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2 2018

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The recommendation algorithm for an online art gallery

Karwowski W., Sosnowska J., Rusek M.

Information Systems in Management

2018

Vol. 7, No. 2

108--119

The paper discusses the need for recommendations and the basic recommendation systems and algorithms. In the second part the design and implementation of the recommender system for online art gallery (photos, drawings, and paintings) is presented. The designed customized recommendation algorithm is based on collaborative filtering technique using the similarity between objects, improved by information from user profile. At the end conclusions of performed algorithm are formulated.

Integration of queries to heterogeneous data sources using linq technology

Rusek M., Maguza J., Karwowski W.

Information Systems in Management

2018

Vol. 7, No. 3

180--189

Nowadays, the data are available in a variety of formats such as relational database tables, xml files, rdf files or simply text files. Database systems have their own query languages and tools for the manipulation of data. On the other hand, most of today's applications are created in languages based on the object-oriented paradigm. From the level of the programming language it is important to use different sources of data in a uniform manner. The paper discusses the elements of the various query languages such as SQL XQuery or SPARQL. And then shows the capabilities of LINQ and its role in the creation of abstract data access layer. Then the possibilities of LINQ extension are discussed. As the example, design and implementation of LINQ provider for Allegro is presented.