1,721,180 research outputs found
Enabling resource sharing in heterogeneous wireless sensor networks
No full textWireless Sensor Networks (WSNs) are trending towards environments comprised of multiple parties owning many devices. In this environment, node owners want to share their sensor nodes' limited resources, but need to be able to limit resource access and to charge for the resource usage. Node users need to handle the complexity of deploying functionality on very heterogeneous networks. Current WSN approaches enable building large scale applications, yet often ignore node heterogeneity or assume a single party owns and manages the network. This paper proposes three contributions: 1) a resource modeling language, 2) a system architecture and 3) a tool for assisted and validated application planning and deployment across heterogeneous networks. A prototype shows the feasibility and illustrates the opportunities of controlled sharing of node services.sponsorship: Research funded by a Ph.D. grant of the Agency for Innovation by Science and Technology (IWT). This research is partially funded by the Research Fund KU Leuven, the EU FP7 project NESSoS, and iMinds (a research institute founded by the Flemish government). With the financial support from the Prevention of and Fight against Crime Programme of the European Union (B-CCENTRE). The research is conducted in the context of the COMACOD project.status: Publishe
Flexible integration of data qualities in wireless sensor networks
Full text linkWireless sensor networks have been confirmed as a valuable asset to deploy in an increasing number of real-world business scenarios. The existence of several run-time reconfigurable component models for networked embedded systems facilitates this as they enable developers to build complete end-to-end systems composed of reusable building blocks. However, the integration of sensor networks with enterprise environments is not straightforward as it requires that several long-standing challenges related to data quality management and security be addressed. This paper advocates a high-level policy-based approach to more easily support the specification and enforcement of these non-functional requirements in existing component compositions for network embedded systems. We have realized and evaluated a prototype of this framework for the LooCI component model.status: Publishe
Users as reconfigurable elements in distributed sensing applications
No full textNext generation sensing applications will be large-scale with multiple human actors, including: administrators, application developers, participatory sensing volunteers and consumers of sensor data. In these sensing scenarios, both human actors and software artefacts should be reconfigurable at runtime. A middleware solution for this class of sensing application should provide a relationship amongst equals, wherein human actors and software artefacts may be explicitly configured and reconfigured using a single consistent development model. In recent years, Online Social Networks have proven to be a successful and popular mechanism through which millions of people have created digital representations of themselves and their relationships. We combine a reconfigurable component model with online social networks to create a middleware that allows software and human actors to be composed into reconfigurable distributed applications. This allows developers to create dynamic sensing applications with the human explicitly in the loop.status: Publishe
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“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
Trusted Operations On Mobile Phones
No full textThe widespread use of mobile devices has allowed the development of participatory sensing systems that capture various types of data using the existing sensors on mobile devices in order to upload the data to cloud based services for later use. Gathering data from such sources requires a mechanism to establish trust on the sensor data. For example an application may require a proof of authenticity of sensor readings originating from anonymous sources. Establishment of trust on the sensor data has been addressed in the literature. However, in many cases this sensor data needs to be preprocessed on the device itself before being uploaded to the target server. This processing could include resizing of images, hiding identifiable faces and sensitive data in images, anonymization of GPS data etc. while ensuring the chain of trust from data capture to the delivery of data to the consumer. There is a need for a framework that provides a means to implement arbitrary operations to be performed on trusted sensor data while guaranteeing the authenticity of the data. This paper presents the design and implementation of a framework that allows the capture of trusted sensor data, the development of trusted operations on sensor data, and provides a mechanism for performing predefined trusted operations on the sensor data such that the chain of trust is maintained. Evaluation shows that the performance of the proposed system is reasonable and that the trust guarantees are strong.sponsorship: This research is partially funded by the research fund KU Leu-
ven, the ICON-SeRGIo project and the HI 2 -DT/Universal4Mobile
project.status: Publishe
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Full text linkWe 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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