1,720,965 research outputs found
DETECTION OF COMPOSITE SIGNALS .2. EXAMPLES AND PERFORMANCE COMPARISON
No full textExamples of the locally optimum detection scheme for weak composite signals are shown for some well-known probability density functions. Asymptotic performance and finite sample-size performance characteristics of the locally optimum detectors are compared to those of other common detectors.Korea Science and Engineering Foundation (KOSEF) under Grant 893-0801-011-
PERFORMANCE-CHARACTERISTICS OF THE FUZZY SIGN DETECTOR
No full textIn this paper, fuzzy statistical techniques are introduced into the optimum signal detection problems. The likelihood ratio for fuzzy detection of known signals is obtained, As a special case of the fuzzy signal detector, a fuzzy set theoretic approach to sign detection of known signals is considered, Specifically, the test statistic of the fuzzy sign detector for known signals is obtained. Some properties of the fuzzy sign nonlinearity, which constitutes the fuzzy sign detector, are also described, Finally, the performance characteristics of the fuzzy sign detector are investigated and compared to those of the crisp sign detector.Non-Directed Research Fund, Korea Research Foundation
DETECTION OF COMPOSITE SIGNALS .1. LOCALLY OPTIMUM DETECTOR TEST STATISTICS
No full textTest statistics of the locally optimum detection schemes for weak composite signals having both deterministic and stochastic signal components are derived for the purely-additive noise model. The locally optimum detectors are compared to those for deterministic-signal-only model and those for random-signal-only model. Structures of the locally optimum detectors are also described.Korea Science and Engineering Foundation (KOSEF) under Grant 893-0801-011-
A FUZZY DECISION PROBLEM BASED ON THE GENERALIZED NEYMAN-PEARSON CRITERION
No full textA reformulation of the generalized Neyman-Pearson lemma is attempted using fuzzy set theory. Based on the result, we define a locally optimum (or locally most powerful) fuzzy test and derive the locally optimum fuzzy test function. As a practical application of the locally optimum fuzzy test, detection of weak deterministic signals corrupted by purely-additive noise is considered, which is an important problem in statistical signal processing. Comparisons between the locally optimum and the locally optimum fuzzy tests are also made in the example.Korea Science and Engineering Foundation (KOSEF) under Grant 893-0801-011-2 and Korea Advanced Institute of Science and Technology (KAIST) under an Internal Gran
STATISTICAL CHARACTERISTICS AND PERFORMANCE ANALYSIS OF LOCALLY OPTIMUM FUZZY DETECTOR FOR KNOWN SIGNALS
No full textIn this paper statistical characteristics of the locally optimum fuzzy detector test statistic for known signals are discussed. More specifically, the probability distribution of the locally optimum fuzzy detector test statistic is obtained from the exact and approximate approaches. In addition, performance characteristics of the locally optimum fuzzy detector are considered through computer simulation, and compared to those of the locally optimum detector. Finally we discuss the basic functional characteristics of the locally optimum fuzzy detector.Korea Science and Engineering Foundation (KOSEF) under Grant 921-0800-002-2 and Korea Advanced Institute of Science and Technology (KAIST) under an Internal Gran
AN APPLICATION OF THE GENERALIZED NEYMAN-PEARSON FUZZY TEST TO STOCHASTIC-SIGNAL DETECTION
No full textIn the article an application of the fuzzy testing of hypothesis to the stochastic-signal detection problem is considered when the signal-to-noise ratio approaches zero. We first obtain the general relationship between the test statistic of the locally optimum fuzzy detector and that of the locally optimum detector. Based on this result, the test statistic and structures of the locally optimum fuzzy detector for stochastic signals are obtained. Several aspects of the locally optimum fuzzy nonlinearity for stochastic signals are also described. Finally, performance characteristics of the locally optimum fuzzy detector are briefly discussed.Korea Science and Engineering Foundation (KOSEF) under Grant 921-0800-002-
A FUZZY SET THEORETIC APPROACH TO WEAK KNOWN-SIGNAL DETECTION
No full textIn this paper locally optimum detection of known signals is considered when the observations provide us with fuzzy information, and a useful expression of the test statistic of the locally optimum fuzzy detector for known signals is obtained. The structure of the locally optimum fuzzy detector is obtained and compared to that of the classical (crisp) locally optimum detector. Several properties of the locally optimum fuzzy nonlinearity, which constitutes the locally optimum fuzzy detector, are also described
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
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