24 results on '"Frances Brazier"'
Search Results
2. Stoichiometric model of a fully closed bioregenerative life support system for autonomous long-duration space missions
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Angelo C. J. Vermeulen, Alvaro Papic, Igor Nikolic, and Frances Brazier
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space exploration ,human spaceflight ,bioregenerative life support ,waste processing ,food production ,ecosystem modeling ,Astronomy ,QB1-991 ,Geophysics. Cosmic physics ,QC801-809 - Abstract
Bioregenerative life support systems (BLSS) are vital for long-duration and remote space missions to increase mission sustainability. These systems break down human waste materials into nutrients and CO2 for plants and other edible organisms, which in turn provide food, fresh water, and oxygen for astronauts. The central idea is to create a materially closed loop, which can significantly reduce mission mass and volume by cutting down or even eliminating disposable waste. In most BLSS studies only a fraction of the resources, such as food, are provided by the system itself, with the rest taken on board at departure or provided through resupply missions. However, for autonomous long-duration space missions without any possibility of resupply, a BLSS that generates all resources with minimal or no material loss, is essential. The goal of this study is to develop a stoichiometric model of a conceptually fully closed BLSS that provides all the metabolic needs of the crew and organisms. The MELiSSA concept of the European Space Agency is used as reference system, consisting of five interconnected compartments, each inhabited by different types of organisms. A detailed review of publicly available MELiSSA literature from 1989 to 2022 revealed that no existing stoichiometric model met the study’s requirements. Therefore, a new stoichiometric model was developed to describe the cycling of the elements C, H, O, and N through all five MELiSSA compartments and one auxiliary compartment. A compact set of chemical equations with fixed coefficients was established for this purpose. A spreadsheet model simulates the flow of all relevant compounds for a crew of six. By balancing the dimensions of the different compartments, a high degree of closure is attained at steady state, with 12 out of 14 compounds exhibiting zero loss, and oxygen and CO2 displaying only minor losses between iterations. This is the first stoichiometric model of a MELiSSA-inspired BLSS that describes a continuous provision of 100% of the food and oxygen needs of the crew. The stoichiometry serves as the foundation of an agent-based model of the MELiSSA loop, as part of the Evolving Asteroid Starships (E|A|S) research project.
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- 2023
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3. Toward Linguistic Recognition of Generalized Anxiety Disorder
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Laurens Rook, Maria Chiara Mazza, Iulia Lefter, and Frances Brazier
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generalized anxiety disorder ,mental distress ,emotion regulation ,natural language processing ,BIS/BAS ,Medicine ,Public aspects of medicine ,RA1-1270 ,Electronic computers. Computer science ,QA75.5-76.95 - Abstract
BackgroundGeneralized anxiety disorder (GAD) refers to extreme, uncontrollable, and persistent worry and anxiety. The disorder is known to affect the social functioning and well-being of millions of people, but despite its prevalence and burden to society, it has proven difficult to identify unique behavioral markers. Interestingly, the worrying behavior observed in GAD is argued to stem from a verbal linguistic process. Therefore, the aim of the present study was to investigate if GAD can be predicted from the language people use to put their anxious worries into words. Given the importance of avoidance sensitivity (a higher likelihood to respond anxiously to novel or unexpected triggers) in GAD, this study also explored if prediction accuracy increases when individual differences in behavioral avoidance and approach sensitivity are taken into account.MethodAn expressive writing exercise was used to explore whether GAD can be predicted from linguistic characteristics of written narratives. Specifically, 144 undergraduate student participants were asked to recall an anxious experience during their university life, and describe this experience in written form. Clinically validated behavioral measures for GAD and self-reported sensitivity in behavioral avoidance/inhibition (BIS) and behavioral approach (BAS), were collected. A set of classification experiments was performed to evaluate GAD predictability based on linguistic features, BIS/BAS scores, and a concatenation of the two.ResultsThe classification results show that GAD can, indeed, be successfully predicted from anxiety-focused written narratives. Prediction accuracy increased when differences in BIS and BAS were included, which suggests that, under those conditions, negatively valenced emotion words and words relating to social processes could be sufficient for recognition of GAD.ConclusionsUndergraduate students with a high GAD score can be identified based on their written recollection of an anxious experience during university life. This insight is an important first step toward development of text-based digital health applications and technologies aimed at remote screening for GAD. Future work should investigate the extent to which these results uniquely apply to university campus populations or generalize to other demographics.
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- 2022
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4. Design Framework for Social Interaction with Location-based Games
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Xavier Fonseca, Stephan Lukosch, and Frances Brazier
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Location-based ,Digital ,Games ,Social Interaction ,Public Space ,Design Framework ,Education ,Electronic computers. Computer science ,QA75.5-76.95 ,Computer software ,QA76.75-76.765 - Abstract
Location-based games invite players to have new forms of meaningful social interactions with others and provide opportunities for players to engage with their own neighbourhood’s public space. Earlier research on user requirements for such games have identified seven different activity types that have proven to initiate social interaction and capture real life exchanges for meaningful play-based social experiences. Yet, current understanding on what makes these games successful in such endeavours is still insufficient. This study furthers current understanding on the effects of location-based games for social interaction in local communities: it studies the forms of social interaction that the previously identified seven types of game activities elicit by analysing the nature and types of the exchanges they trigger. Based on this analysis, a design framework is proposed to 1) analyse existing location-based games and describe the forms of social interaction they trigger, and 2) help practitioners design new game activities that target specific forms of social interaction. This contributes to the enhancement of current understanding on the impact that these games can have in local communities, and on the way they can be better designed and used to promote social exchanges that are desired by players.
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- 2022
5. Together We Can Make It Work! Toward a Design Framework for Inclusive and Participatory City-Making of Playable Cities
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Geertje Slingerland, Stephan Lukosch, Mariëlle den Hengst, Caroline Nevejan, and Frances Brazier
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design framework ,participatory design ,playable city ,neighborhoods ,design spaces ,city-making ,Electronic computers. Computer science ,QA75.5-76.95 - Abstract
Making it work together can be challenging when various stakeholders are involved. Given the context of neighborhoods and cities specifically, stakeholders values and interests are not always aligned. In these settings, to construct long-term and sustaining participatory city-making projects, to make it work together, is demanding. To address this challenge, this paper proposes a design framework for inclusive and participatory city-making. This framework is inspired by the playable city perspective in that it endorses an open, exploratory, and interactive mindset of city actors. An extensive literature review on approaches taken for playful and participatory interventions in local communities provides the foundations for the framework. The review brings forward four pillars on which the framework is grounded and four activities for exploration of the design space for participatory city-making. A case study from The Hague (NL) is used to demonstrate how the framework can be applied to design and analyze processes in which city stakeholders together make it work. The case study analysis complements the framework with various research methods to support researchers, urban planners, and designers to engage with all city stakeholders to create playful and participatory interventions, which are inclusive and meaningful for the local community. The research contributions of this paper are the proposed framework and informed suggestions on how this framework in practice assists city stakeholders to together make it work.
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- 2020
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6. A Methodology to Develop Agent-Based Models for Policy Support Via Qualitative Inquiry
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Vittorio Nespeca, Tina Comes, Frances Brazier, Data Analytics and Digitalisation, RS: GSBE other - not theme-related research, and RS: GSBE MORSE
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empirical agent-based models ,OA-Fund TU Delft ,simulation methodology ,Computer Science (miscellaneous) ,General Social Sciences ,information management ,information diffusion ,crisis management ,research design - Abstract
Qualitative research is a powerful means to capture human interactions and behavior. Although there are different methodologies to develop models based on qualitative research, a methodology is missing that enables to strike a balance between the comparability across cases provided by methodologies that rely on a common and context-independent framework and the flexibility to study any policy problem provided by methodologies that focus on capturing a case study without relying on a common framework. Additionally, a rigorous methodology is missing that enables the development of both theoretical and empirical models for supporting policy formulation and evaluation with respect to a specific policy problem. In this article, the authors propose a methodology targeting these gaps for ABMs in two stages. First, a novel conceptual framework centered on a particular policy problem is developed based on existing theories and qualitative insights from one or more case studies. Second, empirical or theoretical ABMs are developed based on the conceptual framework and generic models. This methodology is illustrated by an example application for disaster information management in Jakarta, resulting in an empirical descriptive agent-based model.
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- 2023
7. It’s in the social network: The Social Neighbourhood model to unravel local social structures for liveable and safe neighbourhoods
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Geertje Slingerland, Igor Nikolic, and Frances Brazier
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Urban Studies ,Urban neighbourhoods ,Simulations ,Agent-based model ,Sociology and Political Science ,Tourism, Leisure and Hospitality Management ,Policy-making ,Development ,Livability - Abstract
Fast growth of cities decreases the quality of life in these places. In response, Municipalities install policies aiming to improve local livability. While literature suggests social structures to have a defining impact on policy effectiveness, current evaluation metrics are not able to take this into account. This paper presents the Social Neighbourhood model, an agent-based model used to simulate and explore how livability changes in a neighbourhood given various social structures and policies. The model is applied to a neighbourhood in The Hague, Netherlands. The main result of the modelling experiments is that social structures have a very strong influence on whether or not a policy to improve livability is effective. Three hypotheses, concerning this relationship between social structures, livability, and policy interventions are drawn up as a starting point for future research.
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- 2023
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8. Participatory Design of Participatory Systems for Sustainable Collaboration: Exploring Its Potential in Transport and Logistics
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Pieter van Langen, Gerdje Pijper, Pieter de Vries, and Frances Brazier
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value-sensitive design ,Renewable Energy, Sustainability and the Environment ,Geography, Planning and Development ,self-organisation ,systems thinking ,Building and Construction ,Management, Monitoring, Policy and Law ,sustainability ,collaboration ,business networks ,complex systems ,design thinking ,participatory design ,business network - Abstract
Challenges involving economic, environmental, and societal aspects necessitate organisations in business networks to collaborate. The scientific problem central to this paper is the difficulty of building sustainable collaborations. The research question is how to support organisations in building sustainable collaborations in their business relationships. This paper presents a new socio-technical approach to this end, i.e., PDPS (an acronym for Participatory Design of Participatory Systems) and explores its potential in a case study. PDPS is a value-based approach to the participatory design of participatory systems. Such socio-technical systems enable people working in different disciplines, departments, and organisational levels to create sustainable relationships supported by distributed information and communication technology. In a participatory system, participants gain trust, engagement, and empowerment to self-organise actions that produce results they could not have achieved alone. Following PDPS, participants collectively explore challenges in their relationship, define a joint value-based mission, and create a continuous process of self-organisation to fulfil this mission. In a case study, PDPS supported two Dutch business partners in solving recurring transport and logistics issues in retail store refurbishment projects. Turning their traditional business processes into participatory ones led to new solutions for sustainable transport and logistics, more joint business, and more profit. PDPS differs from other approaches in its involvement of all participants in a business relationship, its focus on shared values, and its capacity for creating a continuous process of self-organisation to fulfil a joint mission. This paper may support researchers, practitioners, and organisational policymakers interested in building sustainable collaborations in business networks.
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- 2023
9. The Influence of National Culture on Evacuation Response Behaviour and Time : An Agent-Based Approach
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Frances Brazier, Gert Jan Hofstede, Elvira Van Damme, and Dr. Natalie Van der Wal
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Agent-based model ,Evacuation response behaviour ,Toegepaste Informatiekunde ,WASS ,Cross-cultural ,Evacuation modelling ,Department of Social Sciences ,Information Technology ,Departement Maatschappijwetenschappen - Abstract
“How does culture, in combination with cues, settings and affiliation, influence response-phase behaviour and time and total evacuation time?”. A questionnaire and an agent-based model for a case study of a library evacuation in Czech Republic, Poland, Turkey and the UK have been developed to answer this question. Our questionnaire, conducted among 442 respondents (N = 105 from Czech Republic, N = 106 from Poland, N = 106 from Turkey and N = 125 from the United Kingdom), shows significant differences in the number of performed response tasks per culture - whereby Turkish respondents perform the most response tasks and British the least - and the results were directly implemented in our agent-based model. Simulation results show: (1) these differences - in combination with emergent effects for task choice and agent interactions - directly translate into the average response and evacuation times being highest for Turkey, followed by Poland, Czech Republic, and the UK, (2) cues, setting and affiliation influence response and evacuation time - such as being informed by staff giving a negative correlation and evacuating in groups a positive correlation with response time -, while the magnitude of these effects differ per culture. Our results suggest that faster response times might be related to dimensions of national culture, such as weak uncertainty avoidance and high individualism.
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- 2023
10. We’re in this together: Capacities and relationships to enable community resilience
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Geertje Slingerland, Eusebio Edua-Mensah, Marthe van Gils, Reinout Kleinhans, and Frances Brazier
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Urban Studies ,governance ,Geography, Planning and Development ,neighbourhoods ,Community resilience ,crisis management - Abstract
This paper studies how residents in the neighbourhood Bospolder-Tussendijken (BoTu) have dealt with the COVID-19 restrictions. Prior to the pandemic, significant investments in community-building were made to increase resilience of individuals and communities in BoTu. This paper identifies the key assets BoTu residents had developed and actually during this ultimate challenge. Interviews with formal and informal actors in BoTu revealed that community leadership, engaged governance, problem-solving ability, and information sharing environment were essential to adequately respond to the crisis, and were successfully deployed. The paper concludes with five policy implications to help strengthen capacities and relationships needed for community resilience.
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- 2022
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11. Incorporating the Theory of Attention in Applied Game Design
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Isabelle Kniestedt, Stephan Lukosch, Milan van der Kuil, Iulia Lefter, and Frances Brazier
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- 2022
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12. The need for a female perspective in designing agent-based negotiation support
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Katja Bouman, Iulia Lefter, Laurens Rook, Catharine Oertel, Catholijn Jonker, and Frances Brazier
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negotiation training systems ,women in negotiation ,perspective taking ,strategic empathy - Abstract
This study investigates whether an agent-based Negotiation Training System (NTS) can teach women Strategic Empathy - a recently introduced negotiation strategy based on perspective taking - and whether this can improve their negotiation performance. Developed and tested through an interaction-based real-time experiment was a NTS that integrated instructions on how to utilize Strategic Empathy. Women in the experimental group showed significantly higher levels of perspective-taking compared to the control group, and their understanding and use of Strategic Empathy increased over time. Also, a significant positive effect was found of Strategic Empathy on women's self-efficacy. No significant positive effect was found of Strategic Empathy on persistence. The high cognitive load of the experiment and a lack of intrinsic motivation may have caused this finding. Overall, this work demonstrates the applicability of using NTS to teach Strategic Empathy, and its effectiveness for enhancing women's self-efficacy in salary negotiations.
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- 2022
13. Participatory Design Going Digital: Challenges and Opportunities for Distributed Place-Making
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Geertje Slingerland, Maria Murray, Stephan Lukosch, John McCarthy, and Frances Brazier
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Summer school ,General Computer Science ,Local communities ,Place-making ,Summer School ,Digital arts ,Participatory design - Abstract
COVID-19 has urged researchers to explore new options for distributed participatory design, as physical meetings and workshops became unfeasible. This situation posed new challenges but also opportunities, in particular with respect to engagement and inclusion. This paper focuses on distributed PD with Irish teenagers to support place-making during this period: to build relationships with each other and the community. In a two-week online summer school, teenagers explored a concern or highlighted a unique aspect of their local community and designed digital artworks in response. Activities and materials were designed to support reflection, empowerment, inclusiveness, emergence, and playfulness for participatory place-making. Analysis of the summer school provides insights and guidance on the design of online PD for engaging experiences, especially in the context of place-making.
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- 2022
14. Conceptualising Resources-aware Higher Education Digital Infrastructure through Self-hosting: a Multidisciplinary View
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Lorenzo Angeli, Ö, Okur, Carlo Corradini, Marcel Stolin, Yilin Huang, Frances Brazier, and Maurizio Marchese
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As higher education digitalises, institutions increasingly outsource the development and management of their digital infrastructure including server hardware and services such as email, shared storage, and video conferencing, to private companies. This outsourcing trend is a change in paradigm, since universities have historically been pioneers in deploying and maintaining their own digital infrastructure, a practice also known as self-hosting. Digital infrastructure has a key role in all of a university’s functions: administration, research, and education. While outsourcing infrastructure has benefits in the form of convenience and lower costs, it also erodes institutional independence, centralises points of failure, and dele- gates highly relevant value choices about privacy, data ownership and environmental impact to external actors. In this article, we provide a first quantification of a potential return to self-hosting, emphasising its effect in energy reduction and avoided e-waste. We then outline some policy actions that could enable higher education institutions to re-take control over their digital infrastructure by building local services. This mode of operation reduces waste, and has the added benefit of increased resilience to scenarios of resource scarcity and collapse of external infrastructure. As an example of what could be achieved leveraging these policies, we detail the architecture of a low-impact data centre made of upcycled hardware and resource-aware software. By exploring our main structural choices we aim to showcase how, even starting from a generally heavy-weight software stack such as Kubernetes, there is significant space to reduce digital infrastructure’s overall resource footprint.
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- 2022
15. Analysing Participation in Electronic Networks of Practice (Preprint)
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Fatemeh Charkhsaz, Martijn Warnier, Mohammad Taghi Isaai, Frances Brazier, and Malihe Dayani
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BACKGROUND Electronic Networks of Practice (ENoP) are professional social networks in which professionals share knowledge, advice, and ideas with each other on challenges encountered in practice. Although different aspects of their use have been studied in the past ranging from the motivation of participants to the structure of emerging networks, very little is known about how professionals participate in ENoPs. OBJECTIVE This study proposes a comprehensive and detailed exploratory, conversation-based data analysis methodology to analyse closed, informal, and message-based ENoP participation, and also shows how this methodology can be used to study, develop, and maintain a well-connected and active ENoP. METHODS The proposed methodology includes a number of data analysis methods such as data clustering, social network analysis, Principal Component Analysis (PCA), correlation analysis, content analysis, and conversation analysis. It is applied to a case study for an ENoP in breast cancer treatment for which participation is analysed and guidelines formulated. RESULTS The results show how the methodology can be applied to analyse informal and messages-based ENoP participation including a specific conversation extraction method, a specific social network elements extraction method, and a set of macro and micro measures with which to determine participation. Applying the proposed methodology to a case of an ENoP in breast cancer treatment results in a dataset of 51 extracted conversations in 1000 messages between 100 specialists in breast cancer treatment. The results show the network participation is higher when an active, central and well-known specialist starts a conversation; when feedback is acknowledged; when an initiator or other active, central and well-known specialists are involved in a conversation; and when a conversation does not overlap with another active and ongoing conversation. As another result, 5 dimensions and 5 clusters of conversations are defined and how they relate to ENoP participation. CONCLUSIONS The findings inform the research literature in five ways: (i) how to analyse informal and messages-based ENoP participation; (ii) the role members of ENoP, in particular, central members and admins play to keep a conversation alive; (iii) the way in which professionals engage in conversations; (iv) triggers for more active, engaging, continued user participation; (v) dimensions and attributes of conversations in ENoP and how they relate to ENoP participation. The methodology and guidelines together provide ENoP researchers, developers, admins, and expert members a means with which to study, develop, and maintain a well-connected and active ENoP.
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- 2020
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16. Evaluating Critical Success Factors Model of Knowledge Management
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Mohammadbashir Sedighi, Sander van Splunter, Fardad Zand, and Frances Brazier
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Knowledge management is a critical issue in today's business world. Knowledge is considered to be one of the most strategic resources of a firm and sources of competitive advantage. This paper identifies and ranks Critical Success Factors (CSFs) for implementation of knowledge management in the Iranian Energy Sector. Using the Analytic hierarchy process (AHP) method the relative quantitative weights of 8 of the major CSFs for implementation of knowledge management are identified, based on analyses with KM designers in the Iranian energy sector. The outcomes of the research designate that the critical success factors in the order of importance are: corporate culture, human and financial resources, strategy and leadership, structures and procedures, meso environmental factors, knowledge management process, macro environmental factors, technology and infrastructure.
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- 2017
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17. Formalisation of a cooperation model based on joint intentions
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Frances Brazier, Catholijn Jonker, Jan Treur, Artificial intelligence, Network Institute, and Social AI
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SDG 17 - Partnerships for the Goals - Abstract
A cooperation model based on joint intentions introduced by Jennings is formalised within the modelling framework DESIRE for compositional multi-agent systems. By formalising the model in the DESIRE framework operationalisation and reusability of the model are obtained, as DESIRE specifications are executable and easily reusable.
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- 2015
18. Towards smart grid user engagement through social networking
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Yilin Huang, Scepanovic, S., Miorandi, D., Martijn Warnier, and Frances Brazier
- Published
- 2015
19. Increasing green energy market efficiency using micro agreements
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Kassidy P. Clark and Martijn Warnier Frances Brazier
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Poor coordination ,Wind power ,business.industry ,Market efficiency ,Production (economics) ,Energy market ,Environmental economics ,business ,Energy (signal processing) ,Sustainable energy ,Renewable energy - Abstract
The recent trend towards increased utilization of green energy sources promises a future of sustainable energy. However, green sources are typically intermittent and unpredictable (e.g. wind power), which leads to increased complexity and, ultimately, decreased efficiency. For example, it is estimated that 90% of the full energy potential of an average wind farm never reaches the end consumer due to poor coordination with consumers (Piwko et al., 2005). To enable better coordination, an energy market using short-term “micro” agreements is required to allow consumers to react in real time to changes in production. This will increase efficient utilization of green sources and reduce energy costs for the consumer. The current market framework cannot adapt quickly to changes due to the constraints of static leases and fixed prices. This means that green energy supply cannot always find green energy demand and vice versa, resulting in low market efficiency. This chapter describes a dynamic market with micro agreements that enables consumers to react to changes in green production.
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- 2013
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20. Transparency, consistency and modularity of strategic reasoning: An agent architecture for interactive business simulations
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Rick van Krevelen, Martijn Warnier, Frances Brazier, Alexander Verbraeck, and Thomas Corsi
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- 2011
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21. Law-abiding and integrity on the Internet: A case for agents.
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Frances Brazier, Anja Oskamp, Corien Prins, Maurice Schellekens, and Niek Wijngaards
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INTERNET laws ,INTERNET ,INTERNET fraud ,COMPUTER software - Abstract
Abstract Software agents extend the current, information-based Internet to include autonomous mobile processing. In most countries such processes, i.e., software agents are, however, without an explicit legal status. Many of the legal implications of their actions (e.g., gathering information, negotiating terms, performing transactions) are not well understood. One important characteristic of mobile software agents is that they roam the Internet: they often run on agent platforms of others. There often is no pre-existing relation between the owner of a running agents process and the owner of the agent platform on which an agent process runs. When conflicts arise, the position of the agent platform administrator is not clear: is he or she allowed to slow down the process or possibly remove it from the system? Can the interests of the user of the agent be protected? This article explores legal and technical perspectives in protecting the integrity and availability of software agents and agent platforms. [ABSTRACT FROM AUTHOR]
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- 2004
22. Anonymity and software agents: An interdisciplinary challenge.
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Frances Brazier, Anja Oskamp, Corien Prins, Maurice Schellekens, and Niek Wijngaards
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COMPUTER software ,INTERNET industry ,ELECTRONIC commerce ,COMPUTER industry - Abstract
Abstract Software agents that play a role in E-commerce and E-government applications involving the Internet often contain information about the identity of their human user such as credit cards and bank accounts. This paper discusses whether this is necessary: whether human users and software agents are allowed to be anonymous under the relevant legal regimes and whether an adequate interaction and balance between law and anonymity can be realised from both the perspective of Computer Systems and the perspective of Law. [ABSTRACT FROM AUTHOR]
- Published
- 2004
23. Simulating Solar Forecasting for Energy Market Decision Models
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Nina Voulis, Özge Okur, Martijn Warnier, and Frances Brazier
24. A Framework for Developing Agent-Based Distributed Applications
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Ma, Oey, Splunter, S., Efyl, Ogston, Martijn Warnier, and Frances Brazier
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