A5023932263- Network Traffic and Congestion Control
- Mobile Agent-Based Network Management
- Software-Defined Networks and 5G
- Caching and Content Delivery
- Peer-to-Peer Network Technologies
- Service-Oriented Architecture and Web Services
- Advanced Optical Network Technologies
- Cloud Computing and Resource Management
- Multimedia Communication and Technology
- IPv6, Mobility, Handover, Networks, Security
- Image and Video Quality Assessment
- Multi-Agent Systems and Negotiation
- Internet Traffic Analysis and Secure E-voting
- Telecommunications and Broadcasting Technologies
- Traffic Prediction and Management Techniques
- IoT and Edge/Fog Computing
- Transportation Planning and Optimization
- Semantic Web and Ontologies
- Business Process Modeling and Analysis
- Opportunistic and Delay-Tolerant Networks
- Software System Performance and Reliability
- Transportation and Mobility Innovations
- Algorithms and Data Compression
- Occupational Health and Safety Research
- Art, Technology, and Culture
University College London
2014-2025
UCL Australia
1994-2023
University of Westminster
2023
Northrop Grumman (Germany)
2021
University of Southampton
2017
Rail Safety and Standards Board (United Kingdom)
2015
Ontario College of Art and Design
2013
University of Surrey
2003
Metro Transit
2003
Foundation for Research and Technology Hellas
1995-2002
The focus of research into 5G networks to date has been largely on the required advances in network architectures, technologies, and infrastructures. Less effort put applications services that will make use exploit flexibility built upon concept software-defined networking (SDN) function virtualization (NFV). Media-based are amongst most demanding services, requiring large bandwidths for high audio-visual quality, low-latency interactivity, sufficient infrastructure resources deliver...
As the Internet evolves toward global multiservice network of future, a key consideration is support for services with guaranteed quality service. The proposed differentiated framework seen as technology to achieve this. DiffServ currently concentrates on control/data plane mechanisms QoS, but also recognizes need management aspects through bandwidth broker. In this article we propose model and architectural supporting DiffServ-based end-to-end QoS in Internet, assuming underlying MPLS-based...
Tri-Met, the transit provider in Portland, Oregon, is implementing a new computer-aided bus dispatching system that uses satellite-based global positioning to track vehicle location. It expected will produce improvements service reliability. Presented baseline analysis of reliability on selected routes, focusing running times, headways, and on-time performance. Reliability found vary according route characteristics, direction, time day.
Admission control is a key component for QoS delivery in IP networks because it determines the extent to which network resources are utilized and whether contracted characteristics actually delivered. Unlike most of existing approaches, we adopt holistic view position admission unified architecture, where traffic engineering service management interact different levels abstraction timescale. Distinguishing between subscription invocation epochs, applied logic based on feedback model,...
The dominant application in today's Internet is content streaming, which increasingly relying on caches to meet the stringent conditions latency between servers and end-users. These systems routinely face challenges of limited bandwidth capacities network server failures, degrade caching performance. In this paper, we study problem optimally allocating over a resilient network, each cache may fail under some situations. Given request rates multiple routing paths, formulate an optimization...
Although direct reciprocity (Tit-for-Tai) contribution systems have been successful in reducing freeloading peer- to-peer overlays, it has shown that, unless the network is dense, they tend to be slow (or may even fail) converge. On other hand, current indirect mechanisms based on reputation susceptible sybil attacks, peer slander and whitewashing. In this paper we present PledgeRoute, an accounting mechanism for contributions that social capital. This allows peers contribute resources one...
This article presents an architecture for supporting interdomain QoS across the multi-provider global Internet. While most research to date has focused on within a single administrative domain, mature solutions are not yet available provision of multiple domains administered by different organizations. The described in this encompasses full set functions required management (service and resource), control data planes end-to-end QoS-based IP connectivity services. We use concept classes show...
Recent advances in media capture and processing technologies have enabled new forms of true 3-D content that increase the degree user immersion. The demand for more engaging entertainment means distributors broadcasters need to fine-tune their delivery mechanisms over Internet as well develop models quantifying predicting experience these content. In work described this paper, we undertake one first studies into quality (QoE) real-time streamed virtual reality (VR) headsets purposes, context...
In this work, we propose a Deep Learning (DL) based solution to the problem of routing traffic flows in computer networks. Routing decisions can be made different ways depending on desired objective and, that function, optimal solutions computed using variety techniques, e.g. with mixed integer linear programming. However, determining these requires solving complex optimization problems thus, cannot typically done at runtime. Instead, heuristics for are often created but designing them is...
Tri-Met has implemented an automated bus dispatching system (BDS) employing satellite-based automatic vehicle location (AVL) technology. The BDS is capable of facilitating real-time operations control actions to improve service regularity. This article focuses on a regularity problem that often occurs during peak periods when regular augmented by extra-board trips ("trippers"). In this case, "bus bunching" results experience departure delays while trippers depart schedule. With the aid...
This article presents a technology-agnostic and multi-dimensional (i.e., routing, forwarding, traffic management dimensions) approach for the of IP network resources to ensure service differentiation with both intra- inter-domain scope. introduces plane (NP) parallel Internets (PI) concepts achieving differentiation. Based on these concepts, functional architecture together business model is presented. In addition, this describes how proposed can become promising platform multimedia...
This article presents an approach to delivering qualitative end-to-end quality of service (QoS) guarantees across the multiprovider Internet.We propose that bilateral agreements between a number autonomous systems (ASs) result in establishment QoS-class planes potentially extend global Internet.The deployment QoS-enhanced Border Gateway Protocol (BGP) with different QoSbased route selection policies each allows range interdomain QoS capabilities coexist on same network infrastructure.The...
Cloud computing has revolutionized service delivery by providing on-demand invocation and elasticity. To reap these benefits, computation been displaced from client devices into data centers. This partial centralization is undesirable for applications that have stringent locality requirements, e.g., low latency. problem could be addressed with large numbers of smaller cloud resources closer to users. However, as diffuses within centers the network, there will a need resource allocation...
Findings from a study assessing the accuracy and precision of automatic passenger counter (APC) technology at Tri-County Metropolitan Transportation District Oregon (Tri-Met) are presented. Video surveillance cameras, rather than ride checkers, were used to establish reference values for determining APC precision. Analysis data collection, processing, reporting methods Tri-Met indicates that data, along with properly designed sampling plan, can be internal monthly ridership annual national...
As the Internet evolves, a key consideration is support for services with guaranteed quality of service (QoS). The proposed differentiated (DiffServ) framework, which supports aggregate traffic classes, seen as technology to achieve this. DiffServ currently concentrates on control/data plane mechanisms QoS but also recognises need management aspects through bandwidth broker (BB). In this paper we propose model and architectural framework supporting end-to-end in combination both aspects....
When designing distributed systems and Internet protocols, designers can benefit from statistical models of the that be used to estimate their performance. However, it is frequently impossible for these include every property interest. In cases, model builders have select a reduced subset network properties, rest will estimated those available. this paper we present technique analysis round trip times (RTT) its relationship with other geographic properties. This applied on novel dataset...
RSSB and the University of Southampton's GeoData Institute have collaborated to research develop a toolkit for managing large volumes rail risk data. The pilot system encompasses concepts highly complex geospatial ‘big data’, open standards, source development tools methodologies, enables stakeholders filter, analyse visualise across network, range models. These include train derailments, suicides passenger slip, trips falls, feature wide spatially dependent parameters that affect causal,...
This paper is focused on techniques for maximizing utility across all users within a total network transit cost budget. We present new method selecting between replicated servers distributed over the Internet. First, we introduce novel framework that factors in quality of service metrics. Then design an optimization algorithm, solvable polynomial time, to allocate user requests based while satisfying constraints, mapping names instance locators. then describe efficient, low overhead model...