Papers by Cecilia Hernández
Canadian Journal of Chemistry-revue Canadienne De Chimie, 1999
The interest in the study of p-lactams continues due to their therapeutic importance as antibioti... more The interest in the study of p-lactams continues due to their therapeutic importance as antibiotics. In this. work, six spiro-P-lactams (7a-7c, 8 a -8~) have been prepared using the [2+2] cycloaddition of isomaleimides to acid chlorides. The heterobicyclic structures obtained have been characterized by mass spectrometry, IR, NMR spectroscopy, and for compounds 7a, 7b, and 8b the X-ray crystallographic study showed a nearly planar arrangement for the P-lactam ring.
Distributed moving object database servers are a feasible solution to the scalability problem of ... more Distributed moving object database servers are a feasible solution to the scalability problem of centralized database systems. In this paper we propose a distributed indexing method, using the Distributed Hash Table (DHT) paradigm, devised to efficiently support complex spatio temporal queries. We assume a setting in which there is a large number of database servers that keep track of events associated with a highly dynamic system of moving objects deployed in a spatial area. We present a technique for properly keeping the index up to date and efficiently processing range and top-k queries for moving object databases. We evaluated our system using event-driven simulators with demanding spatio temporal workloads and the results show good performance in terms of response time and network traffic.
En la antigua Mesopotamia, por aquella época que nos remonta a la mítica construcción del muro de... more En la antigua Mesopotamia, por aquella época que nos remonta a la mítica construcción del muro de Babel, se dice que todos los hombres hablaban la misma lengua, sí, todos los pobladores de la tierra se comunicaban mediante un mismo dialecto y debido a la repentina confusión entre lenguas es entonces cuando la historia de la humanidad nos deslumbra con un giro alucinante.
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Papers by Cecilia Hernández