• Journal of the Korean Applied Science and Technology
• /
• v.22 no.4
• /
• pp.339-348
• /
• 2005

On the analysis of triacylglycerol (TG) from the kernels of Acanthopanax sessiliflorus by reversed phase-HPLC, it was separated into three main fractions of PN 44, 46 and 48, according to partition number (PN). On the contrary, it could be clearly classified into seven fractions of SMM, MMM, SMD, MMD, SDD, MDD and MDT by silver ion-HPLC by the number of double bond in the acyl chains of TG species. But resolution of so-called critical pairs of TG molecular species such as molecular pairs of $P_eLL$ $[C_{18:1{\omega}12}/(C_{18:2{\omega}6)2}]$ and OLL $[C_{18:1{\omega}9}/(C_{18:2{\omega}6)2}]$ and OOL $[(C_{18:1{\omega}9)2}/C_{18:2{\omega}6]$, and $P_eP_eL$ $[(C_{18:2{\omega}12)2}/C_{18:1{\omega}6]$ was not achieved $(P_e;$ petroselinic acid, L; linoleic acid, O; oleic acid). On the other hand, TG extracted from Aralia continentalis kernels were also fractionated into seven groups of SSM, SMM, MMM, SMD, MMD, SDD and MDD (S; saturated acid, M; monoenoic acid, D; dienoic acid) by silver ion-HPLC, although it's were classified into three groups of PN 44, 46 and 48 by reversed phase-HPLC. The fractions of SMM, MMM, MMD and MDD were divided into two subfractions, respectively; the fractions of SMM, MMM, MMD and MDD were resolved into the subfraction of $PP_e/P_e$ and POO (critical pairs from each other), that of $P_e/P_e/P_e$ and OOO, that of $P_e/P_e/L$ and OOL, and that of $P_e/L/L$ and OLL.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.22 no.2
• /
• pp.102-108
• /
• 1989

The effects of n 3 polyunsaturated fatty acid (PUFA) on protein and phospholipid con-tents, and cholesterol level were studied in rats fed with diets of different fat composition. Body weights of fish oil groups were decreased to $11.1\%\~14.4\%$ compared with lard group (control), and also $16.4\%\~23.3\%$ compared with corn oil group, respectively. Protein contents of $\omega3$ PUFA and sardine oil groups in liver were increased to $6.78\%\~8.51\%$ compared with control group, but were no significant difference in brain and serum. $\omega3$ PUFA and sardine oil slightly repressed the phospholipid in microsome of liver. Moreover they effectively reduced the serum cholesterol levels compared with control group.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
• /
• v.7 no.1
• /
• pp.40-44
• /
• 2014

A bridge resistance deviation-to-period (BRD-to-P) converter is presented for interfacing resistive biosensors. It consists of a linear operational transconductance amplifier (OTA) and a current-controlled oscillator (CCO) formed by a current-tunable Schmitt trigger and an integrator. The free running period of the converter is 1.824 ms when the bridge offset resistance is $1k{\Omega}$. The conversion sensitivity of the converter amounts to $3.814ms/{\Omega}$ over the resistance deviation range of $0-1.2{\Omega}$. The linearity error of the conversion characteristic is less than ${\pm}0.004%$.

• Korean Journal of Materials Research
• /
• v.20 no.3
• /
• pp.161-166
• /
• 2010

The ac, dc conductivity and dielectric properties of $DyCoO_3$ were reported in the temperature range of 77 - 300K and in the frequency range of 20 Hz - 100 kHz. It was observed that at low temperature, ac conductivity is much higher than dc conductivity and the hopping carrier between localized states near the Fermi level was the dominant loss mechanism. A comparison of the measured ac conductivity $\sigma(\omega)$ was made with some of the models of hopping conductivity of the proposed earlier in the literature. It was observed that in $DyCoO_3$ the measured ac conductivity, over the entire frequency and temperature region, can be explained reasonably well by assuming two contributions $\sigma_1(\omega)$ and $\sigma_2(\omega)$ to the measured $\sigma(\omega)$. The first, $\sigma_1(\omega)$, which dominates at low temperature, may be due to impurity conduction in a small polaron; the second, $\sigma_2(\omega)$, which dominates at higher temperatures, depending on the frequency of measurements, may be due to the hopping of a small polaron and is reasonable for the dielectric relaxation peak.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
• /
• v.27 no.1
• /
• pp.31-38
• /
• 2016

Pharmacotherapy is considered the first line therapy in attention-deficit hyperactivity disorder (ADHD). Many patients also choose complementary medicine such as dietary supplements. Omega-3 has shown some efficacy for improving ADHD symptoms in several studies. The goal of this review is to integrate the previous research findings on omega-3 and understand the issues worth considering in the treatment of ADHD. The terms "attention deficit disorder with hyperactivity", "omega-3", and "dietary supplements" were searched on PubMed, Cochrane, and Google scholar. The search was further limited to clinical trials, reviews, and meta-analyses. Trials that examined treatments for ADHD, used randomized design, and placebo-controlled trials were included. Eighteen clinical trials with a total of 1,141 participants were included in this review. Fifteen trials had parallel designs, comparing an omega-3/6 polyunsaturated fatty acid (PUFAs) or a combination of both to a placebo and three compared omega-3/6 PUFAs to a placebo and psycho-stimulants. Seven of the included trials showed significant improvements in groups receiving omega-3/6 PUFAs compared to placebo groups, however, 11 trials showed no significant differences. Evidence that PUFAs supplementation provides benefits for ADHD was yet limited. Mixed results were due to selection variability criteria, variability of supplementation, and short follow-up intervals.

• Journal of applied mathematics & informatics
• /
• v.32 no.1_2
• /
• pp.113-128
• /
• 2014

Consider a class of p(x)-Kirchhoff type equations of the form $$\left\{-M\left({\int}_{\Omega}\;\frac{1}{p(x)}{\mid}{\nabla}u{\mid}^{p(x)}\;dx\right)\;div\;({\mid}{\nabla}u{\mid}^{p(x)-2}{\nabla}u)={\lambda}V(x){\mid}u{\mid}^{q(x)-2}u\;in\;{\Omega},\\u=0\;on\;{\partial}{\Omega},$$ where p(x), $q(x){\in}C({\bar{\Omega}})$ with 1 < $p^-\;:=inf_{\Omega}\;p(x){\leq}p^+\;:=sup_{\Omega}p(x)$ < N, $M:{\mathbb{R}}^+{\rightarrow}{\mathbb{R}}^+$ is a continuous function that may be degenerate at zero, ${\lambda}$ is a positive parameter. Using variational method, we obtain some existence and multiplicity results for such problem in two cases when the weight function V (x) may change sign or not.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2012.08a
• /
• pp.264-264
• /
• 2012

자화된 플라즈마 매질 내부에 진행하는 전자기파중에서 ${\omega}_{ci}$ ${\ll}({\omega}_{ci}{\omega}_{ce})_{1/2}{\ll}{\omega}{\ll}{\omega}_{ce}{\ll}{\omega}_{pe}$의 주파수 대역을 사용하여 헬리콘 방전을 발생시킨다. 수 kW의 RF 출력을 사용하는 헬리콘 플라즈마원은 자기장, 중성가스 압력 및 RF 주파수 등을 포함한 방전 조건에 따라 급격하게 플라즈마 밀도가 증가하고, 유사한 플라즈마 발생원에 비하여 높은 효율을 가진다. 이러한 헬리콘 플라즈마가 높은 이온화 효율을 갖는 원인을 알아보기 위해 반사계로 플라즈마 밀도를 측정하였다. 본 연구에서는 helical 타입의 안텐를 이용하여 직경 15 cm pyrex관 내부에 플라즈마를 발생시켰고, 플라즈마 진단을 위해 33~40 GHz의 주파수로 FMCW방식을 이용한 반사계로 플라즈마 밀도를 측정하였다.

• Bulletin of the Korean Mathematical Society
• /
• v.50 no.4
• /
• pp.1235-1242
• /
• 2013

We give area and height estimates for cmc-graphs over a bounded planar $C^{2,{\alpha}}$ domain ${\Omega}{\subset}\mathbb{R}^3$. For a constant H satisfying $H^2{\mid}{\Omega}{\mid}{\leq}9{\pi}/16$, we show that the height $h$ of H-graphs over ${\Omega}$ with vanishing boundary satisfies ${\mid}h{\mid}$ < $(\tilde{r}/2{\pi})H{\mid}{\Omega}{\mid}$, where $\tilde{r}$ is the middle zero of $(x-1)(H^2{\mid}{\Omega}{\mid}(x+2)^2-9{\pi}(x-1))$. We use this height estimate to prove the following existence result for cmc H-graphs: for a constant H satisfying $H^2{\mid}{\Omega}{\mid}$ < $(\sqrt{297}-13){\pi}/8$, there exists an H-graph with vanishing boundary.

• Bulletin of the Korean Mathematical Society
• /
• v.38 no.3
• /
• pp.487-493
• /
• 2001

$Let \Omega$ be a bounded convex domain in C^n$ with smooth boundary. Let M be a subvariety of $\Omega$ which intersects $\partial$$\Omega$ transversally. Suppose that $\Omega$ is totally convex at any point of $\partial$M in the complex tangential directions.For f $\epsilon$O(M)$\bigcap$/TEX>$C^{\infty}$($\overline{M}$/TEX>), there exists F $\epsilon$ o ($\Omega$))$\bigcap$/TEX>$C^{\infty}$($\overline{\Omega}$/TEX>) such that F(z) = f(z) for z $\epsilon$ M.

• Journal of the Korean Chemical Society
• /
• v.39 no.5
• /
• pp.414-420
• /
• 1995

$\alpha$-Bromo-$\omega$-fluoroalkanes are synthesized in 19∼55% yields from the reactions of dibromoalkanes with AgF and TBABr in acetonitrile at $82^{\circ}C$ for 20 minutes. The reaction is monitored with gas-chromatography. 1^H$ NMR and $19^F$ NMR-Spectrometer are used for identification of $\alpha$-Bromo-$\omega$-fluoroalkanes, difluoroalkane, fluoroalken and bromoalkene.