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Electrical and Computer Engineering Commons™
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- Keyword
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- Gallium Nitride (2)
- Automated fish classification (1)
- Coherent detection (1)
- DC–DC voltage converter (1)
- FPGA (1)
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- FPGAs (1)
- FSK (1)
- Grating (1)
- Haar classifiers (1)
- Light-emitting-diode (1)
- Neural network controller (1)
- Neural network hardware (1)
- Non-coherent detection (1)
- Optical injection; Injection-locking; Noise; Semiconductor laser (1)
- Semiconductor laser (1)
- Series loaded resonant (1)
- Super barrier rectifier diodes (1)
- Traffic signal control; ant colony algorithm (1)
- Transverse modes (1)
- Underwater sensor networks (1)
Articles 1 - 29 of 29
Full-Text Articles in Electrical and Computer Engineering
Design And Implementation Of A Neural Network Controller For Real-Time Adaptive Voltage Regulation, Xiao-Hua Yu, Weiming Li, N. F. N. Taufik
Design And Implementation Of A Neural Network Controller For Real-Time Adaptive Voltage Regulation, Xiao-Hua Yu, Weiming Li, N. F. N. Taufik
Electrical Engineering
An adaptive controller based on multi-layer feed-forward neural network is developed for real-time voltage regulation of a class of PSFB (phase-shifted full-bridge) DC–DC converters. The controller has the unique advantages of nonlinear mapping and adaptive learning, and performs well over a wide range of input voltages and output load currents. The controller is implemented and tested in hardware using a DSP (digital signal processor) board. Experimental results show that it outperforms conventional controllers in both line regulation and load regulation.
Design And Implementation Of A Neural Network Controller For Real-Time Adaptive Voltage Regulation, Xiao-Hua Yu, Weiming Li, Taufik
Design And Implementation Of A Neural Network Controller For Real-Time Adaptive Voltage Regulation, Xiao-Hua Yu, Weiming Li, Taufik
Electrical Engineering
An adaptive controller based on multi-layer feed-forward neural network is developed for real-time voltage regulation of a class of PSFB (phase-shifted full-bridge) DC–DC converters. The controller has the unique advantages of nonlinear mapping and adaptive learning, and performs well over a wide range of input voltages and output load currents. The controller is implemented and tested in hardware using a DSP (digital signal processor) board. Experimental results show that it outperforms conventional controllers in both line regulation and load regulation.
Wireless Data Acquisition For Photovoltaic Power System, Makbul Anwari, Arief Hidayat, M. Imran Hamid, Taufik
Wireless Data Acquisition For Photovoltaic Power System, Makbul Anwari, Arief Hidayat, M. Imran Hamid, Taufik
Electrical Engineering
This paper presents a wireless system for monitoring the input and output of the array in a photovoltaic generation plant. The system comprises of sensors, data acquisition system, wireless access point and user computer that enable the users to access the array parameter wirelessly. Description and function of set up equipment are presented as well as the application program that supports the system.
Harmonic Analysis Of Input Current Of Single-Phase Controlled Bridge Rectifier, Michael Mccarty, Taufik, Andre Pratama, Makbul Anwari
Harmonic Analysis Of Input Current Of Single-Phase Controlled Bridge Rectifier, Michael Mccarty, Taufik, Andre Pratama, Makbul Anwari
Electrical Engineering
Harmonic analysis of input current of single phase uncontrolled rectifier is widely known. However, little has been known about harmonic of the input current of single phase controlled or thyristor rectifier. This paper presents such an analysis using the bridge configuration for the controlled rectifier circuit. Results obtained from mathematical derivation, computer simulation, and hardware measurements will also be discussed.
Efficiency Performance Analysis Of Series Loaded Resonant Converter, Michael Mccarty, Taufik, Andre Pratama, Makbul Anwari
Efficiency Performance Analysis Of Series Loaded Resonant Converter, Michael Mccarty, Taufik, Andre Pratama, Makbul Anwari
Electrical Engineering
Series Loaded Resonant (SLR) converter is a well known topology typically used in kilowatt-range power supplies. The topology may operate in either continuous or discontinuous conduction modes whose switching properties are covered in many power electronic text books. However, information related to the actual converter’s efficiency for each conduction mode is lacking and thus will be addressed in this paper. The development of a lab scale SLR converter will be described along with results of computer simulation. Efficiency performance from hardware results for each conduction mode when output power and switching frequency are varied will also be discussed.
Power Quality Analysis Of Grid-Connected Photovoltaic System With Adjustable Speed Drives, M. Anwari, M. Imran Hamid, M.I. M. Rashid, Taufik
Power Quality Analysis Of Grid-Connected Photovoltaic System With Adjustable Speed Drives, M. Anwari, M. Imran Hamid, M.I. M. Rashid, Taufik
Electrical Engineering
This paper presents power quality analysis of a distributed generation system consisting of Photovoltaic (PV)-Inverter system as the renewable source connected to a network of Adjustable Speed Drives (ASDs) as the load. A small-scale laboratory consists of Photovoltaic, Inverter, ASDs and loads system was setup. Two power supplies from PV and grid were connected to two ASDs which powered two separate induction motors. Load of motor 1 was fixed while load of motor 2 was varied. In the experiment, both energy supplies from the grid and photovoltaic system were connected to the loads. Measurements have been done at both side …
Traffic Signal Control With Swarm Intelligence, David Renfrew, Xiao-Hua Yu
Traffic Signal Control With Swarm Intelligence, David Renfrew, Xiao-Hua Yu
Electrical Engineering
Traffic signal control is an effective way to regulate traffic flow to avoid conflict and reduce congestion. The ACO (Ant Colony Optimization) algorithm is an optimization technique based on swarm intelligence. This research investigates the application of ACO to traffic signal control problem. The decentralized, collective, stochastic, and self-organization properties of this algorithm fit well with the nature of traffic networks. Computer simulation results show that this method outperforms the conventional fully actuated control, especially under the condition of high traffic demand.
Electrocardiogram (Ecg) Signal Modeling And Noise Reduction Using Wavelet Neural Networks, Suranai Poungponsri, Xiao-Hua Yu
Electrocardiogram (Ecg) Signal Modeling And Noise Reduction Using Wavelet Neural Networks, Suranai Poungponsri, Xiao-Hua Yu
Electrical Engineering
Electrocardiogram (ECG) signal has been widely used in cardiac pathology to detect heart disease. In this paper, wavelet neural network (WNN) is studied for ECG signal modeling and noise reduction. WNN combines the multi-resolution nature of wavelets and the adaptive learning ability of artificial neural networks, and is trained by a hybrid algorithm that includes the adaptive diversity learning particle swarm optimization (ADLPSO) and the gradient descent optimization. Computer simulation results demonstrate this proposed approach can successfully model the ECG signal and remove high-frequency noise.
I/Q Compensation Of Frequency Dependent Response Mismatch In A Pair Of Analog Low-Pass Filters, Peter Kiss, Vladimir I. Prodanov
I/Q Compensation Of Frequency Dependent Response Mismatch In A Pair Of Analog Low-Pass Filters, Peter Kiss, Vladimir I. Prodanov
Electrical Engineering
Frequency dependent I/Q imbalance in real I/Q filter pairs compensation may be performed using a simple compensation module, placed in the receiver/transmitter chain, with a gain adjustment coefficient and a delay adjustment coefficient. The gain adjustment coefficient may be determined by amplitude measurements conducted at a selected frequency near the center of the band-pass region of the filters. The delay adjustment coefficient may be determined by phase measurements conducted at a selected frequency near the edge of the band-pass region of the filters. Statistical analysis may be used to determine types of real filters that are better suited for the …
Hardware Acceleration Of Multi-View Face Detection, Jungok Cho, Bridget Benson, Ryan Kastner
Hardware Acceleration Of Multi-View Face Detection, Jungok Cho, Bridget Benson, Ryan Kastner
Electrical Engineering
This paper presents a parallelized architecture for hardware acceleration of multi-view face detection. In our architecture, the multi-view face detection system generates rotated image windows and their integral image windows for each classifier which perform parallel classification operations to detect non-upright (rotated) and non-frontal (profile) faces in the images. We use the training data from OpenCV to detect the frontal and profile faces based on the Viola and Jones algorithm. The proposed architecture for multi-view face detection has been designed using Verilog HDL and implemented in a Xilinx Virtex-5 FPGA. Its performance has been measured and compared with a Jones' …
Parallelized Architecture Of Multiple Classifiers For Face Detection, Junguk Cho, B. Benson, S. Mirazaei, R. Kastner
Parallelized Architecture Of Multiple Classifiers For Face Detection, Junguk Cho, B. Benson, S. Mirazaei, R. Kastner
Electrical Engineering
This paper presents a parallelized architecture of multiple classifiers for face detection based on the Viola and Jones object detection method. This method makes use of the AdaBoost algorithm which identifies a sequence of Haar classifiers that indicate the presence of a face. We describe the hardware design techniques including image scaling, integral image generation, pipelined processing of classifiers, and parallel processing of multiple classifiers to accelerate the processing speed of the face detection system. Also we discuss the parallelized architecture which can be scalable for configurable device with variable resources. We implement the proposed architecture in Verilog HDL on …
Bit Error Rate, Power And Area Analysis Of Multiple Fpga Implementations Of Underwater Fsk, Ying Li, Bridget Benson, Ryan Kastner, Xing Zhang
Bit Error Rate, Power And Area Analysis Of Multiple Fpga Implementations Of Underwater Fsk, Ying Li, Bridget Benson, Ryan Kastner, Xing Zhang
Electrical Engineering
There has been an increasing interest in creating short-range, low data-rate underwater wireless sensor networks for scientific marine exploration and monitoring. However, the lack of an inexpensive, low-power, underwater acoustic modem is preventing the proliferation of these sensor networks. Thus, we are building an underwater acoustic modem that considers cost and power at every level, from the analog electronics, to the modulation scheme, to the hardware platform. In this paper, we use reconfigurable devices to explore the design space of our modulation scheme – Frequency Shift Keying (FSK) – to select an implementation that provides the lowest power and area …
Teaching Sustainability In Cal Poly Electrical And Computer Engineering Programs, David Braun, Art Maccarley, John Oliver
Teaching Sustainability In Cal Poly Electrical And Computer Engineering Programs, David Braun, Art Maccarley, John Oliver
Electrical Engineering
No abstract provided.
Mode Pattern Analysis Of Gallium Nitride-Based Laser Diodes, Xiaomin Jin, Sean Jobe, Simeon Trieu, Benafsh Husain, Jason Flickinger, Bei Zhang, Tao Dai, Xiang-Ning Kang, Guo-Yi Zhang
Mode Pattern Analysis Of Gallium Nitride-Based Laser Diodes, Xiaomin Jin, Sean Jobe, Simeon Trieu, Benafsh Husain, Jason Flickinger, Bei Zhang, Tao Dai, Xiang-Ning Kang, Guo-Yi Zhang
Electrical Engineering
In this paper, we present an analysis of gallium nitride (GaN) quantum-well (QW) laser diode (LD) by numerical simulation. Here we discuss three aspects that are crucial to our analysis. First, the transverse mode pattern is studied, and our current GaN diode laser structure is discussed with optical waveguide mode analysis. Then we compare the QW design of the laser and maximize laser modal gain. Finally, we report the influence of the electron block (e-block) layer on lasing performance of our design.
Modeling And Simulation Of Photovoltaic Water Pumping System, Taufik, Akihiro Oi, Makbul Anwari, Mohammad Taufik
Modeling And Simulation Of Photovoltaic Water Pumping System, Taufik, Akihiro Oi, Makbul Anwari, Mohammad Taufik
Electrical Engineering
This paper presents modeling of a simple but efficient photovoltaic water pumping system. The system employs maximum power point tracker (MPPT). Two MPPT algorithms, subsystems and control methods will be modeled and simulated using Matlab and Simulink with actual irradiance data. Simulation results will be presented in terms of performance parameters such as total energy produced and total volume of water pumped per day. The results further validate that MPPT can significantly improve efficiency and performance of PV water pumping system compared to the system without MPPT.
Performance Analysis Of Shunt Reactive Power Compensators, Taufik, Emili Schaefer, Makbul Anwari, Mohammad Taufik
Performance Analysis Of Shunt Reactive Power Compensators, Taufik, Emili Schaefer, Makbul Anwari, Mohammad Taufik
Electrical Engineering
This paper offers comparative solutions for utility companies to solve the problem of voltage flicker in distribution systems. The solutions entail provision of shunt reactive compensation. Two solutions will be explored: the shunt capacitor and the Static VAR Compensator (SVC). Both solutions are modeled and simulated using PSCAD. Results will be compared by analyzing their performance when subjected to changes on the system, and problems that arise when connected to the system.
Modeling And Simulation Of Multiple-Input Converter System With Equally Drawn Source Power, Taufik, Brian Butterfield, Makbul Anwari, Mohammad Taufik
Modeling And Simulation Of Multiple-Input Converter System With Equally Drawn Source Power, Taufik, Brian Butterfield, Makbul Anwari, Mohammad Taufik
Electrical Engineering
This paper presents the modeling of a proposed multiple input, single output converter system for use mainly to interface several renewable energy sources into a single load connection point. More specifically, modeling of a system involving ac and dc supplied to the multiple inputs, single output DC-DC converter will be described and then verified via simulation using OrCAD Pspice to exhibit its functionality. Results of the simulation of one model show the achievement of equally supplied source currents. Details of the modeling and the accompanying computer simulation of the proposed converter will be discussed.
Energy Benefits Of Reconfigurable Hardware For Use In Underwater Sensor Nets, Bridget Benson, Ali Irturk, Junguk Cho, Ryan Kastner
Energy Benefits Of Reconfigurable Hardware For Use In Underwater Sensor Nets, Bridget Benson, Ali Irturk, Junguk Cho, Ryan Kastner
Electrical Engineering
Small, dense underwater sensor networks have the potential to greatly improve undersea environmental and structural monitoring. However, few sensor nets exist because commercially available underwater acoustic modems are too costly and energy inefficient to be practical for this applications. Therefore, when designing an acoustic modem for sensor networks, the designer must optimize for low cost and low energy consumption at every level, from the analog electronics, to the signal processing scheme, to the hardware platform. In this paper we focus on the design choice of hardware platform: digital signal processors, microcontrollers, or reconfigurable hardware, to optimize for energy efficiency while …
Design Simulation Of Top Ito Gratings To Improve Light Transmission For Gallium Nitride Leds, Xiaomin Jin, Simeon Trieu, Fei Wang, Bei Zhang, Tao Dai, Xiangning Kang, Guoyi Zhang
Design Simulation Of Top Ito Gratings To Improve Light Transmission For Gallium Nitride Leds, Xiaomin Jin, Simeon Trieu, Fei Wang, Bei Zhang, Tao Dai, Xiangning Kang, Guoyi Zhang
Electrical Engineering
We present simulation results of the indium tin oxide (ITO) top diffraction grating using a rigorous couple wave analysis (RCWA) for GaN LEDs. We study three different nano-structure patterns: cylindrical pillar grating, conical pillar grating, and cylindrical nano-hole grating. We show the light transmission improvement with nano-grating designs and present design-charts for the nano-hole grating.
Architectural Optimization Of Decomposition Algorithms For Wireless Communication Systems, Ali Irturk, Bridget Benson, Nikolay Laptev, Ryan Kastner
Architectural Optimization Of Decomposition Algorithms For Wireless Communication Systems, Ali Irturk, Bridget Benson, Nikolay Laptev, Ryan Kastner
Electrical Engineering
Matrix decomposition is required in various algorithms used in wireless communication applications. FPGAs strike a balance between ASICs and DSPs, as they have the programmability of software with performance capacity approaching that of a custom hardware implementation. However, FPGA architectures require designers to make a countless number of system, architectural and logic design decisions. By performing design space exploration, a designer can find the optimal device for a specific application, however very few tools exist which can accomplish this task. This paper presents automatic generation and optimization of decomposition methods using a core generator tool, GUSTO, that we developed to …
Ac Technique For Eliminating Phase Ambiguity In Clocking Signals, Vladimir Prodanov, Mihai Banu
Ac Technique For Eliminating Phase Ambiguity In Clocking Signals, Vladimir Prodanov, Mihai Banu
Electrical Engineering
A method involving: distributing two clock signals over a clock signal distribution system; in each of a plurality local clocking regions located along the signal distribution system, detecting the two clock signals and generating therefrom a local clock signal for that local clocking region, wherein the generated local clock signals for at least some of the plurality of local clocking regions are in a first group all of which are aligned in phase with each other and the generated local clock signals for the remainder of the plurality of local clocking regions are in a second group all of which …
Average Time Extraction Circuit For Eliminating Clock Screw, Vladimir I. Prodanov, Mihai Banu
Average Time Extraction Circuit For Eliminating Clock Screw, Vladimir I. Prodanov, Mihai Banu
Electrical Engineering
The method involves detecting a first signal characterized by a periodically occurring first event, detecting a second signal characterized by a periodically occurring second event, and based on both the detected first and second signals, generating a third signal characterized by a periodically occurring third event. The method also involves automatically adjusting the phase of the third signal so that the periodically occurring third event occurs at a predetermined location between the first and second events of the first and second signals.
Field Programmable Gate Array (Fpga) Based Fish Detection Using Haar Classifiers, Bridget Benson, Junguk Cho, Deborah Goshorn, Ryan Kastner
Field Programmable Gate Array (Fpga) Based Fish Detection Using Haar Classifiers, Bridget Benson, Junguk Cho, Deborah Goshorn, Ryan Kastner
Electrical Engineering
The quantification of abundance, size, and distribution of fish is critical to properly manage and protect marine ecosystems and regulate marine fisheries. Currently, fish surveys are conducted using fish tagging, scientific diving, and/or capture and release methods (i.e., net trawls), methods that are both costly and time consuming. Therefore, providing an automated way to conduct fish surveys could provide a real benefit to marine managers. In order to provide automated fish counts and classification we propose an automated fish species classification system using computer vision. This computer vision system can count and classify fish found in underwater video images using …
Light Extraction Improvement Of Gan-Based Light Emitting Diodes Using Patterned Undoped Gan Bottom Reflection Gratings, Simeon Trieu, Xiaomin Jin, Bei Zhang, Tao Dai, Kui Bao, Xiang-Ning Kang, Guo-Yi Zhang
Light Extraction Improvement Of Gan-Based Light Emitting Diodes Using Patterned Undoped Gan Bottom Reflection Gratings, Simeon Trieu, Xiaomin Jin, Bei Zhang, Tao Dai, Kui Bao, Xiang-Ning Kang, Guo-Yi Zhang
Electrical Engineering
The Gallium Nitride (GaN) Light-Emitting-Diode (LED) bottom refection grating simulation and results are presented. A microstructure GaN bottom grating, either conical holes or cylindrical holes, was calculated and compared with the non-grating (flat) case. A time monitor was also placed just above the top of the LED to measure both time and power output from the top of the LED. Many different scenarios were simulated by sweeping three parameters that affected the structure of the micro-structure grating: unit cell period (A) from 1 to 6 microns, unit cell width (w) from 1 to 6 microns, and …
Experimental Harmonic Analysis Of A Network Of Adjustable Speed Drives, Makbul Anwari, M.I. M. Rashid, M. Imran Hamid, Taufik
Experimental Harmonic Analysis Of A Network Of Adjustable Speed Drives, Makbul Anwari, M.I. M. Rashid, M. Imran Hamid, Taufik
Electrical Engineering
Harmonic analysis of a network of Adjustable Speed Drives (ASDs) has been experimentally investigated. A small-scale laboratory of the network of two ASDs connected to two induction motors was setup. Load of motor 1 was fixed while load of motor 2 was varied. In the experiment, measurements have been done at both side of power transformer to analyze power system harmonic.
Performance Study Of Series Loaded Resonant Converter Using Super Barrier Rectifiers, Taufik, Michael Mccarthy, Scott Watkins, Makbul Anwari
Performance Study Of Series Loaded Resonant Converter Using Super Barrier Rectifiers, Taufik, Michael Mccarthy, Scott Watkins, Makbul Anwari
Electrical Engineering
In power electronics efficiency improvement is constantly being sought out through venues such as improved topologies or improved devices. Series loaded resonant (SLR) DC-DC converter is a type of soft-switching topology widely known for providing improved efficiency. This paper investigates the efficiency and transient performance of SLR when a new type of diode called Super Barrier RectifierTM is being used. The design of SLR, results from computer simulations, and hardware measurements will be discussed. The efficiency measurements from all conduction modes in SLR using three types of diodes (pn, schottky, and SBR) will be presented along with transient study …
Face And Lip Tracking In Unconstrained Imagery For Improved Automatic Speech Recognition, Brandon Crow, Jane Zhang
Face And Lip Tracking In Unconstrained Imagery For Improved Automatic Speech Recognition, Brandon Crow, Jane Zhang
Electrical Engineering
When combined with acoustical speech information, visual speech information (lip movement) significantly improves Automatic Speech Recognition (ASR) in acoustically noisy environments. Previous research has demonstrated that visual modality is a viable tool for identifying speech. However, the visual information has yet to become utilized in mainstream ASR systems due to the difficulty in accurately tracking lips in real-world conditions. This paper presents our current progress in tracking face and lips in visually challenging environments. Findings suggest the mean shift algorithm performs poorly for small regions, in this case the lips, but it achieves near 80% accuracy for facial tracking.
Relative Intensity Noise Study In The Injection-Locked Integrated Electroabsorption Modulator-Lasers, Xiaomin Jin, Bennet Yun Tarng, Shun-Lien Chuang
Relative Intensity Noise Study In The Injection-Locked Integrated Electroabsorption Modulator-Lasers, Xiaomin Jin, Bennet Yun Tarng, Shun-Lien Chuang
Electrical Engineering
We present a comprehensive analytical theoretical model for the relative intensity noise (RIN) spectrum of integrated semiconductor quantum-well (QW) lasers under injection-locking. We use a novel setup by employing an integrated electroabsorption modulator-laser (EML) to measure the RIN of the injection-locked distributed feedback (DFB) laser, where the modulator section is used as a photodetector. The EML has an anti-reflection coating on the laser side, so that an injection light from an external master laser can be coupled effectively into the laser section. This scheme simplifies the setup and reduces the alignment loss between discrete optical components. Experimental data indicates that …
Performance Study Of Series Loaded Resonant Converter Using Super Barrier Rectifiers, Taufik, Michael Mccarthy, Scott Watkins, Makbul Anwari
Performance Study Of Series Loaded Resonant Converter Using Super Barrier Rectifiers, Taufik, Michael Mccarthy, Scott Watkins, Makbul Anwari
Electrical Engineering
In power electronics efficiency improvement is constantly being sought out through venues such as improved topologies or improved devices. Series loaded resonant (SLR) DC-DC converter is a type of soft-switching topology widely known for providing improved efficiency. This paper investigates the efficiency and transient performance of SLR when a new type of diode called Super Barrier RectifierTM is being used. The design of SLR, results from computer simulations, and hardware measurements will be discussed. The efficiency measurements from all conduction modes in SLR using three types of diodes (pn, schottky, and SBR) will be presented along with transient study of …