Scientific workflow system. A scientific workflow system is a specialized form of a workflow management system designed specifically to compose and execute a series of computational or data manipulation steps, or a workflow, in a scientific application.
A specialized form of scientific workflow systems is a bioinformatics workflow management system which focuses on a specific domain of science, bioinformatics. The rising interest in scientific workflow systems has coincided with rising interest in e-Science technologies and applications, and in grid computing. The vision of e-Science is that of distributed scientists being able to collaborate on conducting large scale scientific experiments and knowledge discovery applications using distributed systems of computing resources, data sets, and devices. Scientific workflow systems play an important role in enabling this vision.
There are many motives for differentiating scientific workflows from traditional business process workflows. Multi-Agent System. Intelligence as an Emergent Behavior or, The Songs of Eden. Published on Monday, March 16, 01998 • 16 years, 1 month ago Written by Danny Hillis for Daedalus Sometimes a system with many simple components will exhibit a behavior of the whole that seems more organized than the behavior of the individual parts.
Consider the intricate structure of a snowflake. Symmetric shapes within the crystals of ice repeat in threes and sixes, with patterns recurring from place to place and within themselves at different scales. The shapes formed by the ice are consequences of the local rules of interaction that govern the molecules of water, although the connection between the shapes and the rules is far from obvious. Afterall, these are the same rules of interaction that cause water to suddenly turn to steam at its boiling point and cause whirlpools to form in a stream. This is a seductive idea, since it allows for the possibility of constructing intelligence without first understanding it. Emergent Intelligence in Competitive Multi-Agent Systems. By Sander M.
Bohte, Han La Poutré Getting systems with many independent participants to behave is a great challenge. At CWI, the Computational Intelligence and Multi- Agent Games research group applies principles from both the economic field of mechanism design and state-of-the-art machine-learning techniques to develop systems in which 'proper' behaviour emerges from the selfish actions of their components. With the rapid transition of the real economy to electronic interactions and markets, applications are numerous: from automatic negotiation of bundles of personalized news, to efficient routing of trucks or targeted advertisement. In an economic setting, an individual - or agent - is assumed to behave selfishly: agents compete with each other to acquire the most resources (utility) from their interactions. Emergent Intelligence of Networked Agents. Emergent Intelligence and Language by Binh Nguyen Part 1 of 3.
Ant colony optimization algorithms. Ant behavior was the inspiration for the metaheuristic optimization technique This algorithm is a member of the ant colony algorithms family, in swarm intelligence methods, and it constitutes some metaheuristic optimizations.
Initially proposed by Marco Dorigo in 1992 in his PhD thesis,[1][2] the first algorithm was aiming to search for an optimal path in a graph, based on the behavior of ants seeking a path between their colony and a source of food. The original idea has since diversified to solve a wider class of numerical problems, and as a result, several problems have emerged, drawing on various aspects of the behavior of ants.
Overview[edit] Summary[edit] In the natural world, ants (initially) wander randomly, and upon finding food return to their colony while laying down pheromone trails. Over time, however, the pheromone trail starts to evaporate, thus reducing its attractive strength. Common extensions[edit] Ants Colony and Multi-Agents. Ants Colony and Multi-Agents Individual ants are simple insects with limited memory and capable of performing simple actions.
However, an ant colony expresses a complex collective behavior providing intelligent solutions to problems such as carrying large items, forming bridges and finding the shortest routes from the nest to a food source. A single ant has no global knowledge about the task it is performing. The ant's actions are based on local decisions and are usually unpredictable.
The intelligent behavior naturally emerges as a consequence of the self-organization and indirect communication between the ants. Luca Gambardella: Ant Colony Optimization. By Luca Maria Gambardella and Marco Dorigo Ant Colony Optimization: ants inspired systems for combinatorial optimization The ant colony optimization metaheuristic (ACO, Dorigo, Di Caro and Gambardella 1999) is a population-based approach to the solution of combinatorial optimization problems.
The basic ACO idea is that a large number of simple artificial agents are able to build good solutions to hard combinatorial optimization problems via low-level based communications. Real ants cooperate in their search for food by depositing chemical traces (pheromones) on the floor. Artificial Ants for Optimization: Breaking Benchmark Records / Swarm Intelligence. Artificial Ants (AAs) communicate via artificial pheromones that evaporate over time.
To solve complex optimization problems, Schmidhuber's fellow co-director Luca Maria Gambardella (IDSIA) and Marco Dorigo (ex-IDSIA, now professor in Belgium) introduced AAs equipped with local search methods. This approach broke several important benchmark world records, including those for sequential ordering problems and routing problems (essential for vehicle routing, internet routing, routing in ad-hoc networks, and so on). Check out some of the numerous citations at Google Scholar.
This success led to a recent IDSIA spin-off company called ANTOPTIMA. Commercial applications include vehicle routing, logistics for the largest Mediterranean container terminal in LaSpezia, and truck fleet management (the largest Swiss retailer is now using AAs to distribute its goods). Multi-agent system.