The closure of the Manawatu Gorge in August 2011 caused a change in the travel time for patients living in the eastern area of the MidCentral Health District to their main hospital and health services located in Palmerston North. This presented an opportunity to study the effect a change in travel time and spatial access had on a population before and after such an event. This study used a retrospective cohort design, using routinely collected data from general practice, emergency department, hospital admissions and outpatient services. The investigation was completed using novel geospatial information systems methods to produce high fidelity data for analysis with free and open source software by developing and validating two new methods of improving geocoding data quality and a new travel time prediction model. Potential and realised spatial accessibility measures were calculated for 101,456 patients over 3.5 years while the gorge was both open and closed. Catchment sensitivity analysis and two-step floating catchment area using distance decays presented complimentary evidence of accessibility change during the Manawatu Gorge closure. Analysis of utilisation measures in both primary and secondary care were correlated with travel time. Utilisation of general practice services appeared to be negatively impacted by increased travel time when comparing realised accessibility in a control and intervention group during the gorge closure. It appeared as though other factors affected access to health services to a greater degree than an increase of up to fifteen minutes travel time.

Energy poverty – the circumstance of depending on low quality fuels and inefficient end-uses, or conversely, the lack of access to modern energy services – is one of the defining global issues of our time. Access to electricity is essential to eradicating energy poverty and empowering individuals, communities and economies, to reach their potential. Globally, 1.3 billion people, mainly in less developed countries, lack access to electricity. While central grid extension often provides electricity at very low cost, the reliability of the central grid in less developed countries is so low that the priority given by policy makers to central grid extension must be questioned. Rather than maximizing the extent of often unreliable or simply unenergized central grid extensions, we demonstrate the imperative to consider a multi-track approach to electricity access that includes microgrids and high quality solar lighting products. Through case studies and modeling efforts based on extensive empirical data, we provide new insight to this imperative and elucidate the nature of the challenges and solutions for microgrids to eradicate energy poverty.

In this dissertation, analysis and design of the efficient Medium Access Control (MAC) sub-layer schemes are considered for Vehicular Ad hoc Networks (VANE~s). The contributions of this study are three-fold. First, an analytical model based on Markov chain is developed in order to investigate the performance of the MAC sub-layer of the IEEE 802.11p for vehicular communications. The results indicate that single channel MAC sub-layers may not be adequate for the future Intelligent Transportation Systems (ITS). The analytical model is validated with the results from simulation-based analysis. Performance analysis based on simulations is given on MAC metrics such as throughput, access delay, packet delivery. Second, a multi-channel MAC protocol is proposed and comprehensively analyzed in terms of channel utilizing and Quality of service (QoS) differentiation for dense VANETs. It is demonstrated that the proposed scheme, namely Asynchronous Multichannel MAC with Distributed TDMA (AMCMACD), improves the system performance in terms of throughput, packet delivery rate, collision rate on service channels, load balancing, and service differentiation for dense vehicular networks. Third, to cope with the interference from contention with neighbours within two hops in large-scale networks, a Large-scale Asynchronous Multichannel MAC (LS-AMCMAC) is proposed. The proposed scheme outperforms other benchmark multichannel MAC schemes in large-scale networks, in terms of throughput, channel utilization, dissemination of emergency messages, and the collision rates on control and service channels.

No description available.

The relationship between transportation and economic development is well documented. Two requirements indispensable to this relationship are access (ability to reach a place) and connectivity (relationship of the place to others). The interaction of people and markets via transportation infrastructure facilitates trade and increased social interaction; all vital for development. This thesis examines the nature of access and connectivity of the multi-modal transport network (i.e. road, rail, water and air modes) of Northern Manitoba, a study area characterized by many small communities distributed in a vast area, with some having no year-round overland access, forcing them to rely on the seasonally constructed winter road system. Models of the four modal networks (graph theory) are used to analyze the transportation network’s structure, accessibility and connectivity for specific points in time with a view to understand network change. Recommendations are offered that would facilitate the integration of transportation planning.

Every municipality in Manitoba has a distinct and valuable history, but many stories are already lost, and many more are at risk due to poor recordkeeping and archiving. Municipal records document local decisions, actions, finances, the relationship between governments and citizens, and much more. Most of this information is only available in municipal government records; it does not exist anywhere else. Additionally, despite municipal reliance on local records and archives in their day-to-day operations, and as a key source in constructing specific community identities, many municipal government offices have neglected, forgotten, or no longer see the value in maintaining an archive. As a result, municipal governments cannot be held fully accountable for their actions and are unable to abide by the archival requirements of the Municipal Act and the access and privacy provisions outlined in the Freedom of Information and Protection of Privacy Act. They are also thereby failing to take advantage of the archival services offered through the Archives of Manitoba as outlined in the province’s Archives and Recordkeeping Act. This project examines how municipal employees and citizens view recordkeeping, particularly how archival records are considered. In order to learn how municipal officials deal with both their current and archival records a survey was sent to all the municipalities in Manitoba outside of Winnipeg, which was excluded because it had made considerable recent progress by establishing a city archives. Driven by a concern that municipal records outside of Winnipeg are not being adequately managed and archived, this thesis studies the way municipalities are treating both their operational and archival records. These findings are contextualized by looking at municipal archives and archival practices across Canada. Finally, the thesis provides some suggestions for improving recordkeeping practices in Manitoba’s municipalities.

This study is based on ethnographic research that was conducted in the villages of Santa María de Rivas and San Gerardo de Rivas in the coffee farming region of Pérez Zeledón, Costa Rica. While these two villages are in close proximity to each other, the economy of San Gerardo is based more on tourism than the economy of Santa María, although both towns still engage in agricultural activities. Within each village, I conducted 15 preliminary interviews, followed by ten follow-up interviews with the main food preparers of the households. From in depth discussions, I found that food consumption patterns of people in both towns were being affected by seasonal variations in incomes due to the cyclical nature of employment in both tourism and agriculture. A number of households from these villages were experiencing periods of food worries throughout the year that were linked to the seasonality of tourism as well as agriculture, and in particular coffee production. Seasonal availability of particular food items also shaped consumption patterns; however, perceptions of food insecurity in this context appear to be primarily related to problems of access.

The relationship between transportation and economic development is well documented. Two requirements indispensable to this relationship are access (ability to reach a place) and connectivity (relationship of the place to others). The interaction of people and markets via transportation infrastructure facilitates trade and increased social interaction; all vital for development. This thesis examines the nature of access and connectivity of the multi-modal transport network (i.e. road, rail, water and air modes) of Northern Manitoba, a study area characterized by many small communities distributed in a vast area, with some having no year-round overland access, forcing them to rely on the seasonally constructed winter road system. Models of the four modal networks (graph theory) are used to analyze the transportation network’s structure, accessibility and connectivity for specific points in time with a view to understand network change. Recommendations are offered that would facilitate the integration of transportation planning.

Our work addresses a well documented problem: users are frequently unable to articulate a query that clearly and comprehensively expresses their information need. This can be attributed to the information need being too ambiguous and not clearly defined in the user's mind, to a lack of knowledge of the domain of interest on the part of the user, to a lack of understanding of a retrieval system's conceptual model, or to an inability to use a certain query syntax. This thesis proposes a software tool that emulates the human search mediator. It helps a user explore a domain of interest, learn its structure, terminology and key concepts, and clarify and refine an information need. It can also help a user generate high-quality queries for searching the World Wide Web or other such large and heterogeneous document collections. Our work was inspired by library studies which have highlighted the role of the librarian in helping the user explore her information need, define the problem to be solved, articulate a formulation of the information need and adapt it for the retrieval system at hand in order to get information. Our approach, mediated access through a clustered collection, is based on an information access environment in which the user can explore a relatively small, well structured, pre-clustered document collection covering a particular subject domain, in order to understand the concepts encompassed and to clarify and refine her information need. At the same time, the user can ostensively indicate clusters and documents of interest so that the system builds a model of the user's topic of interest. Based on this model, the system assists and guides the user's exploration, or generates `mediated queries' that can be used to search other collections. We present the design and evaluation of WebCluster, a system that reifies the concept of mediated retrieval. Additionally, a variety of mediation experiments are presented,which provide guidelines as to which mediation strategies are more appropriate for different types of tasks. A set of experiments is presented that evaluate document clustering's capacity to group together topical documents and support mediation. In this context we propose and experimentally test a new formulation for the cluster hypothesis. We also look at the ability of language models to convey content, to represent topics and to highlight specific concepts in a given context. They are also successfully applied to generate flexible, task-dependent cluster representatives for supporting exploration through browsing and respectively searching. Our experimental results show that mediation has potential to significantly improve user queries and consequently the retrieval effectiveness.

No description available.