We propose that the majority of quasars at redshift z ∼ 1 − 5 formed in the environment of new born collapsed halos with 1-D velocity dispersion σ1d v ∼ 400 km s−1. The harboring coefficient f of quasars per halo and the lifetime of quasars depend only on local process, not modulated by the density inhomogeneities on scales larger than the size of the halos. Thus, the bias of quasars on scale l...

The objective of this paper is to control the phase shifting by applying a bias DC voltage and changing the mechanical characteristics in electrostatically-actuated micro-beams. This problem can be more useful in the design of micro-phase shifters, which has not generally been investigated their mechanical behavior. By presenting a mathematical modeling, Galerkin-based step by step linearizatio...

Submitted for the MAR07 Meeting of The American Physical Society A Model of Codon Usage Bias MORTEN KLOSTER, CHAO TANG, UCSF — The genetic code is degenerate; most amino acids can be encoded by from two to as many as six different codons. While one might expect these codons to be used with equal frequency, this turns out not to be the case—not only are some codons favored over others, but their...

We use a simplified version of the halo model with a power law power spectrum to study scale dependence in galaxy bias at the very large scales relevant to baryon oscillations. In addition to providing a useful pedagogical explanation of the scale dependence of galaxy bias, the model provides an analytic tool for studying how changes in the Halo Occupation Distribution (HOD) impact the scale de...

The model RecMap for high-level vision, based on the DUAL architecture, is founded on the assumption that analogy-making lies at the core of human cognition. According to the model, vision is a constructive process of continuous generation and verification of hypotheses. However, the same principle can be applied to the domain of social cognition to account for various observed effects such as ...

The bootstrap has become a popular method for exploring model (structure) uncertainty. Our experiments with artificial and realworld data demonstrate that the graphs learned from bootstrap samples can be severely biased towards too complex graphical models. Accounting for this bias is hence essential, e.g., when exploring model uncertainty. We find that this bias is intimately tied to (well-kno...

In the recent methodological literature, various models have been proposed to account for the phenomenon that reversed items (defined as items for which respondents' scores have to be recoded in order to make the direction of keying consistent across all items) tend to lead to problematic responses. In this article we propose an integrative conceptualization of three important sources of revers...

ABSTRACT In the credit risk modeling literature, there are two different viewpoints towards the structural model of Merton. Many empirical tests show that the Merton model overestimates corporate bond prices substantially. However, there are other empirical works defensing that the Merton model is useful in predicting default and performs well in estimating deposit insurance fund. In this paper...