published_or_final_version / Urban Planning / Master / Master of Science in Urban Planning

This dissertation presents a sampling-based method that can be used for uncertainty quantification and deterministic or probabilistic optimization. The objective is to simultaneously address several difficulties faced by classical techniques based on response values and their gradients. In particular, this research addresses issues with discontinuous and binary (pass or fail) responses, and multiple failure modes. All methods in this research are developed with the aim of addressing problems that have limited data due to high cost of computation or experiment, e.g. vehicle crashworthiness, fluid-structure interaction etc.The core idea of this research is to construct an explicit boundary separating allowable and unallowable behaviors, based on classification information of responses instead of their actual values. As a result, the proposed method is naturally suited to handle discontinuities and binary states. A machine learning technique referred to as support vector machines (SVMs) is used to construct the explicit boundaries. SVM boundaries can be highly nonlinear, which allows one to use a single SVM for representing multiple failure modes.One of the major concerns in the design and uncertainty quantification communities is to reduce computational costs. To address this issue, several adaptive sampling methods have been developed as part of this dissertation. Specific sampling methods have been developed for reliability assessment, deterministic optimization, and reliability-based design optimization. Adaptive sampling allows the construction of accurate SVMs with limited samples. However, like any approximation method, construction of SVM is subject to errors. A new method to quantify the prediction error of SVMs, based on probabilistic support vector machines (PSVMs) is also developed. It is used to provide a relatively conservative probability of failure to mitigate some of the adverse effects of an inaccurate SVM. In the context of reliability assessment, the proposed method is presented for uncertainties represented by random variables as well as spatially varying random fields.In order to validate the developed methods, analytical problems with known solutions are used. In addition, the approach is applied to some application problems, such as structural impact and tolerance optimization, to demonstrate its strengths in the context of discontinuous responses and multiple failure modes.

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Sabang used to be a small, marginalized Philippine fishing village that in the span of three decades became a well-known international sex tourism site. This thesis deals with the implications of tourism (including sex tourism) and how it has become embedded in the daily life in today’s Sabang. The thesis highlights the local populations’ diverse reactions to the various changes associated with tourism growth, in particular how various symbolic, moral, and spatial boundaries are constructed and maintained. The ethnographic material examined in this thesis builds on several periods of fieldwork, in total 18 months, that were carried out between 2003 and 2015. Analytical tools found in tourism anthropology and in particular the branch of postcolonial tourism studies has guided the discussion and analysis of the socio-cultural effects of becoming a tourism town. This thesis argues that complex networks of boundaries are significant in maintaining a sense of order and social cohesion in times of change. Notions of cultural differences are expressed through the narratives and behaviors of the various inhabitants, and contribute to the maintaining of boundaries within and between groups. From the beginning of tourism growth commercial sex has been central and has become a significant factor in the tourism economy. While residents acknowledge their dependency on the go-go bars, the business of the night is framed so as not to defeat the inhabitants’ struggles to maintain local community’s sense of morality, or at least to set up boundaries between the outsiders’ immorality and insiders’ morality. Tourism has also offered opportunities to challenge conventional social hierarchies and local seats of power, and there are also recurrent discussions about who has the right to control resources and who can claim entitlement to a place now shared by people from all over the world.

The behaviour of colloidal particles in two-dimensional (2D) systems is addressed in real space and time using magnetic fields, optical tweezers and optical video microscopy. First, the fluctuations of a grain boundary in a 2D colloidal crystal are analysed. A real space analogue of the capillary fluctuation method is derived and successfully employed to extract the key parameters that characterise the grain boundary. Good agreement is also found with a fluctuation-dissipation based method recently suggested in simulation. Following on from analysis of the interface fluctuations, the properties of the individual grain boundary particles are analysed to investigate the long standing hypothesis that suggests that grain boundary particle dynamics are similar to those in supercooled liquids. The grain boundary particle dynamics display cage breaking at long times, highly heterogeneous particle dynamics and the formation of cooperatively moving regions along the interface, all typical behaviour of a supercooled liquid. Next, the frustration induced by confining colloidal particles inside a pentagonal environment is investigated. The state of the system is adjusted via two separate control parameters: the inter-particle interaction potential and the number density. A gradual crystalline to confined liquid-like transition is observed as the repulsive inter-particle interaction potential is decreased. In contrast, re-entrant orientational ordering and dynamical effects result as the number density of the confined colloidal particles is increased. Finally, the dynamics of colloidal particles distributed amongst a random array of fixed obstacle particles is probed as a function of both the mobile particle and fixed obstacle particle number densities. Increasing the mobile and the obstacle particle number density drives the system towards a glass transition. The dynamics of the free particles are shown to behave in a similar way to the normal glass transition at low obstacle density and more analogous to a localisation glass transition at high obstacle density.

"The purpose of this study was to show the position of Texas in the relations between the United States and Mexico from 1876 to 1910. With this thought in mind, the general problem has been to link the two countries through Texas. The Texas border relations between the United States and Mexico during this period were interesting because they showed the continued success of the efforts of the past years in building up better principles of settlement. " --leaf 129

Master of Science / Family Studies and Human Services / Joyce Baptist / The present study examined whether married individuals hold boundaries for online social networking and the relationship between these boundaries and relational trust and satisfaction. Participants included 205 married individuals who had been married for an average of 27 years. Five specific boundaries were identified and tested using group comparison (by sex) structural equation modeling. Confirmatory factor analysis revealed two latent constructs for internet boundaries: Openness (3 items: Know Friends, Share Passwords and Account Access) and Fidelity (2 items: No Flirting and No Former Partners). Findings suggest that couples in long-term committed relationships have boundaries or rules for social networking. Furthermore, trusting one’s partner, but not relationship satisfaction, contributes to behaviors that reflect sharing online social networking information, and curb online flirting and relationships with former romantic partners. Trust was more strongly associated with men’s than women’s motivation to avoid flirtatious online interaction and communicating with former romantic partners online. These findings that indicate that the use of internet boundaries is highly related to marital trust support the development theory of trust.

Doctor of Philosophy / Department of Family Studies and Human Services / Joyce Baptist / Very little research has been conducted to understand how the technology revolution has changed and impacted couple relationships. The proposed study examined the impact of technology on couples in committed relationships through the lens of the couple and technology framework. Specifically, this study used data from 2,826 European couples to examine associations between online boundary crossing, online intrusion, relationship satisfaction, and partner responsiveness. The results suggest that when participants’ reported that their partner checked up on their online activities more frequently that this was linked with lower scores on relationship satisfaction and partner responsiveness. Also, decreased scores for relationship satisfaction and partner responsiveness were associated with increased acceptance for their partner using the Internet to talk with someone attractive about everyday life or pop culture, personal information, and relationship troubles or concerns. Lastly, the results suggest that men, but not women, who reported greater acceptability for online boundary crossing were more likely to have partners who reported lower relationship satisfaction in their relationships. Implications for clinicians, relationship educators, and researchers are discussed.