1,721,170 research outputs found
Şantierul arheologic Dolheştii Mari (r. Fălticeni, reg. Suceava) / Le chantier archéologique de Dolheştii Mari
No full textDinu Marin. Şantierul arheologic Dolheştii Mari (r. Fălticeni, reg. Suceava) / Le chantier archéologique de Dolheştii Mari. In: Materiale şi cercetări arheologice, N°7 1961. pp. 121-129
Sondajul arheologic de la Dolheştii Mari (r. Fălticeni, reg. Suceava) / Le sondage archéologique de Dolheştii Mari
No full textDinu Marin. Sondajul arheologic de la Dolheştii Mari (r. Fălticeni, reg. Suceava) / Le sondage archéologique de Dolheştii Mari. In: Materiale şi cercetări arheologice, N°6 1959. pp. 213-220
A manufacturing cell formation problem with a maximum cell workload constraint
No full textWe address a manufacturing cell formation problem (CFP) in which one of the constraints limits the maximum cell workload to a given threshold. To meet such a requirement, it is possible to allocate copies of existing machines in different cells. Additional machines, however, increase costs and may also increase inter-cell flow. The proposed CFP is first modelled in terms of bilevel optimization and then reformulated as a single-level optimization problem. To the best of our knowledge, this is the first study addressing the CFP with a cell workload constraint as a bilevel optimization problem. The results of this paper have direct implications for real-world decision-making for at least two reasons. One is related to the methodology used that allows one to model the actual dynamic of the decision-making process more accurately. The second reason is that the proposed model enables better system efficiency when both machine and inter-cell material handling costs are minimized. Experimental results are presented and discussed
Lower Bound Improvements of Penalty Parameters for Discrete-Continuous Linear Bilevel Problems
No full textEnhanced exact algorithms for discrete bilevel linear problems
No full textWe address a particular class of bilevel linear programming problems in which all the variables are discrete. The main computational complexities are analyzed and two enhanced exact algorithms are proposed. The rationale behind these two algorithms is described and a modified version is presented for both. A common test bed is used to assess their computational efficiency along with a comparison with an existing benchmark algorithm
On the Choice of the Penalty Parameter for Discrete-Continuous Linear Bilevel Problems Reformulation
No full textIn this paper we focus on linear bi-level problems in which the variables controlled by the leader are discrete. It is known that such problems are equivalent to continuous linear bi-level problems in which the integrality requirements are relaxed and the leader's objective function is modified including a concave penalty function weighted by a parameter µ. The equivalence holds for a sufficiently large value of µ. A valid lower bound for µ is known in the literature. In the following, we provide an improvement of this lower bound and experiment the new lower bound on a set of test problems
A decomposition approach to solve a bilevel capacitated facility location problem with equity constraints
No full textIn this paper, we study a capacitated facility location problem 1 with two decision makers. One (say, the leader) decides on which subset of facilities to open and the capacity to be installed in each facility with the goal of minimizing the overall costs; the second decision maker (say, the follower), once the facilities have been designed, aims at maximizing the profit deriving from satisfying the demands of a given set of clients beyond a certain threshold imposed by the leader. The leader can foresee but cannot control the follower’s behavior. The resulting mathematical formulation is a discrete–continuous bilevel optimization problem. We propose a decomposition approach to cope with the bilevel structure of the problem and the integrality of a subset of variables under the control of the leader. Such a proposal has been tested on a set of benchmark instances available in the literature
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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