• Journal of the Korean Data and Information Science Society
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• v.27 no.5
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• pp.1253-1262
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• 2016

When there exists a change-point in hazard function, it should be estimated for exact parameter or hazard estimation. In this research, we compare the hazard change-point estimators. Matthews and Farewell (1982) parametric change-point estimator is based on the likelihood and Zhang et al. (2014) nonparametric estimator is based on the Nelson-Aalen cumulative hazard estimator. Simulation study is done for the data from exponential distribution with one hazard change-point. The simulated data generated without censoring and the data with right censoring are considered. As real data applications, the change-point estimates are computed for leukemia data and primary biliary cirrhosis data.

• Journal of the Korean Society of School Health
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• v.30 no.1
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• pp.21-28
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• 2017

Purpose: This study was conducted to examine the effect of foot-bath on lower extremities edema and fatigue among college students in Korea. Methods: This study used an quasi-experimental design with 56 participants (30 for experiments and 26 for controls). The experimental group performed 20-minute foot bath before sleep three times for one week. All subjects were directed to use their smart-phones to fill out a questionnaire about fatigue. Leg circumference was measured 10 minutes after foot bath. The test was performed from April 30th to May 22th in 2016. Data was analyzed using t-test and $x^2$ test. Results: We found no difference in general characteristics between the experimental group and the control group. Left leg edema of the experimental group decreased by $16.63{\pm}14.57mm$ (p<.001). The experimental group's right leg-edema decreased by $13.10{\pm}13.97mm$ (p<.001). There was no statistically significant difference in their fatigue level when comparing before and after the foot baths. Conclusion: We found that doing foot baths for two weeks could have positive effects in reducing leg-edema among college students. Foot bath may be applied as an effective nursing intervention to decrease leg edema among young people. The results are based on a limited number of study samples and a short-term intervention. Further research can be performed with extended population and a prolonged study period.

• Asia Marketing Journal
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• v.14 no.3
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• pp.103-118
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• 2012

Although music is one of the most important attributes of broadcasting communications, few studies have examined the relationship between background music and the behavior of audiences, particularly in the context of TV home shopping programs, where purchase decisions are made while watching the show. The objective of this study is to examine whether certain characteristics of music in broadcasting communications can affect the audiences' purchase intentions or behaviors. Unlike previous studies on this issue, this study considers the impulse-inducing capability (IIC) of music as an important variable affecting consumers' purchase intension. A 2×3 (high/low involvement and high/low/no IIC music) between subjects design was used for the experiments in the study. The TV home shopping programs in the high or low involvement condition were identical except for the type of background music: high IIC music, low IIC music, and no music. A total of 188 undergraduate students at a college in Seoul, South Korea participated in the study. Their ages range from 20 to 25 (median age = 22), and nearly 60% were male. Our analysis showed that in the low involvement condition, high IIC music was more likely to have a positive effect on purchase intentions than low IIC (common) music or no music did. Meanwhile, there was not any significant relationship between music and purchase intentions in the high involvement condition. Given that previous studies have provided no clear evidence of the effects of music on consumers' purchase intentions or behaviors, this study makes an important contribution to the literature in this field. The result of this study provides implications to the practitioners in the market, too. Marketers need to reevaluate the value of music used in broadcasting communications and pay more attention to find the right music for their campaigns. Limitations of this study as well as directions for future studies are also discussed.

• Culinary science and hospitality research
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• v.18 no.3
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• pp.191-205
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• 2012

Due to a surplus of rice on the market, there has been a growing interest in developing better processed rice products, especially rice liquor or spirits which are popular and have a large market value. In this study, Takju was made with different varieties of rice and rice powder particle sizes, after which a taste survey was performed and measurements were taken on the characteristics of Takju including the temperature of the fermenting material, sugar content, alcohol content, acidity, amino acid types, colors, etc. The varieties of rice used in the study included Chucheong, Hiami and Anda. The temperature of the brew for each kind of Takju reached its highest point 48 hours after preparation. Differences among rice varieties were only apparent in the acidity and taste evaluations. The acidity was found to be highest with Anda, followed by Chuchoeng and Hiami. Chuchoeng had the highest taste evaluation scores. With regards to particle sizes, the alcohol content and acidity were found to be highest with coarse rice powder while ultra fine rice powder showed the highest fermenting temperature, sugar content, acidity, amino acid type, pH level, color and taste scores right after preparation. The results of this study suggest that among the kinds of Takju made from different rice varieties and particle sizes, the one made from Chucheong ultra fine rice powder is the most preferable over other variations.

• Journal of Technologic Dentistry
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• v.32 no.4
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• pp.387-401
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• 2010

Purpose: The work of Dental technician which is part of national dental health, is more specialized recently. This research provides fundamental data from analyzing student's career consciousness according to needs of a career education. Here is the conclusion of the analysis about student's career consciousness, that is for a right choice of career. Methods: This study did questionnaire to a dental Laboratory Technology student who locate in Taegu. Question response student number was 570 people. Response contents analyzed to 506 people except imperfect questionnaire. Data used windows sas 8.0 program and did descriptive statistical analysis. Results: There is a meaningful difference in what they want to know about an occupation according to ages. (${\rho}$ < 0.01) All ages are similar to their occupational thinking, however they who are under twenties consider working environment. Most motives of an entrance are similar, there is a meaningful difference. (${\rho}$ < 0.05) According to a grade of college, there is a meaningful difference how to obtain informations of a career. (${\rho}$ < 0.05) Sophomores and juniors obtain information from seniors or family, however freshmen obtain from the internet because of an accessibility. There is a meaningful difference of a job meaning between men and women. (${\rho}$ < 0.01) Men are working for a means of living. But women give weight to a self-development. The older they grow, the more they know about their aptitude. Selecting subjects are different choosing time & motive. According to ages and where they are from, there is a meaningful difference how much know about their aptitude. (${\rho}$ < 0.05) Older Students know more than young students. Selecting subjects are different choosing time & motive. In accordance with a grade, ages, and where they are from, there are different degrees about how much know their interests. There is a meaningful difference of a choosing major period and choosing informations. (${\rho}$ < 0.01) And also there is a meaningful difference where they are from and why they enter to College. (${\rho}$ < 0.001) In accordance with a grade, ages, and where they are from, there are different degrees about how much know their aptitude. There is a meaningful difference of a choosing major period. (${\rho}$ < 0.01) And also there is a meaningful difference why they enter to College. (${\rho}$ < 0.001) Conclusion: Although we know that a career education is very important, however lots of students select a career without their aptitude & interest & character. We need to teach a career education systematically; considering students career consciousness, with a proper career guidance, cultivating career consciousness.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.40 no.1
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• pp.55-88
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• 2014

In this study, we examined the use of cosmetics among adolescents in our country and their purchasing behavior, as the use of cosmetics has increasingly been prevailing in the younger generation. The aims of this study were to investigate the state of the youth cosmetics market, to grasp the needs of youth and ultimately to suggest the right directions for the youth cosmetics market. The subjects in this study were 1,092 boys and girls from 10 selected secondary schools in Seoul. After a survey was conducted, the answer sheets from 1,074 respondents were gathered, and the collected data were analyzed by the statistical package (SPSS WIN 18.0). The vast majority of the teens participated in the survey were answered to use basic cosmetics daily, and there was a gradual increase in the frequency that they used color cosmetics. They started to use cosmetics earlier in ages than the older generations. Most of them were in trouble due to acne, and the most dominant way to get rid of their skin troubles was by using cosmetics. The most common place at which they purchased cosmetics were brand shops, and they gave priority to the function of the products when they bought cosmetics. The adolescents were still told by their schools to abstain from using cosmetics, and that was the case for social climate as well. Yet they definitely wanted to be allowed to use cosmetics.

• Journal of the Korean Society of Costume
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• v.4
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• pp.13-24
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• 1981

The color yellow was considered from ancient time to the Chosun Dynasty as the central color. Thus, this color became the royal color for the costumes in the palace. It is generally known to usthat the color yellow was controled in use both for the general public and in the royal palaces. However, in the later part of Chosun Dynasty, the color yellow was used not only for the king's costumes but also used for women's tops and for the linings of clothing. Especially, in some of the costumes that belonged to the later period of the Chosun Dynasty, we can still see lots of bright yellow tops. Also there are many green dyed official robes and various costumes for women. It is a true fact that people could not derive the color green from the plants as they did with yellow. The only way they could make the color green was to mix indigo and yellow together. By repeating the difficult process of making various dyes constantly during many centuries, the Korean people developed the marvelous technique of making natural color. Those plants used to make the color yellow are ; Gardenia, Phellodendron amurense, Turmeric, Coptis, Safflower, Arthraxon hispidus, Styphnolobium japonicum. While synthetic dye causes pollution, natural coloring by plants is as safe and useful as the color itself is lovely. Yet it is tragic to know that this traditional culture of making beautiful natural colors was cut off. There is no way to know today the traditionally correct method to derive colors from the plants. Therefore, it is our aim and challenge to find out the original way to dye and develop it and preserve it as our non-polluted folk art. In regard to natural dyeing, we must say that is very difficult to prepare and preserve natural dyes. In the first place, people had to get the right plants at an appropriate time. Then they could not keep those plants too long. Finally, much depended upon the mordant as well as various conditions and dyeing procedures. All those things influenced greatly the quality of color, some times producing a very pretty color and other times a very dull one. It is very appropriate that the natural dye art should be recognized and appreciated anew by Korea since it provides satisfaction to historical and folk artistic demands as well as to those of fashion conscious modern society for high quality consumption items. We propose two stages of development. The first stage is to explore native dye plants and encourage their cultivation. The second stage is to extract from the plants desirable dye which will enhance national culture.

• Journal of Korean society of Dental Hygiene
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• v.10 no.6
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• pp.991-1000
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• 2010

Objectives : The purpose of this study was to analyze 356 papers included in the Journal of the Korean Society of Dental Hygiene between 2000 when the initial number was issued and April, 2010. The papers involved articles, treatises, theses and dissertations. Methods : According to existing literature related to paper analysis, all the journals were analyzed by year to find out the subjects of the studies, places for data gathering, the presence or absence of research funds supplied, the number of researchers, research methods, methods of data collection, themes and data analysis methods. Results : As for subjects, the largest group of the papers that numbered 69(20.7%) examined dental hygienists, and the second biggest group that numbered 65(19.5%) examined dental hygienists and students. The third greatest group that numbered 47(14.2%) examined patients at dental hospitals and clinics. Concerning places of data gathering, schools(37.1%) were the most common places where data were collected, followed by dental hospitals/clinics(31.6%) and laboratories(7.4%). In terms of research design, research studies accounted for 88.5%, and experimental studies accounted for 11.5%. Research studies were far more prevalent. Concerning themes, there were 76 kinds of concepts that the studies dealt with, and the most dominant concepts were oral health awareness and behavior, which 34 studies focused on(9.6%). 10 studies or more were concerned with dental service, oral health status, dental hygiene education, infection control, oral health education, job satisfaction and stress. As to data analysis methods, frequency analysis was most dominant, followed by Chi-square test, t-test, analysis of variance, descriptive statistics, correlation analysis and regression analysis. Most of the studies made use of quantitative research methods. Conclusions : The effort by this study to analyze the papers included in the Journal of the Korean Society of Dental Hygiene to grasp research trends in the field of dental hygiene is expected to be of some use for the determination of the right directions of dental hygiene research in the future.

• Journal of Korean society of Dental Hygiene
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• v.9 no.2
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• pp.25-43
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• 2009

The purpose of this study was to examine the periodontal care of dental clinic patients. The subjects in this study were 213 patients who visited four different dental clinics in the region of Geoje. After a survey was conducted, the following findings were given: 1. In regard to the prevention of periodontal diseases, 52.1 percent of the patients investigated received treatment at a dental clinic when their gums were swollen or bleeding, and the way they responded to their swollen or bleeding gums was significantly different according to age, occupation(p<.01) and academic credential(p<.001). 31.0 percent got their teeth scaled to take care of their gums, and how to take care of the gums differed significantly with age, occupation, academic background(p<.001) and monthly income(p<.01). As to yearly preventive treatment frequency for periodontal diseases, 22.5 percent received treatment to prevent any possible periodontal diseases once a year, and age, educational background(p<.01) and occupation(p<.05) made a significant difference to that. By occupation, the company employees received more preventive treatment. As many as 66.7 percent intended to receive education on the prevention of periodontal diseases if there would be any chance, and gender and age(p<.001) made a significant differences to that. 2. As for oral health care habits, 52.1 percent brushed their teeth in a mixed way, up and down and right and left, and the women did that up and down more than the men. Those who were in their 30s did toothbrushing in the mixed way the most, and gender(p<.05), age(p<.05) and academic credential(p<.001) made a significant difference to that. Concerning daily mean toothbrushing frequency, 43.7 percent did that three times a day, and the women who did that three times outnumbered the men who did. The daily mean toothbrushing frequency varied significantly with gender(p<.01). By occupation and education, the professionals and better educated patients were significantly different from the others in that regard(p<.01). As to the use of an interdental brush, 57.3 percent had ever used it, and those who were better educated, who had a larger monthly income(p<01) and who were professionals(p<.001) were significantly different from their counterparts in that aspect. As to scaling experience, as many as 68.5 percent had ever had their teeth scaled, and those who were in their 30s had done that the most. Age made a significant difference to that(p<.01), and the professionals, larger income earners and better educated patients were significantly different from their counterparts in that regard(p<.001). The findings of the study justified the necessity and importance of periodontal care, and the prevention of periodontal diseases, regular dental checkup and the development of oral health education programs were required.

• Korean Journal of Environmental Agriculture
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• v.1 no.1
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• pp.31-38
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• 1982

The water quality at the Nakdong River stream was surveyed for 3 years from 1978 to 1980 at quarterly intervals of January, April, June and October at 12 sites along the main stream from Sangju to Imhaejin and at 2 sites of Geumho and Nam River tributaries. The overall results are summarized as follows: 1) The levels of dissolved oxygen in the Geumho River tributary on the basis of three-year average were 0.7 ppm in January, 1.3 ppm in April, 4.0 ppm in July and 0.8 ppm in October. BOD concentrations in the same period were 91 ppm in January, 37 ppm in April, 6 ppm in July and 24 ppm in October. The water of Geumho River was so highly contaminated that the water seems to be unsuitable for any type of water use. 2) The relatively clean water in the upstream of the main Nakdong River was rapidly polluted by the highly contaminated water of Geumho tributary. That is, dissolved oxygen and BOD at Hwawon site right after junction of the tributary were 10.4, 8.8 ppm in January, 5.8, 6.5 ppm in April, 6.3, 3.2 ppm in July and 7.0, 5.3 ppm in October, respectively. The values of turbidity, ammoniacal nitrogen and electrical conductivity were also observed to be quite high.