This commentary is motivated by the papers “Unconventional Monetary Policy and the Great Recession: Estimating the Macroeconomic Effects of a Spread Compression at the Zero Lower Bound” by Christiane Baumeister and Luca Benati (this issue) and “House Prices, Credit Growth, and Excess Volatility: Implications for Monetary and Macroprudential Policy” by Paolo Gelain, Kevin J. Lansing, and Caterin...

Previous work has shown that multilevel modeling can be a valuable technique for epidemiologic analysis. The complexity of using this approach, however, continues to restrict its general application. A critical factor is the lack of flexible and appropriate software for multilevel modeling. SAS provides a macro, GLIMMIX, that can be used for multilevel modeling, but that is not sufficient for a...

Social modeling applies computational methods and techniques to the analysis of social processes and human behavior. Cultural algorithms (CA’s) are evolutionary systems which utilize agent technology and which supports any evolutionary strategy like genetic algorithm, evolutionary algorithm or swarm intelligence or ant algorithms. CA’s have been used for modeling the evolution of complex social...

A time domain modeling and simulation tool for beam-cavity interactions in LER and HER rings at PEP II are presented. The motivation for this tool is to explore the stability margins and performance limits of PEP II RF systems at higher currents and upgraded RF configurations. It also serves as test bed for new control algorithms and can define the ultimate limits of the architecture. The time ...

In order to accommodate growing traffic demands, next generation cellular networks must become highly heterogeneous to achieve capacity gains. Heterogeneous cellular networks composed of macro base stations and low-power base stations of different types are able to improve spectral efficiency per unit area, and to eliminate coverage holes. In such networks, intelligent user association and reso...

Recently, there has been great progress in the fabrication of various nano-devices utilizing silicon ULSI processing techniques [1]. Reliable room temperature operations have been demonstrated in a silicon single-electron quantum-dot transistor [2], a silicon selfassembled quantum-dot transistor [3], and various types of single-electron memory cells [4,5]. However, these single electron or quan...

We consider the dynamics of cultural evolution in spatially-structured populations. Most spatially explicit modeling approaches can be broadly divided into two classes: microand macro-level models. Macro-level models study cultural evolution at the population level and describe the average behavior of the considered system. Conversely, micro-level models focus on the constituent units of the sy...