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Alex Sim,SDD, Lawrence Berkeley National Laboratory
ASim@lbl.gov 510-600-3562 https://www.linkedin.com/in/alexsim/  

Posters and Invited Presentations
  1. P1. G. Eisenhauer, J. Gu, A. Huebl, S. Klasky, N. Podhorszki, A. Sim, J. Vay, K. Wu, "Stress-Testing Exascale Scientific Data Output: Benchmarking with WarpX under Extreme Load Imbalance", 38th International Conference on Scalable Scientific Data Management (SSDBM 2026), 2026.
  2. E. Wang, A. Sim, K. Wu, J. Balcas, B. White, C. Guok, I. Monga, D. Davila, F. Wurthwein, H. Newman, "Transfer Learning based Resource Usage Prediction in In-network Caching", 28th Conference on Computing in High Energy and Nuclear Physics (CHEP 2026), 2026.
  3. G. Kim, A. Sim, K. Wu, "Analyzing Dataset Popularity for Optimizing In-network Storage", ACM/IEEE The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC'25), ACM Student Research Competition (SRC), 2025.
  4. A. Sharma, A. Newkirk, A. Sim, Z. Zhao, W. Park, "Exploring Energy Efficiency in Scientific and Industrial AI Workloads", Open Compute Project (OCP) Global Summit, 2025.
  5. J. Gu, K. Wu, A. Huebl, J-L. Vay, A. Sim, N. Podhorszki, S. Klasky, "Addressing I/O Challenges in Time Frame Transformations: A Case Study of WarpX Simulations", International Conference on Scalable Scientific Data Management (SSDBM'25), 2025.
  6. E. Sohn, C. Kim, A. Sim, D. K. Sung, Y. Son, J. Park, S. Kim, "Toward Performance Prediction in Large- Scale Systems through Temporal System and Application Log Analysis", 39th IEEE International Parallel & Distributed Processing Symposium (IPDPS 2025), 2025.
  7. J. Chung, N. Monozon, V. Yakubovich, A. Sim, K. Wu, "Forecasting Regional Cache Utilization in Large-Scale Scientific Workflows", ICME Research Symposium, Stanford University, 2025. Won the Second place in Research Poster Competition.
  8. E. Wang, A. Sim, K. Wu, "Comparing Cache Utilization Trends for Regional Scientific Caches with Transfer Learning Models", ACM/IEEE The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC'24), ACM Student Research Competition (SRC), 2024. Won the Fourth place in ACM Student Research Competition (SRC).
  9. M. Sudarshan, A. Sim, K. Wu, "Predicting Dataset Popularity for Improved Distributed Content Caching in High Energy Physics", ACM/IEEE The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC'24), ACM Student Research Competition (SRC), 2024.
  10. J. Aldrich, A. Sim, K. Wu, S. Yoo, H. Ito, V. Garonne, E. Lancon, "Exploring Data Caching Policy with Data Access Patterns from dCache Logs", 27th International Conference on Computing in High Energy & Nuclear Physics (CHEP 2024), 2024.
  11. A. Sim, E. Wang, R. Monga, K. Wu, J. Balcas, C. Guok, I. Monga, D. Davila, F. Wurthwein, H. Newman, "Comparing Cache Utilization Trends for Regional Data Caches", 27th International Conference on Computing in High Energy & Nuclear Physics (CHEP 2024), 2024.
  12. R. Monga, A. Sim, J. Wu, "Comparative Study of the Cache Utilization Trends for Regional Scientific Data Caches", ACM Student Research Competition Grand Final, 2024.
  13. M. Sudarshan, A. Sim, K. Wu, "Data Source Pattern Studies for High Energy Physics Data Analysis", Data Science Discovery Cloud Computing Award, University of California at Berkeley, 12/2023.
  14. R. Monga, A. Sim, K. Wu, "Comparative Study of the Cache Utilization Trends for Regional Scientific Data Caches", ACM/IEEE The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC'23), ACM Student Research Competition (SRC), 2023. Won the First place in ACM Student Research Competition (SRC).
  15. J. W. Chung, A. Sim, B. Quiter, Y. Wu, W. Zhao, K. Wu, "Preparing Spectral Data for Machine Learning: A Study of Geological Classification from Aerial Surveys", Machine Learning and the Physical Sciences Workshop (ML4PS), in conjunction with the 37th Annual Conference on Neural Information Processing Systems (NeurIPS 2023), 2023.
  16. C. Guok, E. Kissel, A. Sim, "ESnet In-Network Caching Pilot", The Network Conference 2023 (TNC'23), 2023.
  17. C. Sim, K. Wu, A. Sim, I. Monga, C. Guok, F. Wurthwein, D. Davila, H. Newman, J. Balcas, "Predicting Resource Usage Trends with Southern California Petabyte Scale Cache", 26th International Conference on Computing in High Energy & Nuclear Physics (CHEP 2023), 2023.
  18. J. Bellavita, C. Sim, K. Wu, A. Sim, S. Yoo, H. Ito, V. Garonne, E. Lancon, "Understanding Data Access Patterns for dCache System", 26th International Conference on Computing in High Energy & Nuclear Physics (CHEP 2023), 2023.
  19. E. Kissel, A. Sim, C. Guok, "Experiences in deploying in-network data caches", 26th International Conference on Computing in High Energy & Nuclear Physics (CHEP 2023), 2023.
  20. H-C. Yang, L. Jin, A. Lazar, A. Todd-Blick, A. Sim, K. Wu, Q. Chen, C. A. Spurlock, "Gender Gaps in Mode Usage, Vehicle Ownership, and Spatial Mobility When Entering Parenthood: A Life Course Perspective", Transportation Research Board 102nd Annual Meeting, 2023.
  21. J. Bellavita, A. Sim, K. Wu, "Predicting Scientific Dataset Popularity Using dCache Logs", ACM/IEEE The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC’22), ACM Student Research Competition (SRC), 2022.
  22. C. Sim, C. Guok, A. Sim, K. Wu, "Data Throughput Performance Trends of Regional Scientific Data Cache", ACM/IEEE The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC'22), ACM Student Research Competition (SRC), 2022.
  23. A. Sim, "Data Access Trends in Southern California Petabyte Scale Cache", WLCG Data Organization, Management and Access (DOMA) general meeting, CERN, 2022.
  24. A. Pereira, A. Sim, K. Wu, S. Yoo, H. Ito, "Data access pattern analysis for dCache storage system", International Conference on High Performance Computing in Asia-Pacific Region (HPC Asia 2022), 2022.
  25. L. Jin, A. Lazar, C. Brown, Q. Chen, A. Sim, K. Wu, S. Ravulaparthy, V. Garikapati, C. A. Spurlock, "What Makes You Hold on to That Old Car? Joint Insights from Machine Learning and Multinomial Logit on Vehicle-level Transaction Decisions", Transportation Research Board 101st Annual Meeting, 2022.
  26. J. Cheung, A. Sim, J. Kim, K. Wu, "Performance Prediction of Large Data Transfers", ACM/IEEE The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC21), ACM Student Research Competition (SRC).
  27. E. Copps, A. Sim, K. Wu, "Analyzing scientific data sharing patterns with in-network data caching", ACM Richard Tapia Celebration of Diversity in Computing (TAPIA 2021), ACM Student Research Competition (SRC), 2021.
  28. A. Sim, "Exploring in-network data caching, ESnet-US CMS collaboration study", LHC GDB meeting at CERN, 2/10/2021, https://indico.cern.ch/event/876773/
  29. A. Sim, "Exploring in-network data caching, ESnet-US CMS collaboration study", US CMS Blueprint meeting, 2/23/2021, https://indico.cern.ch/event/925536/
  30. B. Weinger, A. Sim, K. Wu, J. Kim, "Enhancing IoT Anomaly Detection Performance for Federated Learning", International Conference for High Performance Computing, Networking, Storage, and Analysis (SC20), ACM Student Research Competition (SRC), 2020.
  31. B. Bard, C. Snavely, L. Gerhardt, J. Lee, B. Totzke, K. Antypas, S. Byna, R. Cheema, S. Cholia, M. Day, B, Enders, A, Gaur, A, Greiner, T. Groves, M. Kiran, Q. Koziol, K. Rowland, C, Samuel, A. Selvarajan, A. Sim, D. Skinner, R. Thomas, G. Torok, "The Superfacility project: automated pipelines for experiments and HPC", State of the Practice (SOP), International Conference for High Performance Computing, Networking, Storage, and Analysis (SC20), 2020.
  32. A. Sim, "Statistical Pattern Detection with Locally Exchangeable Measures", International Conference on Advanced Communications and Computation (INFOCOMP 2020), 2020.
  33. L. Jin, A. Lazar, J. Sears, A. Todd, A. Sim, K. Wu, C. A. Spurlock, Life Course as a Contextual System to Investigate the Effects of Life Events, Gender, and Generation on Travel Mode Use, Transportation Research Board (TRB) 99th Annual Meeting, 2020.
  34. B. Cetin, A. Lazar, J. Kim, A. Sim, K. Wu, "Federated Wireless Network Intrusion Detection", IEEE International Conference on Big Data (Big Data), 2019. doi:10.1109/BigData47090.2019.9005507
  35. L. Jin, A. Lazar, J. Sears, A. Todd, A. Sim, K. Wu, C. A. Spurlock, "Life course as a contextual system to investigate the effects of life events, gender and generation on travel mode usage", the Behavior, Energy & Climate Change Conference (BECC), 2019.
  36. J. Balcas, H. Newman, M. Spiropulu, X. Yang, T. Lehman, I. Monga, C. Guok, J. MacAuley, A. Sim, P. Demar, "SDN for End-to-End Networking at Exascale", the 24th International Conference on Computing in High Energy and Nuclear Physics (CHEP), 2019.
  37. A. Ballow, A. Lazar, A. Sim, K. Wu, "Handling Missing Values in Joint Sequence Analysis", 2019 ACM Richard Tapia Celebration of Diversity in Computing (TAPIA), 2019. Won the First place in ACM Student Research Competition (SRC).
  38. O. Del Guercio, R. Orozco, A. Sim, K. Wu, "Multidimensional Compression and Pattern Matching", Data Compression Conference (DCC 2019), 2019. doi:10.1109/DCC.2019.00079
  39. A. Ballow, A. Lazar, A. Sim, K. Wu, "Joint Sequence Analysis Challenges: How to Handle Missing Values and Mixed Variable Types", SIAM Conference on Computational Science and Engineering (CSE19), 2019
  40. T. Leibengood, A. Lazar, A. Sim, K. Wu, "Network Traffic Performance Prediction with Multivariate Clusters in Time Windows", SIAM Conference on Computational Science and Engineering (CSE19), 2019.
  41. A. Lazar, K. Wu, A. Sim, "Predicting Network Traffic Using TCP Anomalies", IEEE International Conference on Big Data (Big Data), 2018.
  42. K. Tu, A. Sim, K. Wu, "Identification of Network Data Transfer Bottlenecks in HPC Systems", International Conference for High Performance Computing, Networking, Storage and Analysis (SC'18), ACM Student Research Competition (SRC), 2018.
  43. J. Wang, A. Sim, K. Wu, S. Hwangbo, "Accurate Signal Timing from High Frequency Streaming Data", IEEE International Conference on Big Data (Big Data 2017), 2017.
  44. J. Wang, K. Wu, A. Sim, S. Hwangbo, "Feature Engineering and Classification Models for Partial Discharge Events in Power Transformers", 10th IEEE/ACM International Conference on Utility and Cloud Computing (UCC 2017), 2017.
  45. P. Harrington, W. Yoo, A. Sim, K. Wu, "Diagnosing Parallel I/O Bottlenecks in HPC Applications", International Conference for High Performance Computing, Networking, Storage and Analysis (SC'17), ACM Student Research Competition (SRC), 2017. Won the First place in ACM Student Research Competition (SRC).
  46. D. Lee, A. Sim, J. Choi, K. Wu, "Expanding Statistical Similarity Based Data Reduction to Capture Diverse Patterns", Data Compression Conference (DCC 2017), 2017.
  47. S. Fries, S. Ames, A. Sim, D. Williams, "HPSS Connections to ESGF: BASEJumper", Earth System Grid Federation (ESGF) Conference, 2016, 12/06/2016.
  48. J. Wang, W. Yoo, A. Sim, K. Wu, "Analysis of Variable Selection Methods on Scientific Cluster Measurement Data", International Conference for High Performance Computing, Networking, Storage and Analysis (SC'16), 2016. Won the Second place in ACM Student Research Competition (SRC).
  49. M. Bae, W. Yoo, A. Sim, K. Wu, "Discovering Energy Resource Usage Patterns on Scientific Clusters", International Conference for High Performance Computing, Networking, Storage and Analysis (SC'16), 2016. Won the Third place in ACM Student Research Competition (SRC).
  50. M. Bryson, S. Byna, A. Sim, K. Wu, "The Search for Missing Parallel IO Performance on the Cori Supercomputer", International Conference for High Performance Computing, Networking, Storage and Analysis (SC'16), ACM Student Research Competition (SRC), 2016. M.
  51. S. Fries, A. Sim, "HPSS connections to ESGF", Earth System Grid Federation Conference (ESGF 2015), 2015.
  52. M. Koo, W. Yoo, A. Sim, "I/O Performance Analysis Framework on Measurement Data from Scientific Clusters", ACM Student Research Poster Competition, Super Computing 2015, 2015.
  53. L. Wu, K. Wu, A. Sim, A. Stathopoulos, "Real-Time Outlier Detection Algorithm for Finding Blob-Filaments in Plasma", ACM Student Research Poster Competition, Super Computing 2014, 2014.
  54. A. Sim, "Network Traffic Prediction Model", NGNS PI meeting, 2014.
  55. A. Sim, "Exercising ICEE Framework with Fusion Blob Detection", NGNS PI meeting, 2014.
  56. D. Antoniades, K. Hu, A. Sim, C. Dovrolis, "What SNMP data can tell us about Edge-to-Edge network performance", Passive and Active Measurement Conference (PAM), 2013
  57. S. Hankin, et al., "The Live Access Server and the Ferret-THREDDS Data Server: The visualization and analysis engine behind the Earth System Grid Center for Enabling Technologies", World Climate Research Programme (WCRP) 2011, 10/2011.
  58. D. Williams, et al. "A data infrastructure for data-intensive climate research", WCRP 2011, 10/2011
  59. D. Hasenkamp, A. Sim, M. Wehner, K. Wu, "Finding Tropical Cyclones on Clouds", Super Computing (New Orleans, LA), 2010. Won Third place in ACM Student Research Poster Competition.
  60. A. Sim, A. Shoshani, "Storage Resource Management: Grid Technology for Dynamic Storage Allocation and Uniform Access", Open Source Grid and Cluster Conference, 2008
  61. A. Sim, "Storage Resource Management in the Grid Environment", Panelists: A. Sim, D. Petravick, R. Baker, R. Moore, M. Ernst. Computing in High Energy Physics (San Diego, CA), 2003
  62. A. Sim, "Globus in Earth Science Grid", the 9th IEEE International Symposium on High Performance Distributed Computing (Pittsburgh, PA), 2000

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