Search results for " rice"

Manager’s and citizen’s perspective of positive and negative risks for small probabilities

2011

So far „risk‟ has been mostly defined as the expected value of a loss, mathematically PL, being P the probability of an adverse event and L the loss incurred as a consequence of the event. The so called risk matrix is based on this definition. Also for favorable events one usually refers to the expected gain PG, being G the gain incurred as a consequence of the positive event. These “measures” are generally violated in practice. The case of insurances (on the side of losses, negative risk) and the case of lotteries (on the side of gains, positive risk) are the most obvious. In these cases a single person is available to pay a higher price than that stated by the mathematical expected valu…

Statistical issues in the development of an automotive on-board diagnostics

2008

The automotive on-board diagnostics (OBD) is a complex system whose aim is to monitor the state-of-health of another complex system, i.e. the vehicle engine. OBD aimed at the containment of polluting exhaust emissions is nowadays compulsory on every vehicle model introduced into the market. Increasingly stringent regulations and ever more demanding customers push from opposite sides towards a perfect working of OBD systems. Therefore manufacturers are globally interested in the high robustness and reliability of such critical systems. The aim of this presentation is to give an insight into the main statistical problems arisen during an extensive research project carried out in collaboration…

Focus on failure avoidance and risk reduction through Variation Mode and Effect Analysis

2009

Variation Mode and Effect Analysis (VMEA) is a quality improvement tool initially thought to help product development engineers focusing on variation. The method was inspired by the wide use of Failure Mode and Effect Analysis (FMEA) in business and industry and the increased attention on robust design. However, FMEA is based on the concept of failure while VMEA is developed on the concept of variation, i.e. it implies a step further toward the awareness of variation and its implications in terms of risk and failures. VMEA helps identifying, scrutinizing and measuring the sources of variation and the way they channel through and impact on important characteristics of the system under study.…

Statistical-based tolerance setting by eliciting the loss function reasoining

2009

An issue still open in the statistical-engineering literature concerns the tolerance allocation, i.e. the setting of admitted limits for critical characteristics or performances of interest of the system under study. A common approach to tolerance allocation is based on the idea of Loss function initially developed by Taguchi. Unfortunately, some obstacles prevent from a full exploitation of the Taguchi approach, since despite its clarity and elegance, it is poorly operational. Based on Taguchi’s proposal, researchers have been more concerned on developing different analytical models of loss function than clarifying the reasoning behind the loss function idea. So there is a missing link for…

AQM Stability in Multiple Bottleneck Networks

2004

In this paper, we highlight that multiple bottlenecks can affect the performance of active queue management controllers, which are usually configured on a single bottleneck basis, as if each controller were the only element regulating the TCP traffic along its path. To see this, we consider a network scenario where RED is configured at each router, according to previously developed control theoretic techniques. These configuration rules assure stability in a single bottleneck scenario. Yet, we show that instability may arise when two link become congested. We justify this result through a multiple bottleneck model and give guidelines for new cooperative AQM controllers.

APPLICAZIONE DELLO SCREENING DEL TUMORE COLON-RETTALE IN SICILIA: ATTUALITA' E PROSPETTIVE

2010

La metodologia adottata

2012

Lo SCaT – Codice di Analisi dello Stile del Campo Terapeutico: Sviluppi e validazione di uno strumento per l’analisi del campo terapeutico di gruppo

2005

Recenti scoperte a Gela: il sacello suburbano di Piazza Gorizia

2012

In the winter of 2001-2002, an emergency excavation uncovered another suburban sanctuary in the periphery of ancient Gela (Piazza Gorizia). During the excavations remains of a sacellum and a votive depot datable at the end of 5th century BC were found.

Il restauro urbano del Nucleo Sperimentale nel Borgo Ulivia a Palermo

2007

I principi progettuali del quartiere modello di Samonà dove viene messa in pratica la teoria dell’unità architettura-urbanistica, saggio breve pubblicato nei Quaderni del Dottorato di Ricerca in Progettazione Architettonica.