Alistair Forbes
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View article: LabMate: A prospectus for types for MATLAB
LabMate: A prospectus for types for MATLAB Open
View article: Preserving model structure and constraints in scientific computing
Preserving model structure and constraints in scientific computing Open
View article: Uncertainty calculations involving spatial correlation in coordinate metrology
Uncertainty calculations involving spatial correlation in coordinate metrology Open
For much of the 20th century, metrological traceability in industrial applications was achieved through the use of gauge blocks and similar hard gauges. With the introduction of new measurement modalities such as the coordinate measuring m…
View article: CMM Influence Factors and Uncertainty Associated with Length Measurement
CMM Influence Factors and Uncertainty Associated with Length Measurement Open
This paper is concerned with coordinate measuring machine (CMM) uncertainty evaluation, in particular, the uncertainties associated with point clouds and distances derived from the point cloud. The uncertainty evaluation approach is model-…
View article: Gaussian processes and sensor network calibration
Gaussian processes and sensor network calibration Open
View article: 100% Hallucination Elimination Using Acurai
100% Hallucination Elimination Using Acurai Open
The issue of hallucinations in large language models (LLMs) remains a critical barrier to the adoption of AI in enterprise and other high-stakes applications. Despite advancements in retrieval-augmented generation (RAG) systems, current st…
View article: The Algorithm of Gu and Eisenstat and D-Optimal Design of Experiments
The Algorithm of Gu and Eisenstat and D-Optimal Design of Experiments Open
This paper addresses the following problem: given m potential observations to determine n parameters, m>n, what is the best choice of n observations. The problem can be formulated as finding the n×n submatrix of the complete m×n observatio…
View article: Determination of uncertainty of coordinate measurements on the basis of the formula for EL,MPE
Determination of uncertainty of coordinate measurements on the basis of the formula for EL,MPE Open
View article: Validation of the sensitivity analysis method of coordinate measurement uncertainty evaluation
Validation of the sensitivity analysis method of coordinate measurement uncertainty evaluation Open
The paper presents the results of the tests carried out to validate a new method for evaluating the uncertainty of coordinate measurements categorised as the Sensitivity Analysis (SA). This method concerns measuring dimensions and geometri…
View article: Sensitivity Analysis for Gaussian-Associated Features
Sensitivity Analysis for Gaussian-Associated Features Open
This paper is concerned with the evaluation of the uncertainties associated with Gaussian-associated features following the GUM methodology. We show how sensitivity matrices necessary for a GUM uncertainty evaluation can be calculated and …
View article: Data provenance, curation and quality in metrology
Data provenance, curation and quality in metrology Open
Data metrology -- the assessment of the quality of data -- particularly in scientific and industrial settings, has emerged as an important requirement for the UK National Physical Laboratory (NPL) and other national metrology institutes. D…
View article: Validation of the Sensitivity Analysis Method of Coordinate Measurement Uncertainty Evaluation
Validation of the Sensitivity Analysis Method of Coordinate Measurement Uncertainty Evaluation Open
View article: Approximate models of CMM behaviour and point cloud uncertainties
Approximate models of CMM behaviour and point cloud uncertainties Open
Coordinate metrology can be thought of as a two-stage process, the first stage using a coordinate measuring system to gather coordinate data – point clouds – related to a workpiece surface, the second extracting a set of parameters or char…
View article: Generation of numerical artefacts incorporating spatially correlated form error
Generation of numerical artefacts incorporating spatially correlated form error Open
View article: Verification of sensitivity analysis method of measurement uncertainty evaluation
Verification of sensitivity analysis method of measurement uncertainty evaluation Open
View article: International development of the SI in FAIR digital data
International development of the SI in FAIR digital data Open
The International Committee for Weights and Measures has recognised the need to provide support for digital representations of the International System of Units (SI) and related metrological concepts, such as traceability and measurement u…
View article: Optimization of sensor distribution using Gaussian processes
Optimization of sensor distribution using Gaussian processes Open
Experiments are undertaken both to test a hypothesis and, as is usually the case in metrology, to estimate the values of quantities. Experimental design is the process of planning the experiment in order to ensure that measurements gathere…
View article: A Bayesian conformity and risk assessment adapted to a form error model
A Bayesian conformity and risk assessment adapted to a form error model Open
View article: Ontology development for measurement process and uncertainty of results
Ontology development for measurement process and uncertainty of results Open
View article: Reconstruction of refractive index maps using photogrammetry
Reconstruction of refractive index maps using photogrammetry Open
Large volume metrology is a key enabler of autonomous precision manufacturing. For component positioning, the optical-based metrology technique of photogrammetry could be used more widely if its accuracy was improved. These positional meas…
View article: UML knowledge model for measurement process including uncertainty of measurement
UML knowledge model for measurement process including uncertainty of measurement Open
Measurement technology has made an enormous progress in the last decade. With the advent of knowledge representation, various object-oriented models for measurement systems have been developed in the past. Most common limitations of all th…
View article: Pointing error compensation of electro-optical detection systems using Gaussian process regression
Pointing error compensation of electro-optical detection systems using Gaussian process regression Open
Pointing accuracy is an important indicator for electro-optical detection systems, as it significantly affects the system performance. However, as a result of misalignment, nonperpendicularity in the manufacturing and assembly processes, a…
View article: SmartCom Digital System of Units (D-SI) Guide for the use of the metadata-format used in metrology for the easy-to-use, safe, harmonised and unambiguous digital transfer of metrological data - Second Edition (SmartCom数字国际单位制(D-SI):促进便捷、安全、协调、明确的计量数据数字化传输的计量元数据格式使用指南-第二版中文版)
SmartCom Digital System of Units (D-SI) Guide for the use of the metadata-format used in metrology for the easy-to-use, safe, harmonised and unambiguous digital transfer of metrological data - Second Edition (SmartCom数字国际单位制(D-SI):促进便捷、安全、协调、明确的计量数据数字化传输的计量元数据格式使用指南-第二版中文版) Open
This guide specifies principles for determining the use of units in digitised communication of machine-readable data. These principles form the basis for all applications that transmit or require measurement data according to the specifica…
View article: A Variational Model Dedicated to Joint Segmentation, Registration, and Atlas Generation for Shape Analysis
A Variational Model Dedicated to Joint Segmentation, Registration, and Atlas Generation for Shape Analysis Open
In medical image analysis, constructing an atlas, i.e. a mean representative of an ensemble of images, is a critical task for practitioners to estimate variability of shapes inside a population, and to characterise and understand how struc…
View article: Robust Uncertainty Quantification for Measurement Problems with Limited Information
Robust Uncertainty Quantification for Measurement Problems with Limited Information Open
View article: Assessing interlaboratory comparison data adjustment procedures
Assessing interlaboratory comparison data adjustment procedures Open
Interlaboratory comparisons (ILCs) are one of the key activities in metrology. Estimates x = ( x 1 ,…, x n ) T of a measurand α along with their associated standard uncertainties u 0 = ( u 0,1 ,…, u 0, n ) T , u 0, j = u 0 ( x j ) are prov…
View article: Uncertainties associated with position, size and shape for point cloud data
Uncertainties associated with position, size and shape for point cloud data Open
In this paper, we show how a variance matrix associated with a point cloud can be decomposed into components that account for uncertainty in position, size and shape. The decomposition is related to how the frame of reference of the point …
View article: Analysis of measurement data subject to additive and multiplicative effects
Analysis of measurement data subject to additive and multiplicative effects Open
Many calibration problems in metrology involve fitting a model to measurement data representing the response of a system. The standard assumption about the measurement system is that the random effects associated with the measurements are …
View article: Posterior distributions, sampling distributions and inter-laboratory comparison data
Posterior distributions, sampling distributions and inter-laboratory comparison data Open
Weighted least-squares estimation methods are often used in the analysis of inter-laboratory comparison data. In classical statistics, least-squares methods can be justified in terms of properties of sampling distributions. However, not al…
View article: Algorithms and software for fitting polynomial functions constrained to pass through the origin
Algorithms and software for fitting polynomial functions constrained to pass through the origin Open
Fitting a polynomial function to data, accounting for uncertainty information associated with that data, is a problem that is commonly encountered in metrology and for which algorithms and software are widely available. For reasons of nume…