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We study the depth of decision trees for diagnosis of constant faults in read-once contact networks over finite bases. This includes diagnosis of 0-1 faults, 0 faults and 1 faults. For any finite basis, we prove a linear upper bound on the minimum depth of decision tree for diagnosis of constant faults depending on the number of edges in a contact network over that basis. Also, we obtain asymptotic bounds on the depth of decision trees for diagnosis of each type of constant faults depending on the number of edges in contact networks in the worst case per basis. We study the set of indecomposable contact networks with up to 10 edges and obtain sharp coefficients for the linear upper bound for diagnosis of constant faults in contact networks over bases of these indecomposable contact networks. We use a set of algorithms, including one that we create, to obtain the sharp coefficients.

Epidemic models help researchers understand and predict the nature of a potential epidemic. This study analyzes and improves network evolution technology that evolves contact networks so that simulated epidemics on the network mimic a specified epidemic pattern. The evolutionary algorithm incorporates the novel recentering-restarting algorithm, which is adopted into the optimizer to allow for efficient search of the space of networks. It also implements the toggle-delete representation which allows for broader search of solution space. Then, a diffusion character based method is used for analyzing the contact networks. A comparison of simulated epidemics that result from changing patient zero for a single contact network is performed. It is found that the location of patient zero is important for the behaviour of an epidemic. The social fabric representation is invented and then tested for parameter choices. The response to vaccination strategies (including ring vaccination) is then tested by incorporating them into the epidemic simulations. / Ontario Graduate Scholarship (OGS), Natural Sciences and Engineering Research Council of Canada (NSERC)

El presente trabajo de investigación tiene como objetivo principal analizar de qué manera la participación en Ferias Comerciales como mecanismo de promoción y desarrollo contribuye a las empresas exportadoras de mandarinas entre los años 2017-2020. Por un lado, el análisis se realiza considerando tres etapas de participación en las ferias comerciales (i) Preparación para la participación en la feria, (ii) Performance durante la participación en la feria y (iii) Post participación en la feria, siendo este un enfoque diferente a lo ya estudiado. Por otro lado, se busca encontrar en forma práctica, la relevancia de cada etapa en cuanto a la promoción a través de ferias del producto Superfoods mandarina. Para ello, se aplicó una investigación cualitativa con un diseño de teoría fundamentada. Para la recopilación de la información del estudio, fue necesario realizar entrevistas a profundidad a 12 expertos de entidades involucradas al problema de investigación como PROMPERÚ, ADEX, AGAP, PROCITRUS, consultores externos y empresas exportadoras de mandarina. De acuerdo con los datos obtenidos, estos fueron analizados y procesados mediante el programa Atlas Ti. Con relación a los resultados, se pudo llegar a la conclusión que la participación en Ferias Comerciales como mecanismo de promoción y desarrollo si influye de manera positiva a las empresas exportadoras de mandarinas entre los años 2017-2020. / The main objective of this research work is to analyze how participation in Trade Fairs as a promotion and development mechanism contributes to mandarin exporting companies between the years 2017-2020. On the one hand, the analysis is carried out considering three stages of participation in trade fairs (i) Preparation for participation in the fair, (ii) Performance during participation in the fair and (iii) Post participation in the fair, this being a different approach to what you already studied. On the other hand, it seeks to find, in a practical way, the relevance of each stage in terms of the promotion through fairs of the SuperFoods mandarin product. For this, qualitative research was applied with a fundamental theory design. To collect the information for the study, it was necessary to conduct in-depth interviews with 12 experts from entities involved in the research problem such as PROMPERÚ, ADEX, AGAP, PROCITRUS, external consultants and mandarin exporting companies. According to the data obtained, these were analyzed and processed using the Atlas Ti program. In relation to the results obtained, it was possible to conclude that participation in Trade Fairs as a promotion and development mechanism does positively influence mandarin exporting companies between the years 2017-2020. / Tesis