This unmatched case-control study aimed to determine the relationship among caffeine drinks consumption known as "energy drinks consumption", drug dependence and related factors in male construction workers in Chonburi Province. It was conducted during December 15, 2001 and February 15, 2002. Data were collected using interview questionnaires. The logistic regression was used to control possibl...

We schedule appointments with random service durations on multiple servers with operating time limits. We minimize the costs of operating servers and serving appointments, subject to a joint chance constraint limiting the risk of server overtime. Using finite samples of the uncertainty, we formulate the problem as a mixed-integer linear program, and propose a two-stage programming framework whe...

120 P&T® • March 2009 • Vol. 34 No. 3 a blood alcohol concentration of 0.1%, which is above the legal limit for driving in most states.4 When people experience exhaustion, their performance varies widely. One moment performance might be good; the next moment, it’s in adequate as perceptions begin to dis engage during episodes of microsleep (intermittent lapses in consciousness).5 When people ar...

As one of the typical occupations in new forms employment generated by platform economy, a courier has become an important channel for workers to achieve and increase their income. The labour process control platforms led decline experience high mobility, which affected overall stability employment. Using couriers as research target, questionnaire survey was conducted explore influence mechanis...

OBJECTIVES To ascertain the effects of overtime and psychosocial job conditions on the occurrence of non-insulin dependent diabetes mellitus (NIDDM) in Japan. DESIGN An eight year prospective cohort study. SETTING An electrical company in Japan. PARTICIPANTS In 1984, a mailed questionnaire was sent to industrial workers of an electrical company in Japan. After excluding those who had a hi...

In this paper, we study a new variant of the vehicle routing problem (VRP) with time windows, multi-shift, and overtime. In this problem, a limited fleet of vehicles is used repeatedly to serve demand over a planning horizon of several days. The vehicles usually take long trips and there are significant demands near shift changes. The problem is inspired by a routing problem in healthcare, wher...

Physicians' work schedules are an important determinant of their own wellbeing and that of their patients. This study considers whether allowing physicians control over their work hours ameliorates the effects of demanding work schedules. A questionnaire was completed by hospital physicians regarding their work hours (exposure to long shifts, short inter-shift intervals, weekend duties, night d...

OBJECTIVES This study aimed to clarify the association between long working hours and short sleep duration among Japanese workers. METHODS We selected 4,000 households from across Japan by stratified random sampling and conducted an interview survey of a total of 662 participants (372 men; 290 women) in November 2009. Logistic regression analyses were performed using "sleep duration <6 hours ...