• 복식
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• 제67권3호
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• pp.47-65
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• 2017

The purpose of this study was to divide respondents by consumption values, and to examine the differences in their cosmetic purchase behavior. Cosmetic purchase behavior consisted of variables such as purchase frequency, purchase amount, place of purchase, purchase reason, reason for using cosmetics, purchase propensity, degree of using information source, and selection criteria. A survey was conducted with 308 women between the ages 20 and 29 from December 5th to 10th 2016. Data collected from the respondents through an Internet survey were analyzed using descriptive statistics, factor analyses, cluster analysis, analyses of variance and chi-square tests. Four consumption value dimensions emerged that were termed emotional, differentiated individuality-pursuing, functional and social value. The respondents were classified into three groups(emotional consumer group, functional consumer group, active consumer group) by cluster analysis using four dimensions of consumption value. The results of the analyses of variance and chi-square tests showed significant differences in purchase frequency, place of purchase, purchase reason, reason for using cosmetics, degree of using information source and selection criteria among groups classified by consumption value. However, there were no differences in purchase amount and purchase propensity among them.

• 한국환경과학회지
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• 제18권11호
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• pp.1207-1214
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• 2009

Functional properties of Solanium nigrum-ethanol extract were investigated, nitrite scavenging ability(NSA) and antioxidant activities based on thiobarbituric acid(TBA) value were measured. The contents of potassium in fruit and root, calcium in leaf were the highest mineral components in each parts of Solanium nigrum. Total aromatics contents(TAC) was order of fruit>root>leaf, total flavonoid contents(TFC) in leaf was 6 and 10 times, total phenolic compounds contents(TPC) in leaf was 15 and 30 times of those in fruit and root, respectively, and TFC was high with TPC increase. NSA of leaf-ethanol extract was 61.9% on pH 1.2, 53.5% on pH 3.0, 54.8% on pH 4.0 and 14.3% on pH 6.0, where as NSA of root and fruit-ethanol were considerably low to 3.5~7.9% over pH 1.2~6.0. TBA value of soybean oil with the dosage of leaf-extract showed few differences from control within 3 days, but it fairly decreased with considerable antioxidant effect to 47.6% of the control in 8 days.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2022년도 추계학술대회
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• pp.215-215
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• 2022

Starch synthase proteins (SSI, SSII and SSIII) in rice are mainly involved in amylopectin synthesis mediating its chain elongation, and the functional loss of SSII can increase amylose accumulation through decreasing of amylopectin chain proportions. For purposes of identifying functional haplotypes and evolutionary analyses of this gene, SSII-1, we investigated 374 rice accessions belonging to different subgroups of origins. We subsequently performed bioinformatic analyses on their variations through haplotyping, resequencing and structuring based on different classified populations. Haplotyping of cultivated rice accessions using genetic variations within SSII-1 genomic region of chromosome 10 revealed a total of 8 haplotypes, representing 6 functional haplotypes by 4 non-synonymous SNPs of three different exons (1, 4 and 10), which effect on protein structure. Higher nucleotide diversity value was found in wild group (0.0055) compared to any of cultivated subpopulations, of which aus showed the most reduction of diversity value (0.0003). Tajima's D analysis exhibits the most Tajima's D value only in admixture group (0.3600) which appears to be the cause of a sudden population contraction by rare alleles scarcity. A clear separation of some wild accessions from the admixed cultivated subpopulations was observed in PCA and phylogenetic analysis. Similar admixed pattern of population structure was estimated with an increased K values of 2 to 8 where genetic components of almost all cultivated subpopulations were shared with the wild which can also be subsequently estimated by very low F_ST-values by -0.011 (wild-aromatic) and -0.003 (wild-admixture).

• Journal of applied mathematics & informatics
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• 제9권2호
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• pp.635-643
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• 2002

The asymptotic behaviour of the solutions of initial - boundary value problem for a class of nonlinear parabolic differential - functional equations is studied via the method of differential inequalities in order to obtain oscillation criterion for the solutions.

• Bulletin of the Korean Chemical Society
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• 제29권6호
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• pp.1141-1148
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• 2008

Geometry optimizations and electronic structure calculations are reported for meso-tetraphenyl porphyrin (TPP) and a series of meso-substituted catecholic porphyrins (KP99150, KP99151, KP99152, KP99153, and KP99090) using density functional theory (DFT). The calculated B3LYP//RHF bond lengths are slightly longer than those of LSDA//RHF. The calculated electronic structures clearly show that TPP and meso-catecholic group contribute to π-electron conjugation along porphyrin ring for HOMO and LUMO, significantly reduced the HOMO-LUMO gap. The wavelength due to B3LYP energy gaps is favored with experimental value in Soret (B), and LSDA energy gaps are favored with experimental value in visible bands (Q). The electronic effect of the catecholic groups is to reduced energies of both the HOMOs and LUMOs. However, the distortion of porphyrin predominantly raises the energies of the HOMOs, so the net result is a large drop in HOMO and smaller drop in LUMO energies upon meso-substituted catecholic group of the porphyrin macrocycle as shown in KP99151 and KP99152 of Figure 5(a). These results are in reasonable agreement with normal-coordinate structural decomposition (NSD) results. The HOMO-LUMO gap is an important factor to consider in the development of photodynamic therapy (PDT).

• 대한수학회보
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• 제53권1호
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• pp.103-117
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• 2016

Abstract. In this paper, we study a modified stochastic predator-prey system with general ratio-dependent functional response. We prove that the system has a unique positive solution for given positive initial value. Then we investigate the persistence and extinction of this stochastic system. At the end, we give some numerical simulations, which support our theoretical conclusions well.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제11권1호
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• pp.85-93
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• 2007

In this paper we prove the existence of mild solutions of a first order impulsive initial value problems for functional differential equations in Banach spaces. The results are obtained by using the Lerey-Schauder nonlinear alternative fixed point theorem.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제17권1호
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• pp.17-28
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• 2013

In this paper, we study the global existence of solutions for the initial value problems for Volterra-Fredholm type functional impulsive integrodifferential equations. Using the Leray-Schauder Alternative, we derive conditions under which a solution exists globally.

• 디지털융복합연구
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• 제11권8호
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• pp.159-173
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• 2013

본 연구의 목적은 이론적 실증적 연구를 통해 유통업체 브랜드 가치가 브랜드 신뢰, 브랜드 태도, 브랜드 충성도에 미치는 영향관계를 파악하는데 있다. 특히 외생변수인 브랜드 가치를 감정적 가치, 사회적 가치, 기능적 가치 등으로 유형별로 구분하여 내생변수인 브랜드 신뢰, 브랜드 태도, 브랜드 충성도에 유의적인 영향관계가 있는지를 검증하였다, 그 결과, 사회적 가치를 제외하고 감정적 가치와 기능적 가치가 브랜드 신뢰에 유의적인 영향을 미치는 것으로 나타났다. 그리고 브랜드 태도에는 세 가지 유형의 브랜드 가치가 모두 긍정적인 영향을 미치는 것으로 나타났다. 브랜드 신뢰는 브랜드태도와 브랜드 충성도에 직접적으로 정(+)의 영향관계가 있을 뿐만 아니라, 브랜드 태도를 거쳐 간접적으로도 브랜드 충성도에 정의 영향을 미치는 것으로 나타났다. 마지막으로 브랜드 태도는 브랜드 충성도에 정(+)의 영향을 미치는 것으로 나타났다. 따라서 이러한 연구 결과를 토대로 브랜드 가치와 관련해서 마케팅 담당자들은 실무적으로 마케팅 전략 수립에 활용할 수 있을 것이다.

• 한국컴퓨터정보학회논문지
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• 제28권1호
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• pp.143-150
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• 2023

본 연구는 청소년의 스포츠제품 소비가치와 상향적 소비성향 및 구매후 행동과의 관계를 규명하는데 있다. 이를 통해 스포츠제품 기업이 청소년층을 대상으로 한 마케팅 전략에 효과적인 정보를 제공하고자 한다. 연구대상은 충청남북도 지역의 청소년들을 편의표본추출법으로 추출하였으며, 최종분석에는 257명의 자료가 사용되었다. 통계방법은 빈도분석, 상관관계분석, 회귀분석을 실시하였다. 그 결과, 첫째, 소비가치의 하위 요인인 사회적가치와 탐험적가치는 상향적 소비성향에 유의한 영향을 미치는 것으로 나타났으나, 기능적가치와 자아적가치는 통계적으로 유의하지 않은 것으로 나타났다. 둘째, 소비가치의 하위 요인인 사회적가치와 자아적가치, 기능적가치는 구매후 행복에 유의한 영향을 미쳤으나, 탐험적가치는 통계적으로 유의하지 않은 것으로 나타났다. 셋째, 상향적 비교성향은 구매후 행복에 유의한 영향을 미치는 것으로 나타났다.