• Journal of applied mathematics & informatics
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• 제30권3_4호
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• pp.655-663
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• 2012

Based on the elegant properties of the spectral norm and Thompson metric, we firstly give two perturbation estimates for the positive definite solution of the nonlinear matrix equation $$X-\sum^m_{i=1}A^{\ast}_iX^{\delta_i}A_i=Q(0<|{\delta}_i|<1)$$ which arises in an optimal interpolation problem.

• Journal of Pharmaceutical Investigation
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• 제9권4호
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• pp.1-7
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• 1979

The analytical method of phenobarbital and mephobarbital in the pharmaceutical preparation were investigated by the partition chromatographic method. The influence of 13 kinds of excipients and various kinds of ingredients such as 8 kinds of antipyretics and 5 kinds of antacids on the partition chromatographic analysis of phenobarbital and mephobarbital in the preparation were investigated. The results were not affected by materials with the exception of caffeine, aspirin and sulpyrin.

• 대한임베디드공학회논문지
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• 제10권3호
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• pp.171-178
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• 2015

Recently NAND flash memory has been found to be the primary cause of low performance in the smart device. NAND flash memory is different from each other the execution time of I/O operations that flash file system is required. Therefore, it is necessary to compare and analyze the flash file system I/O performance for the efficient I/O on smart device. In this paper, it was tested and analyzing the I/O performance of the YAFFS2, JFFS2, UBIFS. Experimental results most read I/O performance is good, but the writing I/O performance is not good. For UBIFS, showed a more good I/O performance compared to other flash file system.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 춘계학술발표회논문집
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• pp.125-130
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• 2004

As an application of GPS is increased by world geodetic system introduction gradually, in this time, It is increased necessary of GPS baseline analysis program development. In this study, I developed a baseline analysis program by L1/L2 carrier. And I compared a baseline analysis result with a commercial program. I showed precision of approximately ${\pm}$1cm in a baseline length in case of Narrow lane as a result that a baseline analysised a developed program.

• 대한영양사협회학술지
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• 제13권2호
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• pp.138-156
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• 2007

The purposes of this study were to a) measure the service quality attributes of foodservice type such as school foodservice, hospital foodservice and business & industry(B&I) foodservice, managed by contract management company(CMC), b) compare with service quality attributes by CMC scale, c) analyze overall customer satisfaction(CS) by the foodservice type and the CMC scale, and d) identify the effect of service quality attributes on an overall CS by the foodservice type and the CMC scale. The questionnaires were handed out to 6,620 customers of 207 school, 38 hospital, and 86 B&I foodservices in 108 CMCs. The statistical data analysis was completed using SPSS Win(ver 12.0) for descriptive analysis, t-test, reliability analysis, and multiple linear regression analysis. From an analysis on service quality attributes, 'proper arrangement of table and chair at hall distribution(3.53)', 'operation of nutrition education(3.50)' were highly perceived to student, 'correctable serving(4.08)', 'serve at fixed distribution time(4.08)', 'kindness of serving employee(4.04)' were highly perceived to patient, 'employee's kindness(3.84)' were highly perceived to customer of B&I. In comparison of service quality attributes by CMC scale, most scores of large enterprise(LE) were significantly higher than small and medium sized enterprise(SME) in school foodservice, hospital foodservice and B&I foodservice. Overall CS levels were 3.53 out of a maximum 5 on B&I, 3.46 on school, and 3.44 on hospital and were evaluated differently CS score by CMC scale. Finally, regression results for the effects of service quality attributes on overall CS by each of foodservice type were identified significantly different service quality attributes by foodservice type such as school, hospital, B&I(p<.001) and by CMC scale. For considering the goal of enterprise on profit-making through CS and the needs of customer on CS at moment of truth(MOT), the findings should be applied to the CMC and the foodservice industry.

• 한국철도학회논문집
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• 제16권4호
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• pp.286-297
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• 2013

본 연구에서는 PSC-I 거더 교량을 대상으로, 3차원 교량 모델로 이동하중해석에 의한 엄밀한 동적 안정성 해석을 수행할 때의 모델링 방법과 해석방법에 대한 영향 평가를 수행하였다. 이를 위해 콘크리트 및 자갈궤도 등을 채용할 때의 합리적인 모델링 방법론과 물성치를 제시하였다. 또한, 궤도 모델링 유무, 궤도 종류, 거더 중심에서 받침까지의 거리 고려 여부, 직접적분법과 모달해석법 등 이동하중해석법, 필터링 등이 응답에 미치는 영향을 분석하였다.

• 생명과학회지
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• 제28권6호
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• pp.733-737
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• 2018

박과 작물에 함유되어 있는 tetracyclic triterpene 성분 중 하나인 쿠쿠르비타신(cucurbitacin)-I는 대장암, 유방암, 간암세포에서의 항종양 활성이 밝혀져 있으나 난소암에서의 쿠쿠르비타신-I의 역할은 보고된 바 없다. CD44는 세포막에 존재하는 당단백질로 생체 내 리간드인 glycosaminoglycan hyaluronic acid를 통해 세포 외부 매트릭스와 다른 세포와의 접촉을 매개한다. 최근 연구에 의해 CD44의 발현이 난소암세포의 증식 및 세포 부착과 침윤을 증가시키는 주요 원인이라는 것이 보고되었다. 이러한 결과는 CD44의 발현을 억제함으로써 난소암의 진행을 조절할 수 있음을 시사하고 있다. 본 연구에서는 쿠쿠르비타신-I가 난소암세포의 CD44의 발현을 억제할 수 있는 지의 여부를 조사하였다. 인간의 난소암 세포인 SKOV-3를 이용한 MTS assay를 수행한 결과, 쿠쿠르비타신-I는 100 nM이상의 농도에서 세포독성을 나타내었다. 세포독성을 나타내지 않는 농도의 쿠쿠르비타신-I를 SKOV-3 세포에 처리하여 Western blot 분석과 qRT-PCR을 수행한 결과, 쿠쿠르비타신-I에 의해 CD44의 단백질과 mRNA의 발현이 유의적으로 감소되는 것을 확인하였다. 또한 쿠쿠르비타신-I에 의한 CD44의 발현 억제가 $NF-{\kappa}B$와 AP-1의 인산화 감소에 기인하고 있음을 밝혔다. 이러한 결과는 쿠쿠르비타신-I가 CD44 발현을 억제하는 기능을 가지며, 이는 난소암 치료에 도움을 줄 수 있는 제재로서 쿠쿠르비타신-I의 가능성을 제시하는 것이다.

• Journal of Ginseng Research
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• 제44권4호
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• pp.570-579
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• 2020

Background: Many researchers reported that the various immune activities of red ginseng are due to acid polysaccharides. But, the exact structural characteristics of the acidic polysaccharide in red ginseng have not been fully elucidated. Therefore, we isolated the acidic polysaccharide from red ginseng and characterized the structural property of the active moiety of this polysaccharide, which contributes to the immunostimulatory activity of red ginseng. Methods: A polysaccharide (RGP-AP-I) was purified from red ginseng via size-exclusion chromatography using Sephadex G-100. Immunostimulatary activity of RGP-AP-I was investigated via anti-complementory and macrophage stimulatory activity. The structure of RGP-AP-I was characterized by HPLC, sugar composition, β-glucosyl Yariv reagent and methylation analysis. Results: Peritoneal macrophages stimulated using RGP-AP-I significantly augmented the production of various cytokines such as interleukin (IL)-6, IL-12, and tumor necrosis factor (TNF)-α. The primary structure of RGP-AP-I was elucidated by assessing its sugar composition and methylation analysis. RGP-AP-I is a 96 kDa acidic polysaccharide, and comprises nine different monosaccharides, which mainly include sugars such as rhamnose (Rha, 9.5%), galacturonic acid (GalA, 18.4%), galactose (Gal, 30.4%), and arabinose (Ara, 35.0%). RGP-AP-I exhibited an considerable reaction with the β-glucosyl Yariv reagent, revealing the presence of arabino-β-3,6-galactan. Methylation analysis indicated that RGP-AP-I comprises 21 different glycosyl linkages, such as 3-, 4-, 6- and 3,6-linked Galp; 5-linked Araf; 2,4-linked Rhap; and 4-linked GalAp, which are characteristics of rhamnogalacturonan I (RG-I). Conclusion: we assumed that the immunostimulatory activity of RGP-AP-I may be due to the RG-I structure, which comprises a main chain with a repeating linkage unit, [→2)-Rhap-(1→4)-GalAp-(1→] and three groups of side chains such as (1→5)-linked arabinan, (1→4)-linked galactan, and arabino-β-3,6-galactan, which branch at the C(O)4 positions of Rha residues in the main chain of RGP-AP-I.

• 대한소아치과학회지
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• 제26권1호
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• pp.172-184
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• 1999

The present study was performed to identify morphologic sub-groupings in Korean children with Class I malocclusions, and to find out anatomic differences between the sub-groups. Standardized lateral cephalometric radiographs of 152 Korean children, aged between 6 and 12 years, with Class I malocclusions were analyzed by the Counterpart Analysis. A statistical method, Ward's Minimum Variance Cluster Analysis, was employed to divide the sample into sub-groups those with similar morphologic characteristics. The results were as follows; 1. There appeared two facial types, Type I and Type II, in Korean children with Class I malocclusions, 48.7% and 51.3%, respectively. 2. In both sub-groups, there existed strong Class III skeletal patterns due to a counterclockwise rotation of the Middle Cranial Fossa alignment, and strong Class II skeletal patterns due to the long Posterior Maxillary vertical dimension and a clockwise rotation of the Ramus alignment. 3. There were no significant differences in Upper Anterior Facial Height between Type I and Type II, $52.6{\pm}2.92mm\;and\;52.8{\pm}3.23mm$, respectively. 4. The Lower Anterior Facial Height in Type II was longer ($66.0{\pm}4.03mm$) due to the long Posterior Maxillary vertical dimension, the clockwise rotation of the Ramus alignment, and a clockwise rotation of the Mandibular plane alignment than that of Type I ($64.2{\pm}4.15mm$).

• 한국전자통신학회논문지
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• 제6권6호
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• pp.839-847
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• 2011

원자력발전소의 계측제어계통은 제어, 감시기능을 수행하여 안전운전을 위한 두뇌 역할을 하는 핵심적인 분야이다. 최근 계측제어계통은 마이크로프로세서기반의 디지털 기술을 받아들여 디지털화되었다. 그러나 계측제어계통의 디지털시스템은 아날로그 기반 시스템에 비해 사이버위협에 매우 취약하여, 사이버공격에 의해 발전소 안전에 부정적인 영향을 받을 수 있다. 따라서 사이버침해에 대응할 수 있는 사이버 보안 대책이 계측제어계통에 요구된다. 사이버 보안성이 우수한 계통 설계를 위해서는 계측제어계통을 구성하는 자산에 대한 효과적인 자산분석이 요구된다. 본 연구에서는 원자로 계측제어설계의 사이버보안 적합성을 분석하기 위한 전 단계로 계측제어계통의 디지털 자산을 분석하기 위한 방법론을 제안한다. 제안된 디지털자산 분석 방법은 자산식별, 식별된 자산에 대한 평가방법으로 구성된다. 제안된 자산분석방법은 원자력발전소 계측제어계통의 사이버보안을 위한 자산분석에 응용하였다.