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Seyed Hossein Hosseini,Amir Farakhor,Saeideh Khadem Haghighian 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In this paper a new method of maximum power point tracking (MPPT) strategy based on Newton-Raphson algorithm is presented for photovoltaic (PV) power systems, which makes a high efficiency for PV power systems. In this approach variable step Newton-Raphson algorithm is applied to improve the dynamic response of PV array MPPT which is based on improved perturb and observe (IP&O) algorithm. Improved perturb and observe (IP&O) MPPT algorithm and model predictive control (MPC) are developed to control the output current of a boost converter in order to extract maximum solar power from the panel. MPPT tracker compels the system to operate at maximum power point through appropriate control of boost DC/DC converter. In the final stage a simple model predictive current control strategy is employed for two-level three-phase inverter to deliver power to a load. Descriptions of the proposed system along with detailed simulation results which verify its feasibility are given using MATLAB/Simulink software.
Mirzaie Zahra,Bastani Ali,Haji-Aghamohammadi Ali Akbar,Rashidi Nooshabadi Mohammadreza,Ahadinezhad Bahman,Khadem Haghighian Hossein 한국임상영양학회 2022 Clinical Nutrition Research Vol.11 No.2
Irritable bowel syndrome (IBS) is a common disorder that affects the large intestine. Oxidative stress and inflammation play a major role in IBS. Considering the antioxidant properties of ellagic acid (EA), this study was designed to evaluate the effect of EA on oxidative stress index, inflammatory markers, and quality of life in patients with IBS. This research was conducted as a randomized, double-blind, placebo-controlled clinical trial; 44 patients with IBS were recruited. Patients who met the inclusion criteria were randomly allocated to consume a capsule containing 180 mg of EA per day (n = 22) or a placebo (n = 22) for 8 weeks. Serum levels of total antioxidant capacity (TAC), malondialdehyde (MDA), C-reactive protein (CRP), and interleukin-6 (IL-6) were measured at the beginning and the end of the study. Also, quality of life was assessed using a self-report questionnaire for IBS patients (IBS-QOL). At the end of the study, we saw a significant decrease and increase in the MDA and TAC in the intervention group, respectively (p < 0.05). Also, EA consumption reduced CRP and IL-6 levels, and these changes were significant in comparison with placebo group changes (p < 0.05). The overall score of IBS-QOL significantly decreased, and quality of life was increased (p < 0.05), but there were no significant changes in the placebo group. According to these findings, receiving polyphenols, such as EA, may help maintain intestinal health by modulating inflammation and oxidative stress and ultimately improving the quality of life in IBS patients.