How Long to Read Composite Variable Formulations for Express Shipment Service Network Design

How Long Does it Take to Read Composite Variable Formulations for Express Shipment Service Network Design?

It takes the average reader 3 hours and 14 minutes to read Composite Variable Formulations for Express Shipment Service Network Design by Andrew Paul Armacost

Assuming a reading speed of 250 words per minute. Learn more

Description

In this thesis, we consider large-scale network design problems, specifically the problem of designing the air network of an express shipment (i. e., overnight) delivery operation. We focus on simultaneously determining the route structure, the assignment of fleet types to routes, and the flow of packages on aircraft. Traditional formulations for network design involve modeling both flow decisions and design decisions explicitly. The bounds provided by their linear programming relaxations are often weak. Common solution strategies strengthen the bounds by adding cuts, but the shear size of the express shipment problem results in models that are intractable. To overcome this shortcoming, we introduce a new modeling approach that 1) removes the flow variables as explicit decisions and embeds them within the design variables and 2) combines the design variables into composite variables, which represent the selection of multiple aircraft routes that cover the demands for some subset of commodities. The resulting composite variable formulation provides tighter bounds and enables very good solutions to be found quickly. We apply this type of formulation to the express shipment operations of the United Parcel Service (UPS). Compared with existing plans, the model produces a solution that reduces the number of required aircraft by almost 11 percent and total annual cost by almost 25 percent. This translates to potential annual savings in the hundreds of millions of dollars.

How long is Composite Variable Formulations for Express Shipment Service Network Design?

Composite Variable Formulations for Express Shipment Service Network Design by Andrew Paul Armacost is 188 pages long, and a total of 48,504 words.

This makes it 63% the length of the average book. It also has 59% more words than the average book.

How Long Does it Take to Read Composite Variable Formulations for Express Shipment Service Network Design Aloud?

The average oral reading speed is 183 words per minute. This means it takes 4 hours and 25 minutes to read Composite Variable Formulations for Express Shipment Service Network Design aloud.

What Reading Level is Composite Variable Formulations for Express Shipment Service Network Design?

Composite Variable Formulations for Express Shipment Service Network Design is suitable for students ages 10 and up.

Note that there may be other factors that effect this rating besides length that are not factored in on this page. This may include things like complex language or sensitive topics not suitable for students of certain ages.

When deciding what to show young students always use your best judgement and consult a professional.

Where Can I Buy Composite Variable Formulations for Express Shipment Service Network Design?

Composite Variable Formulations for Express Shipment Service Network Design by Andrew Paul Armacost is sold by several retailers and bookshops. However, Read Time works with Amazon to provide an easier way to purchase books.

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