In class exercises, November 18, 2014.

1) Consider the exercise on slide 30 (repeated below):

Service |  Availability | ResponseTime
    s1  |       92%     |     12sec
    s2  |       97%     |     15sec
    s3  |       87%     |      3sec
    s4  |       97%     |      7sec

Utility(Service S) = Availability(S) + ResponseTime(S)

Availability(S):

       1.0|            |-------
          |            |     .
       0.7|        |---      .
  U       |        |    .    .
          |        |    .    .
       0.0|___.____|____.____.____   

             85   90   95   100  (Time)


ResponseTime(S): 

       1.0|---
       0.8|   |----
  U    0.6|        |
       0.4|        |-------
       0.2|               |
       0.0|___.____.____._|__.____   

              5   10   15   20   (Time)


Calculate the utility of each service.

2) Consider the comet lander.
   What are potential utility functions?
   What are the limited resources (both actual and potential)?
   What would a MAPE-K model look like for the lander?
   What are the benefits of a MAPE-K model in this situation?
   What are the risks of a MAPE-K model in this situation?