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Publisher: SciELO   (Total: 679 journals)

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Medicina Oral, patología oral y cirugía bucal     Open Access   (SJR: 0.432, h-index: 24)
Medicina y Seguridad del Trabajo     Open Access   (Followers: 1)
MEDISAN     Open Access  
MediSur     Open Access  
Memoria Americana     Open Access  
Memoria y Sociedad     Open Access  
Memórias do Instituto Oswaldo Cruz     Open Access   (SJR: 0.619, h-index: 51)
Meteorologica     Open Access  
Migración y Desarrollo     Open Access  
Migraciones Internacionales     Open Access   (SJR: 0.118, h-index: 2)
Motriz: Revista de Educação Física     Open Access   (SJR: 0.18, h-index: 2)
Multequina     Open Access  
Mundo Agrario     Open Access   (SJR: 0.1, h-index: 1)
Nefrología (Madrid)     Open Access   (SJR: 0.269, h-index: 18)
Neotropical Ichthyology     Open Access   (SJR: 0.612, h-index: 17)
Neurocirugia     Open Access   (SJR: 0.239, h-index: 13)
Nómadas     Open Access  
Norteamérica     Open Access   (Followers: 1)
Nova Economia     Open Access   (SJR: 0.166, h-index: 3)
Nova Tellus     Open Access   (Followers: 1)
Novos Estudos - CEBRAP     Open Access  
Nucleus     Open Access  
Nutrición Hospitalaria     Open Access   (SJR: 0.323, h-index: 23)
Obras y Proyectos     Open Access  
Odontoestomatología     Open Access   (Followers: 1)
Oncología (Barcelona)     Open Access  
Onderstepoort J. of Veterinary Research     Open Access   (Followers: 2, SJR: 0.177, h-index: 23)
Opinião Pública     Open Access   (SJR: 0.294, h-index: 5)
ORINOQUIA     Open Access  
Paidéia (Ribeirão Preto)     Open Access  
Palabra Clave     Open Access   (Followers: 1)
Pandaemonium Germanicum     Open Access  
Papéis Avulsos de Zoologia     Open Access   (Followers: 1, SJR: 0.911, h-index: 11)
Papeles de Población     Open Access   (SJR: 0.128, h-index: 2)
Parasitología al día     Open Access   (Followers: 1)
Parasitologia latinoamericana     Open Access   (Followers: 1)
Pastos y Forrajes     Open Access  
Pediatría Atención Primaria     Open Access   (SJR: 0.148, h-index: 4)
Pensamiento & Gestión     Open Access  
Per Musi     Open Access   (Followers: 1)
Perfil de Coyuntura Económica     Open Access  
Perfiles ducativos     Open Access   (SJR: 0.161, h-index: 2)
Perfiles Latinoamericanos     Open Access   (Followers: 1, SJR: 0.102, h-index: 1)
Perspectivas em Ciência da Informação     Open Access   (Followers: 9, SJR: 0.205, h-index: 3)
Pesquisa Agropecuária Brasileira     Open Access   (Followers: 1, SJR: 0.613, h-index: 29)
Pesquisa Odontológica Brasileira     Open Access   (SJR: 0.375, h-index: 18)
Pesquisa Operacional     Open Access   (SJR: 0.305, h-index: 6)
Pesquisa Veterinária Brasileira     Open Access   (SJR: 0.324, h-index: 18)
Pharmacy Practice (Internet)     Open Access   (Followers: 3, SJR: 0.197, h-index: 8)
Physis: Revista de Saúde Coletiva     Open Access   (Followers: 1, SJR: 0.448, h-index: 6)
Phyton (Buenos Aires)     Open Access   (SJR: 0.204, h-index: 8)
Planta Daninha     Open Access   (SJR: 0.413, h-index: 14)
Población y Sociedad     Open Access  
Polibotánica     Open Access  
Polímeros: Ciência e Tecnologia     Open Access   (Followers: 1, SJR: 0.228, h-index: 8)
Política Criminal     Open Access   (SJR: 0.102, h-index: 1)
Política y Cultura     Open Access  
Política y Gobierno     Open Access   (Followers: 1, SJR: 0.118, h-index: 5)
Potchefstroom Electronic Law J.     Open Access   (Followers: 3)
Prismas     Open Access  
Pró-Fono Revista de Atualização Científica     Open Access  
Pro-Posições     Open Access  
Produção     Open Access   (SJR: 0.19, h-index: 5)
Prohistoria     Open Access  
Proyecciones : Revista de matematica     Open Access   (Followers: 1)
Psic : Revista de Psicologia da Vetor Editora     Open Access  
Psico-USF     Open Access  
Psicologia & Sociedade     Open Access   (Followers: 1)
Psicologia : Ciência e Profissão     Open Access   (Followers: 1)
Psicologia Clínica     Open Access   (Followers: 1, SJR: 0.109, h-index: 2)
Psicología desde el Caribe     Open Access  
Psicologia em Estudo     Open Access   (SJR: 0.217, h-index: 7)
Psicologia Escolar e Educacional     Open Access  
Psicologia USP     Open Access   (SJR: 0.1, h-index: 3)
Psicologia: Reflexão e Crítica     Open Access   (SJR: 0.288, h-index: 8)
Psicologia: Teoria e Pesquisa     Open Access   (SJR: 0.33, h-index: 7)
Psychology & Neuroscience     Open Access   (Followers: 9, SJR: 0.164, h-index: 3)
Psychology in Society     Open Access   (Followers: 2)
Psykhe (Santiago)     Open Access   (SJR: 0.189, h-index: 4)
Química Nova     Open Access   (Followers: 1, SJR: 0.327, h-index: 36)
Quinto Sol     Open Access  
Radiologia Brasileira     Open Access   (Followers: 2, SJR: 0.205, h-index: 6)
RAE-eletrônica     Open Access  
RAM. Revista de Administração Mackenzie     Open Access  
RCOE     Open Access  
REAd : Revista eletrônica de administração     Open Access  
Región y Sociedad     Open Access   (Followers: 1)
Religião e Sociedade     Open Access   (Followers: 2)
Rem : Revista Escola de Minas     Open Access   (Followers: 1, SJR: 0.201, h-index: 6)
Revista Andaluza de Medicina del Deporte     Open Access   (SJR: 0.164, h-index: 3)
Revista Archivo Médico de Camagüey     Open Access  
Revista Argentina de Cardiología     Open Access  
Revista Argentina de Dermatología     Open Access   (SJR: 0.1, h-index: 2)
Revista Argentina de Microbiología     Open Access   (SJR: 0.245, h-index: 13)
Revista Argentina de Radiología     Open Access   (Followers: 2)
Revista Argentina de Sociología     Open Access   (Followers: 1)
Revista Árvore     Open Access   (Followers: 2, SJR: 0.488, h-index: 13)
Revista Brasileira de Biologia     Open Access  
Revista Brasileira de Ciência Avicola     Open Access   (Followers: 1, SJR: 0.254, h-index: 8)
Revista Brasileira de Ciência do Solo     Open Access   (Followers: 2, SJR: 0.777, h-index: 26)

  First | 1 2 3 4 5 6 7 | Last

Journal Cover Pesquisa Operacional
   Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 0101-7438
     Published by SciELO Homepage  [679 journals]   [SJR: 0.305]   [H-I: 6]
  • A hybrid method for a Project Scheduling Problem

    • Abstract: This work deals with a project scheduling problem where the tasks consume resources to be activated, but start to produce them after that. This problem is known as Dynamic Resource-Constrained Project Scheduling Problem (DRCPSP). Three methods were proposed to divide the problem into smaller parts and solve them separately. Each partial solution is obtained by CPLEX optimizer and is used to generate more complete partial solutions. The obtained results show that this hybrid method works very well.
       
  • Generalizating path and fan graphs: subcoloring and
           toughness

    • Abstract: Two graph classes are presented; the first one (k-ribbon) generalizes the path graph and the second one (k-fan) generalizes the fan graph. We prove that they are subclasses of chordal graphs and so they share the same structural properties of this class. The solution of two problems are presented: the determination of the subchromatic number and the determination of the toughness. It is shown that the elements of the new classes establish bounds for the toughness of k-path graphs.
       
  • A note on the NP-hardness of the separation problem on some valid
           inequalities for the elementary shortest path problem

    • Abstract: In this paper, we investigate the separation problem on some valid inequalities for the s - t elementary shortest path problem in digraphs containing negative directed cycles. As we will see, these inequalities depend to a given parameter k ∈ ℕ. To show the NP-hardness of the separation problem of these valid inequalities, considering the parameter k ∈ ℕ, we establish a polynomial reduction from the problem of the existence of k + 2 vertex-disjoint paths between k + 2 pairs of vertices (s1, t1), (s2, t2) ... (sk+2, t k+2) in a digraph to the decision problem associated to the separation of these valid inequalities. Through some illustrative instances, we exhibit the evoked polynomial reduction in the cases k = 0 and k = 1.
       
  • An efficient hybrid heuristic method for the 0-1 exact k-item
           quadratic knapsack problem

    • Abstract: The 0-1 exact k-item quadratic knapsack problem (E - kQKP) consists of maximizing a quadratic function subject to two linear constraints: the first one is the classical linear capacity constraint; the second one is an equality cardinality constraint on the number of items in the knapsack. Most instances of this NP-hard problem with more than forty variables cannot be solved within one hour by a commercial software such as CPLEX 12.1. We propose therefore a fast and efficient heuristic method which produces both good lower and upper bounds on the value of the problem in reasonable time. Specifically, it integrates a primal heuristic and a semidefinite programming reduction phase within a surrogate dual heuristic. A large computational experiments over randomly generated instances with up to 200 variables validates the relevance of the bounds produced by our hybrid dual heuristic, which yields known optima (and prove optimality) in 90% (resp. 76%) within 100 seconds on the average.
       
  • A method for solving linear programming models with Interval Type-2
           fuzzy constraints

    • Abstract: This paper shows a method for solving linear programming problems that includes Interval Type-2 fuzzy constraints. The proposed method finds an optimal solution in these conditions using convex optimization techniques. Some feasibility conditions are presented, and some interpretation issues are discussed. An introductory example is solved using the proposed method, and its results are described and discussed.
       
  • Group decision making applied to preventive maintenance systems

    • Abstract: This paper describes an application in group decision making, aimed at developing a procedure to help define priorities in preventive maintenance activities. The method applied is called DRV Processes (Decision with Reduction of Variability) and it combines both statistical techniques and multicriteria decision aid procedures. Among its advantages, we may highlight the possibility of reducing the noise affecting information in group decision making and of reaching a consensual decision. This approach generally improves the level of shared knowledge and helps to avoid conflict within the group. The application was carried out in a major pharmaceutical production plant. The experience showed an eighty per cent reduction in the original amount of process noise. Moreover, the paper describes evidence of improvement in interpersonal relationships.
       
  • XVI Latin-Ibero-American Conference on Operations Research/XLIV
           Brazilian Symposium on Operations Research (CLAIO/SBPO - 2012)

    •  
  • Optimal design of an IP/MPLS over DWDM network

    • Abstract: Different approaches for deploying resilient optical networks of low cost constitute a traditional group of NP-Hard problems that have been widely studied. Most of them are based on the construction of low cost networks that fulfill connectivity constraints. However, recent trends to virtualize optical networks over the legacy fiber infrastructure, modified the nature of network design problems and turned inappropriate many of these models and algorithms. In this paper we study a design problem arising from the deployment of an IP/MPLS network over an existing DWDM infrastructure. Besides cost and resiliency, this problem integrates traffic and capacity constraints. We present: an integer programming formulation for the problem, theoretical results, and describe how several metaheuristics were applied in order to find good quality solutions, for a real application case of a telecommunications company.
       
  • Two-dimensional packing problems in telecommunications

    • Abstract: We present the transcript of the IFORS distinguished lecture delivered by the author on invitation of SOBRAPO and IFORS. The lecture concerned the development of an interdisciplinary research motivated by an application in mobile telecommunication systems, a project jointly developed by four research teams. The presentation follows the typical steps of a classical operations research study, and aims at reviewing the main theoretical and practical results that were obtained.
       
  • Input allocation with the Ellipsoidal Frontier Model

    • Abstract: This work aims at complementing the development of the EFM (Ellipsoidal Frontier Model) proposed by Milioni et al. (2011a). EFM is a parametric input allocation model of constant sum that uses DEA (Data Envelopment Analysis) concepts and ensures a solution such that all DMUs (Decision Making Units) are strongly CCR (Constant Returns to Scale) efficient. The degrees of freedom obtained with the possibility of assigning different values to the ellipsoidal eccentricities bring flexibility to the model and raises the interest in evaluating the best distribution among the many that can be generated. We propose two analyses named as local and global. In the first one, we aim at finding a solution that assigns the smallest possible input value to a specified DMU. In the second, we look for a solution that assures the lowest data variability.
       
 
 
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