1,721,472 research outputs found
Error repair with validation in LR-based parsing
No full textWhen the compiler encounters an error symbol in an erroneous input, the local error-repair method repairs the input by either inserting a repair string before the error symbol or deleting the error symbol, Although the extended FMQ of Fischer et al. and the method of McKenzie et al. report the improved quality of diagnostic messages, they suffer from redundant parse stack configurations. This article proposes an efficient LR error-recovery method, with validation-removing repairs that give the same validation result as a previously considered, lower-cost repair. Moreover, its execution speed is proportional to the length of the stack configuration. The algorithm is implemented on a Bison, GNU LALR(1), parser generating system. Experimental results are presented
New maximum power point tracker using sliding-mode observer for estimation of solar array current in the grid-connected photovoltaic system
No full textA new maximum power point tracker (MPPT) for a grid-connected photovoltaic system without solar array current sensor is proposed. The solar array current information is obtained from the sliding-mode observer and fed into the MPPT to generate the reference voltage. The parameter values such as capacitances can be changed up to 50% from their nominal values, and the linear observer cannot estimate the correct state values under the. parameter variations and noisy environments. The structure of a sliding-mode observer is simple, but it shows the robust tracking property against modeling uncertainties and parameter variations. In this paper, the sliding-mode observer for the solar array current has been proposed to compensate for the parameter variations. The mathematical modeling and the experimental results verify the validity of the proposed method
Role of Syndecan-4 in the cellular invasion of Orientia tsutsugamushi
No full textCell surface heparan sulfate proteoglycans (HSPGs) play a critical role in the cellular invasion of intracellular bacteria and are presumed to have a role in the infection of host cells by Orientia tsutsugamushi. Previously, we showed that O. tsutsugamushi infection decreased markedly after treating host cells with heparinase, which suggests that HSPGs play an important role in oriential infection. We tested oriential infection in REF-Syn4 cells over-expressing syndecan-4, and in REF-Syn4AS cells in which the expression of syndecan-4 was down regulated by transfecting with anti-sense syndecan-4 cDNA. Oriential infection was found to be dependent on the expression level of syndecan-4 on the cell surface. Furthermore, the infectivity of O. tsutsugamushi was specifically reduced by treating O. tsutsugamushi with the purified recombinant core protein of syndecan-4 (Syn4E). These results suggest that the core protein of syndecan-4 and the heparin/heparan sulfate chain of syndecan play an important role in oriential infection by O. tsutsugamushi. (C) 2004 Elsevier Ltd. All rights reserved.N
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
Microstructure control of YMnO3 thin films on Si (100) substrates
No full textThe microstructure of the sputtered-YMnO3, thin films on Si (100) substrates was controlled by only using thermal treatment processes and YMnO3 thin films having a well-defined bi-layered microstructure were fabricated. These YMnO3 thin films have two distinct layers, i.e. approximately 40 nm-thick top layer of {00l}-oriented YMnO3, and approximately 60 nm-thick bottom layer of polycrystalline YMnO3 in the 100 rim-thick film. The abrupt change of the crystalline orientation from the {00l}-preferred orientation to the random orientation is mainly due to a high stress induced by die {00l}-oriented YMnO3 layer, which was confirmed by a full width at half-maximum in Si (004) rocking curves. The controlled c-axis/polycrystalline YMnO3 thin films showed a better memory window and low leakage current density than purely c-axis-oriented YMnO3 thin film and the purely polycrystalline YMnO3 thin film. (C) 2002 Elsevier Science B.V. All rights reserved
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