A loose **classification** of longevity theories would separate the functional theories — how senescence proceeds in the individual organism — from the teleological theories, which seek to explain why a given pattern of senescence ought to be so, usually from the evolutionary perspective. We focus here on the loose class of functional theories allied to engineering reliability theory. The link ...

Research in traditional reliability theory is based mainly on probist reliability, which uses a binary state assumption and classical reliability distributions. In the present paper the binary state assumption has been replaced by a fuzzy state assumption, thereby leading to profust reliability estimates of a repairable system, which is modeled as a four unit gracefully degradable system using ...

In this study, we proposed a method to find the fuzzy reliability of the network using fuzzy sum-of-disjoint product technique. We use the fuzzy graph theory techniques for addressing the reliability of a network with known minimal paths. We have also presented an efficient algorithm to find the reliability of the network.

Background: Considering the importance of preventing smoking hookah in adolescents and the lack of a standard questionnaire in this field, this study aimed to develop and validate a Persian Preventing Hookah Smoking (PHS) Questionnaire in adolescents based on the Protection Motivation Theory. Materials and Methods: After conducting focus groups discussion, reviewing the literature and scientifi...

In this issue, Gafni et al.1 provide a strong and timely case for evaluating the reliability and validity of multi-station selection centres (SCs, sometimes referred to as assessment centres). In developing this important research topic, we highlight: (i) important differences between SCs and objective structured clinical examinations (OSCEs); (ii) the importance of demonstrating the construct ...

Service reliability in a distributed queuing system can be assessed by means of the probability of successfully serving queued tasks in a heterogeneous network of nodes. Moreover, randomness in delays imposed by the communication medium adds to the uncertainties in the shared information among these faulty nodes, which complicates the dynamics of the queuing system. A novel approach based on st...

To develop a general reliability theory taking into account various sources of information and a lack of satisfactory data on which estimates of system parameters can be based, the theory of imprecise probabilities can be used. The purpose of the paper is to study structural reliability based on the imprecise probability models taking into account the ageing aspect of the lifetime distributions...

Medical Surgical Nursing is one of the major subjects in nursing. This study examined the validity and reliability of the achievement examination utilizing the Classical Test Theory and Item Response Theory. The study answered the following objectives specifically : ( a) To establish the validity and reliability of the achievement examination utilizing Classical Test Theory and Item Response Th...

Abstract To improve organisational safety and enhance security efficiency, organisations seek to establish a culture of that provides foundation for how employees should approach security. There are several frameworks models provide set requirements forming cultures; however, many organisations, the difficult meet, if not impossible. In this research, we take different perspective focus on core...