1 / 38

Review for Exam II—Mar 20, 2002

Review for Exam II—Mar 20, 2002. Dr. Burns. Exam Format. 45-55 multiple choice 3 problems Closed-book Closed-notes Closed-neighbor BRING---pencil, calculator, scantron. Exam Coverage. Chapters 11, 12, 13, 14 NO CHAPTER SUPPLEMENTS No linear programming No simulation.

shirley
Download Presentation

Review for Exam II—Mar 20, 2002

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Review for Exam II—Mar 20, 2002 Dr. Burns

  2. Exam Format • 45-55 multiple choice • 3 problems • Closed-book • Closed-notes • Closed-neighbor • BRING---pencil, calculator, scantron

  3. Exam Coverage • Chapters 11, 12, 13, 14 • NO CHAPTER SUPPLEMENTS • No linear programming • No simulation

  4. Typical problems—see Practice Exam II • Aggregate production planning • Inventory with Independent Demand • Material Requirements Planning • Capacity Requirements Planning

  5. Chapter 11 -- Capacity Planning and Aggregate Production Planning • Long Range Planning • Medium Range Planning • Aggregate Production Planning

  6. What are the inputs to the aggregate planning system?? • Demand forecasts • Capacity constraints • Strategic objectives • Company policies • Financial constraints • NOT • Size of workforce • Inventory levels • Units subcontracted

  7. Capacity planning is…. • Long-term strategic decision-making • NOT • Capacity requirements planning

  8. When doing capacity planning, which of the following steps is accomplished first? • a.Resource requirements plan • b.Rough-cut capacity plan • c.Capacity requirements plan • d.Input/output control

  9. Aggregate Production Planning Strategies are…. • Pure (Trial-and-error) • Chase Demand • Level production • Mixed (optimal) • Linear programming • Simulation

  10. Which of the following strategies matches production to demand by hiring and firing workers? • Chase demand strategies • Level production strategies • Strategies the use subcontracting and overtime

  11. Which of the following is not a strategy for managing demand • Shifting demand into other time periods with incentives, sales promotions and advertising campaigns • Offering products or services with countercyclical demand patterns • Partnering with suppliers to reduce information distortion along the supply chain • Increasing inventories and laying off workers when demand is soft

  12. Aggregate production planning Best operating level Capacity planning Capacity cushion Chase demand Pure strategy Level production Pure strategy Mixed strategy Disaggregation Diseconomies of scale Yield management Terms

  13. Chapter 12 – Inventory Management • Inventory for Independent demand

  14. Carrying costs • Rent • Lighting/heating • Security • Interest • Taxes Can also be expressed as a % of product cost A rule of thumb is 30%

  15. Ordering costs—costs related to Transportation Shipping Receiving Inspection

  16. ABC Classification—what is the point?? • To concentrate, focus on the those items in inventory that constitute the highest dollar value to the firm • Class A items constitute 5-15% of the items and 70 to 80% of the total dollar value to the firm • Class B items constitute 30% of the inventory items but only 15% of the dollar value • Class C items constitute 50 to 60% of the items but only 5 to 10% of the dollar value

  17. ABC Classification.. • Class A items are tightly controlled • Class B items less so • Class C items not at all • Dollar values are computed by multiplying the dollar cost by the annual demand for the item • This technique is used in all auto parts inventory control systems and have been for 15 years

  18. Periodic inventory systems are…. • Fixed Time period systems • NOT • EOQ Models

  19. EOQ models have • A fixed order quantity • Deterministic demand • No shortages • Constant lead time • Instantaneous or finite replenishment • EOQ models minimize ordering and holding costs

  20. Which gives you lowest holding cost? • Instantaneous replenishment • Finite replenishment • Quantity discounts • WHICH OF THE ABOVE GIVES YOU LOWEST TOTAL ORDERING COST?

  21. How do we calculate a re-order point?

  22. ABC system Carrying costs Continuous inventory system Dependent demand EOQ Fixed-order quantity system Fixed time period system Independent demand Inventory In-process inventory Noninstantaneous receipt Order cycle Quantity discount Stockout Service level Terms

  23. Chapter 13 – Material Requirements Planning • Inventory for Dependent Demand

  24. MRP is applied mostly to • Project operations • Batch operations • Assembly line operations • Continuous operations

  25. Material requirements planning is a system for • Computing EOQ’s • Determining when to release orders • Computing safety stocks • Determining service levels WHICH????

  26. Formulas/Rules • Projected on-hand = prev projected on-hand + scheduled receipts + planned order receipts – gross requirements • Is really the on-hand amount at the end of the period • Net requirements = gross requirements – previous projected on-hand • If less than zero, set to zero • Planned order receipts must be sufficient to accommodate the net requirements • Planned order releases are the same in amount as planned order receipts, just offset one or more periods by the lead time

  27. MRP led to….. MRP II, which led to…. ???, which is where we are today

  28. ERP • Large caps have been there and done that • Mid and small caps are getting there • Read the book NECESSARY BUT NOT SUFFICIENT by Eli Goldratt if interested

  29. More ERP • Based on an N-tier distributed architecture • Not on mainframe glasshouse

  30. Advantages of N-tier architecture • Data integration • Better usage of MIPS on both PCs and servers • Solves the 36 month backlog of the centralized MIS shop • Leads to the decentralization of MIS

  31. Sales & distribution Production & Materials Management Quality management Human resource management Project management Accounting and controlling ERP Modules

  32. Capacity Efficiency Bill of Material Product structure File Master Production File Explosion Expediting netting Terms

  33. Load profile MRP II CRP ERP Modular BOM Utilization Time bucket Time fence Order splitting More terms

  34. Chapter 14 – Detailed Scheduling • Scheduling = assignment and sequencing • Assignment algorithm – won’t test you on this • Sequencing – must know EDD, SPT, FCFS, LCLS, etc.

  35. Sequencing rules FCFS 18.60 9.6 3 23 DDATE 15.00 5.6 3 16 SLACK 16.40 6.8 4 16 CR 20.80 11.2 4 26 SPT 14.80 6.0 3 16 * best values Average Average No. of Maximum Rule Completion Time Tardiness Jobs Tardy Tardiness * * * * * * * * © 2000 by Prentice-Hall Inc Russell/Taylor Oper Mgt 3/e Ch 14 - 24

  36. Terms Sequencing Loading Assigning SPT EDD (DDATE) CR SLACK FCFS (FIFO) LCLS (LIFO)

  37. See you Mon. morning, Mar 25, 8:00 a.m.

More Related