1,720,964 research outputs found
ALPHA-KERNEL PROBLEM WITH FUZZY VISIBILITY
No full textThis paper proposes a new visibility concept,fuzzy visibility reflecting that the visibility property varies according to the condition of application areas. The concept of alpha-visibility is defined on the basis of the fuzzy theory. For two points p and q, p is alpha-visible from q if the visibility degree between them is no less than alpha is an element of [0,1]. If there exists a point from which all points in a polygon are alpha-visible, then it is said that the visibility value of the polygon is alpha. The alpha-kernel problem is constructing the region such that ail points inside simple polygon can be alpha-visible from any point of the region. An optimal algorithm is given for the alpha-kernel problem with O(n) time complexity. For a given simple polygon we present O(n) algorithms for computing the maximum and minimum visibility values of the polygon
Multiple point visibility and related problems
No full textIf a point p is visible from m distinct points, the point p is said to be m-visible. For a simple polygonal shape art gallery P, it is shown that the minimum number of guards required for P to be in-visible is either 2(m - 1) + 1 or 3(m - 1) + 1 if P is a star-shaped polygon with the property that P is visible from only a boundary point. For any simple polygon with n vertices, it is also shown that the [n/3] x m guards are occasionally necessary and always sufficient. The algorithms to locate the determined guards on the given gallery (or polygon) are also presented
Hierarchical partition of nonstructured concurrent systems
No full textIn this paper, the concepts of structured and nonstructured concurrency are introduced to classify concurrent systems, and a hierarchical partition method is used to handle the complexity of nonstructured concurrent systems. A concurrent system with structured and nonstructured concurrency is modelled by a precedence graph. The language of the precedence graph is defined, and a representation method of the language is developed, By decomposing the language hierarchically, hierarchical partitions of the concurrent system can be obtained. From the partitions, a concurrent system can be reduced hierarchically
Design and implementation of a fuzzy elevator group control system
No full textElevator group control systems (EGCS's) are the control systems that systematically manage three or more elevators in order to efficiently transport passengers. Most EGCS's have used the hall call assignment method to assign elevators in response to passengers' calls. This paper proposes a control strategy generation method, a hall call assignment method based on the fuzzy theory, and then the fuzzy elevator group control system (FEGCS). The control strategy of FEGCS is made using the classification of the passenger traffic and system manager's requirements, and the hall calls are assigned to suitable elevators by the generated control strategy. The system is operated using the given control strategy which is defined by the system manager. The proposed system shows better results than the conventional methods in simulations and is under commercialization by an industrial company
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
A Fuzzy Approach to Elevator Group Control-System
No full textThe elevator group control systems are the control systems that manage systematically, three or more elevators in order to efficiently transport the passengers. In the elevator group control system, the area-weight which determines the load biases of elevators is a control parameter closely related to the system performance. This correspondence proposes a fuzzy model based method to determine the area-weight. The proposed method uses a two-stage fuzzy inference model which is built by the study of area-weight properties and expert knowledge. The proposed method shows more desirable results than the conventional method in simulations that use real traffic data
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
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