기액 이상류시의 원심펌프특성에 관한 실험적 연구

김성윤,이상일,김유택,Kim, Sung-Yoon,Lee, Sang-Il,Kim, You-Taek 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.6

In a general centrifugal pump, if it is operated in a two-phase flow the activity of the impeller usually degrades and occasionally losses its function. However, the effect of break down of centrifugal pump due to entrained air has not been clarified yet. This paper shows the air-water two-phase flow characteristics of closed type and semi-open type impellers. In a sing1e-phase flow, closed-type impeller has higher efficiency and head. But in air-water two-phase flow semi-open type impeller's rates of decreases of efficiency and head are decreased.

Persistence of Chinese Milk Vetch(Astragalus sinicus L.) Seed in Naturally Reseeded CMV-Rice Field

Sang-Yeol Kim,Sung-Hwan Oh,Jong-Hee Lee,Jun-Hyeon Cho,Kuk-Hyun Jeong,Ji-Yoon Lee,Sung-Tae Park,You-Chun Song,Un-Sang Yeo,Jeong-Il Kim,Hang-Won Kang 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04

Field experiments were conducted to investigate persistence of Chinese milk vetch(CMV) seed under naturally reseeded CMV-rice cropping systems during the period of 2007~2009. Persistence of the CMV seeds were evaluated in the naturally reseeded CMV-rice field on different tillage methods and soil depths based on the seed number recovered and the seed longevity in soil. Field observation in the naturally reseeded CMV rice field showed that as many as 917~2,185 CMV seeds m-2 were found from 0~15cm soil depth in the rotary tillage and 250~10,105 CMV seeds in minimum tillage rice cultivation in autumn. The recovered seed germinated 25~33%, 23~43% but still had high percentage of hard seed having 64~72% and 51~77%. Field experiment showed that the CMV seedling still emerged even after 2 years of continuous destructive killing of emerged CMV plant by rotary tillage in naturally reseeded CMV-rice field, indicating that CMV seeds persistent at least two years in rice field.

Aquimarina litoralis sp. nov., Isolated from a Coastal Seawater

You-Sung Oh,Hyung-Yeel Kahng,Young Sun Lee,Byoung-Jun Yoon,Sang-Bin Lim,정재성,Duck-Chul Oh,Dong-Heon Lee 한국미생물학회 2010 The journal of microbiology Vol.48 No.4

A strictly aerobic, red-pigmented, non-motile, catalase- and oxidase-positive, Gram-staining-negative bacterium,designated strain CNURIC011T, was isolated from seawater off the coast of Jeju Island in Korea. A phylogenetic analysis based on 16S rRNA gene sequences showed that strain CNURIC011T belongs to the genus Aquimarina in the family Flavobacteriaceae. 16S rRNA gene sequence analysis revealed that the close relatives of the novel strain are Aquimarina latercula ATCC 23177T, Aquimarina marcrocephali JAMB N27T,Aquimarina intermedia KMM 6258T, Aquimarina muelleri KMM 6020T, and Aquimarina brevivitae SMK-19T,with sequence similarities of 97.6, 96.6, 96.0, 95.6, and 94.2%, respectively. DNA-DNA hybridization revealed that the level of relatedness between strain CNURIC011T and Aquimarina latercula ATCC 23177T (=KCTC 2912T) was 4.9%. The DNA G+C content was 35.8 mol% and the major respiratory quinone was MK-6. The major fatty acids were iso-C15:0 (14.9%), C15:0 (13.9%), iso-C17:0 3-OH (12.6%), iso-C15:1 G (7.3%), and iso-C17:1ω9c (7.2%). On the basis of phenotypic, phylogenetic, and genotypic data, strain CNURIC011T represents a novel species within the genus Aquimarina, for which the name Aquimarina litoralis sp. nov. is proposed. The type strain is CNURIC011T (=KCTC 22614T =JCM 15974T).

Gaetbulibacter jejuensis sp. nov., Isolated from Seawater

You-Sung Oh,강형일,Byoung-Jun Yoon,Duck-Chul Oh,Jae-Ho Joa,Dong-Heon Lee,Sang-Bin Lim 한국미생물학회 2010 The journal of microbiology Vol.48 No.3

A novel marine bacterium, designated strain CNURIC014T was isolated from coastal seawater of Jeju Island in Korea. Strain CNURIC014T formed yellow colonies on marine agar 2216 and the cells were Gram-negative, non-motile, strictly aerobic, rod-shaped. The temperature, pH and NaCl ranges for growth were 15-37°C, pH 6.0-9.0 and 1.0-7.0% NaCl. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain CNURIC014T was most closely related to Gaetbulibacter marinus and Gaetbulibacter saemankumensis, with a sequence similarity of 95.1% and 94.6%, respectively. The DNA G+C content of the strain was 33.1 mol% and the major respiratory quinone was menaquinone-6. The major cellular fatty acids were iso-C15:1 (22.8%), iso-C15:0 (18.8%), summed feature 3 (iso-C15:0 2-OH/C16:1 ω7c, 12.9%) and iso-C17:0 3-OH (11.5%). On the basis of phenotypic, phylogenetic, and genotypic data, strain CNURIC014T represents a novel species within the genus Geatbulibacter, for which the name Gaetbulibacter jejuensis sp. nov. is proposed. The type strain is CNURIC014T (=KCTC 22615T =JCM 15976T).

Serum IP-10 Levels Correlate with the Severity of Liver Histopathology in Patients Infected with Genotype-1 HCV

You, Chan Ran,Park, Su-Hyung,Jeong, Sung Won,Woo, Hyun Young,Bae, Si Hyun,Choi, Jong Young,Sung, Young Chul,Yoon, Seung Kew The Korean Society of Gastroenterology; the Korean 2011 Gut and Liver Vol.5 No.4

<P><B>Background/Aims</B></P><P>Interferon-γ-inducible protein 10 (IP-10) plays important roles in the pathogenesis of hepatitis C virus (HCV) infection. We investigated the association between serum IP-10 levels and liver pathology in patients with chronic HCV infection.</P><P><B>Methods</B></P><P>The serum IP-10 concentration was assessed in 85 patients with chronic HCV infection using a solid phase sandwich enzyme-linked immunosorbent assay, and a liver biopsy specimen was obtained. The pathology was scored using the Knodell histologic activity index (HAI).</P><P><B>Results</B></P><P>Of the 85 patients, 58 had genotype 1 HCV infection, 21 had genotype non-1, and 6 were undetermined. The serum IP-10 levels did not differ between patients infected with genotype 1 and genotype non-1 (p=0.472). In patients with genotype 1 infection, the total HAI score and the stage of fibrosis were highly correlated with the serum IP-10 level (r=0.555, r=0.578, p<0.001). Furthermore, the serum IP-10 concentrations of patients with severe fibrosis (stages 3, 4) were higher than those of patients with mild fibrosis (stages 0 to 2; 214.4 vs. 72.3 pg/mL, p=0.002) among patients with genotype 1 infection. However, in patients without genotype 1 infection, the histopathology was not associated with the serum IP-10 level. A multivariate analysis showed that serum IP-10 was an independent predictor of fibrosis (stages 3, 4) in patients with genotype 1 infection (odds ratio, 1.034; 95% confidence interval, 1.006 to 1.064; p=0.018).</P><P><B>Conclusions</B></P><P>Serum IP-10 concentration was significantly correlated with the severity of liver histology in genotype 1 HCV infection.</P>

A High Performance Co-design of 26 nm 64 Gb MLC NAND Flash Memory using the Dedicated NAND Flash Controller

You, Byoung-Sung,Park, Jin-Su,Lee, Sang-Don,Baek, Gwang-Ho,Lee, Jae-Ho,Kim, Min-Su,Kim, Jong-Woo,Chung, Hyun,Jang, Eun-Seong,Kim, Tae-Yoon The Institute of Electronics and Information Engin 2011 Journal of semiconductor technology and science Vol.11 No.2

It is progressing as new advents and remarkable developments of mobile device every year. On the upper line reason, NAND FLASH large density memory demands which can be stored into portable devices have been dramatically increasing. Therefore, the cell size of the NAND Flash memory has been scaled down by merely 50% and has been doubling density each per year. [1] However, side effects have arisen the cell distribution and reliability characteristics related to coupling interference, channel disturbance, floating gate electron retention, write-erase cycling owing to shrinking around 20nm technology. Also, FLASH controller to manage shrink effect leads to speed and current issues. In this paper, It will be introduced to solve cycling, retention and fail bit problems of sub-deep micron shrink such as Virtual negative read used in moving read, randomization. The characteristics of retention, cycling and program performance have 3 K per 1 year and 12.7 MB/s respectively. And device size is 179.32 $mm^2$ (16.79 mm ${\times}$ 10.68 mm) in 3 metal 26 nm CMOS.

Clinical Characteristics of Kawasaki Disease in Infants Younger than Six Months: A Single-Center Study

You Min Yoon,Hye Won Yun,Sung Hye Kim 대한심장학회 2016 Korean Circulation Journal Vol.46 No.4

Background and Objectives: Kawasaki disease (KD) is the leading cause of acquired heart disease, which predominantly occurs in children under the age of 5 years. However, there are fewer cases of KD in infants younger than 6 months, which makes it difficult to diagnose. We investigated the clinical manifestations of KD in this age group and compared them with those in the older age group. Subjects and Methods: We retrospectively reviewed the medical records of 239 patients with KD admitted to the Hallym Sacred Heart Hospital from January 2013 to June 2015. The data were categorized into 2 groups by age: Group A (≤6 months, n=26) and Group B (>6 months, n=213). Results: Group A had a longer hospitalization period than Group B (6.69 vs. 5.19 days, p=0.002). Group A had fewer clinical manifestations upon admission, due to which there was a higher incidence of incomplete KD (1.88 vs. 3.54 of the diagnostic criteria, p<0.05; and 19.2% vs. 4.2% incomplete KD incidence, p=0.002). The rate of cardiac complications was higher in Group A (30.8% vs. 11.7%, p=0.011). Conclusion: The rate of cardiac complications of the patients younger than 6 months was significantly higher than that of the older patients. Therefore, infants younger than 6 months with unexplained fever for more than 5 days should be suspected as having KD, even if the principal clinical features are not fully presented. Echocardiography must be appropriately used for diagnosis of KD in suspected patients

Highly efficient blue organic light-emitting diodes using quantum well-like multiple emissive layer structure

Yoon, Ju-An,Kim, You-Hyun,Kim, Nam Ho,Yoo, Seung Il,Lee, Sang Youn,Zhu, Fu Rong,Kim, Woo Young Springer 2014 NANOSCALE RESEARCH LETTERS Vol.9 No.1

<P>In this study, the properties of blue organic light-emitting diodes (OLEDs), employing quantum well-like structure (QWS) that includes four different blue emissive materials of 4,4′-bis(2,2′-diphenylyinyl)-1,1′-biphenyl (DPVBi), 9,10-di(naphth-2-yl)anthracene (ADN), 2-(<I>N</I>,<I>N</I>-diphenyl-amino)-6-[4-(<I>N</I>,<I>N</I>-diphenyl amine)styryl]naphthalene (DPASN), and bis(2-methyl-8-quinolinolate)-4-(phenyl phenolato) aluminum (BAlq), were investigated. Conventional QWS blue OLEDs composed of multiple emissive layers and charge blocking layer with lower highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) energy level, and devices with triple emissive layers for more significant hole-electron recombination and a wider region for exciton generation were designed. The properties of triple emissive layered blue OLEDs with the structure of indium tin oxide (ITO) /<I>N</I>,<I>N</I>′-diphenyl-<I>N</I>,<I>N</I>′-bis(1-naphthyl-phenyl)-(1,1′-biphenyl)-4,4′-diamine (NPB) (700 Ǻ)/X (100 Ǻ)/BAlq (100 Ǻ)/X (100 Ǻ)/4,7-diphenyl-1,10-phenanthroline (Bphen) (300 Ǻ)/lithium quinolate (Liq) (20 Ǻ)/aluminum (Al) (1,200 Ǻ) (X = DPVBi, ADN, DPASN) were examined. HOMO-LUMO energy levels of DPVBi, ADN, DPASN, and BAlq are 2.8 to 5.9, 2.6 to 5.6, 2.3 to 5.2, and 2.9 to 5.9 eV, respectively. The OLEDs with DPASN/BAlq/DPASN QWS with maximum luminous efficiency of 5.32 cd/A was achieved at 3.5 V.</P>

The role of Th17 inflammation in the non-eosinophilic asthma (초)

( Sang Min Lee ),( Hyun Seung Lee ),( So Hee Lee ),( Se Hoon Kim ),( Heung Woo Park ),( Yoon Seok Chang ),( Sun Sin Kim ),( Sang Heon Cho ),( Kyung Up Min ),( You Young Kim ) 대한내과학회 2008 대한내과학회지 Vol.75 No.1S

Effect of rehabilitation on the somatosensory evoked potentials and gait performance of hemiparetic stroke patients

Yoon, Hyun S.,Cha, Young J.,Sohn, Min K.,You, Joshua (Sung) H.,Gó,mez, Carlos,Schwarzacher, Severin P.,Zhou, Huiyu IOS Press 2018 Technology and health care Vol.26 No.1

<P><B>BACKGROUND:</B></P><P>Gait performance of stroke patients is affected by impaired sensory ability. The purpose of the present study was to determine the relationship between somatosensory-evoked potential (SSEP) parameters and gait performance in hemiparetic stroke patients.</P><P><B>METHODS:</B></P><P> A convenience sample of 17 hemiparetic stroke patients (mean age 60.11 [FORMULA OMISSION] 8.83 years; 10 women; right hemiplegia: 10, left hemiplegia: 7) were recruited for the present study. The Electro Synergy system (Viasys Healthcare; San Diego, CA, USA) was used for SSEP evaluation. The 17 patients were assigned to two groups according to their SSEP results as follows: 8 patients to the normal response group and 9 patients to the abnormal group. All the participants underwent the same rehabilitation exercise programs during 4 weeks, followed by clinical evaluation. A mixed-design analysis of a variance model was used to test for differences in timed up-and-go (TUG) test and 10-meter walking test (10MWT) scores between the two independent groups while the participants were subjected to repeated measures (pretest and posttest). </P><P><B>RESULTS:</B></P><P> Analysis of variance revealed the main time effect ([FORMULA OMISSION] 0.05) and group by time interaction effect ([FORMULA OMISSION] 0.05). The post hoc test result confirmed that the normal sensory group showed greater improvement in TUG test and 10MWT scores than the abnormal sensory group ([FORMULA OMISSION] 0.05). The TUG test and 10MWT scores in the posttest were greater in the normal sensory group than in the abnormal sensory group.</P><P><B>CONCLUSIONS:</B></P><P>The present study demonstrated the importance of the clinical contribution of the baseline sensory function of individuals with hemiparetic stroke to their gait performance and recovery after stroke rehabilitation. As anticipated, the individuals who had intact or spared sensory function showed greater improvements in gait speed and performance measures than those who had impaired sensory function.</P>