5,915 research outputs found
Spinodal fractionation in a polydisperse square well fluid
Using Kinetic Monte Carlo simulation, we model gas-liquid spinodal
decomposition in a size-polydisperse square well fluid, representing a
'near-monodisperse' colloidal dispersion. We find that fractionation (demixing)
of particle sizes between the phases begins asserting itself shortly after the
onset of phase ordering. Strikingly, the direction of size fractionation can be
reversed by a seemingly trivial choice between two inter-particle potentials
which, in the monodisperse case, are identical -- we rationalise this in terms
of a perturbative, equilibrium theory of polydispersity. Furthermore, our
quantitative results show that Kinetic Monte Carlo simulation can provide
detailed insight into the role of fractionation in real colloidal systems.Comment: 7 pages, 7 figures, to be published in Phys. Rev.
Revisiting the Core Ontology and Problem in Requirements Engineering
In their seminal paper in the ACM Transactions on Software Engineering and
Methodology, Zave and Jackson established a core ontology for Requirements
Engineering (RE) and used it to formulate the "requirements problem", thereby
defining what it means to successfully complete RE. Given that stakeholders of
the system-to-be communicate the information needed to perform RE, we show that
Zave and Jackson's ontology is incomplete. It does not cover all types of basic
concerns that the stakeholders communicate. These include beliefs, desires,
intentions, and attitudes. In response, we propose a core ontology that covers
these concerns and is grounded in sound conceptual foundations resting on a
foundational ontology. The new core ontology for RE leads to a new formulation
of the requirements problem that extends Zave and Jackson's formulation. We
thereby establish new standards for what minimum information should be
represented in RE languages and new criteria for determining whether RE has
been successfully completed.Comment: Appears in the proceedings of the 16th IEEE International
Requirements Engineering Conference, 2008 (RE'08). Best paper awar
The Oberlin College Forensic Union...
One of the contributions we believe a college may take to this widespread public discussion is to furnish trained student speakers, capable of providing provocative and critical analyses of current public questions. Since 1927, Oberlin College, through the Forensic Union and the Department of Speech, has offered such a service. This service is available without charge to organizations within a reasonable distance of Oberlin; there is no tariff on public discussion. Organizations are requested to furnish transportation for the speakers or to reimburse them for their traveling expenses, but otherwise the service is a contribution of Oberlin College
Internationalizing The Discipline: Past, Present and Future
The article offers information on the efforts of various associations and academicians to promote the internationalization of communication studies
Concurrent bandits and cognitive radio networks
We consider the problem of multiple users targeting the arms of a single
multi-armed stochastic bandit. The motivation for this problem comes from
cognitive radio networks, where selfish users need to coexist without any side
communication between them, implicit cooperation or common control. Even the
number of users may be unknown and can vary as users join or leave the network.
We propose an algorithm that combines an -greedy learning rule with a
collision avoidance mechanism. We analyze its regret with respect to the
system-wide optimum and show that sub-linear regret can be obtained in this
setting. Experiments show dramatic improvement compared to other algorithms for
this setting
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