JED The constraint that each person is assigned exactly one task can be expressed simply as: Exi, .1, for all iES. JED ; Also constraint that every task gets covered by someone is just: 1 , for all jED. iEs - Except for the assumed integrity of the decision variables, xu, the assignment problem is just a Hitchcock transportation problem in which the supply at every supply node (person) is one and the demand at every demand node (task) is also one.
4. Parallel Machines Scheduling Problem The parallel machines scheduling problem considered in this project is described as follows: a set N = (1,2, , n} of n jobs available at time zero is to be processed on m identical parallel machines. Each job iEN is to be processed without interruption on one of the m machines with processing time p,. Each machine can process only one job at a time and no job may be processed by more than one machine. Setup time, if any, is included in the processing time. Each job has cj and vvi,1