OLAP is a popular technology to query scientific and statistical databases, but their success heavily depends on a proper design of the underlying multidimensional (MD) databases (i.e., based on the fact / dimension paradigm). Relevantly, different approaches to automatically identify facts are nowadays available, but all MD design methods rely on discovering functional dependencies (FDs) to id...

In this paper we investigate some issues and solutions related to the design of a Data Warehouse (DW), storing several aggregate measures about trajectories of moving objects. First we discuss the loading phase of our DW which has to deal with overwhelming streams of trajectory observations, possibly produced at different rates, and arriving in an unpredictable and unbounded way. Then, we focus...

Abstract In the context of multi-criteria decision making every individual will act as a decision maker. The decision maker is involved in assigning preferences or weights to the alternatives. Goal programming will also come under the hub of MCDA, where the DM will assign the subjective weights to each goal. By giving so, the weighted sum of deviations will be minimized to some extent but one c...

Logistics customer service is an important factor in the success of supply chain management. The aim of this study is to propose a novel approach for customer service management. For the improvement of logistics service operations, the proposed method integrates quality function development (QFD), fuzzy extended analytic hierarchy process (FEAHP), and multi-segment goal programming (MSGP). The ...

On-Line Analytical Processing (OLAP) dimensions are usually modelled as a hierarchical set of categories (the dimension schema), and dimension instances. The latter consist in a set of elements for each category, and relations between these elements (denoted rollup). To guarantee summarizability, a dimension is required to be strict, that is, every element of the dimension instance must have a ...

There are increasing global demands for environmental friendly products. Green Quality Function Deployment – III (GQFD – III) is an innovative tool aiding in the development of environmentally conscious products and processes. An improved version of GQFD – III, Green Quality Function Deployment – IV (GQFD – IV) has been developed in this study. Its improvement over GQFD – III is that the life c...

For more than a decade, researches on OLAP and multidimensional databases have generated methodologies, tools and resource management systems for the analysis of numeric data. With the growing availability of digital documents, there is a need for incorporating text-rich documents within multidimensional databases as well as an adapted framework for their analysis. This paper presents a new agg...

On-Line Analytical Processing (OLAP) is a trend in database technology, which was recently introduced and has attracted the interest of a lot of research work. OLAP is based on the multidimensional view of data, supported either by multidimensional databases (MOLAP) or relational engines (ROLAP). In this paper we propose a model for multidimensional databases. Dimensions, dimension hierarchies ...

We present the application of multifunctional nanoparticles in microfluidic devices. The particles have an oxygen sensing function and can be collected by magnetic forces at any desired position in the microfluidic channels. The nanoparticles are prepared by a simple precipitation technique. Read-out of the in situ generated sensor spots was performed applying luminescence lifetime and ratio me...

An analytical solution for calculating the residence time of fluid flowing toward a pumping well in an unconfined aquifer has been developed. The analytical solution was derived based on a radial, steady-state, Dupuit-Forchheimer flow model. The resulting integral expression involved computing the imaginary error function, for which a simple series expansion is proposed. The validity of the ana...