• 대한임상검사과학회지
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• 제40권2호
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• pp.86-93
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• 2008

This study was performed to investigation of the serum alpha-fetoprotein (AFP) levels in healthy adults. A total of 2,160 (male 1,415, female 745) health checkup adults were examined for AFP levels by chemiluminescence immunoassay (CLIA) method, during the period from September, 2007 to August, 2008. The mean serum AFP level was 2.168 (0.605~20.35) ng/mL, and it was 2.309 (0.605~20.35) ng/mL in male, 1.906 (0.605~10.36) ng/mL in female, respectively. 1,816 (male 1,109, female 709) healthy adults were screened for the absence of viral hepatitis and normal alanine amino transferase (ALT) levels. The mean serum AFP level of healthy adult was 2.041 (0.605~7.83) ng/mL, and it was 2.181 (0.605~7.83) ng/mL in male, 1.822 (0.605~6.55) ng/mL in female, respectively. Serum AFP increased with age group, there was a higher level in male compared to female. These results suggests that the use of reference value of AFP in healthy adults in the Jeonbuk. With the reference value now defined, it becomes possible to compare levels in different populations.

• 한국생산제조학회지
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• 제24권6호
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• pp.605-612
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• 2015

Three dimensional (3D) position determination and motion recognition using a 3D depth sensor camera are applied to a developed penguin-shaped robot, and its validity and closeness are investigated. The robot is equipped with an Asus Xtion Pro Live as a 3D depth camera, and a sound module. Using the skeleton information from the motion recognition data extracted from the camera, the robot is controlled so as to follow the typical three mode-reactions formed by the operator's gestures. In this study, the extraction of skeleton joint information using the 3D depth camera is introduced, and the tracking performance of the operator's motions is explained.

• Bulletin of the Korean Chemical Society
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• 제35권2호
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• pp.605-609
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• 2014

Magnetic multi-granule nanoclusters (MGNCs) were investigated as an inexpensive means to effectively remove arsenic from aqueous environment, particularly groundwater sources consumed by humans. Various size MGNCs were examined to determine both their capacity and efficiency for arsenic adsorption for different initial arsenic concentrations. The MGNCs showed highly efficient arsenic adsorption characteristics, thereby meeting the allowable safety limit of $10{\mu}g/L$ (ppb), prescribed by the World Health Organization (WHO), and confirming that 0.4 g and 0.6 g of MGNCs were sufficient to remove 0.5 mg/L and 1.0 mg/L of arsenate ($AsO_4{^{3-}}$) from water, respectively. Adsorption isotherm models for the MGNCs were used to estimate the adsorption parameters. They showed similar parameters for both the Langmuir and Sips models, confirming that the adsorption process in this work was active at a region of low arsenic concentration. The actual efficiency of arsenate removal was then tested against 1 L of artificial arsenic-contaminated groundwater with an arsenic concentration of 0.6 mg/L in the presence of competing ions. In this case, only 1.0 g of 100 nm MGNCs was sufficient to reduce the arsenic concentrations to below the WHO permissible safety limit for drinking water, without adjusting the pH or temperature, which is highly advantageous for practical field applications.

• Bulletin of the Korean Chemical Society
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• 제23권4호
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• pp.605-609
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• 2002

A competitive enzyme-linked immunosorbent assay (ELISA) was developed for the quantitative detection of organophosphorus insecticide cyanophos. An analogue (hapten) of cyanophos was synthesized and was coupled to BSA to produce polyclonal antibodi es from rabbits. The antisera were screened against another hapten coupled to ovalbumin (OVA). Using the sera of highest specificity, an antigen-coated ELISA was developed, which showed an I50 of 310 ng/mL with the detection limit of 20 ng/mL. The antibodies showed negligible cross-reactivities with other organophosphorus pesticides except for parathion-methyl, which makes the assay suitable for the selective detection of cyanophos.

• 한국표면공학회지
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• 제43권4호
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• pp.199-204
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• 2010

The Co-Cr alloys have clinical histories as dental and orthopaedic implants, and recently as cardiovascular stent applications because they exhibit a high elastic modulus and radiopacity. In order to improve their mechanical and corrosion resistance, electropolishing is employed as the final process. Electropolishing, an anodic dissolution process in the transpassive state, is sensitively affected by process conditions such as current density, machining time, and electrode gap. In this study, the effect of the electropolishing conditions on surface roughness and corrosion resistance is investigated for Co-Cr alloys (L605). The most smooth surface is obtained when electropolishing is performed at 15-20 V for 15-30 sec with a electrode gap of 3.5 mm. It is found out that electropolishing reduces corrosion rate about one-tenth as much.

• 한국식생활문화학회지
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• 제35권6호
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• pp.605-612
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• 2020

In this study, 11 plant extracts from Bangladesh were used to evaluate the total phenolic and flavonoid content, in vitro antioxidant activities using 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azinobis-(3-ethylbenzthiazolin-6-sulfonic acid) (ABTS), and ferric reducing antioxidant power (FRAP) assay. Also, the inhibitory effect of nitric oxide (NO) production in RAW 264.7 macrophage cell line and the neuroprotective effect on H2O2-induced PC12 cells were tested. Our results revealed that Piper betle L. showed the highest total phenolic content (162.2 mg GAE/g extract) among the 11 plants from Bangladesh. Most plants showed strong radical scavenging effects and ferric reducing antioxidant power. Besides, Piper betle L. protected PC12 neuronal cells against H2O2 related oxidative stress in LPS-induced PC12 cells. Regarding the anti-inflammatory effect, Piper betle L. significantly inhibited NO accumulation in LPS-induced RAW 264.7 cells. Our results provide evidence that Piper betle L. could be useful for the development of functional health foods.

• 한국어류학회지
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• 제26권3호
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• pp.194-201
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• 2014

태안 연안에서 이각망에 어획된 숭어 이석을 관찰하여 연령을 사정하고, 이석 윤문의 폭으로부터 체장을 역추정하여 성장을 추정하였다. 태안 연안 숭어는 외해에서 산란하여 유어기를 보낸 후 성어가 연안으로 들어온 것으로 보이며, 관찰한 숭어의 전장은 239~605 mm 범위였으며, 400~550 mm 크기의 개체가 주를 이루었다. 나이는 1~7세 범위였고 3~5세어가 가장 많았다. 전장(L, mm)은 이석의 장반경(R, ${\mu}m$)에 유의하게 일차 비례하였다(L=15.3+87.9 R). Frazer-Lee의 방법으로 추정한 각 연륜이 형성되었을 때의 전장은 1세어의 평균(${\pm}SD$)은 $316{\pm}40.6mm$로 초기 성장이 빨랐으며, 각 나이에서 그 범위가 넓어 개체에 따른 성장률 차이가 큰 것으로 보인다. 역추산한 전장은 Von Bertalanffy의 성장식 $L_t=542[1-{\exp}\{-0.493(t+0.769)\}]$로 유의하게 회귀되었다.

• 문화기술의 융합
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• 제8권6호
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• pp.605-614
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• 2022

본 연구에서는 오레가노를 초임계유체추출법과 열수추출법으로 추출하여 항균, 항산화 in vitro 실험을 수행하였다. 항균실험인 Disc diffusion method 결과, 초임계추출물에 대해서만 clear zone이 나타났다. S. aureus에 대한MIC는 초임계추출물에서만 관찰되었으며, 1000 ㎍/mL로 확인되었다. 열수추출물은 C. acnes에 대한 MIC가 125 ㎍/mL로 여드름균에 대한 항균력이 뛰어났다. 나아가 우리는 Biofilm inhibition assay를 통해 오레가노 초임계추출물이 125 ㎍/mL의 저농도에서도 S. aureus의 바이오필름을 70%이상 억제한다는 것을 발견하였다. DPPH radical 소거능, ABTS+ radical 소거능, SOD 유사활성능과 총 폴리페놀 함량 측정에서 열수추출물의 항산화력이 초임계추출물보다 우수하게 측정되었다. 나아가, 앞서 확인된 오레가노 초임계추출물의 S. aureus 바이오필름 억제능을 활용하여 아토피 피부에 적합한 소재를 개발하고자 하였다. 오레가노 초임계추출물의 낮은 용해도를 극복하고 안정성을 증가시키기 위하여 리포좀을 이용하였다.

• Journal of applied mathematics & informatics
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• 제26권3_4호
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• pp.605-614
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• 2008

In this paper, we find the matrix representation of multi-degree reduction by $L_{\infty}$ of $B{\acute{e}}zier$ curves with constraints of endpoints continuity. Using the basis transformation between Chebyshev polynomials and Bernstein polynomials we can derive the matrix representation of multi-degree reduction of $B{\acute{e}}zier$ with respect to $L_{\infty}$ norm.

• 대한수학회보
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• 제46권3호
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• pp.599-605
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• 2009

Let R be a prime ring, H a generalized derivation of R and L a noncommutative Lie ideal of R. Suppose that $u^sH(u)u^t$ = 0 for all u $\in$ L, where s $\geq$ 0, t $\geq$ 0 are fixed integers. Then H(x) = 0 for all x $\in$ R unless char R = 2 and R satisfies $S_4$, the standard identity in four variables.