Temporally weighting a time varying noise field to improve Green function retrieval

Green function retrieval and time reversal in a disordered world.

We apply the theory of multiple wave scattering to two contemporary, related topics: imaging with diffuse correlations and stability of the time reversal of diffuse waves, using equipartition, coherent backscattering, and frequency speckles as fundamental concepts.

Time-Varying Monetary Policy Reaction Function: The Case of Iran

Time-Sensitive Weighting for Microblog Retrieval

We report our system and experiments for the realtime Adhoc task in the 2011 MicroBlog track. Our goal is to develop effective technique to retrieve relevant tweets that have been posted recently. In particular, we propose a time-­sensitive term weighting strategy that can favor tweets in hot-­discussed time and a document length related weighting method that can favor long tweets which are mor...

Improve Precategorized Collection Retrieval by Using Supervised Term Weighting Schemes

The emergence of the world-wide-web has led to an increased interest in methods for searching for information. A key characteristic of many of the online document collections is that the documents have predefined category information, for example, the variety of scientific articles accessible via digital libraries (e.g., ACM, IEEE, etc.), medical articles, news-wires, and various directories (e...

Robust noise power spectral density estimation for binaural speech enhancement in time-varying diffuse noise field

In speech enhancement, noise power spectral density (PSD) estimation plays a key role in determining appropriate de-nosing gains. In this paper, we propose a robust noise PSD estimator for binaural speech enhancement in timevarying noise environments. First, it is shown that the noise PSD can be numerically obtained using an eigenvalue of the input covariance matrix. A simplified estimator is t...