• 한국환경과학회지
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• 제21권2호
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• pp.263-266
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• 2012

To compare the effects of two external forcing on track of typhoon, TWRF(Typhoon WRF) based ensemble experiments are carried out in the case of Typhoon Morako which is the 8th typhoon at Northwest Pacific region in 2009. The two forcing are tropical SST and topography induced thermal and mechanical forcing, respectively. According to the result of numerical experiment for five-day forecast, the effect of mechanical forcing is about two times stronger than thermal forcing on the track error of the typhoon. More case study for other typhoon will be done as a next paper.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
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• pp.33-34
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• 2009

본 연구는 순환굵은골재와 잔골재의 치환율을 변수로 하여 5개의 실물모형 기둥 실험체를 제작하여 축하중하에서 실험을 진행하였으며 KCI2007에서 규정하고 있는 압축 응력값을 만족하는 것으로 나타나 KCI 규준식은 순환골재를 사용한 철근콘크리트 기둥 설계에서 적용 가능한 것으로 판단된다.

• 한국보건간호학회지
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• 제28권2호
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• pp.285-297
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• 2014

Purpose: The purpose of this study was to investigate the structural relationship among the life stress, depression, suicidal ideation of adolescent. Methods: Participants for this study included 285 students from five middle schools located in Seoul and Gyeongsangbukdo, Korea. The SPSS 18.0 program and AMOS 18.0 program were used for analysis of data. Results: The characteristics of this study were to analyze causal relationship with latent variables by considering measurement error and to grasp direct effect, indirect effect and total effect. Life stress and depression were found to be factors influencing suicidal ideation. Depression was a direct factor and life stress was a indirect factor. The effects of depression as a mediator between life stress and suicidal ideation were significant statistically. Conclusion: The findings of this study may provide useful assistance in development of effective nursing interventions for prevention and management of middle school students' suicidal ideation.

• 한국유체기계학회 논문집
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• 제9권6호
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• pp.9-16
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• 2006

Performance characteristics of an axial flow fan having distorted inlet flow have been investigated using numerical analysis as well as experiment. Two kinds of hub-cap, rounded and right-angled front shape, are tested to investigate the effect of inlet flow distortion on the fan performance. Numerical solutions are validated in comparison with experimental data measured by a five-hole probe downstream of the fan rotor. It is found from the numerical results that non-uniform axial inlet velocity profile near the hub results in the change of inlet flow angle. Large recirculation flow upstream the fan rotor for the right-angled hub-cap induces a negative incidence, thus invokes separated flow on the blade surfaces and deteriorates the performance of fan rotor.

• Carbon letters
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• 제14권4호
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• pp.197-205
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• 2013

Five vapor-grown carbon nanofiber (VGCNF) reinforced vinyl ester (VE) nanocomposite configurations were fabricated, imaged, and mechanically tested in order to obtain information on the influence and the interactions of the role of the microstructure at lower length scales on the observed continuum level properties/response. Three independent variables (the nanofiber weight fraction and two types of nanofiber mixing techniques) were chosen to be varied from low, middle, and high values at equally spaced intervals. Multiple mixing techniques were studied to gain insight into the effect of mixing on the VGCNF dispersion within the VE matrix. The point count method was used for both lower length-scale imaging techniques to provide quantitative approximations of the magnitude and the distribution of such lower length-scale features. Finally, an inverse relationship was shown to exist between the stiffness and strength properties of the resulting nanocomposites under uniaxial quasistatic compression loading.

• 한국보건간호학회지
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• 제27권1호
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• pp.89-101
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• 2013

Purpose: The purpose of this study was to investigate the prevalence, characteristics, and factors related to falls occurring among the community-dwelling elderly. Methods: The subjects were 299 community-dwelling-elderly in Jeju Province. Data were collected via in-person interviews by five visiting nurses in October, 2012. Fall risk assessment tools developed by the CDC, K-ADL, HDS-K, and GDS were used for data collection. Results: A significant number of subjects (34.1%) had experienced a fall at least once within the last six months. Living arrangements, strokes, urinary incontinence, main daily activities, and depression were significant factors related to these falls. Other risk factors included heavy use of medications, difficulties in walking and standing, needing arms to stand up from a chair, and hearing loss. Conclusion: The results reveal critical factors related to falls among the community-dwelling elderly. These information should be used to develop and implement fall prevention programs in communities.

• 대한가정학회지
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• 제44권4호
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• pp.159-173
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• 2006

The purpose of this study was to investigate the seating style of children between Korea and USA viewed from activity analysis in child-care centers. Observation and depth-interview method were used for data collection. Ninety-eight children aged from 38 to almost 62 months were observed for five minutes three times during an indoor free play period in Korea and USA in 2003 and 2004. The results of the research were as follows. There were significant differences between the postures of Korean and American children. Korean children maintained floor-seating postures longer than chair-seating and standing postures. The factors such as sex, age and physical environment influenced the children's seating style, while playing-type influenced their posture. This study will contribute to our understanding of the physical environment and children's seating style according to culture.

• 대한한방소아과학회지
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• 제25권3호
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• pp.46-56
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• 2011

Objectives: The purpose of this study is to find a way to apply current oriental pediatrics treatment guidelines based on a pediatric herb chapter in Dong-eui-bo-gam. Methods: We classified herbs based on the four properties, five flavors, attributive channel, a dosage form of the medicine, diagnosis, toxicity and character. Results & Conclusions: The result of this study is that there were lots of things that we have to learn - characteristics of common herbs in pediatrics and pediatric diseases and pathology. From this study, we also learn about changes of pediatric physiology and pathology. More related studies can be helpful for updating the current oriental pediatric guidelines.

• 영어어문교육
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• 제13권4호
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• pp.233-252
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• 2007

The aim of this study is to propose a systematic way of evaluating competing ELT textbook series. Three stages of evaluation procedures were employed: A sample of two sets of English textbook series for young learners were first analysed by five trained textbook evaluators using a checklist. Second, based on the results of analysis, evaluative discussion was carried out. Third, two independent evaluators conducted impressionistic evaluation on the series. The procedure employed in this materials evaluation process can be adapted in choosing series of textbooks. Since not many studies have dealt the evaluation of textbook series by multiple evaluators, the method presented in this study can be referred to and applied by materials evaluators in other contexts.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1861-1867
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• 2010

This paper described the positioning algorithm of partial discharge in insulation oil by acoustic method for the application of an on-line diagnosis in oil-immersed transformers. In the experiment, five AE sensors having the resonant frequency of 150 kHz were used, and a signal conditioner was fabricated. A needle-plane electrode system which is composed of a needle with a curvature radius of $10{\mu}m$ and a plane electrode with a diameter of 60 mm was installed to simulate partial discharges in insulation oil. From the time difference of arrival (TOA) of acoustic signal, we calculated the location of partial discharge in insulation oil. In the experiment, an algorithm of positioning of PD occurrence by the time difference of arrival was proposed. From the experimental results, the positioning error of PD calculated by three AE sensors was within 4%.