Valdecy Pereira

Nonlinear programming applied to the reduction of inconsistency in the AHP method

Analytic Hierarchy Process is one of the most known multicriteria decision aid methods. Nevertheless, as it relies on decision makers (DM) pairwise comparisons, a problem may occur if some comparisons are not well done. This issue, known as inconsistency, appears when an inconsistency threshold is violated. One way to deal with inconsistency is to redo all judgments, as many times as needed, in order to reach acceptable levels. This work proposes a nonlinear programming model that reduces inconsistency to zero or near zero, without needing to redo all judgments. The reduction is achieved by adjusting the original judgments in a minimum way, keeping the DM’s decisions within a tolerable range. Only discrete values are generated, so the solution respects the limits of the Saaty scale (1–9). To illustrate the efficiency of the nonlinear model, a comparison between the proposed model and other models taken from recent literature was made. The results show that the proposed model performed better, since the original judgments were changed in a minimum way, also the inconsistency was completely removed. Alternatively, if some inconsistency is allowed more original judgments can be preserved.

A literature review on lot size with quantity discounts: 1995-2013

Purpose – This paper aims to present a literature review on models developed for the economic order quantity (EOQ) problem with incremental and all-units discounts, extending the work of Benton and Park (1996) which covered the most significant literature, from 1963 to 1994, about EOQ with discounts and that has identified four open areas in this field of study. The modeling of lot size with discounts wishes to give good solutions for realistic situations, such as those concerning the discounts offered by suppliers, to rises in the demand. Design/methodology/approach – The research was carried out in papers published from 1995 to 2013, and indexed in databases as Scopus and ISI Web of Science. The papers were compared through objective function, constraints, discounts, developed algorithms, allowance of shortages or multiproduct, demand pattern and buyer or buyer–supplier perspective. Findings – Results indicate two areas that still remain untouched, and probably the main cause is due to mathematical comp...

Auxílio multicritério à decisão aplicado ao planejamento e gestão na indústria de petróleo e gás

The application of multicriteria methods in the planning and management of the oil and gas industry has been studied by various authors. However, these studies are distributed in a scattered manner in the literature, which creates difficulties in obtaining an overview. To provide a systematic view on this matter, this paper presents a bibliographical mapping of papers that approach the use of multicriteria methods for planning and management in the oil and gas industry. The reviewed documents were selected through a search in the Scopus and ISI (Web of Knowledge) databases. Among the study results, it is found that the most commonly used multicriteria method was AHP (Analytic Hierarchy Process). Furthermore, it is observed that the majority of multicriteria method applications are related to oil, midstream activities and onshore facilities.

A PROBABILISTIC APPROACH APPLIED TO THE CLASSIFICATION OF COURSES BY MULTIPLE EVALUATORS

How to measure the perceived influence of a course on its alumni skills? This paper describes the use of CPP-TRI as a tool to face this problem. The method was applied here in the context of a M.Sc. course evaluation. Levels of impact and importance previously determined for different features provide the framework for the analysis. Classifications by different groups of evaluators are combined. Taking into account the subjectivity in the assessments, CPP-TRI treats them as realizations of random variables. The combination of the evaluations is performed by computing joint probabilities, what avoids the assignment of weights to evaluators. Interval classifications between a hostile and a benevolent limit are provided offerings the educational evaluator a deeper understanding of the results. An additional study is here performed on the classification of the features. A total of sixteen features are sorted.

Linear Integer Model for the Course Timetabling Problem of a Faculty in Rio de Janeiro

This work presents a linear integer programming model that solves a timetabling problem of a faculty in Rio de Janeiro, Brazil. The model was designed to generate solutions that meet the preferences of the faculty’s managers, namely, allocating the maximum number of lecturers with highest academic title and minimising costs by merging courses with equivalent syllabuses. The integer linear model also finds solutions that meet lecturers’ scheduling preferences, thereby generating more practical and comfortable schedules for these professionals. Preferences were represented in the objective function, each with a specific weight. The model outperformed manual solutions in terms of response time and quality. The model was also able to demonstrate that lecturers’ scheduling preferences are actually conflicting goals. The model was approved by the faculty’s managers and has been used since the second semester of 2011.

Criteria selection for evaluation of ERP systems implementation in large Brazilian companies

Purpose – This paper aims to identify criteria that can be used in assessing the successful implementation of ERP (enterprise resource planning) in large companies. Design/methodology/approach – Based on a systematic review conducted in 74 selected articles from a survey performed in Scopus bases and Institute for Scientific Information (ISI) Web of Science, an initial set of 34 criteria was defined and used for evaluating the implementation of ERP systems. This set was submitted to a sample of 111 experts in ERP for evaluation via electronic forms provided through the EncuestaFacil site. The collected data were treated by applying the Content Validity Ratio (CVR) method. The criteria selection is based on the integration of two methodological approaches: systematic review and the application of CVR method for validation of ratings issued by experts. Findings – As a result of the research, 25 criteria were identified and validated to evaluate the implementation of ERP systems, focusing on large Brazilian ...

MAPPING THE USE OF MULTICRITERIA METHODS APPLIED TO PUBLIC SECURITY

Public security is a topic with increasing relevance over the years. In this context, the growing demand requires decisions that consider multiple points of view, some of them subjective. This work is based on the assumption that few studies have been conducted in the public security sector employing multiple criteria techniques to support the decision making procedure. In this context, this research had the objective of mapping the application of MCDA methods within the scope of public security. A literature review in the journals of the Scopus and ISI Web of Science databases was carried out in October 2016, accessed through Capes portal, integrating the following themes: public security and multicriteria decision aid. A systematic search was conducted by applying the Webibliomining method. After applying specific keywords and filters 965 records were returned from Scopus and 788 records from the ISI Web of Science. The review of findings summary resulted in a set of 19 articles validated as compliant for inclusion in the revision, where 19 were from Scopus and 6 were shared with the Web of Science base. The analysis of the articles showed that there is no predominant multicriteria method in the context of the search. The recurrent applications refer to the resolution of the policing distribution problem, and classification of crime rate by region. The key contribution of this work is to provide the reader with a map of public safety problems already addressed in the context of MCDAs approaches and to highlight aspects of this problem that have not yet explored in the context of the MCDA.

MÉTODO ELECTRE III APLICADO NA MODELAGEM DO PROCESSO DE ACESSO A ALTA GESTÃO EM ÓRGÃO DE SEGURANÇA PÚBLICA

O presente estudo objetivou reduzir o efeito compensatório dos critérios de escolha nos processo de promoção funcional de acesso aos cargos de alta gestão em órgão de segurança pública no Estado do Rio de Janeiro, por meio da aplicação de método multicritério de apoio à decisão MCDA. Em relação aos fins pode-se classificar a pesquisa como metodológica e aplicada. Quanto aos meios como bibliográfica, documental, e de laboratório. A pesquisa bibliográfica identificou que há poucos estudos de MCDA aplicados ao campo de segurança pública. A pesquisa documental proporcionou a descrição do sistema vigente no órgão pesquisado. Em laboratório foi utilizado o software J-Electre, que a partir dos dados coletados gerou as matrizes de concordância, discordância, de credibilidade e rank final, do método ELECTRE III, dos 124 candidatos que integravam o quadro de acesso por merecimento a promoção ao posto de coronel da Polícia Militar, em dezembro de 2016. Os resultados, revelam que o processo de classificação resultante da modelagem do problema com o Método ELECTRE III, apresenta eliminação do efeito compensatório, o que resultou em uma alteração de posição em 93,55 % em relação ao modelo atual em utilização na Polícia Militar do Estado do Rio de XXXVII ENCONTRO NACIONAL DE ENGENHARIA DE PRODUCAO “A Engenharia de Produção e as novas tecnologias produtivas: indústria 4.0, manufatura aditiva e outras abordagens avançadas de produção”

A multiproduct economic order quantity model with simulated annealing application

Purpose This paper aims to present a set of five models for the economic order quantity problem. Four models solve problems for a single product: incremental discounts with or without backorders and all-unit discounts with or without backorders, and the last model solves problems for the multiproduct case. Design/methodology/approach A basic integer non-linear model with binary variables is presented, and its flexible structure allows for all five models to be utilised with minor modifications for adaptation to individual situations. The multiproduct model takes into consideration the work of Chopra and Meindl (2012), who studied two types of product aggregations: full and adaptive. To find optimal or near-optimal solutions for the multiproduct case, the authors propose a simulated annealing metaheuristic application. Numerical examples are presented to improve the comprehension of each model, and the authors also present the efficiency of the simulated annealing algorithm through an example that aggregates 50 products, each one with different discount schemes and some allowing backorders. Findings Our model proved to be efficient at finding optimal or near optimal solutions even when confronted with mathematical complexities such as the allowance of backorders and incremental discounts. Originality/value Finally our model can process a mix of products with different discount schemes at the same time, and the simulated annealing metaheuristics could find optimal or near optimal solutions with very few iterations.

Mapping perceptions about the influence of critical success factors in BPM initiatives

This article reports a research that has colletected and analyzed perceptions about the influence of CSF in Business Processes (BPM) initiatives. A systematic literature review was performed in papers published in indexed journals. In a second step, a survey was applied to a short sample composed by experts in BPM, with a single question: what area the CSF that most influence in the implementation of process management? After it, a full questionnaire was build and applied to an extended sample composed by Brazilian BPM experts. As a result, the top 10 CSF perceived as most critical to the success in BPM initiatives were identified. The main contributions of this paper are the original way the CSF were elicited and how their importance was found out, both in a systematized and robust way that can be followed by other researches and practioneers. Keywords— Business Process Management, BPM, Critical Factors, CFS, survey