• Korean Journal of Ecology and Environment
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• v.50 no.3
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• pp.325-336
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• 2017

The ecosystem in the Gwangju Stream has taken a wide range of disturbance such as the discharging water of sewage treatment plant, the lake water and the river water from different water system over the past decade. This study was figured out some significant influence factors by analyzing the relationship between biotic and abiotic factors in the urban stream. Abiotic components included 15 water quality variables which were measured in five sampling sites along the stream from October 2014 to July 2015, whereas the benthic macroinvertebrates found in those sites were used to estimate various biotic indices representing the ecological status of the community. The results of correlation analyses indicated that abiotic factors by human activities affected on the inhabitation of benthic macroinvertebrates more than biotic factors. The results of cluster analyses and ANOVA tests also showed that biotic and abiotic characteristics were clearly different in season. The main influence factors of cluster analysis by sites were $NH_3-N$, EPT(I) and DO. It was considered that more various statistical analyses would be necessary to find some different relationships and influence factors between biotic and abiotic variables in the urban stream.

• Journal of Family Relations
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• v.20 no.4
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• pp.3-24
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• 2016

Objectives: The main purpose of this study was to examine how family strengths affect friend attachment and psychological well-being among college students and to analyze the relative influence of these two variables on psychological well-being. Method: Data were collected by self-administered questionnaire method from 362 university students in four different regions. The data were analyzed through various statistical methods such as t and F tests, Pearson's correlation analyses, and multiple regression analyses. Results: First, there were significant differences in the level of psychological well-being according to gender and the monthly family income, showing that males and higher family income group reported greater psychogocal-well-being level. Males also reported lower level of anxious attachment. Second, correlational analyses results indicated that college students' psychological well-being was positively related with family strengths and secure attachment, and was negatively correlated with avoidant and anxious attachment. Finally, the results of hierarchical multiple regression analyses indicated that college student's psychological well-being was influenced by family communication, secure attachment, and anxious attachment, showing that anxious attachment was the most influential variable. Conclusions: This study suggests the importance of providing education and/or counseling services focusing on strengthening the positive relationship with their friends and on increasing the family communication for college students' psychological well-being.

• Phonetics and Speech Sciences
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• v.14 no.2
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• pp.11-17
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• 2022

English vowels play an important role in verbal communication. However, Korean students tend to experience difficulty pronouncing a certain set of vowels despite extensive education in English. The aim of this study is to apply speech recognition software to evaluate Korean students' pronunciation of English vowels in minimal pair words and then to examine acoustic characteristics of the pairs in order to check their pronunciation problems. Thirty female Korean college students participated in the recording. Speech recognition rates were obtained to examine which English vowels were correctly pronounced. To compare and verify the recognition results, such acoustic analyses as the first and second formant trajectories and durations were also collected using Praat. The results showed an overall recognition rate of 54.7%. Some students incorrectly switched the tense and lax counterparts and produced the same vowel sounds for qualitatively different English vowels. From the acoustic analyses of the vowel formant trajectories, some of these vowel pairs were almost overlapped or exhibited slight acoustic differences at the majority of the measurement points. On the other hand, statistical analyses on the first formant trajectories of the three vowel pairs revealed significant differences throughout the measurement points, a finding that requires further investigation. Durational comparisons revealed a consistent pattern among the vowel pairs. The author concludes that speech recognition and analysis software can be useful to diagnose pronunciation problems of English-language learners.

• Journal of Korean Physical Therapy Science
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• v.18 no.2
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• pp.17-28
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• 2011

Purpose: The aim of this study was to ascertain the effects of the lower extremity muscle strengthening exercise on balance and ambulation of children with cerebral palsy. Methods: 10 subjects who participated in this research undertook the 12-week the lower extremity muscle strengthening exercise program, which consisted of a series of mat exercises and sling exercises. The statistical significances were examined by using Wilcoxon signed-rank test, a non-parametric test, for evaluating the improvement of balance and ambulation of the subjects. In order to evaluate the correlation among the variables, Pearson's correlation coefficients were also calculated. In all statistical analyses the significance level was selected as ${\alpha}$=0.05. Results: Berg balance scale(BBS) was significantly increased after the intervention(p<.05). Percentage weight bearing(PWB) was decreased after the intervention, but there was no significant difference. Time up and go test(TUG) value was significantly decreased(p<.05). Gait velocities was increased after the intervention, but there was no significance. Stride length, step lengths of the affected side and the sound side were significantly increased after the intervention(p<.05). In the correlation analyses of the measures before the intervention, TUG had significant negative correlation to BBS and gait velocity(p<.05). Stride length, step lengths of the sound side and the affected side had significant positive correlation between themselves(p<.01). In the correlation analyses of the measures after the intervention, TUG had significant negative correlation to BBS and gait velocity(p<.05). BBS revealed significant positive correlations to stride length, step lengths of the sound side and the affected side(p<.05). Stride length, step lengths of the sound side and the affected side had significant positive correlation between themselves(p<.01). Conclusion: Based upon the outcomes as above, it is likely that the muscle strength exercises have substantial effects on balance and ambulation of children with cerebral palsy. Thus various lower extremity muscle strengthening exercise programs are required to be studied and developed in order to contribute to functional improvements of children with cerebral palsy.

• Science of Emotion and Sensibility
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• v.20 no.2
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• pp.149-160
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• 2017

In hypothesis testing, the interpretation of a statistic obtained from the data analysis relies on a probabilistic distribution of the statistic constructed according to several statistical theories. For instance, the statistical significance of a mean difference between experimental conditions is determined according to a probabilistic distribution of the mean differences (e.g., Student's t) constructed under several theoretical assumptions for population characteristics. The present study explored the logic and advantages of random-resampling approach for analyzing event-related potentials (ERPs) where a hypothesis is tested according to the distribution of empirical statistics that is constructed based on randomly resampled dataset of real measures rather than a theoretical distribution of the statistics. To motivate ERP researchers' understanding of the random-resampling approach, the present study further introduced a specific example of data analyses where a random-permutation procedure was applied according to the random-resampling principle, as well as discussing several cautions ahead of its practical application to ERP data analyses.

• Korean Management Science Review
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• v.34 no.3
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• pp.61-77
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• 2017

This study investigates the effect of consumer involvement in the relationship between customer satisfaction and loyalty (which is measured as consumers' repurchase and WOM intentions). Previous research has presented inconsistent implications on the role of consumer involvement in the relationship. Some researchers have presented the empirical results showing that consumer involvement moderates the relationship, whereas others have done the empirical results implying that the consumer involvement does not moderates. In sum, the previous empirical studies have provided the inconsistent empirical results that consumer involvement may be a moderator or a non-moderator in the relationship between customer satisfaction and loyalty. Thus, we start this research with two research questions: "Does consumer involvement has a moderation effect on the relationship between-customer satisfaction and loyalty across various service industries?" and "Can the moderation effect of consumer involvement be detected differently depending on the statistical methods used to probe the moderation effect?" A questionnaire survey was conducted in the context of four service categories: eight service firms for fast food, four firms for family restaurant, four firms for movie theater and four firms for Bakery. Hierarchical regression analyses (moderated regression analyses) and chi-square difference tests were used to identify the role of consumer involvement in the relationship between customer satisfaction and loyalty. The empirical results show that there does not exist the difference in the moderation effects of consumer involvement identified by the two statistical methods (i.e., hierarchical regression analyses vs. chi-square difference tests), however, that there exists the difference in the identified moderation effects of consumer across service categories. In the final section, we summarize the implications and re-interpret the empirical results provided in the previous studies.

• Korean Journal of Ichthyology
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• v.18 no.4
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• pp.293-299
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• 2006

Copper,zinc superoxide dismutase (Cu,Zn-SOD) plays a key role to the first antioxidant defense system against oxidative stress in diverse aerobic organisms. Due to the housekeeping action of Cu,Zn-SOD, it was reported that the structure and function have been conserved during evolution. In this study Cu,Zn-SOD from cloudy catshark Scyliorhinus torazame was subjected to phylogenetic analyses to know its evolutionary relationship in the vertebrate lineage. Molecular phylogenetic trees inferred by NJ, MP, ML and/or Bayesian analyses showed two shark species, Prionace glauca and S. torazame grouped together with high statistical supports. In general, they placed at the separated position from bony vertebrates. Thereafter, bony vertebrates composed of teleosts and birds/mammals (amniotes) formed a monophyletic group. Each teleost and amniote clade was also supported by relatively high statistical values. These phylogenetic relationships are well congruent with the phylogenetic hypothesis of the ancestral position of cartilaginous fishes to bony vertebrates.

• Asian Pacific Journal of Cancer Prevention
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• v.13 no.4
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• pp.1675-1682
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• 2012

Aim: The study aim was to determine the frequency with which women decline clinicians' treatment recommendations and variations in this frequency by age, cancer and service descriptors. Design: The study included 36,775 women diagnosed with early invasive breast cancer in 1998-2005 and attending Australian and New Zealand breast surgeons. Rate ratios for declining treatment were examined by descriptor, using bilateral and multiple logistic regression analyses. Proportional hazards regression was used in exploratory analyses of associations with breast cancer death. Results: 3.4% of women declined a recommended treatment of some type, ranging from 2.6% for women under 40 years to 5.8% for those aged 80 years or more, and with parallel increases by age presenting for declining radiotherapy (p<0.001) and axillary surgery (p=0.006). Multiple regression confirmed that common predictors of declining various treatments included low surgeon case load, treatment outside major city centres, and older age. Histological features suggesting a favourable prognosis were often predictive of declining various treatments, although reverse findings also applied with women with positive nodal status being more likely to decline a mastectomy and those with larger tumours more likely to decline chemotherapy. While survival analyses lacked statistical power due to small numbers, higher risks of breast cancer death were suggested, after adjusting for age and conventional clinical risk factors, (1) for women not receiving breast surgery for unstated reasons (RR=2.29; p<0.001); and (2) although not approaching statistical significance $p{\geq}0.200$), for women declining radiotherapy (RR=1.22), a systemic therapy (RR1.11), and more specifically, chemotherapy (RR=1.41). Conclusions: Women have the right to choose their treatments but reasons for declining recommendations require further study to ensure that choices are well informed and clinical outcomes are optimized.

• Journal of Ecology and Environment
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• v.33 no.1
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• pp.37-45
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• 2010

I conducted extensive analyses of daily weather data of precipitation and temperature monitored from the Surface Synoptic Meteorological Station in Seoul from 1 October 1907 to 31 December 2009 to understand how the climate is changing and the ecological implications for Seoul, Korea. Statistical analyses of the data, including the lengths of seasons and growing degree-days (GDD), showed a clear warming trend in the Seoul area over the study period. The mean daily temperature in Seoul increased by $2.40^{\circ}C$ over the period of one hundred years, which was about three times faster than the global trend and it was striking to notice that mean daily temperature in Seoul in recent 30 years was increasing with the rate of $5.50^{\circ}C$ per hundred years, which is an extremely fast rate of increase in temperature. In the last 100 years, an increase in the number of summer days was apparent, coupled with a reduction in the average number of winter days for about 27 to 28 days based on the analysis of mean daily temperature. Although the lengths of spring and autumn have not changed significantly over the century, early initiations of spring and late onsets of autumn were quite apparent. Total annual precipitation significantly increased at the rate of 2.67 mm/year over the last 100 years, a trend not apparent if the analysis is confined to periods of 30 to 40 years. The information has the potential to be used not only for better understanding of ecological processes and hydrology in the area, but also for the sustainable management of ecosystems and environment in the region.

• Korean journal of food and cookery science
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• v.24 no.6
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• pp.788-800
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• 2008

This study was executed in order to analyze the purchasing practices, preferences, and satisfaction of consumers purchasing ready-to-eat foods. The study was executed from the $20\;May{\sim}30\;June$ 2007 in the Daegu and Gyeongsangbuk-do area. Questionnaires were distributed among 480 people. Of these, 410 questionnaires were collected and applied to a statistical analysis. Statistical analyses were conducted using the SPSS package program (version 14.0 for windows). The results of the statistical analyses were as follows. 42.4% males and 57.6% females participated in this study. The biggest motivation behind the purchase of ready-to-eat foods was convenience, 51.0%. The most common venues where these foods were purchased were supermarkets or discount marts, 67.6%. The ratio of substituting ready-to-eat foods for meals was 70.5%. The consumption practices of ready-to-eat foods of the consumers according to purchase place illustrated significant differences in the average expense per person each time (p<0.01), co-consumer (p<0.001), and age (p<0.05). The purchase preference was high with kimbaps (73.4%), hamburgers (29.8%), sushis (29.0%), and sandwiches (27.9%). Unmarried individuals showed a significantly higher overall liking and satisfaction for ready-to-eat foods than married individuals (p<0.001). Individuals living without a family was significantly higher overall liking and satisfaction than individuals living with a family (p<0.05). Individuals who spent an average of 10,000 won per time showed a significantly higher overall liking and satisfaction than those who spent below 10,000 won per time (p<0.05). In the presence of a friend as a co-consumer of ready-to-eat foods, satisfaction was significantly high (p<0.01). Consumers who purchased ready-to-eat foods at meal times, showed a significantly higher overall liking, compared to those who purchased such food products in between meal times (p<0.01). The preference and satisfaction degree of the consumer must be reflected by product development, quality improvement and marketing plan establishment.