• Journal of applied mathematics & informatics
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• 제36권5_6호
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• pp.419-428
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• 2018

Let us think of adding each digit of a natural number, in bases b, that are e-powered. By studying for a number becoming greater than or equal to oneself, we will consider values of ${\lim}_{b{\rightarrow}{\infty}}{\frac{N(e,b)}{b^e}}$.

• 대한수학회논문집
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• 제33권4호
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• pp.1123-1123
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• 2018

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 총회 및 춘계학술발표회
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• pp.364-367
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• 2003

In this paper, we have examined the MTBE cometabolic degradation by pure culture, which is isolated gasoline contaminated aquifer. Propane was more effectively utilized as a growth substrate to oxidize MTBE. Specific substrate degradation rate was Increased with increasing initial propane amount. Respiking propane was enhanced and continued MTBE degradation and TBA observation was supported MTBE degradation. The mass balance of MTBE and TBA indicated that MTBE was oxidized to TBA as well as further oxidation of TBA.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2012년도 추계총회 및 학술대회 논문집
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• pp.95-95
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• 2012

In this study, the effect of $PO{_4}^{3-}$ ions on formation of PEO(Plasma Electrolytic Oxidation) films was investigated in aqueous solution. A minimum concentration of $PO{_4}^{3-}$ ions was necessary for the formation of PEO film on pure Mg and arcing voltage of pure Mg decreased with increasing $PO{_4}^{3-}$ ion concentration. Immersion test to evaluate the corrosion resistance of PEO-treated pure Mg and Mg alloys were conducted in 0.5M NaCl solution.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제25권4호
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• pp.253-265
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• 2018

In this paper, we introduce the concept of Fibonacci sequences on MV-algebras and study them accurately. Also, by introducing the concepts of periodic sequences and power-associative MV-algebras, other properties are also obtained. The relation between MV-algebras and Fibonacci sequences is investigated.

• 한국수학교육학회지시리즈B:순수및응용수학
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• 제28권1호
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• pp.1-13
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• 2021

In this note we use a generalization of coincidence point(a property which was defined by [1] in symmetric spaces) to prove common fixed point theorem on S-metric spaces for weakly compatible maps. Also the results are used to achieve the solution of an integral equation and the bounded solution of a functional equation in dynamic programming.

• 대한수학회보
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• 제59권5호
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• pp.1289-1304
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• 2022

In this note, we show that a strongly 𝜙-ring R is a 𝜙-PvMR if and only if any 𝜙-torsion-free R-module is 𝜙-w-flat, if and only if any GV-torsion-free divisible R-module is nonnil-absolutely w-pure, if and only if any GV-torsion-free h-divisible R-module is nonnil-absolutely w-pure, if and only if any finitely generated nonnil ideal of R is w-projective.

• 대한수학회논문집
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• 제38권2호
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• pp.575-588
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• 2023

In the present paper, we consider a kind of generalized hyperbolic geometric flow which has a gradient form. Firstly, we establish the existence and uniqueness for the solution of this flow on an n-dimensional closed Riemannian manifold. Then, we give the evolution of some geometric structures of the manifold along this flow.

• Journal of Applied and Pure Mathematics
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• 제4권1_2호
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• pp.63-69
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• 2022

This article is the result of calculating the convolution of Ramanujan's sum and natural number multiplied. Among these results, special values are expressed by Euler and Bernoulli functions.

• Journal of applied mathematics & informatics
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• 제42권1호
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• pp.85-92
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• 2024

In this work we give the necessary and sufficient conditions for f-biharmonic curves in three-dimensional generalized symmetric spaces.