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

Conference papers
Journal articles and book chapters
Technical reports and others
Specifications and other contributions
Journal articles and book chapters
  1. D. Sung, S. Kim, S. Lee, H. Tang, A. Sim, K. Wu, S. Byna, Y. Son, "Regen: An Object Layout Regenerator on Large-Scale Production HPC Systems", Future Generation Computer Systems, Vol. 171, 2025. doi:10.1016/j.future.2025.107830.
  2. R. Frehner, K. Wu, A. Sim, J. Kim, K. Stockinger, "Detecting Anomalies in Time Series Using Kernel Density Approaches", IEEE Access, Vol. 12, pp. 33420-33439, 2024. doi:10.1109/ACCESS.2024.3371891.
  3. R. Shao, A. Sim, K. Wu, J. Kim, "Leveraging History to Predict Abnormal Transfers in Distributed Workflows", Sensors, 23(12), pp. 5485, MDPI, 2023. doi:10.3390/s23125485.
  4. 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", Systems, 11(6), pp. 314, MDPI, 2023. doi:10.3390/systems11060314.
  5. S. Kim, A. Sim, K. Wu, S. Byna, Y. Son, H. Eom, "Design and Implementation of I/O Performance Prediction Scheme on HPC Systems through Large-scale Log Analysis", Journal of Big Data, Vol. 10, Article 65, 2023. doi:10.1186/s40537-023-00741-4.
  6. J. Wang, K. Wu, A. Sim, S. Hwangbo, "Locating Partial Discharges in Power Transformers with Convolutional Iterative Filtering", Sensors, 2023, 23, doi: 10.3390/s23041789.
  7. J. Bang, A. Sim, G. Lockwood, H. Eom, H. Sung, "Design and Implementation of Burst Buffer Over-Subscription Scheme for HPC Storage Systems", IEEE Access, 2023, doi: 10.1109/ACCESS.2022.3233829.
  8. S. Kim, A. Sim, K. Wu, S. Byna, Y. Son, "esign and Implementation of Dynamic I/O Control Scheme for Large Scale Distributed File Systems", Cluster Computing, Springer, 2022. doi:10.1007/s10586-022-03640-0.
  9. B. Weinger, J. Kim, A. Sim, M. Nakashima, N. Moustafa, K. Wu, "Enhancing IoT Anomaly Detection Performance for Federated Learning", Digital Communications and Networks, Special Issue on Edge Computation and Intelligence, ISSN 2352-8648, 2022. doi:10.1016/j.dcan.2022.02.007. https://www.sciencedirect.com/science/article/pii/S2352864822000190.
  10. L. Jin, A. Lazar, C. Brown, V. Garikapati, B. Sun, S. Ravulaparthy, Q. Chen, A. Sim, K. Wu, T. Wenzel, T. Ho, C. A. Spurlock, ""hat Makes You Hold on to That Old Car? Joint Insights from Machine Learning and Multinomial Logit on Vehicle-level Transaction Decisions", Frontiers in Future Transportation, 3:894654, 2022. doi:10.3389/ffutr.2022.894654.
  11. A. Syal, A. Lazar, J. Kim, A. Sim, K. Wu, "Network traffic performance analysis from passive measurements using gradient boosting machine learning", International Journal of Big Data Intelligence, Vol. 8, No. 1, pp 13-30, ISSN: 2053-1389, eISSN: 2053-1397, 2021. doi:10.1504/IJBDI.2021.118741.
  12. M. Nakashima, A. Sim, Y. Kim, J. Kim, J. Kim, "Automated Variable Selection for Network Anomaly Detection", ACM Transactions on Management Information Systems (TMIS), Vol. 12, No. 3, pp 1-28, 2021. doi:10.1145/3446636.
  13. L. Jin, A. Lazar, J. Sears, A. Todd, A. Sim, K. Wu, H.-C. Yang, C. A. Spurlock,"Clustering Life Course to Understand the Heterogeneous Effects of Life Events, Gender and Generation on Habitual Travel Modes", EEE Access, 2020, 1-17, doi:10.1109/ACCESS.2020.3032328.
  14. I. Monga, C. Guok, J. MacAuley, A. Sim, H. Newman, J. Balcas, P. DeMar, L. Winkler, T. Lehman, X. Yang, "SDN for End-to-end Networked Science at the Exascale", Future Generation Computer Systems, Elsevier, 2020, doi:10.1016/j.future.2020.04.018.
  15. J. Kim, A. Sim, B. Tierney, S. Suh, I. Kim, "Multivariate Network Traffic Analysis using Clustered Patterns", Journal of Computing, Springer, Vol. 101, No. 4, pp. 339-361, April 2019. doi:10.1007/s00607-018-0619-4.
  16. J. Kim, A. Sim, "A New Approach to Online, Multivariate Network Traffic Analysis", Journal of Computer Science and Technology, Special Section on Computer Networks and Distributed Computing, Vol. 34, No. 2, pp. 388–402, 2019. doi:10.1007/s11390-019-1915-y
  17. A. Lazar, L. Jin, A. Spurlock, A. Todd, K. Wu, A. Sim, "Data Quality Challenges with Missing Values and Mixed Types in Joint Sequence Analysis", ACM Journal of Data and Information Quality (JDIQ), Vol. 11, No. 2, pp 1-22, 2019, doi:10.1145/3301294.
  18. H. Zhan, G. Gomes, X. S. Li, K. Madduri, A. Sim, K. Wu, "Consensus Ensemble System for Traffic Flow Prediction", IEEE Transactions on Intelligent Transportation Systems, 2018.
  19. T. Kim, D. Lee, J. Choi, A. Spurlock, A. Sim, A. Todd, K. Wu, "Predicting Baseline for Analysis of Electricity Pricing", International Journal of Big Data Intelligence, Special issue on Data to Decision. Vol.5, No.1/2, pp.3-20, 2018, doi:10.1504/IJBDI.2018.10008133.
  20. Lingfei Wu, Kesheng Wu, Alex Sim, Michael Churchill, Jong Choi, Andreas Stathopoulos, Choong-Seock Chang, Scott Klasky, "Towards Real-Time Detection and Tracking of Spatio-Temporal Features: Blob-Filaments in Fusion Plasma", IEEE Transactions on Big Data (TBD), Vol. 2, Issue 3, pp. 262-275, doi:10.1109/TBDATA.2016.2599929, Sep. 2016.
  21. W. Yoo, A. Sim, "Time-series Forecast Modeling on High-Bandwidth Wide Area Network Measurements", Journal of Grid Computing, Vol. 14, Issue 3, pp 463-476, doi:10.1007/s10723-016-9368-9, September 2016. http://link.springer.com/article/10.1007/s10723-016-9368-9.
  22. W. Yoo, M. Koo, Y. Cao, A. Sim, P. Nugent, K. Wu, "Performance Analysis Tool for HPC and Big Data Applications on Scientific Clusters", in Conquering Big Data Using High Performance Computing, edited by R. Arora, pp.139-161, Springer International Publishing, 2016, doi:10.1007/978-3-319-33742-5, ISBN 978-3-319-33742-5 (ebook), 978-3-319-33740-1 (hardcover), http://www.springer.com/us/book/9783319337401.
  23. David H. Bailey, Stephanie Ger, Marcos Lopez De Prado, Alexander Sim, Kesheng Wu, "Statistical Overfitting and Backtest Performance", book chapter, “Risk-Based and Factor Investing”, edited by Emmanuel Jurczenko, ISTE Press Ltd, Elsevier Ltd, UK, pp. 449-461, ISBN 978-1-78548-008-9, 2015.
  24. K. Hu, J. Choi, A. Sim, J. Jiang, "Best Predictive Generalized Linear Mixed Model with Predictive Lasso for High-Speed Network Data Analysis", International Journal of Statistics and Probability, Vol. 4, No. 2, p132-148, ISSN 1927-7032, 2015, doi:10.5539/ijsp.v4n2p132
  25. D.N. Williams, R. Ananthakrishnan, G. Aloisio, D. Bader, G. Bell, L. Cinquini, S. Denvil, C. Doutriaux, R. Drach, S. Fiore, I. Foster, E. Gonzalez, J. Harney, E. Marques, N. Miller, R. Schweitzer, G. Shipman, C. Silva, A. Sim, K. Taylor, "Climate Science Responds to Big Data Challenges: Accessing and Analyzing Model Output and Observations", 2012-13 Program on Statistical and Computational Methodology for Massive Datasets, and Bulletin of the American Meteorological Society, 2013
  26. D. N. Williams, A. Sim, et al., "Earth System Grid Federation: Infrastructure to Support Climate Science Analysis as an International Collaboration. A Data-Driven Activity for Extreme-Scale Climate Science", Data Intensive Science Series: Chapman & Hall/CRC Computational Science, ISBN 9781439881392, 2012.
  27. J. Gu, D. Katramatos, X. Liu, V. Natarajan, A. Shoshani, A. Sim, D. Yu, S. Bradley, S. McKee, "StorNet: Integrated Dynamic Storage and Network Resource Provisioning and Management for Automated Data Transfers", Journal of Physics: Conf. Ser. vol. 331, 2011, doi:10.1088/1742-6596/331/1/012002
  28. G Garzoglio, J Bester, K Chadwick, D Dykstra, D Groep, J Gu, T Hesselroth, O Koeroo, T Levshina, S Martin, M Salle, N Sharma, A Sim, S Timm, A Verstegen, "Adoption of a SAML-XACML Profile for Authorization Interoperability across Grid Middleware in OSG and EGEE", Journal of Physics: Conf. Ser. vol. 331, 2011, doi:10.1088/1742-6596/331/6/062011
  29. J Jensen, R Downing, D Ross, A Sim, "Practical Grid Storage Interoperation", J. Grid Comp., Vol 7, Issue 3 (2009), p. 309. DOI: 10.1007/s10723-009-9127-2
  30. M. Riedel, E. Laure, T. Soddemann, A. Sim, V. Natarajan, A. Shoshani, J. Gu, et al., "Interoperation of world-wide production e-Science infrastructures", Concurrency and Computation: Practice and Experience 21(8): 961-990 (2009)
  31. A. Shoshani, F. Donno, J. Gu, J. Hick, M. Litmaath, A. Sim, "Dynamic Storage Management", Book Chapter in Scientific Data Management: Challenges, Technology, and Deployment, Arie Shoshani and Doron Rotem, Editors, Chapman & Hall/CRC Computational Science, 2009
  32. D. N. Williams, R. Ananthakrishnan, D. E. Bernholdt, S. Bharathi, D. Brown, M. Chen, A. L. Chervenak, L. Cinquini, R. Drach, I. T. Foster, P. Fox, D. Fraser, J. Garcia, S. Hankin, P. Jones, D. E. Middleton, J. Schwidder, R. Schweitzer, R. Schuler, A. Shoshani, F. Siebenlist, A. Sim, W. G. Strand, M. Su, N. Wilhelmi, "The Earth System Grid: Enabling Access to Multimodel Climate Simulation Data", American Meteorological Society, Vol. 90, No. 2, 195-205, 2009
  33. P. Jakl, J. Lauret, A. Hanushevsky, A. Shoshani, A. Sim and J. Gu, "Grid data access on widely distributed worker nodes using scalla and SRM", 2008, J. Phys.: Conf. Ser. 119 072019 doi:10.1088/1742- 6596/119/7/072019
  34. C. S. Chang, S. Klasky, J. Cummings, R. Samtaney, A. Shoshani, A. Sim, et al., "Toward a first-principles integrated simulation of tokamak edge plasmas", 2008, J. Phys.: Conf. Ser. 125 012042 doi:10.1088/1742-6596/125/1/012042
  35. R Ananthakrishnan, D E Bernholdt, S Bharathi, D Brown, M Chen, A L Chervenak, L Cinquini, R Drach, I T Foster, P Fox, D Fraser, K Halliday, S Hankin, P Jones, C Kesselman, D E Middleton, J Schwidder, R Schweitzer, R Schuler, A Shoshani, F Siebenlist, A Sim, W G Strand, N Wilhelmi, M Su, D N Williams, "Building a global federation system for climate change research: the earth system grid center for enabling technologies (ESG-CET)", 2007, J. Phys.: Conf. Ser. 78 012050 doi:10.1088/1742- 6596/78/1/012050
  36. A. Shoshani, A. Sim, K. Stockinger, "RRS: Replica Registration Service for Data Grids", Lecture Notes in Computer Science, Edited by Jean-Marc Pierson, Springer-Verlag GmbH Publisher, Volume 3836, pp. 100-112, Dec 2006
  37. D. E. Middleton, D. E. Bernholdt, D. Brown, M. Chen, A. L. Chervenak, L. Cinquini, R. Drach, P. Fox, P. Jones, C. Kesselman, I. T. Foster, V. Nefedova, A. Shoshani, A. Sim, W. G. Strand and D. Williams, "Enabling worldwide access to climate simulation data: the earth system grid (ESG)", Journal of Physics: Conference Series 46(2006), 510-514, 2006.
  38. D. Bernholdt, S. Bharathi, D. Brown, K. Chanchio, M. Chen, A. Chervenak, L. Cinquini, B. Zrach, I. Foster, P. Fox, J. Garcia, C. Kesselman, R. Markel, D. Middleton, V. Nefedova, L. Pouchard, A. Shoshani, A. Sim, G. Strand, D. Williams, "The Earth System Grid: Supporting the Next Generation of Climate Modeling Research", IEEE Vol. 93, No. 3, 485-495, 2005
  39. Arie Shoshani, Alexander Sim, Junmin Gu, "Storage Resource Managers: Essential Components for the Grid", Grid Resource Management: State of the Art and Future Trends, Edited by Jarek Nabrzyski, Jennifer M. Schopf, Jan Weglarz, Kluwer Academic Publishers, 2003
  40. A. L. Chervenak, E. Deelman, C. Kesselman, W. E. Allcock, I. T. Foster, V. Nefedova, J. Lee, A. Sim, A. Shoshani, B. Drach, D. Williams, D. Middleton, "High-performance remote access to climate simulation data: a challenge problem for data grid technologies", Parallel Computing 29(10): 1335-1356, 2003.
  41. L. Bernardo, B. Gibbard, D. Malon, H. Nordberg, D. Olson, R. Porter, A. Shoshani, A. Sim, A. Vaniachine, T. Wenaus, K. Wu, D. Zimmerman, "New Capabilities in the HENP Grand Challenge Storage Access System and its Application at RHIC", Journal of Computer Physics Communications, 2001
  42. A. Sim, H. Nordberg, L.M. Bernardo, A. Shoshani, D. Rotem, "Experience with using CORBA to implement a file caching coordination system", Concurrency and Computation: Practice and Experience, Vol. 13, 1-15, 2001
  43. A. Sim, B. Parvin, P. Keagy, "Invariant Representation and Classification of Fruits from X-ray Images", International Journal of Imaging Systems and Technology, Vol. 7, 231-237, 1996

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