapter are based on those described in Setting Up Your Portal Development Environment, so it is important that you complete that tutorial before starting the tasks described here.
Tutorial Steps
Using the tutorial, you will create a portal and two portlets, create an additional page for the portal, and then place the portlets onto a page of the portal.
The tutorial includes instructions on how to perform these tasks:
Create a Portal
Add a Page to Your Portal
Deploy and View Your New Portal
Create Portlets
Add Portlets to the Portal and View the Result
Create a Portal
In this task you will create a portal for the project that you created in Create a Portal Web Project.
To create a portal, perform these steps:
If the Portal perspective is not already open, select it by choosing Window > Open Perspective > Portal.
Using the Portal perspective is optional, but the instructions and figures in this tutorial are based on the views that are available in the Portal perspective.
Navigate to the myPortalWebProject/WebContent directory, right-click and then select New > Portal.
The New Portal dialog displays, as shown in Figure 3-1.
Because you started this wizard by right-clicking the web content directory, the parent folder field automatically displays that directory name. As a best practice, you should locate your portal file in a web content directory that is subordinate to the web project directory. The default web content directory name is WebContent, and is assigned when you use the Portal Web Project Wizard. You can change the name of your web content directory if you wish; for more information, refer to the Portal Development Guide.

In the File name field, enter myPortal.
A file type of .portal is required for portals; you can type the .portal extension to the portal's name if you wish, but WebLogic Portal automatically adds the extension if you don't enter it.

Click Finish.
The wizard adds myPortal.portal to the WebContent folder in the Portal web project and a view of the portal displays in the workbench,
Just go through this link i guess u get ur answers :
http://e-docs.bea.com/wlp/docs92 /tutorials/create_portal.html

Answered at 4:20 PM on December 07, 2008

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What is agent in computer terminology?

Asked by Maddy in Computers & Technology at 11:40 AM on December 07, 2008

ayisha's Answer

A program that performs some information gathering or processing task in the background. Typically, an agent is given a very small and well-defined task.
Although the theory behind agents has been around for some time, agents have become more prominent with the growth of the Internet. Many companies now sell software that enables you to configure an agent to search the Internet for certain types of information.
In computer science, there is a school of thought that believes that the human mind essentially consists of thousands or millions of agents all working in parallel. To produce real artificial intelligence, this school holds, we should build computer systems that also contain many agents and systems for arbitrating among the agents' competing results.

Answered at 4:14 PM on December 07, 2008

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What is RAS Precharge Time?

Asked by Gaurav Montu in Computers & Technology at 7:36 AM on December 07, 2008

ayisha's Answer

This BIOS feature sets the number of cycles required for the RAS to accumulate its charge before another row can be activated. If the RAS Precharge Time is too long, it will reduce performance by delaying all row activations. Reducing the precharge time to 2 improves performance by allowing a new row to be activated earlier.

However, the short precharge time of 2 may be insufficient for some memory modules. In such cases, the active row may lose its contents before they can be returned to the memory bank and the row deactivated. This may cause data loss or corruption when the memory controller attempts to read from the active row or write to it.

Therefore, it is recommended that you reduce the SDRAM RAS Precharge Time to 2 for better performance but increase it to 3 or 4 if you experience system stability issues after reducing the precharge time.
Sources:
http://www.techarp .com/showfreebog.aspx?lang=0&bogno= 195

Answered at 4:26 PM on December 07, 2008

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Aren’t XML, SGML and HTML all the same?

Asked by Maddy in Computers & Technology at 11:42 AM on December 07, 2008

ayisha's Answer

Not quite; SGML is the mother tongue, and has been used for describing thousands of different document types in many fields of human activity, from transcriptions of ancient Irish manuscripts to the technical documentation for stealth bombers, and from patients' clinical records to musical notation. SGML is very large and complex, however, and probably overkill for most common office desktop applications.

XML is an abbreviated version of SGML, to make it easier to use over the Web, to make it easier for you to define your own document types, and to make it easier for programmers to write programs to handle them. It omits all the complex and less-used options of SGML in return for the benefits of being easier to write applications for, easier to understand, and more suited to delivery and interoperability over the Web. But it is still SGML, and XML files may still be processed in the same way as any other SGML file (see the question on XML software).

HTML is just one of many SGML or XML applications—the one most frequently used on the Web.

Technical readers may find it more useful to think of XML as being SGML−− rather than HTML++.

Sources:
http://xml.silmaril.i e/faq.html#differences..

Answered at 4:12 PM on December 07, 2008

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How do I automatically scan downloaded files for viruses in Flashget?

Asked by Roshank in Computers & Technology at 12:08 PM on December 07, 2008

ayisha's Answer

Go to the Tools menu, then Options... , then File Manager. Select the Use virus scanner to scan the downloaded file(s) checkbox. Now specify the path of the required exe file and its instruction variable. For example:
McAfee AntiVirus C:\Program Files\McAfee\VirusScan95\scan95, args /autoscan /nosplash
Norton AntiVirus C:\Program Files\Norton Antivirus\navw32.exe, Args (empty)
Alternatively, right-click on any downloaded jobs and choose Virus Scan.
Sources:
http://www.flashge t.com/doc/faq.htm#q15

Answered at 4:09 PM on December 07, 2008

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Why XML suxh an important development?

Asked by Rajashree . in Computers & Technology at 12:09 PM on December 07, 2008

ayisha's Answer

It removes two constraints which were holding back Web developments:
1. dependence on a single, inflexible document type (HTML) which was being much abused for tasks it was never designed for;
2. the complexity of full SGML, whose syntax allows many powerful but hard-to-program options.
XML allows the flexible development of user-defined document types. It provides a robust, non-proprietary, persistent, and verifiable file format for the storage and transmission of text and data both on and off the Web; and it removes the more complex options of SGML, making it easier to program for.
Sources:
http://dev.fyicenter.co m/Interview-Questions/XML/Why_is_XM L_such_an_important_development_.ht ml

Answered at 4:03 PM on December 07, 2008

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What is the difference between SGML/XML and C or C++?

Asked by Rajashree . in Computers & Technology at 12:09 PM on December 07, 2008

ayisha's Answer

SGML (ISO 8879), or the Standard Generalized Markup Language, is the international standard for defining descriptions of structure and content in electronic documents.
XML is a simplified version of SGML; XML was designed to maintain the most useful parts of SGML.
Whereas SGML requires that structured documents reference a Document Type Definition (DTD) to be "valid," XML allows for "well-formed" data and can be delivered without a DTD. XML was designed so that SGML can be delivered, as XML, over the Web.
What does XML mean to SGML product vendors? On the technology front, SGML products should be able to read valid XML documents as they sit, as long as they are in 7-bit ASCII. To read internationalized XML documents, (for example in Japanese) SGML software will need modification to handle the ISO standard 10646 character set, and probably also a few industry-but-not-ISO standard encodings such as JIS and Big5. To write XML, SGML products are going to have to be modified to use the special XML syntax for empty elements.
On the business front, much depends on whether the Web browsers learn XML. If they do, SGML product vendors should brace for a sudden, dramatic demand for products and services from all the technology innovators who are, at the moment, striving to get their own extensions into HTML, and will (correctly) see XML as the way to make this happen. If the browsers remain tied to the fixed set of HTML tags, then XML will simply be an easy on-ramp to SGML, important probably more because the spec is short and simple than because of its technical characteristics. This will probably still generate an increase in market size, but not at the insane-seeming rate that would result from the browers' adoption of XML.
C++ is an Object Oriented programming language where standard C was not.
Basically, you can build sets of code and embed them inside one another and have them relate to one another. You could not do this easily in C language.
Such a code set is called a Class.
This comes in real handy when trying to make computer instructions that depend on one another and reuse one another. It made writing programs Object Oriented rather than something that had to be processed line by line in a linear sequence.
As far as I'm concerned, I was glad to learn C++ and not bother with C at all. C++ actually made more sense to me.
The best guide for learning C++ is to take the classes. Programming with it takes a different way of thinking and you'll need to learn how to think that way. It will take you a while to master it, but it is very powerful and very useful in making computer programs of any kind.

Answered at 4:06 PM on December 07, 2008

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