Privacy Preservation by Disassociation

In this work, we focus on protection against identity disclosure in the publication of sparse multidimensional data. Existing multidimensional anonymization techniquesa) protect the privacy of users either by altering the set of quasi-identifiers of the original data (e.g., by generalization or suppression) or by adding noise (e.g., using differential privacy) and/or (b) assume a clear distinction between sensitive and non-sensitive information and sever the possible linkage. In many real world applications the above techniques are not applicable. For instance, consider web search query logs. Suppressing or generalizing anonymization methods would remove the most valuable information in the dataset: the original query terms. Additionally, web search query logs contain millions of query terms which cannot be categorized as sensitive or non-sensitive since a term may be sensitive for a user and non-sensitive for another. Motivated by this observation, we propose an anonymization technique termed disassociation that preserves the original terms but hides the fact that two or more different terms appear in the same record. We protect the users' privacy by disassociating record terms that participate in identifying combinations. This way the adversary cannot associate with high probability a record with a rare combination of terms. To the best of our knowledge, our proposal is the first to employ such a technique to provide protection against identity disclosure. We propose an anonymization algorithm based on our approach and evaluate its performance on real and synthetic datasets, comparing it against other state-of-the-art methods based on generalization and differential privacy.Comment: VLDB201

Health and the natural environment: A review of evidence, policy, practice and opportunities for the future

This is the final version. Available from defra via the link in this record.This report details the outcomes of the Natural Environment and Health Fellowship, a partnership between Defra and the University of Exeter Medical School’s (UEMS) European Centre for Environment and Human Health (ECEHH). The work focused on the interconnections between the natural environment and good health (it does not consider environmental risks or stressors), and the ways in which these are, or could be harnessed in policy and practice. The majority of the work was undertaken in 2015-2016, prior to a number of significant developments such as the EU referendum and the publication of the 25 Year Plan to Improve the Environment. The research informed development of the 25 Year Plan and can inform the delivery of both the health themes of the 25 Year Plan and the development of environmental policy after leaving the European Union.Department for Environment, Food and Rural Affairs (DEFRA

Conviviality by design : the socio-spatial qualities of spaces of intercultural urban encounters

This paper presents findings from a mixed-method research project which explored use of outdoor spaces and social connections in Bradford, a post-industrial city in the north of England with a highly ethnically diverse population. Data was collected through micro-scale behavioural mapping of public spaces (analysed using GIS) and both on-site and in-depth interviews. The integration of these methods allows a focus on intersectional identities and social values for everyday conviviality situated in different typologies of public open spaces (parks, squares, streets) in city centre and suburban neighbourhoods. The analysis offers nuanced insights into the socio-spatial aspects of conviviality: patterns of activity by diverse users, situations in which encounters are prompted, and the implications of negotiating differences in relation to perceptions of self, others, and the environment. We discuss the relevance of the urban public realm for shared understandings of diversity, qualities of visibility, lingering and playfulness, and the importance of threshold spaces. We explore racialised and excluding experiences and how these relate to mobility and territorial patterns of use, specifically with relation to gender. The paper highlights connections between intercultural encounters and urban design practice, with implications for well-being and integration in ethnically diverse urban areas

Sex trafficking in Nepal: A qualitative study of process and context. Abstract.

Thousands of Nepalese girls are trafficked to India and other neighbouring countries every year, primarily for sex work and the majority return to Nepal after spending a years in sex trade. The sub‐group of Nepalese girls who become involved in sex work via trafficking are the focus of this paper. The aim of this study was to increase understanding regarding the context of sex trafficking, the methods and means of trafficking, living conditions in brothels and survival strategies among trafficked girls. We conducted 33 in‐depth interviews in early 2013 with returned trafficking survivors (n=14) and policy‐makers, people working in trafficking related NGOs/INGOs (n=19) in Nepal. All 14 trafficking survivors were recruited in Nepal through the NGO working on trafficking field. The young girls trafficked from Nepal to India in this study were typically unmarried, illiterate and very young (8 to 14 years at the time of trafficking). The key methods of trafficking were false marriage, fake job offer, and abduction. Among the 14 respondents, some had spent one month and others nearly 5 years in Indian brothels. Respondents were either rescued, escaped or released by brothel owners. Four out of 14 were HIV positive. Most policy makers mentioned that poverty, unemployment and illiteracy are the causes behind the trafficking of young girls. The anti‐trafficking interventions need to be considered at a) community level before movement has begun; b) urban centres which are both source and transitory centres for trafficking; c) trafficking level when girls are highly mobile and when they are in brothels; and d) return from trafficking as girls to m ove back into the community