trans_sys_chap12

Trans_sys_chap12 - Introduction to Transportation Systems 1 PART II FREIGHT TRANSPORTATION 2 Chapter 12 The Logistics System and Freight

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Introduction to Transportation Systems 1
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PART II: FREIGHT TRANSPORTATION 2
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Chapter 12: The Logistics System and Freight Level-of-Service 3
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Freight Outline ± Freight level-of-service -- the inventory model ± Freight modes ± Rail ± Truck ± Ship ± Intermodal/International ± Summary -- commonalities and differences 4
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The Logistics Model: An Umbrella Store ± Ordering ± Transportation Costs ± Storage 5
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Deterministic Use Rate and Delivery Time In-Store Inventory vs. Time Inventory 4 0 1 2 Time (Days) Order 4 Order 4 Order 4 Goods Arrive Goods Arrive Figure 12.2 6
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In-Transit Inventory Pipeline In-Transit Inventory 4 umbrellas Time Figure 12.3 7
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In-Transit Order Pipeline, but with Longer Delivery Time Order Pipeline In-Transit Inventory Arrival of Day 0 Order 8 umbrellas Arrival of Day 1 Order Day 0 + Day 1 orders in pipeline Day 1 + Day 2 orders in pipeline Time Inventory Day 0 Day 1 Day 2 Day 3 Order Order Order Order Figure 12.4 8
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A New, Faster Mode ± Suppose a new premium transportation mode became available that allowed you to go from this new supplier to your retail outlet in one day, rather than two days. ± Your inventory costs would be reduced. Your pipeline is now only one day long, rather than two days long, which has value to you. ± And you would compare this value with the price that you were being charged for using this high-speed premium mode. 9
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Unreliable Transportation Mode Probability mode works on a given day Figure 12.5 0.7 0.3 Mode Works Mode Doesn’t Work 10
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Probability of Time until Delivery P(t=N) 0.21 0.063 0.7 . . . . . . . . . . 3 days 2 For umbrellas ordered on Day 0, probability of arrival on a given day. 11
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This note was uploaded on 12/06/2011 for the course ESD 1.221j taught by Professor Josephsussman during the Fall '04 term at MIT.

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Trans_sys_chap12 - Introduction to Transportation Systems 1 PART II FREIGHT TRANSPORTATION 2 Chapter 12 The Logistics System and Freight

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