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Search Results: 1 - 10 of 20598 matches for " Anders Bo Rasmussen "
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Lynn Vavreck: The Message Matters - The Economy and Presidential Campaigns. Princeton: Princeton University Press. 2009.
Anders Bo Rasmussen
MedieKultur : Journal of Media and Communication Research , 2010,
Abstract:
Institutional Games Rational Actors Play The empowering of the European Parliament
Anders Rasmussen
European Integration Online Papers , 2000,
Abstract: In the three latest treaty reforms changes have been made to the procedures that regulate the legislative interaction between the European Parliament, the Commission and the Council. Whether the introduction of the co-operation procedure (1987), the co-decision procedure (1994) and the reform of the co-decision procedure (1999) have marked a linear increase in the power of the EP has been the object of debate. However, it has not been disputed that these three procedures vis-à-vis the consultation procedure give the EP a significant legislative role not previously enjoyed. To explain the empowering of the EP, this paper takes its point of departure in the causality between institutional choices and institutional consequences. Using spatial theory and drawing on historical institutionalism it introduces an analytical model that operates on two levels, the level of day-to-day politics and the level of treaty reforms. Two main points are made. First, adapting strategically to the de jure legislative procedures the EP has been able to convert these into de facto procedures that grant it a substantial legislative role. Second, this empowering has enabled the EP and the Commission to pursue a pro-integrationist agenda in a two-level game of legislation and implementation.
Institutional Games Rational Actors Play The empowering of the European Parliament
Anders Rasmussen
European Integration Online Papers , 2000,
Abstract: In the three latest treaty reforms changes have been made to the procedures that regulate the legislative interaction between the European Parliament, the Commission and the Council. Whether the introduction of the co-operation procedure (1987), the co-decision procedure (1994) and the reform of the co-decision procedure (1999) have marked a linear increase in the power of the EP has been the object of debate. However, it has not been disputed that these three procedures vis-à-vis the consultation procedure give the EP a significant legislative role not previously enjoyed. To explain the empowering of the EP, this paper takes its point of departure in the causality between institutional choices and institutional consequences. Using spatial theory and drawing on historical institutionalism it introduces an analytical model that operates on two levels, the level of day-to-day politics and the level of treaty reforms. Two main points are made. First, adapting strategically to the de jure legislative procedures the EP has been able to convert these into de facto procedures that grant it a substantial legislative role. Second, this empowering has enabled the EP and the Commission to pursue a pro-integrationist agenda in a two-level game of legislation and implementation.
The Prognostic Importance of EGFR and COX-2 Expression in Cervix Cancer Stages IIb-IVa  [PDF]
Parvin Adimi, Karina Dahl Steffensen, Doris Schledermann, Eva Rye Rasmussen, Anders Jakobsen
Journal of Cancer Therapy (JCT) , 2011, DOI: 10.4236/jct.2011.21002
Abstract: Objectives. Locally advanced cervix cancer represents a therapeutic challenge with a delicate balance between effect and toxicity. Consequently, there is an obvious need for new prognostic parameters with a perspective of a more individualized treatment. The aim of the present study was to evaluate the possible prognostic importance of epidermal growth factor receptor and cyclooxygenase-2 expression in locally advanced cervix cancer. Methods. The study included 91 patients with cervix cancer, FIGO stages IIb-IVa, and were treated with curative intent according to the Nordic Cervix Cancer protocol (NOCECA). The median observation time was 7 years. Epidermal growth factor receptor and cyclooxygenase-2 expression was evaluated by immunohistochemistry using commercially available antibodies. The tumor marker expression was evaluated according to a semi-quantitative scoring system with a positive score when more than 10% of the tumor cells were moderately or strongly stained. Results. Epidermal growth factor receptor and cyclooxygenase-2 over-expression was found in 22% and 18% of the patients, respectively. The survival differed according to epidermal growth factor receptor and cyclooxygenase-2 over-expression as calculated by Kaplan-Meier plots and log-rank test (p = 0.0002 and p = 0.0084 respectively). A multivariate Cox Regression analysis identified each tumor marker as an independent prognostic factor. Conclusion. The results clearly indicate epidermal growth factor receptor and cyclooxygenase-2 hold important prognostic information, markedly appearing with a long-term observation. We found that both parameters were independent prognostic factors, and to further clarify this matter our retrospective analysis should be confirmed in a prospective study with more patients.
[download] (1035)Coordinate Descent Methods for the Penalized Semiparametric Additive Hazards Model
Anders Gorst-Rasmussen,Thomas H. Scheike
Journal of Statistical Software , 2012,
Abstract: For survival data with a large number of explanatory variables, lasso penalized Cox regression is a popular regularization strategy. However, a penalized Cox model may not always provide the best fit to data and can be difficult to estimate in high dimension because of its intrinsic nonlinearity. The semiparametric additive hazards model is a flexible alternative which is a natural survival analogue of the standard linear regression model. Building on this analogy, we develop a cyclic coordinate descent algorithm for fitting the lasso and elastic net penalized additive hazards model. The algorithm requires no nonlinear optimization steps and offers excellent performance and stability. An implementation is available in the R package ahaz. We demonstrate this implementation in a small timing study and in an application to real data.
Independent screening for single-index hazard rate models with ultra-high dimensional features
Anders Gorst-Rasmussen,Thomas H. Scheike
Statistics , 2011,
Abstract: In data sets with many more features than observations, independent screening based on all univariate regression models leads to a computationally convenient variable selection method. Recent efforts have shown that in the case of generalized linear models, independent screening may suffice to capture all relevant features with high probability, even in ultra-high dimension. It is unclear whether this formal sure screening property is attainable when the response is a right-censored survival time. We propose a computationally very efficient independent screening method for survival data which can be viewed as the natural survival equivalent of correlation screening. We state conditions under which the method admits the sure screening property within a general class of single-index hazard rate models with ultra-high dimensional features. An iterative variant is also described which combines screening with penalized regression in order to handle more complex feature covariance structures. The methods are evaluated through simulation studies and through application to a real gene expression dataset.
Collisional transport across the magnetic field in drift-fluid models
Jens Madsen,Volker Naulin,Anders Henry Nielsen,Jens Juul Rasmussen
Physics , 2015,
Abstract: Drift ordered fluid models are widely applied in studies of low-frequency turbulence in the edge and scrape-off layer regions of magnetically confined plasmas. Here, we show how collisional transport across the magnetic field is self-consistently incorporated into drift-fluid models without altering the drift-fluid energy integral. We demonstrate that the inclusion of collisional transport in drift-fluid models gives rise to diffusion of particle density, momentum and pressures in drift-fluid turbulence models and thereby obviate the customary use of artificial diffusion in turbulence simulations. We further derive a computationally efficient, two-dimensional model which can be time integrated for several turbulence de-correlation times using only limited computational resources. The model describes interchange turbulence in a two-dimensional plane perpendicular to the magnetic field located at the outboard midplane of a tokamak. The model domain has two regions modeling open and closed field lines. The model employs a computational expedient model for collisional transport. Numerical simulations show good agreement between the full and the simplified model for collisional transport.
Quasi-Species and Aggregate Dynamics
Anders Eriksson,Olof G?rnerup,Martin Nilsson Jacobi,Steen Rasmussen
Quantitative Biology , 2005,
Abstract: At an early stage in pre-biotic evolution, groups of replicating molecules must coordinate their reproduction to form aggregated units of selection. Mechanisms that enable this to occur are currently not well understood. In this paper we introduce a deterministic model of primitive replicating aggregates, proto-organisms, that host populations of replicating information carrying molecules. Some of the molecules promote the reproduction of the proto-organism at the cost of their individual replication rate. A situation resembling that of group selection arises. We derive and analytically solve a partial differential equation that describes the system. We find that the relative prevalence of fast and slow replicators is determined by the relative strength of selection at the aggregate level to the selection strength at the molecular level. The analysis is concluded by a preliminary treatment of finite population size effects.
Why FARIMA Models are Brittle
Anders Gorst-Rasmussen,Darryl Veitch,András Gefferth
Statistics , 2012,
Abstract: The FARIMA models, which have long-range-dependence (LRD), are widely used in many areas. Through deriving a precise characterisation of the spectrum, autocovariance function, and variance time function, we show that this family is very atypical among LRD processes, being extremely close to the fractional Gaussian noise in a precise sense. Furthermore, we show that this closeness property is not robust to additive noise. We argue that the use of FARIMA, and more generally fractionally differenced time series, should be reassessed in some contexts, in particular when convergence rate under rescaling is important and noise is expected.
Optimal Linear Control over Channels with Signal-to-Noise Ratio Constraints
Erik Johannesson,Anders Rantzer,Bo Bernhardsson
Mathematics , 2012,
Abstract: We consider a networked control system where a linear time-invariant (LTI) plant, subject to a stochastic disturbance, is controlled over a communication channel with colored noise and a signal-to-noise ratio (SNR) constraint. The controller is based on output feedback and consists of an encoder that measures the plant output and transmits over the channel, and a decoder that receives the channel output and issues the control signal. The objective is to stabilize the plant and minimize a quadratic cost function, subject to the SNR constraint. It is shown that optimal LTI controllers can be obtained by solving a convex optimization problem in the Youla parameter and performing a spectral factorization. The functional to minimize is a sum of two terms: the first is the cost in the classical linear quadratic control problem and the second is a new term that is induced by the channel noise. %todo ta bort meningen? A necessary and sufficient condition on the SNR for stabilization by an LTI controller follows directly from a constraint of the optimization problem. It is shown how the minimization can be approximated by a semidefinite program. The solution is finally illustrated by a numerical example.
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