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Delayed Massive Expansion of Subgaleal Hematoma Complicated with Proptosis in Hemophilia B
Seon-Yeop Kim,Han Gyu Cha,Sun Young Jang,Sun-Chul Hwang 대한신경손상학회 2021 Korean Journal of Neurotrauma Vol.17 No.2
Proptosis after a subgaleal hematoma (SGH) is a rare condition that may require immediate intervention to prevent visual loss. A 12-year-old boy presented with localized SGH in the left parietal area after hair-pulling. The SGH was massively expanded on the entire scalp on the 3rd day of the trauma. On the next day after the massive expansion, proptosis of the right eye occurred suddenly. Emergent needle aspiration of the SGH was performed, and the proptosis improved slightly. Fortunately, his vision did not deteriorate. After all, he was diagnosed with coagulation factor IX deficiency (hemophilia B). The supraorbital notch could be a passage of the SGH to extend into the subperiosteal space of the orbit.
Seon-Yeop Kim,이호준,Dong-Seong Shin,Bum-Tae Kim 대한뇌혈관외과학회 2022 Journal of Cerebrovascular and Endovascular Neuros Vol.24 No.3
Objective: The present study aimed to analyze the correlation between platelet-tolymphocyte ratio (PLR) and platelet-to-neutrophil ratio (PNR) with prognosis of patients who underwent mechanical thrombectomy (MT). Methods: A total of 432 patients was included, PLR and PNR were calculated from laboratory data on admission. Prognosis was evaluated with a modified Rankin Scale at 3 months after MT. Using receiver operating characteristic (ROC) analysis, optimal cutoff values of PLR and PNR were identified to predict the prognosis after MT. Multivariate analyses were performed to identify the relationship of PLR and PLR with prognosis of MT. Results: Patients with favorable outcomes had a lower mean PLR (135.0, standard deviation [SD] 120.3) with a higher mean PNR (47.1 [SD] 24.6) compared with patients with unfavorable outcomes (167.6 [SD] 139.3 and 35.4 [SD] 22.4) (p<0.001 and <0.001, respectively). In ROC analyses, the optimal cutoff value of PLR and PNR to predict the 3 months prognosis were 145 and 41, respectively (p=<0.001 and p=0.006). In multivariate analysis, PLR less than 145 (odds ratio [OR] 1.29, 95% confidence interval [CI] 1.06–2.06; p=0.016) and PNR greater than 41 (OR 1.22, 95% CI 1.10–1.62; p=0.022) were predictors of favorable outcome at 3 months. Conclusions: In patients with MT, PLR and PNR on admission could be predictive factors of prognosis and mortality at 3 months. Decreased PLR and increased PNR were associated with favorable clinical outcome 3 months after MT.
김선엽(Seon Yeop Kim),황성훈(Seong-hoon Hwang) 한국아동학회 2019 아동학회지 Vol.40 No.2
Objectives: This study was conducted to develop and validate the Dichotomous Thinking Index for Children (DTI-C). Methods: Data was collected from a sample of 4th, 5th and 6th grade students at elementary schools located in Gyeonggi-do. The preliminary version of the DTI-C contained 18 items and was administered to 271 children. After a series of analyses, 15 items were retained. The validity of these items was cross verified in another 200 children. Data was analyzed through exploratory and confirmatory factor analysis, and a correlation analysis. Results: Exploratory factor analysis and the following confirmatory factor analysis revealed a four-factor structure consisting of ‘extreme decision’, ‘success or failure’, ‘social splitting’, and ‘dichotomous thinking in verbalization’. Cronbach’s α ranged from .85 to .87, indicating a proper level of internal consistency. Concurrent validity was established through the significant correlation of the DTI-C with measures of depression, anxiety, and self-esteem. Conclusion: Considering its reliability and validity, the DTI-C developed and evaluated in this study could serve as a useful tool for assessing dichotomous thinking in elementary school students.
최적열차 운행계획을 수립하기 위한 운전이론 영향인자 분석
김선엽(Seon-Yeop Kim),김성준(Seong-Jun Kim),한동현(Dong-Hyun Han),정덕수(Duck-Soo Jeong),이준형(Jun-Hyung Lee),한재현(Jae-Hyeon Han),박정수(Jung-Soo Park),유가현(Ga-Hyun You) 한국철도학회 2019 한국철도학회 학술발표대회논문집 Vol.2019 No.5
4차 산업혁명과 과학기술의 발달에 힘입어 열차의 동력원이 증기, 디젤, 전기, 자기부상, 진공튜브 순으로 발달하고 있으며 또한 철도시설물의 개량 및 발전으로 열차 운행속도는 더욱더 빨라져 운전이론에 따른 열차운전계획이 매우 중요한 시점이다. 현대사회에서 인구증가와 고객 편의 향상을 위해 열차의 짧은 배차간격 · 대용량 수송의 필요함이 증대되면서 운영의 효율성 측면과 철도사고의 위험성 측면에서도 더욱 안전하고 합리적 · 경제적인 열차운행계획 정립이 필요하다. 따라서 본 연구에서는 운전역학, 운전이론, 속도정수, 운전계획 등 효율적인 열차운행계획에 영향을 주는 운전이론 영향인자를 분석하여 안전을 최우선으로 하는 최적의 운전계획수립에 기여코자 한다.
Jung, Seon Yeop,Ahn, Kyung Hyun Elsevier 2019 Journal of membrane science Vol.572 No.-
<P><B>Abstract</B></P> <P>In this study, the transport and deposition of colloidal particles onto a patterned membrane surface are analyzed by both numerical simulation and experiment. The channel Reynolds number (Re) and the size ratio of the particle to the pattern (a/h) are chosen as the major simulation parameters. With an increase in Re and a/h, the number of deposited particles decreases and the rate of permeate flux decline is reduced. Under certain specific combinations of the design parameters, the suspended particles are impeded to access the patterned membrane surface. Based on the particle trajectory analysis, it is claimed that “inaccessible zones”, where the suspended particles cannot be accessed by the flow, are formed near the patterned membrane surface, with the increase in Re and a/h. Cross-flow microfiltration experiments using a poly(methyl methacrylate) (PMMA) particle suspension are also conducted to verify the trend in particle deposition observed in simulation. As the radius of the PMMA particle increases, the number of deposited particles is reduced and the critical flux for the onset of the particle deposition is increased, which qualitatively matches well with simulation. It is found that a patterned membrane can reduce tremendous amounts of colloidal fouling by prohibiting the access of the suspended particles to the membrane surface with the appropriate choice of design parameters such as Re and a/h.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Particle deposition onto a patterned membrane is analyzed by both numerical simulation and experiment. </LI> <LI> The number of deposited particles is closely related with the cross-flow velocity and the particle size. </LI> <LI> The inaccessible zone, where a particle cannot be accessed by the flow, is identified to be formed in the valley. </LI> <LI> The area of the inaccessible zone is increased with the cross-flow velocity and the particle size. </LI> <LI> SEM images and critical flux measurement verify the effect of particle size onto the fouling mitigation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>