The large size of most data warehouses (typically hundreds of gigabytes to terabytes), which results in non-trivial storage costs, makes compression techniques attractive for warehousing environments. In particular, block-level compression (as opposed to attribute or record level schemes) has been shown to achieve the greatest reductions in storage size for databases. A key issue is how to quic...

Online analysis of large volumes of data consists an important part of today's business and scientific applications. Storing structured data in data warehouses following a multidimensional storage model provides efficient and reliable access to it. Distributed systems have become the first choice to cope with the increasing volume and complexity of data warehouses. In order keep up with this tr...

The Competence Center for Medical Data Warehousing and Analysis (MEDAN) will be established as a four-year competence center in the Database and Information Systems (DIS) group in the Faculty of Computer Science at the Free University of Bozen-Bolzano (FUB). The creation of this competence center has been triggered by a strategic project at Hospital Meran (HM) with the aim of realizing a data w...

The performance of OLAP queries can be improved drastically if the warehouse data is properly selected and indexed. The problems of selecting and materializing views and indexing data have been studied extensively in the data warehousing environment. On the other hand, data partitioning can also greatly increase the performance of queries. Data partitioning has advantage over data selection and...

In a data warehousing process, mastering the data preparation phase allows substantial gains in terms of time and performance when performing multidimensional analysis or using data mining algorithms. Furthermore, a data warehouse can require external data. The web is a prevalent data source in this context. In this paper, we propose a modeling process for integrating diverse and heterogeneous ...

BACKGROUND Phthorimaea operculella is a key pest of potato. The authors characterised the P. operculella olfactory system, selected the most bioactive host plant volatiles and evaluated their potential application in pest management. The electrophysiological responses of olfactory receptor neurons (ORNs) housed in long sensilla trichodea of P. operculella to plant volatiles and the two main sex...

There is growing use of wood pellet and wood chip boilers in the UK. Elsewhere fatalities have been reported, caused by carbon monoxide poisoning following entry into wood pellet storage areas. The aim of this work was to obtain information on how safely these two fuels are being stored in the UK. Site visits were made to six small-scale boiler systems and one large-scale pellet warehouse, to a...

PT XYZ merupakan salah satu perusahaan manufaktur yang memproduksi mesin linting rokok dan pengemas rokok. Keadaan tata letak fasilitas di saat ini tidak berdasarkan suatu perancangan efisien sehingga menjadi penghambat pergerakan pekerja dalam menjalankan tugasnya membutuhkan waktu lama untuk proses pengambilan pengeluaran material warehouse. Dengan menggunakan metode class based storage pemak...

introduction oil storage tanks are one of the most important industrial facilities that are exposed to risks of toxic substances release, fire and explosion. fire is a common risk and explosion is the most important risk at the oil storage tanks and petroleum products. in research with applications in chemical risk assessment that was published in 2007, causes risk in the hands of the industrie...

multi-echelon inventory systems are one of the most important and attractive areas in modelling supply chain management so that several researches and studies have been done about. in this paper, the total cost function of a two-echelon inventory system with central warehouse and many identical retailers controlled by continuous review inventory policy is estimated. we have assumed the demand i...