### Invited Lecture

High-order methods for partial differential equations, A 3-days Short Course at National Taiwan University, Taipei, Taiwan, Aug 19 & Aug 24-25, 2015.### Conferences/Seminars

### 2016

Speaker (invited), "Scalable High-Order Algorithms for Large-Scale Electromagnetic Systems," SIAM Annual Meeting, Boston, MA, July 11-16, 2016.Speaker (invited), "Scalable Spectral Element Discretizations for Transport Simulations," Mini-symposium on High-Order Numerical Methods for solving PDE with Discontinuous Solutions and Its Applications, Rio de Janeiro, Brazil, June 27-July 1, 2016.

Speaker (invited), "Scalable High-Order Simulations for Transport Equations," The Mathematics of Finite Elements and Applications (MAFELAP) Conference, Brunel University, Uxbridge, UK, June 14-17, 2016.

### 2015

Speaker (invited), "Scaling limits for transport simulations based on high-order spectral element discretizations," 2015, The 2nd International Conference in Applied Mathematics and Scientific Computing, Ocean University of China, Qingdao, China, Aug 16-18, 2015.Speaker (invited), "Highly tuned hybrid MPI/OpenACC implementation with GPUDirect communication for electromagnetic and uid solvers based on high order spectral element discretization," ICIAM, Beijing, China, Aug 14, 2015.

Speaker (invited), "High-order methods for high-performance simulations", ICIAM, Beijing, China, Aug 13, 2015.

Speaker (invited), "Scalable algorithms for large scale quantum-mechanical density matrix calculations for a nanopar- ticle system interacting with multi-state multiple quantum dots," ICIAM, Beijing, China, Aug 11, 2015.

Speaker (invitation only), "Highly Tuned MPI/OpenACC Implementation and Performance Analysis," Nek5000 Users' Meeting, Argonne, July 14, 2015.

Speaker (invited), "Hybrid MPI/OpenACC implimentation for a high-order electromagnetics solver on GPUDirect communication," Porting Apps to Titan: Results from the Inaugural GPU Hackathon at GPU Technology Conference, Silicon Valley, CA, Mar 17-20, 2015.

Speaker (invited), Highly tuned hybrid MPI/OpenACC implementation with GPUDirect communication for electromagnetics solvers based on spectral element discretizations, SIAM CSE, Utah, Mar 14, 2015.

### 2014

Speaker, "NekCEM: Recent developments for electromagnetic systems including driftdiffusion and quantum models," Nek5000 Users' Meeting, Thessaloniki, Greece, Aug 21, 2014.Speaker (invited), "Hydraulic modeling for quantum absorption calculation in plasmonics based on high-order spectral element discontinuous Galerkin approach," SIAM Annual Meeting, Jul 9, 2014.

Speaker (invited), "Extreme-scale electromagnetic modeling with nano-science applications," LDRD SI mid-term CNM presentation, ANL, Feb 12, 2014.

### 2013

Speaker (invited), "Scalable high-order algorithms and simulations for electromagnetics and fluids," Colloquium at Department of Mathematics, Iowa State University, Ames, IW, November 19, 2013.Speaker (invited), "High-order algorithms and performance for PDEs in electromagnetics and fluids," Scientific Computing Group Seminar, Brown University, Providence, RI, October 25, 2013.

Speaker (invited), "Exponential time integration methods for wave-dominated problems," International Conference: AMMCS- 2013, Waterloo, Ontario, Canada, August 26–30, 2013.

Poster, "Scalable high-order algorithms for energy applications," DOE Applied Math PI Meeting, Albuquerque, NM, August 6–8, 2013.

Speaker (invited), "High-order DG Methods: Scalable Algorithms and Performance for Electromagnetics Applications," FEMTEC 2013 The 4th International Congress on Computational Engineering and Sciences, Las Vegas, May 19 - 24, 2013.

Organizing Chair, A mini-symposium, "Advanced Algorithms for Scientific Applications," SIAM Conference on Computational Science and Engineering, Boston, MA, Feb 25-Mar 1. 2013.

Speaker (invited), "Scalable electromagnetic solver for applications in nanoscale materials," SIAM Conference on Computational Science and Engineering, Boston, MA, Feb 25–Mar 1. 2013.

Speaker (invited), "Parallel I/O optimizations for a massively parallel electromagnetic system," SIAM Conference on Computational Science and Engineering, Boston, MA, Feb 25–Mar 1. 2013.

Speaker (invited), "Scalable Algorithms Toward Exascale Computing for Energy Applications," Seminar at the Center for Computational & Applied Mathematics, Purdue University, Lafayette, IN, Feb 22, 2013.

### 2012

Speaker, "Recent development on NekCEM/NekLBM codes for electromagnetics and fluids," The 2nd Nek5000 Usermeeting, Zurich, Switzerland, Dec 8-9, 2012.Poster(invited), "Extreme-Scale Modeling for Transport Simulations," University of Chicago CELS Review: Extreme-scale modeling for transport simulations, Argonne, September 19, 2012.

Speaker, "Hybrid programming and performance for beam propagation modeling," The 11th International Computatinal Accelerator Physcis Conference (ICAP12), Rostock-Warnemünde, Germany, Aug 19-24, 2012.

Organizer, A mini-symposium, "Massively Parallel, Scalable Algorithms and Softwares for Scientific Applications," SIAM Conference on Parallel Processing for Scientific Computing, Savannah, GA, Feb 15-17, 2012.

Co-author (J. Fu, M. Min, R. Latham, C. Carothers), "Threading I/O strategy for checkpoint/restart of a massively parallel electromagnetic system," SIAM Parallel Processing 2012, Feb. 15–17, Savannah, GA, 2012.

### 2011

Poster, "Scaling PDE solvers to exascale," at DOE Applied Math PI Meeting, Washington DC, Oct 17–19, 2011.Poster, "High-performance algorithms for wakefield calculations,” Particle Accelerator Conference (PAC2011)," New York City, Mar 28–Apr 1, 2011.

Poster, "Programming software for electromagnetics," Particle Accelerator Conference (PAC2011), New York, March 28–April 1, 2011.

Speaker (invited), "High-performance high-order algorithms for scientific applications in electromagnetics and fluids," Seminar at the Department of Mechanical Engineering, The City University of New York, New York City, March 31, 2011.

Speaker, "High-performance high-order algorithms for electromagnetics and fluids,” Meeting with UIC SIAM students, Argonne National Laboratory, Argonne, IL, March 14, 2011.

Organizer, Minisymposium on Large-Scale Computing for Scientific Applications, SIAM Conference on Computational Science and Engineering, Reno, Nevada, Feb. 28–March 4, 2011.

Speaker (invited), "Performance analysis on the IBM BG/P for high-order electromagnetic modeling," at Minisymposium on Large-Scale Computing for Scientific Applications, SIAM Conference on Computational Science and Engineering, Reno, Nevada, Feb. 28–March 4, 2011.

Co-author (T. Lee and M. Min), "Parallel Performance of Spectral-Element Discontinuous Galerkin Lattice Boltzmann Method (SEDG-LBM) for Flow Simulations on BG/P," 2011 SIAM Conference on Computational Science and Engineering, Feb. 29-Mar. 4, Reno, NV, 2011.

### 2010

Speaker (invited), "Towards extreme-scale: high-order algorithms for electromagnetic and fluid modeling," Advanced Scientific Computing Advisory Committee (ASCAC) meeting, MCS/ANL, Nov. 10, 2010.Speaker (invited), "High-performance high-order electromagnetic modeling," Special Session on Computational electromagnetic and Acoustics at the AMS Central Sectional Meeting, University of Notre Dame, Notre Dame, IN, Nov. 5–7, 2010.

Speaker, "NekCEM: Performance and scalability for electromagnetic modeling," The first Nek5000 Users’ Meeting, Argonne National Laboratory, Dec. 10, 2010.

Co-author, (K.C. Uga, M. Min, T. Lee, and P.F. Fischer), "Lattice Boltzmann Simulations of Flow Past Two Cylinders in Tandem using Spectral-Element Discontinuous Galerkin Approach with Exponential Time Integrator," The 7th International Conference for Mesoscopic Methods in Engineering and Science (ICMMES), Edmonton, Canada, Jul. 12-16,2010.

Co-author (T. Lee and M. Min), "Spectral Element Discontinuous Galerkin Lattice Boltzmann Method for Incompressible Flows," The 19th Discrete Simulation of Fluid Dynamics (DSFD): Micro, Nano and Multiscale Physics for Emerging Technologies, Rome, Italy, Jul. 5-9, 2010.

Poster, "Efficient high-order algorithms for nanoscience simulations," DOE Applied Mathematics Research Program PI Meeting, Poster Session, Berkeley, CA, May 3–5, 2010.

Poster, "Scalable high-order algorithms for wakefield simulations," The 1st International Particle Accelerator Conference (IPAC), Poster session, Kyoto, Japan, May 23–28, 2010.

### 2009

Speaker (invited), "High-ordermethodsinspaceandtimefortime-dependentelectromagneticproblems," ComputationalScience and Engineering Mini-Workshop, Yonsei University, Seoul, Korea, Dec. 18, 2009.Speaker (invited), "Large scale simulations based on spectral-element discontinuous Galerkin methods: Nanoscience and accelerator applications," The First Joint Meeting of KMS and AMS, Computational Science and Engineering Session, Seoul, Korea, Dec. 16–20, 2009.

Co-author (K.C. Uga, M. Min, T. Lee, and P.F. Fischer), "Exponential Time Integrator for Solving the Lattice Boltzmann Equation based on a Spectral-Element Discontinuous Galerkin Approach," The 62nd Annual Meeting of the American Physical Society/Division of Fluid Dynamics, Minneapolis, MN, U.S.A., Nov. 22-24, 2009.

Poster, "Spectral element discontinuous Galerkin simulations with moving window for wakefield calculations," International Computational Accelerator Physics (ICAP) Conference, San Francisco, CA, Aug. 31 - Sept. 4, 2009.

Speaker (invited), "High-Performance Electromagnetic Modeling: Scientific applications in nanoscience and accelerator physics," at Mathematics Symposium for UKC Conference 2009, Raleigh, NC, July 16–19, 2009.

Co-author (T. Lee and M. Min), "Spectral Element Discontinuous Galerkin Lattice Boltzmann Method," The 5th MIT Conference on Computational Fluid and Solid Mechanics, Boston, MA, U.S.A., Jun. 17–19, 2009.

Poster (invited), "Large-scale electromagnetic modeling based on high-order methods: Nanoscience applications," SciDAC Conference 2009, Poster Session, San Diego, CA, Jun. 15–18, 2009.

Organizing Chair, a Minisymposium for ICOSAHOM 2009, Computational Electromagnetics: Theory and Applications for High Order Methods, Trondheim, Norway, June 22–26, 2009.

Speaker (invited), Light transmission calculations for nano arrays: spectral element discontinuous Galerkin method," at a Minisymposium for ICOSAHOM 2009, Computational Electromagnetics: Theory and Applications for High Order Methods, Trondheim, Norway, June 22–26, 2009.

Poster, "Spectral element discontinuous Galerkin simulations with moving window," The 23rd Particle Accelerator Conference (PAC), Poster Session, Vancouver, Canada, May 4–8, 2009.

Speaker (invited), "NekCEM: High-performance electromagnetic simulations," Mathematics and Its Applications Seminar at University of Illinois at Chicago, Feb. 25, 2009.

Speaker (invited), "High-performance electromagnetic modeling," Applied and Computational Math Seminar at U. North Car- olina at Charlotte, Charlotte, NC, Jan. 28, 2009.

### 2008

Speaker (invited), "Transport simulations with spectral element discontinuous Galerkin methods," Minisymposium of SIAM Annual Meeting, Advances in Numerical Methods for PDEs and Their Applications - Part I of II, San Diego, CA, July 7–11, 2008.### 2007

Organizing Chair, Minisymposium for The International Conference On Spectral and High Order Methods (ICOSAHOM), Beijing, China, Jun. 18–22, 2007.Speaker (invited), "Fourier spectral simulations for beam dynamics in accelerating structures," Minisymposium for The International Conference On Spectral and High Order Methods (ICOSAHOM), Beijing, China, Jun. 18–22, 2007.

Poster, "Computational nanophotonics: NekCEM, Office of Advanced Scientific Computing Research," Applied Mathematics Research Program Annual PI Meeting Poster Session, Livermore, CA, May 22–24, 2007

Speaker (Invited), "High-order simulations for wakefield calculations," Advanced Photon Source Division, Argonne National Laboratory, Jan. 22, 2007.

Poster (invited), "Computational nanophotonics," Science Careers in Search of Women Conference, Poster Session, Argonne National Laboratory, March 8, 2007.

Poster, "Wake fields for TESLA cavity structures: Spectral element discontinuous Galerkin simulations,” RF Superconductivity (SRF07), Poster Session, Beijing, China, Oct. 14–19, 2007.

Speaker, "Accelerator Modeling," LANS Seminar, Mathematics and Computer Science, Argonne, Aug. 29, 2007.

Poster, "Spectral-element discontinuous Galerkin simulations for bunched beam in accelerating structures," The 22nd Particle Accelerator Conference (PAC), Poster Session, Albuquerque, NM, June 25–29, 2007.

Poster, "Fourier spectral simulations for wake field in conducting cavities," The 22nd Particle Accelerator Conference (PAC), Poster Session, Albuquerque, NM, June 25–29, 2007.

### 2006

Speaker, "Spectral element discontinuous Galerkin simulations for waveguiding structures," PIERS 2006 in Tokyo Progress in Electromagnetics Research Symposium, Tokyo, Japan, Aug. 2–5, 2006.Speaker, "Exponential integrator based on a Krylov projection method," LANS Seminar, Mathematics and Computer Science Division, Argonne National Laboratory, June 13, 2006.

Speaker, "Spectral element discontinuous Galerkin simulations for metallic nanoparticles," PIERS 2006 in Cambridge - Progress in Electromagnetics Research Symposium, Cambridge, MA, March 26–29, 2006.

Speaker (invited), "Spectral element discontinuous Galerkin simulations for photonic crystals," Photonic Band Gap Material and Devices II (OE12) as a part of SPIE’s International Symposium on Integrated Optoelectronic Devices at San Jose, CA, Jan. 22–26, 2006.

### 2005

Speaker, "High-order methods for nanophotonics and photonic crystals," Mathematics and Computer Science Division, Argonne National Laboratory, Oct. 14, 2005.Speaker (invited), "Discontinuous Galerkin method based on quadrilateral mesh for Maxwell’s equations," The ACES/IEEE International Conference on Wireless Communications and Applied Computational Electromagnetics, Honolulu, HI, April 4–7, 2005.

### 2004

Speaker (invited), "Spectral methods for electromagnetic waves in discontinuous media," The 6th International Conference on Spectral and High-Order Methods (ICOSAHOM), Recent Advances in Spectral Methods and High Order Finite Difference Schemes, Brown University, RI, June 21–25, 2004.Speaker (invited), "Spectral methods for 2D photonic band structures," Photonic Band gap Materials and Devices II (OE12) as a part of SPIE’s International Symposium on Integrated Optoelectronic Devices at San Jose, CA, Jan. 26–29, 2004.

### 2003

Speaker (invited), "Spectral methods for discontinuous problems," Mathematics and Computer Science Division, Argonne National Laboratory, Nov. 2003.Speaker (invited), "Spectral methods for discontinuous problems," Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oct. 2003.

Speaker (invited), "Spectral methods for discontinuous problems," Colloquium, Department of Mathematics, University of Central Florida, FL, March 2003.