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3 Δεκ 2013 (πριν από 3 χρόνια και 8 μήνες)

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1.0 Introduction

Described in its simplest form, a computer takes information (or inputs),
processes it according to a set of instructions (a program), and gives back a result (or
output). In this respect, it is very similar to a calculator, but obviously

somewhat more
complex.

The other key characteristic of a computer is that it is a multi
-
function platform.
The same machine can perform many different tasks by using different programs. A
computer is an electronic device that manipulates information or "d
ata." It has the ability
to store, retrieve, and process data. You can use a computer to type documents, send
email, and surf the Internet. You can also use it to handle spreadsheets, accounting,
database management, presentations, games, and more. Whether

you realize it or not,
computers play an important role in our lives. When you withdraw cash from an ATM,
scan groceries at the store, or use a calculator, you're using a type of computer.


1.1
Computers in Education

Computers have many applications in ed
ucation. They can act as a resource for
students or teachers as they facilitate access to relevant information on the Internet and
on CD
-
ROM/DVD/Memory Stick/mp3 players, Mobile Phones etc. They allow students
and teachers to prepare presentations, documen
ts, images and so on. Furthermore,
there are specific educational programs, usually containing multimedia and animation,
which are designed to teach or support learning in specific subject areas. In fact, the
ways in which computers are integrated depends
entirely on the imagination of both
teachers and students.

Computer literacy is becoming a vital skill for all as we move
further into this information age. Everyone involved in education has much to gain from
the increased productivity that these machines

can offer.


1.2
Types of computers

Computers range in size and capability. At one end of the scale
are

supercomputers
, very large computers with thousands of linked microprocessors
that perform extremely complex calculations. At the other end are tiny computers
embedded in cars, TVs, stereo systems, calculators, and appliances. These computers

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are built to perform a limi
ted number of tasks.

The

personal computer
, or

PC
, is
designed to be used by one person at a time. This section describes the various kinds
of personal computers: desktops, laptops, handheld computers, and Tablet PCs.


1.2.1
Desktop computers

Desktop compu
ters

are designed for use at a desk or table. They are typically
larger and more powerful than other types of personal computers. Desktop computers
are made up of separate components. The main component, called the

system unit
, is
usually a rectangular cas
e that sits on or underneath a desk. Other components, such
as the monitor, mouse, and keyboard, connect to the system unit.



1.2.2 Laptop computers

Laptop computers

are lightweight mobile PCs with a thin screen. They are often
called
notebook computers

because of their small size. Laptops can operate on
batteries, so you can take them anywhere. Unlike desktops, laptops combine the CPU,
screen, and keyboard in a single case. The screen folds down onto the keyboard when
not in use.





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1.2.3 Handheld
computers

Handheld computers
, also called

personal digital assistants (PDAs)
, are battery
-
powered computers small enough to carry almost anywhere. Although not as powerful
as desktops or laptops, handhelds are useful for scheduling appointments, storing
ad
dresses and phone numbers, and playing games. Some have more advanced
capabilities, such as making telephone calls or accessing the Internet. Instead of
keyboards, handhelds have touch screens that you use with your finger or a

stylus

(a
pen
-
shaped pointin
g tool).



1.2.4 Tablet PCs

Tablet PCs

are mobile PCs that combine features of laptops and handhelds. Like
laptops, they're powerful and have a built
-
in screen. Like handhelds, they allow you to
write notes or draw pictures on the screen, usually with a t
ablet pen instead of a stylus.
They can also convert your handwriting into typed text. Some Tablet PCs are
“convertibles” with a screen that swivels and unfolds to reveal a keyboard underneath.












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2.0 Types of Laptops

1.


Laptop Brand


: HP

Name



: HP EliteBook 2540p Notebook




HP EliteBook 2540p Notebook PC

Operating system installed


Genuine

Windows® 7 Professional 32


Genuine

Windows® 7 Professional 64


Genuine

Windows® 7 Home Premium 32


Genuine

Windows® 7 Home Premium 64


Genuine

Windows® 7 Home Basic 32


Genuine

Windows Vista® Business 32


Genuine

Windows Vista® Home Basic 32


FreeDOS

System may require upgraded and/or separately
purchased hardware and/or a DVD drive to install
the Windows 7 software and take full advantage of
W
indows 7 functionality; Certain Windows Vista
product features require advanced or additional
hardware

Processor family


Intel® Core™ i7 Processors


Intel® Core™ i5 Processors


Intel® Core™ i7 Processors
-

Low Voltage

Maximum memory


Upgradeable to 8 GB

Internal drives


SATA II (7200 rpm)

From: 250 GB

Up to: 500 GB

SATA II (5400 rpm)


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2.











Laptop Brand


: Acer

Name



: Aspire TimelineX 4820T


Operating System



Genuine

Windows
®

7 Home Premium



Genuine

Windows
®

7 Home Basic

Processor & Chipset



Intel® Core™ i7
-
620M processor (4 MB L3 cache, 2.66 GHz with
Turbo Boost up to 3.33 GHz, DDR3 1066 MHz, 35 W),

supporting
Intel® 64 architecture, Intel® Smart Cache



Intel® Core i5
-
430M/i5
-
520M/i5
-
540M processor (3 MB L3 cache,
From: 160 GB

Up to: 320 GB

Solid State Drive

From: 80 GB

Up to: 160 GB

Display size (diagonal)


12.1"

Graphics


Intel® HD Graphics

Energy efficiency compliance


ENERGY
STAR® qualified configurations available

Product weight


Starting at 1.53 kg




P
rice RM$ 6,499




6


2.26/2.40/2.53 GHz with Turbo Boost up to 2.53/2.93/3.06 GHz, DDR3
1066 MHz, 35 W), supporting Intel® 64 architecture, Intel® Smart
Cache



I
ntel® Core i3
-
330M/i3
-
350M processor (3 MB L3 cache, 2.13/2.26
GHz, DDR3 1066 MHz, 35 W), supporting Intel® 64 architecture,
Intel® Smart Cache



Mobile Intel® HM55 Express Chipset

Memory



Dual
-
channel DDR3 SDRAM support



Up to 4 GB of DDR3 1066 MHz memory,
upgradeable to 8 GB using
two soDIMM modules for (for 64
-
bit OS)

Storage



160/250/320/500/640 GB or larger hard disk drive



Multi
-
in
-
1 card reader, supporting Secure Digital™ (SD),
MultiMediaCard (MMC), Memory Stick® (MS), Memory Stick PRO™
(MS PRO), xD
-
Pic
ture Card™ (xD)

Display



14" HD 1366 x 768 pixel resolution, high
-
brightness (200
-
nit) Acer
CineCrystal™ LED
-
backlit TFT LCD, supporting simultaneous multi
-
window viewing



Mercury free, environment friendly



16:9 aspect ratio



Super
-
slim design

Graphics



Intel® HD Graphics with 128 MB of dedicated system memory,
supporting Microsoft® DirectX® 10(* depending on size of system
memory)



ATI Mobility Radeon™ HD 5650 with Switchable™ Graphics
technology, up to 40915 MB of HyperMemory™ (1024 MB of
dedicated DDR3
VRAM, up to 30676 MB of shared system memory),
supporting Unified Video Decoder (UVD), OpenEXR High Dynamic
-
Range (HDR) technology, Shader Model 5.0, Microsoft® DirectX® 11,
OpenGL® 3.1, OpenCL™ 1.1 (* depending on size of system
memory)



ATI Mobility Radeo
n™ HD 5470 with Switchable™ Graphics
technology, up to 35795 MB of HyperMemory™ (512 MB of dedicated
DDR3 VRAM, up to 30676 MB of shared system memory), supporting
Unified Video Decoder (UVD), OpenEXR High Dynamic
-
Range (HDR)
technology, Shader Model 5.0,
Microsoft® DirectX® 11, OpenGL®
3.1, OpenCL™ 1.1



Dual independent display support



16.7 million colors



MPEG
-
2/DVD decoding



VC
-
1 and H.264 (AVC) decoding



Microsoft® DirectX® Video Acceleration (DXVA) application interface
(API)



HDMI™ (High
-
Definition
Multimedia Interface) with HDCP (High
-
bandwidth Digital Content Protection) support

Power Supply & Battery



ACPI 3.0 CPU power management standard: supports Standby and
Hibernation power
-
saving modes



66.6 W 6000 mAh 6
-
cell Li
-
ion standard battery pack:



up to 8
-
hour battery life



90W 9000 mAh 9
-
cell Li
-
ion standard battery pack


• up to 12
-
hour battery life



3
-
pin 90 W AC adapter(for discrete model only)



Acer PowerSmart 3
-
pin 65 W AC adapter(for UMA model only)


7




65 W AC adapter



Energy Star®

Keyboard &
Special Controls



86
-
/87
-
/91
-
key keyboard, with inverted "T" cursor layout



Multi
-
gesture touchpad pointing device, supporting:


• Circular
-
motion scrolling


• Pinch
-
action zoom


• Page flip



10 function keys, four cursor keys, two Windows® keys, hotkey
controls, embedded numeric keypad, international language support



Acer Programming key



Media control keys (printed on keyboard): play/pause, stop, previous,
next

Weight & Dimensions



342 (W) x 245 (D) x 24/25.4 (H) mm (13.46 x 9.64 x 0.94/0.99 inches)



2.2
kg (4.85 lbs.) with 6
-
cell battery

Options



Acer Media Center remote control



1 GB / 2 GB/4GB DDR3 1066 MHz soDIMM module



3
-
pin 90 W AC adapter



External USB floppy disk drive



External USB Lite+LSI modem


3.



8


Laptop Brand


:
Sony Vaio

Name



:
Vaio
S
-
series


Model

VPC
-
S115FG/G/P/B

Operating System


Operating System

Genuine Windows® 7 Home Premium 64
-
bit (English Version)

Language Pack

Hong Kong Chinese, Simplified Chinese, Arabic, Thai

Processor Name

Intel® Core™ i3
-
330M Processor 2.13 GHz*1

Chipset

Intel® HM55 Express Chipset

Processor System Bus

1066 MHz

Cache Memory

3 MB (L3 Cache)

Main Memory


Pre
-
installed/Max

4 GB DDR3 SDRAM*2 (upgradeable up to 8 GB*3)

SO
-
DIMM Slots

2 SO
-
DIMM slots (The pre
-
installed memory module uses two)

Hard
Disk Drive


Flash Memory

320 GB*4 (Serial ATA, 5400 rpm)

Graphics Accelerator

NVIDIA® GeForce® 310M GPU with CUDA™ Technology

Dedicated Video
Memory

512 MB DDR3 SDRAM

Display


Type

13.3" wide (WXGA: 1366 x 768) TFT colour display (VAIO Display, LED
backlight)

Interface


USB

High Speed USB 2.0 x 3

Camera


Front Side Camera

Effective pixels: 640 x 480

Audio


Sound Chip

Intel® High Definition Audio compatible , 3D audio (Direct Sound 3D support)

Speaker

Built
-
in stereo speakers

Microphone

Built
-
in monaural microphone

Keyboard



9


Keyboard

Approx. 19 mm key pitch / 1.7 mm keystroke , 86 keys , Backlit Keyboard

Touchpad

Intelligent Touchpad

Battery Life*8


Bundled Battery

VGP
-
BPS21A Lithium
-
ion battery: up to 3 hours of use

Optional Long
Battery

VGP
-
BPL21 Lithium
-
ion battery: up to 4.5 hours of use

Size


Dimensions (WxHxD)

329 x 27.6
-

31.5 x 228.5 mm

Weight

2.0 kg (including the supplied battery)


4.


Laptop Brand


:
Dell

Name



:
Dell Studio XPS 16


Processor



Intel
®

Core
TM

i7 840QM

(1.86GHz/8MB

cache)


10




Intel
®

Core
TM

i7 740QM

(1.73GHz/6MB

cache)



Intel
®

Core
TM

i7 720QM

(1.6GHz/6MB

cache)



Intel
®

Core
TM

i5 540M

(2.53GHz/3MB

cache)



Intel
®

Core
TM

i5 460M

(2.53GHz/3MB

cache)



Intel
®

Core
TM

i5 520M

(2.4GHz/3MB

cache)

Operating System



Genuine

Windows
®

7 Ultimate 64
-
Bit



Genuine

W
indows
®

7 Professional 64
-
Bit



Genuine

Windows
®

7 Home Premium 64
-
Bit

Memory



4GB Shared Dual Channel DDR3 at 1333MHz



6GB Shared Dual Channel DDR3 at 1333MHz



8GB Shared Dual Channel DDR3 at 1333MHz

Video Card



ATI HD5730 Mobility Radeon
TM

Display




o

15.6 inch display
(1920x1080)

o

15.6 inch display (1680x945)

o

15.6 inch display (1600x900)

Hard Drive



Up to 640GB
3

SATA hard drive

(5400RPM)



Up to 500GB
3

SATA hard

drive

(7200RPM)



Up to 256GB
3

Solid Sta
te hard drive

Dimensions & Weight


Width: 15.15" (384.9mm)


Height: 0.95" (24.1mm) front / 1.34" (33.95mm) back


Depth: 10.02" (254.6mm)


Weight: Starting weight of 6.3 lbs. (2.87 kg)*(15.6" WLED display 6 cell battery). Weights will
vary depending on conf
igurations and manufacturing variability.


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5.


Laptop Brand


:
Apple

Name



:
Apple Macbook Pro


Processor

2.4GHz Intel
Core i5

Memory

4GB (two 2GB SO
-
DIMMs) of 1066MHz DDR3 SDRAM;

Hard drive
6

320GB Serial ATA; 5400
rpm






Slot
-
loading optical
drive

8x SuperDrive (DVD±R DL/DVD±RW/CD
-
RW)






Graphics

Intel HD Graphics
5

and NVIDIA GeForce GT 330M with automatic graphics switching






Video

iSight camera; Mini DisplayPort output port with support for DVI







12


Display

15.4
-
inch (diagonal)
LED
-
backlit glossy widescreen display, 1440
-
by
-
900 resolution






Expansion

One FireWire 800 port (up to 800 Mbps), two USB 2.0 ports (up to 480 Mbps
)






Audio

Stereo speakers with subwoofers, omnidirectional microphone
.






Networking

10/100/1000BASE
-
T (Gigabit) Ethernet






Wireless

AirPort Extreme Wi
-
Fi (based on IEEE 802.11n specification)






Hardware accessories

85W MagSafe Power Adapter, AC wall plug, power cord








3.0 Conclusion

Surely computers have very elaborated role in daily day life of humans. The
biggest proof is present at our surroundings. Just having a look around at our

s
urroundings will be enough to prove the involvement of computers in everyday lives.
Shopping, banki
ng, traveling, stocking, literature, entertainment, public sector, private
sector, almost everywhere computers are playing their roles efficiently. Computers can
be designated as one of the most creative innovations of human beings. In coming days
computer
s are even going to be more pervasive, because technology is getting
advanced day by day.