Smart Signs Showing the way in Smart Surroundings


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Smart Signs Showing the way in Smart Surroundings

  1. 1. Smart Signs Showing the way in Smart Surroundings
  2. 2. Outline  Introduction  Related Work  System Architecture  Supporting Multiple Interfaces  Privacy  Conclusions and Future Work
  3. 3. Introduction  Smart wayfinding  Health-care  Privacy
  4. 4. Related Work  To offer people information about their surroundings lack navigational support  Indoor Navigation Systems IRREAL, CricketNav, ARIADNE  User Interfaces GentleGuide, rotating compass  Context-aware Messaging GPS, Bluetooth, to use a desktop program to post the availability status of employees on the display at their office door
  5. 5. System Architecture
  6. 6. System Architecture  System Architecture World Model Route Planner Service Compressed Routing Tables Guidance Service Guidance Presentation Service (Message Presentation Service) Deployment Tool Smart Signs system Simulator Emergency Service
  7. 7. World Model  To provide guidance and messaging functionality  IP Subnets, Addressable Locations, contain other spaces,  Access rights  Addressable locations marked by an arrow pointing down  Smart Signs marked by a circle with an arrow  Access Points marked by a puzzle piece with an up- arrow
  8. 8. System Architecture
  9. 9. Route Planner Service  The Route Planner computes routes for every Smart Sign to all possible destinations  Placement of edge  Indoors, Outdoors, Outdoors Protected from rain  Inclination  Flat, Stairs, Lift, Ramp  Means of transport that the edge can manage  Walking, Wheel-chair, Clutches, Bicycle, Car, Motorbike  Risk factor  Always, During working hours, Outside working hours, At night, When wet, When fire in building, When fire in the area range  Accessibility: only valid for outgoing edges of an Access Point
  10. 10. Route Planner Service  User parameters Affinity to stairs Affinity to lifts Transportation availability Weather preferences Access Rights  Context Information Time Weather Transient situation Emergency situations
  11. 11. Compressed Routing Tables  For each Smart Sign the route planner computes routing and adjacency tables  Routing table contains  Destination (Address)  Next Step (Address)  Cost  An entry in the adjacency table  Neighbor (Address)  Direction,  Cost  The Smart Signs only need to know the direction towards a destination.  Therefore, an entry for a compressed routing table is simply: [Destination (Address-Mask), Direction].
  12. 12. Guidance Service  The task of the Guidance Service is to receive guidance requests from users and groups, and to send the guidance rules for that request to the Guidance Presentation Service in the Smart Signs  Apart from a general Table of Guidance Requests, the Guidance Service keeps for each Smart Sign the following information: Default Routing Table Table of Special Directions An entry is as follows: [RequestID, UserID/GroupID, Direction]
  13. 13. Guidance Service
  14. 14. Guidance Presentation Service  Each Smart Sign decides autonomously how to guide the people that it identifies in its vicinity using the information provided by the Guidance Service  Clean up  The Guidance Presentation Service uses the following tables, which are provided by the Guidance Service  Table of Guidance Requests  Table of Aliases  Mapping of Groups to Tags  Default Routing Table  Table of Special Directions
  15. 15. Supporting Multiple Interfaces  The Smart Signs system can also be used on a handheld device as Virtual Smart Signs  We have implemented such an interface in combination with FLAVOUR  FLAVOUR does not track people and gives users control over who they share their location information with and under which conditions  The user interface consists of an SVG viewer where the user can view his location, the location of his buddies, and the directions and messages provided by Smart Signs  haptic interfaces
  16. 16. Privacy  As a first step to protect user’s privacy, we secured the communication links to prevent eavesdropping  As a second step we designed a system that is privacy aware  Each Smart Sign decides locally how to provide guidance and messaging, and after the user leaves the signs vicinity it forgets it has ever heard his tag  To switch off their tags and just switch them on when they have pending guidance requests or expect to see relevant messages in the environment
  17. 17. Conclusions and Future Work  We present a novel use of wireless sensor networks for ubiquitous computing  not only for context gathering but also for actuating accordingly  The Emergency Service is still an early prototype  a calendar service obtain information from the user’s calendar should only be shown to certain groups of people