The Experts below are selected from a list of 10518 Experts worldwide ranked by ideXlab platform
Mohamed A. Ali - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Provisioning of survivable heterogeneous multicast and unicast traffic in wdm networks
International Conference on Communications, 2006Co-Authors: A. Khalil, A. Hadjiantonis, Georgios Ellinas, Mohamed A. AliAbstract:The problem of protecting purely multicast connections in WDM mesh network has recently started to receive some attention in the literature. In fact, WDM traffic is heterogeneous in nature and only part of the traffic is multicast and the rest is unicast, therefore we expect the presence of both unicast and multicast traffic in future optical networks. This paper studies the problem of Dynamic Provisioning of survivable heterogeneous unicast and multicast traffic in WDM networks. Specifically, we propose new protection schemes to provision and protect unicast and multicast connection requests against singlelink failures in WDM-mesh networks. The simulation results of the proposed protection schemes are compared with each others and with those found in the literature. The results showed that our proposed scheme TP-OSPT outperforms all other schemes for moderate and large multicast group size. On the other hand, our proposed scheme OCR performs the best for small multicast group size.
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ICC - Dynamic Provisioning of Survivable Heterogeneous Multicast and Unicast Traffic in WDM Networks
2006 IEEE International Conference on Communications, 2006Co-Authors: A. Khalil, A. Hadjiantonis, Georgios Ellinas, Mohamed A. AliAbstract:The problem of protecting purely multicast connections in WDM mesh network has recently started to receive some attention in the literature. In fact, WDM traffic is heterogeneous in nature and only part of the traffic is multicast and the rest is unicast, therefore we expect the presence of both unicast and multicast traffic in future optical networks. This paper studies the problem of Dynamic Provisioning of survivable heterogeneous unicast and multicast traffic in WDM networks. Specifically, we propose new protection schemes to provision and protect unicast and multicast connection requests against singlelink failures in WDM-mesh networks. The simulation results of the proposed protection schemes are compared with each others and with those found in the literature. The results showed that our proposed scheme TP-OSPT outperforms all other schemes for moderate and large multicast group size. On the other hand, our proposed scheme OCR performs the best for small multicast group size.
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Dynamic Provisioning of heterogeneous unicast multicast traffic in ip centric wdm based optical networks
2005Co-Authors: Mohamed A. Ali, A. KhalilAbstract:This thesis considers the problem of Dynamically Provisioning heterogeneous unicast/multicast traffic in next-generation IP-Centric WDM networks. Specifically, this work examines, through computer simulation and modeling, the technological requirements and assesses the performance analysis and feasibility for implementing next-generation data-centric optical networks capable of supporting real-time unicast as well as emerging multicast applications. Provisioning of either unicast or multicast connections requires algorithms for route (paths) selection, and signaling mechanisms to request and establish connectivity within the network along a chosen route(s). Specifically, this work addresses the implementation issues of the path(s) selection mechanism of the traffic-engineering problem in such a network. Methodologies and associated routing algorithms for computation of unicast/multicast full wavelength channels as well as low-rate traffic streams are devised and outlined. Specifically, this work focuses on developing and implementing reliable, unified constraint-based Dynamic routing models and algorithms within the generalized MPLS framework (GMPLS), to support real-time Provisioning of unicast/multicast full wavelength optical channels as well as low-rate streams (sub-wavelength). To implement our overall objectives, this thesis work is divided to two main phases: (1) Dynamic Provisioning of unicast traffic only with the main goal of using the optimization procedures and performance results obtained in this phase as guidelines for the ultimate objective of Dynamically Provisioning both unicast and multicast traffic. (2) Dynamic Provisioning of heterogeneous unicast and multicast traffic.
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Dynamic Provisioning of heterogeneous unicast/multicast traffic in ip-centric wdm-based optical networks
2005Co-Authors: Mohamed A. Ali, A. KhalilAbstract:This thesis considers the problem of Dynamically Provisioning heterogeneous unicast/multicast traffic in next-generation IP-Centric WDM networks. Specifically, this work examines, through computer simulation and modeling, the technological requirements and assesses the performance analysis and feasibility for implementing next-generation data-centric optical networks capable of supporting real-time unicast as well as emerging multicast applications. Provisioning of either unicast or multicast connections requires algorithms for route (paths) selection, and signaling mechanisms to request and establish connectivity within the network along a chosen route(s). Specifically, this work addresses the implementation issues of the path(s) selection mechanism of the traffic-engineering problem in such a network. Methodologies and associated routing algorithms for computation of unicast/multicast full wavelength channels as well as low-rate traffic streams are devised and outlined. Specifically, this work focuses on developing and implementing reliable, unified constraint-based Dynamic routing models and algorithms within the generalized MPLS framework (GMPLS), to support real-time Provisioning of unicast/multicast full wavelength optical channels as well as low-rate streams (sub-wavelength). To implement our overall objectives, this thesis work is divided to two main phases: (1) Dynamic Provisioning of unicast traffic only with the main goal of using the optimization procedures and performance results obtained in this phase as guidelines for the ultimate objective of Dynamically Provisioning both unicast and multicast traffic. (2) Dynamic Provisioning of heterogeneous unicast and multicast traffic.
A. Khalil - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Provisioning of survivable heterogeneous multicast and unicast traffic in wdm networks
International Conference on Communications, 2006Co-Authors: A. Khalil, A. Hadjiantonis, Georgios Ellinas, Mohamed A. AliAbstract:The problem of protecting purely multicast connections in WDM mesh network has recently started to receive some attention in the literature. In fact, WDM traffic is heterogeneous in nature and only part of the traffic is multicast and the rest is unicast, therefore we expect the presence of both unicast and multicast traffic in future optical networks. This paper studies the problem of Dynamic Provisioning of survivable heterogeneous unicast and multicast traffic in WDM networks. Specifically, we propose new protection schemes to provision and protect unicast and multicast connection requests against singlelink failures in WDM-mesh networks. The simulation results of the proposed protection schemes are compared with each others and with those found in the literature. The results showed that our proposed scheme TP-OSPT outperforms all other schemes for moderate and large multicast group size. On the other hand, our proposed scheme OCR performs the best for small multicast group size.
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ICC - Dynamic Provisioning of Survivable Heterogeneous Multicast and Unicast Traffic in WDM Networks
2006 IEEE International Conference on Communications, 2006Co-Authors: A. Khalil, A. Hadjiantonis, Georgios Ellinas, Mohamed A. AliAbstract:The problem of protecting purely multicast connections in WDM mesh network has recently started to receive some attention in the literature. In fact, WDM traffic is heterogeneous in nature and only part of the traffic is multicast and the rest is unicast, therefore we expect the presence of both unicast and multicast traffic in future optical networks. This paper studies the problem of Dynamic Provisioning of survivable heterogeneous unicast and multicast traffic in WDM networks. Specifically, we propose new protection schemes to provision and protect unicast and multicast connection requests against singlelink failures in WDM-mesh networks. The simulation results of the proposed protection schemes are compared with each others and with those found in the literature. The results showed that our proposed scheme TP-OSPT outperforms all other schemes for moderate and large multicast group size. On the other hand, our proposed scheme OCR performs the best for small multicast group size.
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Dynamic Provisioning of heterogeneous unicast multicast traffic in ip centric wdm based optical networks
2005Co-Authors: Mohamed A. Ali, A. KhalilAbstract:This thesis considers the problem of Dynamically Provisioning heterogeneous unicast/multicast traffic in next-generation IP-Centric WDM networks. Specifically, this work examines, through computer simulation and modeling, the technological requirements and assesses the performance analysis and feasibility for implementing next-generation data-centric optical networks capable of supporting real-time unicast as well as emerging multicast applications. Provisioning of either unicast or multicast connections requires algorithms for route (paths) selection, and signaling mechanisms to request and establish connectivity within the network along a chosen route(s). Specifically, this work addresses the implementation issues of the path(s) selection mechanism of the traffic-engineering problem in such a network. Methodologies and associated routing algorithms for computation of unicast/multicast full wavelength channels as well as low-rate traffic streams are devised and outlined. Specifically, this work focuses on developing and implementing reliable, unified constraint-based Dynamic routing models and algorithms within the generalized MPLS framework (GMPLS), to support real-time Provisioning of unicast/multicast full wavelength optical channels as well as low-rate streams (sub-wavelength). To implement our overall objectives, this thesis work is divided to two main phases: (1) Dynamic Provisioning of unicast traffic only with the main goal of using the optimization procedures and performance results obtained in this phase as guidelines for the ultimate objective of Dynamically Provisioning both unicast and multicast traffic. (2) Dynamic Provisioning of heterogeneous unicast and multicast traffic.
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Dynamic Provisioning of heterogeneous unicast/multicast traffic in ip-centric wdm-based optical networks
2005Co-Authors: Mohamed A. Ali, A. KhalilAbstract:This thesis considers the problem of Dynamically Provisioning heterogeneous unicast/multicast traffic in next-generation IP-Centric WDM networks. Specifically, this work examines, through computer simulation and modeling, the technological requirements and assesses the performance analysis and feasibility for implementing next-generation data-centric optical networks capable of supporting real-time unicast as well as emerging multicast applications. Provisioning of either unicast or multicast connections requires algorithms for route (paths) selection, and signaling mechanisms to request and establish connectivity within the network along a chosen route(s). Specifically, this work addresses the implementation issues of the path(s) selection mechanism of the traffic-engineering problem in such a network. Methodologies and associated routing algorithms for computation of unicast/multicast full wavelength channels as well as low-rate traffic streams are devised and outlined. Specifically, this work focuses on developing and implementing reliable, unified constraint-based Dynamic routing models and algorithms within the generalized MPLS framework (GMPLS), to support real-time Provisioning of unicast/multicast full wavelength optical channels as well as low-rate streams (sub-wavelength). To implement our overall objectives, this thesis work is divided to two main phases: (1) Dynamic Provisioning of unicast traffic only with the main goal of using the optimization procedures and performance results obtained in this phase as guidelines for the ultimate objective of Dynamically Provisioning both unicast and multicast traffic. (2) Dynamic Provisioning of heterogeneous unicast and multicast traffic.
Qingbo Wang - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Provisioning modeling for virtualized multi tier applications in cloud data center
International Conference on Cloud Computing, 2010Co-Authors: Jing Bi, Ruixiong Tian, Qingbo WangAbstract:Dynamic Provisioning is a useful technique for handling the virtualized multi-tier applications in cloud environment. Understanding the performance of virtualized multi-tier applications is crucial for efficient cloud infrastructure management. In this paper, we present a novel Dynamic Provisioning technique for a cluster-based virtualized multi-tier application that employ a flexible hybrid queueing model to determine the number of virtual machines at each tier in a virtualized application. We present a cloud data center based on virtual machine to optimize resources Provisioning. Using simulation experiments of three-tier application, we adopt an optimization model to minimize the total number of virtual machines while satisfying the customer average response time constraint and the request arrival rate constraint. Our experiments show that cloud data center resources can be allocated accurately with these techniques, and the extra cost can be effectively reduced.
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IEEE CLOUD - Dynamic Provisioning Modeling for Virtualized Multi-tier Applications in Cloud Data Center
2010 IEEE 3rd International Conference on Cloud Computing, 2010Co-Authors: Zhiliang Zhu, Ruixiong Tian, Qingbo WangAbstract:Dynamic Provisioning is a useful technique for handling the virtualized multi-tier applications in cloud environment. Understanding the performance of virtualized multi-tier applications is crucial for efficient cloud infrastructure management. In this paper, we present a novel Dynamic Provisioning technique for a cluster-based virtualized multi-tier application that employ a flexible hybrid queueing model to determine the number of virtual machines at each tier in a virtualized application. We present a cloud data center based on virtual machine to optimize resources Provisioning. Using simulation experiments of three-tier application, we adopt an optimization model to minimize the total number of virtual machines while satisfying the customer average response time constraint and the request arrival rate constraint. Our experiments show that cloud data center resources can be allocated accurately with these techniques, and the extra cost can be effectively reduced.
P Goyal - One of the best experts on this subject based on the ideXlab platform.
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agile Dynamic Provisioning of multi tier internet applications
ACM Transactions on Autonomous and Adaptive Systems, 2008Co-Authors: Bhuvan Urgaonkar, Prashant Shenoy, Abhishek Chandra, P Goyal, Timothy WoodAbstract:Dynamic capacity Provisioning is a useful technique for handling the multi-time-scale variations seen in Internet workloads. In this article, we propose a novel Dynamic Provisioning technique for multi-tier Internet applications that employs (1) a flexible queuing model to determine how much of the resources to allocate to each tier of the application, and (2) a combination of predictive and reactive methods that determine when to provision these resources, both at large and small time scales. We propose a novel data center architecture based on virtual machine monitors to reduce Provisioning overheads. Our experiments on a forty-machine Xen/Linux-based hosting platform demonstrate the responsiveness of our technique in handling Dynamic workloads. In one scenario where a flash crowd caused the workload of a three-tier application to double, our technique was able to double the application capacity within five minutes, thus maintaining response-time targets. Our technique also reduced the overhead of switching servers across applications from several minutes to less than a second, while meeting the performance targets of residual sessions.
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Dynamic Provisioning of multi tier internet applications
International Conference on Autonomic Computing, 2005Co-Authors: Bhuvan Urgaonkar, Prashant Shenoy, Abhishek Chandra, P GoyalAbstract:Dynamic capacity Provisioning is a useful technique for handling the multi-time-scale variations seen in Internet workloads. In this paper, we propose a novel Dynamic Provisioning technique for multitier Internet applications that employs (i) a flexible queuing model to determine how much resources to allocate to each tier of the application, and (ii) a combination of predictive and reactive methods that determine when to provision these resources, both at large and small time scales. Our experiments on a forty-machine Linux-based hosting platform demonstrate the responsiveness of our technique in handling Dynamic workloads. In one scenario where a flash crowd caused the workload of a three-tier application to double, our technique was able to double the application capacity within five minutes, thus maintaining response time targets
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ICAC - Dynamic Provisioning of Multi-tier Internet Applications
Second International Conference on Autonomic Computing (ICAC'05), 1Co-Authors: Bhuvan Urgaonkar, Prashant Shenoy, Abhishek Chandra, P GoyalAbstract:Dynamic capacity Provisioning is a useful technique for handling the multi-time-scale variations seen in Internet workloads. In this paper, we propose a novel Dynamic Provisioning technique for multitier Internet applications that employs (i) a flexible queuing model to determine how much resources to allocate to each tier of the application, and (ii) a combination of predictive and reactive methods that determine when to provision these resources, both at large and small time scales. Our experiments on a forty-machine Linux-based hosting platform demonstrate the responsiveness of our technique in handling Dynamic workloads. In one scenario where a flash crowd caused the workload of a three-tier application to double, our technique was able to double the application capacity within five minutes, thus maintaining response time targets
A. Hadjiantonis - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Provisioning of survivable heterogeneous multicast and unicast traffic in wdm networks
International Conference on Communications, 2006Co-Authors: A. Khalil, A. Hadjiantonis, Georgios Ellinas, Mohamed A. AliAbstract:The problem of protecting purely multicast connections in WDM mesh network has recently started to receive some attention in the literature. In fact, WDM traffic is heterogeneous in nature and only part of the traffic is multicast and the rest is unicast, therefore we expect the presence of both unicast and multicast traffic in future optical networks. This paper studies the problem of Dynamic Provisioning of survivable heterogeneous unicast and multicast traffic in WDM networks. Specifically, we propose new protection schemes to provision and protect unicast and multicast connection requests against singlelink failures in WDM-mesh networks. The simulation results of the proposed protection schemes are compared with each others and with those found in the literature. The results showed that our proposed scheme TP-OSPT outperforms all other schemes for moderate and large multicast group size. On the other hand, our proposed scheme OCR performs the best for small multicast group size.
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ICC - Dynamic Provisioning of Survivable Heterogeneous Multicast and Unicast Traffic in WDM Networks
2006 IEEE International Conference on Communications, 2006Co-Authors: A. Khalil, A. Hadjiantonis, Georgios Ellinas, Mohamed A. AliAbstract:The problem of protecting purely multicast connections in WDM mesh network has recently started to receive some attention in the literature. In fact, WDM traffic is heterogeneous in nature and only part of the traffic is multicast and the rest is unicast, therefore we expect the presence of both unicast and multicast traffic in future optical networks. This paper studies the problem of Dynamic Provisioning of survivable heterogeneous unicast and multicast traffic in WDM networks. Specifically, we propose new protection schemes to provision and protect unicast and multicast connection requests against singlelink failures in WDM-mesh networks. The simulation results of the proposed protection schemes are compared with each others and with those found in the literature. The results showed that our proposed scheme TP-OSPT outperforms all other schemes for moderate and large multicast group size. On the other hand, our proposed scheme OCR performs the best for small multicast group size.
