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Analog Filter Circuits Feature Selection Using MRMR and SVM
Yongkui Sun,Lei Ma,Na Qin,Meilan Zhang,Qianyong Lv 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This paper addresses frequency response feature extraction of analog filter circuits. An approach for feature selection using criteria of maximum relevance minimum redundancy (MRMR) and support vector machine (SVM) is proposed. Key idea of the method is to obtain candidate feature subsets with descending order using criteria of MRMR first, and then to select the optimal feature subset through cross validation results of each feature subset using SVM. Experimental results testify that the proposed approach has the advantages of less time-consuming and the selected features have reasonable distribution.
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Yongkui Yang,Yifeng Ling,Longfei Wang,Peizhe Sun,Lin Zhao,Hongyang Wang 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.5
With rapid industrialization and population growth, sewage sludge generation has increased worldwide, and it needs to be treated properly. The pyrolysis of sewage sludge into biochar provides sustainable benefits for concomitant pollutant adsorption and waste treatment. Sulfamethoxazole (SMX) antibiotics are highly prevalent in waste-water owing to their widespread utilization and low metabolic rate and removal efficiency during conventional waste-water treatment. Biochar is known to effectively remove pollutants from wastewater. However, the adsorption capacity and mechanism of SMX adsorption onto sludge-based biochar are currently unclear. Therefore, the adsorption behavior of SMX on sludge-based biochar from three sources (raw sludge, compost sludge, and digested sludge) and ZnCl2-modified biochar was investigated. Among the unmodified biochars, raw sludge-based biochar exhibited the highest adsorption capacity, followed by compost sludge-based and digested sludge-based biochar. The pore-forming effect of ZnCl2 application significantly increased the biochar specific surface area, which increased the equilibrium adsorption of SMX from 6.1 mg/g to 49.3 mg/g. The adsorption mechanisms involved electrostatic interactions, pore filling, hydrophobic interactions, hydrogen bonding, and π-π interactions. The findings of this study demonstrate the development of sewage sludge biochar and its effectiveness for the treatment of antibiotics containing wastewater.
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Mohamed Ahmed Eshag,Lei Ma,Yongkui Sun,Kai Zhang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.2
In this paper the vibration control problem is addressed for the Euler-Bernoulli beam with system parameters uncertainties, spatiotemporally-varying disturbance, and boundary disturbance. By using global sliding-mode boundary control (GSMBC) through method of lines (MOL), a robust boundary control design is suggested to diminish the perturbations of uncertain Euler-Bernoulli beam and to compensate the influence of the spatiotemporally varying disturbance and boundary disturbance. Dynamics of the Euler-Bernoulli beam are described by nonhomogenous hyperbolic partial differential equation (PDE) and ordinary differential equations (ODEs). MOL is employed to acquire the beam dynamics represented by ODE system in lieu of PDE system, therefore a precise solution is obtained by solving the resulting ODE system. Then, GSMBC is established for mitigating the vibrations of the beam affected by system parameters uncertainties, spatiotemporally-varying disturbance, and boundary disturbance. Chattering phenomena is avoided by using exponential reaching law supported by a relay function. Exponential convergence and stability robustness of the closed-loop system are assured by Lyapunov direct approach. In the end, simulation outcomes show that the GSMBC-based MOL scheme is valid for vanishing the vibrations of the uncertain Euler-Bernoulli beam efficiently.
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