• Asian Pacific Journal of Cancer Prevention
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• v.16 no.1
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• pp.87-90
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• 2015

Alterations in mitochondrial DNA (mtDNA) have been studied in various cancers. However, the clinical value of mtDNA copy number (mtCN) alterations in gastric cancer (GC) is poorly understood. In the present study, we investigated whether alterations in mtCNs might be associated with clinicopathological parameters in GC cases. mtCN was measured in 109 patients with GC by quantitative real-time PCR. Then, correlations with clinicopathological characteristics were analyzed. mtCN was elevated in 64.2% of GC tissues compared with paired, adjacent, non-cancerous tissue. However, the observed alterations in mtCN were not associated with any clinicopathological characteristics, including age, gender, TN stage, Lauren classification, lymph node metastasis, and depth of invasion. Moreover, Kaplan-Meier survival curves revealed that mtCN was not significantly associated with the survival of GC patients. In this study, we demonstrated that mtCN was not a significant marker for predicting clinical characteristics or prognosis in GC.

• International Journal of Fluid Machinery and Systems
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• v.9 no.2
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• pp.160-168
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• 2016

In high speed turbopumps, cavitation occurs and often causes the flow instabilities such as cavitation surge and rotating cavitation. The occurrence of these cavitation instabilities is considered to relate to dynamic characteristics of the cavitation, which are modelled using a cavitation compliance and a mass flow gain factor. Various types of cavitation such as a blade surface cavitation, a tip leakage vortex cavitation, and a backflow vortex cavitation occur at the same time in the inducer and the dynamic characteristics of each cavitation have not been clarified yet in experiments. Focusing on the blade surface cavitation as one of fundamental cavitation, we investigated the dynamic characteristics of the blade surface cavitation on a flat plate hydrofoil in experiments in the present study.

• International Journal of Fluid Machinery and Systems
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• v.10 no.3
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• pp.307-317
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• 2017

In liquid-propellant rockets, POGO instability can occur, in which a fluctuation of propellant supply to the engine, a thrust fluctuation, and a structural vibration are coupled. For the prediction of this instability, it is required to provide dynamic characteristics of the pump represented as the transfer matrix correlating the upstream and downstream pressure and flow rate fluctuations. In the present study, the flow rate fluctuation is evaluated from the fluctuation of pressure difference at the different locations assuming that the fluctuation is caused by the inertia of the flow rate fluctuation. The experiments were performed in some flow conditions, and it was shown that the tendencies of dynamic characteristics are related to excitation frequencies, cavitation numbers and flow rate coefficients.

• Research in Mathematical Education
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• v.15 no.2
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• pp.105-114
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• 2011

During the 20th century, the secondary school mathematics teaching in China had been developing from the an old-style private school form with individual instruction to classroom teaching with Chinese characteristics, which experienced three stages of development; the stage for the formation of modern teaching system (1902-1949), the stage for development (1950-1976), and the stage for innovation (1977-2000). The characteristics and journey for the transformation will exert great for reference and effects for the reform of secondary school mathematics teaching nowadays.

• The Journal of the Korea Contents Association
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• v.11 no.12
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• pp.774-784
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• 2011

The purpose of this study, which was conducted as a part of investigations for vitalizing the School Sheriff system proposed as a means to prevent school violence and promote school safety, was to survey recognition of elementary school parents toward the School Sheriff system and present an improvement scheme for the system. For the study, we selected as the research object a set of parents whose children attended schools with School Sheriffs and then sampled 200 parents out of them with cluster random sampling, before analyzing 189 finally. Validity of the questionnaire is verified by expert council and factorial analysis, and reliability by reliability analysis. Statistical means including chi-square test, t-test and F-test are used. The result of the study as follows : First, necessity of the School Sheriff system varies by individual characteristics. Second, recognition toward the system itself varies by individual characteristics. Third, recognition toward the role that should be played by School Sheriffs varies by individual characteristics. Fourth, there is a difference in perceiving the role and activity of School Sheriffs, Fifth, whether the system helped improving school safety varies by individual characteristics. Sixth, the satisfaction from the School Sheriffs.

• Journal of the Korean Society of School Health
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• v.30 no.1
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• pp.48-58
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• 2017

Purpose: The purpose of this study was to identify the factors associated with energy drink consumption in Korean high school students. Methods: This cross sectional study used the secondary data from the 2015 Adolescent Health Behavior Online Survey. A total of 33,744 high school students were included in the study. Energy drink consumption was measured by asking how often they consumed energy drink during the previous week. Associated factors were categorized into socio-demographic characteristics, psychological characteristics, and health related behavioral characteristics. Complex samples logistic regression was used to analyze the influence of associated factors on energy drink consumption. Results: For socio-demographic characteristics, adolescent boys were likely to consume more energy drink than adolescent girls (Adjusted Odds Ratio [AOR]: 1.351, 95% Confidence Interval [CI]: 1.209~1.510). For psychological characteristics, depressed adolescents were likely to consume more energy drink than their counterparts (AOR: 1.697, 95% CI: 1.537~1.874). For health related behavioral characteristics, cigarette smoking (AOR: 1.336, 95% CI: 1.168~1.528), alcohol drinking (AOR: 1.126, 95% CI: 1.012~1.254), soda drink consumption (AOR: 1.800, 95% CI: 1.565~2.071), sweet drink consumption (AOR: 1.715, 95% CI: 1.431~2.054), and insufficient sleep time a day (AOR: 1.307, 95% CI: 1.197~1.427) were associated with energy drink consumption. Conclusions: In conclusion, energy drink consumption in Korean high school students were associated with such factors as psychological factors (depression) and health related behavioral characteristics (smoking, alcohol, sleep, soda and sweet drink). Thus, intervention programs in schools and communities should focus on these psychological and health related behavioral characteristics.

• The Journal of Korean Society for School & Community Health Education
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• v.11 no.2
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• pp.29-42
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• 2010

Objectives: This study was conducted to examine the relations of 'self-body evaluation', self-esteem, and health behavior among junior high school girls, analysing influencing factors for their health behavior, and building a base for its improvement. Methods: Data collection was conducted by self-report survey. Survey participants were 330 junior high school girl students in the area of Seoul, 221 from women's junior high schools and 109, coed schools. Survey included general characteristics, self-body evaluation, self-esteem, and health behavior. Results: 1. In their self-body evaluation, the students gave themselves $3.27{\pm}.53$ scores of the total 5, and of general characteristics, BMI, ideal BMI, personality, living standard were statistically significant different. 2. The scores for the girl students' health behavior were $2.77{\pm}0.37$ of total 4, and of general characteristics, school forms, grades, living standard were statistically significant different. characteristics, school forms, personality, school grades, living standard were statistically significant different. 3. The girls' self-body evaluation and self-esteem showed a low level of negative significant difference and their self-body evaluation and health behavior were significantly different, but a low level of negative significant difference. And the relationship between self-esteem and health behavior showed a high level of positive significant difference. 4. Influencing factors for the girls' health behavior showed a significant difference in self-esteem and school forms of general characteristics, self-body evaluation, and self-esteem.

• Journal of the Korean Society of School Health
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• v.25 no.2
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• pp.168-174
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• 2012

Purpose: The purpose of this study was to identify the prevalence of counselling need for school life problem in middle school students and to investigate characteristics of their family and school life. Methods: Subjects were 7,136 middle school students in Seoul. Data were from 2010 Student Health Examination in Seoul. Cross-sectional study using secondary data was performed. Descriptive, t-test and multiple logistic regression were conducted. Results: 7.2% among subjects required counselling for their school life problem. By demographics, the odds ratios of counselling need were 2.2 times in female, and 1.59 and 1.41 times in 8th and 9th grade vs 7th grade. By region, those of Dongbukbu (Northeast), Seobu (West), and Jungbu (Central) vs Kangnam (South of River) district were 0.46, 0.25, and 0.57 times. With regard to family and school life characteristics, those of inflicted violence, the bullying, family apprehension, and consideration of away from home were 3.38, 3.75, 2.08, and 2.40 times, while that of students having person to discuss was only 0.62 times. Conclusion: It is necessary to activate the school counselling program, especially enforcing support system, not only to enforce resilience of student, but also to decrease the health problems in family and school life.

• The Korean Journal of Community Living Science
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• v.25 no.3
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• pp.289-301
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• 2014

Recent years have witnessed an increasing number of alternative school students in Korea. However, few studies have empirically examined these students' school adjustment and peer relationship skills. To address this gap in the literature, this study examines the effects of individual characteristics, family characteristics and peer relationship skills on these students' school adjustment. Four aspects of school adjustment were measured as dependent variables. These four aspects included peer relationship adjustment, relationships with teachers, school environment adjustment, and schoolwork attitude adjustment. The peer relationship skills included three components, namely initiative, mutual closeness, and order awareness. Data were collected from 323 alternative middle and high school students through a structured questionnaire. The statistical analysis methods included descriptive statistics and a hierarchical regression analysis using SPSS WIN 19.0. According to the results, peer relationship skills as well as family background characteristics, including the age of the father, the education level of the father, the family economic level, and the number of close family members, had significant effects on school adjustment. The results highlight the importance of peer relationship skills for these students' successful school adjustment and have important policy and theoretical implications.

• International Journal of Internet, Broadcasting and Communication
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• v.16 no.1
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• pp.191-202
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• 2024

Self-efficacy is a major factor related to performance and needs to be improved in business and education field. This study explains the effectiveness of school career assistance to improve college students' self-efficacy. Furthermore, it demonstrates the moderating effects of grit and regulatory focus (promote and prevention). School career assistance is based on group support, and moderating variables in this paper are individual characteristics. In these group and individual dimensions, if the effectiveness of school career assistance varies depending on individual characteristics, schools will be able to establish self-efficacy improvement strategies more appropriate for individual students. School would understand individual characteristics such as grit and regulatory focus, then could make individual strategy for enhancing self-efficacy and performance. Hence, it is expected that the performance of school and student will improve through the self-efficacy improvement plan presented in this study.