http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Radiculopathy caused by lumbar epidural varix
Shin Jiyong,Oh Nawon,Huh Jisoon,현창림,Kim Joong-Goo,강사윤,Oh Jung-Hwan 대한신경집중치료학회 2020 대한신경집중치료학회지 Vol.13 No.2
Background: Lumbar epidural varix (LEV) is a very rare condition caused by dilatation of the vertebral venous plexus. LEV can result in lumbosacral radiculopathy, which is often mistaken for lumbosacral herniated intervertebral disc (HIVD). Case Report: A 72-year-old man visited the emergency department (ED) with radiating pain of the right leg that had developed 3 weeks previously. Before the ED visit, he was diagnosed with lumbosacral radiculopathy due to HIVD based on lumbar X-rays at an outpatient clinic. Despite conservative treatment, his symptoms deteriorated. On magnetic resonance imaging at the ED, an epidural cystic mass in the right L5–S1 with multiple HIVDs was observed. The mass was surgically removed, and the histological findings showed a dilated vessel with a thrombus, which led to the final diagnosis of LEV. Conclusion: In lumbosacral radiculopathy, LEV should be considered as a possibility even if degenerative spine disease is observed on lumbar X-rays.
Single-walled carbon nanotube–polystyrene nanocomposites: dispersing nanotubes in organic media
Shin, Jiyong,Kim, Chorong,Geckeler, Kurt E John Wiley Sons, Ltd. 2009 Polymer international Vol.58 No.5
<P>BACKGROUND: The insufficient dispersability of single-walled carbon nanotubes (SWNTs) in most common solvents (as a result of substantial van der Waals tube–tube attractions) makes it difficult to explore and understand their chemistry, and, therefore, implies many limitations for their practical applications. In this study, in order to overcome the intrinsic problems of SWNTs, a facile mechanochemical approach was developed to prepare polystyrene-SWNT nanocomposites, which could be well-dispersed in organic media.</P><P>RESULTS: Here we report a simple method to prepare polystyrene-wrapped single-walled carbon nanotubes, which can be well dispersed in a series of organic solvents. The nanocomposites were prepared in the solid state using the high-speed vibration milling technique and were characterized by UV-VIS and FT-IR spectroscopy. In addition, their morphology was determined by TEM as well as SEM studies.</P><P>CONCLUSION: This facile and simple solid-state reaction technique to prepare SWNT-PS nanocomposites eases not only the preparation of dispersions of SWNTs for further applications like device fabrications, but also in general the production of carbon nanotube-polymer nanocomposites. Furthermore, this facile preparation method to synthesize nanohybrids by a mechanochemical reaction has a superior potential for electronic applications of single-walled carbon nanotubes. Copyright © 2009 Society of Chemical Industry</P>
Jin, Jiyong,Jeong, Sung In,Shin, Young Min,Lim, Kwang Suk,Shin, Heung soo,Lee, Young Moo,Koh, Hyun Chul,Kim, Kyung-Soo Elsevier Science 2009 European journal of heart failure Vol.11 No.2
<P>AIMS: Cardiac tissue engineering has been proposed as an appropriate method to repair myocardial infarction (MI). Evidence suggests that a cell with scaffold combination was more effective than a cell-only implant. Nevertheless, to date, there has been no research into elastic biodegradable poly(lactide-co-epsilon-caprolactone) (PLCL) scaffolds. The aim of this study was to investigate the effect of mesenchymal stem cells (MSCs) with elastic biodegradable PLCL scaffold transplants in a rat MI model. METHODS AND RESULTS: Ten days after inducing MI through the cryoinjury method, a saline control, MSC, PLCL scaffold, or MSC-seeded PLCL scaffold was transplanted onto the hearts. Four weeks after transplantation, cardiac function and histology were evaluated. Transplanted MSCs survived and differentiated into cardiomyocytes in the injured region. Left ventricular ejection fraction in the MSC+PLCL group increased by 23% compared with that in the saline group; it was also higher in the MSC group. The infarct area in the MSC+PLCL group was decreased by 29% compared with that in the saline group; it was also reduced in the MSC group. CONCLUSION: Mesenchymal stem cells plus PLCL should be an excellent combination for cardiac tissue engineering.</P>
Sung Woo Shin,Jiyong Lee,Jeong-Su Kim,Joonwoo Shin 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.17 No.1
The stress dependence of ultrasonic wave velocity is known as the acoustoelastic effect. This effect is useful for stress monitoring if the acoustoelastic coefficient of a subject medium is known. The acoustoelastic coefficients of metallic materials such as steel have been studied widely. However, the acoustoelastic coefficient of concrete has not been well understood yet. Basic constituents of concrete are water, cement, and aggregates. The mix proportion of those constituents greatly affects many mechanical and physical properties of concrete and so does the acoustoelastic coefficient of concrete. In this study, influence of the water-cement ratio (w/c ratio) and the fine-coarse aggregates ratio (fa/ta ratio) on the acoustoelastic coefficient of concrete was investigated. The w/c and the fa/ta ratios are important parameters in mix design and affect wave behaviors in concrete. Load-controlled uni-axial compression tests were performed on concrete specimens. Ultrasonic wave measurements were also performed during the compression tests. The stretching coda wave interferometry method was used to obtain the relative velocity change of ultrasonic waves with respect to the stress level of the specimens. From the experimental results, it was found that the w/c ratio greatly affects the acoustoelastic coefficient while the fa/ta ratio does not. The acoustoelastic coefficient increased from 0.003073 MPa-1 to 0.005553 MPa-1 when the w/c ratio was increased from 0.4 to 0.5. On the other hand, the acoustoelastic coefficient changed in small from 0.003606 MPa-1 to 0.003801 MPa-1 when the fa/ta ratio was increased from 0.3 to 0.5. Finally, it was also found that the relative velocity change has a linear relationship with the stress level of concrete.
Construction of Liouville Brownian motion via Dirichlet form theory
Elsevier 2019 STATISTICS & PROBABILITY LETTERS - Vol.148 No.-
<P><B>Abstract</B></P> <P>The Liouville Brownian motion which was introduced in Garban et al. (2016) is a natural diffusion process associated with a random metric in two dimensional Liouville quantum gravity. In this paper we construct the Liouville Brownian motion via Dirichlet form theory. By showing that the Liouville measure is smooth in the strict sense, the positive continuous additive functional <SUB> ( <SUB> F t </SUB> ) t ≥ 0 </SUB> of the Liouville measure in the strict sense w.r.t. the planar Brownian motion <SUB> ( <SUB> B t </SUB> ) t ≥ 0 </SUB> is obtained. Then the Liouville Brownian motion can be defined as a time changed process of the planar Brownian motion <SUB> B F t − 1 </SUB> .</P>
Kwak, Jiyong,Shim, Jin-Kyoung,Kim, Dong Seok,Lee, Ji-Hyun,Choi, Junjeong,Park, Junseong,Shin, Kyoung-Jin,Kim, Se-Hoon,Kim, Pilnam,Huh, Yong-Min,Kim, Eui Hyun,Chang, Jong Hee,Kim, Sun Ho,Kang, Seok-Gu Spandidos Publications 2016 International journal of oncology Vol.49 No.2
<P>The existence of tumorspheres (TSs) might confer treatment resistance to pineoblastoma (PB). The existence of PB TSs with cellular immortalization potential has not yet been reported. We developed a procedure for isolating TSs from recurrent PB (rPB) and tested whether their properties made them suitable for use as a patient-derived xenograft (PDX). Immunocytochemical staining, RT-PCR and quantitative real-time PCR showed that, among stemness proteins, CD133, musashi and podoplanin were expressed at elevated levels in rPB TSs, but nestin was not. rPB TSs cultured under neuro-glial differentiation conditions expressed TUBB3, but not GFAP, MBP or NeuN. Unlike glioblastoma TSs, rPB TSs showed no clear evidence of invasion in 3D invasion assay or increased expression of genes associated with epithelial-mesenchymal transition. An orthotopic xenograft showed that tumor xenografts replicated the histopathological features of the patient tumor and expressed similar genome profiles, as determined by short tandem repeat genotyping. These data demonstrate the isolation and the characterization of rPB TSs for the first time. Using an orthotopic xenograft, we showed that rPB TSs could replicate the patient tumor, demonstrating their potential as a PDX for precision medicine.</P>