17,417 research outputs found
"Un'Italiana a Sissi. Looking at pottery through a southern lens", in M. Anastasiadou et alii, The Sissi Archaeological Project. A mosaic of histories
No full textThe contribute is part of a long paper dedicated to the Sissi Archaeological Project
q-Differential equations for q-classical polynomials and q-Jacobi-Stirling numbers
No full textWe introduce, characterise and provide a combinatorial interpretation for the so-called q-Jacobi–Stirling numbers.
This study is motivated by their key role in the (reciprocal) expansion of any power of a second order
q-differential operator having the q-classical polynomials as eigenfunctions in terms of other even order operators,
which we explicitly construct in this work. The results here obtained can be viewed as the q-version of
those given by Everitt et al. and by the first author, whilst the combinatorics of this new set of numbers is a
q-version of the Jacobi–Stirling numbers given by Gelineau and the second author
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Network Q
No full textA press release from Network Q announcing that they will begin featuring Brian McNaught, a gay columnist and author, for a monthly segment
Network Q
No full textA press release from Network Q announcing that they will begin featuring Brian McNaught, a gay columnist and author, for a monthly segment
Tobin's Q and Financial Policy
No full textRecent research in macroeconomics has emphasized the importance of linking the financial and real sectors and the need for working with optimizing models. Tobin’s Q model of investment would appear to provide a framework that can satisfy these two criteria. In contrast to the original presentation of the Q model, the formal development has not recognized that the firm actively participates in a number of financial markets; in this broader context, we show that Q is likely to be an uninformative and possibly misleading signal for investment expenditures . We then endeavor to turn this negative theoretical result to positive advantage in resolving a number of empirical problems with Q models, but the modifications dictated by the theory receive little support from the data.
A Q-learning based multi-strategy integrated artificial bee colony algorithm with application in unmanned vehicle path planning
No full textArtificial bee colony (ABC) is a prominent algorithm that offers great exploration capabilities among various meta-heuristic algorithms. However, its monotonous and one-dimensional search strategy limits its searching performance in the solving process. Thus, to address this issue, a Q-learning based multi-strategy integrated ABC algorithm (QMABC) is proposed. In the QMABC, multiple search strategies are proposed to utilize different individual experiences and search approaches for solution updates. Then, Q-learning is employed for strategy selection. In comparison to previous studies, this paper introduces more effective state and action configurations within the framework of Q-learning. To evaluate the performance of the QMABC, CEC 2017 benchmark functions are adopted to compare it to different meta-heuristic algorithms including ABC based and non-ABC based algorithms. Moreover, applications in path planning are implemented to further verify the effectiveness of the QMABC. Overall, it should be highlighted that the proposed QMABC demonstrates superiority in both numerical and practical experiments.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Discrete Mathematics and Optimizatio
Lost in Translation: Settlement Organization in Postpalatial Crete—A View from the East
No full textThis contribution will consider problems and issues related to understanding architecture and urbanism in postpalatial Crete in its larger Mediterranean context, with reference particularly to Philistia but also to Cyprus and mainland Greece (Fig. 13.1). Comparisons with Philistia and Cyprus are relevant because many scholars have argued for a migration to these regions in the form of large scale colonization, and they have attempted to identify Aegean influences and even direct architectural transfers in these regions (as outlined in sections 13.2 and 13.4). This paper takes a more moderate or minimalist position: that any migration to these regions from the Aegean was limited and entangled, taking the form of what Knapp (2008: 266–8, 289, 292, 356; see also Hitchcock and Maeir 2013) has termed a ‘hybridization process’. However, a comparative approach among the Mediterranean regions has value regardless of where one positions oneself on the issue of migration, cross-cultural influence, and/or interconnections (see now Knapp and Manning 2016). The value lies in cross-cultural patterning that may be identified based on common postpalatial changes in social organization, structures, and practices; levels of technology; climate; and geography. It is the search for such patterning that typifies the approach to studying culture in cultural anthropology (e.g. Haviland et al. 2011). The benefit in identifying architectural patterns and differences across IIIC pottery-producing cultures can help to identify both common social practices and regional differences. Furthermore, we will argue that understanding architecture on multiple scales (urbanism, curation, design, and technique) in this era should emphasize IIIC commonalities, rather than past studies that have privileged and over-emphasized continuities with the palatial Bronze Age. While such continuities are interesting and worth drawing attention to, emphasizing them minimizes the significance of the breakdown and diminishing of official architectural styles. In addition, given that the data base for architecture is much smaller than for ceramic studies, a comparative approach can bring new insights gained by using different methods—as in Driessen’s study of complementarity in the different use of similar spaces by males and females as indicated by different types of artefact patterning in each space (see chapter 5).</p
Event-Based Communication in Distributed Q-Learning
No full textWe present an approach to reduce the communication of information needed on a Distributed Q-Learning system inspired by Event Triggered Control (ETC) techniques. We consider a baseline scenario of a Distributed Q-Learning problem on a Markov Decision Process (MDP). Following an event-based approach, N agents sharing a value function explore the MDP and compute a trajectory-dependent triggering signal which they use distributedly to decide when to communicate information to a central learner in charge of computing updates on the action-value function. These decision functions form an Event Based distributed Q learning system (EBd-Q), and we derive convergence guarantees resulting from the reduction of communication. We then apply the proposed algorithm to a cooperative path planning problem, and show how the agents are able to learn optimal trajectories communicating a fraction of the information. Additionally, we discuss what effects (desired and undesired) these event-based approaches have on the learning processes studied, and how they can be applied to more complex multi-agent systems.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Team Manuel Mazo J
Academic Writing Q&A Series 4
No full textThe presentation describes the processes that typically follow article submission. This presentation serves as the basis for a video from the Academic Writing Q&A series that was created as a supplement to the My First Scientific Article webinar. This presentation highlights the critical issues the author needs to take into account during the writing or peer review process that are essential to publishing. The content is useful for Early Career Researchers and for everyone who is interested in scholarly communication and publishing
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