Big Data Systems

Big Data and Recommender Systems

Big Data Quality: From Content to Context

Over the last 20 years, and particularly with the advent of Big Data and analytics, the research area around Data and Information Quality (DIQ) is still a fast growing research area. There are many views and streams in DIQ research, generally aiming at improving the effectiveness of decision making in organizations. Although there are a lot of researches aimed at clarifying the role of BIG data...

Big Data: Understanding Big Data

Steve Jobs, one of the greatest visionaries of our time was quoted in 1996 saying “a lot of times, people don’t know what they want until you show it to them”[38] indicating he advocated products to be developed based on human intuition rather than research. With the advancements of mobile devices, social networks and the Internet of Things (IoT) enormous amounts of complex data, both structure...

Big Data Uses in Crowd Based Systems

There are currently many trends in computer science, like Smart Cities, Internet of Things, and Wireless Sensor Networks. Many of these systems require or could dramatically benefit from having information about crowds. First of all, many of the systems are built to improve the life of people, and they require information about them to be able to know when to activate their functionality in ord...

Design Challenges in Big Data Systems

Graph pattern matching is a fundamental operation for many applications, and it is exhaustively studied in its classical forms. Nevertheless, there are newly emerging applications, like analyzing hyperlinks of the web graph and analyzing associations in a social network, that need to process massive graphs in a timely manner. Regarding the extremely large size of these graphs and knowledge they...