scholarly journals Multicriteria analysis for choosing wastewater sewerage solutions

2002 ◽  
Vol 4 (3) ◽  
pp. 137-144 ◽  
Author(s):  
Jérôme Le Gouévec ◽  
Olivier Blanpain
Keyword(s):  
Decision Making ◽  
Expert Systems ◽  
Critical Point ◽  
Multicriteria Analysis ◽  
Point Of View ◽  
Design Phase ◽  
Reasoning Process ◽  
General Management ◽  
New Formulation ◽  
Decision Making Support

Today, more and more French communities have a critical point of view concerning the performance of their wastewater sewerage systems. The main reason is linked to the methodology of the studies in the design phase. The process is neither adapted to the complexity of the decision-making task, nor to a general management of the wastewater sewerage in a territory. In order to make these studies more coherent and the choices more rational, we propose a new formulation of the methodology as an alternative to the current one. Our approach relies on decision-making support which borrows concepts from expert systems and multicriteria analysis in order to structure the reasoning process and to take into account the very different criteria a real decision-making task often implies. We show that this support has to be interactive and iterative in order to ensure that coherent and relevant solutions are chosen.

A Proposed Methodology for the Technoeconomic Evaluation of Energy Efficiency Retrofits: A Bulk Carrier Case Study

2016 ◽  
Vol 32 (02) ◽  
pp. 130-137
Author(s):  
Angelos Tsereklas-Zafeirakis ◽  
Konstantin Aravossis ◽  
George Gougoulidis ◽  
Yanna Pavlopoulou
Keyword(s):  
Decision Making ◽  
Energy Efficiency ◽  
Multicriteria Analysis ◽  
Management Plan ◽  
Point Of View ◽  
Management Tool ◽  
Decision Making Process ◽  
Bulk Carrier ◽  
Near Future ◽  
Technoeconomic Evaluation

In light of the International Maritime Organization (IMO) directives on climate change and the continuous effort of shipping companies to reduce operating costs, this article proposes a methodology for the technoeconomic evaluation of energy efficiency retrofits. The aim of this article is to provide a management tool able to support the decision-making process of investing in energy efficiency methods. The introductory part briefly discusses the environmental problem caused by the gaseous pollutants as well as the regulatory framework that is going to seriously affect the bunker pricing in the near future. In the main part, a series of energy efficiency retrofits, suggested by IMO in the Ship Energy Efficiency Management Plan Annex, are presented with a view to applying them on a bulk carrier. The analysis focuses on the evaluation of these retrofits as potential investments from an owner's strategic point of view. The assessment takes into account major uncertainties of the data used through Monte Carlo simulations and conducts multicriteria analysis to include also nonfinancial criteria in the decision-making process.

scholarly journals Distribution of Time Interval between the Modifications of Result Sets Cardinalities in Random Databases

2013 ◽  
Vol 21 (3) ◽  
pp. 295-306
Author(s):  
Letitia Velcescu
Keyword(s):  
Decision Making ◽  
Probability Distribution ◽  
Point Of View ◽  
Time Interval ◽  
Database Optimization ◽  
Modeling Uncertainty ◽  
Software Programs ◽  
Random Database ◽  
Decision Making Support

AbstractIn this paper, we propose a method to estimate the probability distribution of the time interval which ellapses between the modifications of the cardinality in a random database query’s result set. This type of database is important either in modeling uncertainty or storing data whose values follow a probability distribution. The result that we introduce is important from the point of view of the database optimization, providing a useful method for an integrated module. In previous research on random databases the sizes of some relational operations results were investigated. This kind of information is rather useful in an analytical database which provides decision-making support. The result we particularly aim to present in this paper concerns the transactional random databases, addressing its specific functionality. It will be proven that the interval of time between the cardinalities changes is exponentially distributed. The proof is based on the technique of the Markovian Jelinski-Moranda model, which is used in the reliability of software programs.

scholarly journals On the definition of Landau constants in amplitude equations away from a critical point

2018 ◽  
Vol 5 (11) ◽  
pp. 180746 ◽  
Author(s):  
Khanh Gia Pham ◽  
Sergey A. Suslov
Keyword(s):  
Critical Point ◽  
Basic Flow ◽  
Point Of View ◽  
Nonlinear Stability Analysis ◽  
Weakly Nonlinear ◽  
Finite Distance ◽  
Full Solution ◽  
Definition Of ◽  
Low Dimensional ◽  
New Formulation

A weakly nonlinear stability analysis of shear flows based on amplitude expansion is re-examined. While it has been known that the condition required to define the coefficients of the resulting Stuart–Landau series representing the nonlinear temporal evolution of the most amplified Fourier component of a disturbance is not unique, we show that it can be formulated in a flexible generic form that incorporates different conditions used by various authors previously. The new formulation is interpreted from the point of view of low-dimensional projection of a full solution of a problem onto the space spanned by the basic flow vector and the eigenvector of the linearized problem. It is rigorously proven that the generalized condition formulated in this work reduces to a standard solvability condition at the critical point, where the basic flow first becomes unstable with respect to infinitesimal disturbances, and that it results in a well-posed problem for the determination of coefficients of Stuart–Landau series both at the critical point and a finite distance away from it. On a practical side, the generalized condition reported here enables one to choose the projection in such a way that the resulting low-dimensional approximate solution emphasizes specific physical features of interest via selecting the appropriate projection weight matrix without changing the overall asymptotic expansion procedure.

scholarly journals Critical assessment of paradigms in the study of decision making on sport

2019 ◽  
Vol 3 (3) ◽  
pp. 17-24
Author(s):  
Amaya Castillo Caurel ◽  
José Ignacio Ruiz Sánchez
Keyword(s):  
Complex System ◽  
Decision Making ◽  
Critical Point ◽  
Decision Process ◽  
Critical Assessment ◽  
Point Of View ◽  
Decision Making Process ◽  
Sports Performance ◽  
Vital Importance ◽  
Object Of Study

In this critical assessment of the decision-making process in sport some ideas are clarified around an issue addressed in recent times. To this end, different perspectives are addressed: cognitive paradigm and ecological paradigm with the intention of referring, from a critical point of view, both to their convergences and to their theoretical divergences. A critical assessment is made on their object of study, the theories on which they are based, as well as the fundamental indicators and concepts they handle, based on the study conducted by García, Araujo, Carvalho & Del Villar (2011). Bear in mind that both constitute ways of understanding and explaining the decision process to improve sports performance. Finally, the need to recognize the athlete's behavior as a complex system is exposed, where adaptation with time deficit is of vital importance. It is urged to overcome the vision of each approach in terms of finding convergent points, in an attempt to maximize the best of both perspectives.

Medical Diagnosis from a Clinician’s Point of View

1978 ◽  
Vol 17 (01) ◽  
pp. 28-35
Author(s):  
F. T. De Dombal
Keyword(s):  
Decision Making ◽  
Data Analysis ◽  
Computer Science ◽  
Medical Diagnosis ◽  
Information Science ◽  
Point Of View ◽  
Joint Research ◽  
The World

This paper discusses medical diagnosis from the clinicians point of view. The aim of the paper is to identify areas where computer science and information science may be of help to the practising clinician. Collection of data, analysis, and decision-making are discussed in turn. Finally, some specific recommendations are made for further joint research on the basis of experience around the world to date.

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