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Numerical Study on Characteristics of Turbulent two-phase Gas-Particle Flow using Multi-fluid Model
Dongho Min,Kyungbeom Yoon,Heechul Chang,김태국 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.7
The purpose of this research is to study numerically the turbulent gas-particle two-phase flow characteristics using the Eulerian-Eulerian method. A computer code is developed for the numerical study by using the k -ε - kp two-phase turbulent model. The developed code is applied for particle-laden flows in which the particle volume fraction is between n 10−5 and 10−2 for the Stokes numbers smaller than unity. The gas and particle velocities and the particle volume fraction obtained by using this code are in good agreement with those obtained by a commercial code for the gas-particle jet flows within a rectangular enclosure. The gas-particle jet injected into a vertical rectangular 3D enclosure is numerically modeled to study the effect of the Stokes number, the particle volume fraction and the particle Reynolds numbers. The numerical results show that the Stokes number and the particle volume fraction are important parameters in turbulent gas-particle flows. A small Stokes number ( St ≤ 0.07) implies that the particles are nearly at the velocity equilibrium with the gas phase, while a large Stokes number ( St ≥ 0.07) implies that the slip velocity between the gas and particle phase increases and the particle velocity is less affected by the gas phase. A large particle volume fraction ( p α ≥ 0.0001) implies that the effect of the particles on the gas phase momentum increases, while a small particle volume fraction ( p α ≤ 0.0001) implies that the particles would have no or small effect on the gas flow field. For fixed Stokes number and particle volume fraction, an increase of the particle Reynolds number results in a decrease of the slip velocity between the gas and particle velocities.
Kim, Min Kyu,Shin, Su-Jin,Lee, Hyun Min,Choi, Hong Seo,Jeong, Jaemin,Kim, Hyunsung,Paik, Seung Sam,Kim, Mimi,Choi, Dongho,Ryu, Chun Jeih Elsevier 2019 Cancer letters Vol.454 No.-
<P><B>Abstract</B></P> <P>Hepatocellular carcinoma (HCC) is currently the third leading cause of cancer death worldwide. To study how mycoplasma infection affects HCC progression, we investigated the characteristics of mycoplasma-infected tumor tissues and circulating tumor cells (CTCs) in HCC patients. The mycoplasmal membrane protein p37 showed significant correlations with higher histologic stages and vascular invasion and predicted poor disease-free survival of HCC patients. p37-positive CTCs were detected in 42 out of 47 HCC patients (89%). p37-positive circulating cells were also detected in 4 out of 10 healthy donors (40%), and all were epithelial cell adhesion molecule (EpCAM)-positive. In HCC patients, most of p37-negative CTCs (95%) showed intermediate phenotype with neither EpCAM nor vimentin expression, but p37-positive CTCs were EpCAM-positive (44%), vimentin-positive (32%), and both negative (24%), suggesting that EpCAM-positive CTCs are enriched with mycoplasma infection. Mycoplasma infection promoted migratory capacity of HCC cells with increased expression of EpCAM. Immunoprecipitation analysis revealed that p37 associates with EpCAM. The results suggest that mycoplasma infection promotes tumor progression in HCC patients via interaction of the mycoplasmal p37 and EpCAM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mycoplasmal protein p37 associates with poor disease-free survival in HCC patients. </LI> <LI> p37-positive CTCs show EpCAM- or vimentin-positive phenotype. </LI> <LI> Mycoplasma infection promotes HCC cell migration with increased expression of EpCAM. </LI> <LI> p37 physically interacts with EpCAM. </LI> <LI> Mycoplasma infection promotes HCC progression via interaction of p37 and EpCAM. </LI> </UL> </P>
Kim, Soo Min,Cho, Soo Young,Kim, Min Woong,Roh, Seung Ryul,Shin, Hee Sun,Suh, Young Ho,Geum, Dongho,Lee, Myung Ae Korean Society for Molecular and Cellular Biology 2020 Molecules and cells Vol.43 No.6
Nuclear receptor-related 1 (Nurr1) protein has been identified as an obligatory transcription factor in midbrain dopaminergic neurogenesis, but the global set of human NURR1 target genes remains unexplored. Here, we identified direct gene targets of NURR1 by analyzing genome-wide differential expression of NURR1 together with NURR1 consensus sites in three human neural stem cell (hNSC) lines. Microarray data were validated by quantitative PCR in hNSCs and mouse embryonic brains and through comparison to published human data, including genome-wide association study hits and the BioGPS gene expression atlas. Our analysis identified ~40 NURR1 direct target genes, many of them involved in essential protein modules such as synapse formation, neuronal cell migration during brain development, and cell cycle progression and DNA replication. Specifically, expression of genes related to synapse formation and neuronal cell migration correlated tightly with NURR1 expression, whereas cell cycle progression correlated negatively with it, precisely recapitulating midbrain dopaminergic development. Overall, this systematic examination of NURR1-controlled regulatory networks provides important insights into this protein's biological functions in dopamine-based neurogenesis.
Photoionization of N,N,N',N'-Tetramethyl-p-phenylenediamine in Polar Solvents
Min Yeong Lee,Du Jeon Jang,Minyung Lee,Du-Jeon Jang,Dongho Kim,Sun Sook Lee,Bong Hyun Boo Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.4
The photoinduced electron transfer reactions of N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) in various polar solvents were studied by measuring time-resolved fluorescence. The temperature dependence on the fluorescence decay rate in acetonitrile, methanol, ethanol and buthanol was carried out to obtain the activation energy and Arrehnius factor for the photoinduced electron transfer reaction. It was found that as the dielectric constant of the solvent increases, the activation energy and the reaction rate increase. This implys that the Arrehnius factor is important in controlling the photoinduced electron transfer reaction rate. In water, TMPD exists in three forms (cationic, protonated and neutral forms) due to the high dielectric constant and strong proton donating power of water. The photoinduced electron transfer reaction was found to be very fast (< 50 ps) and also the long liverd component in the fluorescence decay profile attributable to the photoexcited protonated form of TMPD was observed. Probably, the reaction pathway and the reaction coordinate seem to be different depending on the solvents studied here.
Fully Printed Chipless RFID Tags Using Dipole Array Structures with Enhanced Reading Ranges
Dongho Jeon,Min-Sik Kim,Seung-Jin Ryu,Dae-Heon Lee,Jong-Kyu Kim 한국전자파학회JEES 2017 Journal of Electromagnetic Engineering and Science Vol.17 No.3
This article proposes a design of chipless RFID tag with dipole array structure that is fully printable using conductive ink. The proposed tags encode data based on spectral signature modulations. The reading range is considerably increased (2 m) while maintaining low transmission power (1 mW). Several prototype chipless RFID tags were fabricated and measured in the SHF and UHF bands. The proposed dipole array structure enhances the antenna gain of the passive tags and contributes to overcoming the low conductivity of conductive ink. In order to verify the utility of our proposal, the tags are manufactured on paper, using conductive ink, for the purpose of economic mass production.
Role of Lymphatic Embolization in Chylothorax Associated with Gorham–Stout Disease: A Case Report
Min-Hyuk Yu,Dongho Hyun,Sun-Hye Shin,Sang-Yun Ha 대한영상의학회 2024 대한영상의학회지 Vol.85 No.2
A 45-year-old male patient with spontaneous chylothorax and osteolysis in the right 1st and 2nd ribs was diagnosed with Gorham–Stout disease based on clinical manifestations and bone biopsy. The chylothorax temporarily decreased after a successful selective lymphatic embolization. The patient presented with recurrent chylothorax, mild chest discomfort, and progressive osteolysis (despite administering sirolimus) during the follow-up period of 15 months.