Islamic Azad University, Qaemshahr BranchFuzzy Optimization and Modeling Journal2676-70071120200401Fuzzy bi-level linear programming problem using TOPSIS approach110543187ENShyamaliGhoshDept. of Applied Mathematics with Ocenology and Computer Programming,
Vidyasaghar University, IndiaSankar KumarRoyDepartment of Applied Mathematics with Oceanology and Computer ProgrammingJournal Article20200401This paper deals with a class of bi-level linear programming problem (BLPP) with fuzzy data. Fuzzy data are mainly considered to design the real-life BLPP. So we assume that the coefficients and the variables of BLPP are trapezoidal fuzzy numbers and the corresponding BLPP is treated as fuzzy BLPP (FBLPP). Traditional approaches such as vertex enumeration algorithm, Kth-best algorithm, Krush-Kuhn-Tucker (KKT) condition and Penalty function approach for solving BLPP are not only technically inefficient but also lead to a contradiction when the follower’s decision power dominates to the leader’s decision power. Also these methods are needed to solve only crisp BLPP. To overcome the difficulty, we extend Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) in fuzzy environment with the help of ranking function. Fuzzy TOPSIS provides the most appropriate alternative solution based on fuzzy positive ideal solution (FPIS) and fuzzy negative ideal solution (FNIS). An example is included how to apply the discussed concepts of the paper for solving the FBLPP.http://fomj.qaemiau.ac.ir/article_543187_2892f6cd21a34b6729f1615620408a2f.pdfIslamic Azad University, Qaemshahr BranchFuzzy Optimization and Modeling Journal2676-70071120200401A Hybrid Algorithm for Fault Diagnosis using Fuzzy Clustering Tools1131545576ENAdriánRodríguez RamosDepartamento de Automática y Computación, Universidad Tecnológica de la Habana José Antonio Echeverría, CUJAE, La Habana, CubaPedro JuanRivera-TorresDepartamento de Ciencias de Computos, Universidad de Puerto Rico, Recinto de Río Piedras, San Juan, Puerto RicoAntônio JoséDa Silva NetoInstituto Politécnico da Universidade do Estado do Rio de Janeiro (IPRJ/UERJ), Nova Friburgo, RJ, BrazilOrestesLlanes-SantiagoPolitécnico da Universidade do Estado do Rio de Janeiro (IPRJ/UERJ), Nova Friburgo, RJ, Brazil0000-0002-6864-9629Journal Article20200501In this paper, a hybrid algorithm using fuzzy clustering techniques is proposed for developing a robust fault diagnosis platform in industrial systems. The proposed algorithm is applied in a fault diagnosis scheme with online detection of novel faults and automatic learning. The hybrid algorithm identifies the outliers based on data density. Later, the outliers are removed, and the clustering process is performed. To extract the important features and improve the clustering, the maximum-entropy-regularized weighted fuzzy c-means is used. The use of a kernel function allows achieving a greater separability among the classes by reducing the classification errors. Finally, a step is used to optimize the parameters m (regulation factor of the fuzziness of the resulting partition) and (bandwidth, and indicator of the degree of smoothness of the Gaussian kernel function). The proposed hybrid algorithm was validated using the Tennessee Eastman (TE) process benchmark. The results obtained indicate the feasibility of the proposal.http://fomj.qaemiau.ac.ir/article_545576_75762c0b0adf02f16d2b3cc878a83739.pdfIslamic Azad University, Qaemshahr BranchFuzzy Optimization and Modeling Journal2676-70071120200401The Reference Ideal Method and the Pythagorean Fuzzy Numbers3241545712ENElioCablesDepto de Ingeniería Informática, Universidad de Holguín "Oscar Lucero Moya", Holguín, CubaMaría TeresaLamataUniversity of GranadaJose LuisVerdegayComputer Science and Artificial Intelligence, University of Granada, SpainJournal Article20200505As it is well known, in spite of having small dimensions, there are daily many<br />situations that require the solution of a decision-making problem: eating, streets<br />crossing, assessments, shopping and so on. Generally, the way of working on<br />these types of problems depends on how the information used to evaluate each<br />alternative is provided and represented, as for instance is the case with: crisp <br />values, fuzzy values, Pythagorean values, etc. In this way, different very wellknown<br />methods have been developed and modified to help to solve this kind of<br />problems. Among them, the following may be remarked: AHP, PROMETHEE,<br />ELECTRE, VIKOR, TOPSIS. But there are many other. This paper shows how<br />to apply the so-called Reference Ideal Method (RIM), previously developed by<br />the authors, when Pythagorean Fuzzy numbers are used to evaluate each<br />alternative. The paper shows how to solve a decision-making problem through<br />the proposed method using such kind of fuzzy numbers and, in order to show<br />how to practically apply the RIM method, an illustrative example is provided.http://fomj.qaemiau.ac.ir/article_545712_cd2fb93e884b23554f7c3b9c55e06386.pdfIslamic Azad University, Qaemshahr BranchFuzzy Optimization and Modeling Journal2676-70071120200401Optimum Selection of Drill Bits for Drilling Operations in Sarvak and Asmari Formations Using a Fuzzy Multiple Criteria Decision-Making Approach4251669003ENArashEbrahimabadiDepartment of Mining, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran0000-0002-1996-2731SiavashMoradiDepartment of Petroleum Engineering, Science and Research Branch, Islamic Azad University, Tehran, IranJournal Article20200510Proper decision making in drilling bit selection issue may contribute to drilling efficiency and considerable cost reduction. Since the bit selection is a Multiple Criteria Decision-Making (MCDM) problem, MCDM techniques are the most powerful approaches to be applied in such cases. In this study, among MCDM approaches and with respect to great accuracy and validity of results, fuzzy TOPSIS method is utilized for optimum bit selection for drilling operations in Sarvak and Asmari formations in an Iranian oil field. With this regard, three types of bits (i.e. 517, 527 and 537) candidate in Asmari & Sarvak formations are analysed using fuzzy TOPSIS method to rank and prioritize the alternatives, leading to choose the best option. Considering bits operating in Asmari formation, similarity factors for bit types of 517, 527 and 537 bits found to be 0.479, 0.438 and 0.382, respectively indicating bit type 517 can be considered a proper option compared to other ones. Similarly, achieved results from application of fuzzy TOPSIS approach in Sarvak formation shows 0.5405, 0.5019 and 0.5622 values for 517, 527 and 537 bit types respectively, demonstrating the bit type 537 is the most appropriate alternative in Sarvak formation.http://fomj.qaemiau.ac.ir/article_669003_b6980649de1c1cd8f1d573181bc4d4c8.pdfIslamic Azad University, Qaemshahr BranchFuzzy Optimization and Modeling Journal2676-70071120200401Ranking method for efficient units by RPA and TOPSIS in DEA5260669004ENFarzadRezai BalfDepartment of Mathematics, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran.Journal Article20200712This paper considers the rank of set efficient units in Data envelopment analysis (DEA). DEA measures the efficiency of decision making units (DMUs) within the range of less than or equal to one. The corresponding efficiencies are referred to as relative efficiencies, which describe the best performances of DMUs, and these efficient units determine efficiency frontier. This research proposes an extended on a current research by a technique for order preference by similarity to an ideal solution (TOPSIS) method. Therefore, in this paper, we first introduce two methods namely regular polygon area (RPA) and TOPSIS. Then using common set of weights in order to all efficient units obtained from DEA models, they are projected into two-dimensional plane. Finally, the units are ranked by RPA and TOPSIS methods. Also, with the numerical example, our method is compared with other methods. The obtained results of numerical example show that they are almost close to each of several methods. http://fomj.qaemiau.ac.ir/article_669004_26e11007a17717fc6e8b0c803dc5615e.pdf