Opmt 303 1st Edition Lecture 10 Outline of Last Lecture 1 Management of quality 2 Key Contributors to Quality Management 3 TQM Outline of Current Lecture 1 Production activity control 2 Common scheduling criteria 3 SPT EDD and CR characteristics 4 Johnson s priority rule Current Lecture I II Production activity control a Objectives i To determine set of principles and techniques used by managers to plan schedule control and evaluate shop production operations b Input i MRP routing data due dates c Characteristics i Operational decisions made daily and hourly ii Backward and forward scheduling sequencing and dispatching d Output i Job status reporting e Responsible i Executed by foreman Common scheduling criteria a Flowtime i Time an individual job spends in a system shop ii Find priority rule that minimizes average flowtime b Tardiness lateness i Amount of time a job is behind a due date ii Find sequence that minimizes average tardiness number of tardy jobs maximum tardiness max customer satisfaction c Makespan These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III IV i Time to process all jobs ii Find a sequence that minimizes makespan max utilization SPT EDD and CR characteristics a SPT i Always minimizes average flow time ii It is also good for tardiness iii Often called the prince of priority rules iv Used in CPUs and printers but very seldom in production v Truncated SPT is used for a certain period of time b EDD i Very good for tardiness always minimizes maximum tardiness c CR i Extremely informative about a progress of each job Johnson s Priority rule a Always minimizes makespan and idle time on M2 b Forward and backward scheduling i Either schedule jobs forward starting today or backward starting from the due dates c Inventories but good chance of meeting fur date i No inventories but risky
View Full Document
Unlocking...