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- 저자 : FOUMANI (검색결과 5 건)
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MULTI-OBJECTIVE GEOMETRICAL OPTIMIZATIONOF FULL TOROIDAL CVT
M. SAADAT FOUMANI,M. DELKHOSH 한국자동차공학회 2013 International journal of automotive technology Vol.14 No.5
The objective of this research is geometrical and kinematical optimization of full-toroidal continuously variabletransmission (CVT) in order to achieve high power transmission efficiency and low mass. At first, a dynamic analysis isperformed for the system. A computer model is developed to simulate elastohydrodynamic (EHL) contact between disks androller and consequently, calculate CVT efficiency. The validity of EHL model is investigated by comparing output of thismodel and experimental data. Geometrical parameters are obtained by means of Particle Swarm Optimization algorithm, whilethe optimization objective is to maximize CVT efficiency and minimize its mass. The algorithm is run for different values ofselected input parameters that are oil temperature, roller tilting angle (speed ratio). Optimization results show that optimizedgeometrical parameters are approximately constant for various values of input parameters. Also, it is observed that, increasingvalues of oil temperature and roller tilting angle (in clockwise direction), will decrease power transmission efficiency. Anaverage power transmission efficiency of 86.7% is achieved over a wide range of input parameters, using optimized geometry.
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Waist Circumference and Spirometric Measurements in Chronic Obstructive Pulmonary Disease
Ali Alavi Foumani,Alireza Jafari,Zahra Abbasi Ranjbar,Ehsan Kazemnezhad Leyli,Shima Ildari,Mohammad Masoud Neyaragh 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.4
Objectives: The aim of this study was to evaluate whether the waist circumference of patients with chronic obstructive pulmonary disease (COPD), had an impact on lung function. Methods: There were 180 patients with COPD recruited into this prospective cross-sectional study. The age, weight, body mass index and waist circumference (WC) were measured. Spirometry parameters including forced vital capacity (FVC), and forced expiratory volume in the first second (FEV1), were measured and FEV1/FVC calculated. Results: The mean FEV1/FVC in both normal weight and overweight patients, did not statistically significantly correlate with WC. The COPD assessment test, positively correlated with WC (p = 0.031). A positive correlation with body mass index (p < 0.001), smoking (p = 0.027), and global initiative for chronic obstructive lung disease score (p = 0.009), were observed to positively associate with WC. WC, age, C-reactive protein, duration of disease, and gender (male), were observed to be statistically significant risk factors for the severity of COPD. Conclusion: WC was not observed to impact upon lung function in this study but it was a predictive factor for COPD severity in patients.
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OPTIMIZED FUZZY CONTROL STRATEGY FOR A SPA HYBRID TRUCK
A. TAGHAVIPOUR,M. S. FOUMANI 한국자동차공학회 2012 International journal of automotive technology Vol.13 No.5
In this paper, an optimized control strategy is proposed for a split parallel hydraulic hybrid truck. The model of the vehicle was simulated in Simulink. According to a global optimization technique, a fuzzy control strategy is developed or the vehicle. This strategy shows flexibility for different drive cycles and a desirable fuel consumption reduction, especially for a low speed drive cycle, which is extracted according to an urban utility vehicle mission.
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Masoud Yazdani,Hassan Salarieh,Mahmoud Saadat Foumani 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.6
Animal walking is one of the most robust and adaptive locomotion mechanisms in the nature, involves sophisticated interactions between neural and biomechanical levels. It has been suggested that the coordination of this process is done in a hierarchy of levels. The lower layer contains autonomous interactions between muscles and spinal cord and the higher layer (e.g. the brain cortex) interferes when needed. Inspiringly, in this study we present a hierarchical control architecture with a state of the art intrinsic online learning mechanism for a dynamicallywalking 5-link biped robot with compliant knee joints. As the biological counterpart, the system is controlled by independent control units for each joint at the lower layer. In order to stabilize the system, these units are driven by a sensory feedback from the posture of the robot. A central stabilizing controller at the upper layer arises in case of failing the units to stabilize the system. Consequently, the units adapt themselves by including online learning mechanism. We show that using this architecture, a highly unstable system can be stabilized with identicalsimple controller units even though they do not have any feedback from all other units of the robot. Moreover, this architecture may help to better understand the complex motor tasks in human.
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Kumaş Ali,Warenburg Milly van de,Natroshvili Tinatin,Kemler Marius,Foumani Mahyar 대한성형외과학회 2023 Archives of Plastic Surgery Vol.50 No.4
Background Carpal tunnel syndrome can be treated with corticosteroid injections (CIs) and surgery. In this systematic review, the influence of previous CI on different postoperative outcomes after carpal tunnel release is evaluated. Methods A systematic literature search using several databases was performed to include studies that examined patients diagnosed with carpal tunnel syndrome who received preoperative or intraoperative CIs. Results Of 2,459 articles, 9 were eligible for inclusion. Four papers reported outcomes of preoperative and four outcomes of intraoperative CIs. One study evaluated patients who received both intraoperative and preoperative corticosteroids. Conclusion Intraoperative CIs are associated with reduced postoperative pain after carpal tunnel release and support earlier recovery of the hand function that can be objectified in a faster median nerve conduction speed recovery and lower Boston Carpal Tunnel Questionnaire (BCTQ) scores. Using preoperative CIs did not lead to enhanced recovery after carpal tunnel release, and both preoperative and intraoperative CIs might be predisposing factors for infections.
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