767,026 research outputs found

    Trust-Based Community Assessment

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    In this paper we present Community Assessment (COMAS), a trust-based assessment service that helps compute group opinion from the perspective of a specific community member. We apply COMAS in the context of communities of learners, and we compute the group opinion from the perspective of the teacher. Specifically, our model relies on \emph{teacher assessments}, aggregations of \emph{student assessments} and \emph{trust measures} derived from student assessments to suggest marks to assignments that have not been assessed by the teacher. The proposed model intends to support intelligent online learning applications by 1) encouraging students to assess one another, and 2) benefiting from students' assessments. We believe the task of assessing massive numbers of students is of special interest to online learning communities, such as Massive Open Online Courses (MOOCs). Experimental results were conducted on a real classroom datasets as well as simulated data that considers different social network topologies (where we say students assess some assignments of socially connected students). Results show that our method 1) is sound, i.e. the error of the suggested assessments decreases for increasing numbers of teacher assessments; and 2) scales for large numbers of students. 2015 Elsevier Ltd. All rights reservedThis work is supported by the CollectiveMind project (Spanish Ministry of Economy and Competitiveness, under grant number TEC2013-49430-EXP), the MILESS project (Spanish Ministry of Economy and Competitiveness, under grant num- ber TIN2013-45039-P) and the PRAISE project (funded by the European Commission, under grant number 388770)Peer reviewe

    Flow-based reputation with uncertainty: Evidence-Based Subjective Logic

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    The concept of reputation is widely used as a measure of trustworthiness based on ratings from members in a community. The adoption of reputation systems, however, relies on their ability to capture the actual trustworthiness of a target. Several reputation models for aggregating trust information have been proposed in the literature. The choice of model has an impact on the reliability of the aggregated trust information as well as on the procedure used to compute reputations. Two prominent models are flow-based reputation (e.g., EigenTrust, PageRank) and Subjective Logic based reputation. Flow-based models provide an automated method to aggregate trust information, but they are not able to express the level of uncertainty in the information. In contrast, Subjective Logic extends probabilistic models with an explicit notion of uncertainty, but the calculation of reputation depends on the structure of the trust network and often requires information to be discarded. These are severe drawbacks. In this work, we observe that the `opinion discounting' operation in Subjective Logic has a number of basic problems. We resolve these problems by providing a new discounting operator that describes the flow of evidence from one party to another. The adoption of our discounting rule results in a consistent Subjective Logic algebra that is entirely based on the handling of evidence. We show that the new algebra enables the construction of an automated reputation assessment procedure for arbitrary trust networks, where the calculation no longer depends on the structure of the network, and does not need to throw away any information. Thus, we obtain the best of both worlds: flow-based reputation and consistent handling of uncertainties

    Impact of social stigma on the process of obtaining informed consent for genetic research on podoconiosis: a qualitative study

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    Background The consent process for a genetic study is challenging when the research is conducted in a group stigmatized because of beliefs that the disease is familial. Podoconiosis, also known as 'mossy foot', is an example of such a disease. It is a condition resulting in swelling of the lower legs among people exposed to red clay soil. It is a very stigmatizing problem in endemic areas of Ethiopia because of the widely held opinion that the disease runs in families and is untreatable. The aim of this study was to explore the impact of social stigma on the process of obtaining consent for a study on the genetics of podoconiosis in Southern Ethiopia. Methods We adapted a rapid assessment tool validated in The Gambia. The methodology was qualitative involving focus-group discussions (n = 4) and in-depth interviews (n = 25) with community members, fieldworkers, researchers and staff of the Mossy Foot Treatment and Prevention Association (MFTPA) working on prevention and treatment of podoconiosis. Results We found that patients were afraid of participation in a genetic study for fear the study might aggravate stigmatization by publicizing the familial nature of the disease. The MFTPA was also concerned that discussion about the familial nature of podoconiosis would disappoint patients and would threaten the trust they have in the organization. In addition, participants of the rapid assessment stressed that the genetic study should be approved at family level before prospective participants are approached for consent. Based on this feedback, we developed and implemented a consent process involving community consensus and education of fieldworkers, community members and health workers. In addition, we utilized the experience and established trust of the MFTPA to diminish the perceived risk. Conclusion The study showed that the consent process developed based on issues highlighted in the rapid assessment facilitated recruitment of participants and increased their confidence that the genetic research would not fuel stigma. Therefore, investigators must seek to assess and address risks of research from prospective participants' perspectives. This involves understanding the issues in the society, the culture, community dialogues and developing a consent process that takes all these into consideration

    Con Confianza: Using Community-Based Participatory Research Principles to Inform Community-Academic Partnership Practices and Build Trust in Hispanic Communities

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    Hispanic communities are at disproportionate risk for chronic diseases and researchers have cited the need for further community and culturally informed studies to improve research outcomes to either make treatments and interventions more generalizable or modify them to the needs of Hispanic communities. However, many of the same linguistic and cultural barriers to health care access and utilization also impact the ability for Hispanic groups to participate in research studies. Community Academic Partnerships (CAPs) are positioned to conduct culturally and linguistically competent research in Hispanic communities. For research in Hispanic communities to be effective, CAPs must prioritize practices that build and maintain trust. This can be done by applying the most common and sustainable practices in successful CAPs informed by Community Based Participatory Research (CBPR) principles. These include establishing a role and definition of the community; including the community in the design process; ensuring ongoing knowledge transfer among academic leaders and community members of the community and the subject matter researched; and performing ongoing assessment of community engagement across the continuum of community engagement. These practices communicate commitment to Hispanic communities in CAPs and also provide academic researchers accountability measures ensure the partnership is reflective of the community needs. These practices also contribute to the building and maintenance of trust and a sustained partnership

    Addressing Health Disparities Among Homeless in Alachua County through Community-Based Participatory Research.

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    Introduction. In states such as Florida that did not expand Medicaid, a large number of economically disadvantaged individuals do not qualify for subsidies to buy health insurance through the Affordable Care Act (ACA) 2. This leaves the health needs of Florida’s homeless population largely unaddressed. Nearly 48.1% of Alachua County’s homeless population has disabling conditions 16. This confirms a pressing need to understand the homeless population\u27s healthcare needs, knowledge, and barriers in accessing healthcare. Methods. We used a Community-Based Participatory Research model in conducting health fairs and needs assessment surveys, incentivizing participation, and providing education about existing resources. The surveys were conducted at two homeless meal service sites and consisted of 22 questions regarding access to healthcare, utilization, and satisfaction. Health fairs consisted of blood pressure, blood glucose, and mental health screening. Patient participation was encouraged through games, prizes and food. Results. Of the population we surveyed, 100% have income levels below $11,490, therefore all uninsured fall into the ACA coverage gap. Those less than 65 years of age do not qualify for Medicare unless disabled. Some qualify for Medicaid as shown in tables. Fifty-eight percent were uninsured and did not get any treatment for their illnesses. Additionally, 67% had no knowledge of free local healthcare clinics. Discussion/Conclusion. The majority of this population falls into the ACA Coverage Gap, lacks knowledge about free community clinics, and inappropriately uses the ED. Future implications of this research involve advocacy to expand Medicaid in Florida and enroll those who are eligible for health insurance. Vital goals include outreach by free healthcare clinics to make healthcare more accessible, as well as building trust with the community through continued outreach initiatives. A community-Based Participatory Research Model is an effective tool to increasing collaboration among diverse members of the community in order to bring meaningful and positive change to the health of populations

    Jockey Club Age-Friendly City Project : Action plan : Islands

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    In response to the global ageing population, the World Health Organization (the “WHO”) devised the concept of “Global Age-friendly Cities” in 2005 to encourage cities all around the world to develop a healthy and comfortable living environment with age-friendly facilities and provide sufficient community support and health care services which benefit the older people, family and society. In order to proactively tackle the challenges of an ageing population and promote the concept of an age-friendly city, the Hong Kong Jockey Club Charities Trust launched the Jockey Club Age-friendly City Project (“Project”) in 2015 in partnership with four gerontology research institutes of local universities, including CUHK Jockey Club Institute of Ageing, Sau Po Centre on Ageing of the University of Hong Kong, Asia-Pacific Institute of Ageing Studies of Lingnan University (“LU APIAS”), and Institute of Active Ageing of the Hong Kong Polytechnic University. The four institutes have formed professional teams under this project to support eighteen districts in Hong Kong to adopt a bottom-up and district-based approach to develop age-friendly communities. Under the Project, LU APIAS conducted a baseline assessment, which comprised questionnaire surveys, focus group interviews and field observation from July 2015 to February 2016 in order to provide relevant information to the Islands District Council and other district stakeholders on the existing age-friendliness of the Islands District, Hong Kong (“District”). Senior residents in the District have also been recruited as ambassadors to spread the messages of age-friendly city. Training workshops and seminars have been arranged to equip them with necessary skills and knowledge to perform qualitative research by making assessment in the District with reference to the eight domains of the “Age-friendly City”. Meanwhile, the residents are encouraged to express their views regarding age-friendly facilities and measures in the community. LU APIAS has compiled the results of baseline assessment, including questionnaire surveys, focus groups and observations by the ambassadors, into a baseline assessment report. The report, together with this action plan for improving the age-friendliness of the District, will be submitted to WHO for joining its Global Network of Age-friendly Cities and Communities

    Tailoring consent to context: designing an appropriate consent process for a biomedical study in a low income setting

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    Background Currently there is increasing recognition of the need for research in developing countries where disease burden is high. Understanding the role of local factors is important for undertaking ethical research in developing countries. We explored factors relating to information and communication during the process of informed consent, and the approach that should be followed for gaining consent. The study was conducted prior to a family-based genetic study among people with podoconiosis (non-filarial elephantiasis) in southern Ethiopia. Methodology/Principal Findings We adapted a method of rapid assessment validated in The Gambia. The methodology was entirely qualitative, involving focus-group discussions and in-depth interviews. Discussions were conducted with podoconiosis patients and non-patients in the community, fieldworkers, researchers, staff of the local non-governmental organisation (NGO) working on prevention and treatment of podoconiosis, and community leaders. We found that the extent of use of everyday language, the degree to which expectations of potential participants were addressed, and the techniques of presentation of information had considerable impact on comprehension of information provided about research. Approaching podoconiosis patients via locally trusted individuals and preceding individual consent with community sensitization were considered the optimal means of communication. Prevailing poverty among podoconiosis patients, the absence of alternative treatment facilities, and participants' trust in the local NGO were identified as potential barriers for obtaining genuine informed consent. Conclusions Researchers should evaluate the effectiveness of consent processes in providing appropriate information in a comprehensible manner and in supporting voluntary decision-making on a study-by-study basis

    Jockey Club Age-Friendly City Project : Action plan : Tuen Mun

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    In response to the global ageing population, the World Health Organization (the “WHO”) devised the concept of “Global Age-friendly Cities” in 2005 to encourage cities all around the world to develop a healthy and comfortable living environment with age-friendly facilities and provide sufficient community support and health care services which benefit the older people, family and society. In order to proactively tackle the challenges of an ageing population and promote the concept of an age-friendly city, the Hong Kong Jockey Club Charities Trust launched the Jockey Club Age-friendly City Project (“Project”) in 2015 in partnership with four gerontology research institutes of local universities, including CUHK Jockey Club Institute of Ageing, Sau Po Centre on Ageing of the University of Hong Kong, Asia-Pacific Institute of Ageing Studies of Lingnan University (“LU APIAS”), and Institute of Active Ageing of the Hong Kong Polytechnic University. The four institutes have formed professional teams under this project to support eighteen districts in Hong Kong to adopt a bottom-up and district-based approach to develop age-friendly communities. Under the Project, LU APIAS conducted a baseline assessment, which comprised questionnaire surveys, focus group interviews and field observation from May to September 2017 in order to provide relevant information to the Tuen Mun District Council and other district stakeholders on the existing age-friendliness of Tuen Mun District, Hong Kong (“District”). Senior residents in the District have also been recruited as ambassadors to spread the messages of age-friendly city. Training workshops and seminars have been arranged to equip them with necessary skills and knowledge to perform qualitative research by making assessment in the District with reference to the eight domains of the “Age-friendly City”. Meanwhile, residents have been encouraged to express their views regarding age-friendly facilities and measures in the community. LU APIAS has compiled the results of baseline assessment, including questionnaire surveys, focus groups and observations by the ambassadors, into a baseline assessment report. The report, together with this action plan for enhancing the age-friendliness of the District, will be submitted to WHO for joining its Global Network of Age-friendly Cities and Communities

    Multi-Country Study on Trusted Partners among Youth: Eritrea, Tanzania, Zambia, and Zimbabwe

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    ObjectivesExplore youth's definitions of "trust"Establish criteria youth use to determine the trustworthiness of partnersIdentify types of individuals youth believe they can and cannot "trust"Examine trust's influence on sexual decision-making and STI/HIV risk perceptionIdentify how sexual partners violate trust and the effects on sexual decision-makingStudy designData were collected in October 2001 as part of a regional Behavior Change Communication (BCC) strategy in East and Southern Africa. Country programs chose to participate in research based on project priorities and levels of interest in participating in a regional BCC strategy. Four county programs agreed to collect and share data, Eritrea, Tanzania, Zambia, and Zimbabwe.A total of 33 focus groups were conducted. Research teams in each country used the same discussion guide and pretested the guide prior to data collection. Discussion groups lasted between an hour and an hour and a half, were audiotaped, and transcribed into English. Each research team conducted two discussion groups in the major urban area composed of the following strata: males 15-19 years, females 15-19 years, males 20-24 years, and females 20-24 years. The Zambia program conducted one additional focus group with males aged 15-19.FindingsExplore youth's definition of "trust" and criteria used to determine trustworthinessThe major components of trust did not vary greatly across countries. Youth in all countries placed a high value on sexual fidelity and its role in trusted partnerships. Youth believed that partners met through family or friends are more trustworthy than those met in bars or nightclubs. In addition, youth in all countries expressed that trusted partners must pass informal assessments, dress appropriately, demonstrate appropriate social conduct, talk sweetly to each other, come from the right neighborhood, meet one another's family, be punctual for appointments/dates, and remain emotionally committed to one another. Eritrean youth appeared to place greater importance on the roles that religion, virginity, and marriage (or intent to marry) play in establishing trust than youth from other countries.Differences in criteria for trust were more apparent by gender. In terms of testing partners' trustworthiness, females discussed passive ways of questioning partners, while males discussed elaborate methods for entrapping females in lies. Males were concerned with partners' sexual reputation and appearance. Females were primarily concerned with partners' emotional commitment, willingness to accept responsibility for pregnancies, and ability to display affection in public in order to demonstrate intimacy and trust.Identify types of individuals youth believe they can and cannot "trust"Across countries, youth place prospective partners into groups that can and cannot be trusted according to key attributes and behaviors. Similar to the findings above, most participants said that youth that come from good families, are well respected in the community, are religious, do not drink, avoid bars and nightclubs, and are faithful can be trusted. Youth believe that they cannot trust anyone outside of committed, monogamous relationships. Male participants added that virgins can be trusted.Examine trust's influence on sexual decision-making and STI/HIV risk perceptionYouth do not appear to take effective preventive measures with trusted partners. Trust can blind them to their risk for STIs/HIV and render them unwilling to explore partners' sexual histories. Sex usually occurs early in relationships and condom use remains low. When youth use condoms, they are more likely to incorporate them into casual than trusted relationships, or use them for pregnancy prevention rather than protection from STIs/HIV. Condoms are usually abandoned once relationships appear to be serious and partners fail to show signs or symptoms of STIs or HIV infection. There were few differences in risk perception and risk behavior across countries; however, male participants in Zambia reported that they discuss their sexual histories, while participants from other countries said that couples rarely discuss their sexual histories.Identify how sexual partners violate trust and the effects on sexual decision-makingInfidelity represents the most serious violation of trust and usually results in the end of relationships. A common theme across all countries was youth's refusal to learn from past experiences and apply them to future sexual decision-making. Even when trust is broken, youth fail to apply lessons learned to new relationships, repeating the same scenarios of trust, infidelity and exposure to STIs/HIV.Programmatic implicationsYouth must understand that partners' trustworthiness and character are independent of their risk for STIs/HIV. Although a checklist may help youth select a good partner, unprotected sex with this or any other person must be perceived as risky. Youth must also personalize their risk for STIs/HIV and avoid thinking that only people outside of their community are at risk for infection. It is likely that interpersonal communication campaigns or other community-level activities will help achieve an improved risk perception. Finally, in order to communicate new and appropriate levels of personal risk assessment, programs should strive to achieve broad social support, if not pressure for, consistent condom use, knowledge of one's own HIV status as well as that of all partners, and delay of sexual activity where possible
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