Electrical and Computer Engineering Commons^™

Polyenvi, Stephen Beard, Josh Engel, Paul Fake, Diego Flores, Alvaro Nunez, Miguel Wong

Electrical Engineering

Poor indoor air quality is a problem that is recognized by the Environmental Protection Agency (EPA) to cause health issues. In order to raise awareness of this problem, this document outlines the construction of a device that economically measures air quality through five metrics: dust, smoke, ozone, humidity, and temperature. The device integrates with a router to provide users access to information about their indoor air quality anywhere over the internet as well as local access to the data via an LCD mounted on the router. By increasing indoor air quality awareness, this device will aid users in making adjustments …

Ofdm Simulation In Matlab, Paul Guanming Lin

Electrical Engineering

The objective of this project is to demonstrate the concept and feasibility of an OFDM system, and investigate how its performance is changed by varying some of its major parameters. This objective is met by developing a MATLAB program to simulate a basic OFDM system. From the process of this development, the mechanism of an OFDM system can be studied; and with a completed MATLAB program, the characteristics of an OFDM system can be explored.

Power Losses Associated With Stand-By Chargers, Robert Peralta

Electrical Engineering

Many average households across the United States may not realize how much power is saved by simply removing the plug from the receptacle when not being used. A misconception with stand-by/portable chargers is; if a device is not connected to the charger, but the charger is still connected to the wall, then the charger will not consume power. That statement is false. The following report will demonstrate how much power is lost in an average household. When a reference is made to an average house, I will refer to a 4 bedroom single family home. The house will have an …

Electric Bicycle System, Robert Cong, Rodney Martinez, Mark Casilang, Peter Vong

Electrical Engineering

The Electric Bicycle System is a systems project that incorporates three different ways of charging a lithium-ion battery: the 120VAC wall outlet, regenerative braking, and solar power; which is used to power an electric hub motor running a bicycle. The purpose of the project is to show that it is possible and relatively simple, to build an electric bicycle by oneself. This project can be broken down into five separate categories: the lithium-ion battery, the DC-DC boost converter, the solar panel, the motor, and the motor controller. Each of these will be built upon and improved further by future students, …

Transmission Line Forecast Study, Ryan Garoogian

Electrical Engineering

Load forecasting is the procedure to predict future loading conditions on a power system. Using simulation software such as ETAP you are able to predict abnormal voltage conditions, overloading of certain equipment, as well as determine protective equipment from short circuit studies. This study consisted of a 115kV loop network with multiple loading busses and one infinite bus. There was no separate generation other than the infinite bus. As load increased from forecasting to the future voltage dropped. To restore voltage levels capacitors were added at strategic points in the system to boost the voltage back up. Preparing yourself for …

High Voltage Switched-Mode Power Supply For Three-Phase Ac Aircraft Systems, John Brewer Jr., Kamaljit Bagha

Electrical Engineering

The purpose of this senior project was to design and fabricate a proof-of-concept Three-Phase Sinusoidal Switched-Mode Inverter with a power output capability of 10 kW and nominal operating frequency of 400 Hz for AC aircraft system applications. This senior project report includes a thorough discussion and presentation of the inverter system background, requirements, design, construction, and testing processes.

Energy Harvesting From Exercise Machines Cal Poly Recreation Center Implementation, Justin Arakaki, Praveen Lawrence, Audrey Nakamura

Electrical Engineering

As Cal Poly moves towards an environmentally friendly campus, the Energy Harvesting from Exercise Machines (EHFEM) project looks to generate a new source of renewable energy to help power the Cal Poly Recreation Center. The project focuses on retrofitting exercise machines to generate electricity. As of December 2009, Audrey Nakamura, Justin Arakaki, and Praveen Lawrence developed a design which allows the contribution of electricity generated from multiple exercise machines into the power grid.

The project will require an investigation of retrofitted machine designs by Cal Poly students and commercially available products and systems. The information obtained from the product research …

Design Of A High-Low Unipolar Pulse Width Modulated Inverter, Danny Li, Christian Ramos

Electrical Engineering

This senior project report describes the process of designing a unipolar inverter. This high low, unipolar inverter utilizes switches in which a pair operates in high frequency while a second pair operates in low frequency. The purpose of this project is to convert a range of high DC voltage and convert it to an AC output voltage of 120 Vrms with a power rating of 100 W. Nonetheless, this particular unipolar method of implementing pulse width modulation results in harmonics at multiples of the fundamental frequency leading to easier filtering. However, the switching loss increases because of the complex switching …

Energy Harvesting From Exercise Machines: Bike Buck-Boost Converter, Monroe Diamond, Brian Vuong

Electrical Engineering

This project is a continuation of previous senior projects’ work on Energy Harvesting from Exercise Machines (EHFEM). EHFEM seeks an alternative DC to DC converter to function within the existing exercise bike system. Implementing this new DC to DC converter aims to avoid previous complications other groups encountered, such as only running at low load currents, exceeding an input threshold voltage to begin operation, and performing at low efficiency. In developing this self‐generating exercise bike, Cal Poly wishes to incorporate an array of energy‐harvesting exercise machines in its Recreation Center expansion scheduled for completion in 2012.

Quantum Inspired Pso For The Optimization Of Simultaneous Recurrent Neural Networks As Mimo Learning Systems, Bipul Luitel, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

Training a single simultaneous recurrent neural network (SRN) to learn all outputs of a multiple-input-multiple-output (MIMO) system is a difficult problem. a new training algorithm developed from combined concepts of swarm intelligence and quantum principles is presented. the training algorithm is called particle swarm optimization with quantum infusion (PSO-QI). to improve the effectiveness of learning, a two-step learning approach is introduced in the training. the objective of the learning in the first step is to find the optimal set of weights in the SRN considering all output errors. in the second step, the objective is to maximize the learning of …

Adaptive Critics For Dynamic Optimization, Raghavendra V. Kulkarni, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

A novel action-dependent adaptive critic design (ACD) is developed for dynamic optimization. the proposed combination of a particle swarm optimization-Based actor and a neural network critic is demonstrated through dynamic sleep scheduling of wireless sensor motes for wildlife monitoring. the objective of the sleep scheduler is to dynamically adapt the sleep duration to node's battery capacity and movement pattern of animals in its environment in order to obtain snapshots of the animal on its trajectory uniformly. Simulation results show that the sleep time of the node determined by the actor critic yields superior quality of sensory data acquisition and enhanced …

Stochastic Feature Selection With Distributed Feature Spacing For Hyperspectral Data, Jeffrey D. Clark, Michael J. Mendenhall, Gilbert L. Peterson

Faculty Publications

Feature subset selection is a well studied problem in machine learning. One short-coming of many methods is the selection of highly correlated features; a characteristic of hyperspectral data. A novel stochastic feature selection method with three major components is presented. First, we present an optimized feature selection method that maximizes a heuristic using a simulated annealing search which increases the chance of avoiding locally optimum solutions. Second, we exploit local cross correlation pair-wise amongst classes of interest to select suitable features for class discrimination. Third, we adopt the concept of distributed spacing from the multi-objective optimization community to distribute features …

Class-D Power Amplifier, Joseph Maldonado, Jeovany Vega

Electrical Engineering

No abstract provided.

Micro Forest Fire Detection, John Cape

Electrical Engineering

No abstract provided.

An Expandable Micromotor Dc Drive System, Michael Ruelan, Justin Gragg

Electrical Engineering

This report documents the design phases and fabrication of an expandable micro-motor DC drive system. This project illustrates that a flexible range of output power demands can be met from a small DC micro-motor drive unit with the use of power electronics.

In this project miniature DC micromotor drives, each capable of drawing up to 5.5 amps rated current (5 amps due to the utilization of a 5 amp fuse), were designed as card inserts that can be conveniently inserted in parallel in to a cardholder within the console. The “insert” feature allowed our console to successfully draw up to …

Uav Pirates And Silentrack Integration, Travis Dean, Hushnak Singh, Ashley Wager, Matthew (Matt) Woolridge

Electrical Engineering

The integration of the UAV pirating system with the SilenTrack video tracking system will allow the combined system to automatically identify and track a suspicious air vehicle visually as well as identify and decode the RF control signal. Once a threat has been identified, the system will execute an algorithm to associate each control channel with the corresponding flight control surface. Once the control channels have been decoded the user can use a hand held radio controller to maneuver the drone which is now under their command.

Circular Polarized Splatch Antenna, Cynthia Truong

Electrical Engineering

The Splatch Antenna combines excellent performance and cost-effectiveness into an antenna package that can be integrated. The goal of this project is to figure out how to connect two Splatch antennas to realize a Circular Polarized (CP) antenna. The advantage of CP versus linear polarization is that CP eliminates polarization mismatch losses caused by Faraday’s rotation.

Solar Panel Tracker, Andrew Hsing

Electrical Engineering

This project will be a design and implementation of a polar single axis solar panel tracker. It will have a fixed vertical axis and an adjustable horizontal motor controlled axis. This setup is similar to an office swivel chair. The tracker will actively track the sun and change its position accordingly to maximize the energy output. To prevent wasting power by running the motor continuously, the tracker will correct it's position after 2 to 3 degrees of misalignment. The sensors will compare the light intensities of each side and move the panels until the tracker detects equal light on both …

Sign Language Glove, Nicholas Born

Electrical Engineering

Between 500,000 and 2 million Americans use American Sign Language (ASL) as their primary language. As such, a device capable of translating those movements into text would be useful in many areas, such as teaching and the entertainment industry.

The goal of this project was to show that the creation of a glove device that takes in sign language letters, interprets them into the desired characters, and can input those characters into a computer is feasible. I chose to work on this project for many different reasons. One reason is many members of my family know sign language and use …

Improved Rf Power Extraction From 1.55um Ge-On-Soi Pin Photodiodes With Load Impedance Optimization, Andrew L. Huard

Master's Theses

VLSI miniaturization has created the need for high-density, low-cost, monolithically-integrated optical interconnects. High output power photodetectors are needed to directly drive load circuitry, which improves the noise performance and dynamic range of optical communications links by eliminating a post amplifier stage. Elimination of the post amplifier also reduces circuit cost and complexity. A new Si-Ge PIN waveguide photodiode with 31GHz bandwidth and 93% quantum efficiency at 1550nm has been developed by Yin et al., which was fabricated using standard CMOS processes on a Silicon substrate. This thesis demonstrates a method for improving the RF power extraction from these photodiodes by …