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SCHOOL OF DISTANCE EDUCATION (SDE)

Prof. Madya Dr. Lok Yian Yian

  Lok 2
 

Prof. Madya Dr. Lok Yian Yian
Telefon                               : 04-6533931
Faks                                    : 04-6576000
Emel                                    : lokyy@usm.my
Scopus Author ID            : 56263014900
Researcher ID                   : B-9311-2011
Google Scholar                 : AAO1sVUAAAAJ
Pemodelan Matematik bendalir dan Pemindahan haba

Profile

Academic Qualifications:

  • Ph.D. (Mathematics) 2008, Universiti Teknologi Malaysia
  • M.Sc. (Mathematics) 2002, Universiti Teknologi Malaysia
  • B.Sc. with Edu. (Hons.) (Mathematics) 1999, Universiti Teknologi Malaysia

Research

Key Research Area: 

Mathematical Modelling of Fluid Mechanics and Heat Transfer

  • Laminar Boundary Layer Flows (Steady and Unsteady Flows)
  • Newtonian and non-Newtonian fluids (Micropolar Fluid, Nanofluid)
  • Convection Flows
  • Stagnation-Point Flows (Orthogonal and Oblique Flows)

Publication

Research Book:

  1. Merkin, J.H., Pop, I., Lok. Y.Y. and Grosan, T. 2021. Similarity Solutions for the Boundary Layer Flow and Heat Transfer of Viscous Fluids, Nanofluids, Porous Media and Micropolar Fluids. New York: Academic Press, Imprint of Elsevier.

Journal Articles (15 selected) :

  1. Merkin, J.H., Lok. Y.Y. and Pop, I. 2021. A Note on Non-Symmetric Flow: Surface Shrinking in Mutually Orthogonal Directions. Meccanica, 56, pp. 1727-1737. (ISI)
  2. Lok, Y.Y., Merkin, J.H. and Pop, I. 2019. Non-Symmetric Flow over a Stretching/Shrinking Surface with Mass Transfer. Mathematical Modelling and Analysis, 24, pp. 617-634. (ISI)
  3. Merkin, J.H., Lok. Y.Y. and Pop, I. 2019. On an Equation Arising in Natural Convection Boundary Layer Flow in a Porous Medium. Zeitschrift für angewandte Mathematik und Physik (ZAMP), 70, 143. (ISI)
  4. Lok, Y.Y., Merkin, J.H. and Pop, I. 2018. Axisymmetric Rotational Stagnation-Point Flow Impinging on a Permeable Stretching/Shrinking Rotating Disk. European Journal of Mechanics/B Fluids, 72, pp. 275-292. (ISI)
  5. Lok, Y.Y., Ishak, A. and Pop, I. 2018. Oblique Stagnation Slip Flow of a Micropolar Fluid Towards a Stretching/Shrinking Surface: A Stability Analysis. Chinese Journal of Physics, 56, pp. 3062-3072. (ISI)
  6. Lok, Y.Y., Merkin J.H. and Pop, I. 2017. Mixed Convection Non-Axisymmetric Hamann Stagnation-Point Flow. Journal of Fluid Mechanics, 812, pp. 418-434. (ISI)
  7. Merkin, J.H., Lok, Y.Y. and Pop, I., 2016. A Note on the Stagnation-Point Flow over a Permeable Shrinking Sheet with Slip Effects. International Communications in Heat and Mass Transfer, 71, pp. 101-107. (ISI)
  8. Lok, Y.Y., Merkin, J.H. and Pop, I., 2015. MHD Oblique Stagnation-Point Flow towards a Stretching/Shrinking Surface. Meccanica, 50, pp. 2949-2961. (ISI)
  9. Lok, Y.Y. and Pop, I., 2014. Stretching or Shrinking Sheet Problem for Unsteady Separated Stagnation-Point Flow. Meccanica, 49, pp. 1479-1492. (ISI) 
  10. Lok. Y.Y., Merkin, J.H. and Pop, I., 2013. Mixed Convection Boundary-Layer Flow Over Vertical Surface Embedded in a Porous Material Subject to a Convective Boundary Condition. Transport in Porous Media, 98, pp. 451-463. (ISI)
  11. Merkin, J.H., Lok. Y.Y. and Pop, I., 2013. Mixed Convection Boundary-Layer Flow on a Vertical Surface in a Porous Medium with a Constant Convective Boundary Condition. Transport in Porous Media, 99, pp. 413-425. (ISI)
  12. Lok, Y.Y., Ishak, A. and Pop, I., 2013. Stagnation-Point Flow and Heat Transfer Towards a Shrinking Sheet with Suction in an Upper Convected Maxwell Fluid, Zeitschrift für Naturforschung A, 68a, pp. 693-700. (ISI)
  13. Lok. Y.Y., Merkin, J.H. and Pop, I., 2012. Mixed Convection Flow near the Axisymmetric Stagnation Point on a Stretching or Shrinking Cylinder. International Journal of Thermal Sciences, 59, pp. 186-194. (ISI)
  14. Ishak, A., Lok, Y.Y. and Pop, I., 2012. Non-Newtonian Power-Law Fluid Flow Past a Shrinking Sheet with Suction, Chemical Engineering Communications, 199, pp. 142-150. (ISI)
  15. Lok, Y.Y. and Pop, I., 2011. Wang’s Shrinking Cylinder Problem with Suction near a Stagnation Point. Physics of Fluids, 23, 083102. (ISI)

Teaching

Current Academic Session

  • JIM 310 – Introductory Numerical Methods
  • JIM 411 – Introductory Analysis
  • JIM 413 – Differential Equations II
  • JIM 590 – Project

Previous Academic Session

  • JIM 101 – Calculus
  • JIM 105 – Basic Mathematics
  • JIM 211 – Advanced Calculus
  • JIM 311 – Vector Analysis

Supervision

Master of Science (Mathematics)
Name of Student: Anis Anisah binti Mahyuddin
Title of Thesis: Mathematical Modelling of Steady Bödewadt Flow and Heat Transfer in Nanofluid and Hybrid Nanofluid
Status: Waiting for Viva Voce

Recognition

A) Awards:

  • Anugerah Perkhidmatan Cemerlang, PPPJJ, USM (2019)
  • Hadiah Sanjungan (Category of Journal Publication), USM (2011, 2017, 2018, 2019)
  • Anugerah Sanggar Sanjung (Category of Journal Publication), USM (2012, 2016)
  • Dean’s Award (for excellent servies), PPPJJ, USM (2011)
  • Anugerah PERSAMA (Main Prize of Category of Ph.D Thesis), PERSAMA (2009)
  • Life member of Persatuan Sains Matematik Malaysia (PERSAMA) (since 2009)
  • European Union Marie Curie Short Term Fellowship, Host: Centre for Computational Fluid Dynamics, School of Process, Environmental and Material Engineering, University of Leeds, U.K. (The Sixth Framework Marie Curie Actions Programme) (2007)
  • Highly Commended Award (Category of Journal Article), Emerald Literati Network (2006)

B) External Examiner for Thesis:

  • Master of Science (Mathematics) – Research – 2018
    Institution: Universiti Teknologi Malaysia
    Name of Student: Koo Meng Lian
    Original Title of Thesis: Mathematical Modelling of Blood Flow in a Catheterized Artery with Time Variant Multiple Stenoses
  • Master of Science (Engineering Mathematics) – Mixed Mode – 2017
    Institution: Universiti Malaysia Perlis
    Name of Student: Nur Athirah binti Azami
    Original Title of Thesis: Boundary Layer Flow and Heat Transfer Over Stretching/Shrinking sheet in a Nanofluid with Slip Effect
  • Master of Science (Engineering Mathematics) – Mixed Mode – 2013
    Institution: Universiti Malaysia Perlis
    Name of Student: Nurul Najwa binti Mansor
    Original Title of Thesis: Stagnation Point Flow and Heat Transfer towards a Stretching Sheet with Suction in a Nanofluid
  • Master of Science (Mathematics) – Research – 2011 
    Institution: Universiti Teknologi Malaysia
    Name of Student: Abdul Rahman Mohd. Kasim
    Original Title of Thesis: Free and Mixed Convection Boundary Layer Flow of Viscoelastics Fluids Past a Horizontal Circular Cylinder

C) Internal Examiner for Thesis:

  • Doctor of Philosophy (Mathematics) – Research – 2021
    Institution: Universiti Sains Malaysia
    Name of Student: Asma Izzati binti Asnor
    Original Title of Thesis: High Order Variable Step Variable Order Block Backward Differentiation Formulae for Solving Higher Order Stiff Ordinary Differential Equations

D) Reviewing Articles in Academic Journals:

  1. Meccanica (Springer)
  2. Physica A (Elsevier)
  3. Boundary Value Problems (Springer)
  4. Journal of the Franklin Institute (Elsevier)
  5. International Journal of Heat and Mass Transfer (Elsevier)
  6. International Journal for Numerical Methods in Fluids (John Wiley & Sons)
  7. Chemical Engineering Communication (Taylor & Francis)
  8. ZAMM - Journal of Applied Mathematics and Mechanics (Wiley-VCH Verlag GmbH)
  9. Nanoscale Research Letters (Springer)
  10. International Journal of Numerical Methods for Heat and Fluid Flow (Emerald)
  11. International Journal of Non-Linear Mechanics (Elsevier)
  12. Mathematical Problems in Engineering (Hindawi Publishing)
  13. Propulsion and Power Research (Elsevier)
  14. Alexandria Engineering Journal (Elsevier)
  15. Ain Shams Engineering Journal (Elsevier)
  16. Microfluidics and Nanofluidics (Springer)
  17. Applied Thermal Engineering (Elsevier)
  18. The European Physical Journal Plus (Springer)
  19. International Journal of Applied and Computational Mathematics (Springer)
  20. Journal of Mechanics (Cambridge University Press)
  21. Zeitschrift für Naturforschung A – Physical Sciences (Walter De Gruyter GmbH)
  22. Thermal Science (Vinča Institute of Nuclear Sciences, Belgrade)
  23. Journal of Science and Technology (UTHM)
  24. Malaysian Journal of Mathematical Sciences (MJMS) (UPM)
  25. Sains Malaysiana (UKM)

E) Service to University:

  • Pengerusi Rancangan Matematik, PPPJJ, USM (2016-2021)
  • Juru Audit, Persatuan Kakitangan Akademik dan Pentadbiran (PKAP), USM (2020-2021)
  • Vice President, Persatuan Kakitangan Akademik dan Pentadbiran (PKAP), USM (2016-2017)
  • Executive Committee Member, Persatuan Kakitangan Akademik dan Pentadbiran (PKAP), USM (2013-2015

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