Imperial College London

Latest Content From Imperial College London

Whitepaper: Calibration of a Queueing Model of RAID Systems

by Imperial College LondonJan 01, 2008

A recent queueing-based modelling methodology of RAID systems compared the mean disk access times of the two most common variants, RAID0-1 and RAID5, as well as a multi-RAID system in which they coexist. Accesses to multiple disks occur concurrently for each logical (user) request and complete only when every disk involved has completed. The models therefore needed to estimate the mean value of the maximum of the individual disk response times, each of which is modelled by the waiting time of an M/G/1 queue.

Whitepaper: Innovation Models And Their Application To The Pharmaceuticals Sector

by Imperial College LondonJan 01, 2008

This paper from Imperial College London reviews the innovation process in the biopharmaceutical sector. It identifies a diverse range of models that are used to describe the innovation process and discusses both early partial models, as well as fuller models which reflect more realistically the dynamic innovation process prevailing in the sector. The paper explores the utility and limitations of models used to classify innovation in the sector. In particular, it examines the distinction between ’Radical,’ ’Incremental’ and ’Imitative’ products.

Whitepaper: Flexible Bytecode for Linking in .NET

by Imperial College LondonJan 01, 2008

This paper is published by Imperial College London. The author has designed and implemented a ""flexible"" dynamic linking scheme that binds bytecode as late as possible to the assemblies and classes available in a .NET execution environment. Author also describes the scheme’s integration with the .NET linking infrastructure, review important design decisions and report on experiences with the ""Rotor"" shared source version of .NET.

Whitepaper: Reducing the Network Overheads of .NET Remoting Through Runtime Call Aggregation

by Imperial College LondonJan 01, 2008

This paper published by Imperial College London presents optimizations aimed at reducing the network overheads of .NET remoting applications without requiring the design of specialized remote APIs. These techniques are based on the work of Yeung and Kelly who have implemented similar optimisation for Java?s RMI infrastructure. Initial testing shows that the optimizations author present can result in significant performance gains, especially for application that are not otherwise optimized for remote operation.

Whitepaper: Service Composition in Ontology Enabled Service Oriented Architecture for Pervasive Computing

by Imperial College LondonJan 01, 2008

One important issue in Pervasive Computing is how to assist non-expert users to use devices and even to combine their functionality without explicit goals. This white paper presents an Ontology enabled Service Oriented Architecture (OSOA), which combines interoperability provided by Web services and semantic description provided by Ontologies, to solve this issue. The paper also discusses related issues of applying planning to service composition, and present the ideas to solve these issues.