This paper presents a reflective architecture and an implemented prototype that supports aspect oriented programming in Smalltalk. The aspects are metaobjects which are weaved dynamically and the composition is noninvasive, thus enhancing flexibility and transparency.

Our previous research focused on reducing continuous monitoring overhead by employing architectural design that performs adaptive monitoring. In this paper we explore the use of other AOP or AOP-like tools for instrumentation. The goal is to find a tool that has lower overhead than AspectJ. Support for runtime changes of monitoring configuration is also considered. Our main topic of interest is...

The shape of an object is fundamental in object recognition but it is still an open issue to what extent shape differences are perceived analytically (i.e., by the dimensional structure of the shapes) or holistically (i.e., by the overall similarity of the shapes). The dimensional structure of a stimulus is available in a primary stage of processing for separable dimensions, although it can als...

Although local interactions involving orientation and spatial frequency are well understood, less is known about spatial interactions involving higher level pattern features. We examined interactive coding of aspect ratio, a prevalent two-dimensional feature. We measured perception of two simultaneously flashed ellipses by randomly post-cueing one of them and having observers indicate its aspec...

The identity of an object is a fixed property, independent of where it appears, and an effective visual system should capture this invariance [1-3]. However, we now report that the perceived gender of a face is strongly biased toward male or female at different locations in the visual field. The spatial pattern of these biases was distinctive and stable for each individual. Identical neutral fa...

We propose a minimal model for aeolian sand dunes. It combines an analytical description of the turbulent wind velocity field above the dune with a continuum saltation model that allows for saturation transients in the sand flux. The model provides a qualitative understanding of important features of real dunes, such as their longitudinal shape and aspect ratio, the formation of a slip face, th...

Pore-scale flow simulations were conducted to investigate the permeability tensor of anisotropic porous media constructed using the Voronoi tessellation method. This construction method enabled the introduction of anisotropy to the media at the particle level in a random and yet controllable way. Simulations were carried out for media with different degrees of anisotropy through varying the mea...

Software agents have to play roles during their collaborations in a multi-agent system (MAS). (Roles represent collaborative activities of the agents in a specific context. Many facets need to be considered on a role definition [7, 24], including the specification of events that trigger the role activation and deactivation. Each role also involves the specification of its specific knowledge. Ho...

A summary of any event type is only complete if certain information aspects are mentioned. For a court trial, readers will at least want to know who is involved and what the charges and the sentence are. For a natural disaster, they will ask for the disaster type, the victims and other damages. Will a co-occurrence or frequency-based sentence extraction summariser automatically provide the requ...

Aspect extraction identifies relevant features of an entity from a textual description and is typically targeted to product reviews, and other types of short text, as an enabling task for, e.g., opinion mining and information retrieval. Current aspect extraction methods mostly focus on aspect terms, often neglecting associated modifiers or embedding them in the aspect terms without proper disti...