1,720,953 research outputs found
Sigmoid Neural Transfer Function Realised by Percolation
No full textAn experiment using the phenomenon of percolation has been conducted to demonstrate the implementation of neural functionality (summing and sigmoid transfer). A simple analog approximation to digital percolation is implemented. The device consists of a piece of amorphous silicon with stochastic bit-stream optical inputs, in which a current percolating from one end to the other defines the neuron output, also in the form of a stochastic bit stream. Preliminary experimental results are presented
A comparison of the electronic behaviour of In_0_._5_3Ga_0_._4_7As interfaces formed with directly and remotely PELVD silicon nitride
No full textCommunication requirements are constantly increasing both in terms of volume and speed. The compound ln_xGa_1_-_xAs is ideal for optoelectronic and microwave applications. It is direct bandgap and high speed with low field mobilities of the order of 12 000 cm"2V"-"1s"-"1 and an electron drift velocity of 2.8x10"7 cm s"-"1. In_0_._5_3Ga_0_._4_7As has a bandgap that is ideal for optical wavelengths in the low loss window of optical fibres and is lattice matched to InP which leads to a reduction in parasitic capacitances. However the unpassivated InGaAs surface has a high interface state density which leads to current leakage and drift, and pinning of the surface Fermi level. MIS devices were fabricated in order to assess the differences between an industrial silicon nitride direct Plasma Enhanced Chemical Vapour Deposition (DPECVD) method and a low damage Remote PECVD deposition. The semiconductor-insulator interface was investigated using Capacitance/Conductance Voltage (CGV) measurements. Admittance Spectroscopy (AS), Deep Level Transient Spectroscopy (DLTS) and Optoelectronic Modulation Spectroscopy (OEMS). Through the combination of AS and OEMS measurements the applied voltage at which the devices achieved inversion was accurately obtained. The DLTS measurements were energy resolved and interface states were observed in both DPECVD and RPECVD devices in the lower half of the bandgap. The surfaces of the DPECVD devices were in majority accumulation at zero bias and the interface states communicated directly with the conduction band in reverse bias. On the other hand RPECVD devices were almost at flatband at zero bias and demonstrated greater Fermi level movement over the same voltage range. Investigation of the interface states indicated a higher density of states and more complicated behaviour including a lattice relaxation mechanism and tunnelling with the interface states communicating principally with the valence band. The two types of deposition gave rise to interfaces that exhibited very different behaviour. (author)Available from British Library Document Supply Centre-DSC:DXN051490 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
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
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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