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Data Center is a multifunctional infrastructure that consists of thousands of compute servers and network devices. The fat-tree topology is widely adopted because of its efficiency and safety. However, the fat-tree topology can not completely meet the time-varying communication needs from physical and virtual machines. 60 GHz wireless technology was then incorporated into data centers for its high...
For all Locator Identity Split protocols to work, a mapping infrastructure is required to maintain the binding between the Locators and Identifiers. However, the mapping infrastructure naturally becomes one of the main scalability concerns when there are a large number of mobile nodes to support. This paper implements and evaluates a tiered architecture in which the mapping infrastructure is divided...
In this paper proposed highly efficiency PSU(Power Supply Unit) for server power supply. To minimize power conversion loss, PFC(Power Factor Collection) circuit was designed into Bridgeless PFC using two switching components with 2 SiC diodes, and synchronous rectifier switching method was applied. An isolated DC/DC converter used LLC SRC(Series Resonance Converter) to increase power efficiency and...
Software-Defined Networking not only addresses the shortcoming of traditional network technologies in dealing with frequent and immediate changes in cloud data centers but also made network resource management open and innovation-friendly. To further accelerate the innovation pace, accessible and easy-to-learn testbeds are required which estimate and measure the performance of network and host capacity...
Electrical Distribution Networks face new challenges by the Smart Grid deployment. The required metering infrastructures add new vulnerabilities that need to be taken into account in order to achieve Smart Grid functionalities without considerable reliability trade-off. In this paper, a qualitative assessment of the cyber attack impact on the Advanced Metering Infrastructure (AMI) is initially attempted...
The deployment of new security technologies in existing network topologies requires exhaustive testing before usage to avoid down time of the production systems. Nowadays, the required testing is in many cases omitted due to the complexity of creating test cases and experimental set ups. The VISA (Virtual IT Security Architectures) project [1], funded by the German Federal Ministry of Research, aims...
The increasing complexity and sophistication of the applications deployed on Data Center Network (DCN) demanded new features and greater performance from the DCN. This resulted in many designs addressing various challenges such as cost, performance, reliability, scalability, security and energy. One major challenge a designer often faces is the realization of their proposed design or realization of...
The deployment of new security technologies in existing network topologies requires exhaustive testing before usage to avoid down time of productive systems. Nowadays, the required testing is omitted in many cases due to the complexity of creating test cases and experimental set ups. The VISA (Virtual IT Security Architectures) project, funded by the German Federal Ministry of Research, aims to provide...
Enterprise information systems (EIS) nowadays experience the problem of over maintenance and increased operational costs due to the installation of many servers to accommodate either new or existing projects/applications. Most of the servers are underutilized and consumed more electrical power due to cooling and operative expenses. In this paper, we have proposed a server consolidation scheme to improve...
Since peer-to-peer (P2P) applications like BitTorrent are prevalent on the Internet, the amount of Internet traffic is explosively growing. The traffic caused by P2P applications to share large files have a considerable impact on the network operation, because P2P applications significantly consume network resources and often saturate the capacity of broadband access, inter-domain, or international...
Designing data centers with adequate performance and at the right scale is a difficult task. The load in terms of network and CPU utilization is hard to estimate without appropriate tools. In this paper we introduce a data center performance estimation system which can support planning data centers and application deployments. The tool takes data center topologies and applications and calculates the...
Fault tolerance in distributed systems relies heavily on some form of replication. Replication can also be used to reduce the access latency and the bandwidth consumption in large scale distributed systems. However, in case of large volumes of data, the replica placing strategy and the consistency algorithms become key factors for the performance of the data replication strategy. We present a simulation...
As the number of wireless sensor network applications continues to grow, the need for specialized task scheduling mechanisms, aware of the sensor devices' capabilities and real-time resource availability, is becoming more and more apparent. In this paper, we therefore propose a generic model for task scheduling in heterogeneous networks, which we subsequently use to schedule distributed reasoning...
In this work, we propose using video caching in the wireless relay networks (WRNs) for video on demand (VoD) service. We assume the relay station (RS) of the WRNs is capable of caching a small portion of the ongoing video stream. The cached video data can be used to accommodate new user requests. Previous works on video caching for VoD are in the context of overlay network, where the physical topology...
Multicast join delay is an important metric to evaluate the performance of multicast services. However, there is little analytic study of this metric. In this paper, we convert the multicast join delay into the average node-tree distance problem in the graph, and propose an area-overlay method to analyze the multicast join delay against the different topology sizes and multicast densities. We set...
The Gnutella protocol of peer-to-peer (P2P) networks has undergone several changes since its inception in the beginning of this century. However, despite the large number of revisions to the original version of the protocol, Gnutella suffers from serious problems of dead searches, complexity in study of network topology and network overloading. In this paper, we report the development of a new P2P...
An apparent constraint on the Network Simulator (NS-2) is that it does not currently allow for dynamic interaction between itself and the users while a network simulation process is running. Having realized the advantages of NS, it is interesting to investigate the feasibility to develop a mechanism that would enable the dynamic interaction between the users and NS itself. This paper is focused on...
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