• Korean Journal of Childcare and Education
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• v.8 no.6
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• pp.257-274
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• 2012

The purpose of this study is to examine the reality of early childhood education and recognition of its teachers. The subjects of this study were 173 day care center teachers. They were surveyed by questionnaire and the results were tabulated using descriptive statistics. According to the result, 1) the majority answered that test cohort is two years children, number of subject is between 10 and 20 children, required time is 20-30 minutes, frequency is once a week, and teaching duration is more than a year. 2) It was reported that the education plan is usually submitted to day care center teachers and if it is not well linked, there are not many things that can be revised after consultation with teacher, even though it is well delivered. 3) Although they answered that the preparation of teaching materials for music activities were well used, the efficiency of the material towards children was reported as just normal. 4) There was a replacement of the music teacher during the specialized music education program.

• Korean Journal of Childcare and Education
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• v.11 no.2
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• pp.355-373
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• 2015

The purpose of this study was to test the mediation effect of marital communication with spouse between maternal gatekeeping and paternal parenting involvement. The participants were 210 fathers and their toddler children. The survey was rated by the fathers. The collected data were analyzed by descriptive statistic, Pearson's product-moment correlation and hierarchical multiple regression. The mediating effect was tested by Baron & Kenny's(1986) four steps. The results of this study were as follows: First, the maternal gatekeeping had a negative effect on the paternal parenting involvement. Second, the maternal gatekeeping consolidated the paternal permissiveness and non interventional child rearing behavior. The mediating effect of marital communication was significantly complete. The marital communication was key factor can help to increase paternal involvement and lead to paternal positive parenting behavior. The discussion included the suggestion for encouraging the paternal involvement and positive child rearing behavior.

• Asian Pacific Journal of Cancer Prevention
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• v.14 no.4
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• pp.2503-2508
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• 2013

Histone deacetylation mediated by histone deacetylases (HDACs) has been reported as one of the epigenetic mechanisms associated with tumorigenesis. The poor responsiveness of anticancer drugs found with cholangiocarcinoma (CCA) leads to short survival rate. We aimed to investigate mRNA expression of HDACs class I and II, and the effect of HDAC inhibitors, suberoylanilide hydroxamic acid (SAHA) and valproic acid (VPA), in CCA in vitro. Expression of HDACs was studied in CCA cell lines (M213, M214 and KKU-100) and an immortal cholangiocyte (MMNK1) by semi-quantitative reverse transcription-PCR. SAHA and VPA, as well as a classical chemotherapeutic drug 5 -fluorouacil (5-FU) were used in this study. Cell proliferation was determined by sulforhodamine assay. $IC_{50}$ and $IC_{20}$ were then analyzed for each agent and cell line. Moreover, synergistic potentional of VPA or SAHA in combination with 5-FU at sub toxic does ($IC_{20}$) of each agent was also evaluated. Statistic difference of HDACs expression or cell proliferation in each experimental condition was analyzed by Student's t-test. The result demonstrated that HDACs were expressed in all studied cell types. Both SAHA and VPA inhibited cell proliferation in a dose-dependent manner. Interestingly, KKU-100 which was less senstitive to classical chemotheraoeutic 5-FU was highly was sensitive to HDAC inhibitors. Simultaneous combination of subtoxic doses of HDAC inhibitors and 5-FU signiicantly inhibited cell proliferation in CCA cell lines compared to single sgent treatment($P{\leq}0.01$), while sequentially combined treatments were less effective. The present study showed inhibitory effects of HDACIs on cell proliferation in CCA cell lines, with synergistic antitumor potential demonstrated by simultaneous combination of VPA or SAHA with 5-FU, suggesting a novel alternative therapeutic strategy in effective treatment of CCA.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.3
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• pp.799-818
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• 2014

Spectrum sensing is a key technical challenge for cognitive radio (CR). It is well known that multi-cycle cyclostationarity (MC) detector is a powerful method for spectrum sensing. However, conventional MC detector is difficult to implement due to its high computational complexity. This paper pays attention to the fact that the computation complexity can be reduced by simplifying the test statistic of conventional MC detector. Based on this simplification process, an improved MC detector is proposed. Compared with the conventional one, the proposed detector has the low-computational complexity and sufficient-accuracy on sensing performance. Subsequently, the sensing performances are further investigated for the cases of Rayleigh, Nakagami-m, Rician, composite Rayleigh fading-lognormal shadowing and composite Nakagami fading-lognormal shadowing channels, respectively. Furthermore, the square-law combining (SLC) is introduced to improve the detection capability over fading-shadowing channels. The corresponding closed-form expressions of average detection probability are derived for each case by the moment generation function (MGF) approach. Finally, illustrative and analytical results show that the efficiency and reliability of proposed detector and the improvement on sensing performance by SLC over composite fading-shadowing channels.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.11
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• pp.5375-5379
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• 2012

Introduction: Published studies on the association between Nijmegen breakage syndrome 1(NBS1) gene polymorphisms and breast cancer risk have been inconclusive, and a meta-analysis was therefore performed for clarification. Methods: Eligible articles were identified by a search of MEDLINE and EMBASE bibliographic databases for the period up to March 2012. The presence of between-study heterogeneity was investigated using the chi-square-based Cochran's Q statistic test. When there was statistical heterogeneity, the random effects model was chosen; otherwise, fixed effects estimates were reported as an alternative approach. Results: A total of 11 eligible articles (14 case-control studies) were identified, nine case-control studies were for the 657del5 mutation (7,534 breast cancer cases, 14,034 controls) and five case-control studies were for the I171V mutation (3,273 breast cancer cases, 4,004 controls). Our analysis results indicated that the 657del5 mutation was associated with breast cancer risk (carriers vs. non-carriers: pooled OR =2.63, 95% CI: 1.76-3.93), whereas the I171V mutation was not (carriers vs. non-carriers: pooled OR =1.52, 95% CI: 0.70-3.28). Conclusion: The present meta-analysis suggests that the 657del5 gene mutation in the NBS1 gene plays a role in breast cancer risk, while the I171V mutation does not exert a significant influence.

• The Journal of Engineering Geology
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• v.19 no.3
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• pp.261-268
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• 2009

Tunnel measurements provide crucial information on the ground stability during the excavation, visualizing the ground behavioral characteristics with quantitative dada. Generally, the frequency of the measurements is greater during the early stage of the tunnelling process and reduced with time. However, there are no quantitative criteria established for either the activities, such as the time, location and frequency of the measurement or the management guidance, especially for the site of subtle and unexpected displacement during the excavation. It is, however, still challenging to assess behavioral characteristics of subtle and unexpected displacement after stabilization. In this study, we propose a new method to assess stability and to analysis the behavioral characteristics of subtle and unexpected displacement after stabilization using statistic control charts of displacements. We also present a test result on the applicability of control chart and CUSUM control chart to measured displacements.

• Journal of the Korean Society of Costume
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• v.59 no.6
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• pp.1-15
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• 2009

The purpose of this study is to examine the effect of the cause marketing on fashion brand credibility, purchase and words of mouth ("WOM") intentions. This study adopted a survey method with the questionnaire. Data were collected from respondents who were graduated from higher than elementary school students. The data were analyzed by using statistic methods such as frequency analysis, factor analysis, reliability test and structural equation modelling. The results of the data analysis of this study are as follows; firstly, brand familiarity and customer attitude have a directly positive effect on the credibility, purchase and WOM intentions. Fashion business companies should work up the ways of communications with the customers besides cause marketing for the brand familiarity. It is necessary for customers to be known about how the fashion business companies participate in cause marketing to enhance the value of positive brand attitude. Secondly, while the brand familiarity on the credibility, purchase and WOM intentions are effective to female customers, the brand attitude is effective to male customers. Thirdly, even though it was showed that the credibility of fashion brands have no significant effects on purchase and WOM intention, it is due to its own nature of fashion business and it is founded in preceding research that high-involved fashion products may have different results in comparison with the practical products.

• Journal of the Korean Society of Clothing and Textiles
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• v.36 no.10
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• pp.1040-1049
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• 2012

This study examines the effects of pursued benefits and satisfaction (or dissatisfaction) on repurchase intentions. The research was comprised of a 2 (satisfaction after purchase: satisfaction versus dissatisfaction) ${\times}2$ (product benefit type: utilitarian benefit versus hedonic benefit) ${\times}2$ (hyperopic disposition: high versus low) model, designed with three mixed elements. The subject participants of this study were 168 female university students aged 20 to 29 from the Seoul, Gyeong-gi do, and Chung-cheong do areas. We performed a reliability analysis, T-test, and ANOVA using the SPSS statistic package. The results of this study are summarized as follows. In terms of product benefit that influences repurchase intention based on whether a consumer has experienced satisfaction after purchasing a fashion product, repurchase intention was high for hedonic benefits regardless of the level of satisfaction or dissatisfaction after a purchase. However, we found a significant difference in preference when the hyperopic disposition of a consumer was taken into account. When dissatisfied with a purchase, consumers with low levels of hyperopic disposition displayed higher repurchase intentions for the products of hedonic benefit than those of utilitarian benefits. However, when dissatisfied with a purchase, consumers with high levels of hyperopic disposition displayed low levels of repurchase intention regardless of the type of product benefit. When consumers are satisfied with a purchase, they are more likely to repurchase hedonic products than utilitarian products.

• The Korean Journal of Applied Statistics
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• v.14 no.1
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• pp.39-57
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• 2001

Categorical data has sometimes misclassification errors. If this data will be analyzed, then estimated cell probabilities could be biased and the standard Pearson X2 tests may have inflated true type I error rates. On the other hand, if we regard wellclassified data with misclassified one, then we might spend lots of cost and time on adjustment of misclassification. It is a necessary and important step to ask whether categorical data is misclassified before analyzing data. In this paper, when data is misclassified at one of two variables for two-dimensional contingency table and marginal sums of a well-classified variable are fixed. We explore to partition marginal sums into each cells via the concepts of Bound and Collapse of Sebastiani and Ramoni (1997). The double sampling scheme (Tenenbein 1970) is used to obtain informations of misclassification. We propose test statistics in order to solve misclassification problems and examine behaviors of the statistics by simulation studies.

• The Korean Journal of Applied Statistics
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• v.22 no.1
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• pp.29-39
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• 2009

Among others, ROC and CAP curves are used to explore the discriminatory power between the defaults and non-defaults, based on the distribution of the probability of default in credit rating works. ROC and CAP curves are plotted in terms of various ratios of the probability of default. Each point on ROC and CAP curves is calculated according to cutting points (scores) for classifying between defaults and non-defaults. In this paper, adjusted ROC and CAP curves are proposed by using functions of ratios of the probability of default. It is possible to recognize the score corresponding to a point oil these adjusted curves, and we can identify the best score to show the optimal discriminatory power. Moreover, we discuss the relationships between the best score obtained from the adjusted ROC and CAP curves and the score corresponding to Kolmogorov - Smirnov statistic to test the homogeneous distribution functions of the defaults and non-defaults.