Department of Electrical Engineering

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Start date: 2010End date: 2019

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    GSM Based Monitoring And Control Of Water Pump System
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2013) Ali Yusaf Khan , Saim-U-Dher , Rizwan Jaffar , She; SP09-BTE-014 , SP09-BTE-050 , SP09-BTE-068 , SP09-BTE-074; Miss Arsla Khan
    In this project, we are developing a system that will provide and monitor the functioning parameters of a remotely placed water pump. Sometimes, the user is not present on the actual location of the system. For that, he will have to connect wirelessly with the system. The project is designed to take into account values of temperature and voltage of pump. It also gives the opportunity of controlling the flow of water pumping through the pump. The system will work using GSM technology in which a mobile user will send an SMS to the water pump system and request certain values. The user may also send commands to change the flow of water.
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    PERFORMANCE COMPARISON OF EQUALIZATION TECHNIQUES FOR DSL SYSTEM
    (Library Information Services, COMSATS University Islamabad, Lahore Campus, 2014) Usman Waheed,H.M.Naveed LHR TP 1368; Nabeel Irfan , H.M.Hassan Malik , Sadaf Naureen , Performance Comparison Of Equalization Techniques Madam Arsla Khan LHR TP 4059; FA10-BTE-069 , FA10-BTE-031 , FA10-BTE-089 , FA10-BTE-009; H.M.Asif; LHR TP 1368
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    Hybrid interference mitigation for cognitive small cells in 5G cellular networks /
    (COMSATS University Islamabad Lahore Campus, 2017) Muhammad Usman Iqbal; SP15-PEE-001/LHR; Ejaz Ahmad Ansari, Dr. Supervisor, AP
    I would like to express my deep and sincere gratitude to my Ph.D. supervisor, Dr. Ejaz Ahmad Ansari, Associate Professor, Head ECE Department, CUI Lahore and co supervisor, Dr. Saleem Akhtar, Principal Engineer, CUI Lahore for the opportunity to do research and providing invaluable guidance throughout this research. Their dynamism, vision, sincerity, and motivation have deeply inspired me. It was a great privilege and honour to work and study under their guidance. I am extremely grateful for what they have offered me. I would also like to thank them for their friendship and empathy. I am extremely grateful to my parents for their love, prayers, caring, and sacrifices to educate and prepare me for my future. I am very much thankful to my wife and my children for their love, understanding, prayers and continuing support to complete this research work. I would like to say thanks to my graduate supervisory committee members, Dr. Sobia Baig, Associate Professor, Head Energy Research Center (ERC), CUI Lahore and Dr. Ali Nawaz Khan, Assistant Professor, Department of ECE, CUI Lahore, for their constant encouragement. I express my thanks to Ms. Mayyda Mukhtar, secretary to the graduate committee for her genuine support in documentation throughout Ph.D. I also express my thanks to my cousin, Muhammad Owais Tahir, Research Associate, NCRA Agriculture Robotics Lab, LUMS Lahore, for his support in research work and valuable prayers. Finally, my thanks go to all the people who have supported me to complete the research work directly or indirectly
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    A 3D Accelerometer Based Human Activity Classification
    (COMSATS University Islamabad Lahore Campus, 2018) Aftab Paul,; FA16-REE-009; Contributor(s): Dr. Ali Nawaz Khan, Assistant Profesor [Supervisor]; LHR TP 7475
    Recently, Automated Human Activity Recognition has been extensively used for long term health monitoring of healthy individuals and to provide assisted living for the elderly. Long-term health monitoring systems have been successfully implemented for the prevention of chronic diseases like heart disease, obesity, workers syndrome, and other diseases related to sedentary lifestyle. Activities of Daily Living such as sitting, standing, walking, working in office, jogging, and running etc. can be efficiently classified using sensors such as 3D accelerometers, gyroscopes, and magnetometers. Such systems have demonstrated very high classification accuracies for activities performed for longer durations of time. However, these systems are unable to detect and classify transitory activities where the subject switches from one basic activity to another. For example, if a subject stands up from the chair to walk out of the room and then goes downstairs to reach ground floor of the office building has transitions from stationary sitting to standing and then walking, walking to going downstairs and then walking again and these transitions may not be classified correctly by existing automated human activity recognition systems since the models are trained using nonrealtime segmented data for each individual activity class. This research aims to develop a system for the detection of transitory activities. A Mobile phone-based accelerometer is used to record these activities from the chest of subject through MyNeuroHealth application. Data is collected, pre-processed, and classified into different activity classes. This data is used to train Artificial Neural Network to classify transitory activities. The proposed system achieved an accuracy of more than 50% with real-time data. Furthermore, it is also observed that using two accelerometers for collecting the movement data can enhance classification accuracy to 65%. Given that little or no work has been done in this dimension of HAR, this research may be extended to improve the accuracy of HAR for real-time automated long term health monitoring systems. X
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    Active Fault Tolerant Control Scheme For Dissimil
    (COMSATS University Islamabad Lahore Campus, 2018) Ghazala Mushtaq, FA16-REE-016 Contributor(s): Dr. Mirza Tariq Hamayun, Assistant Profesor [Supervisor]; LHR TP 7474
    The increasing demand of Fault Tolerant Control (FTC) schemes in research is due to reliability and safety needed in industrial systems, especially in life critical systems such as spacecraft, passenger aircrafts, Unmanned Aerial Vehicle (UAV), nuclear and chemical plants. FTC is expected to deal with fault or failure while maintaining the stability and desired performance. It is classified as Passive Fault Tolerant Control (PFTC) and Active Fault Tolerant Control (AFTC). Dissimilar Redundant Actuating Systems (DRAS) are mostly used in modern aircrafts to improve the reliability by evading the Common Mode/Common Cause (CM/CC) failure issue of similar redundant actuating systems. DRAS consists of two actuators i.e. Hydraulic Actuator (HA) and Electro Hydraulic Actuators (EHA). The DRAS are operated in two different modes namely active/active (A/A) mode and Active/Passive (A/P) mode. In A/P mode, the HA actively involve controlling the concerned control surface while the EHA and control surface act as a load to HA while in A/A mode, both actuators are engaged in controlling the control surface at the same time resulting in a force fighting exist between them that can even damage the control surface if the actuators are not synchronized. A lot of research has been carried out on DRAS in different operating modes and a significant contribution has been made to improve its stability. This thesis is about an AFTC scheme for modern aircrafts equipped with DRAS in A/A mode to affirm the reliable actuation and efficient control. The dynamics of both actuators of DRAS are considered that gives the desired control surface deflection. The force fighting issue of actuators being in A/A mode, is also addressed in this research. The effect of fault or failure of HA on system performance is analyzed and an Integral Sliding Mode Controller (ISMC) is designed which together with Control Allocation scheme (CA) improves the system performance at different fault severity level.
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    A Research On Clock-Synchronous Sleep And Wake
    (Publisher COMSATS University Islambad Lahore Campus, 2016) Usama Masood; FA12-MSEE-018; Dr. Ali Nawaz Khan, Assistant Profesor [Supervisor]; LHR TP 6980
    A Research on Clock-Synchronous Sleep and Wake Scheduling Scheme in Wireless Sensor Networks Network Wireless Sensor Network (WSN) consist of a unique set of resources like on-board battery and wireless communication devices with limited bandwidth. WSN offers a wide range of applications for monitoring space or targets. WSN is capable of performing simple processing tasks like tracking, detection of an event, or classification and may consist of multiple nodes that can process the information and communicate with nearby nodes in real-time for environmental monitoring, event detection, surveillance, object tracking, battlefield situation monitoring, and data collection etc. However, there are certain limitations in deploying WSN efficiently such as in terms of limited power resource for a single node in WSN, limited processing capability and varying network life time. It had been shown that wireless communication to and from sensor nodes consumes significantly more battery power in comparison to power expended in sensing, computation and memory access procedures. One of the possible solutions to this problem is to communicate as sparingly as possible through efficient sleep/wake scheduling for WSN nodes to extend node and network lifetime. A major research issue in WSN is to develop an energy efficient MAC protocol that not only provides increase in network lifetime but also addresses latency. In this research, a new MAC protocol is designed using sleep/wake scheduling for WSN. Though energy consumption in WSN is unavoidable due to communication necessity and for different stages like idle listening, retransmission, channel sensing and overhearing; this proposed protocol will help in decreasing this energy consumption. Energy efficiency and latency of the proposed sleep/wake scheduling scheme is evaluated and compared with the state of the art research. An AEL (Accounting for Energy and Latency) factor is introduced which is the deciding element for active and sleep cycles of the node. This said AEL factor defines the minimum duty cycle among the network nodes and is specified prior to nodes deployment depending upon application requirements. In the proposed protocol, the nodes adjust their duty cycles according to this AEL factor depending upon traffic load, their position and their connectivity in the network. The effect of this AEL factor on energy efficiency and delay is evaluated for different network densities in this research thesis. While incorporating sleep/wake scheduling for energy efficiency, delays are added in the network to route packet from node towards sink. Therefore, it is necessary to address latency for MAC protocol especially for delay constrained applications. This research thesis focuses on sleep/wake scheduling scheme ensuring energy efficiency, decreased latency and increased network lifetime by selecting an appropriate AEL value. The research includes the comparison of the proposed protocol with state of the art research and has shown significant percentage improvements in energy efficiency and delay from S-MAC and Anycast protocol
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    Output Feedback FTC Scheme For Linear Parameter
    (Publisher COMSATS University Islambad Lahore Campus, 2016) Izhar Ul Haq; , FA13-MSEE-006; Dr. Mirza Tariq Hamayun, Assistant Profesor [Supervisor]; LHR TP 6820
    The proposed research has been carried out for an Active Fault Tolerant Control (FTC) of Linear Parameter Varying (LPV) systems using output feedback mechanism. Output feedback is a practical approach due to the fact that all the plant states are not accessible or measurable, therefore estimating the unknown states and maintaining the closed loop stability in an LPV framework is closer to the control of nonlinear systems. At the same time, it utilizes the mature nature of linear control theory. In this research, LPV observers in LMI framework have been designed for affine LPV plant, using two different LPV approaches namely affine and polytopic, in order to estimate the unknown states. These estimated states are used as a feedback to LPV controller. Integral sliding mode controller in LPV framework has been designed along with control allocation scheme to control the controlled states as well as to counter for actuators faults and failures. It has been assumed that Fault Detection and Isolation unit, also called FDI, is providing updated actuator faults or failures information to the control allocation (CA) scheme. Detailed performance and stability of the proposed control scheme has been checked in fault-free case, i.e. nominal condition, as well as in the situation when actuator fault occurs. To validate the proposed output feedback FTC mechanism, an LPV model of longitudinal plant of aircraft, taken from the literature, has been considered as a benchmark in the simulation. The simulation results show that the system is quadratically stable and give good tracking capability by the LPV controller-observer pair in nominal as well as in actuator’s fault or failure situation.
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    To Design Hybrid AC-DC Droop Controller For Load
    (Publisher COMSATS University Islambad Lahore Campus, 2019) Ahsan Nadeem,; FA15-REE-001; Dr. Mirza Tariq Hamayun, Assistant Profesor [Supervisor]; LHR TP 6849
    In the 21st century there are several issues with the current electrical power system, such as production of green house gasses and losses (transmission line and conversion losses) that reduced the efficiency of power system. Currently, DC load demand of applications, such as telecom exchange networking system and electric vehicles (EVs) are increasing. In conventional power system, these loads are connected to main grid through converters. Moreover, diesel generators based backup solutions for telecom exchanges have several disadvantages, such as non-reliable starting of generator in cold weather conditions, maintenance of the generator, and exhaustive fumes. Furthermore, in recent times the use of EVs is increasing rapidly and now work place required to have own EV fast charging docking stations; therefore, in our simulation we consider the DC load of employees EVs along with the DC load of telecom exchange. A hybrid AC-DC micro-grid based on distributed generations is proposed as a suitable solution to reduce the multiple reverse conversions within the telecom exchange. For hybrid AC-DC micro-grid, we develop a droop controlled scheme that manage the power flow between AC and DC electrical networks by enforcing the normalized value of frequency equal to the normalized value of voltage of DC micro-grid. The controller provides, need based power sharing between AC and DC grids and enhance operational reliability of the network. The hybrid AC-DC micro-grid presented in this report is an effective solution to eliminate the excessive voltage conversion problem of telecom exchanges along with an efficient fast charging system for the EVs.
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    Model Identification And Control Of A Lab Based
    (Publisher COMSATS University Islambad Lahore Campus, 2018) Anila Barkat,; FA14-REE-011; Dr. Mirza Tariq Hamayun, Assistant Profesor [Supervisor]; LHR TP 6847
    Inverted pendulum control system has vast applications in the field of control system. Every system which is inherently unstable can be controlled like inverted pendulum is controlled. To design a Robust Control system for Inverted pendulum to investigate the behaviour of rapid change in scheduled parameters is aim of this thesis. The designed mechanism has a monitoring and calibrating VI (Virtual Instrument) which is constructed in LabVIEW. This VI send a step input to the inverted pendulum and obtain the transient response of the system from that response system’s model is identified. This model helped in control designing part because model of every system represents its characteristic. Then LPV controller is designed to cater for the parameters variations to enhance the performance and robustness. Moreover, the designed robust controller is implemented on the hardware platform to show its effectiveness. The identified mathematical model is validated by comparing the simulation and real time simulation results with LQR and PID controller.
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    Design Of Hemispherical Antenna For Breast Cancer
    (Publisher COMSATS University Islambad Lahore Campus, 2017) Iqra Asghar,; SP15-REE-005; Dr. Asim Ali Khan, Assistant Profesor [Supervisor]; LHR TP 6824
    Microwave imaging has proven to be successful for medical imaging applications including breast cancer, lungs cancer, brain stroke detection, cardiac imaging etc. Microwave imaging has the ability to detect malignancy present at depth of tissue, providing non-invasive imaging, measuring dielectric contrast between tissues. This imaging procedure provides an effective substitute of mammography, ultrasound or MRI as all these screenings provide unreliable and uncomfortable detection. In this thesis, microwave imaging system has been simulated for breast tumor detection. The designed microwave imaging system includes the use of holographic imaging. For the design of holographic imaging array, two-dimensional (2D) and three-dimensional (3D) breast models have been designed in MATLAB. Holographic array simulations have been carried out in MATLAB. To efficiently reconstruct an image, inverse scattering algorithm has been applied in holography imaging array. The building block of microwave imaging is to design a suitable antenna that must efficiently transmit and receive electromagnetic signals. An efficient compact double layer antenna has been designed in HFSS for the breast malignancy detection system. The antenna provides good impedance matching, wide bandwidth, stable and symmetric radiation pattern for near field imaging. To improve the performance of imaging system, the antenna was simulated in an array configuration. To overcome the drawbacks of array system, a novel array topology has been simulated in HFSS. The designed array system consists of separate transmitters and receivers for imaging, to provide low cost, reliable and effective detecti