1. 29 November Solving Problems

2. Presentations News: Sarah Waugh The Matrix: Ryan Thorpe

3. 1954 Photo – Oops! Washington, D.C., Apr. 10, 2000 — A full-scale mock-up of a typical nuclear-powered submarine's maneuvering room in which the ship's engineers control the power plant and electrical and steam systems. U.S. Navy photo by Photographer's Mate 2nd Class Tim Altevogt. [000410-N- 7495A-004] Apr. 10, 2000.

4. Assignments Return tests emails on soft copies that I’d like to have Arts papers – still have a couple of movies to watch

5. Solving Problems What is the problem? What are the constraints? What can be done to solve or mitigate the problem? How could computers help? Brainstorming Pros and cons What are the obstacles to this solution?

6. Clever Cats Problem What is the problem? I have two cats that hide when it’s time for them to go out in the morning What are the constraints? They can’t wear collars What can be done to solve or mitigate the problem? I need a tracking device

7. Clever Cats Solutions Brainstorming solutions GPS RFID Bluetooth

8. GPS Global Positioning System Satellite system used for accurate time and location Uses trilateration Requires line of sight with satellite Doesn’t work well indoors

9. RFID Radio Frequency ID Tags contain antennae that enable them to respond to radio signals from transceivers Most in use are passive No battery source Radio signal provides enough energy to respond 40 cents per tag Distance based on antenna of transceiver

10. Bluetooth Named for King Harold Bluetooth of Denmark who unified warring tribes Unifying technology Wireless personal area network low power consumption Short range (from 10 up to 100 meters) low-cost transceiver microchip

11. Implanted RFID tag How do I locate the cats? Hand-held device Receivers at every door Single display Light over every door How tightly do I need to find them? Within a room is sufficient How much infrastructure do I want to add? Wires that show Tear up walls Constraint: half my house is open rooms without doors

12. Solution Passive RFID tag implanted in each cat Handheld device that contains an RFID transceiver Needs to have a small radius Too large will tell me that the cat is in the house But I already know that!

13. Class exercise: single login id What is the problem and constraints? I only want to log in once. I want it to be secure. I want required password changes hidden from me. I want the solution to work anywhere that I log in. I don’t mind carrying a small device to do it. I’m willing to pay for the service. I don’t want to wait for every site on the web to change to do this.

14. Class exercise: single login id What can be done to solve or mitigate the problem? How could computers help? Brainstorming Pros and cons What are the obstacles to this solution?