As digital communication of television content becomes more pervasive, and as networks supporting such communication become increasingly diverse, the long-standing problem of assessing video quality by objective measurements becomes particularly important. Content owners as well as content distributors stand to benefit from rapid objective measurements that correlate well with subjective assessments, and further, do not depend on the availability of the original reference video. This thesis investigates different techniques of subjective and objective video evaluation. Our research recommends a functional quality metric called Mean Time Between Failures (MTBF) where failure refers to video artifacts deemed to be perceptually noticeable, and investigates objective measurements that correlate well with subjective evaluations of MTBF. Work has been done for determining the usefulness of some existing objective metric by noting their correlation with MTBF. The research also includes experimentation with network-induced artifacts, and a study on statistical methods for correlating candidate objective measurements with the subjective metric. The statistical significance and spread properties for the correlations are studied, and a comparison of subjective MTBF with the existing subjective measure of MOS is performed. These results suggest that MTBF has a direct and predictable relationship with MOS, and that they have similar variations across different viewers. The research is particularly concerned with the development of new no-reference objective metrics that are easy to compute in real time, as well as correlate better than current metrics with the intuitively appealing MTBF measure. The approach to obtaining greater subjective relevance has included the study of better spatial-temporal models for noise-masking and test data pooling in video perception. A new objective metric, 'Automatic Video Quality' metric (AVQ) is described and shown to be implemented in real time with a high degree of correlation with actual subjective scores, with the correlation values approaching the correlations of metrics that use full or partial reference. This is metric does not need any reference to the original video, and when used to display MPEG2 streams, calculates and indicates the video quality in terms of MTBF. Certain diagnostics like the amount of compression and network artifacts are also shown.

Abstract - Through our work we validated the symmetry and leniency heuristics used to evaluate content which has been procedurally generated in a mixed-initiative tool called the Evolutionary Dungeon Designer (EDD). This was done by analyzing and comparing how said heuristics differs from what a human player perceives the metrics to be. A user study was performed for which we developed a game for human testers to try and experience different dungeons, in order to collect the data needed for making the necessary comparisons. We propose potential improvements to the metrics that are intended to represent difficulty and aesthetics used in EDD so that they could better match their intended goals. In general, the testers found the maps to be close to the expected difficulty but there was a big discrepancy in the symmetry metric and how aesthetic they found the maps. We further discuss how the research performed by us could be expanded upon for the purpose of making further improvements to automatic evaluation heuristics, by either making similar research on games of different genres or on games with different game mechanics.

The field of software engineering embraces measurement, analysis and modeling of software. Software metrics are often based on counting, whereas this thesis adopts information theory. The goal of this research is to show that information theory-based metrics proposed by Allen can be useful for software development projects compared to counting-based metrics. Briand, et.al. have defined five families of measures based on counting the elements of a graph. This research considers a hypergraph system. Parallel Mathematical Library Project (PMLP) was used as the case study. Abstract semantic graphs were generated for the C++ source files of PMLP in the form of nodes * hyperedges tables, which are measured for counting and information theory-based measures. Analysis showed that information theory-based metrics provide fine-grained distinctions among the modules, compared to the counting-based metrics. The case study measurements conformed to the properties proposed by Briand et.al. as well.

No description available.

This study investigates the Web presence and Web Impact Factor (WIF) for country code top-level domains (ccTLDs) of Middle-Eastern countries, and sub-level domains (SLDs) related to education and academic institutions in these countries. Counts of links to the web sites of Middle-Eastern countries were calculated from the output of Yahoo search engine. In this study, we compute the WIF at two levels: top-level domains, and sub-level domains. The results show that the Middle-Eastern countries, apart from Turkey, Israel and Iran, have a low web presence. On the other hand, their web sites have a low inlink WIF. Specific features of sites may affect a countryâ s Web Impact Factor. For linguistic reasons, Middle-Eastern web sites (Persian, Kurdish, Turkish, Arabic, and Hebrew languages) may not receive and attract the attention that they deserve from the World Wide Web community.

No description available.

This project was created in response to the need for research into web links: including web link mining, and the creation of link metrics. It is aimed at providing the raw data and software for researchers to analyse link structures without having to rely upon commercial search engines, and without having to run their own web crawler. This site will contain all of the following. *Complete databases of link structures of collections of academic web sites. *Files of summary statistics about the link databases. *Software tools for researchers to extract the information that they are particularly interested in. *Descriptions of the methodologies used to crawl the web so that the information provided can be critically evaluated. *Files of information used in the web crawling process.

It is well documented that the health behaviours and health status of Canadian youth are of increasing concern. This includes their inactive and sedentary lifestyle, less than recommended daily consumption of fruits and vegetables, and excessive intake of sugar sweetened beverages thought to contribute to the early development of metabolic syndrome, some cancers and certainly obesity. Strategies for reversing the declining health of Canadian youth have captured the interest of health promotion researchers. Health education in the school system has been identified as a potential vehicle of change since it is considered to be one of the last wide-scale and cost-free opportunities to motivate and educate students to be healthy and active. However, an increasing amount of research is suggesting that traditional curricula may be failing to adequately convey health information in high school youth. As a result of increasing technological literacy and exposure, a growing field of evidence suggests youth now prefer delivery of health information from electronic sources instead of traditional mediums. The majority of studies observing online health interventions show positive results, but research involving youth, and conducted in real world settings, is still in its infancy. Therefore, the purpose of this study was to examine the utility of an online intervention tool as part of a health education curriculum, to motivate and support grade 10 students to make healthy decisions related to physical activity, screen time, fruit and vegetable consumption and intake of sugar sweetened beverages. Research questions included: (1) How do students use the online tool to support their health behaviour changes? (2) What were students’ experiences using the HPSS online tool? Are they satisfied with its function, features, look and content? (3) Was there any relationship between use of the online tool and students’ behaviour change? Students in Planning 10 and PE 10 courses (N = 44) in two high schools participated in the year-long study. Pre and post intervention data collection procedures included self-report survey of health behaviours, and anthropometric measures (BMI and waist and hip measures) to more objectively capture changes in health outcomes. Focus groups were conducted with students (n = 10) and teachers (n = 6) to gather their feedback about the website and its contribution within the curriculum. Finally, web metrics captured students’ use of and exposure to the online tool over the course of the intervention. Despite evidence in the literature that youth strongly engage with electronic mediums, students’ use of the website in this study was infrequent and disappointing: 52% of students did not login once, and the remainder visited the site fleetingly. No significant relationships between students’ web use and behaviour change were found. Qualitative data revealed that students’ appreciated the interactive and reminder functions of the website, but teachers struggled to define its role within the curriculum as a pedagogical tool, so it failed to attract students’ time and attention. The study contributes to the literature through its investigation of an online health education tool, contextualized in the real life setting of the school classroom. / Graduate

<p>Software complexity metries have long been used in the procedural programming paradigm. Existing OOP metrics do not address how a class's relation to other classes in the inheritance hierarchy affect it's maintenance needs. This research proposes a new OOP metric, Hierarchy Corrected Metric (HCM) that does address a class's relation to others in the hierarchy. HCM uses the values of the standard OOP metrics for each class plus knowledge of the class inheritance hierarchy to anive at a revised complexity measurement for each class. That measurement reflects not only internal complexity for the class but also the influence of other classes in the hierarchy to the complexity of the class. Using data from a commercial system HCM was shown to correlate with maintenance better than existing OOP metrics.</p> / Master of Science

Tropical cyclone (TC) size is integral in determining the spatial extent of TC impacts and is influenced by environmental wind shear and the overall moisture environment. Since initial TC size is related to future TC size, research focused on understanding the influences of TC size away from land can lead to a more complete understanding of the extent of coastal impacts associated with landfalling TCs. This study considers TCs located in an area of low to moderate wind shear located at least 100 km from major land masses. An empirical orthogonal function (EOF) analysis is used to distinguish different environments based on the large-scale spatial pattern of total column water vapor (TCWV) surrounding the TC. Using these EOF patterns, four separate categories (groups) are created. Principal component (PC) scores indicate the time steps most contributing to the EOF pattern for each group and ultimately determine the time steps included in each group. TC sizes among the groups are compared using size metrics based on the wind field and shape metrics based on the precipitation field. These metrics are considered at the central timestep identified in the EOF analysis as well as a 48-hour window centered on the central timestep. There are no significant differences in the wind field size, but TCs with moisture to the southeast are the largest in terms of overall precipitation area. This suggests that moisture affects the size of the precipitation field but not the wind field. However, more research is needed to confirm this relationship. Storms with moisture to the southeast are also more intense and younger than TCs in other groups and show signs of inner core organization and subsequent intensification while TCs in the other groups do not. TCs in an extremely dry environment or with dry air to the southeast of the TC center are generally smaller, less closed, less solid, and older than TCs with moisture to the southeast and TCs with dry air to the northwest of the TC center. An additional analysis comparing the same size and shape metrics between TCs experiencing easterly and westerly shear is also completed. The wind shear results suggest that, while easterly shear is more commonly associated with younger and intensifying TCs regardless of moisture group, an environment with westerly shear is more favorable for intensification of TCs with moisture to the southeast due to the alignment of moisture and upward motion. Future work will investigate the physical processes contributing to these precipitation shape and size differences between groups and wind shear directions. / Master of Science / The size of tropical cyclones (TCs) is heavily influenced by moisture and wind shear. Wind shear is defined as the changing of wind direction with vertical height in the atmosphere. Research focused on investigating how moisture and wind patterns affect the size and structure of TCs can lead to a better understanding of the physical extent of impacts associated with landfalling TCs and advise more effective emergency preparedness plans. This research considers TC time steps located over the ocean and in a calm wind environment. From here, time steps are divided into four groups representing common moisture patterns in the Atlantic basin. TC size is evaluated using size and shape metrics designed to capture the spatial extent and layout of wind and rain associated with the storm. This research also compares the evolution of these size and shape metrics to better understand how the environment around the TC changes over time. Results show that the extent of wind associated with the storm is similar across all groups but TCs with moisture to the southeast are the largest in terms of overall rain area. This suggests that moisture affects the extent of precipitation but not the extent of wind or that wind data are inaccurate. Additionally, TCs with moisture to the southeast are younger and stronger than storms in the other groups. TCs in extremely dry environments and TCs with dry air to the southeast are generally smaller, weaker, and older than TCs in the other groups. In looking at the evolution of these size and shape metrics, TCs with moisture to the southeast group become stronger with time while TCs in the other groups do not. An additional analysis comparing TCs experiencing different wind patterns is completed. Results of this show that, while easterly wind shear, characterized by surface winds out of the west and upper level winds out of the east, is more commonly associated with strengthening TCs when moisture is not considered, TCs with moisture to the southeast in an environment with westerly wind shear are more likely to strengthen over time due to the alignment of moisture with favorable environmental conditions within the storm by the overall wind pattern. Westerly shear is characterized by winds at the surface out of the east and upper level winds out of the west. Future work should focus on the environmental processes contributing to the size and shape differences observed between moisture groups and wind patterns.