87,155 research outputs found
Utilizing SVMs to derive psychophysiological information from a Brain-Computer Interfacing study
No full textKaper M, Meinicke P, Ritter H. Utilizing SVMs to derive psychophysiological information from a Brain-Computer Interfacing study. In: Schmalhofer F, Young RM, Katz G, eds. Proceedings of EuroCogSci 03. Mahwah: Erlbaum; 2003: 404
Improving Transfer Rates in Brain Computer Interfacing: a Case Study
No full textMeinicke P, Kaper M, Hoppe F, Heumann M, Ritter H. Improving Transfer Rates in Brain Computer Interfacing: a Case Study. In: Becker S, Thrun S, Obermayer K, eds. Advances in Neural Information Processing Systems 15. Cambridge, MA: MIT Press; 2003: 1131
Boundary Layers
No full text1 1 Boundary-Layer Behavior 1 2 Extension Theorems 5 3 Regularization 8 4 Matching Asymptotic Approximations 16 Index 20 iv ASYMPTOTIC ANALYSIS Working Note #3 BOUNDARY LAYERS by Marc Garbey and Hans G. Kaper Abstract In this chapter we discuss the asymptotic approximation of functions that display boundary-layer behavior. Our purpose here is to introduce the basic concepts underlying the phenomenon, to illustrate its importance, and to describe some of the fundamental tools available for its analysis. To achieve our purpose in the clearest way possible, we shall work with functions that are assumed to be given explicitly---that is, functions f : (0; ffl 0 ) ! X whose expressions are known, at least in principle. Only in the following chapter shall we begin the study of functions that are given implicitly as solutions of boundary value problems---the real stuff of which singular perturbation theory is made. Boundary-layer behavior is associated with asymptotic expansions that are..
Variations on the Author
No full text“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
Using Maximum Contrast Classifiers for EEG data analysis
No full textMeinicke P, Kaper M, Weiss S, Müller HM, Ritter H. Using Maximum Contrast Classifiers for EEG data analysis. In: Schmalhofer F, Young RM, Katz G, eds. Proceedings of EuroCogSci 03. Mahwah, NJ: Erlbaum; 2003: 417
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
On the absence of wind bow-shocks around OB-runaway stars: Probing the physical conditions of the interstellar medium
No full textHigh-resolution IRAS maps are used to search for the
presence of stellar-wind bow-shocks around high-mass X-ray binaries
(HMXBs). Their high space velocities, recently confirmed with Hipparcos observations, combined with their strong stellar winds
should result in the formation of wind bow-shocks. Except for the
already known bow-shock around Vela X-1 (Kaper et al. [CITE]),
we do not find convincing evidence for a bow-shock around any of the
other HMXBs. Also in the case of (supposedly single) OB-runaway stars,
only a minority appears to be associated with a bow-shock (Van Buren
et al. [CITE]). We investigate why wind bow-shocks are
not detected for the majority of these OB-runaway systems: is this due
to the IRAS sensitivity, the system's space velocity, the stellar-wind
properties, or the height above the galactic plane? It turns out that
none of these suggested causes can explain the low detection rate
(~40%). We propose that the conditions of the interstellar
medium mainly determine whether a wind bow-shock is formed or not. In
hot, tenuous media (like inside galactic superbubbles) the sound speed
is high (~100 km s-1), such that many runaways move at subsonic
velocity through a low-density medium, thus preventing the formation
of an observable bow-shock. Superbubbles are expected (and observed)
around OB associations, where the OB-runaway stars were once
born. Turning the argument around, we use the absence (or presence) of
wind bow-shocks around OB runaways to probe the physical conditions of
the interstellar medium in the solar neighbourhood
Logarithmic variance profiles and the corresponding f-1 spectra of temperature fluctuations in turbulent Rayleigh-Bénard convection
No full textWe report experimental results for the temperature variance 2(z) and the corresponding frequency spectra P(f) in turbulent Rayleigh-Bénard convection (RBC) in a cylindrical sample of aspect ratioT= D/L = 1:00 (D = 1:12 m is the diameter and L = 1:12 m the height). The measurements were conducted in the Rayleigh-number range 1011 < Ra < 1:35 1014 and Pr ' 0:8. For Ra = 1:35x1014, 2(z) could be described well by a logarithmic dependence on the vertical position z in a range of z 1 < z < z 2 with z 1 ' 70 and z 2 = 0:1L. Here L=(2Nu) is the thickness of a thin thermal sublayer adjacent to the horizontal plate where the heat flux (denoted by the Nusselt number Nu) is carried mostly by thermal diffusion. In the log layer, we found that the temperature spectra had a significant frequency range over which P(f) f with close to 1. As Ra decreased, increased so that the log layer became thinner. At Ra = 2:05 1011, z 2 < z 1 and therefore there was no range for a log layer. Correspondingly, the temperature spectrum near the horizontal plate did not have the f1 scaling form either
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