• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.227-230
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• 2008

본 논문은 알칼리토금속계인 마그네슘 등의 수화 반응에 수반되는 반응열과 전기화학적 작용을 이용하여 버너와 같은 화기를 이용하지 않고 야외에서 생수 등을 간접가열 하여 커피, 컵라면, 분유, 피자등의 음식을 가열 할 수 있는 발열제품을 개발하는 데이터를 얻었다. 마그네슘과 금속계 화합물을 혼합하여 tea bag에 넣어 셀 형태로 만들어 발열효과를 높이기 위해 특수시험관의 재질 및 두께의존성, 발열제 양과 혼합물질에 따른 온도특성 등을 확인하였다. 발열제에서 발생되는 열의 효율적인 전달과 포장 재질의 선정 및 휴대의 간편성 등을 고려하여 타당성을 검증하였다.

• Applied Chemistry for Engineering
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• v.21 no.5
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• pp.532-536
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• 2010

A study on the volatile organic compounds (VOCs) and low molecular weight (LMW) amount which is contained within bisphenol A polycarbonate (PC) was performed by the solvent extraction with ketone type solvents (acetone, butanone, pentanone). The LMW amount of untreated PC was 2.6 wt%, but the values of treated samples with acetone and pentanone were 0.96 and 1.53 wt%, respectively. Acetone is a more effective solvent than pentanone on the LMW extraction. Methylene chloride (MC) and toluene were certified and quantified by GC-Mass experiments, and the quantitative results indicated the fact that the pentanone was the effective solvent on VOC extraction. Focused on the change of VOCs and LMW amount, the use of co-solvent might be more useful, and the experimental results of co-solvent extraction showed that the optimum condition was 50 : 50 volume percent.

• Journal of Korean Society for Atmospheric Environment
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• v.4 no.2
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• pp.11-19
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• 1988

대기오염물질 속에 함유되어 있는 다환방향족 탄화수소 (PAHs)는 분자식 구조가 비슷한 수십개의 이성질체가 여러 종류의 유기화합물과 혼합되어 존재한다. 본 연구에서는 환경오염 시료중의 PAHs를 분석하는데 있어서 분석방법과 결과를 비교하기 위하여 지침이 될 수 있는 환경표준 기준물을 개발할 목적으로 굴뚝 안쪽벽에서 긁어 채취한 검댕을 시료로 선책하여 액체/액체 용매 추출방법에 의해 PAHs 분류부분을 얻었다. Phenanthrene 이외의 30여종의 PAHs 화합물을 가스크로마토그라피의 머무른시간과 가스크로마토그라피/질량분석기에 의하여 분리, 판명하였고 5종의 주 PAHs 화합물을 정확하게 정량 분석하였다. 정량분석 결과의 신뢰도, 정확도, 정밀도는 미국 NBS의 표준기준물 1647을 분석하여 검정치와 비교함으로써 평가하였다.

• Microbiology and Biotechnology Letters
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• v.19 no.6
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• pp.631-636
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• 1991

The bacteria which can biodegrade aromatic compounds were screened from soil and wastewater. The isolated Pseudomonas sp. HC107 had high removal rate of COD and phenol. And also this strain grew on m-cresol, salicylate, toluene, 2, 4-D and benzene. When the strain culture (2 ml/day) was treated on continuous reactor at mixed wastewater from chemical, pharmaceutical and dye industry, the treatment rate of COD, BOD and phenol was to be about 92.5%, 95.3% and 93.5%, respectively.

• Journal of the Korean Wood Science and Technology
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• v.25 no.2
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• pp.110-116
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• 1997

생강나무의 수피를 아세톤-물 (7:3)의 혼합용액으로 추출하여 에틸아세테이트용성과 수용성 화합물로 분리하였고 이중에서 에틸아세테이트용성 부분을 Sephadex LH-20과 TSK 40F로 충진한 칼럼크로마토그래피를 사용하여 5개의 화합물, 즉 (+)-catechin, (-)-epicatechin, quercetin 그리고 epicatechin-($4{\beta}{\rightarrow}6$-catechin 이량체와 epicatechin-($2{\beta}{\rightarrow}7$, $4{\beta}{\rightarrow}8$)-epicatechin 이량체를 단리 하였다. 단일물의 확인을 위하여 박층크로마토그래피를 실시하였으며, 화합물의 정확한 구조는 $^1H$-NMR과 $^{13}C$-NMR 스펙트럼을 이용하여 규명하였다.

• Electrical & Electronic Materials
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• v.5 no.2
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• pp.244-251
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• 1992

무독성 혼합안정제 Zn/Ca-stearate의 방사선 안정화 효과를 증진시키기 위해서 oxy-methylene, oxy-ethylene 및 oxy-porpylene 구조의 직쇄형 및 고리형 에테르 화합물을 PVC에 배합하여 방사선조사 하였을 때 PVC의 색차변화를 측정하여 이들 에테르 화합물의 방사선 안정화 효과를 비교 검토하였다. 에테르 화합물에서 oxy-ethylene 구조단위수 4이상인 직쇄형 에테르 또는 고리형 에테르와 oxy-propylene 구조단위수 7인 직쇄형 에테르는 매우 우수한 방사선 안정화 효과를 나타내고 있다. oxy-ethylene 또는 oxy-propylene 구조의 에테르의 방사선 안정화는 Zn/Ca-stearate에서 생성되는 ZnCl$_{2}$와 에테르의 주쇄구조 oxy-ethylene 또는 oxy-propylene의 착체반응에 의한 것으로 추정된다.

• Analytical Science and Technology
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• v.14 no.6
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• pp.494-498
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• 2001

In this study, cerium nitrate was used as an alternative to chromate for the surface-treatment of Al coated steel to improve the corrosion resistance. The surface of Al coated steel was characterized by means of a X-ray photoelectron spectroscopy(XPS). It was found that cerium on the surface of Al coated steel had a mixture of oxidation states such as Ce(+4) and Ce(+3), and the relative concentration of each state was 57 % and 43 %, respectively. The surface film consisting of these cerium compounds played an important role for achieving the corrosion resistance of Al coated steel.

• The Korean Journal of Mycology
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• v.39 no.3
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• pp.256-258
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• 2011

This study was conducted to investigate agents inducing conidial germination of an entomopathogenic fungus, Beauveria bassiana KK5. Different chemicals including carbohydrates were mixed with conidia of B. bassiana and incubated on water agar for 12 hours. Fructose, mannose and skim milk were useful for spore germination compared to other chemicals. Bioassays against green peach aphids were conducted with the fungal conidia suspended in 1% fructose, mannose and skim milk. Of them, a mixture of skim milk plus conidia of B. bassiana KK5 showed the highest mortalities against $3^{rd}$ instar of green peach aphid.

• Journal of Life Science
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• v.20 no.3
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• pp.350-355
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• 2010

This study was carried out in order to characterize the flavor of Pueraria radix-green tea. To make a new tea with good flavor and functional properties, Pueraria radix was mixed with green tea. Volatile flavor compounds of Pueraria radix-green tea were extracted by simultaneous distillations and extraction methods using a Likens and Nickerson's extraction apparatus. The concentrated extract was analyzed and identified by GC and GC-MS. Forty-nine compounds including $\beta$-selinene, $\beta$-caryophyllene, hexanal and nonanal were isolated and identified from Pueraria radix. Sixty-four compounds including nerolidol, linalool, linalool oxide and phenylethyl alcohol were isolated and identified from green tea. Eighty-two compounds including linalool, $\delta$-cadinene, limonene, $\beta$-caryophyllene and $\beta$-ionone were isolated and identified from Pueraria radix-green tea.

• Journal of Korea Foresty Energy
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• v.20 no.1
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• pp.42-52
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• 2001

The barks of Fraxinus rhynchophylla, Fraxinus sieboldiana and Fraxinus mandshurica, ash trees grown in domestic, were collected, extracted with acetone-H$_2$O(7:3, v/v) and freeze dried to give some dark brown powder. A portion of the freeze dried powder was chromatographed on a Sephadex LH-20 and a TSK 40F column using a series of aqueous methanol, ethanol and ethanol-hexane mixture as eluents Some spectrometric analyses such as NMR and FAB-MS including TLC were performed to identify the structures of the isolated compounds. The bark extractives contained a large amount of coumarin derivatives in addition to a small amount of ester compounds.