Context in Ubiquitous Computing

Context sensing

Growing up

Context aware cup

Context aware devices

Pervasive Computing

Evolution of the Digital Computer Mainframe Centralized Computing 1960 Portables Mobile Computing 1990 Sensor Network Pervasive Computing 2000 Interne t PC Distributed Computing years

Matilda Smart House

Wearable Computing

Context aware application

Why Simulate?

Check locks on doors and windows Other Services Automatically refill prescription Check if laundry is done Call in a nurse Call in for help and Assistance Monitor of kitchen: oven and stove on/off; temp. Turn on/off lights (and visually inspect) other rooms. Sense and see visitors/strangers at front door Order groceries with dietary restrictions Smart Phones

Medicine Reminder/Compliance UnLatch Client Server Response Query Reply Request Proxy HTTP Interface Query Response Generated PulseData written to portUnlock request CircuitTINI Board Scanner Medicine Bottle Pharmacy Schedule & deliver medicine reminders to a large population of users Direct access to the system by the pharmacy Provide Medicine information along with reminders Automatic refill & possible home delivery Support for compliance (correct medication intake, and safeguards against overdose)

Actuators and Sensors An agent observes the state of the world and can act by controlling actuators. Actuators are (weakly) related to sensors. Observes Controls Influences

Relationships Actuators operate in a certain domain. Sensors sense a certain domain. The activation of an actuator aims to change the state of a domain. Disallow conflicting operations! Raises Lowers Don’t turn on ac & heater at same time!

Restricting Behavior For every context we define what actions are permissible. We describe which java methods are allowed to be invoked. We can enforce policy by inserting security code into classes when they are loaded (bytecode instrumentation).

Advantage RFiD Expiration {Not Expired, Expired} Can cook Cannot cook Cooking a pizza Diet {Healthy, Unhealthy} Forget about your pizza

Types of Sensors

Smart Homes

Features

Crystallization of the vision

Application areas