Computer Engineering Commons^™

Rotation Of Two-Petal Laser Beams In The Near Field Of A Spiral Microaxicon, S. S. Stafeev, Liam O'Faolain, M. V. Kotlyar

Cappa Publications

Using a spiral microaxicon with the topological charge 2 and NA = 0.6 operating at a 532-nm wavelength and fabricated by electron-beam lithography, we experimentally demonstrate the rotation of a two-petal laser beam in the near field (several micrometers away from the axicon surface). The estimated rotation rate is 55 °/mm and linearly dependent on the on-axis distance, with the theoretical rotation rate being 53 °/mm. The experimentally measured rotation rate is found to be linear and coincident with the simulation results only on the on-axis segment from 1.5 to 3 mm. The experimentally measured rotation rate is 66 °/mm …

Musical Casual Creator For Easy Self-Expression, Louis Lin, Ian Santillano

Computer Science and Engineering Senior Theses

People with autism often struggle with the ability to communicate. As a result, many people with autism become frustrated in their attempts to express their thoughts and feelings fully. Current forms of music therapy are designed to improve the lives of patients with autism, but are inefficient at developing their communication skills. Our project is designed to help music therapy patients express themselves through the creation of music. A patient will be able to “write” a song through the power of his or her feelings. With our system, music therapy patients can actively drive the entire creative process and learn …

Performance Comparison Of Phase Change Materials And Metal-Insulator Transition Materials For Direct Current And Radio Frequency Switching Applications, Protap Mahanta, Mohiuddin Munna, Ronald A. Coutu Jr.

Electrical and Computer Engineering Faculty Research and Publications

Advanced understanding of the physics makes phase change materials (PCM) and metal-insulator transition (MIT) materials great candidates for direct current (DC) and radio frequency (RF) switching applications. In the literature, germanium telluride (GeTe), a PCM, and vanadium dioxide (VO₂), an MIT material have been widely investigated for DC and RF switching applications due to their remarkable contrast in their OFF/ON state resistivity values. In this review, innovations in design, fabrication, and characterization associated with these PCM and MIT material-based RF switches, have been highlighted and critically reviewed from the early stage to the most recent works. We initially …

Towards Optimal Concolic Testing, Xinyu Wang, Jun Sun, Zhenbang Chen, Peixin Zhang, Jingyi Wang, Yun Lin

Research Collection School Of Computing and Information Systems

Concolic testing integrates concrete execution (e.g., random testing) and symbolic execution for test case generation. It is shown to be more cost-effective than random testing or symbolic execution sometimes. A concolic testing strategy is a function which decides when to apply random testing or symbolic execution, and if it is the latter case, which program path to symbolically execute. Many heuristics-based strategies have been proposed. It is still an open problem what is the optimal concolic testing strategy. In this work, we make two contributions towards solving this problem. First, we show the optimal strategy can be defined based on …

Robust Pose Estimation Of A Robotic Navigation Aid For The Visually Impaired By Multimodal Data Fusion, He Zhang

Theses and Dissertations

For a visually impaired individual, it is a challenging task for him/her to plan and follow a path towards the destination. This task is referred to as wayfinding. In this paper, the functions of wayfinding are defined as localization (aka pose estimation) in an indoor environment and finding a way to get to the destination by using the location information. To address this issue, vision-based navigation systems that use a camera for pose estimation have been intensively studied. Several vision-based robotic navigation aids (RNAs) for the visually impaired have been developed. However, these RNAs are not reliable enough to assist …

Genetic Algorithm Amplifier Biasing System (Gaabs): Genetic Algorithm For Biasing On Differential Analog Amplifiers, Sean Whalen

Computer Engineering

Genetic Algorithm Amplifier Biasing System (GAABS) - Senior Project Analysis

Summary of Functional Requirements

This project integrates LTSpice with a python script that runs a genetic algorithm to bias a differential amplifier. The system biases the amplifier with 2 different voltages, the base voltage for the PNP BJTs of the active loads and a voltage controlling the current of the current sink. The project runs via a python script, gets data from LTSpice’s command line call, and iteratively runs until the system is biased to achieve the greatest gain on an arbitrary input voltage.

Primary Constraints

Some of the main …

Machine Learning Models For Context-Aware Recommender Systems, Yogesh Jhamb

Engineering Ph.D. Theses

The mass adoption of the internet has resulted in the exponential growth of products and services on the world wide web. An individual consumer, faced with this data deluge, is expected to make reasonable choices saving time and money. Organizations are facing increased competition, and they are looking for innovative ways to increase revenue and customer loyalty. A business wants to target the right product or service to an individual consumer, and this drives personalized recommendation. Recommender systems, designed to provide personalized recommendations, initially focused only on the user-item interaction. However, these systems evolved to provide a context-aware recommendations. Context-aware …

Enabling Autonomous Navigation For Affordable Scooters, Kaikai Liu, Rajathswaroop Mulky

Faculty Publications

Despite the technical success of existing assistive technologies, for example, electric wheelchairs and scooters, they are still far from effective enough in helping those in need navigate to their destinations in a hassle-free manner. In this paper, we propose to improve the safety and autonomy of navigation by designing a cutting-edge autonomous scooter, thus allowing people with mobility challenges to ambulate independently and safely in possibly unfamiliar surroundings. We focus on indoor navigation scenarios for the autonomous scooter where the current location, maps, and nearby obstacles are unknown. To achieve semi-LiDAR functionality, we leverage the gyros-based pose data to compensate …

The 2018 Nvidia Ai City Challenge, Milind Naphade, Ming-Ching Chang, Anuj Sharma, David Anastasiu, Vamsi Jagarlamudi, Pranamesh Chakraborty, Tingting Huang, Shuo Wang, Ming-Yu Liu, Rama Chellappa, Jenq-Neng Hwang, Siwei Lyu

Faculty Publications

The NVIDIA AI City Challenge has been created to accelerate intelligent video analysis that helps make cities smarter and safer. With millions of traffic video cameras acting as sensors around the world, there is a significant opportunity for real-time and batch analysis of these videos to provide actionable insights. These insights will benefit a wide variety of agencies, from traffic control to public safety. The second edition of the NVIDIA AI City Challenge, being organized as a CVPR workshop, provided a forum to more than 70 academic and industrial research teams to compete and solve real-world problems using traffic camera …

Delegation Application, Erik Matthew Phillips

Computer Science and Software Engineering

Delegation is a cross-platform application to provide smart task distribution to users. In a team environment, the assignment of tasks can be tedious and difficult for management or for users needing to discover a starting place for where to begin with accomplishing tasks. Within a specific team, members possess individual skills within different areas of the team’s responsibilities and specialties, and certain members will be better suited to tackle specific tasks. This project provides a solution, consisting of a smart cross-platform application that allows for teams and individuals to quickly coordinate and delegate tasks assigned to them.

Generalized Featured Product Page, Andrew J. Pirondini

Computer Science and Software Engineering

The goal of my senior project was to generalize the process of creating featured product pages with iFixit. Featured product pages are pages with custom content describing an individual product such as text blurbs, images, and even some responsive components. These do not have a simple template like products you might see on Amazon but instead involve scrolling through a variable amount of content.

In order to generalize these, each part of the page was broken into discrete components that contain custom content. There are components for images, paragraph blurbs, lists, footers and more. These components are implemented with React …

A Survey Of Security Attacks And Defenses In Vehicular Ad-Hoc Networks, Pierson Yieh

Computer Science and Software Engineering

No abstract provided.

Baseball Shagger, Anthony Velasquez, Nick Walker, Nathaniel Kai Paresa

Computer Engineering

The purpose of our project is to allow players to hit baseballs on a baseball field and not have to worry about picking them up. By combining our knowledge of software and hardware, we developed the first design of a robot that “shags” baseballs. Our endeavor was only partially successful. The device was tested on grass, turf, and concrete. The motors did not have enough torque to get moving on grass. The device faired better on turf where it could move, but was quite jerky as the motor drive needed to be high to start moving, but once it was …

Portable High-Definition Audio Spectrum Analyzer, Alex Zahn, Jamie Corr

Electrical Engineering

The Portable High-definition Audio Spectrum Analyzer (PHASA) allows the user to visualize the audio frequency spectrum of an incoming line-level stereo audio signal. Upon pressing the touch screen spectrum graph, the PHASA displays the corresponding frequency and volume levels as well as crosshairs at the touched location. The PHASA features multiple left/right channel display modes— Left channel only, right channel only, both channels simultaneously, and the average between the two channels. The PHASA features multiple resolution display modes (standard-resolution and high-resolution) and multiple dynamics display modes (standard dynamics, averaging, and peak/hold). The PHASA accepts input audio via a 1/4" TRS …

Microgrid Protection Student Laboratory: Human-Machine Interface And Scada Database, Nathan P. Martinez

Electrical Engineering

The electric utility system, a ubiquitous and fundamental component of modern life, has changed more in the last 20 years than the last 100. With more homes and businesses installing distributed energy resources (DERs) such as solar panels, battery storage, and other intermittent sources, massive changes need to take place in the electric transmission and distribution systems. Engineers must develop a new skill set for a modern utility industry. This project summarizes a component for a new laboratory class aimed at power engineering students at Cal Poly which supports the laboratory through the creation of a human-machine interface (HMI) and …

Career Path Web Application, Annamarie Roger

Computer Science and Software Engineering

This web application provides a new approach to organizing career advice. It allows a prospective student to outline career priorities and receive suggestions drawing from a repository of reports from professionals in their respective fields. This gives the student access to advice from individuals who do not know the user personally and aims to remove the possible bias that may exist on that level. Furthermore, the system is periodically updated to include recent reports.

Web Aplikacioni Për Menaxhimin E Eventeve Në Kosovë, Fatlind Dautaj

Theses and Dissertations

Një nga problemet më aktuale në Kosove është informimi rreth eventeve dhe vendeve turistike. Bazuar në këtë fakt, mungesa e informacioneve rreth eventeve dhe vendeve turistike ka bëre që të mos zhvillohet mjaftueshëm turizimi në Kosovë. Meqenëse informimi rreth turizmit deri me tani është bërë përmes broshurave, te cilat nuk mundë të permbanin mjaftushëm informacione, të cilat kishin ndikim jo të mire edhe për ambientin dhe që nuk ishin mjaft te sigurta se informacioni nga ato do të mundë të arrihej te përsonat e interesuar për event.Mirëpo me zhvillimin e këtij web aplikacioni atëherë gjithqka është lehtësuar pasi që informimi …

Data Mining Ancient Script Image Data Using Convolutional Neural Networks, Shruti Daggumati, Peter Revesz

School of Computing: Conference and Workshop Papers

The recent surge in ancient scripts has resulted in huge image libraries of ancient texts. Data mining of the collected images enables the study of the evolution of these ancient scripts. In particular, the origin of the Indus Valley script is highly debated. We use convolutional neural networks to test which Phoenician alphabet letters and Brahmi symbols are closest to the Indus Valley script symbols. Surprisingly, our analysis shows that overall the Phoenician alphabet is much closer than the Brahmi script to the Indus Valley script symbols.

Iot Power Bank And Control System, Dannick Liudzius

Computer Engineering

The project aims to target the growing Internet of Things (IoT) market with a lightweight and cost effective IoT control system with a mobile power bank. Currently there are no easy to use battery-powered systems set-up for Internet of Things interactions. This project is an iteration of such a system that would be able to be installed in a desired home or business environment even if the location is not in reasonable distance from a power outlet. The rapidly expanding IoT market is ideal for the development of a device that can be molded for use with various chosen peripherals, …

Analog Sorting Using Pulse Width Modulation, Riley C. Olson

Computer Engineering

As time goes on, computers become more and more powerful. However, as processing time becomes less of a limiting factor for computing tasks, power consumption takes its place for many tasks. This paper proposes and tests a new method for sorting analog signals. This new sorting method converts analog signals into Pulse Width Modulated(PWM) signals of varying duty cycle , which are then sorted by a simple network of combinational logic, and then converted to a normal binary representation. In order to implement this new method, multiple circuits had to be designed and and tested to ensure their functionality and …