background: work-related musculoskeletal disorders (wmsds) are a leading cause of disability and workers compensations. objectives: the research was done in tehran pars-electric factory to prevent inducing wmsds. rapid entire body assessment (reba) was carried out to assess musculoskeletal loads on workers due to their postures, repetition, and force. nordic musculoskeletal questionnaire (nmq) ...

in this paper, the mean value of strain energy density criterion has been used to predict the critical fracture load in specimens with u-shaped notch under bending loads. an equation for calculation of averaged strain energy density in this zone has been presented. bending loads under mode i have been considered. two cases have been studied: 1) the control volume only includes the semicircular ...

In this paper we develop a possible notion of shortterm value-based reliability for operating an electric power network. As the electric power industry goes through the restructuring process, the operation based on the value-based reliability may be more appropriate than based on the traditional (N1) security criteria. The value-based reliability requires a framework where the factors to be con...

The multi-activity multi-task shift scheduling problem consists in assigning interruptible activities and uninterruptible tasks to a set of employees in order to satisfy a demand function. In this paper, we consider the personalized variant of the problem where the employees have different qualifications, preferences, and availabilities. We present a branch-and-price algorithm to solve this pro...

In this paper we present the development of a simulation model for large consumers to optimise their consumption and reserve offers in a security constrained electricity market. We utilise the New Zealand grid, which has security constrained generation and transmission which can influence marginal nodal pricing. To illustrate this influence we use a series of small optimal power flow models as ...

1.Introduction Following several methods of some past publications, among these we refined an important idea that related queries could be derived from queries submitted within the same session. As the browsers not just provide the previous queries but more informations,so we could use these informations to build a expert database for a special user, base on the database ,we could analysis some...

This paper presents an insole FSR (Force Sensing Resistor) to dynamically detect weight variations in an exoskeleton system. The proposed methodology is intended for tasks of lifting and lowering heavy weights with an industrial exoskeleton to substantially reduce spinal loads during these manual handling activities. Instead of extensively placing high-dense force sensors by covering the whole ...

The growing interest with the developments of renewable sources owing to less environmental pollution creates challenges for grid operators. Virtual Power Plant (VPP) is a novel concept that will integrate small distributed energy resources and act as single conventional power plant in electricity market. As core management system VPP, should be dispatched optimally achieving maximum profit. Th...

The February 2021 Texas winter power outage has led to hundreds of deaths and billions dollars in economic losses, largely due the generation failure record-breaking electric demand. In this paper, we study scaling-up demand flexibility as a means avoid load shedding during such an extreme weather event. three mechanisms considered are interruptible load, residential rationing, incentive-based ...

Hierarchical reinforcement learning techniques operate on structured plans. Although structured representations add expressive power to Markov Decision Processes (MDPs), current approaches impose constraints that force the associated convergence proofs to depend upon a subroutinestyle execution model that restricts adaptive response. We develop an alternate approach to convergent learning that ...