introduction        gāthic texts are a collection of religious songs of zarothustra who lived about 1200 bc. of the seventy two hāts (stanzas) of yasna (one of the five chapters of avesta), seventeen hāts belong to five gāthas. these seventeen hāts have been classified into five categories based on their syllabic meter and the number of the song: 1) ahunavaiti, 2) ushtavaiti, 3)spanta.mainyu, ...

An important technique to reduce the contention on the limited bandwidth of wireless channels between mobile units and base stations is caching frequently accessed data items. In the literature, two approaches were proposed for cache consistency: Stateful and Stateless. In the Stateful approach, the server has to keep information about all the mobile units in its cell. On the other hand, in the...

Stateless greedy forwarding based on physical positions of nodes is considered to be more scalable than conventional topology-based routing. However, the stateless nature of geographic forwarding also prevents it from predicting holes in node distribution. Thus, frequent topology holes can significantly degrade the performance of geographic forwarding. So far the approaches mostly depend on exc...

This thesis is about an extension of context-free grammars with partial commutation on nonterminal symbols. In particular, we investigate the subclass with transitive dependence relation and the corresponding automaton model: stateless multi-pushdown automata. The results of the thesis are divided into three chapters. The first chapter investigates language expressivity of concerned classes. Ro...

An array of Tunisian lifeworlds in 2016.