• 대한수학회보
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• 제45권1호
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• pp.23-31
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• 2008

In this paper, we investigate nonoscillatory solutions of a class of higher order neutral nonlinear difference equations with positive and negative coefficients $\Delta^m(x(n)+p(n)x(\tau(n)))+f_1(n,x(\sigma_1(n)))-f_2(n,x(\sigma_2(n)))=0,\;n{\geq}n_0$. Some sufficient conditions for the existence of nonoscillatory solutions are obtained.

• 아동학회지
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• 제26권2호
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• pp.193-207
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• 2005

The present research studied children's coping strategies by age, sex, and frequency of victimization and examined the relationship of coping strategies to loneliness in peer victimization. Participants were 434 children from the 3rd to 6th grades of an urban elementary school. Self-report data indicated seven types of coping strategies : cognitive distancing, adult support seeking, peer support seeking, negative problem solving, positive problem solving, internalizing, and externalizing. With increasing age, children used less adult support seeking and more positive problem solving. While girls used more adult and peer support seeking, boys employed more externalizing and negative problem solving. Children with higher victimization frequencies were more likely to use negative problem solving and internalization. Lack of strategies for seeking social support was associated with loneliness.

• 한국의류학회지
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• 제23권2호
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• pp.314-325
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• 1999

The purposes of this study were to classify the types of consumers' emotion experienced in-store by shopping motivation and to examined the effects of store environmental factors on emotion and on shopping behavior. The questionnaires were administered to 330 women shopped in department store. Data from 299 women were analyzed by using frequency t-test and regression analysis by SPSS for windows PC program The results of this study were as follows : 1. The consumers' emotion experienced in -store were composed of five factors. But it could be divided by positive negative factors. 2. There was not significant difference in positive emotion between he Product Pu-rchasing Motive Group and the Window Shopping Motive Group. But there was significant difference n negative emotion between two groups. 3. It was found that the effect of environmental factors of apparel store on emotion was significant in both groups. Especially salespeoples' pressure significantly influenced negative emotion in both groups. 4. The emotion experienced in -store significantly influenced clothing shopping behavior.

• Journal of Preventive Medicine and Public Health
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• 제20권1호
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• pp.114-119
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• 1987

The author investigated the effect of some variables such as age, sex and the experience of past vaccination on the validity of PHA. The changing pattern of the validity with the change of PHA diagnostic criteria, and the relationship between PHA test result and RIA Ratio Unit were also studied. The results obtained were as follow; 1) No statistically significant difference was found in sensitivity, specificity and negative predictability by sex, but positive predictability was significantly higher in male than that in female. 2) Positive predictability was shown to become higher with the increase of age and nagative predictability was found to be significally different among age groups, but no statistically significant difference was found in sensitivity and specificity by age group. 3) Significantly low specificity and high positive predictability were found in past vaccined group, but no statistically significant difference was found in sensitivity and negative predictability between past vaccined group and non-vaccined group. 4) False negative cases by PHA were found to be the weak positive reactors by RIA and false positive rate of PHA was as high as 46.3 per cent. 5) Sensitivity and specificity of PHA at the diagnostic criteria of HBsAb titer 1:2 were 98.4% and 53.8% respectively, but after increasing the HBsAb titer to 1:64 as the diagnostic criteria the results were 60.0% and 95.6% respectively.

• 한국콘텐츠학회논문지
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• 제21권6호
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• pp.380-391
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• 2021

본 연구에서는 유아의 부정적 정서성에 따라 어머니의 정서표현성과 유아의 대인간 문제해결 능력에 차이가 있는지를 분석하기 위해 서울 및 인천지역 소재 어린이집과 유치원에 재원 중인 만 5세 유아와 그 어머니 116쌍을 연구대상으로 선정하였다. 수집된 자료는 SPSS 23.0 프로그램을 이용하여 기술통계 및 독립표본 t-검증에 의해 분석되었다. 본 연구의 결과는 다음과 같다. 첫째, 유아의 성별에 따라 슬픔의 정서성에 차이가 나타나서 여아가 남아보다 슬픔의 정서성이 더 높았고, 형제가 없는 유아보다 형제가 있는 유아의 어머니가 부정적 정서표현을 더 많이 하는 것으로 나타났다. 둘째, 부정적 정서성이 낮은 유아보다 부정적 정서성이 높은 유아의 어머니가 부정적 정서를 더 많이 표현한 것으로 나타났다. 셋째, 유아의 대인간 문제해결 능력은 유아의 부정적 정서성에 따른 차이가 나타나지 않았다.

• 환경위생공학
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• 제14권4호
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• pp.180-187
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• 1999

The following is experimental result of Biochemical characteristics of Acetobacter sp. Acetobacter sp. were gram negative, short rod, non-spore-forming and motile. It reacted positively catalase, methyl red, oxidation fementation, voges-proskauer and nitrate reduction tests and hydrogen sulfide test negative and ONPG negative. Acetobacter sp. showed normal growth curve in Carr broth and there was no significant difference between isolates and type strains such as Acetobacter aceti(KCTC 1010), Acetobacter diazotrophicus(KCTC 2859). Acetobacter liquefaciens(KCTC 2804) and Acetobacter pasteurianus(KCTC 1008).

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제12권2호
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• pp.81-95
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• 2008

In this paper, the negative Polya-Eggenberger distribution has been introduced by compounding negative binomial distribution with beta distribution of I-kind which generates a number of univariate contagious or compound (or mixture of) distributions as its particular cases. The distribution is unimode, over dispersed and all of its positive and negative integer moments exist. The difference equation of the proposed model shows that it is a member of the Ord's family of distribution. Some of its interesting properties have been explored besides different methods of estimation been discussed. Finally, the parameters of the proposed model have been estimated by using a computer programme in R-software. Application of the proposed model to some data, available in the literature, has been given and its goodness of fit demonstrated.

• Asia Marketing Journal
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• 제24권3호
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• pp.109-120
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• 2022

The COVID-19 lockdown has had an unprecedented impact on people in various ways. This study evaluates the effect of lockdown repeal from both marketing and public-policy perspectives. Combining the Bayesian multilevel model with the difference-in-differences design, we find that a lockdown repeal has had a negative impact on socialization. Furthermore, the results show that those who have a low level of risk perception are less affected by lockdown repeal. Also, the negative effect of lockdown repeal varies depending on past socialization behaviors; that is, the lockdown-repeal effect is attenuated for those who socialized more than others in the past. Our findings contribute to the intersection of public policy and marketing literature and provide both academic and practical implications.

• 아동학회지
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• 제32권4호
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• pp.115-134
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• 2011

The purpose of this study was to understand children's negative attitudes exhibited towards peers with special needs in an inclusive kindergarten, utilizing ethnographic research methodology. The subjects consisted of 54 children undergoing typical development and three children with special needs in a public kindergarten in Busan metropolitan city. Data collection was conducted by means of participant observations and interviews took place from April until November, 2009. Our results revealed that the responses of 'not acknowledging presence', 'differentiating', 'adapting them to us', 'excluding at play' were major themes in children's negative attitudes exhibited towards peers with disabilities in an otherwise ostensibly inclusive kindergarten. The response of 'not acknowledging presence' was categorized as a way of ignoring their existence, whereas 'differentiating' was categorized as stressing difference, and assuring difference. There were two characteristics related to 'adapting them to us' : adapting them to our ways, adapting them to our knowledge. Concerning 'excluding from play', four characteristics were found : excluding indirectly, excluding directly, excluding illogically, and excluding by seeking majority accord. The implications of the findings for inclusive early childhood education were discussed.

• 보건교육건강증진학회지
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• 제28권4호
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• pp.39-49
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• 2011

Objectives: This study was to examine the association between structural and functional characteristics of social network and self-rated health in middle-aged Korea population. We also explored gender difference in the relationship between social network and health. Methods: Data were collected from individuals aged 40-69 years old participating in the 2005 survey for the Korean Genome & Epidemiology Study. We examined the association between social network, social support, social conflict and self-rated health using multiple logistic regression analysis stratified by gender. Results: The extent and contact frequency of close people, and social participations were associated by not only the positive function but also the negative function of social network. Both the positive and negative functions of social network affected self-rated health. The relationship between the function of social network and health showed a gender difference: only positive function was significantly associated with health in men while only negative function had significant relationship with health in women. Conclusions: Social support and social conflict affected the health in both genders through different ways. The ambivalent effect of social network on health should be explored further.