We investigate a type of lossless source code called a grammar-based code, which, in response to any input data string over a fixed finite alphabet, selects a context-free grammar representing in the sense that is the unique string belonging to the language generated by . Lossless compression of takes place indirectly via compression of the production rules of the grammar . It is shown that, su...

—Context-aware mobile computing aims at designing applications that automatically adapt their behaviors to the available location information and the available nearby sensors and devices. This is done in order to fulfill tasks in a way that suits users' current context best. To achieve this, context representation and manipulation are important issues, so as to establish formal context models. ...

Effective manipulation of context is very important in providing the context-aware services. In recent years, a variety of context models have been proposed to p roperly handle the key aspects of the context, while focusing on scenario-based acquisition, management, and representation of context. However, they are difficult to be employed for the agent-based system requiring distributed reasoni...

We present a rendering of some common grammatical formalisms in terms of evolving algebras. Though our main concern in this paper is on constraint-based formalisms, we also discuss the more basic case of context-free grammars. Our aim throughout is to highlight the use of evolving algebras as a speci cation tool to obtain grammar formalisms.

A good software is a software that is invisible for the user. This is possible by making context explicit in the software. The increasingly interest for the notion of context appears through the number of approaches based on it. Initially, context was mainly considered in Engineering and Cognitive Science. Now even in Engineering, one sees two sub-approaches considering context at the level of ...

Anomaly-based detection applied in strongly interdependent systems, like Smart Grids, has become one of the most challenging research areas in recent years. Early detection of anomalies so as to detect and prevent unexpected faults or stealthy threats is attracting a great deal of attention from the scientific community because it offers potential solutions for context-awareness. These solution...

The present study aimed to investigate the effect of picture-based vs. context-base method onIranian intermediate EFL learners' knowledge of prepositions. The main question this study triedto answer were whether using picture-based vs. context-based method might enhance higherknowledge of prepositions in Iranian learners of English at intermediate level. To answer thequestions, 45 intermediate ...