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4,344
Approximation Algorithms for Projective Clustering
- Proceedings of the ACM SIGMOD International Conference on Management of data, Philadelphia
, 2000
"... We consider the following two instances of the projective clustering problem: Given a set S of n points in R d and an integer k ? 0; cover S by k hyper-strips (resp. hyper-cylinders) so that the maximum width of a hyper-strip (resp., the maximum diameter of a hyper-cylinder) is minimized. Let w ..."
Abstract
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Cited by 302 (22 self)
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be the smallest value so that S can be covered by k hyper-strips (resp. hyper-cylinders), each of width (resp. diameter) at most w : In the plane, the two problems are equivalent. It is NP-Hard to compute k planar strips of width even at most Cw ; for any constant C ? 0 [50]. This paper contains four main
Global and regional climate changes due to black carbon,
- Nat. Geosci.,
, 2008
"... Figure 1: Global distribution of BC sources and radiative forcing. a, BC emission strength in tons per year from a study by Bond et al. Full size image (42 KB) Review Nature Geoscience 1, 221 -227 (2008 Black carbon in soot is the dominant absorber of visible solar radiation in the atmosphere. Ant ..."
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Cited by 228 (5 self)
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of the warmer air heated by BC from South and East Asia over the Himalayas contributes to a warming of about 0.6 °C (annual mean) in the lower and mid troposphere (see http://www.nature.com/ngeo/journal/v1/n4/full/ngeo156.html 3 of 10 9/22/2009 9:43 AM The values are annual mean temperature changes over
Model evaluation guidelines for systematic quantification of accuracy in watershed simulations
, 2007
"... Watershed models are powerful tools for simulating the effect of watershed processes and management on soil and water resources. However, no comprehensive guidance is available to facilitate model evaluation in terms of the accuracy of simulated data compared to measured flow and constituent values ..."
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Cited by 179 (8 self)
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performance ratings were established for each recommended statistic. In general, model simulation can be judged as satisfactory if NSE> 0.50 and RSR < 0.70, and if PBIAS 25 % for streamflow, PBIAS 55 % for sediment, and PBIAS 70 % for N and P. For PBIAS, constituent-specific performance ratings were
Self-determination and persistence in a real-life setting: Toward a motivational model of high school dropout.
- Journal of Personality and Social Psychology,
, 1997
"... The purpose of this study was to propose and test a motivational model of high school dropout. The model posits that teachers, parents, and the school administration's behaviors toward students influence students' perceptions of competence and autonomy. The less autonomy supportive the so ..."
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Cited by 183 (19 self)
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intentions to drop out of high school, which are later implemented, leading to actual dropout behavior. This model was tested with high school students (N = 4,537) by means of a prospective design. Results from analyses of variance and a structural equation modeling analysis (with L1SREL) were found
Multi-dimensional range queries in sensor networks
- in Proc. of the 1st international conference on Embedded networked sensor systems, SenSys
"... In many sensor networks, data or events are named by attributes. Many of these attributes have scalar values, so one natural way to query events of interest is to use a multidimensional range query. An example is: “List all events whose temperature lies between 50 ◦ and 60 ◦ , and whose light levels ..."
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Cited by 152 (15 self)
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In many sensor networks, data or events are named by attributes. Many of these attributes have scalar values, so one natural way to query events of interest is to use a multidimensional range query. An example is: “List all events whose temperature lies between 50 ◦ and 60 ◦ , and whose light
An improved algorithm for computing the singular value decomposition
- ACM Trans. Math. Software
, 1982
"... The most well-known and widely used algorithm for computing the Singular Value Decomposition (SVD) A--- U ~V T of an m x n rectangular matrix A is the Golub-Reinsch algorithm (GR-SVD). In this paper, an improved version of the original GR-SVD algorithm is presented. The new algorithm works best for ..."
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Cited by 57 (0 self)
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The most well-known and widely used algorithm for computing the Singular Value Decomposition (SVD) A--- U ~V T of an m x n rectangular matrix A is the Golub-Reinsch algorithm (GR-SVD). In this paper, an improved version of the original GR-SVD algorithm is presented. The new algorithm works best
N=82 shell quenching below 132 50Sn50
"... The influence of nuclar structure on the r-process nucleosynthesis can best be studied within the ”waiting-point” concept [1]. Within this framework, the successful reproduction of the global isotopic abundances (Nr,⊙) aswellas remaining deficiencies have been interpreted by our group as signatures ..."
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of nuclear structure near the neutron dripline [1]. Pronounced abundance troughs prior to the Nr,⊙ peaks at A≃130 and 195, respectively, have their origin in an overestimation of the N=82 and 126 shell strength in global mass models such as FRDM and ETFSI-1. Fig. 1 displays the S2n values for Cd isotopes
The number of independent sets in the grid graph
- SIAM J. Discrete Math
, 1998
"... Abstract. If f(m,n) is the (vertex) independence number of the m × n grid graph, then we show that the double limit η = def limm,n→ ∞ f(m,n) 1 mn exists, thereby refining earlier results of Weber [2] and Engel [1]. We establish upper and lower bounds for η, and prove that 1.503047782... ≤ η ≤ 1.5035 ..."
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Cited by 94 (4 self)
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.5035148.... Numerical computations suggest that the true value of η (the “hard square constant”) is around 1.5030480824753323.. Key words. independent sets, grid graphs AMS subject classifications. 05A16, 05C50, 82B20 Let Gm,n be the m×n grid graph. That is, the vertices of Gm,n are the (m+1)(n+1) points (i, j) (0 ≤ i
AMS subject classifications. 65N22, 65N50
"... A finite volume scheme for solving elliptic boundary value problems on composite grids Martijn Anthonissen ∗ , Bas van ’t Hof ∗ , Arnold Reusken † We present a finite volume scheme for solving elliptic boundary value problems with solutions that have one or a few small regions with high activity. Th ..."
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A finite volume scheme for solving elliptic boundary value problems on composite grids Martijn Anthonissen ∗ , Bas van ’t Hof ∗ , Arnold Reusken † We present a finite volume scheme for solving elliptic boundary value problems with solutions that have one or a few small regions with high activity
Self-concordance at work: Toward understanding the motivational effects of transformational leaders.
- Academy of Management Journal,
, 2003
"... We extend existing theories by linking transformational leadership to "self-concordance" at work. In two studies using diverse samples and methods, leader behaviors were associated with follower tendencies to set self-concordant goals. In general, followers of transformational leaders vie ..."
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Cited by 113 (3 self)
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in which transformational leaders motivate followers: by increasing follower self-efficacy, by facilitating followers' social identification with their group, and by linking work values to follower valuesthus increasing the extent to which followers view their work as self-expressive. First
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