262 research outputs found
Further clarifications about the success-index
No full textThe aim of this brief communication is to reply to a letter by Kosmulski (Journal of Informetrics 6(3):368-369, 2012), which criticizes a recent indicator called "success-index". The most interesting features of this indicator, presented in Franceschini et al. (Scientometrics, in press), are: (i) allowing the selection of an "elite" subset from a set of publications and (ii) implementing the field-normalization at the level of an individual publication. We show that the Kosmulski's criticism is unfair and inappropriate, as it is the result of a misinterpretation of the indicato
A wireless sensor network-based approach to large-scale dimensional metrology
No full textIn many branches of industry, dimensional measurements have become an important part of the production cycle, in order to check product compliance with specifications. This task is not trivial especially when dealing with largescale dimensional measurements: the bigger the measurement dimensions are, the harder is to achieve high accuracies. Nowadays, the problem can be handled using many metrological systems, based on different technologies (e.g. optical, mechanical, electromagnetic). Each of these systems is more or less adequate, depending upon measuring conditions, user's experience and skill, or other factors such as time, cost, accuracy and portability. This article focuses on a new possible approach to large-scale dimensional metrology based on wireless sensor networks. Advantages and drawbacks of such approach are analysed and deeply discussed. Then, the article briefly presents a recent prototype system - the Mobile Spatial Coordinate-Measuring System (MScMS-II) - which has been developed at the Industrial Metrology and Quality Laboratory of DISPEA - Politecnico di Torino. The system seems to be suitable for performing dimensional measurements of large-size objects (sizes on the order of several meters). Owing to its distributed nature, the system - based on a wireless network of optical devices - is portable, fully scalable with respect to dimensions and shapes and easily adaptable to different working environments. Preliminary results of experimental tests, aimed at evaluating system performance as well as research perspectives for further improvements, are discusse
A proposal of a new paradigm for national quality certification systems
No full textThe goal of this paper is to suggest a new incentive model that is capable of creating the conditions for the autonomous growth of diffusion and credibility of the ISO 9000 national quality certification syste
ISO/TS 16949: analysis of the diffusion and current trends
No full textThe automotive industry has always shown a particular interest toward quality management systems, which resulted in the development of several different specific standards. As a result of this, by the mid-1980s, automotive suppliers were subject to numerous national and customer specific regulations. The proliferation of these standards and the need to create a single reference model led to Technical Specification (TS) 16949, an ISO technical specification aimed at representing a comprehensive quality management system for the global automotive industry. Since its early introduction, TS 16949 has encountered a certain success thanks to its feature of unifying and harmonizing the already existing standards. This paper studies the global evolution and diffusion of this technical specification, observing its impact on the local economies. The argument is supported by many empirical data
The Mobile Spatial coordinate Measuring System II (MScMS-II): system description and preliminary assessment of the measurement uncertainty
No full textAccording to the increasing interest in metrological systems for the dimensional measurements of large-size objects in a wide range of industrial sectors, several solutions based on different technologies, working principles, architectures, and functionalities have recently been developed. Among all, the most flexible and easily transportable solutions are those that have aroused most interest and have found greater success. In order to address the needs of Large-Scale Metrology (LSM) applications, a distributed flexible system based on a network of low-cost InfraRed (IR) sensors - the Mobile Spatial coordinate Measuring System II (MScMS-II) - has been developed at the Industrial Quality and Metrology Laboratory of Politecnico di Torino. This paper presents a preliminary uncertainty assessment of the system referring to the measured point coordinates in the 3D space, focusing on the sources of measurement uncertainty and the related propagation laws. A preliminary metrological characterization of MScMS-II architecture, experimentally evaluated through a system prototype, is also presented and discussed
METODO PER LA TARATURA DI UN SISTEMA DI MISURA LVM IBRIDO
No full textLa presente invenzione si riferisce ad un metodo per il calcolo dei parametri estrinseci di una rete di sensori per Large-Volume Metrology (LVM); detta rete di sensori LVM comprende almeno un primo tipo di sensori LVM ed un secondo tipo di sensori LVM. Il metodo oggetto della presente invenzione comprende i seguenti passi: (i) acquisire una o più misure mediante ciascuno di detti sensori LVM ed un dispositivo tastatore disposto in una pluralità di punti all’interno di un volume di misura, detto dispositivo tastatore comprendendo almeno un primo target compatibile con detto primo tipo di sensore LVM ed un secondo target compatibile con detto secondo tipo di sensore LVM; (ii) definire un sistema di equazioni combinato comprendente dette una o più misurazioni ottenute da detta rete di sensori LVM; e, (iii) determinare i parametri estrinseci della rete di sensori LVM in funzione del sistema di equazioni combinato
Imaging tissue regeneration/degeneration by combined X-ray micro-diffraction and phase contrast micro-tomography
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