1,720,995 research outputs found
Availability in Human order picking systems: an empirical study on worker’s performance profile
No full textThe precise estimation of the performance of an order picking system can hugely resent from its availability; availability resents from the presence of behavioral aspects that are difficult to predict, such as the variability of human efficiency due to the influence of individual productivity profiles. These subjective factors are closely related to worker behavior, and, for this reason, they are difficult to express with mathematical functions that can generalize their overall effect on performance deviance in manufacturing systems. Based on a manual order picking system case study, this research proposes an empirical analysis of the work performance during a single work shift. This work considers the discretionary management of picker microbreaks as a source of deviation from work schedules for clustering different performance profiles based on picker productivity data. A deductive approach based on availability analysis was carried out to outline individual productivity profiles capable of incorporating all performance-relevant input factors to determine the attitude of different groups of workers to behave and work similarly
A new methodological framework to schedule job assignments by considering human factors and workers' individual needs
Full text linkOne of the biggest management challenges for companies consists in including workers’ features during production process decisions to obtain more realistic planning and scheduling outcomes. The increasing percentage of ageing operators in manufacturing areas, due to the postponement of retirement age, contributes to enhance the level of both physical and cognitive disparity among workers. Moreover, workers could present physical limitations that restrict the execution of certain tasks. Strong seasonality and the current spread of e-commerce lead companies to face sudden high peaks of market demand through constant operators’ turnover. Consequently, workers are not equally skilled and work-related injuries can arise whether tasks are not performed correctly by an ergonomic viewpoint. In such a context, Industry 4.0 tools and real-time monitoring systems have gained higher attention since they can be adopted for training purpose and also such as data collector for every single worker in order to propose ad hoc job rotation solutions. In this paper, we propose a new methodological framework that integrates anthropometric and ergonomics measures during the scheduling decision process and defines all steps needed to define a worker-oriented and flexible scheduling of assembly tasks or job assignment. Each task is categorized in the framework according to three drivers: physical stress, ergonomic risk and execution time. According to the variability of each of them among workers, we propose a step-by-step procedure that can help practitioners to select the most suitable worker in executing each task aiming to reach flexible scheduling by an inclusive workforce
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Vasilij Grossman: il comunismo come antitesi della libertà
No full textIl saggio ricostruisce la critica operata dallo scrittore ebreo-russo Vasilij Grossman allo Stato sovietico e all'ideologia totalitaria marxista-leninista, evidenziando in particolare il carattere antimoderno e antioccidentale che l'autore attribuisce alla rivoluzione bolscevic
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