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Ã-UNIFORM STABILITY FOR LINEAR IMPULSIVE DIFFERENTIAL EQUATIONS
Yinhua Cui,Sung Sook Kim,Yoon Hoe Goo 충청수학회 2014 충청수학회지 Vol.27 No.3
In this paper, we show the Ã-uniform stability for lin-ear impulsive di??erential equations and their perturbations by using the impulsive Gronwall s inequalities.
BOUNDEDNESS IN DYNAMIC EQUATIONS ON TIME SCALES
Cui, Yinhua Chungcheong Mathematical Society 2013 충청수학회지 Vol.26 No.4
We study boundedness of solutions of dynamic equations on time scales by using Lyapunov-type functions.
Impulsive Stabilization of Dynamic Equations on Time Scales
Cui, Yinhua,Choi, Sung Kyu,Koo, Namjip Hindawi Limited 2014 Abstract and applied analysis Vol.2014 No.-
<P>In this paper we study the impulsive stabilization of dynamic equations on time scales via the Lyapunov’s direct method. Our results show that dynamic equations on time scales may beψ-exponentially stabilized by impulses. Furthermore, we give some examples to illustrate our results.</P>
MODULE LEFT (m, n)-DERIVATIONS
Yinhua Cui,신동윤 한국수학교육학회 2017 純粹 및 應用數學 Vol.24 No.1
Fo·sner [1] defined a module left (m; n)-derivation and proved the Hyers- Ulam stability of module left (m; n)-derivations. In this note, we prove that every module left (m; n)-derivation is trival if the algebra is unital and m 6= n.
Interface modification in solar cell contact electrode using pre-cleaning treatment chemistries.
Cui, Yinhua,Kim, Areum,Lee, Seonjea,Choi, Eunmi,Yoon, Sung Pil,Pyo, Sung Gyu American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.12
<P>Promoting and employing photovoltaic power as an alternative energy source, the solar cell industry has made rapid strides. However, improving the efficiency of these solar cells using low-cost fabrication processes is still needed. The interface between the Si surface and the electrode plays a very important role in the process of electrode formation of the solar cell. In this study, the electrode interface underwent four different pre-treatments in order to enhance the efficiency of Si-based solar cells. We analyzed the adhesion properties at the interface between the Si wafer and the electrode and conducted an analysis of the variation in contact resistance between the two contact surfaces. To reduce the cost of the entire experiment, we replaced the existing Ag screen printing-based electrode fabrication method with a low-temperature, low-cost Ni/Cu electroless plating method. The test cells exhibited improved adhesion and therefore improved efficiency as compared to cells treated with the currently used diluted HF.</P>
Yinhua Cui,최은미,Areum Kim,Leeseul Oh,Seon Jea Lee,Ayeon Ryang,박한수,임경희,표성규 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.4
Prior to electroless plating of the solar cell electrode, the sample was cleaned with a mixture of a sulfuric acid and peroxide solution and a H2NCH2CH2CH2Si(OC2H5) solution. We measured the de-wetting and contact angles of the solar cell thin film electrode. After SPM and APTES treatments, an excellent hydrophilic contact angle was observed. Our results show that it is more effective to remove oxidizer with SiO2 than HF mixed solutions. When comparing the efficiency, pre-treatment with a NH4F:HF mixed solution was more efficient than pre-treatment with a diluted HF solution. After NH4F:HF mixed solution cleaning, when the electrode was formed, the contact resistance that most directly affected the cleaning effect was 0.8194 ohm/sq, which had three times more improvement effect. It is expected that if an optimum cleaning time and process conditions for each cleaning chemical is developed, more improved contact resistance will be secured when each cleaning chemical is applied.
ψ-UNIFORM STABILITY FOR LINEAR IMPULSIVE DIFFERENTIAL EQUATIONS
Yinhua Cui,김성숙,구윤회 충청수학회 2014 충청수학회지 Vol.27 No.3
In this paper, we show the ψ-uniform stability for lin-ear impulsive differential equations and their perturbations by usingthe impulsive Gronwall's inequalities.
QUADRATIC ρ-FUNCTIONAL INEQUALITIES IN NON-ARCHIMEDEAN NORMED SPACES
Yinhua Cui,현윤탁,윤성식 한국수학교육학회 2017 純粹 및 應用數學 Vol.24 No.2
in this paper, we solve the following quadratic rho-functional inequalities \begin{eqnarray} \left\| f\left(\frac{x+y+z}{2}\right)+f\left(\frac{x-y-z}{2}\right)+f\left(\frac{y-x-z}{2}\right)+f\left(\frac{z-x-y}{2}\right) -f(x) -f(y) -f(z) \right\| \leq \| \rho (f(x+y+z) + f(x-y-z) +f(y-x-z)+f(z-x-y) -4f(x)-4f(y)-4f(z)\|, \end{eqnarray} and \begin{eqnarray} \| f(x+y+z) + f(x-y-z)+f(y-x-z)+f(z-x-y) -4f(x)-4f(y) -4f(z) \| \leq \left \| \rho \left( f\left(\frac{x+y+z}{2}\right)+f\left(\frac{x-y-z}{2}\right) +f\left(\frac{y-x-z}{2}\right)+f\left(\frac{z-x-y}{2}\right)-f(x)-f(y)-f(z) \right) \right\|,\end{eqnarray} where rho is a fixed non-Archimedean number with |rho| < |8|. Using the direct method, we prove the Hyers-Ulam stability of the quadratic rho-functional inequalities (0.1) and (0.2) in non-Archimedean Banach spaces and prove the Hyers-Ulam stability of quadratic ρ-functional equations associated with the quadratic rho-functional inequalities (0.1) and (0.2) in non-Archimedean Banach spaces.
ψ-UNIFORM STABILITY FOR LINEAR IMPULSIVE DIFFERENTIAL EQUATIONS
Cui, Yinhua,Kim, Sung Sook,Goo, Yoon Hoe Chungcheong Mathematical Society 2014 충청수학회지 Vol.27 No.3
In this paper, we show the ${\psi}$-uniform stability for linear impulsive differential equations and their perturbations by using the impulsive Gronwall's inequalities.