PROFILE

UPM's Staff Profile

YBHG. PROFESOR DR. LEONG WAH JUNE

PROFESSOR

FACULTY OF SCIENCE

leongwj@upm.edu.my

PROFESSIONAL

UPM WEBSITE

PROFILE

leongwj

PROFESSIONAL

NAME :

(Ybhg. Profesor Dr.) LEONG WAH JUNE

POST :

PROFESSOR

ENTITY :

FACULTY OF SCIENCE

FIELD OF SUPERVISION

APPLIED AND COMPUTATIONAL STATISTICS / APPLIED MATHEMATICS / COMPUTATIONAL MATHEMATICS / COMPUTATIONAL METHODS IN ENGINEERING / COMPUTATIONAL OPERATIONS RESEARCH

EDUCATION

PHD
UNIVERSITI PUTRA MALAYSIA, SERDANG, SELANGOR
Graduated : 2003

MASTER SAINS
UNIVERSITI PUTRA MALAYSIA, SERDANG, SELANGOR
Graduated : 2000

BACELOR SAINS
UNIVERSITI PUTRA MALAYSIA, SERDANG, SELANGOR
Graduated : 1997

BOOK PUBLICATION

1. Prosiding Simposium Kebangsaan Sains Matematik ke-17
ISPN: 978-967-960-2566-2

2. International Conference on Mathematical Sciences and Statistics: Selected Papers
ISPN: 978-981-4585-32-3

JOURNAL PUBLICATION

1. Scaled memoryless symmetric rank one method for large-scale optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

2. Jacobian-Free Diagonal Newton?s Method for Solving Nonlinear Systems with Singular Jacobian
Journal type: Citation-Indexed - Scopus

3. A new class of nonlinear conjugate gradient coefficients with global convergence properties
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

4. Lyapunov Characterization for the Stability of Stochastic Control Systems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

5. BFGS Method: A New Search Direction
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

6. A three-term conjugate gradient method with nonmonotone line search for unconstrained optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

7. A multiperson pursuit problem on a closed convex set in Hilbert space
Journal type: Other Abstracting / Indexing Bodies

8. Improved Hessian Approximation with Modified Quasi- Cauchy Relation for a Gradient-type Method
Journal type: Other Abstracting / Indexing Bodies

9. Newton method for nonlinear system with singular Jacobian using diagonal updating
Journal type: Other Abstracting / Indexing Bodies

10. Jacobian Computation-free Newton?s Method for Systems of Nonlinear Equations
Journal type: Non Citation-Indexed

11. A Low Memory Solver for Integral Equations of Chandrasekhar Type in the Radiative Transfer Problems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

12. POSITIVE-DEFINITE MEMORYLESS SYMMETRIC RANK ONE METHOD FOR LARGE-SCALE UNCONSTRAINED OPTIMIZATION
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

13. Improved Hessian approximations with modified secant equations for symmetric rank-one method
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

14. Scaling on Diagonal Quasi-Newton Update for Large-scale Unconstrained Optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

15. Dynamic robust stabilization of stochastic differential control systems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

16. Sufficient descent three term conjugate gradient method via symmetric rank-one update for large-scale optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

17. Predicting Minimum Energy structure of a Peptide via a Modified Potential Smoothing Kernel
Journal type: Non Citation-Indexed

18. Improved Hessian Approximation with Modified Quasi-Cauchy Relation for a Gradient-type Method
Journal type: Other Abstracting / Indexing Bodies

19. A comparative study of time-cost trade off approaches within critical path method
Journal type: Citation-Indexed - Scopus

20. Newton Method for systems of nonlinear equations with singular Jacobian using diagonal updating
Journal type: Citation-Indexed - Scopus

21. A notion of stability in probability of stochastic nonlinear systems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

22. Preconditioned Subspace Quasi-Newton Method for Large Scale Optimization
Journal type: Citation-Indexed - Scopus

23. A New Newton?s Method with Diagonal Jacobian Approximation for Systems of Nonlinear Equations
Journal type: Citation-Indexed - Scopus

24. A Comparative Study on Time-Cost Tradeoff Approaches within Critical Path Method
Journal type: Citation-Indexed - Scopus

25. New quasi-Newton method via higher order tensor model
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

26. A symmetric rank-one method based on extra updating techniques for unconstrained optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

27. On the performance of a new symmetric rank-one method with restart for solving unconstrained optimization problems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

28. A class of diagonal preconditioners for limited memory BFGS method
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

29. A new gradient method via least change secant update
Journal type: Non Citation-Indexed

30. A restarting approach on symmetric rank one update for unconstrained optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

31. Scaled Memoryless BFGS Preconditioned Steepest Descent Method for very Large-Scale Unconstrained Optimization
Journal type: Other Abstracting / Indexing Bodies

32. A Linear Programming Approach to Maximize Savings by Stretching Noncritical Activities
Journal type: Citation-Indexed - Scopus

33. A matrix-free quasi-Newton method for solving large-scale nonlinear systems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

34. Scaled Diagonal Gradient-Type Method with Extra Update for Large-Scale Unconstrained Optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

35. Diagonal quasi-Newton method via variational principle under generalized Frobenius norm
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

36. An Efficient Solver for Systems of Nonlinear Equations with Singular Jacobian via Diagonal Updating
Journal type: Citation-Indexed - Scopus

37. Structured symmetric rank-one method for unconstrained optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

38. On exponential stability of composite stochastic control systems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

39. A Two-Step Matrix-Free Secant Method for Large-scale Systems of Nonlinear Equations
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

40. Quasi-Newton methods based on ordinary differential equation approach for unconstrained nonlinear optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

41. A Class of Diagonal Quasi-Newton Methods for Large-Scale Convex Minimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

42. A new gradient method via least change secant updates
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

43. An improved multi-step gradient-type method for large scale optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

44. On the asymptotical and practical stability of stochastic control systems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

45. Accumulative Approach in Multistep Diagonal Gradient-Type Method for Large-Scale Unconstrained Optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

46. Convergence of a positive definite symmetric rank one method with restart
Journal type: Other Abstracting / Indexing Bodies

47. A new two-step gradient-type method for large-scale unconstrained optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

48. A Monotone Gradient Method VIA Weak Secant Equation for Unconstrained Optimization
Journal type: Other Abstracting / Indexing Bodies

49. A monotone gradient method via weak secant equation for unconstrained optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

50. Convergence and Stability of Line Search Methods for Unconstrained Optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

51. Exponential input-to-state stability of composite stochastic systems
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

52. A NEW DIAGONAL GRADIENT-TYPE METHOD FOR LARGE SCALE UNCONSTRAINED OPTIMIZATION
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

53. PARTIAL NEWTON METHODS FOR A SYSTEM OF EQUATIONS
Journal type: Non Citation-Indexed

54. Limited Memory Methods with Improved Symmetric Rank-one Updates and Its Applications on Nonlinear Image Restoration
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

55. Stabilization of some composite stochastic control systems with nontrivial solutions
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

56. A Gauss-Newton Approach for Nonlinear Optimal Control Problem with Model-Reality Differences
Journal type: Other Abstracting / Indexing Bodies

57. Multi-Spectral Gradient Method via Variational Technique under Log-Determinant Norm for Large-Scale Optimization
Journal type: Other Abstracting / Indexing Bodies

58. Cluster approach in solving large scheduling problems
Journal type: Non Citation-Indexed

59. Multi-step Spectral gradient methods with modified weak secant relation for large scale unconstrained optimization
Journal type: Citation-Indexed - Scopus

60. Higher order curvature information and its application in a modified diagonal Secant method
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

61. Discrete-Time Nonlinear Stochastic Optimal Control Problem Based on Stochastic Approximation Approach
Journal type: Other Abstracting / Indexing Bodies

62. Efficient ODE-based Methods for Unconstrained Optimization
Journal type: Other Abstracting / Indexing Bodies

63. Application of Conjugate Gradient Approach for Nonlinear Optimal Control Problem with Model-Reality Differences
Journal type: Citation-Indexed Journal - ERA

64. Gradient method with multiple damping for large-scale unconstrained optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

65. Exponential stability of some interconnected stochastic control systems with non-trivial equilibria
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

66. Stochastic Optimal Control of Economic Growth Model under Research and Development Investment with Kalman Filtering Approaches
Journal type: Citation-Indexed - Scopus

67. Diagonal Quasi-Newton Updating Strategy with Cholesky Factor via Variational Principle
Journal type: MYCITE

68. MINIMUM ENERGY CONTROL OF FRACTIONAL-ORDER DIFFERENTIAL-ALGEBRAIC SYSTEM
Journal type: Citation-Indexed - Scopus

69. Proximal variable metric method with spectral diagonal update for large scale sparse optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

70. Improved Stochastic Gradient Descent Algorithm with Mean-GradientAdaptiveStepsize for Solving Large-Scale Optimization Problems
Journal type: MYCITE

71. Solving Quadratic Assignment Problem by Using Meta-heuristic Search Method
Journal type: Non Citation-Indexed

72. Augmented Lagrangian Method for Optimal Control of Interconnected Systems
Journal type: MYCITE

73. Diagonal Newton Method for Solving Large-Scale Linear Systems
Journal type: MYCITE

74. Quasi-Newton Method for Sparse Matrix Factorization with Frobenius norm Regularization
Journal type: MYCITE

75. Memoryless quasi-Newton-type methods via some weak secant relations for large-scale unconstrained optimization
Journal type: Citation-Indexed Journal - Science Citation Index (JCR)

76. A New M/M/1 Queueing System with Bridging Gap Minimization
Journal type: Citation-Indexed - Scopus

77. Topic Modeling: A Review via Nonnegative Matrix Factorization
Journal type: Citation-Indexed - Scopus

78. Modified Quasi-Newton Method via Linear Gradient Flow System
Journal type: MYCITE

PUBLICATION

2025

A New M/M/1 Queueing System with Bridging Gap Minimization

2024

Memoryless quasi-Newton-type methods via some weak secant relations for large-scale unconstrained optimization

2023

Proximal variable metric method with spectral diagonal update for large scale sparse optimization

2023

Modified Blum-Blum-Shub Generator for Generation of Pseudo-random Number

2022

Stochastic Optimal Control of Economic Growth Model under Research and Development Investment with Kalman Filtering Approaches

2022

MINIMUM ENERGY CONTROL OF FRACTIONAL-ORDER DIFFERENTIAL-ALGEBRAIC SYSTEM

2021

Exponential stability of some interconnected stochastic control systems with non-trivial equilibria

2020

Diagonal quasi-Newton methods via least change updating principle with weighted Frobenius norm

2019

Gradient method with multiple damping for large-scale unconstrained optimization

2018

Higher order curvature information and its application in a modified diagonal Secant method

2018

Application of Conjugate Gradient Approach for Nonlinear Optimal Control Problem with Model-Reality Differences

2018

Multi-step Spectral gradient methods with modified weak secant relation for large scale unconstrained optimization

2018

Efficient ODE-based Methods for Unconstrained Optimization

2018

Discrete-Time Nonlinear Stochastic Optimal Control Problem Based on Stochastic Approximation Approach

2017

Stabilization of some composite stochastic control systems with nontrivial solutions

2017

A Gauss-Newton Approach for Nonlinear Optimal Control Problem with Model-Reality Differences

2017

Multi-Spectral Gradient Method via Variational Technique under Log-Determinant Norm for Large-Scale Optimization

2016

Sufficient descent three term conjugate gradient method via symmetric rank-one update for large-scale optimization

2016

A three-term conjugate gradient method with nonmonotone line search for unconstrained optimization

2016

A Class of Diagonal Quasi-Newton Methods for Large-Scale Convex Minimization

2016

Diagonal quasi-Newton method via variational principle under generalized Frobenius norm

2015

Lyapunov Characterization for the Stability of Stochastic Control Systems

2015

A Class of Diagonal Quasi-Newton Methods for Large-Scale Convex Minimization

2014

Lyapunov Characterization for the Stability of Stochastic Control Systems

2014

Limited Memory Methods with Improved Symmetric Rank-one Updates and Its Applications on Nonlinear Image Restoration

2014

A sufficient descent three-term conjugate gradient method via symmetric rank-one update for large-scale optimization

2014

BFGS Method: A New Search Direction

2014

Quasi-Newton methods based on ordinary differential equation approach for unconstrained nonlinear optimization

2013

A NEW DIAGONAL GRADIENT-TYPE METHOD FOR LARGE SCALE UNCONSTRAINED OPTIMIZATION

2013

A notion of stability in probability of stochastic nonlinear systems

2013

A class of diagonal preconditioners for limited memory BFGS method

2013

Scaled Diagonal Gradient-Type Method with Extra Update for Large-Scale Unconstrained Optimization

2013

On the asymptotical and practical stability of stochastic control systems

2013

Dynamic robust stabilization of stochastic differential control systems

2013

Convergence and Stability of Line Search Methods for Unconstrained Optimization

2013

Exponential input-to-state stability of composite stochastic systems

2013

On exponential stability of composite stochastic control systems

2012

Accumulative Approach in Multistep Diagonal Gradient-Type Method for Large-Scale Unconstrained Optimization

2012

On the performance of a new symmetric rank-one method with restart for solving unconstrained optimization problems

2012

A Two-Step Matrix-Free Secant Method for Large-scale Systems of Nonlinear Equations

2012

Scaling on Diagonal Quasi-Newton Update for Large-scale Unconstrained Optimization

2012

A new class of nonlinear conjugate gradient coefficients with global convergence properties

2011

New quasi-Newton method via higher order tensor model

2011

Improved Hessian approximations with modified secant equations for symmetric rank-one method

2011

Structured symmetric rank-one method for unconstrained optimization

2011

A comparative study of time-cost trade off approaches within critical path method

2011

POSITIVE-DEFINITE MEMORYLESS SYMMETRIC RANK ONE METHOD FOR LARGE-SCALE UNCONSTRAINED OPTIMIZATION

2011

A Comparative Study on Time-Cost Tradeoff Approaches within Critical Path Method

2011

A Low Memory Solver for Integral Equations of Chandrasekhar Type in the Radiative Transfer Problems

2011

Scaled memoryless symmetric rank one method for large-scale optimization

2011

A new gradient method via least change secant updates

2011

Jacobian-Free Diagonal Newton?s Method for Solving Nonlinear Systems with Singular Jacobian

2011

An improved multi-step gradient-type method for large scale optimization

2011

A matrix-free quasi-Newton method for solving large-scale nonlinear systems

2011

A symmetric rank-one method based on extra updating techniques for unconstrained optimization

2010

A monotone gradient method via weak secant equation for unconstrained optimization

2010

Improved Hessian Approximation with Modified Quasi-Cauchy Relation for a Gradient-type Method

2010

A new gradient method via least change secant update

2010

A Linear Programming Approach to Maximize Savings by Stretching Noncritical Activities

2010

Newton method for nonlinear system with singular Jacobian using diagonal updating

2010

A new two-step gradient-type method for large-scale unconstrained optimization

2010

An Efficient Solver for Systems of Nonlinear Equations with Singular Jacobian via Diagonal Updating

2009

Scaled Memoryless BFGS Preconditioned Steepest Descent Method for very Large-Scale Unconstrained Optimization

2009

Convergence of a positive definite symmetric rank one method with restart

2009

A restarting approach on symmetric rank one update for unconstrained optimization

2008

A multiperson pursuit problem on a closed convex set in Hilbert space

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