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Information overload that we as individuals daily face, represents a major challenge for the future society. The research goal of the DISG group is to offer novel solutions for serving information to people in an effective and nonintrusive way from the vast data cloud while taking into account (mobile) context, information needs and preferences as well as real-time data properties.


Distributed Information Systems Group (DISG) is a research group within the Department of Telecommunications, Faculty of Electrical Engineering and Computing (FER), University of Zagreb.

DISG group members: Prof. Ivana Podnar Žarko (group leader), Asst. Prof. Krešimir Pripužić, Aleksandar Antonić (PhD student) and Martina Marjanović (PhD student)

Research topics are within the area of large-scale distributed systems with a focus on scalability-related issues, in particular, Big Data processing in the context of (mobile) Internet of Things, recommender systems, and information retrieval in decentralized environments.

Published: 2014-09-02 at 00:37
Edited: 2014-09-05 at 17:08
Workshop on Interoperability and...

Workshop on Interoperability and Open-Source Solutions for the Internet of Things

Date: September 18, 2014 (a full-day workshop)

In conjunction with SoftCOM 2014

Venue: Radisson Blu Resort, Put Trstenika 19, HR-21000, Split, CROATIA



The workshop is organised by the high-profile OpenIoT project with support from the European Commission under the 7th framework Programme.

Invited Speakers

  • Bill Weinberg, Senior Director, Open Source Strategy Consulting at Black Duck Software
    Open Source Strategies for Driving the IoT
  • Markus Weinberger, Director of Bosh IoT Lab
    Business Ecosystems for the IoT

Workshop registration

Workshop participants are kindly requested to register in advance by completing and submitting the Online Registration Form.

Registration fee: 65.63 EUR (including tax and fees)

SoftCOM registration fee includes the Workshop registration fee and thus conference participants are welcome to attend the workshop at no additional cost.

Workshop program is available here.

Ivana Podnar Žarko
Published: 2014-05-22 at 16:52

Paper on IoT Data Management Methods and Optimisation Algorithms for Mobile Publish/Subscribe Services in Cloud Environments is accepted for publication and presentation at the European Conference on Networks and Communications, Bologna, Italy.

Ivana Podnar Žarko, Krešimir Pripužić, Martin Serrano, Manfred Hauswirth. IoT Data Management Methods and Optimisation Algorithms for Mobile Publish/Subscribe Services in Cloud Environments, to appear in EuCNC’2014 Conference Proceedings (will be available in IEEE Xplore), June 2014.

Ivana Podnar Žarko
Published: 2014-02-13 at 17:24

OpenIoT project  (https://github.com/OpenIotOrg/openiot/wiki) has been selected / voted among the top ten (rookies) open source  projects of 2013 see:



The selection has been made by Black Duck, which offers  award-winning software and consulting services, relating to open source software adoption, governance and management. Founded in 2002, Black Duck is headquartered near Boston and has offices in San Mateo, St. Louis, London, Paris, Frankfurt, Hong Kong, Tokyo, Seoul and Beijing.

Ivana Podnar Žarko
Published: 2013-08-27 at 12:27
Best local paper award at ISCC'13


Our paper "Inferring Presence Status on Smartphones: The Big Data Perspective" by Aleksandar Antonić, Ivana Podnar Žarko and Domagoj Jakobović has been awarded as

“the best local paper within the 18th IEEE Symposium on Computers and Communications (ISCC’13)”.

Congratulations to Aleksandar for the great paper presentation!

Ivana Podnar Žarko
Published: 2013-07-08 at 14:17
Edited: 2013-07-08 at 14:27
Paper on Mobile Crowdsensing accepted...


Paper on mobile crowdsensing is accepted for publication at the 1st International Workshop on Pervasive Urban Crowdsensing Architecture and Applications (PUCAA), collocated with with Ubicomp 2013.

We apply our Mobile Publish/Subscribe middleware (MoPS) for energy-efficient and context-aware orchestration of the sensing process with data transmission from sensors through mobile devices into the cloud, as well as from the cloud to mobile devices such that information of interest is served to users in real-time.

Ivana Podnar Žarko, Aleksandar Antonić, Krešimir Pripužić. Publish/Subscribe Middleware for Energy-Efficient Mobile Crowdsensing, to appear in UbiComp'13 Adjunct, September 8--12, 2013, Zurich, Switzerland. http://dx.doi.org/10.1145/2494091.2499577

Ivana Podnar Žarko
Published: 2013-05-28 at 13:32

On June 1st, 2013 we are joining as a new partner the project OpenIoT - Open Source Solution for the Internet of Things into the Cloud funded under the EU FP7 programme.

OpenIoT investigates efficient ways to formulate and manage an IoT based cloud environments i.e. environments comprising IoT “entities” and resources (such as sensors, actuators and smart devices) that offer utility-based (i.e. pay-as-you-go) IoT services.

Within OpenIoT DISG focuses on the following research topics:

  • Mobility aspects of internet connected objects for energy-efficient data harvesting;

  • Publish/subscribe mechanisms for efficient continuous processing and filtering of sensor data streams in the cloud environment.

Ivana Podnar Žarko
Published: 2013-04-29 at 15:28
Edited: 2013-04-29 at 15:29
New version of MAXtv Recommender...

We have successfully deployed an extended version of MAXtv Recommender which now recommends a list of titles per different movie categories.

The service is available to all MAXtv users :-)

Ivana Podnar Žarko
Published: 2013-04-29 at 15:22

Paper on learning and inferring user presence status on smartphones for non intrusive and energy-efficient maintenance of presence status without user intervention is accepted for publication at IEEE Symposium on Computers and Communications (ISCC 2013). We apply the Mobile Data Challenge (MDC) data set collected during the Lausanne Data Collection Campaign in our evaluations.

Aleksandar Antonić, Ivana Podnar Žarko, Domagoj Jakobović. Inferring Presence Status on Smartphones: The Big Data Perspective, to appear in IEEE Symposium on Computers and Communications, Split, Croatia, July 2013.

Ivana Podnar Žarko
Published: 2012-11-05 at 18:30
Edited: 2012-11-05 at 22:10
MAXtv Recommender successfully...

DISG members have developed and successfully deployed an IPTV recommender system, MAXtv recommender, in collaboration with Croatian Telecom. MAXtv recommender selects personalized recommendations from MAXtv Video Store, the largest IPTV video store in Croatia with a large user base.

Promotional video can be viewed on YouTube.

Ivana Podnar Žarko
Published: 2012-11-05 at 18:11
Edited: 2012-11-05 at 22:11
Best student paper award at MIPRO 2012


MS students Maria Brbić i Eugen Rožić have received the best student paper award at the 35th International Convention MIPR0 2012, Opatija, Croatia, for their paper Recommendation of YouTube Videos.

Congratulations to Maria and Eugen!

Ivana Podnar Žarko
Published: 2012-11-05 at 17:59
Paper Accepted for Publication in IS


Paper on distributed publish/subscribe systems with continuous top-k subscriptions accepted for publication in Information Systems (Elsevier).

Krešimir PripužićIvana Podnar Žarko and Karl Aberer:
"Top-k/w publish/subscribe: A publish/subscribe model for continuous top-k processing over data streams".

Ivana Podnar Žarko