Dynamically Driven Emergence in a Nanomagnetic System

Emergent behaviors occur when simple interactions between a system's constituent elements produce properties that the individual elements do not exhibit in isolation. This article reports tunable emergent behaviors observed in domain wall (DW) populations of arrays of interconnected magnetic ring-shaped nanowires under an applied rotating magnetic field. DWs interact stochastically at ring junctions to create mechanisms of DW population loss and gain. These combine to give a dynamic, field-dependent equilibrium DW population that is a robust and emergent property of the array, despite highly varied local magnetic configurations. The magnetic ring arrays’ properties (e.g., non-linear behavior, “fading memory” to changes in field, fabrication repeatability, and scalability) suggest they are an interesting candidate system for realizing reservoir computing (RC), a form of neuromorphic computing, in hardware. By way of example, simulations of ring arrays performing RC approaches 100% success in classifying spoken digits for single speakers.     

Macroscopic and microscopic techno-economic analyses highlighting aspects of 5G transport network deployments

Photonic Network Communications - 5G networks will comprise multiple, versatile infrastructures at finest granularity consisting of multiple disaggregated pools of network, compute and storage...     

Horacio Coppola: Towards an Aesthetic Genealogy

Although a milestone in the history of Latin American photography, the work of Horacio Coppola is little known outside Argentina. His unorthodox angles and tilting frames, his attention to industrial and urban themes, and his experimentation with different lenses in the period between 1927 and 1931 were in absolute synchrony with the precepts of European New Vision and New Objectivity photography, and with American straight photography. That Coppola’s visual idiom was in tune with the latest photographic developments in interwar Europe is obvious. What remains unclear is how exactly he achieved that synchrony. Several scholars have wrestled with this question, which nevertheless remains elusive due to lack of evidence of direct contact with European photography prior to his studies at the Berlin Bauhaus in 1932 and his repeated attempts to downplay the influence contemporary photographers had on his work. The article provides a systematic study of Coppola’s aesthetic genealogy and his photographic borrowings through a critical examination of his early pictures and theoretical writings. It teases out possible direct and indirect channels of dialogue with the New Vision, New Objectivity, and straight photography in the second half of the 1920s, and probes the reasons behind Coppola’s reluctance to admit a connection with contemporary European photography in particular.     

End-to-end model-transformation comprehension through fine-grained traceability information

Software and Systems Modeling - The construction and maintenance of model-to-model and model-to-text transformations pose numerous challenges to novice and expert developers. A key challenge...     

Challenges and opportunities in renovating public sector information by enabling linked data and analytics

Linked Data has become the current W3C recommended approach for publishing data on the World Wide Web as it is sharable, extensible, and easily re-usable. An ecosystem of linked data hubs in the Public Sector has the potential to offer significant benefits to its consumers (other public offices and ministries, as well as researchers, citizens and SMEs), such as increased accessibility and re-use value of their data through the use of web-scale identifiers and easy interlinking with datasets of other public data providers. The power and flexibility of the schema-defying Linked Data, however, is counterbalanced by inborn factors that diminish the potential for cost-effective and efficient adoption by the Public Sector. The paper analyzes these challenges in view of the current state-of-the-art in linked data technologies and proposes a technical framework that aims to hide the underlying complexity of linked data while maintaining and promoting the interlinking capabilities enabled by the Linked Data Paradigm. The paper presents the innovations behind our proposed solutions as well as their advantages, especially for the non-expert users.     

An empirical comparison between stochastic and deterministic centroid initialisation for K-means variations

Machine Learning - K-Means is one of the most used algorithms for data clustering and the usual clustering method for benchmarking. Despite its wide application it is well-known that it suffers...     

Formal and relational governance in IT outsourcing: substitution,complementarity and the role of the psychological contract

This study aims to contribute to the literature on IT outsourcing governance by advancing our understanding of mechanisms of substitution and complementarity between formal and relational governance. Our study illustrates certain conditions under which substitution and complementarity can occur and depicts a two‐way causal relationship between them. Our examination further provides a more in‐depth assessment of relational governance by using the concept of the psychological contract. Our results demonstrate that the psychologically binding nature of the psychological contract makes it a particularly forceful substitute to formal governance, while its associations with other relationship aspects make it a forceful complement.     

The “Panopticon” of search engines: the response of the European data protection framework

Nowadays, Internet users are depending on various search engines in order to be able to find requested information on the Web. Although most users feel that they are and remain anonymous when they place their search queries, reality proves otherwise. The increasing importance of search engines for the location of the desired information on the Internet usually leads to considerable inroads into the privacy of users. A heated debate is currently ongoing at European level regarding the question if search engine providers that are established outside the European Union are covered by the European data protection framework and the obligations it imposes on entities that process personal data. The scope of this paper is to examine the applicability of the European data protection legislation to non-EU-based search engine providers and to study the main privacy issues with regard to search engines, such as the character of search logs, their anonymisation and their retention period. Ixquick, a privacy-friendly meta-search engine, will be presented as an alternative to privacy intrusive existing practices of search engines.