Browsing by Author "Hogan, Justin Allan"

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Multi-spectral imaging of vegetation for CO 2 leak detection
(Montana State University - Bozeman, College of Engineering, 2011) Hogan, Justin Allan; Chairperson, Graduate Committee: Joseph A. Shaw
Though its status as a crisis situation remains the subject of much debate [1,2] there does exist evidence that global warming is a real phenomenon [3] and that its processes are to some degree enhanced by anthropogenically introduced greenhouse gases, perhaps most notably carbon dioxide (CO 2) [3]. This claim is backed by observations of increasing atmospheric CO 2 concentrations from nearly 280-ppm around 1750 to 360 ppm in 1995 [4]. By the end of 2010, this number was up to approximately 390 ppm [5]. To reduce human influence on the global environment, carbon capture and sequestration (CCS) is proposed as a means of collecting CO 2 generated through industrial and consumer processes and sequestering it so as not to release it into the atmosphere, thereby reducing atmospheric concentrations of the gas. Suggested methods of sequestration include direct deep-sea injection [6], soil sequestration through improved land use and management practices [7], and geological carbon sequestration in which captured carbon is injected into underground geological features. This research focuses primarily on development and testing of a leak detection technology for deployment to geological sequestration sites. A diverse technology portfolio will be required to implement safe and efficient sequestration solutions [8]. Included in this portfolio is technology capable of monitoring sequestration site integrity; detecting and signaling leakage, should it occur. Early leak detection is paramount to ensuring on-site safety and to minimize, or at least understand, potentially harmful environmental leak effects.
Reliability analysis of radiation induced fault mitigation strategies in field programmable gate arrays
(Montana State University - Bozeman, College of Engineering, 2014) Hogan, Justin Allan; Chairperson, Graduate Committee: Brock LaMeres
This dissertation presents the results of engineering design and analysis of a radiation tolerant, static random-access-memory-based field programmable gate array reconfigurable computer system for use in space flight applications. A custom satellite platform was designed and developed at Montana State University. This platform facilitates research into radiation tolerant computer architectures that enable the use of commercial off-the-shelf components in harsh radiation environments. The computer architectures are implemented on a Xilinx Virtex-6 field programmable gate array, the configuration of which is controlled by a Xilinx Spartan-6 field programmable gate array. These architectures build upon traditional triple modular redundancy techniques through the addition of spare processing resources. The logic fabric is partitioned into discrete, reconfigurable tiles with three tiles active in triple modular redundancy and remaining tiles maintained as spares. A voter circuit identifies design-level faults triggering rapid switch to a spare tile. Blind or readback scrubbing prevents the accumulation of configuration memory faults. The design and results from a variety of integrated system tests are presented as well as a reliability analysis of the radiation effects mitigation strategy used in the system. The research questions addressed by this dissertation are: 1) Does the inclusion of spare circuitry increase system reliability? 2) How do single-points-of-failure affect system reliability? and 3) Does migrating single-points-of-failure to an older technology node (technology partitioning) offer an improvement in reliability?