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Articles by Ehsan Mohammadi
Total Records ( 2 ) for Ehsan Mohammadi
  Morteza Montazeri- Gh , Shabnam Yazdani and Ehsan Mohammadi
  In power industries, the need for an appropriate model within the process of control system design along with the importance of condition monitoring and reducing maintenance costs, increase the demand for development of an accurate model capable of estimating engine dynamic behavior under different working conditions. In this study, an industrial two-shaft gas turbine is modeled and simulated in the Matlab-Simulink environment and a multi-loop controller is designed for it. For this purpose, first, a thermodynamic model of the engine capable of predicting its performance at full and part load conditions is presented. A fuel control system based on min-max control strategy is devised and its parameters are modified utilizing Invasive Weed Optimization algorithm as a powerful global optimization technique. The performance of suggested model in steady-state condition is validated against the data published by the manufacturer and the results obtained confirmed the reliability of the model and its capability in simulating the gas turbine’s actual behavior. In order to study the controller's ability in maintaining desired rotational speed of the power turbine shaft, sharp load variations are exerted to the model and the controller's functionality in wide load ranges is analyzed. According to the results, the proposed controller is capable of meeting the expectations.
  Ehsan Mohammadi , Yahya Zaebi , Seyedeh Hoda Mousavi , Mohammad Mahboubi , Mohsen Mohammadi , Alireza Zangeneh , Nasim Hatefi Moadab , Nemat-Allah Chaghazardi , Neda Izadi , Yones Mohammadi , Farzad Soleymani and Omolbanin Atashbahar
  Performance of the hospital’s emergency department can be evaluated by means of key quantitative and qualitative indicators. Important quantitative indicator, including percent of failed CPR, waiting time duration, percent of released emergency patients with personal responsibility, percent of released emergency patients in specific times, etc. Present study aims to survey emergency department’s performance by means of mentioned indicators during pre and post-health care reform. This was a descriptive and cross-sectional study, implemented during 2013 and 2014, pre and post-health care reform in the public hospitals of Kermanshah province. Data gathered by means of performance indicators in the emergency department were evaluated. Then indicators of these 2 periods were compared by means of the paired independent t-test while p<0.05 was considered to be at a significant level. Among measured indicators, failed CPR (p = 0.025) waiting time duration in level 4 triage (p = 0.012) emergency patient who were settled in 6 h (p = 0.00) patients who moved out of the department in 12 h (p = 0.00) decreased after the implement of health care reform in surveyed hospitals and other indicators didn’t change. Hospitals’ indicators including indicators of emergency department are the most important hospital performance indicators considering various fields. So comprehensive attention to these indicators is necessary because hospital indicators show clearly hospital performance and also hospital’s weaknesses and strengths which are explicit with more thought on these indicators. What’s more its performance has a direct impact on hospital activity, health network and health care system activities.
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