20,591 research outputs found
Congruency fit: beyond performance in the auto supplier industry
The effects of manufacturing strategy (MS) and technology (T) on performance have been
studied separately, but few studies have examined the relationship between MS and T practices
clusters that improve effectiveness when implemented jointly, and even then they do not
consider possible congruency between the two. This paper develops a congruency (selection)
model to test for any interconnection between said clusters, without addressing causation or their
combined effect on performance. The implicit outcome is that the plant will achieve a desirable
effectiveness level. Through a wide-ranging survey of auto supplier plants, two approaches are
considered: 1) grouping both clusters in pairs (canonical correlation analysis); and 2) a more
general selection view version, with practices from both clusters related multidimensionally and
subordinated by bivariate analysis (regression) to test for any congruent pattern. Both methods
find a congruent relationship between manufacturing strategy and technology practice clusters,
although the second provides greater detail.Ministerio de EducaciĂłn y Ciencia DPI-2006-0553
A Low-Dimensional Representation for Robust Partial Isometric Correspondences Computation
Intrinsic isometric shape matching has become the standard approach for pose
invariant correspondence estimation among deformable shapes. Most existing
approaches assume global consistency, i.e., the metric structure of the whole
manifold must not change significantly. While global isometric matching is well
understood, only a few heuristic solutions are known for partial matching.
Partial matching is particularly important for robustness to topological noise
(incomplete data and contacts), which is a common problem in real-world 3D
scanner data. In this paper, we introduce a new approach to partial, intrinsic
isometric matching. Our method is based on the observation that isometries are
fully determined by purely local information: a map of a single point and its
tangent space fixes an isometry for both global and the partial maps. From this
idea, we develop a new representation for partial isometric maps based on
equivalence classes of correspondences between pairs of points and their
tangent spaces. From this, we derive a local propagation algorithm that find
such mappings efficiently. In contrast to previous heuristics based on RANSAC
or expectation maximization, our method is based on a simple and sound
theoretical model and fully deterministic. We apply our approach to register
partial point clouds and compare it to the state-of-the-art methods, where we
obtain significant improvements over global methods for real-world data and
stronger guarantees than previous heuristic partial matching algorithms.Comment: 17 pages, 12 figure
Evolutionary constraints on the complexity of genetic regulatory networks allow predictions of the total number of genetic interactions
Genetic regulatory networks (GRNs) have been widely studied, yet there is a
lack of understanding with regards to the final size and properties of these
networks, mainly due to no network currently being complete. In this study, we
analyzed the distribution of GRN structural properties across a large set of
distinct prokaryotic organisms and found a set of constrained characteristics
such as network density and number of regulators. Our results allowed us to
estimate the number of interactions that complete networks would have, a
valuable insight that could aid in the daunting task of network curation,
prediction, and validation. Using state-of-the-art statistical approaches, we
also provided new evidence to settle a previously stated controversy that
raised the possibility of complete biological networks being random and
therefore attributing the observed scale-free properties to an artifact
emerging from the sampling process during network discovery. Furthermore, we
identified a set of properties that enabled us to assess the consistency of the
connectivity distribution for various GRNs against different alternative
statistical distributions. Our results favor the hypothesis that highly
connected nodes (hubs) are not a consequence of network incompleteness.
Finally, an interaction coverage computed for the GRNs as a proxy for
completeness revealed that high-throughput based reconstructions of GRNs could
yield biased networks with a low average clustering coefficient, showing that
classical targeted discovery of interactions is still needed.Comment: 28 pages, 5 figures, 12 pages supplementary informatio
El rescate de la publicness desde lo estudios organizationales
Como debe definirse el concepto de la publicness desde la perspectiva de los estudios organizacionales? El texto considera importante regresar a las teorias fundacionales. Las organizaciones publicas son organizaciones con una naturaleza especifica. Un tercer momento presenta algunas razones y ejemplos de por quĂš las politicas, su hechura y gestion, ofrecen elementos fructiferos para plantear nuevas indagaciones empiricas sobre las organizaciones publicasestudios organizacionales; politicas y organicaziones publicas
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