Search results for " Opera"
showing 10 items of 3606 documents
Maxillary first molar with three mesiobuccal canals confirmed with spiral computer tomography
2012
Anatomic variations in root canal morphology have become easier to detect with the rapid advancements in clinical and diagnostic aids. Also an increased awareness of unusual anatomic morphology and a better understanding of the root canal system guides the clinician in diagnosis and treatment of such variations in order to achieve a successful endodontic outcome. Mesiobuccal root of first maxillary molar teeth have been considered to be one of the most complex and challenging root canal systems. This case report presents a successful management of a third canal in the mesiobuccal root of permanent maxillary first molar using dental operating microscope along with a modified access preparati…
In-house versus external basic research and first-to-market innovations
2016
This paper explores to what extent conducting internal basic research, as opposed to external basic research (i.e. outsourcing and collaboration with universities) encourages firms to bring new products into the market ahead of competitors, and contributes to innovation performance. The analysis is based on a sample of Spanish manufacturing firms over the period 2006–2012. Our findings suggest that conducting in-house basic research affects firm's propensity to introduce product novelties. Furthermore, performing this activity continuously affects the probability of being product-pioneer in low and medium–low tech sectors. Collaboration with universities also helps in introducing new produc…
Using Induced Ordered Weighted Averaging (IOWA) Operators for Aggregation in Cross-Efficiency Evaluations
2014
This paper proposes an enhancement of the cross-efficiency evaluation through the aggregation of cross-efficiencies by using a particular type of induced ordered weighted averaging IOWA operator. The use of a weighted average of cross-efficiencies for the calculation of the cross-efficiency scores, instead of the usual arithmetic mean, allows us to introduce some flexibility into the analysis. In particular, the main purpose of the approach we present is to provide aggregation weights that reflect the decision maker DM preferences regarding the relative importance that should be attached to the cross-efficiencies provided by the different decision-making units. To do it, an ordering is to b…
EPA-0552 – Social rehabilitation and employment of people with intellectual disabilities
2014
Background Experience in the field of professional and social activation and employment of people with moderate and severe intellectual disabilities indicates the need to seek specific strategies for solving problems on the way into the labor market of people recruited from this social group. The analysis of the limitations and difficulties in recruiting these people, and based on samples taken before employing them on the open market, gave birth to the concept of developing an innovative system to support candidates for employment. Methods The development of the Project’Our work - preventing discrimination against disabled people in access to work, preceded by a very detailed analysis of t…
A Multi-Objective Design Approach for the c Chart Considering Taguchi Loss Function
2013
The present paper proposes a multi-objective design approach for the c chart, considering in the optimization process of the chart parameters both the statistical and the economic objectives. In particular, the minimization of the hourly total quality related costs is the considered objective to carry out the economic goal, whereas the statistical objective is reached by the minimization the out-of-control average run length of the chart. A mixed integer non-linear constrained mathematical model is formulated to solve the treated multi-objective optimization problem, whereas the Pareto optimal frontier is described by the e-constraint method. In order to show the employment of the proposed …
Comparing the Economic Effectiveness of Various Adaptive Schemes for the c Chart
2013
In an attempt to improve the effectiveness of statistical process control (SPC) procedures, a variety of adaptive schemes has been developed in the last decades. However, considering control charts for attributes, relatively few works about adaptive schemes have been proposed, and most of them were proposed only recently. The common characteristic of those schemes is that one or more chart parameters are allowed to adaptively vary during the SPC operations according to the sampling information history, typically the current point plotted on the chart. In this way, the adaptive schemes are smarter than the related static ones, but they are also more complicated in terms of implementation. Th…
An Effective Double Sampling Scheme for thecControl Chart
2013
In the present paper is developed a statistical process control inspection procedure based on a new simple-to-implement and effective double sampling scheme for the c control chart, aimed at the minimization of the number of inspected observation units and warranting fixed levels for the type I and II error risks. In particular, the formulations of the false alarm risk α, the power P of the chart, and the expected number of inspected observation units for the developed inspection procedure are given, whereas a macro of Microsoft Excel is adopted to solve the tackled problem. In order to illustrate the application of the developed approach and to investigate on the influence of several opera…
Economic Design Approach for an SPC Inspection Procedure Implementing The Adaptive C Chart
2013
The present paper proposes a design approach for a statistical process control (SPC) procedure implementing a c control chart for non-conformities, with the aim to minimize the hourly total quality-related costs. The latter take into account the costs arising from the non-conforming products while the process is in-control and out-of-control, for false alarms, for assignable cause locations and system repairs, for sampling and inspection activities and for the system downtime. The proposed economic optimization approach is constrained by the expected hourly false alarms frequency, as well as the available labor resource level. A mixed integer non-linear constrained mathematical model is dev…
Artesanías evanescentes de la Edad del Hierro en la península Ibérica
2020
El proyecto «Madera, hueso, marfil, asta y concha. ¿Artesanías marginales o marginadas?» (HAR2013-45770-P) (2014-2017) se inició como continuidad de los proyectos de investigación desarrollados sobre la flora y la fauna de los iberos (2004-2012). En él se recogen útiles y adornos realizados en materias orgánicas de origen animal y vegetal de época ibérica que han pasado desapercibidos para la investigación. Por falta de financiación se han tratado menos a fondo las materias primas vegetales y malacológicas. Por su parte, para las materias duras animales se han analizado las cadenas operativas al completo (tratamiento, elaboración y consumo), los objetos elaborados, las formas de transmisión…
Piezas de hueso, asta, cuerno y marfil en época ibérica. De su elaboración a su interpretación
2019
Este trabajo tiene como objetivo principal analizar y dar visibilidad a los objetos elaborados sobre materias duras de origen animal (hueso, asta, cuerno y marfil) de época ibérica (s. VI – s. I a. C.). La revisión de los objetos se ha centrado en los recuperados en espacios de hábitat con el objetivo de documentar posibles lugares de elaboración de este tipo de artesanías dentro de los poblados iberos. Los artefactos han sido estudiados desde perspectivas múltiples. Así, en primera instancia todos los objetos han sido analizados anatómica y taxonómicamente con la finalidad de documentar qué especies animales y qué partes anatómicas se emplearon para su manufactura. Se han considerado tanto…