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                  Figure 3: Gantt chart before load balancing  Figure 4: Gantt chart after load balancing.



               CONCLUSIONS


               This paper dealt with the integration of process planning and scheduling systems using process plan  modification
               system. Following are the conclusions:
               (1)  Systematic methods for load balancing of the machining equipment and for modifying  the process plans are
                 proposed in order to obtain a modified processed plan based on the feedback information  from the scheduling
                 results.
               (2)  A prototype of the process planning and scheduling systems has been implemented.  Some case studies show
                 that  the  total  make  span  can  be  improved  from  the  modified  process  plans  obtained  after  the  feed  back
                 information from the scheduling results.



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