concluding that overtime work has a relationship with short sleep duration (<6 hours/day) even at 26 hours/ month. Virtanen et al. reported a cross-sectional study and two longitudinal studies that examined the relationship between long working hours and short sleep duration. A significant odds ratio for short sleep duration (<7 hours/day) was observed in a case-control study when weekly workin...

BACKGROUND Cobalt is one of the most important constituent present in ceramic industries. Glazers are the relevant workers when they are producing blue colored ceramic, causing occupational exposure to such metal. Through this study, urinary cobalt was determined in glazers in a ceramic industry when they were producing blue-colored ceramic glazes. METHODS In this case-control study, spot uri...

BACKGROUND The occupational health and safety implications associated with compressed and extended work periods have not been fully explored in the mining sector. AIMS To examine the impact on employee health and safety of changes to the roster system in an Australian coal mine. METHODS Absenteeism and incident frequency rate data were collected over a 33 month period that covered three dif...

Many professions in the fields of engineering, aviation and medicine employ this form of scheduling. However, on-call work has received significantly less research attention than other work patterns such as shift work and overtime hours. This paper reviews the current body of peer-reviewed, published research conducted on the health effects of on-call work The health effects studies done in the...

This paper tries to trace our research history briefly from Barlow and Proschan to attain general replacement models. We begin with a random age replacement policy that is planned at a random time Y and call it as random replacement. When the distribution of Y becomes a degenerate distribution placing unit mass at T, age replacement is formulated. We obtain the general formulas for optimum repl...

We propose a new approach for scheduling with strict deadlines and apply this approach to the TimeConstrained Project Scheduling Problem (TCPSP). To be able to meet these deadlines, it is possible to work in overtime or hire additional capacity in regular time or overtime. For this problem, we develop a two stage heuristic. The key of the approach lies in the first stage in which we construct p...

Patients' risks from medication errors are widely acknowledged. Yet not all errors, if they occur, have the same risks for severe consequences. Facing resource constraints, policy makers could prioritize factors having the greatest severe-outcome risks. This study assists such prioritization by identifying work-related risk factors most clearly associated with more severe consequences. Data fro...

In Japan, death from overwork (“karoshi” in Japanese) is the focus of social concern. Extremely long work hours and deprivation of sleep exert vital exhaustion and mood changes, resulting in disease conditions such as depression and ischemic heart disease . As the prevention of diseases caused by heavy overtime schedules is a live issue in Japan, decisive and objective indicators are necessary ...