Abstract This thesis focuses on a systematic assessment of the feasibility and performance of situated crowdsourcing, as well as a basic understanding of the behaviours of its workers. While these aspects have been extensively studied for online and mobile crowdsourcing, this is not the case for situated crowdsourcing mainly due to its relative novelty. Such an assessment is crucial for the development of the crowdsourcing research agenda, so that task requesters and researchers alike can leverage, whenever appropriate, situated technologies for crowdsourcing efforts with more confidence. The key findings of this thesis illustrate how appropriately designed crowdsourcing tasks can perform well even in a complex deployment setting: situated technologies in public spaces. In the articles presented in this thesis, we empirically demonstrate that situated crowdsourcing performance can compete with other means of collecting crowd contributions. While situated technologies have been reported in the past to suffer from credibility and misappropriation issues, one should not forego the use of these technologies for crowdsourcing purposes assuming that the tasks are not haphazardly designed. The thesis also explores the behaviours of situated crowdsourcing workers through in-situ observations, video analysis and longitudinal individual tracking. Towards the end of the thesis, we revisit the research questions put forth in the thesis, and highlight how they were answered. We then discuss the benefits and drawbacks of situated crowdsourcing, and the differences between using non-personal and personal devices for this purpose. In both cases, the decisions made by the task requesters or researchers will ultimately depend on their goals and the task itself. We conclude the thesis by restating the thesis’ research agenda, reflecting on the challenges and opportunities of situated crowdsourcing, and our future work within this area. / Tiivistelmä Tämä väitöskirja keskittyy paikkasidonnaisen joukkoälyn käyttökelpoisuuden sekä tehokkuuden järjestelmälliseen arviointiin. Väitöskirja pyrkii myös ymmärtämään joukkoälyjärjestelmien työntekijöiden käyttäytymistä ohjaavia tekijöitä alustavalla tasolla. Paikkasidonnaisuus on tekijä, jota useimmiten verkossa tai mobiililaitteissa tehtävässä joukkotyötutkimuksessa ei ole mahdollista ymmärtää perusteellisesti. Paikkasidonnaisuus muodostaa kuitenkin elintärkeän osan joukkoälytutkimuksessa, ja sitä hyväksikäyttämällä sekä joukkotyön teettäjät että joukkoälytutkijat voivat soveltuvissa tilanteissa hyödyntää paikkasidonnaisia teknologioita luotettavamman joukkoälytiedon tuottamiseen. Väitöskirjan keskeisimmät löydökset osoittavat kuinka tarkoituksenmukaisesti toteutetut joukkoälytehtävät tuottavat luotettavaa tietoa, jopa monimutkaisissa käyttöympäristöissä kuten paikkasidonnaisia teknologioita hyödyntävissä julkisissa tiloissa. Väitöskirjan artikkelit osoittavat empiirisesti paikkasidoinnaisen joukkoälyn olevan kilpailukykyinen muiden joukkoälyteknologioiden kanssa, vaikka paikkasidonnaisten teknologioiden on aiemmin osoitettu kärsivän uskottavuuden puutteesta sekä väärinkäytöstä. Tämän väitöskirjan löydökset osoittavat, että oikein suunnitellut joukkoälytehtävät sopivat hyvin käytättäväksi kyseisten teknologioiden kautta. Suorituskyvyn sekä tehokkuuden lisäksi väitöskirjassa esitellään empiirisiin havaintoihin, videoanalyysiin, sekä yksilöiden pitkäkestoiseen tutkimukseen pohjautuvia löydöksiä joukkoälytyöntekijöiden käyttäytymismalleista. Väitöskirjan loppuosa käsittelee henkilökohtaisten ja julkisten laitteiden hyötyjä sekä haittapuolia suhteessa paikkasidonnaisten joukkoälyjärjestelmien käyttöön. Löydökset osoittavat, että kummassakin tapauksessa laitetyypin valintaa ohjaavat joukkoälytyön teettäjien tai tutkijoiden asettamat tavoitteet, sekä kyseessä olevat joukkoälytehtävät. Väitöskirjan päätteeksi palataan asetettuihin tutkimuskysymyksiin sekä vastaaviin löydöksiin, ja pohditaan paikkasidonnaisen joukkoälyn tuomia haasteita, mahdollisuuksia sekä tulevaisuuden visioita.

Vector Symbolic Architectures (VSA) combine a hypervector space and a set of operations on these vectors. Hypervectors provide powerful and noise-robust representations and VSAs are associated with promising theoretical properties for approaching high-level cognitive tasks. However, a major drawback of VSAs is the lack of opportunities to learn them from training data. Their power is merely an effect of good (and elaborate) design rather than learning. We exploit high-level knowledge about the structure of reactive robot problems to learn a VSA based on training data. We demonstrate preliminary results on a simple navigation task. Given a successful demonstration of a navigation run by pairs of sensor input and actuator output, the system learns a single hypervector that encodes this reactive behaviour. When executing (and combining) such VSA-based behaviours, the advantages of hypervectors (i.e. the representational power and robustness to noise) are preserved. Moreover, a particular beauty of this approach is that it can learn encodings for behaviours that have exactly the same form (a hypervector) no matter how complex the sensor input or the behaviours are.

Magister Philosophiae - MPhil / This study is aimed at empirically examining health seeking behaviours in terms of illness response on household level at South Africa using 2007 General Household Survey and other relevant secondary sources. It provides an assessment of health seeking behaviours at the household level using individuals as unit of analysis by exploring the type of health care provider sought, the reason for delay in health seeking and the cause for not consulting. This study also assesses the extent of dissatisfaction among households using medical centres and this factor in health care utilisation is considered as the main reason for not consulting health care services. All the demographic and health seeking variables utilised in this study are controlled for medical aid cover because it is a critical variable in health care seeking. Therefore this study makes distinction on illness reporting and they type of health care consulted by medical aid holders and non medical aid holders. Statistical analyses are conducted to explore and predict the way in which demographic variables and socio economic variables affect health care seeking behaviours. / South Africa

Philosophiae Doctor - PhD / Background: There is compelling body of evidence that coronary heart disease (CHD) risk factors are present in people of all ages. The extent to which the problem exists in university students in South Africa (SA) has not been confirmed in the literature. Furthermore, the effects of physical activity, physical fitness, diet and health behaviours on CHD risk factors has not been studied extensively in SA and needs further investigation. Aim: The aim of the study was to assess the impact of multiple behaviour health intervention strategies on CHD risk, health-related physical fitness(HRPF) and healthrisk behaviours (HRB) in first year students at the University of the Western Cape (UWC). It was hypothesized that exposure to various health behavioural interventions would reduce CHD risk factors in subjects at moderate risk, and improve health-related physical fitness, as well as health-risk behaviours.Methods and Study Design: An experimental study design was used wherein subjects at moderate risk for CHD were identified and exposed to multiple health behavioural interventions for 16 weeks in order to determine the impact of the various interventions on CHD risk, health-related physical fitness and health-risk behaviours. Population and Sample: The target population consisted of first year students at UWC aged 18 – 44 years who were screened and a sample of 173 subjects were identified as being at moderate risk for CHD. Next, the subjects were randomly assigned to a control and four treatment groups, namely, health information, diet, exercise, and a multiple group that included all three treatments. The intervention, based upon Prochaska‟s Transtheoretical Model of behaviour change, continued for a period of 16 weeks and, thereafter, the subjects were retested. Data Collection Process: Subject information was obtained using self-reported questionnaires, namely, the physical activity readiness questionnaire (PAR-Q), the stages of readiness to change questionnaire (SRCQ), the international physical activity questionnaire (IPAQ), and the healthy lifestyle questionnaire (HLQ), together with physical and hematological (blood) measurements. The measurements taken before and after the intervention programme were the following:• Coronary heart disease risk factors, namely: family history, cigarette smoking, hypertension, obesity, dyslipidemia, impaired fasting glucose and a sedentary lifestyle; • Health-related physical fitness, namely: body composition, cardiovascular fitness, muscular strength, muscular endurance, and flexibility; and • Health-risk behaviours, namely: physical activity, nutrition, managing stress, avoiding destructive habits, practising safe sex, adopting safety habits, knowing firstaid, personal health habits, using medical advice, being an informed consumer, protecting the environment and mental well-being. Types of interventions: A control group was used in which subjects did not receive any treatment. The health behavioural interventions were arranged into four groups of subjects that received either the health information, diet, exercise or a combination of all three individual treatments. Statistical analyses of data: In the analyses of the data, the procedure followed was that where the outcome variable was approximately normally distributed, the groups were compared using a two-sample t-test. For outcomes with a highly non-normal distribution or ordinal level data, the nonparametric Wilcoxon Rank Sum test was used for group comparisons. To account for baseline differences, repeated measures analysis of variance was used. In the case where nonparametric methods were appropriate, analysis was done using Cochran-Mantel-Haenszel (CMH) methodology stratifying on the baseline values. For the case of nominal level outcomes, groups were compared by Chi-square tests for homogeneity of proportions. When baseline values needed to be incorporated into the analysis, this was done using CMH methodology. Main Outcome Measures: The main outcome measures tested in the study related to the three areas of investigation, namely: • Modifiable CHD risk factors: systolic and diastolic blood pressure, cigarette smoking, total cholesterol (TC) concentration, high-density lipoprotein (HDL) cholesterol concentration, low-density lipoprotein (LDL) cholesterol concentration, triglycerides, fasting glucose, body mass index, waist circumference, waist-hip ratio and physical inactivity; • Health-related physical fitness: body mass, percent body fat, absolute body fat, percent lean body mass, absolute lean body mass, the multi-stage shuttle run, handgrip strength, repeated sit-ups in a minute, and the sit-and-reach test; and • Health-risk behaviours: physical activity, nutrition, managing stress, avoiding destructive habits, practising safe sex, adopting safety habits, knowing first aid, personal health habits, using medical advice, being an informed consumer, protecting the environment and mental well-being. Results: The results showed significant decreases for body mass, waist and hip circumferences, resting heart rate, systolic blood pressure, cigarette smoking and a sedentary lifestyle (p < .05) primarily in the multiple group. No significant differences were recorded for blood biochemistry, however, favourable trends were observed in the lipoprotein ratios. For health-related physical fitness, only the multiple group showed significant (p < .005) improvements in predicted maximal oxygen consumption ( O2max), body composition, muscular strength and muscular endurance. The exercise group also recorded significant differences in muscular endurance. In all groups, including the controls, no significant differences were found for stature, waist-hip ratio, and flexibility at pre- and post-test. Overall, the participants reflected positive health behaviours, especially for managing stress, avoiding destructive habits, practising safe sex, adopting safety habits, personal health habits and mental well-being at pre- and post-test. The intervention programme had a corrective influence on providing the participants with a more realistic perception of their level of physical activity and nutritional habits. The participants scored poorly on being informed consumers and for recycling waste both at pre- and post-test. A substantial net reduction in CHD risk factors as well as in cumulative risk was achieved with treatment that impacted positively on the re-stratification of participants at moderate risk. In terms of treatment efficacy, the dietary intervention appeared to be the least effective (10.91%), with health information and exercise sharing similar levels of efficacy (32.81% and 33.93%, respectively) and, the combined treatment in the multiple group stood out as the most effective treatment (50.00%), and supported the hypothesis of the study. Conclusions: The net and cumulative decline in CHD risk factors was substantial with treatment and was directly related to the number of treatments administered. The evidence suggests that such multiple health behaviour interventions when implemented through a university-based setting have substantial benefits on reducing CHD risk and may be of considerable public health benefit. Key messages • Despite being a relatively educated population, a substantial number of first year university students are at considerable heart disease risk. • Physical inactivity constitutes one of the main CHD risk factors amongst first year students and, together with smoking, place many of them at moderate CHD risk. • The effectiveness of health behavioural strategies designed to modify lifestyle and prevent coronary heart disease is supported by this study.

A growing consensus on suitability of Strategic Entrepreneurship (SE) for firms to face challenges in a competitive environment is anchored on the argument that SE is an intersection of entrepreneurship and strategic management associated with opportunity-seeking and advantage-seeking behaviours. However, this concept is flawed by failure of firms to simultaneously combine opportunity-seeking and advantage-seeking behaviours to attain and sustain performance, a situation that raised contentions on the relevance of constructs chosen to build SE. Recently, other scholars suggested that SE is more than interface between strategic management and entrepreneurship and treat this fusion as a debatable idea. This argument presents a conceptual gap which triggered this study. This study examined three constructs namely: Market Orientation (MO), Entrepreneurial Orientation (EO) and Networking Capability (NWC), which are collectively referred to as dimensions of Strategic Entrepreneurial Response (SER) as appropriate constructs to enhance simultaneous opportunity-seeking and advantage-seeking behaviours. With the understanding that these constructs were collectively used for the first time to study SER, this study examined if their individual dimensions could successful measure SER, and if they are related to SME performance. Also, examined how much variance in SME performance is explained by scores of the dimensions of SER and whether the interaction of the dimensions of SER explains a significant amount of variance in performance to enhance simultaneous opportunity-seeking and advantage-seeking behaviours. In the course of the study, a cross-sectional research design was used to collect data from SME’s in Tanzania of which 291 SME owners/managers were randomly selected and interviewed in three types of industries namely: manufacturing, service and retail. A factor analysis after oblique rotation revealed 9 factors and explained 68.16% of total variance. The identified factors were customer orientation, competitor orientation (market orientation), pro-activeness, risk taking, competitive aggressiveness (entrepreneurial orientation), relational skills, internal communication, coordination and partner’s knowledge (networking capability). Subjecting the nine factors into the second order factor analysis converged into a single component suggesting successful measuring SER. The findings confirmed a relationship between dimensions of SER and SME performance suggesting that emphasis on market orientation, entrepreneurial orientation and networking capability enhance SME performance. However, the interaction of the three dimensions only market orientation and entrepreneurial orientation explained significant amount of variance in SME performance, with large amount of variance accounted for by the market orientation. The findings suggest that emphasis on market orientation is a firm’s strategic choice to generate strategic information which forms a seedbed of opportunities from which entrepreneurial oriented firms identify and proactively seize to build competitive advantage. Contrary to previous studies, which emphasized that opportunity seeking is a domain of entrepreneurial orientation, this study argues that previous studies underplayed the role of market orientation on opportunity seeking. This study views entrepreneurial orientation as more driven by opportunity exploitation which is more of advantage seeking than opportunity seeking. This study suggest that sustained market orientation and entrepreneurial orientation cultures build opportunity seeking and advantage seeking behaviors crucial to create and sustain SME performance. / Thesis (PhD)--University of Pretoria, 2013. / Business Management / unrestricted

Insomnia is a common health complaint that often becomes a persistent problem. The theoretical frameworks for understanding and treating insomnia have mostly been behavioural, yet the importance of cognitive processes has received greater attention over the years. The overall aim of this dissertation was to expand the knowledge on the processes from the Cognitive Model of Insomnia by investigating them in novel contexts. Study I examined the outcomes from cognitive therapy for insomnia on adolescents. Study II explored the relationship between cognitive processes and the association with remission and persistence of insomnia in the general population. Lastly, Study III investigated if cognitive processes mediated between cognitive behavioural therapy for insomnia (CBT-I) and outcomes of insomnia and depressive severity in a sample of people with insomnia comorbid with depressive problems. The findings show that cognitive therapy for insomnia affected sleep for adolescents, thus this is a promising treatment option for this age group. Further, it was found that cognitive processes distinguished between adults with normal sleep and persistent insomnia. For people with insomnia, elevated sleep-related worry at baseline increased the risk of reporting persistent insomnia later on, whereas a lowering of selective attention and monitoring, and safety behaviours over time increased the likelihood of remission from insomnia. This has clinical implications for insomnia assessment and treatment, as well as theoretical implications, and warrants further research. CBT-I was associated with greater reductions in dysfunctional beliefs and sleep-related safety behaviours compared to control treatment. Dysfunctional beliefs mediated between CBT-I and insomnia severity and depressive severity respectively. This supports the importance of negative thought content in both insomnia and depression.

Objectives: The aim of this thesis is to study the association between social relations and health in different social spheres, and to examine possible interaction effects. Material and Methods: In Paper I, the link between measures of the psychosocial neighbourhood environment, the psychosocial working environment, and psychosomatic health is analyzed by using a subset of data from the survey Life and Health 2000. In Paper II, the association between adolescent social relationships in school and psychosomatic health was analyzed by using the survey Young in Värmland. In Paper III, the association between parental monitoring, peer activity frequency, and adolescent alcohol use was studied by using Young in Värmland as the data source. In Paper IV, the links between adolescent perceptions of the psychosocial school climate, activities with parents, and psychosomatic health, were analysed by using Young in Värmland as the data source. Results: The results from Paper I indicate that social relations in the neighbourhood environment, as well as the working environment, are independently related to psychosomatic health. The independent contributions imply that efforts to improve health can be successfully directed to the psychosocial neighbourhood environment, as well as to the psychosocial working environment. The results from Paper II show that the social relations adolescents have in school may differ between subgroups of adolescents. The health effects of teacher contacts were stronger for the theoretically oriented students compared to the non-theoretically oriented students, suggesting that adolescents should be considered a heterogeneous group rather than a homogeneous one with respect to their social relations in school. Efforts to improve equity in health should consider these differences in order to be successful. In Paper III the results imply that even though both parents and the peer group are important in order to understand the alcohol use patterns of adolescents, the importance of parents should not be underestimated. Parental monitoring had a protective effect on adolescent alcohol use, regardless of the frequency of peer activities. In Paper IV, both the psychosocial school climate, and the frequency of activities with parents were related to psychosomatic health. The positive health effects of the psychosocial school climate were, furthermore, reinforced as a function of the frequency of activities with parents. This suggests that efforts to improve health should be directed to the school environment as well as to the family environment in order to be successful. Conclusions: The importance and meaning of social relations differ between different social arenas as well as between sub-groups of individuals.

In the 21st century, the mobility of world population has posed greater challenges to healthcare practitioners, since they are facing an increasingly diverse patient population from all over the world. At the same time, patients also find it difficult to access and utilize quality health care services in a culturally diverse context. This study examines the role of culture in Chinese international students’ health-seeking behaviours in Canada. The study explores any barriers/perceived barriers that Chinese international students may confront when accessing health care which can prevent them from obtaining quality health care services in Canada. To this end, an intercultural health communication model was employed as a theoretical framework, and semi-structured interviews were used as a data collection tool. While contributing to existing literature on health communication and culture, this study also hopes to contribute to providing Canadian universities and institutions important information regarding Chinese international students’ access to and utilization of health care services with the hope of enhancing the quality of ethnic health care and promoting better health outcomes.

Background: Pregnancy has been described as a period when women experience heightened behavioural surveillance. Young single women have commonly been described as a population who engage in high risk behaviours during pregnancy (e.g. smoking), yet they are also a population who often has access to fewer resources to make expected behaviour changes during pregnancy. Purpose: To explore the experiences of young single pregnant and parenting women regarding behavioural expectations and behaviour change during pregnancy. Research Questions: (1) What are the perceived behavioural expectations for young single women during pregnancy? (2) Who or what reinforces the perceived behavioural expectations? (3) To which behavioural expectations do young single women conform (or resist) and why? Methods: Nine single pregnant or parenting women between the ages of 15 and 24 were recruited from two urban community health settings between November 2011 and January 2012. Data was collected through individual semi-structured photo-elicitation interviews and analyzed using qualitative content analysis. Results: The main findings of the study include: (1) young single pregnant women are subject to a multitude of health and social behavioural expectations, (2) young single women experience internal and external behavioural surveillance during pregnancy, and (3) young single pregnant women experience these behavioural expectations as a tension between the potential for opportunity and oppression. Implications for Practice: By understanding young single pregnant women’s perceptions of how they are expected to behave, who and what reinforces such expectations, and how young women conform to or resist such expectations, the results of this project will inform the development of effective individual, community, and systemic level interventions and better inform interactions with young pregnant women.

The goal of this thesis was to reposition individual preparedness within a social environmental context. First, a theoretical model was developed to more accurately represent the social environmental considerations neglected in current preparedness research and policy. A series of three studies tested this model using a mixed-methods approach: First, subjective conceptualizations of preparedness were explored in a qualitative analysis (N = 12). Findings revealed that participants evaluated their readiness not in terms of prescribed activities, but perceptions about their current resourcefulness as well as past local hazards. Participants’ had positive social environments which also reinforced their perceived coping ability in future emergency events. Subsequent thesis studies investigated the role social environment further, using quantitative data. The second study explicitly tested whether perceptions of risk and coping could explain differences in preparedness based on demographic attributes linked to variations in social environment. Data from a survey examining Canadians perceptions regarding terrorism threats (N = 1503) revealed that greater anticipated response was significantly associated with increased age, as well as female gender, higher education levels, and higher income levels. Statistically significant differences in threat appraisals were also reported based on these demographic groupings. However, mediation analyses demonstrated that with the exception of gender, differences in anticipated response could not be explained via risk perceptions or perceived coping efficacy, suggesting that social environment’s role in preparedness is not related to the internal processes often targeted in current campaigns. The third study used a multilevel design to investigate the contextual role of neighbourhood social environment in anticipated emergency response. Results demonstrated that a more deprived social neighbourhood context was related to lowered anticipated emergency response. This relationship was maintained after controlling for significant individual-level factors such as previous experience and sociodemographics, highlighting the importance of neighbourhood social context in facilitating emergency preparedness. Taken together, these findings provide novel evidence that focusing preparedness strategies to primarily target internal processes is misguided, and that future research and policy must position preparedness efforts in the context of existing social environmental resources and barriers in order to build capacity for effective emergency response.