• Korean Journal of Mathematics
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• v.22 no.1
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• pp.133-138
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• 2014

We show that a compact immersed annular Bryant surface in $\mathbb{H}^3$ meeting two parallel horospheres in constant contact an gles is rotational.

• Korean Journal of Mathematics
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• v.27 no.4
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• pp.1149-1157
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• 2019

We prove the Frenet type formulae for smooth one-parameter family of 2-planes or 3-planes in the Lorentz-Minkowski space 𝕃⁶. We consider two cases separately: the planes are spacelike or the planes are timelike.

• Journal of Acupuncture Research
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• v.36 no.3
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• pp.131-139
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• 2019

Background: This study aimed to investigate the correlation between heat transmission and intervention factors for warm acupuncture (such as features of acupuncture material and moxa, the treatment method, and clinical symptoms). Methods: Korean, English, Chinese and Japanese databases were analysed. Experimental studies that explored the association between thermal stimulation delivery and warm acupuncture intervention factors were included. The peak temperature, time to reach the peak temperature, and time of the effective stimulus, were set as the major parameters and analysed. Results: A total of 12 studies were included. Two studies were associated with the acupuncture needle material, 4 studies associated with the moxa mass, 1 study associated with the moxa density, 2 studies associated with the location of ignition, and 1 study associated with treatment environment were reviewed. The reporting quality of the 12 studies was low. Conclusion: This study provided limited information because of the heterogeneity of materials and parameters depending on each experiment. Further studies should clarify the correlation between heat transmission and intervention factors for warm acupuncture.

• Journal of The Korean Society of Integrative Medicine
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• v.8 no.1
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• pp.77-86
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• 2020

Purpose : This study is a descriptive survey research that examines the effect of nursing students' satisfaction in major and consciousness of biomedical ethics on nursing professionalism. Methods : The research subjects consisted of junior and senior nursing students enrolled in four colleges located in City B, South Korea Structured questionnaires were distributed to the subject and a total of 262 copies of survey responses were analyzed. The collected data were analyzed by frequency, percentage, mean and standard deviation, t-test, and analysis of variance (ANOVA) using SPSS/WIN 22.0 program. The correlation relationship was investigated based on the Pearson correlation coefficient. Multiple regression was used to capture the effect on the nursing professionalism. Results : A positive correlation was observed between the nursing students satisfaction in major and consciousness of biomedical ethics (r=.280, p<.001), between satisfaction in major and nursing professionalism (r=.581, p<.001), and between consciousness of biomedical ethics and nursing professionalism (r=.290, p<.001). General satisfaction (β=.227, p=.001), and relationship satisfaction (β=.248, p=.000) among major satisfaction had the strongest prediction power for the nursing professionalism of nursing students, followed by right to life of fetus (β=.190, p=.000) among consciousness of biomedical ethics and motivation for admission (β=.137, p=.006). These predictors explained 36.9 % of the variable of nursing professionalism. Conclusion : Based on this study result, repeated studies are required that can confirm diverse influential factors on the nursing professionalism of nursing students. Operation of curriculums and development of programs that increase the nursing students' satisfaction in major and foster their nursing professionalism are required in the future.

• Journal of Korean Public Health Nursing
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• v.32 no.2
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• pp.263-274
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• 2018

Purpose: This study examined the correlation of insomnia, sleep quality, depression, and circadian rhythm in nursing students. Methods: A total of 213 subjects completed a questionnaire consisting of their general characteristics, Insomnia Severity Index (ISI), Pittsburgh Sleep Quality Index (PSQI), Center for Epidemiologic Studies Depression (CES-D), and Composite Scale of Morningness (CSM). The collected data were analyzed by descriptive statistics, t-test, ANOVA, and Pearson's correlation coefficient using the SPSS 23.0 program. Results: The subjects' mean scores were ISI 7.18; PSQI 11.18; CES-D 16.00; and CSM 30.18. In insomnia, there were significant differences according to caffeine, perceived health status and major satisfaction. In sleep quality, there were significant differences according to perceived health status and major satisfaction. Significant differences in depression were observed according to gender, caffeine, subjective health status, major satisfaction, and circadian rhythm by drinking and exercise. A significant positive correlation was observed among ISI, PSQI, and CES-D. ISI and CES-D were negatively correlated. Conclusion: Tailored health care programs should be developed and applied to prevent and manage sleep-related and emotion-related problems in nursing students by considering the health status, major satisfaction, and gender.

• Journal of Korean Society of Transportation
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• v.21 no.5
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• pp.7-18
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• 2003

Due to the changes of shipping and logistic environment, Asian ports today face severe competition. To be a mega-hub port, Asian ports have achieved a big scale development. For these reasons, it has been widely recognized as an important study to analyze and evaluate characteristics of Asian ports, from the standpoint of Korea where Busan Port is located. Although some previous studies have been reported, most of them have been beyond the scope of Asian ports and analyzed the world's major ports; moreover, the studied ports have been about the ports which are well known from the previous research and reports. So, most studies is unlikely to be used as substantial indicators from the perspective of Busan Port. In addition. most of the existing studies have used hierarchical evaluation algorithm for port ranking, such as AHP (analytical hierarchy process) and clustering analysis. However, these two methods have fundamental weaknesses from the algorithm perspective. The aim of this study is to classify major Asian ports based on competitiveness level. Especially. in order to overcome serious problem of the existing studies, major Asian ports were analyzed by using objective indicators. and Fuzzy C-Means algorithm, which alleviates the weakness of the clustering method. It was found that 10 ports of 16 major Asian ports have their own phases and were classified into 4 port groups. This result implies that some ports have higher potential as ports to lead some zones in Asia. Based on those results. present status and future direction of Busan port were discussed as well.

• Journal of the Korea Society for Simulation
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• v.29 no.4
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• pp.55-64
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• 2020

Since the European Union-South Korea Free Trade Agreement entered into force in 2011, the Korean automobile market has grown rapidly, resulting in intensifying competition among companies in the market. European automakers gained price competitiveness, which intensified competition with Korean automakers. In such a situation, various studies on the Korean automobile market have been conducted, but studies such as market influencing factor analysis and consumer analysis have mainly been conducted, and there is no research on the analysis of competitive dynamics in the market. In this study, the competitive dynamics between Hyundai Motors, Kia Motors, Mercedes-Benz, and BMW, which are major automakers in the Korean automobile market, are analyzed. The competitive relationship between major automakers are modeled using the Lotka-Volterra (LV) model and the competitive dynamics over time are analyzed by applying the Moving Window. In order to explain the competitive dynamics effectively, we analyze it by subdividing it based on various influencing factors.

• Korean Journal of Human Ecology
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• v.23 no.6
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• pp.1013-1033
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• 2014

This study attempted to develop a valid and reliable instrument capable of measuring Korea midlife family resilience (The Korea Midlife Family Resilience Scale: KMFRS). An exploratory, non-experimental, cross-sectional, and quantitative design was used to develop and validate the KMFRS. A tentative factor structure of family resilience and an item pool of the scale were constructed through a comprehensive literature review and personal interview. The pilot study was conducted with 424 middle aged adults(40~59) to select items for a scale, resulting in a preliminary scale composed of 70 items. In the main study, the preliminary scale was administered to a national representative sample of 562 middle-aged Korean adults. The scale was filtered into 40 items by the item analysis and an exploratory factor analysis, resulting in 6 factors: Family Connectedness & Problem Solving, Family's Positive Perception of Adversity, Family's Economic Stability, Family Religion & Spirituality, Support of Extended Family, and Support of Friends & Neighbors. These 6 factors explained 61.82% of total variance. The findings of the current study indicate substantial support for the reliability and the validity of the KMFRS. Other challenges and suggestions for future research on family resilience scale are discussed.

• Research in Community and Public Health Nursing
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• v.21 no.1
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• pp.53-62
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• 2010

Purpose: The purpose of this study was to analyze the contents and trends of smoking and smoking cessation of adolescents in Korea. Methods: The subjects were 315 researches from 1997 to 2008 in Korea. They were examined in terms of subjects, research design, key words, types of intervention, times of intervention, and dependent variables for experimental research, and in terms of subjects, concepts, research questions and research methods for qualitative research. Results: Of the studies 52.4% were master's theses, and 22.9% of the subjects were male high school students. The most common research design was descriptive design. Major concepts studied were related to emotional cognitive variables. Among 80 experimental researches, 70% were about smoking cessation programs. The number of qualitative studies was only 6. Their concepts were smoking experience, motives for smoking cessation, smoking process, and motives for smoking. A major research question was: What does smoking mean to adolescents? Conclusion: More research should be done for the female students' smoking and smoking cessation. Also, research that adapts educational programs for smoking and smoking cessation needs to be performed through at least a 10 times longer period and in regular basis to get desirable results.

• Management & Information Systems Review
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• v.3
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• pp.353-398
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• 1999

In the more than one decade, studies of organizational citizenship behavior(OCB) have increased continuously, research on the role of job satisfaction and organizational commitment upon the relationships between OCB and Job characteristics, however, is very scarce. This study analyzed comprehensively existing studies of OCB, designed a model of mediating role of behavioral performance(job satisfaction, organizational commitment), and generated three hypotheses inherent in the model. To design the model and generate the hypotheses, this study conducted a comprehensive literature survey on OCB. To test the hypotheses, this study collected data from 847 employees at 12 large general hospitals in Pusan area through a questionnaire survey and conducted the three step mediated regression analysis using the SAS-PC Package. Conclusively, job characteristics tend to be the most influential antecedents affecting not only through mediating factors but also directing to OCB. These and other major findings from this study imply that existing American studies may be applicable the Korean organizations and that this study may complement the deficiencies of the existing studies.