1,721,030 research outputs found
Tra terra e mare. Un sistema rupestre “diffuso” nell’agro di Vernole (Lecce, Puglia meridionale)
No full textCaratterizzato da una morfologia piatta ed omogenea interrotta solo da rialzi rocciosi isolati che raggiungono appena i 44 m. s.l.m., il territorio compreso tra la città di Lecce e la vicina costa adriatica conserva ancora alcune evidenze ipogee a testimonianza della straordinaria capacità produttiva di un’area rurale che è stata, per molti aspetti, di difficile gestione. Bassi affioramenti rocciosi discontinui ed estesi, ampie aree paludose e un sistema di collegamento incerto non hanno, nei secoli impedito alle comunità locali l’utilizzo delle risorse disponibili e la continuità insediativa nei borghi rurali, negli insediamenti isolati e in piccoli contesti rupestri. Il lavoro offre un contributo allo studio del fenomeno rupestre nel Tavoliere di Lecce, area che non presenta caratteristiche morfologiche particolarmente favorevoli allo sviluppo di articolati sistemi in rupe, ma che conserva ancora un patrimonio rupestre diffuso e spesso nascosto
Overall Measurement Of Process Equipment Effectiveness For Performance Monitoring and Decisions Assess
No full textOverall Equipment Effectiveness provides a consistent method to measure productivity and to perform diagnosis at the equipment level. OEE metric is based on the idea of comparing Valuable Production Time with Up Time. It distils complex data, including downtime and waste in individual machines/equipments and other unplanned losses which reduce throughput, in a simple understandable metric. However, according to experience and literature review, its excessive synoptic view manifests lack at the factory level and timing of monitoring and planning in plants. This research is going to explore the use of OEE, not only as an operational measure of equipment effectiveness, but also as an indicator of which activities have to get better in process decision making issues. Hidden capacity identification, bottleneck detection, buffer consistency and location, planned improvements within a manufacturing environment can be diagnosed according with a measure of Overall Process Equipment Effectiveness (i.e., OPEE). As reminder of this paper the theoretical concept of OEE metric is considered first and constituent parts of OEE are examined. An exhaustive literature review and a critical analysis of OEE measurement, in production systems, are drawn up. Afterwards, the new OPEE approach is proposed. The coming up of such a metric was logical achieved and finally demonstrated implementing a virtual set of predefined subsystems including series, parallel, assembly and expansions. The new metric achieves and manifests a performance monitoring perspective in identifying bottlenecks as well as putting forward to deciding. Such a vision is suggested as a standard in simulation frame
An Automated Procedure for Machines Distribution among Plants based on Genetic Algorithm Approach
No full textThe present research is focused on the development of a facility layout problem (FLP) using genetic approach for robust optimization (i.e., GA) and analysis of Variance ANOVA used to identify critical parameters of the genetic algorithm. The main advantage of such type of algorithms with respect to the other artificial intelligent approaches is represented by the possibility to simulate the natural evolution of a survival fitness function and, in the specific case, the minimization of material handling costs for different located machines. Hard constraints (e.g., machine overall dimensions and production cycle) have been taken into consideration. The implemented algorithm uses a string encoding, a partially matched crossover (i.e., PMC) to generate the offspring and a repair method to modify infeasible solutions. The repair method analyzes the solution, identifies the plants in which the constraints are not observed and places a random machine into another plant. The input data are production cycles, areas of a plant, machines and storehouse. To investigate the effects of individual parameters of GAs, a design of experiments (DOE) was employed. Early analysis of factors (i.e. dimension of population, fraction of elitism and fraction of eliminated genes during generations) was conducted with a full factorial plan with two levels for each factor and four repetitions. A trade-off of the population dimension and maximum number of generations allows to achieve good results in short computation time. The results are presented in terms of reduction of external transport costs
An automated procedure for machines distribution among plants based on genetic algorithm approach
No full text
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
Innovating Cultural Heritage promotion through virtual and interactive technologies
No full textThe Italian cultural heritage is well known due to its extraordinary richness, but its potential attractiveness is still not exploited. The cultural institutions today are facing several challenges to attract visitors, but it is not enough; it is necessary to find an innovative way to communicate culture, in order to bring it closer to the need for cultural knowledge and experience of citizens and tourists. This paper aims at introducing an innovative technological framework, which will enable the sharing of a digitalized cultural heritage experience. Furthermore, the potential benefits and implication related to the framework development will be described. The framework founds on a basis of cultural heritage contents research and systematization, subsequently, on the virtual reconstruction and digitalization of historical elements and finally the creation of an interactive experience for the user
Collecting, transporting and storing water in karst settings of southern Italy: Some lessons learned from ancient hydraulic systems
No full textThe karst landscapes of southern Italy, even though they show a lack or scarce presence of water at the surface, host a variety of ancient hydraulic works realized to collect and store water resources, to the advantage of the local settlements and for agricultural purposes as well. Ancient populations were forced to gain a deep knowledge of the territory in order to exploit the few available water resources, and developed for this aim several techniques, reaching a high level of capability to collect, transport, and distribute water, even at long distances. Many areas in southern Italy still nowadays present hydraulic works of remarkable interest and historical value, which are briefly described in the present paper, together with other features used for water storage in karst. Studying these ancient works, and safeguarding them, should be a priority aimed at educating the young generations toward a sustainable use of the water resource. © IWA Publishing 2013
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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