• Food Science and Preservation
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• v.22 no.5
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• pp.708-713
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• 2015

To provide the basic data to dry vegetate the sweetpotato leaves, the total contents of tannin, flavonoid and polyphenol in the methanol extract from the hot-air dried sweetpotato leaves were analyzed and DPPH radical scavenging activity, ABTS radical scavenging ability, nitrite scavenging ability, and others were comparatively analyzed. The total tannin content was decreased from Shinmi of 10.87 mg/g at $40^{\circ}C$ to 7.28 mg/g at $70^{\circ}C$ and the total flavonoid was decreased from Hayanmi of 55.37 mg/g at $40^{\circ}C$ to 39.63 mg/g at $70^{\circ}C$. That is, the low temperature drying contained more of these substances than in the high temperature drying. The DPPH radical scavenging activity was the highest in Shinmi and Hayanmi of 84.33% and 85.25% at $40^{\circ}C$, and the ABTS radical scavenging ability was a high value of over 80% in the treatment plot at $40^{\circ}C$. The nitrite scavenging ability was highest in Shinmi and Hayanmi of 76.15% and 73.74% at $40^{\circ}C$ but low at $70^{\circ}C$. That is, the antioxidant effect of the hot-air dried sweetpotato leaves was high in the sample of $40^{\circ}C$ and low in the sample of $70^{\circ}C$. Affected by the drying temperature, the high antioxidant effect is resulting from the little decrease of active ingredient when drying at low temperatures.

• The Bulletin of The Korean Astronomical Society
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• v.24 no.2
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• pp.40-40
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• 1999

• The Bulletin of The Korean Astronomical Society
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• v.26 no.2
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• pp.40-40
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• 2001

• 한국초전도학회:학술대회논문집
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• v.12
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• pp.40-40
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• 2002

• 대한생식의학회:학술대회논문집
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• 1999.11a
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• pp.40.1-40.1
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• 1999

• Bulletin of the Korean Space Science Society
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• 2009.04a
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• pp.40.1-40.1
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• 2009

• Journal of Aquaculture
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• v.14 no.3
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• pp.197-203
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• 2001

To replace fish meal (FM) in the diet of Nile tilapia, Oreochromis nloticus, different levels of Iysine cell mass (LCM) were added to diet on protein equivalent base. fish averaging 3.0 g fed one of nine diets containing isonitrogenous and isocaloric basis of 35% crude protein and 15.3kJ available energy/g diet: $LCM_0, 100% FM: LCM_{10}, 90% FM+10% LCM, LCM_{20}, 80% FM+20% LCM; LCM_{30}, 70% FM+30% LCM; LCM_{40}, 60% FM+40% LCM; LCM_{30}l, 70% FM+30% LCM+lysine; LCM_{30}ln, 70% FM +30% LCM + lysine +NaOH; LCM_{40}lan, 60% FM+40% LCM+lysine+arginine; LCM_{40}/lan, 60% FM+40% LCM+lysine+arginine+NaOH.$. After 8 weeks of feeding trial, there were no significant differences in weight gain (WG) and specific growth rate (SGR) among fish fed LCM$_{0}$ (control diet), LCM_{10}, LCM_{30}, LCM_{40}, LCM_{30}l, LCM_{30}ln, LCA_{40}la and LCM_{40}lan diets (P>0.05)$, while fishes fed $LCM_{20} diet were significantly higher than those fed LCM_{0}, LCM_{30}, LCM_{40}, LCM_{40}la and LCM_{40$}lan diets (P<0.05). There were no significant differences in feed efficiency (FE) and protein efficiency ratio (PER) among fish fed control diet, $LCM_{10}, LCM_{20}, LCM_{30}ln, LCM_{ 40}la and LCM_{40}$lan diets (P>0.05), while fishes fed control diet were significantly higher than those fed $LCM_{30}, LCM_{40} and LCM_{40}l diets (P<0.05)$. Positive effects were not shown in WG and SGR with supplementation of amino acids (lysine & arginine) and neutralizatio, while FE and PER from fish fed $LCM_{40}la and LCM_{40}lan diets were significantly higher than those fed LCM_{30}, LCM_{40} and LCM_{30}$l diets (P<0.05). Hence, LCM can replace FM up to 40%, and dietary suppl-ementacon and neutralization of amino acids showed positive effects, when FE and PER were considered in juvenile tilapia diet.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3178-3180
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• 1999

초음파 진단기의 신호처리에 필요한 8-b 해상도와 40MS/s 이상의 변환속도를 갖는 ADC를 Folding and Interpolating 형태로 설계했다. 전력소모와 입력단의 오프셋에 의한 영향을 줄이기 위해 프리엠프의 출력을 Interpolation하여 그 개수를 절반으로 줄임으로써 전력소모를 줄였고, 기존의 전압모드 Interpolation 회로에서의 단순한 source follower를 정궤환을 이용한 버퍼의 형태로 바꾸어 이득을 개선시킴으로써 전압의 이용율을 높일 수 있었다. ADC에서 가장 중요한 비교기를 설계함에 있어서는 다이나믹 전력 소모만 있는 구조에 킥-백 노이즈를 줄이기 위한 설계를 했다 $0.6{\mu}m$ CMOS 공정을 이용해 설계되었고, Layout 결과 칩의 면적은 $1.3mm{\times}1.3mm$. 모의 실험결과 40MS/s에서 70mw의 전력을 소모하였다.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.1915-1917
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• 2005

PZT(40/60) and PZT(60/40) powders, prepared by the sol-gel method, were mixed with an organic vehicle and the PZT(40/60)/PZT(60/40) heterolayered thick films were fabricated by the screen-printing method on $Pt/Al_2O_3$ substrates. The structural properties such as DTA, X-ray diffraction and microstructure, were examined as a function of the applied pressure. In the DTA analysis, the formation of the polycrystalline perovskite phase was observed at around $880^{\circ}C$. The average thickness of the PZT heterolayered thick films which were coated five times was approximately $95-100{\mu}m$.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2714-2716
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• 2003

대역확산기술의 하나인 Chirp 방식을 이용하여 기존의 전력선 통신모뎀 보다 고속 전송이 가능한 40kbps급 협대역 전력선 통신모뎀을 구현하였다. 본 연구에서 구현한 모뎀은 CEBus 규격을 사용하였으며, $100{\sim}380kHz$의 선형 가변 주파수 신호가 25us 동안 지속한 심볼을 사용하였다. 그리고 구현된 모뎀의 무부하 선로, 각종 부하 및 잡음환경에서의 특성실험 결과, Chirp 방식의 통신기술이 협대역에서 40kbps 이상의 속도를 낼 수 있는 가능성을 확인하였다.