Boundary Conditions Samuel Chong Repair Team STARS Project 15-413 Boundary Conditions Samuel Chong Repair Team STARS Project Carnegie Mellon University 11 November 1999 2 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Subsystem Breakdown Augmented Reality Authoring Inspection Modeling Repair Workflow 11 November 1999 Sticky Technology for Augmented Reality Systems

Subsystem Dependencies 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Initialization Augmented Reality UI service provider No data required, no other systems required Expects widgets from Modeling, Inspection, and Repair Authoring Access into the workflow database must be available An initialization data file must be available Paper document sources must be available 11 November 1999 Sticky Technology for Augmented Reality Systems

Initialization (cont) Inspection Augmented Reality must provide its services Modeling Workflow database must be available for data on the airplane 11 November 1999 Sticky Technology for Augmented Reality Systems

Initialization (cont) Repair Inspection should provide its visual UI for workorder and sticky navigation Workflow database should provide documents such as workorders and IETMs Workflow Server requires a user data file for authorization purposes Client has no initialization dependencies 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Termination Workflow Database should be highly available; i.e. termination is not a normal occurrence Client has no restrictions on termination Workflow is unaffected by the termination of other systems Authoring System is only required during creation and modification of digital documents, and will terminate once that is done Termination does not affect other subsystems 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Termination Augmented Reality Should terminate only when PEDD is not being used If terminated, other subsystems running on the PEDD will no longer receive input events except through speech Repair Should terminate once the repair is done If terminated, other subsystems running on the PEDD can no longer be speech-controlled 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Termination Modeling Will terminate when maintenance is over Does not affect other subsystems when terminated Inspection Will terminate once maintenance is over Data must be saved to Workflow database Termination will render Repair subsystem non-functional 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Failure Overview Communications failure Likely to be a common problem because of the environment Wireless communication, if it is not available, should be covered by a wired alternative Data loss True robust error recovery is beyond the scope of this phase of the project Reinitialization of each system is the easy solution for crash recovery 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Failure Workflow Notifications Other subsystems will have to wait until communications are restored to retrieve data Augmented Reality No external communications requirements No persistent data to back up 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Failure Authoring If workflow is unavailable, no submissions are possible Version control can provide limited protection from data loss Modeling Relies somewhat on the Workflow database for some necessary information No persistent data to back up 11 November 1999 Sticky Technology for Augmented Reality Systems

Sticky Technology for Augmented Reality Systems Failure Inspection and Repair If Workflow database is down, no data can be retrieved or submitted All persistent data is stored in Workflow database 11 November 1999 Sticky Technology for Augmented Reality Systems