Figure 8

Second step of the implemented scenario: Turn on light when nurse enters the room. This sequence diagram visualizes the different actions taken during the second step of the scenario realized by the implemented prototype. In this step, a nurse enters the room of the patient. This is detected by using RFID Tags, which send an Event to the SCB. The Localization Component is alerted of this Event as it matches with the filter rule this application component registered with the SCB. The location of the nurse is updated and this information is published on the SCB. This location information is forwarded to the oNCS and the Home Automation Application Components as it matches with their filter rules. The first just updates the location of the nurse in its local domain-specific ontology. The second uses this information to adjust the light level in the room of the patient. Finally, the light sensor in the room notices the change in light intensity and publishes this Event on the SCB. This Event matches with the filter rule of the Home Automation Component, which receives this Event and reasons that the light was adjusted to the appropriate level. The different Events are depicted in blue. The “par” indicates that the different application components can perform these actions in parallel.