1,721,106 research outputs found
IMPLEMENTAZIONE DI MODELLI PER VARIABILI RISPOSTA QUALITATIVE E MISURE PER LA VALUTAZIONE DELLA CAPACITÀ PREDITTIVA: APPLICAZIONE ALLA STADIAZIONE DELLA FIBROSI EPATICA IN PAZIENTI CON EPATITE CRONICA C.
No full textIn the context of medical, epidemiological and health organization research there are many situations in which it is necessary to develop prediction models that identify multiclass categorical variable outcomes, where the latter may be nominal or ordered.
When the outcome variable is binary, consolidated modeling techniques based on logistic function are available. On the contrary, up to now, models for multiple classes outcome, taking into account ordinality or not, were developed from a theoretical point of view but not widespreadly used. Limited software availability and the difficulty in making the results suitable for pratictioners in a simple way are the main reasons for such a limited use. This has leaded to many published studies in wich a dichotomization of the outcome variable was introduced in order to allow the application of the logistic model, thus losing part of the data information and reducing the power of results.
This dissertation provides an overview of the available theoretical models and shows their implementation for a problem of three-classes diagnostic classification of the severity of liver fibrosis in HCV patients. Moreover, a representation of the selected model by means of immediately readable nomograms is also provided
The characteristics of caregivers attending adult and paediatrics patients in a Milan hospital
Full text linkBackground
The role of the caregiver has received increasing attention in recent years. This is due in part to today’s longer life expectancy, which has resulted in a larger population affected by chronic pathologies. But it is also due to the lack of suitable solutions provided by the social and health structures. This research aims to investigate in greater depth the characteristics and the needs of caregivers involved with adult and paediatric patients who are receiving treatment for acute pathologies in hospitals.
Study Design
Questionnaire
Methods
A questionnaire was used that was validated in a previous study. It was administered in the period from March 2014 to January 2015 at the Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico di Milano in six wards. The questionnaire was done anonymously.
Results
We administered 364 questionnaires which enabled us to identify the characteristics of adult and paediatric patients’ caregivers. Those in hospitals are prevalently women. Adult patients’ caregivers tend to be from 40 to 79 years of age, those of paediatric patients from 20 to 59.
Adult patients’ caregivers may often be the husband/wife (35%), or a son/daughter (32%). Paediatric patients’ caregivers for paediatric patients are almost always parents (97%).
The states of mind and the sensations felt by caregivers are anxiety and tension.
Conclusions
The increasing number and severity of the conditions of people needing care, the changing family structures and the economic crisis have compelled caregivers to perform tasks requiring technical skills that should not be expected of them, but which the circumstances do not allow them to evade. It emerges from an analysis of the data provided by this research that fuller use could be made of caregivers’ potentials by involving them to a greater extent in the care process by the healthcare providers
Report relativo a dati statistico-epidemiologici ed economici su diagnosi e trattamento del carcinoma polmonare
No full textrapporto finale per ricerca finanziata dalla ditta ABBO
Characterization of flash structures erased with ultra-short pulses
No full textFlash memories are normally erased by means of high-field electron tunnelling from the floating gate into the source. As a consequence the time needed is generally two orders of magnitude larger (≈ 1 ms vs. ≈ 10 μs) than that used for writing, and is obtained by means of much higher currents due to channel hot electrons. It is important therefore to determine whether it is possible to reduce the erase time, in order to make it comparable with that used for writing. With regard to such a problem, this work describes the results of a comprehensive and detailed characterization of flash structures aimed at evaluating how ultra-short, high voltage erasing pulses affect the reliability of the device. © 1994
Temperature Dependence of Fowler-Nordheim Injection from Accumulated n-type Silicon into Silicon Dioxide
No full textThe temperature dependence of the Fowler-Nordheim (F-N) injection of electrons from accumulated n-Si to SiO2 is analyzed. The F-N current-voltage characteristics of thin-oxide (8.5 nm) 〈100〉-Si(n)/SiO2/poly-Si(n+) MOS capacitors have been measured at different temperatures ranging from 90 to 473 K. The obtained results are explained treating the accumulation layer quantum-mechanically, i.e., taking into account the injection of electrons from quantized energy subbands. In order to facilitate the use of the presented results in compact device simulators, simple analytical expressions which give the F-N current as a function of temperature have been derived from our self-consistent quantum-mechanical calculations. © 1993 IEE
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
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