The increasing elderly population is creating a greater need for care providers. Research indicates that while caregiving can be rewarding, it can also generate stress which, in turn, impacts individual well-being. Social support, however, may foster the well-being of persons who are experiencing stressful events. The purpose of this study was to examine the contribution of perceived social support from close family (siblings, spouse, and children) and background characteristics to well-being for a sample of women caring for mothers who were not cognitively impaired. The sample for this study (N=65) was drawn from a larger five year western Oregon study of women caregivers (Walker, 1986), and included only those women who: participated during the third year of the larger study; were married; and had at least one child and one sibling. Data were collected via face-to-face interviews. Pearson correlations and multiple regressions were used to assess the contribution of family support and background characteristics to well-being. Well-being, as measured by the CES-D scale, was the dependent variable in all regressions. The independent variables included the caregiver's self-reported health, and her perceptions of support (measured by supportiveness, positivity of contact, and conflict) from siblings, spouse, and children. Overall, results from this study indicated that women caregivers' perceptions of relationships with close family did impact their well-being. While measures designed to tap supportiveness and positivity of contact were not significantly related to well-being, conflict was. Specifically, conflict with a spouse was associated with lower well-being. Second to conflict with a spouse, respondent's health was the strongest predictor of wellbeing: poor health was significantly associated with lower well-being. In general, recommendations and implications focused on the need for: (a) repeating this type of research among other caregiver populations; (b) developing multidimensional measures of family support; (c) services that provide individuals with positive ways to deal with lifetensions that foster interpersonal conflict; and (d) services that target caregivers who are in poor health. / Graduation date: 1992

This thesis explores the influences of social networks and social support on the literacy engagement of 7 high school students from a multicultural, multilingual, and economically disadvantaged urban neighborhood in a large, diverse North American city. Specifically, this study describes (1) students’ social networks and social literacy interactions; (2) the types of social support the network relationships provide for participants’ literacy; and (3) the ways in which this socioliterate support might affect participants’ literacy engagement. Guided by Ecological Systems Theory (Bronfenbrenner, 1979, 1992/2005), at three times during an 18-month period the 7 participants completed social network maps and interviews, checklists about their reading and writing choices, and retrospective interviews about their reading and writing practices on self-selected texts. These data were analyzed on the basis of Tardy’s (1985) typology of social support and the tripartite model of engagement proposed by Fredricks, Blumenfeld, and Paris (2004), then individual case reports were created for each participant. For cross-case analysis (Stake, 2006), the individual reports were compared across similar, predetermined themes. Two primary conclusions are supported by the data and analysis: These adolescents received varying amounts and types of socioliterate support from certain members of their social networks, particularly teachers and family members, and this support positively influenced their literacy engagement when they were facing difficult or uninteresting tasks. The study provides an understanding of the relationship between social support, motivation, and engagement in single literacy events, including proposed relationships between these three concepts, as well as perspectives on the role of technology in adolescent social network formation and on the sources from whom adolescents seek literacy-based social support. The study describes pedagogical spaces that can provide and activate such literacy support and suggests topics for future research relating to adolescent literacy, socioliterate networks and support, and literacy engagement.

The Internet represents a unique opportunity for people to interact with each other across time and space, and online communities have existed long before the Internet's solidification in everyday living. There are two inherent challenges that online communities continue to contend with: motivating participation and organizing information. An online community's success or failure rests on the content generated by its users. Specifically, users need to continually participate by contributing new content and organizing existing content for others to be attracted and retained. I propose both participation and organization can be enhanced if users have an explicit awareness of the implicit social network which results from their online interactions. My approach makes this normally ``hidden" social network visible and shows users that these intangible relations have an impact on satisfying their information needs and vice versa. That is, users can more readily situate their information needs within social processes, understanding that the value of information they receive and give is influenced and has influence on the mostly incidental relations they have formed with others. First, I describe how to model a social network within an online discussion forum and visualize the subsequent relationships in a way that motivates participation. Second, I show that social networks can also be modeled to generate recommendations of information items and that, through an interactive visualization, users can make direct adjustments to the model in order to improve their personal recommendations. I conclude that these modeling and visualization techniques are beneficial to online communities as their social capital is enhanced by "weaving" users more tightly together.

University of Macau / Faculty of Science and Technology / Department of Computer and Information Science

University of Macau / Faculty of Social Sciences and Humanities / Department of Psychology

While there are exemplary studies on the relationships between social networks and media such as television and the Internet, less is known about the social network consequences of mobile phone use during life-stage transitions. This study investigates the roles that mobile phones play in supporting the relationships of young people as they transition to and through their first-year of university in Toronto, Canada. Focussing on information practices during a transition that tests the resilience of support networks, this study queried the extent to which mobile phones play a role in keeping relationships intact, enabling students to maintain a sense of social cohesion and belonging. Data were collected from November 2007 to September 2008 through a longitudinal research design. Socio-technical concepts and network analysis techniques were applied to analyze the ways in which mobile communication is embedded in the everyday social life of young people aged 17-34. Set within the culturally-specific context of urban Canada, the data provided substantial evidence that mobile phones foster social cohesion within intimate relations but provide a more tenuous platform from which to nurture new relationships. First-year undergraduates have integrated the mobile phone into the way they engage with their social networks to a considerable degree, with commuter students experiencing additional tensions in negotiating relationships from home and on-campus. Findings showed that mobile phones were the devices of choice to mitigate feelings of loneliness, with deleterious consequences for the development of new relationships. Furthermore, the mobile phone was a key contributor to a rising sense of empowerment and autonomy for young adults as they negotiated identity transformations during their rite of passage into adulthood. Issues of trust and reciprocity in forming new relationships were mediated through a continuum of social media of which the mobile phone was the most intimate. Evidence of continuous access to social networks has broader implications for how mechanisms for coping with being alone and disconnection are acquired in this generation. Finally, observations of ritualistic interaction practices involving mobile phones may be theorized as small-scale evidence of larger societal shifts from collective constructs of community to that of networked individuals.

This thesis consists of three empirical chapters that examine issues in development economics. Chapter 1 focuses on the effects of civil wars on the welfare of individuals. I use a unique data set that contains information on war casualties of the 1992-1995 Bosnian War, and exploit the variation in war intensity and birth cohorts of children, to identify the effects of the war on schooling attainment. I find that cohorts affected by war are less likely to complete secondary schooling, if they resided in municipalities that endured higher levels of war intensity. Ancillary evidence suggests that my estimates are most likely picking up immediate, rather than long-term effects. Furthermore, direct mechanisms such as the destruction of infrastructure and the out-migration of teachers do not seem to matter; instead, the ancillary evidence suggests that youth soldiering may be more important. Chapter 2 studies the impact of the partition which ended the Bosnian War on the post-war provision of public goods at the municipality-level. Comparing trends in the provision of public schooling across partitioned and unpartitioned municipalities during the 1986-2006 period, I find that partitioned municipalities provide 58 percent more primary schools and 37 percent more teachers (per capita). I also find evidence which suggests that convergent preferences - operating via ethnic politics - for ethnically oriented schools may be an important driver of the results, although I cannot rule out the possibility of mechanical explanations. In addition, as the increase in public goods provision may be ethnically oriented, only the ethnic majority profits from this arrangement. Chapter 3 provides an estimation of network effects among rural-urban migrants from Nang Rong, Thailand, by using heterogeneous migration responses to regional rainfall shocks among villagers as exogenous variation affecting network size. I find that social networks significantly reduce the duration of job search, and surprisingly, draw new migrants into the agricultural sector. I argue that this is not because agricultural jobs are more attractive than non-agricultural ones, but rather that my estimates are essentially local average treatment effects that are estimated off agricultural workers who are most affected by rainfall shocks.

Social networking extending the social circle of people has already become an important integral part of our daily lives. As reported by ComScore, social networking sites such as Facebook and Twitter have reached 82 percent of the world's online population, representing 1.2 billion users around the world. In the meantime, fueled by the dramatic advancements of smartphones and the ubiquitous connections of Bluetooth/WiFi/3G/LTE networks, social networking further becomes available for mobile users and keeps them posted on the up-to-date worldwide news and messages from their friends and families anytime anywhere. The convergence of social networking, advanced smartphones, and stable network infrastructures brings us a pervasive and omnipotent communication platform, named mobile social network (MSN), helping us stay connected better than ever. In the MSN, multiple communication techniques help users to launch a variety of applications in multiple communication domains including single-user domain, two-user domain, user-chain domain, and user-star domain. Within different communication domains, promising mobile applications are fostered. For example, nearby friend search application can be launched in the two-user or user-chain domains to help a user find other physically-close peers who have similar interests and preferences; local service providers disseminate advertising information to nearby users in the user-star domain; and health monitoring enables users to check the physiological signals in the single-user domain. Despite the tremendous benefits brought by the MSN, it still faces many technique challenges among of which security and privacy protections are the most important ones as smartphones are vulnerable to security attacks, users easily neglect their privacy preservation, and mutual trust relationships are difficult to be established in the MSN. In this thesis, we explore the unique characteristics and study typical research issues of the MSN. We conduct our research with a focus on security and privacy preservation while considering human factors. Specifically, we consider the profile matching application in the two-user domain, the cooperative data forwarding in the user-chain domain, the trustworthy service evaluation application in the user-star domain, and the healthcare monitoring application in the single-user domain. The main contributions are, i) considering the human comparison behavior and privacy requirements, we first propose a novel family of comparison-based privacy-preserving profile matching (PPM) protocols. The proposed protocols enable two users to obtain comparison results of attribute values in their profiles, while the attribute values are not disclosed. Taking user anonymity requirement as an evaluation metric, we analyze the anonymity protection of the proposed protocols. From the analysis, we found that the more comparison results are disclosed, the less anonymity protection is achieved by the protocol. Further, we explore the pseudonym strategy and an anonymity enhancing technique where users could be self-aware of the anonymity risk level and take appropriate actions when needed; ii) considering the inherent MSN nature --- opportunistic networking, we propose a cooperative privacy-preserving data forwarding (PDF) protocol to help users forward data to other users. We indicate that privacy and effective data forwarding are two conflicting goals: the cooperative data forwarding could be severely interrupted or even disabled when the privacy preservation of users is applied, because without sharing personal information users become unrecognizable to each other and the social interactions are no longer traceable. We explore the morality model of users from classic social theory, and use game-theoretic approach to obtain the optimal data forwarding strategy. Through simulation results, we show that the proposed cooperative data strategy can achieve both the privacy preservation and the forwarding efficiency; iii) to establish the trust relationship in a distributed MSN is a challenging task. We propose a trustworthy service evaluation (TSE) system, to help users exchange their service reviews toward local vendors. However, vendors and users could be the potential attackers aiming to disrupt the TSE system. We then consider the review attacks, i.e., vendors rejecting and modifying the authentic reviews of users, and the Sybil attacks, i.e., users abusing their pseudonyms to generate fake reviews. To prevent these attacks, we explore the token technique, the aggregate signature, and the secret sharing techniques. Simulation results show the security and the effectiveness of the TSE system can be guaranteed; iv) to improve the efficiency and reliability of communications in the single-user domain, we propose a prediction-based secure and reliable routing framework (PSR). It can be integrated with any specific routing protocol to improve the latter's reliability and prevent data injection attacks during data communication. We show that the regularity of body gesture can be learned and applied by body sensors such that the route with the highest predicted link quality can always be chose for data forwarding. The security analysis and simulation results show that the PSR significantly increases routing efficiency and reliability with or without the data injection attacks.

This study analyzes the official Vkontakte group of United Russia during the period of January 10 – April 10, 2013. Parliamentary majorities of United Russia have been a pillar of the Russian political regime which, despite being undemocratic, is still characterized by considerable competition. Therefore, the study draws upon the two-way symmetrical model of public relations which is compatible with the catch-all character of the party and the horizontal, open-ended nature of social networks. According to the model, an organization wishing to build an attractive image should communicate with its publics in a two-way fashion and be ready to change in accordance with people’s preferences.   The method of content analysis is employed in the study in order to establish instances of two-way communication between the members of the group and its moderators. Special attention is paid to discussions regarding legislation since such conversations can clearly evidence that the party is ready to react to ordinary people’s interests and preferences. However, according to the findings of the study, the users’ messages seldom received feedback and almost all of their suggestions and questions regarding legislation were ignored.

This dissertation examines the prevalence of friendship and its effects on productivity in academic science from the perspective of networked social capital. It seeks to understand what friendship is in the context of the professional environment, what distinguishes it from other professional relationships, and how it affects the function and the outcomes of science. The study was motivated by the increased emphasis of collaboration as a means of fostering research competitiveness. The research reported here was performed as part of the National Science Foundation project "NETWISE I: Women in Science and Engineering: Network Access, Participation, and Career Outcomes" (Grant # REC-0529642). The importance of friendship in the context of academic science has often been implied and anecdotal, but it has not been elucidated or empirically tested. This dissertation seeks to address this gap. The unit of analysis in the model is the individual. The dissertation conceptualizes friendship as one aspect of a collaborative relationship and thus an important determinant of a scientist's social capability of pool relevant resources for the purposes of productivity. It hypothesizes that professional and personal roles form an integrative relationship within collaborative ties and that such complementarity benefits individual goal attainment, specifically with regard to publication productivity. The results of the study show that friendship has a strong positive effect on an individual's publication productivity, which is comparable to the effect of collaboration across organizational boundaries. The results also show that while friendship is fairly prevalent in collaborative relationships, some groups of scientists are more likely to have friends among their closest collaborators than other groups; that friendships differ from other collaborative relationships in that they more often form between individuals of the same status, provide a greater variety of productivity-relevant resources such as knowledge, advice, endorsements of one's reputation, and introductions to potential collaborators; and that friendship facilitates the mobilization of these resources from personal collaborative networks for productivity purposes.