background and objectives: biosurfactants are surface active agents with broad range commercial applications in various industries and have considerable advantages over their chemical counterparts. materials and methods: in this study, bacteria were isolated from contaminated and uncontaminated soil and selected during preliminary screening using hemolytic activity, oil spreading and oil collap...

During unmoderated discussions it is commonly observed that some people end up having more influence than seems justified by the actual quality of their contributions. In this paper, we propose and illustrate a spreading-activation architecture for modeling such differential influence. In our model, each participant’s level of influence vis-à-vis others in a discussion emerges out of the interp...

Online social networks enable fast and wide diffusion of rumors, which could be potential threats to the society. Understanding the rumor spreading mechanism is therefore essential. This demo presents an agent-patternbased model that can explain the spiky temporal diffusion pattern of rumors. The demo platform provides an interface allowing users to check a wide set of parameters contribute to ...

The cognitive architecture MicroPsi builds on a framework for simulating agents as neuro-symbolic spreading activation networks. These agents are situated in a simulation environment or fitted with robotic bodies. The current implementation of MicroPsi has been re-implemented from the ground up and is described here.

In this paper, we describe a collaborative filtering approach that uses features of users and items to better represent the problem space and to provide better recommendations to users. Features of the collaborative filtering dataset are found and incorporated into a network representation of the collaborative filtering space where users and items are represented by nodes and where the nodes ar...

We start by presenting the Tip-Of-the-Tongue (TOT) problem and some theories accounting for it. We go then on to consider it within the framework of a neurobiological, computational model: Guided Propagation Networks (GPNs). “Selective facilitation”, a feature of the model, allows us to formulate and test various hypotheses accounting for the impeded access to a target word. We will illustrate ...