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The emergence of social media has impacted the way people think, communicate, behave, learn, and conduct research. In recent years, a large number of studies have analyzed and modeled this social phenomena. Driven by commercial and social interests, social media has become an attractive subject for researchers. Accordingly, new models, algorithms, and applications to address specific domains and solve distinct problems have erupted. In this thesis, we propose a novel network model and a path mining algorithm called HashnetMiner to discover implicit knowledge that is not easily exposed using other network models. Our experiments using HashnetMiner have demonstrated anecdotal evidence of drug-drug interactions when applied to a drug reaction context. The proposed research comprises three parts built upon the common theme of utilizing hashtags in tweets. 1 Digital Recruitment on Twitter. We build an expert system shell for two different studies: (1) a nicotine patch study where the system reads streams of tweets in real time and decides whether to recruit the senders to participate in the study, and (2) an environmental health study where the system identifies individuals who can participate in a survey using Twitter. 2 Does Social Media Big Data Make the World Smaller? This work provides an exploratory analysis of large-scale keyword-hashtag networks (K-H) generated from Twitter. We use two different measures, (1) the number of vertices that connect any two keywords, and (2) the eccentricity of keyword vertices, a well-known centrality and shortest path measure. Our analysis shows that K-H networks conform to the phenomenon of the shrinking world and expose hidden paths among concepts. 3 We pose the following biomedical web science question: Can patterns identified in Twitter hashtags provide clinicians with a powerful tool to extrapolate a new medical therapies and/or drugs? We present a systematic network mining method HashnetMiner, that operates on networks of medical concepts and hashtags. To the best of our knowledge, this is the first effort to present Biomedical Web Science models and algorithms that address such a question by means of data mining and knowledge discovery using hashtag-based networks.

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal.

La majorité des adolescents québécois auront consommé une substance psychoactive avant la fin de leurs études secondaires. Parmi les facteurs ayant une influence sur cette consommation, on retrouve les normes sociales, dont les normes descriptives. Ce mémoire vise à évaluer l’impact des normes descriptives du milieu scolaire sur les comportements d’usage de cannabis chez les adolescents québécois, ainsi que sur les méfaits attribués à cette consommation. Cette étude examine les liens entre l’écart de perception de prévalence de consommation de cannabis au sein d’une école et la consommation ainsi que les conséquences attribuées à cet usage par les élèves. De plus, elle examine le rôle modérateur des écarts de perception de la prévalence de consommation sur la progression de la consommation, ainsi que sur le lien entre la consommation de cannabis en secondaire 4 et des conséquences attribuées à cette consommation un an plus tard. Provenant de la Stratégie d’Intervention Agir Autrement, l’échantillon de cette étude est constitué de 1601 élèves suivis de secondaire 2 à secondaire 5. Des analyses de régression logistique multinomiale ont été conduites et ont montré que plus les élèves surestiment la prévalence de consommation de cannabis au sein de leur école, plus ils ont de chance de consommer du cannabis et d’attribuer des conséquences négatives à leur consommation un an plus tard. Les résultats ont également montré un effet modérateur positif de l’écart de perception de la prévalence sur la progression de la consommation de cannabis de secondaire 4 à 5, spécifiquement chez les élèves ayant une faible consommation en secondaire 4. Finalement, les résultats ont montré un deuxième effet modérateur de l’écart de perception de prévalence, celui-ci sur le lien entre la consommation de cannabis en secondaire 4 et l’attribution de conséquences négatives à cette consommation un an plus tard. Précisément, les élèves ayant une faible consommation et qui surestiment la prévalence de consommation de cannabis au sein de leur école auront plus de chance d’attribuer plusieurs méfaits à leur consommation en secondaire 5 que d’en attribuer aucun. Par contre, les élèves ayant une consommation de cannabis élevée en secondaire 4 ne rapportent pas plus ni moins de conséquences selon leur estimation de prévalence. Les implications de ces résultats sont discutées. / Substance use in adolescence is a relatively common behavior. By the end of high school, a majority of Quebec teenagers will have experimented with psychoactive drugs or alcohol. Among the multiple factors influencing substance use are the social norms, namely the descriptive norms. This study evaluates the impact of the misperception of descriptive norms within the school context on marijuana use and its related consequences. Specifically, this study examines the relationship between the misperception of prevalence of cannabis use within a high school and the actual use of marijuana and its attributed related consequences. It also examines the moderating role of misperception of cannabis use prevalence on the progression of marijuana usage, and on the relationship between cannabis use in 10th grade and its attributed consequences a year later. Using data from the New Approaches, New Solutions intervention strategy, 1601 high school students were followed from grade 8 through grade 11. Multinomial logistic regression analyses were conducted and have indicated that the more the students overestimate the prevalence of cannabis use, the more chances they have to use marijuana themselves and attribute negative consequences to their cannabis use a year later. Results have also shown a moderating effect of the misperception of prevalence of cannabis use on the progression of marijuana use from grade 10 to 11, particularly with the students using marijuana occasionally in grade 10. Results also indicate a moderating effect of the misperception of prevalence of school wide cannabis use on the relationship between marijuana use in grade 10 and attributed consequences a year later. Specifically, students using marijuana occasionally and who overestimate the prevalence of cannabis use by their school peers will have more chances of attributing more than three consequences to their drug use in grade 11 than to attribute no harm to it whereas students who use marijuana frequently in grade 10 do not attribute consequences in accordance with their estimation of the prevalence of cannabis use by their school peers. Clinical implications of these findings are discussed.

Este estudo trouxe o debate sobre a Política de Combate às Drogas no Brasil sob o enfoque metodológico da Criminologia Crítica, utilizando autores de referência como Alessandro Baratta e Salo de Carvalho. A crítica vai ao sentido de questionar o proibicionismo, perspectiva que embasa as políticas de combate às drogas no mundo, com grande influência no Brasil. Do ponto de vista histórico é evidente que o proibicionismo não tem evitado o consumo das drogas, muito menos tem contribuído para minimizar os efeitos deletérios sobre a questão social que o tráfico ocasiona, arrebanhando em suas práticas ilícitas uma série de crimes que afetam toda a sociedade, particularmente, nas franjas mais pauperizadas da classe trabalhadora. Nessa perspectiva, a atual Política de Combate às Drogas, por não diferenciar o traficante do usuário apenas contribui para o superencarceramento de jovens das camadas populares. No Brasil o fenômeno do superencarceramento fere os Direitos Humanos. A descriminalização da maconha, nesse sentido, poderá ter forte impacto para evitar a prisão cautelar de jovens usuários ou que portem pequena quantidade da droga. Enquanto a descriminalização não ocorre, mediante amplo debate social, o Estado pode atuar frente à problemática, adotando procedimentos que auxiliam nas decisões judiciais, como a Justiça Restaurativa, a Justiça Terapêutica e a Audiência de Custódia, que se constituem alternativas à prisão cautelar. Por fim, o presente estudo procura trazer algumas reflexões teóricas sobre a política de redução de danos que é uma tendência mundial, adotada por países que aderiram à descriminalização das drogas. / This text brings in the discussion about the drug dealing combat policy in Brazil, under the emphasis of Criticism Criminology. The work is based on authors like Alessandro Baratta and Salo de Carvalho. The argumentation goes on questioning prohibitionism, witch is the bases of the combat policies over the entire world, including Brazil. Under a historical point of view, it´s obvious that prohibiotionism hasn´t been effective in avoiding drug consumption growth, let alone minimizing the deleterious effects over the social issue generated by the drug market, involving in itself a great amount of crimes that affect all the society, in special, the working masses with low incomes.Under this radar, the current combat policy, while not sorting out drug dealers from consumers, contributes itself for the prision population growth. In Brazil particularly, this phenom hurts Human Rights. The Marijuana regulamentation, in this direction, might be a strong factor to avoid the arrest of young users caught with a small amount of the drug. While the decriminalization is still on debate, the government can face the problem with paleactive procedures that would help justice, like Restaurative Justice, Therapeutic Justice and the Custody Audience, for instance. All of them alternatives for the arrest. Lastly, this study brings some theorical insights over the Damage Reduction Policy, a global tendency adopted by many countries that has joined the idea of drug discriminalization.

Notre objectif principal dans ce travail consiste à analyser les facteurs associés à la consommation problématique d’alcool, de tabac ou de cannabis, et aux rôles respectifs des lois et de la communication intrafamiliale des dangers liés à leur usage. Globalement, la norme et le contrôle parental jouent un rôle déterminant dans l’usage de ces trois substances par les 15-25 ans et sont souvent associés à l’intention de rester non-consommateur de tabac, de retarder l’initiation du cannabis et aux intentions de diminuer le nombre de verres bu au cours d’une même soirée ainsi que les alcoolisations ponctuelles importantes (API) fréquentes chez les plus jeunes (15-17 ans). En outre, nos résultats montrent que le sujet relatif aux dangers des drogues comme le cannabis est bien discuté dans les familles mais pas de façon récurrente et que cette discussion est fortement liée au genre. Nos analyses suggèrent la nécessité de lutter contre le tabagisme quotidien des 15-17 ans car toutes les actions prises permettront in fine de lutter contre l’initiation précoce du cannabis. Concernant les non-consommateurs comme les consommateurs de cannabis et d’alcool (API), les efforts de prévention à l’expérimentation et, à la diminution ou à l’arrêt de l’usage devraient être axés prioritairement sur l’amélioration des compétences parentales et sur la résistance à la pression des pairs. / Our main goal in this work is to analyze the factors linked with the controversial consumption of alcohol, tobacco or marijuana and to analyze the role of laws and of the inner family communication about the risk of their use.Norms and parental control have generally a determining role in the use of those three illegal substances in the 15-25 years group. They are usually linked to the idea of remaining clean, I.E, not consuming tobacco and delaying the first contact with marijuana. And to the intention of decreasing the number of glasses during a party as well as the frequent consumption of alcohol which is quite common among the youngers (15-17 years old). Beside this idea, our research shows that topics dealing with alcohol, drugs and tobacco are discussed within the family circle, but are not a repetitive phenomenon. That type of discussion has to do with gender. Our analyses suggest the idea of fighting against the daily consumption of tobacco among youth (15-17 years old). Because all the precautions taken would therefore allow to fight against an early consumption marijuana. For those who do not consume alcohol and drugs, efforts put on prevention and on the decrease or the total absence of their use should be narrowed down on peer pressure and the improvement of parental skills on the issue.

Submitted by Silvana Teresinha Dornelles Studzinski (sstudzinski) on 2016-08-23T14:58:40Z No. of bitstreams: 1 William Weber Dias_.pdf: 1578869 bytes, checksum: 3e91f879918babd4691cb86767895783 (MD5) / Made available in DSpace on 2016-08-23T14:58:40Z (GMT). No. of bitstreams: 1 William Weber Dias_.pdf: 1578869 bytes, checksum: 3e91f879918babd4691cb86767895783 (MD5) Previous issue date: 2016-07-01 / Nenhuma / Este trabalho buscou compreender o processo de legitimação da maconha no Uruguai. Pela primeira vez um país legaliza todos os setores do mercado de cannabis. Baseado em estudos semelhantes como a legitimação dos cassinos de apostas americanos e a mudança no mercado fonográfico com o download de musicas, o estudo segue a linha dos principais estudos de legitimação e se baseia nos pilares da teoria institucional para analisar o processo de legitimação do mercado. Com uma abordagem exploratória, a pesquisa iniciou em um processo de desk research e análise dos discursos midiáticos e em sua segunda etapa em campo buscou inspiração na pesquisa etnográfica onde foram realizadas entrevistas informais, diários de campo, observações e entrevistas qualitativas semi-estruturadas. O processo de análise e coleta de dados levou em consideração todos os atores oficiais envolvidos no novo mercado. Os resultados demonstraram um mercado com mudanças após a aprovação da lei de legalização. Com pouco mais de 2 anos de mercado legalizado, existe uma certa maturidade no mercado e competidores se diferenciando por qualidade e distribuição. No âmbito dos consumidores, esses possuem ritos de consumo e práticas estabelecidas mesmo antes da legalização, o que indica uma legitimação em processo anterior a mudança outorgada pelo presidente uruguaio Pepe Mujica. O estudo ainda abre possibilidade para outras formas de legitimação e discute com trabalhos de mesma lente teórica as diferenças e semelhanças na legitimação. Existem oportunidades de complementação já que não foram abordados temas como o narcotráfico e os malefícios que esse novo mercado pode trazer a sociedade. Os resultados apresentados são interessantes para os cidadãos uruguaios como também para demais países que buscam uma legalização em diversos mercados. Aos empreendedores e sonhadores que por vezes vislumbram a criação de um novo mercado ou lançamento de um produto. / This study intends to understand the process of legitimation of marijuana in Uruguay. For the first time a country legalizes all cannabis market sectors. Based on similar studies as the legitimation of American casinos and the change in the music industry with downloads, the study follows the line of the main studies of legitimation and is based on institutional theory to analyze the market legitimation process . With an exploratory approach, this research began in a process of desk research and analysis of media discourse and its second stage sought inspiration in ethnographic research which were conducted informal interviews, daily field, observations and semi-structured interviews. The process of analysis and data collection took into account all the official players involved in the new market. The results showed a market with changes after the approval of the legalization law. With just over two years of legalized market, there is a certain maturity in the market and competitors by differentiating quality and distribution. About consumers, these have consumption rites and practices established even before legalization, which indicates a legitimisation in previous process change granted by Uruguay's President Pepe Mujica. The study also opens the possibility for other forms of legitimation and discusses with work as a theoretical lens differences and similarities in legitimation. There are complementary opportunities as they were not addressed issues such as drug trafficking and the dangers that this new market can bring to society. The results are interesting for Uruguayan citizens but also for other countries seeking legalization in several markets. Entrepreneurs and dreamers who sometimes dream with the creation of a new market or launching a product.

This dissertation analogically applies a framework of minor literary analysis to uniquely political units of the built environment. As urbanism is conventionally understood to be executed per the greatest utility of established communal objectives, an underlying politicization is inherent as such forms must adhere to dominant norms of development which potentially marginalize those who practice cultural methods outside normative standards. Employing a uniquely architectural method of environmental justice advocacy, select communities facing disenfranchisement react by self-producing urban-architectural forms ("UAFs") to protect threatened cultural values from marginalization. Installed to subvert the existing power dynamic, such UAFs are potential exhibitions of minor architecture. Adopting the analytical standards established by Gilles Deleuze and Felix Guattari for evaluating Franz Kafka's literature, this paper tests six UAFs to discover if a minor architecture is possible under contemporary globalization. Employing an enumerated framework of minor production characteristics, an interpretive-historical analysis is the primary method of judgment regarding each unit's execution of minor architecture. Two secondary tests are undertaken to validate the primary findings, the first of which is a physio-logical evaluation that characterizes and measures urban resource utility as per collective minority aims. Second, a newspaper correlation test is undertaken so as to judge the enunciative effectiveness of each community per issues of minority politics. Of the six cases examined, two have their source in cinema including "Bartertown" of MAD MAX BEYOND THUNDERDOME (1985) and the "House on Paper Street" of FIGHT CLUB (1999). The four remaining cases include the Tibetan Government-in-Exile of Dharamsala, India; Student Bonfire of Robertson County, Texas; Isla Vista Recreation & Park District of Santa Barbara County, California; and the Emergent Cannabis Community of Arcata, California. Of all the cases studied, only the Tibetan Government-in-Exile met both the conditions of minor architecture and was validated in terms of practiced urban resource use as well as effective representation in mainstream newsprint. Both cinematic cases failed as minor productions of the built environment. Although they did not find full validation, the three remaining real-world UAFs each were found on a course of minor architectural expression at varying stages of execution.