University of Oviedo

About: University of Oviedo is a education organization based out in Oviedo, Spain. It is known for research contribution in the topics: Population & Catalysis. The organization has 13423 authors who have published 31649 publications receiving 844799 citations. The organization is also known as: Universidá d'Uviéu & Universidad de Oviedo.

Improvement of mineral and bone metabolism markers is associated with better survival in haemodialysis patients: the COSMOS study

Abstract: Background: Abnormalities in serum phosphorus, calcium and parathyroid hormone (PTH) have been associated with poor survival in haemodialysis patients. This COSMOS (Current management Of Secondary hyperparathyroidism: a Multicentre Observational Study) analysis assesses the association of high and low serum phosphorus, calcium and PTH with a relative risk of mortality. Furthermore, the impact of changes in these parameters on the relative risk of mortality throughout the 3-year follow-up has been investigated. Methods: COSMOS is a 3-year, multicentre, open-cohort, prospective study carried out in 6797 adult chronic haemodialysis patients randomly selected from 20 European countries. Results: Using Cox proportional hazard regression models and penalized splines analysis, it was found that both high and low serum phosphorus, calcium and PTH were associated with a higher risk of mortality. The serum values associated with the minimum relative risk of mortality were 4.4 mg/dL for serum phosphorus, 8.8 mg/dL for serum calcium and 398 pg/mL for serum PTH. The lowest mortality risk ranges obtained using as base the previous values were 3.6-5.2 mg/dL for serum phosphorus, 7.9-9.5 mg/dL for serum calcium and 168-674 pg/mL for serum PTH. Decreases in serum phosphorus and calcium and increases in serum PTH in patients with baseline values of >5.2 mg/dL (phosphorus), >9.5 mg/dL (calcium) and <168 pg/mL (PTH), respectively, were associated with improved survival. Conclusions: COSMOS provides evidence of the association of serum phosphorus, calcium and PTH and mortality, and suggests survival benefits of controlling chronic kidney disease-mineral and bone disorder biochemical parameters in CKD5D patients.

Effectiveness of Dyadic and Multi-Party Joint Ventures

Abstract: Using data from 80 joint-venture (JV) experiences, this article compares the influence on JV effectiveness of two alternative ways of management: relational investment and formal control. Our results show that the adoption of one or another is contingent upon the number of partners: while relational investment significantly influences the effectiveness of dyadic JVs, formal control is pivotal in the case of multi-party JVs.

Stochastic Stability Analysis of the Linear Continuous and Discrete PSO Models

Abstract: Particle swarm optimization (PSO) can be interpreted physically as a particular discretization of a stochastic damped mass-spring system. Knowledge of this analogy has been crucial to derive the PSO continuous model and to introduce different PSO family members including the generalized PSO (GPSO) algorithm, which is the generalization of PSO for any time discretization step. In this paper, we present the stochastic analysis of the linear continuous and generalized PSO models for the case of a stochastic center of attraction. Analysis of the GPSO second order trajectories is performed and clarifies the roles of the PSO parameters and that of the cost function through the algorithm execution: while the PSO parameters mainly control the eigenvalues of the dynamical systems involved, the mean trajectory of the center of attraction and its covariance functions with the trajectories and their derivatives (or the trajectories in the near past) act as forcing terms to update first and second order trajectories. The similarity between the oscillation center dynamics observed for different kinds of benchmark functions might explain the PSO success for a broad range of optimization problems. Finally, a comparison between real simulations and the linear continuous PSO and GPSO models is shown. As expected, the GPSO tends to the continuous PSO when time step approaches zero. Both models account fairly well for the dynamics (first and second order moments) observed in real runs. This analysis constitutes so far the most realistic attempt to better understand and approach the real PSO dynamics from a stochastic point of view.

Gold(I)-Catalyzed Enantioselective Synthesis of Functionalized Indenes†

Abstract: MEC/FEDER (CTQ2007-61436/BQU, FPU grant to A.M., Ramon y Cajal and Juan de la Cierva contracts to M.A.F.-R. and P.G.-G.) and Junta de Castilla y Leon (BU021A09) for financial support. We also thank Dr. A. Mendoza (Universidad de Oviedo) for his assistance with the X-ray crystallographic analysis

Human resource management systems and organizational performance: an analysis of the Spanish manufacturing industry

Abstract: This study analyses the relationship between human resource management systems and firm performance, using the Miles and Snow’s typology (1984). The hypotheses set forth to this respect are tested ...