Database

A database is an organised collection of structured data. Database software enables you to organise and store data so that specific items of information can be retrieved easily and quickly in a structured fashion. A database file contains one or more tables. A table is a collection of related data about a subject (person, place or thing) and is divided into rows and columns. Each row is a record and each column is a field. A record is a group of related fields. A field is a data item within a record. Each record has a key field (primary field) which uniquely identifies a record. Using a key field can speed up operations such as searching and sorting. A key field also allows tables to be linked. Linking tables enables a database to create queries that retrieve data from several tables. A flat-file database has only one table, whereas a relational database has several linked tables. An index is a table that contains two columns: one column stores a sorted list of the values in the field or fields being indexed and the second stores a pointer, which gives the location of each record in the table. The key field is always indexed and you can choose to index other fields. Indexes can speed up operations such as queries. Each field is automatically assigned default field properties depending on the data type. The field properties, which can be changed, determine how a field is stored, how it works and how it is displayed. 

Biometrics

                                Biometrics

Biometrics is the science and technology of measuring and analyzing biological data. In information technology, biometrics refers to technologies that measure and analyze human body characteristics, such as DNA, fingerprints, eye retinas and irises, voice patterns, facial patterns and hand measurements, for authentication purposes.

Authentication by biometric verification is becoming increasingly common in corporate and public security systems, consumer electronics and point of sale (POS) applications. In addition to security, the driving force behind biometric verification has been convenience.

Biometric devices, such as finger scanners, consist of:

• A reader or scanning device.

• Software that converts the scanned information into digital form and compares match points .

• A database that stores the biometric data for comparison.

 

Bluetooth VS. WiFi

What is the difference between Bluetooth & Wi-Fi???

Both are wireless, but their typical uses are totally different.

Bluetooth:)
Bluetooth typically operates on a weaker signal than wi-fi making it useful for close proximity connections such as wireless headsets or sending a picture between your phone and your computer.

Wi-Fi :)
Wi-fi on the other hand operates at a stronger signal and the data transfer rate is higher making it more suitable for wider range use such as local/home networks and internet sharing.

 

Satellite Navigation System

                Satellite Navigation System

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.

 

Global Positioning System (GPS)

Global Positioning System (GPS)

The Global Positioning System (GPS) is a space-based satellite navigation system that provides location and time information in all weather, anywhere on or near the Earth, where there is an unobstructed line of sight to four or more GPS satellites. It is maintained by the United States government and is freely accessible to anyone with a GPS receiver.


The GPS program provides critical capabilities to military, civil and commercial users around the world. In addition, GPS is the backbone for modernizing the global air traffic system.

 

the GPS can be used in phones, cars and many other things.

  


 

Portable Entertainment Devices

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 facility.

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

+ 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)

+ 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

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.
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:
Some featues of mobile phones

• Roaming: which permits the same phone to be used in multiple countries, providing that the operators of both countries have a roaming agreement.
• Send and receive data and faxes: (if a computer is attached), access WAP services, and provide full Internet access using technologies such as GPRS.
• applications like a clock, alarm, calendar and calculator and a few games.
• Sending and receiving pictures and videos through MMS, and for short distances with e.g. Bluetooth.
• GPS receivers integrated or connected (i.e. using Bluetooth) to cell phones, primarily to aid in dispatching emergency responders and road tow truck services. This feature is generally referred to as E911.
• Push to talk, available on some mobile phones, is a feature that allows the user to be heard only while the talk button is held, similar to a walkie-talkie.

Bluetooth:
Bluetooth is wireless connectivity. In other words, it is a way of connecting mobile phones to other mobiles phones and devices without wires. Using radio waves similar to a remote control toy, Bluetooth has a range of up to 50 metres depending on the particular Bluetooth device and the prevailing conditions.
Typical examples are connecting a Bluetooth headset or car kit to your Bluetooth mobile phone. Simply jump in the car, switch on the ignition and your Bluetooth mobile phone will automatically connect to the Bluetooth car kit with not a wire in sight - simple, quick and very convenient.

Refrences:
http://en.wikipedia.org/wiki/Mobile_phone
http://en.wikipedia.org/wiki/Mobile_phone_features
http://www.mobiles.co.uk/bluetooth-mobile-phones.html