In this paper we consider the problem of answering queries using views, with or without ontological constraints, which is important for data integration, query optimization, and data warehouses. Our context is data integration, so we search for ...

Clustering has been a subject of wide research since it arises in many application domains. One of the clustering process issues is the evaluation of clustering results. Estimation of the obtained cluster structure quality is the main subject of cluster ...

In order to enable proper system and integration testing, it is often necessary to have huge test data inventories, reflecting the heterogeneous live system. Although the maintenance of large data stores can be guided by advice obtained from data ...

Nowadays, social networks are attracting more and more users. These social network subscribers may share personal and sensitive information with a large number of possibly unknown other users, which is in constant evolution. This raises the need of ...

Privacy concerns in many application domains prevents sharing of data, which limits data mining technology to identify patterns and trends from large amount of data. Traditional data mining algorithms have been developed within a centralized model. ...

Information search and document retrieval from a remote database (e.g. cloud server) requires submitting the search terms to the database holder. However, the search terms may contain sensitive information that must be kept secret from the database ...

Citizens demand more and more data for making decisions in their daily life. Therefore, mechanisms that allow citizens to understand and analyze linked open data (LOD) in a user-friendly manner are highly required. To this aim, the concept of Open ...

This paper presents techniques for tailoring linked data exploration by relying on the use of high-level, intuitive organization structures called inClouds (information Clouds). Techniques based on content filtering and relevance filtering are proposed ...

Many approaches have been defined to link data items automatically. Nevertheless, when data are numerous and when the schema is unknown, most of these approaches are too time-consuming. We propose an approach where classification rules are learnt thanks ...

The advent of contemporary mobile devices and their increasing computing power and location capabilities combined with the most innovative Web technologies has provided mobile users with new possibilities to share experiences on-the-go. The growing ...

The Web of Linked Data grows rapidly and already contains data originating from hundreds of data sources. The quality of data from those sources is very diverse, as values may be out of date, incomplete or incorrect. Moreover, data sources may provide ...

Nowadays, Renewable Energy Sources (RES) are attracting more and more interest. Thus, many countries aim to increase the share of green energy and have to face with several challenges (e.g., balancing, storage, pricing). In this paper, we address the ...

Next-generation DNA sequencing machines are generating a very large amount of sequence data with applications in many scientific challenges and placing unprecedented demands on traditional single-processor bioinformatics algorithms. Middleware and ...

Cloud computing has been massively adopted recently in many applications for its elastic scaling and fault-tolerance. At the same time, given that the amount of available RDF data sources on the Web increases rapidly, there is a constant need for ...

In classical databases, query performance is casually achieved through physical data structures such as caches, indexes and materialized views. In this context, many cost models help select a "best set" of such data structures. However, this selection ...

With the rise of cloud-computing and cloud-scale data management the importance of shipping the code of an application to its data has increased tremendously. Especially when offering data analytics on top of traditional relational databases as a ...

In order to be a useful tool, a Web Warehouse (WW) should take into account the quality of the data it manages and the quality of the services that provide the source data. It should also have enough flexibility to endure the high volatility of web ...

Advances in the Internet of Things will provide massive amounts of context-aware information that would need to be ingested and understood by supporting IT infrastructures, influencing running processes that trigger actions. As a result, future Business ...

Nowadays, social networking services, such as Facebook, Google+ or Twitter, have been drawing increasing attention from everyday users to research and industrial communities worldwide. The success of these social networking services provides a wealth of ...

Current Web technologies enable an active role of users, who can create and share their contents very easily. This mass of information includes opinions about a variety of key interest topics and represents a new and invaluable source of marketing ...