2,001 research outputs found

    Disentangling 'social supply' : a personal network study into the social world of cannabis use and its supply

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    Research into the horizontal complexity of drug markets does not only suggest there are different types of drug markets, but also indicates that within these drug markets a wide variety of dealers or suppliers operate. The concept ‘social supply’ was developed in the 2000s to capture these ‘other’ forms of supply. ‘Socail supply’ refers to a supply that is ‘non-commercial’ and happens between ‘non-strangers’. This study aims to contribute to the theoretical debate on the conceptualisation of ‘social supply’. It thereby also aims to explore why social supply is described as social by young recreational cannabis users and their suppliers. During a computer-assisted interview, 50 young recreational cannabis users drew their personal network maps. Based on the results, a two-dimenstional conceptualisation of (social) supply is put forward. This definition shows the continued relevance of theories on group processes. Aside from these groups processes, an explanation for this particular way of defining appears to include a proces of normifciation

    Understanding Attitudes towards Performance in Knowledge-intensive Work: The Influence of Social Networks and ICT Use

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    Understanding factors that enhance or diminish performance levels of individuals is instrumental for achieving individual (low level) and organisational (high level) goals. In this study, the effect of social network structure, position, ties and information and communication technologies (ICT) use on performance attitudes of knowledge intensive workers in dispersed occupational communities is investigated. Based on social network theories of strength of weak ties and structural holes, and the social influence model of technology use, a theoretical framework is developed. In conjunction with qualitative interviews conducted with subject matter experts, the framework is used to further develop and refine a valid and reliable survey instrument. Secondly, network measures of degree centrality, density, structural holes (constraint and efficiency), tie strength and tie diversity are applied for exploring the association with ICT use and performance from a sample of 110 rural general practitioners. Empirical results suggest that network structure, position and ties of knowledge workers play a crucial role in individual performance and ICT use. In particular, degree centrality and task-level ICT use was found to be positively associated with performance while ego-network constraint was found to be negatively correlated with performance. In terms of ICT use, functional diversity and degree centrality were positively associated with task-level ICT use whereas ego-network efficiency was found to be negatively correlated with ICT use at the communication-structure level. Among the variables that showed significance, degree centrality best explained overall variance for performance, and functional diversity best explained overall variance for task-level ICT use, although professional accreditations remains a potent indicator also. The results from this study resonate with findings from past literature and extend traditional theory of social networks and performance within the micro level to include geographically dispersed individuals involved in knowledge intensive work. For individuals in such non-competitive settings, traditional network theories such as structural holes theory still apply. However, a key finding is that network structure is a much more potent predictor of performance although network position is important. The second key finding addresses a major gap in the literature concerning understanding social processes that influence ICT use. As the technology acceptance and the social influence models lack empirical evidence from a social networks perspective, this research shows that rather than the strength of ties which functions as a conduit of novel ideas and information, it is the functional tie diversity within individual professionals networks that increase ICT use at the task-level. Methodologically, the study contributes towards a triangulation approach that utilises both qualitative and quantitative methods for operationalising the study. The quantitative method includes a non-traditional “networks” method of data collection and analysis to serve as a fine complement to traditional research methods in behavioural studies. The outcome is a valid and reliable survey instrument that allows collection of both individual attribute and social network data. The instrument is theoretically driven, practically feasible to implement, time-efficient and easily replicable for other similar studies. At the domain level, key findings from this study contradict previous literature which suggests that professionals in occupational communities such as general practitioners decline in performance as they age. In fact, findings from this study suggest that age and experience do not affect for performance; rather, there is a negative relationship between experience and task-level ICT use, and that task-level ICT use is positively associated with performance in terms of attitudes to interpersonal care. Furthermore, degree centrality is also positively associated with professional accreditations, such as fellowship of the Royal Australian College of General Practitioners, which is conducive to performance in terms of attitudes to interpersonal and technical care. The contextual implication from the quantitative and qualitative evidence of this study is that while contemplating strategies for optimising ICT use or for improving attitudes to quality of care at the technical and interpersonal level, the importance of social structure, position and relations in the practitioner’s professional network needs to be considered carefully as part of the overall individual and organisation-level goals

    Measures of Privacy Protection on Social Environments

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    Tesis por compendio[EN] Nowadays, online social networks (OSNs) have become a mainstream cultural phenomenon for millions of Internet users. Social networks are an ideal environment for generating all kinds of social benefits for users. Users share experiences, keep in touch with their family, friends and acquaintances, and earn economic benefits from the power of their influence (which is translated into new job opportunities). However, the use of social networks and the action of sharing information imply the loss of the users’ privacy. Recently, a great interest in protecting the privacy of users has emerged. This situation has been due to documented cases of regrets in users’ actions, company scandals produced by misuse of personal information, and the biases introduced by privacy mechanisms. Social network providers have included improvements in their systems to reduce users’ privacy risks; for example, restricting privacy policies by default, adding new privacy settings, and designing quick and easy shortcuts to configure user privacy settings. In the privacy researcher area, new advances are proposed to improve privacy mechanisms, most of them focused on automation, fine-grained systems, and the usage of features extracted from the user’s profile information and interactions to recommend the best privacy policy for the user. Despite these advances, many studies have shown that users’ concern for privacy does not match the decisions they ultimately make in social networks. This misalignment in the users’ behavior might be due to the complexity of the privacy concept itself. This drawback causes users to disregard privacy risks, or perceive them as temporarily distant. Another cause of users’ behavior misalignment might be due to the complexity of the privacy decision-making process. This is because users should consider all possible scenarios and the factors involved (e.g., the number of friends, the relationship type, the context of the information, etc.) to make an appropriate privacy decision. The main contributions of this thesis are the development of metrics to assess privacy risks, and the proposal of explainable privacy mechanisms (using the developed metrics) to assist and raise awareness among users during the privacy decision process. Based on the definition of the concept of privacy, the dimensions of information scope and information sensitivity have been considered in this thesis to assess privacy risks. For explainable privacy mechanisms, soft paternalism techniques and gamification elements that make use of the proposed metrics have been designed. These mechanisms have been integrated into the social network PESEDIA and evaluated in experiments with real users. PESEDIA is a social network developed in the framework of the Master’s thesis of the Ph.D. student [15], this thesis, and the national projects “Privacy in Social Educational Environments during Childhood and Adolescence” (TIN2014-55206- R) and “Intelligent Agents for Privacy Advice in Social Networks” (TIN2017-89156-R). The findings confirm the validity of the proposed metrics for computing the users’ scope and the sensitivity of social network publications. For the scope metric, the results also showed the possibility of estimating it through local and social centrality metrics for scenarios with limited information access. For the sensitivity metric, the results also remarked the users’ misalignment for some information types and the consensus for a majority of them. The usage of these metrics as part of messages about potential consequences of privacy policy choices and information sharing actions to users showed positive effects on users’ behavior regarding privacy. Furthermore, the findings of exploring the users’ trade-off between costs and benefits during disclosure actions of personal information showed significant relationships with the usual social circles (family members, friends, coworkers, and unknown users) and their properties. This allowed designing better privacy mechanisms that appropriately restrict access to information and reduce regrets. Finally, gamification elements applied to social networks and users’ privacy showed a positive effect on the users’ behavior towards privacy and safe practices in social networks.[ES] En la actualidad, las redes sociales se han convertido en un fenómeno cultural dominante para millones de usuarios de Internet. Las redes sociales son un entorno ideal para la generación de todo tipo de beneficios sociales para los usuarios. Los usuarios comparten experiencias, mantienen el contacto con sus familiares, amigos y conocidos, y obtienen beneficios económicos gracias al poder de su influencia (lo que se traduce en nuevas oportunidades de trabajo). Sin embargo, el uso de las redes sociales y la acción de compartir información implica la perdida de la privacidad de los usuarios. Recientemente ha emergido un gran interés en proteger la privacidad de los usuarios. Esta situación se ha debido a los casos de arrepentimientos documentados en las acciones de los usuarios, escándalos empresariales producidos por usos indebidos de la información personal, y a los sesgos que introducen los mecanismos de privacidad. Los proveedores de redes sociales han incluido mejoras en sus sistemas para reducir los riesgos en privacidad de los usuarios; por ejemplo, restringiendo las políticas de privacidad por defecto, añadiendo nuevos elementos de configuración de la privacidad, y diseñando accesos fáciles y directos para configurar la privacidad de los usuarios. En el campo de la investigación de la privacidad, nuevos avances se proponen para mejorar los mecanismos de privacidad la mayoría centrados en la automatización, selección de grano fino, y uso de características extraídas de la información y sus interacciones para recomendar la mejor política de privacidad para el usuario. A pesar de estos avances, muchos estudios han demostrado que la preocupación de los usuarios por la privacidad no se corresponde con las decisiones que finalmente toman en las redes sociales. Este desajuste en el comportamiento de los usuarios podría deberse a la complejidad del propio concepto de privacidad. Este inconveniente hace que los usuarios ignoren los riesgos de privacidad, o los perciban como temporalmente distantes. Otra causa del desajuste en el comportamiento de los usuarios podría deberse a la complejidad del proceso de toma de decisiones sobre la privacidad. Esto se debe a que los usuarios deben considerar todos los escenarios posibles y los factores involucrados (por ejemplo, el número de amigos, el tipo de relación, el contexto de la información, etc.) para tomar una decisión apropiada sobre la privacidad. Las principales contribuciones de esta tesis son el desarrollo de métricas para evaluar los riesgos de privacidad, y la propuesta de mecanismos de privacidad explicables (haciendo uso de las métricas desarrolladas) para asistir y concienciar a los usuarios durante el proceso de decisión sobre la privacidad. Atendiendo a la definición del concepto de la privacidad, las dimensiones del alcance de la información y la sensibilidad de la información se han considerado en esta tesis para evaluar los riesgos de privacidad. En cuanto a los mecanismos de privacidad explicables, se han diseñado utilizando técnicas de paternalismo blando y elementos de gamificación que hacen uso de las métricas propuestas. Estos mecanismos se han integrado en la red social PESEDIA y evaluado en experimentos con usuarios reales. PESEDIA es una red social desarrollada en el marco de la tesina de Master del doctorando [15], esta tesis y los proyectos nacionales “Privacidad en Entornos Sociales Educativos durante la Infancia y la Adolescencia” (TIN2014-55206-R) y “Agentes inteligentes para asesorar en privacidad en redes sociales” (TIN2017-89156-R). Los resultados confirman la validez de las métricas propuestas para calcular el alcance de los usuarios y la sensibilidad de las publicaciones de las redes sociales. En cuanto a la métrica del alcance, los resultados también mostraron la posibilidad de estimarla mediante métricas de centralidad local y social para escenarios con acceso limitado a la información. En cuanto a la métrica de sensibilidad, los resultados también pusieron de manifiesto la falta de concordancia de los usuarios en el caso de algunos tipos de información y el consenso en el caso de la mayoría de ellos. El uso de estas métricas como parte de los mensajes sobre las posibles consecuencias de las opciones de política de privacidad y las acciones de intercambio de información a los usuarios mostró efectos positivos en el comportamiento de los usuarios con respecto a la privacidad. Además, los resultados de la exploración de la compensación de los usuarios entre los costos y los beneficios durante las acciones de divulgación de información personal mostraron relaciones significativas con los círculos sociales habituales (familiares, amigos, compañeros de trabajo y usuarios desconocidos) y sus propiedades. Esto permitió diseñar mejores mecanismos de privacidad que restringen adecuadamente el acceso a la información y reducen los arrepentimientos. Por último, los elementos de gamificación aplicados a las redes sociales y a la privacidad de los usuarios mostraron un efecto positivo en el comportamiento de los usuarios hacia la privacidad y las prácticas seguras en las redes sociales.[CA] En l’actualitat, les xarxes socials s’han convertit en un fenomen cultural dominant per a milions d’usuaris d’Internet. Les xarxes socials són un entorn ideal per a la generació de tota mena de beneficis socials per als usuaris. Els usuaris comparteixen experiències, mantenen el contacte amb els seus familiars, amics i coneguts, i obtenen beneficis econòmics gràcies al poder de la seva influència (el que es tradueix en noves oportunitats de treball). No obstant això, l’ús de les xarxes socials i l’acció de compartir informació implica la perduda de la privacitat dels usuaris. Recentment ha emergit un gran interès per protegir la privacitat dels usuaris. Aquesta situació s’ha degut als casos de penediments documentats en les accions dels usuaris, escàndols empresarials produïts per usos indeguts de la informació personal, i als caires que introdueixen els mecanismes de privacitat. Els proveïdors de xarxes socials han inclòs millores en els seus sistemes per a reduir els riscos en privacitat dels usuaris; per exemple, restringint les polítiques de privacitat per defecte, afegint nous elements de configuració de la privacitat, i dissenyant accessos fàcils i directes per a configurar la privacitat dels usuaris. En el camp de la recerca de la privacitat, nous avanços es proposen per a millorar els mecanismes de privacitat la majoria centrats en l’automatització, selecció de gra fi, i ús de característiques extretes de la informació i les seues interaccions per a recomanar la millor política de privacitat per a l’usuari. Malgrat aquests avanços, molts estudis han demostrat que la preocupació dels usuaris per la privacitat no es correspon amb les decisions que finalment prenen en les xarxes socials. Aquesta desalineació en el comportament dels usuaris podria deure’s a la complexitat del propi concepte de privacitat. Aquest inconvenient fa que els usuaris ignorin els riscos de privacitat, o els percebin com temporalment distants. Una altra causa de la desalineació en el comportament dels usuaris podria deure’s a la complexitat del procés de presa de decisions sobre la privacitat. Això es deu al fet que els usuaris han de considerar tots els escenaris possibles i els factors involucrats (per exemple, el nombre d’amics, el tipus de relació, el context de la informació, etc.) per a prendre una decisió apropiada sobre la privacitat. Les principals contribucions d’aquesta tesi són el desenvolupament de mètriques per a avaluar els riscos de privacitat, i la proposta de mecanismes de privacitat explicables (fent ús de les mètriques desenvolupades) per a assistir i conscienciar als usuaris durant el procés de decisió sobre la privacitat. Atesa la definició del concepte de la privacitat, les dimensions de l’abast de la informació i la sensibilitat de la informació s’han considerat en aquesta tesi per a avaluar els riscos de privacitat. Respecte als mecanismes de privacitat explicables, aquests s’han dissenyat utilitzant tècniques de paternalisme bla i elements de gamificació que fan ús de les mètriques propostes. Aquests mecanismes s’han integrat en la xarxa social PESEDIA i avaluat en experiments amb usuaris reals. PESEDIA és una xarxa social desenvolupada en el marc de la tesina de Màster del doctorant [15], aquesta tesi i els projectes nacionals “Privacitat en Entorns Socials Educatius durant la Infància i l’Adolescència” (TIN2014-55206-R) i “Agents Intel·ligents per a assessorar en Privacitat en xarxes socials” (TIN2017-89156-R). Els resultats confirmen la validesa de les mètriques propostes per a calcular l’abast de les accions dels usuaris i la sensibilitat de les publicacions de les xarxes socials. Respecte a la mètrica de l’abast, els resultats també van mostrar la possibilitat d’estimarla mitjançant mètriques de centralitat local i social per a escenaris amb accés limitat a la informació. Respecte a la mètrica de sensibilitat, els resultats també van posar de manifest la falta de concordança dels usuaris en el cas d’alguns tipus d’informació i el consens en el cas de la majoria d’ells. L’ús d’aquestes mètriques com a part dels missatges sobre les possibles conseqüències de les opcions de política de privacitat i les accions d’intercanvi d’informació als usuaris va mostrar efectes positius en el comportament dels usuaris respecte a la privacitat. A més, els resultats de l’exploració de la compensació dels usuaris entre els costos i els beneficis durant les accions de divulgació d’informació personal van mostrar relacions significatives amb els cercles socials habituals (familiars, amics, companys de treball i usuaris desconeguts) i les seves propietats. Això ha permés dissenyar millors mecanismes de privacitat que restringeixen adequadament l’accés a la informació i redueixen els penediments. Finalment, els elements de gamificació aplicats a les xarxes socials i a la privacitat dels usuaris van mostrar un efecte positiu en el comportament dels usuaris cap a la privacitat i les pràctiques segures en les xarxes socials.Alemany Bordera, J. (2020). Measures of Privacy Protection on Social Environments [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/151456TESISCompendi

    Differences in Parental Expectations and Interactions of African American Mothers with a History of Substance Dependence

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    Substance dependency can affect a mother‘s health and her ability to parent. A cross sectional study was implemented to better understand resources of African American mothers in recovery from substance dependence. A convenience sample of 38 African American mothers at two drug treatment centers in Atlanta, Georgia completed the Michigan Screening Profile of Parents (Helfer, Hoffmeister, & Schneider, 1978). Results indicated that women who perceived that their emotional needs were being met were less likely to use maladaptive coping skills. Mothers who used less maladaptive coping skills were less likely to report negative interactions with their children. Results have implications for the needs of African Americans mothers in substance abuse treatment. Follow up studies may benefit from the use of longitudinal and qualitative research methods in order to comprehensively explain the impact of lifetime social supports on maladaptive coping and negative parenting behaviors for African American mothers in recovery

    Substance Misuse Transitions Between Adolescence and Young Adulthood: Impacts on Young Adult Self-Sufficiency

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    Substance misuse during the transition to adulthood can be problematic, but it is also socially celebrated. There can be negative short-term impacts associated with intoxication, but are there negative long-term impacts of substance misuse on the transition into adulthood? Let us pause for a moment. Many individuals may have just glazed over thinking, “Adulthood? I’m not doing that any time soon.” But when you consider what qualifies individuals as adults, this research may seem more pertinent. Adults make their own choices. Adults take responsibility for those choices. Adults are financially independent. So, while the notion of adulthood may conjure images of the suburbs and stability, adulthood as actually the ability to be self-sufficient. Something we are all working towards. This research looked at the young adult self-sufficiency outcomes between individuals who have patterns of substance misuse as they transition to adulthood and those who had minimal misuse. Specifically, we considered individuals who Matured-Out of substance use and individuals who continued to use. Continuing users were further divided into Continuing-Cannabis or Continuing-Illicit patterns. For the most part, those who Matured-Out by young adulthood had similar developmental outcomes compared to those who did not misuse substances during the transition to adulthood. Those who continued to use cannabis or illicit substances into young adulthood, however, were less self-sufficient as young adults. These findings have important implications for policies that promote cannabis legalization. As cannabis becomes increasingly available, policymakers and community leaders should have an eye on providing the necessary supports to help young adults gain self-sufficiency regardless of legalization status

    The Influence of Friendship Networks on Adolescents' Health-Risk Behaviors: A Social Network Analysis

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    Friendships among adolescents can exert significant influence on behaviors that pose risk to their health. However, empirical evidence for friendships’ influence is mixed due to various factors. Among these factors, are the complex mechanisms underlying friendship development (such as compliance with norms and beliefs that are encouraged and accepted by friends), as well as the use of traditional analytical methods for measuring the dynamic and complex mechanisms underlying the connection between friendships among adolescents and risky behaviors. This dissertation addresses adolescents’ health risk behaviors and the influence of friendship network structures on their risky behaviors, using Social Network Analysis (SNA) as an analytic tool. The dissertation comprises two studies: The first one comprises a systematic literature review, focusing on studies of the influence of friendship networks on adolescents’ risky behaviors, which utilizes Social Network Analysis (SNA) and the Add Health data (a nationally representative sample). The review’s findings indicated that, across the studies assessed, having friends engaging in risky behaviors is a negative predictor of adolescents’ healthy behaviors. Moreover, the average methodological quality score (MQS) attributed to the reviewed studies was 4.5 (SD=1.4), an indicator of good quality (actual scores ranging from 2 to 7 points). In the second study, we described the structure of friendship networks for adolescents who engage in, and for those who do not engage in sexual intercourse and alcohol consumption simultaneously. We also assessed the influence of the network’s structure upon adolescents’ simultaneous sexual intercourse and alcohol consumption. Among the two schools examined in this study, out-degree and betweenness centrality functioned as significant predictors of increased engagement in sexual intercourse and drinking alcohol in tandem for School 1. Also for School 1, adolescents’ age was associated with an increased risk for involvement in these simultaneous behaviors. In School 2, engagement in risky behaviors (sexual intercourse and alcohol consumption simultaneously) was significantly predicted by teens’ age and gender, but there were no effects of network attributes on adolescents’ risky behaviors. Taken together, findings from these two studies contribute to better insights for developing intervention programs, especially programs targeting adolescents’ friendship networks. Additional research also is warranted to examine how peer influences impact behavior over time (longitudinal studies), and how multi-level characteristics (e.g., intrapersonal or interpersonal) might interact with network structure variables to affect adolescents’ risky health behaviors
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