1,721,355 research outputs found
Alfieri a Ginevra
No full textUna nuova interpretazione dell'intervento di Benedetto Alfieri a Ginevra, considerato nel contesto europeo. A new interpretation of Alfieri's intervention in St. Pierre, Genève (1750
Alfieriani e antialfieriani: due partiti a Siena nel 1784
No full textSull'attività di Alfieri a Sien
Single machine scheduling problems with generalized preemption
No full textWe address a class of single-machine, hard scheduling problems with the objective of minimizing the maximum tardiness. The jobs can be preempted, but whenever a job is started or resumed, there is a recovery interval affecting its progress. Such a feature is motivated by certain application environments and generalizes the usual preemption concept. For three different cases of this problem, we propose a heuristic algorithm, based on the partial enumeration of feasible schedules. A packing formulation solved by means of a column generation approach is used to certify the quality of the heuristic solution. An extensive computational experience shows the effectiveness of the approach on different classes of instances and shows that real-size problems can be solved to optimality in an acceptable amount of time. © 2009 INFORMS
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
Technical, economic, and environmental performance assessment of manufacturing systems: the multi-layer enterprise input-output formalization method
Full text linkIn the production planning and control field, assessing the performance of a manufacturing system is a multi-dimensional problem in which neglected dimensions may lead to hidden inefficiencies and missed opportunities for gaining a competitive advantage. In this paper, a new data formalization method is proposed to model a manufacturing system by simultaneously considering value creation and technical, economic, and environmental performance. The proposed method combines the principles of Material Flow Analysis and a new data structure that exploits some characteristics of the Multi-layer Stream Mapping and the Enterprise Input-Output methods to obtain a data-driven approach, typical of Industry 4.0. The proposed method can deal with complex systems and allows to consider also non-value-added activities such as transport and inventories. The implementation of the method and its advantages are shown through a numerical example based on a recycled plastic pipeline manufacturing system. The method shows positive synergies and mutual benefits between sustainable production, lean principles, and data-driven approaches and technologies of Industry 4.0. The method improves the alignment of environmental, technical, economic, and value creation information between operational and strategical levels, removing redundancies in data collection, conditioning, and processing activities, thus reducing partial information, hidden risks and opportunities, and inconsistencies
Exact algorithms for a discrete metric labeling problem
No full textWe are given a edge-weighted undirected graph G = (V, E) and a set of labels/colors C = {1, 2, . . . , p}. A non-empty subset
C_v in C is associated with each vertex v in V. A coloring of the vertices is feasible if each vertex v is colored with a color of C_v. A
coloring uniquely defines a subset E_0 in E of edges having different colored endpoints. The problem of finding a feasible coloring
which defines a minimum weight E_0 is, in general, NP-hard. In this work we first propose polynomial time algorithms for some
special cases, namely when the input graph is a tree, a cactus or with bounded tree-width. Then, an implicit enumeration scheme
for finding an optimal coloring in the general case is described and computational results are presented
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