Search results for "testing"

Establishing Equivalence or Non-Inferiority in Clinical Trials

2012

Background: An increasing number of clinical trials are being performed to show the absence of relevant differences between the effects of two treatments. The primary care physician makes use of the results of so-called equivalence studies, at least indirectly, practically every day. Equally important are active control clinical trials in which the efficacy of a new treatment has to be proven through demonstrating non-inferiority as compared to a standard treatment. Methods: Explanation of basic principles and statistical techniques with reference to the original literature; selective searches in the medical literature. Results: First of all, a suitable distributional parameter must be chos…

Il modulo elastico statico e dinamico del calcestruzzo

2012

Comparison of mechanical properties and composition of magnetron sputter and plasma enhanced atomic layer deposition aluminum nitride films

2018

A comparative study of mechanical properties and elemental and structural composition was made for aluminum nitride thin films deposited with reactive magnetron sputtering and plasma enhanced atomic layer deposition (PEALD). The sputtered films were deposited on Si (100), Mo (110), and Al (111) oriented substrates to study the effect of substrate texture on film properties. For the PEALD trimethylaluminum–ammonia films, the effects of process parameters, such as temperature, bias voltage, and plasma gas (ammonia versus N2/H2), on the AlN properties were studied. All the AlN films had a nominal thickness of 100 nm. Time-of-flight elastic recoil detection analysis showed the sputtered films t…

Benchmark study of undrained triaxial testing of Opalinus Clay shale: Results and implications for robust testing

2021

Triaxial testing of argillaceous rocks and shales is significantly more challenging than conventional rock mechanical testing. The challenges are mainly related to the very low permeability of these geomaterials, and their sensitivity to exposure of atmosphere and brines, which induces variations of water content, suction and effective stress. There are currently no international standards to guide service laboratories for robust testing procedures for shales. A benchmark study of undrained triaxial testing was therefore initiated with three leading service laboratories in shale testing, performing 13 tests and using two different methods of establishing sample saturation prior to deformati…

Validity of a novel device for indoor analysis of cyclists' drag area

2021

Cyclists need to measure aerodynamic resistance accurately and reliably, as well as economically. Devices such as Notio Aerostick, an equipment device that includes one pitot tube, have appeared for this purpose. The aim of this study is, therefore, to test the reliability and degree of agreement in the evaluation of the CdA (coefficient of aerodynamic drag), assessed by means of the Notio Aerostick compared to the Virtual Elevation (VE) and Martin mathematical models.Seventeen professional cyclists rode in a 250-metre-long velodrome covered with a concrete surface with their own time trial bikes. Each cyclist completed three rides of 15 laps at constant speed for the evaluation of the CdA,…

Revista electrónica de investigación y evaluación educativa

2014

Actualmente existe un interés creciente por la calidad educativa y la atención a la diversidad. En este trabajo se presenta un análisis de dos aspectos importantes: el “Contexto” en el que el centro debe de desarrollar su actividad y  las “metas y objetivos” que un centro educativo debe definir para dar una respuesta de calidad a la diversidad. Analizaremos el grado de importancia para los profesores y el nivel de cumplimiento en los centros, a partir de los datos obtenidos en dos cuestionarios. El estudio se realizó con profesores de la provincia de A Coruña (España). En líneas generales podemos decir que los aspectos analizados son considerados importantes por los profesores como indicado…

The Comparison of Software Reliability Assessment Models

2015

Abstract The reliability of the software represents one of the most important attributes of software quality, and the estimation of the reliability of the software is a problem hard to solve with accuracy. Nevertheless, in order to manage the quality of the software and of the standard practices in an organization, it is important to achieve an estimation of the reliability as accurate as possible. In the present work there are described the principles and techniques which underlie the estimation of the reliability of the software, starting from the definition of the concepts which express the attributes of software quality. It is taken into account the issue of the estimation of a software…

Instrument to study rater behaviour: Rater uncertainty and its impact on the quality of assessment in the official language examination, the National…

2023

This research instrument was developed for a study on the uncertainty experienced by language raters and the impact of uncertainty on the quality of assessment in the official language examination, the National Certificates of Language Proficiency. The instrument consists of three online questionnaires using Webropol software and a note-taking sheet using Excel spreadsheet software. The survey focused on the assessment of speaking and writing in the intermediate-level Finnish language examination. The questions in the survey include both closed and open questions. Two almost identical versions of all the questionnaires and the Excel sheet were created for the collection of data for the diff…

Hemodynamic Changes During Physiological and Pharmacological Stress Testing in Healthy Subjects, Aortic Stenosis and Aortic Coarctation Patients–A Sy…

2019

Introduction: Exercise testing has become a diagnostic standard in the evaluation and management of heart disease. While different methods of exercise and pharmacological stress testing exist, only little is known about their comparability. We aimed to assess hemodynamic changes during dynamic exercise, isometric exercise, and dobutamine stress testing at different stress intensities in healthy subjects and patients with aortic stenosis (AS) and aortic coarctation (CoA).Methods: A systematic literature search (PROSPERO 2017:CRD42017078608) in MEDLINE of interventional trials was conducted to identify eligible studies providing evidence of changes in hemodynamic parameters under different st…

Puheen ymmärtämisen tehtävien taitotasoille asettaminen Yleisissä kielitutkinnoissa

2016

The aim of this study is to explore rater effects, such as consistency and severity of the judgements of 12 expert judges, and to report the extent of assessment criteria used by them. The data of the study are based on the three different phases of the standardization procedure which were analyzed using the MFRM model. In addition, feedback gathered from the expert judges was used to find out their opinions about the procedure and to validate the results of the standardization. The results of this study indicate that general discussion on and statistical information about the items influenced judges’ consistency and severity and their adaptation of the assessment criteria. The judges thems…