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The standard GTM (generative topographic mapping) algorithm assumes that the data on which it is trained consists of independent, identically distributed (i.i.d.) vectors. For time series, however, the i.i.d. assumption is a poor approximation. In this paper we show how the GTM algorithm can be extended to model time series by incorporating it as the… (More)

- Christopher M. Bishop, Iain Strachan, John O'Rourke, Geoff Maddison, Paul Thomas
- Neural Computing & Applications
- 1993

The tokamak is currently the principal magnetic confinement system for controlled fusion research. In seeking to understand the physics of the high temperature plasma inside the tokamak, it is important to have detailed information on the spatial distribution of electron density. One technique for density measurement uses laser interferometry, which gives… (More)

- Iain Strachan, Nicholas P. Hughes, Mustafa H. Poonawala, Jay W. Mason, Lionel Tarassenko
- Annals of noninvasive electrocardiology : the…
- 2009

BACKGROUND
Reliable, automated QT analysis would allow the use of all the ECG data recorded during continuous Holter monitoring, rather than just intermittent 10-second ECGs.
METHODS
BioQT is an automated ECG analysis system based on a Hidden Markov Model, which is trained to segment ECG signals using a database of thousands of annotated waveforms. Each… (More)

- Iain Strachan
- 2009

In this paper we present an algorithm suitable for the condition monitoring of a manufacturing drilling process that will be able to detect tool wear and impending failure. The algorithm is based around a Hidden Markov Model (HMM) [5] which is trained on “normal” data obtained from the early stages of the lifetime of a drill operating under a particular… (More)

- David Wong, Iain Strachan, Milton Park
- 2008

This paper proposes a modification on the Sammon map algorithm for data visualisation. The modification, known as the Sparse Approximated Sammon Stress(SASS), allows mappings to be produced for very large data sets of the order of 10 points. While the technique may be useful in a variety of applications, the results presented here will demonstrate its… (More)

- Jay W. Mason, Fabio Badilini, +5 authors Iain Strachan
- Journal of electrocardiology
- 2016

BACKGROUND
Existence of a relationship between the electrocardiographic QRS interval duration and the diurnally varying heart rate, of consistent sign and magnitude, is controversial and the relationship has not been fully characterized in normal populations.
METHODS AND RESULTS
We analyzed the QRS-RR interval relationship in 884 Holter recordings in 410… (More)

- Iain Strachan
- Nursing RSA = Verpleging RSA
- 1991

This is the User s Guide to the GTM Toolbox a set of Matlab functions and scripts that implements and demonstrates the generative topographic mapping a method for density modelling dimensionality reduction and data visualisation This document gives a brief description of the GTM the content of the toolbox and what is required to use it It describes how to… (More)

The standard GTM (generative topographic mapping) algorithm assumes that the data on which it is trained consists of independent, identically distributed (i.i.d.) vectors. For time series, however, the i.i.d. assumption is a poor approximation. In this paper we show how the GTM algorithm can be extended to model time series by incorporating it as the… (More)

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