Ningfang Mi

Associate Professor
Department of Electrical and Computer Engineering
Northeastern University
Office: 302 Dana Research Center
Phone: (617)373-3028
Fax: (617)373-8970
Email:

Publications

    Refereed Conference Publications

    Acceptance rates are provided when known.

    1. Manoj Saha, Danlin Jia, Janki Bhimani and Ningfang Mi, “MoKE: Modular Key-value Emulator for Realistic Studies on Emerging Storage Devices”, in IEEE 16th International Conference on Cloud Computing (CLOUD'23), June 2023. (Work-in-Progress (WiP) Track)
    2. Danlin Jia, Yiming Xie, Li Wang, Xiaoqian Zhang, Allen Yang, Xuebin Yao, Mahsa Bayati, Pradeep Subedi, Bo Sheng, and Ningfang Mi, "SRC: Mitigate I/O Throughput Degradation in Network Congestion Control of Disaggregated Storage Systems", in 37th IEEE International Parallel & Distributed Processing Symposium (IPDPS'23), May 2023.
    3. Xiaoqian Zhang, Allen Yang, Danlin Jia, Li Wang, Mahsa Bayati, Pradeep Subedi, Xuebin Yao, Bo Sheng, and Ningfang Mi, "DIRS: Dynamic Initial Rate Setting in Congestion Control for Disaggregated Storage Systems", in International Conference on Computing, Networking and Communications (ICNC'23), Feb. 2023.
    4. Danlin Jia, Geng Yuan, Xue Lin and Ningfang Mi, "A Data-Loader Tunable Knob to Shorten GPU Idleness for Distributed Deep Learning", in IEEE 15th International Conference on Cloud Computing (CLOUD'22), July 2022.
    5. Danlin Jia, Tengpeng Li, Xiaoqian Zhang, Li Wang, Mahsa Bayati, Ron Lee, Bo Sheng, and Ningfang Mi, "SNIS: Storage-Network Iterative Simulation for Disaggregated Storage Systems", in 40th IEEE International Performance Computing and Communications Conference (IPCCC'21), Oct. 2021. (Short Paper)
    6. Janki Bhimani, Jingpei Yang, Ningfang Mi, Changho Choi, Manoj Saha, and Adnan Maruf, "Fine-grained control of concurrency within KV-SSDs", in 14th ACM International Systems and Storage Conference (SYSTOR’21), Jun. 2021. Acceptance Rate: 30%.
    7. Danlin Jia, Manoj Pravakar Saha, Janki Bhimani, and Ningfang Mi, "Performance and Consistency Analysis for Distributed Deep Learning Applications", in 39th IEEE International Performance Computing and Communications Conference (IPCCC'20), Oct. 2020. Acceptance Rate: 29.3%.
    8. Mahsa Bayati, Harsh Roogi, Ron Lee, and Ningfang Mi, "Deploying Network Key-Value SSDs to Disaggregate Resources in Big Data Processing Frameworks" in 39th IEEE International Performance Computing and Communications Conference (IPCCC'20), Oct. 2020. Acceptance Rate: 29.3%.
    9. Danlin Jia, Mahsa Bayati, Ron Lee, and Ningfang Mi, "RITA: Efficient Memory Allocation Scheme for Containerized Parallel Systems to Improve Data Processing Latency", in IEEE International Conference on Cloud Computing (IEEE CLOUD'20), Oct. 2020. Acceptance Rate: 20.7%.
    10. Mahsa Bayati, Miriam Leeser, and Ningfang Mi, "Exploiting GPU Direct Access to Non-Volatile Memory to Accelerate Big Data Processing", in IEEE High Performance Extreme Computing Conference (HPEC'20), Sept. 2020. (Outstanding Student Paper Award)
    11. Janki Bhimani, Rajinikanth Pandurangan, Ningfang Mi and Vijay Balakrishnan, "Emulate Processing of Assorted Database Server Applications on Flash-Based Storage in Datacenter Infrastructures", in 38th IEEE International Performance Computing and Communications Conference (IPCCC'19), London, United Kingdom, Oct. 2019. Acceptance Rate: 28.4%.
    12. Danlin Jia, Janki Bhimani, Nam Nguyen, Bo Sheng and Ningfang Mi, "ATuMm: Auto-tuning Memory Manager in Apache Spark", in 38th IEEE International Performance Computing and Communications Conference (IPCCC'19), London, United Kingdom, Oct. 2019. Acceptance Rate: 28.4%.
    13. Janki Bhimani, Tirthak Patel, Ningfang Mi, and Devesh Tiwari, "What does Vibration do to Your SSD?", in 2019 Design Automation Conference (DAC'19), Las Vegas, NV, 2019. Acceptance Rate: 24.3%.
    14. Mahsa Bayati, Janki Sharadkumar Bhimani, Ronald Lee and Ningfang Mi " Exploring Benefits of NVMe SSDs for Big Data Processing in Enterprise Data Centers ", in 5th International Conference on Big Data Computing and Communications (BIGCOM'19), Qingdao, China 2019.
    15. Janki Bhimani, Ningfang Mi, Zhengyu Yang, Jingpei Yang, Rajinikanth Pandurangan, Changho Choi and Vijay Balakrishnan, " Feature Based I/O Stream Identification for Improving Endurance of Multi-Stream SSDs ", in IEEE International Conference on Cloud Computing (IEEE CLOUD'18), San Francisco, CA, 2018. Acceptance Rate: 15%. (Best Paper Award)
    16. Zhengyu Yang, Danli Jia, Stratis Ioannidis, Ningfang Mi, and Bo Sheng, " Intermediate Data Caching Optimization for Multi-Stage and Parallel Big Data Frameworks ", in IEEE International Conference on Cloud Computing (IEEE CLOUD'18), San Francisco, CA, 2018. Acceptance Rate: 15%.
    17. Janki Bhimani, Ningfang Mi, and Bo Sheng, " BloomStream: Data Temperature Identification for Flash Based Memory Storage Using Bloom Filters ", in IEEE International Conference on Cloud Computing (IEEE CLOUD'18), San Francisco, CA, 2018. Acceptance Rate: 15%.
    18. Nam Son Nguyen, Teng Wang, Tengpeng Li, Xiaoqian Zhang, Bo Sheng, Ningfang Mi, and Bin Zhao " OWLBIT: Orchestrating Wireless Transmissions for Launching Big Data Platforms in an Internet of Things Environment ", in IEEE International Conference on Cloud Computing (IEEE CLOUD'18), San Francisco, CA, 2018. Acceptance Rate: 15%.
    19. Teng Wang, Nam Son Nguyen, Jiayin Wang, Tengpeng Li, Xiaoqian Zhang, Ningfang Mi, Bin Zhao, and Bo Sheng " RoVEr: Robust and Verifiable Erasure Code for Hadoop Distributed File Systems ", in 27th International Conference on Computer Communication and Networks (ICCCN'18), Hangzhou, China, 2018. Acceptance Rate: 25%.
    20. Zhengyu Yang, Morteza Hoseinzadeh, Ping Wong, John Artoux, Clay Mayers, David Thomas Evans, Rory Thomas Bolt, Janki Bhimani, Ningfang Mi, and Steven Swanson, " H-NVMe: A Hybrid Framework of NVMe-based Storage System in Cloud Computing Environment ", in 36th IEEE International Performance Computing and Communications Conference (IPCCC'17), San Diego, CA, 2017. (Best Paper Award)
    21. Zhengyu Yang, Morteza Hoseinzadeh, Allen Andrews, Clay Mayers, David Thomas Evans, Rory Thomas Bolt, Janki Bhimani, Ningfang Mi, and Steven Swanson, " AutoTiering: Automatic Data Placement Manager in Multi-Tier All-Flash Datacenter ", in 36th IEEE International Performance Computing and Communications Conference (IPCCC'17), San Diego, CA, 2017.
    22. Baiyu Chen, Zhengyu Yang, Siyu Huang, Xianzhi Du, Zhiwei Cui, Janki Bhimani, Xin Xie, and Ningfang Mi, " Cyber-Physical System Enabled Nearby Traffic Flow Modelling for Autonomous Vehicles ", in 36th IEEE International Performance Computing and Communications Conference, Special Session on Cyber Physical Systems: Security, Computing, and Performance (IPCCC-CPS'17), San Diego, CA, 2017.
    23. Rundong Li, Ningfang Mi, Mirek Riedewald, Yizhou Sun, and Yi Yao, " A Case for Abstract Cost Models for Distributed Execution of Analytics Operators ", in 19th International Conference on Big Data Analytics and Knowledge Discovery (DaWaK'17), Lyon, France, 2017.
    24. Janki Bhimani, Zhengyu Yang, Miriam Leeser, and Ningfang Mi, " Accelerating Big Data Applications Using Lightweight Virtualization Framework on Enterprise Cloud ", in 21st IEEE High Performance Extreme Computing Conference (HPEC'17), 2017.
    25. Han Gao, Zhengyu Yang, Janki Bhimani, Teng Wang, Jiayin Wang, Ningfang Mi, and Bo Sheng, " AutoPath: Harnessing Parallel Execution Paths for Efficient Resource Allocation in Multi-Stage Big Data Frameworks ", in The 26th International Conference on Computer Communications and Networks (ICCCN'17), Vancouver, Canada, July 2017. Acceptance Rate: 25.0%.
    26. Teng Wang, Jiayin Wang, Son Nam Nguyen, Zhengyu Yang, Ningfang Mi, and Bo Sheng, " EA2S2 : An Efficient Application-Aware Storage System for Big Data Processing in Heterogeneous Clusters ", in The 26th International Conference on Computer Communications and Networks (ICCCN'17), Vancouver, Canada, July 2017. Acceptance Rate: 25.0%.
    27. Janki Bhimani, Ningfang Mi, Miriam Leeser, and Zhengyu Yang, "FiM: Performance Prediction for Parallel Computation in Iterative Data Processing Applications" in IEEE International Conference on Cloud Computing (Cloud'17), Honolulu, Hawaii, June 2017. (Applications Track)
    28. Jiayin Wang, Teng Wang, Zhengyu Yang, Ying Mao, Ningfang Mi, and Bo Sheng, " SEINA: effective Internal Attack in Hadoop Systems ", in 25th International Conference on Computing, Networking and Communication (ICNC'17), Silicon Valley, USA, Jan. 2017. Acceptance Rate: 29.0%.
    29. Zhengyu Yang, Jianzhe Tai, Janki Bhimani, Jiayin Wang, Ningfang Mi, and Bo Sheng, " GREM: Dynamic SSD Resource Allocation In Virtualized Storage Systems With Heterogeneous IO Workloads ", in 35th IEEE International Performance Computing and Communications Conference (IPCCC'16), Las Vegas, NV, Dec. 2016. Acceptance Rate: 24.7%.
    30. Janki Bhimani, Jingpei Yang, Zhengyu Yang, Ningfang Mi, Qiumin Xu, Manu Awasthi, Rajinikanth Pandurangan, and Vijay Balakrishnan, " Understanding Performance of I/O Intensive Containerized Applications for NVMe SSDs ", in 35th IEEE International Performance Computing and Communications Conference (IPCCC'16), Las Vegas, NV, Dec. 2016. Acceptance Rate: 24.7%.
    31. Jiayin Wang, Teng Wang, Zhengyu Yang, Ningfang Mi, and Bo Sheng, " eSplash: Efficient Speculation in Large Scale Heterogeneous Computing Systems ", in 35th IEEE International Performance Computing and Communications Conference (IPCCC'16), Las Vegas, NV, Dec. 2016. Acceptance Rate: 24.7%.
    32. Janki Bhimani, Miriam Leeser, and Ningfang Mi, " Performance Prediction Techniques for Scalable Large Data Processing in Distributed MPI Systems ", in 35th IEEE International Performance Computing and Communications Conference (IPCCC'16), Las Vegas, NV, Dec. 2016. Poster.
    33. Zhengyu Yang, Jiayin Wang, David Evans, and Ningfang Mi, " AutoReplica: Automatic Data Replica Manager in Distributed Caching and Data Processing Systems” ", in First International workshop on Communication, Computing, and Networking in Cyber Physical Systems (CCNCPS'16), Las Vegas, NV, Dec. 2016.
    34. Zhengyu Yang, Manu Awasthi, Mrinmoy Ghosh, and Ningfang Mi, " A Fresh Perspective on Total Cost of Ownership Models for Flash Storage in Datacenters ", in 8th IEEE International Conference on Cloud Computing Technology and Science (CloudCom'16), Luxembourg, Dec. 2016. Acceptance Rate: 25.9%.
    35. Janki Bhimani, Miriam Leeser, and Ningfang Mi, " Design Space Exploration of GPU Accelerated Cluster Systems for Optimal Data Transfer Using PCIe Bus", in IEEE High Performance Extreme Computing Conference (HPEC'16), Waltham, MA, Sept. 2016.
    36. Yi Yao, Han Gao, Jiayin Wang, Ningfang Mi, and Bo Sheng, "OPERA: Opportunistic and Efficient Resource Allocation in Hadoop YARN by Harnessing Idle Resources", in 25th International Conference on Computer Communication and Networks (ICCCN'16), Waikoloa, Hawaii, Aug. 2016. Acceptance Rate:30%.
    37. Jiayin Wang, Yi Yao, Ying Mao, Bo Sheng, and Ningfang Mi, "OMO: Optimize MapReduce Overlap with a Good Start (Reduce) and a Good Finish (Map)", in IEEE International Performance Computing and Communications Conference (IPCCC'15), Nanjing, China, Dec. 2015. Acceptance Rate: 29.0%. (Best Student Paper Runner-up Award)
    38. Janki Bhimani, Miriam Leeser, and Ningfang Mi, " Accelerating K-Means Clustering with Parallel Implementations and GPU Computing", in IEEE High Performance Extreme Computing Conference (HPEC'15), Waltham, MA, Sept. 2015.
    39. Yi Yao, Jason Lin, Jiayin Wang, Ningfang Mi, and Bo Sheng, "Admission Control in YARN Clusters Based on Dynamic Resource Reservation", in the IFIP/IEEE Integrated Network Management Symposium (IM'15), Ottawa, Canada, May 2015. (Short paper)
    40. Yi Yao, Jiayin Wang, Bo Sheng, Jason Lin, and Ningfang Mi, "HASTE: Hadoop YARN Scheduling Based on Task-Dependency and Resource-Demand", in the IEEE International Conference on Cloud Computing (Cloud'14), June 2014. Acceptance Rate: 20.0%.
    41. Jiayin Wang, Yi Yao, Ying Mao, Bo Sheng, and Ningfang Mi, "FRESH: Fair and Efficient Slot Configuration and Scheduling for Hadoop Clusters", in the IEEE International Conference on Cloud Computing (Cloud'14), June 2014. Acceptance Rate: 30.0%. (Applications and Industry Track)
    42. Yufeng Wang, Chiu Tan, and Ningfang Mi, "Using Elasticity to Improve Inline Data Deduplication Storage Systems", in the IEEE International Conference on Cloud Computing (Cloud'14), June 2014. Acceptance Rate: 30.0%. (Applications and Industry Track)
    43. Deng Liu, Jianzhe Tai, Jack Lo, Ningfang Mi and Xiaoyun Zhu, "vFRM: Flash Resource Manager in VMware ESX Server", in the IFIP/IEEE Network Operations and Management Symposium (NOMS'14), Krakow, Poland, May 2014. Acceptance Rate: 29.0%.
    44. Jianzhe Tai, Bo Sheng, Yi Yao, and Ningfang Mi, " Live Data Migration For Reducing SLA Violations In Multi-tiered Storage Systems", in the IEEE International Workshops on Cloud Analytics (IWCA'14), Boston, MA, March, 2014.
    45. Yi Yao, Jiayin Wang, Bo Sheng and Ningfang Mi, "Using a Tunable Knob for Reducing Makespan of MapReduce Jobs in a Hadoop Cluster", in the Proceedings of the IEEE International Conference on Cloud Computing (Cloud'13), pp. 1-8, Santa Clara Marriott, CA, June 2013. Acceptance Rate: 19.0%.
    46. Yi Yao, Jianzhe Tai, Bo Sheng, and Ningfang Mi, "Scheduling Heterogeneous MapReduce Jobs for Efficiency Improvement in Enterprise Clusters", in the Proceedings of the IFIP/IEEE Integrated Network Management Symposium (IM'13), pp. 872-875, Ghent, Belgium, May 2013. (Short paper) Acceptance Rate: 27.0%.
    47. Zhen Li, Jianzhe Tai, Jiahui Chen, and Ningfang Mi, "ADUS:Adaptive Resource Allocation in Cluster Systems under Heavy-Tailed and Bursty Workloads", in the Proceedings of the IEEE International Conference on Communications (ICC'12), pp. 1214-1218, Ottawa, Canada, June, 2012. Acceptance Rate: 37.0%.
    48. Jianzhe Tai, Juemin Zhang, Jun Li, Waleed Meleis and Ningfang Mi, "ArA: Adaptive Resource Allocation for Cloud Computing Environments under Bursty Workloads", in the Proceedings of IEEE International Performance Computing and Communications Conference (IPCCC'11), Orlando, Florida, Nov. 17-19, 2011. Acceptance Rate: 27.9%.
    49. Yi Yao, Bo Sheng and Ningfang Mi, "DAT: An AP Scheduler using Dynamically Adjusted Time Windows for Crowded WLANs", in the Proceedings of IEEE International Performance Computing and Communications Conference (IPCCC'11), Orlando, Florida, Nov. 17-19, 2011. Acceptance Rate: 34.8%.
    50. Juemin Zhang, Ningfang Mi, Jianzhe Tai and Waleed Meleis, "Decentralized Scheduling of Bursty Workload on Computing Grids", in the Proceedings of IEEE International Conference on Communications (ICC'11), Kyoto, Japan, 2011. Acceptance Rate: 38.5%.,
    51. Andrew Caniff, Lei Lu, Ningfang Mi, Ludmila Cherkasova, and Evgenia Smirni, "Fastrack for Taming Burstiness and Saving Power in Multi-Tiered Systems", in the Proceedings of the 22nd International Teletraffic Congress (ITC'10), Amsterdam, The Netherlands, Sept, 2010. Acceptance Rate: 30%. (Best Student Paper Award)
    52. Lei Lu, Ludmila Cherkasova, V. de Nitto Person, Ningfang Mi, and Evgenia Smirni, "AWAIT: Efficient Overload Management for Busy Multi-tier Web Services under Bursty Workloads", in the Proceedings of the 10th International Conference onWeb Engineering (ICWE'10), Vienna, Austria, July, 2010. Acceptance Rate: 20%.
    53. Giuliano Casale, Ningfang Mi, and Evgenia Smirni, "CWS: a Model-Driven Scheduling Policy for Correlated Workloads", in the Proceedings of the 2010 ACM SIGMETRICS International Conference on Measurement and Modeling of Computer Systems (SIGMETRICS'10), New York, NY, June, 2010. Acceptance Rate: 16%.
    54. Ningfang Mi, Giuliano Casale, Alma Riska, Qi Zhang, and Evgenia Smirni, "Autocorrelation-Driven Load Control in Distributed Systems", in the Proceedings of 17th Annual Meeting of the IEEE/ACM International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS'09), London, U.K., September 2009. Acceptance Rate: 20%.
    55. Ningfang Mi, Giuliano Casale, Ludmila Cherkasova, and Evgenia Smirni, "Injecting Realistic Burstiness to a Traditional Client-Server Benchmark", in the Proceedings of International Conference on Autonomic Computing and Communications (ICAC'09), pp. 149-158, Barcelona, Spain, 2009. Acceptance Rate: 16%.
    56. Alma Riska, Ningfang Mi, Giuliano Casale, and Evgenia Smirni, "Feasibility Regions: Exploiting Trade-offs between Power and Performance in Disk Drives", in the Proceedings of second Workshop on Hot Topics in Measurement & Modeling of Computer Systems (HotMetrics'09), ACM Perf. Eval. Rev, Vol. 37, Issue 3, pp. 49-54, Seattle, WA, 2009.
    57. Ningfang Mi, Alma Riska, Xin Li, Evgenia Smirni, and Erik Riedel, "Restraint Utilization of Idleness for Transparent Scheduling of Background Tasks", in the Proceedings of the 2009 ACM SIGMETRICS international conference on Measurement and modeling of computer systems (SIGMETRICS'09), pp. 205-216, Seattle, WA, 2009. Acceptance Rate: 15%.
    58. Ningfang Mi, Giuliano Casale, Ludmila Cherkasova, and Evgenia Smirni, "Burstiness in Multi-Tier Applications: Symptoms, Causes, and New Models", in ACM/IFIP/USENIX 9th International Middleware Conference (Middleware'08),  pp. 265-286, Leuven, Belgium, 2008. Acceptance Rate: 18%. (Best Paper Award)
    59. Ningfang Mi, Giuliano Casale, and Evgenia Smirni, "Scheduling for Performance and Availability in Systems with Temporal Dependent Workloads", in the International Conference on Dependable Systems and Networks (DSN'08),  pp. 336-345, Anchorage, AK, 2008. Acceptance Rate: 25%.
    60. Ningfang Mi, Alma Riska, Evgenia Smirni, and Erik Riedel, "Enhancing Data Availability through Background Activities", in the International Conference on Dependable Systems and Networks (DSN'08),  pp. 492-501, Anchorage, AK, 2008. Acceptance Rate: 25%.
    61. Ludmila Cherkasova, Kivanc Ozonat, Ningfang Mi, Julie Symons, and Evgenia Smirni, "Anomaly? Application Change? or Workload Change?", in the International Conference on Dependable Systems and Networks (DSN'08),  pp. 452-461, Anchorage, AK, 2008. Acceptance Rate: 25%.
    62. Giuliano Casale, Ningfang Mi, and Evgenia Smirni, "Bound Analysis of Closed Queueing Networks with Workload Burstiness", in the Proceedings of the 2008 ACM SIGMETRICS international conference on Measurement and modeling of computer systems (SIGMETRICS'08), pp. 13-24, Annapolis, Maryland,   2008. Acceptance Rate: 18%.
    63. Giuliano Casale, Ningfang Mi, Ludmila Cherkasova, and Evgenia Smirni, "How to Parameterize Models with Bursty Workloads", in the Proceedings of First Workshop on Hot Topics in Measurement & Modeling of Computer Systems (HotMetrics'08), Annapolis, Maryland,  2008. Acceptance Rate: 27%.
    64. Ningfang Mi, Ludmila Cherkasova, Kivanc Ozonat, Julie Symons, and Evgenia Smirni, "Analysis of Application Performance and Its Change via Representative Application Signatures", accepted in IEEE/IFIP Network Operations and Management Symposium (NOMS'08), Salvador, Brazil, pp. 216-223, 2008. Acceptance Rate: 27%.
    65. Ningfang Mi, Qi Zhang, Alma Riska, and Evgenia Smirni, "Load Balancing for Performance Differentiation in Dual-Priority Clustered Servers", in the 3rd International Conference on the Quantitative Evaluation of Systems (QEST'06), Riverside, CA, pp. 385-394, 2006.
    66. Qi Zhang, Ningfang Mi, Alma Riska, and Evgenia Smirni, "Load Unbalancing to Improve Performance under Autocorrelated Traffic", in the 26th International Conference on Distributed Computing Systems (ICDCS'06), Lisboa, Portugal, pp. 20, Jul. 2006. Acceptance Rate: 14%.
    67. Qi Zhang, Alma Riska, Ningfang Mi, Erik Riedel, and Evgenia Smirni, "Evaluating the Performability of Systems with Background Jobs", in the International Conference on Dependable Systems and Networks (DSN'06), Philadelphia, PA, pp. 495-504, 2006. Acceptance Rate: 18%.
    68. Ovidiu Daescu, Ningfang Mi, Chan-Su Shin, and Alexander Wolff,  "Farthest-Point Queries with Geometric and Combinatorial Constraints", in Proceedings of the Japan Conference on Discrete and Computational Geometry (JCDCG'04), pp. 62-75, 2004.
    69. Ovidiu Daescu, and Ningfang Mi, "Polygonal Path Approximation: a Query Based Approach", in Proceedings of the 14th Annual International Symposium on Algorithms and Computation (ISAAC'03), pp. 36-46, 2003.

Invited Publications

  1. Giuliano Casale, Ningfang Mi, and Evgenia Smirni, "Versatile Models of Systems Using MAP Queueing Networks", in the IEEE International Parallel and Distributed Processing Symposium (IPDPS), Next Generation Software (NGS) Workshop, 2008.
  2. Evgenia Smirni, Qi Zhang, Ningfang Mi, Alma Riska, and Giuliano Casale, " New Results on the Performance Effects of Autocorrelated Flows in Systems ", in the IEEE International Parallel and Distributed Processing Symposium (IPDPS), Next Generation Software (NGS) Workshop, Long Beach, CA, pp. 1-6, 2007.

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