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«Strengthening the Nation through Diversity, Innovation & Leadership in STEM San Antonio,Texas · October 3-6, 2013 Get Connected! Connect with the ...»

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1 Finding patterns in large volumes of power system data is an important problem as these patterns can inform the operator about system-wide behavior and help in predicting faults. Such patterns are often strongly correlated to notions of effective distance between power substations. Our goal in this project is to develop data analysis methods by which an operator may be able to evaluate how different data sources in a large power grid are correlated with each other and relate them to inter-station distances. Our variables of analysis are voltage and phase-angle measurements lasting for a period of 3 minutes and gathered using phasor measurement units (PMU) from eight, Engineering 500 kV power substations in the western, coastal United States. The data streams are passed through a bandpass filter for noise elimination first and the relative phase angles are computed from the filter outputs. Statistical calculations are then made to determine the least-squares differences of the relative angles and their relationship to respective distances. Other graphs are plotted using different metrics for distance such as the linear distance between substations multiplied by the number of connecting transmission lines. Results thus far have shown that, depending on the fault, linear geographical distance between substations may indeed have a positive correlation to the discrepancies in phase angles. Future work will involve defining new metrics for distances that we can use to tune this correlation to match the variables more accurately.

SAT-278

PREPARATION AND MAGNETIC CHARACTERIZATION OF RU2XZ HEUSLER COMPOUNDS (X=FE, CO, MN;

Z=SI, GE) Juan Castillo, Jason Douglas, Ram Seshadri, PhD.

University of California, Santa Barbara, Santa Barbara, CA.

In this study, we are characterizing the magnetic properties of intermetallic Heusler compounds, with particular focus on the development of ferromagnetic and antiferromagnetic compounds. It has been noted that ferromagnetic and antiferromagnetic compounds that are layered together exhibit a phenomenon known as exchange bias or exchange anisotropy. Possible applications of this phenomenon are permanent magnets and stabilization of recording heads based on anisotropic magnetoresistance. The specific compounds studied are Ru2Fe1-xMnxSi, Ru2Fe1-xMnxGe, and Ru2Co1-xMnxGe with x ≤ 1, all of which exhibit Heusler crystal structures. We prepared these alloys using an arc melter and then annealed the alloys in a furnace to obtain a homogenous phase. We then analyzed the Heusler crystal structures using X-ray diffraction in coalition with optical and scanning electron microscopy. The magnetic properties such as Curie and Neel temperatures, saturation magnetization, and the coercivity are characterized using a superconducting quantum interference device magnetometer. We expect to see an increase in coercivity in the Mn substituted alloys as well as a shift in the Curie and Neel temperature. This study will expand the knowledge of magnetic properties and complex phenomena in Heusler-based materials and in particular provide a better understanding of exchange bias.

FRI-279

MODIFYING THE INTERNAL CONTROL CIRCUITRY OF THE HARVARD APPARATUS MODEL 11 SYRINGE

PUMP TO ALLOW FOR BOTH INFUSION AND WITHDRAWING OF FLUIDS

Edith Rodriguez, Eric Terry.

University of California, Santa Barbara, Santa Barbara, CA.

Syringe pumps are used in scientific and clinical environments to expel (infusion mode) and refill (withdraw mode) fluids from and into a syringe for specific volumes and rates. For example, in clinical environments, syringe pumps can be used to deliver drugs in a well-controlled manner over time, and in scientific experiments, they can be used to move fluids through microfluidic devices at well-defined rates. Syringe pumps that only expel fluids are more common due to their decreased cost when compared to similar syringe pumps that are able to both expel and withdraw.

One such infusion-only syringe pump, the Harvard Apparatus Model 11 was modified to allow for both infusion and withdrawing of fluids by replacing the internal control circuitry with a Texas Instrument MSP430 microcontroller. The modified syringe pump was found to have accuracy and precision comparable to commercially available syringe pumps that have both infusion and withdrawing capability.

187 UNDERGRADUATE POSTER ABSTRACTS

SAT-279

PACKET LOSS PREDICTION FOR A MOTION-CAPTURE (MOCAP) SYSTEM

Owen Dominguez, Gustavo Vejarano.

Loyola Marymount University, Los Angeles, CA.

Reliable wireless communications are important for performing daily life activities because of the increasing amount of electronics that use this technology. Our goal is to develop an affordable and portable motion-capture (mocap) system that uses 3 types of nonoptical sensors: accelerometer, gyroscope, and magnetometer. Such systems have myriad applications, including in the health and sports professions, where individuals such as physical therapists, athletes, and prosthetic professionals require a convenient and reliable record of human movement. While testing our mocap system, we found that the sensors were not able to transmit information without interruption, causing erroneous joint angle calculations due to packet loss. Our current investigation is determining how to predict packet loss, which will improve the accuracy of our measurements. Using a token-passing protocol, sensors attached to the limbs of a person transmit information to a receiver PC, which reconstructs the limbs’ motion in real time. This allows the sensors to take turns for transmission, making it easier to detect when a sensor was not able to transmit successfully.





The inclusion of a packet loss counter and RSSI (received signal strength indicator) in each transmission provides a method of measuring communication performance, enabling us to use algorithmic and mathematical analysis to identify patterns that assist in the prediction of packet loss. Through mocap system testing, we can determine the ability of our algorithms to predict the packet loss. Moreover, to test accuracy, we compare our measurements with those obtained by optical sensors, which are used as a proxy for the true values.

SAT-280

LOW COST ROBOTIC DESIGN AND MANUFACTURING

Josue Cruz-Lambert, Patrick Benavidez, Mo Jamshidi.

University of Texas at San Antonio, San Antonio, TX.

A decade ago, robots were limited to academic research and industrial applications. Now, robots are also available for entertainment and assistant roles in many places including some homes, restaurants, and small manufacturing businesses. Widespread adoption of robots into daily life has yet to happen due to the high cost of robotic components, programming, and testing. We strongly propose that if we design a chassis at a low-enough cost, calculated relative to the electronic systems, robots will be more affordable and readily available in our daily lives. Our design methodology includes the following processes: computer aided design (CAD) of working constraints, testing of functional prototypes, and design machinability consultations with machinists. We first focused on reducing machining and electronic component costs by using commercial off-the-shelf (COTS) parts that met design constraints. Each component was manually dimensioned and CAD models were created using Autodesk Inventor Professional edition.

Using the component models, a set of constraints were developed for functional prototypes. Robot prototypes were developed in-house for testing system performance and design constraints. Consultations with personnel at the university’s machine shop determined the choice of durable low-cost materials and prototype machinability. The final prototype was machined by the university’s machine shop with materials obtained from local and national distributors.

With our process, we demonstrated that we were able to produce a chassis at less than $750. At a cost comparable to that of current mobile computing devices, our robots can be made affordable for a wide array of applications.

SAT-274

TIME-FREQUENCY ANALYSIS OF LINEAR, TIME-INVARIANT COMMUNICATION CHANNELS

Keisha Castillo Torres, Domingo Rodriguez.

University of Puerto Rico at Mayagüez, Mayagüez, PR.

This work centers on the use of signal processing techniques to analyze linear, time-invariant (LTI) systems used as mathematical models for wireless communication channels. Mobile communications channels exhibit a great many distortions due to a diverse number of factors, including time delay effects, frequency delay effects, and multipath aggregation effects. In many cases, the time and frequency delays occur at the same time, creating a condition known as doubly dispersive time-frequency fading. This causes the channels to behave as time varying channels instead of time invariant systems. For certain periods of time, called coherency periods, a linear, time-varying channel may be approximated by a linear, time-invariant channel, which is much easier to model. Our specific work deals with the implementation of time-frequency signal processing algorithms to study mobile communication channels in order to analyze coherency conditions. In particular, we are currently implementing discrete cross-ambiguity function

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algorithms on field programmable gate array computational structures. These algorithms are very useful for studying the input and output signals of a communication channel under a unique common setting.

SAT-272

SIGNAL CORRELATION TECHNIQUES FOR DELAY-DOPPLER ESTIMATION OF UNDERWATER MOVING

OBJECTS Zaylis Zayas-Rivera, Domingo Rodriguez.

University of Puerto Rico at Mayagüez, Mayagüez, PR.

This work deals with the development of acoustic signal correlation algorithms for the estimation of time delay and Doppler frequency parameters of underwater communication signals for linear beamforming applications.

The estimation is performed by sending an acoustic querying or sounding signal, which reaches a target object Engineering and produces a return echo signal. Combined temporal and spectral correlation techniques are performed on the transmitted signal and its echo in order to estimate the desired time delay and Doppler frequency parameters. The time delay parameter is used to estimate how far the object is located relative to the querying signal’s transmitter. The Doppler parameter is used to estimate the object’s speed when moving with constant radial velocity, also, with respect to the querying source signal. Our specific work deals with the hardware implementation of acoustic signal correlation algorithms on field programmable gate array (FPGA) computational structures for the real-time estimation of the delay-Doppler parameters. The discrete cross-ambiguity function is being used to perform correlation techniques between transmitted and received acoustic signals in order to simultaneously compute the time delay and Doppler frequency parameters. This function has been successfully implemented on a Virtex V FPGA unit from the Xilinx Corporation under a system generator development environment.

SAT-276

FPGA FOR TARGET DETECTION IN HYPERSPECTRAL IMAGES

Brenda Diaz, Nayda Santiago, Aida Colon, Daniel Cuevas, Edwin Mercado.

University of Puerto Rico at Mayagüez, Mayagüez, PR.

Field programmable gate arrays (FPGAs) provide high performance, low development cost, and flexibility, making them an appropriate architecture for the implementation of a target detection algorithm. In particular, it may be used to accelerate data acquisition systems. We are working on the implementation of a set of core units using the hardware description language VHDL on FPGAs to implement the Reed-Xioli and matched-filter target detection algorithms. We are currently working on the Spartan FPGA architecture in order to detect desired patters on hyperspectral images. In the long run, the algorithm will be able to detect anomalies in the images provided.

FRI-275

FPGA-BASED IMPLEMENTATION TESTBED FOR MIMO CHANNELS

Amanda Jimenez, Domingo Rodriguez.

University of Puerto Rico at Mayagüez, Mayagüez, PR.

Modern mobile communication systems are using multiple antennas, at both their transmitters and receiver systems, in order to take advantage of their spatial diversity and mitigate in this manner the multipath effect produced when a transmitter signal bounces from many obstacles on its way from the transmitter to a receiver. Each bounce may introduce an additional indirect path for the signal to reach the receiver, with the possibility of introducing time delays and frequency delays that aggregate at the receiver in summative fashion. This results in what is known as the multipath fading problem. Our specific work deals with the implementation of a multiple-input, multiple-output communication (MIMO) channel to serve as a signal testbed for mobile communication systems with multiple antennas. The current MIMO system under implementation consists of 2 transmit antennas and 2 receive antennas.

The implementation is being conducted on field programmable gate array devices to exploit their rapid prototyping tools and fast computational capabilities.

FRI-273

NANOSCALE 3D PRINTING: IN-SITU OPTICAL SPECTROSCOPY

Rosedanny Ortiz, J. Todd Hastings.

University of Puerto Rico at Mayagüez, Mayagüez, PR, 2University of Kentucky, Lexington, KY.

1 This project is part of the steadily growing, world-wide body of nanoscience and nanotechnology research. This project involves the design of a laser absorption spectroscopy system that can measure the solvated electrons

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