Friday, 22 April 2011

Mobile computing


1.0            Introduction

         A computer network is a group of interconnected computers. Networks may be classified according to a wide variety of characteristics. This article provides a general overview of some types and categories and also presents the basic components of a network. Computer network is a collection of computers and devices connected to each other. The network allows computers to communicate with each other and share resources and information. The Advanced Research Projects Agency (ARPA) designed "Advanced Research Projects Agency Network" (ARPANET) for the United States Department of Defense. It was the first computer network in the world in late 1960s and early 1970s.
Communication is the process of transferring information from one source to another. Communication is commonly defined as "the imparting or interchange of thoughts, opinions, or information by speech, writing, or signs. Communication can be perceived as a two-way process in which there is an exchange and progression of thoughts, feelings or ideas towards a mutually accepted goal or direction. Communication as an academic discipline has a long history. Communication is a process where by information is encoded and imparted by a sender to a receiver via a channel/medium. The receiver then decodes the message and gives the sender a feedback. Communication requires that all parties have an area of communicative commonality. There are auditory means, such as speaking, singing and sometimes tone of voice, and nonverbal, physical means, such as body language, sign language, paralanguage, touch, eye contact, by using writing.
2.0            Mobile Computing
2.1       Definition
Mobile Computing is a generic term describing your ability to use technology 'untethered', that is not physically connected, or in remote or mobile (non static) environments. The term is evolved in modern usage such that it requires that the mobile computing activity be connected wirelessly to and through the internet or to and through a private network. This connection ties the mobile device to centrally located information and/or application software through the use of battery powered, portable, and wireless computing and communication devices.
This includes devices like laptops with wireless LAN or wireless WAN technology, smart mobile phones, wearable computers and Personal Digital Assistant (PDAs) with Bluetooth or IRDA interfaces. Mobile computing also defined as generic term describing one's ability to use technology while moving as opposed to portable computers, which are only practical for use while deployed in a stationary configuration.
            2.2       Specification, services, and frequencies of Mobile Computing
PDA Phones-BlackBerry Bold
Specification
This PDA phone is priced reasonable, this awesome mobile device is absolutely fantastic to watch. Expensive looks, futuristic design and most of all, loaded with all kinds of possible state of art technologies. Slim and ultra-elegant, this mobile handset is an eye-catcher at the first glance. Large display screen with QWERTY keyboard and the trackball navigation features make it an extraordinary mobile phone. The BlackBerry Bold also comes with huge memory space that allows you to store unlimited number of video and music files. There is also a 2.0 megapixels camera that can help you to make a photo-trail of the magical moments that you spent with your near and dear ones .This phones weight is 133 g. The standby time of the battery is on the higher side (approximately 310 hours), so without worrying enjoy the companionship of this mobile phone for longer time. The ringtones in this phone is in polyphonic and MP3. Color and clarity come to life. The screen of the BlackBerry Bold smartphone catches the eye and is designed to deliver color and clarity that exceed expectations. From the moment you turn it on, you’ll be blown away by explicit color and quality. This phone also have 3G technology and HSPDA capability up to 3.6 Mbps.
Services
There are many services that this phone have. We can call, sending SMS and MMS using this phone. One of the services is GPS and BlackBerry Maps. You can know where you stand. With built-in GPS capabilities, and BlackBerry® Maps, you get turn-by-turn directions, so you can pinpoint where you are right now and where you need to be.1,4 Learn more about finding your way. This phone also have Wi-Fi. It is simple and straightforward. Lower your cellular costs and get service in areas where cellular network coverage may be limited or unavailable, with BlackBerry data services over Wi-Fi® networks. Besides that, this phone also have Mobile Streaming. The built-in mobile streaming capabilities on the BlackBerry Bold smart phone are designed so that you can watch online videos or listen to streamed music broadcasts. Access information and fun without using up the memory on your BlackBerry smart phone. Wireless Email also available in this PDA phone. We also can get online with the web browser that comes in this phone. You also can do file editing using this phone. With WordToGo and SlideshowToGo, you can work on Microsoft® Word and Microsoft® PowerPoint® slides while you’re on the go.1,6 Copy and paste, adjust font formatting and more.7 The stunning LCD display makes working on the go an invaluable option.
Frequencies
The BlackBerry Bold smartphone was designed to take advantage of the speeds available on the HSDPA network1,3. Together, this high speed network and the 624-MHz processor help support your need to multitask and prioritize with access to your voice and data services at the same time.The range of wireless options that this quad-band (GSM 850/900/1800/1900) BlackBerry Bold offers. The most catchy item is the HSDPA/UMTS (850/1900/2100) support that it's known for. This is what everyone's been looking forward to—the first-ever BlackBerry. A lot other treats await you such as the built-in Wi-Fi (802.11a/b/g), Bluetooth 2.0 with full A2DP support, and the integrated GPS (enhanced and assisted).The RIM BlackBerry Bold is compacted with a 624MHz Intel PXA270 processor, as compared to the previous BlackBerrys which were equipped with the 312MHz processors. This technically means that you're up to grab a faster and more explicit level of performance. Additionally, there's the 128MB of flash memory and 1GB of onboard memory, all complemented by the microSD/SDHC expansion slot (supports up to 16GB cards). In terms of quality and performance style, this is a piece that's certain to rock your world.
Cheap BlackBerry Bold Deals

                                          BlackBerry Bold

 

General
2G Network
GSM 850 / 900 / 1800 / 1900
3G Network
HSDPA 850 / 1900 / 2100

Size
Dimensions
114 x 66 x 14 mm
Weight
133 g

Display
Type
65K colors
Size
480 x 320 pixels

- Full QWERTY keyboard
- Trackball navigation
- Wallpapers

Ringtones
Type
Polyphonic, MP3
Customization
Download
Vibration
Yes

- 3.5 mm stereo headset jack

Memory
Phonebook
Yes, Photocall
Call records
Yes
Card slot
microSD (TransFlash), microSDHC, up to 8 GB

- 128 MB flash memory
- 1 GB storage memory
- 624 MHz processor

Data
GPRS
Class 10 (4+1/3+2 slots), 32 - 48 kbps
EDGE
Class 10, 236.8 kbps
3G
HSDPA, 3.6 Mbps
WLAN
Wi-Fi 802.11 a/b/g
Bluetooth
Yes, v2.0 with A2DP
USB
Yes, v2.0

Features
OS
BlackBerry OS
Messaging
SMS, MMS, Email, Instant Messaging
Browser
HTML
Games
Yes + downloadable
Colors
Black
Camera
2 MP, 1600x1200 pixels, video, flash

- Built-in GPS
- BlackBerry maps
- DataViz document viewer/editor
- Java
- Media player MP3/WMA/AAC+
- Video player DivX/WMV/XviD/3gp
- Organizer
- Calculator
- Voice dial
- Built-in handsfree
- Voice memo

Battery

Standard battery, Li-Ion 1500 mAh
Stand-by
Up to 310 h
Talk time
Up to 5 h


3.0            Internet Technology and Services
3.1              VoIP
VoIP stands for Voice Over Internet Protocol and it is also known as Internet Telephony. If you have high-speed Internet (cable/DSL, LAN) on your computer, you can connect your phone to your computer and make calls that way. So, you are basically making telephone calls over your computer. You must have a special adapter for this to work, but when you do, you plug your phone line into the adapter instead of plugging it into the wall jack. The adapter is then plugged into your Internet modem, which allows VoIP to convert the voice signal from the phone line into a data that is able to travel over the Internet.
The cool thing is, you still use your phone the exact same way. You will hear a dial tone and you dial out just like normal. Just with VoIP, everything is combined into one function. Incoming calls will also ring just like normal. The main reason you might decide to invest in this new technology system is to save you money in the long run. VoIP services cost approximately $20 to $30 a month, plus you're not paying for a phone line and Internet connection separately anymore. The VoIP plans usually also include local and long distance calling, while some even provide international calling.
3.2              BLOG
A blog (a contraction of the term weblog) is a type of website, usually maintained by an individual with regular entries of commentary, descriptions of events, or other material such as graphics or video. Entries are commonly displayed in reverse-chronological order. "Blog" can also be used as a verb, meaning to maintain or add content to a blog.
Many blogs provide commentary or news on a particular subject; others function as more personal online diaries. A typical blog combines text, images, and links to other blogs, Web pages, and other media related to its topic. The ability for readers to leave comments in an interactive format is an important part of many blogs. Most blogs are primarily textual, although some focus on art (artlog), photographs (photoblog), sketches (sketchblog), videos (vlog), music (MP3 blog), and audio (podcasting). Micro-blogging is another type of blogging, featuring very short posts.
4.0            Types of network
4.1              PAN
A personal area network (PAN) is a computer network used for communication among computer devices (including telephones and personal digital assistants) close to one's person. The devices may or may not belong to the person in question. The reach of a PAN is typically a few meters. PANs can be used for communication among the personal devices themselves (intrapersonal communication), or for connecting to a higher level network and the Internet (an uplink).
Personal area networks may be wired with computer buses such as USB and FireWire. A wireless personal area network (WPAN) can also be made possible with network technologies such as IrDA, Bluetooth, UWB, Z-Wave and ZigBee.
4.2              VPN
VPN stands for "Virtual Private Network." (Not a competitor of UPN). This is a network term that most computer users don't need to know, but at least you can impress your friends by talking about it. A VPN refers to a network that is connected to the Internet, but uses encryption to scramble all the data sent through the Internet so the entire network is "virtually" private. For example, a large company that has offices in multiple locations may need to send data to the different locations via the Internet. To keep the information secure, the company might first set up a VPN with an encrypted connection. It's basically like having a secure Intranet over the Internet.
4.3              WLAN
A wireless LAN (WLAN) is a wireless local area network that links two or more computers or devices using spread-spectrum or OFDM modulation technology based to enable communication between devices in a limited area. This gives users the mobility to move around within a broad coverage area and still be connected to the network.
For the home user, wireless has become popular due to ease of installation, and location freedom with the gaining popularity of laptops. Public businesses such as coffee shops or malls have begun to offer wireless access to their customers; some are even provided as a free service. Large wireless network projects are being put up in many major cities: New York City, for instance, has begun a pilot program to cover all five boroughs of the city with wireless Internet access.
4.4              WIMAX
WiMAX, short for Worldwide Interoperability for Microwave Access, is a technology that allows wide area high-speed wireless broadband. WiMAX can be deployed over great distances to connect users to data services, like the internet, wirelessly. Currently, WiMAX hasn't seen wide deployment across the United States, though wireless provider Sprint has recently launched its XOHM network based on WiMAX in Baltimore, MD. A consortium of companies, however, has banded together to release widespread WiMAX access under the name Clearwire. WiMAX shares few technical similarities with the similarly named technology WiFi. WIMAX  is a telecommunications technology that provides wireless transmission of data using a variety of transmission modes, from point-to-multipoint links to portable and fully mobile internet access.
5.0            Conclusion
Nowadays, many people use computer to do their work. In this assignment, we can know what is the meaning of computer network and communication. Computer network is a group of interconnected computers. Communications means the process of transferring information from one source to another. Besides that, we also can get the meaning of mobile computing. Mobile computing is a generic term describing one ability to use technology while moving. Some examples of mobile computing are PDA phones and 3G mobile phones. One example of PDA phone is BlackBerry Bold. We also can know about Internet Technology and Services. VoIP or Voice Over Internet Protocol known as Internet Telephony. A BLOG is a type of website. It is usually maintain by an individual with regular entries of commentary. There are four types of network that can be used by the computer. One of them is PAN or Personal Area Network. This network is used for communication among computer devices close to one’s person. VPN stands for Virtual Private Network. This is a network term that most computer users don’t need to know. WLAN is a wireless local area network that link two or more computers or devices. Another network is WIMAX. It is stands for Worldwide Interoperability for Microwave Access. It is a technology that allows wide area high-speed wireless broadband. When doing this assignment, we can know about the latest development in network and communication. 
Reference
http://en.wikipedia.org/wiki/Computer_network
http://en.wikipedia.org/wiki/Communication
http://dictionary.babylon.com/mobile%20computing
http://www.worldstart.com/tips/tips.php/2495
http://en.wikipedia.org/wiki/Blog
http://en.wikipedia.org/wiki/Personal_area_network http://www.iwebtool.com/what_is_vpn.html
http://en.wikipedia.org/wiki/Wireless_LAN
 http://www.obsessable.com/glossary/wimax/
 http://en.wikipedia.org/wiki/WiMAX http://www.3mobileshop.co.uk/showphone.asp?id=1393 http://www.blackberry.com/blackberrybold/featu http://na.blackberry.com/eng/devices/http://www.compusa.com/applications/SearchTools/item-details.asp?EdpNo=3980706&Sku=B529-0102blackberry http://en.wikipedia.org/wiki/Mobile_computingbold/bold_features.jspres.shtml

2 comments:

  1. Virtual PBX system along with tollfree numbers can help you attract more customers to your business. Virtual PBX service providers offer virtual phone numbers and toll free numbers.

    ReplyDelete
  2. thnks la,,, terima kasih very much untuk this blog...

    ReplyDelete