• 한국의류학회지
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• 제34권11호
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• pp.1889-1899
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• 2010

This study examines the preparation and characterization of Kenaf/Starch bio-composites used as filler and a matrix. Kenaf was cultivated in Chung-ju in Korea, and the Kenaf/Starch bio-composites were prepared under various conditions of kenaf fiber length (1-5 centimeters); the content of Kenaf fiber was 10%, 20%, 30%, and 40%, and the number of composite layers (one-four). Depending on the formation conditions of Kenaf/Starch composites, the physical properties such as tensile strength, elongation, and the young modulus of the Kenaf/Starch composites were measured. In addition, we measured the SEM cross-section images in order to investigate the interfacial adhesion properties of fractured surfaces. As a result, the tensile strength and elongation of the Kenaf/Starch composites were highest in the molding conditions of a hot press at $120^{\circ}C$, 3000PSI of pressure, and for 30 minute periods. The result of measuring the physical properties of the composites manufactured by varying the content of Kenaf fiber when the content of Kenaf fiber was 30% as well the physical properties of the Kenaf/Starch composite was found desirable. It was found that the physical properties improved with more overlapped layers in the composites manufactured by varying the number of overlapped layers. Through the measuring of the SEM cross-section images, we found that the interfacial adhesion state between the filler and matrix of Kenaf/Starch composite greatly affects the physical properties.

• 가족자원경영과 정책
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• 제19권4호
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• pp.19-33
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• 2015

The purpose of this study is to explain. It also examines and compares factors influencing life satisfaction among the middle-aged at various income levels. The data source for this study was the third additional wave and the fourth wave of the Korean Retirement and Income The study sample consisted of 1,723 middle-aged (age 50-64) individuals. The data analysis methods included the chi-square test, ANOVA, and multiple regression analysis. The results were as follows. First, there was a positive relationship between old age preparation and life satisfaction. Second, it was found that old age preparations (physical, emotional, social, financial) and life satisfaction show meaningful relationships among the income levels. Third, old age preparation was found to have different meaningful impacts on life satisfaction among the income levels. The results of this study verify the degree of the relationship between old age preparation and life satisfaction and the different impact factors relating to old age preparation for life satisfaction among the income levels.

• 한국환경과학회지
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• 제13권3호
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• pp.319-325
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• 2004

An experimental study on the preparation of monolithic porous polymers by environmentally friend process in supercritical carbon dioxide has been carried out. Polymerization mixture composed of a cross-linking monomer, initiator and functional co-polymer was charged in the reactor with sapphire window. After the system was purged with a flow of $CO_2$ for 15 min, the reactor was pressurized with liquid $CO_2$ up to 100 bars. The reactor was isolated from and placed back to the system via quick connector for shaking until the mixture had become fully homogeneous. The reactor was then heated and pressurized to the required reaction conditions and left overnight. After cooling and $CO_2$ evacuation, the polymer was removed from the reactor as dry, white, continuous monoliths. The effect of experimental conditions on the physical properties of porous polymer was systematically examined, and it was found that monomer content had a major effect on the physical properties of the polymers.

• Journal of Pharmaceutical Investigation
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• 제5권3호
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• pp.58-65
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• 1975

In the preparation of prednisolone tablets, when microfine cellulose$(Elcema^{\circledR})$ was used as diluents, stability and physical characteristics of prednisolone tablets are as follows; 1. Weight of the plain $Elcema^{\circledR}$ tablets increased by 75% of relative humidity and hardness was weakend, but the temperature $(60^{\circ}C)$ caused no change of thickness and decreased the weight and hardness. 2. In experimental tableting of prednisolone tablets, the addition of $Elcema^{\circledR}$ caused no difficulty in direct compression method, and the shortening of the disintegration time and increase of the hardness were satisfactory. 3. Dissolution rate test exhibited the result similiar to disintegration test. 4. In the comparison test of $Elcema^{\circledR}$ and $Avicel^{\circledR}$ as adjuvants the physical constants of prednisolone tablets showed nearly a similar tendency.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2006년도 춘계학술대회 논문집
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• pp.86-90
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• 2006

Nanoimprint lithography (NIL) is a novel method to fabricate nanometer scale patterns. It is a simple process with low cost, high throughput and high resolution. NIL process creates patterns by the mechanical deformation of imprint resist and physical contact process. This physical contact process causes the stiction between the resist and the stamp. Stiction becomes a key issue especially in the stamps including narrow pattern size and wide area during NIL process development. The antistiction layer coating using fluorocarbon is very effective to prevent this problem and ensure successful NIL. In this paper, the concept of antistiction coating is explained and different preparation methods for nanoimprinting are briefly discussed.

• Elastomers and Composites
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• 제54권1호
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• pp.30-34
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• 2019

Four different diisocyanates (IPDI; isophorone diisocyanate, HDI; hexamethylene diisocyanate, HMDI; dicyclohexylmethane-4,4'-diisocyanate, and XDI; m-xylylene diisocyanate) were used to prepare polyurethane gel-coats, and the weatherabilities, physical properties, and surface characteristics of the gel-coats were investigated with respect to the chemical structure of the diisocyanates. The weathering test results indicated that all of the diisocyanates used in this study were suitable for use in the preparation of the polyurethane gel-coat. However, the set-to-touch times and physical properties of the polyurethane gel-coat indicated that the cycloaliphatic diisocyanate (IPDI and HMDI) were ideal for the preparation of polyurethane gel-coats.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
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• pp.594-594
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• 2001

Increased demand for esthetic restorations has promoted a growing interest in tooth-colored restorations even in the posterior regions. Preparation for specific types of indirect inlay and onlays may vary because of differences in fabrication steps for each commercial system and variations in the physical properties of the restorative materials. Preparations for indirect inlay/onlay basically are meant to provide adequate thickness for restorative material and at the same time a passive insertion pattern with rounded internal angles and well defined margins after deciding what type of restoration is indicated.(omitted)

• 대한정형도수물리치료학회지
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• 제4권1호
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• pp.21-33
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• 1998

This Evaluation was made through 300 persons who had attended the lecture organized by O. M. P. T. (Orthopeadic Manual Physical Therapy) during the period of January to June 1998 in Seoul and in other six(6) cities. The result of evaluation is summarized as follows : 1. With regard to general satisfaction with lecture, it was evaluated as 'more than good 'by 204 person(68.0%) for 'Preparation for lecture of lecturer' and by 194 person (64.7%) for 'Teaching Method'. Statistically, the significance was largely given to 'Place and Preparation for Lecture of Lecturer' and 'Preparation for Lecture as per each Lecturer' (P< 0.001). 2. With regard to understanding of lecture, it was evaluated as 'more then good' by 190 persons(63.3%) for 'Appropriate Teaching Hours' and by 149 persons(49.7%) for 'Appropriate Degree of Lecture Difficulties'. Statistically, the significance was largely given to 'Lecturer and Appropriateness of Teaching Hours' (P< 0.05) and 'Appropriateness of Teaching Courses and Degree of Lecture Difficulties' (P< 0.01). 3. With regard to satisfaction with lecture's performance, it was evaluated as 'more than good' by 194 persons(64.7%) for 'Lecturer's Zeal for Teaching' and by 198 persons(66.8%) for 'Suitability of Textbook'. Statistically, the significance was largely given to 'Sex Distinction and Lectuer's Zeal for Teaching' (P< 0.01) and 'Lecturer and Suitability of Textbook' (P< 0.05). 4. With regard to teaching environment, it was evaluated as 'more than good' by 102 persons(37.4%) for 'Appropriateness of Teaching Environment' and by 193 persons(64.3%) for 'Provision of Appropriate Audio-Visual Aids for Teaching'. Statistically, the significance was largely given to 'Place and Appropriateness of audio-visual aids for Teaching' (P<0.05). 5. With regard to parctical use of lecture, it was evaluated as 'more than good' by 172 persons(54.7%) for 'Usefulness to clinical demonstration' and by 209 person(69.6%) for 'Attitude towards study'. With the result of evaluation made as in the above, we are able to see that the education of orthopedic physical therapy which is organized by Orthpedic Physical Therapy Society of Korea, is being successfully conducted and evaluated by its members, and furthermore the staff of this society has to make his best endeavoures for the growth of this society and for the development of this education.

• 한국콘텐츠학회논문지
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• 제12권6호
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• pp.249-264
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• 2012

본 연구는 성공적 노화에 대한 이론적 고찰을 통해 성공적 노화의 개념을 명확히 하고, 이를 위해서 어떻게 노후를 준비하여야 하는가를 밝히고자 하였다. 근로자의 노후준비에 영향을 미치는 요인들을 조사하고 그 요인들이 노후준비에 어떻게 영향을 미치는지를 확인하기 위해 경기도에 위치하는 반월공단과 시화공단에 근무하고 있는 40세 이상의 근로자를 대상으로 조사하였다. 조사기간은 2011년 10월 10일부터 10월 31일까지였으며, 수집된 자료는 총 280부였고, 이중 결측값이 있는 자료를 제외한 총 261부를 최종 분석 자료로 사용하였다. 자료의 분석은 SPSS 18.0 프로그램을 이용하여 빈도분석, 요인분석, 차이검정, 그리고 다중회귀분석 등을 실시하였다. 연구결과는 다음과 같다. 첫째, 인구사회학적 특성이 노후 준비도에 미치는 영향에 대한 분석결과 건강상태가 전반적인 노후준비에 정(+)의 영향을 미치고, 연령, 학력, 월 평균수입, 종교, 그리고 자녀수가 부분적으로 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 업무특성이 노후준비에 미치는 영향관계에 관한 분석에서 직무만족은 신체적 노후준비와 경제적 노후준비에 정(+)의 영향을 미치고, 직업몰입은 경제적 노후준비에만 영향을 미치는 것으로 나타났다. 세째, 인구사회학적 특성에 따른 노후준비도의 차이분석에서 연령, 학력, 배우자 유무, 종교유무, 건강상태, 그리고 자녀수에서 차이가 나타났다.

• International Journal of Human Ecology
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• 제13권2호
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• pp.53-67
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• 2012

This study uses the 1999-2009 Korean Time Use Survey to explore how mothers' employment affects parental time spent in activities that may relate to their children's weight. Specifically, it estimates two-part regression models to assess the effects of maternal employment upon the amount of time mothers spend in activities potentially related to their preschool children's eating and physical activity. The findings suggest that working mothers and those mothers who work longer hours allocate significantly less time in food preparation, eating with the child, and supervising the child's physical activity than mothers who are not employed and those who work fewer hours. The paper also finds that spouses of working mothers do not allocate more time to these activities to offset the reduction in mothers' time. Also, using local unemployment rates as instrumental variables, maternal employment is found to allow mothers to spend significantly more time on food preparation and family meals, although its effect on mothers' total childcare time is negative. Several aspects of Korean society may have made the relationship between maternal employment and childhood weight issues different from what was found in other countries.