Power saving in wireless ad hoc networks without synchronization

Power saving strategies generally attempt to maximize the time that nodes spend in a low power consumption sleep state. Such strategies often require the sender to notify the receiver about pending traffic using some form of traffic announcement. Although asynchronous traffic announcement mechanisms are particularly suitable for the ad hoc environment, they also provide relatively limited power savings. This paper proposes a mechanism that improves the efficiency of asynchronous traffic announcement mechanisms by reducing the proportion of time that nodes need to spend awake, while still maintaining good connectivity properties. The mechanism is based on allowing traffic announcements to be rebroadcast by neighbouring nodes

Extension Rules for Ontology Evolution within a Conceptual Modelling Tool

Ontology development and maintenance are complex tasks, so automatic tools are essential for a successful integration between the modeller’s intention and the formal semantics in an ontology. Never- theless, tools need to provide a way to capture the intuitive structures inherent to the conceptual modelling and to focus on ontology elements currently being refactored by abstracting the user from the whole ontol- ogy without losing consistency. This can be done by means of a set of extension rules that identify elements from an ontology and suggest pos- sible consistent evolutions. Rules guide the development of ontologies by taking source elements and refactoring. In this paper, we present a small catalogue of extension rules to cover these identified requirements and thus to be integrated into a tool for ontological modelling as built- in reasoning services. Each rule is defined and analysed by considering different theories of design patterns.Sociedad Argentina de Informática e Investigación Operativa (SADIO

Extension Rules for Ontology Evolution within a Conceptual Modelling Tool

Ontology development and maintenance are complex tasks, so automatic tools are essential for a successful integration between the modeller’s intention and the formal semantics in an ontology. Never- theless, tools need to provide a way to capture the intuitive structures inherent to the conceptual modelling and to focus on ontology elements currently being refactored by abstracting the user from the whole ontol- ogy without losing consistency. This can be done by means of a set of extension rules that identify elements from an ontology and suggest pos- sible consistent evolutions. Rules guide the development of ontologies by taking source elements and refactoring. In this paper, we present a small catalogue of extension rules to cover these identified requirements and thus to be integrated into a tool for ontological modelling as built- in reasoning services. Each rule is defined and analysed by considering different theories of design patterns.Sociedad Argentina de Informática e Investigación Operativa (SADIO

Visual attention is a single, integrated resource

AbstractRecent evidence for separate forms of attention for different visual attributes seems to conflict with Duncan’s “integrated competition” theory of visual attention. To resolve this conflict, we established attention-operating characteristics for four pairs of visual discriminations. While one task was common to every pair, the other tasks were different and concerned different visual attributes. In all pairs, the common task exhibited the same performance-resource function, whether the other tasks involved entirely similar, partially similar, or entirely dissimilar visual attributes. These results confirm that visual attention conforms exactly to the predictions of a single, integrated resource

Managing behavioural and psychological symptoms in community dwelling older people with dementia:1. A systematic review of the effectiveness of interventions

© 2018 The Author(s) This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence CC BY 4.0 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.Background: Two-thirds of people living with dementia live at home in the UK and many experience distressing behavioural and psychological symptoms. This systematic review evaluates the effectiveness of non-pharmacological interventions for behavioural and psychological symptoms among community-dwelling people living with dementia. Methods: This two-stage review undertook an initial mapping of the literature followed by a systematic review of relevant randomised controlled trials. We searched electronic databases for pertinent studies reporting outcomes from interventions from January 2000 to March 2015 and updated searches in October 2016. We included studies that considered behavioural and psychological symptom management for older people living with dementia who live at home and excluded studies conducted in long-term care settings. This paper presents findings from a narrative synthesis of 48 randomised controlled trials evaluating interventions for people living with dementia alone, family carers alone and patient-carer dyads. Results: We retrieved 17,871 de-duplicated records and screened them for potential inclusion. Evidence from 48 randomised controlled trials suggests that family carer training and educational programmes that target problem behaviours and potential triggers can improve outcomes. Nurses and occupational therapists appear to help people with dementia with behavioural and psychological symptoms, but professional comparisons are lacking and there is no shared language about or understanding of behavioural and psychological symptoms amongst professionals, or between professionals and family carers. Conclusions: Future research should focus on the effectiveness of components of multi-faceted programmes and their cost effectiveness and include qualitative data to better target interventions for behavioural and psychological symptoms. It is important to consider family carer readiness to use non-pharmacological strategies and to develop a shared language about the inherent needs and communications of behavioural and psychological symptoms.Peer reviewe

Prototypical Components of Honeybee Homing Flight Behavior Depend on the Visual Appearance of Objects Surrounding the Goal

Honeybees use visual cues to relocate profitable food sources and their hive. What bees see while navigating, depends on the appearance of the cues, the bee’s current position, orientation, and movement relative to them. Here we analyze the detailed flight behavior during the localization of a goal surrounded by cylinders that are characterized either by a high contrast in luminance and texture or by mostly motion contrast relative to the background. By relating flight behavior to the nature of the information available from these landmarks, we aim to identify behavioral strategies that facilitate the processing of visual information during goal localization. We decompose flight behavior into prototypical movements using clustering algorithms in order to reduce the behavioral complexity. The determined prototypical movements reflect the honeybee’s saccadic flight pattern that largely separates rotational from translational movements. During phases of translational movements between fast saccadic rotations, the bees can gain information about the 3D layout of their environment from the translational optic flow. The prototypical movements reveal the prominent role of sideways and up- or downward movements, which can help bees to gather information about objects, particularly in the frontal visual field. We find that the occurrence of specific prototypes depends on the bees’ distance from the landmarks and the feeder and that changing the texture of the landmarks evokes different prototypical movements. The adaptive use of different behavioral prototypes shapes the visual input and can facilitate information processing in the bees’ visual system during local navigation

Towards Conceptual Modelling Interoperability in a Web Tool for Ontology Engineering

The definition of suitable visual paradigms for ontology modelling is still an open issue. Despite obvious differences between the expressiveness of conceptual modelling (CM) languages and ontologies, many proposed tools have been based on UML, EER and ORM. Additionally, all of these tools support only one CM as visual language, reducing even more their modelling capabilities. In previous works, we have presented crowd as a Web architecture for graphical ontology designing in UML and logical reasoning to verify the relevant properties of these models. The aim of this tool is to extend the reasoning capabilities on top of visual representations as much as possible. In this paper, we present an extended crowd architecture and a new prototype focusing on an ontology-driven metamodel to enable different CMs visual languages for ontology modelling. Thus facilitating inter-model assertions across models represented in different languages, converting between modelling languages and reasoning on them. Finally, we detail the new architecture and demonstrate the usage of the prototype with simple examples

An Automated Technique for Analysis of Orthogonal Variability Models based on Anti-patterns Detection using DL reasoning

During a Software Product Line (SPL) variability management, model validation is crucial so as to detect faults in early development stages and avoid affecting derived products quality. Therefore, the automated variability analysis has emerged for translating and validating variability models. In this work, we present a catalogue of anti-patterns, which describes scenarios associated to the detection of problems in a SPL. Moreover, we extend crowd-variability, a novel graphical tool designed for modelling and validating Orthogonal Variability Models (OVM), for detecting such anti-patterns using Description Logics (DL)-based reasoning services.XI Workshop Innovación en Sistemas de Software.Red de Universidades con Carreras en Informátic