Any biometric recognizer is vulnerable to direct spoofing attacks and automatic speaker verification (ASV) is no exception; replay, synthesis and conversion attacks all provoke false acceptances unless countermeasures are used. We focus on voice conversion (VC) attacks. Most existing countermeasures use full knowledge of a particular VC system to detect spoofing. We study a potentially more uni...

Verspagen has been made possible by a fellowship of the Royal Netherlands Academy of Arts and Sciences. Working Papers are interim reports on work of the International Institute for Applied Systems Analysis and have received only limited review. Views or opinions expressed herein do not necessarily represent those of the Institute, its National Member Organizations, or other organizations suppo...

In this chapter, we discuss an evaluation of a computerized information system in an elderly care unit. The evaluation is based on the concept of actability, which is a combination of theories from Human-Computer Interaction and the Language Action Perspective. The reason for uniting different theories is to obtain a more holistic evaluation model. The findings show that the evaluated system ha...

When developing information systems business modelling is needed in order to highlight the essentials of businesses. Patterns of inter-related speech acts are the basis for identifying essentials in Language/Action-oriented approaches for business modelling. Weigand et al. has made an attempt to conceptualise the notion of patterns in a layered architecture founded in such approaches. In this p...

The grown complexity of the modern enterprise poses a series of challenges, among them keeping competitiveness in the fast changing environment in which the enterprise evolves. Addressing Enterprise Integration is considered as a key to achieve the goal of any enterprise either it is a single or a networked enterprise. Enterprise Modelling is a prerequisite to enable the common understanding of...

Achieving an adequate business-software alignment should include capturing essential aspects that concern the studied business reality as well as reflecting them in the software specification. This concerns semantic and pragmatic aspects, such as meanings, intentions, negotiations, commitments, and obligations, whose appropriate consideration is beyond the capabilities of current software desig...

In this article we describe potential contributions of a Models and Modeling Perspective to research focused on learners’ developing conceptions about uncertainty and variation. In particular, we show how a particular class of realistic problem-solving tasks can illuminate how learners develop models to identify, describe, and predict emergent patterns of regularity in the behavior of various t...

The CAiSE 98 paper “Architecture and Quality in Data Warehouses” and its expanded journal version [18] was the first to add a Zachman-like [37] explicit conceptual enterprise modeling perspective to the architecture of data warehouses. Until then, data warehouses were just seen as collections of – typically multidimensional and historized – materialized views on relational tables, without consi...

Non-Boolean variables are important primitives in logical modeling. For instance, in Answer Set Programming (ASP), they are used as place holders for constants and more complex ground terms. This is essential for compact and uniform encodings used in ASP although variables are removed in a grounding phase preceding the search for answer sets. On the other hand, in theories in the Satisfiability...

On August 19, 1839, the Palace of the Institute in Paris was completely full with curious Parisians who came to hear the formal description of the new reproduction process invented by Louis Daguerre. Daguerre, already well-known for his Diorama, called the new process daguerreotype. 1 According to a contemporary, "a few days later, opticians' shops were crowded with amateurs panting for daguerr...