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About AS/RS (1/7)

About AS/RS (1/7). About AS/RS (2/7). Research areas Storage locations assignment Storage and retrieval policy Physical design. About AS/RS (3/7). Storage locations assignment Randomized Uniformly Closest open location Class-based Turnover ratio Dedicated. About AS/RS (4/7).

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About AS/RS (1/7)

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  1. About AS/RS (1/7)

  2. About AS/RS (2/7) • Research areas • Storage locations assignment • Storage and retrieval policy • Physical design

  3. About AS/RS (3/7) • Storage locations assignment • Randomized • Uniformly • Closest open location • Class-based • Turnover ratio • Dedicated

  4. About AS/RS (4/7) • Storage and retrieval policy • Single command (SC) • First-come-first-serve • Dual command (DC) • First-come-first-serve • Dynamic TSP problem • Assignment problem (static & dynamic) • Nearest neighbor

  5. About AS/RS (5/7) • Physical design • Configurations of rack • Height & Length • Velocity • Acceleration & Deceleration • Dwell point • Bozer & White(1984) • E(SC)=[ ] T • E(DC)=[ ] T

  6. About AS/RS (6/7) • Performance measure • Travel time • Throughout

  7. About AS/RS (7/7) • Load types • Mini-load • Unit-load

  8. Effects of relocation to AS/RS storage location policy with production quantity variation

  9. Introduction • Experiment design • Simulation • Result • Conclusion

  10. Introduction • The performance of will not be good if production quantity variation and current storage policy is kept • Find the tolerance limits and appropriate strategies for storage policy when production plan change • Random,2 and 3 class-based will be examined

  11. Experiment design (1/3) • There are 20 items in the production plan • Production quantities vary between 10-80% • Items are assumed as end products • For 2 class-based storage • Top four items: first class

  12. Experiment design (2/3) • For 3 class-based storage • Top four items: first class • Next six items: second class • For random storage • 1500, 5000 and 95000 unit storage time • Relocation process will be done whenever the crane idles

  13. Experiment design (3/3)

  14. Simulation (1/4) • GPSS • Simulated for 900,000 unit time • Warn up 300,000 • 300,000~600,000 unit time: original • Repeat 10 times

  15. Simulation (2/4)

  16. Simulation (3/4)

  17. Simulation (4/4)

  18. Result (1/3) • Random storage

  19. Result (2/3) • 2 class-based

  20. Result (3/3) • 3 class-based

  21. Result(4/4)

  22. Conclusion (1/2)

  23. Conclusion (2/2) • Class-based storage policies perform better but have a lower tolerance • Class-based would be better if performance is the most critical issue • If performance is not critical and frequent production plan changes are expected, random storage would be better

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