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Technology in Action

Technology in Action

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Technology in Action

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  1. Technology in Action Chapter 8 Mobile Computing:Keeping Your Data on Hand

  2. Chapter Eight Objectives • Advantages and limitations • Mobile Computing Devices • Pagers and cell phones • Portable media players • Personal digital assistants • Tablet PCs • Laptops • Synchronization of mobile devices

  3. Advantages and Limitations • Limited battery life • Small Screen display • Slow mobile Internet connection • Wireless Internet coverage may not exist • More costly • Less robust • Communicate wherever you are • E-mail • Cell phone • Access and change electronic information • Update Word/Excel Files

  4. Paging Devices • A paging device (a pager) allows you to receive and sometimes send numeric (sometimes text) messages • Inexpensive and lightweight • Different kinds • Numeric: only receive numeric messages • Alphanumeric: receive text and numeric messages • Two-way pagers: you can compose a text message • Not popular any more • Cell phones tend to dominate the market

  5. Some Cellular Phone Features • Internet access • Requires an Internet Service Provider • Microbrowser software needed because the screen space is small • Wireless Markup Language is used to create websites for wireless devices • Text messaging: Send messages to another cell phone or an e-mail address • SMS (Short Message Service) • Messages include only text (usually up to 160 chars) • MMS (Multimedia Message Service) • Messages include text, sound, images, video clips

  6. Cell Phones Have the Same Components as a Computer! • Processor (CPU) • Operating system • Symbian OS, Windows Mobile • Phones nowadays can have up to 20 Mb of memory • ROM: Store the operating system • Separate Internal memory: contact data, images, ring tones • Input Devices • Microphone, keypad, camera • Output Devices • Liquid Crystal Display (LCD)

  7. Portable Media Players • MP3: Format for storing music in digital files (series of bits) • Portable media player (PMP): A small device that stores and plays music • Storage space determines the number of songs stored: • Built-In flash memory up to 8GB • Hard drive up to 80 GB • Sampling rate also affects number of songs stored

  8. PMP Player • Ripping • Converting a song from a CD into a digital MP3 file • Sampling Rate: the number of times per second the music is measured and converted to a digital value • E.g. 192 kilobits per second (Kbps) • The higher the sampling rate the better the quality of the sound, but the larger the file size • Transfer Files to PMP Player • PMP devices come with software that allow you to transfer files from your computer to your player • PMP devices are connected to a computer through a high speed port (e.g. FireWire port, USB 2.0 port)

  9. Personal Digital Assistants • Personal Digital Assistants (PDAs) • Devices that allow you to carry digital information • E.g. Excel/Word files, songs, photos, games • Often called Palm Computers or Handhelds • Operating system • Palm OS from Palm • Windows Mobile

  10. PDA Hardware • Processor • Speed varies (e.g. 624 MHz) • Input Devices • Touch sensitive screen • Stylus: a penlike device used to enter data • Keyboard: Integrated or Portable • Output Devices • LCD screen • Grayscale • Color • Internal Memory • RAM, ROM • External Memory • Removable flash memory cards

  11. PDA File Transfer to Desktop • Desktop can have memory card reader • Built in • External (USB port) • Using a cradle • Connects the PDAs to the desktop using a USB or serial port • Wireless • Infrared port on the PDA • Radio waves (Bluetooth technology for distances up to 30 ft) • Synchronization • Process of updating your data so the files on your PDA and computer are the same • Use Cradle

  12. Tablet PCs • Portable and lightweight • Two monitor modes: • Laptop • Tablet • Advanced handwriting recognition capabilities • Pressure sensitive screen • Digital pen, digital ink • Draw images and enter text • Docking station • Connects printers, mice and other peripherals • Operating System • Window XP Tablet PC

  13. Laptop Computers • Also called “notebooks” • Powerful portable solution • Hot-swappable bays • E.g. exchange a DVD drive with a Zip drive • Slower processors than desktops • In laptops power comes from batteries • Laptop batteries • Rechargeable • Lithium based • Nickel based • Memory effect: battery has to be used up before recharged

  14. Laptopor Desktop? • Laptops: • More costly, because of the small footprint • Less expandable • Not easy to add new ports and devices due to space constraints • Exposed to more hazards, possibly theft • Great location flexibility