Matching Items (5)
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- All Subjects: wireless
- Creators: Gupta, Sandeep
- Creators: Tsow, Tsing
- Member of: Theses and Dissertations
Description
The accurate and fast determination of carbon dioxide (CO2) levels is critical for many health and environmental applications. For example, the analysis of CO2 levels in exhaled breath allows for the evaluation of systemic metabolism, perfusion, and ventilation, and provides the doctors and patients with a non-invasive and simple method to predict the presence and severity of asthma, and Chronic Obstructive Pulmonary Disease (COPD). Similarly, the monitoring of CO2 levels in the atmosphere allows for assessment of indoor air quality (IAQ) as the indoor CO2 levels have been proved to be associated with increased prevalence of certain mucous membrane and respiratory sick building syndrome (SBS) symptoms. A pocket-sized CO2 analyzer has been developed for real-time analysis of breath CO2 and environmental CO2. This CO2 analyzer is designed to comprise two key components including a fluidic system for efficient gas sample delivery and a colorimetric detection unit integrated into the fluidic system. The CO2 levels in the gas samples are determined by a disposable colorimetric sensor chip. The sensor chip is a novel composite based sensor that has been optimized to provide fast and reversible response to CO2 over a wide concentration range, covering the needs of both environmental and health applications. The sensor is immune to the presence of various interfering gases in ambient or expired air. The performance of the sensor in real-time breath-by-breath analysis has also been validated by a commercial CO2 detector. Furthermore, a 3D model was created to simulate fluid dynamics of breath and chemical reactions for CO2 assessment to achieve overall understanding of the breath CO2 detection process and further optimization of the device.
ContributorsZhao, Di (Author) / Forzani, Erica S (Thesis advisor) / Lin, Jerry Ys (Committee member) / Torres, Cesar (Committee member) / Tsow, Tsing (Committee member) / Xian, Xiaojun (Committee member) / Arizona State University (Publisher)
Created2014
Description
Monitoring of air pollutants is critical for many applications and studies. In
order to access air pollutants with high spatial and temporal resolutions, it is
necessary to develop an affordable, small size and weight, low power, high
sensitivity and selectivity, and wireless enable device that can provide real time
monitoring of air pollutants. Three different kind of such devices are presented, they
are targeting environmental pollutants such as volatile organic components (VOCs),
nitrogen dioxide (NO2) and ozone. These devices employ innovative detection
methods, such as quartz crystal tuning fork coated with molecularly imprinted
polymer and chemical reaction induced color change colorimetric sensing. These
portable devices are validated using the gold standards in the laboratory, and their
functionality and capability are proved during the field tests, make them great tools
for various air quality monitoring applications.
order to access air pollutants with high spatial and temporal resolutions, it is
necessary to develop an affordable, small size and weight, low power, high
sensitivity and selectivity, and wireless enable device that can provide real time
monitoring of air pollutants. Three different kind of such devices are presented, they
are targeting environmental pollutants such as volatile organic components (VOCs),
nitrogen dioxide (NO2) and ozone. These devices employ innovative detection
methods, such as quartz crystal tuning fork coated with molecularly imprinted
polymer and chemical reaction induced color change colorimetric sensing. These
portable devices are validated using the gold standards in the laboratory, and their
functionality and capability are proved during the field tests, make them great tools
for various air quality monitoring applications.
ContributorsChen, Cheng, Ph.D (Author) / Tao, Nongjian (Thesis advisor) / Kiaei, Sayfe (Committee member) / Zhang, Yanchao (Committee member) / Tsow, Tsing (Committee member) / Arizona State University (Publisher)
Created2014
Description
\English is a programming language, a method of allowing programmers to write instructions such that a computer may understand and execute said instructions in the form of a program. Though many programming languages exist, this particular language is designed for ease of development and heavy optimizability in ways that no other programming language is. Building on the principles of Assembly level efficiency, referential integrity, and high order functionality, this language is able to produce extremely efficient code; meanwhile, programmatically defined English-based reusable syntax and a strong, static type system make \English easier to read and write than many existing programming languages. Its generalization of all language structures and components to operators leaves the language syntax open to project-specific syntactical structuring, making it more easily applicable in more cases. The thesis project requirements came in three parts: a compiler to compile \English code into NASM Assembly to produce a final program product; a standard library to define many of the basic operations of the language, including the creation of lists; and C translation library that would utilize \English properties to compile C code using the \English compiler. Though designed and partially coded, the compiler remains incomplete. The standard library, C translation library, and design of the language were completed. Additional tools regarding the language design and implementation were also created, including a Gedit syntax highlighting configuration file; usage documentation describing in a tutorial style the basic usage of the language; and more. Though the thesis project itself may be complete, the \English project will continue in order to produce a new language capable of the abilities possible with the design of this language.
ContributorsDavey, Connor (Author) / Gupta, Sandeep (Thesis director) / Bazzi, Rida (Committee member) / Calliss, Debra (Committee member) / Barrett, The Honors College (Contributor)
Created2016-05
Description
Wardriving is when prospective malicious hackers drive with a portable computer to sniff out and map potentially vulnerable networks. With the advent of smart homes and other Internet of Things devices, this poses the possibility of more unsecure targets. The hardware available to the public has also miniaturized and gotten more powerful. One no longer needs to carry a complete laptop to carry out network mapping. With this miniaturization and greater popularity of quadcopter technology, the two can be combined to create a more efficient wardriving setup in a potentially more target-rich environment. Thus, we set out to create a prototype as a proof of concept of this combination. By creating a bracket for a Raspberry Pi to be mounted to a drone with other wireless sniffing equipment, we demonstrate that one can use various off the shelf components to create a powerful network detection device.
In this write up, we also outline some of the challenges encountered by combining these two technologies, as well as the solutions to those challenges. Adding payload weight to drones that are not initially designed for it causes detrimental effects to various characteristics such as flight behavior and power consumption. Less computing power is available due to the miniaturization that must take place for a drone-mounted solution. Communication between the miniature computer and a ground control computer is also essential in overall system operation. Below, we highlight solutions to these various problems as well as improvements that can be implemented for maximum system effectiveness.
ContributorsHer, Zachary (Author) / Walker, Elizabeth (Co-author) / Gupta, Sandeep (Thesis director) / Wang, Ruoyu (Committee member) / Barrett, The Honors College (Contributor) / Computer Science and Engineering Program (Contributor)
Created2022-05
Description
Wardriving is when prospective malicious hackers drive with a portable computer to sniff out and map potentially vulnerable networks. With the advent of smart homes and other Internet of Things devices, this poses the possibility of more unsecure targets. The hardware available to the public has also miniaturized and gotten more powerful. One no longer needs to carry a complete laptop to carry out network mapping. With this miniaturization and greater popularity of quadcopter technology, the two can be combined to create a more efficient wardriving setup in a potentially more target-rich environment. Thus, we set out to create a prototype as a proof of concept of this combination. By creating a bracket for a Raspberry Pi to be mounted to a drone with other wireless sniffing equipment, we demonstrate that one can use various off the shelf components to create a powerful network detection device. In this write up, we also outline some of the challenges encountered by combining these two technologies, as well as the solutions to those challenges. Adding payload weight to drones that are not initially designed for it causes detrimental effects to various characteristics such as flight behavior and power consumption. Less computing power is available due to the miniaturization that must take place for a drone-mounted solution. Communication between the miniature computer and a ground control computer is also essential in overall system operation. Below, we highlight solutions to these various problems as well as improvements that can be implemented for maximum system effectiveness.
ContributorsWalker, Elizabeth (Author) / Her, Zachary (Co-author) / Gupta, Sandeep (Thesis director) / Wang, Ruoyu (Committee member) / Barrett, The Honors College (Contributor) / Mechanical and Aerospace Engineering Program (Contributor)
Created2022-05