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Imperial College London
(98 results)-
White Papers
An Autonomic Approach to Denial of Service Defence
January 1, 2009, 12:00am PST
Denial of service attacks, viruses and worms are common tools for malicious adversarial behaviour in networks. This paper proposes the use of their autonomic routing protocol, the Cognitive Packet...
Provided by Imperial College London
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White Papers
Service Level Agreement Specification, Compliance Prediction and Monitoring With Performance Trees
January 1, 2009, 12:00am PST
Service Level Agreements (SLAs) are widely used throughout industry but suffer from specification ambiguities and difficulties in predicting and monitoring compliance. To address these issues, the...
Provided by Imperial College London
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White Papers
Future of Road Network Management and the Role of Intelligent Transport Systems
October 1, 2008, 12:00am PDT
This paper argues the case for a better integrated approach to transport management, particularly real time road network management. The case is derived both from the need for such an approach to...
Provided by Imperial College London
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White Papers
Data Acquisition and Error Analysis for Pepperpot Emittance Measurements
June 8, 2009, 12:00am PDT
The pepperpot provides a unique and fast method of measuring emittance, providing four dimensional correlated beam measurements for both transverse planes. In order to make such a correlated...
Provided by Imperial College London
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White Papers
Towards Unifying Fault And Change Management
November 8, 2007, 12:00am PST
A basic model for dynamic change management has been proposed which permits changes to be specified declaratively at the configuration level, in terms of structure only. Component nodes can be...
Provided by Imperial College London
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White Papers
Route Capacity Estimation Based Admission Control and QoS Routing for Mesh Networks
September 29, 2009, 12:00am PDT
Wireless Mesh Networks (WMNs) is a promising key technology for next generation wireless backhauling that is expected to support various types of applications with different Quality-of-Service...
Provided by Imperial College London
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White Papers
A Response Time Distribution Model for Zoned RAID
June 11, 2008, 12:00am PDT
RAID systems are widely deployed, both as standalone storage solutions and as the building blocks of modern virtualised storage platforms. An accurate model of RAID system performance is therefore...
Provided by Imperial College London
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White Papers
A Review of Innovation Models
October 12, 2006, 12:00am PDT
Innovation is central to the policy debate on how to maintain strong economic growth in an era that is increasingly being defined by the globalization of competition, as well as major fiscal and...
Provided by Imperial College London
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White Papers
Creating a Digital Ecosystem: Service-Oriented Architectures With Distributed Evolutionary Computing
October 5, 2009, 12:00am PDT
The authors start with a discussion of the relevant literature, including Nature Inspired Comuting as a framework in which to understand this work, and the process of biomimicry to be used in...
Provided by Imperial College London
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White Papers
The Emergence Of Leadership In Social Networks
June 3, 2011, 12:00am PDT
The authors study a networked version of the minority game in which agents can choose to follow the choices made by a neighbouring agent in a social network. They show that for a wide variety of...
Provided by Imperial College London
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White Papers
Noise, Risk Premium, And Bubble
March 17, 2011, 12:00am PDT
The existence of the pricing kernel is shown to imply the existence of an ambient information process that generates market filtration. This information process consists of a signal component...
Provided by Imperial College London
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White Papers
Constrained Mixture Models For Asset Returns Modelling
March 15, 2011, 12:00am PDT
The estimation of asset return distributions is crucial for determining optimal trading strategies. In this paper, the authors describe the constrained mixture model, based on a mixture of Gamma...
Provided by Imperial College London
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White Papers
Conditional Density Models For Asset Pricing
October 21, 2010, 12:00am PDT
The authors model the dynamics of asset prices and associated derivatives by consideration of the dynamics of the conditional probability density process for the value of an asset at some...
Provided by Imperial College London
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White Papers
Constrained Nonsmooth Utility Maximization On The Positive Real Line
October 19, 2010, 12:00am PDT
The authors maximize the expected utility of terminal wealth in an incomplete market where there are cone constraints on the investor's portfolio process and the utility function is not assumed to...
Provided by Imperial College London
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White Papers
Asset Pricing With Random Information Flow
September 21, 2010, 12:00am PDT
In the information-based approach to asset pricing the market filtration is modeled explicitly as a superposition of signals concerning relevant market factors and independent noise. The rate at...
Provided by Imperial College London
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White Papers
UKAIRO: Internet-Scale Bandwidth Detouring
January 15, 2011, 12:00am PST
The performance of content distribution on the Internet is crucial for many services. While popular content can be delivered efficiently to users by caching it using content delivery networks, the...
Provided by Imperial College London
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White Papers
A Symmetry Reduction Technique for Model Checking Temporal-Epistemic Logic
January 14, 2009, 12:00am PST
The authors introduce a symmetry reduction technique for model checking temporal epistemic properties of multi-agent systems defined in the mainstream interpreted systems framework. The technique,...
Provided by Imperial College London
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White Papers
Distributed Fault Tolerant Controllers
November 26, 2009, 12:00am PST
Distributed applications are often built from sets of distributed components that must be co-ordinated in order to achieve some global behaviour. The common approach is to use a centralised...
Provided by Imperial College London
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White Papers
DEFCON: High-Performance Event Processing With Information Security
May 4, 2010, 12:00am PDT
In finance and healthcare, event processing systems handle sensitive data on behalf of many clients. Guaranteeing information security in such systems is challenging because of their strict...
Provided by Imperial College London
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White Papers
Object Capabilities and Isolation of Untrusted Web Applications
March 8, 2010, 12:00am PST
A growing number of current web sites combine active content (applications) from untrusted sources, as in so-called mashups. The object-capability model provides an appealing approach for...
Provided by Imperial College London
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White Papers
Safe Parallel Programming With Session Java
October 25, 2010, 12:00am PDT
The session-typed programming language Session Java (SJ) has proved to be an effective tool for distributed programming, promoting productivity and compile-time safety. This paper investigates the...
Provided by Imperial College London
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White Papers
SQPR: Stream Query Planning With Reuse
November 17, 2010, 12:00am PST
When users submit new queries to a Distributed Stream Processing System (DSPS), a query planner must allocate physical resources, such as CPU cores, memory and network bandwidth, from a set of...
Provided by Imperial College London
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White Papers
Reducing Power Consumption in Wired Networks
July 16, 2009, 12:00am PDT
Over 500 million host computers, three billion PCs and mobile devices consume over a billion kilowatts of electricity. As part of this "System" computer networks consume an increasing amount of...
Provided by Imperial College London
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White Papers
A Novel Weight Initialization Method for the Random Neural Network
April 28, 2008, 12:00am PDT
In this paper, the authors propose a novel weight initialization method for the Random Neural Network. The method relies on approximating the signal-flow equations of the network to obtain a...
Provided by Imperial College London
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White Papers
Packets Traveling in Non-Homogeneous Networks
May 10, 2011, 12:00am PDT
This paper considers a probability model for travel of a packet from a source node to a destination node in a large non-homogeneous multiple hop network with unreliable routing tables. Use of a...
Provided by Imperial College London
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White Papers
Likelihood Ratios and Recurrent Random Neural Networks in Detection of Denial of Service Attacks
April 20, 2007, 12:00am PDT
In a world that is becoming increasingly dependent on Internet communication, Denial of Service (DoS) attacks have evolved into a major security threat which is easy to launch but difficult to...
Provided by Imperial College London
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White Papers
Adaptive Random Re-Routing in Sensor Networks
May 8, 2008, 12:00am PDT
Much of the traffic carried by Sensor Networks will originate from routine measurements or observations by sensors which monitor a particular situation, such as the temperature and humidity in a...
Provided by Imperial College London
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White Papers
Performance Trade-Offs in a Network Coding Router
May 14, 2010, 12:00am PDT
The authors consider the problem of optimizing the performance of a network coding router with two stochastic flows. They develop a queuing model which accounts for the fact that coding is not...
Provided by Imperial College London
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White Papers
A Distributed Admission Control Mechanism for Multi-Criteria QoS
August 26, 2010, 12:00am PDT
Admission control based on multiple criteria has always been a desirable feature for computer networks. In the past, the authors presented such a system, but it was based on a centralised decision...
Provided by Imperial College London
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White Papers
Admission Control in Self Aware Networks
August 25, 2006, 12:00am PDT
The worldwide growth in broadband access and multimedia traffic has led to an increasing need for Quality-of-Service (QoS) in networks. Real time network applications require a stable, reliable,...
Provided by Imperial College London
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White Papers
A Denial of Service Detector Based on Bayesian Classifiers and the Random Neural Network
April 30, 2007, 12:00am PDT
In spite of extensive research in defense against Denial of Service (DoS), such attacks remain a predominant threat in today's networks. Due to the simplicity of the concept and the availability...
Provided by Imperial College London
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White Papers
Controlling Access to Preserve QoS in a Self-Aware Network
April 12, 2007, 12:00am PDT
Multimedia traffic and real-time applications created a need for network Quality of Service (QoS). This demand led to the development of autonomous networks that use adaptive packet routing in...
Provided by Imperial College London
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White Papers
Routing and G-Networks to Optimise Energy and Quality of Service in Packet Networks
July 23, 2010, 12:00am PDT
The authors formulate the problem of joint energy and Quality of Service (QoS) optimisation in packet networks and show how it can be formalised using the control capabilities inherent in...
Provided by Imperial College London
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White Papers
Energy-Aware Routing in the Cognitive Packet Network
March 17, 2011, 12:00am PDT
An Energy Aware Routing Protocol (EARP) is proposed to minimise a performance metric that combines the total consumed power in the network and the QoS that is specified for the flows. The...
Provided by Imperial College London
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White Papers
Admission of Packet Flows in a Self-Aware Network
July 20, 2007, 12:00am PDT
The demand for stable and reliable networks which can offer packet delivery under Quality of Service constraints led to the development of autonomous networks that use adaptive packet routing in...
Provided by Imperial College London
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White Papers
Oscillations in a Bio-Inspired Routing Algorithm
May 13, 2007, 12:00am PDT
Adaptive routing is once again becoming of interest because of the possibility to couple on-line probing in networks with real-time dynamic and distributed control of paths and flows using the...
Provided by Imperial College London
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White Papers
A Framework for Energy Aware Routing in Packet Networks
January 1, 2009, 12:00am PST
The increasing importance of wired packet networks as the transport substrate on which many communication technologies are converging also increases the importance of making these networks...
Provided by Imperial College London
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White Papers
Self-Healing for Pervasive Computing Systems
February 28, 2010, 12:00am PST
The development of small wireless sensors and smart-phones, which include various sound, video, motion and location sensors have facilitated new pervasive applications. These pervasive systems are...
Provided by Imperial College London
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White Papers
Energy and Time Trade-Offs in Duplicate Packet Transmission
July 13, 2007, 12:00am PDT
Sensor and ad hoc networks are designed to function in uncertain environments. The transmission medium, the possible mobility and unreliability of nodes, and possible malicious interventions by...
Provided by Imperial College London
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White Papers
Quality of Information: An Empirical Approach
July 7, 2008, 12:00am PDT
In this paper the authors examine the Quality of Information (QoI) at the output of a wireless sensor network by considering the difference between the monitored environment and the interpreted...
Provided by Imperial College London
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White Papers
An Overview of Low-Power Techniques for Field-Programmable Gate Arrays
September 14, 2009, 12:00am PDT
This paper provides an overview of low-power techniques for Field-Programmable Gate Arrays (FPGAs). It covers system-level design techniques and device-level design techniques that have targeted...
Provided by Imperial College London
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White Papers
Activity Related Biometrics Based on Motion Trajectories
July 22, 2010, 12:00am PDT
This paper contributes to the concept of activity-related biometric authentication in ambient Intelligence environments. The motivation behind the proposed approach derives from activity-related...
Provided by Imperial College London
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White Papers
Adaptive Random Re-Routing for Differentiated QoS in Sensor Networks
July 23, 2008, 12:00am PDT
Much of the traffic carried by Sensor Networks will originate from routine measurements or observations by sensors which monitor a particular situation, such as the temperature and humidity in a...
Provided by Imperial College London
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White Papers
Cognitive and Self-Healing Routing for Sensor Networks
September 1, 2007, 12:00am PDT
New approaches to Quality-of-Service (QoS) Routing in wireless sensor networks which use different forms of learning are the subject of this paper. The Cognitive Packet Network (CPN) algorithm...
Provided by Imperial College London
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White Papers
Advice for Coordination
March 14, 2008, 12:00am PDT
The authors show how to extend a coordination language with support for aspect oriented programming. The main challenge is how to properly deal with the trapping of actions before the actual data...
Provided by Imperial College London
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White Papers
Enhanced TCP SYN Attack Detection
November 1, 2007, 12:00am PDT
In this paper, the authors analyze the stateless SYN-SYN&ACK and SYN-FIN/RST detection mechanisms for TCP SYN attacks. They indicate the inherent vulnerability of the SYN-FIN/RST detection...
Provided by Imperial College London
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White Papers
On the Study of Cross-Layer Optimization for Wireless Cooperative Networks
April 23, 2007, 12:00am PDT
In this paper, the authors study the effect of cooperative transmission on the routing decision for wireless ad-hoc networks. The influence of cooperative transmission to the wireless link cost is...
Provided by Imperial College London
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White Papers
Abstraction and Refinement for Local Reasoning
June 18, 2010, 12:00am PDT
Local reasoning has become a well-established technique in program verification, which has been shown to be useful at many different levels of abstraction. In separation logic, the authors use a...
Provided by Imperial College London
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White Papers
Towards a Program Logic for JavaScript
January 19, 2012, 12:00am PST
JavaScript has become the most widely used language for client-side web programming. The dynamic nature of JavaScript makes understanding its code notoriously difficult, leading to buggy programs...
Provided by Imperial College London
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White Papers
Queueing Performance Under Network Coding
June 12, 2009, 12:00am PDT
Network Coding (NC) was initially introduced, where its utility for multicast networks was shown. NC allows the algebraic combination of packets at nodes of a multi-hop network, for example by a...
Provided by Imperial College London
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White Papers
A Decentralised, Measurement-Based Admission Control Mechanism for Self-Aware Networks
May 10, 2010, 12:00am PDT
This paper presents a decentralised Admission Control (AC) algorithm. The authors' algorithm is a multiple criteria AC algorithm, where each user can specify the QoS metrics that interest him/her,...
Provided by Imperial College London
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White Papers
Towards Automated Verification of Autonomous Networks: A Case Study in Self-Configuration
January 28, 2010, 12:00am PST
In autonomic networks, the self-configuration of network entities is one of the most desirable properties. In this paper, the authors show how formal verification techniques can verify the...
Provided by Imperial College London
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White Papers
Enforcing User Privacy in Web Applications Using Erlang
April 30, 2010, 12:00am PDT
Social networking applications on the web handle the personal data of a large number of concurrently active users. These applications must comply with complex privacy requirements, while achieving...
Provided by Imperial College London
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White Papers
Multiplicity Computing: A Vision of Software Engineering for Next-Generation Computing Platform Applications
November 8, 2010, 12:00am PST
New technologies have recently emerged to challenge the very nature of computing: multicore processors, virtualized operating systems and networks, and data-center clouds. One can view these...
Provided by Imperial College London
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White Papers
PHP Aspis: Using Partial Taint Tracking to Protect Against Injection Attacks
April 28, 2011, 12:00am PDT
Web applications are increasingly popular victims of security attacks. Injection attacks, such as Cross Site Scripting or SQL Injection, are a persistent problem. Even though developers are aware...
Provided by Imperial College London
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White Papers
Rule-Based Verification of Network Protocol Implementations Using Symbolic Execution
May 15, 2011, 12:00am PDT
The secure and correct implementation of network protocols for resource discovery, device configuration and network management is complex and error-prone. Protocol specifications contain...
Provided by Imperial College London
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White Papers
YA-MAC: Handling Unified Unicast and Broadcast Traffic in Multi-Hop Wireless Sensor Networks
April 25, 2011, 12:00am PDT
This paper introduces YA-MAC, an agile Medium Access Control (MAC) protocol to provide high throughput for both unicast and broadcast traffic in Duty-Cycled Multi-hop Wireless Sensor Networks...
Provided by Imperial College London
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White Papers
Towards a Radio-Controlled Time Synchronized Wireless Sensor Network
September 1, 2010, 12:00am PDT
Wireless sensor networks are deployed to monitor real-world phenomena, and are seeing growing demand in commerce and industry. These networks can benefit from time synchronized clocks on...
Provided by Imperial College London
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White Papers
Presentation Abstract: Remote Elderly Care Monitoring in WASP
March 2, 2010, 12:00am PST
The European project "Wireless Accessible Sensor Populations" (WASP) aims to develop cost-efficient solutions to facilitate WSN deployment and application-driven optimization. This paper addresses...
Provided by Imperial College London
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White Papers
Neighbor Discovery With Activity Monitoring in Multichannel Wireless Mesh Networks
January 4, 2010, 12:00am PST
One way of improving performance of wireless mesh networks is to use multiple non-overlapping channels. At the same time, the mesh network must continuously self-adapt to varying radio conditions...
Provided by Imperial College London
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White Papers
Deconstructing Internet Paths: An Approach for AS-Level Detour Route Discovery
March 24, 2009, 12:00am PDT
Detour paths provide overlay networks with improved performance and resilience. Finding good detour routes with methods that scale to millions of nodes is a challenging problem. The authors...
Provided by Imperial College London
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White Papers
Simple Solutions for the Second Decade of Wireless Sensor Networking
March 5, 2010, 12:00am PST
At 2010, the authors are at the effective end of the first decade of Wireless Sensor Network (WSN) research and that the aspects such as energy efficient routing have pretty much had their day as...
Provided by Imperial College London
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White Papers
On the Design of a Quality-of-Service Driven Routing Protocol for Wireless Cooperative Networks
April 27, 2008, 12:00am PDT
In this paper, a quality-of-service driven routing protocol is proposed for wireless cooperative networks. The key contribution of the proposed protocol is to bring the performance gain of...
Provided by Imperial College London
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White Papers
Link Classification and Residual Time Estimation Through Adaptive Modeling for VANETs
January 26, 2009, 12:00am PST
Vehicular ad hoc networks design has drawn a lot of research attention. High node mobility, an inherent characteristic of VANETs, results in short lived links and rapid topology changes; this...
Provided by Imperial College London
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White Papers
Link Residual-Time Estimation for VANET Cross-Layer Design
April 29, 2009, 12:00am PDT
Traditional network design may underestimate the dependencies between different layers of the protocol stack and fail to exploit the direct coupling of physical-layer operations to the network...
Provided by Imperial College London
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White Papers
Clique-Based Location Estimations for Wireless Sensors in GPS-Free Environments
May 26, 2008, 12:00am PDT
In this paper, the authors present a distributed, self-organizing, localization method for wireless sensors and a scheme for reducing position estimate errors by employing a novel concept of...
Provided by Imperial College London
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White Papers
A Test-Based Scheduling Protocol (TBSP) for Periodic Data Gathering in Wireless Sensor Networks
July 26, 2010, 12:00am PDT
The authors propose TBSP, a TDMA protocol for gathering information periodically from multiple data sources to a central location across multiple hops. TBSP incurs a lower overhead than the...
Provided by Imperial College London
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White Papers
Randomized Scheduling Algorithm for Data Aggregation in Wireless Sensor Networks
February 2, 2010, 12:00am PST
The authors consider a wireless sensor network in which a routing tree has been established to transmit the information from a set of source nodes to a data sink. The existing algorithms to...
Provided by Imperial College London
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White Papers
Preamble Sampling MAC Protocols With Persistent Receivers in Wireless Sensor Networks
March 20, 2009, 12:00am PDT
The authors provide an analytical framework for preamble sampling techniques for MAC protocols in wireless sensor networks, from which they derive closed-form formulas for lifetime and reliability...
Provided by Imperial College London
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White Papers
Energy-Efficient Broadcasts in Wireless Sensor Networks With Multiple Virtual Channels
December 22, 2009, 12:00am PST
Multichannel solutions are increasingly used to cope with the problem of low capacity in sensor networks resulting from high contention during wake-up periods of nodes. The authors can consider...
Provided by Imperial College London
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White Papers
Hierarchical Mobility Control for Data Ferries Under Constrained Message Delays
June 8, 2011, 12:00am PDT
The authors consider the problem of controlling mobile data ferries for message delivery among disconnected, scattered domains in a highly partitioned network. Existing work on data ferry control...
Provided by Imperial College London
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White Papers
Optimal Transmission Probabilities in VANETs With Inhomogeneous Node Distribution
July 28, 2009, 12:00am PDT
In a Vehicular Ad-hoc NETwork (VANET), the amount of interference from neighboring nodes to a communication link is governed by the vehicle density dynamics in vicinity and transmission...
Provided by Imperial College London
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White Papers
Connectivity Dynamics for Vehicular Ad-Hoc Networks in Signalized Road Systems
July 29, 2009, 12:00am PDT
In this paper, the authors analyze the connectivity dynamics of vehicular ad-hoc networks in a generic signalized urban route. Given the velocity profile of an urban route as a function of space...
Provided by Imperial College London
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White Papers
Cooperative Transmit-Power Estimation in MANETs
January 4, 2008, 12:00am PST
Transmit-power estimation is an important part in power-aware designs of Mobile Ad-hoc NETworks (MANETs). In this paper, the authors consider the cooperation among multiple monitor-nodes to...
Provided by Imperial College London
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White Papers
Dynamic Control of Data Ferries Under Partial Observations
January 3, 2010, 12:00am PST
Controlled mobile helper nodes called data ferries have recently been proposed to bridge communications between disconnected nodes in a delay-tolerant manner. While existing work has explored...
Provided by Imperial College London
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White Papers
Cross-Layer Design for QoS in Wireless Mesh Networks
March 15, 2009, 12:00am PDT
Cross-layer design for Quality of Service (QoS) in Wireless Mesh Networks (WMNs) has attracted much research interest recently. Such networks are expected to support various types of applications...
Provided by Imperial College London
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White Papers
An Efficient Cross-Layer Simulation Architecture for Mesh Networks
January 16, 2009, 12:00am PST
Wireless Mesh Networks (WMNs) are emerging as a promising technology for backhauling data traffic from wireless access networks to the wired Internet. Such networks are expected to support various...
Provided by Imperial College London
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White Papers
A Novel Cross-Layer QoS Routing Algorithm for Wireless Mesh Networks
December 7, 2007, 12:00am PST
Wireless Mesh Networks (WMNs) are expected to support various types of applications with different Quality of Service (QoS) requirements. Existing works are limited to layered approaches that...
Provided by Imperial College London
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White Papers
A Distributed Scheduling Algorithm With QoS Provisions in Multi-Hop Wireless Mesh Networks
August 15, 2008, 12:00am PDT
Multi-hop Wireless Mesh Networks (WMNs) are considered a promising technology to backhaul heterogeneous data traffic from wireless access networks to the wired Internet. WMNs are expected to...
Provided by Imperial College London
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White Papers
A Cross-Layer Framework of QoS Routing and Distributed Scheduling for Mesh Networks
February 18, 2008, 12:00am PST
Cross-layer routing and scheduling algorithms design for wireless backhaul mesh network has attracted much research interest recently. The network is expected to support various types of...
Provided by Imperial College London
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