(50) Xiran Zhang, Javier Conejero, Sameh Abdulah, Jorge Ejarque, Ying Sun, Rosa M. Badia, David E. Keyes, Marc G. Genton. “RCOMPSs: A Scalable Runtime System for R Code Execution on Manycore Systems.” Journal of Computational and Graphical Statistics, accepted for publication, 2026. Open-access preprint (arXiv:2505.06896).
(49) Akbudak, Kadir, Hatem Ltaief, Sameh Abdulah, Saber Feki, Bilel Hadri, Rooh Khurram, Mohsin Shaikh, Zhiyong Zhu, David Keyes, Thomas Gruber, and Yuxi Hong. “Balancing Throughput and Energy: Power Provisioning Case Studies for CPU and GPU Workloads.” In Proceedings of the Cray User Group (CUG ’26), 44–54. ACM, 2026. DOI: 10.1145/3837730.3837735.
(48) Magdy, Amr, Yunhan Chang, and Sameh Abdulah. “Quantum-Optimized Spatial Permutations: Minimizing Submatrix Rank for Block-Low-Rank Space-Filling Curves.” In Proceedings of the 3rd Workshop on Quantum Computing and Quantum-Inspired Technology for Data-Intensive Systems and Applications (Q-Data ’26), 23–24. ACM, 2026. DOI: 10.1145/3811628.3811833.
(47) Ahmed, Mahmoud, Sameh Abdulah, Olatunji Ruwase, Sam Ade Jacobs, Mathis Bode, Mohamed Elhoseiny, and David Keyes. Cross-layer energy analysis of multimodal training on Grace Hopper superchips. SC26, 2026 (forthcoming conference, November 2026).
(46) Qilong Pan, Sameh Abdulah, Mustafa Abduljabbar, Hatem Ltaief, Andreas Herten, Mathis Bode, Matthew Pratola, Arindam Fadikar, Marc G. Genton, David E. Keyes, Ying Sun. “Scaled Block Vecchia Approximation for High-Dimensional Gaussian Process Emulation on GPUs.” IEEE Transactions on Parallel and Distributed Systems 37, no. 11 (2026): 2554–2569. DOI: 10.1109/TPDS.2026.3732178. Open-access preprint.
(45) Shi, Jianwei, Sameh Abdulah, Ying Sun, and Marc G. Genton. Fully decentralized inference for spatial data using low-rank models. Journal of the Royal Statistical Society Series B: Statistical Methodology, qkag113, 2026. DOI: 10.1093/jrsssb/qkag113.
Preprints are listed separately from published and accepted work, ordered by their initial arXiv submission date.
Xiran Zhang, Sameh Abdulah, Qinglei Cao, Joshua French, Rabab Alomairy, Marc G. Genton, David E. Keyes. Mixed-Precision GPU Acceleration for Confidence Regions of Spatial Excursion Sets. 2026. arXiv:2610.25039.
Yiping Hong, Xinyu Wang, Sameh Abdulah. Event-Aware Spatiotemporal Precipitation Forecasting with Geographic Context and Physics-Guided Regularization. 2026. arXiv:2610.11211.
Mahmoud Ahmed, Sameh Abdulah, Olatunji Ruwase, Sam Ade Jacobs, Mathis Bode, Mohamed Elhoseiny. LongVU-TTT: Causal Test-Time Training for Visual Resampling in Long Video Understanding. 2026. arXiv:2608.25729.
Eman M. AbouNassar, Amr Elshall, Sameh Abdulah. FedPBS: Proximal-Balanced Scaling Federated Learning Model for Robust Personalized Training for Non-IID Data. 2026. arXiv:2603.13909.
Yiping Hong, Sameh Abdulah, Marc G. Genton, Ying Sun. Fisher Scoring for Exact Matérn Covariance Estimation through Stable Smoothness Optimization. 2026. arXiv:2601.11437.
Jianwei Shi, Sameh Abdulah, Ying Sun, Marc G. Genton. Scalable Asynchronous Federated Modeling for Spatial Data. 2025. arXiv:2510.01771.
Mary Lai O. Salvana, Sameh Abdulah, Minwoo Kim, David Helmy, Ying Sun, Marc G. Genton. MPCR: Multi-Precision Computations Package in R. 2024. arXiv:2406.02701.
(44) Abdulah, Sameh, Mary Lai O. Salvaña, Ying Sun, David E. Keyes, and Marc G. Genton. "High‐Performance Statistical Computing (HPSC): Challenges, Opportunities, and Future Directions." Wiley Interdisciplinary Reviews: Computational Statistics 17, no. 4 (2025): e70052.
(43) Alomairy, Rabab, Sameh Abdulah, Qinglei Cao, Marc G. Genton, David E. Keyes, and Hatem Ltaief. "Sustainably Modeling a Sustainable Future Climate." In 2025 IEEE High Performance Extreme Computing Conference (HPEC), pp. 1-8. IEEE, 2025.
(42) Geng, Zipei, Sameh Abdulah, Ying Sun, Hatem Ltaief, David E. Keyes, and Marc G. Genton. "GPU-Accelerated Modified Bessel Function of the Second Kind for Gaussian Processes." In ISC High Performance 2025 Research Paper Proceedings (40th International Conference), pp. 1-12. Prometeus GmbH, 2025.
(41) Ren, Jie, Hatem Ltaief, Sameh Abdulah, and David E. Keyes. "Accelerating Mixed-Precision Out-of-Core Cholesky Factorization with Static Task Scheduling." In ISC High Performance 2025 Research Paper Proceedings (40th International Conference), pp. 1-12. Prometeus GmbH, 2025.
(40) Pan, Qilong, Sameh Abdulah, Marc G. Genton, and Ying Sun. "Block Vecchia Approximation for Scalable and Efficient Gaussian Process Computations." Technometrics 67, no. 3 (2025): 546–558.
(39) Nag, Pratik, Yiping Hong, Sameh Abdulah, Ghulam A. Qadir, Marc G. Genton, and Ying Sun. "Efficient Large-scale Nonstationary Spatial Covariance Function Estimation Using Convolutional Neural Networks." Journal of Computational and Graphical Statistics 34, no. 2 (2025): 683-696.
(38) Abdulah, Sameh, and W. Atwa. “Robust Frequent Patterns Mining Algorithms on Parallel Systems.” International Journal of Computer Applications 186, no. 36 (2024): 24–30.
(37) Abdulah, Sameh, Jorge Ejarque, Omar Marzouk, Hatem Ltaief, Ying Sun, Marc G. Genton, Rosa M. Badia, and David E. Keyes. "Portability and scalability evaluation of large-scale statistical modeling and prediction software through HPC-ready containers." Future Generation Computer Systems 161 (2024): 248-258.
(36) Abdulah, Sameh, Allison H. Baker, George Bosilca, Qinglei Cao, Stefano Castruccio, Marc G. Genton, David E. Keyes et al. "Boosting earth system model outputs and saving petabytes in their storage using exascale climate emulators." In SC24: International Conference for High Performance Computing, Networking, Storage and Analysis, pp. 1-12. IEEE, 2024.
(35) Chen, Sihan, Sameh Abdulah, Ying Sun, and Marc G. Genton. "On the impact of spatial covariance matrix ordering on tile low‐rank estimation of Matérn parameters." Environmetrics 35, no. 6 (2024): e2868.
(34) Abdelmoniem, A. M., Sameh Abdulah, and W. Atwa. “A Novel Approach to Translate Structural Aggregation Queries to MapReduce Code.” International Journal of Computer Applications 186, no. 33 (2024): 1–10.
(33) X. Zhang et al., "Parallel Approximations for High-Dimensional Multivariate Normal Probability Computation in Confidence Region Detection Applications," 2024 IEEE International Parallel and Distributed Processing Symposium (IPDPS), San Francisco, CA, USA, 2024, pp. 265-276, doi: 10.1109/IPDPS57955.2024.00031.
(32) Q. Pan, S. Abdulah, M. G. Genton, D. E. Keyes, H. Ltaief and Y. Sun, "GPU-Accelerated Vecchia Approximations of Gaussian Processes for Geospatial Data using Batched Matrix Computations," ISC High Performance 2024 Research Paper Proceedings (39th International Conference), Hamburg, Germany, 2024, pp. 1-12, doi: 10.23919/ISC.2024.10528930.
(31) Hong, Yiping, Yan Song, Sameh Abdulah, Ying Sun, Hatem Ltaief, David E. Keyes, and Marc G. Genton. "The third competition on spatial statistics for large datasets." Journal of Agricultural, Biological and Environmental Statistics 28, no. 4 (2023): 618-635.
(30) Wang, Kesen, Sameh Abdulah, Ying Sun, and Marc G. Genton. "Which parameterization of the Matérn covariance function?." Spatial Statistics 58 (2023): 100787.
(29) Cao, Qinglei, Sameh Abdulah, Hatem Ltaief, Marc G. Genton, David Keyes, and George Bosilca. "Reducing data motion and energy consumption of geospatial modeling applications using automated precision conversion." In 2023 IEEE International Conference on Cluster Computing (CLUSTER), pp. 330-342. IEEE, 2023.
(28) Mondal, Sagnik, Sameh Abdulah, Hatem Ltaief, Ying Sun, Marc G. Genton, and David E. Keyes. "Tile low-rank approximations of non-Gaussian space and space-time Tukey g-and-h random field likelihoods and predictions on large-scale systems." Journal of Parallel and Distributed Computing 180 (2023): 104715.
(27) Ltaief, Hatem, Yuxi Hong, Adel Dabah, Rabab Alomairy, Sameh Abdulah, Chris Goreczny, Pawel Gepner, Matteo Ravasi, Damien Gratadour, and David Keyes. "Steering customized ai architectures for hpc scientific applications." In International Conference on High Performance Computing, pp. 125-143. Cham: Springer Nature Switzerland, 2023.
(26) Abdulah, Sameh, Yuxiao Li, Jian Cao, Hatem Ltaief, David E. Keyes, Marc G. Genton, and Ying Sun. "Large‐scale environmental data science with ExaGeoStatR." Environmetrics 34, no. 1 (2023): e2770.
(25) Abdulah, Sameh, Stefano Castruccio, Marc G. Genton, and Ying Sun. “Editorial: Large-Scale Spatial Data Science.” Journal of Data Science 20, no. 4 (2022): 437–438. DOI: 10.6339/22-JDS204EDI.
(24) Abdulah, Sameh, Qinglei Cao, Yu Pei, George Bosilca, Jack Dongarra, Marc G. Genton, David E. Keyes, Hatem Ltaief, and Ying Sun. "Accelerating geostatistical modeling and prediction with mixed-precision computations: A high-productivity approach with PaRSEC." IEEE Transactions on Parallel and Distributed Systems 33, no. 4 (2022): 964-976.
(23) Cao, Qinglei, Sameh Abdulah, Rabab Alomairy, Yu Pei, Pratik Nag, George Bosilca, Jack Dongarra et al. "Reshaping geostatistical modeling and prediction for extreme-scale environmental applications." In SC22: International Conference for High Performance Computing, Networking, Storage and Analysis, pp. 1-12. IEEE, 2022.
(22) Abdulah, Sameh, Faten Alamri, Pratik Nag, Ying Sun, Hatem Ltaief, David E. Keyes, and Marc G. Genton. "The Second Competition on Spatial Statistics for Large Datasets." Journal of Data Science 20, no. 4 (2022): 439-460.
(21) Abdulah, Sameh, Walid Atwa, and Ahmed M. Abdelmoniem. "Active clustering data streams with affinity propagation." ICT Express 8, no. 2 (2022): 276-282.
(20) Salvaña, Mary Lai O., Sameh Abdulah, Hatem Ltaief, Ying Sun, Marc G. Genton, and David E. Keyes. "Parallel space-time likelihood optimization for air pollution prediction on large-scale systems." In Proceedings of the Platform for Advanced Scientific Computing Conference, pp. 1-11. 2022.
(19) Mondal, Sagnik, Sameh Abdulah, Hatem Ltaief, Ying Sun, Marc G. Genton, and David E. Keyes. "Parallel approximations of the Tukey g-and-h likelihoods and predictions for non-Gaussian geostatistics." In 2022 IEEE International Parallel and Distributed Processing Symposium (IPDPS), pp. 379-389. IEEE, 2022.
(18) Huang, Huang, Sameh Abdulah, Ying Sun, Hatem Ltaief, David E. Keyes, and Marc G. Genton. “Rejoinder.” Journal of Agricultural, Biological and Environmental Statistics 26, no. 4 (2021): 621–623. DOI: 10.1007/s13253-021-00471-1.
(17) Huang, Huang, Sameh Abdulah, Ying Sun, Hatem Ltaief, David E. Keyes, and Marc G. Genton. “Competition on Spatial Statistics for Large Datasets.” Journal of Agricultural, Biological, and Environmental Statistics 26, no. 4 (2021): 580–595. https://www.jstor.org/stable/48766031.
(16) Hong, Yiping, Sameh Abdulah, Marc G. Genton, and Ying Sun. "Efficiency assessment of approximated spatial predictions for large datasets." Spatial Statistics 43 (2021): 100517.
(15) Salvaña, M. L. O., Abdulah, S., Huang, H., Ltaief, H., Sun, Y., Genton, M. G., & Keyes, D. E. (2021). High performance multivariate geospatial statistics on manycore systems. IEEE Transactions on Parallel and Distributed Systems, 32(11), 2719-2733.
(14) S. Abdulah, H. Ltaief, Y. Sun, M. G. Genton and D. E. Keyes, "Geostatistical Modeling and Prediction Using Mixed Precision Tile Cholesky Factorization," 2019 IEEE 26th International Conference on High Performance Computing, Data, and Analytics (HiPC), Hyderabad, India, 2019, pp. 152-162, doi: 10.1109/HiPC.2019.00028.
(13) S. Abdulah, H. Ltaief, Y. Sun, M. G. Genton and D. E. Keyes, "Parallel Approximation of the Maximum Likelihood Estimation for the Prediction of Large-Scale Geostatistics Simulations," 2018 IEEE International Conference on Cluster Computing (CLUSTER), Belfast, UK, 2018, pp. 98-108, doi: 10.1109/CLUSTER.2018.00089.
(12) S. Abdulah, H. Ltaief, Y. Sun, M. G. Genton and D. E. Keyes, "ExaGeoStat: A High Performance Unified Software for Geostatistics on Manycore Systems," in IEEE Transactions on Parallel and Distributed Systems, vol. 29, no. 12, pp. 2771-2784, 1 Dec. 2018, doi: 10.1109/TPDS.2018.2850749.
(11) S. Shehab, S. Abdulah and A. Keshk, "Parallel PoMSA for Aligning Multiple Biological Sequences on Multicore Computers," 2018 13th International Conference on Computer Engineering and Systems (ICCES), Cairo, Egypt, 2018, pp. 69-74, doi: 10.1109/ICCES.2018.8639444.
(10) Shehab, Sara, Sameh Abdulah, and Arabi E. Keshk. “A Survey of the State-of-the-Art Parallel Multiple Sequence Alignment Algorithms on Multicore Systems.” International Journal of Computer Applications 182, no. 12 (2018): 1–9. DOI: 10.5120/ijca2018917658.
(9) Sara Shehab, Sameh Shohdy, and Arabi E Keshk. Pomsa: An efficient and precise position-based multiple sequence alignment technique. Journal of Advanced Research in Computing and Applications, 9:14–20, 2017.
(8) S. Shohdy, A. Vishnu, and G. Agrawal, "Fault Tolerant Frequent Pattern Mining," 2016 IEEE 23rd International Conference on High Performance Computing (HiPC), Hyderabad, India, 2016, pp. 12-21, doi: 10.1109/HiPC.2016.012.
(7) S. Shohdy, A. Vishnu, and G. Agrawal, "Fault Tolerant Support Vector Machines," 2016 45th International Conference on Parallel Processing (ICPP), Philadelphia, PA, USA, 2016, pp. 598-607, doi: 10.1109/ICPP.2016.75.
(6) Abdulah, S. M. S. A. (2016). Addressing Disk Bandwidth Wall and Fault-Tolerance for Data-intensive Applications (Doctoral dissertation, The Ohio State University).
(5) Shohdy, Sameh, Yu Su, and Gagan Agrawal. "Accelerating data mining on incomplete datasets by bitmaps-based missing value imputation." DBKDA. 2015.
(4) S. Shohdy, Y. Su and G. Agrawal, "Load Balancing and Accelerating Parallel Spatial Join Operations Using Bitmap Indexing," 2015 IEEE 22nd International Conference on High Performance Computing (HiPC), Bengaluru, India, 2015, pp. 396-405, doi: 10.1109/HiPC.2015.43.
(3) El-sisi, A.B., Shohdy, S.M., Ismail, N. (2010). Reconfigurable Implementation of Karatsuba Multiplier for Galois Field in Elliptic Curves. In: Sobh, T., Elleithy, K., Mahmood, A. (eds) Novel Algorithms and Techniques in Telecommunications and Networking. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3662-9_14
(2) Shohdy, Sameh M., Ashraf B. El-Sisi, and Nabil Ismail. "Hardware Implementation of Efficient Modified Karatsuba Multiplier Used in Elliptic Curves." International Journal of Network Security 11.3 (2010): 155-162.
(1) Shohdy, S.m., El-sisi, A.b., Ismail, N. (2009). FPGA Implementation of Elliptic Curve Point Multiplication over GF(2191). In: Park, J.H., Chen, HH., Atiquzzaman, M., Lee, C., Kim, Th., Yeo, SS. (eds) Advances in Information Security and Assurance. ISA 2009. Lecture Notes in Computer Science, vol 5576. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02617-1_63