Journal: Investigao Operacional

Found 215 papers in total
A contribution of the ELECTRE TRI method to the classification of industrial risk
A contribution of the ELECTRE TRI method to the classification of industrial risk
2007,
Risk classification is a relevant problem in industrial context. The complexity of...
Partial productivity ordinal aggregation: A case study with family farmers
Partial productivity ordinal aggregation: A case study with family farmers
2007,
Productivity is the most usual indicator to measure agricultural performance. In this...
Hard validation of soft OR methodologies
Hard validation of soft OR methodologies
2008,
In order to subsist and be successful in this environment with greater complexity and...
Some rankings for the Athens Olympic Games using DEA models with a constant input
Some rankings for the Athens Olympic Games using DEA models with a constant input
2008,
There is no official method to establish a final ranking for the Olympic games. The...
Optimal pricing and ordering policies for deteriorating items under a progressive trade credit scheme
Optimal pricing and ordering policies for deteriorating items under a progressive trade credit scheme
2008,
In this paper, a mathematical model is developed to formulate optimal pricing and...
Dynamic location problems with discrete expansion and reduction sizes of available capacities
Dynamic location problems with discrete expansion and reduction sizes of available capacities
2007,
In this paper a dynamic location problem is formulated that considers the possibility...
Optimal design of a bulk service queue
Optimal design of a bulk service queue
2007,
This paper uses a control–theoretic approach, the so–called predictive...
Fraud detection in energy distribution using support vector machines
Fraud detection in energy distribution using support vector machines
2007,
Several economics sectors are exposed to fraud made by their own customers. At the...
Electricity price forecasting through artificial neural networks
Electricity price forecasting through artificial neural networks
2007,
In this paper, a computational tool based on artificial neural networks is presented...
Comparing the principal components analysis to the CATPCA in the passenger's satisfaction
Comparing the principal components analysis to the CATPCA in the passenger's satisfaction
2007,
The main purpose of this article is to confront the results of the Principal...
Positive mathematical programming: An instrument for calibration and prescription of agricultural supply models
Positive mathematical programming: An instrument for calibration and prescription of agricultural supply models
2008,
In this paper, calibration and prescription capacity of different types of positive...
Exact penalty methods for nonlinear optimization problems
Exact penalty methods for nonlinear optimization problems
2008,
In this work we present a classification of some of the existing Penalty Methods...
Initial electronic spare parts stock and consumption forecasting
Initial electronic spare parts stock and consumption forecasting
2008,
There is a consensus that conventional continuous demand distribution methods are not...
Computational experiments with flow models for multicommmodity using non linear and non-separable cost functions
Computational experiments with flow models for multicommmodity using non linear and non-separable cost functions
2007,
In this paper we present the study and the numerical implementation of the...
Potential Energy Minimization of Nonlinear Structural Systems: a comparison of numerical algorithms for nonlinear programming
Potential Energy Minimization of Nonlinear Structural Systems: a comparison of numerical algorithms for nonlinear programming
2007,
The main aim of the present work is to develop a formulation and some strategies for...
Long-term non-linear model for the power requirement of the Brazilian electricity system
Long-term non-linear model for the power requirement of the Brazilian electricity system
2007,
The formerly closed Brazilian electrical energy market has been disclosed for...
Variables selection in Data Envelopment Analysis applied to an analysis of the electric energy market
Variables selection in Data Envelopment Analysis applied to an analysis of the electric energy market
2007,
In this paper we have two main goals. From a theoretical point of view we intend to...
Optimal scheduling of hydro power systems considering the head change effect
Optimal scheduling of hydro power systems considering the head change effect
2007,
This paper focuses on the optimal scheduling of hydro power systems. A new methodology...
Optimal scheduling of thermal power systems considering emission constraints
Optimal scheduling of thermal power systems considering emission constraints
2006,
This paper focuses on the optimal scheduling of thermal power systems. A new...
Latent variable scores: An option for customer satisfaction index of Brazilian Electricity Regulatory Agency
Latent variable scores: An option for customer satisfaction index of Brazilian Electricity Regulatory Agency
2006,
Structural Equation Models with unobservable variables and measurement error have been...
Utilization of Monte Carlo Simulation and Threshold Curve to Value American Put Options
Utilization of Monte Carlo Simulation and Threshold Curve to Value American Put Options
2007,
In 1973 Black and Scholes published their article on the valuation of European option....
An approximate solution classification model through optimization techniques
An approximate solution classification model through optimization techniques
2006,
In this work we consider the problem about classification of objects (products,...
The variation in seismic activity throughout the year in the Iberian Peninsula
The variation in seismic activity throughout the year in the Iberian Peninsula
2006,
The objective is to research on the existence of a significant variation in the number...
Branch and price algorithms for production lot sizing
Branch and price algorithms for production lot sizing
2006,
In this paper, we present two algorithms for the multi-item capacitated lot-sizing...
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