This study investigates the issue of optimal preventive replacement scheduling for a repairable system, considering its failure/repair history and environment or degradation, as characterised by covariates. The proposed approach is developed within recurrent event modelling framework, in which failure behaviour system defined intensity, perfect replacements imperfect corrective repairs are inte...

We conducted a study to compare the clinical results and operative times of knotted and knotless fixation of anterior and posterior glenohumeral labral repairs and superior labrum anterior to posterior (SLAP) repairs. We retrospectively evaluated data that had been prospectively collected from a Surgical Outcomes System database. Knotted and knotless techniques for 226 repairs (59 isolated ante...

This paper investigates the optimal threshold value of failure rates for leased products with a Weibull lifetime distribution. Within a lease period, any product failure is rectified by minimal repairs and the lessor may incur a penalty when the time required to perform a minimal repair exceeds a reasonable time limit. To reduce product failures, additional preventive maintenance actions are ca...

With the expanding use of laparoscopic techniques in female urology, there has been a surge in interest for incorporating minimally invasive approaches to pelvic organ prolapse repair and uterine preservation procedures. These approaches have the potential to combine the success, versatility, and durability of the traditional open abdominal repairs with the minimal invasiveness and recovery aff...

Traumatic aortic rupture requires rapid, definitive repair for optimal outcome, particularly with respect to distal neurologic function. Over the past 10 years, the R Adams Cowley Shock Trauma Center of the University of Maryland has used partial cardiopulmonary bypass without systemic heparization exclusively for all repairs of the descending aorta. A heparin-bonded circuit allows for controll...

We consider here scalar aggregation queries in databases that may violate a given set of functional dependencies. We define consistent answers to such queries to be greatest lowest/least upper bounds on the value of the scalar function across all (minimal) repairs of the database. We show how to compute such answers. We provide a complete characterization of the computational complexity of this...

Data provenance approaches track how the answer to a database query derive from input items; however, prior approaches used “positive” provenance and were not directly usable for explaining “expected” but missing answers. A similar problem arises with the failure of integrity constraints. Our perspective is to offer explanations via possible (minimal) repairs using provenance. This is useful fo...