1,720,976 research outputs found
Big Web Colors: Analyzing the World Top Sites
No full textColors are obviously important for web sites, but how much? in this paper we try to study the problem of abstracting from the actual content, and analyze if and how colors in images have a higher-level fundamental importance. Focusing on the world top web sites, we collected a large pool (almost two millions) of images, and then investigated the relationships of colors with the attractiveness of a page. Can colors alone boost the success of a page, and in what terms? To answer this question we developed an experiment involving a large number of people, measuring how and how much colors affect a page, abstracting from the content. The results show that, rather surprisingly, colors do have a more fundamental significance that can be decoupled from the underlying shapes. We provide qualitative and quantitative insights on how important colors are, and how they actually impact the success of a site in terms of user perception
A run in the wind: favorable winds make the difference in drone delivery
Full text linkThe impact on the energy consumption of flying drones in favorable winds is investigated in this paper. A tandem system is considered, with only one drone and one truck. The truck moves on a predefined route and brings the drone close to the delivery point. Then, the drone plans its service route by choosing the take-off and landing points from which the delivery will be performed. We propose a constant time algorithm OSR to plan the drone route with minimum-energy service when the truck moves on a line in front of the deliveries (i.e., highway). Then, we devise the algorithm MS-OSR to plan a drone minimum-energy service route when the truck moves on a multiline that bounds a convex area where the deliveries take place. We found that OSR and MS-OSR plan drone service routes that save at least 30% and 60%, respectively, of the energy consumed by connecting the delivery and the truck following the shortest route, that is, following the perpendicular segment between the delivery point and the truck’s route
How the Wind Can Be Leveraged for Saving Energy in a Truck-Drone Delivery System
Full text linkIn this work, we investigate the impact of the wind in a drone-based delivery system. For the first time, to the best of our knowledge, we adapt the trajectory of the drone to the wind. We consider a truck-drone tandem delivery system. The drone actively reacts to the wind adopting the 'most tailwind' trajectory available between the truck's path and the delivery. The truck moves on a predefined route and carries the drone close to the delivery point. We propose the Minimum-energy Drone-trajectory Problem (MDP) which aims, when the wind affects the delivery area, at planning minimum-energy trajectories for the drone to serve the customers starting from and returning to the truck. We then propose two algorithms that optimally solve MDP under two different routes of the truck. We also analytically study the feasibility of sending drones with limited battery to deliver packages. Finally, we first numerically compare our algorithms on randomly generated synthetic and real data, and then we evaluate our model simulating the drone's flight in the BlueSky simulator
Predicting neuromuscular control patterns that minimize ACL forces for injury prevention: Proof of concept on a muscle-driven 6DOF knee model
No full textReliability and repeatability assessment of single camera 2D and 3D markerless approach for sport applications
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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
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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