This paper proposes an opportunistic maintenance policy for the multi-unit series production system. This proposed maintenance policy is on the basis of the failure rate analysis, which is more realistic than age-based or time-based opportunistic replacement models. When a system halts for performing preventive maintenance or opportunistic maintenance, the alternative decision of replacement an...

The authors reported no conflicts of interest.The Journal policy requires editors and reviewers to disclose interest decline handling or reviewing manuscripts for which they may have a conflict interest. this article We read with the population-based observational study by Sohn colleagues1Sohn S.H. Kang Y. Kim J.S. Hwang H.Y. K.H. Choi J.W. Early long-term outcomes bioprosthetic versus mechanic...

INTRODUCTION Cardiac resynchronization defibrillator (CRT-D) as primary prevention is known to reduce mortality. At the time of replacement, higher age and comorbidities may attenuate benefit implantable cardioverter-defibrillator (ICD) therapy. The purpose this study was evaluate progression after implantation their association with mortality following CRT-D generator replacement. In addition,...

OBJECTIVE To assess mortality associated with hormone replacement in younger and older postmenopausal women. DESIGN A comprehensive search of MEDLINE, CINAHL, and EMBASE databases was performed to identify randomized controlled trials of hormone replacement therapy from 1966 to September 2002. The search was augmented by scanning selected journals through April 2003 and references of identifi...

A deterministic model based on the gene flow method, considering the features of Iranian Holstein cattle population, was implemented in this study to evaluate the effect of altering the number of age-classes in the dams of future sire (DS) path and the number of dams required for breeding a young bull (YB), to be evaluated as future sire, on genetic gain and resultant economic efficiency of a g...

OBJECTIVE To determine the reasons for replacement of composite resin restorations and evaluate the association between the reasons for replacement of restorations with gender, duration of failure and different class of cavities. STUDY DESIGN Cross-sectional study. PLACE AND DURATION OF STUDY Operative Department of Fatima Jinnah Dental Hospital, Karachi, from January to May 2009. METHODO...