Hierarchical task network and action-based planning approaches have traditionally been studied separately. In many domains, human expertise in the form of hierarchical reduction schemas exists, but is incomplete. In such domains, hybrid approaches that use both HTN and action-based planning techniques are needed. In this paper, we extend our previous work on refinement planning to include hiera...

Stigmergy is usually associated with semantically simple problems such as routing. It can be applied to more complex problems by encoding them in the environment through which stigmergic agents interact. We demonstrate this approach by showing how stigmergic agents can plan over a hierarchical task network, specifically a resource-oriented dialect of the TÆMS language. We not only report our su...

This article describes SHPE (Simple Hierarchical Planning Engine), a hierarchical task network planning system designed to generate dynamic behaviours for real-time video games. SHPE is based on a combination of domain compilation and procedural task application/decomposition techniques in order to compute plans in a very short time-frame. The planner has been able to return relevant plans in l...

Stigmergy is usually used to model semantically simple problems such as routing. It can be applied to more complex problems by encoding them in the stigmergic environment. We demonstrate this approach by showing how stigmergic agents can plan over a hierarchical task network, specifically a resource-oriented dialect of the TÆMS language.

One of the assumptions in classical planning is that the environment is static: i.e., the planner is the only entity that can induce changes in the environment. A more realistic assumption is that the environment is dynamic; that is, there are other entities in the world and the actions generated by the planner may fail due to the operations of these entitites. In this paper, we describe a plan...

A large number of different lesions and pathologies can affect the human digestive system, resulting in life-threatening situations. Early detection plays a relevant role successful treatment increase current survival rates to, e.g., colorectal cancer. The standard procedure enabling detection, endoscopic video analysis, generates quantities visual data that need to be carefully analyzed by an ...