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Multidrug-Resistant Providencia Isolates Carrying blaPER-1, blaVIM-2, and armA
이희우,Hee-Young Kang,신경섭,김정민 한국미생물학회 2007 The journal of microbiology Vol.45 No.3
During May to July 2004, three strains of Providencia spp. with multidrug-resistance (MDR) were isolated from urinary specimen of three patients hospitalized with a same hospital room. By PCR analysis, all three strains have been found to carry both VIM-2 type metallo-β-lactamase gene and PER-1 type extendedspectrum β-lactamase gene. One out of three strains carried additional resistance gene, armA, 16S rRNA methylase gene responsible for high level resistance to aminoglycosides. To our knowledge, this is the first report on the identification of Providencia spp. simultaneously carrying blaVIM-2, blaPER-1, and armA genes.
성인의 의도적 반추와 외상후 스트레스 증상 및 외상후 성장의 관계: 인지적 정서조절 전략의 매개효과
이희우,박기환 학습자중심교과교육학회 2024 학습자중심교과교육연구 Vol.24 No.1
Objectives This study aimed to investigate the mediating role of cognitive emotion regulation(CER) in the relationship between deliberate rumination(DR), posttraumatic stress symptoms(PTSS) and posttraumatic growth(PTG). Methods 496 people completed self-reporting questionnaires: a Trauma Events Checklist, the Korean Version of Event Related Rumination Inventory(K-ERRI), the Korean Version of Impact of Event Scale-Revised(IES-R-K), the Korean Version of Posttraumatic Growth Inventory(K-PTGI), the Korean Version of Cognitive Emotion Regulation Questionnaire(K-CERQ). Results The results showed significant positive correlations among deliberate rumination, maladaptive CER, adaptive CER, PTSS and PTG, although adaptive CER was not significantly correlated with PTSS. As a result of the mediating effect test, a significant partial mediating effect of maladaptive CER was found in the relationship between deliberate rumination and PTSS. In the relationship between deliberate rumination and PTSS, a significant partial mediating effect of adaptive CER was found. The suppression effect of adaptive CER was suggested in the relationship between deliberate rumination and PTSS. In the relationship between deliberate rumination and PTG, a significant partial mediating effect of adaptive CER was found. Conclusions These results suggest that the experience of PTSS or PTG after deliberate rumination depends on the type of cognitive emotion regulation strategies being used.
이희우,신선미,김주자,강세원 한국학교보건학회 2008 韓國學校保健學會誌 Vol.21 No.2
Purpose: To investigate the utilization of medical care benefits of school personnel on duty in Seoul Method: The subjects were 551 workers under Seoul Metropolitan Office of Education(male 301, female 250) who got medical care benefits from March 2000 to February 2005. To analyze the data. frequency chi-square test and t-test by SAS package 9.12 were used Result: The results show that elementary school personnel got the highest ranking, 314(57.0%) Among subjects 57.2% personnel got accident when they were working on their own duty, 21% during school events and 13.5% were during commutes They got medical care from orthopedics 75.9% neurosurgery 7.6% dental 4% and 8 male and 2 female died during these days The most frequent diseases of males and female were fracture and joints related disease The reason of most health problem was due to injury(92.3%) Conclusion: The results of this study suggest that the continuous health care services like regular health check for school personnel, or social safety network to prevent injury are needed.
데이터 마이닝을 이용한 서울시 교직원의 피로요인 탐색연구
이희우,신선미 한국학교보건학회 2006 韓國學校保健學會誌 Vol.19 No.2
Purpose : To identify general characteristics of school personnel with recent fatigue which was the most frequent symptom among subjective symptoms and to explore fatigue-related factors by evaluating physical and perceived health status, life style, and symptoms through data mining techniques. Methods : We collected a data of the 1,147(male 545, female 602) who were elementary, middle, or high school personnel, answered a questionnaire, and received physical examination in Seoul School Health Center from September to November in 2000. And we investigated the differences between fatigue group and non-fatigue group for demographic characteristics, physical health status, perceived health status, symptoms, and laboratory values by frequency, chi-square test, t-test, or simple logistic regression analysis by SAS package 8.1, and then selected significant variables as input variables of a decision tree analysis of CART model by SAS E-miner. Results : In general characteristics, the fatigue consisted of 41.1%(male 35.2%, female 46.4%) among 1,147 school personnel. In classical statistics, factors related with fatigue were female, lower means of systolic and diastolic pressure, young age, personnel in middle school, irregular eating habit, no exercise a week or less than 30minutes exercise a day, perception of unhealthy status, and subjective symptoms including short of breath at exercise. In simple logistic regression to examine the relationship between selected independent variables and fatigue as a dependent variable, the odds ratio of gender (female vs male) was 1.58 times, and young age ( 20s vs 60s) 20.67 times, and middle vs high school personnel 1.86 times. However, we mined combined several characteristics by SAS-E miner. In CART model, if health perception was healthy, and age was >= 37.5 years, the proportion of the fatigue was only 19.3%. but if health perception was not healthy and symptom was severe 'short of breath' during exercise and age was < 53.5 years, and BMI was >= 22.69, the proportion of the fatigue was up to 84.8%. Conclusions : The fatigue consisted of 41.1%(male 35.2%, female 46.4%). In classical statistics, fatigue-related factors among school personnel were young age, female gender, perceived unhealthy status, subjective physical symptoms, poor life-style, and lower blood pressure rather than only physical health status. However, in data mining, if health perception was healthy and age was >= 37.5 years, the proportion of the fatigue was only 19.3%. but if health perception was not healthy and symptom was severe 'short of breath' during exercise and age was < 53.5 years, and BMI was >= 22.69, the proportion of the fatigue was up to 84.8%.
Ti-(45-X)Ni-5Cu-X(Mo,Cr,Al)(at.%) 합금의 B2-B19-B19` 변태거동 및 형상기억특성
李喜佑,崔美善,金載勳,南泰鉉 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.6
Transformation behavior and shape memory characteristics in Ti-(45-X)Ni-5Cu-X(Mo, Cr, Al)(at.%) alloys were investigated by means of differential scanning calorimetry, X-ray diffraction and thermal cycling tests under a constant load. The substitution of Mo, Cr and Al for Ni in Ti-45Ni-5Cu alloy induced the B2→B19 martensitic transformation prior to the B2→B19' transformation, and consequently Ti-(45-X)Ni-5Cu-X(Mo, Cr, Al)(at.%) alloys transformed in two stages; the B2→B19→B19'. The B2→B19 and the B19→B19' transformations were completely separated in Ti-(45-X)Ni-5Cu-X(Mo, Cr) alloys, whereas they were not done in a Ti-44.3Ni-5Cu-0.7A1 alloy without applied stress. The substitution of Mo, Cr and Al in a Ti-45Ni-5Cu alloy decreased transformation hysteresis and the residual elongation. The maximum recoverable elongation of Ti-(45-X)Ni-5Cu-X(Mo, Cr, Al) alloys was about 5%.
High-throughput fabrication of TERS probes using DC bias
이희우,정진영,김현태,박웅규,최수봉 한국물리학회 2021 Current Applied Physics Vol.32 No.-
Tip-enhanced Raman spectroscopy (TERS) has gained great attentions for sensitive characterization and superresolution chemical imaging of various materials. The performance of TERS is mainly affected by the probe geometry, such as the diameter of the tip apex, surface roughness, etc. In this regard, the fabrication of a sharp apex from metal wire is the one of the most important factor for TERS experiments. Conventionally, the electrochemical etching is commonly used technique for fabricating those metallic probes. To avoid the surface defects, the pulsed bias was commonly employed in the electrochemical etching process. However, it would make the fabrication system to be complex and sophisticated. Here, we report an simple automated electrochemical etching systems using DC bias for the efficient fabrication of TERS probes. With our optimized condition for DC electrochemical etching, gold probes with a clean surface and a radius of curvature below 200 nm can be obtained with yield of 85%. The fabricated metallic probe is used to detect the brilliant cresyl blue (BCB) molecules on the gold film, and it is confirmed that the enhancement factor is about 3,400.