1,723,168 research outputs found
I. Regular and chaotic motions in a wave tank, II, interactions between a free surface and a shed vortex sheet
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1992.Includes bibliographical references (leaves 142-143).by Wu-ting Tsai.Ph.D
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
Social-aware D2D communications: qualitative insights and quantitative analysis
No full textWith emerging demands for local area services, device-to-device communication is conceived as a vital component for the next-generation cellular networks to improve spectral reuse, bring hop gains, and enhance system capacity. Ripening these benefits depends on efficiently solving several main technical problems, including mode selection, resource allocation, and interference management. Aiming to establish a new paradigm for solving these challenging problems in D2D communication, in this article we propose a social-aware enhanced D2D communication architecture that exploits social networking characteristics for system design. By developing a profound understanding of the interplay between social networks’ properties and mobile communication problems, we qualitatively analyze how D2D communications can benefit from social features, and quantitatively assess the achievable gains in a social-aware D2D communication system
1026: U.S. opioid prescribing practices after ICU hospitalizations requiring mechanical ventilation
No full textMetricsIntroduction: Opioids, frequently initiated during ICU admissions requiring invasive mechanical ventilation (IMV), are often continued after hospital discharge despite important concerns re: this use. Current U.S. post-hospital use of opioids in ICU survivors who required IMV and factors associated with this use remain unclear.Methods: Using the U.S. IQVIA PharMetrics Plus claims database we identified adults in 2021 admitted to an ICU requiring IMV and discharged directly to home with insurance coverage ≥30 days. We excluded patients with OUD or a recent ICU admission. We collected data on age, sex, comorbidity (CCI), frailty (HFRS), admission diagnoses, and full opioid agonist prescriptions in the two months before-and-after the ICU hospitalization and conducted a 5-variable logistic regression analysis to identify factors associated with post-hospitalization opioid prescribing in patients opioid-naive prior to ICU hospitalization.Results: Among 2707 patients included, 2341(86.5%) were opioid-naïve [age 67(57-76), male(56.3%), CCI 5(3,8), HDRI 11(6,18) and surgical(14.4%] and 364(13.5%) were opioid-experienced. A total of 197(8.4%) opioid-naive patients were prescribed ≥1 opioid in the 2-months after ICU hospitalization. First-prescribed opioids included oxycodone 115(58.3%), hydrocodone 70(35.5%), codeine 16(8.1%) and transdermal fentanyl 1(0.5%)]; acetaminophen-containing opioid formulations made up 56.7% of these prescriptions. In the opioid-naïve group, a surgical (vs. medical) diagnosis (aOR 6.41 95%CI 4.67,8.79) was associated with greater post-hospital opioid prescribing and age (aOR 0.98 95%CI 0.97,0.99], male gender (aOR 0.74 95%CI 0.87,1.40), and baseline comorbidity (aOR 0.99 95%CI 0.94,1.04) were associated with less. Opioids were not prescribed post-hospitalization in 168/364(48.7%) of the opioid-experienced patients. The total 2-month oral MME prescribed was greater in the 177 opioid-experienced patients prescribed opioids post-hospitalization than the 364 opioid-experienced patients before hospitalization [1350(341,2535) vs 815(150,2062),p=0.01]Conclusions: Post-hospital opioid prescribing after an ICU admission requiring IMV appears to be lower in the U.S. than that reported in other countries for both opioid-naive and opioid-experienced patients.<br/
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