Sarah Greenfield

Centre for Computational Intelligence (CCI),
DMU Interdisciplinary Group in Intelligent Transport Systems (DIGITS),
Faculty of Technology,
De Montfort University.

Gateway House 6.63
The Gateway
Leicester LE1 9BH

E-mail: s.greenfield@dmu.ac.uk

Last modified

Dr Sarah Greenfield is a Senior Lecturer in the Centre for Computational Intelligence - School of Computer Science and Informatics - Faculty of Computing, Engineering and Media - De Montfort University

Sarah Greenfield received the BA in Mathematics and Philosophy from London University in 1978. In 2005 she was awarded a distinction in the MSc IT degree from De Montfort University, Leicester, UK, and in 2012 a PhD at De Montfort's Centre for Computational Intelligence, working under the supervision of Prof Chiclana. Her enduring interest in logic and the philosophy of mathematics was reflected in her original choice of degree subject. Her MSc project was in the field of defuzzification in type-2 fuzzy logic; her PhD studies continued this theme. Her post-doctoral research has covered mathematical and philosophical aspects of type-2 fuzzy logic, complex fuzzy logic, and fuzzy uncertainty modelling. Type-2 defuzzification remains the main emphasis of her research.

Research Activities

• I organised/chaired a special session in the international conference IFSA-EUSFLAT 2009.
• I act as reviewer for the following international journals:
• IEEE Transactions on Fuzzy Systems
• Information Sciences
• Applied Soft Computing
• International Journal of Approximate Reasoning
• IEEE Transactions on Intelligent Transportation Systems
• Fuzzy Sets and Systems
• Journal of Intelligent & Fuzzy Systems
• IEEE Transactions on Systems, Man, and Cybernetics: Systems
• Neural Computing and Applications
• Soft Computing

Publication Information

• I have a total of 27 peer reviewed publications:
• 9 international journal publications,
• Sarah Greenfield and Francisco Chiclana (2018) Type-Reduced Set structure and the truncated type-2 fuzzy set. Fuzzy Sets and Systems volume 352, pages 119-141. DOI: http://dx.doi.org/10.1016/j.fss.2018.02.012.
• Sarah Greenfield and Francisco Chiclana (2018) The Collapsing Defuzzifier for discretised generalised type-2 fuzzy sets. The International Journal of Approximate Reasoning volume 102, pages 21-40. DOI: http://dx.doi.org/10.1016/j.ijar.2018.07.008.
• Sarah Greenfield (2018) Geometric Defuzzification revisited. Information Sciences volume 466, pages 220-235. DOI: http://dx.doi.org/10.1016/j.ins.2018.07.019.
• Sarah Greenfield and Francisco Chiclana (2015) Fuzzy in 3–D: Two Contrasting Paradigms. Archives for the Philosophy and History of Soft Computing volume 2. URI: http://hdl.handle.net/2086/11483; ISSN: 23410183.
• Sarah Greenfield and Francisco Chiclana (2013) Defuzzification of the Discretised Generalised Type-2 Fuzzy Set: Experimental Evaluation. Information Sciences volume 244, pages 1-25. DOI: http://dx.doi.org/10.1016/j.ins.2013.04.032.
• Sarah Greenfield and Francisco Chiclana (2013) Accuracy and complexity evaluation of defuzzification strategies for the discretised interval type-2 fuzzy set. The International Journal of Approximate Reasoning volume 54, issue 8, pages 1013-1033. DOI: http://dx.doi.org/10.1016/j.ijar.2013.04.013.
• Sarah Greenfield, Francisco Chiclana, Robert I. John and Simon Coupland (April 2012) The Sampling Method of Defuzzification for Type-2 Fuzzy Sets: Experimental Evaluation. Information Sciences volume 189, pages 77-92. DOI: http://dx.doi.org/10.1016/j.ins.2011.11.042.
• Sarah Greenfield and Francisco Chiclana (2011) Type-Reduction of the Discretised Interval Type-2 Fuzzy Set: Approaching the Continuous Case through Progressively Finer Discretisation. Journal of Artificial Intelligence and Soft Computing Research volume 1, issue 3, pages 183-193; ISSN: 2083-2567.
• Sarah Greenfield, Francisco Chiclana, Simon Coupland and Robert I. John (June 2009) The Collapsing Method of Defuzzification for Discretised Interval Type-2 Fuzzy Sets. Information Sciences volume 179, issue 13, pages 2055-2069. DOI: http://dx.doi.org/10.1016/j.ins.2008.07.011.
• 1 book chapter, and
• Sarah Greenfield and Robert I. John (2009), "The Uncertainty Associated with a Type-2 Fuzzy Set", chapter in Views on Fuzzy Sets and Systems from Different Perspectives, edited Rudolf Seising, in "Studies in Fuzziness and Soft Computing", series editor Janusz Kacprzyk, Springer Verlag, pages 471-483. DOI: 10.1007/978-3-540-93802-6 23; ISSN: 1434-9922; ISBN: 978-3-540-93801-9.
• 17 conference / symposium / colloquium publications.
• Sarah Greenfield, Francisco Chiclana and Scott Dick, "Join and Meet Operations for Interval-Valued Complex Fuzzy Logic", in Proc NAFIPS 2016, El Paso, Texas, Canada, October 2016.
• Sarah Greenfield, Francisco Chiclana and Scott Dick, "Interval-Valued Complex Fuzzy Logic", in Proc. WCCI 2016, Vancouver, Canada, July 2016.
• Sarah Greenfield, "Uncertainty Measurement for the Interval Type-2 Fuzzy Set", in Proc. ICAISC 2016, Zakopane, Poland, June 2016, pages 183-194.
• Sarah Greenfield and Francisco Chiclana, "Slicing Strategies for the Generalised Type-2 Mamdani Fuzzy Inferencing System", in Proc. ICAISC 2016, Zakopane, Poland, June 2016, pages 195-205.
• Sarah Greenfield, "Travels with My App: Computational Intelligence for Individualised Dynamic Rail Journey Planning", presentation for the Research Spotlight Competition of the London Hopper Colloquium, May 2014.
• Sarah Greenfield and Francisco Chiclana, "The Structure of the Type-Reduced Set of a Continuous Type-2 Fuzzy Set", in Proc. EUSFLAT 2013, Milan, Italy, September 2013 (Advances in Intelligent Systems Research, Atlantis Press). DOI: http://dx.doi.org/10.2991/eusflat.2013.102; ISSN: 1951-6851; ISBN: 978-90786-77-78-9.
• Sarah Greenfield and Francisco Chiclana, "Fuzzy in 3-D: Contrasting Complex Fuzzy Sets with Type-2 Fuzzy Sets", in Proc. IFSA/NAFIPS 2013, Edmonton, Canada, June 2013, pages 1237-1242.
• Sarah Greenfield, "The Grid Method of Discretisation for Type-2 Fuzzy Sets", Studies in Mathematical and Computer Sciences: Proc. UKCI 2012, Edinburgh, September 2012.
• Sarah Greenfield and Francisco Chiclana, "Combining the α-Plane Representation with an Interval Defuzzification Method", in Proc. EUSFLAT-LFA 2011, Aix-Les-Bains, France, July 2011.
• Sarah Greenfield and Francisco Chiclana, "Type-Reduction of the Discretised Interval Type-2 Fuzzy Set: What Happens as Discretisation Becomes Finer?", in Proc. SSCI 2011, Paris, April 2011, pages 102-109.
• Sarah Greenfield, Francisco Chiclana, Simon Coupland and Robert I. John, "Type-2 Defuzzification: Two Contrasting Approaches", in Proc. FUZZ-IEEE 2010, Barcelona, July 2010, pages 3183-3189.
• Sarah Greenfield, Francisco Chiclana and Robert I. John, "Type-Reduction of the Discretised Interval Type-2 Fuzzy Set", in Proc. FUZZ-IEEE 2009, Jeju Island, Korea, August 2009.
• Sarah Greenfield, Francisco Chiclana and Robert I. John, "The Collapsing Method: Does the Direction of Collapse Affect Accuracy?", in Proc. IFSA-EUSFLAT 2009, Lisbon, July 2009, pages 980-985.
• Sarah Greenfield and Robert I. John, "Stratification in the Type-Reduced Set and the Generalised Karnik-Mendel Iterative Procedure", in Proc. Intelligent Processing and the Management of Uncertainty 2008 - IPMU 2008, Malaga, June 2008, pages 1282-1289.
• Sarah Greenfield, Francisco Chiclana, Robert I. John and Simon Coupland, "The Collapsing Method of Defuzzification for Discretised Interval Type-2 Fuzzy Sets", in Proc. UKCI 2007, London, July 2007.
• Sarah Greenfield and Robert I. John, "Optimised Generalised Type-2 Join and Meet Operations", in Proc. FUZZ-IEEE 2007, London, July 2007, pages 141-146.
• Sarah Greenfield, Robert I. John and Simon Coupland, "A Novel Sampling Method for Type-2 Defuzzification", in Proc. UKCI 2005, London, September 2005, pages 120-127.
• PhD Thesis:
Sarah Greenfield, "Type-2 Fuzzy Logic: Circumventing the Defuzzification Bottleneck", PhD thesis, De Montfort University, 2012.
• Technical Report:
Sarah Greenfield, "Fuzzy Photo Project", Technical Report, De Montfort University, September 2010.

Awards

• In 2010 I was the recipient of two awards:
• Finalist in the Anita Borg Scholarships 2010.
• Third prize (£2000) in DMU's Creative Thinking Awards 2010, for the Greenfield-Chiclana Collapsing Defuzzifier.

Matlab Code for Type-2 Defuzzification

Click here to access the Matlab files used in the experiments in "Type-2 Defuzzification: Two Contrasting Approaches", FUZZ-IEEE 2010. The test sets used in these experiments are available here.

Click here to access the Matlab files used in the experiments in "Type-Reduction of the Discretised Interval Type-2 Fuzzy Set: What Happens as Discretisation Becomes Finer?", SSCI 2011. The test sets used in these experiments are available here.

Click here to access the Matlab files used in the experiments in "Combining the α-Plane Representation with an Interval Defuzzification Method", EUSFLAT-LFA 2011. The test sets used in these experiments are available here.

Click here to access the Matlab files used in the experiments in "The Collapsing Defuzzifier for discretised generalised type-2 fuzzy sets", Information Sciences 2018. The test sets used in these experiments are available here.