• Communications for Statistical Applications and Methods
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• 제13권2호
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• pp.309-318
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• 2006

There are many statistical methods of testing the equality of two population variances. Among them, the well-known F test is very sensitive to the normality assumption. Several other tests that do not assume normality have been proposed, but these tests usually need tables of critical values or software for hypotheses testing. McGrath and Yeh (2005) suggested a quick and compact Count Five test requiring only the calculation of the number of extreme points. Since the Count Five test uses only extreme values, this discards some information from the samples, often resulting in a degradation in power. In this paper, an alternative Count Five test using the trimmed mean is proposed and its properties are discussed for some distributions and normal mixtures.

• 한국세라믹학회지
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• 제50권4호
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• pp.275-279
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• 2013

The purpose of this study was to prepare calcium phosphate cement [CPC] for use in artificial bone. Nano-crystalline calcium phosphate [CaP] was precipitated at $37^{\circ}C$ using highly active $Ca(OH)_2$ in DI water and an aqueous solution of $H_3PO_4$. From the XRD measurements, the nano-CaP powder was close to apatitic TCP phase and the powders fired at $800^{\circ}C$ showed a critical ${\beta}$-TCP phase. A mixture of one mole $CaCO_3$ and two moles di-calcium phosphate was calcined at $1100^{\circ}C$ to make a reference ${\beta}$-TCP material. The nano-CaP powders were added to the normal ${\beta}$-TCP matrix and fired at $900^{\circ}C$ to make a ${\beta}$-TCP block. The sintered block showed improved mechanical strength, which was caused by the solid state interaction between nano-CaP and normal ${\beta}$-TCP.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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• pp.86.2-87
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• 2003

Introduction: Liver fibrosis is defined unbalance of collagen metabolism, especially a stimulation of collagen synthesis and inhibition of collagen degradation, and antifibrotic effect is delaying or inhibition of new collagen synthesis and deposition in liver tissue. In this study, we investigated the antifibrotic and antioxidative effect of Solanum lycopersicum (SL) in liver fibrosis induced rats. Methods: : Rats were randomly divided in three groups (normal, CCl$_4$ and CCl$_4$-SL group) and were received 0.6 ml mixture of CCl$_4$ and olived oil (1:1 v/v) 3 times/week for 4 weeks except of the normal group. (omitted)

• 한국도로학회논문집
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• 제18권6호
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• pp.123-130
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• 2016

OBJECTIVES : The objective of this research is to determine the moisture resistance of the freeze-thaw process occurring in low-noise porous pavement using either hydrated-lime or anti-freezing agent. Various additives were applied to low-noise porous asphalt, which is actively paved in South Korea, to overcome its disadvantages. Moreover, the optimum contents of hydrated-lime and anti-freezing agent and behavior properties of low-noise porous asphalt layer are determined using dynamic moduli via the freeze-thaw test. METHODS : The low-noise porous asphalt mixtures were made using gyratory compacters to investigate its properties with either hydrated-lime or anti-freezing agent. To determine the dynamic moduli of each mixture, impact resonance test was conducted. The applied standard for the freeze-thaw test of asphalt mixture is ASTM D 6857. The freeze-thaw and impact resonance tests were performed twice at each stage. The behavior properties were defined using finite element method, which was performed using the dynamic modulus data obtained from the freeze-thaw test and resonance frequencies obtained from non-destructive impact test. RESULTS : The results show that the coherence and strength of the low-noise porous asphalt mixture decreased continuously with the increase in the temperature of the mixture. The dynamic modulus of the normal low-noise porous asphalt mixture dramatically decreased after one cycle of freezing and thawing stages, which is more than that of other mixtures containing additives. The damage rate was higher when the freeze-thaw test was repeated. CONCLUSIONS : From the root mean squared error (RMSE) and mean percentage error (MPE) analyses, the addition rates of 1.5% hydrated-lime and 0.5% anti-freezing agent resulted in the strongest mixture having the highest moisture resistance compared to other specimens with each additive in 1 cycle freeze-thaw test. Moreover, the freeze-thaw resistance significantly improved when a hydrated-lime content of 0.5% was applied for the two cycles of the freeze-thaw test. Hence, the optimum contents of both hydrated-lime and anti-freezing agent are 0.5%.

• Journal of Nutrition and Health
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• 제57권4호
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• pp.389-402
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• 2024

본 연구는 고구마와 참마 추출 혼합물의 항산화능을 평가하였으며, 에탄올로 유도된 급성 위염 동물모델에서 HCl/ethanol로 유도된 위염 억제 효과 여부를 검증하였다. 총 폴리페놀 및 총 플라보노이드 함량, DPPH 및 ABTS 라디칼 소거활성은 고구마나 참마의 단독 사용보다 추출 혼합물에서 높았다. 알코올성 급성 위염에 있어서도 단독 사용보다 추출 혼합물이 임상적 행동 점수 및 위액량, 위 점막 손상면적, TNF-α 수치 등에서 유의적인 감소를 확인하였다. 이러한 결과는 고구마와 참마 추출 혼합물이 항산화능이 뛰어나며 위 점막 보호 효과가 있음을 확인할 수 있었다. 따라서 고구마와 참마 추출 혼합물은 알코올성 급성 위염에 있어 위 보호효과를 기대할 수 있으며, 지역 소재의 기능성 발굴에 가능성이 있음을 시사한다.

• 대한본초학회지
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• 제24권4호
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• pp.25-30
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• 2009

Objectives : In order to evaluate the effect of Samguiyong-tang (SGYT) on diabetes, we prepared two types of Samguiyong-tang (Type-I and -II) which was composed of three kinds of oriental drug such as Ginseng, Angelica gigantis radix and Deer antler. Type I was traditional hot-water extract prepared from three kinds of drug, and Type II was the mixture of ethanol-extract of ginseng and hot-water extract prepared from the other two drugs. Methods : We tested the effects of SGYT on the blood glucose levels in normal rats by the method of glucose tolerance test. And also examined the effects of SGYT on the levels in normal rats or diabetic rats induced by Streptozotocin during 20 days. Results : 1. In the course of oral glucose tolerance test, the blood glucose level decreased by administration of SGYT I or II in normal rats. 2. In the course administration of SGYT during 20 days in normal rats, the blood glucose levels decreased until day 4 by Type I or Type II, but thereafter the level was recovered to the normal. 3. In the course administration of SGYT during 20 days in the diabetic rats induced by streptozotocin, Type I (SGYT) had some effect on the blood glucose levels only at 12 day, and Type II (SGYT) decreased the levels from 6th day and so on, significantly. Conclusions : The results suggested that SGYT II had some decreasing effects on the blood glucose levels in diabetic rats induced by Streptozotocin.

• Journal of the Korean Data and Information Science Society
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• 제22권3호
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• pp.459-466
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• 2011

본 논문은 독립적으로 수행된 연구결과를 합쳐서 일반적인 결론을 도출하는 메타분석을 위한 로버스트 계층적 베이지안 모형을 고려한다. 사전정보가 정규분포를 따른다는 가정 대신 정규분포의 척도혼합을 사용하여 정규분포보다 더 두꺼운 꼬리를 가지는 사전분포를 사용한다. 나아가 개별 분석의 분산이 알려져 있지 않은 경우를 계층적 베이지안 모형에 포함하여 메타분석을 수행하고자 한다. 깁스 표집을 사용하여 추정값을 계산하고, 실제 자료를 사용하여 제안된 방법을 예시한다.

• Journal of Plant Biotechnology
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• 제36권2호
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• pp.170-173
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• 2009

Leaf and petiole explants of Pulsatilla koreana NAKAI were cultured on MS medium supplemented with various concentrations of zeatin, kinetin or BAP combined with 0.05 mg/L IAA. After 6 weeks of culture, effects of cytokinin on adventitious shoot formation from explants were investigated. The highest frequency of shoot formation was obtained when petiole explants were cultured on medium with 0.5 mg/L zeatin and 0.05 mg/L IAA. Regenerated shoot were transferred on to root induction medium. The best root formation was observed at 1/2 MS medium with 1.5 mg/L NAA. Rooted plantlets were transplanted to a mixture of perlit and soil (1:3), where they were successfully acclimatized.

• 한국산업보건학회지
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• 제24권3호
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• pp.353-358
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• 2014

Purpose: This study was conducted to evaluate desorption efficiency and storage stability on activated carbon acquired form domestic market. Materials: Mixture of acetone, benzene, normal hexane and toluene was injected on four types of charcoal 100 mg. After overnight, charcoal was desorbed by carbon disulfide $1m{\ell}$ and analyzed by gas chromatography with flame ionization detector. Results: Desorption efficiency of benzene, normal hexane and toluene in charcoal tubes were 95% ~ 105%. But desorption efficiency of acetone in charcoal tubes was below 75% and different from types of charcoal. The more injected amount of acetone on charcoal showed higher desorption efficiency. Acetone injected on charcoal tubes migrated from front section into back section after 10 days storage at room temperature. Conclusions: Desorption efficiency and storage stability of activated carbon acquired from domestic market was good for benzene, normal hexane and toluene. The activated carbon acquired from domestic market has ability to be used as sampling media.

• 한국임상수의학회지
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• 제25권5호
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• pp.411-414
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• 2008

This report described a severe bilateral microphthalmia in a young Holstein calf. The anomalous calf with wry tail showed normal vigor, appetite and normal body weight except for eye defect. The orbits were shallower and smaller than normal. The orbit bilaterally contained a white small mass suspected as eyeball. A spot-like remnant of eyeball (REB) was buried in the mixture of vestigial extraocular muscles and adipose tissue of the bilateral orbit. Histologically, the REB was composed of irregularly arranged elements of ocular wall such as sclera, retina and ciliary body. But any destructive changes in the central nervous systems were not detected. This case of eye defect was defined as severe bilateral microphthalmia. The cause of this ocular defect is unknown.