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Chance Constrained Programs and Distributionally Favorable Optimization
Chance Constrained Programs and Distributionally Favorable Optimization
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105549
- ISBN
- 9798265404893
- DDC
- 658
- 저자명
- Jiang, Nan.
- 서명/저자
- Chance Constrained Programs and Distributionally Favorable Optimization
- 발행사항
- [Sl] : Georgia Institute of Technology, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 298 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Xie, Weijun.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
- 초록/해제
- 요약This dissertation addresses theoretical and computational challenges in solving chance constrained programs (CCPs), which seek optimal decisions that meet uncertain constraints within a specified risk level. Two main approaches to these challenges are: (i) developing convex inner approximations for CCPs, and (ii) solving CCPs to optimality. This dissertation improves these approaches by developing new convex approximations and creating a framework for efficient optimality cuts. In addition, it introduces a novel distributionally favorable optimization (DFO) framework to mitigate the impact of outliers in decision-making under uncertainty. Unlike traditional distributionally robust optimization (DRO) frameworks, which often overemphasize outliers, the DFO framework considers the best-case expected recourse function under the most favorable distribution, thereby reducing the adverse impact of outliers and recovering robust statistics.The first part of this dissertation (Chapters 2 and 3) focuses on advancing the existing knowledge of chance constrained programs. We first study and generalize ALSO-X, originally proposed by Ahmed, Luedtke, SOng, and Xie in 2017, to solve a CCP. We show that when uncertain constraints are convex in the decision variables, ALSO-X always outperforms the CVaR approximation. We further show (i) sufficient conditions under which ALSO-X can recover an optimal solution to a CCP; (ii) an equivalent bilinear programming formulation of a CCP, inspiring us to enhance ALSO-X with a convergent alternating minimization method (ALSO-X+); (iii) an extension of ALSO-X and ALSO-X+ to solve distributionally robust chance constrained programs (DRCCPs) under ∞−Wasserstein ambiguity set. While existing methods have predominantly focused on either inner or outer approximations, we aim to bridge the gap by studying a scheme that effectively combines these approximations via variable fixing. By checking the restricted outer approximations and comparing them with the inner approximations, we derive optimality cuts that can significantly reduce the number of binary variables by effectively setting them to either one or zero. We perform a theoretical analysis of variable fixing techniques, deriving an asymptotic closed-form expression. This expression quantifies the proportion of binary variables that should be optimally fixed to zero. Our empirical results showcase the advantages of our approach, both in terms of computational efficiency and solution quality. Notably, we solve all the test instances from literature to optimality, signifying the robustness and effectiveness of our proposed approach.In the second part (Chapters 4 and 5) of this dissertation, we propose a novel distributionally favorable optimization (DFO) framework to mitigate the effect of outliers for decision-making under uncertainty. When outliers cause extremely large or even infinite recourse function values, the commonly used distributionally robust optimization (DRO) framework often emphasizes these outliers, resulting in undesirable or infeasible decisions. In contrast, our proposed DFO framework considers the best-case expected recourse function under the most favorable distribution from the distributional family. In this way, we show that DFO could find a proper measure of the stochastic recourse function and reduce the effect of outliers. We also show that DFO recovers many robust statistics, suggesting that the DFO framework can provide appropriate decisions in the presence of outliers. In contrast to the traditional DRO paradigm, DFO presents a unique challenge- the application of the inner infimum operator often fails to retain the convexity. In light of this challenge, we study the tractability and complexity of DFO. We establish sufficient and necessary conditions for determining when DFO problems are tractable or intractable. Despite the typical nonconvex nature of DFO problems, our findings show that they are mixed-integer convex programming representable (MICP-R), thereby enabling solutions via standard optimization solvers.
- 일반주제명
- Decision making
- 일반주제명
- Industrial engineering
- 일반주제명
- Systems science
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798265404893
■035 ▼a(MiAaPQ)AAI32315677
■035 ▼a(MiAaPQ)GeorgiaTech75695
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a658
■1001 ▼aJiang, Nan.
■24510▼aChance Constrained Programs and Distributionally Favorable Optimization
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a298 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Xie, Weijun.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2024.
■520 ▼aThis dissertation addresses theoretical and computational challenges in solving chance constrained programs (CCPs), which seek optimal decisions that meet uncertain constraints within a specified risk level. Two main approaches to these challenges are: (i) developing convex inner approximations for CCPs, and (ii) solving CCPs to optimality. This dissertation improves these approaches by developing new convex approximations and creating a framework for efficient optimality cuts. In addition, it introduces a novel distributionally favorable optimization (DFO) framework to mitigate the impact of outliers in decision-making under uncertainty. Unlike traditional distributionally robust optimization (DRO) frameworks, which often overemphasize outliers, the DFO framework considers the best-case expected recourse function under the most favorable distribution, thereby reducing the adverse impact of outliers and recovering robust statistics.The first part of this dissertation (Chapters 2 and 3) focuses on advancing the existing knowledge of chance constrained programs. We first study and generalize ALSO-X, originally proposed by Ahmed, Luedtke, SOng, and Xie in 2017, to solve a CCP. We show that when uncertain constraints are convex in the decision variables, ALSO-X always outperforms the CVaR approximation. We further show (i) sufficient conditions under which ALSO-X can recover an optimal solution to a CCP; (ii) an equivalent bilinear programming formulation of a CCP, inspiring us to enhance ALSO-X with a convergent alternating minimization method (ALSO-X+); (iii) an extension of ALSO-X and ALSO-X+ to solve distributionally robust chance constrained programs (DRCCPs) under ∞−Wasserstein ambiguity set. While existing methods have predominantly focused on either inner or outer approximations, we aim to bridge the gap by studying a scheme that effectively combines these approximations via variable fixing. By checking the restricted outer approximations and comparing them with the inner approximations, we derive optimality cuts that can significantly reduce the number of binary variables by effectively setting them to either one or zero. We perform a theoretical analysis of variable fixing techniques, deriving an asymptotic closed-form expression. This expression quantifies the proportion of binary variables that should be optimally fixed to zero. Our empirical results showcase the advantages of our approach, both in terms of computational efficiency and solution quality. Notably, we solve all the test instances from literature to optimality, signifying the robustness and effectiveness of our proposed approach.In the second part (Chapters 4 and 5) of this dissertation, we propose a novel distributionally favorable optimization (DFO) framework to mitigate the effect of outliers for decision-making under uncertainty. When outliers cause extremely large or even infinite recourse function values, the commonly used distributionally robust optimization (DRO) framework often emphasizes these outliers, resulting in undesirable or infeasible decisions. In contrast, our proposed DFO framework considers the best-case expected recourse function under the most favorable distribution from the distributional family. In this way, we show that DFO could find a proper measure of the stochastic recourse function and reduce the effect of outliers. We also show that DFO recovers many robust statistics, suggesting that the DFO framework can provide appropriate decisions in the presence of outliers. In contrast to the traditional DRO paradigm, DFO presents a unique challenge- the application of the inner infimum operator often fails to retain the convexity. In light of this challenge, we study the tractability and complexity of DFO. We establish sufficient and necessary conditions for determining when DFO problems are tractable or intractable. Despite the typical nonconvex nature of DFO problems, our findings show that they are mixed-integer convex programming representable (MICP-R), thereby enabling solutions via standard optimization solvers.
■590 ▼aSchool code: 0078.
■650 4▼aDecision making
■650 4▼aIndustrial engineering
■650 4▼aSystems science
■653 ▼aDistributionally favorable optimization
■653 ▼aChance constrained programs
■690 ▼a0546
■690 ▼a0790
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360579▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


