• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2004년도 제22회 춘계학술대회논문집
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• pp.85-92
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• 2004

As a research to develop a SCRAM jet engine is actively conducted, a necessity to produce a high-enthalpy flow in a laboratory is increasing. In order to develop the SCRAM-jet engine, stabilized combustion in a supersonic flow-field should be attained, in which a duration time of flow is extremely short. Therefore, a mixing process of breathed air and fuel, which is injected into supersonic flow-fields is one of the most important problem. Since, the flow inside SCRAM jet engine has high-enthalpy, an experimental facility is required to produce such high-enthalpy flow-field. In this study, a detonation-driven shock tunnel was built and was used to produce high-enthalpy flow. Further-more, SCRAM jet engine model equipped backward-facing step was installed at test section and flow-fields were visualized using color-schlieren technique and high speed video camera. The fuel was injected perpendicular to the flow of Mach number three behind backward-facing step. The height of the step, distance of injection and injection pressure were changed to investigate the effects of step on a mixing characteristic between air and fuel. The schlieren photograph and pressure histories show that the fuel was ignited behind the step.

• 공학교육연구
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• 제18권1호
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• pp.61-73
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• 2015

이 연구의 목적은 공학교육의 질 개선을 위해서는 학생들의 학습과정에 대한 분석이 함께 이루어져야 한다는 가정 아래, 공과대학생들의 학습과정을 분석하고 이를 통해 학습지원의 방향을 탐색하는 것이다. 학습과정 분석은 다섯 가지 영역-수업내활동, 수업외활동, 상호작용, 학습성과, 학습지원체제-으로 이루어졌으며, 수도권에 위치한 S대학의 공과대학생들을 대상으로 설문 조사를 하였다. T-test, Anova, 위계적선형모형을 활용한 회귀분석을 활용하였다. 연구 결과 전공과 교양 수업 만족도는 높았으나, 자기주도적 학습활동이나 교수와의 상호작용은 낮았으며, 고등사고력 활동에 많이 참여하고 있지 않았고 학습성과 역시 낮았다. 학습성과에 중요한 영향을 미치는 요인은 교수와의 상호작용, 고등사고력 활동, 수업에의 적극적인 참여였다. 이러한 결과를 토대로 고등교육의 질 개선을 위해 수업에의 적극적 참여와 고등사고력 활동을 강조하고 글쓰기 지원 및 교수-학생간 상호작용 활성화 등을 제안하였다.

• 한국콘텐츠학회논문지
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• 제10권12호
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• pp.397-405
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• 2010

본 연구의 목적은 학생운동선수들의 자기관리와 스포츠 대처관계를 규명하는데 있다. 이를 위하여 대한 체육회에 등록된 서울, 인천 학생운동선수 446명을 대상으로 전국체육대회 참가 전 질문지를 이용하여 자료수집을 실시하였다. 자료수집을 위해 사용된 조사도구로는 운동선수 자기관리행동 질문지와 스포츠 대처척도 질문지를 사용하였다. 수집된 자료는 SPSS 17.0을 이용하여 연구목적에 따라 t-검정, 요인분석, 중다회귀분석을 실시하였다. 이를 통해 얻어진 결론은 다음과 같다. 첫째 학교급 간 자기관리와 스포츠대처행동에서 차이가 있었으며 대체로 대학선수가 높은 것으로 나타났다. 둘째 운동경력에 따른 자기관리와 스포츠대처행동은 운동경력이 높을수록 고유행동, 몸관리, 문제중심적 대처 능력이 높은 것으로 나타났다. 셋째 학생운동선수의 자기관리와 스포츠 대처행동의 관계는 회피를 제외한 나머지 요인에서 정적 상관관계가 나타났으며, 문제중심적 대처가 정신력, 고유행동관리, 훈련관리, 몸관리로부터 영향을 받고, 정서중심적 대처는 정신력관리, 생활관리, 고유행동관리, 훈련관리로부터 영향을 받았다. 이외에 생활관리가 초연에 영향을 끼치고, 정신력, 고유행동관리, 몸관리가 회피에 영향을 끼치고 있었다.

• Korean journal of medical education
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• 제30권4호
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• pp.339-346
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• 2018

Purpose: The purpose of this study was to examine whether non-cognitive student attributes such as learning style and personality type affected academic performance in a flipped learning classroom of a pre-dental undergraduate science course. Methods: 'Biodiversity and Global Environment,' a 15-week, 3-credit course, was designed as a flipped class in Seoul National University School of Dentistry in 2017. Second-year pre-dental students were required to enroll in the course and to engage in online learning and in-class discussion. The Kolb's Learning Style Inventory and the Myers-Briggs Type Indicator were conducted to measure non-cognitive student factors. Independent samples t-test and multivariate regression analyses were used to examine the relationships between self-rated measurements and academic achievement. Results: More than half of the students enrolled in the flipped science course had an assimilator learning style (50%), followed by convergers (24%), accommodators (16%), and divergers (10%), and their personality types were dominated by the introverted, sensing, thinking, and judging types, respectively. Examining group differences using the t-test demonstrated a significant relationship between the diverger group and higher academic success. In particular, the multivariate regression analysis indicated that both thinking types and female students performed better in discussion than feeling types and male students. Conclusion: To operate the flipped learning classroom more effectively in medical and dental education, the instructor should carefully develop and apply a more tailored facilitation and relevant assessment by considering student learning styles and personality types.

• 한국초등과학교육학회지:초등과학교육
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• 제31권2호
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• pp.188-196
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• 2012

Science festivals have occupied a very important axle in informal science education that enables students to experience the amazement of scientific experiments to think over scientific principals beyond the formal education in the classrooms. Among the concerned person, the most benefit-taken group may be the assistant who help the participants experience the activities in the festival. In order to find out the ways to make the student assistant's participation into a meaningful education experience, we analyzed the types of the activities in the science festival as well as the characteristics of the interaction between the student-assistants and the participating students are studied. The research findings are as follows: First, most activities in the science festival had related to the scientific concepts or principals; however, the understanding of the concepts and principals didn't highly affect the procedure of the activities. In many cases the students operated and made results without checking the related concepts or principals. Second, the student-assistants showed the consistency of operation in guiding their activities. They were explaining mainly the process of the experiments without giving a chance to think of related concepts or principles. We suggest that teacher should consider the student-assistants' learning in the festival as well as that of the participants.

• 보건의료산업학회지
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• 제12권1호
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• pp.149-160
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• 2018

Objectives : The purpose of this study was to examine the mediating effect of professional self-concept on the relationship between professor-student interaction and job-seeking anxiety among nursing students. Methods : A cross-sectional survey was conducted using a convenient sampling method with data collected from a sample of 294 nursing students. The structured questionnaire included items to assess job-seeking anxiety, professional self-concept, and professor-student interaction among nursing students. The data were analyzed with descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, and multiple regression using the SPSS 24.0 program. Mediation analysis was performed according to the Sobel test. Results : Analysis of the mediating effect of professional self-concept showed a significant mediating influence of professional self-concept on the relationship between professor-student interaction and job-seeking anxiety. Conclusion : The findings suggest that professional self-concept may play a role in increasing the effect of professor-student interaction on job-seeking anxiety. Therefore, this study underscores the need to consider ways of enhancing professional self-concept during interventions for nursing students.

• International Journal of Contents
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• 제17권2호
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• pp.65-76
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• 2021

The aim of this study was to explore the use of Google Classroom as a learning management system for College English. The study targeted 34 university students. They took part in various activities, such as writing reactions to video lectures, peer-editing essays, and recording video presentations, et cetera. For the study, a t-test was conducted to evaluate the English development of the students. The two essays that each student wrote were used as the data sources. The result (t=-5.854, p=.000) indicated an improvement in their English writing proficiency. In addition, a survey was conducted to gather students' feedback regarding their perceptions towards the course. The study covered five aspects of their experience: Google Classroom, language development, Quizlet, classroom experience, and essay-writing experience. From the results, students indicated a positive response to the program. The use of Google Classroom in an online learning setting accomplishes two things; it helped the students in the development of their English proficiency, and provided activities that students find interesting, which in turn stimulates their self-learning spirit.

• 대한의생명과학회지
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• 제13권1호
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• pp.55-60
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• 2007

Computerized image processing and analysis system was used for quantitative assessment of skin tissue components in color histological sections. The purpose of this study was to determine that the changes in the collagen fiber density and elastic fiber density in dermis in the rat skin as aging. And also to determine that the correlation between fibroblast density and collagen fiber density and elastic fiber density in the aged rat skin. Ten weeks old ($130{\sim}150g$) eight and fifty-four weeks old ($300{\sim}350g$) eight female Sprague-Dawley rats were used. The full-thickness skin biopsy specimens were prepared serial sections and stained with hematoxylin and eosin, Masson's trichrome and Verhoeff-van Gieson. The collagen fiber and the elastic fiber were identified using the image analysis processing system and then calculated the collagen fiber density rate and the elastic fiber density rate in the dermis. It also identified fibroblast and calculated fibroblast density in the dermis. By using a Student's t-test, a decrease in the collagen fiber density rate (t=-4.650, P<0.001) and the elastic fiber density rate (t=-6.494, P<0.001) of dermis can be observed in aged rats as compared with the young rats. A Student's t-test showed a significantly less fibroblast density in the aged rats than the young rats (t=-4.497, P<0.001). There were significantly positive correlation between the fibroblast density and the collagen fiber density rate (r=.69, P<0.001) and the elastic fiber density rate (r=.91, P<0.001). These results indicate that the aging may decrease the collagen fiber density and elastic fiber density due to reduced the proliferative and synthetic activity of fibroblast in the dermis.

• 한국의상디자인학회지
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• 제4권1호
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• pp.155-172
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• 2002

The purposes of the study were to investigate the differences of image on male and female contemporary folk costume of college students according to their sex, major and contemporary folk costume‘s possession. The data were collected from 300 male and 313 female college students in Cheongju city through self-administerd questionnaires and were analyzed by frequencies, Cronbach’s α, F-test, t-test, one way ANOVA and Duncan Test. The results of the study were as follows: There were significant differences with the images on male and female contemporary folk costume according to student‘s sex. There were significant differences with the images on male and female contemporary folk costume according to student’s major. There were significantly different with the images on male and female contemporary folk costume between group of having a contemporary folk costume and group of non-having it.

• 가족자원경영과 정책
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• 제4권2호
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• pp.31-44
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• 2000

In this study, we compare and analysis the family rite consciousness and it’s actual conditions between yanbian university students who have lived in different culture and political system from Korean students. Total 645 Yanbian and Korean student’s data was collected in Jun 1998. Statistics methods, Cronbach’α, Frequency, Percentage, $x^2$, t-test are used to analyse the data. The result are follows. First, in view of overall rite conditions, Korean students show more traditional tendency than Yanbian students. Second, in view of ritual process which is sub-domain of overall ritual consciousness Yanbian student keep more traditional attitude than Korean students. Third, Koran students’s score which presents the need of education of rite is higher than that of Yanbian students’s