All Stories

  1. ScaleQsim: Highly Scalable Quantum Circuit Simulation Framework for Exascale HPC Systems

    Article • Proceedings of the ACM on Measurement and Analysis of Computing Systems, December 2025, ACM (Association for Computing Machinery)

    Alex Sim

  2. Imb-FinDiff: Conditional Diffusion Models for Class Imbalance Synthesis of Financial Tabular Data

    Article • November 2024, ACM (Association for Computing Machinery)

    Marco Schreyer, Alex Sim

  3. Predicting Slow Network Transfers in Scientific Computing

    Article • June 2022, ACM (Association for Computing Machinery)

    Alex Sim

  4. Studying Scientific Data Lifecycle in On-demand Distributed Storage Caches

    Article • June 2022, ACM (Association for Computing Machinery)

    Alex Sim

  5. Access Trends of In-network Cache for Scientific Data

    Article • June 2022, ACM (Association for Computing Machinery)

    Alex Sim

  6. SNTA'22

    Article • June 2022, ACM (Association for Computing Machinery)

    Ph.D. Massimo Cafaro, Alex Sim

  7. Automated Feature Selection for Anomaly Detection in Network Traffic Data

    Article • ACM Transactions on Management Information Systems, June 2021, ACM (Association for Computing Machinery)

    Alex Sim

  8. Effective Missing Value Imputation Methods for Building Monitoring Data

    Article • December 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  9. Botnet Detection Using Recurrent Variational Autoencoder

    Article • December 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  10. Enhancing IoT Anomaly Detection Performance for Federated Learning

    Article • December 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  11. Cross-facility science with the Superfacility Project at LBNL

    Article • November 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim, Dr. Suren Byna

  12. Software-Defined Network for End-to-end Networked Science at the Exascale

    Article • Future Generation Computer Systems, September 2020, Elsevier

    Alex Sim

  13. Towards HPC I/O Performance Prediction through Large-scale Log Analysis

    Article • June 2020, ACM (Association for Computing Machinery)

    Alex Sim, Dr. Suren Byna

  14. Access Patterns to Disk Cache for Large Scientific Archive

    Article • June 2020, ACM (Association for Computing Machinery)

    Alex Sim

  15. GPU-based Classification for Wireless Intrusion Detection

    Article • June 2020, ACM (Association for Computing Machinery)

    Alex Sim

  16. understanding scientific data access patterns with data caching within the network

    Article • June 2020, ACM (Association for Computing Machinery)

    Alex Sim

  17. Feature Selection Improves Tree-based Classification for Wireless Intrusion Detection

    Article • June 2020, ACM (Association for Computing Machinery)

    Alex Sim, Shilpa Bhandari

  18. Evaluation of Deep Learning Models for Network Performance Prediction for Scientific Facilities

    Article • June 2020, ACM (Association for Computing Machinery)

    Alex Sim

  19. Transfer Learning Approach for Botnet Detection Based on Recurrent Variational Autoencoder

    Article • June 2020, ACM (Association for Computing Machinery)

    Alex Sim

  20. HPC Workload Characterization Using Feature Selection and Clustering

    Article • June 2020, ACM (Association for Computing Machinery)

    Alex Sim, Dr. Suren Byna

  21. BBOS: Efficient HPC Storage Management via Burst Buffer Over-Subscription

    Article • May 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  22. Predicting Resource Requirement in Intermediate Palomar Transient Factory Workflow

    Article • May 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  23. Clustering Life Course to Understand the Heterogeneous Effects of Life Events, Gender, and Generation on Habitual Travel Modes

    Article • IEEE Access, January 2020, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  24. A Reinforcement Learning Based Network Scheduler for Deadline-Driven Data Transfers

    Article • December 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  25. Federated Wireless Network Intrusion Detection

    Article • December 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  26. Machine Learning for Prediction of Mid to Long Term Habitual Transportation Mode Use

    Article • December 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  27. Spatiotemporal Real-Time Anomaly Detection for Supercomputing Systems

    Article • December 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  28. Evaluating the Effects of Missing Values and Mixed Data Types on Social Sequence Clustering Using t-SNE Visualization

    Article • Journal of Data and Information Quality, June 2019, ACM (Association for Computing Machinery)

    Alex Sim

  29. Co-optimizing Latency and Energy for IoT services using HMP servers in Fog Clusters

    Article • June 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  30. DCA-IO: A Dynamic I/O Control Scheme for Parallel and Distributed File Systems

    Article • May 2019, Institute of Electrical & Electronics Engineers (IEEE)

    Dr. Suren Byna, Alex Sim

  31. A New Approach to Multivariate Network Traffic Analysis

    Article • Journal of Computer Science and Technology, March 2019, Springer Science + Business Media

    Alex Sim

  32. Automatic Detection of Network Traffic Anomalies and Changes

    Article • January 2019, ACM (Association for Computing Machinery)

    Alex Sim

  33. Performance Prediction for Data Transfers in LCLS Workflow

    Article • January 2019, ACM (Association for Computing Machinery)

    Alex Sim

  34. Similarity-based Compression with Multidimensional Pattern Matching

    Article • January 2019, ACM (Association for Computing Machinery)

    Alex Sim

  35. Understanding Parallel I/O Performance Trends Under Various HPC Configurations

    Article • January 2019, ACM (Association for Computing Machinery)

    Alex Sim

  36. Detecting Anomalies in the LCLS Workflow

    Article • December 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  37. Dynamic Online Performance Optimization in Streaming Data Compression

    Article • December 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  38. Predicting Network Traffic Using TCP Anomalies

    Article • December 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  39. Consensus Ensemble System for Traffic Flow Prediction

    Article • IEEE Transactions on Intelligent Transportation Systems, December 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  40. SDN for End-to-End Networked Science at the Exascale (SENSE)

    Article • November 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  41. Auto-Tuned Publisher in a Pub/Sub System: Design and Performance Evaluation

    Article • September 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  42. Modeling Data Transfers: Change Point and Anomaly Detection

    Article • July 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  43. Spatio-Temporal Analysis of HPC I/O and Connection Data

    Article • July 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  44. Identifying Anomalous File Transfer Events in LCLS Workflow

    Article • June 2018, ACM (Association for Computing Machinery)

    Alex Sim

  45. Towards Autonomic Science Infrastructure

    Article • June 2018, ACM (Association for Computing Machinery)

    Alex Sim

  46. Multivariate network traffic analysis using clustered patterns

    Article • Computing, April 2018, Springer Science + Business Media

    Alex Sim

  47. Foreword

    Article • Journal of Discrete Mathematical Sciences and Cryptography, February 2018, Taylor & Francis

    Alex Sim

  48. Feature Engineering and Classification Models for Partial Discharge Events in Power Transformers

    Article • December 2017, ACM (Association for Computing Machinery)

    Alex Sim

  49. Accurate signal timing from high frequency streaming data

    Article • December 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  50. Data quality challenges with missing values and mixed types in joint sequence analysis

    Article • December 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  51. Convolutional Filtering for Accurate Signal Timing from Noisy Streaming Data

    Article • November 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  52. Statistical data reduction for streaming data

    Article • August 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  53. A New Approach to Online, Multivariate Network Traffic Analysis

    Article • July 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  54. Improving Statistical Similarity Based Data Reduction for Non-Stationary Data

    Article • June 2017, ACM (Association for Computing Machinery)

    Alex Sim

  55. Parallel Variable Selection for Effective Performance Prediction

    Article • May 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  56. Expanding Statistical Similarity Based Data Reduction to Capture Diverse Patterns

    Article • April 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  57. A lightweight network anomaly detection technique

    Article • January 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  58. An approach to online network monitoring using clustered patterns

    Article • January 2017, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  59. Towards Real-Time Detection and Tracking of Spatio-Temporal Features: Blob-Filaments in Fusion Plasma

    Article • IEEE Transactions on Big Data, September 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  60. Novel Data Reduction Based on Statistical Similarity

    Article • July 2016, ACM (Association for Computing Machinery)

    Alex Sim

  61. Machine learning based job status prediction in scientific clusters

    Article • July 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  62. Time-Series Forecast Modeling on High-Bandwidth Network Measurements

    Article • Journal of Grid Computing, June 2016, Springer Science + Business Media

    Alex Sim

  63. Visualization and Analysis for Near-Real-Time Decision Making in Distributed Workflows

    Article • May 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  64. Performance Analysis Tool for HPC and Big Data Applications on Scientific Clusters

    Article • January 2016, Springer Science + Business Media

    Alex Sim

  65. Named Data Networking in Climate Research and HEP Applications

    Article • Journal of Physics Conference Series, December 2015, Institute of Physics Publishing

    Alex Sim, Susmit Shannigrahi

  66. PATHA: Performance Analysis Tool for HPC Applications

    Article • December 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  67. Extracting Baseline Electricity Usage Using Gradient Tree Boosting

    Article • December 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  68. Best Predictive Generalized Linear Mixed Model with Predictive Lasso for High-Speed Network Data Analysis

    Article • International Journal of Statistics and Probability, April 2015, Canadian Center of Science and Education

    Alex Sim

  69. Network bandwidth utilization forecast model on high bandwidth networks

    Article • February 2015, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  70. Statistical Overfitting and Backtest Performance

    Article • January 2015, Elsevier

    Alex Sim

  71. Adaptation and Policy-Based Resource Allocation for Efficient Bulk Data Transfers in High Performance Computing Environments

    Article • November 2014, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim, Dr. Suren Byna

  72. Efficient Data Staging Using Performance-Based Adaptation and Policy-Based Resource Allocation

    Article • February 2014, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  73. Estimating and Forecasting Network Traffic Performance Based on Statistical Patterns Observed in SNMP Data

    Article • January 2013, Springer Science + Business Media

    Alex Sim

  74. What SNMP Data Can Tell Us about Edge-to-Edge Network Performance

    Article • January 2013, Springer Science + Business Media

    Alex Sim

  75. Adaptive Data Transfers that Utilize Policies for Resource Sharing

    Article • November 2012, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  76. Efficient Attribute-Based Data Access in Astronomy Analysis

    Article • November 2012, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  77. Experiences with 100Gbps network applications

    Article • January 2012, ACM (Association for Computing Machinery)

    Alex Sim

  78. Adoption of a SAML-XACML Profile for Authorization Interoperability across Grid Middleware in OSG and EGEE

    Article • Journal of Physics Conference Series, December 2011, Institute of Physics Publishing

    Alex Sim

  79. StorNet: Integrated Dynamic Storage and Network Resource Provisioning and Management for Automated Data Transfers

    Article • Journal of Physics Conference Series, December 2011, Institute of Physics Publishing

    Alex Sim

  80. StorNet: Co-scheduling of end-to-end bandwidth reservation on storage and network systems for high-performance data transfers

    Article • April 2011, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  81. Efficient Bulk Data Replication for the EarthSystem Grid

    Article • January 2011, Springer Science + Business Media

    Alex Sim

  82. A Flexible Reservation Algorithm for Advance Network Provisioning

    Article • November 2010, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  83. Finding Tropical Cyclones on a Cloud Computing Cluster: Using Parallel Virtualization for Large-Scale Climate Simulation Analysis

    Article • November 2010, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  84. EFFIS: An End-to-end Framework for Fusion Integrated Simulation

    Article • February 2010, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  85. Lessons learned from moving earth system grid data sets over a 20 Gbps wide-area network

    Article • January 2010, ACM (Association for Computing Machinery)

    Alex Sim

  86. Adaptive Transfer Adjustment in Efficient Bulk Data Transfer Management for Climate Datasets

    Article • January 2010, ACTA Press

    Alex Sim

  87. Scientific Data Management

    Article • December 2009, Taylor & Francis

    Alex Sim

  88. Hadoop distributed file system for the Grid

    Article • October 2009, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  89. Practical Grid Storage Interoperation

    Article • Journal of Grid Computing, August 2009, Springer Science + Business Media

    Alex Sim

  90. FastBit: interactively searching massive data

    Article • Journal of Physics Conference Series, July 2009, Institute of Physics Publishing

    Alex Sim, Gunther Weber

  91. Interoperation of world-wide production e-Science infrastructures

    Article • Concurrency and Computation Practice and Experience, June 2009, Wiley

    Dr David C H Wallom, Alex Sim

  92. The Earth System Grid: Enabling Access to Multimodel Climate Simulation Data

    Article • Bulletin of the American Meteorological Society, February 2009, American Meteorological Society

    Alex Sim

  93. Efficient Operational Profiling of Systems Using Suffix Arrays on Execution Logs

    Article • November 2008, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  94. Grid data access on widely distributed worker nodes using scalla and SRM

    Article • Journal of Physics Conference Series, July 2008, Institute of Physics Publishing

    Alex Sim

  95. Storage resource manager version 2.2: design, implementation, and testing experience

    Article • Journal of Physics Conference Series, July 2008, Institute of Physics Publishing

    Alex Sim

  96. Data management and analysis for the Earth System Grid

    Article • Journal of Physics Conference Series, July 2008, Institute of Physics Publishing

    Alex Sim

  97. Toward a first-principles integrated simulation of tokamak edge plasmas

    Article • Journal of Physics Conference Series, July 2008, Institute of Physics Publishing

    Alex Sim

  98. Storage Resource Managers: Recent International Experience on Requirements and Multiple Co-Operating Implementations

    Article • September 2007, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  99. Building a global federation system for climate change research: the earth system grid center for enabling technologies (ESG-CET)

    Article • Journal of Physics Conference Series, July 2007, Institute of Physics Publishing

    Alex Sim

  100. Enabling worldwide access to climate simulation data: the earth system grid (ESG)

    Article • Journal of Physics Conference Series, September 2006, Institute of Physics Publishing

    Alex Sim

  101. The Earth System Grid: Supporting the Next Generation of Climate Modeling Research

    Article • Proceedings of the IEEE, March 2005, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  102. High-performance remote access to climate simulation data: a challenge problem for data grid technologies

    Article • Parallel Computing, October 2003, Elsevier

    Alex Sim

  103. An ontology for scientific information in a Grid environment: the earth system Grid

    Article • January 2003, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  104. New capabilities in the HENP Grand Challenge Storage Access System and its application at RHIC

    Article • Computer Physics Communications, October 2001, Elsevier

    Alex Sim

  105. Experience with using CORBA to implement a file caching coordination system

    Article • Concurrency and Computation Practice and Experience, January 2001, Wiley

    Alex Sim

  106. Storage access coordination using CORBA

    Article • January 1999, Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  107. Invariant representation and hierarchical network for inspection of nuts from X-ray images

    Article • International Journal of Imaging Systems and Technology, January 1996, Wiley

    Alex Sim

  108. Coordinating simultaneous caching of file bundles from tertiary storage

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim

  109. Multidimensional indexing and query coordination for tertiary storage management

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Alex Sim