1,720,987 research outputs found
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
Fiber optic sensors-based thermal analysis of perfusion-mediated tissue cooling in liver undergoing laser ablation
Full text linkThe current challenge in the field of thermo-ablative treatments of tumors is to achieve a balance between complete destruction of malignant cells and safeguarding of the surrounding healthy tissue. Blood perfusion plays a key role for thermal ablation success, especially in the case of highly vascularized organs like liver. This work aims at monitoring the temperature within perfused swine liver undergoing laser ablation (LA). Temperature was measured through seven arrays of Fiber Bragg Grating sensors (FBGs) around the laser applicator. To mimic reality, blood perfusion within the ex-vivo liver was simulated using artificial vessels. The influence of blood perfusion on LA was carried out by comparing the temperature profiles in two different spatial configurations of vessels and fibers. The proposed setup permitted to accurately measure the heat propagation in real-time with a temperature resolution of 0.1 °C and to observe a relevant tissue cooling near to the vessel up to 65%
Long period gratings in unconventional optical fibers made with 3D-printed periodic interdigitated grooved structure
No full textThis work outlines the analysis and implementation of mechanically induced long-period gratings (MILPGs) in both conventional and non-traditional optical fibers, encompassing standard single-mode fiber (SMF-28), double-cladding fibers such as Thorlabs DCF-13 and Nufern S-1310, and a P-doped fiber. The fabrication of grating involves the application of transverse pressure to specially grooved plates, inducing periodic alterations in fiber structure and refractive index (RI). An innovative aspect in the proposed fabrication process is the use of stereolithography (SLA) 3D printing technique to create interdigitated, nearly sinusoidal-shaped grooved structure. Through this approach, we evaluated the performance of the MILPGs in order to comprehend how weight, grating length and fiber coating influence the effectiveness of MILPG. The characterizations were performed within wavelength range of 1100-1700 nm. The resulting devices showcase superior spectral characteristics, including negligible power losses and well-defined narrow attenuation bands. Notably, the proposed fabrication method stands out for its cost-effectiveness, it is easy-to-use and capable of rapid production. As a wide range of optical fibers have been explored in this work, each of which possesses unique geometrical and optical characteristics and this comprehensive exploration of fabrication parameters opens avenues for applying these devices in sensing and communication, marking the first comprehensive investigation of MILPGs in these specific optical fibers, thereby making a distinctive and innovative contribution to the field
Heart rate monitoring and cardiovascular stiffness estimation with Fiber Bragg Grating sensors embedded in soft patches
No full textThe impact that cardiovascular diseases (CVDs) have on the population puts the scientific community in a state of strong concern. CVDs represent, in fact, the main cause of deaths in the adult population worldwide. Among the main cardiovascular diseases, we find ischemic cardiomyopathy, ischemic stroke, myocardial infarction and peripheral vascular pathologies. The increase in deaths caused by cardiovascular diseases is constantly increasing, thus demanding for improved early diagnosis that can both limit the number of deaths per year and reduce the economic engagement related to the healthcare. In this context, here, to support timely diagnosis, we propose a minimally invasive sensor, based on Fiber Bragg Grating (FBG), embedded in a soft silicone patch to increase its pressure sensitivity. The proposed sensor is able to monitor the heart rate, and, from the second derivative of the processed signal, it is possible to get important information about cardiovascular stiffness
Plethysmography of peripheral artery using Fiber Bragg Grating sensors: preliminary results
No full textAppropriate 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
Fiber Bragg Grating Embedded in Soft Patch for Finger Tapping Assessment
No full textFinger tapping assessment helps clinicians to evaluate the upper limb motor function and motor impairment in patients with neurodegenerative diseases like Parkinson's and Alzheimer's. This paper proposes a finger tapping sensor based on the embedding of fiber Bragg grating (FBG) sensors in soft compounds. The embedding procedure demonstrates to enhance the sensitivity of the FBG to the finger pressure and, at the same time, provides flexibility and protection to the sensing element. The proposed device seeks to be a novel non-invasive alternative solution to the sensing systems reported in literature, often complex and bulky, and to support the current clinical assessment, usually qualitative and performed visually. The patch has been tested on four healthy subjects carrying out three kinds of task, i.e., random, rhythmic, and fast index finger tapping, each one executed for 20 seconds and by using both hands, one at a time. The proposed sensor proves to be able to record the temporal evolution of the tapping signals and allows to discriminate the tapping waveform between the different involved subjects and performed tasks, enabling comparative analyses among them. © 2023 IEEE
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