Urban Mobility Transitions: Governing through Experimentation in Bristol and New York City

Transitions away from car-dominance is one of the key debates in urban research, policy and practice today. Car-free public space, cycling and convenient public transport services are widely seen as desirable, yet the reconfiguration of our streets and transport networks has been incremental. This doctoral research examines how mobility in cities is governed through experiments, commonly understood as pilot projects, and whether experiments hold potential for transformative change in urban mobility systems, including transitions away from automobility. The research draws on a synthesis of sustainability transitions, transport studies and urban studies literature, and traces the outcomes of 108 experiments undertaken over two decades in two cities: Bristol (UK) and New York City (USA) between 1996/7 and 2016. The findings demonstrate that experiments can contribute to transforming the physical shape of urban mobility systems and the institutions involved in governing them, and can even contribute to transitions, if assessed as change in commuting patterns away from car use. The research compares the capacity of respective municipal governments, Bristol City Council and NYC city government for ‘transformative experimentation’, and presents an institutionalist analysis of why the transformation of Bristol’s mobility system was more limited than NYC’s. To unpack the problematisation of piecemeal, ‘project-based’ experimentation driven by competitive funding landscapes, the research compares Bristol City Council and NYC city government as two municipalities with a different degree of reliance on external funding. The stronger capacity of NYC city government can be explained by its higher degree of fiscal autonomy and mobility policy discretion, whereas Bristol City Council’s capacity was limited by the centralisation of the UK state. Yet the thesis also shows that both municipalities pursued successful endogenous strategies in response to multi-scalar structure, and points to organisational and governance practices that can create ‘political space’ for urban actors to further transitions

Incentive-driven QoS in peer-to-peer overlays

A well known problem in peer-to-peer overlays is that no single entity has control over the software, hardware and configuration of peers. Thus, each peer can selfishly adapt its behaviour to maximise its benefit from the overlay. This thesis is concerned with the modelling and design of incentive mechanisms for QoS-overlays: resource allocation protocols that provide strategic peers with participation incentives, while at the same time optimising the performance of the peer-to-peer distribution overlay. The contributions of this thesis are as follows. First, we present PledgeRoute, a novel contribution accounting system that can be used, along with a set of reciprocity policies, as an incentive mechanism to encourage peers to contribute resources even when users are not actively consuming overlay services. This mechanism uses a decentralised credit network, is resilient to sybil attacks, and allows peers to achieve time and space deferred contribution reciprocity. Then, we present a novel, QoS-aware resource allocation model based on Vickrey auctions that uses PledgeRoute as a substrate. It acts as an incentive mechanism by providing efficient overlay construction, while at the same time allocating increasing service quality to those peers that contribute more to the network. The model is then applied to lagsensitive chunk swarming, and some of its properties are explored for different peer delay distributions. When considering QoS overlays deployed over the best-effort Internet, the quality received by a client cannot be adjudicated completely to either its serving peer or the intervening network between them. By drawing parallels between this situation and well-known hidden action situations in microeconomics, we propose a novel scheme to ensure adherence to advertised QoS levels. We then apply it to delay-sensitive chunk distribution overlays and present the optimal contract payments required, along with a method for QoS contract enforcement through reciprocative strategies. We also present a probabilistic model for application-layer delay as a function of the prevailing network conditions. Finally, we address the incentives of managed overlays, and the prediction of their behaviour. We propose two novel models of multihoming managed overlay incentives in which overlays can freely allocate their traffic flows between different ISPs. One is obtained by optimising an overlay utility function with desired properties, while the other is designed for data-driven least-squares fitting of the cross elasticity of demand. This last model is then used to solve for ISP profit maximisation

Stories to Challenge the Status Quo - Experiences of Black Minority Ethnic Social Care Students in Ireland

This study examines Black Minority Ethnic social care students’ experiences in Ireland and is located within the parameters of a number of key global events that occurred in the last decade. It provides critical insights into the students lived experiences of migration, resettlement, employment, higher education and social care scholarship. Theoretically the thesis is grounded in Critical Race Theory (CRT) drawing on the key tenets of race as a social construction, interest convergence, White privilege, storytelling and intersectionality. A participatory research methodology was adopted which informed all phases of the study. Using a combined semi-structured interview/storytelling method the experiences of 21 female Black Minority Ethnic social care students in five colleges in Ireland were explored and core themes of loss, fear, distrust and adaptions were identified. By hearing, amplifying and sharing the experiences and voices of these participants, the research highlights the intersectional and cumulative impact of structural, institutional, systemic and personal racism and oppression in Ireland. The discussion considers the core themes of loss, fear and distrust and assesses the implications for Black Minority Ethnic social care students living, working and studying in Ireland. The lessons learned provide the basis for recommendations targeted at wider society, higher education and social care scholarship and signpost considerations for future research. A key action stemming from the study is the development of the Race Equity Informed Common Space community of practice currently piloted in TU Dublin. This action, based on collaboration and participation, will advance some of the lessons learned from the research

Signaling and Reciprocity:Robust Decentralized Information Flows in Social, Communication, and Computer Networks

Complex networks exist for a number of purposes. The neural, metabolic and food networks ensure our survival, while the social, economic, transportation and communication networks allow us to prosper. Independently of the purposes and particularities of the physical embodiment of the networks, one of their fundamental functions is the delivery of information from one part of the network to another. Gossip and diseases diffuse in the social networks, electrochemical signals propagate in the neural networks and data packets travel in the Internet. Engineering networks for robust information flows is a challenging task. First, the mechanism through which the network forms and changes its topology needs to be defined. Second, within a given topology, the information must be routed to the appropriate recipients. Third, both the network formation and the routing mechanisms need to be robust against a wide spectrum of failures and adversaries. Fourth, the network formation, routing and failure recovery must operate under the resource constraints, either intrinsic or extrinsic to the network. Finally, the autonomously operating parts of the network must be incentivized to contribute their resources to facilitate the information flows. This thesis tackles the above challenges within the context of several types of networks: 1) peer-to-peer overlays – computers interconnected over the Internet to form an overlay in which participants provide various services to one another, 2) mobile ad-hoc networks – mobile nodes distributed in physical space communicating wirelessly with the goal of delivering data from one part of the network to another, 3) file-sharing networks – networks whose participants interconnect over the Internet to exchange files, 4) social networks – humans disseminating and consuming information through the network of social relationships. The thesis makes several contributions. Firstly, we propose a general algorithm, which given a set of nodes embedded in an arbitrary metric space, interconnects them into a network that efficiently routes information. We apply the algorithm to the peer-to-peer overlays and experimentally demonstrate its high performance, scalability as well as resilience to continuous peer arrivals and departures. We then shift our focus to the problem of the reliability of routing in the peer-to-peer overlays. Each overlay peer has limited resources and when they are exhausted this ultimately leads to delayed or lost overlay messages. All the solutions addressing this problem rely on message redundancy, which significantly increases the resource costs of fault-tolerance. We propose a bandwidth-efficient single-path Forward Feedback Protocol (FFP) for overlay message routing in which successfully delivered messages are followed by a feedback signal to reinforce the routing paths. Internet testbed evaluation shows that FFP uses 2-5 times less network bandwidth than the existing protocols relying on message redundancy, while achieving comparable fault-tolerance levels under a variety of failure scenarios. While the Forward Feedback Protocol is robust to message loss and delays, it is vulnerable to malicious message injection. We address this and other security problems by proposing Castor, a variant of FFP for mobile ad-hoc networks (MANETs). In Castor, we use the same general mechanism as in FFP; each time a message is routed, the routing path is either enforced or weakened by the feedback signal depending on whether the routing succeeded or not. However, unlike FFP, Castor employs cryptographic mechanisms for ensuring the integrity and authenticity of the messages. We compare Castor to four other MANET routing protocols. Despite Castor's simplicity, it achieves up to 40% higher packet delivery rates than the other protocols and recovers at least twice as fast as the other protocols in a wide range of attacks and failure scenarios. Both of our protocols, FFP and Castor, rely on simple signaling to improve the routing robustness in peer-to-peer and mobile ad-hoc networks. Given the success of the signaling mechanism in shaping the information flows in these two types of networks, we examine if signaling plays a similar crucial role in the on-line social networks. We characterize the propagation of URLs in the social network of Twitter. The data analysis uncovers several statistical regularities in the user activity, the social graph, the structure of the URL cascades as well as the communication and signaling dynamics. Based on these results, we propose a propagation model that accurately predicts which users are likely to mention which URLs. We outline a number of applications where the social network information flow modelling would be crucial: content ranking and filtering, viral marketing and spam detection. Finally, we consider the problem of freeriding in peer-to-peer file-sharing applications, when users can download data from others, but never reciprocate by uploading. To address the problem, we propose a variant of the BitTorrent system in which two peers are only allowed to connect if their owners know one another in the real world. When the users know which other users their BitTorrent client connects to, they are more likely to cooperate. The social network becomes the content distribution network and the freeriding problem is solved by leveraging the social norms and reciprocity to stabilize cooperation rather than relying on technological means. Our extensive simulation shows that the social network topology is an efficient and scalable content distribution medium, while at the same time provides robustness to freeriding

In the Shape of a Paisley: An Autoethnography Study of the Gap in Iranian Immigrant Women With Government Executive Leadership Roles

This study explored the experiences of Iranian immigrant women leaders in the government sector in the Pacific Northwest. The focus of the study was to understand how their experiences of inequitable opportunities in the workplace prohibited them from attaining and advancing executive leadership roles. A qualitative autoethnography approach was used to explore how the researcher’s lived experiences denoted the career pathway trajectory for Iranian immigrant women in the government sector to capture the essence of their experiences navigating inequities along the leadership pipeline. To examine their experiences, multiracial feminism theory and representative bureaucracy theory provided a multifaceted viewpoint of Iranian immigrant women in the context of their identities concerning their leadership roles. A conceptual framework also guided this study through the lens of the “emotional tax” phenomenon on women of color in the workplace as they identified inequities in the organizations in which they worked. Finally, this study drew exclusively from the researcher’s experience, who served in a leadership position in the government sector. Through the development of supporting concepts and subthemes, four major themes emerged, including (a) Cultural Influence, (b) Powerless, (c) Empowered, and (d) Servant Leadership. These themes explained the process of leader emergence within the Iranian immigrant women community

Mediatization, Marketization and Non-profits: A Comparative Case Study of Community Foundations in the UK and Germany

PhD ThesisOver the past decades, media actors and technologies have profoundly transformed how organisations and institutions communicate with citizens and vice versa. Drawing on mediatization theory, the thesis explores the contours and context of communication by non-profit organisations, focusing on community foundations in the UK and Germany. The aim of the work is to provide a deeper understanding of the strategies, motivations and patterns of communication which have been adopted in these organisations which now exist within a highly networked and mediatised society, and the ways in which those strategies have kept pace with technological change. I make an original contribution to the concept of mediatization by applying it to the non-profit sector, using a comparative case study approach. I also make an original contribution to our understanding of how non-profits plan their communication strategies in a contemporary environment of information overload and economic austerity. Drawing on interviews with communication professionals and marketing managers in a range of community foundations in the UK and Germany, the study explores how activities such as building relationships, strategic planning and positioning, fundraising, attracting volunteers and interacting with stakeholders, including potential donors, are influenced by processes of mediatization and marketization. In addition to the interviews, a content analysis of these organisations’ websites has been undertaken to better understand their adoption and use of digital communication tools to maximise their effectiveness online. Through a careful and in-depth analysis of how processes of mediatization, marketization and professionalisation affect these non-profits, the study provides a timely assessment of both drivers and resistors in adopting and adapting to social and technological change within this particular sector

The Public Value of the Humanities

This book is available as open access through the Bloomsbury Open Access programme and is available on www.bloomsburycollections.com. Recession is a time for asking fundamental questions about value. At a time when governments are being forced to make swingeing savings in public expenditure, why should they continue to invest public money funding research into ancient Greek tragedy, literary value, philosophical conundrums or the aesthetics of design? Does such research deliver 'value for money' and 'public benefit'? Such questions have become especially pertinent in the UK in recent years, in the context of the drive by government to instrumentalize research across the disciplines and the prominence of discussions about ‘economic impact' and 'knowledge transfer'. In this book a group of distinguished humanities researchers, all working in Britain, but publishing research of international importance, reflect on the public value of their discipline, using particular research projects as case-studies. Their essays are passionate, sometimes polemical, often witty and consistently thought-provoking, covering a range of humanities disciplines from theology to architecture and from media studies to anthropology