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이찬형,윤현숙,박연준,권종대,노기철,장성환 한국환경과학회 2002 한국환경과학회지 Vol.11 No.12
This study was conducted to determine the contents of heavy metals in leaves of roadside trees according to different growth stages in Daegu city. The orders of heavy metal contents in leaves of roadside tree and soil were Fe〉Mn〉Zn〉Pb〉Cu〉Cr〉Cd and Fe〉Mn〉Zn〉Cu〉Pb〉Cr〉Cd, respectively. The contents of heavy metals in leaves of roadside trees and soil showed an increasing tendency as the levels of traffic volume increased. The contents of heavy metals in leaves on October were higher than those on May.
노윤찬 ( Yun-chan Roh ) 한국고등직업교육학회 2000 한국고등직업교육학회논문집 Vol.1 No.2
This study is concerned with the treatment of landfill leachate by carrier meditated emulsion. Using batch operation, the optimal conditions for the removal of anionic and cationic materials were obtained. The landfill leachate from the plant was experimented under these conditions. The experimental variables were the concentration of surfactant(Arlacel80) and the concentration of carrier (Aliquat336, DEHPA) in emulsion phase and counter ion concentration in internal phase. More than 80%(COD) of landfill leachate component could be removed within 12 minutes. The most crucial experimental variable for the removal efficiency was carrier concentration in emulsion. Among other variables, reaction time was more important than removal efficiency.
Fabrication of a three-electrode battery using hydrogen-storage materials
Roh, Chi-Woo,Seo, Jung-Yong,Moon, Hyung-Seok,Park, Hyun-Young,Nam, Na-Yun,Cho, Sung Min,Yoo, Pil J.,Chung, Chan-Hwa Elsevier 2015 Journal of Power Sources Vol.280 No.-
<P><B>Abstract</B></P> <P>In this study, an energy storage device using a three-electrode battery is fabricated. The charging process takes place during electrolysis of the alkaline electrolyte where hydrogen is stored at the palladium bifunctional electrode. Upon discharging, power is generated by operating the alkaline fuel cell using hydrogen which is accumulated in the palladium hydride bifunctional electrode during the charging process. The bifunctional palladium electrode is prepared by electrodeposition using a hydrogen bubble template followed by a galvanic displacement reaction of platinum in order to functionalize the electrode to work not only as a hydrogen storage material but also as an anode in a fuel cell. This bifunctional electrode has a sufficiently high surface area and the platinum catalyst populates at the surface of electrode to operate the fuel cell. The charging and discharging performance of the three-electrode battery are characterized. In addition, the cycle stability is investigated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We design new-concept three-electrode battery using hydrogen as energy carrier. </LI> <LI> Charging process is electrolysis of alkaline electrolyte. </LI> <LI> Discharging process is operation of alkaline fuel cell. </LI> <LI> Hydrogen is stored at bifunctional electrode as metal hydride with charging process. </LI> <LI> Bifunctional electrode acts as electrolysis cathode and fuel cell anode at same time. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Yun Sun Choi ),( Ji Young Hong ),( Jee Youn Hong ),( Yoo-min Kim ),( Ji-hee Sung ),( Suk-joo Choi ),( Soo-young Oh ),( Cheong-rae Roh ),( Hye Seon Kim ),( Se In Sung ),( So Yoon Ahn ),( Yun Sil Chan 대한산부인과학회 2021 Obstetrics & Gynecology Science Vol.64 No.1
Objective To evaluate the effects of maternal body mass index (BMI) and plurality on maternal and umbilical cord serum magnesium levels after antenatal magnesium sulfate treatment. Methods This was a retrospective cohort analysis of 135 women treated with antenatal magnesium sulfate at less than 32 weeks of gestation between January 2012 and June 2018. Subjects were stratified into groups according to maternal BMI (group I [18.5-22.9 kg/m²], group II [23.0-24.9 kg/m²], and group III [≥25.0 kg/m²]) and plurality (singleton and twin). Univariable and multivariable analyses were performed to compare the umbilical cord serum magnesium levels between the groups. Results Maternal serum magnesium levels were not significantly different between the maternal BMI groups and singleton and twin pregnancies. Umbilical cord serum magnesium levels were significantly different among the maternal BMI groups (3.3±1.2 mg/dL in group I, 3.3±1.2 mg/dL in group II, and 4.0±1.4 mg/dL in group III, P=0.003). The trend of increase in magnesium levels was statistically significant (P=0.001, Jonckheere-Terpstra test). Umbilical cord serum magnesium levels were not significantly different according to plurality. However, in the multivariable analysis, maternal BMI and plurality were not significantly associated with umbilical cord serum magnesium levels after adjusting for indication and total dose of magnesium sulfate treatment, gestational age at delivery, mode of delivery, neonatal sex, and birth weight. Conclusion Maternal BMI and plurality were not significantly associated with maternal or umbilical cord serum magnesium levels after exposure to antenatal magnesium sulfate treatment.
Lim, Yun-Jin,Kim, Do-Hyung,Roh, Heyong Jin,Park, Myoung-Ae,Park, Chan-Il,Smith, Peter Springer-Verlag 2016 AQUACULTURE INTERNATIONAL Vol.24 No.4
<P>The susceptibility of 52 isolates of Edwardsiella tarda and 54 isolates of Vibrio harveyi to 12 antibiotics was established using internationally standardised disc diffusion protocols. Normalised resistance interpretation was employed to generate statistically valid epidemiological cut-off values for these susceptibility data. For three of these 24 species/antibiotic data sets, there were insufficient fully sensitive strains to allow analysis and for an additional two there were sufficient fully susceptible isolates to allow only a provisional estimate to be made. The data sets for a further two species/antibiotic combinations were considered too diverse to allow the calculation of a valid cut-off value. Valid epidemiological cut-off values were, therefore, calculated for 17 species/antibiotic combinations. It is argued that these cut-off values will greatly facilitate the performance of studies designed to monitor the consequence of antibiotic use in aquaculture. They will also facilitate the prudent and rational choice of antibiotics to be applied therapeutically in commercial farming of aquatic animals.</P>
Regional amyloid burden and lacune in pure subcortical vascular cognitive impairment
Hong, Yun Jeong,Kim, Chan-Mi,Kim, Ji Eun,Roh, Jee Hoon,Kim, Jae Seung,Seo, Sang Won,Na, Duk L.,Lee, Jae-Hong PERGAMON PRESS LTD 2017 NEUROBIOLOGY OF AGING Vol. No.
<P><B>Abstract</B></P> <P>We investigated the amyloid and vascular burden in Pittsburgh compound B (PiB)–negative subcortical vascular mild cognitive impairment (svMCI) and PiB-negative subcortical ischemic vascular dementia (SIVD) to elucidate the potential roles of amyloid deposition and small vessel disease (SVD). Thirty-eight svMCI patients and 42 SIVD patients were enrolled. The regional PiB uptake values and SVD markers were obtained and compared between groups. Additionally, correlations among amyloid burden, SVD, and cognition were made. Patients with PiB-negative SIVD showed more amyloid deposition than those with PiB-negative svMCI, particularly in the cuneus, lingual gyrus, supramarginal, and angular gyri. Despite subthreshold levels for amyloid deposition, our findings showed a marked regional difference in amyloid uptake between svMCI and SIVD, particularly in posteriorly located brain areas. However, lacune, a proxy for vascular burden, showed a broader association with cognition and had more impacts on developing dementia than amyloid burden. The topographical pattern of amyloid deposition and its impact on clinical status in pure subcortical vascular cognitive impairment were different from those in Alzheimer's disease.</P>
분체공학 유동충 재료 ( 무기 , 유기 , 고분자 ) : 구형의 형태를 가지는 푸른색 발광 BAM 형광체
강윤찬(Yun Chan Kang),노현숙(Hyun Sook Roh),박승빈(Seung Bin Park) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.6
The blue emitting BAM phosphor particles with various compositions were prepared by the spray pyrolysis. The effect of composition on the morphology of BAM particles was investigated. In the case of BaMgAl_(10)O_(22):Eu^(2+), the morphology of particles with sphericity and non-aggregation characteristics disappeared after post-treatment at 1,400 ℃ for 3 hrs. On the other hand, the other composition particles except BaMgAl_(10)O_(22):Eu^(2+) maintained their original morphology after posttreatment, even if the particles were prepared at low temperatures in the spray pyrolysis. The BAM particles with MgAl₂O₄as intermediate material at low post-treatment temperature had high thermal stability and maintained sphericity of particles after post-treatment. The BAM particles had submicron size and narrow size distribution before and after post-treatment. All the samples had main emission peak at 450 ㎚, which corresponds to blue emission. The optimum post-treatment temperature of BAM : Eu²+ particles for the maximum PL(photoluminescence) intensity in the spray pylolysis was 1,400 ℃ because of high crystallinity, phase-purity, and good morphology.
Ryu Jae-Chan,Yoon Jong-Tae,Kim Byung Jun,Kim Mi Hyeon,Moon Eun Ji,Suh Pae Sun,Roh Yun Hwa,Moon Hye Hyeon,Kwon Boseong,Lee Deok Hee,Song Yunsun 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.7
Objective: Three-dimensional rotational angiography (3D-RA) is increasingly used for the evaluation of intracranial aneurysms (IAs); however, radiation exposure to the lens is a concern. We investigated the effect of head off-centering by adjusting table height on the lens dose during 3D-RA and its feasibility in patient examination. Materials and Methods: The effect of head off-centering during 3D-RA on the lens radiation dose at various table heights was investigated using a RANDO head phantom (Alderson Research Labs). We prospectively enrolled 20 patients (58.0 ± 9.4 years) with IAs who were scheduled to undergo bilateral 3D-RA. In all patients’ 3D-RA, the lens dose-reduction protocol involving elevation of the examination table was applied to one internal carotid artery, and the conventional protocol was applied to the other. The lens dose was measured using photoluminescent glass dosimeters (GD-352M, AGC Techno Glass Co., LTD), and radiation dose metrics were compared between the two protocols. Image quality was quantitatively analyzed using source images for image noise, signal-to-noise ratio, and contrast-to-noise ratio. Additionally, three reviewers qualitatively assessed the image quality using a five-point Likert scale. Results: The phantom study showed that the lens dose was reduced by an average of 38% per 1 cm increase in table height. In the patient study, the dose-reduction protocol (elevating the table height by an average of 2.3 cm) led to an 83% reduction in the median dose from 4.65 mGy to 0.79 mGy (P < 0.001). There were no significant differences between dose-reduction and conventional protocols in the kerma area product (7.34 vs. 7.40 Gy·cm2, P = 0.892), air kerma (75.7 vs. 75.1 mGy, P = 0.872), and image quality. Conclusion: The lens radiation dose was significantly affected by table height adjustment during 3D-RA. Intentional head offcentering by elevation of the table is a simple and effective way to reduce the lens dose in clinical practice.