압력비에 따른 2차원 초음속 터빈의 유동특성에 대한 실험적 연구

조종재,김귀순,김진한,이은석 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1

본 연구에서는 초음속 충동형 터빈의 유동특성을 알아보기 위해 소형 초음속 풍동을 설계 하였으며 Single pass Schlieren system을 이용하여 유통을 가시화하였다. 실험은 2차원 초음속 노즐과 익렬을 조합하여 압력비에 따라 실시하였다. 실험을 통해 충격파를 포함한 복잡한 유동 형태와 노즐-익렬, 충격파-경계층 상호작용 등을 관찰할 수 있었다. In this paper, a small supersonic wind tunnel is designed and built to study the flow characteristics of a supersonic impulse turbine. The flow is visualized by means of a single pass Schlieren system. The supersonic cascade with 2-dimensional supersonic nozzle was tested over a wide range of pressure ratio. Highly complicated flow patterns including shocks, nozzle-cascade interaction and shock boundary layer interactions are observed.

환자만족도 조사설문지의 설문문항 배열에 따른 신뢰도 분석

최귀선,조우현,홍재석,이선희,강명근 한국의료QA학회 2000 한국의료질향상학회지 Vol.7 No.2

Objectives : The purpose of this study was to evaluate the reliability of questionnaire according to item arrangement on patient satisfaction questionnaire. Methods : We developed the two types of questionnaire with different item arrangement. In the first type (A), questions were arranged according to medical service dimensions. Questions in the second type (B) were arranged according to medical process. Both questionnaires were composed of six dimensions: physical environments, process, competence, courtesy, information giving, understanding patients. Measurements were performed on a 5-score Likert scale. In an outpatients and inpatient survey, total 777 patients answered the type A (outpatients: 257, inpatients: 128) or Type B (outpatients: 257, inpatients: 135). In order to compare the internal consistency of two types. Cronbach's α were calculated. Multiple regression analysis was also performed to know which type of questionnaire explain more of the overall satisfaction. Results : In outpatient survey, type A questionnaire showed higher internal consistency than B except physical environments dimension. Also in inpatient survey, type A had higer internal consistency than B in four dimensions(process, competence, courtesy, understanding patients). In the results of multiple regression analysis, type A questionnaire (R² =0.53) explained more of the variation in overall satisfaction then B questionnaire (R2=0.43) in outpatient survey. In inpatient survey, type B questionnaire (R²=0.40) explained, more of the variation in overall satisfaction than type A questionnaire (R² =0.33).But the.difference of R was not significant in inpatient survey. Conclusion : The results of this study support that type A questionnaire has higer reliability in assessment of consumer satisfaction than type B.

감나무탄저병에서 분리한 Gloeosporium kaki의 2계통

崔貞植,李貴宰,金炯武,蘇仁永 全北大學校 1993 論文集 Vol.35 No.-

A anthracnose symptom at persimmon tree was found out in the field, Chonju in Chonbuk province and Haenam Experiment Station in Chonnam province in 1991 and 1992. The cultivated character and the pathogenicity of the fungi were as follows : These fungi, Gloeosparium kaki which were isolated from the anthracnose were classified into strain Ⅰ and Ⅱ by the cultivated characteristics. The size of conidia in strain Ⅰ was 22.5 × 6.82 ㎛ and that of strain Ⅱ was 20.3 × 6.2 ㎛. In a PDA, the colour of strain I was light brown and made a central zone. The colour of strain Ⅱ was black brown and deep grey and didn't make a central zone. The pathogenicity of strain Ⅰ was similar to strain Ⅱ in the leaf, branches.

Molecular Mechanism of Tetrabromobisphenol A (TBBPA)-induced Target Organ Toxicity in Sprague-Dawley Male Rats

Jae Seok Choi,Young Jun Lee,Tae Hyung Kim,Hyun Jung Lim,Mee Young Ahn,Seung Jun Kwack,Tae Seok Kang,Kui Lea Park,Jaewon Lee,Nam Deuk Kim,Tae Cheon Jeong,Sang Geum Kim,Hye Gwang Jeong,Byung Mu Lee,Hyun 한국독성학회 2011 Toxicological Research Vol.27 No.2

Brominated flame retardants (BFRs) are present in many consumer products ranging from fabrics to plastics and electronics. Wide use of flame retardants can pose an environmental hazard, which makes it important to determine the mechanism of their toxicity. In the present study, dose-dependent toxicity of tetrabromobisphenol A (TBBPA), a flame retardant, was examined in male prepubertal rats (postnatal day 18) treated orally with TBBPA at 0, 125, 250 or 500 ㎎/㎏ for 30 days. There were no differences in body weight gain between the control and TBBPA-treated groups. However, absolute and relative liver weights were significantly increased in high dose of TBBPA-treated groups. TBBPA treatment led to significant induction of CYP2B1 and constitutive androstane receptor (CAR) expression in the liver. In addition, serum thyroxin (T4) concentration was significantly reduced in the TBBPA treated group. These results indicate that repeated exposure to TBBPA induces drug-metabolising enzymes in rats through the CAR signaling pathway. In particular, TBBPA efficiently produced reactive oxygen species (ROS) through CYP2B1 induction in rats. We measured 8-hydroxy-2’-deoxyguanosine (8-OHdG), a biomarker of DNA oxidative damage, in the kidney, liver and testes of rats following TBBPA treatment. As expected, TBBPA strongly induced the production of 8-OHdG in the testis and kidney. These observations suggest that TBBPA-induced target organ toxicity may be due to ROS produced by metabolism of TBBPA in Sprague-Dawley rats.

Morphology and Molecular Phylogeny of Pseudocercospora fatouae Associated with Hypophyllous Leaf Mold on Fatoua villosa in Korea

Lee Kui-Jae,Choi In-Young,Abasova Lamiya,Choi Joon-Ho,Park Jung-Hee,Shin Hyeon-Dong 한국균학회 2023 韓國菌學會誌 Vol.51 No.2

Dark brown leaf molds growing in a vein-limited pattern have been continuously observed on the lower leaf surface of Fatoua villosa in Korea. Fifteen samples deposited in the Korea University herbarium were examined for fungal morphological characterization. Two monoconidial isolates were obtained in 2022, and molecular analysis was performed based on a combined multigene dataset of the internal transcribed spacer (ITS) region and partial actin (actA), translation elongation factor 1-alpha (tef1), and DNA-directed RNA polymerase II second-largest subunit (rpb2). Based on morphological features and molecular phylogenetic analysis, the fungus Pseudocercospora fatouae was identified. To the best of our knowledge, it is the first study reporting the presence of P. fatouae on F. villosa in Korea.

Sequence Analysis of the 3'-Terminal Regions of RNA 1 of Korea lsolates of Barley Yellow Mosaic Virus

Lee, Kui Jae,Park, Jong Chul,Lee, Young Hoon,Lee, Doo Ku,Choi, Min Kyung,Lee, Wang Hyu 전북대학교 농업과학기술연구소 2002 農大論文集 Vol.33 No.1

Barley yellow mosaic virus (BaYMV) and barley mild mosaic virus (BaMMV) bymoviruses, both transmitted in soil by the root-infecting fungus Polymyxa graminis, are responsible for the economicalally importan yellow mosaic disease of winter barley in East Asia and Europe (Huth et al., 1984; Huth and Adams, 1990; Kashiwazaki et al., 1998). They have a bipartite genome comprising two 3'-polyadenylated ssRNA molecules of 7.6kb(RNA 1) and 3.5-3.7kb (RNA2)(Huth et al. 1984; Kashiwazaki et al. 1989; Kashiwazaki and Ogawa; 1989). Key words: barley yellow mosaicirus, Bumovirus, nucleotide sequence, RNA 1, capsid protein.

Complete Genome of Methicillin-Resistant Staphylococcus epidermidis Z0118SE0272 Isolated from a Residential Environment

Lee Haeseong,Oh Jae-Young,Lee Kui Jae,Chae Jong-Chan 한국미생물·생명공학회 2023 한국미생물·생명공학회지 Vol.51 No.4

Staphylococcus epidermidis is a normal flora of human skin and is occasionally associated with pathogenic infections. We report the complete genome sequence of methicillin-resistant Staphylococcus epidermidis strain Z0118SE0272 isolated from the residential environment sharing by a companion dog and dwellers. Resistance to cefoxitin was observed in the strain, whereas it was susceptible to erythromycin, clindamycin, quinupristin-dalfopristin, trimethoprim-sulfamethoxazole, mupirocin, vancomycin, teicoplanin, linezolid, and tigecycline. The strain Z0118SE0272 identified as sequence type 130 possessed the mecA gene responsible for methicillin resistance, which composed the new type of staphylococcal cassette chromosome mec elements lacking mecRI.

Effectiveness of Interventions to Increase the Participation Rate of Gastric Cancer Screening in the Republic of Korea: a Pilot study

Lee, Myung-Ha,Lee, Yoon-Young,Jung, Da-Won,Park, Bo-Young,Yun, E-Hwa,Lee, Hoo-Yeon,Jun, Jae-Kwan,Choi, Kui-Son Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.3

This study assessed the effectiveness of three intervention strategies to improve the participation rate of gastric cancer screening among people who had never undergone such screening, and those who had been screened for the disease, but not recently. It was conducted in the Ilsandong-gu District of Goyang City, Korea. The population for the current study was restricted to male residents, aged 40-65 years, who received an invitation letter to undergo gastric cancer screening from the National Health Insurance (NHI) Corporation at the beginning of 2010. The subjects were divided into two categories according to their screening history: never-screened, and ever-screened. A total of 2,065 men were eligible: 803 never-screened and 1,262 ever-screened. In each screening category they were randomly assigned to one of three intervention groups: 1) tailored telephone counseling; 2) tailored postcard reminder after tailored telephone counseling;and 3) tailored telephone counseling after tailored postcard reminder. At 3 months post-intervention, never-screened men with any intervention were more likely to undergo gastric cancer screening (OR=2.75, 95% CI: 1.22-6.18) compared to those in the reference group (no intervention). However, there was no statistically significant intervention effect in ever-screened men (OR=1.21, 95% CI: 0.65-2.27). Examination of the intervention effects by intervention group among never-screened men showed that those in the postcard reminder after telephone counseling group to be statistically significantly more likely to undergo gastric cancer screening (OR=4.49, 95% CI: 1.79-11.29) than the reference group (no intervention). Our results highlight that use of tailored postcard reminders after tailored telephone counseling is an effective method to increase participation in gastric cancer screening among men who had never been screened.

High frequency plant regeneration from mature embryos of an elite barley cultivar (Hordeum vulgare L. cv Baegdong)

Lee Kui-Jae,Wtpsk Senarath,Lee Wang-Hyu 한국자원식물학회 2003 한국자원식물학회 학술심포지엄 Vol.2003 No.-

Capsid Protein Gene-Mediated Resistance to Barely Yellow Mosaic Virus and Barely Mild Mosaic Virus in Transgenic Barely

Lee Kui-Jae,Park Min-Kyung,Rha Eui-Sik,Lee Wang-Hyu 한국자원식물학회 2003 한국자원식물학회 학술심포지엄 Vol.2003 No.-

Leaf discs and apical meristems were cultured in Murashige and Skoog (MS) medium supplemented with cytokinin and auxin at different concentrations. Callus production was observed in all tested media after six days of incubation. Callus produced in the presence of high concentration of NAA (2.0mg/1) was fragile in texture and yellow in colour. Highest callus formation was observed from leaf discs in the medium supplemented with 1.0mg/1 NAA and 0.5 mg/l BAP in dark at <TEX>$25{\pm}1{\circ}C$</TEX>. Percentage of callus formation was 95% and mean callus fresh weight was 654.88 43.53 mg. Shoots were induced from the callus after 4 weeks in 1/2MS medium supplemented with BAP and kinetin both at 0.5mg/1. When elongated shoots were separated and transferred into multiplication medium (MS+0.5mg/1 BAP+0.5mg/1 kinetin) multiplication rate was 6.4 after 6 weeks. Higher concentrations of BAP caused callus production at the base. Direct shoot induction was observed from apical meristems in MS medium in the presence of 0.175 mg/1 IAA + 2.25mg/1 BAP and 0.175 mg/1 IAA + 3.0 mg/1 BAP in 16 hour day at <TEX>$25{\pm}1{\circ}C$</TEX>. Explants (apical meristems) elongated to form a single shoot forming a callus at the base. Adventitious buds were sprouted out from the base. Percentage explants which producing shoots was 28.57 and 65.5 respectively. Multiple shoot induction was also observed in the same media. Highest multiple shoot production was observed in the presence of 0.175 mg/l IAA and 3.0mg/l BAP, Mean number of shoots per explant was 5.36 and the mean shoot length was <TEX>$16.66{\pm}4.15$</TEX>mm. Shoots (20 30m length) were tested for root induction. Excised shoots were transferred into rooting media, which contains different concentrations of NAA and IAA. Best rooting performance was observed in 1/2MS medium supplemented with 0.1mg/1 NAA after 10 days of incubation in 16 hr photoperiod at <TEX>$25{\pm}1{\circ}C$</TEX>. Mean number of roots per shoot was 6 and the mean ro