• Korean Journal of Mathematics
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• 제30권1호
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• pp.147-154
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• 2022

In this article, we prove that an absolutely summing operator on 𝓛^λ₁ spaces has a lifting under the conditions that a target Banach space is a quotient of reflexive Banach subspaces.

• 대한본초학회지
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• 제24권2호
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• pp.39-48
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• 2009

Objectives : To clarify the possible effect of JS (Juglans sinensis), PCF (Psoralea corylifolia L.), and J+P(JS+PCF), we examined their influence on the development of pulmonary eosinophilic inflammation in the asthmatic murine model. Methods : All mice were immunized on two different days (21 days and 7 days before inhalational exposure) by intraperitonial injections of 0.2 ml alum-precipitated Ag containing 100 ${\mu}$g of OVA bound to 4 mg of aluminum hydroxide in PBS. Seven days after the second sensitization, mice were exposed to aerosolized ovalbumin for 30 minutes/day on 3 days/week for 8 weeks (at a flow rate of 250 L/min, 2.5% ovalbumin in normal saline) and, JS, PCF and J+P (200 mg/kg, 400 mg/kg) were orally administered 3 times per week for 8 weeks. Results : The suppressive effects of JS, PCF, and J+P were demonstrated by the accumulation of eosinophils into airways, with the reduction of eosinophils and lung leukocytes. These were correlated with the marked reduction of IL-4, IL-5, IL-13 levels in the BALF and serum. OVA-specific IgE levels were also decreased in serum and BAL from these mice. And also JS, PCF, and J+P decreased eosinophilic CCR3 and CD11b expression in lung tissue. Conclusions : These results indicate that JS, PCF, and J+P have deep inhibitory effects on airway inflammation and hyper-responsiveness in the asthmatic murine model. The suppression of IL-5, IgE, and eosinophilils and the increase of IFN-${\gamma}$ production in BALF seem to contribute to these effects. Specially, esosinophils and TNF-a in J+P combination group were significantly reduced in BALF and lung tissue. Hence, the results indicated that JS, PCF, and J+P could act as an immuno-modulator which possesses anti-inflammatory and anti-asthmatic property by modulating the imbalance between Th1 and Th2 cytokines.

• Bulletin of the Korean Chemical Society
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• 제34권1호
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• pp.128-132
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• 2013

L-Arginine semi-oxalate (LASO) single crystal has been grown by solution growth technique at room temperature. The crystal structure and lattice parameters were determined for the grown crystal by single crystal X-ray diffraction studies. Photoluminescence studies confirm the violet fluorescence emission peak at 395 nm. Optical constants like band gap, refractive index, reflectance, extinction coefficient and electric susceptibility were determined from UV-VIS-NIR spectrum. The dielectric constant, dielectric loss and ac conductivity of the compound were calculated at different temperatures and frequencies to analyze the electrical properties. The solid state parameters such as plasma energy, Penn gap, Fermi energy and polarizability were calculated to analyze second harmonic generation (SHG). Nonlinear optical property was discussed to confirm the SHG efficiency of the grown crystal.

• Journal of Animal Science and Technology
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• 제62권6호
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• pp.854-863
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• 2020

This study was aimed to investigate the inhibitory effects of Porphyra dentata (P. dentata) extract on the adipogenesis of 3T3-L1 cells and evaluate its anti-obesity effect. The proliferation of 3T3-L1 cells and differentiation of adipocytes under treatment of P. dentata extract was examined by measuring the cell viability using alamarBlue assay and lipid droplets by Oil Red O staining. Results showed that P. dentata extract has no cytotoxicity effect and lipid droplets formation decreased in a concentration-dependent manner in 3T3-L1 cells. It has been confirmed that transcription factors affecting lipid accumulation and anti-adipogenic effects during cell differentiation are linked to P. dentata extract. We observed that P. dentata shows lowering the mRNA expression of peroxisome proliferator-activated receptor γ2 (PPARγ2), CCAAT/enhancer binding protein α (C/EBPα) that adipogenesis-associated key transcription factors and inhibiting adipogenesis in the early stages of differentiation. Treating the cells with P. dentata did not only suppressed PPARγ2 and C/EBPα but also significantly decreased the mRNA expression of adiponectin, Leptin, fatty acid synthase, adipocyte protein 2, and Acetyl-coA carboxylase 1. Overall, the P. dentata extract demonstrated inhibitory property in adipogenesis, which has a potential effect in anti-obesity in 3T3-L1 cells.

• 한국미생물·생명공학회지
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• 제35권2호
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• pp.98-103
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• 2007

산란계의 분변으로부터 생균제 특성을 가진 유산균을 분리하기 위하여, 무작위 선발법과 agar well diffusion assay법을 사용하여 다수의 유산균을 1차 선발하였으며 이 중에서 대장균 억제능이 가장 우수한 CPM-7 균주를 분리하였다. 최종 선발된 CPM-7 균주는 형태학적 특징, 당 이용성 및 16S rRNA 서별 분석을 통하여 Lactobacillus salivarius CPM-7으로 동정되었다. L. salivarius CPM-7은 내산성 및 내담즙성이 우수한 것으로 나타났는데, pH 2에서 30분 동안 및 pH 3에서 6시간 동안 생균수가 거의 유지되었으며, bile salt 0.2%가 첨가된 MRS 배지에서 증식할 수 있었다. L. salivarius CPM-7은 a-galactosidase를 포함한 다수의 효소를 생산하는 것으로 확인되었으며, 돼지의 장 상피세포에 흡착할 수 있었다. L. salivarius CPM-7의 배양액 및 중화액은 자돈 설사를 유발하는 것으로 알려진 E. coli K88에 대한 강력한 억제능을 나타내었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 C
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• pp.909-911
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• 1999

Metalization technology of the fine patterns by electroless plating is required in place of electrodeposition as high-density printed circuit boards (PCB) become indispensable with the miniaturization of electronic components. Electroless nickel plating is a suitable diffusion barrier between conductor metals, such as Al and Cu, and solder is essetional in electronic packaging in order to sustain a long period of service. Moreover, Electroless nickel has particular characteristics including non-magnetic property, amorphous structure, wear resistance, corrosion protection and thermal stability. In this study fundamental aspects of electroless nickel deposition were studied with effect of complexeing agents of different kinds. Then, the property of electroless deposit are controlled by the composition of the deposition solution, the deposition condition such as temperature and pH value and so on. the characteristics of the deposits has been carried out.

• 대한환경공학회지
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• 제34권1호
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• pp.42-48
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• 2012

본 연구에서는 미세기포 액막화 부상조를 이용하여 인 제거에 관한 연구를 실시하였다. 미세기포 액막화 부상조는 기체용해탱크를 이용하여 부상 전 기 액을 충분히 용해시킨 후 일정한 저 압력으로 동일한 미세기포를 생성하도록 하는 방법을 사용하였다. $A_2O$ 공정과 m-$O_3$(미세기포 생성장치와 오존용해탱크가 결합된 공정)복합공정을 거친 2차 유출수를 인 제거 공정의 유입수로 사용하였으며, 원수의 T-P 농도가 2.89 mg/L일 때, 8%의 Alum을 30 mg/L의 농도로 주입하였을 경우 T-P 제거율이 94%를 나타내었고, T-P의 방류수수질기준인 0.2 mg/L 이하를 만족시키는 것으로 조사되었으며, 계절에 따른 수온 변화는 T-P 제거 특성에 영향을 주지 않았다. SS의 유입농도가 1.0 mg/L 이상일 시 SS가 응집공정 내의 seed 역할을 하여 평균 T-P의 제거율이 97% 이상 되는 것으로 조사되었고, 부상스컴을 50% 반송할 경우, 부상스컴 내에 포함되어 있는 응집제 성분 Al이 주입되는 응집제의 역할을 보조하여 오염물질의 응집효율을 극대화 시키는 것으로 조사되었다. 이러한 조건에서 T-P의 방류수 수질기준 0.2 mg/L 이하를 만족하는 0.18 mg/L의 농도를 나타내는 것으로 조사되었다.

• 산업기술연구
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• 제20권A호
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• pp.39-44
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• 2000

Highly viscous biopolymer from alkali-tolerant Bacillus sp. was purified and its solution properties were investigated. The intrinsic viscosities for crude biopolymer and biopolymers purified by dialysis or CPC(cetylpyridinium chloride) treatment were 58.24, 73.60 and 42.18 dL/g, respectively. The intrinsic viscosity of biopolymer showed the maximum value at the neutral pH but it was decreased remarkably at the alkaline or acidic pH. Biopolymer exhibited the property of polyelectrolyte, showing the sharp decrease of intrinsic viscosity by the addition of NaCl. Intrinsic viscosity of dilute solution at the low NaCl concentration was exponentially dependent on temperature and its temperature dependency was increased with NaCl concentrations. The chain stiffness, coil overlap parameter, and critical concentration were 0.09, 5.25 and 0.07g/dL, respectively. Temperature dependency on intrinsic viscosity of biopolymer solution was different each other at $45^{\circ}C$. Flow activation energies at temperatures above $45^{\circ}C$ were constant, while those at temperatures below $45^{\circ}C$ increased with increase of added NaCl concentration.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2006년도 총회 및 춘계학술발표회
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• pp.216-219
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• 2006

Water retention curve (WRC), one of soil hydraulic properties, is often approximated by property-transfer models (PTMs). Using the PTMs, we can estimate the WRCs from other physical properties such as particle-size distribution (PSD). The objective of this work was to investigate the performance of two PTMs with different origins for numerical simulations on transport of Benzo[a]pyrene in a soil. To do this, we chose both PTMs with different origins, i.e., (1) the lognormal distribution model (L anti NL models), and (2) the modified $Kov\'{a}cs$ model (MK model). The MK model showed tile worse performance in estimation of the WRCs. When transport of B[a]P was simulated, the MK model predicted to move farther than the L and NL models did, indicating that transport of B[a]P in a soil can be greatly influenced by the choice of PTMs.

• Korean Journal of Mathematics
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• 제22권1호
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• pp.29-36
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• 2014

The limiting diffusion of special diploid model can be defined as a discrete generator for the rescaled Markov chain. Choi([2]) defined the operator of projection $S_t$ on limiting diffusion and new measure $dQ=S_tdP$. and showed the martingale property on this operator and measure. Let $P_{\rho}$ be the unique solution of the martingale problem for $\mathcal{L}_0$ starting at ${\rho}$ and ${\pi}_1,{\pi}_2,{\cdots},{\pi}_n$ the projection of $E^n$ on $x_1,x_2,{\cdots},x_n$. In this note we define $$dQ_{\rho}=S_tdP_{\rho}$$ and show that $Q_{\rho}$ solves the martingale problem for $\mathcal{L}_{\pi}$ starting at ${\rho}$.