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Aslan, Y. (author), Roederer, A.G. (author), Fonseca, Nelson J.G. (author), Angeletti, Piero (author), Yarovoy, Alexander (author)An innovative reconfigurable beamforming network concept for multiple high-gain agile and mutually zero-forced beam generation is proposed. Four-port couplers and variable phase shifters are used to synthesize the network. A 2 beam by 7 element beam former is designed and fabricated as proof of concept. A static scenario with the two beams...conference paper 2024
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Guzman, Borja Genoves (author), Mir, Muhammad Sarmad (author), Fonseca, Dayrene Frometa (author), Galisteo, Ander (author), Wang, Q. (author), Giustiniano, Domenico (author)Visible Light Communication (VLC) has emerged in the last few years as a promising technology not only for high-speed communication but also for serving a new generation of Internet of Things (IoT) devices that may leverage the pervasive lighting infrastructures. Integrating VLC in lighting environments for IoT requires the design of...journal article 2023
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Francis, Diana (author), Fonseca, Ricardo (author), Mattingly, Kyle S. (author), Lhermitte, S.L.M. (author), Walker, Catherine (author)Pine Island Glacier (PIG) has recently experienced increased ice loss that has mostly been attributed to basal melt and ocean ice dynamics. However, atmospheric forcing also plays a role in the ice mass budget, as besides lower-latitude warm air intrusions, the steeply sloping terrain that surrounds the glacier promotes frequent Foehn winds. An...journal article 2023
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Fonseca, Xavier (author), Lukosch, Stephan (author), Brazier, F.M. (author)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...journal article 2022
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Francis, Diana (author), Fonseca, Ricardo (author), Mattingly, Kyle S. (author), Marsh, Oliver J. (author), Lhermitte, S.L.M. (author), Cherif, Charfeddine (author)The calving of Antarctic ice shelves remains unpredictable to date due to a lack of understanding of the role of the different climatic components in such events. In this study, the role of atmospheric forcing in the calving of the Brunt Ice Shelf (BIS) in February 2021 is investigated using a combination of observational and reanalysis data....journal article 2022
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Fonseca, Xavier (author), Lukosch, S.G. (author), Brazier, F.M. (author)Location-based games (LBGs) are becoming increasingly more popular, especially those that focus on social interaction in public space. They have been successful to various extents at bringing players together to interact in public space; yet there is lack of knowledge and consensus on how to design these games from a technical perspective. This...conference paper 2022
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Medina, Edgardo (author), Fonseca, Carlos Roberto (author), Gallego-Alarcón, Iván (author), Morales Napoles, O. (author), Gómez-Albores, Miguel Angel (author), Esparza-Soto, Mario (author), Mastachi-Loza, Carlos Alberto (author), García-Pulido, Daury (author)Technical, economic, regulatory, environmental, and social and political interests make the process of selecting an appropriate wastewater treatment technology complex. Although this problem has already been addressed from the dimensioning approach, our proposal in this research, a model of decision making for conventional secondary treatment of...journal article 2022
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Fonseca, Xavier (author)This thesis broadens current understanding of how location-based games can promote meaningful social interaction in citizens' own neighbourhoods. It investigates social cohesion and the role of social interaction to its promotion, delves into which requirements users have for playing in their neighbourhood and with its citizens, and takes a...doctoral thesis 2021
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Aslan, Y. (author), Roederer, A.G. (author), Fonseca, Nelson J.G. (author), Angeletti, Piero (author), Yarovoy, Alexander (author)Orthogonality in multibeam antennas is revisited. The difference between orthogonal beamforming and zero-forced beamforming is highlighted. The intriguing relation between orthogonality, reciprocity and losses is recapitulated. Different approaches on the design of orthogonal beamforming networks and implementation of zero-forced beamforming...journal article 2021
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Fonseca, Xavier (author), Lukosch, S.G. (author), Lukosch, H.K. (author), Brazier, F.M. (author)Social interaction is part of the fabric of society and is essential to challenge many types of social barriers. Location-based games (LBGs) provide a means to foster such interaction in local communities. The design of such games is currently based primarily on designer experience and on the literature on game design in general, and not on...journal article 2021
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Fonseca, Xavier (author), Slingerland, G. (author), Lukosch, S.G. (author), Brazier, F.M. (author)Digital serious games have shown to be effective in promoting citizen engagement and social interaction. The reasons for their success are, however, unknown. This paper proposes design recommendations to support designers of serious games for meaningful social interaction, based on player preferences, needs and desires, based on literature...journal article 2021
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Ramaswamy, K. R. (author), Fonseca, R. M. (author), Leeuwenburgh, O. (author), Siraj, M.M. (author), Van den Hof, P.M.J. (author)We are concerned with the efficiency of stochastic gradient estimation methods for large-scale nonlinear optimization in the presence of uncertainty. These methods aim to estimate an approximate gradient from a limited number of random input vector samples and corresponding objective function values. Ensemble methods usually employ Gaussian...journal article 2020
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- Fonseca, R. M. (author), Rossa, E. Della (author), Emerick, A. A. (author), Hanea, R. G. (author), Jansen, J.D. (author) contribution to periodical 2020
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Slingerland, G. (author), Fonseca, Xavier (author), Lukosch, S.G. (author), Brazier, F.M. (author)Location-based activities can challenge citizens to explore their neighbourhood in new playful ways. This paper presents a classification of such playful activities based on the literature and experience gained (1) in co-creation sessions and (2) gameplay for neighbourhood exploration with citizens in the Hague. The location-based game designed...journal article 2020
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Fonseca, Xavier (author), Lukosch, S.G. (author), Brazier, F.M. (author)Location-based games (LBGs) successfully promote playful experiences engaging millions of players throughout the world. The potential of embedding such location-based experiences in educational practice has been recognised but not yet fully embraced. LBGs and educational location-based applications have been used to enhance critical thinking,...journal article 2020
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Fonseca, Xavier (author), Lukosch, S.G. (author), Brazier, F.M. (author)This paper describes different types of activities/challenges designed for social interaction, while discussing the performance of such challenges using the mobile digital game “Secrets of the South” (http://secretsofthesouth.tbm.tudelft.nl/, Secrets of the South). The game was played as part of a scientific meeting, with participants from 25...conference paper 2019
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Jesus de Moraes, R. (author), Fonseca, Rahul-Mark (author), Helici, Mircea A. (author), Heemink, A.W. (author), Jansen, J.D. (author)We present an efficient workflow that combines multiscale (MS) forward simulation and stochastic gradient computation - MS-StoSAG - for the optimization of well controls applied to waterflooding under geological uncertainty. A two-stage iterative Multiscale Finite Volume (i-MSFV), a mass conservative reservoir simulation strategy, is employed as...journal article 2019
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Fonseca, Xavier (author), Lukosch, S.G. (author), Brazier, F.M. (author)This paper provides a general overview on different perspectives and studies on social cohesion, offers a definition of social cohesion that is deeply rooted in current literature, and provides a framework that can be used to characterize social cohesion and help support resilient cities. The framework highlights the factors that play a...journal article 2018
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Fonseca, R. M. (author), Della Rossa, E. (author), Emerick, A. A. (author), Hanea, R. G. (author), Jansen, J.D. (author)Since the early 2000's there has been a significant focus from many groups around the world towards the development and application of innovative technologies in order to improve reservoir management strategies and optimize field development plans. Benchmark studies are a very valuable way of evaluating and demonstrating the status and...conference paper 2018
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- Fonseca, J. (author), Sim, W.W. (author), Shire, T. (author), O'Sullivan, C. (author) conference paper 2017