1. Object Calling Home: Locating Objects Using Mobile Phones By: Christian Frank Philipp Bolliger Christopher Roduner Wolfgang Kellerer 구 본 임 bonimku@hotmail.com

2. Motivation Locating everyday objects  By using mobile phones & electronic tags:  No costly infrastructure needed

3. Features Mobile phones vs Object sensing infra. On a user’s request vs Constant reminding Reactive vs Proactive

4. Association between  Users & Objects  A user & Object sensors  Similar users & Certain objects Storage: User DB, Association Registery Localization: Cell or DB Location Profile Components

5. System Architecture

6. Experiment  4 users with mobile phones  Tagged objects  During core office hours for 30 hours

7. Simulation Environmental & Design Parameters Cell-based version:  Environment Model  Mobility Model  Sensor Model Position-based version: Scoping

8. Achieved Results Success rate  More queries, better rate  Specific scoping > random strategy Longer timeout Higher sensing range

9. Arguments Will this research enhance our quality of life? What’s ROI of the research ? What if you have lost your mobile phone?