4,575 research outputs found
Embedding expert systems in semi-formal domains : examining the boundaries of the knowledge base
This thesis examines the use of expert systems in semi-formal domains. The research identifies the main problems with semi-formal domains and proposes and evaluates a number of different solutions to them. The thesis considers the traditional approach to developing expert systems, which sees domains as being formal, and notes that it continuously faces problems that result from informal features of the problem domain. To circumvent these difficulties experience or other subjective qualities are often used but they are not supported by the traditional approach to design. The thesis examines the formal approach and compares it with a semiformal approach to designing expert systems which is heavily influenced by the socio-technical view of information systems. From this basis it examines a number of problems that limit the construction and use of knowledge bases in semi-formal domains. These limitations arise from the nature of the problem being tackled, in particular problems of natural language communication and tacit knowledge and also from the character of computer technology and the role it plays. The thesis explores the possible mismatch between a human user and the machine and models the various types of confusion that arise. The thesis describes a number of practical solutions to overcome the problems identified. These solutions are implemented in an expert system shell (PESYS), developed as part of the research. The resulting solutions, based on non-linear documents and other software tools that open up the reasoning of the system, support users of expert systems in examining the boundaries of the knowledge base to help them avoid and overcome any confusion that has arisen. In this way users are encouraged to use their own skills and experiences in conjunction with an expert system to successfully exploit this technology in semi-formal domains
The impact of a natural time change on the convergence of the Crank-Nicolson scheme
We first analyse the effect of a square root transformation to the time
variable on the convergence of the Crank-Nicolson scheme when applied to the
solution of the heat equation with Dirac delta function initial conditions. In
the original variables, the scheme is known to diverge as the time step is
reduced with the ratio of the time step to space step held constant and the
value of this ratio controls how fast the divergence occurs. After introducing
the square root of time variable we prove that the numerical scheme for the
transformed partial differential equation now always converges and that the
ratio of the time step to space step controls the order of convergence,
quadratic convergence being achieved for this ratio below a critical value.
Numerical results indicate that the time change used with an appropriate value
of this ratio also results in quadratic convergence for the calculation of the
price, delta and gamma for standard European and American options without the
need for Rannacher start-up steps
Opposition policies on identity cards
ID cards are a key point of difference between the main parties. Both the Liberal Democrats and the Conservatives have pledged to scrap them, while Labour will continue with their plans to introduce them. The LSE Identity Project has been following developments in the UK’s Identity Policy since the early days of the Identity Cards Bill in 2005. Here, Dr Edgar A. Whitley and Dr Gus Hosein from the LSE Identity Project analyse the Labour Party’s manifesto comment on identity cards
How academic research has impact – but not always what the Minister wanted: the story of the LSE Identity Project
The last Labour government policy insisted that henceforward 25 per cent of all government aid to university R & D should be determined by how much ‘impact’ university research has on the economy and public policy. Academics from LSE’s ‘Identity Project’ have been heavily involved in the debates about the now scrapped government identity cards scheme. LSE published a critical report in 2005 only for some of the leading researchers to be singled out for attacks by Labour government ministers. Here Simon Davies, Edgar A. Whitley and Gus Hosein reflect on their experiences and discuss the perils for academic freedom in seeking to influence public policy. A more tolerant and broad-ranging consideration of university research can bring great benefits in building better policies from the outset
How academic research makes impact, but not always in the way the Minister wanted… the story of the LSE Identity Project
The last Labour government policy insisted that henceforward 25 per cent of all government aid to university R & D should be determined by how much ‘impact’ university research has on the economy and public policy. Academics from LSE’s ‘Identity Project’ have been heavily involved in the debates about the now scrapped government identity cards scheme. LSE published a critical report in 2005 only for some of the leading researchers to be singled out for attacks by Labour government ministers. Here Simon Davies, Edgar A. Whitley and Gus Hosein reflect on their experiences and discuss the perils for academic freedom in seeking to influence public policy. A more tolerant and broad-ranging consideration of university research can bring great benefits in building better policies from the outset
Extraction of comprehensible logical rules from neural networks: application of TREPAN in bio and cheminformatics
TECHNOLOGY ADOPTION IN OYSTER PROCESSING: A HACCP STIMULUS?
Research and Development/Tech Change/Emerging Technologies,
Challenges to ethical publishing in the digital era: a journal editor’s response to the limited mind reading skills of academic authors
Purpose
– The purpose of this paper is to respond to Curno
'
s article from the perspective of a journal editor.
Design/methodology/approach
– The paper is analysed and a commentary formulated.
Findings
– A tacit knowledge perspective is developed.
Research limitations/implications
– The perspective is of one editor of a journal published by Emerald.
Originality/value
– Given that the perspective is of a current editor, it provides a distinctive practical insight into some of the issues surrounding academic authorship.
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Written evidence submitted by Dr Edgar A. Whitley, Associate Professor (Reader) in Information Systems, London School of Economics and Political Science. Co–chair Cabinet Office Privacy and Consumer Advisory Group (PCAG) (DEB 69)
Scrapping costly and controversial proposals for identity cards
Dr Edgar Whitley helped persuade the UK coalition government to scrap the controversial identity card scheme soon after taking office
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