1. Location Sensing (Inference)
CS492B proposal
이영기, 배진석

2. Contents Definition of location sensing Motivation
Ubiquitous computing
Location-based computing
Location sensing system
Requirements
Possible technologies
Technology examples
Expected results and plans

3. Location-Sensing ?
Locating the exact position of moving objects (end users, mobile devices)

4. Motivation (Ubiquitous Computing)
Ubiquitous applications
Collect context or environmental information
Process the collected information
Deliver useful services
First step of most ubiquitous applications is collecting context information
Location will be significant information for future ubiquitous services

5. Motivation (Location-aware Computing)
Outdoor
Indoor
CDMA
WiFi
GPS. RFIDs, beacons
Moving Objects
Location Data
Location data filters
Location-based services
The location is an important context that changes whenever the
object moves
Location-aware services allow to offer value-added service to the user, depending on their current geographic position and will be a key feature of many future mobile applications

6. Requirements of Location System
Affordability
Client cost + infrastructure cost
Resource requirements
Limited memory, computational capabilities, and power
Privacy
Hide users’ location
Portability
Fast evolution of mobile devices
Precision
Granularity that a system is capable of measuring
Accuracy
Percentage of the time a known level of precision is reached

7. Technologies Outdoor Indoor GPS, triangulation in cellular network
RFIDs
Ultra-wideband
timing
signal strength
Many low-power access points
Many low-power Bluetooth sensors

8. Technologies: Wireless LAN
Timing and signal strength

9. Technologies: Ultrasonic pulses and radio signals
Active Bat
ultrasound time-of-flight measurement
can locate Bats to within 9cm of their true position for 95 percent of the
measurements
Cricket
Ultrasonic time-of-flight and a radio frequency
control signal
Lateration and proximity techniques
Decentralized scalability
Listener
Beacon

10. Technologies: RFIDs
LANDMARK and SpotOn

11. Expected Results What to do Additional Work Extensive survey
A Seminar and a survey paper
Additional Work
Implement one of the location inference system and demonstrate
New location sensing system design

12. Plans Date Category Contents 11.4~11.10 Outdoor sensing
GPS, cellular network (e.g. E911/E112, Place Lab)
11.11~11.16
Indoor sensing
active badge(AT&T), active bat
cricket(MIT)
11.17~11.23
wireless LAN based technologies
11.24~11.30
RF-based systems(RADAR, Pinpoint, SpotOn, LANDMARK)
11.30~12.6
Commercial systems
commercial systems, other state-of-the art technologies
12.7~
seminar, survey paper