1,720,963 research outputs found
INCREMENTAL TIME-SLOT ASSIGNMENT IN SS TDMA SATELLITE SYSTEMS
No full textIn this paper we investigate the problem of incremental time-slot assignment for a satellite switched time division multiple access (SS/TDMA) satellite system in an heterogeneous traffic environment. The traffic in this environment can be categorized into two types: a rapidly changing type composed of packet-switched data traffic, and a relatively static type composed of circuit-switched voice traffic. From the time-slot assignment viewpoint, the problem is to construct an "efficient" TDMA frame that permits the static voice traffice to be transmitted and then, on a frame-by-frame basis to attempt to insert the data packets into the slots that are unused by the voice traffic. We prove that the problem is NP-complete, even for very simple traffic configurations. Several suboptimal fast heuristic algorithms are presented and empirically compared by experiments on randomly generated traffic patterns. The experiments reveal that, on the average, the algorithms give close to the optimal performance
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
Out of hospital outcome and quality of life in survivors of combined acute multiple organ and renal failure treated with continuous venovenous hemofiltration/hemodiafiltration
No full textObjective: To study the out-of-hospital quality of life and long-term survival of critically ill patients with combined multiple organ failure and acute renal failure treated with continuous renal replacement therapy (CRRT). Design: Study based on responses to postal questionnaire and clinical information obtained during treatment in the intensive care unit (ICU). Setting: ICUs of two tertiary institutions. Patients: 85 survivors from a pool of 250 patients with combined acute multiple organ and renal failure who were treated with CRRT. Method and results: Anonymous postal questionnaire based on an activity index, mental function index, and a simplified version of the Nottingham Health Profile. Of the 250 patients, 85 (34 %) survived to be discharged from hospital: 57 males (67 %) and 28 females (33 %), mean age 56.9 years (range 13.4-81). Mean duration of ICU stay was 10.9 days (range 2-52), mean admission Acute Physiology and Chronic Health Evaluation II score was 24.2 (range 15-41), and mean duration of CRRT was 6.2 days (range 1-34). Mean follow-up time was 2.5 years (range 0.1-5.3). Thirty-three of the 85 patients (38.8 %) did not reply to the questionnaire; 35 patients (41.7 %) were alive at the time of response and 17 (20 %) were deceased. Of the 35 responders, 68.5 % were satisfied with their present state of health, despite 60.6 % stating that their mobility had been affected, with 41.9 % being unable to walk more than 200 metres. Most (94.5 %) survivors, however, felt that their treatment had been worthwhile, and 91.2 % said that they would undergo the same treatment again if necessary. The approximate cost for each year of survival was U.S. $ 50 000. Conclusions: In the majority of patients who survived to be discharged from hospital after combined acute multiple organ and renal failure, the overall state of health and quality of life seemed acceptable. Most patients felt that their treatment was worthwhile and that they would undergo the same treatment again if necessary. Our findings suggest that the cost and effort associated with CRRT and ICU care in these patients are high but broadly comparable to those associated with the care of other serious illnesses. They are also seen as worthwhile by survivors, who consider their life to be of acceptable quality
Outcome and quality of life after treatment with hemofiltration/hemodiafiltration - Reply
No full textDispelling 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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