1,721,067 research outputs found
Performance Analysis of SPSK with Dual Polarized Transmit Antennas over Rayleigh Fading Channel
No full textIn this paper, the Space Polarization Shift Keying (SPSK) system, which is an extended version of Space Shift Keying (SSK) and includes both space and polarization dimensions with dual polarized antennas, is studied. The capacity and error probability analysis of SPSK for different polarization configurations are dealt with over the Rayleigh fading channel with a rich scattering environment. The analysis conducted shows that the SPSK with a dual polarized antenna (DP) offers better results than SPSK with a single orthogonal polarized antenna SPSK(SP), under non-LOS conditions. SPSK(DP) outperforms SSK by 4.2 dB over the correlated Rayleigh fading channel at 3 bits/s/Hz.</jats:p
Pelaksanaan Sistem Pengurusan Sekolah Kualiti (SPSK) di Sekolah Rendah daerah Johor Bahru
Full text linkResearch was conducted to survey the implementation of the Sistem Pengurusan Sekolah Kualiti (SPSK) in Johor Bahru primary schools in terms of level of knowledge and practice of teachers as well as comparison of implementation based on gender. There are 162 survey responses received from teachers who represent the population of 277 teachers in five primary schools. Questionnaire containing 48 items based on the quality model Clarence Burns (1997) and six working procedures of the SPSK. Descriptive statistical techniques and inferential statistical techniques such as mean, frequency, Pearson correlation, t-test and oneway Anova test was used to achieve the research objectives. Three hypotheses were tested at the confidence level P <0.05. As a result of this research has rejected two of the three null hypotheses. Survey results found that the level of knowledge and practice of teachers in this district in implementing the SPSK are high and the level of practice is higher than the level of knowledge. Through t-test, shows that female teachers level of knowledge and practice are higher than male teachers. Hypothesis test results also showed that there were significant differences in level of knowledge between male and female teachers, but there was no significant difference in the level of practice. One way Anova test in this study explain the existence of highly significant differences in the level of implementation of the SPSK between schools of different types and categories further reject the null hypothesis. High Performance Schools is a school of the highest level of implementation in the SPSK followed by Cluster School and three other daily schools. Important implication of this study was gender and different types of school factors play a role in ensuring the implementation of Sistem Pengurusan Sekolah Kualiti (SPSK) in primary schools can be well implemented and achieved quality objectives. Finally some action proposals were made to improve the quality of the implementation of this system at other schools that have not yet implementing SPSK
Performance Analysis of SPSK with Dual Polarized Transmit Antennas over Rayleigh Fading Channel, Journal of Telecommunications and Information Technology, 2018, nr 1
Full text linkIn this paper, the Space Polarization Shift Keying (SPSK) system, which is an extended version of Space Shift Keying (SSK) and includes both space and polarization dimensions with dual polarized antennas, is studied. The capacity and error probability analysis of SPSK for different polarization configurations are dealt with over the Rayleigh fading channel with a rich scattering environment. The analysis conducted shows that the SPSK with a dual polarized antenna (DP) offers better results than SPSK with a single orthogonal polarized antenna SPSK(SP), under non-LOS conditions. SPSK(DP) outperforms SSK by 4.2 dB over the correlated Rayleigh fading channel at 3 bits/s/Hz
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
- …
