Professor Alistair Duffy

Job: Professor of Electromagnetics, Associate Dean of Research and Innovation

Faculty: Technology

School/department: School of Engineering and Sustainable Development

Research group(s): Advanced Manufacturing Processes and Mechatronics Centre (AMPMC), Centre for Electronic and Communications Engineering (CECE)

Address: De Montfort University, The Gateway, Leicester, LE1 9BH UK

T: +44 (0)116 257 7056

E: apd@dmu.ac.uk

W: www.dmu.ac.uk

 

Personal profile

Alistair Duffy is Professor of Electromagnetics, and Associate Dean of Research and Innovation in the Faculty of Technology at De Montfort University, Leicester, UK. He received the Bachelor’s degree in Electrical and Electronic Engineering and an MEng degree from University College, Cardiff, UK, in 1988 and 1989, respectively. After receiving the Master’s degree, he joined the research group of Professors Christopoulos and Benson at Nottingham University. There he worked on experimental validation of numerical modeling and received his PhD in 1993. Dr Duffy completed his professional education in 2004 with an MBA from Open University, UK. He is widely published, with over 200 technical papers and articles, mostly on his research interests of validation of computational electromagnetics; physical layer components, particularly communications cabling, and electromagnetic compatibility testing. 

Dr Duffy has contributed to many successful conferences through refereeing functions or organising committee responsibilities. He currently serves on the Board of Directors of the International Wire and Cable Symposium, which attracts approximately 1,000 delegates annually. He is an Associate Editor for the IEEE Transactions on EMC and an Associate Editor of the ACES Journal. Other professional activities include standards body work in the UK (British Standards Institute) and in the IEEE, where he is currently Chair of the EMC Society's Standards Development and Education Committee (SDECom). He is also the Society’s Global EMC Symposium Coordinator. From 2008 to 2009 he served the IEEE EMC Society as a Distinguished Lecturer. In 2015, Dr Duffy was elected to the grade of IEEE Fellow for the development of validation methods in computational electromagnetics.

Dr Duffy was a Series Editor for undergraduate textbooks published by Butterworth-Heinemann (now part of Elsevier) and SciTech Publishing (now part of the IET) on EMC. He has supervised 20 PhD students during his career.

Publications and outputs 

  • Infra-Red Thermal Measurement on a Low Power Infra-Red Emitter in CMOS Technology
    Infra-Red Thermal Measurement on a Low Power Infra-Red Emitter in CMOS Technology Pandey, P.; Oxley, C.; Hopper, Richard; Ali, Z.; Duffy, A. P. This paper presents high temperature characterisation of a novel infra-red (IR) emitter chip based on CMOS technology, using IR thermal microscopy. The performance and reliability of the thermal source is highly dependent on the operating temperature and temperature uniformity across the micro-heater which is embedded within the silicon dioxide membrane. To date, the accuracy of the IR measurement has been limited by the optical transparency of the semiconductor material forming the membrane, which has poor emissivity compared to a black-body source. In this paper, a high emissivity micro-particle sensor is used improve the accuracy of the temperature measurements. IR measurements on the emitter chip were validated with reference to temperature measurements made using an electrical technique where good temperature uniformity across the membrane heater was found. The file attached to this record is the author's final peer reviewed version.
  • Selection of Dominant Characteristic Modes
    Selection of Dominant Characteristic Modes Ghosal, Sandip; De, Arijit; Duffy, A. P.; Chakrabarty, Ajay The theory of characteristic modes is a popular physics based deterministic approach which has found several recent applications in the fields of radiator design, electromagnetic interference modelling and radiated emission analysis. The modal theory is based on the approximation of the total induced current in an electromagnetic structure in terms of a weighted sum of multiple characteristic current modes. The resultant outgoing field is also a weighted summation of the characteristic field patterns. Henceforth, a proper modal measure is an essential requirement to identify the modes which play a dominant role for a frequency of interest. The existing literature of significance measures restricts itself for ideal lossless structures only. This paper explores the pros and cons of the existing measures and correspondingly suggests suitable alternatives for both radiating and scattering applications. An example is presented in order to illustrate the proposed modal method for approximating the shielding response of a slotted geometry. The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.
  • Measuring the shielding properties of flexible or rigid enclosures for portable electronics
    Measuring the shielding properties of flexible or rigid enclosures for portable electronics Duffy, A. P.; Arihilam, E.; Sasse, Hugh G.; Parker, Sarah; Armstrong, R.; Wainwright, N.; Steggles, S.; Thomas, T. Heaviside, in volume 1 of Electromagnetic theory, considered shielding of conducting materials in the form of attenuation. This treatment is still significant in the understanding of shielding effectiveness. He also considered propagation of electromagnetic waves in free-space. What Heaviside (1850–1925) could never have imagined is that 125 years later, there would be devices we know as mobile phones (or cell phones, handies, etc.) with capabilities beyond the dreams of the great science fiction writers of the day like H. G. Wells (1866–1949) or Jules Verne (1828–1905). More than this, that there would be a need for law enforcement agencies, among others, to use electromagnetically shielded enclosures to protect electronic equipment from communicating with the ‘outside world’. Nevertheless, Heaviside’s work is still fundamental to the developments discussed here. This paper provides a review of Heaviside’s view of shielding and propagation provided in volume 1 of Electromagnetic theory and develops that to the design of new experiments to test the shielding of these portable enclosures in a mode-stirred reverberation chamber, a test environment that relies entirely on reflections from conducting surfaces for its operation. The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.
  • Review of the Feature Selective Validation Method (FSV). Part II - Performance Analysis and Research Fronts
    Review of the Feature Selective Validation Method (FSV). Part II - Performance Analysis and Research Fronts Orlandi, Antonio; Duffy, A. P.; Zhang, Gang After the inclusion of the Feature Selective Validation method into the IEEE Std. 1597.1/2, more and more attention has been paid to performance evaluation and enhancements of this technique as well as broadening of applications. This paper reviews the progresses in these domains by first considering the body of work and the virtual team that is responsible for the method development, and offers conclusions about the validity, the correct implementation and further applications of the Feature Selective Validation technique in other domains besides the classic computational electromagnetics and electromagnetic compatibility. The file attached to this record is the author's final peer reviewed version.
  • Review of the Feature Selective Validation Method (FSV). Part I - Theory
    Review of the Feature Selective Validation Method (FSV). Part I - Theory Duffy, A. P.; Orlandi, Antonio; Zhang, Gang It had been just over a decade since the Feature Selective Validation method was proposed in the. As an automated validation method recommended by the IEEE Standard 1597.1/2, the FSV method has gained broad attention in the practice of computational electromagnetics modeling and simulations. This paper reviews the motivation, evolution, enhancements, and criticisms of the method over this time. This aims of this paper are to give a detailed contextualization of the development of the FSV method itself and to discuss the open questions and possible strategies of next generation of automated validation methods. The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.
  • Using Image Quality Assessment (IQA) Databases to Provide an Appraisal of the Ability of the Feature Selective Validation Method (FSV) to Compare 2-dimensional Datasets
    Using Image Quality Assessment (IQA) Databases to Provide an Appraisal of the Ability of the Feature Selective Validation Method (FSV) to Compare 2-dimensional Datasets Zhang, Gang; Orlandi, Antonio; Duffy, A. P. This paper investigates the strengths and drawbacks of the recently developed FSV-2D method. Considering that a subjective benchmark for the validation of 2-dimensional computational electromagnetics data is not available, five datasets with subjective scores, commonly used in image quality assessment, are used. It is found that the FSV-2D prediction is influenced by image type and distortion type. Encouraged by the assessment results, eight parameters of the FSV-2D method are optimized by use of genetic algorithms. It is shown that the optimized FSV-2D method provides better correlation with subjective scores. Good agreement with theoretical analysis for computational electromagnetic data further validates the proposed approach. The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.
  • A Dimension-reduced Sparse Grid Strategy for Stochastic Collocation Method in EMC Software
    A Dimension-reduced Sparse Grid Strategy for Stochastic Collocation Method in EMC Software Bai, Jinjun; Zhang, Gang; Duffy, A. P.; Wang, Lixin Stochastic Collocation Method (SCM), a prevailing uncertainty analysis method, has been successfully implemented in Electromagnetic Compatibility (EMC) simulation, especially in EMC commercial software. However, the “curse of dimensionality” problem (dimensionality means the number of uncertain variables) limits the application of the SCM. This paper proposes a novel sparse grid strategy in order to improve the computational efficiency of the SCM, especially in high dimensionality case. In the proposed strategy, it is revealed that the number of the collocation points is in proportion to the dimensionality. By simulating two shielding effectiveness analysis examples in CST software, the feasibility of the proposed method can be presented clearly, with the help of the Feature Selective Validation method. The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.
  • Statistical Figures of Merit for the Feature Selective Validation Method
    Statistical Figures of Merit for the Feature Selective Validation Method Zhang, Gang; Duffy, A. P.; Orlandi, A. This paper presents point-by-point Feature Selective Validation (FSV) data as a continuous distribution function, rather than in the more usual confidence histogram form, and from that derives the mean, standard deviation, skewness and kurtosis. The increased information that this offers is shown by presenting again the data from three previous exercises to verify FSV performance against visual assessment but including the standard deviation, where it is demonstrated that more robust conclusions about FSV overall assessment can be provided. The implication of the use of statistical data within FSV for including uncertainty in data comparisons is discussed. The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.
  • Standalone closed-form formula for the throughput rate of asynchronous normally distributed serial flow lines
    Standalone closed-form formula for the throughput rate of asynchronous normally distributed serial flow lines Aboutaleb, Adam; Kang, Parminder Singh; Hamzaoui, Raouf; Duffy, A. P. Flexible flow lines use flexible entities to generate multiple product variants using the same serial routing. Evaluative analytical models for the throughput rate of asynchronous serial flow lines were mainly developed for the Markovian case where processing times, arrival rates, failure rates and setup times follow deterministic, exponential or phase-type distributions. Models for non-Markovian processes are non-standalone and were obtained by extending the exponential case. This limits the suitability of existing models for real-world human-dependent flow lines, which are typically represented by a normal distribution. We exploit data mining and simulation modelling to derive a standalone closed-form formula for the throughput rate of normally distributed asynchronous human-dependent serial flow lines. Our formula gave steady results that are more accurate than those obtained with existing models across a wide range of discrete data sets. The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.
  • Transmission Line Matrix (TLM) simulation of the propagation of partial discharge phenomenon in transmission lines
    Transmission Line Matrix (TLM) simulation of the propagation of partial discharge phenomenon in transmission lines Duffy, A. P.; Sasse, Hugh G.; Li, Jianying Partial discharge phenomena impact directly on the performance of cable dielectrics. Good quality simulation tools allow investigation of the causes and effects of these events. This paper describes the development of a transmission line matrix (TLM) based tool along with initial results. The potential benefits of this approach allow detailed analysis of propagation on complex transmission lines along with the opportunity to embed detailed full wave or Multiphysics simulations of the site of the partial discharge event. Further, a time domain approach can also be used for time reversal studies, allowing the source and nature of a partial discharge to be determined from the measured data. While many of these are the subject of ongoing research, they are discussed: setting the agenda for TLM analysis of partial discharge propagation. The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link.


Click here to view a full listing of Alistair Duffy's publications and outputs.

Research interests/expertise

  • Validation of computational electromagnetics. The Feature Selective Valdiation (FSV) method is a product of this research.
  • Communications systems physical layer, particularly communications cabling and antennas.
  • Computational electromagnetics.
  • Electromagnetic measurements, particularly involving the reverberation chamber.
  • Technology strategy, particularly forecasting. 

Courses taught

ENGD2009 Electromagnetics
ENGT5254 Electromagnetic Compatibility
ENGD3011 Electronic and mechanical systems
ENGD2021 Product Introduction and Project Management 

Honours and awards

Honorary member of the Romanian EMC (Electromagnetic Compatibility) Society

Membership of external committees

IEEE EMC Society Board of Directors
IEEE EMC Society Standards Education and Training Committee (Chair)
IWCS Board of Directors
BSi TCT7/-/1 member

Membership of professional associations and societies

Fellow of the IET
Senior Member of the IEEE

Professional licences and certificates

Chartered Engineer

Consultancy work

Data comparison and validation
Structured cabling
EMC testing

Current research students

Currently first supervisor to:

Ahmed Aldabbagh
Hassan fadel
Sabir Hussain
Riyadh Mansoor

Second Supervisor to:

Haitham Adarbah
Clive Collins
Bernd Lehmanski
Mohamed Maricar
Andrew Nicholson

Professional esteem indicators

Associate Editor for the IEEE Transactions on EMC
Editor in Chief for the Applied Computational Electromagnetics Society Newsletter
Series Editor for the IET/SciTech Publishing Series on EMC

Alistair Duffy 051216

Search Who's Who

 

 
News target area image
News

DMU is a dynamic university, read about what we have been up to in our latest news section.

Events target area image
Events

At DMU there is always something to do or see, check out our events for yourself.

Mission and vision target area image
Mission and vision

Read about our mission and vision and how these create a supportive and exciting learning environment.