In this chapter, we will introduce the basic concepts that constitute what is known as ReliabilityCentered Maintenance. Initially, however, we will briefly discuss how PM has evolved in the industrial world, and most importantly, we will look at how one of the basic tenets of reliability engineering—the “bathtub curve”—can and should influence the formulation of PM tasks. Next, we will look at ...

epidemiology is the study of disease distribution and factors determining or affecting it. likewise, endodontic epidemiology can be defined as the science of studying the distribution pattern and determinants of pulp and periapical diseases; specially apical periodontitis. although different study designs have been used in endodontics, researchers must pay more attention to study designs with h...

Sedentary time (too much sitting) increasingly is being recognized as a distinct health risk behavior. This paper reviews the reliability and validity of self-reported and device-based sedentary time measures and provides recommendations for their use in population-based studies. The focus is on instruments that have been used in free-living, population-based research in adults. Data from the 2...

When starting a new journal, Clinical Epidemiology, it is important to defi ne some key concepts, our mission, and to delineate our discipline. The classic concept of epidemiology is an old discipline with centuries-old roots. It is a discipline of central importance for public health and its impact for clinical medicine has increased over the last few decades. 1 Epidemiology can thus be broadl...

[Purpose] This study examined the reliability of a clinical ability evaluation table developed in a previous study with the aim of clarifying the abilities necessary for therapists to independently implement their duties. [Subjects and Methods] Forty-eight physical therapists with less than 2 years of clinical experience were targeted for evaluation, 48 main supervisors, and 48 sub-supervisors,...

Although considered as not safety critical (safety function being performed by other sub-systems), railway supervision systems can contribute to hazardous scenarios. It is of primary importance to identify this type of scenarios and evaluate the behaviour of human operators. A state of the art in human reliability is presented. This article presents an experimental protocol based on an automati...

One of the main problems in genetic epidemiology is to robustly predict genetic susceptibility to complex diseases based on the data from case/control studies. This becomes computationally challenging in presence of interactions between multiple genes. In order to efficiently search through enormous amount of possible combinations, it is necessary to apply heuristics and the greedy approach has...

Questionnaires are the most used subjective instrument of measurement in respiratory epidemiology. The standardisation of the questionnaires aims to limit bias by maximising validity and reliability, and comparability. Within the European Union project BIOMED1, a compendium of respiratory standard questionnaires (CORSQ) was developed for adults covering 18 topics from general information to ear...