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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of chemical information and modeling 35 (1995), S. 181-187 
    ISSN: 1520-5142
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The journal of supercomputing 15 (2000), S. 5-24 
    ISSN: 1573-0484
    Keywords: parallel architectures ; initialization ; linear arrays ; rings ; binary trees ; meshes ; tori ; meshes with broadcasting ; hypercubes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The incremental and dynamic construction of interconnection networks from smaller components often leaves the fundamental problem of assigning addresses to processors to be contended with at power-up time. The problem is fundamental, for virtually all parallel algorithms known to the authors assume that the processors know their global coordinates within the newly created entity. We refer to this problem as the initialization problem. Rather surprisingly, the initialization problem has not received much attention in the literature. Our main contribution is to present parallel algorithms for the initialization problem on a number of network topologies, including complete binary trees, meshes of trees, pyramids, linear arrays, rings, meshes, tori, higher dimensional meshes and tori, hypercubes, butterflies, linear arrays with a global bus, rings with a global bus and meshes with multiple broadcasting, under various assumptions about edge labels, leader existence, and a priori knowledge of the number of nodes in the network. With two exceptions, the proposed algorithms are optimal.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    BIT 30 (1990), S. 424-436 
    ISSN: 1572-9125
    Keywords: C.1 ; F.2 ; parallel algorithm ; linear array ; subsets ; equivalence relations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We describe a cost-optimal parallel algorithm for enumerating all partitions (equivalence relations) of the set {1, ...,n}, in lexicographic order. The algorithm is designed to be executed on a linear array of processors. It usesn processors, each having constant size memory and each being responsible for producing one element of a given set partition. Set partitions are generated with constant delay leading to anO(B n) time solution, whereB n is the total number of set partitions. The same method can be generalized to enumerate some other combinatorial objects such as variations. The algorithm can be made adaptive, i.e. to run on any prespecified number of processors. To illustrate the model of parallel computation, a simple case of enumerating subsets of the set {1, ...,n}, having at mostm (≤n) elements is also described.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    BIT 27 (1987), S. 18-24 
    ISSN: 1572-9125
    Keywords: 05B50 ; 05B45 ; 05A15 ; triangular polymino ; triangular system ; algorithm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Lunnon has defined a triangularp-mino as an edge-connected configuration ofp cells from the triangle plane grid with vertices of degree 6. A triangular system is a triangularp-mino without any holes. On the other hand we can say that a triangular system is a part of a triangular grid with vertices of degree 6, consisting of all edges and vertices of some closed broken lineC without intersections (a circuit in the triangle grid), and all edges and vertices in the interior ofC. It is obvious that any closed broken lineC without intersections uniquely determines a triangular system. In this paper a method of generating triangular systems is presented.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    BIT 28 (1988), S. 785-789 
    ISSN: 1572-9125
    Keywords: F.2 ; G.2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In a recent paper published in this journal, R. Chang and R. Lee purport to devise anO(N logN) time minimal spanning tree algorithm forN points in the plane that is based on a divide-and-conquer strategy using Voronoi diagrams. In this brief note, we present families of problem instances to show that the Chang-Lee worst-case timing analysis is incorrect, resulting in a time bound ofO(N 2 logN). Since it is known that alternate, trulyO(N logN) time algorithms are available anyway, the general utility of the Chang-Lee algorithm is questionable.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    International journal of parallel programming 18 (1989), S. 485-503 
    ISSN: 1573-7640
    Keywords: Prefix products ; parallel computation ; computational geometry, trees.Classifications: G.1.0. Parallel algorithms ; G.1.3.5 Computational geometry and object modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We introduce a generic problem component that captures the most common, difficult “kernel” of many problems. This kernel involves general prefix computations (GPC). GPC's lower bound complexity of Ω(n logn) time is established, and we give optimal solutions on the sequential model inO(n logn) time, on the CREW PRAM model inO(logn) time, on the BSR (broadcasting with selective reduction) model in constant time, and on mesh-connected computers inO(√n) time, all withn processors, plus anO(log2 n) time solution on the hypercube model. We show that GPC techniques can be applied to a wide variety of geometric (point set and tree) problems, including triangulation of point sets, two-set dominance counting, ECDF searching, finding two-and three-dimensional maximal points, the reconstruction of trees from their traversals, counting inversions in a permutation, and matching parentheses.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International journal of parallel programming 19 (1990), S. 213-224 
    ISSN: 1573-7640
    Keywords: Hypercube Algorithms ; Image Processing ; Parallel Algorithms ; Visibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Consider an×n binary image. Given a directionD, the parallel visibility problem consists of determining for each pixel of the image the portion that is visible (i.e., not obstructed by any other black pixel of the image) in directionD from infinity. A related problem, referred to as point visibility, is to compute for each pixel the portion that is visible from a given pointp. In this paper, we deriveO(logn) time SIMD algorithms for each of these two problems on the hypercube, where one processor is assigned to every pixel of the image. Since the worst case communication distance of two processors in an 2-processor hypercube is 2 logn, it follows that both of the above algorithms are asymptotically optimal.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mathematical imaging and vision 5 (1995), S. 119-127 
    ISSN: 1573-7683
    Keywords: BSR model ; digital geometry ; parallel computation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper we solve several geometric and image problems using the BSR (broadcasting with selective reduction) model of parallel computation. All of the solutions presented are constant time algorithms. The computational geometry problems are based on city block distance metrics: all nearest neighbors and furthest pairs ofm points in a plane are computed on a two criteria BSR withm processors, the all nearest foreign neighbors and the all furthest foreign pairs ofm points in the plane problems are solved on three criteria BSR withm processors while the area and perimeter ofm isooriented rectangles are found on a one criterion BSR withm 2 processors. The problems on ann ×n binary image which are solved here all use BSR withn 2 processors and include: histogramming (one criterion), distance transform (one criterion), medial axis transform (three criteria) and discrete Voronoi diagram of labeled images (two criteria).
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    International journal of parallel programming 21 (1992), S. 109-121 
    ISSN: 1573-7640
    Keywords: Algorithms ; computational geometry ; PRAMs ; parallel algorithms ; digital polygons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Given two finite sets of points in a plane, the polygon separation problem is to construct a separating convexk-gon with smallestk. In this paper, we present a parallel algorithm for the polygon separation problem. The algorithm runs inO(logn) time on a CREW PRAM withn processors, wheren is the number of points in the two given sets. The algorithm is cost-optimal, since Ω(n logn) is a lower-bound for the time needed by any sequential algorithm. We apply this algorithm to the problem of finding a convex polygon, with the minimal number of edges, for which a given convex region is its digital image. The algorithm in this paper constructs one such polygon with possibly two more edges than the minimal one.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-773X
    Keywords: learning ; multiple-valued multiple-threshold functions ; multilinear separability ; partial order set ; perceptrons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract The (n,k,s)-perceptrons partition the input space V ⊂ R n into s+1 regions using s parallel hyperplanes. Their learning abilities are examined in this research paper. The previously studied homogeneous (n,k,k−1)-perceptron learning algorithm is generalized to the permutably homogeneous (n,k,s)-perceptron learning algorithm with guaranteed convergence property. We also introduce a high capacity learning method that learns any permutably homogeneously separable k-valued function given as input.
    Type of Medium: Electronic Resource
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