Many biological and physical systems exhibit population-density dependent transitions to synchronized oscillations in a process often termed "dynamical quorum sensing". Synchronization frequently arises through chemical communication via signaling molecules distributed through an external medium. We study a simple theoretical model for dynamical quorum sensing: a heterogenous population of limi...

Radio channel has been a precious resource to manage since the take off of the mobile communications in late 70s. Several techniques have proposed over the years trying maximize utilization while allowing a number of users to share the channel. Among those techniques, CDMA has arisen as one of the most popular ones, and several approaches have been taken following the concept of carrier sensing...

This article talks about the building of QUORUM-W and the strategies outlined to accomplish this work. QUORUM-W is part of a research project called—COLMEIA— which focusses on the study of the issues concerned in the construction of an environment for the development of custom-tailored cooperative applications.

An immediate corollary is that it is always possible to pick a Z-lattice inside QS so that the corresponding p-modular reduction is isomorphic to the dual of the conventional p-modular reduction (coming from the standard basis and written FpS λ). Thus our theorem gives a rich source of examples of non-isomorphic p-modular reductions. It would be interesting to know how far it is possible, by pi...

In this paper, the utility of Landsat TM imagery for water quality studies in East Texas is investigated. Remote sensing has an important and effective role in water quality management. Remote sensing satellites measure the amount of solar radiation reflected by surface water and the reflectance of water depend upon the concentration and character of water quality parameters. Three water qualit...

We analyze single binary-choice voting rules and identify the presence of the No-Show paradox in this simple setting, as a consequence of specific turnout or quorum conditions that are included in actual rules. Since these conditions are meant to ensure a representative outcome, we formalize this concern and reach our main result: no voting rule can ensure representation if abstention is possib...

PURPOSE Bacillus endophthalmitis is a highly explosive infection of the eye that commonly results in rapid inflammation and vision loss, if not loss of the eye itself, within a few days. Quorum-sensing-controlled toxins are essential to virulence during infection. Another unique characteristic of this disease is the ability of Bacillus to replicate rapidly and migrate to all parts of the eye. T...

PldB, a Putative Phospholipase D Homologue, Mediates Quorum Sensing in Dictyostelium discoideum Development by Yi Chen Adviser: Derrick Brazill, Ph.D. Quorum sensing, the ability to measure the local cell density, is required for animal cells to achieve proper cell growth, differentiation and development. However, because of the genetic intractability of mammalian cells, we study quorum sensing...