Predição de Links é uma área de pesquisa importante no contexto de Análise de Redes Sociais tendo em vista que predizer sua evolução é um mecanismo útil para melhorar e propiciar a comunicação entre usuários. Nas redes de coautoria isso pode ser utilizado para recomendação de usuários com interesses de pesquisa comuns. Este trabalho propõe um processo sistemático baseado em métricas não-dicotômicas para avaliação de predição de links em redes de coautoria, sendo considerada a definição de métodos para as seguintes tarefas identificadas: seleção de dados, determinação de novos links e avaliação dos resultados. Para seleção de dados definiu-se um sensor fuzzy baseado em atributos dos nós. O uso de composições fuzzy foi considerado para determinação de novos links _ponderados_ entre dois autores, adotando-se não apenas atributos dos nós, mas também a combinação de atributos de outros links observados. O link ponderado é denominado _qualidade da relação_ e é obtido pelo uso de propriedades estruturais da rede. Para avaliação dos resultados foi proposta a curva ROC fuzzy, que permite explorar os pesos dos links não apenas para ordenação dos exemplos. / Link prediction is an important research line in the Social Network Analysis context, as predicting the evolution of such nets is a useful mechanism to improve and encourage communication among users. In co-authorship networks, it can be used for recommending users with common research interests. This work proposes a systematic process based on non-dichotomic metrics for evaluation of link prediction in co-authorship networks considering the definition of methods for the following tasks: data selection, new link determination and result evaluation. Fuzzy sensor based on node attributes is adopted for data selection. Fuzzy compositions are used to predict new link weights between two authors, adopting not only attributes nodes, but also the combination of attributes of other observed links. The link weight called _relation quality_ is obtained by using structural features of the social network. The fuzzy roc curve is used for results evaluation, allowing us to consider the weights of the links and not only the ordering of examples.

In this thesis, topologically massive Yang-Mills theory is studied in the framework of geometric quantization. This theory has a mass gap that is proportional to the topological mass m. Thus, Yang-Mills contribution decays exponentially at very large distances compared to 1/m, leaving a pure Chern-Simons theory with level number k. The focus of this research is the near Chern-Simons limit of the theory, where the distance is large enough to give an almost topological theory, with a small contribution from the Yang-Mills term. It is shown that this almost topological theory consists of two copies of Chern-Simons with level number k/2, very similar to the Chern-Simons splitting of topologically massive AdS gravity model. As m approaches to infinity, the split parts add up to give the original Chern-Simons term with level k. Also, gauge invariance of the split CS theories is discussed for odd values of k. Furthermore, a relation between the observables of topologically massive Yang-Mills theory and Chern-Simons theory is obtained. It is shown that one of the two split Chern-Simons pieces is associated with Wilson loops while the other with 't Hooft loops. This allows one to use skein relations to calculate topologically massive Yang-Mills theory observables in the near Chern-Simons limit. Finally, motivated with the topologically massive AdS gravity model, Chern-Simons splitting concept is extended to pure Yang-Mills theory at large distances. It is shown that pure Yang-Mills theory acts like two Chern-Simons theories with level numbers k/2 and -k/2 at large scales. At very large scales, these two terms cancel to make the theory trivial, as required by the existence of a mass gap.

My research area is applications of topology to biology, especially DNA topology. DNA topology studies the shape and path of DNA in three dimensional space. My thesis relates to the study of DNA topology in a protein-DNA complex by solving tangle equations and calculating distances between DNA knots.

This work explores the use of hydroinformatics tools to provide a user friendly and accessible interface for executing and visualizing the output of distributed hydrological models for Iowa. It uses an IFIS-based web environment for graphical displays and it communicates with the ASYNCH ODE solver to provide input parameters and to gather modeling outputs. The distributed hydrologic models used here are based on the segmentation of the terrain into hillslope-link hydrologic units, for which water flow processes are represented by sets of nonlinear ordinary differential equations. This modeling strategy has shown promising results in in modeling extreme flood events in the state of Iowa – USA. The usage and evaluation of outputs from hillslope-link models (HLM) has been limited to a restrict group of academics due to the demand of high processing capability and the number of customized tools needed to visualize model outputs. HLM-based models provide abundant output information on rainfall-runoff processes of the hydrological cycle, including estimates of discharge for all streams in the state of Iowa, and for all conceptual vertical layers of water storage in soils. The interfaces and methodologies developed in this thesis respond to the constant demand for communicating effectively water-related information from academic communities to the public using hydroinformatics tools to provide an accessible portal to the information generated by complex hydrological models. It also facilitates model development and evaluation by allowing rapid development of what-if scenarios. This work represents a significant advance in this direction, and the results have been made publicly available online under the URL http://ifis.iowafloodcenter.org/ifis/sc/modelplus/.

The global rise of anti-vaccination movements has led to serious consequences for the public health such as the recent measles outbreak in the United States. The increased promotion of misleading information on vaccinations by social media influencers as well as by media outlets seems to have resulted into a more negative view on vaccinations. The popularity of these social media influencers and the good reputation and authority of the media outlets could have played a substantial role in these developments. The following experimental study will try to explore whether popularity or authority cues can have an impact on the evaluation of the credibility of these two types of sources via an online survey. Furthermore, it aims to examine whether said heuristic cues and resulting conformity effects or the source credibility in general could have an impact on the opinion of recipients on a potential autism-vaccination link. Results have shown that especially authority cues seem to have a positive impact on source credibility evaluations. Furthermore, a high general trust in the media positively influences assessments of source credibility of well-established news outlets. Popularity cues as well as authority cues seem to have a positive effect on the recipients´ opinion. However, authority cues and the resulting effects of informational conformity seem to lead to greater attitude changes. Particularly people with a high need for conformity exhibit considerable attitude changes when exposed to the well-established news outlet as a source. Also, a high perceived source credibility is positively correlated with a desired attitude change. Especially the high perceived credibility of the social media influencer resulted in significant attitude changes. The results underline the importance and positive impact that a perceived authority can have on source credibility assessments and on recipients’ opinions. This highlights the great necessity for self-proclaimed experts on social media platforms and particularly for well-established news outlets to increase their effort to thoroughly and accurately research health-related topics.

A homology theory is defined for equivalence classes of links under isotopy in the 3-sphere. Chain modules for a link L are generated by certain surfaces whose boundary is L, using surface signature as the homological grading. In the end, the diagramless homology of a link is found to be equal to some number of copies of the Khovanov homology of that link. There is also a discussion of how one would generalize the diagramless homology theory (hence the theory of Khovanov homology) to links in arbitrary closed oriented 3-manifolds.

Doctor of Philosophy / Grossarth-Maticek and Eysenck (1988) demonstrated that personality type as measured by the 70-item Grossarth-Maticek Personality Stress Inventory (GMPSI), predicts mortality and its cause with remarkable accuracy. Further, various forms of autonomy training, such as bibliotherapy and short individual treatment that were designed to reduce the toxic personality features (such as emotional dependence) effectively improved long-term health outcomes. However, several aspects of their theory and research were either insufficiently explicated or require further investigation. For example, the researchers did not thoroughly investigate the psychometric properties of the inventory, and they did not sufficiently examine the mechanisms that may mediate the personality-health relationship. Further, the autonomy training was inadequately described, and perhaps could have been briefer and had the same impact. Three studies were run to investigate these issues further. Study 1 (Chapter 2) investigated the internal consistency, test-retest reliability and convergent, discriminant and concurrent validity of the GMPSI in 312 first-year students, using a variety of statistical techniques (e.g., structural equation modeling, confirmatory factor analysis, and simple correlations). In addition, the psychometric properties of this scale were compared to those of three revised versions of the scale, which were theorised to be psychometric improvements of the original version from basic principles. The revised versions contained reverse-worded items (of different types) to monitor and disrupt acquiescence response sets, and/or an extended response scale to improve internal consistency and stability. Psychometric effects of reverse-wording and the extended response scale on scale reliability were examined via the analysis of construct reliability estimates, personality subscale model fit of congeneric measurement models (a form of structural equation modeling), and test-retest reliability estimates. The original version of the scale appeared to be the most reliable and valid scale of the four versions. This improved reliability of the original version was not an artifact of an acquiescence response set, because this form of responding was not prevalent in the reverse-worded versions. In contrast, it appeared that the incorporation of reverse-wording degraded the internal consistency of the scale as participants appeared to respond to the positive and negative-worded items as if they were measurements of independent constructs, rather than measurements of constructs on opposite ends of a particular dimension. Predicted correlations between the GMPSI and concurrent validity measures offered support for Grossarth-Maticek's theory, and suggest that the GMPSI is an effective and reliable tool for the measurement of these personality types. However, experimental evidence supporting the link between personality, mediating mechanisms and disease is required to further substantiate these findings. The second and third studies (Chapters 3 and 4, respectively) were investigations of the utility of an information pamphlet discussing stress, assertiveness and relaxation, in improving GMPSI personality type stress responses in a student and a community sample (Studies 2 and 3 respectively), and provided an opportunity to investigate the mechanisms mediating the personality-health relationship via experimental manipulation. Specifically, Study 2 investigated the effectiveness of the pamphlet in improving personality scores, mood, coping strategies, health behaviours, and salivary cortisol levels (measured at pre-treatment, 1-month post-treatment and 5-months post-treatment) in 200 first-year university students. Further, two modes of administration of the pamphlet were compared: pure selfadministration versus instruction accompanied by self-administration. Group differences in mood and cortisol reactivity to a visualisation stress task were also assessed. Very few significant differences were found between the two pamphlet administration forms. Both pamphlet forms were effective in improving mood states, some lifestyle habits (e.g., exercise), and salivary cortisol responses to the acute stress task compared to the control group. The strength of these effects ranged from small to medium, and all significant differences were between pre-treatment and the 1-month post-treatment session. The failure to observe differences at the 5-months post-treatment session may have been due to inadequacies of the treatment, or low statistical power for detecting effects from the final session due to the large attrition rate that had occurred by this session. Overall, while large treatment effect sizes were not found, the results could be construed as "clinically" significant when taking into account the low costs of implementing an information pamphlet in the larger community, and the potential benefits on individuals' stress responses and health behaviours. Study 3 aimed to investigate the treatment effects of the same self-administered pamphlet in 77 participants from the general community, who varied largely in age (19 - 77 years). Treatment and control groups were compared in terms of treatment compliance, cortisol levels, health behaviours, personality scores, perceived stress, mood, and coping styles (measured at pre-treatment, 2 weeks posttreatment, 3 months post-treatment, and 6 months post-treatment). In addition, group differences in cortisol reactivity to an acute cognitive stress task were examined. Home visits were arranged for each session to reduce sample attrition. Further, an intervention evaluation form was administered at each post-treatment session to verify and maintain treatment involvement. Several significant treatment effects were observed, including changes in personality scores and non-productive coping strategies, and the strength of these effects ranged from medium to very large. Most participants reported that they found the information pamphlet very appealing and helpful. In addition to the examination of intervention effects in the second and third studies, a path model that aimed to identify direct and mediating relationships between personality and concurrently measured disease was examined for the two samples (Chapter 5). This path model was based on a new integrative theory of personality-disease, which was developed. Eysenck's (1991) proposed personality-disease model formed the foundation of this new theory, and elements of several other generic personality-disease models were also incorporated. This theory was empirically tested using path analysis on the student and community data separately. Common pathways in the two models were then tested for invariance. Overall, most paths proposed by the integrative model were identified in one or both samples; thus, the model was generally supported. All common direct paths were statistically invariant (i.e., equivalent) in the two samples. While personality did not appear to directly predict illness, several significant indirect pathways were identified by which personality appears to affect disease incidence, such as via perceived stress, mood, coping styles, and physical risk factors. These findings appear to support Grossarth-Maticek's theory that personality affects disease incidence via stress responses, as well as other generic approaches (i.e., the personality-induced hyperreactivity model and the stress moderator model) that emphasise the stress-moderating effects of personality on health. However, support for the dangerous behaviours model was not found, which posits that certain personality dispositions seek risky behaviours (e.g., poor health behaviours such as smoking and alcohol consumption) that fit their personality. The final Chapter 6 directly compares the results of these three studies, and discusses their practical and theoretical significance in terms of Grossarth-Maticek's theory and research, views of critics, and other personality-health perspectives and research. In summary, the current studies appear to suggest that the GMPSI is a reliable and valid scale for the measurement of particular personality traits. Further, there appears to be evidence to suggest that personality traits can be changed by an intervention pamphlet. This information pamphlet also appears to be effective in significantly improving responses to stress, and these effects are more prominent in high-risk groups (i.e., subjects with extreme personality trait scores). Moreover, there is some evidence to suggest that personality may have direct effects on several mechanisms involved in the development of disease. Overall, this thesis demonstrates the importance of recognising the role of personality and stress in disease prevention and prediction by providing independent evidence for the benefits of treatment and mechanisms by which benefits may occur.

La théorie d'invariants de type fini des 3-variétés et leurs entrelacs de Goussarov-Habiro repose sur le calcul de claspers, un ensemble d'outils de calcul topologique. Dans cette thèse, on calcule explicitement les invariants en bas degré pour certaines classes d'objets, par une méthode dite graphique. Nous étudions ainsi les cylindres d'homologie sur une surface à 0 ou 1 composante de bord et les string-links framés des boules d'homologie. Leurs invariants de degré 1 sont caractérisés en termes d'invariants classiques, et une correspondance est établie entre les deux cas. On regarde aussi les invariants de Vassiliev des string-links, du point de vue des claspers. Le calcul des invariants de degré 2 implique la construction d'un certain invariant des string-links à 2 cordes. Le lien entre invariants de Vassiliev et de Goussarov-Habiro est étudié pour les string-links.

<p>This master thesis has been done at Enea Epact AB. The purpose of this thesis is to develop and implement a Link Quality Control algorithm for GPRS/EPGRS in the current testing tool. A Link Quality Control (LQC) shall take quality values from mobile stations and base stations and decide a codingsscheme that opimizes the throughput of data. </p><p>The Advantage with LQC is that it adapts the used coding scheme to the channel quality. If the channel quality is too bad for the used coding scheme, a slower coding scheme with more redundancy should be selected. On the other hand, if the channel quality is too good for the used coding scheme, LQC should recommend a faster coding scheme with less redundancy. </p><p>The testing tool is now using a static coding schme that doesn’t change during a data session. An LQC is therefore necessary for better simulation of the traffic and to make the tests more real.</p>

<p>The local newspapers in Sweden are often used as an arena where groups of different political leanings try to frame current events to suit their purposes. Therefore how the news media presents the discussed issue and how it relates to sustainable development are important for a democratic process. One of the largest infrastructural projects in Sweden currently is the Eastern Link and there are many economical, social and ecological concerns when constructing such a large infrastructural project. It is therefore important to look at how sustainable development is represented in the local news media when concerning this infrastructural project. The aim of this thesis is to study how the local media presents the Eastern Link project in relation to sustainable development and how it affects democracy. This thesis critically discusses the different parts of sustainable development; the impact of and on economical issues, social issues and ecological issues in relation to the study material. Both a quantitative approach and a qualitative approach are used as a method. The thesis also links the results of this study to previous research on communication and theories on sustainable development. The results show that neither of the newspapers Folkbladet or NT is presenting the Eastern Link in a balanced way from a sustainability perspective. A majority of the articles are focusing on the social discourse; this differs from previous research where the focus is on the economical discourse.</p>