• Journal of The Korean Association of Information Education
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• v.24 no.2
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• pp.177-188
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• 2020

The purpose of this study was to examine the relationship between techno-stress perceived by elementary school teachers and related variables in a flipped learning environment. To achieve the purpose, the following research question have been established: First, what is the difference between techno-stress perceived by elementary school teachers? Second, what is the difference between techno-stress related variables perceived by elementary school teachers? Third, how do the TPACK, teacher effectiveness, and school environment support, perceived by elementary school teachers, affect technostress? 207 teachers at elementary school responded on a questionnaire to measure their perceived techno-stress, TPACK, teacher efficacy, and school environment support. Data were analyzed with using independent two-sample t-test, one-way ANOVA, and multiple regression analysis. The results were as follows: First, the elementary school teachers working on a leading school perceived higher techno-overload and techno-complexity more than those in ordinary school. Second, the elementary school teachers showed differences in the perception of TPACK, teacher efficacy, and school environment support according to the teacher's career, and leading school. Third, the elementary schools teachers perceived in TK, TCK, TPACK, educational support, and technology have a positive affect with techno-stress. The results are significant in that they provided data for reducing techno-stress of elementary school teachers in a flipped learning environment.

• The korean journal of orthodontics
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• v.37 no.3 s.122
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• pp.182-191
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• 2007

Objective: The purpose of this study was to evaluate the validity of midsagittal reference (MSR) planes constructed in maxillofacial 3D images. Methods: Maxillofacial computed tomography (CT) images were obtained in 36 normal occlusion individuals who did not have apparent facial asymmetry, and 3D images were reconstructed using a computer software. Six MSR planes (Cg-ANS-Ba, Cg-ANS-Op, Cg-PNS-Ba, Cg-PNS-OP, FH${\perp}$(Cg, Ba), FH${\perp}$(Cg, Op)) were constructed using the landmarks located in the midsagittal area of the maxillofacial structure, such as Cg, ANS, PNS, Ba and Op, and FH plane constructed with Po and Or. The six pairs of landmarks (Z, Fr, Fs, Zy, Mx, Ms), which represent right and left symmetry in the maxillofacial structure, were selected. Statistically significant differences of the right and the left measurements were examined through t-test, and the difference of the right and the left measurement was compared among the six MSR planes. Results: The distances from the right and the left landmarks in each pair to each MSR plane did not show a statistically significant difference. The reproducibility of the landmark identification was excellent. Conclusion: All the six planes constructed in this study can be used as a MSR plane in maxillofacial 3D analysis, particularly, the planes including Cg and ANS.

• Management & Information Systems Review
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• v.12
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• pp.137-160
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• 2003

The association between accounting earnings and the stock price of an entity is the subject that has been most heavily researched during the past 25 years in accounting literature. Researcher's common finding is that there are positive relationships between accounting earnings and stock prices. However, the explanatory power of accounting earnings which was measured by $R^2$ of regression functions used was rather low. To be connected with these low results, The prior studies propose that there will be additional information, errors in variables. This study investigates empirically determinants of earnings response coefficients(ERCs), which measure the correlation between earnings and stock prices, using earnings level / change, as the dependent variable in the return/earnings regression. Specifically, the thesis tests whether the factors such as earnings persistence, growth, systematic risk, image, information asymmetry and firm size. specially, the determinable variables of ERC are explained in detail. The image / information asymmetry variables are selected to be connected with additional information stand point, The debt / growth variables are selected to be connected with errors in variables. In this study, The sample of firms, listed in Korean Stock Exchange was drawn from the KIS-DATA and was required to meet the following criteria: (1) Annual accounting earnings were available over the 1986-1999 period on the KIS-FAS to allow computation of variables parameter; (2) sufficient return data for estimation of market model parameters were available on the KIS-SMAT month returns: (3) each firm had a fiscal year ending in December throughout the study period. Implementation of these criteria yielded a sample of 1,141 firm-year observation over the 10-year(1990-1999) period. A conventional regression specification would use stock returns(abnormal returns) as a dependent variable and accounting earnings(unexpected earnings) changes interacted with other factors as independent variables. In this study, I examined the relation between other factors and the RRC by using reverse regression. For an empirical test, eight hypotheses(including six lower-hypotheses) were tested. The results of the performed empirical analysis can be summarized as follows; The first, The relationship between persistence of earnings and ERC have significance of each by itself, this result accord with one of the prior studies. The second, The relationship between growth and ERC have not significance. The third, The relationship between image and ERC have significance of each by itself, but a forecast code doesn't present. This fact shows that image cost does not effect on market management share, is used to prevent market occupancy decrease. The fourth, The relationship between information asymmetry variable and ERC have significance of each by. The fifth, The relationship between systematic risk$(\beta)$ and ERC have not significance. The sixth, The relationship between debt ratio and ERC have significance of each by itself, but a forecast code doesn't present. This fact is judged that it is due to the effect of financial leverage effect and a tendency of interest.

• Korean Journal of Environment and Ecology
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• v.22 no.6
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• pp.625-631
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• 2008

We used the visitation aspect of dabbling ducks(Anas spp.) to investigate the estuarine ecosystem of Nakdong River and to compare the data collected during two periods: trom May, 1989 to April 1993 and from May, 2002 to April 2006. Over for the 8 years of field surveys, 356,110 individuals from 11 species of dabbling ducks(Anas spp.) were observed in the Nakdong estuary. In the early 1990s, the average number of species gradually increased from October through November, whereas the highest numbers of species were recorded in October during the second survey period. The average number of individuals recorded during the second period was 2-3 times higher than that observed in the 1990s. Statistical analysis using a t-test indicated that the number of individuals showed significant difference at 5% level between November and February in both the early 1990s and the mid-2000s. During the winter, dabbling ducks select both estuarine wetlands as resting sites and rice paddy as feeding sites. More wintering migrants including ducks would visit to Nakdong river if we provide with enough rice paddy near the estuary. The farmland around Nakdong estuary is used by dabbling ducks as a habitat, we hope it must be conserved thoroughly. CRP(crop reserve program), implemented by the local government of Kangseo-gu, Busan City is effective in conserving rice paddy; therefore, the CRP program need to be continuously applied in the Nakdong river basin.

• Korean Journal of Environment and Ecology
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• v.31 no.6
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• pp.606-614
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• 2017

This study analyzed the effect of forest therapy program on reduction of stress of teachers and their positive and negative emotions based on the survey of 221 teachers who participated in the overnight Happiness School Edu-healing Camp held for teachers by the National Center for Forest Healing. For data analysis, a paired sample t-test was conducted using the SPSS 24.0 program to examine the difference in the stress reaction index of teachers and their positive and negative emotions before and after their participation in the forest therapy program. The results indicated that teachers who participated in the program showed a significant decrease in the stress response index and the values of sub-domain such as physical symptoms, depression symptoms, and anger symptoms. Moreover, all teachers exhibited a significant decrease in stress. This result verifies that the forest therapy program is effective in reducing the stress of teachers and their negative emotions. These results are expected to be used to promote more active forest therapy programs for teachers exposed to a high level of stress.

• The Journal of Korean society of community based occupational therapy
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• v.9 no.3
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• pp.1-9
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• 2019

Objective : The purpose of this study was to verify the effect of sleep quality on activity participation in the elderly living in the community. Methods : This study was conducted on 200 elderly people using welfare institutions located in Jeollabuk-do from August 21 to September 29, 2019. Data collection was performed using the Korean version of the Pittsburgh Sleep Quality Index (PSQI-K) and the Korean-Activity Card Sort (K-ACS). The data were analyzed by descriptive statistics, independent t-test, Pearson correlation, and simple linear regression analysis. Results : The group with high quality of sleep showed significantly higher participation in instrumental activities, social activities and leisure activities than the group with low quality of sleep (p<.001). The quality of sleep was significantly correlated with instrumental activities, social activities and leisure activities (p<.01). The quality of sleep significantly affected the instrumental activities (R²=.224), social activities (R²=.142) and leisure activities (R²=.227) (p<.001). Conclusion : The quality of sleep needs to be approaches to promote the participation of elderly people living in the community, and development of an intervention program will be needed to improve quality of sleep.

• Journal of Korean Clinical Health Science
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• v.3 no.1
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• pp.299-310
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• 2015

Purpose. The purpose of this study was to investigate level of knowledge and attitude about organ donation in university and provide basic information on correct education and promotion. Method. The sample is consisted of 90 the students related to health and 90 general college students ; total 180 students in J city. The questionnaires were used to obtain the results. Data was collected from November 6th to 8th, 2013. For data analysis, the SPSS for window 12.0 K program was utilized to get descriptive statistics including the percentage, average, standard deviation and t-test. Results. Comparing the results between a series of health students and general college students, a series of health students showed high level of more knowledge and more positive attitude about organ donation than general college students. A series of health showed significant correlation but general college didn't show significant correlation. Conclusion. To educate correct knowledge draw positive attitude about organ donation is needed to improve the level of Knowledge and Attitude about organ donation.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.7
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• pp.4656-4667
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• 2015

The purpose of this study was to investigate relations among the quality of life, health states, physical functions, cognitive functions, and social supports of the elderly at care facilities. The subjects include the elderly that were living in care facilities in some urban areas and aged 65 or older. The data of total 260 old people were used in analysis. Collected data were analyzed with descriptive statistics, t-test, ANOVA, Pearson correlation, and stepwise multiple regression. The elderly at care facilities, who were considered as physically and cognitive vulnerable, scored higher means on quality of life when they were satisfied with the length of stay and sleeping state, had higher subjective health states, had no tooth inconvenience and forgetfulness, suffered from a lower level of depression, had better cognitive functions, and received higher social supports. Quality of life had correlations with the sleeping state(r=-.20, p<.001), subjective health state(r=-.24, p<.001)s, depression(r=-.30, p<.001), and social supports(r=.30, p<.001). Social supports(${\beta}=.30$, p<.001), depression(${\beta}=-.25$, p<.001), subjective health states(${\beta}=-.22$, p<.001), length of stay(${\beta}=-.22$, p<.001), and sleeping state(${\beta}=-.12$, p=.025) turned out to predict the quality of life of the elderly at care facilities and have close relations with it. In short, the quality of life of the elderly is related to many different factors at care facilities. The findings indicate that nursing interventions and managements for quality of life require a mental and social approach or a whole person approach with a focus on the understanding of individual senior citizens rather than on physical activities and diseases.

• Korean Chemical Engineering Research
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• v.56 no.4
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• pp.568-576
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• 2018

In order to investigate the adsorption characteristics of the antibiotics trimethoprim (TMP) by activated carbon (WCAC) prepared from waste citrus peel, the effects of operating parameters on the TMP adsorption were investigated by using a response surface methodology (RSM). Batch experiments were carried out according to a four-factor Box-Behnken experimental design with four input parameters : concentration ($X_1$: 50-150 mg/L), pH ($X_2$: 4-10), temperature ($X_3$: 293-323 K), adsorbent dose ($X_4$: 0.05-0.15 g). The experimental data were fitted to a second-order polynomial equation by the multiple regression analysis and examined using statistical methods. The significance of the independent variables and their interactions was assessed by ANOVA and t-test statistical techniques. Statistical results showed that concentration of TMP was the most effective parameter in comparison with others. The adsorption process can be well described by the pseudo-second order kinetic model. The experimental data of isotherm followed the Langmuir isotherm model. The maximum adsorption amount of TMP by WCAC calculated from the Langmuir isotherm model was 144.9 mg/g at 293 K.

• Journal of Digital Convergence
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• v.13 no.10
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• pp.59-68
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• 2015

This study compared and analyzed the connection use, using behaviors and life satisfaction of paid users and free users in accordance with the business models of convergence N-screen service providers. It also analyzed factors that influence users' satisfaction at a personal life level, a relationship-based life level and a group-based life level. The study result showed the different connection use levels of broadcast contents by paid and free users of the N-screen service have a statistically significant meaning. The result also showed the personal satisfaction level of paid users is higher than that of free users. It also turned out that factors that influence life satisfaction differ according to whether or not the users paid for the service. Also, academic background and content consumption expenses affected life satisfaction level of free users while connection use of broadcast contents affected the one of paid users. This study provided an insight on the current domestic N-screen market situation and suggested business strategies which could help find business models.