• 수산경영론집
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• 제9권2호
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• pp.45-58
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• 1978

• 생명과학회지
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• 제32권7호
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• pp.523-531
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• 2022

본 연구에서는 한방복합추출물(마황, 창출, 석고, 카카오닙스)을 제조하여, 추출물에 대한 항산화 활성 및 지방세포형성억제 활성을 확인하고자 하였다. 한방복합물의 항산화 활성을 확인하기 위하여 DPPH, ABTS⁺ radical 소거능 및 xanthine oxidase 저해 활성을 측정한 결과 추출물 1,000 ㎍/ml 농도에서 각각 75.0, 100.8 및 79.5%로 높은 소거능을 나타내었다. 3T3-L1 지방전구세포에서 한방복합물에 의한 지방형성 및 지방세포 분화 억제를 조사한 결과 0~50 ㎍/ml 농도에서 3T3-L1 세포 생존율에 영향을 미치지 않았다. 3T3-L1 지방전구세포에서 25, 50 및 75 ㎍/ml의 한방복합물 처리는 농도 의존적으로 지질 축적을 억제하였다. Western blot 실험 결과 한방복합물은 MDI 유도 분화 3T3-L1 세포에서 분화 전사인자인 PPARγ, C/EBPα 을 75 ㎍/ml 농도에서 각 44.2, 76.6% 억제함을 나타내었다. 또한, 지방산 합성 조절 인자인 FAS의 발현도 억제하였다. 이와 같은 결과를 바탕으로 본 연구는 항비만 기능성 소재로서 한방복합추출물의 활용 가능성을 제시해 줄 수 있을 것으로 사료 된다.

• 전기학회논문지
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• 제59권7호
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• pp.1282-1288
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• 2010

This paper proposes a novel microstrip patch antenna to make impedance matching possible by using slot/T-slot capacitive coupling between the patch and 50 $\Omega$ feed line on a ground plane. The single band/linear polarization patch antenna shows linear polarization at 2.4 GHz band. Under -10 dB return loss, the single band/linear polarization patch antenna obtains 50 MHz bandwidth at 2.37 GHz~2.42 GHz. The dual band/dual polarization microstrip patch antenna shows circular polarization at 2.4 GHz band and linear polarization at 3.1 GHz band. Under -10 dB return loss, The dual band/dual polarization microstrip patch antenna obtains 340 MHz bandwidth at 2.23~2.57 GHz and 375 MHz bandwidth at 2.95~3.325 GHz.

• Toxicological Research
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• 제18권3호
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• pp.227-232
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• 2002

In order to find out the appropriate in vitro method for high correlation with in vivo, we com-pared the sensitivities of phototoxicity (PT) in vitro method between in human keratinocytes, HaCaT cells and in 3T3 fibroblast cells derived from Balb/c mice. Both cells were exposed to six known phototoxic chemicals : promethazine, neutral red, chlortetracycline, amiodarone, bithionol, 8-methoxypsoralen, or non-phototoxic chemical, ALS (ammonium laureth sulfate) and then irradiated with 5 J/$cm^2$ of UVA. Cell viability ($IC_{50}$ ) was measured by neutral red uptake (NRU) assay. The ratio of $IC_{50}$ value of chemicals in the presence and absence of UVA was determined by the cut-off value. The phototoxic potential of test chemicals in NRU assay was determined by measuring the photoirriation factor (PIF) with a cut-off value of 5. In both 3T3 and HaCaT cells, all known phototoxic chemicals were positive (over 5 of PIF value), except that bithionol was found to be non-phototoxic to HaCaT cells, and ALS, non-phototoxic chemical was negative. These results suggest that Balb/c 3T3 cell was more sensitive than HaCaT cell to predict phototoxicity potential.

• 상하수도학회지
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• 제13권4호
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• pp.54-61
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• 1999

SBR process used to evaluate the removal of organics, nitrogen and phosphorus on the basis of a report of research on a precedence at various operation cycle and condition change. Effluent concentration of COD were 50mg/l, 50mg/l, 90mg/l respectively, The removal rates of COD were nearly over 95% at Run 1, 2 and 4. But at Run 3, Effluent concentration of COD was 255.0mg/l, The removal rate of COD was 87% at Run 3. As Oxic/Anoxic rate was fixed and operating cycle of Oxic/Anoxic was changed, the removal rates of T-N were 74.7%, 46.9%, 28.5%, 63.3% respectively at Run 1~4. The case of Run 1 was best result. The removal rates of T-P was appeared in proportion to T-N removal rates and rest of $NO_2-N$. The removal rates of T-P were 51.2%, 35.5%, 41.5%, 51.9% respectively. The removal rates of COD, T-N, T-P were influenced on the change of SBR operation cycle. As organic loading rate was $1.43kgCOD/m^3day$ and C/N ratio was 3.0, operation cycle of Run 1 was best condition of T-N removal rates and T-P removal.

• 한국포장학회지
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• 제27권2호
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• pp.85-90
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• 2021

The gamma irradiation was on to Poly(butylene sebacate-co-terephthalate) (PBSeT), Poly(butylene adipate-co-terephthalate) (PBAT), Poly(lactic acid) (PLA) and casting polypropylene (CPP) at dose levels from 0 to 50 kGy. The properties of gamma irradiated samples were analyzed using DSC, TGA, UTM and FT-IR spectra. The mechanical and thermal properties of PBSeT and PBAT after gamma irradiation were less affected than CPP. The tensile strength and elongation of PBSeT was not affected by gamma irradiation, while these of PBAT, PLA and CPP were significantly decreased at 50 kGy gamma-ray dose. The thermal stability of PBSeT, PBAT, PLA and CPP showed a similar tendency to tensile strength. The glass transition temperature(T_g) and melting temperature(T_m) of PBSeT and PBAT were not altered by increasing gamma-ray dose, while these of PLA and CPP decreased. The chemical composition of all samples was not modified by gamma irradiation, and it was confirmed by FT-IR spectra. Based on mechanical and thermal stability studies of gamma irradiation on bioplastics, tested biodegradable packaging materials showed a potential to be used in sterilization process up to 35 kGy.

• Journal of Animal Science and Technology
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• 제47권2호
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• pp.283-292
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• 2005

This study was conducted to determine the effect of dietary supplements of mineral(pegmatite) powder on the growth performance and meat quality during 14 month in 24 heads of Hanwoo steers. The Hanwoo steers were randomly allotted 3 treatments(8 heads I treatment); Control(0 %), Tl(supplemented with pegmatite 2.0% and vitamin A 0.2 %), T2(supplemented with pegmatite 2.0 %). The body weights of control, Tl and T2 were 646.2 kg, 624.0 kg and 656.8 kg on 26 month respectively. The daily gain was higher in T2(0.87 kg) than the others. The concentration of vitamin A(retinol) in the blood serum in T1(61.75 $\ell$ I dl) was higher than' control(41.93$\ell$ I dl) and T2(46.10mg I dl)(P < 0.05). The concentration of total cholesterol was lowest in TI (130.17mgI di) than the others(P< 0.05). Marbling scores and meat quality grade were to significnatly higher in T2(5.50 and 3.50) than control(2.71 and 1.83) and Tl(3.00 and 2.00)(P< 0.05).

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.300-303
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• 1991

Sulphur-hexafluoride has extensively been used as an insulating gas of electric power equipment in substation for its high dielectric strength, non-toixity and non-flammable properties. But it is very expensive and is liquidizable under the condition of low temperature and high pressure. And it is very sensible to the locally high electric field strength. To resolve these problems, we studied 50% FOV and V-t characteristics of $SF_6-N_2$ mixtures under positive and negative lightning impulses using a 25mm rod-plane gap. 50% FOV of $SF_6-N_2$ 50% mixture was about 85% of pure $SF_6$ and it was known that $SF_6-N_2$ mixtures can be used as an economic substitution insulating gas for $SF_6$.

• 대한수학회보
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• 제50권2호
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• pp.399-405
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• 2013

We explicitly construct a thin basis for the set $\mathbf{M}$ of monic polynomials in one variable $t$ over a finite field ${\mathbb{F}}_q$.

• 한국가금학회지
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• 제35권4호
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• pp.375-380
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• 2009

본 시험은 비절식 강제 환우 가 산란계의 장기 비율의 변화 및 혈액 성상에 미치는 영향을 알아보고자 60주령 Leghorn종 400수를 공시하여 34주간 실시하였다. 처리구는 관행적으로 절식한 대조구(C), 옥수수 단일사료 급여(T1), 밀기울 단일 사료 급여(T2) 및 알팔파 단일 사료를 급여(T3)한 4처리로서, 처리구당 5반복, 반복당 20수씩 철제 케이지에 완전임의 배치하였다. 시험결과, 생체중 대비 장기 비율은 환우 개시시 난소는 $2.03{\sim}2.86%$, 난관은 $2.51{\sim}3.47%$로 처리구간에 유의차를 보이지 않았으며, 환우 종료시에는 난소의 경우 $0.25{\sim}0.41%$로서 차이가 없었으나, 난관은 대조구, T1구, T2 구 및 T3구가 각각 1.15%, 0.80%, 0.46% 및 0.89%로서 T2구가 대조구, T3구보다 유의적으로 낮았다(P<0.05). 50% 산란시 난소는 $2.19{\sim}2.60%$, 난관은 $3.00{\sim}3.50%$였으며, 산란피크시에 난소의 경우 2.65{\sim}3.01%, 난관은 $3.25{\sim}3.65%$로서 절식과 비절식에 따른 처리간에 차이가 나타나지 않았다. 혈액성상에서 Cholesterol은 환우 개시시 $179.8{\sim}245.7\;mg/dL$로서 처리간에 차이가 없었고, 환우 종료시에는 대조구 353.6, T1구 229.1, T2구 261.8 및 T3구 300.6 mg/dL로서 T1구가 대조구 및 T3구보다 유의적으로 낮았으며(P<0.05), 시산시에는 $228.1{\sim}271.8\;mg/dL$, 50% 산란시에는 $236.5{\sim}284.8\;mg/dL$로서 처리간에 차이가 없었다. 산란 피크시에는 대조구, T1구, T2구 및 T3구가 각각 324.1, 591.6, 363.0 및 315.6 mg/dL로서 T1구가 다른 처리구에 비하여 유의적으로 높았다(P<0.05).