Thursday, 25 October 2012

                                  Buying a Computer System

Teacher:     Desktop
        ASUS ET2300IUTI-B005K 23"...

  • Intel® Core™ i3-3220 processor
  • Genuine Windows® 8
  • Memory: 4 GB
  • Hard drive: 1TB
  • With built-in WiFi
  • £949.99
 
 
 
 
 
News Reporter:Laptop
       
HP Pavilion g6-2230sa 15.6"...      

  • Quad-core AMD A8-4500M processor
  • Genuine Windows®
  •  8Memory: 8 GBHard drive: 750 GB
  • Graphics: AMD Radeon HD 7640G
  • £449.99

 
Website designer:Ipad
 

Apple iPad 2 Wi-Fi 64GB - White.   
. £479.00

    

 
 
 
 
 
 
 
Doctor (in a GP surgery): Desktop
 
 

  • AMD E1-1200 processor
  • Genuine Windows® 8
  • Memory: 4 GB
  • Hard drive: 1TB
  • £529.99
Traffic warden:PDA
 
32 MB - Flash ROM, Touch-screen, 5-way navigation button, STN ( transmissive ), 96 g
. £143
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Bluetooth:
          Bluetooth is a  wireless  technology standard for exchanging data over short distances (using short-wavelength radio transmissions in the ISM band from 2400–2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security.
Memory card:
                A memory card or flash card is an electronic flash memory data storage device used for storing digital information. They are commonly used in many electronic devices, including digital cameras, mobile phones, laptop computers, MP3 players and video game consoles. They are small, re-recordable, and able to retain data without power.
USB port:
     Universal Serial Bus is a power supply between computer and electronic devices such as keyboard,digital cameras and printer.
Alarm:
        An alarm device gives an audible ,visual or other form of  alarm signal about  a problem or condition.
Voice recorder:
   A digital,handheld device that is used to record short reminders.Very lightweight and typically using AAA batteries, such devices use flash memory   to hold up to 100 messages and more.

MMS:
    Multimedia messaging service or MMs is a standard way to send messages that incluide multimedia content to and from mobile phones.
WiFi:
    WiFi is a popular technology that allows an electronic device to exchange wirelessly including high_speed internet connection.
Hands-free device:
       A hands free device is an apparatus used with cell phones that permits the user to talk on the phone without holding it. Through the assistance of this device, the user can let the phone sit in one area while talking into a microphone attached to his or her lapel. Alternatively, it may incorporate a headband that places the microphone in front of the user's mouth. In order to listen to the person on the other end, the user has an earbud speaker placed in one ear.
3G:
     3G refers to the third generation of mobile telephony  technology. The third generation, as the name suggests, follows two earlier generations.
        Third generation wireless service, designed to provide high data speeds, always-on data access, and greater voice capacity. The high data speeds, measured in Mbps, enable full motion video, high-speed internet access and video-conferencing.
TouchScreen:
     A touchscreen is a display that also serves as an input device.Some touchscreens require a proprietary pen for input though most modern touchscreens detect human touch. Since touchscreen devices accept input directly through the screen, they do not require external input devices, such as mice and keyboards. This makes touchscreens ideal for computer kiosks, as well as portable devices, such as smartphones.
GPS:
     GPS stands for Global Positioning System and is a satellite-based radio navigation system that allows land, sea, and airborne users to determine their exact location, velocity, and time 24 hours a day, in all weather conditions, anywhere in the world. The capabilities of today’s system render other well-known navigation and positioning “technologies”—namely the magnetic compass, the sextant, the chronometer, and radio-based devices—impractical and obsolete. GPS is used to support a broad range of military, commercial, and consumer applications.
Video calling:
       A visual communication between two people such as skype,yahoo etc.
Email:
      Elextronic also known as email or e-mail , is a method of exchanging digital messages from an author to one or more recipients.
Internet:
    The Internet is a global network  connecting millions of computers. More than 100 countries are linked into exchanges of data, news and opinions.
SMS:

     Abbreviated as SMS, the transmission of short text messages to and from a mobile phone, fax machine and/or IP address. Messages must be no longer than 160 alpha-numeric characters and contain no images or graphics.
Radio:
       Radio is the transmission of signals through free space by electromagnetic waves with frequencies significantly below visible light, in the radio frequency range, from about 3 kHz to 300 GHz.
Calculator:
       An electronic calculator is a small, portable, often inexpensive electronic device used to perform both basic and complex operations of arithmetic.
Camera:
     A camera is a device that records images that can be stored directly, transmitted to another location, or both. These images may be still photographs or moving images such as videos or movies.
Internet:
     The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents of the World Wide Web (WWW) and the infrastructure to support email.
Personal organiser:
      A personal organizer, day planner, personal analog assistant, personal planner or year planner is a small book or binder that is designed to be portable. It usually contains a diary, calendar, addressbook,blank paper and other sections.
A personal organizer may also include pages with useful information, such as maps and telephone codes. It is related to the separate desktop stationery items that have one or more of the same functions, such as appointment calendars, rolodexes, notebooks, and almanacs.
Games:
       A game is structured playing, usually undertaken for enjoymen and sometimes used as an educational tool. Games are distinct from work, which is usually carried out for remuneration, and from art, which is more often an expression of aesthetic or ideological elements. However, the distinction is not clear-cut, and many games are also considered to be work (such as professional players of spectator sports/games) or art (such as jigsaw puzzles or games involving an artistic layout such as Mahjong, solitaire, or some video games).
Roaming:
         In wireless telecommunications, roaming is a general term referring to the extension of connectivity service in a location that is different from the home location where the service was registered. Roaming ensures that the wireless device is kept connected to the network, without losing the connection.
 Camcorder:
         A camcorder (formally a video camera recorder) is an electronic device that combines a video camera and a video recorder into one unit; typically for out-of-studio consumer video recording. Equipment manufacturers do not seem to have strict guidelines for the term usage; for instance marketing materials may present the device by its colloquial term camcorder, while full name on the package and manual is often video camera recorder
MP3 player:
         A digital music player that supports the MP3 audio format, which started a revolution in online music downloads and distribution (see MP3). All portable music players, the iPod being the leading brand, support MP3 along with one or more other audio formats. CD players, whether shelf units or portable, may also play back MP3 files. For more details, see digital music player and iPod. See MP3, audioblog, podcast, codec examples and peer-to-peer network.
Predictive Text:
          Predictive text is an input technology used where one key or button represents many letters, such as on mobile phones and in accessibility technologies. Each key press results in a prediction rather than repeatedly sequencing through the same group of "letters" it represents, in the same, invariable order. Predictive text could allow for an entire word to be input by single keypress. Predictive text makes efficient use of fewer device keys to input writing into a text message, an e-mail, an address book, a calendar, and the like.
voice recorder:
A digital, handheld device that is used to record short reminders. Very lightweight and typically using AAA batteries, such devices use flash memory to hold up to 100 messages and more. Messages can be retrieved sequentially or by direct access by message number. See microcassette.






                                                        Designing Mobile Phone

Mobile phone battery:


                   Modern mobile phones and smartphones are much more powerful devices than their predecessors and require a lot of power to run.
         This inevitably places high demands on the mobile phone's battery, and some smartphones are notorious for running out of battery power after barely a day's use.

What is a mobile phone battery?

Most modern mobile and smartphone batteries are Lithium-ion batteries, or LIBs.
This form of battery is favoured in consumer electronic devices, particularly portable ones, due to its energy-to-weight ratio.
      They're particularly good for mobile phones as they have no memory effect, meaning that they don't lose large amounts of their maximum charge capacity, like some nickel cadmium batteries.
  1. surfing the internet
  2. watching internet tv
  3. using the GPS when meeting friends
  4. talkig to friends
  5. sending text messages
  6. taking photos
  7. using the calculator to keep tabs on her finance                                                                  
                                                               Mobile phone designs
           The design and user interface of a device is extremely important to consider.Mobile phone manufacturers have to take into account all of thier users and try to meet thier needs.This is why there are  are many different types of phones available.
There are different phones available for different purposes.
1.Fashion phones:
            The mobile phone has moved away from being just a tool of communication. It’s become a style statement that allows individuals to define themselves by extending their "fashionable" personality. The trend, at least for those who can afford them, is to have a phone that may not necessarily be feature-rich but which boosts one's ego when flaunted. The mobile phone that's increasingly making a statement as a fashion accessory.
       These can be different shapes and have the ability to be customized,e.g.change the fascias.Buttons may be in odd places and may be inconvenient to use.They can be bright colours and highly designed,appealing to the fashion-conscious person.
      Features often include high-spec cameras,the ability to store large amounts of data like photos and videos, and speakers that allow music to be played out loud.The batteries are designed to last longer but can be bulky,often making the phone larger.
2.Business phones:
     The business phones are slim,sleek design,usually in black or metallic colours.They have large screens and an integrated,full qwerty keyboard.
      Business phones often include speaker phone,voice activated dialling,the ability to synchronise it with other devices like netbooks and laptops etc.They also include large screens to enable work on data files,GPS to get the user to unfamiliar destinations with camera,personal digital assistant(PDA),and 3G compatibility for internet access... allowing users to carry one device rather than many.
Multifunctional phones:
      Multifunctional phones are those that combine both style and business features.They have the best of both worlds e.g: high-spec features, large amounts of storage,high-speed processing, slim design with touch screens and access to the internet.











Friday, 12 October 2012

Types of Computer

                                                              TYPES OF COMPUTER
                                                                    

There are three different types of computers according to the principles of operation. Those three types of computers are
Computer:
  1. Analog computers
  2.  Digital computers
  3.  Hybrid computers                                        
1. Analog computers:
             Analog Computer is a computing device that works on continuous range of values. The results given by the analog computers will only be approximate since they deal with quantities that vary continuously. It generally deals with physical variables such as voltage, pressure, temperature, speed, etc.
2.Digital computer:
             With these types of computers operation are on electrical input that can attain two inputs, states of ON=1 and state of OFF = 0. With digital type of computers data is represented by digital of 0 and 1 or off state and on state. Digital computer type recognizes data by counting discrete signal of (0 0r 1), they are high speed programmable; they compute values and stores results. After looking at the Digital computer type and how it functions will move to the third computer type as mentioned above.
3.Hybrid computers:
                A hybrid computer combines the desirable features of analog and digital computers. It is mostly used for automatic operations of complicated physical processes and machines. Now-a-days analog-to-digital and digital-to-analog converters are used for transforming the data into suitable form for either type of computation.
Digital computer:

    1. mini computer
    2. micro computer
    3. super computer
                                                            Mini computers
    Deskktop computers: A desktop computer is a personal computer (PC) in a form intended for regular use at a single location, as opposed to a mobile laptop or portable computer. Early desktop computers are designed to lay flat on the desk, while modern towers stand upright. Most modern desktop computers have separate screens and keyboards.






    Laptop:
             Portable and compact personal computer with the same capabilities as a desktop computer. Laptop computers have an L-shape design and the screen can be lowered and closed to allow for easy transportation of the machine. The primary feature that attracts users to laptops over desktops is their portability. Laptop computers provide users the ability to run the machine using an internal battery or an outside power adaptor. Laptops have dramatically decreased in size since their introduction in 1979. Laptops are usually more expensive than standard desktops and do not have the same life-span as fixed personal computers.


    Notebook:
         A notebook computer is a battery- or AC-powered personal computer generally smaller than a briefcase that can easily be transported and conveniently used in temporary spaces such as on airplanes, in libraries, temporary offices, and at meetings.









    Netbook:
                   Netbook computers are small portable computers with limited capabilities as compared to standard PC notebooks. Their small size and low weight allows them to be easily transported. However, their limited capabilities on storage and computing power restrict the user to certain applications and functions.




        

    Personal digital assistant(PDA):
    Powerful handheld computing device without a keyboard, but with a screen that reads the words written (drawn) on it with a pen -like stylus. Most PDAs (like the Palm Pilot) have built-in (or accessible through attachable modules) capabilities to take notes, write letters, keep records, perform spreadsheetfunctions, read bar codes, connect to internet and other networks to download and upload data, and synchronize its data with data in a desktop computer. Wireless PDAs can connect to remote computers or databases within the range.



    IPAD:
                   The iPad is a tablet computer developed by Apple. It is smaller than a typical laptop, but significantly larger than the average smartphone. The iPad does not include a keyboard or a trackpad, but instead has a touchscreen interface, which is used to control the device.