University of Paderborn

About: University of Paderborn is a education organization based out in Paderborn, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Computer science & Context (language use). The organization has 6684 authors who have published 16929 publications receiving 323154 citations.

CHiME-6 Challenge: Tackling multispeaker speech recognition for unsegmented recordings

Abstract: Following the success of the 1st, 2nd, 3rd, 4th and 5th CHiME challenges we organize the 6th CHiME Speech Separation and Recognition Challenge (CHiME-6). The new challenge revisits the previous CHiME-5 challenge and further considers the problem of distant multi-microphone conversational speech diariza-tion and recognition in everyday home environments. Speech material is the same as the previous CHiME-5 recordings except for accurate array synchronization. The material was elicited using a dinner party scenario with efforts taken to capture data that is representative of natural conversational speech. This paper provides a baseline description of the CHiME-6 challenge for both segmented multispeaker speech recognition (Track 1) and unsegmented multispeaker speech recognition (Track 2). Of note, Track 2 is the first challenge activity in the community to tackle an unsegmented multispeaker speech recognition scenario with a complete set of reproducible open source baselines providing speech enhancement, speaker diarization, and speech recognition modules.

Dominance of chemotaxis in a chemotaxis–haptotaxis model

Abstract: This paper deals with the Neumann problem for the coupled chemotaxis–haptotaxis model of cancer invasion given byfor x ∈ Ω and t > 0 with, respectively, given nonnegative initial data u0 and w0, where χ, ξ and μ are positive parameters, Ω is a bounded domain in , and n ≥ 1, with smooth boundary.The goal of this work is to identify two parallels between the solution behaviour in () and that in the corresponding two-component chemotaxis system obtained when w ≡ 0:• For the latter, it has been known that for any choice of , solutions are global and remain bounded under the conditionThe first result of this paper says that the above statement remains true for arbitrarily large haptotactic ingredients: If () holds, then for any ξ > 0 and all reasonably smooth w0, () possesses a globally defined solution which is bounded in each of its components.• With regard to the qualitative solution behaviour, this work identifies an explicit smallness condition on w0 which under the assumption () asserts exponential decay of w in the large time limit, whereas both u and v persist in a certain sense.

A degenerate chemotaxis system with flux limitation: Maximally extended solutions and absence of gradient blow-up

Abstract: This paper aims at providing a first step toward a qualitative theory for a new class of chemotaxis models derived from the celebrated Keller–Segel system, with the main novelty being that diffusion is nonlinear with flux delimiter features. More precisely, as a prototypical representative of this class we study radially symmetric solutions of the parabolic–elliptic system under the initial condition and no-flux boundary conditions in balls Ω⊂ℝn, where χ>0 and .The main results assert the existence of a unique classical solution, extensible in time up to a maximal Tmax∈(0,∞] which has the property that The proof of this is mainly based on comparison methods, which first relate pointwise lower and upper bounds for the spatial gradient ur to L∞ bounds for u and to upper bounds for ; second, another comparison argument involving nonlocal nonlinearities provides an appropriate control of z+ in terms of bounds for u and |ur|, with suitably mild dependence on the latter.As a consequence of (⋆), by means...

Self-aware Computing Systems: An Engineering Approach

Abstract: Taking inspiration from self-awareness in humans, this book introduces the new notion of computational self-awareness as a fundamental concept for designing and operating computing systems. The basic ability of such self-aware computing systems is to collect information about their state and progress, learning and maintaining models containing knowledge that enables them to reason about their behaviour. Self-aware computing systems will have the ability to utilise this knowledge to effectively and autonomously adapt and explain their behaviour, in changing conditions. This book addresses these fundamental concepts from an engineering perspective, aiming at developing primitives for building systems and applications. It will be of value to researchers, professionals and graduate students in computer science and engineering.