1,722,810 research outputs found
World cities in the process of globalisation - challenges for Berlin
Full text linkWORLD CITIES IN THE PROCESS OF GLOBALISATION - CHALLENGES FOR BERLIN
World cities in the process of globalisation - challenges for Berlin / Hall, Peter (Rights reserved) (-
On the Minimization of Lp Error in Mode Estimation
Full text link1 online resource (PDF, 25 pages)Grund, Birgit; Hall, Peter. (1993). On the Minimization of Lp Error in Mode Estimation. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/199613
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
Loss and Risk in Smoothing Parameter Selection
Full text link1 online resource (PDF, 43 pages)Grund, Birgit; Hall, Peter; Marron, J. S.. (1992). Loss and Risk in Smoothing Parameter Selection. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/199604
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
Optimizing for efficiency or battery life in a battery/supercapacitor electric vehicle
No full textA novel energy control strategy for a battery/supercapacitor vehicle, which is designed to be tunable to achieve different goals, is described. Two possible goals for adding a pack of supercapacitors are examined for a test vehicle using lead-acid batteries: 1) improving the vehicle's efficiency and range and 2) reducing the peak currents in the battery pack to increase battery life. The benefits of hybridization are compared with those achievable by increasing the size of the battery pack by a comparable mass to the supercapacitors. The availability of energy from regenerative braking and the characteristics of the supercapacitors are considered as impact factors. Supercapacitors were found to be effective at reducing peak battery currents; however, the benefits to range extension were found to be limited. A battery life extension of at least 50% is necessary to make supercapacitors cost effective for the test vehicle at current prices
Methods For Tracking Support Boundaries with Corners
No full textIn a range of practical problems the boundary of the support of a
bivariate distribution is of interest, for example where it describes a limit to e±-
ciency or performance, or where it determines the physical extremities of a spatially
distributed population in forestry, marine science, medicine, meteorology or geol-
ogy. We suggest a tracking-based method for estimating a support boundary when
it is composed of a ¯nite number of smooth curves, meeting together at corners.
The smooth parts of the boundary are assumed to have continuously turning tan-
gents & bounded curvature, & the corners are not allowed to be in¯nitely sharp;
that is, the angle between the two tangents should not equal ¼. In other respects,
however, the boundary may be quite general. In particular it need not be uniquely
de¯ned in Cartesian coordinates, its corners my be either concave or convex, and
its smooth parts may be neither concave nor convex. Tracking methods are well
suited to such generalities, & they also have the advantage of requiring relatively
small amounts of computation. It is shown that they achieve optimal convergence
rates, in the sense of uniform approximation
MIMO stochastic model and capacity evaluation of on-body channels
No full textThe improvement in terms of channel capacity provided by using a MIMO antenna system in personal area networks is investigated. Two on-body channel models derived in the 2.45 GHz frequency band are also presented and applied to two on-body links. The first proposed model uses, for each spatial subchannel, the same average values for the Rician factor, received power, and shadowing deviation. The second model encompasses the polarization loss in the on-body channels by utilizing different values of these parameters per each spatial subchannel. Furthermore, the joint correlation matrix is used instead of the classical Kronecker product. It is shown that the second model results in a better agreement of the achievable capacity with the measured channel. Also, the equal power and waterfilling power allocation schemes are compared in such on-body channels and it is shown that, adopting waterfilling instead of the equal power provides a higher capacity in the low SNR range while yielding the same achievable capacity in high SNR
- …
