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LDSE Algorithm for Constrained Multi-Objective Optimization with mixed Variables

LDSE Algorithm for Constrained Multi-Objective Optimization ...

The Fourth Across-strait Workshop on Shock Wave/Vortex Interaction(第四届海峡两岸激波/涡相互作用学术交流会)

作者： Changtong Luo Shao-Liang Zhang Department of Computational Science and Engineering Nagoya University Nagoya 464-8603Japan

A bi-level tournament selection method for handling multi-objectives and constraints is provided for low dimensional simplex evolution (LDSE).The idea is general and can apply to other evolutionary algorithms.

关键词： multi-objective optimization evolutionary algorithm genetic algorithm constraints handling mixed-integer programming

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Remanufacturing process planning for IT equipment

Remanufacturing process planning for IT equipment

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Pulsed Power Conference, 2005 IEEE;San Francisco,CA,USA

作者： Stylianos Chiotellis Sebastian Kernbaum Gunther Seliger Institute for Machine Tools and Factory Management Department of Assembly Technology and Factory Management Technical University Berlin Berlin Germany

ISBN: (纸本)9781424422722

We present an approach for the design, evaluation and implementation of remanufacturing processes in a given facility. Based on the description of the market situation and involved actors, a planning method is derived. Data acquisition procedures for product, process and facility are described. Two mixed integer programs are developed;the first one optimizes the remanufacturing process and evaluates its economic viability and the second sequences the remanufacturing tasks. Additionally, the paper describes the technical implementation into a software and the exemplary application on the product category Flat Screen Monitors.

关键词： Remanufacturing Process design Process planning mixed-integer programming

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Solving Infrastructure Monitoring Problems with Multiple Heterogeneous Unmanned Aerial Vehicles 15

Solving Infrastructure Monitoring Problems with Multiple Het...

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International Conference on Autonomous Agents and Multiagent Systems

作者： Jakub Ondracek Ondrej Vanek Michal Pechoucek Agent Technology Center Faculty of Electrical Engineering Czech Technical University

ISBN: (纸本)9781450337717

A number of critical infrastructures, such as gas or oil pipelines operate in a sensitive environment and any damage done to the infrastructure significantly harms the surrounding fauna and flora and poisons water supplies. The infrastructure thus needs to be monitored and any damage or failure has to be detected and reported as quickly as possible. We focus on the enhancement of the monitoring systems - we propose a first holistic solution for a set of heterogeneous unmanned aerial vehicles (UAVs) which monitor the infrastructure under current technological restrictions such as speed, battery endurance and sensing radius. We solve the problem of (1) the allocation of charging/maintenance stations in the area, (2) the assignment of the UAVs to the stations and (3) the computation of their trajectories with respect to the environment sensitivity. We propose a formal graph-based model capturing problem constraints and requirements. We explore possible decompositions of the problem and we propose a number of algorithms allowing to choose between algorithm runtime and solution quality. The results show that our approach can be used to monitor real-world sized infrastructures of a length of tens of kilometers using up to five UAVs.

关键词： Unmanned Aerial Vehicles Critical Infrastructure Protection mixed-integer programming Trajectory Planning

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A MIP Approach to the Yearly Scheduling Problem of a mixed Hydrothermal System

A MIP Approach to the Yearly Scheduling Problem of a Mixed H...

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5th International Conference on the European Electricity Market (EEM 2008), vol.2

作者： Costas G. Baslis Anastasios G. Bakirtzis Department of Electrical and Computer Engineering Aristotle University of Thessaloniki Thessaloniki Greece

This paper presents a mixed-integer optimization approach to the yearly hydrothermal scheduling problem. The proposed method is applied to a hydrothermal system comprising 29 thermal units and 13 hydroplants, including 2 pumped storage plants, similar to the Greek Power System. The generation scheduling model is based on an hourly load curve. Perfect competition assumption is adopted and all thermal generators are assumed to bid their marginal cost. A large mixed-integer programming problem is formulated and implemented in GAMS. Binary variables represent thermal unit hourly commitment status. Results on an hourly basis, including thermal unit commitment and dispatch, hydroplant generation and pumping and system marginal price are presented.

关键词： Hydrothermal scheduling mixed-integer programming Perfect competition

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Simultaneous batching and scheduling of single stage batch plants with parallel units

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AICHE JOURNAL 2008年第1期54卷 183-193页

作者： Castro, Pedro M. Erdirik-Dogan, Muge Grossmann, Ignacio E. Inst Nacl Engn Technol & Inovacao Dept Model & Simulacao Proc P-1649038 Lisbon Portugal Carnegie Mellon Univ Dept Chem Engn Pittsburgh PA 15213 USA

This article deals with the optimal short-term scheduling of single stage batch plants with sequence-dependent changeovers together with the optimal selection of the number of batches to produce. The novelty of the article is that instead of following the traditional approach of considering one processing task per batch, all batches of the product are now aggregated into a single task. integer variables that hold the number of batches to produce are used to characterize these aggregated tasks. Two conceptually different continuous-time models are proposed. They rely on either multiple time grids or global precedence sequencing variables for event representation and generate a mixed integer linear program. The new formulations are compared to a traditional resource-task network multiple time grid approach as well as to a recent bounding model with immediate precedence sequencing variables. The results for several example problems show the new multiple time grid formulation as the best overall performer. When compared to the traditional approach, one order of magnitude savings in computational effort are achieved due to the need of fewer event points to get to the global optimal solutions. (C) 2007 American Institute of Chemical Engineers.

关键词： optimization mathematical modeling mixed-integer programming

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Applying Robust Optimization to MISO Look-Ahead Commitment

Applying Robust Optimization to MISO Look-Ahead Commitment

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IEEE Power and Energy Society General Meeting

作者： Yonghong Chen Qianfan Wang Xing Wang Yongpei Guan Midcontinent Independent System Operator Inc. (MISO) Alstom Grid Department of Industrial and Systems Engineering University of Florida

ISBN: (纸本)9781479964161

Managing uncertainty has been a challenging task for market operations. This paper first reviews the current practice of managing uncertainties at MISO. A framework of using robust optimization based approach on MISO Look-Ahead commitment (LAC) is then introduced. The numerical results show that this type of approaches are promising and yet with challenges to overcome in order to be practical for real world application.

关键词： Uncertainty Look-Ahead Unit Commitment mixed-integer programming Two-Stage Robust Optimization

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Generalized Elastic Flow Rerouting Scheme

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NETWORKS 2015年第4期66卷 267-281页

作者： Fouquet, Yoann Nace, Dritan Pioro, Michal Poss, Michael Zotkiewicz, Mateusz Univ Technol Compiegne Univ Paris 04 CNRS Heudiasyc UMR 7253 F-60203 Compiegne France Warsaw Univ Technol Inst Telecommun PL-00661 Warsaw Poland Lund Univ Dept Elect & Informat Technol S-22100 Lund Sweden Univ Montpellier 2 UMR CNRS LIRMM 5506 F-34392 Montpellier 5 France

The present study deals with Elastic Flow Rerouting (EFR)-an original traffic restoration strategy for protecting traffic flows in communication networks (including wireless networks) against multiple link failures. EFR aims at alleviating the trade-off between practicability of traffic restoration and the cost of network resources observed in existing networking solutions. We present an extension of EFR capable of managingmultiple partial link failures. We describe EFR and its extension, formulate the EFR related optimization problems, and discuss approaches for their resolution. We also discuss numerical results illustrating effectiveness of EFR in terms of the link capacity cost. (c) 2015 Wiley Periodicals, Inc. NETWORKS, Vol. 66(4), 267-281 2015

关键词： survivability traffic restoration mixed-integer programming partial link failures

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Evaluation of Responsive Load Participation in Optimal Satisfying System Security Constraints

Evaluation of Responsive Load Participation in Optimal Satis...

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IEEE Power and Energy Society General Meeting

作者： M. Yazdaninejad M.-R. Haghifam Department of Electrical Engineering Islamic Azad University South-Tehran branch Tehran Iran Department of Electrical and Computer Engineering Tarbiat Modares University Tehran Iran

ISBN: (纸本)9781467327275

With liberalizing electricity market, consumers are incurred more electricity price volatilities. Accordingly, they may present parts of their demand as responsive loads (RLs) with the purpose of reducing the prices and providing favorable reliability level for the system. RLs are identified as resources from demand-side which can participate in reliability-triggered events and/or ancillary services by different demand response (DR) programs. In this paper, RLs take part in Emergency Demand Response Programs (EDRPs) during reliability-triggered events while Demand-Side Ancillary Services Programs (DSASPs) are implemented along with spinning and non-spinning reserves from generation-side to satisfy the system security constraints economically. The Reserve procurement from both sides is carried out by risk curve formed for each bus of system base on the credibility and expected consequences of contingencies and also the responding rate of reserve resources in a short-term stochastic security-constrained unit commitment (SCUC) model. The RBTS and IEEE-RTS are considered to illustrate the effects of participating RLs in the joint energy and reserve market.

关键词： Demand response mixed-integer programming operating reserve requirements stochastic security-constrained unit commitment Ancillary services reserve reliability criteria Demand-Responsive Motor buses Spin LOAD sidings

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A combined optimization-simulation approach for modified outside-in boarding under COVID-19 regulations including limited baggage compartment capacities

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JOURNAL OF AIR TRANSPORT MANAGEMENT 2023年 106卷 102258页

作者： Schultz, Michael Soolaki, Majid Salari, Mostafa Bakhshian, Elnaz Bundeswehr Univ Munich Inst Flight Syst D-85577 Neubiberg Germany Univ Westminster Sch Architecture & Cities London England Univ North Dakota Coll Engn & Mines Dept Civil Engn Grand Forks ND USA Univ Coll Dublin Sch Civil Engn Dublin Ireland

The timely handling of passengers is critical to efficient airport and airline operations. The pandemic requirements mandate adapted process designs and handling procedures to maintain and improve operational performance. Passenger activities in the confined aircraft cabin must be evaluated for potential virus transmission, and boarding procedures should be designed to minimize the negative impact on passengers and operations. In our approach, we generate an optimized seat allocation that considers passengers' physical activities when they store their hand luggage items in the overhead compartment. We proposed a mixed-integer programming formulation including the concept of shedding rates to determine and minimize the risk of virus transmission by solving the NP-hard seat assignment problem. We are improving the already efficient outside-in boarding, where passengers in the window seat board first and passengers in the aisle seat board last, taking into account COVID-19 regulations and the limited capacity of overhead compartments. To demonstrate and evaluate the improvements achieved in aircraft boarding, a stochastic agent-based model is used in which three operational scenarios with seat occupancy of 50%, 66%, and 80% are implemented. With our optimization approach, the average boarding time and the transmission risk are significantly reduced already for the general case, i.e., when no specific boarding order is specified (random boarding). If the already efficient outside-in boarding is used as a reference, the boarding time can be reduced by more than 30% by applying our approach, while keeping the transmission risk at the lowest level.

关键词： Aircraft boarding Passenger seat assignment COVID-19 constraints Hand luggage mixed-integer programming Optimized seat allocation Stochastic agent-based model Simulation

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A bracket assignment problem for the national collegiate athletic association men’s basketball tournament

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International Transactions in Operational Research 2006年第3期13卷 253-271页

作者： Cole Smith, J. Fraticelli, Barbara M. P. Rainwater, Chase Department of Industrial and Systems Engineering University of Florida Gainesville FL 32611 United States Grado Department of Industrial and Systems Engineering Virginia Polytechnic Institute and State University Blacksburg VA 24061 United States

The National Collegiate Athletic Association Men’s Basketball Tournament is a 65-team championship in American college basketball, in which a single team is eliminated in a play-in game, followed by a six-round, single-elimination tournament. Owing to its immense popularity, each aspect of the tournament, including the selection of teams, their ranking (or “seeding”), and the assignment of teams to locations for the first few rounds, is a hotly debated topic. In this paper, we concentrate on the latter aspect of the tournament composition, as the first two elements have been extensively researched in a variety of settings. We formulate the team assignment problem as a mixed-integer program, and examine various methods of tightening the linear programming relaxation in order to yield an effective methodology for generating feasible tournament pairings with minimum expected travel. Finally, we demonstrate the results of our algorithm on data derived from the 2004 and 2005 basketball tournaments. © 2006 Wiley Periodicals, Inc.

关键词： mixed-integer programming Sports in operations research Three-dimensional assignment Valid inequalities

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