Honors Projects for Engineering

Permanent URI for this collectionhttps://hdl.handle.net/10125/31091

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Now showing 1 - 20 of 26

An Evaluation of the Oahu Transportation Study Land Use Model
(University of Hawaii at Manoa, 2014-01-15) Young, Steven; Bauman, Richard; Engineering
The Oahu Transportation Study (OTS) Land Use Model occupies a central role in transportation planning for the island of Oahu. Developed by Ronald Graybeal of the Center for Real Estate & Urban Economics, University of California, Berkeley, it has been used extensively since its completion in 1967 - from the initial Oahu Transportation Study to the recent Preliminary Engineering Evaluation Program (PEEP) of Honolulu's rapid transit project. Yet, the crucial question of whether or not the model works has never been answered. The model has never been validated. Although the process of validation is necessarily constrained by the availability of actual data to which the model can be checked, it was perhaps the attitude of acceptance in the model as a "black box" that was most responsible for the failure to even attempt validation of the model. This attitude is directly attributable to the lack of documentation of the model. Graybeal authored the only written description of the land use model in its entirety. In it he discussed the basic concept of the model and outlined the equation system of each of the model's submodels: Hotel, Residential, Commercial and Public/Industrial. However, as neither the functional form nor the coefficients of some of the equations are specified, it is at best an overview.
Detector Capabilities of On-Chip Graphene
(University of Hawaii at Manoa, 2014-01-15) Hayashi, Cody; Ordonez, Richard; Engineering
The discovery of graphene production in the past decade has sparked thousands of research projects—and for good reason. Graphene, or mono-layered carbon, possesses many unique characteristics that offer boundless potential. This research aims to develop a better understanding and characterization of graphene’s electrical properties. Graphene has zero bandgap, allowing for high carrier mobility and low noise. In addition, graphene exhibits effective photon-absorption qualities at low frequencies as shown below in Figure 1. These features open an endless array of possibilities for integrated circuits (IC) use. Therefore, in addition to developing a better understanding of graphene, this research aims to incorporate graphene in high sensitivity, low-frequency sensors. An IC that has been used to test the graphene was fabricated in the summer. The low-frequency detector consists of the IC integrated with graphene. The transfer of graphene onto the IC, as well as the testing of the detector device, has been completed over the past two semesters. The experiments thus far have proven graphene’s ability to be incorporated into a low-frequency detector.
A Distributed Wavelength Optical Narrow Band Interference Filter Integratable with Silocon: Designs for Performance Improvements
(University of Hawaii at Manoa, 2014-01-15) Sze, Wah Wai; Engineering
A distributed wavelength optical narrow band interference filter integratable with silicon that give high, homogeneous transmission over the visible spectrum is designed as proposed by Dr. Holm-Kennedy. Filter designs are simulated in this report starting from the most fundamental design to an acceptable design step by step as proposed by Dr. Holm-Kennedy. The final design uses seven thin film layers altogether. For a maximum transmittance of about 50%, the wavelength bandwidth is 20 nm. For a maximum transmittance of about 70%, the bandwidth is 38nm. This design is versatile in that it can be used as it is at 50% maximum transmittance with excellent rejection. Or the disign can be significantly improved by adding additional layers.
An Audible Calculator
(University of Hawaii at Manoa, 2014-01-15) Sumida, Stephen; Engineering
The design of an audible calculator is the topic of this paper. That is, a device which, when given an arithmetic expression via a keyboard, audibly echoes each entry and announces the answer. The basis for the calculator is provided by an Intel 8080 microprocessor controlling a cassette tape player. The calculator 'speaks' by having the microprocessor (and associated logic circuitry) select words from a pre-recorded vocabulary on cassette tape. This calculator turns out to be slightly impractical from the user's point of view. The reason for this is the low rate of feedback; in other words, it is not able to •talk' fast enough. A brief discussion of possible solutions to this problem and other possible improvements is presented.
The Feasibility of Low-Polluting and Non-Polluting Potential Power Sources for Passenger Vehicle Application in Hawaii... a Beginning
(University of Hawaii at Manoa, 2014-01-15) Simmons, Thomas; Engineering
"The Feasibility of Low-Polluting and Non-Polluting Potential Power Sources for Passenger Vehicle Application In Hawaii... A Beginning" is just what the title implies, a beginning. t is to serve as a prelude to determining a solution to the problem of air pollution, to which automotive emissions are among the principal contributors.
Application of IC Implemented Phase-Locked Loop System to Recover Information from Noise
(University of Hawaii at Manoa, 2014-01-15) Scott, Douglas; Engineering
This paper describes the design and operation of a practical IC implemented phase-locked loop system capable of indicating phase changes in a noisy slowly varying DC signal of period, T = 18 sec., by providing a logic compatible square or triangular wave output which is locked in phase with the input signal. The results of tests indicate that the practical PLL system performed satisfactorily under normal operating conditions. The extremely low average phase error of +5 degrees between the noisy input and the PLL output signals, which is well within the desired limit of +/- 10 degrees, indicates the high degree of accuracy made possible with the use of the highly stable IC implemented PLL design. This shows that a practical IC implemented phase-locked loop can be designed and used to accurately track and clean up a low frequency noisying input signal to recover information from noise.
Implementing a Spectrum Analyzer with the 2920 Analog Signal Processor on a Chip
(University of Hawaii at Manoa, 2014-01-15) Sasaki, Galen; Engineering
A spectrum analyzer system that implement Intel Corporationa's 2920 Analog Signal Processor chip will be described. The 2920 is used as a spectrum calculator, where we define a spectrum calculator as a device that generated frequency spectrum data. This data is displayed via a microcomputer system, which houses the 2920. The frequency spectrum is plotted on either the microcomputer's terminal screen or on paper through a printer.
Digital Signal Processing - Realization of General Nth-Order Signal Processors
(University of Hawaii at Manoa, 2014-01-15) Patel, Kirit; Engineering
In this paper, we acutally realize general Nth-order digital processors on two different types of computers. Both of the computers,. one an IBM 360/65 system of the Statistical and Computing Center and the other an HP 2114B (mini-) computer of the Electrical Engineering Department are at the University of Hawaii, Honolulu.
UHC-2, An Educational Micro-Computer
(University of Hawaii at Manoa, 2014-01-15) Pang, Barry; Engineering
Contained in this thesis is a design for a parallel micro-computer of 64 word capacity, 8-bit/word, and with a repertoire of 11 basic in structions (ADD, STORE, BRANCH, PRINT, READ, STOP, CLEAR, COMPLEMENT, SHIFT RIGHT, and two SKIP instructions). The operations SUBTRACT, SHIFT LEFT and other SKIP instructions can be performed with subroutines. The computer is intended to be built by students using commercially availa ble logic modules which will permit a visual display of the UHC-2's in ternal functions during computation. The UHC-2 is composed of Control, Arithmetic, I/0, and Memory units. A detailed design for each section is included.
A Study of WDM (Wavelength Division Multiplexed) Optical Ring Network Routing Algorithms
(University of Hawaii at Manoa, 2014-01-15) Kwan, Mays; Engineering
Efficiency, speed, and bandwidth are very important in the design of networks. Network cables and equipment used in existing networks need to be continuously updated to meet increasing demands. WDM (wavelength division multiplexed) technology is capable of increasing the network efficiency by using existing optical fiber cables and replacing end network equipment. In the development and updating of optical networks network designers need to be concerned with how changes to the configuration affect the efficiency of the network. NetSimulator is a program developed to simulate WDM optical ring networks with various network parameters and routing algorithms. This tool takes the input network parameters, simulates the specified network, and gives the results of network performance. NetSimulator has a set of defined routing algorithms that allow the comparison of algorithms using no wavelength conversion vs. full/ limited wavelength conversion techniques and the use of tunable vs. fix-tuned transmitters in a network. This study will compare the results from Net Simulator to show what parameters and routing algorithms will yield the most efficient WDM optical ring network.
A Study of the Environmental Conditions of Indians in Blaine County, Oklahoma
(University of Hawaii at Manoa, 2014-01-15) Kum, Kenneth; Engineering
Although the American Indian today is the fastest growing minority group in the United States, it was not until 1961 that they were included in any plans for public housing projects. As a result, many of them still live in old log houses, tarpaper shacks, tents, abandoned automobiles, and hillside caves.
The Implementation of a New Method of Determining the Rotational Angle of a Polarization Ellipse for the University of Hawaii Faraday Project
(University of Hawaii at Manoa, 2014-01-15) Kutara, Brian; Engineering
The Faraday Project is a theoretical and experimental research program to study properties of the ionosphere and the relationships of these properties with solar and geophysical phenomena. Experimental data for the study are pre sently being obtained by measuring the total electron content in a cylinder of unit area from Hawaii to a geostationary satellite, ATS-1. The total electron content is obtained from the polarization angle twist of VHF telemetry-carrier transmissions received from the satellite. The signal transmitted from the ATS-1 is linearly-polarized, but the polarizatJon angle of the received signal changes with time because it is rotated by its passage through the electron density of the ionosphere.
An Interactive Algebraic Extension of the APL Programming Language
(University of Hawaii at Manoa, 2014-01-15) Kau, Bruce; Engineering
Symbolic manipulation, as opposed to numerical computation, is a logical extension to many of the scientific pro- gramming languages today. A simple extension to the mathematically oriented programming language APL is described, with a pilot program to implement some basic algebraic features in APL.
The Construction and Evaluation of a Wireless Hearing Aid System
(University of Hawaii at Manoa, 2014-01-15) Kanemori, Raynard; Engineering
The aim of this project was to construct a better body-type hearing aid without the use of cosmetically wia,ppealing wires leading from the transmitter to the receiver. Two kinds of receivers were considered. One was a passive receiver which did not require any batteries while the other was an active one which required a batter,y to power it. The results obtained from this study conclude that the passive system is not feasible at this time while the active system coulc:J be realized with the existing technology.
Design of a Long Period Measuring Electronic Instrument using a Phase-Locked Loop
(University of Hawaii at Manoa, 2014-01-15) Kamikawa, Neil; Engineering
An electronic instrument capable of. measuring the period and the time of arrival of the peak of very long period nearly sinusoidal waveformswas designed. This design consists of an analog phase-locked loop device, which extracts the period in terms of a voltage and a digital counting device which establishes the voltage in a form for display on either an oscilloscope or a chart recorder. Tests show that this prototype instrument is capable of measuring periods between 10 to 300 seconds and also indicate the arrival time of the peak.
Time Coded Modulation
(University of Hawaii at Manoa, 2014-01-15) Lin, Yu Hao; Engineering
A new digital transmission technique for analog signal is studied. It was found that the sample rate and signal to noise ratio are comparable to those of PCM, but it has advantages over PCM in that it requires no complicated A-D and D-A converters used in PCM and it is not affected by slowly varying timing error. From the study, a simple new way of generating wide-band PM and FM signals was found. Also found was a way to construct a nonlinearity whose function- depends on a reference periodic signal.
An Approach to the Economic Distribution of Power
(University of Hawaii at Manoa, 2014-01-15) Lee, Gordon; Engineering
This thesis is concerned with the economic distribution of power in a network. In general, a network consists of several interconnected power stations supplying electrical power to several consumers. The total power requirement can be distributed in many different ways among the operating power stations. An obvious index of efficiency of such a system is the total cost of fuel consumed by the power station to meet their quotas of power. The value of this index will depend on the distribution of power among the stations and their efficiencies. The problea is to minimize this cost while satisfying the consumer's power need. The model takes both the cost of fuel and transmission-line losses into ac count with the capacities of the power stations and the power demand on the system as the constraints.
Hilbert Transform Method of Determining the Period of Rayleigh-Acoustic Wave Generated Ionospheric Doppler Records
(University of Hawaii at Manoa, 2014-01-15) Lau, Chi; Engineering
An ionospheric Doppler record is a faithful representation of the well-dispersed earthquake generated long-period Rayleigh waves. This record displays oscillations with varying periods. In this paper, a method of determining the period of these oscillations is presented. The method consists essentially of determining the analytic signal representation of a Doppler record using Hilbert transform. From the analytic signal representation, the period of an oscillation is obtained by taking the time derivative of the instanteous phase plot of the analytic signal. This method is illustrated by applying it to a Doppler record obtained shortly after the Hachinohe, Japan earthquake of 1968. The results are compared with those obtained by using the traditional "peak and trough" method.
A Static Ward Leonard System
(University of Hawaii at Manoa, 2014-01-15) Lau, Calvin; Engineering
A conventional War Leonard system using a motor-generator set was built to control the speed of a DC motor. Then static control systems using silicon controlled rectifiers were built to control the same moto. Control characteristics for the two cases were studies and compared under both steady state and transient conditions.
Pulse-Forming Network
(University of Hawaii at Manoa, 2014-01-15) Lao, Louis; Engineering
High voltage, high power pulse forming networks, Type A and Type c, are developed to supply pulse voltage and current of the order of kilovolts and hundreds of amperes respectively. It can only be concluded that type A pulse-forming network is more convenient to use than Type C, and that the generation of a trapezoidal pulse requires less circuit elements than the generation of a rectangular pulse.

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