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synchronization of chaotic Lur'e systems with delayed feedback control using deadzone nonlinearity

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Chinese Physics B 2011年第1期20卷 209-214页

作者： s.m.lee O.m.Kwon Ju H.Park Department of Electronic Engineering Daegu UniversityGyungsan 712-714Republic of Korea school of Electrical Engineering Chungbuk National University410 SungBong-RoHeungduk-guCheongju 361-763Republic of Korea Department of Electrical Engineering Yeungnam University214-1 Dae-DongKyongsan 712-749Republic of Korea

In this paper we present a synchronization method for chaotic Lur＇e systems by constructing a new piecewise Lyapunov function. Using a delayed feedback control scheme, a delay-dependent stability criterion is derived for the synchronization of chaotic systems that are represented by Lur＇e systems with deadzone nonlinearity. Based on the Lyapunov-Krasovskii functional and by using some properties of the nonlinearity, a new delay-dependent stabilization condition for synchronization is obtained via linear matrix inequality （LmI） formulation. The criterion is less conservative than existing ones, and it will be verified through a numerical example.

关键词： Lur'e systems synchronization deadzone linear matrix inequality

A new approach to stability analysis of neural networks with time-varying delay via novel Lyapunov-Krasovskii functional

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Chinese Physics B 2010年第5期19卷 115-120页

作者： s.m.lee O.m.Kwon Ju H.Park Department of Electronic Engineering Daegu UniversityGyungsanGyungbuk 712-714Republic of Korea College of Electrical and Computer Engineering 410 SungBong-RoHeungduk-GuChungbuk National UniversityCheongju 361-763Republic of Korea Nonlinear Dynamics Group Department of Electrical EngineeringYeungnam University214-1 Dae-DongKyongsan 712-749Republic of Korea

In this paper, new delay-dependent stability criteria for asymptotic stability of neural networks with time-varying delays are derived. The stability conditions are represented in terms of linear matrix inequalities （LmIs） by constructing new Lyapunov-Krasovskii functional. The proposed functional has an augmented quadratic form with states as well as the nonlinear function to consider the sector and the slope constraints. The less conservativeness of the proposed stability criteria can be guaranteed by using convex properties of the nonlinear function which satisfies the sector and slope bound. Numerical examples are presented to show the effectiveness of the proposed method.

关键词： neural networks Lyapunov-Krasovskii functional sector bound time-delay

Activated sericite:An Efficient and Effective Natural Clay material for Attenuation of Cesium from Aquatic Environment

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Pedosphere 2014年第6期24卷 731-742页

作者： D.TIWARI LALHmUNsIAmA s.I.CHOI s.m.lee Department of Chemistry School of Physical SciencesMizoram University Department of Health and Environment Kwandong University Department of Environmental Engineering Kwangwoon University

sericite is mica-based natural clay that is annealed at 800 ℃ for 4 h, followed by acid activation using 3.0 mol L-1HCl at 100℃. The interaction of cesium(I), Cs(I), with sericite could provide useful data for the study of soil erosion or mass water movement utilizing the natural radioactive Cs. In this study sericite and activated sericite were used to assess their suitability in the attenuation of Cs from the aquatic environment under both batch and column experiments. The surface morphological studies indicated that a disordered and heterogeneous surface structure was exhibited by the activated sericite, whereas the native sericite exhibited a compact and layered structure. The Brunauer-Emmett-Teller(BET) specific surface area results indicated a significant increase in the surface area due to the activation of sericite. The batch reactor data collected for various parametric studies revealed that an increase in p H(from 2.0 to 8.0) and sorbate concentration(from 10.0 to 100.0 mg L-1) apparently favored the attenuation of Cs(I). The timedependent sorption data revealed that Cs(I) uptake was very rapid, and it achieved its saturation value within just 50 min of *** kinetic modeling studies indicated that the uptake of Cs(I) followed a pseudo-second-order rate equation; hence, the attenuation capacity of these solids for Cs(I) was estimated to be 0.858 and 4.353 mg g-1for sericite and activated sericite solids, *** adsorption isotherm modeling data showed a reasonably good applicability of the Freundlich model than the Langmuir *** effect of background electrolyte concentrations(0.001 to 0.1 mol L-1) of mg(NO3)2indicated that the presence of this electrolyte could not significantly affect the percent removal of Cs(I) by activated sericite. Furthermore, the fixed-bed column reactor operations were performed to obtain the breakthrough data, which were fitted well to the Thomas non-linear equation. Therefore, the loading capacity of Cs(I) wa

关键词： adsorption isotherms breakthrough data electrolyte kinetics radionuclide

Effect of Injection Velocity on structure Part Characteristic in AZ50 Die Casting Process with High Vacuum system

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Journal of materials science & Technology 2008年第1期24卷 75-79页

作者： s.m.lee P.K.seo C.G.Kang Korea school of mechanical Engineering Pusan National University Busan 609-735

When diecasting large and thin mg alloy parts,material defects occur,which include porosity,nonuniform mechanical properties,irregular surfaces,and incomplete *** resolve these problems,it is necessary to have uniform injection velocities and temperatures as well as control the *** study investigated the feasibility of producing large and thin components using a die caster by attaching a high vacuum *** particular,the effects of injection velocity on surface quality and the mechanical properties of the products were ***,an injection velocity scheme and a die structure capable of casting in a vacuum were *** a result,it was found that the critical low injection velocity was 0.2 m/s to produce large thin mg alloy structures having good mechanical properties.

关键词： mg die casting Injection velocity Vacuum system

Further results on stability criteria for T-s fuzzy systems with time-varying delay 36

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Further results on stability criteria for T-S fuzzy systems ...

Leader-following consensus criteria for multi-agent systems with time-varying delays and switching interconnection topologies

第36届中国控制会议

作者： Yajuan Liu Ju H.Park s.m.lee Department of Electrical Engineering Yeungnam University Department of Electronic Engineering Kyungpook National University

ISBN: (纸本)9781538629185

This paper studies the problem of stability for Takagi-sugeno（T-s） fuzzy systems with time varying *** employing a new augmented Lyapunov-Krasovskii function,using the second-order Bessel-Legendre inequality and combining with reciprocally convex approach,some less conservative delay-dependent stability criteria are derived within the framework of linear matrix inequalities（LmIs）.Two numerical examples are proposed to illustrate the effectiveness and the improvement of the proposed method.

关键词： T-s fuzzy systems Time varying delay Inequality inequality Lyapunov method

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Chinese Physics B 2012年第11期21卷 144-153页

作者： m.J.Park O.m.Kwon Ju H.Park s.m.lee E.J.Cha school of Electrical Engineering Chungbuk National University Department of Electrical Engineering Yeungnam University school of Electronic Engineering Daegu University Department of Biomedical Engineering School of MedicineChungbuk National University

We consider multi-agent systems with time-varying delays and switching interconnection topologies. By con- structing a suitable Lyapunov-Krasovskii functional and using the reciprocally convex approach, new delay-dependent consensus criteria for the systems are established in terms of linear matrix inequalities （LmIs）, which can be easily solved by using various effective optimization algorithms. Two numerical examples are given to illustrate the effectiveness of the proposed methods.

关键词： consensus multi-agent systems time delay Lyapunov method

synchronization criteria for coupled Hopfield neural networks with time-varying delays

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Chinese Physics B 2011年第11期20卷 140-150页

This paper proposes new delay-dependent synchronization criteria for coupled Hopfield neural networks with time-varying delays. By construction of a suitable Lyapunov Krasovskii＇s functional and use of Finsler＇s lemma, novel synchronization criteria for the networks are established in terms of linear matrix inequalities （LmIs） which can be easily solved by various effective optimization algorithms. Two numerical examples are given to illustrate the effectiveness of the proposed methods.

关键词： Hopfield neural networks coupling delay synchronization Lyapunov method

Fission-Like and Reaction Time in 8.5 meV/u ^(84)Kr+^(27)A1 Reaction

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Chinese Physics Letters 1998年第2期15卷 95-97页

作者： JIANG Dong-Xing LIU Xin s.m.lee Department of Technical Physics Peking UniversityBeijing 100871 Institute of Physics University of TsukubaIbaraki 305Japan

Reaction time of the deeply inelastic reaction in 8.5meV/u ^(84)Kr+^(27)A1 was estimated to be 8×10^(-21)s by extracting pre-scissionαand proton multiplicities and by statistical model(PACE4)*** using this reaction time value,the diffusion model calculations for the charge number distribution of fragments nicely explained the experimental results for the reactions at three incident energies 5.8,8.5 and 10.6meV/*** is indicated that a considerable fission-like component has contributed to the symmetric splitting fragments in the reactions,especially at 8.5 and 10.6 meV/u.

关键词： meV/u splitting extracting

Effect of si Content on mechanical Properties of a mo and V Free Low Alloy Cast steel for Automobile Cold Pressing Die

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Journal of materials science & Technology 2008年第3期24卷 313-316页

作者： B.H.Kim J.s.shin s.m.lee B.m.moon H.D.Kim s.Y.Ju O.Y.Choi Advanced materials R＆D Division Korea Institute of Industrial Technology Incheon 406-840 Korea Tooling Center GM Daewoo Auto ＆ Technology Co. Incheon 403-714 Korea

The effects of si content on combinations of important properties such as hardness, hardenability, and weldability in addition to strength increment were systematically investigated to develop a mo and V free low alloy cast steel for automobile cold pressing die insert. For the evaluation of the applicability as the die insert, the mechanical properties were measured after spheroidization annealing （sA）, quenching and tempering （Q/T）, and flame hardening （FH） treatments, respectively. The developed 0.8%-1.6%si containing mo and V free alloy cast steels showed excellent matrix strengthening effect, hardenability, and weldability, fulfilling the industrial criterion of the mechanical properties for the die insert.

关键词： Low alloy cast steel Cold pressing die Die insert matrix hardening Flame hardening