University of Southampton

Displaying 1-40 of 124 results

  • White Papers // Dec 2013

    On Security Monitoring in SDNs A Strategic Outlook

    The recently proposed Software-Defined Networking (SDN) paradigm aims at enabling rapid innovations and reducing operational cost in the network equipments with the separation of the control and data plane. The network switches support the simple forwarding functions while the complex control logics are implemented in a logically centralized controller using...

    Provided By University of Southampton

  • White Papers // Sep 2013

    Enabling High Performance Computing in Cloud Infrastructure using Virtualized GPUs

    With the advent of virtualization and Infrastructure-as-a-Service (IaaS), the broader scientific computing community is considering the use of clouds for their technical computing needs. This is due to the relative scalability, ease of use, advanced user environment customization abilities clouds provide, as well as many novel computing paradigms available for...

    Provided By University of Southampton

  • White Papers // Sep 2013

    Improvement and Analysis of Encryption and Decryption Performance in Cloud Document

    Cloud computing is the hot topic in recent years, and the cloud-based collaborative service is the emerging service. No matter where the users are or which computers the users use, it enables the cloud users to place their data into the cloud. As long as it connects to the Internet,...

    Provided By University of Southampton

  • White Papers // Aug 2013

    A Bayesian Game Formulation of Power Dissipation and Response Time Minimization in a Mobile Cloud Computing System

    The rapidly developing cloud computing and virtualization techniques provide mobile devices with battery energy saving opportunities by allowing them to offload computation and execute applications remotely. A mobile device should judiciously determine whether to offload computation and which portion of application should be offloaded to the cloud. This paper considers...

    Provided By University of Southampton

  • White Papers // Aug 2013

    Hierarchical Virtual Machine Consolidation in a Cloud Computing System

    Improving the energy efficiency of cloud computing systems has become an important issue because the electric energy bill for 24/7 operation of these systems can be quite large. The focus of this paper is on the Virtual Machine (VM) consolidation in a cloud computing system as a way of lowering...

    Provided By University of Southampton

  • White Papers // Jul 2013

    Introducing PRECIP: An API for Managing Repeatable Experiments in the Cloud

    Cloud computing with its on-demand access to resources has emerged as a tool used by researchers from a wide range of domains to run computer-based experiments. In this paper the authors introduce a flexible experiment management API, written in Python, that simplifies and formalizes the execution of scientific experiments on...

    Provided By University of Southampton

  • White Papers // Jul 2013

    Profit-Maximizing Resource Allocation for Multi-tier Cloud Computing Systems under Service Level Agreements

    Pervasive use of cloud computing and resulting rise in the number of hosting datacenters (which provide platform or software services to clients who do not have the means to set up and operate their own facilities) have brought forth many challenges including energy cost, peak power dissipation, cooling, carbon emission,...

    Provided By University of Southampton

  • White Papers // Jun 2013

    Towards Proximity-Aware Application Deployment in Geodistributed Clouds

    In this paper, the authors propose a proximity-aware cloud service selection system to help application providers to deploy their applications in the cloud. Cloud platforms deploy multiple data centers geographically distributed around the world. They argue that proximity plays a very important role to improve the application performance when deploying...

    Provided By University of Southampton

  • White Papers // Jun 2013

    Rethinking Data Management for Big Data Scientific Workflows

    Scientific workflows consist of tasks that operate on input data to generate new data products that are used by subsequent tasks. Workflow management systems typically stage data to computational sites before invoking the necessary computations. In some cases data may be accessed using remote I/O. There are limitations with these...

    Provided By University of Southampton

  • White Papers // May 2013

    Diversity Backpressure Scheduling and Routing with Mutual Information Accumulation in Wireless Ad-hoc Networks

    The authors suggest and analyze algorithms for routing in multi-hop wireless ad-hoc networks that exploit mutual information accumulation as the physical layer transmission scheme, and are capable of routing multiple packet streams (commodities) when only the average channel state information is present and that only locally. The proposed algorithms are...

    Provided By University of Southampton

  • White Papers // May 2013

    Cloud Security with Virtualized Defense and Reputation-based Trust Management

    Internet clouds work as service factories built around web-scale datacenters. The elastic cloud resources and huge datasets processed are subject to security breaches, privacy abuses, and copyright violations. Provisioned cloud resources on-demand is especially vulnerable to cyber attacks. The cloud platforms built by Google, IBM, and Amazon all reveal this...

    Provided By University of Southampton

  • White Papers // Apr 2013

    Structured Lattice Codes for Some Two-User Gaussian Networks With Cognition, Coordination and Two Hops

    The authors study a number of two-user interference networks with multiple-antenna transmitters/receivers (MIMO), transmitter side information in the form of linear combinations (over an appropriate finite-field) of the information messages, and two-hop relaying. They start with a Cognitive Interference Channel (CIC) where one of the transmitters (non-cognitive) has knowledge of...

    Provided By University of Southampton

  • White Papers // Apr 2013

    Event Recommendation in Social Networks with Linked Data Enablement

    In recent years, social networking services have gained phenomenal popularity. They allow the authors to explore the world and share their findings in a convenient way. Event is a critical component in social networks. A user can create, share or join different events in their social circle. In this paper,...

    Provided By University of Southampton

  • White Papers // Apr 2013

    Comparing FutureGrid, Amazon EC2, and Open Science Grid for Scientific Workflows

    Scientists have a number of computing infrastructures available to conduct their research, including grids and public or private clouds. This paper explores the use of these cyber-infrastructures to execute scientific workflows, an important class of scientific applications. It examines the benefits and drawbacks of cloud and grid systems using the...

    Provided By University of Southampton

  • White Papers // Mar 2013

    Complex Modeling and Analysis of Workplace Collaboration Data

    Complex networks arise everywhere. Online social networks are famous complex networks examples due to revolutionizing the way people interact on the web, and permitting in practice the study of interdisciplinary theories that arise from human activities, at both micro (i.e. individual) and macro (i.e. community) level. The vast scale (Big...

    Provided By University of Southampton

  • White Papers // Feb 2013

    Efficient MAC for Distributed Multiuser MIMO Systems

    A distributed multiuser MIMO system consists of several access points which are connected to coordinating servers and operate as a large multi-antenna access point. Thanks to joint decoding and precoding, all transmitted signal power is useful, rather than "Interference". The system has the potential to support constant rates as the...

    Provided By University of Southampton

  • White Papers // Feb 2013

    Optimal Throughput-Outage Trade-off in Wireless One-Hop Caching Networks

    The authors consider a wireless Device-To-Device (D2D) network where the nodes have cached information from a library of possible files. Inspired by the current trend in the standardization of the D2D mode for 4th Generation wireless networks, they restrict to one-hop communication: each node place a request to a file...

    Provided By University of Southampton

  • White Papers // Jan 2013

    Knowledge Management in Enterprise Resource Planning Systems: Support for Financial Transactions

    Enterprise Resource Planning (ERP) system financial modules require that users be able to provide transaction information. Unfortunately, for a number of reasons users need support in the development of transactions. ERP system users have indicated a need for support for users responsible for generating financial entries. This paper presents a...

    Provided By University of Southampton

  • White Papers // Jan 2013

    Application of the Many Sources Asymptotic in Downscaling Internet-Like Networks

    In the authors' earlier paper, they have presented two methods to scale down the topology of the Internet, while preserving important performance metrics. They have shown that the methods can be used to greatly simplify and expedite performance prediction. The key insight that they have leveraged is that only the...

    Provided By University of Southampton

  • White Papers // Dec 2012

    The Application of Cloud Computing to Scientific Workflows: A Study of Cost and Performance

    The current model of transferring data from data centers to desktops for analysis will soon be rendered impractical by the accelerating growth in the volume of science data sets. Processing will instead often take place on high performance servers co-located with data. Evaluations of how new technologies such as cloud...

    Provided By University of Southampton

  • White Papers // Nov 2012

    Heat Diffusion Algorithm for Resource Allocation and Routing in Multihop Wireless Networks

    The authors propose a new scheduling and routing approach, the Heat Diffusion (HD) protocol, using combinatorial analogue of the heat equation in mathematical physics. The algorithm holds for systems subject to time-varying network conditions with general packet arrivals and random topology states, including ad-hoc networks with mobility. Compared to the...

    Provided By University of Southampton

  • White Papers // Oct 2012

    Peer-to-Peer Data Sharing for Scientific Workflows on Amazon EC2

    In this paper, the authors consider the problem of data sharing in scientific workflows running on the cloud. They present the design and evaluation of a peer-to-peer approach to help solve this problem. They compare the performance of their peer-to-peer file manager with that of two network file systems for...

    Provided By University of Southampton

  • White Papers // Sep 2012

    Integrating High Performance File Systems in a Cloud Computing Environment

    In this paper, the authors outline their ongoing efforts to effectively integrate a parallel file system in a cloud environment. They investigate how a Parallel file System (PFS) can be effectively integrated and provided as a service to cloud users running High Performance Computing (HPC) applications, and what would be...

    Provided By University of Southampton

  • White Papers // Sep 2012

    WorkflowSim: A Toolkit for Simulating Scientific Workflows in Distributed Environments

    Simulation is one of the most popular evaluation methods in scientific workflow studies. However, existing workflow simulators fail to provide a framework that takes into consideration heterogeneous system overheads and failures. They also lack the support for widely used workflow optimization techniques such as task clustering. In this paper, the...

    Provided By University of Southampton

  • White Papers // Jul 2012

    Towards a High Performance Virtualized IaaS Deployment

    Scientific computing endeavors have created clusters, grids, and supercomputers as High Performance Computing (HPC) platforms and paradigms. These resources focus on peak performance and computing efficiency, thereby enabling scientific community to tackle non-trivial problems on massively parallel architectures. Meanwhile, efforts to leverage the economies of scale from data center operations...

    Provided By University of Southampton

  • White Papers // Jul 2012

    Virtualized Cloud Computing for Exascale Performance

    In this paper, the authors contend that achieving real exascale performance for a collection of useful applications requires the management features provided by virtualization and cloud computing. The critical concern is to achieve a performance target while minimizing cost and the relevant costs are largely related to bandwidth and power....

    Provided By University of Southampton

  • White Papers // Jul 2012

    Using Clouds for Science, Is It Just Kicking the Can Down the Road?

    Over the past decade grid computing has been put forward as a platform for conducting science. The authors have seen both tightly and loosely coupled parallel applications making use of national and international infrastructures such as the Open Science Grid (OSG), TeraGrid, EGI, and others. These applications have been developed...

    Provided By University of Southampton

  • White Papers // Jun 2012

    Ultra-Wide Bandwidth Timing Networks

    The authors present an algorithm for ultra-precise timing in large wireless networks. Their approach uses physical-layer UWB round-trip time-of-flight measurements to achieve precise timing between any two nodes, and fast re-timing based on UWB pulse broadcasting and diversity combining, allowing the precise timing to "Propagate" through even large-scale networks. The...

    Provided By University of Southampton

  • White Papers // Jun 2012

    Distributed Storage Allocations

    The authors examine the problem of allocating a given total storage budget in a distributed storage system for maximum reliability. A source has a single data object that is to be coded and stored over a set of storage nodes; it is allowed to store any amount of coded data...

    Provided By University of Southampton

  • White Papers // Jun 2012

    Statistical Analysis of the Owl:sameAs Network for Aligning Concepts in the Linking Open Data Cloud

    The massively distributed publication of linked data has brought to the attention of scientific community the limitations of classic methods for achieving data integration and the opportunities of pushing the boundaries of the field by experimenting this collective enterprise that is the linking open data cloud. While reusing existing ontologies...

    Provided By University of Southampton

  • White Papers // Jun 2012

    The Case for Complexity Prediction in Automatic Partitioning of Cloud-Enabled Mobile Applications

    As application demands out-pace the evolution of battery technology, many Smartphone "App" developers will soon explore offloading compute-intensive tasks to the cloud. Such cloud-enabled mobile applications effectively partition application functionality between the phone and the cloud. Application partitioning must be dynamic, to successfully adapt to variability in resource availability. Dynamic...

    Provided By University of Southampton

  • White Papers // May 2012

    Maximum-Likelihood Blind PAM Detection

    Blind sequence detection offers significant gains over conventional symbol-by-symbol detection when channel knowledge is not available at the receiver. However, Maximum-Likelihood (ML) blind sequence detection is often intractable due to exponential complexity in the sequence length. In this paper, the authors develop a polynomial-time ML blind sequence detector for Pulse-Amplitude...

    Provided By University of Southampton

  • White Papers // May 2012

    Wireless Video Content Delivery Through Coded Distributed Caching

    The authors suggest a novel approach to handle the ongoing explosive increase in the demand for video content in mobile devices. They envision femtocell-like base stations, which they call helpers, with weak backhaul links but large storage capabilities. These helpers form a wireless distributed caching network that assists the macro...

    Provided By University of Southampton

  • White Papers // May 2012

    Quality of Information Maximization in Two-Hop Wireless Networks

    An information collection problem in a wireless network with random events is considered. Wireless nodes report on each event using one of multiple reporting formats. Each format has a different quality and uses a different number of bits. Delivering all data in the highest quality format can overload system resources....

    Provided By University of Southampton

  • White Papers // May 2012

    Portfolio Theory-Based Resource Assignment in a Cloud Computing System

    In this paper, the authors explain about the energy-aware resource management in a cloud computing system. Much of the existing work assumes that the resource requirements for various applications are known and given as scalar values. However, it is very difficult to know the exact resource requirements, and thus, it...

    Provided By University of Southampton

  • White Papers // May 2012

    Adaptive Energy Forecasting and Information Diffusion for Smart Power Grids

    Smart Power Grids exemplify an emerging class of Cyber Physical Applications that exhibit Dynamic, Distributed and Data intensive (D3) characteristics along with an always-on paradigm to support operational needs. Smart Grids are an outcome of instrumentation, such as Phasor Measurement Units and Smart Power Meters, that is being deployed across...

    Provided By University of Southampton

  • White Papers // May 2012

    Supercapacitor Leakage in Energy-Harvesting Sensor Nodes: Fact or Fiction?

    As interest in energy-harvesting sensor nodes continues to grow, the use of super-capacitors as energy stores or buffers is gaining popularity. The reasons for their use are numerous, and include their high power density, simple interfacing requirements, simpler measurement of state-of-charge, and a greater number of charging cycles than secondary...

    Provided By University of Southampton

  • White Papers // May 2012

    Energy-Efficient Virtual Machine Replication and Placement in a Cloud Computing System

    By utilizing Virtual Machines (VM) and doing server consolidation in a datacenter, a cloud provider can reduce the total energy consumption for servicing his clients with little performance degradation. In particular, the cloud provider can take advantage of dissimilar workloads and by assigning these workloads to the same server, can...

    Provided By University of Southampton

  • White Papers // May 2012

    Cryptonite: A Secure and Performant Data Repository on Public Clouds

    Cloud storage has become immensely popular for maintaining synchronized copies of files and for sharing documents with collaborators. However, there is heightened concern about the security and privacy of Cloud-hosted data due to the shared infrastructure model and an implicit trust in the service providers. Emerging needs of secure data...

    Provided By University of Southampton

  • White Papers // Apr 2012

    Design and Comparative Analysis of Single-Path and Epidemic Approaches to Information and Energy Management in Wireless Sensor Networks

    Intelligent energy management is a key challenge in Wireless Sensor Networks. The choice of an appropriate routing algorithm constitutes a critical factor, especially in unstructured networks where, due to their dynamic nature, a reactive routing protocol is necessary. Such networks often favor packet flooding to fulfill this need. One such...

    Provided By University of Southampton

  • White Papers // Dec 2010

    Ultra Low-Power Photovoltaic MPPT Technique for Indoor and Outdoor Wireless Sensor Nodes

    PhotoVoltaic (PV) energy harvesting is commonly used to power wireless sensor nodes. To optimise harvesting efficiency, Maximum Power Point Tracking (MPPT) techniques are often used. Recently-reported techniques focus solely on outdoor applications, being too power-hungry for use under indoor lighting. Additionally, some techniques have required light sensors (or pilot cells)...

    Provided By University of Southampton

  • White Papers // Nov 2009

    Evaluation and Design Exploration of Solar Harvested-Energy Prediction Algorithm

    To respond to variations in solar energy, harvested-energy prediction is essential to harvested-energy management approaches. The effectiveness of such approaches is dependent on both the achievable accuracy and computation overhead of prediction algorithm implementation. This paper presents detailed evaluation of a recently reported solar energy prediction algorithm to determine empirical...

    Provided By University of Southampton

  • White Papers // Nov 2010

    Semi-blind Adaptive Beamforming for High-throughput Quadrature Amplitude Modulation Systems

    A semi-blind adaptive beamforming scheme is proposed for wireless systems that employ high-throughput quadrature amplitude modulation signalling. A minimum number of training symbols, equal to the number of receiver antenna array's elements, are first utilised to provide a rough initial least squares estimate of the beamformer's weight vector. A concurrent...

    Provided By University of Southampton

  • White Papers // Jun 2010

    Augmenting Forearm Crutches with Wireless Sensors for Lower Limb Rehabilitation

    Forearm crutches are frequently used in the rehabilitation of an injury to the lower limb. The recovery rate is improved if the patient correctly applies a certain fraction of their body weight (specified by a clinician) through the axis of the crutch, referred to as Partial Weight Bearing (PWB). Incorrect...

    Provided By University of Southampton

  • White Papers // Jan 2011

    A Novel Preamble Design for OFDM Transmission Parameter Signalling

    A novel preamble design is proposed for orthogonal frequency division multiplexing systems, which exploits the variable distance between a pair of training sequences for the transmission parameter signalling. Compared to the existing P1-symbol based preamble for the second generation digital terrestrial television broadcasting standard, the proposed design maintains the high...

    Provided By University of Southampton

  • White Papers // Jan 2011

    Joint Channel Estimation and Multi-User Detection for SDMA OFDM Based on Dual Repeated Weighted Boosting Search

    A joint channel estimation and Multi-User Detection (MUD) scheme is proposed for multi-user Multiple-Input Multiple-Output (MIMO) Space Division Multiple Access / Orthogonal Frequency-Division Multiplexing (SDMA/OFDM) systems. The authors design a Dual Repeated Weighted Boosting Search (DRWBS) scheme for joint channel estimation and MUD, which is capable of providing 'soft' outputs,...

    Provided By University of Southampton

  • White Papers // Jan 2011

    Adaptive Semi-Blind Space-Time Equalisation for Frequency Selective Rayleigh Fading MIMO Systems

    An adaptive semi-blind Space-Time Equaliser (STE) has recently been proposed based on a concurrent gradient-Newton constant modulus algorithm and soft decision-directed scheme for dispersive Multiple-Input Multiple-Output (MIMO) systems that employ high-throughput quadrature amplitude modulation signalling. The authors investigate the performance of this adaptive semi-blind STE operating in Rayleigh fading MIMO...

    Provided By University of Southampton

  • White Papers // Jul 2008

    AtomsMasher: Personal Reactive Automation for the Web

    The rise of "Web 2.0" has seen an explosion of web sites for the social sharing of personal information. To enable users to make valuable use of the rich yet fragmented sea of public, social, and personal information, data mashups emerged to provide a means for combining and filtering such...

    Provided By University of Southampton

  • White Papers // Jan 2010

    Type and Effect Systems for Dynamically Changing Code Draft Corrections, Do Not Distribute

    The authors extend type and effect analyses to permit dynamically changing effects and dynamically changing code in multi-threaded systems with shared resources. They guarantee that after a well typed modification a set of threads will have the specified desired effects and will continue to safely use the resources. They prove...

    Provided By University of Southampton

  • White Papers // Jun 2008

    An Analysis of the Origin of Ontology Mismatches on the Semantic Web

    Despite the potential of domain ontologies to provide consensual representations of domain-relevant knowledge, the open, distributed and decentralized nature of the Semantic Web means that individuals will rarely, if ever, countenance a common set of terminological and representational commitments during the ontology design process. More often than not, differences between...

    Provided By University of Southampton

  • White Papers // Jun 2008

    A Visual Approach to Semantic Query Design Using a Web-Based Graphical Query Designer

    Query formulation is a key aspect of information retrieval, contributing to both the efficiency and usability of many semantic applications. A number of query languages, such as SPARQL, have been developed for the Semantic Web; however, there are, as yet, few tools to support end users with respect to the...

    Provided By University of Southampton

  • White Papers // Jan 2012

    Optimal Decentralised Dispatch of Embedded Generation in the Smart Grid

    Distribution network operators face a number of challenges; capacity constrained networks, and balancing electricity demand with generation from intermittent renewable resources. Thus, there is an increasing need for scalable approaches to facilitate optimal dispatch in the distribution network. To this end, the authors cast the optimal dispatch problem as a...

    Provided By University of Southampton

  • White Papers // Jan 2011

    Distributed Downlink Multi-Cell Processing Requiring Reduced-Rate Back-Haul Data Exchange

    Different-complexity Multi-Cell Processing (MCP) schemes employing Distributed Signal-to-Interference-Leakage-plus-Noise-Ratio (SILNR) pre-coding techniques are proposed, which require reduced back-haul data exchange in comparison to the conventional-MCP structure. The authors' results demonstrate that the proposed structures are capable of increasing the achievable cell-edge throughput and offering different geographic rate profile distributions as well...

    Provided By University of Southampton

  • White Papers // Jan 2012

    Power Versus Bandwidth Efficiency in Wireless Communications: The Economic Perspective

    The authors carry out a comprehensive analysis of a range of wireless network efficiency considerations. Firstly, they explore the properties and the implications of the power-versus bandwidth efficiency criteria. Secondly, they perform a detailed top-down analysis of a typical commercial wireless network, which emphasizes the inherent differences between the aforementioned...

    Provided By University of Southampton

  • White Papers // Feb 2010

    Secure Naming for a Network of Information

    Several projects propose an information-centric approach to the network of the future. Such an approach makes efficient content distribution possible by making information retrieval host-independent and integrating into the network storage for caching information. Requests for particular content can, thus, be satisfied by any host or server holding a copy....

    Provided By University of Southampton

  • White Papers // May 2012

    Supercapacitor Leakage in Energy-Harvesting Sensor Nodes: Fact or Fiction?

    As interest in energy-harvesting sensor nodes continues to grow, the use of super-capacitors as energy stores or buffers is gaining popularity. The reasons for their use are numerous, and include their high power density, simple interfacing requirements, simpler measurement of state-of-charge, and a greater number of charging cycles than secondary...

    Provided By University of Southampton

  • White Papers // Apr 2012

    Design and Comparative Analysis of Single-Path and Epidemic Approaches to Information and Energy Management in Wireless Sensor Networks

    Intelligent energy management is a key challenge in Wireless Sensor Networks. The choice of an appropriate routing algorithm constitutes a critical factor, especially in unstructured networks where, due to their dynamic nature, a reactive routing protocol is necessary. Such networks often favor packet flooding to fulfill this need. One such...

    Provided By University of Southampton

  • White Papers // Mar 2012

    Towards a Principled and Evolvable Approach to Software Development for Future Wireless Sensor Networks

    Due to the operational demands and requirements diversity in Wireless Sensor Networks (WSNs), great improvements in the software engineering process are required. As WSNs increasingly become essential, even critical, components in Systems-of-Systems (SoSs), the case for verification in the development process is strong. In this paper, the authors present their...

    Provided By University of Southampton

  • White Papers // Apr 2009

    Energy-Aware Simulation for Wireless Sensor Networks

    Energy-aware sensor nodes are usually tightly energy-constrained, execute energy-efficient algorithms, have the ability to interrogate and control the devices used for storing and consuming energy, and often feature one or more sources of energy harvesting. Due to the cost, time and expertise required to deploy a Wireless Sensor Network (WSN),...

    Provided By University of Southampton

  • White Papers // Mar 2009

    Energy Devices for Sensor Networks: Properties for Simulation and Deployment

    Recent developments in microcontroller, radio transceiver, and energy harvesting device design now permit wireless sensor nodes to operate indefinitely from power scavenged from their environment. Many algorithms for conventional sensor networks assume that nodes run directly from non-rechargeable batteries and therefore attempt to conserve energy rather than carefully exploiting it...

    Provided By University of Southampton

  • White Papers // May 2008

    A Structured Hardware/Software Architecture for Embedded Sensor Nodes

    Owing to the limited requirement for sensor processing in early networked sensor nodes, embedded software was generally built around the communication stack. Modern sensor nodes have evolved to contain significant on-board functionality in addition to communications, including sensor processing, energy management, actuation and locationing. The embedded software for this functionality,...

    Provided By University of Southampton

  • White Papers // Aug 2009

    An Accurate Range-Only Tracking System Using Wireless Sensor Networks

    This paper discusses the design of a real-time tracking system targeted for deployment in wireless sensor networks. The proposed system, utilizes accumulated range data from a number of anchor sensor nodes to infer the position and other kinematic variables of a mobile target. To track manoeuvring targets three dynamic models...

    Provided By University of Southampton

  • White Papers // Jun 2010

    Delay Comparison of Automatic Repeat Request Assisted Butterfly Networks

    The average burst delay and the Standard Deviation (SD) of burst delay in the context of the butterfly networks are investigated and compared, when three types of Automatic Repeat reQuest (ARQ) schemes, namely, the Stop-and-Wait ARQ (SW-ARQ), Go-Back-N ARQ (GBN-ARQ) and the Selective-Repeat ARQ (SR-ARQ) are considered. The authors assume...

    Provided By University of Southampton

  • White Papers // Jun 2012

    Statistical Analysis of the Owl:sameAs Network for Aligning Concepts in the Linking Open Data Cloud

    The massively distributed publication of linked data has brought to the attention of scientific community the limitations of classic methods for achieving data integration and the opportunities of pushing the boundaries of the field by experimenting this collective enterprise that is the linking open data cloud. While reusing existing ontologies...

    Provided By University of Southampton

  • White Papers // Apr 2010

    Interference Focusing for Mitigating Cross-Phase Modulation in a Simplified Optical Fiber Model

    A memoryless interference network model is introduced that is based on non-linear phenomena observed when transmitting information over optical fiber using wavelength-division multiplexing. The main characteristic of the model is that amplitude variations on one carrier wave are converted to phase variations on another carrier wave, i.e., the carriers interfere...

    Provided By University of Southampton

  • White Papers // Oct 2011

    Dynamics of Social Interactions in a Network Game

    The authors characterize the social dynamics of human players in a transactional online game. They introduce two new approaches for understanding temporal behavior: the introduction of entropy dynamics, where they measuring the change in the entropy of certain descriptive distributions over the course of a game, and the use of...

    Provided By University of Southampton

  • White Papers // Oct 2012

    Peer-to-Peer Data Sharing for Scientific Workflows on Amazon EC2

    In this paper, the authors consider the problem of data sharing in scientific workflows running on the cloud. They present the design and evaluation of a peer-to-peer approach to help solve this problem. They compare the performance of their peer-to-peer file manager with that of two network file systems for...

    Provided By University of Southampton

  • White Papers // Sep 2011

    Experiences Using GlideinWMS and the Corral Frontend Across Cyberinfrastructures

    Even with Grid technologies, the main mode of access for the current high performance computing and high throughput computing infrastructures today is logging in via ssh. This mode of access locks scientists to particular machines as it is difficult to move the codes and environments between hosts. In this paper,...

    Provided By University of Southampton

  • White Papers // Sep 2013

    Improvement and Analysis of Encryption and Decryption Performance in Cloud Document

    Cloud computing is the hot topic in recent years, and the cloud-based collaborative service is the emerging service. No matter where the users are or which computers the users use, it enables the cloud users to place their data into the cloud. As long as it connects to the Internet,...

    Provided By University of Southampton

  • White Papers // Mar 2011

    Design and Development of a Run-Time Monitor for Multi-Core Architectures in Cloud Computing

    Cloud computing is a new information technology trend that moves computing and data away from desktops and portable PCs into large data centers. The basic principle of cloud computing is to deliver applications as services over the Internet as well as infrastructure. In this paper, the authors design and develop...

    Provided By University of Southampton

  • White Papers // Jun 2013

    Towards Proximity-Aware Application Deployment in Geodistributed Clouds

    In this paper, the authors propose a proximity-aware cloud service selection system to help application providers to deploy their applications in the cloud. Cloud platforms deploy multiple data centers geographically distributed around the world. They argue that proximity plays a very important role to improve the application performance when deploying...

    Provided By University of Southampton

  • White Papers // Mar 2013

    Complex Modeling and Analysis of Workplace Collaboration Data

    Complex networks arise everywhere. Online social networks are famous complex networks examples due to revolutionizing the way people interact on the web, and permitting in practice the study of interdisciplinary theories that arise from human activities, at both micro (i.e. individual) and macro (i.e. community) level. The vast scale (Big...

    Provided By University of Southampton

  • White Papers // Aug 2011

    Social Networking Analysis: A State of the Art and the Effect of Semantics

    In this paper the authors present a comprehensive study of the state of the art in social networking analysis and examine the impact of content analysis and the effects of semantics in social networking analysis research. The authors propose taxonomy of current approaches, classifying them into the following main categories:...

    Provided By University of Southampton

  • White Papers // Jul 2013

    Introducing PRECIP: An API for Managing Repeatable Experiments in the Cloud

    Cloud computing with its on-demand access to resources has emerged as a tool used by researchers from a wide range of domains to run computer-based experiments. In this paper the authors introduce a flexible experiment management API, written in Python, that simplifies and formalizes the execution of scientific experiments on...

    Provided By University of Southampton

  • White Papers // Jun 2013

    Rethinking Data Management for Big Data Scientific Workflows

    Scientific workflows consist of tasks that operate on input data to generate new data products that are used by subsequent tasks. Workflow management systems typically stage data to computational sites before invoking the necessary computations. In some cases data may be accessed using remote I/O. There are limitations with these...

    Provided By University of Southampton

  • White Papers // Apr 2013

    Comparing FutureGrid, Amazon EC2, and Open Science Grid for Scientific Workflows

    Scientists have a number of computing infrastructures available to conduct their research, including grids and public or private clouds. This paper explores the use of these cyber-infrastructures to execute scientific workflows, an important class of scientific applications. It examines the benefits and drawbacks of cloud and grid systems using the...

    Provided By University of Southampton

  • White Papers // Jul 2012

    Using Clouds for Science, Is It Just Kicking the Can Down the Road?

    Over the past decade grid computing has been put forward as a platform for conducting science. The authors have seen both tightly and loosely coupled parallel applications making use of national and international infrastructures such as the Open Science Grid (OSG), TeraGrid, EGI, and others. These applications have been developed...

    Provided By University of Southampton

  • White Papers // Nov 2009

    Scientific Workflow Applications on Amazon EC2

    The proliferation of commercial cloud computing providers has generated significant interest in the scientific computing community. Much recent paper has attempted to determine the benefits and drawbacks of cloud computing for scientific applications. Although clouds have many attractive features, such as virtualization, on-demand provisioning, and \"Pay as the user go\"...

    Provided By University of Southampton

  • White Papers // Oct 2008

    Resource Provisioning Options for Large-Scale Scientific Workflows

    Scientists in many fields are developing large-scale workflows containing millions of tasks and requiring thousands of hours of aggregate computation time. Acquiring the computational resources to execute these workflows poses many challenges for application developers. Although the grid provides ready access to large pools of computational resources, the traditional approach...

    Provided By University of Southampton

  • White Papers // Apr 2013

    Event Recommendation in Social Networks with Linked Data Enablement

    In recent years, social networking services have gained phenomenal popularity. They allow the authors to explore the world and share their findings in a convenient way. Event is a critical component in social networks. A user can create, share or join different events in their social circle. In this paper,...

    Provided By University of Southampton