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A Sliding Mode Observer Approach To Chaos Synchronization
Abdolkarim Daryabor,Hamid Reza Momeni 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In this paper, synchronization of the chaotic systems based on sliding mode observer is presented. This observer has a simple structure that contains a sliding mode term which turns out to be robust against output noises as well as sustained disturbance. Only one of the states of the master that satisfies the observability matching condition is sent to the slave system via a public channel, which is a sliding mode observer designed to reconstruct all of the states of the master system. For verification and demonstration, this approach is applied to the unified chaotic systems. Simulation results are proposed to demonstrate the effectiveness of this method.
Rahil Jannatifar,Hamid Piroozmanesh,Fahimeh Naghi Jalalabadi,Hamid Reza Momeni 대한해부학회 2023 Anatomy & Cell Biology Vol.56 No.4
Septin4 belong to a family of polymerizing GTP-binding proteins that are required for many cellular functions, such as membrane compartmentalization, vesicular trafficking, mitosis, and cytoskeletal remodeling. Since, Septin4 is expressed specifically in the testis, we aimed to determine the association between Septin4 gene expression with sperm quality, DNA damage, and stress oxidative level in infertile patients. The present study included 60 semen samples that grouped into three groups: normozoospermia (n=20), asthenozoospermia (n=20), astheno-teratozoospermia (n=20). Initially, semen parameters were analyzed by using the World Health Organization protocol. The mRNA expression of Septin4 in sperm was examined using reverse transcription-polymerase chain reaction. Oxidative stress markers, i.e., total antioxidant capacity, superoxide dismutase, catalase, glutathione peroxidase, and malondialdehyde, were determined by ELISA kit. The current study showed a statistically significant highly positive correlation in Septin4 gene expression with sperm motility, normal morphology, viability, capacity, and sperm mitochondrial membrane potential (MMP). However, it showed significant negative correlation with sperm DNA fragmentation. Septin4 had a significant correlation with stress oxidative factor and antioxidant enzyme levels. In conclusion, Septin4 gene expression provides clinical useful information for the diagnosis of male infertility. It might be a marker for discrimination between fertile and infertile patients. The current study showed a statistically significant highly positive correlation in Septin4 gene expression with sperm motility, normal morphology, viability, capacity, and sperm MMP. However, it shows significant negative correlation with sperm DNA fragmentation. Septin4 had a significant correlation with stress oxidative factor and antioxidant enzyme levels.
Fuzzy Surface-Based Control for Uncertain Unified Chaotic Systems
Sara Dadras,Hamid Reza Momeni,Vahid Johari Majd 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper proposes a fuzzy sliding mode control strategy for an uncertain unified chaotic system with input nonlinearity. Using the sliding mode control technique, a sliding surface is determined and the control law is established. A fuzzy system is used instead of sign function in the sliding mode control to reduce the chattering phenomenon on the sliding surface. Based on Lyapunov stability theory, stability of the fuzzy sliding control law is determined. Chattering in the system with nonlinearity input is also damped due to this control law. The illustrative simulation results are given to demonstrate the effectiveness of the proposed fuzzy sliding mode control design.
Control of Uncertain Butterfly-Shaped Chaotic System: Sliding-mode Approach
Sara Dadras,Hamid Reza Momeni,Vahid Johari Majd 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
A sliding mode control scheme for an uncertain Butterfly-shaped chaotic dynamical system is proposes in this paper. A sliding surface is determined according to the sliding mode control technique and the control law is established. Stability of the sliding control law is determined using Lyapunov stability theory. The chattering phenomenon, which deteriorates the system performance and may cause unforeseen instabilities, is attenuated due to this control law. The effectiveness of the presented sliding mode control design is confirmed through numerical simulations.
Robust Observer-based H_∞ Control of a Markovian Jump System with Different Delay and System Modes
Amir Hossein Abolmasoumi,Hamid Reza Momeni 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4
This paper investigates the problem of robust observer-based stabilization for a delayed Markovian jump system. The sources of randomness in the system mode and the delay mode are assumed to be different. To this end, two different Markov processes are considered for modeling the randomness of the system matrices and the state delay. A two mode-dependent Lyapunov-Krasovskii functional is used to design a robust observer based feedback control rule for the stochastic stability of the closed-loop system. The rule4 should also satisfy the condition of disturbance reduction at a prescribed level in the presence of parametric uncertainties. The procedure is implemented by solving linear matrix inequalities (LMIs). The results are tested within a simulation example and the effectiveness of the proposed design method is verified.
Adaptive Sliding Mode Control For Roll Motions Of Ships
Elham Amini Boroujeni,Hamid Reza Momeni 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper is concerned with the problem of adaptive sliding mode control for roll motions of ships as an uncertain nonlinear system with five equilibrium points which faces external disturbance .The purpose is designing a robust controller for this model with these properties, under the influence of external sinusoidal disturbances. The capabilities of the proposed controller are verified by the simulation results.
Designing Robust Pole Placement Control For Roll Motions Of Ships via LMIs
Elham Amini Boroujeni,Abdolkarim Daryabor,Hamid Reza Momeni 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper addresses the problem of robust pole placement control of nonlinear systems having multiple equilibrium points and low order dynamics (Roll Motion Of Ships) via a dynamic output feedback in which the controller has dynamic states. The design technique is described using linear matrix inequalities (LMIs).pole placement by using LMIs places the close loop poles in appropriate region to have the best response by considering a tradeoff between overshoot of the response, settling time and steady state error. The effectiveness of the proposed technique in control of Roll Motion of Ships is illustrated by simulation results.