• Journal of applied mathematics & informatics
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• 제27권3_4호
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• pp.865-873
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• 2009

Goodman([3]) presented the question of finding a best possible upper bound of the form $t(G)\;+\;t(G^c)$, where t(G) denote the number of triangles in given graph G. In this, the form of squares of degrees is appeared and many researches have been pursued as an application related to this. Here, we would like to deal with corollary related to the results of Nikiforov([6]).

• 한국세라믹학회지
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• 제27권6호
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• pp.769-776
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• 1990

This study deals with the refinement of Hwasun flint clay by grinding, classifying, magnetic separation and acid treatment in sequence. Results are as follows ; 1. Fine kaolinite particles of median size in the range of 4.8 and 1.7$\mu\textrm{m}$ was collected, with the yield of 87.4% by dry grinding and classifying process. 2. It is proven that the iron bearing are of Hwasun flint clay is mainly consisted of chloritoid and iron rich muscovite. 3. As the results of the high gradient magnetic separation, the bleaching and iron removal degree of the dry grinding and classifying sample was 4-58% and 5-62% respectively. 4. As the results of the acid treatment, bleaching and weight loss degree of the dry grinding and classifying sample was reduced to 16-82% and 6-29% respectively.

• 한국의류학회지
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• 제27권5호
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• pp.523-523
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• 2003

The change of interactions of anionic surfactants, sodium dodecyl sulfate(SDS) and sodium tetradecyl sulfate(575) in the presence of electrolytes, to the chitosan-based polyelectrolyte(sol＇n and gel phase) were studied. The chitosan gel used in this study were crosslinked with epichlorohydrin(ECH). Binding isotherms were determined by potentiometric technique using a surfactant ion selective solid-state electrode and the results were represented by using the sequence generating function(SGF) method. The results of binding isotherm were shown comparatively high cooperativity. The addition of electrolytes in the chitosan/SDS system resulted in a shift of the binding to higher free surfactant concentration because of screen effect by the electrolytes. Degree of binding of chitosan gel was higher than that of chitosan sol＇n. And also a conformational phase transition of the chitosan gel in the presence of electrolytes has been investigated.

• 한국의류학회지
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• 제27권5호
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• pp.524-532
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• 2003

The change of interactions of anionic surfactants, sodium dodecyl sulfate(SDS) and sodium tetradecyl sulfate(575) in the presence of electrolytes, to the chitosan-based polyelectrolyte(sol＇n and gel phase) were studied. The chitosan gel used in this study were crosslinked with epichlorohydrin(ECH). Binding isotherms were determined by potentiometric technique using a surfactant ion selective solid-state electrode and the results were represented by using the sequence generating function(SGF) method. The results of binding isotherm were shown comparatively high cooperativity. The addition of electrolytes in the chitosan/SDS system resulted in a shift of the binding to higher free surfactant concentration because of screen effect by the electrolytes. Degree of binding of chitosan gel was higher than that of chitosan sol＇n. And also a conformational phase transition of the chitosan gel in the presence of electrolytes has been investigated.

• Journal of information and communication convergence engineering
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• 제19권4호
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• pp.205-213
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• 2021

The properties of a scale-free network are little known; its node degree following a power-law distribution is among its few known properties. By selecting real-field scale-free networks from a network dataset and comparing them to other networks, such as random and non-scale-free networks, the topology characteristics of scale-free networks are identified. The assortative coefficient is identified as a key metric of a scale-free network. It is also identified that most scale-free networks have negative assortative coefficients. Traditional generation models of scale-free networks are evaluated based on the identified topology characteristics. Most representative models, such as BA and Holme&Kim, are not effective in generating real-field scale-free networks. A link-rewiring method is suggested that can control the assortative coefficient while preserving the node degree sequence. Our analysis reveals that it is possible to effectively reproduce the assortative coefficients of real-field scale-free networks through link-rewiring.

• Journal of applied mathematics & informatics
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• 제41권5호
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• pp.1057-1069
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• 2023

In this paper, we have determined the degree of approximation of function belonging of Lipschitz class by using Deferred-Generalized Nörlund (D^𝛾_𝛽.N_pq) means of Fourier series and conjugate series of Fourier series, where {p_n} and {q_n} is a non-increasing sequence. So that results of DEGER and BAYINDIR [23] become special cases of our results.

• 한국발생생물학회지:발생과생식
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• 제7권2호
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• pp.119-126
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• 2003

본 연구실에서는 이전의 실험에서 suppression subtractive hybridization(SSH)을 통하여 생쥐의 생후 1일자 난소와 5일자 난소에서 차이 나게 발현하는 유전자들의 목록을 얻었고 그 중에서 MT transposon-like element, clone MTi7(MTi7)이 성장하는 난포에서 더 높게 발현한다는 것을 알아냈다(Park et al., 2002). In situ hybridization과 RNA interference를 이용한 연구결과, MTi7은 난자에서 특이 적으로 발현하는 유전자로 특히 난자성숙에 관여하는 것으로 관찰되었다(Park et at., 2003). 그러나 현재까지 MTi7의 염기서열은 생쥐에서만 알려져 있다. 따라서 본 연구는 두 부분으로 나누어서 첫째, MTi7이 다른 포유류에도 존재하는지 알아보기 위해 소,돼지, 흰쥐 그리고 사람 등 각기 다른 네 종의 난소 cDNA를 사용하여 새로운 MTi7을 분리하고자 하였으며, 둘째, 생쥐의 MTi7이 transposon의 특징을 갖고 있어 다른 유전자에 삽입되어 있는지를 알아보기 위해 inverse PCR을 시행하여 MTi7주변의 유전자가 있는지를 조사하였다. 네 종의 난소 cDNA를 사용하여 생쥐의 MTi7과 매우 유사한 염기서열을 갖고 있음을 알았다(87%∼98%). Inverse PCR 결과, 생쥐의 MTi7은 beta-carotene 15, 15'-monooxygenase(Bcdo) 유전자 혹은 serine protease inhibitor, Kunitz type I(Spint 1) 유전자에 삽입되어 있음을 알 수 있었다. 본 연구의 결과로 여러 포유류의 MTi7 sequence를 알아내고, 또한 생쥐의 MTi7이 삽입되어 있는 유전자를 알아냄으로써 머지 않은 장래에 난자형성 및 난포형성과정에 있어서 MTi7의 역할을 밝혀 낼 수 있을 것으로 기대된다.

• 기술사
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• 제31권1호
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• pp.9-16
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• 1998

For the flow facing high1y informationized age, there is a flow from fixed communications connecting fixed places such as offices and homes to mobile communications connecting mobile objets such as automobiles, ships and aircraft. This flow has added to diversifying communications Including data and images. While the axed mode is diversifying information media by digitalization of communications network and computers, the mobile mode has brought higher sophistication of communication modes by a higher degree of electric wave utilization. The following descriptions outlines the mobile communication which is utilizing the electric wave phenomena. In sequence the following items are described: a brief history of mobile communications, the technical object and various kinds of services, propagation of electric wave signal.

• 대한수학회보
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• 제38권2호
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• pp.293-302
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• 2001

We improve the greedy algorithm which is one of the general convergence criterion for certain iterative sequence in a given space by building a constructive greedy algorithm on a normed linear space using an arithmetic average of elements. We also show the degree of approximation order is still $Ο(1\sqrt{\n}$) by a bounded linear functional defined on a bounded subset of a normed linear space which offers a good approximation method for neural networks.

• 통합자연과학논문집
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• 제4권3호
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• pp.227-228
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• 2011

Bae and Kim displayed a sequence of 4th degree self-reciprocal polynomials whose maximal zeros are related in a very nice and far from obvious way. The auxiliary polynomials in their results that parametrize their coefficients are of significant independent interest. In this note we show that such auxiliary polynomials are related to Chebyshev polynomials.