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In this paper we give conditions that a discrete time switched linear systems must satisfy if it is stable. We do this by calculating the mean and covariance of the set of matrices obtained by using all possible switches. The theory of switched linear systems has received considerable attention in the systems theory literature in the last two decades. However, for discrete time switched systems the...
This work addresses the leader election problem in distributed systems where processes can crash and recover. More precisely, it focuses on implementing the Omega failure detector class, which provides a leader election functionality, in the crash-recovery failure model. The concepts of quiescence and near-quiescence for an algorithm implementing Omega are defined. Depending on the use or not of stable...
The question how exactly gesture and emotion are interrelated is still sparsely covered in research, yet highly relevant for building affective artificial agents. In our study, we investigate how basic gestural form features (handedness, hand shape, palm orientation and motion direction) are related to components of emotion. We argue that material produced by actors in filmed theater stagings are...
In order for virtual characters to be believable when expressing emotion, researchers are trying to endow them with a personality focusing mostly on lexical approaches from Psychology. Whereas multimodal corpora are developing to inform the definition of models relating emotion and their expression in different modalities, they seldom enable to study the impact of personality on the way individuals...
Individual differences have been reported in the literature on nonverbal communication. Recent development in the collection and evaluation of audiovisual databases of social behaviors brings new insight on these matters by exploring other types of social behaviors and other approaches to individual differences. This paper summarizes two experimental studies about personality differences in the audiovisual...
This work presents the development of a real-time framework for the research of multimodal feedback of robots/talking agents in the context of Human Robot Interaction (HRI) and Human Computer Interaction (HCI). For evaluating the framework, a Multimodal corpus is built (ENTERFACE_STEAD), and a study on the important multimodal features was done for building an active Robot/Agent listener of a storytelling...
Although the relations between affects and posture were the focus of several studies in Psychology, their consideration in multimodal corpora research remains scarce. In this paper we survey related studies and propose a framework for studying affective postures by integrating knowledge coming from multiple sources such as literature, video corpora, motion capture data, artistic design, and perception...
Understanding what are the characteristics of protein-protein interfaces is at the core of numerous applications.This paper introduces a method in which the proteins are described with surfacic geometrical elements. Starting from a database of known interfaces, the method produces the elements and combinations thereof that are characteristic of the interfaces. This is done thanks to a frequent item...
From a computer security perspective, services provided by distributed information systems may be organized based on their security attributes goals and requirements; these processes and services are categorized as anonymous, registered, encrypted and trusted. In this research, we propose a solution for operational trust assurance problems where vulnerabilities reduction is implicitly observed. Collaborative...
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