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| 1 | Efficient Simulation of Wave Propagation with Implicit Finite Difference Schemes显示文摘Finite difference method is an important methodology in the approximation of waves.In this paper,we will study two implicit finite difference schemes for the simulation of waves.They are the weighted alternating direction implicit(ADI)scheme and the locally one-dimensional(LOD)scheme.The approximation errors,stability conditions,and dispersion relations for both schemes are investigated.Our analysis shows that the LOD implicit scheme has less dispersion error than that of the ADI scheme.Moreover,the unconditional stability for both schemes with arbitrary spatial accuracy is established for the first time.In order to improve computational efficiency,numerical algorithms based on message passing interface(MPI)are implemented.Numerical examples of wave propagation in a three-layer model and a standard complex model are presented.Our analysis and comparisons show that both ADI and LOD schemes are able to efficiently and accurately simulate wave propagation in complex media. | Wensheng Zhang Li Tong Eric T.Chung | 2012 | Numerical Mathematics(Theory,Methods and Applications)2012，5，2： | 2 |
| 2 | Hepatitis B screening, prophylaxis and re‐activation in the era of rituximab‐based chemotherapy显示文摘 | JorgeMéndez‐Navarro Kathleen E.Corey HuiZheng Lydia L.Barlow Jae YoungJang WenyuLin HongZhao Run‐XuanShao Steven L.McAfee Raymond T.Chung | 2011 | Liver International2011，，3： | 2 |
| 3 | 查看详情显示文摘 | M.H.Han S.Lee N.J.Kim K.J.Lee T.Chung G.Byun | | 0，，： | 1 |
| 4 | Homogenization with the Quasistatic Tresca Friction Law:Qualitative and Quantitative Results显示文摘Modeling of frictional contacts is crucial for investigating mechanical performances of composite materials under varying service environments.The paper considers a linear elasticity system with strongly heterogeneous coefficients and quasistatic Tresca friction law,and studies the homogenization theories under the frameworks of H-convergence and small ε-periodicity.The qualitative result is based on H-convergence,which shows the original oscillating solutions will converge weakly to the homogenized solution,while the author’s quantitative result provides an estimate of asymptotic errors in H^(1)-norm for the periodic homogenization.This paper also designs several numerical experiments to validate the convergence rates in the quantitative analysis. | Changqing YE Eric T.CHUNG Jun-zhi CUI | 2023 | Chinese Annals of Mathematics,Series B2023，44，5： | 0 |
| 5 | Identification of the 2l2l′nl ″^(2)P^(0) Hollow Lithium Systems显示文摘In a recent letter[L.Journel et al.,Phys.Rev.Lett.76,30(1996)],first experimental determination of the partial photoionization cross sections of lithium near the hollow atomic states was reported.Very extensive R-matrix calculation has also been carried out for the 2l2l′nl ″^(2)P^(0) hollow states and assignments for the excited states have been made.However,these assignments are substantially different from those of other theoretical methods.This points out the need for more information and discussion which are necessary for a meaningful comparison. | Kwong T.Chung 苟秉聪 | 1998 | Chinese Physics Letters1998，15，5： | 0 |
| 6 | A TV-Based Iterative Regularization Method for the Solutions of Thermal Convection Problems显示文摘Linear/nonlinear and Stokes based-stabilizations for the filter equations for damping out primitive variable(PV)solutions corrupted by uniformly distributed randomnoises are numerically studied through the natural convection(NC)aswell as the mixed convection(MC)environment.The most recognizable filter-scheme is based on a combination of the negative Laplace equation multiplied with the selection of the spatial scale and a linear function in order to preserve the uniqueness of the filtered solution.A more complicated filter-scheme,based on a Stokes problem which couples a filtered velocity and a filtered(artificial)pressure(or Lagrange multiplier)in order to enforce the incompressibility constraint,is also studied.Linear and Stokes basedfilters via nested iterative(NI)filters and the consistent splitting scheme(CSS)are proposed for the NC/MC problems.Inspired by the total-variation(TV)model of image diffusion,well preserved feature flow patterns from the corrupted NC/MC environment are obtained by TV-Stokes based-filters together with the CSS.Our experimental results show that our proposed algorithms are effective and efficient in eliminating the unwanted spurious oscillations and preserving the accuracy of thermal convective fluid flows. | Eric T.Chung Jeff C.-F.Wong | 2013 | Communications in Computational Physics2013，14，9： | 0 |
| 7 | ENERGIES AND WIDTHS OF HIGH TRIPLY EXCITED STATES OF LITHIUM显示文摘Theadvancesofthesynchrotronradiationandcomputertechnologyhaverevivedtheconsiderableexperimentalandtheoreticalinterestsinthest... | Gou Bingcong Deng WenshengBeijing Institute of Technology Beijing 100081Kwong T.ChungDepartment of Physics, North Carolina State University, Raleigh, NC27695, USA | 1998 | 原子与分子物理学报1998，15，S1： | 0 |
| 8 | A Sub-Grid Structure Enhanced Discontinuous Galerkin Method for Multiscale Diffusion and Convection-Diffusion Problems显示文摘In this paper,we present an efficient computational methodology for diffusion and convection-diffusion problems in highly heterogeneous media as well as convection-dominated diffusion problem.It is well known that the numerical computation for these problems requires a significant amount of computermemory and time.Nevertheless,the solutions to these problems typically contain a coarse component,which is usually the quantity of interest and can be represented with a small number of degrees of freedom.There are many methods that aim at the computation of the coarse component without resolving the full details of the solution.Our proposed method falls into the framework of interior penalty discontinuous Galerkin method,which is proved to be an effective and accurate class of methods for numerical solutions of partial differential equations.A distinctive feature of our method is that the solution space contains two components,namely a coarse space that gives a polynomial approximation to the coarse component in the traditional way and a multiscale space which contains sub-grid structures of the solution and is essential to the computation of the coarse component.In addition,stability of the method is proved.The numerical results indicate that the method can accurately capture the coarse behavior of the solution for problems in highly heterogeneous media as well as boundary and internal layers for convection-dominated problems. | Eric T.Chung Wing Tat Leung | 2013 | Communications in Computational Physics2013，14，7： | 0 |
| 9 | 编者的话显示文摘 | 叶定伟 Hans T.Chung | 2007 | 中国癌症杂志2007，17，3： | 0 |
| 10 | On the ls^(2)4d Fine Structures of BⅢand NeⅧ显示文摘The fine structure of lithium-like ls^(2)4d states in the literature behaves irregularly as a function of Z.The fine structures of the B III and Ne VIII fall well below the isoelectronic curve.The term energies of these two systems in the data tables also give worse agreement with the theoretical prediction.In this work,we show that the reason for this unusual situation is caused by a misidentification in the original spectra.When the correct identifications are made,the fine structures of both systems fall on the isoelectronic curve and the agreement between theory and experiment is excellent. | WANG Zhiwen Kwong T.Chung ZHU Xiaowei | 1995 | Chinese Physics Letters1995，12，1： | 0 |
| 11 | [^(18)F]MAGL-4-11 positron emission tomography molecular imaging of monoacylglycerol lipase changes in preclinical liver fibrosis models显示文摘Monoacylglycerol lipase(MAGL) is a pivotal enzyme in the endocannabinoid system, which metabolizes 2-arachidonoylglycerol(2-AG) into the proinflammatory eicosanoid precursor arachidonic acid(AA). MAGL and other endogenous cannabinoid(EC) degrading enzymes are involved in the fibrogenic signaling pathways that induce hepatic stellate cell(HSC) activation and ECM accumulation during chronic liver disease. Our group recently developed an;F-labeled MAGL inhibitor([18F]MAGL-4-11)for PET imaging and demonstrated highly specific binding in vitro and in vivo. In this study, we determined [18F]MAGL-4-11 PET enabled imaging MAGL levels in the bile duct ligation(BDL) and carbon tetrachloride(CCl_(4)) models of liver cirrhosis;we also assessed the hepatic gene expression of the enzymes involved with EC system including MAGL, NAPE-PLD, FAAH and DAGL that as a function of disease severity in these models;[18F]MAGL-4-11 autoradiography was performed to assess tracer binding in frozen liver sections both in animal and human. [18F]MAGL-4-11 demonstrated reduced PET signals in early stages of fibrosis and further significantly decreased with disease progression compared with control mice. We confirmed MAGL and FAAH expression decreases with fibrosisseverity, while its levels in normal liver tissue are high;in contrast, the EC synthetic enzymes NAPE-PLD and DAGL are enhanced in these different fibrosis models. In vitro autoradiography further supported that[18F]MAGL-4-11 bound specifically to MAGL in both animal and human fibrotic liver tissues. Our PET ligand [18F]MAGL-4-11 shows excellent sensitivity and specificity for MAGL visualization in vivo and accurately reflects the histological stages of liver fibrosis in preclinical models and human liver tissues. | Tuo Shao Zhen Chen Jian Rong Vasily Belov Jiahui Chen Andre Jeyarajan Xiaoyun Deng Hualong Fu Qingzhen Yu Steve H.Rwema Wenyu Lin Mikhail Papisov Lee Josephson Raymond T.Chung Steven H.Liang | 2022 | Acta Pharmaceutica Sinica B2022，12，1： | 0 |
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