• 한국식품과학회지
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• 제15권1호
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• pp.77-89
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• 1983

국산(國産) 미강유(米糠油)의 성상(性狀)과 튀김적성(適性)을 조사(調査)하기 위하여 여러 가지 물리화학적(物理化學的) 실험(實驗)을 한 결과(結果) 다음과 같은 결론(結論)을 얻었다. 1) Gas chromatography에 의한 국산(國産) 미강유(米糠油)의 지방산조성(脂肪酸組成)을 조사(調査)한 결과(結果), 즉(卽) 보고(報告)된 바와 같고 외국미강유(外國米糠油) 지방산조성(脂肪酸組成)과도 비슷한 수치임을 알 수 있었다. 또한 TLC, column chromatography 및 high performance liquid chromatography 분석법(分析法)에 의하여 국산(國産) 미강유(米糠油)의 mono-, di-, 및 triglyceride 함량(含量)을 측정(測定)한 결과(結果), monoglyceride $1{\sim}4%$, diglyceride $20{\sim}30%$, triglyceride $66{\sim}80%$로서 일반(一般) 식용유(食用油)와는 전연(全然) 다른 glyceride조성(組成)을 나타내었다. 2) 국산(國産) 미강유(米糠油)는 monoglyceride 및 diglyceride 함량(含量)이 많기 때문에 비중(比重) 및 수용해도(水溶解度)는 높은 값을 나타냈으나, 튀김적성(適性)에서 산(酸)값, 색상(色相), 석유(石油)에테르 불용성산화산(不溶性酸化酸), 발연도(發煙度) 등에 큰 영향(影響)을 끼치는 인자(因子)는 아니었다. 3) 국산(國産) 미강유(米糠油)는 지방산조성(脂肪酸組成) 분석결과(分析結果), 불포화도(不飽和度)가 높은 리놀레산 함량(含量)이 적기 때문에 튀김실험(實驗)에서 안정(安定)된 기름으로 평가(評價)할 수 있으며 대두유(大豆油)의 경우는 역시 중합(重合)이 쉽게 일어나는 결과(結果)를 얻었다. 4) 국산(國産) 미강유(米糠油)가 튀김적성(適性)에서 발연도(發煙度)가 낮고, 거품이 심(甚)하게 일어나며, 점도상승(粘度上昇)이 일어나는 현상(現象)은 미강유(米糠油) 중(中)에 함유(含有)된 불순물(不純物)로 인(因)한 것으로서, monoglyceride 및 diglyceride의 영향(影響)은 적은 것으로 나타났다. 5) 거품이 심(甚)하고, 발연도(發煙度)가 낮은 기름에서는 튀김물의 맛과 외관(外觀)에 나쁜 영향(影響)이 나타났는데, 이는 기름 중(中)에 있는 여러 가지 불순물(不純物)로 인(因)한 것이었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2004년도 학술.기술논문발표회
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• pp.45-50
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• 2004

In this study, we processed two procedures of application test of filler for special-purpose utility that are new application methods of aerated concrete and properties test of aerated concrete according to mixing ratio because we investigated the better use of aerated concrete as filler for fireproof safety and we proposed basic data about standardization of mixing of aerated concrete. We measured flow and volume change of aerated concrete. And if its volume doesn't change, we added measuring unit weight and compressive strength. To test application of aerated concrete as filler for fireproof safety, we filled up aerated concrete to fireproof safety according to suitable mixing ratio. Then we measured maximum temperature of inner part of fireproof safety in accordance with the standard test of fireproof. According to the results, aerated concrete as filler for fireproof safety could be possibly used. So when we make aerated concrete, we should consider using an adding agent as well as a foaming agent.

• 한국재난정보학회 논문집
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• 제14권1호
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• pp.79-88
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• 2018

본 연구에서는 긴급복구용 팽창재료의 온도에 따른 팽창량 및 강도의 변화를 컵발포 실험과 일축압축강도 실험을 통하여 물리적 특성을 확인하였고, 장기안전성을 확인하기 위하여 가속 압축 크리프 시험을 진행하였다. 크리프 성능을 평가하기 위하여 단기 크리프 시험과 가속 압축 크리프 실험을 실시하였으며, 단기크리프 실험은 팽창재료의 초기 크리프 변형률을 결정하고 시간-온도 중첩정리가 적용된 단계 등온법은 가속시험방법으로 장기 압축 크리프 성능을 평가하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.355-360
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• 2002

The purpose of this study was to remove the excessive air foaming which was produced in mixing the RSLMC(latex-modified concrete with rapid- setting cement) by choosing the best antifoam agent type and the optimized quantity for performance improved RSLMC. A series of RSLMM(latex-modified mortar with rapid-setting cement) experiments were carried out as the basic for RSLMC with the main experimental variables such as antifiamer types(A, B, C, D), antifoamer contents(0, 1, 2, 3%). Air content test and compressive, flexural tests were carried out to measure the improved properties of RSLMM and RSLMC. Chloride ion permeability test was carried out to estimate water permeability resistance. The results of RSLMM showed that the decrease of 50% air content was obtained by admixturing a antifoam agent by 1%. The compressive strength and flexural strength at 3 hours after RSLMC placement were 235kgf/cm$^2$ and 49kgf/cm$^2$, respectively, which exceeded the flexural strength criterion of 45kgf/cm$^2$ in order to open the RSLMC placed to traffic. The chloride permeability using A and C antifoamer at 28 days were below 100 coulombs, which was the permeability rating of negligible according to ASTM.

• 한국대기환경학회지
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• 제20권2호
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• pp.153-159
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• 2004

This study was focused on evaluating physical properties and SO$_{x}$ removal capability of porous lime filters prepared by a foaming and a gelcasting method. Porosities of lime filters ranged from 55% to 85%, and their mean pore sizes were about 95 ${\mu}{\textrm}{m}$. It was observed that porous lime filters had the continuous pore structure that most pores were inter-connected by many windows. Before SO$_{x}$ removal reaction a surface of porous lime filters was made up of calcium oxide, but after reaction calcium sulfate became a main component. The SO$_{x}$ removal efficiency and the conversion ratio of calcium oxide to calcium sulfate increased according to reaction temperature and porosity. At 100$0^{\circ}C$, SO$_{x}$ removal efficiency of filters was always over 98% regardless of the porosity. In case of the filter with the porosity of 85%, the conversion ratios of calcium oxide increased according to the reaction temperature, and they were in the range 30% to 60%. to 60%.

• 한국생활과학회지
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• 제14권5호
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• pp.821-832
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• 2005

The purpose of this study is to investigate bathing habits and behaviors, and to find out consumers' needs for washcloth, which in this case refers to Korean exfoliating cloth for bathing purpose. Subjects of this study were females of 20s to 50s living in urban area. Four hundred and twenty-six (426) women were interviewed with a structured questionnaire. Data were analyzed by ANOVA, factor analysis, correlation analysis, MDS. The results of this study are briefly summarized as follows: The most popular bathing type was shower (84.9%). Personal hygiene was one of the commonest purpose of bathing, and other purposes included health maintenance, stress alleviation, and beauty in order. Dimensions of consumer needs for washcloth were extracted from factor analysis as following properties: tactile, tough, aesthetic, constructive, and hygienic. The preference for washcloth type was related to skin type. "Non-skin damage property" was the most important parameter to choose washcloth and the other parameters included massage effect, tactile property, foaming property, and easy-to-use property.

• 한국재료학회지
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• 제12권2호
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• pp.129-134
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• 2002

The optimum condition for fabricating cordierite disc type filter element was deduced. Cordierite monolith was used as starting material for filter element because it has many advantages such as high thermal shock resistance and good catalytic activity compared with $TiO_2$and SiC. The contents of organic additives and foaming agent were optimized to control the porosity and mechanical strength of cordierite filter. Among the required properties to be adopted as filter elements, the pressure drop and NOx removal efficiency were investigated depending on processing variables. It was found that pressure drop depends on particle size distribution of cordierite monolith and organic additives added as forming agent. The pressure drop at 5cm/sec of face velocity was in the range of 15~655mm$H_2O$ at room temperature. The NOx removal efficiency of catalytic filter with $V_2O_5$ as catalyst was over 85% at $450^{\circ}C$.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
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• pp.447-448
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• 2009

본 논문에서는 과산화수소($H_2O_2$) 분해 반응을 이용, 이산화망간($MnO_2$) 및 탄산수소나트륨($NaHCO_3$)을 촉매제로 사용하여 콘크리트 기포발생 유도를 극대화 하였다. 또한 기포콘크리트 초경량화를 이루기 위한 최적배합 도출 및 소요강도 확보 등의 다양한 실험을 통해 경량기포콘크리트의 물리적 역학적 특성을 알아보았다. 실험결과 전반적으로 KS F 4039 및 KS F 2459규정에 있는 품질기준에 충분히 만족하는 결과를 보였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 D
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• pp.1484-1486
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• 1998

Recently, extending the local broadcasting and increasing lots of informations, the low-loss communication cable is required in proportion as frequency. The reason of transportation loss causes to using the high frequencies like hundreds of MHz or decades of GHz. For the low transportation loss, it is required the developing-technology of foaming and the high foamed insulator with the dielectric ratio of the nearest to 1. Therefore, there is the purpose of developing the insulating materials for the low dielectric ratio. Also it is important to measure the attenuation, which is one of the important parameters, as the evaluation of transportation characteristic with frequency in the communication cable. In this paper, the result showed that the dielectric ratio(1.4) of the nearest to 1 and low attenuation with high frequency were very related to the transportation and reflection characteristics such as propagation velocity(82.27%), delay time and voltage standing wave ratio(VSWR).

• 한국세라믹학회지
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• 제45권10호
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• pp.584-588
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• 2008

Porous hydroxyapatite(HA) and HA-coated porous $Al_2O_3$ possessing pore characteristics required for bone substitutes were prepared by a slurry foaming method combined with gelcasting. The HA coating was deposited by heating porous $Al_2O_3$ substrates in an aqueous solution containing $Ca^{2+}$ and ${PO_4}^{3-}$ ions at $65{\sim}95^{\circ}C$ under ambient pressure. The pore characteristic, microstructure, and compressive strength were investigated and compared for the two kinds of samples. The porosity of the samples was about 81% and 80% for HA and $Al_2O_3$, respectively with a highly interconnected network of spherical pores with size ranging from 50 to $250{\mu}m$. The porous $Al_2O_3$ sample showed much higher compressive strength(25 MPa) than the porous HA sample(10 MPa). Fairly dense and uniform HA coating(about $2{\mu}m$ thick) was deposited on the porous $Al_2O_3$ sample. Since the compressive strength of cancellous bone is $2{\sim}12$ MPa, both the porous HA and HA-coated porous $Al_2O_3$ samples could be successfully utilized as scaffolds for bone repair. Especially the latter is expected suitable for load bearing bone substitutes due to its excellent strength.