The Experts below are selected from a list of 142134 Experts worldwide ranked by ideXlab platform

David G Andersen - One of the best experts on this subject based on the ideXlab platform.

  • csamp a system for network wide Flow Monitoring
    Networked Systems Design and Implementation, 2008
    Co-Authors: Vyas Sekar, Hui Zhang, Michael K Reiter, Walter Willinger, Ramana Rao Kompella, David G Andersen
    Abstract:

    Critical network management applications increasingly demand fine-grained Flow level measurements. However, current Flow Monitoring solutions are inadequate for many of these applications. In this paper, we present the design, implementation, and evaluation of CSAMP, a system-wide approach for Flow Monitoring. The design of CSAMP derives from three key ideas: Flow sampling as a router primitive instead of uniform packet sampling; hash-based packet selection to achieve coordination without explicit communication; and a framework for distributing responsibilities across routers to achieve network-wide Monitoring goals while respecting router resource constraints. We show that CSAMP achieves much greater Monitoring coverage, better use of router resources, and enhanced ability to satisfy network-wide Flow Monitoring goals compared to existing solutions.

  • NSDI - CSAMP: a system for network-wide Flow Monitoring
    2008
    Co-Authors: Vyas Sekar, Hui Zhang, Michael K Reiter, Walter Willinger, Ramana Rao Kompella, David G Andersen
    Abstract:

    Critical network management applications increasingly demand fine-grained Flow level measurements. However, current Flow Monitoring solutions are inadequate for many of these applications. In this paper, we present the design, implementation, and evaluation of CSAMP, a system-wide approach for Flow Monitoring. The design of CSAMP derives from three key ideas: Flow sampling as a router primitive instead of uniform packet sampling; hash-based packet selection to achieve coordination without explicit communication; and a framework for distributing responsibilities across routers to achieve network-wide Monitoring goals while respecting router resource constraints. We show that CSAMP achieves much greater Monitoring coverage, better use of router resources, and enhanced ability to satisfy network-wide Flow Monitoring goals compared to existing solutions.

Vyas Sekar - One of the best experts on this subject based on the ideXlab platform.

  • one sketch to rule them all rethinking network Flow Monitoring with univmon
    ACM Special Interest Group on Data Communication, 2016
    Co-Authors: Zaoxing Liu, Vyas Sekar, Antonis Manousis, Gregory Vorsanger, Vladimir Braverman
    Abstract:

    Network management requires accurate estimates of metrics for traffic engineering (e.g., heavy hitters), anomaly detection (e.g., entropy of source addresses), and security (e.g., DDoS detection). Obtaining accurate estimates given router CPU and memory constraints is a challenging problem. Existing approaches fall in one of two undesirable extremes: (1) low fidelity general-purpose approaches such as sampling, or (2) high fidelity but complex algorithms customized to specific application-level metrics. Ideally, a solution should be both general (i.e., supports many applications) and provide accuracy comparable to custom algorithms. This paper presents UnivMon, a framework for Flow Monitoring which leverages recent theoretical advances and demonstrates that it is possible to achieve both generality and high accuracy. UnivMon uses an application-agnostic data plane Monitoring primitive; different (and possibly unforeseen) estimation algorithms run in the control plane, and use the statistics from the data plane to compute application-level metrics. We present a proof-of-concept implementation of UnivMon using P4 and develop simple coordination techniques to provide a ``one-big-switch'' abstraction for network-wide Monitoring. We evaluate the effectiveness of UnivMon using a range of trace-driven evaluations and show that it offers comparable (and sometimes better) accuracy relative to custom sketching solutions.

  • csamp a system for network wide Flow Monitoring
    Networked Systems Design and Implementation, 2008
    Co-Authors: Vyas Sekar, Hui Zhang, Michael K Reiter, Walter Willinger, Ramana Rao Kompella, David G Andersen
    Abstract:

    Critical network management applications increasingly demand fine-grained Flow level measurements. However, current Flow Monitoring solutions are inadequate for many of these applications. In this paper, we present the design, implementation, and evaluation of CSAMP, a system-wide approach for Flow Monitoring. The design of CSAMP derives from three key ideas: Flow sampling as a router primitive instead of uniform packet sampling; hash-based packet selection to achieve coordination without explicit communication; and a framework for distributing responsibilities across routers to achieve network-wide Monitoring goals while respecting router resource constraints. We show that CSAMP achieves much greater Monitoring coverage, better use of router resources, and enhanced ability to satisfy network-wide Flow Monitoring goals compared to existing solutions.

  • NSDI - CSAMP: a system for network-wide Flow Monitoring
    2008
    Co-Authors: Vyas Sekar, Hui Zhang, Michael K Reiter, Walter Willinger, Ramana Rao Kompella, David G Andersen
    Abstract:

    Critical network management applications increasingly demand fine-grained Flow level measurements. However, current Flow Monitoring solutions are inadequate for many of these applications. In this paper, we present the design, implementation, and evaluation of CSAMP, a system-wide approach for Flow Monitoring. The design of CSAMP derives from three key ideas: Flow sampling as a router primitive instead of uniform packet sampling; hash-based packet selection to achieve coordination without explicit communication; and a framework for distributing responsibilities across routers to achieve network-wide Monitoring goals while respecting router resource constraints. We show that CSAMP achieves much greater Monitoring coverage, better use of router resources, and enhanced ability to satisfy network-wide Flow Monitoring goals compared to existing solutions.

Hui Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Deep cerebral venous blood Flow Monitoring by transcranial doppler ultrasonography in the treatment of cerebral venous sinus thrombosis: A case report
    Journal of clinical ultrasound : JCU, 2020
    Co-Authors: Hui Zhang, Liangyu Zou, Jian Deng, Yi Guo
    Abstract:

    We report the case of a patient in whom we used deep cerebral venous blood Flow Monitoring by transcranial Doppler ultrasonography to monitor the effect of anticoagulation therapy on cerebral venous sinus thrombosis. The blood Flow velocity of deep cerebral veins increased in the early stage of cerebral venous sinus thrombosis, then gradually decreased to the normal level as the disease improved. Moreover, the recovery of the blood Flow velocity of deep cerebral veins occurred earlier than the morphological recovery demonstrated by magnetic resonance venography.

  • csamp a system for network wide Flow Monitoring
    Networked Systems Design and Implementation, 2008
    Co-Authors: Vyas Sekar, Hui Zhang, Michael K Reiter, Walter Willinger, Ramana Rao Kompella, David G Andersen
    Abstract:

    Critical network management applications increasingly demand fine-grained Flow level measurements. However, current Flow Monitoring solutions are inadequate for many of these applications. In this paper, we present the design, implementation, and evaluation of CSAMP, a system-wide approach for Flow Monitoring. The design of CSAMP derives from three key ideas: Flow sampling as a router primitive instead of uniform packet sampling; hash-based packet selection to achieve coordination without explicit communication; and a framework for distributing responsibilities across routers to achieve network-wide Monitoring goals while respecting router resource constraints. We show that CSAMP achieves much greater Monitoring coverage, better use of router resources, and enhanced ability to satisfy network-wide Flow Monitoring goals compared to existing solutions.

  • NSDI - CSAMP: a system for network-wide Flow Monitoring
    2008
    Co-Authors: Vyas Sekar, Hui Zhang, Michael K Reiter, Walter Willinger, Ramana Rao Kompella, David G Andersen
    Abstract:

    Critical network management applications increasingly demand fine-grained Flow level measurements. However, current Flow Monitoring solutions are inadequate for many of these applications. In this paper, we present the design, implementation, and evaluation of CSAMP, a system-wide approach for Flow Monitoring. The design of CSAMP derives from three key ideas: Flow sampling as a router primitive instead of uniform packet sampling; hash-based packet selection to achieve coordination without explicit communication; and a framework for distributing responsibilities across routers to achieve network-wide Monitoring goals while respecting router resource constraints. We show that CSAMP achieves much greater Monitoring coverage, better use of router resources, and enhanced ability to satisfy network-wide Flow Monitoring goals compared to existing solutions.

Ding Han-bin - One of the best experts on this subject based on the ideXlab platform.

  • Clinical Value of Umbilical Blood Flow Monitoring for Diagnosing Fetues Umbilical Cord Around Neck(UCAN)
    Chinese Journal of General Practice, 2008
    Co-Authors: Ding Han-bin
    Abstract:

    Objective To investigate the clinical value of cord blood Flow Monitoring for diagnosing UCAN and discuss the relationship between fetal intrauterine hypoxia and UCAN.Methods The pregnant women(37-42 gestational weeks) were examined by Cord Blood Flow Monitoring,UCAN was diagnosed and umbilical artery peak systolic velocity(S),end-diastolic velocity(D) were measured,the ratio of S/D was calculated.Results 100 pregnant women were diagnosed as UCAN by cord blood Flow Monitoring,92 were confirmed after delivery.Conclusions Cord blood Flow Monitoring can not only be used to diagnose UCAN but also show the fetal position inside uterus,it provides a clinical scientific basis for treatment.

Olivier Festor - One of the best experts on this subject based on the ideXlab platform.

  • WiMFlow: a distributed, self-adaptive Architecture for Flow Monitoring in Wireless Mesh Networks
    2010
    Co-Authors: Cristian Popi, Olivier Festor
    Abstract:

    We present WiMFlow, a dynamic and self-organized Flow Monitoring framework in Wireless Mesh Networks. The protocol allows for an autonomic organization of the probes, with the goal of Monitoring all the Flows in the backbone of the mesh network accurately and robustly, while minimizing the overhead introduced by the Monitoring architecture. A new mechanism that adapts the control messages emission interval to changes in the topology is introduced to keep the cost of the Monitoring overlay low. The proposed mechanism is described and the performance of the Monitoring framework is evaluated by simulation and experiments on a small scale wireless mesh network testbed

  • Flow Monitoring in Wireless Mesh Networks
    2009
    Co-Authors: Cristian Popi, Olivier Festor
    Abstract:

    We present a dynamic and self-organized Flow Monitoring framework in Wireless Mesh Networks. An algorithmic mechanism that allows for an autonomic organization of the probes is investigated, with the goal of Monitoring all the Flows in the backbone of the mesh network accurately and robustly, while minimizing the overhead introduced by the Monitoring architecture. The architecture of the system is presented, the probe organization protocol is explained and the performance of the Monitoring framework is evaluated by simulation.

  • AIMS - Flow Monitoring in Wireless MESH Networks
    Scalability of Networks and Services, 2009
    Co-Authors: Cristian Popi, Olivier Festor
    Abstract:

    We present a dynamic and self-organized Flow Monitoring framework in Wireless Mesh Networks. An algorithmic mechanism that allows for an autonomic organization of the probes plane is investigated, with the goal of Monitoring all the Flows in the backbone of the mesh network accurately and robustly, while minimizing the overhead introduced by the Monitoring architecture. The architecture of the system is presented, the probe organization protocol is explained and the performance of the Monitoring framework is evaluated by simulation.