Monday, October 29, 2007

What is HSDPA?

HSDPA, short for High-Speed Downlink Packet Access, is a new protocol for mobile telephone data transmission. It is known as a 3.5G (G stands for generation) technology. Essentially, the standard will provide download speeds on a mobile phone equivalent to an ADSL (Asymmetric Digital Subscriber Line) line in a home, removing any limitations placed on the use of your phone by a slow connection. It is an evolution and improvement on W-CDMA, or Wideband Code Division Multiple Access, a 3G protocol. HSDPA improves the data transfer rate by a factor of at least five over W-CDMA. HSDPA can achieve theoretical data transmission speeds of 8-10 Mbps (megabits per second). Though any data can be transmitted, applications with high data demands such as video and streaming music are the focus of HSDPA.

See also
HSDPA
wikipedia

What is badware?

There are several commonly recognized terms for specific kinds of badware - spyware, malware, and deceptive adware. Badware is malicious software that tracks your moves online and feeds that information back to shady marketing groups so that they can ambush you with targeted ads. If your every move online is checked by a pop-up ad, it's highly likely that you, like 59 million Americans, have spyware or other malicious badware on your computer.

What's particularly tricky about badware is that you may not know that you downloaded it. Some badware manufacturers bundle it with other programs without disclosing that it's part of the package. Others put their programs on your PC when you visit certain websites or play online games.

Unfortunately, incessant pop-up ads aren't the only possible side-effect. Sometimes peoples' computers slow down or even crash. Sometimes peoples' personal information is abused, and there have been reported cases of identity theft. What's even more frustrating is that these programs are hidden in your computer, making it difficult to identify and remove them.

Why do badware providers make the effort? Because it is big business, amounting to a $2 billion-a-year industry. It's the Wild West of aggressive marketing and an industry supported by shadowy online marketers, small application vendors, and website operators.

The best and most important thing is for you to learn how to clean badware off your computer and to share your knowledge with those you know. An important factor when installing any software application is whether you have agreed to its installation and understand what it will do. Certain types of badware not only adversely affect your browsing experience, but how your computer itself functions. Some badware is known to interrupt your internet connection or even cause your computer to crash.

go to this site, to get more about badware - StopBadware.org

Friday, July 27, 2007

DjVu

DjVu (pronounced déjà vu) is a computer file format designed primarily to store scanned images, especially those containing text and line drawings. It uses technologies such as image layer separation of text and background/images, progressive loading, arithmetic coding, and lossy compression for bitonal images. This allows for high quality, readable images to be stored in a minimum of space, so that they can be made available on the web.

DjVu has been promoted as an alternative to PDF, actually outperforming PDF on most scanned documents. The DjVu developers report that color magazine pages compress to 40–70KB, black and white technical papers compress to 15–40KB, and ancient manuscripts compress to around 100KB; all of these are significantly better than the typical 500KB required for a satisfactory JPEG image. Like PDF, DjVu can contain an OCRed text layer, making it easy to perform cut and paste and text search operations.