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kaledai kaledai
wrote...
6 years ago
Given the following chart of jobs assigned with Johnson's rule, suppose that all the jobs (A, B, C, etc) could be evenly divided into two tasks (such as A1 and A2, B1 and B2, etc).
 
  Suppose job B is divided into jobs B1 and B2, each with a body work time of 4.5 hours and a paint time of 2 hours. How much is makespan reduced by this splitting of B?
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#1
6 years ago
B1 could start on paint at time = 34.5 (1/2 through the completion of B) but E is busy on paint until t = 35, thus B1 will be delayed until t = 35 to start and thus would finish paint at time = 37. B2 could start on paint at time = 39 and would take until t = 41 to finish. Thus makespan is reduced by 2 hours (43 - 41).
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