Biometric

Biometrics is the technology, which uses various individualistic attributes of a person to verify his or her identity. Various attributes include fingerprints, geometrical shapes of hands, retina, and iris in the eyes and so on. Biometric test offers a full-proof and highly secure method of verification to avoid security breech and unauthorized access to critical data and places.

Various Characteristics Involved

The characteristics used by biometrics technology are divided into two groups - physiological and behavioural.

• Physiological characteristics involve face recognition, handprints and fingerprints, veins in hands, capillary vessels in eyes and so on.
• Behavioralcharacteristics involve voice modulations, handwriting and signature style, and keystroke dynamics.
  Salient Features of Biometrics
  • Biometrics makes use of those characteristics, which are universal, that is, found in each and every human being. For instance, fingerprints, voice, face print and so on.
  • Distinct body odours, handwriting skills and other attributes are being included in biometrics analysis, as these characteristics don’t change with growing age of individuals.
  • The characteristics involved in biometrics analysis can’t be stolen or copied. So, you can’t expect anyone to steal your face or eye vessels to use them for illegitimate access.
  • Interestingly, even if someone is able to replicate your fingerprints and use it for biometrics analysis, these systems can instantly differentiate between a human body and a plastic cast, on the basis of body heat, temperature, blood flow and so on.
  
  
  How Does It Work
  
  Biometric devices, like fingerprint scanners and others, store templates of various characteristics of different people. A person is authenticated by matching his or her characteristics with those stored in the template database. Amazingly, these devices based upon biometrics technology are made capable enough to carry out the process of verification in 1-2 seconds, even if the database has thousands of templates stored in it.
  
  Biometrics over Other Tools
  
  Biometrics technology certainly offers alluring advantages over other security tools. While keys and passwords can be replicated or stolen, there is no such possibility in biometrics analysis. Furthermore, the credit cards, ATM cards and other such provisions can’t be misused, when accompanied with biometric test. Sharing of biometrics characteristics is not possible and thus, your trust in a friend or other close person is not victimized.
  Hackers, militants and criminals can be failed in their intentions by employing biometric test at airports, building entrances, banks and other such places. Thus, the technology is growing with leaps and bounds to touch every sphere of life around us.

 

 

Difference between Wifi & Bluetooth

Both Wi-Fi and Bluetooth are wireless technologies that transmit data by using radio signal, the main difference between these two:
 
Wi-Fi is mainly used to provide wireless networking and Internet connection between wireless devices with bigger coverage and high bandwidth (such as wireless network to share Internet connection), whereas Bluetooth is normally used to provide ad-hoc voice/data transfer between mobile devices within short range and low bandwidth (voice transfer between wireless headset and cell phone or data transfer between PDA and laptop).

 

 

 

global Positioning System & Satellite navigation System

GPS stands for Global Positioning System. It was created by the U.S. Department of Defense to allow the military to navigate under any conditions, anywhere in the world. GPS systems available to consumers today use the same satellite signals as the military uses. Consumer GPS devices can offer many significant advantages, but there are a few disadvantages of which you should be aware.          

A satellite navigation or SAT NAV system is a system of satellites that provide autonomous geo-spatial positioning with global coverage. It allows small electronic receivers to determine their location (longitude, latitude, and altitude) to within a few metres using time signals transmitted along a line-of-sight by radio from satellites. Receivers calculate the precise time as well as position, which can be used as a reference for scientific experiments. A satellite navigation system with global coverage may be termed a global navigation satellite system or GNSS.

 

Portable Entertainment Devices Activity

Portable Entertainment Devices Advantages:

1. We can take them anywhere because they are portable
2. We can use them anywhere and anytime we want
3. We can listen to music and watch movies
4. It  may contain a lot of information compared with diskets or tape recording
5. We can record education programs 
6. It can work without electricity and it is easy to handle
7. they have additional devices headphones in order not to distract other people

Portable Entertainment Devices disadvantages:

1. While crossing the street or driving transport facilities it may cause an accident 
2. It may damage your eyes
3. some programs  may be bad for the children and whose under 18 

Mobile phones

Definition

A mobile phone  is a device that can make and receive telephone calls over a radio link whilst moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. By contrast, a cordless telephone is used only within the short range of a single, private base station.

Features

All mobile phones have a number of features in common, but manufacturers also try to differentiate their own products by implementing additional functions to make them more attractive to consumers. This has led to great innovation in mobile phone development over the past 20 years.

The common components found on all phones are:

• A battery, providing the power source for the phone functions.
• An input mechanism to allow the user to interact with the phone. The most common input mechanism is a keypad, but touch screens are also found in some high-end smartphones.
• Basic mobile phone services to allow users to make calls and send text messages.
• All GSM phones use a SIM card to allow an account to be swapped among devices. Some CDMA devices also have a similar card called a R-UIM.
• Individual GSM, WCDMA, iDEN and some satellite phone devices are uniquely identified by an International Mobile Equipment Identity (IMEI) number.

A battery, providing the power source for the phone functions: without the battery the phone can't work because it depends on the power source that is the battery. We charge the battery by a special wire comes with the phone and connect it to the blug for a while to charge and then when the phone finish charging we can use it.