Multiobjective Optimization of Cloud Manufacturing Service Composition with Improved Particle Swarm Optimization Algorithm

Table 1

Calculation of execution time and cost for different types of service composition [30].

No.	Composition types	Execution time	Execution cost
1	Sequence composition
2	Parallel composition
3	Choice composition
4	Cycle composition

Note. is the probability that the i-th service in the choice composition is selected, and . If the i-th service must not be selected, then . If the i-th service must be selected, then , and the probability of other services being selected is 0. k denotes the cycle number.