1,721,036 research outputs found
Predictive Data Reduction in Wireless Sensor Networks Using Selective Filtering for Engine Monitoring
No full textIn a wireless sensor network, transmissions consume a large portion of a node’s energy budget. Data reduction is generally acknowledged as an effective means to reduce the number of network transmissions, thereby increasing the overall network lifetime. This paper builds on the Spanish Inquisition Protocol (SIP), to further reduce transmissions in a single-hop wireless sensor system aimed at a gas turbine engine exhaust gas temperature (EGT) monitoring application. A new method for Selective Filtering of sensed data based on state identification has been devised, using a skewed double exponentially weighted moving average filter for accurate state predictions. Low transmission rates are achieved even when significant temperature step changes occur. A simulator was implemented to generate flight temperature profiles similar to those encountered in real-life, which enabled tuning and evaluation of the algorithm. The results, summarised over 280 simulated flights of variable duration (from approximately 58 min to 14 h), show an average reduction in the number of transmissions by 95, 99.8, and 91% in the takeoff, cruise, and landing phases, respectively, compared to transmissions encountered by a sense-and-send system sampling at the same rate. The algorithm generates an average error of 0:11 0:04 °C over a 927 °C range. © Springer New York 2015
Wireless sensor and mobile ad-hoc networks: vehicular and space applications
No full textThis book describes the practical perspectives in using wireless sensor networks (WSN) to develop real world applications that can be used for space exploration. These applications include sensor interfaces, remote wireless vehicles, space crew health monitoring and instrumentation. The material discusses how applications of WSN originally developed for space travel and exploration are being applied and used in multiple real world applications, allowing for the development of smart systems that have characteristics such as self-healing, self-diagnosis, and emergency healthcare notification. This book also: · Discusses how multidisciplinary fields can be implemented in a single application · Reviews exhaustively the state-of-the-art research in WSN for space and vehicular applications · Covers smart systems that have self-healing, self-diagnosis, and emergency healthcare notificatio
Design of a Social Collaboration and Precise Localization Services for the Blind and Visually Impaired
No full textAbstractThe Blind and Visually Impaired (BVI) encounter various difficulties during their daily activities like path planning, navigation and obstacle avoidance. Many BVI still trust and rely on the white cane to explore their environments. The state-of-the-art white canes have audio systems to guide the BVI through their environment. In this paper, we present a top-down design approach for a social collaboration service especially designed for the BVI. We also present a precise localization approach for indoor and outdoor environments which serves as the underlying foundation for the social collaboration environment
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Exploiting Client-Side Collected Measurements to Perform QoS Assessment of IaaS
No full textDelivering reliable service offerings to clients remain a challenging aspect in today's cloud infrastructure. A broad number of research studies have undertaken the service evaluation process from one side; that is, the infrastructure's perspective. Conversely, clients' assessment to the service has been mostly neglected. In this paper, we propose a client-side service evaluation approach which mainly relies on the clients' assessment of infrastructure's service offerings. The proposed approach utilizes the strength of the Social Network Analysis (SNA) principles in conjunction with the Generalized Extreme Value Theorem (EVT) to converge to a precise Quality of Service (QoS) model. Our goal in this research is to build precise QoS models to predict the performance of clients that exhibit similar behaviors. Thus, we develop a novel SNA-based clustering algorithm that analyzes the strength of the interconnection links between clients and cluster related clients in communities of similar behaviors. The proposed approach is effective in providing Infrastructure as a Service (IaaS) providers with a better assessment tool to evaluate and improve their service offerings. The experimental results of the proposed approach on GENI's SEATTLE platform demonstrate its ability to enhance the prediction process of the performance of IaaS service offerings. 2002-2012 IEEE.Scopus2-s2.0-8493919431
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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