Exercise 9.7 Consider the belief network of Exercise 6.8 (page 278). When an alarm is observed, a decision is made whether to shut down the reactor. Shutting down the reactor has a cost cs associated with it (independent of whether the core was overheating), whereas not shutting down an overheated core incurs a cost cm that is much higher than cs.

(a) Draw the decision network to model this decision problem for the original system (i.e., with only one sensor).

(b) Specify the tables for all new factors that must be defined (you should use the parameters cs and cm where appropriate in the tables). Assume that the utility is the negative of cost.