University of Siegen
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Publication Access status: Metadata only , Video Conferencing(2023); The COVID-19 pandemic has reorganized existing methods of exchange, turning comparatively marginal technologies into the new normal. Multipoint videoconferencing in particular has become a favored means for web-based forms of remote communication and collaboration without physical copresence. Taking the recent mainstreaming of videoconferencing as its point of departure, this anthology examines the complex mediality of this new form of social interaction. Connecting theoretical reflection with material case studies, the contributors question practices, politics and aesthetics of videoconferencing and the specific meanings it acquires in different historical, cultural and social contexts.Source Type:Book4 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , 1 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Small Business Computers made in Europe (1960s–1980s)The technical and economic history of data technologies tends to focus on the US history of mainframes and personal computers. From this perspective, genuinely European developments in data processing are often declared to be non-innovative marginal phenomena. However, long before the triumph of the PC, with its version of “mid-range computing”, the European office machine industry brought computers into offices “. This volume analyzes how office machines were developed into computers in Europe in the 1960s and successfully sold on European markets, until the PC became a universal office machine in the 1980s. From the perspective of companies, national, and European Community industrial and research policies, it shows this European path into the computer age. <bold>With contributions by</bold> Christian Berg | Christian Franke | Michael Homberg | Armin Müller | Matthias RöhrSource Type:Book3 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Analysis of the sound insulation performance of periodic wall structures by a virtual acoustic laboratoryThe propagation of acoustic waves in periodic structures, also known as phononic crystals or PCs, is prohibited in certain frequency ranges, which are referred to as the frequency band-gaps. The existence, the location and the width of the frequency band-gaps are mainly determined by the geometrical parameters and the material properties of the PCs. In this work, a virtual acoustic laboratory based on a fully coupled fluid-structure interaction (FSI) model is developed to determine the sound insulation capacity of one-dimensional (1D) and two-dimensional (2D) periodic walls. The FSI model is discretized using the frequency-domain spectral element method (FDSEM), which is an advanced finite element method (FEM) using special high-order shape functions. Following the guidelines of the ISO10140, the setup of the developed FSI model allows us to take into account the essential physical phenomena, especially the interaction of the wall structure with the fluid domains (air). The FSI model based on the FDSEM increases the computational efficiency and accuracy in comparison with the standard FEM. Several numerical examples will be presented and discussed to show that the designed periodic walls in certain frequency ranges within the band-gaps may exhibit much better sound insulation capabilities than monolithic walls.Source Type:Article3 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Metascheduling Using Discrete Particle Swarm Optimization for Fault Tolerance in Time-Triggered IoT-WSNIn time-triggered systems, adaptation is performed by using metascheduling approaches to ensure temporal predictability. Wireless sensor networks (WSNs) are growing to be used as a reliable, an energy-efficient, and a scalable network infrastructure for numerous Internet of Things (IoT) applications. Because of run-time changes because of failure events, a metascheduling system is required to address the changes by precomputing schedules for several context events at design time. Therefore, this paper proposes a metascheduler that solves a new scheduling problem for each adaptation scenario in IoT-WSN using our offline algorithm named discrete particle swarm optimization for reliable task allocation (DPSO-TA), resulting in a multi-schedule graph that combines the repeated schedules. In this work, a time-triggered IoT-WSN metascheduler is proposed that takes into considerations the node or link failures that are common in WSN. Single and two failure events are considered, where a graph for all feasible schedules is formed at the network design time. Such a large number of schedules causes a state space explosion problem, which is managed using a re-convergence method. Different application model sizes and network topologies are used to assess the proposed metascheduler under various failure event scenarios. The results show a reduction in the size of the multi-schedule graph by applying inputs with different deadline values and different number of tasks. Furthermore, the validity suggested by the proposed metascheduler, which is the ratio of valid to invalid schedules, is improved when compared to algorithms that schedule tasks to hosts with the shortest completion time or algorithms that select hosts for a set of sorted tasks based on energy consumed and task arrival time.Source Type:Article1 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Tourist encounters with a “GoPro”: three layers of hike&fly paragliding travels(2023)Hike&fly is a recent development in adventure tourism combining cross-country paragliding flights with hiking in remote destinations and is currently under-researched as a relatively new tourism phenomenon. As it highly intersects with media technologies such as the GoPro, the paper explores how this media technology can introduce new ways of studying mobile tourist practices from a more-than-representational perspective. By drawing on work in mobility and media studies, the paper argues that the GoPro does not simply record the subjective viewpoints of the users and their environment but also modifies how users encounter and make sense of destinations. Through challenging the former notion, the paper makes two contributions to tourism geographies: First, the paper provides background – based on preliminary fieldwork – on the recent development of hike&fly paragliding travels and the role of GoPro in the context of adventure tourism. Secondly, it contributes a methodological framework for further studies on tourist encounters with a "GoPro" by proposing a three-layered approach that considers the GoPro's ability to augment the human body, record a video trace, and generate somatic images.Source Type:Article3 - Some of the metrics are blocked by yourconsent settings
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Publication Access status: Metadata only , Acquisition of English relative clauses by native speakers of Kurdish Sorani(2023)The present study investigates several linguistic factors that might be determinants of differences in the ease of acquisition of relative clauses (RCs) in L2 contexts, using the acquisition of English relative clauses by Kurdish Sorani native speakers. The analysis of 1440 subject and object RCs formed by Kurdish Sorani-speaking learners of English in a sentence combination task and a sentence translation task indicates that the syntactic functions of the noun phrase (NP) relativized in the RC, the position of the RC in the matrix clause (whether centre- or right-embedded), and the properties of RCs in L1 affect the acquisition and the formation of RCs in L2. The study also provides evidence that the syntactic functions of the relativized NP in the matrix clause, and the consistency/inconsistency of word orders in L1 and L2 do not influence the acquisition of RCs in L2.Source Type:Article2 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Lay Theologians as Experts in the Early Modern Period(2023)In the Early Modern period, many professions, including theology, did not yet have systems to validate expertise. Some laypeople were able to acquire deep theological knowledge or have more impact than church-ordained theologians. The Reformation promoted the idea of a »Priesthood of Believers,« but it remained little developed, since clergy continued to administer sacraments. Lay activity surged in the sixteenth and seventeenth centuries under the influence of spiritualists, who believed that all things are connected by the Divine, and thus, that people do not need clergy to access God. Christian theosophers saw nature as divine revelation, and their study of the natural world also began to undermine traditional theology. Since through confessionalization, state and church power were deeply intertwined, the state tried to enforce adherence to confession. The attempts of the early modern state to define who could act as a theologian have left traces in modern historiography.Source Type:Article1 - Some of the metrics are blocked by yourconsent settings
Publication Access status: Metadata only , Subgroup Membership in GL(2,Z)(2023)It is shown that the subgroup membership problem for a virtually free group can be decided in polynomial time when all group elements are represented by so-called power words, i.e., words of the form $p_1^{z_1} p_2^{z_2} \cdots p_k^{z_k}$. Here the $p_i$ are explicit words over the generating set of the group and all $z_i$ are binary encoded integers. As a corollary, it follows that the subgroup membership problem for the matrix group $\textsf{GL}(2,\mathbb {Z})$ can be decided in polynomial time when elements of $\textsf{GL}(2,\mathbb {Z})$ are represented by matrices with binary encoded integers. For the same input representation, it also shown that one can compute in polynomial time the index of a given finitely generated subgroup of $\textsf{GL}(2,\mathbb {Z})$.Source Type:Article3
