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Articles 1 - 12 of 12
Full-Text Articles in Engineering
A Study Of The Regularity Of Autocorrelation Of Manipulation Of Wrist Motion During Eating, Xueting Yu
A Study Of The Regularity Of Autocorrelation Of Manipulation Of Wrist Motion During Eating, Xueting Yu
All Theses
This thesis considers the problem of detecting the eating activities (e.g. meals, snacks) of people by tracking their wrist motion. Our goal is to automatically de- tect the start and end times of eating activities during free-living. It builds upon previous work done by our research group [6] [7] [8] [21]. The detection is done by segmenting data into segments then classifying the segments as EA (eating activity) and NonEA (non-eating activity) using a Bayesian classier. Previous features used in the classier developed by our group included the sum of acceleration, the amount of manipulation, the amount of wrist roll …
A Device To Record Naturally Daily Wrist Motion, Surya Sharma
A Device To Record Naturally Daily Wrist Motion, Surya Sharma
All Theses
We introduce a new device to record and store wrist motion activity data. The motivation to create this device was the fact that this data can be used to detect periods of eating or the number of bites consumed. There is no similar device available in the market. This device uses new components that have been recently introduced to the market, and newer techniques that can be used for low quantity production. The production cost for this device was $52, similar to other fitness trackers on the market. The device was capable of recording wrist motion activity for 24 hours …
Design, Analysis And Implementation Of An Experimental System To Harvest Energy From Atmospheric Temperature Variations Using Ethyl Chloride Filled Bellows, Gibran Ali
All Theses
The increase in global warming and the dwindling supplies of fossil fuels have shifted the focus from traditional to alternate sources of energy. This has resulted in a concerted effort towards finding new energy sources as well as better understanding traditional renewable energy sources such as wind and solar power. In addition to the shift in focus towards alternate energy, the last two decades have offered a dramatic rise in the use of digital technologies such as wireless sensor networks that require small but isolated power supplies. Energy harvesting, a method to gather energy from ambient sources including sunlight, vibrations, …
Numerical Simulation Of The Heat Leakage At The Gasket Region Of Domestic Refrigerators, Feng Gao
Numerical Simulation Of The Heat Leakage At The Gasket Region Of Domestic Refrigerators, Feng Gao
All Theses
Computational Fluid Dynamics (CFD) simulations are performed to investigate the heat loss at the gasket of a standard over/under domestic refrigerator. The study numerically simulates a unique experimental test cell with only the gasket region exposed to the ambient environment and other parts protected by insulation (see picture below). The test cell is cubic with an interior cavity having dimensions 2' x 2' x 2' within which a heating element is placed to create a specified temperature difference. A matching set of door and side panels exposes a 2' width of the gasket region to heat transfer with the surroundings. …
Design And Demonstration Of A Two-Dimentional Test Bed For Uav Controller Evaluation, Ran Huang
Design And Demonstration Of A Two-Dimentional Test Bed For Uav Controller Evaluation, Ran Huang
All Theses
A three degree-of-freedom (DOF) planar test bed for Unmanned Aerial Vehicle (UAV) controller evaluation was built. The test-bed consists of an instrumented tether and an experimental twin-rotor, planar UAV mounted with a one DOF manipulator mounted below the UAV body. The tether was constructed to constrain the UAV under test to motion on the surface of a sphere. Experiments can be conducted through the tether, approximating motion in a vertical plane by a UAV under test. The tether provides the means to measure the position and attitude of the UAV under test. The experimental twin-rotor UAV and one-link on-board manipulator, …
Automatically Measuring Individual Consumption Events During Natural Eating Using A Table Embedded Scale, Ryan Mattfeld
Automatically Measuring Individual Consumption Events During Natural Eating Using A Table Embedded Scale, Ryan Mattfeld
All Theses
This thesis is motivated to improve the tools available for tracking energy intake. The goal of this work is to develop a table-embedded scale capable of measuring the weight of individual consumption events during unrestricted eating. The method was tested on a data set gathered from 276 subjects eating 518 courses consisting of 22,383 marked individual consumption events in a cafeteria environment. Approximately 30% of the consumption events can be detected and weighed. The remaining 70% of the events occur without participants interacting with the scale or when noisy interactions with the scale prevent weight measurement. The relationship between bite …
Design And Simulation Of A Nerve Tracer System For Vagotomy Surgery, Guneet Bedi
Design And Simulation Of A Nerve Tracer System For Vagotomy Surgery, Guneet Bedi
All Theses
The vagus nerve is one of the most important nerves in the human body. It is associated with a plethora of functions one of them being acid secretion inside the stomach to aid in digestion. The cerebrum part of the brain initiates an action potential that is propagated along the vagus nerve to the parietal cells that secrete acid. In some cases, the cerebrum over stimulates the parietal cells leading to excess acid secretion, more than is needed for the digestion process. This excess acid leads to the formation of open sores along the stomach lining called gastric/peptic ulcers. In …
Ultra-Wideband Position Tracking On An Assembly Line, Harikrishnan Ravikrishnan
Ultra-Wideband Position Tracking On An Assembly Line, Harikrishnan Ravikrishnan
All Theses
This works considers the problem of tracking objects on an assembly line using an ultra-wideband (UWB) positioning system. Assembly line tracking can be accomplished using touch sensors that physically detect when an object reaches a given location. Such tracking requires sensors placed throughout the entire assembly line, and only provides readings at the sensor locations. In contrast, UWB position tracking utilizes a set of sensors surrounding the whole area, enabling continuous position tracking with less infrastructure. Similar tracking can be accomplished using radio frequency identication (RFID) sensing, but this only provides readings when the parts are near RFID readers. The …
Inverse Problems Using Reduced Basis Method, Phil Gralla
Inverse Problems Using Reduced Basis Method, Phil Gralla
All Theses
Inverse Problems is a field of great interest for many applications, such as parameter identification and image reconstruction. The underlying models of inverse problems in many applications often involve Partial Differential Equations (PDEs). A Reduced Basis (RB) method for solving PDE based inverse problems is introduced in this thesis. The RB has been rigorously established as an efficient approach for solving PDEs in recent years. In this work, we investigate whether the RB method can be used as a regularization for solving ill-posed and nonlinear inverse problems using iterative methods. We rigorously analyze the RB method and prove convergence of …
Design Of A High Temperature Subsurface Thermal Energy Storage System, Qi Zheng
Design Of A High Temperature Subsurface Thermal Energy Storage System, Qi Zheng
All Theses
Solar thermal energy is taking up increasing proportions of future power generation worldwide. Thermal energy storage technology is a key method for compensating for the inherent intermittency of solar resources and solving the time mismatch between solar energy supply and electricity demand. However, there is currently no cost-effective high-capacity compact storage technology available (Bakker et al., 2008). The goal of this work is to propose a high temperature subsurface thermal energy storage (HSTES) technology and demonstrate its potential energy storage capability by developing a solar-HSTES-electricity generation system. In this work, main elements of the proposed system and their related state-of-art …
Design And Implementation Of A Real-Time Adaptive Oxygen Transfer Rate Estimator, Li Wang
Design And Implementation Of A Real-Time Adaptive Oxygen Transfer Rate Estimator, Li Wang
All Theses
Oxygen transfer rate (OTR) is the most signicant signal for aerobic bioprocess control, since most microbic metabolic activity relies on oxygen consumption. However, accurate estimation of OTR is challenging due to the difficulty of determining uncertain oxygen transfer parameters and system dynamics. This paper presents an adaptive estimator, which incorporates exhaust gas, stir speed and dissolved oxygen measurements, to predict the real-time OTR. The design of this estimator takes into account the headspace dilution effect, off-gas sensor dynamics and uncertain oxygen transfer parameters. Accurate and real-time OTR signal is derived by combining the low latency property of stir speed and …
Analysis And Mitigation Of Impacts Of Plug-In Electric Vehicles On Distribution System During Faults, Himanshu Bihani
Analysis And Mitigation Of Impacts Of Plug-In Electric Vehicles On Distribution System During Faults, Himanshu Bihani
All Theses
With rising concerns for environment, energy security and gasoline prices, penetration of plug-in electric vehicles (PEV) is bound to increase in the distribution system. The load characteristics of the distribution system with PEVs will be considerably different and hence its effects on the system needs to evaluated. Determination of the characteristics of the impacts will help utilities to prepare methodologies in advance to accommodate this new kind of load. Batteries of most of these vehicles will be charged using a single phase power electronic chargers. To study impact of these chargers on distribution system during fault and fault recovery is …