Cyberguide A mobile context-aware tour guide

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					            Cyberguide :
  A mobile context-aware tour guide



G. D. Abowd ,C. G. Atkeson, J. Hong, S. Long, R.
    Kooper and Mike Pinkerton, in Wireless
    Networks
-- presented by Yu-Chee Tseng --


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                      Introduction

 mobile application should be contextural-aware
    be aware of user’s current position
    be aware of user’s current orientation
    history
 Cyberguide project at GIT:
    to explore context-aware mobile applications for future
     computing environments
    to develop an intelligent handheld tour guide




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                Introduction (cont.)
 Short-term goal :
    fast prototyping a context-aware tourguide based on PDA
     and pen-based PC
 Long-term goal:
    know where tourist is, and what she is looking for
    predict and answer question she may pose
    provide interaction with other people and environment




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Future Mobile Context-Aware Tourguides
 should be handheld
 has a screen, with pen/finger input interface
 storage (e.g., CD drive)
 communication device (e.g., to access Web)
 audio I/O: speech generation and speech recognition
 video I/O: display information and for videotaping
 can receive information anywhere

 Wearable computing


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Future Mobile Context-Aware Tourguides
                (cont.)
 positioning system:
    outdoor: GPS (global positioning system)
    indoor: infrared beacon
 object of interest should be marked (say, with active
  beacons)
 provide route planning and travel direction
 multi-lingual dictionary
 as a travel agent: to make reservation and to find shortest
  path



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Future Mobile Context-Aware Tourguides
                (cont.)
 a heads up display
    to provide “X-ray” vision of an architecture
 electronic tour diary:
    videotaping
    user commentary on a map
    recording the trace of tour on a map
 group interaction:
    to exchange touring experience
    to steer a demo
    to vote for some group decision


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            Architecture of Cyberguide

 Cartographer:
    map component
    has knowledge of physical surroundings
 Librarian:
    information component
    provide access to information about sights that a tourist
     might encounter
 Navigator:
    to chart the position of the tourist
 Messenger:
    wireless communication component
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              The Indoor Cyberguide
 Apple MessagePad 100 with Newton 1.3
 Map component
    a map of entire GVU (GIT’s Graphic, Visualization, &
     Usability) Center
    Fig. 1 (left)
    automatic scrolling
    zoom in, zoom out
    stars: to show user’s position and demonstration stations




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         The Indoor Cyberguide (cont.)
 Information component
    information about each demo site at the GVU center
    Fig. 1 (right)
    select star icon to reveal its name and the information therein
    can search for specific information pages




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        The Indoor Cyberguide (cont.)
 Communication component
    Appletalk connection a Unix Appletalk Gateway
    support TCP/IP packets
    HTML
    send/receive emails
    Fig. 2 (for users to complete a questionnaire)




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         The Indoor Cyberguide (cont.)

 Positioning component: to sense the user’s current position
    GPS:signals are too weak or not available in indoors
    RF : too expensive
    infrared IR: low-cost and convenient
 IR is selected for indoor usage: (Fig. 3)
    a array of TV remote control (hanging from ceiling )
        each sends out unique beacons (cell ID) periodically through
         IR 40kHz
    IR receiver
        controlled by Motorola 68332
 Keeping track of last recorded cell location provides a
  good guess to predicate user’s orientation
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         Extending to Outdoor Cyberguide

 out-door positioning:
    replace IR module with a Trimble GPS unit
    Fig 4.: Georgia Tech campus
 map:
    pixel: easier to obtain
    vector-based map: more difficult to implement
        arbitrary scaling and rotation
 platforms
    pen-based PC
    Windows CE 1.0
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 Fig. 5: map interface
    history: visited places are checked
    can generate a summary of today’s visited cites




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 Fig. 6: information browser
    serve as an electronic tour guide




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 Fig. 7: communication device (through IR) to connect to
  their departmental network, and then to Internet




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 wireless communication for email: Fig. 8




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 broadcasting from the backbone network: Fig. 9




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 Extending to Outdoor Cyberguide (cont.)
 Increase interaction with environment
    visitor can keep record of her experiences
    user-modifiable database
 CyBARguide: Fig. 10
    multiple maps at varying levels of details
    automatically choose the map with the highest details




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                       Future work

 modifiable information database
 inclusion of digital camera
 increased communications
    higher speed (say, through wireless modem)
    web-based browsing
 Improved context awareness
    where is other tourists, knowing user’s reaction ...
 use of computer vision
 multimedia support


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                      Conclusions
 prototyping of a context-aware mobile application for
  tourguide
 help to clarify some signification research issues in mobile
  computing




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