1,720,988 research outputs found
Detection of sheep and goat milk adulterations by direct MALDI–TOF-MS analysis of milk tryptic digests
No full textPeriodic Feedback Control for Streaming 3D Videos in Last-Generation Cellular Networks
No full textTransmitting stereoscopic 3D videos on cellular networks is a challenging issue because effective scheduling is necessary for reproducing frames continuously, without wasting bandwidth in frame retransmissions. We propose a scheduling algorithm that allows the user of interactive videos to perform VCR-like actions other than the usual playback (e.g., pause or fast forward at different speeds) with less problems. The algorithm exploits periodic feedback packets coming from the client to the server through the Real-time Transport Control Protocol and communicating the client buffer fill level. A P-controller uses this information to dynamically regulate the scheduled bitrate. The approach is compared with classical scheduling algorithms. Different 3D video formats and quality degrees are considered. Results show that the simple controller is very effective and outperforms the other schedulers in all the analyzed scenarios
MALDI-ToF MS for quality control of high protein content sport supplements
No full textHigh protein content sport nutritional supplements are found as powder products containing, asingredients, amino acids and proteins with important nutritional values as milk, soy and egg proteins.An EU Food Supplements Directive (2002) requires that supplements should be safe, both in dosagesand in purity. It is important, then, to develop rapid and sensitive methods to be employed for the qualitycontrol of these substances. In this work, we apply, for the first time, matrix-assisted laser desorptionionization-mass spectrometry as a fast, reproducible and sensitive method for the quality control of sportnutritional supplements based on proteins.To this aim, several commercial egg- and/or milk-based powder products have been processed by in gelor in solution digestion and analyzed in comparison to pure standard products. This strategy allowed toassess the reliability of the indications on proteins (as caseins, whey proteins and ovalbumin) declared inthe label of several sport nutritional supplements
Reduced Fractional Modeling of 3D Video Streams: the FERMA Approach
Full text linkMultimedia streaming of three-dimensional (3D) stereoscopic videos over last-generation networks subject to bandwidth limitations is an open problem. The development and spread of communication networks and devices that accept 3D videos is not supported by proper scheduling strategies. Namely the high variability of streams should be considered to reduce effects of network delays, packet losses, shortage of bandwidth resources, and shared use by multiple clients. Then, it is important to improve the characterization of 3D videos for more effective streaming. To this aim, this paper proposes a fractional exponential reduction moments approach based on the statistics of the so-called fractional moments. Each random sequence of frames in 3D videos can be analyzed and reduced to a finite set of parameters, that allow fitting to the sequence by exponential functions and then a characterization and classification of the video by a sort of fingerprint. The method does not depend on the format and the encoding technique of the video. Finally, the approach will allow comparing real streams and numerical data output from fractional dynamical models by means of the reduced parameters. Statistical proximity between time series and a fractional model or between different models simplifies formalization and classification of fractional models
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
Statistics of Fractional Moments Applied to 3D Video Streams
No full textThe interest in processing three-dimensional (3D) videos is ever increasing because of the exponential growth of sophisticated devices supporting 3D streams. However, transmitting compressed 3D videos on channels with relatively limited bandwidth resources is a challenging research problem, because of the high variability of 3D streams. A stable and robust characterization of the statistical properties of 3D videos could be very useful for several applications (bandwidth management and control by effective schedulers/controllers, call admission control schemes, etc.). This work proposes a straightforward characterization method, based on the statistics of fractional moments. The properties of long sequences of 3D videos are reduced to a very small set of fitting parameters, constituting the video “fingerprint”. The method is applied to a set of videos, with different compression degrees. Moreover, possible similarities among different fingerprints are investigated for an effective 3D video classificatio
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