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Online social media services, such as Facebook and Twitter, have set new standards on how people interact with each other online, share their everyday activities, and media services. While current mobile services supporting social interaction are typically primarily for remote communication, similar services can be introduced to co-located social(More)
We study a novel type of a semi-supervised anomaly detection problem where the anomalies occur collectively among a background of normal data. Such problem arises in experimental high energy physics when one is trying to discover deviations from known Standard Model physics. We solve the problem by first fitting a mixture of Gaussians to a labeled(More)
Open source software development has been the subject of interest among businesses as well as in the academic world. OSS enables many possibilities for companies but also sets new kinds of challenges. Because of the characteristics of the OSS phenomenon we propose that trust in OSS communities plays a key role in facilitating their success. Therefore, the(More)
Several success stories of open source (OS) products have been seen during last decade. Due to the economical importance of the products, it is important to know who are the ones who have the largest influence to the products. Is there a dominant player in developing communities? In this paper 1 the aspect is studied with respect to the Linux Kernel(More)
Complex computer systems are seldom made from scratch but they contain significant amounts of legacy code, which then is under continuous pressure for evolution. Therefore, a need for a rigorous method for managing evolution in this setting is evident. We propose a management method for reactive and distributed systems. The method is based on creating a(More)