# Items where Author is "Leong, Wah June"

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**85**.## Article

Abedi, Fakhreddin and Leong, Wah June
(2017)

*Stabilization of some composite stochastic control systems with nontrivial solutions.*European Journal of Control, 38. pp. 16-21. ISSN 0947-3580; ESSN: 1435-5671

Sie, Long Kek and Jiao, Li and Leong, Wah June and Abd Aziz, Mohd Ismail
(2017)

*A gauss-newton approach for nonlinear optimal control problem with model-reality differences.*Open Journal of Optimization, 6. 85 - 100. ISSN 2325-7105; ESSN: 2325-7091

Ghanbari, Shamsollah and Othman, Mohamed and Abu Bakar, Mohd Rizam and Leong, Wah June
(2016)

*Multi-objective method for divisible load scheduling in multi-level tree network.*Future Generation Computer Systems, 54. pp. 132-143. ISSN 0167-739X; ESSN: 1872-7115

Enshaei, Sharareh and Leong, Wah June and Farid, Mahboubeh
(2016)

*Diagonal quasi-Newton method via variational principle under generalized Frobenius norm.*Optimization Methods and Software, 31 (6). pp. 1258-1271. ISSN 1055-6788; ESSN: 1029-4937

Moyi, Aliyu Usman and Leong, Wah June
(2016)

*Sufficient descent three term conjugate gradient method via symmetric rank-one update for large-scale optimization.*Optimization, 65 (1). pp. 121-143. ISSN 0233-1934; ESSN: 1029-4945

Abdul-Zahra, Inam and Abbas, Iraq Tereq and Kalaf, Bayda Atiya and Abu Bakar, Mohd Rizam and Leong, Wah June and Monsi, Mansor
(2016)

*The role of dynamic programming in the distribution of investment allocations between production lines with an application.*International Journal of Pure and Applied Mathematics, 106 (2). pp. 365-380. ISSN 1311-8080; ESSN: 1314-3395

Arzuka, Ibrahim and Abu Bakar, Mohd Rizam and Leong, Wah June
(2016)

*A scaled three-term conjugate gradient method for unconstrained optimization.*Journal of Inequalities and Applications, 2016. art. no. 325. pp. 1-16. ISSN 1025-5834; ESSN: 1029-242X

Moyi, Aliyu Usman and Leong, Wah June
(2016)

*A three-term conjugate gradient method with nonmonotone line search for unconstrained optimization.*Pacific Journal of Optimization, 12 (3). pp. 587-601. ISSN 1348-9151

Leong, Wah June
(2015)

*A class of diagonal quasi-newton methods for large-scale convex minimization.*Bulletin of the Malaysian Mathematical Sciences Society. pp. 1-14. ISSN 0126-6705

Abedi, Fakhreddin and Leong, Wah June and Abedi, Mohammad
(2015)

*Lyapunov characterization for the stability of stochastic control systems.*Mathematical Problems in Engineering, 2015. art. no. 584935. pp. 1-7. ISSN 1024-123X; ESSN: 1563-5147

Ghanbari, Shamsollah and Othman, Mohamed and Abu Bakar, Mohd Rizam and Leong, Wah June
(2015)

*Priority-based divisible load scheduling using analytical hierarchy process.*Applied Mathematics & Information Sciences, 9 (5). pp. 2541-2552. ISSN 1935-0090; ESSN: 2325-0399

Nasab, Aliasghar Kazemi and Kilicman, Adem and Atabakan, Z. Pashazadeh and Leong, Wah June
(2015)

*A numerical approach for solving singular nonlinear LaneEmden type equations arising in astrophysics.*New Astronomy, 34. pp. 178-186. ISSN 1384-1076

Heydar, Maryam and Abu Bakar, Mohd Rizam and Mansourirad, Ehsanollah and Leong, Wah June and Senu, Norazak
(2014)

*An efficiency evaluation problem including fuzzy weights.*Malaysian Journal of Mathematical Sciences, 8 (S). pp. 61-70. ISSN 1823-8343; ESSN: 2289-750X

Khiyabani, Farzin Modarres and Leong, Wah June
(2014)

*Quasi-Newton methods based on ordinary differential equation approach for unconstrained nonlinear optimization.*Applied Mathematics and Computation, 233. pp. 272-291. ISSN 0096-3003; ESSN: 1873-5649

Ibrahim, Mohd Asrul Hery and Mamat, Mustafa and Leong, Wah June
(2014)

*BFGS method: a new search direction.*Sains Malaysiana, 43 (10). pp. 1591-1597. ISSN 0026-6039

Ng, Choong Boon and Leong, Wah June and Monsi, Mansor
(2014)

*Diagonal preconditioned conjugate gradient algorithm for unconstrained optimization.*Pertanika Journal of Science & Technology, 22 (1). pp. 213-224. ISSN 0128-7680; ESSN: 2231-8526

Khiyabani, Farzin Modarres and Leong, Wah June
(2014)

*Limited memory methods with improved symmetric rank-one updates and its applications on nonlinear image restoration.*Arabian Journal for Science and Engineering, 39 (11). pp. 7823-7838. ISSN 1319-8025; ESSN: 1319-8025

Sim, Hong Seng and Leong, Wah June and Abu Hassan, Malik and Ismail, Fudziah
(2014)

*Preconditioned subspace quasi-newton method for large scale optimization.*Pertanika Journal of Science & Technology, 22 (1). pp. 175-192. ISSN 0128-7680; ESSN: 2231-8526

Ibrahim, Mohd Asrul Hery and Mamat, Mustafa and Leong, Wah June and Mohammad Sofi, Azfi Zaidi
(2014)

*The algorithms of Broyden-CG for unconstrained optimization problems.*International Journal of Mathematical Analysis, 8 (52). pp. 2591-2600. ISSN 1312-8876; ESSN: 1314-7579

Ibrahim, Mohd Asrul Hery and Mamat, Mustafa and Leong, Wah June
(2014)

*The hybrid BFGS-CG method in solving unconstrained optimization problems.*Abstract and Applied Analysis, 2014. art. no. 507102. pp. 1-6. ISSN 1085-3375; ESSN: 1687-0409

Abedi, Fakhreddin and Leong, Wah June and Chaharborj, Sarkhosh Seddighi
(2013)

*A notion of stability in probability of stochastic nonlinear systems.*Advances in Difference Equations, 2013. art. no. 363. pp. 1-8. ISSN 1687-1839; ESSN: 1687-1847

Leong, Wah June and Goh, Bean San
(2013)

*Convergence and stability of line search methods for unconstrained optimization.*Acta Applicandae Mathematicae, 127 (1). pp. 155-167. ISSN 0167-8019; ESSN:1572-9036

Sim, Hong Seng and Leong, Wah June and Abu Hassan, Malik and Ismail, Fudziah
(2013)

*Some diagonal preconditioners for limited memory quasi-Newton method for large Scale optimization.*Malaysian Journal of Mathematical Sciences, 7 (2). pp. 181-201. ISSN 1823-8343; ESSN: 2289-750X

Marjugi, Siti Mahani and Leong, Wah June
(2013)

*Diagonal hessian approximation for limited memory quasi-newton via variational principle.*Journal of Applied Mathematics, 2013. art. no. 523476. pp. 1-8. ISSN 1110-757X; ESSN: 1687-0042

Abedi, Fakhreddin and Leong, Wah June
(2013)

*Dynamic robust stabilization of stochastic differential control systems.*IMA Journal of Mathematical Control and Information, 30 (4). pp. 559-569. ISSN 0265-0754; ESSN: 1471-6887

Abedi, Fakhreddin and Leong, Wah June and Chaharborj, Sarkhosh Seddighi
(2013)

*Exponential input-to-state stability of composite stochastic systems.*Advances in Difference Equations, 2013. art. no. 208. pp. 1-10. ISSN 1687-1839; ESSN: 1687-1847

Abedi, Fakhreddin and Leong, Wah June
(2013)

*On exponential stability of composite stochastic control systems.*Abstract and Applied Analysis, 2013. art. no. 695816. pp. 1-7. ISSN 1085-3375; ESSN: 1687-0409

Abedi, Fakhreddin and Leong, Wah June and Chaharborj, Sarkhosh Seddighi
(2013)

*On the asymptotical and practical stability of stochastic control systems.*Mathematical Problems in Engineering, 2013 (560647). pp. 1-10. ISSN 1024-123X

Goh, Bean San and Leong, Wah June and Siri, Zailan
(2013)

*Partial Newton methods for a system of equations.*Numerical Algebra, Control and Optimization, 3 (3). pp. 463-469. ISSN 2155-3289; ESSN: 2155-3297

Farid, Mahboubeh and Leong, Wah June and Malekmohammadi, Najmeh and Mamat, Mustafa
(2013)

*Scaled diagonal gradient-type method with extra update for large-scale unconstrained optimization.*Abstract and Applied Analysis, 2013. art. no. 532041. pp. 1-5. ISSN 1085-3375; ESSN: 1687-0409

Leong, Wah June and Chen, Chuei Yee
(2013)

*A class of diagonal preconditioners for limited memory BFGS method.*Optimization Methods and Software, 28 (2). pp. 379-392. ISSN 1055-6788; ESSN: 1029-4937

Farid, Mahboubeh and Leong, Wah June and Zheng, Lihong
(2013)

*A new diagonal gradient-type method for large scale unconstrained optimization.*UPB Scientific Bulletin, Series A: Applied Mathematics and Physics, 75 (1). pp. 57-64. ISSN 1223-7027

Varnamkhasti, Mohammad Jalali and Lee, Lai Soon and Abu Bakar, Mohd Rizam and Leong, Wah June
(2012)

*A genetic algorithm with fuzzy crossover operator and probability.*Advances in Operations Research, 2012 (956498). pp. 1-16. ISSN 1687-9147; ESSN: 1687-9155

Leong, Wah June and Abu Hassan, Malik
(2011)

*Scaled memoryless symmetric rank one method for large-scale optimization.*Applied Mathematics and Computation, 218 (2). pp. 413-418. ISSN 0096-3003

Leong, Wah June and Abu Hassan, Malik and Yusuf, Muhammad Waziri
(2011)

*A matrix-free quasi-Newton method for solving large-scale nonlinear systems.*Computers and Mathematics with Applications, 62 (5). pp. 2354-2363. ISSN 0898-1221

Modarres, Farzin and Abu Hassan, Malik and Leong, Wah June
(2011)

*A symmetric rank-one method based on extra updating techniques for unconstrained optimization.*Computers and Mathematics with Applications, 62 (1). pp. 392-400. ISSN 0898-1221

Leong, Wah June and Abu Hassan, Malik
(2011)

*A new gradient method via least change secant update.*International Journal of Computer Mathematics, 88 (4). pp. 816-828. ISSN 0020-7160; ESSN: 1029-0265

Biglari, Fahmeh and Abu Hassan, Malik and Leong, Wah June
(2011)

*New quasi-Newton methods via higher order tensor models.*Journal of Computational and Applied Mathematics, 235 (8). pp. 2412-2422. ISSN 0377-0427

Modarres, Farzin and Abu Hassan, Malik and Leong, Wah June
(2011)

*Improved Hessian approximations with modified secant equations for symmetric rank-one method.*Journal of Computational and Applied Mathematics, 235 (8). pp. 2423-2431. ISSN 0377-0427; ESSN: 1879-1778

Yusuf, Mohammed Waziri and Leong, Wah June and Abu Hassan, Malik
(2011)

*Jacobian-free diagonal Newton's method for solving nonlinear systems with singular Jacobian.*Malaysian Journal of Mathematical Sciences, 5 (2). pp. 241-255. ISSN 1823-8343

Leong, Wah June and Abu Hassan, Malik
(2011)

*Positive-definite memoryless symmetric rank one method for large-scale unconstrained optimization.*Pacific Journal of Optimization, 7 (1). pp. 29-41. ISSN 1348-9151; ESSN: 1349-8169

Modarres, Farzin and Abu Hassan, Malik and Leong, Wah June
(2011)

*Structured symmetric rank-one method for unconstrained optimization.*International Journal of Computer Mathematics, 88 (12). pp. 2608-2617. ISSN 0020-7160; ESSN: 1029-0265

Khalaf, Wakas S. and Leong, Wah June and Abu Bakar, Mohd Rizam and Lee, Lai Soon
(2011)

*A comparative study on time-cost trade-off approaches within critical path method.*Journal of Applied Sciences, 11 (6). pp. 920-931. ISSN 1812-5654; ESSN: 1812-5662

Farid, Mahboubeh and Leong, Wah June
(2011)

*An improved multi-step gradient-type method for large scale optimization.*Computers and Mathematics with Applications, 61 (11). pp. 3312-3318. ISSN 0898-1221; ESSN: 1873-7668

Yusuf, Muhammad Waziri and Leong, Wah June and Abu Hassan, Malik and Monsi, Mansor
(2011)

*A low memory solver for integral equations of Chandrasekhar type in the radiative transfer problems.*Mathematical Problems in Engineering, 2011 (467017). pp. 1-12. ISSN 1024-123X; ESSN: 1563-5147

Yusuf, Mohammed Waziri and Leong, Wah June and Abu Hassan, Malik and Monsi, Mansor
(2010)

*A new Newtons method with diagonal Jacobian approximation for systems of nonlinear equations.*Journal of Mathematics and Statistics, 6 (3). pp. 246-252. ISSN 1549-3644; ESSN: 1558-6359

Yusuf, Mohammed Waziri and Leong, Wah June and Abu Hassan, Malik and Monsi, Mansor
(2010)

*Newton method for nonlinear system with singular Jacobian using diagonal updating.*International Journal of Mathematics and Computations, 8 (S10). pp. 1-8. ISSN 0974-5718; ESSN: 0974-570X

Khiyabani, Farzin Modarres and Abu Hassan, Malik and Leong, Wah June
(2010)

*Convergence of symmetric rank-one method based on modified Quasi-Newton equation.*Journal of Mathematics Research, 2 (3). pp. 97-102. ISSN 1916-9795; ESSN: 1916-9809

Farid, Mahboubeh and Leong, Wah June and Abu Hassan, Malik
(2010)

*A new two-step gradient-type method for large-scale unconstrained optimization.*Computers and Mathematics with Applications, 59 (10). pp. 3301-3307. ISSN 0898-1221; ESSN: 1873-7668

Shabanzadeh, Parvaneh and Abu Hassan, Malik and Leong, Wah June
(2010)

*A derivative-free optimization method for solving classification problem.*Journal of Computer Science, 6 (3). pp. 369-373. ISSN 1549-3636; ESSN: 1552-6607

Leong, Wah June and Farid, Mahboubeh and Abu Hassan, Malik
(2010)

*Improved Hessian approximation with modified quasi-Cauchy relation for a gradient-type method.*Advance Modeling and Optimization, 12 (1). pp. 37-44. ISSN 1841-4311

Yusuf, Mohammed Waziri and Leong, Wah June and Abu Hassan, Malik and Monsi, Mansor
(2010)

*Jacobian computation-free Newton's method for systems of nonlinear equations.*Journal of Numerical Mathematics and Stochastics, 2 (1). pp. 54-63. ISSN 2151-2302

Shabanzadeh, Parvaneh and Abu Hassan, Malik and Leong, Wah June and Mohagheghtabar, Maryam
(2010)

*Using Pattern Search Methods for Minimizing Clustering Problems.*World Academy of Science, Engineering and Technology, 62 (February). pp. 158-162. ISSN 1307-6892

Abedi, Fakhreddin and Abu Hassan, Malik and Leong, Wah June
(2010)

*A characterization of maximal Lyapunov function for stability of a nonlinear system.*Advances in Theoretical and Applied Mathematics, 5 (2). pp. 237-246. ISSN 0973-4554; ESSN: 0974-0236

Waziri, Mohammed Yusuf and Leong, Wah June and Abu Hassan, Malik and Monsi, Mansor
(2010)

*An efficient solver for systems of nonlinear equations with singular Jacobian via diagonal updating.*Applied Mathematical Sciences, 4 (69-72). pp. 3403-3412. ISSN 1312-885X; ESSN: 1314-7552

Khalaf, Wakas S. and Leong, Wah June and Lee, Lai Soon and Abu Bakar, Mohd Rizam
(2010)

*A linear programming approach to maximize savings by stretching noncritical activities.*Australian Journal of Basic and Applied Sciences, 4 (11). pp. 5649-5657. ISSN 1991-8178

Leong, Wah June and Abu Hassan, Malik and Farid, Mahboubeh
(2010)

*A monotone gradient method via weak secant equation for unconstrained optimization.*Taiwanese Journal of Mathematics, 14 (2). pp. 413-423. ISSN 1027-5487; ESSN: 2224-6851

Abu Hassan, Malik and Leong, Wah June and Farid, Mahboubeh
(2009)

*A new gradient method via quasi-Cauchy relation which guarantees descent.*Journal of Computational and Applied Mathematics, 230 (1). pp. 300-305. ISSN 0377-0427; ESSN: 1879-1778

Leong, Wah June and Abu Hassan, Malik
(2009)

*Convergence of a positive definite symmetric rank one method with restart.*Advance Modeling and Optimization, 11 (4). pp. 423-433. ISSN 1841-4311

Modarres, Farzin and Abu Hassan, Malik and Leong, Wah June
(2009)

*Memoryless modified symmetric rank-one method for large-scale unconstrained optimization.*American Journal of Applied Sciences, 6 (12). pp. 2054-2059. ISSN 1546-9239; ESSN: 1554-3641

Modarres, Farzin and Abu Hassan, Malik and Leong, Wah June
(2009)

*Multi-steps symmetric rank-one update for unconstrained optimization.*World Applied Sciences Journal, 7 (5). pp. 610-615. ISSN 1818-4952

Leong, Wah June and Abu Hassan, Malik
(2009)

*Scaled memoryless BFGS preconditioned steepest descent method for very large-scale unconstrained optimization.*Journal of Information and Optimization Sciences, 30 (2). pp. 387-396. ISSN 0252-2667; ESSN: 2169-0103

Leong, Wah June and Abu Hassan, Malik
(2009)

*A restarting approach on symmetric rank one update for unconstrained optimization.*Computational Optimization and Applications, 42 (3). pp. 327-334. ISSN 0926-6003; ESSN: 1573-2894

Leong, Wah June and Abu Hassan, Malik
(2008)

*Predicting minimum energy structure of a peptide via a modified potential smoothing kernel.*Malaysian Journal of Mathematical Sciences, 2 (2). pp. 29-39. ISSN 1823-8343; ESSN: 2289-750X

Toaha, Syamsuddin and Abu Hassan, Malik and Ismail, Fudziah and Leong, Wah June
(2008)

*Stability analysis and maximum profit of predator - prey population model with time delay and constant effort of harvesting.*Malaysian Journal of Mathematical Sciences, 2 (2). pp. 147-159. ISSN 1823-8343; ESSN: 2289-750X

Leong, Wah June and Ibragimov, Gafurjan
(2008)

*A multiperson pursuit problem on a closed convex set in Hilbert space.*Far East Journal of Applied Mathematics, 33 (2). pp. 205-214. ISSN 0972-0960

Abu Hassan, Malik and Monsi, Mansor and Leong, Wah June
(2002)

*Convergence of the Steepest Descent Method for Minimizing Convex Functions.*Pertanika Journal of Science & Technology, 10 (2). pp. 145-152. ISSN 0128-7680

Abu Hassan, Malik and Monsi, Mansor and Leong, Wah June
(1999)

*A Switching Criterion in Hybrid Quasi-Newton BFGS - Steepest Descent Direction.*Pertanika Journal of Science & Technology, 7 (2). pp. 111-123. ISSN 0128-7680## Book

Kilicman, Adem and Leong, Wah June and Eshkuvatov, Zainidin K.
(2014)

*International conference on mathematical sciences and statistics 2013: selected papers.*Springer-Verlag, Singapore. ISBN 9789814585323; EISBN: 9789814585330## Conference or Workshop Item

Sim, Hong Seng and Leong, Wah June and Chen, Chuei Yee and Ibrahim, Siti Nur Iqmal
(2015)

*Diagonal quasi-Newton updating formula using log-determinant norm.*In: 23rd Malaysian National Symposium of Mathematical Sciences (SKSM23), 24-26 Nov. 2015, Johor Bahru, Malaysia. (pp. 1-7).

Sim, Hong Seng and Leong, Wah June and Chen, Chuei Yee and Ibrahim, Siti Nur Iqmal
(2015)

*Diagonal quasi-Newton updating formula via variational principle under the log-determinant measure.*In: International Conference on Control, Optimization and Autonomous Vehicles 2015 (COAV2015), 30-31 July 2015, Putrajaya, Malaysia. (p. 21).

Ibrahim, Mohd Asrul Hery and Mamat, Mustafa and Leong, Wah June and Mohammad Sofi, Azfi Zaidi
(2013)

*The CG-BFGS method for unconstrained optimization problems.*In: 21st National Symposium on Mathematical Sciences (SKSM21), 6-8 Nov. 2013, Penang, Malaysia. (pp. 167-172).

Ghanbari, Shamsollah and Othman, Mohamed and Leong, Wah June and Abu Bakar, Mohd Rizam
(2013)

*Multi-criteria based algorithm for scheduling divisible load.*In: First International Conference on Advanced Data and Information Engineering (DaEng-2013), 16-18 Dec. 2013, Kuala Lumpur, Malaysia. (pp. 547-554).

Sim, Hong Seng and Leong, Wah June and Ismail, Fudziah
(2013)

*Preconditioning on subspace quasi-Newton method for large scale unconstrained optimization.*In: Statistics and Operational Research International Conference (SORIC 2013), 3–5 Dec. 2013, Sarawak, Malaysia. (pp. 297-305).

Moyi, Aliyu Usman and Leong, Wah June
(2013)

*A new inexact line search method for convex optimization problems.*In: 2013 International Conference on Applied Mathematics and Computational Methods (AMCM 2013), 28-30 Sept. 2013, Venice, Italy. (pp. 59-61).

Waziri, Mohammed Yusuf and Leong, Wah June and Abu Hassan, Malik and Monsi, Mansor
(2011)

*Two-step diagonal Newton method for large-scale systems of nonlinear equations.*In: 4th International Conference on Modeling, Simulation and Applied Optimization (ICMSAO 2011), 19-21 Apr. 2011, Kuala Lumpur, Malaysia. .

Leong, Wah June and Abu Hassan, Malik
(2010)

*A family of least change diagonally quasi-Newton methods for nonlinear equations.*In: The 8th International Conference on Optimization: Techniques and Applications (ICOTA 8), 10-13 Dec. 2010, Shanghai, China. (pp. 315-316).

Khiyabani, Farzin Modarres and Abu Hassan, Malik and Leong, Wah June
(2009)

*Memoryless symmetric rank-one method based on modified secant equation for large-scale unconstrained optimization.*In: Fundamental Science Congress 2009 (FSC 2009), 17-18 June 2009, Auditorium Jurutera, Fakulti Kejuruteraan, Universiti Putra Malaysia. (pp. 374-375).

Leong, Wah June and Chen, Chuei Yee
(2009)

*A class of diagonally preconditioned limited memory BFGS method for large scale unconstrained optimization.*In: Fundamental Science Congress 2009 (FSC 2009), 17-18 June 2009, Auditorium Jurutera, Fakulti Kejuruteraan, Universiti Putra Malaysia. (pp. 364-365).

Shabanzadeh, Parvaneh and Abu Hasan, Malik and Leong, Wah June
(2009)

*A nonsmooth optimization method for clustering problem.*In: Fundamental Science Congress 2009 (FSC 2009), 17-18 June 2009, Auditorium Jurutera, Fakulti Kejuruteraan, Universiti Putra Malaysia. (pp. 425-426).

Abedi, Fakhreddin and Abu Hassan, Malik and Leong, Wah June
(2009)

*A remark on the uniqueness of solutions for a perturbed system using the Zubov method.*In: Fundamental Science Congress 2009 (FSC 2009), 17-18 June 2009, Auditorium Jurutera, Fakulti Kejuruteraan, Universiti Putra Malaysia. (pp. 372-373).

Leong, Wah June and Abu Hassan, Malik
(2008)

*Scaled memoryless symmetric rank one method for large-scale unconstrained optimization.*In: 4th Sino-Japanese Optimization Meeting (SJOM 2008), 27-31 Aug. 2008, Tainan, Taiwan. (pp. 1-10).

Leong, Wah June
(2007)

*A new stepsize for gradient method via weak secant equation.*In: The 7th International Conference on Optimization : Techniques and Applications (ICOTA7), 12-15 Dec. 2007, Kobe, Japan. . (Unpublished)## Thesis

Leong, Wah June
(2003)

*Modified Quasi-Newton Methods For Large-Scale Unconstrained Optimization.*["eprint_fieldopt_thesis_type_phd" not defined] thesis, Universiti Putra Malaysia.

Leong, Wah June
(1999)

*On the Modifications of a Broyden's Single Parameter Rank-Two Quasi-Newton Method for Unconstrained Minimization.*Masters thesis, Universiti Putra Malaysia.