• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
• /
• pp.513-514
• /
• 2005

In plasma processing reactors, it is common practice to control plasma density and ion bombardment energy by manipulating excitation voltage and frequency. In this paper, a dually excited capacitively coupled rf plasma reactor is self-consistently simulated with a three moment model. Effects of phase differences between primary and secondary voltage waves, simultaneously modulated at various combination of commensurate frequencies, on plasma properties are investigated. The simulation results show that plasma potential and density as well as primary self-dc bias are nearly unaffected by the phase lag between the primary and the secondary voltage waves. The results also show that, with the secondary frequency substantially lower than the primary frequency, secondary self-dc bias remains constant regardless of the phase lag. As the secondary frequency approaches to the primary frequency, however, the secondary self-dc bias becomes greatly altered by the phase lag, and so does the ion bombardment energy at the secondary electrode. These results demonstrate that ion bombardment energy can be more carefully controlled through plasma simulation.

• Smart Structures and Systems
• /
• 제25권3호
• /
• pp.265-277
• /
• 2020

Recently, the concept of "drive-by" bridge monitoring system using indirect measurements from a passing vehicle to extract key parameters of a bridge has been rapidly developed. As one of the most key parameters of a bridge, the natural frequency has been successfully extracted theoretically and in practice using indirect measurements. The frequency of bridge is generally calculated applying Fast Fourier Transform (FFT) directly. However, it has been demonstrated that with the increase in vehicle velocity, the estimated frequency resolution of FFT will be very low causing a great extracted error. Moreover, because of the low frequency resolution, it is hard to detect the frequency drop caused by any damages or degradation of the bridge structural integrity. This paper will introduce a new technique of bridge frequency extraction based on Hilbert Transform (HT) that is not restricted to frequency resolution and can, therefore, improve identification accuracy. In this paper, deriving from the vehicle response, the closed-form solution associated with bridge frequency removing the effect of vehicle velocity is discussed in the analytical study. Then a numerical Vehicle-Bridge Interaction (VBI) model with a quarter car model is adopted to demonstrate the proposed approach. Finally, factors that affect the proposed approach are studied, including vehicle velocity, signal noise, and road roughness profile.

• Structural Engineering and Mechanics
• /
• 제17권3_4호
• /
• pp.281-290
• /
• 2004

A review of current procedures being used in engineering practice to analyze the response of structure/foundation systems subjected separately to different types of dynamic excitation, such as earthquake, sea-wave action, wind, or moving wheel loads, is presented. Separate formulations are given for analyzing systems in the time and frequency domains. Both deterministic and stochastic forms of excitation are treated. A distinction is made between demand and capacity analyses.

• 한국임상보건과학회지
• /
• 제5권1호
• /
• pp.825-833
• /
• 2017

Purpose .This study aims to assess the influence factors on the level of satisfaction with hospital training and to provide basic data for more efficient hospital practice of students' public health administration . Methods . We have conducted a survey on students satisfaction with their hands on practice against 200 students in Busan, Kyeongnam and Kyungbook area, who have completed their practice in public health administration. We have identified the general characteristics of the target respondents, the current training status of the department for the hospital practice and training venue; also analyzed the characteristics composed of the apprentice student's attitude before the practice, satisfaction with the department training program and hospital for practice, as well as their practice at hospital. The general characteristics of the target respondents and clinic practice status at the hospital were measured in percentage and frequency analysis; the average and standard deviations of hospital size were also measured; and the correlations between satisfaction with the department, attitude towards the practice and satisfaction with the hospital were analyzed. Results . Most public health administration students experienced their practice at the hospital after the first semester on the $2^{nd}$year and they have received the foundation training for the practice. The survey allowed multiple responses and the results are as follows: medical terminology 49.5%, medical coordinator 36.7%, Hospital administration 26.5%, Health insurance 17.3%, and medical recording and practice 13.8% respectively. In terms of each individual student's attitude towards the practice at the hospital, the respondents answered as follows: I have completed the obligatory subjects for the practice before the practice 89.5%; I have been fully informed on the hospital for my practice. 74.5%; I responsibly practiced and worked with professionalism and sense of belonging to the hospital as a member of staff 90%; I have actively learned and adopted 95%; My knowledge and skills from the practice was relevant to the theory and practice from my course 83.5%. The findings of satisfaction by size of hospital were in order of a small clinic($3.24{\pm}0.63$), medium sized clinic($3.27{\pm}0.65$), hospital ($3.20{\pm}0.61$), and large sized comprehensive hospital ($2.93{\pm}0.74$). Consequently the satisfaction rate shows no significant difference by size of hospital. In relations between practice attitude and satisfaction with subject, the matter of acquiring information and fully understanding of the hospital for practice before practice(p=0.04), the matter of a sense of belonging and responsibility at hospital during practice(p=0.33). the matter of active adaptation attitude during practice (p=0.42), and the matter of correlations with school curriculum during practice(p=0.00) showed significant results. In relations between practice attitude and satisfaction with the hospital for practice, the matter of acquiring information and fully understanding of the hospital for practice before practice(p=0.01), the matter of a sense of belonging and responsibility at hospital during practice(p=0.04), and the matter of correlations with school curriculum during practice(p=0.00) showed significant results. Conclusion . The most essential subject for the practice in public health administration is medical terminology and there is no significance in satisfaction with the practice by size of hospital. Students were content with the hospital where they can experience as much as possible. Students content with their major show positive attitude towards the practice and so do those content with the hospital. Those with the positive attitude towards the practice show the high correlation of satisfaction with both the major and hospital. As a result, the satisfaction with the major is the significant attribute to the practice in the hospital.

• 가정과삶의질연구
• /
• 제26권3호
• /
• pp.131-147
• /
• 2008

The main purpose of this study is to examine the effects of the fathering practice on children's sociality. The subjects of this research are 569 (grade 6) students who are from 4 elementary schools, and 511 (grade 3) students who are from 4 other middle schools in Seoul and Gyeonggi province. The data was collected using two kinds of questionnaires: Canfield's (1995) Fathering Practice Scale and Urn Guy-Sung's (1999) Children's Sociality Scale. The data was analyzed by frequency, mean, standard deviation, percentage, Cronbach's alpha, t-test, one-way ANOVA, Scheffe's post hoc test, and hierarchical regression. The major results of this research are summarized as follows: First, there were differences in children's sociality according to children's and fathers' perceptions of the fathering practices. I classified 1080 students into 4 groups by mean${\pm}$1/2standard deviation of the children's and fathers' perceptions of the fathering practices. The results showed that children's sociality tends to be higher when the children's perceptions of the fathering practice are at a high level (Group 1 and Group 2), compared to when the fathers' perceptions of the fathering practice are at a high level (Group 3 and Group 4). Second, hierarchical regression was divided into two models so as to know how the effects were different from the children's and fathers' perceptions of the fathering practice on children's sociality. In the first model, only the fathers' variables were inputted and fathers' perceptions on fathering practice has significant effects on children's sociality. In the second model, both the children and fathers' variables were inputted into analysis. The fathers' perceptions of the fathering practice were not influenced, but children's perceptions of the fathering practice had great effects on children's sociality. Third, as the result of hierarchical regression with age, mid-childhood has significant effects on children's perceptions of the fathering practice on children's sociality. In addition, early adolescence is an important variable in the effects of the fathers' perceptions of the fathering practice on children's sociality. As a result the fathers' perceptions of the fathering practice are important and influential variables on children's sociality. In the result of this study fathering practice is necessary in children's development.

• 디지털융복합연구
• /
• 제18권7호
• /
• pp.279-287
• /
• 2020

본 연구는 효과적인 임상실습교육을 위하여 실습위주의 핵심실기역량강화 실습교과목 학습이 간호학생의 핵심역량과 임상실습만족도에 미치는 효과를 알아보기 위한 목적으로 수행하였다. 연구대상을 2주간 1일 8시간씩 네 영역의 핵심간호수기영역 교육을 실시한 그룹과 전통적인 강의중심 교육을 받은 그룹으로 나누고 15주간 임상실습 후 설문지를 작성하여 자가 보고하게 하였다. 수집한 자료는 SPSS 21.0프로그램을 사용하여 빈도와 백분율 및 평균과 표준편차, chi-square test, t-test로 분석하였다. 연구결과는 비판적사고성향과 임상실습만족도 부문의 가설은 지지되었으며 리더십, 문제해결능력 및 의사소통능력 부문의 가설은 기각되었다. 본 연구결과를 통하여 핵심실기역량강화 실습교육이 간호학생의 비판적사고성향과 임상실습만족도에 긍정적인 효과를 미치는 것으로 확인할 수 있었다. 따라서 간호교육에서 효과적인 실습교육 중재로 활용할 수 있을 것이다.

• 한국학교보건학회지
• /
• 제35권3호
• /
• pp.123-132
• /
• 2022

Purpose: The purpose of this study is to identify factors related to hand washing practice among adolescents before and after the outbreak of the COVID-19 pandemic. Methods: The study was conducted using data from the 15th~16th (2019~2020) Korea Youth Risk Behavior Web-based Survey, and the subjects of the study were 57,303 and 54,948 people who participated in the 2019 and 2020 study, respectively. The data were analyzed with frequency test, rao-scott 𝑥² test and multiple logistic regression analysis using SPSS 27.0. Results: Changes in the hand washing practice rate were observed before and after the COVID-19 pandemic in all five behaviors; before eating in school, after using the toilet in school, before eating at home, after using the toilet at home, and after returning home. The study found that the hand washing practice rate increased by 1.21-2.43 times after the COVID-19 pandemic. In addition, as a result of logistic regression analysis, the hand washing practice rate before and after the COVID-19 pandemic was related to gender, region, school grade, school type, economic status, health status, and personal hygiene education experience. Conclusion: This study confirmed the importance of hand washing education to improve the hand washing practice rate in adolescents. It is necessary to develop and apply an effective youth hand washing education program in consideration of various variables that appeared as significant factors influencing the hand washing practice rate before and after the COVID-19 pandemic.

• 여성건강간호학회지
• /
• 제26권1호
• /
• pp.61-71
• /
• 2020

Purpose: This study was conducted to investigate the effects of problem-based learning-integrative simulation practice (PBL-ISP) on nursing knowledge, critical thinking, problem-solving ability, and immersion among nursing students. Methods: The study used a nonequivalent control group post-test design. A PBL-ISP educational program was provided to the experimental group, and hands-on practice using a high-fidelity simulator (HFS) was administered to the control group. There were 42 subjects in the experimental group and 40 in the control group. Data were collected during the fall semester of 2019. Using SPSS for Windows version 23.0, data were analyzed in terms of frequency, percentage, mean, standard deviation, the chi-square test, t-test, and Pearson correlation coefficients. Results: Significant differences between the experimental and control groups were found in nursing knowledge (t=3.67, p<.001), critical thinking (t=3.40, p=.001), problem-solving ability (t=3.52, p=.001) and immersion (t=4.44, p<.001). Conclusion: PBL-ISP was more effective in improving nursing knowledge, critical thinking, problem-solving ability, and immersion than was hands-on practice using an HFS.

• 한국학교보건학회지
• /
• 제16권2호
• /
• pp.85-95
• /
• 2003

This paper surveys and researches primary school students' situation of their school life. The purpose of this paper is to propose the basic information of the accident prevention teaching and the safety management in order to avoid accidents to occur beforehand. We selected m primary students out of the six primary schools in Taebaek City at which the nursing students of Kangwon Tourism College practiced school health. We used SPSS Win for analyzing data. We carne up with the general characteristics and percentage using frequency analysis, mean and standard deviation of each item, the mean difference using T-Test, and the different factors using one-way analysis. The results are as follows: 1. The 6th grade students don't practice safety procedures than the 5th grade students during outside the school. The older the student is, the less it practices safety procedures. 2. Boys practice safety procedures better than the girls during inside and outside the school. 3. Hot -tempered students don't practice safety procedures properly. 4. Most of the students who often use the health room of the school have high scores in safety procedures test and as a result, these students practice safety procedures thoroughly. 5. The grade of safety living activity is the highest during gymnastic class. Next is when the students use the stairs when they are going up and clown. Then, the use of science room In the playground is the lowest grade of safety for living activity.

• 한국치위생학회지
• /
• 제13권6호
• /
• pp.961-967
• /
• 2013

Objectives : The purpose of this study is to establish the regular scaling checkup service and to improve oral health care on the basis of knowledge, attitude, and belief by Dental Prophylaxis Practice Lab in A university. Methods : Subjects were 324 patients who visited Dental Prophylaxis Practice Lab in A university for the preventive removal of tartar from April to June 8, 2012. Data were analyzed using SPSS version 18.0 through the frequency analysis, chi-test, and logistics regression analysis. Results : In relation to scaling experience by age, 65.3% had experienced scaling checkup and those between 20 to 29 (34.7%) did not receive the scaling therapy. Smokers tended to have received more scaling experience than nonsmokers. Second, the number of untreated dental caries and missing teeth due to dental caries were important because the variables of oral health condition affected the scaling experience. Conclusions : It is necessary to increase the scaling experience and regular dental checkup by providing the education to improve dental clinics visit based on the knowledge and belief towards the scaling.