The Principle Of Retinal And Iris Scanning Technology

Fingerprint method can be misapplied. This reality is proven scientifically correct. For that reason, people then try to find the more reliable biometric systems.

The retina is part of the eyes that is responsible for the ability to see. The pattern of blood vessels that forms the retina is as unique as fingerprint. The principle of retinal scanning technology is scanning the pattern of capillary blood vessels on the retina with low-intensity light sources.

In 1987, the first retinal scanner was made by Leonard Flom and Aram Safir and has been patented. However, by the year 1994, John Daugman developed the technology of iris scanning as a competitor for retinal scanner.

Retinal scanning principle

Retinal scanning is based on the fine capillary network that meets the needs of oxygen and nutrients to the retina. These blood vessels absorb light and can easily be visualized with appropriate lighting. To that end, the close distance between the eyes and a scanner is needed. The appropriate position of eyes toward the scanner is also necessary. Also, there must be no eye movement, such as blink or glance.

Retinal scanning can not be 100 percent accurate. It is also less suitable as a security tool because even though the pattern of capillary blood vessels of human beings’ retinas cannot change generally, but diabetes, glaucoma, and cataracts can change it.

Iris scanning

In its development, retinal scanning is considered to be too disruptive in the case of security detection devices. In the use of retinal scanning, the eyes should be as close as possible with the scanner. For long-term, the light of scanner that is too close to the eye can give negative effects.

Because of the weakness, iris scanning technology emerges as strong competitor. Iris, a network that gives color to the eyes is also unique in which the chance for two identical slices is 1:1,078. Even, the left iris and right iris of someone are different.

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Uninstall CA Internet Security Suite with windows add/remove program – the regular method

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2. Find CA Internet Security Suite inside the program list and right click to pick Delete.

3. Follow the panel wizard and reboot your personal computer when it finished.

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Reasons Your Computer Chairs Break

Sadly, its not uncommon to have computer chairs snap under you. You might not even be that heavy, but chairs just arent made as well these days! Remember back when they were all metal? Those suckers withstood anything. These days, plastic is all youll find in most computer chairs. Overweight people tend to have even more problems since chairs often last only a few weeks before something breaks.

While you can keep using the chair without an arm or even if the back cracks and ends up at a weird angle (yes, this happens to many of us!), once the support column or one of the wheels or base legs goes, youre pretty much hooped. Many people cobble together Frankenchairs, made from a base that still functions with a seat that is still intact, just to save a bit of money. It might seem silly, but if you have computer chairs break on you every couple of months, this is what happens.

So, why do your chairs break? Here are three main reasons:

1. Its not built for weight. Most computer chairs are designed to withstand 150-200 lbs. So, if you weigh anything over that, your chair isnt going to last very long. Thats why you might want to look at computer chairs for overweight people, which can be rated for up to 500 lbs.

2. The material is poorly made. Unfortunately, there arent many high standards in the world of office chairs. Overweight people have discovered that plastic simply isnt designed to withstand much weight . . . it twists and bends and eventually cracks under the stress. These chairs are often stamped out of low cost plastic, which is not sturdy enough.

3. You move too much. When a computer chair is working properly, it will roll smoothly over the floor. However, poorly built chairs cant hold up to the weight. They will sink down, essentially crushing the wheels against the caps and the wheels wont roll. When this happens, you will end up jerking the chair to move it and that puts extra stress on the already fragile joints.

Often its a combination of these three factors that causes a computer chair to give way. You will want to make sure that you choose your chair very carefully. There are a number of designs in computer chairs for overweight people that will hold more and resist more action. Even if you arent obese, choosing a sturdier chair can be a good investment in the long run.

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Its a know fact that Android is an operating system based upon Linux which has a Java programming interface. It offers tools, e.g. a compiler, debugger along with a device emulator combined with particular Java Virtual machine (DVM). Android is made by the Open Handset Alliance which is lead by Google. Android supports 2-D and 3-D graphics utilizing the OpenGL libraries and supports data storage inside a SQLLite database. Google provides for development the Android Development Tools (ADT) for Eclipse to produce Android applications.

Every Android application works in its own process and is isolated from all other running applications. Therefore on misbehaving application cannot harm other Android applications.

If you wish to write programs for Android then according to My online research indicates that the following steps are a good kick off point to to become a master Android programmer:

1. Learn Java.
2. Install the Android Developer Kit, Eclipse, and the Eclipse plug-in for Android programming.
3. Figure out how to use Eclipse with the Android plug-in.
4. Learn how to design Java programs for Android.

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