Department of Electrical Engineering
College of Engineering Trivandrum


Faculty Profile

Dr. S. Ushakumari

Professor and Head of Department

Phone: 0471-2515562, 9447477655 (M), 0471 2592072(R)   
Email: ushalal2002@gmail.com

Qualifications

 

B. Tech – Electrical and Electronics Engg. (University of Kerala)
M. Tech – Control Systems (University of Kerala) 
PhD – Drives and Control (University of Kerala)

Area of Interest

 

Control Systems, Robust and Adaptive Control, Electrical Drives, Fuzzy Logic, Microgrid, Load Frequency control, Homopolar induction machine.

Professional Experience

 

Teaching: 29 years 
Research: 16 years 

Recently taught courses

 

Robust Control, Digital Control Systems, Dynamics of Linear Systems, Adaptive Control, Process Control, Control system Engineering, Advanced control theory, Linear control Theory.

PhD Guidance
 

PhD Produced : 5 
PhD submitted : 3 
PhD in progress: 5 

Awards/Recognitions/ Achievements
 

National level: 2  
State level : 3 

Projects undertaken
 
  1. Working as Principal investigator of the DRDO funded project on “Modelling and Anaysis of Homoploar High Speed Alternator for aero space applications” for an amount of Rs. 10.50 lakhs sanctioned in May 2016 (Completed)
  2. Working as Principal investigator of the DRDO funded project on “Energy Harvesting system for Wireless Sensor Networks” for an amount of Rs. 20.60 lakhs (under review)
  3. Working as Principal investigator of the RESPOND project and the project for the development of position control of piezo-electric actuators and sensors for VSSC for an amount of Rs. 19.6 lakhs July 2013-2016 (completed)
  4. Coordinated the project on Real time expert system associated with thermal power plant for CDAC, Thiruvananthapuram for an amount of Rs. 2.00 lakhs (completed in 2013).
  5. Technical expert of the project entitled “Alternate flow regulation system for precision farming” being implemented jointly by CDAC and State Horticulture mission, Kerala (completed in 2014).
  6. A project under MODROB for a sum of Rs. 8.70 lakhs got approved during November 2011 and the project was successfully completed in the year 2012.

Administrative positions held
 
  1. Working as Member of the Board of Studies of the Faculty of Engineering and Technology of University of Kerala
  2. Advisor to Union Public Service Commission (UPSC), New Delhi
  3. Domain Expert of Selection committee of departmental promotion committee of CDAC, Thiruvananthapuram
  4. Member of the Board of Governors of TKM College of Engineering, Kollam
  5. Chairman of the Doctoral committee of TKM College of Engineering, Kollam
  6. External academic auditor of KTU for two self-financing colleges for two consecutive semesters.
  7. Member of selection committee for the post of Assistant Professors in TKM College of Engineering, Kollam
  8. Subject expert of Kerala PSC for the selection of Assistant Engineers to KSEB
  9. Selection committee member of LBS Centre for Science and Technology for the selection of Assistant Professor.
  10. Chairman of the Doctoral committee for the selection of candidates for PhD programme under MG University
  11. Question paper setter for the PhD programme under Kannur University
  12. Worked as Presiding officer of the Internal Complaints Committee of College of Engineering Trivandrum
  13. Professor in charge, Satellite Centre, CERD

Journals being reviewed
 
  1. Elsevier International Journal on Computers and Electrical Engineering (USA).
  2. AMSE International Journal & periodicals, France.
  3. International journal on Engineering (IJE), Iran.
  4. IEEE Transactions on Industrial Electronics
  5. IEEE Transactions on Mechatronics
  6. Springer Journal on Pattern Analysis and Applications.
  7. Elsevier International Journal of the Franklin Institute, Philadelphia.
  8. Asian Journal of Control Wiley Publications

Patents
 

High power geared electric vehicle - 2018

Publications
 
 

 
Journal
Conference
Total

National
2
42
44

International
31
49
80

Total
33
91
124
 

Journals:
 

  1. Sherine Jesna V. A, Winston Netto, S. Ushakumari, “Nonlinear Adaptive Sliding Mode Control of a Rigid Rotor via Contactless Active Bearing”, International Journal of Mechanical Engineering and Robotics Research (IJMERR), Vol. 8, No. 1, January 2019, pp. 52- 58.

  2. Arlene Davidson and Ushakumari S. "Structured H-Infinity controller for an uncertain deregulated power system", IEEE Transactions on Industry Applications, DOI : 10.1109/TIA.2018.2866560, vol.55, no.1, pp. 892-906, Jan 2019.

  3. Jino Joy, Ushakumari S., “Regenerative Braking Mode Operation of a Three-Phase H-Bridge Inverter fed PMBLDC Motor Generator Drive in an Electric Bike,” in Taylor and Francis Journal of Electric Power Components and Systems, ISSN: 1532-5008, vol.0, no.0, Dec 2018, pp 1-20.

  4. Jino Joy, Ushakumari S., “Performance Comparison of a Bridge-less Canonical Switching Cell and H-Bridge Inverter with SVPWM fed PMBLDC Motor Drive under Fuzzy Logic Controller," International journal on Association for Modeling and Simulation for Enterprises (AMSE) (Accepted for publication)

  5. Jino Joy, S. Ushakumari, “Performance comparison of a Canonical Switching Cell with SPWM and SVPWM fed sensorless PMBLDC motor drive under conventional and fuzzy logic controllers," in Elsevier International Journal of the Franklin Institute, vol. 354, Issue 14, pp. 5996-6032, August 2017

  6. Arlene Davidson and Ushakumari S., “H-infinity PID cum RFB Controller for Load Frequency Control of a Deregulated Power System considering the effect of nonlinearities", International journal of Control theory and applications, International Science Press, vol. 10, no. 6, April 2017, pp. 425-433.

  7. Jino Joy, Ushakumari S., “Performance Comparison of a Space Vector Pulse Width Modulated Sensor less PMBLDC Motor Drive with Conventional and Fuzzy Logic Controllers,” International Journal of Power Electronics, vol, pp. , February 2017.

  8. Arlene Davidson and Ushakumari S., “Optimal Load Frequency Controller for a Deregulated Reheat Thermal Power System” in Communication and Power Engineering, De Gruyter, Germany, Book chapter published in February 2017 ISBN -978-3-11-046960-8)

  9. Arlene Davidson and Ushakumari S, “Robust H-infinity loop shaping Controller for Load Frequency Control of an uncertain Deregulated Power System", AMSE Journal – 2016 – series C: Automatic control (Theory an applications) – vol. 71, No.1, pp 39-51, 2016.

  10. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “Torque Capability Improvement of Sensorless FOC Induction Machine in Field Weakening Region for Propulsion Purposes,” communicated for publication in Journal of Computers and Electrical Engineering: Elsevier (Accepted for publication)

  11. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “Effect of Power factor on Torque Capability of FOC Induction Machine in Field Weakening Region for Propulsion Systems,” communicated for publication in Journal of Institution of Engineers (India) Series–B: Springer.  (Accepted for publication)

  12. Hari Kumar R and S Ushakumari, “Comparison of binary optimisation techniques for real-time management of sustainable autonomous microgrid," Springer lecture notes in computer Science, Nov - 2016 ISSN-0302-9743.

  13. Arlene Davidson and Ushakumari S., “H-Infinity Loop Shaping Controller for Load Frequency Control of a Deregulated Power System”, Elsevier Procedia Technology, vol. 25, pp.  775-784 (ISSN 2212-0173 ), Oct - 2016.

  14. Hari Kumar R and S Ushakumari, “A novel architecture for data management and control in autonomous intelligent microgrid," International journal - Elsevier Procedia-Computer Science, vol. 89, pp. 412-421,  Aug - 2016, ISSN:1877-0509.

  15. Ashitha Joy, Jayakumar M. and Ushakumari S., “Modelling and Control of Proton Exchange Membrane Fuel Cell,” International Journal of Control Theory and Applications (IJCTA) no. 8(3), 2015, pp. 1105-1111.

  16. Hari Kumar R. and S. Ushakumari, "Novel Algorithm for Load Shedding and Reconfiguration of Isolated Microgrid," International Journal of Applied Engineering Research (IJAER), vol. 10, no. 1 (2015), pp.1242-1249

  17. Mayadevi N., Vinod Chandra S. S., Ushakumari S, "SCADA Based Operator Support System for Power Plant Equipment Fault Forecasting, "Journal of the Institution of Engineers (India): Series B, Springer, vol.95, issue.3, July 2014, DOI: 10.1007/s40031-014-0117-9

  18. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “Four Quadrant Operation of Field weakened FOC Induction motor Drive Using Sliding Mode Observer”, Transactions on Engineering Technologies, Springer publication, May 2014

  19. Mayadevi N., Vinod Chandra S. S., Ushakumari S., "A Review on Expert System Applications in Power Plants," International Journal on Electrical and Computer Engineering, vol. 4, issue 1, January 2014

  20. V. P. Mini and S. Ushakumari, “Rotor fault Detection and Analysis of three phase Induction Motor using Fuzzy Logic,” AMSE International Journal on modelling, measurement and Simulation (Accepted for publication) 2013

  21. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “Performance Study of Field Oriented Controlled Induction Machine in Field Weakening using SPWM and SVM fed Inverters”, International Review of Modelling and Simulations, vol. 6, no. 3, pp. 741-752, Jun 2013.

  22. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “FFT Analysis for Field Oriented Control of SPWM and SVPWM Inverter fed Induction Machine With and Without Sensor”, International journal of Advanced Electrical Engineering, vol. 2, no. 4, pp. 151-160, June 2013.

  23. Mini V. P. and S. Ushakumari, “Electrical fault detection and diagnosis of induction motor using fuzzy logic”, AMSE International journal on modelling, measurement and simulation, vol. 55, no.1, October 2012

  24. Lekshmi, Dr. R. Sankaran and Dr. S. Ushakumari, “Simulation and DSP Based Real Time Implementation of Closed Loop Variable Speed Operation of a BLDC Motor Drive System”, International Review on Modelling and Simulations, vol.5, no.5, pp. 2026-2035, October 2012.

  25. Madhusoothanan K. R. and S. Ushakumari, “Sliding mode control and fuzzy Logic control of Hydraulic Robot Manipulator”, AMSE journal on modelling, measurement and simulation, vol. 67, no.1, October 2012

  26. G. K. Nisha, S. Ushakumari and Z. V. Lakaparampil, “Online Harmonic Elimination of SVPWM for Three Phase Inverter and a Systematic Method for Practical Implementation”, IAENG International Journal of Computer Science, (IJCS 39:2:10), vol. 39, no. 2, pp. 220-230, May 2012.

  27. Lekshmi, Dr. R. Sankaran and Dr. S. Ushakumari, “Modelling and Simulation of PM Brushless DC Motor Based Spooler Drive System with Speed and Current Feedback”, International Review on Modelling and Simulations, vol.5, no.1, pp. 231-238, February 2012

  28. Lekshmi, R. Sankaran, S. Ushakumari, “Performance Comparison of a Closed Loop PMBLDC Drive System with Hysteresis and Modified Predictive Current Controllers”, AMSE International journal on modelling, measurement and simulation, vol. 84, no. 1, 2011, pp. 73-88.

  29. Juno N., Gopal Jee, Ushakumari S., “H-infinity Controller Design for the Descent Phase of Reusable Launch Vehicle”, AMSE journal on Advances in modelling, vol. 64, no.1-2, 2009.

  30. Sharafunnisa K.H, M. Jayakumar and S. Ushakumari, “Fault detection and Isolation in a Speed Control System using parameter estimation and Fuzzy logic”, AMSE International journal on modelling, measurement and simulation, vol. 82, no 1 -2, 2009.

  31. S. Ushakumari and R. Sankaran, “Development of an advanced controller for improved performance of a PMBLDC Motor”, AMSE Journal on Modelling Measurement and Simulation, France, vol.61, no.2, pp. 34-45, December 2006.

  32. S. Ushakumari and R. Sankaran, “Modelling and Simulation of PMBLDC Motor Drive System covering Steady State Operation and Optimized Controller Design”, AMSE Journal on Modelling Measurement and Simulation, France, vol.40, no.7, pp. 1-22, December 2004.

  33. S. Ushakumari, R. Sankaran and P. S. Chandramohanan Nair, “Closed Loop Performance of a Permanent Magnet Brushless DC Motor Incorporating the Non-Linearity in Torque-Balance Equation (Transient Operation),” International journal of Electric Power Components and Systems, Taylor and Francis, Kentucky, USA, vol. 30, no. 12, December 2002.

 

Conferences:

  
 

  1. Mayadevi N, Harikumar R, S Ushakumari, Mini V P, “A Novel Algorithm for Detection and Diagnosis of Switching Faults of Three Phase Induction Motor Drive System” International Conference on Power Electronics, Drives and Energy Systems Conference (PEDES) 2018, Chennai.

  2. Harikumar R, Mayadevi N, S Ushakumari, Mini V P, “A Laboratory Scale Test-Bed for Demonstrating and Validating Smart Grid Concepts” International Conference on Power Electronics, Drives and Energy Systems Conference (PEDES) 2018, Chennai.

  3. Mithila A K, S Ushakumari, "Design of Robust Sliding Mode and Fuzzy Logic Controllers for Boost and Buck-Boost Converters", IEEE International Conference on Intelligent Computing, Instrumentation and Control Technologies (ICICICT), 2017, Vimal Jyothi Engineering College, Kannur ISBN: 978-1-5090-6106-8

  4. Mithila A K, S Ushakumari, "Comparative Study of Performances of Boost and Buck-Boost Converters with PI and Fuzzy Logic Controllers", 18th National Conference on Technological Trends (NCTT), 2017, College of Engineering Trivandrum.

  5. Anupama V Kumar, Gopal Jee, S. Ushakumari, "Tracking Control Strategy for Air-Breathing Hypersonic Vehicles considering Actuator Dynamics", 18th National Conference on Technological Trends (NCTT), 2017, College of Engineering Trivandrum.

  6. Abhijith M, Shriram S, S Ushakumari, “Landing Algorithm for a Fixed-Wing Unmanned Aerial Vehicle", 18th National Conference on Technological Trends (NCTT), 2017, College of Engineering Trivandrum.

  7. Jino Joy, S. Ushakumari, “Energy Harvestation and Effective Utilization by Regenerative Braking and Motoring Modes of Operation in a PMBLDC Drive System using FLC," in IEEE International Conference on TENSYMP, July 2017

  8. Arlene Davidson and Ushakumari S., “Influence of energy storage system on load frequency control of a deregulated power system with consideration of physical constraints", IEEE - 17th International Conference on Environment and Electrical Engineering 2017 (IEEE-EEEIC 2017), Milan, Italy, pp. 403-408, June 2017.

  9. Jino Joy, S. Ushakumari, “Performance Comparison of a Space Vector Pulse Width Modulated Sensorless PMBLDC Motor Drive with Conventional and Fuzzy Logic Controllers," in International Conference on Contemporary Topics in Power Engineering and Aiding Technologies (ICCPEAT), February 2017

  10. Jino Joy, Ushakumari S., “Performance Comparison of a Canonical Switching Cell Converter fed Sensor less PMBLDC Motor Drive with Conventional and Fuzzy Logic Controllers,” IEEE international Conference on Electrical, Computer and Communication Technologies, vol. 2, pp. 782-790, February 2017.

  11. Arlene Davidson and Ushakumari S, “H-infinity PID cum RFB Controller for Load Frequency Control of a Deregulated Power System considering the effect of nonlinearities", Proceedings of the International conference on sustainable computing techniques in engineering science an dmanagement (SCESM-2017) Belgaum, January 2017

  12. Rani Ashok and S. Ushakumari, "Impact Angle Constrained Missile Guidance Law Accounting Autopilot Lag against Targets with Unknown Acceleration", 17th National Conference on Technological Trends (NCTT-2016), College of Engineering Trivandrum, pp. 937-941, 19-20 August 2016,

  13. Anjana C. Xavier and S. Ushakumari, "Re-entry Guidance of Hypersonic Vehicles" 17th National Conference on Technological Trends (NCTT-2016), College of Engineering Trivandrum, pp. 942-947, 19-20 August 2016,

  14. Jetendra kumar Borra, Soumya N and S. Ushakumari, "Modelling and Control of Attitude Coupled Spacecraft Terminal Phase Rendezvous Using On/Off Thrusters" 17th National Conference on Technological Trends (NCTT-2016), College of Engineering Trivandrum, pp. 1127-1132, 19-20 August 2016,

  15. Arlene Davidson and Ushakumari S., “Structured H-Infinity Controller for an Uncertain Deregulated Power System,” IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems, ICPEICES 2016, 4-6 July 2016, Delhi, pp. 1-5

  16. Jino Joy and Ushakumari S., “Performance Comparison of a Canonical Switching Cell and SVPWM fed Sensorless PMBLDC Motor with Conventional and Fuzzy Logic Controllers” Proceedings of the national conference on Large Scale Multi-disciplinary Systems of National Significance (LAMSYS-2016), pp. 112-118, June 2016 , SDSC SHAR, Sriharikota, India.

  17. Jino Joy, Ushakumari S., “Performance comparison of a sensorless PMBLDC motor drive system with conventional and fuzzy logic controllers", in Proceedings of Elsevier Global Colloquium in Recent Advancement and Effectual Researches in Engineering, Science and Technology (RAEREST), vol. 25, pp. 643-651, April 2016.

  18. Hari Kumar R and S Ushakumari, “Analysis of feed forward phase locked loop and its tuning using PSO," Proceedings of the 8th IET international conference on Power Electronics, Machines and Drives (PEMD-2016), Glasgow, Scotland, UK, 19 – 21 April 2016.

  19. Jino Joy and Ushakumari S., “Performance Comparison of a Sensorless PMBLDC Motor Drive System with Conventional and Fuzzy Logic Controllers”, Global Colloquium on Recent Advancements and Effectual Researches in Engineering, Science and Technology, RAEREST, 22-23 April 2016, Palai, Kottayam.

  20. Arlene Davidson and Ushakumari S., “H-Infinity Loop-Shaping Controller for Load Frequency Control of a Deregulated Power System”, Global Colloquium on Recent Advancements and Effectual Researches in Engineering, Science and Technology, RAEREST, 22-23 April 2016, Palai, Kottayam.

  21. Arlene Davidson and Ushakumari S., “Optimal Load Frequency Controller for a Deregulated Reheat Thermal Power System,” IDES International Conference on Advances in Communication, Network and Computing (CNC 2016), Bangalore, India, March 12 - 13, 2016

  22. Arlene Davidson and Ushakumari S., “H-Infinity Loop-Shaping Controller for Load Frequency Control of an Uncertain Deregulated Power System,” Proceedings of the IEEE International Conference on Electrical, Electronics and Optimization Techniques (ICEEOT 2016), Chennai, March 3 - 5, 2016 (accepted for publication).

  23. Ashitha Joy, Jayakumar M. and Ushakumari S., “Modelling and Control of Proton Exchange Membrane Fuel Cell,” Proceedings of the XII – Control Instrumentation System Conference, Manipal, Karnataka, India, pp. 286- 295, 2 - 4 November, 2015.

  24. Arlene Davidson and S. Ushakumari, “Optimal Load Frequency Controller for a Deregulated Non-Reheat Thermal Power System”, Proceedings of the 3rd IEEE International Conference on Control, Communication and Computing, College of Engineering Trivandrum, Kerala, 19-21, November 2015.

  25. Kesavan M R and S. Ushakumari, “Control of DC/DC Converter connected to MVDC Systems with Constant Power Loads”, Proceedings of 16th National Conference on Technological Trends (NCTT), Trivandrum, pp. 863-868, 09-10 September, 2015.

  26. Kiran Prakash, S. Ushakumari and R. Lethakumari, “Development of Piezoelectric actuator for accurate positioning of cantilever beam”, Proceedings of 16th National Conference on Technological Trends (NCTT), Trivandrum, pp. 873-880, 09-10 September, 2015.

  27. Ashitha Joy, Jayakumar M and S. Ushakumari, “Modelling and control of fuel cell systems”, Proceedings of 16th National Conference on Technological Trends (NCTT), Trivandrum, pp. 918-923, 09-10 September, 2015.

  28. Nobin Paul and S. Ushakumari, “Genetic algorithm based optimization of PWPF modulator parameters for spacecraft attitude control system employing thrusters”, Proceedings of 16th National Conference on Technological Trends (NCTT), Trivandrum, pp. 924-930, 09-10 September, 2015.

  29. Hari Kumar R. and S. Ushakumari, "Analysis of feed forward phase locked loop and its tuning using PSO" (Accepted for presentation in the 8th IET international conference on Power Electronics, Machines and Drives, 19-21 April 2016, The Hilton Hotel, Glasgow, Scotland, UK)

  30. R. Hari Kumar and S. Ushakumari, "A two stage algorithm for optimal management of isolated microgrid," in Proceedings of IEEE International Conference on Signal Processing, Informatics, Communication and Energy Systems (SPICES), 2015, pp.1-5, 19-21 Feb. 2015.

  31. Harikumar R. and S. Ushakumari, “Islanded Micro grid Management using Binary Gravitational Search Algorithm,” 9th International Conference on Intelligent Systems and Control (ISCO’15), Karpagam College of Engineering, Myleripalayam, Coimbatore-641032, Tamilnadu, India, 9-10 January 2015.

  32. Harikumar R. and S. Ushakumari, “Optimal Management of Islanded Microgrid using Binary Particle Swarm Optimization” IEEE International Conference on Advances in Green Energy (ICAGE), Mar Baselios College of Engineering and Technology, Trivandrum, Kerala, 17-18 December 2014, pp. 251 - 257.

  33. Koshy Thomas, Gopal Gee and S. Ushakumari, "Stability Assessment and Control-law Design of Crew-Capsule Module in Re-entry Phase", Proceedings of the 15th National Conference on Technological Trends (NCTT 2014), College of Engineering Trivandrum, Kerala, vol.3, pp.680-687, 22-23 August 2014.

  34. Vishnu N., Harikumar R. and S. Ushakumari, "Design and Control of Renewable Energy Interfaced Grid Connected System", Proceedings of the 15th National Conference on Technological Trends (NCTT 2014), College of Engineering Trivandrum, Kerala, vol.3, pp.720-725, 22-23 August 2014.

  35. Reshma U., Soumya N. and S. Ushakumari, "Comparison of Estimation Techniques for Entry, Descent, and Landing Reconstruction", Proceedings of the 15th National Conference on Technological Trends (NCTT 2014), College of Engineering Trivandrum, Kerala, vol.3, pp.970-976, 22-23 August 2014.

  36. Rajeesh S. K., Lethakumari R. and S. Ushakumari, "Vibration Suppression of Structures using Self Sensing Actuator", Proceedings of the 15th National Conference on Technological Trends (NCTT 2014), College of Engineering Trivandrum, Kerala, vol.3, pp.1001-1007, 22-23 August 2014.

  37. Reema N., Mini V. P. and S. Ushakumari, "Switching Fault Analysis of A Three Phase Induction Motor Drive System", Proceedings of the 15th National Conference on Technological Trends (NCTT 2014), College of Engineering Trivandrum, Kerala, vol.3, pp.1015-1020, 22-23 August 2014.

  38. Ashima C. R., S. Ushakumari and S. Geetha, "Application of Adaptive Back stepping for the Control of a Reusable Launch Vehicle", Proceedings of the 15th National Conference on Technological Trends (NCTT 2014), College of Engineering Trivandrum, Kerala, vol.3, pp.758-764, 22-23 August 2014.

  39. Mayadevi N, Vinod Chandra S. S., Ushakumari S., "Expert System for Power Plant Operator Evaluation, “Proceedings of 4th International Conference on Advances in Computing and Communications - IEEE IACT” pp. 266-269, 26-28 August 2014, Kochi, India.

  40. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “Effect of Leakage inductance on Torque Capability of Field Oriented Controlled Induction Machine in Field Weakening Region”, International Conference on Advances in Engineering and Technology (ICAET’2014), Singapore, 29-30 March 2014.

  41. Hari Kumar R. and S. Ushakumari, “Biogeography Based Tuning of PID Controllers for Load Frequency Control in Microgrid," in Proceedings of the IEEE International Conference on Circuits, Power and Computing Technologies- ICCPCT-2014,  vol. 1, 20-21 March 2014, pp. 797-802

  42. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “Four quadrant operation of sensorless FOC induction machine in field weakening region using MRAS Sliding mode observer”, IEEE International conference on Control Communication and Computing, College of Engineering, Trivandrum, India, vol. 1, pp. 33-38, 13-15 December 2013.

  43. Mayadevi N., Vinod Chandra S. S. and S. Ushakumari, SCADA Based Expert System for Power Plant Operator Training, CCIIS-2013 - International Conference on Computing Cybernetics and Intelligent Information Systems, Nov 2013, Vellur, Tamilnadu, India

  44. Deepak V. Dev, Rani Radhakrishnan and S. Ushakumari, “Fractional Order PID Controller for Attitude Control of Ascent Phase of Reusable Launch Vehicle,” Proceedings of the 14th National Conference on Technological Trends (NCTT -2013), College of Engineering Trivandrum, Kerala, pp. 102-108, August 2013

  45. Deepak V. Dev, S. Ushakumari, “Modified method of tuning for fractional PID controllers,” Third International conference on Power, Control, Signals and Computation (EPSCICON 2014), Vidya Academy, Thrissur, Kerala, January 2014

  46. Santhi E. Skariya, Baby Sebastian and S. Ushakumari, “Integrated Optimal Control of Reusable Launch Vehicle and Actuation System Using Linear Quadratic Regulator Technique,” Proceedings of the 14th National Conference on Technological Trends (NCTT -2013), College of Engineering Trivandrum, Kerala, pp. 66-73, August 2013

  47. T. V. Shyama, S. Ushakumari, “Sensorless Vector Control of Induction Motor based on Model Reference Adaptive System,” Proceedings of the 14th National Conference on Technological Trends (NCTT -2013), College of Engineering Trivandrum, Kerala, pp. 132-137, August 2013

  48. T. V. Shyama and S. Ushakumari, “Vector control of induction motor based on space vector modulation,” Proceedings of the first National Conference on System, Energy and Environment (NCSEE), Govt. College of Engineering, Kannur, pp. 230-235, Aug 2013

  49. Naveen N., Geetha S. and  S. Ushakumari, “Back stepping Control Technique Applied to Discrete Time Systems in Reusable Launch Vehicle,” Proceedings of the 14th National Conference on Technological Trends (NCTT -2013), College of Engineering Trivandrum, Kerala, pp. 233-237,  August 2013

  50. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “Sensorless Field Oriented control of SVM inverter fed Induction Machine in Field Weakening Region using Sliding Mode Observer”. World Congress on Engineering, Imperial College, London, pp. 1174-1181, July 2013.

  51. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “FFT Analysis for Field Oriented Control of SPWM and SVPWM Inverter fed Induction Machine With and Without Sensor”, International conference on Advance Engineering Technology (ICAET’13), Mysore, pp. 34-43, January 2013.

  52. G. K. Nisha, Z. V. Lakaparampil and S. Ushakumari, “Sensorless Vector Control of SVPWM Inverter fed Induction Machine using Sliding Mode”, IEEE International conference on Green Technology (ICGT’12), Thiruvananthapuram, pp. 29-36, December 2012.

  53. G. K. Nisha, S. Ushakumari and Z. V. Lakaparampil, “CFT Based Optimal PWM Strategy for Three Phase Inverter”, IEEE International conference on Power, Control and Embedded Systems, Allahabad, December 2012, pp. 206-211.

  54. V. P Mini and S. Ushakumari “Rotor Fault Analysis of an Induction Motor Using FEM” IEEE International conference on Power, Control and Embedded Systems ICPCES-2012, Allahabad, India, December 2012, pp. 149-155.

  55. Parvathy P., Asha P. Nair and S. Ushakumari, “Nonlinear Inversion via θ-D Control Application to Reusable Launch Vehicle” Proceedings of the 13th National Conference on Technological Trends (NCTT -2012), College of Engineering, Trivandrum, Aug 10-11, 2012, pp. 112-119

  56. Vivek A., Sheelu Jose and S. Ushakumari, “Chattering Free Sliding Mode Control for Re-Usable Launch Vehicle”, Proceedings of the 13th National Conference on Technological trends (NCTT -2012), College of Engineering, Trivandrum, Aug 10-11, 2012, pp. 120-125.

  57. Hema Prathap, V. Brinda and S. Ushakumari, “Robust Flight Control of a Typical RLV during Re-entry Phase”, Proceedings of the 13th National Conference on Technological Trends (NCTT -2012), College of Engineering Trivandrum, Kerala, Aug 10-11, 2012, pp. 155-162.

  58. Sherine Jesna V. A. and S. Ushakumari, “Auto-centering control of three pole Active Magnetic Bearing by Sliding Mode Control” Proceedings of the 13th National Conference on Technological Trends (NCTT -2012), College of Engineering Trivandrum, Kerala, Aug 10-11, 2012, pp. 163-169.

  59. Mayadevi N., S. S. Vinod Chandra and S. Ushakumari, “Failure Forecast Engine for Power Plant Power Plant Expert System Shell”, Proceedings of the IEEE International Conference on ICACCCT, Tamilnadu,  India, 23-25, August  2012, pp. 380-384.

  60. Mayadevi N., S. S. Vinod Chandra and S. Ushakumari, “Learning Engine for Power Plant Expert System Shell”, Proceedings of the IEEE International Conference on Electronics Computer technology (ICECT 2012), Kanyakumari, India, 6-8 April 2012, pp. 284-287.

  61. Nisha G. K., S. Ushakumari, Z. V. Lakaparampil, “Harmonics elimination of space vector modulated three phase inverter”, Proceedings of the international Multi conference of Engineers and computer scientists 2012 (IMECS 2012), Hong Kong, 14-16 March 2012, vol. 2, pp. 1109-1115.

  62. Nisha G. K., S. Ushakumari, Z. V. Lakaparampil, “Method to Eliminate Harmonics in PWM: A Study for Single Phase and Three Phase”, Proceedings of the international emerging technological trends in advanced engineering research (ICETT-2012), Mar Baseleos College of Engineering, Kollam, 21-22 February 2012,

  63. Meera Sivadas, V. R. Lalithambika and S. Ushakumari, “ A Novel Approach to Design of QFT based PID Controller for Launch Vehicle Autopilot”, Proceedings of the 12th National Conference on Technological Trends (NCTT 2011), College of Engineering Trivandrum, Kerala, vol.2, pp. 709-715, 19-20 August 2011.

  64. Praveen S. Babu and S. Ushakumari, “Sliding Mode Based Direct Torque Control of Induction Motor Drives”, Proceedings of the 12th National Conference on Technological Trends (NCTT 2011), College of Engineering Trivandrum, Kerala, vol.2, pp. 760-767, 19-20 August 2011.

  65. Mini V. P and S. Ushakumari, “Incipient Fault detection and diagnosis of an induction motor using fuzzy logic”, Proceedings of the IEEE International Conference on RAICS, Trivandrum, Kerala, pp. 459-464, Jul 2011

  66. Praveen S. Babu and S. Ushakumari, “Direct Torque Control of Induction Motor” Proceedings of the IEEE International Conference on RAICS, Trivandrum, Kerala, pp. 675-681, Jul 2011.

  67. Lekshmi, R. Sankaran and S. Ushakumari, “Performance of a closed loop PMBLDC drive system with modified predictive current controller”, Proceedings of the International Conference on Power, Control and Embedded Systems (ICPCES2010),  Allahabad, pp. 1-6, December 1-3, 2010.

  68. Aswathy Raj, Tessy Elizabeth John and S. Ushakumari, “Adaptive flight control design for aerodynamically controlled launch vehicles” Proceedings of the 11th National and 1st International conference on Technological Trends, vol.3, pp. 877-884, Nov. 2010.

  69. Pradeep Kennedy K., M. Jayakumar and S. Ushakumari, “Detection of sensor faults in an electro hydraulic actuator”, Proceedings of the 11th National and 1st International conference on Technological Trends, vol.3, pp. 916-922, Nov. 2010.

  70. Lekshmisree V., D. Karthikeyan and S. Ushakumari, “Longitudinal aerodynamic parameter estimation of reusable launch vehicle using neural network based algorithm”, Proceedings of the 11th National and 1st International conference on Technological Trends, vol. 3, pp. 901-907, Nov. 2010.

  71. Praveen S. Babu and Dr. S. Ushakumari, “Hybrid Posicast Based Control of Buck Converter” Proceedings of the 11th National and 1st International conference on Technological Trends, vol. 3, pp. 923-927, Nov. 2010.

  72. Mini V.P., Setty Sivakotaiah and S. Ushakumari, “Fault detection and diagnosis of an induction motor using fuzzy logic”, Proceedings of the IEEE Region 8 SIBIRCON 2010, Irkutsk, Russia, pp. 459-464, Jul 2010.

  73. Madhusoothanan K. R. and S. Ushakumari, “Position control of Hydraulic Robot Manipulator with sliding mode control and fuzzy Logic control”, Proceedings of the International Conference on Control, Communication and computing (ICCC 2010), pp. 36 -39, Feb 2010, Kerala, India.

  74. Madhusoothanan K. R. and S. Ushakumari, “Position control of Hydraulic Robot Manipulator using sliding mode control”, Proceedings of the 10th National Conference on Technological Trends (NCTT 2009), College of Engineering Trivandrum, Kerala, vol.3, pp. 18-23 November 2009.

  75. Remya Sukumaran and Dr. S. Ushakumari, “fuzzy Logic and Back stepping Control for an Autonomous Robot, Proceedings of the 9th National Conference on Technological Trends (NCTT 2008), College of Engineering Trivandrum, Kerala, vol.3, pp. 18-23 November 2008.

  76. Lekshmi, Dr. R. Sankaran, Dr. S. Ushakumari, “Comparison of Performance of a Closed Loop PMSM Drive System with Modified Predictive Current and Hysteresis Controllers”, Proceedings of the 11th International Conference on Electrical Machines and Systems (ICEMS 2008), Oct.17-20, 2008, Wuhan, China, pp. 2876-2881.

  77. Lekshmi, R. Sankaran, S. Ushakumari, “Simulation of Space Vector Theory Based Variable Speed Operation of a PMSM Drive System Using Predictive Current Control”, Proceedings of the International conference on Modelling and simulation MS’07, University of Calcutta, India, vol.2, pp. 528 – 532, December 3-5, 2007.

  78. Juno N., Gopal Jee and Dr. S. Ushakumari, “H-infinity control design for descent phase of Reusable Launch Vehicle”, Proceedings of the 8th National Conference on Technological Trends (NCTT 2007), College of Engineering Trivandrum, Kerala, vol.2, pp. 1-6 November - December 2007.

  79. Subha T.G., Vijayamohankumar and Dr. S. Ushakumari, “Design of feedback linearization controller for a re-entry flight control problem”, Proceedings of the 8th National Conference on Technological Trends (NCTT 2007), College of Engineering Trivandrum, Kerala, vol.3, pp. 13-18, November - December 2007.

  80. Sharafunnisa K.H, M. Jayakumar and S. Ushakumari, “Fault detection and Isolation in a Speed Control System using parameter estimation”, Proceedings of the 7th National Conference on Technological Trends (NCTT 2006), College of Engineering Trivandrum, Kerala, vol.3, pp. 7-12, November 2006

  81. Shyju Susan Mathew, Neha Mishra and S. Ushakumari, “System Identification of Servo and Estimation of Slosh States in Launch Vehicle”, Proceedings of the 7th National Conference on Technological Trends (NCTT 2006), College of Engineering Trivandrum, Kerala, vol.3, pp. 1-6, November 2006.

  82. Sheethal Reghunath, S. Ushakumari and A. Lekshmi, “Development of Fuzzy Logic and Neural Network Controllers for a PMBLDC motor”, Proceedings of the 6th National Conference on Technological Trends (NCTT 2005), College of Engineering Trivandrum, Kerala, vol.2, pp. 127-131, November 2005.

  83. V.S.Sreelatha, M.V.Dekhne and S. Ushakumari, “Control of Rotary Pendulum using Linear Quadratic Gaussian Technique”, Proceedings of the 6th National Conference on Technological Trends (NCTT 2005), College of Engineering Trivandrum, Kerala, vol.2, pp. 23-28, November 2005.

  84. S. Ushakumari and R. Sankaran, “Development of an intelligent controller for improved performance of an AVS drive system”, Proceedings of the International Conference on Intelligent Systems and Control (ISC 2005), Massachusetts, USA, pp. 241-246, November. 2005.

  85. K. Jamuna, P.S. Chandramohanan Nair and Dr. S. Ushakumari, “Dynamic performance improvement AGC with advanced controllers and SMES unit”, Proceedings of the National Conference on Recent Trends in Technological Advancement, College of Engineering Trivandrum, Kerala, vol.3, pp. 53-59, November 2004.

  86. M.P. Rijesh and Dr. S. Ushakumari, “Trajectory optimization for re-entry of a reusable launch vehicle”, Proceedings of the National Conference on Recent Trends in Technological Advancement, College of Engineering Trivandrum, Kerala, Kerala, vol.3, pp. 19-25, November 2004.

  87. S. Ushakumari, R. Sankaran and P. S. Chandramohanan Nair, “Steady-state performance of a permanent magnet brushless dc motor incorporating non-linearities,” Proceedings of the 14th Kerala Science Congress - 2002), Cochin University of Science and Technology, Cochin, Kerala, February 2002. pp. 487-491.

  88. S. Ushakumari, R. Sankaran and P. S. Chandramohanan Nair, “Analysis and simulation of open loop and closed loop performance of three phase permanent magnet brushless dc motor drive system,” Proceedings of the International Conference on Energy, Automation and Information Technology (EAIT-2001), IIT Kharagpur, India, December 2001, pp. 263-267.

  89. S. Ushakumari, R. Sankaran and P. S. Chandramohanan Nair, “Adaptive Neuro-fuzzy controller for improved performance of a permanent magnet brushless dc motor,” Proceedings of the 10th IEEE International Conference on Fuzzy systems (FUZZ-IEEE 2001), University of Melbourne, Australia, December 2001, pp. 493-496.

  90. S. Ushakumari, R. Sankaran and P. S. Chandramohanan Nair, “Modelling and simulation of the transient performance of a permanent magnet brushless dc motor drive systems,” Proceedings of the 27th annual Convention and Exhibition of IEEE India Council (IEEE-ACE 2001), New Delhi, India, November 2001, pp. 71-75.

  91. S. Ushakumari, R. Sankaran and P. S. Chandramohanan Nair, “Modelling, analysis and simulation of a three-phase permanent magnet brushless dc motor, considering the non-linearity in torque-balance equation,” Proceedings of the National Conference on Intelligent and Efficient Electrical Systems (NCIEES), PSG College of Technology, Coimbatore, India, January 2001, pp. 211-217.