PERSONAL DETAIL


Associate Prof. Dr. Chooi Wai Leong

Institute of Mathematical Sciences
Faculty of Science
 
  +603-79674332
  +603-79674143
  wlchooi@um.edu.my
  Institute of Mathematical Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, MALAYSIA
 
ResearcherID Link
  http://www.researcherid.com/rid/B-8403-2010


BIBLIOMETRIC DATA


 Total Articles in Publication List  16
 Articles With Citation Data  16
 Sum of the Times Cited   81
 Average Citations per Article   5.06
 h-index   5
 Co-authors   Collaboration Network
 This information is generated from http://researcherid.com

ACADEMIC QUALIFICATION
(Qualification), (Institution).



PROFESSIONAL
(Organisation), (Role), (Year), (Level).


  • INTERNATIONAL LINEAR ALGEBRA SOCIETY (ILAS), Member, 2000 to 2015, (International)
  • Persatuan Matematik Malaysia (PERSAMA), Life Member, 2009, (National)
  • Acta Mathematica Sinica, English Series, Article Reviewer, 2011 to 2011, (International)
  • The Malaysian Journal of Science, Editorial Board Member, 2011 to 2014, (University)
  • AMERICIAN MATHEMATICAL SOCIETY (AMS), Member, 2014 to 2015, (International)
  • LINEAR AND MULTILINEAR ALGEBRA (LAMA) - REVIEWER, Article Reviewer, 2015 to 2015, (International)

ADMINISTRATIVE DUTIES
(Role), (Level), (Start date),(End Date).


  • Auditor Dalaman ISM, Faculty, 01/09/2018 to 01/09/2019
  • Jawatankuasa Ijazah Tinggi ISM, Faculty, 01/09/2018 to 01/09/2019
  • Internal Auditor for "Audit Kendiri Fakulti Sains 2018", Faculty, 21/05/2018 to 25/05/2018 (Internal Auditor for "Audit Kendiri Fakulti Sains 2018" appointed by Dean of Faculty of Science Professor Dr. Zanaria Abdullah for conducting the audit in PT01: Teaching and Learning Aspect.)
  • Scientific Committee Member of the 4th International Statistical Conference 2018 (ISM-IV), National, 25/04/2018 to 03/08/2018 (4th International Statistical Conference 2018 (ISM-IV), Sunway University and Institute Statistics Malaysia, August 1-2, 2018. Sunway University, Malaysia)
  • Jawatankuasa Ijazah Tinggi ISM, Faculty, 01/09/2017 to 01/09/2018
  • Auditor Dalaman ISM, Faculty, 01/09/2017 to 01/09/2018
  • Internal Auditor for 18/2017, University Malaya, 13/02/2017 to 01/06/2017 (The internal audit had been conducted from 25 April 2017 - 19 May 2017 for Bil18/2017. However, the appointment and preparation task force started in Feb 2017.)
  • Deputy Head, Faculty, 01/09/2016 to 13/08/2017 (I am conducting 5 month sabbatical leave staring from 14 August 2017.)
  • Coordinator of the Higher Degree for ISM, Faculty, 01/09/2016 to 13/08/2017 (I am conducting 5 month sabbatical leave starting fron 14 August 2017. )
  • Library Representative for ISM , Faculty, 01/09/2016 to 13/08/2017 (I am conducting sabbatical leave from 14 August 2917 - 13 January 2018 )
  • LIBRARY REPRESENTATIVE FOR THE INSTITUTE OF MATHEMATICAL SCIENCES, FACULTY OF SCIENCE, Faculty, 02/12/2014 to 01/06/2016
  • Jawatankuasa Spesifikasi dan Penilaian Teknikal, University Malaya, 18/11/2011 to 01/03/2012
  • Quality Manager, Faculty, 02/09/2010 to 31/12/2012
  • The Chairman of Seminar Committee of the Institute of Mathematical Sciences, Faculty of Science, Institute of Mathematical Sciences, Faculty of Science, 01/05/2009 to 30/09/2010
  • Internal Auditor of UM, University Malaya, 01/05/2008 to 01/12/2012
  • Library Representative for the Institute of Mathematical Sciences, Faculty of Science., Faculty, 01/01/2008 to 01/12/2014

AREAS OF EXPERTISE
(Area).


  • Linear and Multilinear Algebra (Matrix Theory, Linear Algebra, Multilinear Algebra, Tensor Spaces, Geometry of Matrices, Kronecker Product of Matrices, Functional Identity)


RECENT SELECTED PUBLICATIONS
(Publication).


Chapter in Book

2006
  • W.L. Chooi (2006), Complex numbers and elementary functions, Engineering Mathematics I, 2nd Edition, 237- 286. Pearson Prentice Hall (ISBN:978-983-3655-15-1). 
  • W.L. Chooi (2006), Calclulus of one variable, Engineering Mathematics I, 2nd Edition, 1-220. Pearson Prentice Hall (ISBN:978-983-3655-15-1) 
  • W.L. Chooi (2006), Complex Variables, Engineering Mathematics II, 2nd Edition, 385-652, Pearson Prentice Hall (ISBN:978-983-3655-16-8). 
Article in Academic Journals

2018
  • Chooi, W. L., & Kwa, K. H. (2018). Classical adjoint commuting and determinant preserving linear maps on Kronecker products of Hermitian matrices. Linear and Multilinear Algebra, (ISI-Indexed)
  • Chooi, W. L., & Kwa, K. H. (2018). Additive maps of rank r tensors and symmetric tensors. Linear and Multilinear Algebra. (ISI-Indexed)
  • Chooi, W. L., Kwa, K. H., & Tan, L. Y. (2018). Commuting maps on rank k triangular matrices. Linear and Multilinear Algebra. (ISI-Indexed)

2017
  • Chooi, W. L., Kwa, K. H., & Lim, M. H. (2017). Coherence invariant maps on tensor products. Linear Algebra and its Applications, 516, 24-46. (ISI-Indexed)

2016
  • Chooi, W. L., Kwa, K. H., & Lau, J. ( 2016). A note on classical adjoint commuting linear maps of tensor products of matrices. Linear and Multilinear Algebra, 64(4), 745-766. (ISI-Indexed)

2014
  • Chooi, W.L., & Ng, W.S. (2014). Classical adjoint commuting mappings on alternate matrices and skew-Hermitian matrices. Operators and Matrices, 8(2), 485-512. (ISI-Indexed)
  • Chooi, W. L., Kwa, K. H., Lim, M. H., & Ng, Z. C. (2014). Linear spaces and preservers of bounded rank-two per-symmetric triangular matrices. Electronic Journal of Linear Algebra, 27, 619-651. (ISI-Indexed)

2013
  • Chooi, W.L., Lim, M.H., & Ng, Z.C. (2013). Linear spaces and preservers of symmetric matrices of bounded rank-two. Linear and Multilinear Algebra, 61(8), 1051-1062. (ISI-Indexed)

2011
  • Chooi, W.L. & Ng, W.S. (2011). Classical adjoint-commuting mappings on Hermitian and symmetric matrices. Linear Algebra and its Applications, 435, 202-223. (ISI-Indexed)
  • Chooi, W.L. (2011), Compound-commuting additive maps. J. Korean Math. Soc., 48(1), 83-104. (ISI-Indexed)

2010
  • Chooi, W.L. (2010). Rank-one nonincreasing additive maps between block triangular matrix algebras. Linear and Multilinear Algebra, 58(6), 715-740. (ISI-Indexed)
  • Chooi, W.L., & Ng, W.S. (2010). On classical adjoint-commuting mappings between matrix algebras. Linear Algebra and its Applications, 432, 2589-2599. (ISI-Indexed)

2006
  • Chooi, W .L., & Lim, M. H. (2006), Additive rank-one preservers on block triangular matrix spaces. Linear Algebra and its Applications, 416(2-3), 588-607. (ISI-Indexed)

2005
  • Chooi, W.L., & Lim, M.H. (2005), Additive preservers of rank-additivity on matrix spaces. Linear Algebra and its Applications, 402(1), 291-302. (ISI-Indexed)

2004
  • Chooi, W.L., & Lim, M.H. Lim (2004). Additive preservers of rank-additivity on matrix spaces. Journal of Natural Science of Heilongjiang University, 21(4), 46-49. (Non-ISI/Non-SCOPUS)

2003
  • Chooi, W.L., & Lim, M.H. (2003), Some linear preserver problems on block triangular matrix algebras. Linear Algebra and its Applications, 370(1), 25-39. (ISI-Indexed)
  • Chooi, W.L., Lim, M.H., & Semrl, P. (2003). Adjacency preserving maps on upper triangular matrix algebras. Linear Algebra and its Applications, 367(1), 105-130. (ISI-Indexed)

2002
  • Chooi, W. L., & Lim, M. H. (2002), Coherence invariant mappings on block triangular matrix spaces. Linear Algebra and its Applications, 346(1-3), 199-238. (ISI-Indexed)
  • Chooi, W. L., & Lim, M. H. (2002), Rank-one nonincreasing mappings on triangular matrices and some related preserver problems. Linear and Multilinear Algebra, 49(4), 305-336. (ISI-Indexed)

1998
  • Chooi, W.L., & Lim, M.H. (1998), Linear preservers on triangular matrices. Linear Algebra and its Applications, 269(1-3), 241-255. (ISI-Indexed)
Proceeding

2002
  • W.L. Chooi and M.H. Lim (2002), Rank-one nonincreasing linear maps on block triangular matrix algebras, Proceeding of 10-th National Mathematical Sciences Symposium, 72-78, Johor Baharu, Malaysia. 

1996
  • W.L. Chooi and M.H. Lim (1996), Product preserving linear transformations on matrix spaces, Proceeding of the 7th National Mathematical Sciences Symposium, 312- 318, Kuala Lumpur, Malaysia. 
Extended Abstract

2009
  • W.L. Chooi (2009), Compound-commuting additive maps between square matrix, 5-th IMT-GT International Conference on Mathematics, Statistics and their Applications (ICMSA) 2009, June 9- 11, 2009, West Sumatera, Indonesia. 

2008
  • W.L. Chooi (2008), Rank-one nonincreasing additive maps between block triangular matrix algebars, 8-th International Conference on Matrix Theory and its Applications (ICMTA 2008), July 16-18, 2008, Taiyuan Normal University, China. 
  • W.L. Chooi (2008), Adjugate-commuting additive maps on triangular matrices over an arbitrary field, One Day Seminar in Mathematics UM 2008, July 1, 2008, Institute of Mathematical Sciences, University of Malaya. 

2007
  • W.L. Chooi (2007), Additive rank-one preservers on triangular matrices, Invited talk, 3rd International Mathematics and Physical Sciences Graduate Congress 2007 (MPSGC 2007), December 12-14, 2007, University of Malaya, Malaysia. 
  • W.L. Chooi and M.H. Lim (2007), Additive mappings preserving rank-additivity on block triangular matrix algebras, 3rd IMT-GT Regional Conference on Mathematics, Statistics and Applications (IMT-GT-RCMSA 2007), December 5-6, 2007, Penang, Malaysia. 

2001
  • W.L. Chooi and M.H. Lim (2001), Coherence invariant mappings on block triangular matrices, the 9-th International Linear Algebra Society Conference, June 25-29, 2001, Institute of Advanced Studies in Mathematics, Technion-Israel Institute of Technology, Haifa, Israel. 

2000
  • W.L. Chooi (2000), Compound-commuting linear mappings on matrices, The 7-th SIAM Conference on Applied Linear Algebra, October 23 ¿C 26, 2000, Jane S. McKimmon Conference Center, North Carolina State University, Raleigh, North Carolina. 

1999
  • W.L. Chooi (1999), Adjugate-commuting maps on triangular matrices, The 8-th International Linear Algebra Society Conference, July 19-22, 1999. Escola Tecnica Superior d¿¿Enginyers Industrials, ETSEIB-UPC, Barcelona, Spain. 

AREAS OF RESEARCH
(Project title), (Role), (From)-(Until), (Level), (Source).


  • PRESERVER PROBLEMS ON TENSOR PRODUCTS RELATED TO QUANTUM INFORMATION SCIENCE, Principal Investigator(PI), 2019 - 2020, Fundamental Research Grant Scheme (FRGS), (National)
  • Preserver Problems on Tensor Products related to Quantum Information Sciences, Principal Investigator(PI), 2018 - 2020, Fundamental Research Grant Scheme (FRGS), (International)
  • Some Presever Problems On Tensor Products Related To Functional Idendities, Principal Investigator(PI), 2018 - 2020, RU Geran - Fakulti Program, (National)
  • Some Preserver Problems on Tensor Products related to Functional Identities, Principal Investigator(PI), 2018 - 2020, University Malaya Faculty Research Grant , (National)
  • Preserver Problems On Tensor Product Of Matrices Related To Quantum Information Science., Principal Investigator(PI), 2014 - 2017, Geran Penyelidikan Universiti Malaya (UMRG) - AFR (Frontier Science), (University)
  • Geometry Of Triangular Matrices And Its Applications In Preserver Problems, Principal Investigator(PI), 2013 - 2015, Fundamental Research Grant Scheme (FRGS), (National)
  • Nonlinear Preserver Problems on Matrix and Tensor Spaces, Principal Investigator(PI), 2011 - 2014, Geran Penyelidikan Universiti Malaya (UMRG), (National)
  • GENERAL CLASSICAL ADJOINT-COMMUTING MAPPINGS ON MATRIX SPACES, , 2009 - 2010, Postgraduate Research Grant (PPP) - Research, (National)
  • Additive Preserver Problems on Matrix Spaces and its Applications, Principal Investigator(PI), 2008 - 2011, Fundamental Research Grant Scheme (FRGS), (National)
  • Operators on matrices with invariance of lie products, Principal Investigator(PI), 2008 - 2009, Short Term Research Fund (Vote F)(PJP), (National)
  • Some Studies on Preserver Problems on Triangular Matrices, Principal Investigator(PI), 2007 - 2008, Short Term Research Fund (Vote F)(PJP), (University)
  • Preserver Problems on Spaces of Matrices or Operators and their Applications, Principal Investigator(PI), 2007 - 2009, ScienceFund, (National)
  • SOME STUDIES ON PRESEVER PROBLEMS ON TRIANGULAR MATRICES, Principal Investigator(PI), 2007 - 2008, RU Geran, (National)
  • Linear preserver problems on spaces of matrices or operators, Principal Investigator(PI), 2002 - 2004, IRPA (MOSTI), (National)

CONSULTATION PROJECT/CONSULTANCY
(Project title), (Role), (From)-(Until), (Organisation).


  • Editor of Malaysian Journal of Science, 2011-2011, Malaysian Journal of Science
  • Reviewer, 2011-2011, Acta Sinica Mathematical (English Series), Springer
  • Reviewer, 2011-2011, Linear and Multilinear Algebra
  • Internal Auditor, 2010-2010, QMEC, University of Malaya

AWARDS AND RECOGNITIONS
(Name of Award), (Awarding Institution), (Year Awarded), (Level).


  • Adjunct Associate Professor in School of Mathematical Sciences, Sunway University, Malaysia, Sunway University, Malaysia, 2018, (National)
  • Excellence Service Award, University Malaya, 2015, (University)
  • Seoul Icm2014 Nanum 2014 Travel Grants Award, The International Congress of Mathematician 2014, 2014, (International)
  • Ambassador of The 2014 International Congress of Mathematicians Icm2014, The International Congress of Mathematicians 2014, 2013, (International)
  • Excellence Service Award, University Malaya, 2012, (University)
  • Certificate of Excellent Service, University Malaya, 2011, (University)
  • Sijil Perkhidmatan Cemerlang 2010, University of Malaya, 2011, (University)

PRESENTATIONS
(Title), (Event), (Date Presented), (Organiser), (Level).


PRESENTER
  • Product preserving linear transformations on matrix spaces, The 7-th National Mathematical Sciences Symposium, 1996-12-03 to 1996-12-05, (National)
  • Geometry of triangular matrices, Centro de Estruturas Lineares e Combinotorias CLEC Seminorio, Complexo Interdisciplinar, June 17 2002, University of Lisboa, Portugal. , 2002-06-17 to 2002-06-17, University of Lisboa, Portugal. , (University)
  • Rank-one nonincreasing linear maps on block triangular matrix algebras, The 10-th National Mathematical Sciences Symposium, 2004-12-23 to 2004-12-24, (National)
  • Rank-one preserving additive mappings on triangular matrices, International Workshop on Preserver Problems, May 5 7 2005, University of Hong Kong, Hong Kong. , 2005-05-05 to 2005-05-07, University of Hong Kong, (International)
  • On classical ajoint commuting mapping between matrix algebras, The 16th Conference of the International Linear Algebra Society, 2010-06-21 to 2010-06-25, Internatioal Linear Algebra Society, University of Pisa, (International)
  • Additive maps of rank r tensors, Workshop on Matrix Theory and Graph Theory, 2017-01-24 to 2017-01-24, Institute of Mathematical Sciences, (International)
INVITED SPEAKER
  • Additive mapping persevering rank-additivity on matrix spaces , Invited Speaker, The 6-th International Conference on Matrix Theory and its Applications 2004. , 2004-07-01 to 2004-07-04, (International)
  • Additive rank-one preservers on triangular matrices, Invited Speaker, The 3rd Mathematics and Physical Sciences International Graduates Congress, 2007-12-12 to 2007-12-14, University of Malaya., (International)
  • Classical adjoint commuting mappings on Hermitian and symmetric matrices, The Fifth Workshop on Matrices and Operators, 2010-07-11 to 2010-07-15, Shanxi Association for Science and Technology, Taiyuan University of Technology and Shanxi Normal University, (International)
  • Some studies on the geometry of block triangular matrices, The 6-th International Workshop on Matrices and Operators (MAO2011), 2011-07-08 to 2011-07-11, College of William and Mary (USA) and University of Electronic Science and Technology of China (China), (International)
PLEANARY/KEYNOTE SPEAKER
  • Linear Preserver Problems and their Recent Developments, The 11-th IMT-GT International Conference on Mathematics, Statistics and its Applications 2015, ICMSA2015, 2015-11-23 to 2015-11-25, King Mongkut's Institute of Technology Ladkrabang, (International)
EVENT ORGANISER
  • A characterization of surjective classical adjoint commuting maps on matrix algebras, Seminar in Mathematical Sciences 2009, 2009-10-30 to 2009-11-01, Insitute of Mathematical Sciences, University of Malaya, (National)
ORAL
  • Bounded distance preserving surjective mappings on triangular matrices, International Conference on Rings and Algebas, 2011-07-10 to 2011-07-16, Kent State University (USA), National Taiwan University (Taiwan) and National Cheng Kung University (Taiwan), (International)
  • A note on adjoint preserving mappings on complex Hermitian and skew-Hermitian matrices, Simposium Kebangsaan Sains dan Matematik ke-19, 2011-11-09 to 2011-11-11, Jabatan Sains Komputer dan Matematik, UiTM Pulau Pinang, (National)

EVALUATION ACTIVITIES
(Description), (Evaluation Activity),(Year).


  • As a review panel to review the proceeding papers submitted to the 4th ISM International Statistical Conference 2018 (ISM-IV) for the consideration of publication., Article In Proceeding ,  (2018 - 2018)
  • As a scholar in linear and multilinear algebra, we are invited to review manuscripts (related to linear algebra and matrix theory) submitted to Malaysian Journal of Science for publication., Article In Journal ,  (2006 - 2010)
  • As a scholar in linear and multilinear algebra, we will be invited to review manuscript submitted to Linear Multilinear Algebra for a possible publication., Article In Journal ,  (2001 - 2017)
  • As a scholar in linear and multilinear algebra, we will be invited to review manuscript submitted to Linear Algebra and its Applications for a possible publication., Article In Journal ,  (2000 - 2014)

CONTRIBUTION TO SOCIETY
(Contribution To Society), (Level), (Start Date), (End Date).


  • Ambassador of the 2014 International Congress of Mathematicians (ICM2014) and its Invitition Program NANUM2014, (International), 01/01/2013 until 01/08/2014

SUPERVISION


POST GRADUATE STUDENT
(Name of Degree), (Name of Candidates), (Title of Thesis), (Academic Session)

Completed
  • Master Degree, Lau Jin Ting (sgp130010), Some Linear Preserver Problems on Tensor Products of Matrices, 2013/2014
  • Master Degree, Ng Zhen Chuan (sgp100007), Linear spaces and preservers of persymmetric triangular matrices of bounded rank-two, 2011/2012
  • Doctoral Degree (phd), Ng Wei Shean (shb 080010), GENERALISED CLASSICAL ADJOINT-COMMUTING MAPPINGS ON MATRIX SPACES, 2008/2009

Ongoing
  • Doctoral Degree (phd), Tan Li Yin, Additive Maps of Selected Subsets of Matrices, 2017/2018