• Korean Journal of Digital Imaging in Medicine
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• v.9 no.1
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• pp.37-43
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• 2007

1. Purpose : This study is to present effective exposure conditions to acquire the best image of simple abdomen in Film Screen (F.S) system and Computed Radiography (C.R) system. 2. Method : In the F.S system, while an exposure condition was fixed as 70kVp, images of a patients simple abdomen were taken under the different mAs exposure conditions. Among these images, the best one was chosen by radiologists and radiological technologists. In the C.R system, the best image of the same patient was acquired with the same method from the F.S system. Both characteristic curves from F.S system and C.R system were analyzed. 3. Results : In the F.S system, the best exposure condition of simple abdomen was 70kVp and 20mAs. In the CR system, with the fixed condition at 70kVp, the image densities of human organs, such as liver, kidney, spleen, psoas muscle, lumbar spine body and iliac crest, were almost same despite different environments (3.2mAs, 8mAs, 12mAs, 16mAs and 20mAs). However, when the exposure conditions were over or under (below) 12mAs, the images between the abdominal wall and the directly exposed part became blurred because the gap of density was decreased. In the C.R system, while the volume of mAs was decreased, an artifact of quantum mottle was increased. 4. Conclusion : This study shows that the exposure condition in the C.R system can be reduced 40% than in the F.S system. This paper concluded that when the exposure conditions are set in CR environment, after the analysis of equipment character, such as image processing system(EDR : Exposure Data Recognition processing), PACS and so on, the high quality of image with maximum information can be acquired with a minimum exposure dose.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.375-376
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• 2014

본 논문은 전동기의 V/F 운전시 발생하는 경부하 진동을 억제하는 방법을 제안한다. 제안한 방법은 기존의 무부하 전류를 사용하는 방법을 변형하여 V/F 운전시 전원 및 기계적 진동에 의해 발생하는 경부하 진동을 억제하여 운전 특성을 향상시킨다. 제안한 방법을 적용한 V/F 운전 특성을 실험을 통하여 검증하고 기존의 V/F 운전 대비 개선된 성능을 비교 분석한다.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2002.11b
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• pp.50-50
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• 2002

배추무사마귀병 저항성 유전 양식을 증명하기 위해서 CR계 F1에서 유래된 F2 세대를 포장시험과 유묘 검정을 실시하였다. F$_2$ 세대의 7 집단은 단인자우성으로 3:1의 분리비를 보였고, 5 집단은 중복 유전자가 관여하는 9:7의 유전 분리비를 보였다. 배추무사마귀병 저항성 유전자와 연관된 DNA 마커를 개발하기 위하여 CR-Saerona F$_2$ 집단을 배추무사마귀병 발병포장에서 재배하여 저항성 평가를 하였다. 220개의 임의의 프라이머를 이용하여 BSA-RAPD (Bulked segregant analysis-Randomly amplified polymorphic DNA)를 수행하였지만 CR-Saerona F2 집단에서 배추무사마귀병 저항성 유전자와 꼭 들어맞는 DNA 마커는 발견되지 않았다. 300개의 임의의 프라이머를 이용하여 CR-Saerona에서 유래된 F$_2$ 세대를 QTL 분석하였다. 저항성 정도는 발병지수에 따라 조사되었고 QTL 분석을 위해 one-way ANOVA 테스트를 하였다. 통계분석 결과 두 프라이머(K16-1, L2-2)가 저항성과의 상관관계를 보여 주었으나 유의성은 인정되지 않았다.

• Journal of IKEEE
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• v.3 no.2 s.5
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• pp.236-242
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• 1999

J noise component due to base spreading resistance ${\gamma}_{bb}$ of bipolar junction transistors fabricated by BiCMOS process is experimentally analyzed. The analysis of equivalent noise circuit for common collector shows that output 1/f noise value is purely generated from ${\gamma}_{bb}\;when\;g_m^{-1}-{\gamma}_{bb}-R_B$ is closely to zero. From the $S^{1/f}_{Irbb}=K_fI_b{^{A_1}}/f$, we fine that $A_f=2,\;K_f{\simeq}5{\times}10^{-9}$. And Hooge constant ${\alpha}$ values are in the order, of 10$^{-3}$.

• Analytical Science and Technology
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• v.30 no.5
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• pp.240-251
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• 2017

1,1,1,2-Tetrafluoroethane (HFC-134a), which is used as refrigerant in air conditioners, has been recently regulated as a greenhouse gas and is recommended for reuse by refining. It is very important to quantitatively analyze trace impurities present in the refrigerant to evaluate the criteria for reuse. In this study, trace impurities including C, H, Cl, and F, which are difficult to quantify because there are no reference materials, were quantitatively analyzed by a gas chromatograph-atomic emission detector (GC/AED); for this analysis, this was preceded by a qualitative analysis with a GC-mass selective detector (GC/MSD). In addition, the AED response was investigated using a hydrocarbon mixed reference material, which was proportional to the number of atoms in the component. Fifteen refrigerant components were detected as trace impurities in HFC-134a by qualitative analysis of trace impurities including C, H, Cl, and F in the samples. Based on the results of the qualitative analysis, quantitative analysis of trace impurities using AED showed that the highest mole fractions were for the $CHClF_2$ component ($45438.38{\mu}mol/mol$) in one sample and for the $C_2H_2ClF_3$ component ($1311.47{\mu}mol/mol$) in another sample. From this study, it has been shown that it is possible for this analytical method to be applied to the qualitative and quantitative analysis of trace compounds in refrigerants, which are difficult to quantify because of the absence of reference materials.

• Korean Journal of Medicinal Crop Science
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• v.16 no.1
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• pp.20-26
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• 2008

Anemarrhena asphodeloides (Korean name "Ji-Mo") has been used for oriental medicinal purposes in Korea, China and Japan. In this study, 29 A. asphodeloides samples were collected including 3 certified A. asphodeloides plants and many commercially marketed A. asphodeloides products. Chloroplast trnL-F regions of the "Ji-Mo" samples were sequenced and used to identify whether the samples were genuine A. asphodeloides or not. As the result, the trnL-F sequences of all the "Ji-Mo" samples were shown to be identical and it was proven that commercially available medicinal products "Ji-Mo" are genuine A. asphodeloides. Phylogenetic tree of. A. asphodeloides using the trnL-F sequences was constructed and compared with phylogenetic tree using rubisco large subunit (rbcL) gene sequences. In these tree, A. asphodeloides was affiliated in the family Agavaceae in the order Asparagales. It is proven that trnL-F phylogenetic tree is useful to study taxonomic position of A. asphodeloides.

• Membrane Journal
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• v.23 no.3
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• pp.204-210
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• 2013

Recently, many applications with grapheneoxide (GO) have been reported. But GO membrane for water treatment has not been developed. In this study we prepared polyvinylidene difluoride (PVdF) nanofiber/GO hybrid membrane (FG) for the microfiltration application. The PVdF substrate membrane was prepared by using the electrospinning method with a solution of PVdF in N,N-dimethylacetamide (DMAc) and acetone. GO sheets used in this study were prepared by modified Hummer's method. The PVdF/GO hybrid membrane was finally prepared by spraying the GO solution dispersed in ethanol on the PVdF nanofiber. The successfully prepared FG was thoroughly examined by SEM, Raman, contact angle, porometer and UTM, and water-flux was measured with designed cell (Dead-End Cell). From the contact angle results, it was found that the surface of FG membrane was reformed by hydrophilic property and the water permeability was increased about 2.5 times than that of the nascent PVdF membrane, indicating the possible alternative of the commercial MF membrane.

• The Korean Journal of Mycology
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• v.43 no.4
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• pp.231-238
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• 2015

Genome-wide reanalyzed data of 25 Flammulina strains were compared against the reference genome (KACC42780) to establish a genome-wide single nucleotide polymorphism (SNP). The rate of mapping differences between the strains reflected in the strain variation in its result. Genome-wide SNPs distribution divided into types of homozygous SNP and heterozygous SNP moreover all of the strains demonstrated a wide variation in all of the regions. In the further study of topological relationship between the collected strains, phylogenetic tree was separated into 3 major groups. Group I contained F. velutipes var. related strains of ASI 4062, 4148, 4195. Group 2 contained strains that are different species of ASI 4188 F. elastica, ASI 4190 F. fennae, and ASI 4194 F. rossica. The other 19 strains F. velutipes were classified as a single group. However, further experiment to discriminate its genetic relationship between the white group and brown group did not verify its validity. The inferred tree exhibited a phylogenetic relationship between Korea white fruitbody forming strains of ASI 4210, 4166, 4178 and Japan white fruitbody forming strains of ASI 4209, 4167 confirmed to be genetically closely related.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.9 no.3
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• pp.266-272
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• 2016

In this study, we analysed the technology convergence of Internet of Things(IoT) by International Patent Classification(IPC) code analysis. 163 patent applications in Korea are the subjects of this study. We confirmed that the most representative IPC code combinations between Main and Sub categories are G06Q 50/24-G06Q 50/22(6 cases), H04L 29/02-H04L 12/28(4 cases), G06F 15/16-G06F 3/048(3 cases), G06F 15/16-G06F 9/44(3 cases), and G06Q 50/22-G06Q 50/24(3 cases). The field of Health Care business have been prepared 9 patent applications by technology convergence between 'Health Care(G06Q 50/22)' and 'Patient Record Management(G06Q 50/24)'. Finally we also concluded that the core IPC code are G06F 15/16, G06Q 50/22, G06Q 50/24, and H04L 12/28 by the technology convergence interconnections analysis of IoT patent applications.

• The Bulletin of The Korean Astronomical Society
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• v.40 no.1
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• pp.89.3-90
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• 2015

HD5371(${\alpha}_{2000}=00^h57^m31^s.7{\delta}_{2000}=+75^{\circ}18^{\prime}04^{{\prime}{\prime}}.8$))은 2009년 처음으로 ${\delta}$ Scuti형 변광성으로 분류되었으나(Gregor 2009) 그동안 구체적인 변광 주기 분석이 이루어지지 않은 항성이다. 강원대학교 천체 관측실에서는 이 변광성에 대한 정확한 변광 주기를 분석하기 위한 관측을 수행하였다. 관측은 2014년 10월부터 2015년 2월까지 14-인치 및 10-인치 슈미트-카세그레인식 망원경과 QHY9 CCD 카메라를 사용하였다. 총 6일의 관측을 수행하여 얻은 측광 자료에 대하여 Period04를 활용한 power spectrum 분석을 통해 변광 주기를 찾았다. 이 분석을 통해 2개의 변광 주기 $f_1$=7.127c/d, $f_2$=1.995c/d를 찾았다. 2개의 주기 가운데 $f_1$은 fundamental mode로서 Gregor(2009)가 처음으로 제시한 주기 0.1389 day와 일치하는 것이며, $f_2$는 이 연구에서 새롭게 찾은 주기로서 non-radial mode에 해당되는 것으로 해석하였다. 분석 결과를 바탕으로 HD5371의 변광 특성과 물리적 성질을 논하였다. HD5371의 완전한 주기 해를 얻기 위한 장기 관측을 수행 중에 있다.