Opmt 303 1st Edition Lecture 10Outline of Last Lecture1. Management of quality2. Key Contributors to Quality Management3. TQMOutline of Current Lecture1. Production activity control2. Common scheduling criteria3. SPT, EDD, and CR characteristics4. Johnson’s priority ruleCurrent LectureI. Production activity controla. Objectivesi. To determine set of principles and techniques used by managers to plan, schedule, control, and evaluate shop production operationsb. Inputi. MRP, routing data, due datesc. Characteristicsi. Operational decisions made daily and hourlyii. Backward and forward scheduling, sequencing, and dispatchingd. Outputi. Job status reportinge. Responsiblei. Executed by foremanII. Common scheduling criteriaa. Flowtimei. Time an individual job spends in a system (shop).ii. Find priority rule that minimizes average flowtimeb. Tardiness (lateness)i. Amount of time a job is behind a due dateii. Find sequence that minimizes average tardiness, number of tardy jobs, maximum tardiness (max customer satisfaction)c. MakespanThese 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.i. Time to process all jobsii. Find a sequence that minimizes makespan (max utilization)III. SPT, EDD, and CR characteristicsa. SPTi. Always minimizes average flow timeii. It is also good for tardinessiii. Often called “the prince of priority rules”iv. Used in CPUs and printers but very seldom in productionv. Truncated SPT is used for a certain period of timeb. EDD i. Very good for tardiness (always minimizes maximum tardiness)c. CRi. Extremely informative about a progress of each jobIV. Johnson’s Priority rulea. Always minimizes makespan and idle time on M2b. Forward and backward schedulingi. Either schedule jobs forward starting today or backward starting from the due datesc. Inventories but good chance of meeting fur datei. No inventories but
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