1,721,047 research outputs found
Exploiting Replication to Improve Performances of NUCA-Based CMP Systems
Full text linkImprovements in semiconductor nanotechnology made chip multiprocessors the reference architecture for high-performance microprocessors. CMPs usually adopt large Last-Level Caches (LLC) shared among cores and private L1 caches, whose performances depend on the wire-delay dominated response time of LLC. NUCA (NonUniform Cache Architecture) caches represent a viable solution for tolerating wire-delay effects. In this article, we present Re-NUCA, a NUCA cache that exploits replication of blocks inside the LLC to avoid performance limitations of D-NUCA caches due to conflicting access to shared data. Results show that a Re-NUCA LLC permits to improve performances of more than 5% on average, and up to 15% for applications that strongly suffer from conflicting access to shared data, while reducing network traffic and power consumption with respect to D-NUCA caches. Besides, it outperforms different S-NUCA schemes optimized with victim replication
Il ruolo degli immigrati italiani nell’espansione della frontiera agraria in Argentina
No full textTra fine Settecento e inizio Ottocento inizia una progressiva espansione della frontiera agricola nei maggiori paesi americani, tra cui l'Argentina. Un fenomeno che rispondeva a esigenze economiche, ma anche politico sociali e che con l'avvio della grande emigrazione nella seconda metà del secolo XIX avrà tra i suoi maggiori protagonisti gli italiani. Di fatto, essi ebbero un ruolo essenziale sia nella fase pionieristica, quella delle colonie intorno alla metà del Secolo; sia in quella della maggior espansione dei terreni messi a coltivazione nell'ultimo terzo dell'Ottocento, quando formarono la netta maggioranza della mano d'opera nella grandi aziende agricole argentine, contribuendo alla creazione di quella che venne definita "pampa gringa", ovvero italiana, e al boom economico rioplatense legato soprattutto all'esportazione dei cereali. Tuttavia le crisi di fine secolo e gli inizi del Novecento comportarono per gli immigrati un progressivo peggioramento delle condizioni di vita e di lavoro, che sfociarono in movimenti di protesta in cui gli stessi italiani furono fattore indispensabile così come era avvenuto nella crescita economica del paese degli anni precedenti
Learning Curve of Totally Endoscopic Non Rib-spreading Mitral Valve Surgery
No full textObjective: Minimally invasive mitral valve surgery has been shown to be transferable through proctoring and careful analysis of surgeons’ performance. Totally endoscopic mitral valve sur- gery without rib spreading represents an advancement in the mitral surgery field. As invasiveness decreases, technical demand increases and careful proctoring and monitoring is required. We use the CUSUM analysis to elucidate the performance and the learning curve of our group switching from standard minimally invasive mitral valve surgery to totally endoscopic approach.
Methods: From July 2015 to April 2018, 177 patents under- went totally endoscopic mitral valve surgery. The procedure was adopted for “all-comers” patients with either isolated mitral and/or tricuspid valve disease. Euroscore II was used to the risk against which the surgical failure was compared to construct the CUSUM curve. Surgical failure was defned as: 1) perioperative death; 2)intraoperative conversion to sternot- omy; 3) perioperative myocardial infarction (new Q- waves >0.04 ms and/or reduction in R-waves >25% in at least two
contiguous leads on electrocardiogram); 4) perioperative aortc dissection; 5) stroke (defined as Rankin Modified scale score >= 6) in-hospital reoperation for any cause. Also we consid- ered surgical procedure end-points of failure as the occur- rence of one or more of the following: 1) cardiopulmonary bypass (CPB) time exceeding 95% of our “conventional MIMVS” CPB tme; 2) cross-clamp (X-clamp) time exceeding 95% of our conventional approach; 3) preparation time exceeding 95% of our current MIMVS setup.
Results: Procedure specific risk adjusted probability of failure, probability of failure during preparation time, prolonged CPB time and prolonged cross clamp time were always in control.
Conclusions: Between 50 and 60 procedures are required to reach the lower boundary to overcome procedure-specific risks, manage the surgical setup and be proficient in the new way of mitral repair as reflected by the cardiopulmonary bypass time and cross-clamping time
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
Platone e la città perfetta
No full textUn esame del pensiero di Platone, e segnatamente della sua visione della città perfetta, in un'opera innovativa che si propone di essere anche un'introduzione critica alla filosofia politic
- …
