Journal: Investigao Operacional

Found 215 papers in total
Optimization of quantitative relationship in animal science
Optimization of quantitative relationship in animal science
1997,
A mathematical approach for optimization of a given factors-production empirical...
Calendar effects in the sales of gasoline
Calendar effects in the sales of gasoline
1997,
The general behaviour of the gasoline sales contains calendar effects due to changing...
Design of multipurpose batch plants with operational pre-conditions
Design of multipurpose batch plants with operational pre-conditions
1997,
A formulation is presented for the optimal selection of both the equipment units and...
A multicriteria approach for the construction of a ‘costs matrix’ of an assignment model for stand aircraft management
A multicriteria approach for the construction of a ‘costs matrix’ of an assignment model for stand aircraft management
1997,
One of the daily operational tasks, in any airport, is the assignment of a stand to...
A standard genetic algorithm for clustering with precedence constraints
A standard genetic algorithm for clustering with precedence constraints
1997,
Our paper reports on the clustering of N items into a maximum of M non-overlapping...
A multiplier vector substitution technique based on pseudo-derivatives
A multiplier vector substitution technique based on pseudo-derivatives
1997,
An exact penalty technique based on an augmented Lagrangian function is used for...
Are ISO 9000 Quality Systems compatible with TQM?
Are ISO 9000 Quality Systems compatible with TQM?
1997,
The implementation of the ISO 9000 standards is increasing significantly all over the...
Development of gravitational models for gasoline sales
Development of gravitational models for gasoline sales
1997,
This paper describes the development of models for the sales of liquid fuels in...
A bond portfolio optimization model
A bond portfolio optimization model
1997,
The Portuguese financial market has been putting tremendous effort into creating a...
Probabilistic analysis of seismic hazard in Portugal
Probabilistic analysis of seismic hazard in Portugal
1997,
In this paper probabilistic models to be applied to seismic hazard analysis in...
Assessing the influence of initial conditions in a simulation model of the seismic process of occurrences in the Iberian Peninsula
Assessing the influence of initial conditions in a simulation model of the seismic process of occurrences in the Iberian Peninsula
1997,
In this paper we present an analysis of the initial conditions of a seismic simulation...
A comparison between line searches and trust regions for nonliner optimization
A comparison between line searches and trust regions for nonliner optimization
1996,
Line searches and trust regions are two techniques to globalize nonlinear optimization...
A comparative analysis of models for the Traveling Salesman Problem
A comparative analysis of models for the Traveling Salesman Problem
1996,
Several formulations for the Traveling Salesman Problem are compared with respect to...
Parallel processing and multicriteria decision aid: Some computational experiments
Parallel processing and multicriteria decision aid: Some computational experiments
1996,
As parallel computers become more popular and affordable, they have begun to be used...
Queueing and quality service
Queueing and quality service
1996,
This paper develops methodology that provides a way of incorporating quality...
Applying metaheuristics to single machine scheduling problems
Applying metaheuristics to single machine scheduling problems
1996,
In this paper, the authors describe some general features of single-machine scheduling...
A decision support system for production scheduling in the printing industry
A decision support system for production scheduling in the printing industry
1996,
In this paper it is described a Decision Support System (DSS) designed to support the...
Comparative study of traffic assignment algorithms
Comparative study of traffic assignment algorithms
1996,
An important problem in traffic planning occurs when trying to devise efficient...
Optimal control of discrete systems: Recent results and case studies
Optimal control of discrete systems: Recent results and case studies
1996,
The paper has two main purposes: to give an introduction to some fundamental results...
The M/D/ queue busy period
The M/D/ queue busy period
1996,
The busy period of the M/D/ system is intensively studied as a particular case of the...
An O.R. model for safety at work
An O.R. model for safety at work
1996,
This article has as its main goal, to show the possibility of using an Operational...
Teaching Systems Modelling at FCT-UNL, Portugal
Teaching Systems Modelling at FCT-UNL, Portugal
1996,
Systems Modelling is a very important area of Operational Research and Systems...
Forecasting horiticultural prices: A comparison of methods
Forecasting horiticultural prices: A comparison of methods
1996,
Forecasts of horticultural prices provide useful information for farmers and...
A sales forecasting model for food retailing
A sales forecasting model for food retailing
1996,
This paper presents a forecasting model for the daily sales of a food retailing chain...
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