• Proceedings of the KIPE Conference
• /
• 2019.07a
• /
• pp.406-407
• /
• 2019

본 논문에서는 유도전동기의 V/F 속도제어 시 특정 구간에 발생하는 전류 리플 저감에 대한 방법을 제안한다. V/F 속도제어 시 특정 구간에 발생하는 전류 리플을 분석하고, 주파수에 따른 극전압 보상량을 결정하여 보상하였다. 극전압 보상을 통해 유도전동기의 전류 리플을 저감시켜 인버터의 효율적인 제어가 가능하게 하였다. 이를 15kW 유도전동기 시스템에 대한 실험을 통해 제안된 방법의 효율성을 검증하였다.

• Progress in Medical Physics
• /
• v.20 no.3
• /
• pp.159-166
• /
• 2009

Obviously, the administration of the prescribed amount of activity to the patient requires proper operation of the dose calibrator, which shall be verified by implementing the required quality control on the instrument. This investigation examined the accuracy and precision of dose calibrator activity measurement of the radiopharmaceutical F-18 FDG. To investigate the status of the nuclear medicine centers in Korea for the performance of dose calibrators, 10 centers providing PET/CT system services in Korea were inspected in 2008. We measured accuracy and precision in 10 equipments in consideration of PET/CT model, installation area, and installation time. According to the results of comparative analysis of 10 dose calibrators used to measure radioactivity of F-18 FDG, accuracy was -5.00~4.50% and precision was 0.05~0.45%, satisfying the international standards, which are accuracy ${\pm}$10% and precision ${\pm}$5%. This study demonstrated that, for accurate measurements, no adjustment is necessary for a dose calibrator setting when measuring different dose calibrators of F-18 FDG activity prescriptions.

• Microbiology and Biotechnology Letters
• /
• v.45 no.1
• /
• pp.35-42
• /
• 2017

This study aimed to investigate the effects of probiotic fermentation by comparing the skin antioxidant and anti-inflammatory properties of non-fermented (ARE) and fermented (ARE-F) hot water extracts of Agastache rugosa leaves. ARE-F was obtained via ARE fermentation using Lactobacillus rhamnosus HK-9. In vitro, anti-inflammatory properties were evaluated by analyzing the levels of nitric oxide (NO), reactive oxygen species (ROS), and inducible nitric oxide synthase (iNOS) in lipopolysaccharide (LPS)-stimulated HaCaT keratinocytes. In vitro antiradical activity was measured using 2,2-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay. Attenuation of LPS-stimulated NO (p < 0.01), ROS (p < 0.001) and iNOS (p < 0.05) levels by ARE-F was significantly stronger than that by ARE in HaCaT keratinocytes. However, no differences were observed between the DPPH radical scavenging activities of ARE and ARE-F. ARE-F possesses enhanced skin antioxidant and anti-inflammatory properties, suggesting that probiotic bacterial fermentation can be considered an effective tool for augmenting some pharmacological properties of A. rugosa leaves. In brief, the skin antioxidant and anti-inflammatory potentials of A. rugosa leaf extract are augmented by the fermentation with L. rhamnosus HK-9, a probiotic bacterium.

• Journal of Digital Convergence
• /
• v.12 no.4
• /
• pp.437-442
• /
• 2014

Objectives: The objective of this study was to the effects of spiritual program on anxiety and depression among women in menopause. Methods: Subjects are 20 women in menopause. Structured questionnaires were used for data collection before, after and 6 month later Spiritual program, and descriptive statistics, t-test, ANOVA of SPSS 21.1 program were performed for data analysis. Results: Anxiety(F=8.55, p=.009) and depression(F=8.76, p=.001) has significant difference according to stages. Significant factors influencing anxiety included education(F=4.13, p=.034) and career of christianity(F=10.57, p=.001). Conclusion: Spiritual program is concluded by us it has proven that psychological healing program like anxiety and depression so has been practiced actively. And Spiritual program is needed according to general characteristics.

• Journal of Korean Society of Forest Science
• /
• v.74 no.1
• /
• pp.61-66
• /
• 1986

This study was conducted to estimate the heritabilities of height and stem diameter growth in 5- and 6-year-old Pinus koraiensis. Estimates of individual tree and family heritability for height growth were $h^2_I=0.40$, $h^2_F=0.77$ in 5-year-old and $h^2_I=0.57$, $h^2_F=0.89$ in 6-year-old, respectively. Heritabilities for diameter growth were estimated as $h^2_I=0.16$, $h^2_F=0.53$ and $h^2_I=0.26$, $h^2_F=072$ in 5-and 6-year-old seedlings.

• Journal of Digital Convergence
• /
• v.13 no.6
• /
• pp.287-296
• /
• 2015

This study was purposed to figure out current situation of part of 273 middle-school girls' dietary behavior and problems, then provide baseline data which helps to develop desirable eating behavior and life style. It appeared that suitable amount of eating(F=6.378, p=.002), degree of unbalanced diet(F=3.542, p=.030), Nutrients intake(F=6.780, p=.001), and life style(F=4.291, p=.015) differs between groups depending on student's subjective physical health status. It turned up that perceived physical health status is related to moderate amount of eating, degree of unbalanced diet, and Nutrients intake(p<0.05). As a results, in the period of adolescent which is a rapid growth period, there should be a systematic and endurable practice of right eating behavior, foods for formation of lifestyle, and convergence education in health area.

• The Korean Journal of Applied Statistics
• /
• v.31 no.5
• /
• pp.667-675
• /
• 2018

When a financial time series consists of daily (closing) returns, traditional volatility models such as autoregressive conditional heteroskedasticity (ARCH) and generalized ARCH (GARCH) are useful to figure out daily volatilities. With high frequency returns in a day, one may adopt various multivariate GARCH techniques (MGARCH) (Tsay, Multivariate Time Series Analysis With R and Financial Application, John Wiley, 2014) to obtain intraday volatilities as long as the high frequency is moderate. When it comes to the ultra high frequency (UHF) case (e.g., one minute prices are available everyday), a new model needs to be developed to suit UHF time series in order to figure out continuous time intraday-volatilities. Aue et al. (Journal of Time Series Analysis, 38, 3-21; 2017) proposed functional GARCH (fGARCH) to analyze functional volatilities based on UHF data. This article introduces fGARCH to the readers and illustrates how to estimate fGARCH equations using UHF data of KOSPI and Hyundai motor company.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.15 no.3
• /
• pp.1288-1293
• /
• 2014

This paper proposes a new method to estimate the striking velocity for ballistic limit velocity in MIL-STD-662F. The method from MIL-STD-662F needs relative air density, drag coefficient, form factor, ballistic coefficient for estimating striking velocity. So precedent studies are essential. However, the new method can estimate striking velocity only using measured velocities and distance between the screen and the target. To prove new method, we compared estimation of striking velocity from both the new method and the method from MIL-STD-662F on the basis of datain PRODAS. The new method shows bigger errors in some velocity ranges. But it could still calculate ballistic limit velocity. It also shows smaller errors in most velocity ranges.

• Korean Journal of Ichthyology
• /
• v.9 no.1
• /
• pp.91-98
• /
• 1997

The transgene, pFV4CAT, containing CAT reporter gene regulated by carp $\beta$-actin promoter, was expressed in independent transgenic mud loach germ lines, determined by reverse transcriptase-PCR (RT-PCR) and enzyme-linked immunosorbant assay (ELISA). Expression of the transmitted transgene was found to be tissue-specific in F1 and F2 generations. Tissue specificity of the expression was dependent on each transgenic line with reproducible patterns. Liver and spleen did express the transgene more frequently than other tissues tested, and muscle and heart revealed the higher amount of CAT than other tissues, while testes showed the lowest expression level. The highest level of CAT expression in muscle from a transgenic F1 line was corresponding to 68-fold compared to the basal levels of controls.

• Journal of the Korean Geotechnical Society
• /
• v.29 no.12
• /
• pp.5-10
• /
• 2013

Bearing capacity of a drilled shaft can be separated into side resistance and base resistance. But in domestic design procedure side resistance is usually underestimated compared with base resistance. Results of bi-directional test showed that measured side resistances in each different layers are larger than those evaluated from several suggested methods. In this study, measured side resistances in each different layer of drilled shafts installed in domestic sites are analyzed and compared with evaluated side resistances from the method using revised SPT N value. For weathered rock and soft rock layer, from which rock core can hardly be obtained, we suggested new evaluated methods using revised SPT N value instead of the method using uniaxial compressive strength of rock. Resuts showed that the ranges of side resistance of cohesive and non-cohesive layer are $f_s{\leq}5tf/m^2$ and $f_s{\leq}15tf/m^2$ respectively. Range of side resistance in weathered rock is $15tf/m^2$ < $f_s{\leq}50tf/m^2$ and that in soft rock $f_s{\geq}35tf/m^2$.