Most probabilistic risk assessment (PRA) and reliability methods commonly used at Johnson Space Center (JSC) make the assumption that component failures in a system are independent random occurrences. There are some exceptions (e.g. modeling common cause events), but because of the mathematical complications that occur when full dependency is assumed, it is not done by the standard models. This...

In this paper, a K-out-of-N:G system with N categories of components is studied. Each component category is characterized by its own failure and repair rates. There are R repair facilities, and repair priorities are specified between the N non-identical components. An algorithm for automatic construction of the system state transition diagram is presented. The stationary availability of each co...

The relationship between a Lubrication Mode Diagram (LMD) for concentrated contacts (LCC‘s) and the ‘IRG transition’ diaLubrication Modes and the IRG Transition D i ag ram gram has been studied. In addition, scuffing results, obtained by the IRG (International Research Group) have been analysed, as well as the results of scuffing tests performed by different workers using a two-disc apparatus. ...

In this little pocket-book of 60 Pa.^?' a_ student will find a good deal of usefu tiou put simply and clearly. The text is illustrated with diagrams, showing the characteristics of the murmurs as to time, length and roughness. The book may easily be used for clinical reference and should prove of value to the beginners in acquiring the elements of cardiac ascultation. Many valuable hints are in...

Previous research suggests that decision makers have the tendency to keep on investing in losing courses of action. The present study focuses on de-escalation and proposes causal loop diagrams as a technique to decrease escalating commitment in a failing action. The effectiveness of causal loop diagrams is also contrasted with the effect of receiving a list of important factors. Causal loop dia...

The statechart diagram is a behavior in the unified modeling language (UML) diagram. Numerous state chart diagrams are taught computer science majors. In teaching and learning activities, assessment process essential. A teacher required to be objective assessing. However, objectivity can affected by inconsistency fatigue. Thus, an automatic very important. Automatic assessments help teachers sa...

the present paper deals with development of a simulation model for the performance evaluation of feed water system of a thermal power plant using markov birth-death process and probabilistic approach. in present paper, the feed water system consists of four subsystems. after drawing transition diagram for feed water system, differential equations are developed and then solved recursively using ...