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김문석,김은미,장규섭 충남대학교 농업과학연구소 2008 농업과학연구 Vol.35 No.1
There were four types of Doenjang fermentation as following conditions for investigation ; 1) low temperature fermentation at 13℃ for 180 days, 2) low temperature at 13℃ for 7 days to room temperature at 30℃ for 10 days, to low temperature at 13℃ for 163 days, and for 173 days, 3) low temperature at 13℃ 7 days to room temperature at 30℃, 4) room temperature at 3 0℃ for 180 days. There were no changes of moisture, NaCl and total nitrogen content during fermentation period of four types conditions, but pH and amino type nitrogen decreased in room temperature at 30℃ for 180 days. It required 3 times more fermentation period until same quantity of the amino type nitrogen. The low temperature fermentation sample was lower than room temperature fermentation sample in pH and amino type nitrogen. The yeast decreased in low temperature fermentation sample taken 15 to 30 days longer than room temperature sample. The yeast is increased up to 30 days, and decreased little by little. After 60 days, it remained a few without effectiveness on the Doenjang quality. The low temperature fermentation sample showed brighter than room temperature fermentation sample. Different fermentation condition affected Doenjnag quality, especially, low temperature fermentation sample showed bright color in Doenjnag. So low temperature fermentation must be expected as good method for getting high quality Doenjnag. 메주를 만들 때 저온숙성의 경우 상온숙성보다 발효 특성과 관련이 있는 pH, 아미노산성 질소 등의 양이 낮았으며 동일한 아미노태 질소 함량에 도달하기까지 숙성기간이 약 2∼3배정도 필요한 것으로 나타났고, 된장의 색상이 약 2배정도 밝은 것으로 나타났다. 그리고 숙성초기 낮은 온도로 인해 산성생균의 활동성이 낮아지고 이로 인한 유기산 생성량이 낮아져 상온숙성 된장에 비해 pH가 높고, acidity I 이 낮으며, 저온숙성된장은 가수분해 효소에 의한 분해속도의 저하로 낮은 아미노산성 질소 함량을 보였다.
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고속 데이터 패킷 전송을 위한 다중경로 간섭제거기의 성능 비교
김규섭,임성빈 崇實大學校 生産技術硏究所 2002 論文集 Vol.32 No.-
One of problems associated with high-speed data packet transmission systems such as HW-CDMA and 1xEVDO in CDMA2000 is that they show seriously low performance for m channels. The main reason for this is that a high-speed data packet transmission system higher-level modulation schemes such as 8PSK, 16QAM and 64QAM, which have relativel Euclidean distance between symbols. Such schemes are very sensitive to interference and/or no purpose of this paper is to compare the performance and complexity of the multipath inte cancellation algorithms for high-speed data packet transmission. The algorithms considered in are MPIC (Multi-Path Interference Cancellation), SWCE (Sliding-Window Chip Equalizer) and I (Iterative Decision Feedback Equalizer with Hard Decision), which are the existing and propos for minimitigating the effect of multipath interference.
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張奎燮,金相達,洪淳根,尹漢敎 한국응용생명화학회 1982 Applied Biological Chemistry (Appl Biol Chem) Vol.25 No.3
密閉式물 交換太陽 熱集熱乾燥製置를 利用하여 紅蔘을 乾燥할때의 集熱效率, 乾燥效率. 乾燥特性 및 製品의 品質을 各各 調査하였다. 乾燥其間은 太陽熱集熱製置를 利用한 것이 慣行法보다 3分의 1程度를 더 短 할 수 있었다. 乾燥其間中集熱機의 最大效率은 14.42% 最低效率은 4.73%였고 乾燥效率은 集熱製置를 利用한 것이 28.34%, 對照區가 13.45%로서 純粹乾燥效率은 14.89%이었다. 紅蔘의 乾燥率曲線은 減率乾燥期만을 나타내었으며, 이 때의 式은 Y=50.7023t.-014138 이었다. 乾燥紅蔘의 色度는 慣行法과 比較하여 더 높았으며, diphenylpicryl hydrazyl 遇元能도 같은 傾向을 보였다. A closed solar collector drying system by water exchange was evaluated for the drying of ginseng. The thermal efficiency of solar collector, drying efficiency, drying characteristics and product quality were investigated. The drying period was reduced by one-thirds in comparison with typical method. The maximum and minimum thermal efficiency of the solar collector during drying period were 14.42%, and 4.73%, respectively. The drying efficiency of solar collector and control system showed 28.34%, and 13.45%, respectively: net drying efficiency being 14.8%. The drying rate curve of red ginseng showed only falling rate period, and its equation was Y=50.7023t.^(-0.4138) The brown color intensity of red ginseng was higher in solar collector drying system than in typical method, and reductivity by diphenyl picryl hydrazil solution in red ginseng extract showed similar result to brown color intensity.
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가시오가피(Acanthopanax senticosus)의 석유에테르 추출물 중 polyacetylene계 물질의 동정
양효진,김은미,장규섭 충남대학교 농업과학연구소 2008 농업과학연구 Vol.35 No.1
This study was conducted to isolate polyacetylenes from the Acanthopanax senticosus and to identify the chemical structure of the polyacetylenes by UV, IR, ¹H-NMR and (13)^C-NMR. One of the liposoluble materials was extracted with petroleum ether. Polyacetylene compounds were collected through solvent fractionation at silica gel column chromatograph. The HPLC was used for the semi-preparative separation IR spectra of fraction 5 showed triple bonds at 2256 cm^(-1) and double bond at 1654cm^(-1), respectively, ¹H-NMR spectra of Fraction 5 showed the double bond at 5.35-5.48 ppm. Triple bond at 64.0. 71.2, 74.2, 80.2 ppm and double bond at 121.89, 133.0 ppm were observed in the (13)^C-NMR spectra. 가시오가피를 실온에서 petroleum ether로 추출한 polyacetylene의 동정하기 위하여 TLC, HPLC, UV spectrum, IR, NMR로 수행하였다. TLC에 전개시킨 결과, polyacetylene 표준품과 동일한 band가 fraction 5에서 확인되었으며, HPLC에서 fraction 5를 분리시킨 결과 retention time이 4.40, 5.36, 6.40분이었다. 이를 UV spectrum에서 확인한 결과, 6.40분의 peak(compound 3)에서 polyacetylenes의 파장인 231.0nm, 239.0nm, 257.0nm을 나타내었다. IR spetrum에서 triple bond 2256cm^(-1)과 double bond1654cm^(-1)의 전형적인 peak를 나타내었으며, (13)^C-NMR(400MHz, CDC1₃)에서 polyacetylenes 전형적인 64.0, 71.2, 74.2, 80.2ppm은 2개의 triple bond에 의한 peak와 121.89, 133.0ppm에서 internal double bond로 결합된 2개의 peak를 확인 할 수 있었다.
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초임계 유체 CO₂를 이용한 강황에서의 Curcumin 추출의 최적화
정승현,장규섭,김영종 한국산업식품공학회 2004 산업 식품공학 Vol.8 No.1
강황의 색소성분 curcuminoid의 주성분인 curcumin은 많은 생리활성이 보고 되고 있으나, 현재 유기 용매를 이용한 추출에 의존하고 있어 안전성이 문제시 된다. 따라서 본 연구는 유기용매에 대한 위험성이 적은 초임계 유체 추출을 통한 강황 중 curcumin 추출의 최적화를 수행하였다. curcumin 추출의 최적 조건을 도출하기 위하여 중심합성법(central composite design)으로 설계된 실험방법으로 반응표면 분석을 실시하였다. 이때 독립변수를 추출온도(X₁), 보조용매유속(X₂), 추출압력(X₃)로 설정하고 curcumin 함량을 종속변수(Y)로 하여 Y=-8.581270+0.220770X₁+1.176731X₂+0.036873X₃+-0.0026816X₁²-0.0000825X₃X₂-0.000096554X₃² 와 같은 회귀식을 도출하였다. 반응표면 분석결과 curcumin 추출량의 최고점은 온도 40.31℃, 압력 231.59bar, 보조용매유속 3.07 ml/min 조건이었고, 이때 curcumin 추출량은 1.9228%였다. Curcumin, the major yellow-colord pigment in turmeric(Curcuma long L.), was extraced by using supercritical carbon dioxide. Opimum extraction conditions were determined. Overall experiments were plaaned by central composite design and result were analyzaed by response surface methodology to find efffect of three independent variables, temperature(X₁), co-solvent flow rate(X₂) and pressire(X₃) on the yield of curcumin extrat(Y). Regression model optimiaed by response surface analusis was as follows Y=-8.581270 + 0.220770X₁+1.176731X₂+0.03683X₃+ -0.0026816X¹₂-0.013010X₂X₁-0.103353X₂²+0.000198X₃X₁-0.0000825X₃X₂-0.000096554X32. Optimum temprature, pressure and so-solvent flow rate for exracting curcumin from turmeric were 40.31℃,3.07㎖/min and 231.59bar, respectively and statistical maximum yield of curcumm was 1.922%.
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