Recurrence-based time series analysis by means of complex network methods

Complex networks are an important paradigm of modern complex systems sciences which allows quantitatively assessing the structural properties of systems composed of different interacting entities. During the last years, intensive efforts have been spent on applying network-based concepts also for the analysis of dynamically relevant higher-order statistical properties of time series. Notably, many corresponding approaches are closely related with the concept of recurrence in phase space. In this paper, we review recent methodological advances in time series analysis based on complex networks, with a special emphasis on methods founded on recurrence plots. The potentials and limitations of the individual methods are discussed and illustrated for paradigmatic examples of dynamical systems as well as for real-world time series. Complex network measures are shown to provide information about structural features of dynamical systems that are complementary to those characterized by other methods of time series analysis and, hence, substantially enrich the knowledge gathered from other existing (linear as well as nonlinear) approaches.Comment: To be published in International Journal of Bifurcation and Chaos (2011

Grounding Dynamic Spatial Relations for Embodied (Robot) Interaction

This paper presents a computational model of the processing of dynamic spatial relations occurring in an embodied robotic interaction setup. A complete system is introduced that allows autonomous robots to produce and interpret dynamic spatial phrases (in English) given an environment of moving objects. The model unites two separate research strands: computational cognitive semantics and on commonsense spatial representation and reasoning. The model for the first time demonstrates an integration of these different strands.Comment: in: Pham, D.-N. and Park, S.-B., editors, PRICAI 2014: Trends in Artificial Intelligence, volume 8862 of Lecture Notes in Computer Science, pages 958-971. Springe

Topological Foundations of Cognitive Science

A collection of papers presented at the First International Summer Institute in Cognitive Science, University at Buffalo, July 1994, including the following papers: ** Topological Foundations of Cognitive Science, Barry Smith ** The Bounds of Axiomatisation, Graham White ** Rethinking Boundaries, Wojciech Zelaniec ** Sheaf Mereology and Space Cognition, Jean Petitot ** A Mereotopological Definition of 'Point', Carola Eschenbach ** Discreteness, Finiteness, and the Structure of Topological Spaces, Christopher Habel ** Mass Reference and the Geometry of Solids, Almerindo E. Ojeda ** Defining a 'Doughnut' Made Difficult, N .M. Gotts ** A Theory of Spatial Regions with Indeterminate Boundaries, A.G. Cohn and N.M. Gotts ** Mereotopological Construction of Time from Events, Fabio Pianesi and Achille C. Varzi ** Computational Mereology: A Study of Part-of Relations for Multi-media Indexing, Wlodek Zadrozny and Michelle Ki

People, Land, Arts, Culture and Engagement: Taking Stock of the Place Initiative

This report serves as a point of entry into creative placemaking as defined and supported by the Tucson Pima Arts Council's PLACE Initiative. To assess how and to what degree the PLACE projects were helping to transform communities, TPAC was asked by the Kresge Foundation to undertake a comprehensive evaluation. This involved discussion with stakeholders about support mechanisms, professional development, investment, and impact of the PLACE Initiative in Tucson, Arizona, and the Southwest regionally and the gathering of qualitative and quantitative data to develop indicators and method for evaluating the social impact of the arts in TPAC's grantmaking. The report documents one year of observations and research by the PLACE research team, outside researchers and reviewers, local and regional working groups, TPAC staff, and TPAC constituency. It considers data from the first four years of PLACE Initiative funding, including learning exchanges, focus groups, individual interviews, grantmaking, and all reporting. It is also informed by evaluation and assessment that occurred in the development of the PLACE Initiative, in particular, Maribel Alvarez's Two-Way Mirror: Ethnography as a Way to Assess Civic Impact of Arts-Based Engagement in Tucson, Arizona (2009), and Mark Stern and Susan Seifert's Documenting Civic Engagement: A Plan for the Tucson Pima Arts Council (2009). Both of these publications were supported by Animating Democracy, a program of Americans for the Arts, that promotes arts and culture as potent contributors to community, civic, and social change. Both publications describe how TPAC approaches evaluation strategies associated with social impact of the arts in Tucson and Pima County. This report outlines the local context and historical antecedents of the PLACE Initiative in the region with an emphasis on the concept of "belonging" as a primary characteristic of PLACE projects and policy. It describes PLACE projects as well as the role of TPAC in creating and facilitating the Initiative. Based on the collective understanding of the research team, impacts of the PLACE Initiative are organized into three main realms -- institutions, artists, and communities. These realms are further addressed in case studies from select grantees, whose narratives offer rich, detailed perspectives about PLACE projects in context, with all their successes, rewards, and challenges for artists, communities, and institutions. Lastly, the report offers preliminary research findings on PLACE by TPAC in collaboration with Dr. James Roebuck, codirector of the University of Arizona's ERAD (Evaluation Research and Development) Program