• Advances in nano research
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• 제10권3호
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• pp.253-261
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• 2021

Polydimethylsiloxane (PDMS) is one of the most widely adopted silicon-based organic polymeric elastomers. Elastomeric nanostructures are normally required to accomplish an explicit mechanical role and correspondingly their mechanical properties are crucial to affect device and material performance. Despite its wide application, the mechanical properties of PDMS are yet fully understood. In particular, the time dependent mechanical response of PDMS has not been fully elucidated. Here, utilizing state-of-the-art PeakForce Quantitative Nanomechanical Mapping (PFQNM) together with Force Volume (FV) and Fast Force Volume (FFV), the elastic moduli of PDMS samples were assessed in a time-dependent fashion. Specifically, the acquisition frequency was discretely changed four orders of magnitude from 0.1 Hz up to 2 kHz. Careful calibrations were done. Force data were fitted with a linearized DMT contact mechanics model considering surface adhesion force. Increased Young's modulus was discovered with increasing acquisition frequency. It was measured 878 ± 274 kPa at 0.1 Hz and increased to 4586 ± 758 kPa at 2 kHz. The robust local probing of mechanical measurement as well as unprecedented high-resolution topography imaging open new avenues for quantitative nanomechanical mapping of soft polymers, and can be extended to soft biological systems.

• 한국정보통신학회논문지
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• 제21권7호
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• pp.1386-1392
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• 2017

디지털 미디어의 활용이 활발하게 진행됨에 따라 UI/UX에 대한 관심 및 중요성이 증가하고 있다. 이에 교육용 모바일 앱 개발 시 가치분석 모형을 바탕으로 디자인 평가 모형을 설계하고 이를 바탕으로 한 개발방향을 제시하고자 한다. 소비자 가치 분석을 바탕으로 한 디자인 평가모형의 주요 요인들은 소비자의 지속적 사용에 영향을 미친다. 이에 앱 개발 시 기존 애자일 방식의 개발 단계에 사용자 가치 분석을 바탕으로 한 디자인 평가 주요 요인들을 반영하게 되면 최적의 UX환경을 제공할 수 있다. 이렇게 개발된 앱은 소비자에게 만족감을 높여주게 되어 지속적인 사용에 긍정적인 영향을 미칠 것으로 기대한다.

• 디지털융복합연구
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• 제9권5호
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• pp.253-263
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• 2011

본 연구는 국내의 중 고교생이 많이 사용하는 온라인 교육사이트의 서비스품질을 측정하는데 있어서 SERVPERF모형과 KS-SQI모형 중에서 어느 것이 더 적합한지를 비교 분석하였다. AMOS7을 이용하여 분석한 결과, SERVPERF모형에서 서비스품질은 신뢰성, 유형성, 반응성, 공감성, 확산성으로 측정하는 모형으로 나타났다. 또한 KS-SQI모형의 서비스품질은 본원적 서비스와 예상외 서비스로 구성된 성과차원과 신뢰성, 친절성, 적극지원성, 접근용이성, 매체유형성으로 구성된 과정 차원으로 구성된 측정모형으로 나타났다. 두 모형간 비교에서는 KS-SQI가 경로분석에 대한 모형적합도 측면에서 더 우수한 것으로 나타났다.

• 대한임베디드공학회논문지
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• 제10권1호
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• pp.25-31
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• 2015

The quality of medical treatment can be promoted by transmitting high-definition medical images and sharing these images. The high speed transmission network is a requirement for the ultra high-definition media. A high quality medical research and education can be provided by connecting resources and media-data through the superhigh speed research network. Network bandwidth for 4K media transmission generated with Lambda network technology.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2018년도 추계학술대회
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• pp.3-5
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• 2018

4차 산업혁명 대비 방송미디어 교육학습 역량을 강화하기 위해서는 현장중심의 교육 모델을 개발하여 활성화 할 필요가 있다. 본 논문은 특성화 대학의 방송미디어 교육 품질을 향상시키는데 기여하기 위해 방송채널을 운영하며 이를 활용하여 방송미디어 교육과 접목시킨 연구 결과에 대해 기술하였다. 이론교육과 단순한 실습으로 종합예술분야인 방송제작 역량을 키우는 데는 한계가 있다. 따라서 실제 현장직무를 수행하는 전국방송채널을 개국하여 축적된 방송미디어 인프라를 활용하고 방송국을 중심으로 한 현장중심의 교육체계를 구축, 운영함으로써 교육의 질을 향상시켰다. 그 결과, 서로 다른 전공의 학생들이 콘텐츠 제작 교육에 함께 참여함으로써 직무능력 향상 및 취업의 확대는 물론이고 대학의 비즈니스모델 창출로 산학협력도 강화되는 계기를 마련하였다.

• The Journal of Asian Finance, Economics and Business
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• 제7권4호
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• pp.235-245
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• 2020

The study seeks to identify factors affecting the choice of a university by first-year Business Administration students in Vietnam. Probability sampling is using Stratified sampling of 500 students from five private universities in Ho Chi Minh City surveyed by convenience sampling. This paper employs mixed research methods - measuring Cronbach's Alpha, EFA, Regression and using PATH model - to test the hypotheses of the research model. The results of the study identify five factors: Prestige, Geographical location, Facilities, Attractiveness of the field and Media. All these factors have a positive influence on the standing of the university brand. It means that the higher the Prestige, Geographical location, Facilities, Attractiveness of the field and Media, the higher the university brand. The results indicate that Geographical location is the most influential factor to enhance the private university's brand. Bringing Geographical location is, thus, advisable to enhance a university standing. The brand plays a determining role in students' trust when selecting a university. Media is still the top concern of new students when they choose to study at a university. Media still remains an important consideration for new students when choosing a university. So, this factor should be utilized by universities to enhance their attractiveness.

• 보건행정학회지
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• 제4권1호
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• pp.25-48
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• 1994

Noncompliance with treatment is a serious problem in the management of hypertension. We explored self-reported medication taking compliance behavior of 194 high blood pressure patients using modified health belief model hypothesizing interaction between model components. Data were collected from patients resistered hwachon community hypertension control program during February, 1993. Bivariate analysis showed perceived severity of complication, present symptom experience(p<0.05), perceived severity of hypertension and education leve(p<0.01) were significantly related to treatment experience. Logit analysis revealed that perceived severity of hypertension, perceived benefits of treatment, perceived barriers to treatment and interaction term between perceived severity of hypertension and perceived benefits of treatment contributed treatment experience. Health education from mass media was siglificantly related to continuity of treatment. We also concluded that the inclusion of interaction effects between health belief model components and the use of patient group as analysis unit lead to better study results.

• Human Ecology Research
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• 제59권2호
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• pp.233-243
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• 2021

This study examined the longitudinal effects of media usage by early school-age children and of maternal parenting stress on children's school adjustment. The study focused on the mediating effect of executive function difficulty. Longitudinal data to examine the hypothetical model were drawn from the eighth (2015) through tenth (2017) waves of the Panel Study of Korean Children (PSKC) collected by the Korea Institute of Child Care and Education (KICCE). A total of 581 children (293 boys and 288 girls) and their mothers were included. Confirmatory factor analysis, structural equation model, and bootstrapping analysis were applied using SPSS 25.0 and Amos 26.0. The results are as follows. First, no significant correlation was found between early school-age children's media usage and maternal parenting stress. Second, neither media usage by early school-age children nor maternal parenting stress were found to directly affect children's school adjustment. Third, media usage by early school-age children and maternal parenting stress were shown to indirectly affect children's school adjustment via executive function difficulties. In other words, higher levels of media usage by early school-age children and maternal parenting stress during the first grade lead to greater executive function difficulties after a year, which, in turn, lead to a lower level of school adjustment in the third grade. This study indicates the need to develop practical support for the psychological wellbeing of mothers while they are performing their role as a parent and for children in maintaining suitable levels of media usage during early childhood.

• Journal of Korean Biological Nursing Science
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• 제11권1호
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• pp.51-58
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• 2009

Purpose: It is to verify learning effect of the instructional media on anatomy classes at a nursing college and to develop an alternative instructional media instead of cadaver. Method: Four groups pretest-posttest experimental design were used. One hundred twenty students who attended an Anatomy lecture in September, 2009 were selected After attending the anatomy lecture, the subjects were divided into four group (30 for each group) conveniently. The heart anatomy knowledge level were measured by a self evaluation questionnaire and quiz before and after a different instructional media being applied for each group including making heart shape using colored clay, taking picture of a real heart, sketching the heart model with color pencil and drawing heart presented in the anatomy textbook. Data was analyzed by t-test, ANNOVA test using the SPSS/PC WIN 12 version. Result: A statistically significant differences in the level of heart anatomy knowledge acquirement was noted after four different instructional media being applied, and four different instructional media was effective to the anatomy practice education. However, no difference in statistical post test results was noted among the four groups. Conclusion: It is recommended that further comparative studies on the learning effect between human cadaver practice and different instructional media is necessary.

• 지구물리와물리탐사
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• 제11권2호
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• pp.153-160
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• 2008

실제 매질에서 전파하는 파의 거동을 묘사하기 위하여 탄성파 모델링을 수행한다. 일반적으로 실제매질은 반무한 매질이나 컴퓨터를 이용한 수치모델링에서 반무한 매질을 표현하기는 쉽지 않다. 따라서, 유한한 크기의 모형을 가정하며, 이 경우 모형의 좌우 및 하부 경계는 가상의 경계이므로 이로부터 반사되는 인위적인 반사파들은 적절한 경계조건을 도입하여 제거되어야 한다. 최근 들어 등방성 매질 뿐 아니라 이방성 매질에 대한 연구가 증가하면서 이방성 매질에서의 경계를 적절히 표현해 줄 수 있는 방법이 필요하게 되었다. 본 연구에서는 등방성 매질의 탄성파 모델링에서 가장 많이 이용되는 스펀지 경계조건, Clayton과 Engquist가 제안한 흡수경계조건, Higdon의 흡수경계조건 세 방법을 이방성 매질에 적용할 수 있도록 변형한 후 다양한 포아송의 비를 갖는 모형에 적용함으로써 세 경계조건의 특성을 분석해 보았다. Clayton과 Engquist의 흡수경계조건은 등방성 매질에서 포아송의 비가 클 때 불안정한 모습을 보이는데, 이방성 매질에서도 역시 같은 결과를 보여주었다. 스펀지 경계조건은 등방성 매질과 이방성 매질에서 매우 좋은 결과를 보여주었지만, 컴퓨터 메모리나 계산시간을 고려하였을 때 비효율적이다. 이에 반해 Higdon이 제안한 경계조건은 필요로 하는 컴퓨터 메모리와 계산시간이 적을 뿐 아니라 큰 각도로 입사되는 파에 의해 발생하는 반사파까지 효과적으로 제거하였다. 따라서 포아송의 비가 비교적 크게 나타나는 이방성 매질에서는 계산상의 효율성 등을 고려할 때 Higdon의 흡수경계조건이 적합할 것으로 생각된다.