DEFINITION A valid-time index is a temporal index that enables fast access to valid-time datasets. In a traditional database, an index is used for selection queries. When accessing valid-time databases such selections also involve the valid-time dimension (the time when a fact becomes valid in reality). The characteristics of the valid-time dimension imply various properties that the temporal i...

A bitemporal database is a database explicitly supporting two temporal coordinates, namely the valid time and the transaction time. In this paper we introduce the concept of logical data partitioning in bitemporal databases, where data are partitioned into blocks according to their own natural (temporal) properties and independently on the particular application. In this framework we consider b...

Abstract DNA methylation is one of the best-known epigenetic modifications in mammals. The alteration of DNA methylation patterns has been found to be related to many diseases, including cancer. It is well-known that during carcinogenesis, a site-specific DNA hypermethylation and a global DNA hypomethylation take place. This overall loss of DNA methylation has been proposed as a valid biomarker...

We introduce the temporal component of the stRDF data model and the stSPARQL query language, which have been recently proposed for the representation and querying of linked geospatial data that changes over time. With this temporal component in place, stSPARQL becomes a very expressive query language for linked geospatial data, going beyond the recent OGC standard GeoSPARQL, which has no suppor...

Real-world changes are generally discovered delayed by computer systems. The typical update patterns for traditional data warehouses on an overnight or even weekly basis enlarge this propagation delay until the information is available to knowledge workers. Typically, traditional data warehouses focus on summarized data (at some level) rather than detail data. For active data warehouse environm...

Much research work has recently focused on the problem of representing historical information in XML. This paper describes a number of temporal XML data models and provides their comparison according to the following properties: time dimension (valid time, transaction time), support of temporal elements and attributes, querying possibilities, association to XML Schema/DTD, and influence on XML ...

Abstract We introduce a new approach for creating pointwise confidence intervals the distribution of event times current status data. Existing methods are based on asymptotics. Our is binomial properties and motivates that very simple to apply valid guarantee nominal coverage. Although these necessarily conservative small sample sizes, asymptotically their coverage rate approaches one. This als...

published by the press syndicate of the university of cambridge This book is in copyright. Subject to statutory exception and to the provisions of relevant collective licensing agreements, no reproduction of any part may take place without the written permission of Cambridge University Press. A catalog record for this book is available from the British Library.

I think that contemporary society is like a great, complex network of attitudes, values, and worldviews, in which everything exists within different cultures and environments. This network keeps changing at every moment, with different parties interacting with each other, so that each experience that we come across can become an exciting source and medium for creation. As for music composition,...

Paradoxically, in the globalized world, contemporary architecture is represented as an illustration of the contemporary rupture between the rigor of structural geometry and the turgid corpulence of imagination. Moreover in times of cultural globalization local specificities dissolve. Nevertheless, there are trends, cultural traits, and influences of critical or intellectual tradition that persist.