• Composites Research
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• 제33권6호
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• pp.341-345
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• 2020

열중량분석기를 적용하여 탄소섬유/에폭시 복합재의 구성재 함유량을 평가하기 위한 측정기법을 제시하였다. 시험에 사용된 시료는 탄소섬유/에폭시 토우 프리프레그로 제작된 스트랜드 시편에서 채취하였으며 시간에 따른 시료의 무게 변화를 실시간으로 측정하였다. 또한 전자현미경을 이용하여 수지 제거 여부와 탄소섬유의 열손상 상태를 관찰하였다. 연구결과에 따르면 열중량분석기를 적용하면 기존의 머플로를 적용한 경우에 비해 소량의 시료에 대해서도 시험이 가능하며, 설정 온도와 노출 시간을 제어함으로써 구성재의 함유량을 효율적이고 정량적으로 평가할 수 있음을 알 수 있었다.

• 한국과학교육학회지
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• 제11권2호
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• pp.31-48
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• 1991

Lesson plan sheets were collected from letter communication of each local junior and senior high school as well as from literature. These lesson plan sheets were arranged and investigated for items of constituent element and types. The results were summarized as follows. 1. The organization of plans were constituted of three frames as early plan, unit plan, and hour plan. 2. The lecture and inquiry types among the collected lesson plan sheets showed 91.9% and 8.3% in junior high school as well as 87.9% and 3% in senior high school, respectively. The mixed types did not find out in junior high school, however the mixed types showed 9.1%in senior high school. 3. The items of constituent elements in lesson plan sheets were varied by the contents and the kinds of teaching unit in science education of secondary school.

• 한국해양학회지
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• 제5권1호
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• pp.14-29
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• 1970

김의 성장과 품질에 대한 환경수질의 중요성은 다시 말할 필요가 없다 김 양식기에 있어서의 환경수질의 변동을 보기 위해 저자의 한 사람은 섬진강 및 낙동강 하구 김밭에 대해 이미 조사한 바 있거니와 이번에는 우리나라 유수의 김 생산지인 완도군하 김밭의 수질을 전보와 같은 방법으로 조사하였다. 조사지점으로서는 완도군 에서대체로 대표적 김밭이라 볼 수 있는 두 지점을 선정하여 1968년 10월부터 1969년 2월까지 매월 대조일에서의 수질변동을 조수의 일조기에 걸쳐 1시간마다 각 성분량을 측정하므로써 조사하였다.

• 농촌계획
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• 제21권4호
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• pp.103-113
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• 2015

This study has been done to have a good grasp at the importance among the constituent elements of the rural healing tourism for working out the rural healing tourism planning. The above constituent elements were produced from the survey targeting the rural area-visiting visitors. For this study, 350 questionnaires were distributed to them and 306 out of them, valid, were collected. For the analysis of correlation among each item in the questionnaires, T-test, ANOVA were carried out. The results of the analysis of the questionnaires show that the consumers of the rural healing tourism have interest in the rural healing tourism regardless of their gender. The results also show that the consumers lay stress on the aspect of the infrastructure(H/W) more than contents-based aspect of the healing tourism(S/W). While especially, regarding healing tourism facilities or infrastructure, this study shows that there is significant difference in every item except gender item, regarding the contents and purpose of the rural healing tourism there is a significant difference among groups only in the item of age.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 추계학술대회 논문집
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• pp.213-216
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• 2009

In this study, three cold-rolled TRIP steels containing different Al content (0.04wt%, 1.0 wt.% and 2.00wt%) were fabricated to understand the complex effects of Al in TRIP steel. The influences of Al on microstructural evolution of cold-rolled TRIP steels have been analyzed by using advanced analysis techniques, such as transmission electron microscope (TEM) and three dimensional atom probe tomography (3D-APT). TEM results revealed that second phases such as bainte and retained austenite decrease with increase of Al content. In addition, 3D-APT was used to characterize atomic-scale distribution of alloying elements at the constituent phases. Through these analysis techniques, the advanced characteristics of constituent microstructure in TRIP steels were identified depending on Al contents in TRIP steels.

• 한국세라믹학회지
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• 제36권10호
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• pp.1123-1131
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• 1999

Alumina-glass composites which are considered as the material of the choice for all dental crown was prepared by aqeous-based tape casting and sintering for 2h at 1120$^{\circ}C$ followed by glass infiltration for 2h at 1100$^{\circ}C$ Biaxial strength and fracture toughness of the composites were evaluated to determine the optimum composition of the tape as a function of the amount of constituent such as alumina binder and plasticizer. The strength and the fracture toughness of the alumina tape increased with increasing the contents of alumina and binder. These observations are consistent with in fluence of the constituents on mean alumuna particle distance in tapes suggesting that high strength of the glass infiltrated alumina composites is related to toughening by crack bowing. The biaxial strength and the fracture toughness of the composite containing the optimum constituent composition were 523 MPa and 3.3 MPa$.$1/2 respectively.

• Journal of Biosystems Engineering
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• 제23권3호
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• pp.253-258
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• 1998

The part I was for developing regression models to predict the moisture content, protein content and viscosity of brown and milled rice using Near Infrared(NIR) Reflectance analyzer. The purpose of this study(part II) is to measure fundamental data required for the prediction of rice quality, and to develop regression models to predict the protein content of brown and milled rice, brown rice yield from undried paddy powder by using Near Infrared(NIR) Reflectance analyzer. The results of this study were summarized as follows : The predicted values of protein contents obtained from the undried paddy powder were well correlated to the measured values from brown and milled rice. The predicted yields of brown rice from undried paddy powder were not well correlated to the lab measured values from dried paddy. Continuous study in wavelength selection and of constituent relationship is necessary for practical application.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1998년도 하계 학술대회 논문집
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• pp.171-177
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• 1998

The part Ⅰ was for developing regression models to predict the moisture content, protein content and viscosity of brown and milled rice using Near Unfrared (NIR) Reflectance analyzer. The purpose of this study(part Ⅱ) is to measure fundamental data required for the prediction of rice quality , and to develop regression models to predict the protein content of brown and milled rice, brown rice yield from undreid paddy powder by using Near Infrared (NIR) Reflectance analyzer. The results of this study were summarized as follows . The predicted values of protein contents obtained from the undried paddy powder were will correlated to the measured values from brown and milled rice. The predicted yields of brown rice from undried paddy powder were not well correlated to be lab measured values from dried paddy. Continuous study in wavelength selection and of constituent relationship is necessary for practical application.

• Current Research on Agriculture and Life Sciences
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• 제11권
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• pp.19-23
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• 1993

지황(地黃)의 주(主) 약효성분(藥效成分)으로 알려져 있는 catalpol의 iridoid골격(骨格)과 glycosidic bond를 형성(形成)하는 유리당류(遊離糖類)를 확인(確認)하기 위하여 생육시기(生有時期)에 따른 무기성분(無記性分), 유리당류(遊離糖類), 회분(灰分), 엑기스 및 catalpol의 함량(含量)을 조사(調査)하였다. 수확기(收穫期)가 가까워질수록 P, K, Ca, Mg, Cu 및 회분(灰分)의 함량(含量)은 감소(減少)하였으나, Fe 및 엑기스의 함량(含量)은 증가(增加)하였다. 수확기(收穫期)가 가까워질수록 전당(全糖), sucrose 및 galactose의 함량(含量)은 감소(減少)하였으나, fructose 및 catalpol의 함량(含量)은 증가(增加)하였다.

• 대한지구과학교육학회지
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• 제3권1호
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• pp.9-17
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• 2010

This study was carried out to examine the tendency about the relative importance of STS education of the 6th and 7th primary science curriculum. The results of the research are as follows. Primary science textbooks in the 6th curriculum, average 13.3% of the total pages was assigned to STS contents but it is increased to 24.2% in the science textbooks of the 7th curriculum. STS constituents of the 6th primary science textbooks come out orderly applications of scientific knowledge(47.1%), relevance of a community(40%), social problems and issues(11.8%). Of the 7th science textbooks, the contents about applications of scientific knowledge amount to 67.1% of the total STS constituent and relevance of a community(32.2%) rank behind it. The contents of other components are not enough. The 6th science textbooks contents about the effect of technological development amount to 35.3% of the total STS subject area, and environmental quality(20.0%), natural resource(15.2%), energy(11.8%), sociology of science(11.8%) ranks behind it. In the 7th science textbooks ranking is the effect of technological development(42.3%), natural resource(17.3%), energy(12.5%), sociology of science(12.5%), environmental quality(20.0%). There are few contents about population, human engineering and space research and national defense in the science textbooks.