1,728,665 research outputs found
Singh (R. John) : French diplomacy in the Caribbean and the American Révolution
No full textMcCusker John J. Singh (R. John) : French diplomacy in the Caribbean and the American Révolution. In: Revue française d'histoire d'outre-mer, tome 65, n°239, 2e trimestre 1978. p. 295
Meter placement for distribution system state estimation: An ordinal optimization approach
No full textThis paper addresses the problem of meter placement for distribution system state estimation (DSSE). The approach taken is to seek a set of meter locations that minimizes the probability that the peak value of the relative errors in voltage magnitudes and angle estimates across the network exceeds a specified threshold. The proposed technique is based on ordinal optimization and employs exact calculations of the probabilities involved, rather than estimates of these probabilities as used in our earlier work. The use of ordinal optimization leads to a decrease in computational effort without compromising the quality of the solution. The benefits of the approach in terms of reduced estimation errors is illustrated by simulations involving a 95-bus UKGDS distribution network model. © 2006 IEEE.Abur A., 2004, POWER SYSTEM STATE E; [Anonymous], MATLAB STAT TOOLBOX; Gou B, 2001, IEEE T POWER SYST, V16, P819; HO YC, 1994, IEEE T AUTOMAT CONTR, V39, P1025; Ho Y.-C., 2007, ORDINAL OPTIMIZATION; Jabr RA, 2009, IET GENER TRANSM DIS, V3, P713, DOI 10.1049-iet-gtd.2009.0019; Lau TWE, 1997, J OPTIMIZ THEORY APP, V93, P455, DOI 10.1023-A:1022614327007; Lewis F. L., 1986, OPTIMAL ESTIMATION; Li K, 1996, IEEE T POWER SYST, V11, P911; MONTICELLI A, 1985, IEEE T POWER AP SYST, V104, P1035, DOI 10.1109-TPAS.1985.323453; Rakpenthai C, 2007, IEEE T POWER DELIVER, V22, P101, DOI 10.1109-TPWRD.2006.881425; Singh R, 2009, IEEE T POWER SYST, V24, P668, DOI 10.1109-TPWRS.2009.2016457; Singh R, 2009, IET GENER TRANSM DIS, V3, P666, DOI 10.1049-iet-gtd.2008.0485; UK Generic Distribution System, UK GENERIC DISTRIBUT; Wang HB, 2004, IEEE T POWER SYST, V19, P207, DOI 10.1109-TPWRS.2003.8214261712
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
Distribution system state estimation through Gaussian mixture model of the load as pseudo-measurement
No full textThis study presents an approach to utilise the loads as pseudo-measurements for the purpose of distribution system state estimation (DSSE). The load probability density function (pdf) in the distribution network shows a number of variations at different nodes and cannot be represented by any specific distribution. The approach presented in this study represents all the load pdfs through the Gaussian mixture model (GMM). The expectation maximisation (EM) algorithm is used to obtain the parameters of the mixture components. The standard weighted least squares (WLS) algorithm utilises these load models as pseudo-measurements. The effectiveness of WLS is assessed through some statistical measures such as bias, consistency and quality of the estimates in a 95-bus generic distribution network model. © 2009 © The Institution of Engineering and Technology.Abur A., 2004, POWER SYSTEM STATE E; ANDERSON TW, 1966, INTRO MULTIVARIATE S; [Anonymous], MATLAB STAT TOOLBOX; BARAN ME, 1995, IEEE T POWER SYST, V10, P483, DOI 10.1109-59.373974; BILMES J.A., 1998, ICSITR97021; Blackman S.S., 1986, MULTIPLE TARGET TRAC; Celik M. K., 1999, P IEEE PES 1999 WINT, V1, P442; DEMPSTER AP, 1977, J ROY STAT SOC B MET, V39, P1; FREEDMAN D, 1981, Z WAHRSCHEINLICHKEIT, V57, P453, DOI 10.1007-BF01025868; Gauvrit H, 1997, IEEE T AERO ELEC SYS, V33, P1242, DOI 10.1109-7.625121; Ghosh AK, 1997, IEEE T POWER SYST, V12, P45, DOI 10.1109-59.574922; Jabr RA, 2004, IEE P-GENER TRANSM D, V151, P103, DOI 10.1049-ip-gtd:20040030; Kehtarnavaz N, 1998, PATTERN RECOGN LETT, V19, P133, DOI 10.1016-S0167-8655(97)00173-6; Lewis F. L., 1986, OPTIMAL ESTIMATION; Li K, 1996, IEEE T POWER SYST, V11, P911; Lin WM, 1996, IEE P-GENER TRANSM D, V143, P43, DOI 10.1049-ip-gtd:19960049; LU CN, 1995, IEEE T POWER SYST, V10, P229, DOI 10.1109-59.373946; Lubkeman DL, 2000, IEEE T POWER DELIVER, V15, P399, DOI 10.1109-61.847280; Mardia K. V., 1979, MULTIVARIATE ANAL; MCLACHLAN GJ, 1988, MIXTURE MODELS INTER; REDNER RA, 1984, SIAM REV, V26, P195, DOI 10.1137-1026034; ROYTELMAN I, 1993, IEEE T POWER DELIVER, V8, P2009, DOI 10.1109-61.248315; Salmond D. J., 1988, 88004 ROYAL AER EST; Seppala A., 1995, P INT C EMPD NOV 21, V2, P696, DOI 10.1109-EMPD.1995.500813; Silverman B.W., 1986, DENSITY ESTIMATION S; Singh R, 2009, IEEE T POWER SYST, V24, P668, DOI 10.1109-TPWRS.2009.2016457; Singh R, 2009, IET GENER TRANSM DIS, V3, P666, DOI 10.1049-iet-gtd.2008.0485; Wang YW, 2004, J INORG MATER, V19, P129201
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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