Results 1 to 10 of about 3,712,066 (178)

An application of Markowitz theorem on Tehran Stock Exchange [PDF]

open access: yesManagement Science Letters, 2014
During the past 65 years, there have been tremendous efforts on portfolio selection problem. The standard Markowitz mean–variance model to portfolio selection includes tracing out an efficient frontier, a continuous curve demonstrating the tradeoff ...
Hassan Ghodrati, Mohammad Abbasi
doaj   +1 more source

Mixed integer programming with a class of nonlinear convex constraints

open access: yesDiscrete Optimization, 2017
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Alexander Vinel, Pavlo A. Krokhmal
openaire   +3 more sources

A Joint Inventory and Transport Capacity Problem With Carbon Emissions

open access: yesIEEE Access, 2020
This paper considers an inventory system consisting of one supplier and one retailer, and studies a joint inventory policy and transport capacity decision for this inventory system with carbon emissions.
Zhengyi Li, Jiangtao Hai
doaj   +1 more source

Optimization of load sharing for parallel compressors using a novel hybrid intelligent algorithm

open access: yesEnergy Science & Engineering, 2021
Compressor stations, which usually consist of multiple compressors in parallel, are installed to power natural gas travel in pipelines. Compressor station optimization, which should be expressed as a mixed integer nonlinear programming (MINLP) problem ...
Xia Li, Tao Cui, Kun Huang, Xin Ma
doaj   +1 more source

Constrained optimization with integer and continuous variables using inexact restoration and projected gradients

open access: yesBulletin of Computational Applied Mathematics, 2016
Inexact restoration (IR) is a well established technique for continuous minimization problems with constraints that can be applied to constrained optimization problems with specific structures.
Ernesto G. Birgin   +2 more
doaj  

An MI-SDP Model for Optimal Location and Sizing of Distributed Generators in DC Grids That Guarantees the Global Optimum

open access: yesApplied Sciences, 2020
This paper deals with a classical problem in power system analysis regarding the optimal location and sizing of distributed generators (DGs) in direct current (DC) distribution networks using the mathematical optimization.
Walter Gil-González   +3 more
doaj   +1 more source

Applications and algorithms for mixed integer nonlinear programming

open access: yesJournal of Physics: Conference Series, 2009
The mathematical modeling of systems often requires the use of both nonlinear and discrete components. Discrete decision variables model dichotomies, discontinuities, and general logical relationships. Nonlinear functions are required to accurately represent physical properties such as pressure, stress, temperature, and equilibrium.
Sven Leyffer   +4 more
openaire   +1 more source

Day-Ahead Coordinated Reactive Power Optimization Dispatching Based on Semidefinite Programming

open access: yesEnergies
With access to new energy sources, the problem of reactive power optimization and dispatching has become increasingly important for research. However, the reactive power optimization problem is a mixed integer nonlinear optimization problem.
Binbin Xu   +7 more
doaj   +1 more source

A Group Rotate-Vector Algorithm for Mixed-Variable Optimization Problems

open access: yesIEEE Access
Many engineering design optimization problems can be represented as mixed-variable optimization problems. This study presents a heuristic approach for solving mixed-variable optimization using rotation and contraction of vectors. The current optimization
Zhongming Li   +3 more
doaj   +1 more source

Multistage Expansion Co-Planning of Integrated Natural Gas and Electricity Distribution Systems

open access: yesEnergies, 2019
This paper focuses on expansion co-planning studies of natural gas and electricity distribution systems. The aim is to develop a mixed-integer linear programming (MILP) model for such problems to guarantee the finite convergence to optimality.
Mohammad Jooshaki   +4 more
doaj   +1 more source

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