Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 112 for “"Engineered systems"”.
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A General Theory of Emergence in Engineered Systems
<p>Engineered systems are designed to satisfy specific needs and produce explainable/predictable results. But despite this intent, engineered systems don’t always do what they are designed to do once they are implemented. Some engineered systems produce properties and behaviors that are not clearly …
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Design of Joint Verification-Correction Strategies for Engineered Systems
… is a critical process in the development of engineered systems. Engineers gain confidence in the correct functionality of the system by executing system verification. Traditionally, system verification is implemented by conducting a verification strategy (VS) consisting of verification …
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Geochemcial Controls on Arsenic and Phosphorus in Natural and Engineered Systems
This thesis elucidates fundamental reactions that can control concentrations of arsenic and phosphate in water sources. High levels of arsenic or phosphorus have significant implications for the environment-- arsenic is extremely toxic to humans while phosphorus can cause eutrophication. Initial …
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A SYSTEMS RELIABILITY APPROACH TO MODELING OPERATIONAL RISKS IN COMPLEX ENGINEERED SYSTEMS
… the cause of many serious accidents in hydrosystems engineering has shifted from natural causes to human and technology related causes as these systems get more complex. While natural disasters still account for a significant amount of human and material losses, man-made disasters are …
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Cell-based sensors for quantifying cell health and disease progression in engineered systems
… to design 'cell-friendly' methodologies. We engineered cell-based sensors that emit stress-regulated fluorescence, and applied them to characterize how distinct microenvironments regulate cell health. Here, we describe two endeavors that highlight the utility of this approach. We first …
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Fault detection in multivariate processes : handling autocorrelation, contamination, and small sample sizes in engineered systems.
Multivariate statistical process monitoring is commonly used to detect faults, or unexpected deviations from normal operating behavior, in complex processes. Faults are typically identified by comparing process behavior in real-time to previously observed in-control process behavior. Many existing …
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The Evolutionary Design Model (EDM) for the design of complex engineered systems : Masdar City as a case study
… (EDM) that would enhance the design of complex systems through an efficient process. The framework proposed is generic and suggests a group of systematic methodologies that eventually lead to a fully realized and integrated design model. Within this model, complexities of the design are handled …
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Aqueous Silica in the Environment: Effects on Iron Hydroxide Surface Chemistry and Implications for Natural and Engineered Systems
… to play an important role in environmental systems. Experiments were conducted to investigate the fundamentals of silica sorption onto pre-formed ferric hydroxide at pH 5.0-9.5 and silica concentrations of 0-200 mg/L as SiO₂. Over the entire pH range studied, sorption densities exceeding …
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Engineered 3D microenvironments to understand and direct liver progenitor and cancer cell fate
… to changes in cell function and fate, the use of engineered systems allows for deconstruction of the various cues to understand the roles that they play in cell behavior and to understand how these cues can be used to modulate cell fate. Often these systems take the form of in vitro 2D monolayer …
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Integration of Hidden Markov Modelling and Bayesian Networks for fault analysis of complex systems. Development of a hybrid diagnostics methodology based on the integration of hidden Markov modelling and Bayesian networks for fault detection, prediction and isolation of complex automotive systems
The complexity of engineered systems has increased remarkably to meet customer needs. In the continuously growing global market, it is essential for engineered systems to keep their productivities which can be achieved by higher reliability and availability. Integrated health management based on …
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Integration of Hidden Markov Modelling and Bayesian Networks for fault analysis of complex systems. Development of a hybrid diagnostics methodology based on the integration of hidden Markov modelling and Bayesian networks for fault detection, prediction and isolation of complex automotive systems
The complexity of engineered systems has increased remarkably to meet customer needs. In the continuously growing global market, it is essential for engineered systems to keep their productivities which can be achieved by higher reliability and availability. Integrated health management based on …
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A Systems-Theoretic Approach to Organizational Design and Analysis
… common purpose. Organizations are purely social systems in that their elements are not technical or engineered. Systems Theory provides a lens through which these types of social systems can be studied. Just like in engineered systems, an organization's emergent behavior is determined by its …
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A Phenomenographic Study of How Aerospace Engineers Experience Uncertainty When Making Design Decisions
… uncertainty as they design large scale complex engineered systems. The results of this study are valuable for understanding learning trajectories of engineers beyond their academic experiences and for linking the professional and technical skills in industry to the undergraduate engineering …
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Nonreciprocal phenomena in superconductivity
… unusual phenomena that arise in low-dimensional systems in the presence of a magnetic field. The first example that we discuss is nonreciprocal superconductivity, which occurs upon simultaneous breaking of inversion and time-reversal symmetries. Nonreciprocal superconductors describe certain …
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A Game Theoretic Framework to Secure Cyber Physical Systems (CPS) against Cyber Attacks
Cyber-Physical Systems (CPS) is a term describing a broad range of complex, multi-disciplinary, physically-aware next generation engineered systems that integrate embedded computing technologies (cyber part) into the physical world. CPS are engineered systems that are built from, and depend upon, …
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The tolerance of a Rhodococcus drinking water isolate and Zoogloea ramigera to silver nanoparticles in biofilm and planktonic cultures
… negatively affect microorganisms in natural and engineered systems. The effects of Ag NPs on microorganisms have primarily been studied in planktonic or free-swimming cultures, but little work has been done to look at biofilm susceptibility to Ag NPs. This thesis describes bacterial tolerance, or …
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Structural complexity and its implications for design of cyber-physical systems
… modern era software-enabled, electro-mechanical systems are becoming more complex as we demand more performance and better lifecycle properties (e.g. robustness) from them. As a consequence system development projects are becoming increasingly challenging and are falling behind in terms of …
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