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Search Results: 1 - 10 of 26635 matches for " Myoung-Jae Lee "
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Surface Wave Echo in a Semi-Bounded Plasma  [PDF]
Hee J. Lee, Myoung-Jae Lee
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.712127
Abstract: Plasma echo theory is revisited to apply it to a semi-bounded plasma. Spatial echoes associated with plasma surface wave propagating in a semi-bounded plasma are investigated by calculating the second order electric field produced by external charges and satisfying the boundary conditions at the interface. The boundary conditions are two-fold: the specular reflection condition and the electric boundary condition. The echo spots are determined in terms of the perpendicular coordinate to the interface and the parallel coordinate along which the wave propagates. This improves the earlier works in which only the perpendicular coordinate is determined. In contrast with the echo in an infinite medium, echoes in a bounded plasma can occur at various spots. The diversity of echo occurrence spots is due to the discontinuity of the electric field at the interface that satisfies the specular reflection boundary condition. Physically, the diversity appears to be owing to the reflections of the waves from the interface.
Long-term variations in water quality in the lower Han River
Myoung-Sun Shin,Jae-Yong Lee,Bomchul Kim,Yeon Jae Bae
Journal of Ecology and Field Biology , 2011,
Abstract: The Han River is the main water resource for the Seoul metropolitan area (Korea) with twenty million people relyingon it, and its eutrophication is of great concern for preserving drinking water quality. In this study, long-term trendsin biological oxygen demand (BOD), chemical oxygen demand (COD), total phosphorus (TP), total nitrogen (TN), andsuspended solids at a downstream site of the river (St. Gui) are presented from 1989 to 2006 using data from the Ministryof the Environment. Longitudinal distributions in TP, TN, and chlorophyll-a concentration were measured in thedownstream reaches between the Paldang Dam and Haengju Bridge. The long-term average BOD was 1.82 ± 0.67 mg/Land showed a decreasing trend, whereas COD did not vary consistently with a long-term average of 3.46 ± 0.87 mg/L,and consequently, the BOD/COD ratio decreased. This pattern can be interpreted as an increasing trend in the nonbiodegradableorganic matter/biodegradable organic matter ratio, which can be attributed to enhanced sewage treatment.The long-term record for concentration did not show a consistent delate trend, whereas the seasonal variationwas remarkably large with high concentrations during the flood season. In contrast, phytoplankton density was higherduring low-flow seasons. It seemed that hydraulic residence time was the major factor controlling phytoplankton, as istypical in a lotic environment, which overwhelmed the effects of other factors such as temperature, nutrients, and solarradiation. In conclusion, BOD has decreased in the lower Han River system, but nonbiodegradable organic matter andphosphorus concentrations have not decreased.
Stochastic Processes and the Dirac Equation with External Fields
Jae-weon Lee,Eok Kyun Lee,Hae Myoung Kwon,In-gyu Koh,Yeong Deok Han
Physics , 2002,
Abstract: The equation describing the stochastic motion of a classical particle in 1+1-dimensional space-time is connected to the Dirac equation with external gauge fields. The effects of assigning different turning probabilities to the forward and the backward moving particles in time are discussed.
Intracranial hemorrhage and cerebellar infarction caused by acupuncture
Heo Jae-Hyeok,Bae Myoung-Hoon,Lee Su-Ji
Neurology India , 2011,
Ileal angiomyolipoma manifested by small intestinal Intussusception
Chang Ho Lee, Jong Hun Kim, Doo Hyun Yang, Yong Hwang, Myoung Jae Kang, Young Kon Kim, Min Ro Lee
World Journal of Gastroenterology , 2009,
Abstract: Angiomyolipomas (AMLs), a form of benign mesenchymal hamartoma, arise primarily in the kidneys of patients with or without tuberous sclerosis. Extra-renal AMLs are very rare and are most commonly found in the liver. AMLs of the small intestine are exceedingly rare. Here, a case of a 28-year-old man, who presented with ileal intussusception caused by ileal AML is reported. The clinicopathological and immunohistochemical findings of ileal AMLs are discussed and the literature on small intestinal AMLs is reviewed.
Pauli paramagnetism of an ideal Fermi gas
Ye-Ryoung Lee,Tout T. Wang,Timur M. Rvachov,Jae-Hoon Choi,Wolfgang Ketterle,Myoung-Sun Heo
Physics , 2013, DOI: 10.1103/PhysRevA.87.043629
Abstract: We show how to use trapped ultracold atoms to measure the magnetic susceptibility of a two-component Fermi gas. The method is illustrated for a non-interacting gas of $^6$Li, using the tunability of interactions around a wide Feshbach resonances. The susceptibility versus effective magnetic field is directly obtained from the inhomogeneous density profile of the trapped atomic cloud. The wings of the cloud realize the high field limit where the polarization approaches 100%, which is not accessible for an electron gas.
Tumor Infiltrating PD1-Positive Lymphocytes and the Expression of PD-L1 Predict Poor Prognosis of Soft Tissue Sarcomas
Jung Ryul Kim, Young Jae Moon, Keun Sang Kwon, Jun Sang Bae, Sajeev Wagle, Kyoung Min Kim, Ho Sung Park, Ho Lee, Woo Sung Moon, Myoung Ja Chung, Myoung Jae Kang, Kyu Yun Jang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0082870
Abstract: Recently, the possibility of PD1 pathway-targeted therapy has been extensively studied in various human malignant tumors. However, no previous study has investigated their potential application for soft-tissue sarcomas (STS). In this study, we evaluated the clinical impact of intra-tumoral infiltration of PD1-positive lymphocytes and PD-L1 expression in tumor cells in 105 cases of STS. Intra-tumoral infiltration of PD1-positive lymphocytes and PD-L1 expression were seen in 65% and 58% of STS, respectively. Both PD1-positivity and PD-L1 expression were significantly associated with advanced clinicopathological parameters such as higher clinical stage, presence of distant metastasis, higher histological grade, poor differentiation of tumor, and tumor necrosis. Moreover, both PD1-positivity and PD-L1 positivity were independent prognostic indicators of overall survival (OS) and event-free survival (EFS) of STS by multivariate analysis. In addition, the combined pattern of PD1- and PD-L1-positivity was also an independent prognostic indicator for OS and EFS by multivariate analysis. The patents with a PD1+/PD-L1+ pattern had the shortest survival time. In conclusion, this study is the first to demonstrate that the infiltration of PD1 positive lymphocytes and PD-L1 expression in STS cells could be used as novel prognostic indicators for STS. Moreover, the evaluation of PD1- and PD-L1-positivity in STS is also available as possible criteria for selection of patients suitable for PD1-based immunotherapy.
Resonantly exited precession motion of three-dimensional vortex core in magnetic nanospheres
Sang-Koog Kim,Myoung-Woo Yoo,Jehyun Lee,Ha-Youn Lee,Jae-Hyeok Lee,Yuri Gaididei,Volodymyr P. Kravchuk,Denis D. Sheka
Physics , 2013,
Abstract: We found resonantly excited precession motions of a three-dimensional vortex core in soft magnetic nanospheres and controllable precession frequency with the sphere diameter 2R, as studied by micromagnetic numerical and analytical calculations. The precession angular frequency for an applied static field $H_{DC}$ is given as $\omega_{MV}= \gamma_{eff} H_{DC}$, where $\gamma_{eff} = \gamma $ is the effective gyromagnetic ratio in collective vortex dynamics, with the gyromagnetic ratio $\gamma$ and the average magnetization component $$ of the ground-state vortex in the core direction. Fitting to the micromagnetic simulation data for $$ yields a simple explicit form of $ = (73.6 \pm 3.4)(l_{ex}/2R)^{2.20 \pm 0.14}$, where $l_{ex}$ is the exchange length of a given material. This dynamic behavior might serve as a foundation for potential bio-applications of size-specific resonant excitation of magnetic vortex-state nanoparticles, for example, magnetic particle resonance imaging.
Hedgehog Signaling Regulates the Survival of Gastric Cancer Cells by Regulating the Expression of Bcl-2
Myoung-Eun Han,Young-Suk Lee,Sun-Yong Baek,Bong-Seon Kim,Jae-Bong Kim,Sae-Ock Oh
International Journal of Molecular Sciences , 2009, DOI: 10.3390/ijms10073033
Abstract: Gastric cancer is the second most common cause of cancer deaths worldwide. The underlying molecular mechanisms of its carcinogenesis are relatively poorly characterized. Hedgehog (Hh) signaling, which is critical for development of various organs including the gastrointestinal tract, has been associated with gastric cancer. The present study was undertaken to reveal the underlying mechanism by which Hh signaling controls gastric cancer cell proliferation. Treatment of gastric cancer cells with cyclopamine, a specific inhibitor of Hh signaling pathway, reduced proliferation and induced apoptosis of gastric cancer cells. Cyclopamine treatment induced cytochrome c release from mitochondria and cleavage of caspase 9. Moreover, Bcl-2 expression was significantly reduced by cyclopamine treatment. These results suggest that Hh signaling regulates the survival of gastric cancer cells by regulating the expression of Bcl-2.
Compressibility of an Ultracold Fermi Gas with Repulsive Interactions
Ye-Ryoung Lee,Myoung-Sun Heo,Jae-Hoon Choi,Tout T. Wang,Caleb A. Christensen,Timur M. Rvachov,Wolfgang Ketterle
Physics , 2012, DOI: 10.1103/PhysRevA.85.063615
Abstract: Fermi gases with repulsive interactions are characterized by measuring their compressibility as a function of interaction strength. The compressibility is obtained from in-trap density distributions monitored by phase contrast imaging. For interaction parameters k_F a > 0.25 fast decay of the gas prevents the observation of equilibrium profiles. For smaller interaction parameters, the results are adequately described by first-order perturbation theory. A novel phase contrast imaging method compensates for dispersive distortions of the images.
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