Stochastic Modeling

Download Lectures on Stochastic Programming: Modeling and Theory by Alexander Shapiro PDF

By Alexander Shapiro

Optimization difficulties regarding stochastic versions ensue in just about all components of technological know-how and engineering, resembling telecommunications, drugs, and finance. Their life compels a necessity for rigorous methods of formulating, examining, and fixing such difficulties. This publication specializes in optimization difficulties concerning doubtful parameters and covers the theoretical foundations and up to date advances in parts the place stochastic types can be found.

Readers will locate assurance of the fundamental suggestions of modeling those difficulties, together with recourse activities and the nonanticipativity precept. The publication additionally contains the speculation of two-stage and multistage stochastic programming difficulties; the present nation of the idea on probability (probabilistic) constraints, together with the constitution of the issues, optimality conception, and duality; and statistical inference in and risk-averse techniques to stochastic programming.

Audience: This booklet is meant for researchers engaged on idea and purposes of optimization. It is also appropriate as a textual content for complicated graduate classes in optimization.

Contents: Preface; bankruptcy 1: Stochastic Programming versions; bankruptcy 2: Two-Stage difficulties; bankruptcy three: Multistage difficulties; bankruptcy four: Optimization types with Probabilistic Constraints; bankruptcy five: Statistical Inference; bankruptcy 6: danger Averse Optimization; bankruptcy 7: heritage fabric; bankruptcy eight: Bibliographical comments; Bibliography; Index.

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T (ω)x + W (ω)y = h(ω), γj (ω) + qj (ω)T y ≤ v, dk (ω) y ≤ rk (ω), T j = 1, . . , J2 , k = 1, . . , K2 . 2) have to be redefined in an appropriate way. In order to avoid all these manipulations and unnecessary notational complications that come with such a conversion, we shall address polyhedral problems in a more abstract way. This will also help us to deal with multistage problems and general convex problems. 45): L(y, π; x, ω) := f2 (y, ω) + π T h(ω) − T (ω)x − W (ω)y . We have inf L(y, π ; x, ω) = π T h(ω) − T (ω)x + inf f2 (y, ω) − π T W (ω)y y y = π h(ω) − T (ω)x − f2∗ (W (ω)T π, ω), T where f2∗ (·, ω) is the conjugate7 of f2 (·, ω).

45) can be written as Max π T h(ω) − T (ω)x − f2∗ (W (ω)T π, ω) . 46). 46). 2. 7 Note that since f2 (·, ω) is polyhedral, so is f2∗ (·, ω). ✐ ✐ ✐ ✐ ✐ ✐ ✐ 44 SPbook 2009/8/20 page 44 ✐ Chapter 2. 14. Let ω ∈ be given and suppose that Q(·, ω) is finite in at least one point x. ¯ Then the function Q(·, ω) is polyhedral (and hence convex). Moreover, Q(·, ω) is subdifferentiable at every x at which the value Q(x, ω) is finite, and ∂Q(x, ω) = −T (ω)T D(x, ω). 47) Proof. Let us define the function ψ(π ) := f2∗ (W T π ).

22)). 6. 1 in the case when all demand has to be satisfied, by making additional orders of the missing parts. In this case, the cost of each additionally ordered part j is rj > cj . Formulate the problem as a linear two-stage stochastic programming problem. 7. 3 in the case when all demand has to be satisfied, by backlogging the excessive demand, if necessary. In this case, it costs bi to delay delivery of a unit of product i by one period. Additional orders of the missing parts can be made after the last demand DT becomes known.

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