1,720,952 research outputs found
A graph-matching approach to indoor localization: using a mobile device and a reference BIM
No full textIndoor localization provides for a much researched subject, as the complexity and size of many public buildings require extensive and properly designed methods to facilitate location specific processes. Indoor localization entails finding a qualitative description of the occupied area, that is human interpretable, rather than a quantitative position in Euclidean space. In other words, the context of an indoor environment has to be understood, such that a position can be transcended to a meaningful location. A space is defined as a mathematical structure with relational properties, to which all its members adhere. As a subset of space, topological space describes the relationships between (parts of) objects that do not change under continuous transformation. It further defines metric space, as a set where distances and angles between all of its elements are defined. Indoor space is then interpreted as a structure bounded by physical or functional elements, enabling human activities. It should entail the geometric place an actor is in, the topological structure that place is a part of, and the semantics giving the place meaning. Many indoor positioning methods have been developed, which can provide an actor with a relative geometric place. Most preferred are positioning systems not relying on a contingent system, which can be performed using a hybrid fusion of sensors embedded into a mobile device. Such a system found to perform sufficiently is VI-SLAM, simultaneously building a geometric place and tracking each pose and heading relatively. Its output is a mesh model, in which a viewshed of the indoor environment is built. From a mesh model, a topological structure can be derived in the form of its dual graph. Now to finalize this representation of indoor space which can be captured using a mobile device, it has to be enriched with a meaningful context. These semantics are generally stored in BIM models. Thus to transcend the position retrieved using SLAM to a location, is has to be matched with a BIM model, so that the appertaining semantics can be connected.The method proposed provides for a possibility to perform graph-based indoor localization, by extracting a graph from both input sources and comparing them, in order to find a match. However different in nature and structure, both input sources can be converted to a graph of similar calibre, such that they can be tested for a match. All operations performed on the graphs are derived from spectral graph theory. The graph simplification and analysis is performed using the eigen spectrum of the graph Laplacian, and the match is performed by remapping the spectral graphs into a vector sub space using the eigen spectrum of the data covariance matrix. After a match between both graphs is found, the current position of the actor within the mesh model can be translated to the room found in the graph. This room is now connected to a room within the reference graph, for which the semantics are stored in the BIM. Returning these to the actor, a location description is formed.Geomatic
Locatiebepaling binnen gebouwen op basis van spectrale graafanalyse
No full textAl kennen we in Nederland een rijke kartografische en topografische geschiedenis, het publiek domein binnen gebouwen blijft een terra incognita: een grote verzameling witte vlekken. In het bijzonder voor mobiele applicaties is er nog geen weg gevonden naar automatisch werkende navigatiesystemen en het type kaart dat daaraan ten grondslag zou moeten liggen. De puzzelstukjes die samen een werkend indoor navigatiesysteem zouden kunnen vormen, worden steeds verder ontwikkeld - wat steeds meer mogelijkheden biedt om oplossingen te ontwerpen, te ontwikkelen en te testen.GIS TechnologieDesign Informatic
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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