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Kwon, Yong Jun,Shin, Jong Hee,Byun, Seung A,Choi, Min Ji,Won, Eun Jeong,Lee, Dain,Lee, Seung Yeob,Chun, Sejong,Lee, Jun Hyung,Choi, Hyun Jung,Kee, Seung Jung,Kim, Soo Hyun,Shin, Myung Geun American Society for Microbiology 2019 Journal of clinical microbiology Vol.57 No.4
<P><I>Candida auris</I> is an emerging worldwide fungal pathogen. Over the past 20 years, 61 patient isolates of <I>C. auris</I> (4 blood and 57 ear) have been obtained from 13 hospitals in Korea.</P><P><I>Candida auris</I> is an emerging worldwide fungal pathogen. Over the past 20 years, 61 patient isolates of <I>C. auris</I> (4 blood and 57 ear) have been obtained from 13 hospitals in Korea. Here, we reanalyzed those molecularly identified isolates using two matrix-assisted laser desorption ionization–time of flight mass spectrometry (MALDI-TOF MS) systems, including Biotyper and Vitek MS, followed by antifungal susceptibility testing, sequencing of the <I>ERG11</I> gene, and genotyping. With a research-use-only (RUO) library, 83.6% and 93.4% of the isolates were correctly identified by Biotyper and Vitek MS, respectively. Using an <I>in vitro</I> diagnostic (IVD) library of Vitek MS, 96.7% of the isolates were correctly identified. Fluconazole-resistant isolates made up 62.3% of the isolates, while echinocandin- or multidrug-resistant isolates were not found. Excellent essential (within two dilutions, 96.7%) and categorical agreements (93.4%) between the Clinical and Laboratory Standards Institute (CLSI) and Vitek 2 (AST-YS07 card) methods were observed for fluconazole. Sequencing <I>ERG11</I> for all 61 isolates revealed that only 3 fluconazole-resistant isolates showed the Erg11p amino acid substitution K143R. All 61 isolates showed identical multilocus sequence typing (MLST). Pulsed-field gel electrophoresis (PFGE) analyses revealed that both blood and ear isolates had the same or similar patterns. These results show that MALDI-TOF MS and Vitek 2 antifungal susceptibility systems can be reliable diagnostic tools for testing <I>C. auris</I> isolates from Korean hospitals. The Erg11p mutation was seldom found among Korean isolates of <I>C. auris</I>, and multidrug resistance was not found. Both MLST and PFGE analyses suggest that these isolates are genetically similar.</P>
Lee Dain,Kwon Sungmoon,Kim Hyoungkwang,Lee Ju Young,Ryu Byung-Han 대한감염학회 2023 Infection and Chemotherapy Vol.55 No.1
Multisystem inflammatory syndrome in adults (MIS-A) is a rare sequelae after coronavirus disease 2019 (COVID-19) that is characterized by fever as well as cardiovascular and gastrointestinal disorders. We present the case of an 80-year-old Korean woman with MIS-A who experienced febrile sensations, dyspnea, and whole body pain for 7 weeks after being diagnosed with COVID-19. Initial evaluation revealed heart failure, left pleurisy, and sensory neuropathy, but no evidence of infectious diseases was found. Her symptoms improved quickly after starting systemic glucocorticoid therapy, and inflammatory marker levels decreased. When treating patients with fever after COVID-19, it is critical to suspect MIS-A as one of the differential diagnoses for timely diagnosis and treatment.
권귀성(Kwisung Kwon),박다인(Dain Park),김영현(Younghyeon Kim),유상석(Sangseok Yu) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.1
E100연료를 사용하는 차량에서는 연료를 이송하는 연료펌프의 입구단 내구성 확보와 베이퍼 록 현상을 막기 위해 액체 이송용 제트 펌프를 사용하고 있다. 연료 특성 상 기존 가솔린 대비 점도가 높아서 제트 펌프의 송출 능력 최적화를 위한 기술 개발이 필요하다. 본 연구에서는 E100연료를 송출하는 제트 펌프의 송출 특성을 분석하기 위한 3차원 전산 해석 모델을 개발하고자 한다. 액체 연료를 사용하기 때문에 구동측 노즐부를 통과하며 공동현상이 발생할 수 있기 때문에 본 전산해석 모델에서는 4가지 공동 현상 모델을 비교 검증하여 최종적으로 Zwart-Gerber-Belamri(ZGB) 모델을 선정하였다. 노즐 목비, 구동 유체 유입각, 노즐 직경비, 노즐 거리비 등 4개 파라메터를 대상으로 가솔린 연료와 E100연료로 사용하는 제트펌프에 대하여 성능 특성을 확인하였다. E100연료의 경우 가솔린보다 점도가 높아서, 노즐 직경비와 거리비에 의한 성능 영향 만 있고 다른 두 개의 파라메터에 대한 성능 변화는 무시할 만한 수준이었다. In a flex fuel vehicle, E100 fuel is flows into the chamber of the fuel pump via a jet pump. This confirms that the pump is free from vapor lock and maintains a long-lasting durability. As the viscosity of E100 fuel is higher than gasoline, the jet pump must be redesigned for the E100 fuel. In this study, a 3-dimensional simulation is developed to analyze the performance variation of a jet pump for two different fuels with four parameters. The simulation includes a Zwart-Gerber-Belamri (ZGB) cavitation model so that cavitation can be observed with the high nozzle flow rate. After carrying out the simulation at two different fuels with four parameters, it is shown that the performance of the jet pump with E100 fuel is very sensitive to the nozzle diameter ratio and nozzle distance ratio. However, the other two parameters result in a minor change in the flow ratio (second flow/primary flow).
Ultrasound Image Stitching Algorithm to Identify Anatomical Risk Factors for Lateral Epicondylitis
Seokki Kim(김석기),Dain Kwon(권다인),Yeseop Park(박예섭),Youkeun Oh(오유근) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In general, structures with acute angles are vulnerable to stress concentrations. These structures can be found in the tendon/ligament-to-bone interface, known as enthesis. Our previous study showed that the stress concentration occurred near the ACL femoral enthesis. This implies that ACL injuries could occur if loading cycles above a certain level of threshold are repeated. The extensor tendons of forearm have a similar insertion structure. It is pulled and lifted when the extensor muscle of the forearm contracts. Therefore, if the forearm is overused due to repetitive or strenuous activities, it could be damaged by a mechanism similar to the ACL injuries at the femoral enthesis. However, these injuries require the use of expensive equipment (MR image, radiograph) in a limited environment for diagnosis. In this study, experiments are conducted to observe through a portable ultrasound scanner. The ultrasound (US) image can directly grasp the shape of the muscle, and the structural causes of tennis elbow can be observed. We propose an algorithm to conveniently observe the appearance of muscles and tendons using an ultrasound scanner. US images of the forearm extensor tendons from 5 experimental participants are obtained. The images are stitched into a panoramic image, then images are analyzed to measure the angle between the extensor tendon and bone surface.
Chae Hyojin,Sung Pil Soo,Choi Hayoung,Kwon Ahlm,Kang Dain,Kim Yonggoo,Kim Myungshin,Yoon Seung Kew 대한진단검사의학회 2021 Annals of Laboratory Medicine Vol.41 No.2
Background: Hepatocellular carcinoma (HCC) is the second-most-common cause of cancer-related deaths worldwide, and an accurate and non-invasive biomarker for the early detection and monitoring of HCC is required. We assessed pathogenic variants of HCC driver genes in cell-free DNA (cfDNA) from HCC patients who had not undergone systemic therapy. Methods: Plasma cfDNA was collected from 20 HCC patients, and deep sequencing was performed using a customized cfDNA next-generation sequencing panel, targeting the major HCC driver genes (TP53, CTNNB1, TERT) that incorporates molecular barcoding. Results: In 13/20 (65%) patients, we identified at least one pathogenic variant of two major HCC driver genes (TP53 and CTNNB1), including 16 variants of TP53 and nine variants of CTNNB1. The TP53 and CTNNB1 variants showed low allele frequencies, with median values of 0.17% (range: 0.06%-6.99%) and 0.07% (range: 0.05%–0.96%), respectively. However, the molecular coverage of variants was sufficient, with median values of 5,543 (range: 2,317–9,088) and 7,568 (range: 2,400–9,633) for TP53 and CTNNB1 variants, respectively. Conclusions: Our targeted DNA sequencing successfully identified low-frequency pathogenic variants in the cfDNA from HCC patients by achieving high coverage of unique molecular families. Our results support the utility of cfDNA analysis to identify somatic gene variants in HCC patients.