POWER, the PhylOgenetic WEb Repeater, is a web-based service designed to perform user-friendly pipeline phylogenetic analysis. POWER uses an open-source LAMP structure and infers genetic distances and phylogenetic relationships using well-established algorithms (ClustalW and PHYLIP). POWER incorporates a novel tree builder based on the GD library to generate a high-quality tree topology accordi...

In this paper we explore two important issues, processor allocation and the use of hash lters, to improve the parallel execution of hash joins. To exploit the opportunity of pipelining for hash join execution, a scheme to transform a bushy execution tree to an allocation tree is rst devised. In an allocation tree, each node denotes a pipeline. Then, using the concept of synchronous execution ti...

A subset M of a continuum X is called meager composant if maximal with respect to the property that every two its points are contained in nowhere dense subcontinuum . Motivated by questions Bellamy, Mouron and Ordoñez, we show no tree-like has proper open composant, either 1 or 2 ℵ 0 composants. We also prove decomposition theorem: If indecomposable dense, then partition into composants upper s...

Trace-based compilers operate by dynamically discovering loop headers and then recording and compiling all paths through a loop that are executed with sufficient frequency. The different paths through each loop form a tree, with the loop header at the root, in which common code is shared up-stream. Such trace-trees can be serialized in a specific manner that allows us to organize the compiler p...

With the demand for machine learning increasing, so does the demand for tools which make it easier to use. Automated machine learning (AutoML) tools have been developed to address this need, such as the Tree-Based Pipeline Optimization Tool (TPOT) which uses genetic programming to build optimal pipelines. We introduce Layered TPOT, a modification to TPOT which aims to create pipelines equally g...