Krešimir Pripužić

University of Zagreb · Faculty of Electrical Engineering and Computing (FER)

The prediction of future weather patterns has recently become a very important research area due to the ongoing climate change process which causes extreme weather events and rapidly changing weather patterns. In this paper we compare the prediction accuracy of eight data-driven methods, which had been developed for time series prediction, on futur...

Publish/subscribe is a messaging pattern where message producers, called publishers, publish messages which they want to be distributed to message consumers, called subscribers. Subscribers are required to subscribe to messages of interest in advance to be able to receive them upon the publishing. In this paper, we discuss a special type of publish...

Cloud of Things (CoT) is a novel concept driven by the synergy of the Internet of Things (IoT) and cloud computing paradigm. The CoT concept has expedited the development of smart services resulting in the proliferation of their real world deployments. However, new research challenges arise because of the transition of research-driven and proof-of-...

Mobile crowd sensing (MCS) is a novel class of mobile Internet of Things (IoT) applications for community sensing where sensors and mobile devices jointly collect and share data of interest to observe phenomena over a large geographic area. The inherent device mobility and high sensing frequency has the capacity to produce dense and rich spatiotemp...

The ACM DEBS Grand Challenge 2015 focuses on real-time analytics over a high volume geospatial data stream composed of taxi trip reports from New York City. The goal of the challenge is to provide a solution which continuously identifies the most frequent routes (query 1) and most profitable areas (query 2) for taxis in New York City. The solution...

A sliding window top-k (top-k/w) query monitors incoming data stream objects within a sliding window of size w to identify the k best-ranked objects with respect to a given scoring function over time. Processing of such queries is challenging because, even when an object is not a top-k/w object at the time when it enters the processing system, it m...

Given the prominence of IoT applications integrating mobile Internet-connected objects (ICOs), e.g., wearable sensors and mobile devices with built-in sensors, novel solutions are required to discover and collect data from mobile sensors producing data streams from varying locations, while taking into account sensor accuracy, energy-efficiency, and...

We demonstrate an urban crowd sensing application for monitoring air quality by use of specially-designed wearable sensors and mobile phones. The application is built upon the OpenIoT platform1 with the goal to support context-aware and energy-efficient acquisition and filtering of sensor data in mobile environments while ensuring adequate sensing...

This book constitutes the thoroughly refereed post-conference proceedings of the International Workshop on Interoperability and Open-Source Solutions for the Internet of Things, FP7 OpenIot Project, held in Conjunction with SoftCOM 2014, in Split, Croatia, in September 2014. The 11 revised full papers presented together with the extended abstracts...

We are witnessing the rise of a novel class of wearable devices equipped with various sensing capabilities as well as further miniaturization of sensing components that are nowadays being integrated into mobile devices. The inherent mobility of such devices has the capacity to produce dense and rich spatiotemporal information about our environment...

We demonstrate an urban crowd sensing application for monitoring air quality by use of specially-designed wearable sensors and mobile phones. The application is built upon the OpenIoT platform\footnote{The EU FP7 project OpenIoT is the winner of the Open Source Rookie of the Year 2013. For more information visit www.openiot.eu} with the goal to sup...

We are witnessing the rise of a novel class of wearable devices equipped with various sensing capabilities as well as further miniaturization of sensing components that are nowadays being integrated into mobile devices. The inherent mobility of such devices has the capacity to produce dense and rich spatiotemporal information about our environment...

Recent advances in the Internet of Things (IoT) domain for deploying IoT data systems within the cloud have generated Internet-connected silos of sensor technology which make the collection and processing of sensor-generated information more complex. A viable solution to this problem is the use of local sub-servers acting as collector's hubs betwee...

Continuous processing of top-k queries over data streams is a promising technique for alleviating the information overload problem as it distinguishes relevant from irrelevant data stream objects with respect to a given scoring function over time. Thus it enables filtering of irrelevant data objects and delivery of top-k objects relevant to user in...

In this paper we focus on mobile crowdsensing applications for community sensing where sensors and mobile devices jointly collect and share data of interest to observe and measure phenomena over a larger geographic area. Such applications, e.g., environmental monitoring or crowdsourced traffic monitoring, involve numerous individuals that on the on...

Internet Protocol Television (IPTV) is an increasingly popular multimedia service which is used to deliver television, video, audio and other interactive content over proprietary IP-based networks. Video on Demand (VoD) is one of the most popular IPTV services, and is very important for IPTV providers since it represents the second most important r...

The goal of this white paper is to describe representative usage scenarios and their corresponding requirements, as well as state-of-the-art technological solutions and open research directions for key functionalities related to content-centric architectures for networks of moving objects. The usage scenarios presented include smart transport, data...

A sliding-window k-NN query (k-NN/w query) continuously monitors incoming data stream objects within a sliding window to identify k closest objects to a query. It enables effective filtering of data objects streaming in at high rates from potentially distributed sources, and offers means to control the rate of object insertions into result streams....

Presence information - expressing user willingness and ability to communicate with other users across a set of devices and tools - represents an essential prerequisite for real-time communications. Although presence-related protocols have primarily emerged in conjunction with instant messaging systems, presence is today viewed as a primer service o...

This paper describes the methodological and or-ganizational aspects of teaching on a project man-agement course. A specific feature of the course is its simultaneous olfer to graduate students of both electrical engineering and computing. We apply an approach in teaching where students work in a client-oriented project environment that is closely r...

Although they sometimes seem harmless, hoaxes represent not-negligible threat to individuals’ awareness of real-life situations by deceiving them, and at the same time doing harm to the image of their organizations, which can lead to substantial financial losses. Spreading of hoaxes also influences the normal operating regime of networks and the ef...

Wireless sensor networks are widely used in environmental applications, like forest fire detection. Although forest fires occur relatively rarely, their number is increasing in Europe in the last years, so their manifestation must be early detected in order to prevent higher damages. To minimize needless communication between the sensor nodes for t...

Existing content-based publish/subscribe systems are designed assuming that all matching publications are equally relevant to a subscription. As we cannot know in advance the distribution of publication content, the following two unwanted situations are highly possible: a subscriber either receives too many or only few publications. In this paper w...

Existing content-based publish/subscribe systems are designed assuming that all matching publications are equally relevant to a subscription. As we cannot know in advance the distribution of publication content, the following two unwanted situations are highly possible: a subscriber either receives too many or only few publications. In this paper w...

Project management helps accomplish the common purpose of a project with defined requirements and desired quality. Teaching project management for graduate and undergraduate students requires combining optimal foundation in theory with maximal usability in practice, as well as project management tools support. Finding an optimal balance between the...

The foundation of successful software product development today is establishing an effective and efficient teamwork. In order to manage large software development projects it is needed to manage and coordinate virtual teams of programmers, engineers, business analysts and other project stakeholders. Trust is required for effective team communicatio...

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