Transform-based Distributed Data Gathering

A general class of unidirectional transforms is presented that can be computed in a distributed manner along an arbitrary routing tree. Additionally, we provide a set of conditions under which these transforms are invertible. These transforms can be computed as data is routed towards the collection (or sink) node in the tree and exploit data correlation between nodes in the tree. Moreover, when used in wireless sensor networks, these transforms can also leverage data received at nodes via broadcast wireless communications. Various constructions of unidirectional transforms are also provided for use in data gathering in wireless sensor networks. New wavelet transforms are also proposed which provide significant improvements over existing unidirectional transforms

A Probabilistic Interpretation of Sampling Theory of Graph Signals

We give a probabilistic interpretation of sampling theory of graph signals. To do this, we first define a generative model for the data using a pairwise Gaussian random field (GRF) which depends on the graph. We show that, under certain conditions, reconstructing a graph signal from a subset of its samples by least squares is equivalent to performing MAP inference on an approximation of this GRF which has a low rank covariance matrix. We then show that a sampling set of given size with the largest associated cut-off frequency, which is optimal from a sampling theoretic point of view, minimizes the worst case predictive covariance of the MAP estimate on the GRF. This interpretation also gives an intuitive explanation for the superior performance of the sampling theoretic approach to active semi-supervised classification.Comment: 5 pages, 2 figures, To appear in International Conference on Acoustics, Speech, and Signal Processing (ICASSP) 201

Graph Variogram: A novel tool to measure spatial stationarity

Irregularly sampling a spatially stationary random field does not yield a graph stationary signal in general. Based on this observation, we build a definition of graph stationarity based on intrinsic stationarity, a less restrictive definition of classical stationarity. We introduce the concept of graph variogram, a novel tool for measuring spatial intrinsic stationarity at local and global scales for irregularly sampled signals by selecting subgraphs of local neighborhoods. Graph variograms are extensions of variograms used for signals defined on continuous Euclidean space. Our experiments with intrinsically stationary signals sampled on a graph, demonstrate that graph variograms yield estimates with small bias of true theoretical models, while being robust to sampling variation of the space.Comment: Submitted to IEEE Global Conference on Signal and Information Processing 2018 (IEEE GlobalSIP 2018), Nov 2018, Anaheim, CA, United States. (https://2018.ieeeglobalsip.org/

Relational conflict is not too bad for employees when they have developed their emotional intelligence skills

Team conflict constitutes one of the most prevalent team processes in the workplace (Benítez et al., 2011; De Dreu, 2010), especially in competitive organizational contexts, such as, university organizations (Matthiesen & Einarsen, 2007). De Wit, Greer, & Jehn (2012) 's methanalysis showed that, team conflict is not always negative for employees well-being. Its effects are depending on the conflict type and conflict contexts. In this sense, research has shown that, task conflict could be positive for job satisfaction and, relationship conflict consequences of well-being could be buffer when team members have good skills to solve conflicts (De Dreu et al., 2004; Seong & Choi, 2014). Emotional intelligence has come to be seen as a key concept for the development of organizations. Especially in professions that require continuous management of interpersonal relationships, such as, teachers (Extremera & Fernández-Berrocal, 2004, Jiménez & López-Zafra, 2007). When individuals are in a conflict situation, whatever the type, they face the same ones influenced by their emotional state (Barry & Fulmer, 2004; Montes 2014). Therefore, employees with high emotional intelligence may be better able to cope with conflict-induced stress than people who do not have such a skill (Armstrong et al., 2011). However, despite the existence of empirical evidence on the influence of emotional intelligence on the adequate management of conflict, there are few studies that have analyzed the moderating role of emotional intelligence in the relationship between both types of conflict (task and relationship conflict) and burnout. This study extends the conflict literature by examining the moderating role of emotional intelligent on the relationship between two conflict types (task conflict and relationship conflict) and burnout core (emotional exhaustion and depersonalization)

Space, mass and ornament in the Gothic-Renaissance transition in Spain

La introducción en España de las nuevas formas y sintaxis renacentistas a lo largo del siglo xvi no se produjo con un abandono radical e inmediato de los viejos usos góticos, de validez comprobada en trascendentales cuestiones del diseño arquitectónico. La renovación de la producción fue heterogénea y en cierto modo particular de cada artífice, según su formación previa y el grado de contacto, coherencia y compromiso con las novedades italianas, generando un panorama híbrido y plural en la arquitectura del quinientos hispano. Atendiendo a significativos textos y documentos gráficos de la época, se pretende rastrear los cambios, e inercias, en el proceso de diseño arquitectónico durante esta larga etapa de transición, estructurando el análisis a partir de tres categorías sustanciales, interdependientes y autónomas a la vez: espacio, masa y ornato.During the sixteenth century the new Renaissance forms were introduced in Spain, but the Gothic procedures continued to be used due to their proven validity for the architectural design. The renovation of the architecture was heterogeneous and different for each master, according to his previous training and his knowledge of the new Italian forms. This involved a hybrid and plural context in the Spanish architecture of the 16th century. The changes and continuities of the architectural design process during this transitory stage are investigated in this paper, based on significant texts and graphic documents of this period. The analysis is structured based on three substantial architectural categories, which are simultaneously interdependent and autonomous: space, mass and ornamen