Safety Integrity Level (SIL), as defined in ANSI/ISA S84.00.01 (IEC 61511-mod), is a widely used safety performance measure for safety instrumented functions. The standard ISA S84.00.01 suggests several methods for SIL determination, ranging from fully quantitative methods to fully qualitative methods. The large number of safety functions to evaluate during plant design and the need to integrat...

The performance analysis of a general production–inventory control system under uncertain demand is presented. In the model, the production order releases are determined based on the information feedback on the forecasted demand, work-in-process discrepancy and inventory discrepancy. Stability conditions are obtained in terms of the control parameters that manage the rate at which the above dis...

Safety critical Systems often integrate multiple complex functions and must generally ensure safety. These requirements lead to a need for simulation system that provides a prototype system for evaluation. This article proposes an agent-based simulation framework to meet the challenges of designing and evaluating the performance of the safety critical system. The approach proposed represents ea...

introduction: global patient safety is the concern of all areas of the health care. in addition to the human suffering in those inflicted unsafe care and services, it has a heavy economic cost. due to the sensitive patient safety in the operation rooms, the present study aimed to assess patient safety in the operating rooms. methods: this was a descriptive cross-sectional study that was conduct...

objective: the purpose of this study is to compare the executive functions children and adolescents who suffer from attention deficit hyperactivity disorder (adhd) with normal children. method: twenty children with adhd were compared to 19 healthy children terms of some executive functions using the computerized version of tower london, continuous performance test (cpt), and stroop color test. ...

We address the safety-critical control problem for systems whose dynamics evolve on manifolds using the concepts of control Lyapunov functions (CLFs) and control Barrier functions (CBFs). We first extend the concepts of CLFs and CBFs from Cartesian spaces to manifolds, resulting in geometric CLFs and CBFs. We then formulate a state-dependent online quadratic program (QP) that imposes the constr...