Dr. Nur Syazreen Ahmad

Infografik Nur Syazreen Ahmad 2020 V2

Last Updated on 29.06.2020


- Constrained and Nonlinear control
- Passivity and Lyapunov approaches
- Robust control
- Discrete-time systems
- Linear Matrix Inequalities
- Convex optimizations

Research Interest

Passivity and Lyapunov-based stability theory
Convex Optimization via Linear Matrix Inequalities (LMI)
Robust Control via Integral Quadratic Constraint (IQC)
Robust Phase-Locked Loops
Filter and Amplifier designs via Nonlinear Control Theories
Model Predictive Control with input and output constraints
Motor control subject to nonlinearities
Anti-windup Scheme
Multi-input-multi-output (MIMO) control of hybrid and digital systems

Selected Publications

N.S. Ahmad, J.C. Carrasco and W.P. Heath, ”A Less Conservative LMI Condition for Stability of discrete-time systems with Slope-restricted Nonlinearities,” IEEE Transactions on Automatic Control, 2014 (DOI: 10.1109/TAC.2014.2361398).
N.S. Ahmad, W.P. Heath, and G. Li, ”LMI-based Stability Criteria for Discrete-time Lur’e Systems via Lyapunov Approach,” IEEE Transactions on Automatic Control, 2013 (DOI: 10.1109/TAC.2012.2206721).
N.S. Ahmad, J.C. Carrasco and W.P. Heath, ” LMI Searches for discrete-time Zames-Falb multipliers,” Proceedings of the 52nd IEEE Conference on Decision and Control, Firenze, Italy, 10th-13th December 2013.​ (DOI: 10.1109/CDC.2013.6760716)
N.S. Ahmad and W.P. Heath, ” Convex Synthesis of Multivariable Static Discrete-time Anti-windup via the Jury-Lee Criterion,” 9th IFAC Symposium on Nonlinear Control Systems, Toulouse, Italy, Sept 2013.
N.S. Ahmad, J. Carrasco and W.P. Heath, ”Revisited Jury-Lee Criteria for Multivariable Discrete-time Lur’e Systems: Convex LMI Search,” Proceedings of the 51st IEEE Conference on Decision and Control, Maui, Hawaii, USA, 10th-13th December 2012 (DOI: 10.1109/CDC.2012.6426863).
N.S. Ahmad, W.P. Heath, and G. Li, ”Lyapunov functions for generalized discrete-time multivariable Popov criterion,” 18th IFAC World Congress, Milano, Italy, 29th August-2nd September 2011 (DOI:10.3182/20110828-6-IT-1002.00402).
N.S. Ahmad, W.P. Heath, and G. Li, ”Lyapunov functions for discrete-time multivariable Popov criterion with indefinite multipliers,” Proceedings of the 49th IEEE Conference on Decision and Control,    Atlanta, USA, 15th-17th December 2010 (DOI:10.1109/CDC.2010.5717085)
N.S. Ahmad and J. Carrasco, “Convex LMI Approach for Stability of Critically Stable Systems with Slope-restricted Nonlinearities”, 55th IEEE Conference on Decision and Control, to be held in ARIA Resort &  Casino, Las Vegas, USA, December 12-14, 2016 (in press).
N.S. Ahmad and S.J. Abu Bakar, “Phase-Controlled System Design via Mixed Synthesis and Nonlinear Method,” 2016 IEEE Asia Pacific Conference on Circuits & Systems, Jeju, Korea, October 25-28, 2016 (in press).



As Principal Investigator
Fundamental Research Grant Scheme (Ministry of Education)
Robust Control Approach for Critically Stable Systems with Non-monotonic Perturbations via IQC Machinery and Convex Search Algorithms
Duration: Aug 2016-July 2019 (on-going)

Fundamental Research Grant Scheme (Ministry of Education)
Tractable Algorithm for Discrete-time Zames-Falb Multiplier Search: LMI-based Approach
Duration: Dec 2013-Nov 2016 (completed)

Short term Grant (USM)
Lyapunov Method and Multiplier Approach for Lur’e Systems with Linear Matrix Inequality Formulation
Duration: Dec 2014-Oct 2016 (completed)
As Co-researcher

Fundamental Research Grant Scheme (MOE)
Energy Harvesting Impact for Longevity of Portable Sensor Node
Duration: Dec 2014-Nov 2017 (on-going)
Fundamental Research Grant Scheme (MOE)
Formulation of Novel Distributed Adaptive Observer (DAO) Algorithm for multi-agent system with weak inter-agent communication to solve for specific Lyapunov function of Distributed Control System
Duration: June 2014-June 2017 (on-going)
Impact Drill Controller Development
Duration: Nov 2014-Oct 2016 (on-going)
Short term Grant (USM)
Physically Consistent Fast Transient Simulations of Large Linear Circuits using the Latency Insertion Method
Duration: Mar 2014-Mar 2016 (on-going)


(NEW!) Postgraduate Opportunities

I am looking for prospective students to pursue MSc and PhD in control system under the following projects:

1.    Position and velocity control of motors subject to various types of constraints and loads
2.    Robust control strategies for trajectory tracking and path planning with obstacle avoidance
3.    Modelling of multi-input and multi-output systems
4.    Nonlinear methods for robust analysis and design of filters / amplifiers in phase-controlled systems

Funding Opportunities

Local (Malaysian) students wishing to read for an MSc degree (by research) and PhD under my supervision will have the opportunities to receive monthly stipend. Any inquiries, please email your application together with CVs and academic transcripts at Alamat emel ini dilindungi dari Spambot. Anda perlu hidupkan JavaScript untuk melihatnya.