Advantages and disadvantages of biometric systems:


Disadvantages of a biometric system.

• 
  
• -The finger print of those people working in Chemical industries are often affected. Therefore these companies should not use the finger print mode of authentication.
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• -It is found that with age, the voice of a person differs. Also when the person has flu or throat infection the voice changes or if there there are too much noise in the environment this method maynot authenticate correctly. Therefore this method of verification is not workable all the time
• 
  
• -For people affected with diabetes, the eyes get affected resulting in differences.
• Biometrics is an expensive security solution.

Advantages of Biometrics : 

*  Increase security - Provide a convenient and low-cost additional tier of security.

* Reduce fraud by employing hard-to-forge technologies and materials. For e.g.Minimise the opportunity for ID fraud, buddy     punching. 

* Eliminate problems caused by lost IDs or forgotten passwords by using physiological attributes. For e.g. Prevent   unauthorised use of lost, stolen or "borrowed" ID cards. 

*  Reduce password administration costs. 

*  Replace hard-to-remember passwords which may be shared or observed. 

Biometrics:

Biometrics is the automated method of recognizing a person based on a physiological or behavioral characteristic. Biometric technologies are becoming the foundation of an extensive array of highly secure identification and personal verification solutions.

What are the main types of biometric systems?

The main physical biometric technologies include:

• fingerprint
• iris
• retina
• hand
• palm vein
• face

  When we recently heard that purveyor of luxury men's goods Alfred Dunhill was selling a secure

biometric  wallet, we were intrigued: who wouldn't want a carbon fiber billfold that only opened with your fingerprint, and alerted you when it lost Bluetooth contact with your cellphone? Cost to the consumer: $700. Sounded like a pretty good deal, at least until we were hepped to a little something called the iWallet.

A high-tech sensor technology that can identify an individual by sensing the unique electronic signals generated by their brain waves, beating heart or breathing patterns. According to the press release from Idesia, the Biodynamic Signature (BDS) sensor is smaller and more durable than normal fingerprint readers, not to mention more reliable and cheaper to manufacture.

Those simpler sensors have made inroads into the manufacturing plant environment, and for good reason. Magnetic cards or PINs that grant employee access to off-limits areas or files, or monitor time cards/attendance etc. are vulnerable to social engineering tricks as new as password hacking and as old as one of the oldest tricks in the book, the “buddy system” for punching factory timecards.

Personal Digital Assistant (PDA)

The main purpose of a personal digital assistant (PDA) is to act as an electronic organizer or day planner that is portable, easy to use and­ capable of sharing information with your PC. It's supposed to be an extension of the PC, not a replacement.

PDAs, also called handhelds or palmtops, have definitely evolved over the years. Not only can they manage your personal information, such as contacts, appointments, and to-do lists, today's devices can also connect to the Internet, act as global positioning system (GPS) devices, and run multimedia software. What's more, manufacturers have combined PDAs with cell phones, multimedia players and other electronic gadgetry.

Advantages:
1. Organize daily schedules.
2. Take notes.
3. Record voice memos and lectures.
4. Write and rehearse PowerPoint presentations.
5. Collect audit data.
6. compile logbooks in clinics/theatre.
7. view journal articles and movies.


Disadvantages:


1. Fragile and Delicate.
2. Need to constantly recharge - must travel with recharging cord or cradle.
3. Most PDAs have incompatible formats for transferring information between unlike brands.
4.Limited video playback capability - no Flash support.
5.Cameras don't zoom or have flash.

Portable entertainment devices such as mp3 or dvd-players, which allow people to listen to music or watch films, are now commonplace, what do you think are the main advantages and disadvantages of this development?

Nowadays everyone is relying on technology in every way, including entertainment. I personally rely on technology in entertainment more than anything else and find it very amusing to use.

The advantages I find in portable devices are:

+  They can be carried anywhere. 

+ They carry many than one facilities (ex: The Ipod – Listening to music, storing photos, recording vocal thoughts, playing movies, change the channel on the TV - Using Griffin's TotalRemote software and IR device-  downloading applications (in the case of Ipod touch) and many other uses. 

  +A good way for passing time during a long journey (In airplanes – cars – train ect..) . 

    + Gaming, using devices such as PSP and Nintendo DS. 

+ Some games help in developing the brain as they need thinking  using the brain. 

+ The ability to share your results with friends and compete with them (Using the portable gaming devices). 

+ The ability to connect the device with a wireless connection which enables you to brows different websites from the internet. (Youtube, twitter, google…ect) 

+ Saving documents. 

+ Reading the latest books online using the e-book facility (Though Ipad and Itouch).

  

   The disadvantages I find in portable devices a

_They cause many health problems such as the eyesight problems and hearing problems.

_ People don’t realize how much time they spend on such devices.

_ Causes isolation: Where people have strong relationships online rather than having them in real life.

 _ the quality of the non-portable device is better.

_Not everyone can afford purchasing them.

_ Viruses could cause damage and loss of documents.

_  You need to charge the device and the charge finishes  in a few hours.

 

Mobile Phones.

What are mobile phones?

An electronic telecommunications device, often referred to as a cellular phone or cellphone. Mobile phones connect to a wireless communications network through radio wave or satellite transmissions. Most mobile phones provide voice communications, Short Message Service (SMS), Multimedia Message Service (MMS),  and newer phones may also provide Internet services such as Web browsing and e-mail. 

How do mobile phones work? Mobile phones work using "cells". Each cell has a base station at its centre. The base station sends and recieves calls from your phone. Your phone communicates with the base station using radio waves.As your phone moves from cell to cell, your calls are transmitted from the nearest base station.
Advantages of mobile phones:

1) Can carry everywhere
2) Contact with others easily (convenient)
4) Have a lot of functions e.g. take photos,
listen to music….
5) Use it when you are bored
6) Have different styles and colours
7) 3G service

Disadvantages of mobile phones:
1) People spend less time gathering with their
family
2) Disturb our study and people’s work
3) Easily broken
4) affect our health because there are rays
5)some places cannot have service


Mobile phones and health:

A major study into the safety of mobile phones has concluded that they may affect the health of people who use them.

Research carried out by scientists in Finland suggests radiation from mobile phones causes changes in the brain.

It is the first time that scientists have looked at the effects of mobile phone radiation on human cells rather than those of rats. The two-year study concluded that even low-level emissions from handsets are damaging.

Scientists from the Radiation and Nuclear Safety Authority found that exposing human cells to mobile phone radiation damaged the blood-brain barrier - a safety barrier in the body that stops harmful substances in blood from entering the brain.They discovered that the exposure caused the cells in blood vessel walls to shrink which enabled molecules to pass into brain tissue.