We study the control of modulational instability and pattern formation in a nonlinear dissipative feedback system with a periodic modulation of the material refractive index. We use a one-dimensional photonic lattice in a single-mirror feedback configuration and identify three mechanisms for pattern control: bandgap suppression of instability modes, periodicity induced pattern modes, and orient...

We present some numerical results obtained from a simple individual-based model that describes clustering of organisms caused by competition. Our aim is to show that, even when a deterministic description developed for continuum models predicts no pattern formation, an individual-based model displays well-defined patterns, as a consequence of fluctuation effects caused by the discrete nature of...

this paper illustrates the design and implementation of fain (filtering agent for internet) based on the gaia methodology and the auml notation. the proposed system generates and maintains a user profile by learning from examples that are judged and classified by the user during the training stage. a learning algorithm which is based on the baldwin effect that combines learning with evolution i...

introduction: implementation of hospital information system (his) depends on the complete organizational change in which most effective factors need to be considered. since the most important factor is human resources, training, survey, information and acceptance of the staff toward the his are also essential issues. we investigated the implementation of his in imam khomeini hospital. methods: ...

naturally all activities are along with risk and uncertainties. project risk has the concept more than the financial concept. in project management, risks are events that can occur during the project implementation and has negative effects on project completion and meeting goals. identification, analysis, prioritizing and having plan for dealing with these events are playing an important role i...

We studied the effect of nearest pattern interaction on a global pattern formation in a two-dimensional space, where patterns are to grow initially from a noise in the presence of a periodic supply of energy. Although our approach is general, we found that this study is relevant in particular to the pattern formation on a periodically vibrated granular layer, as it gives a unified perspective o...

one of the most important steps in policy making process is the implementation phase. unsuccessful implementation of complied policies especially industrial policies is one of the problems that almost all developing countries and developed ones, face with and they have paid irreparable costs for this problem too. the model for implementation of industrial policies in qom province presented in t...