Introduction: Shift work is one of the social phenomena that has its roots in the history of human origin and still exists today for economic and technological reasons. Due to the complications of shift work, the present study was conducted to investigate job fatigue, quality of life, and sleep of shift staff working in Ilam Electric Distribution Company. Materials and Methods: In this descrip...

  Background and Aims     Shift work is an inevitable result of technology usage and considered as an occupational hazard. It is known as an old problem among health care workers, which affects their wellbeing adversely. Operation room technicians (ORTs) are among those health care workers who are required to work in shift system and encountered shift work-related problems. This study was condu...

  Background and aims: Security personnel of hospitals in Iran are one of shift worker groups that are affected more than of other shift workers.   Methods: This study was performed in 3 hospitals of Shiraz University of Medical Sciences and 130 workers of security personnel were evaluated. Data of shift workers were collected with Survey of Shift workers (SOS) questionnaire and at the same tim...

Haulage in open-pit mines allocates half of operational costs. Improvement in this system has significant effects in decrease of costs and increase of efficiency. Productivity in mines is a mixture of machinery efficiency and implementation of production strategies. In this paper after classifying dispatching models in open-pit mines, a new mathematical model will be introduced, to execute at t...

there has been a gradual shift of focus from the study of rule systems, which have increasingly been regarded as impoverished, … to the study of systems of principles, which appear to occupy a much more central position in determining the character and variety of possible human languages. there is a set of absolute universals, notions and principles existing in ug which do not vary from one ...

Background: Considering the important role of rest and absence of tension in working environment and consequently promotion of working efficiency, finding ways with the best choices to reduce job stress, seems necessary. Municipality of Tehran with a huge number of employees and with the aim to reduce stress and promote work efficiency is studying this matter seriously. The aim of the present s...