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155 results on '"Matijasevic, Maja"'

1. The Effect of TCP Variants on the Coexistence of MMORPG and Best-Effort Traffic

Author

Saldana, Jose, Suznjevic, Mirko, Sequeira, Luis, Fernandez-Navajas, Julian, Matijasevic, Maja, and Ruiz-Mas, Jose

Subjects
Computer Science - Networking and Internet Architecture, Computer Science - Multimedia, Computer Science - Performance
Abstract

We study TCP flows coexistence between Massive Multiplayer Online Role Playing Games (MMORPGs) and other TCP applications, by taking World of Warcraft (WoW) and a file transfer application based on File Transfer Protocol (FTP) as an example. Our focus is on the effects of the sender buffer size and FTP cross-traffic on the queuing delay experienced by the (MMORPG) game traffic. A network scenario corresponding to a real life situation in an ADSL access network has been simulated by using NS2. Three TCP variants, namely TCP SACK, TCP New Reno, and TCP Vegas, have been considered for cross-traffic. The results show that TCP Vegas is able to maintain a constant rate while competing with the game traffic, since it prevents packet loss and high queuing delays by not increasing the sender window size. TCP SACK and TCP New Reno, on the other hand, tend to continuously increase the sender window size, thus potentially allowing higher packet loss and causing undesired delays for the game traffic. In terms of buffer size, we have established that smaller buffers are better for MMORPG applications, while larger buffers contribute to a higher overall delay.

Published
2020
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2. Analysis of player's in-game performance vs rating: Case study of Heroes of Newerth

Author

Caplar, Neven, Suznjevic, Mirko, and Matijasevic, Maja

Subjects
Physics - Physics and Society, Computer Science - Social and Information Networks, Physics - Data Analysis, Statistics and Probability, Physics - Popular Physics
Abstract

We evaluate the rating system of "Heroes of Newerth" (HoN), a multiplayer online action role-playing game, by using statistical analysis and comparison of a player's in-game performance metrics and the player rating assigned by the rating system. The datasets for the analysis have been extracted from the web sites that record the players' ratings and a number of empirical metrics. Results suggest that the HoN's Matchmaking rating algorithm, while generally capturing the skill level of the player well, also has weaknesses, which have been exploited by players to achieve a higher placement on the ranking ladder than deserved by actual skill. In addition, we also illustrate the effects of the choice of the business model (from pay-to-play to free-to-play) on player population., Comment: 8 pages, 14 figures, to appear in proceedings of "Foundation of Digital Games 2013" conference (14-17 May 2013)

Published
2013

3. Surveying the Social, Smart and Converged TV Landscape: Where is Television Research Headed?

Author

Montpetit, Marie-Jose, Cesar, Pablo, Matijasevic, Maja, Liu, Zhu, Crowcroft, John, and Martinez-Bonastre, Oscar

Subjects
Computer Science - Multimedia
Abstract

The TV is dead motto of just a few years ago has been replaced by the prospect of Internet Protocol (IP) television experiences over converged networks to become one of the great technology opportunities in the next few years. As an introduction to the Special Issue on Smart, Social and Converged Television, this extended editorial intends to review the current IP television landscape in its many realizations: operator-based, over-the-top, and user generated. We will address new services like social TV and recommendation engines, dissemination including new paradigms built on peer to peer and content centric networks, as well as the all important quality of experience that challenges services and networks alike. But we intend to go further than just review the existing work by proposing areas for the future of television research. These include strategies to provide services that are more efficient in network and energy usage while being socially engaging, novel services that will provide consumers with a broader choice of content and devices, and metrics that will enable operators and users alike to define the level of service they require or that they are ready to provide. These topics are addressed in this survey paper that attempts to create a unifying framework to link them all together. Not only is television not dead, it is well alive, thriving and fostering innovation and this paper will hopefully prove it., Comment: 18 pages, 1 figure

Published
2012

5. Online Charging Based on Machine Context for M2M Communication in LTE

Author

Maric, Ranko, Grgic, Tomislav, Matijasevic, Maja, Lovrek, Ignac, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Aguayo-Torres, Mari Carmen, editor, Gómez, Gerardo, editor, and Poncela, Javier, editor

Published
2015
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6. Q-POINT: QoE-Driven Path Optimization Model for Multimedia Services

Author

Dobrijevic, Ognjen, Kassler, Andreas J., Skorin-Kapov, Lea, Matijasevic, Maja, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Mellouk, Abdelhamid, editor, Fowler, Scott, editor, Hoceini, Saïd, editor, and Daachi, Boubaker, editor

Published
2014
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8. Agent-Based Framework for Personalized Service Provisioning in Converged IP Networks

Author

Podobnik, Vedran, Matijasevic, Maja, Lovrek, Ignac, Skorin-Kapov, Lea, Desic, Sasa, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Kowalczyk, Ryszard, editor, Vo, Quoc Bao, editor, Maamar, Zakaria, editor, and Huhns, Michael, editor

Published
2009
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9. Modeling of a QoS Matching and Optimization Function for Multimedia Services in the NGN

Author

Skorin-Kapov, Lea, Matijasevic, Maja, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Pfeifer, Tom, editor, and Bellavista, Paolo, editor

Published
2009
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11. End-to-End QoS Signaling for Future Multimedia Services in the NGN

Author

Skorin-Kapov, Lea, Matijasevic, Maja, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Dough, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Koucheryavy, Yevgeni, editor, Harju, Jarmo, editor, and Iversen, Villy B., editor

Published
2006
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12. Interactive Visualization of Grid Monitoring Data on Multiple Client Platforms

Author

Skorin-Kapov, Lea, Pandžić, Igor, Matijašević, Maja, Komerički, Hrvoje, Mošmondor, Miran, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Sloot, Peter M. A., editor, Hoekstra, Alfons G., editor, Priol, Thierry, editor, Reinefeld, Alexander, editor, and Bubak, Marian, editor

Published
2005
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13. SWSD: A P2P-Based System for Service Discovery from a Mobile Terminal

Author

Ramljak, Darije, Matijašević, Maja, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Khosla, Rajiv, editor, Howlett, Robert J., editor, and Jain, Lakhmi C., editor

Published
2005
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14. Improving Search on WWW.HR Web Directory by Introducing Ontologies

Author

Gledec, Gordan, Matijašević, Maja, Jurić, Damir, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Khosla, Rajiv, editor, Howlett, Robert J., editor, and Jain, Lakhmi C., editor

Published
2005
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20. A framework for multiuser distributed virtual environments

Author

Matijasevic, Maja, Gracanin, Denis, Valavanis, Kimon P., and Lovrek, Ignac

Abstract

A framework for multiuser distributed virtual environments (DVEs) has been proposed. The proposed framework, incorporating two models, the functional model and the interconnection model, attempts to represent common functionality, communication issues, and requirements found in multiuser DVEs. The functional model concentrates on the DVE functionality, while the interconnection model concentrates on how the components are interconnected to realize the required functionality. The models have been specified using the Unified Modeling Language. An experimental case study demonstrates the applicability and generality of the proposed approach. Index Terms--Distributed simulation, distributed virtual environment, modeling, networked virtual environment, virtual reality.

Published
2002

22. Guest Editorial

Author

Matijasevic, Maja and Pejcinovic, Branimir

Published
2006

25. Analyzing the effect of TCP and server population on massively multiplayer games

Author

Suznjevic, Mirko, Saldana, Jose, Matijasevic, Maja, Fernandez-Navajas, Julian, and Ruiz-Mas, Jose

Subjects
File servers -- Usage -- Analysis -- Models, Online games -- Usage -- Analysis -- Models, Transmission Control Protocol/Internet Protocol (Computer network protocol)
Abstract

Many Massively Multiplayer Online Role-Playing Games (MMORPGs) use TCP flows for communication between the server and the game clients. The utilization of TCP, which was not initially designed for (soft) real-time services, has many implications for the competing traffic flows. In this paper we present a series of studies which explore the competition between MMORPG and other traffic flows. For that aim, we first extend a source-based traffic model, based on player's activities during the day, to also incorporate the impact of the number of players sharing a server (server population) on network traffic. Based on real traffic traces, we statistically model the influence of the variation of the server's player population on the network traffic, depending on the action categories (i.e., types of in-game player behaviour). Using the developed traffic model we prove that while server population only modifies specific action categories, this effect is significant enough to be observed on the overall traffic. We find that TCP Vegas is a good option for competing flows in order not to throttle the MMORPG flows and that TCP SACK is more respectful with game flows than other TCP variants, namely, Tahoe, Reno, and New Reno. Other tests show that MMORPG flows do not significantly reduce their sending window size when competing against UDP flows. Additionally, we study the effect of RTT unfairness between MMORPG flows, showing that it is less important than in the case of network-limited TCP flows., 1. Introduction Massively Multiplayer Online Role-Playing Games (MMORPGs) have become one of the most profitable genres in the gaming industry. The leading MMORPG in the market, namely, World of Warcraft [...]

Published
2014
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26. Why MMORPG players do what they do: relating motivations to action categories

Author

Suznjevic, Mirko and Matijasevic, Maja

Subjects
Human acts -- Analysis, Human behavior -- Analysis, Motivation (Psychology) -- Analysis, Multiplayer online games -- Analysis, Mass communications
Abstract

Byline: Mirko Suznjevic, Maja Matijasevic This paper presents an analysis of relations between player motivation and behaviour in a Massively Multiplayer Online Role-Playing Game (MMORPG). Player motivation is measured in terms of percentile ranks of motivational components for MMORPG players defined by Nick Yee. Player behaviour is described through previously defined action categories for MMORPGs (Trading, Questing, Dungeons, Raiding, Player versus Player Combat, and Communication). We conduct a player survey and perform measurements on the client side for a group of 104 players of World of Warcraft. Additionally we examine the importance of both voice and textual communication in MMORPGs.

Published
2010

27. ConTEL 2009: the 10th international conference on telecommunications

Author

Matijasevic, Maja

Subjects
Telecommunications services industry, Wireless technology, Information science -- Conferences, meetings and seminars, Telecommunications services industry -- Conferences, meetings and seminars, Communications industry -- Conferences, meetings and seminars, Mobile communication systems -- Conferences, meetings and seminars, Wireless communication systems -- Conferences, meetings and seminars
Published
2009

29. Foreword

Author

Matijasevic, Maja, primary, Leitgeb, Erich, additional, Kusek, Mario, additional, and Gojmerac, Ivan, additional

Published
2017
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37. QoE-Driven Path Optimization Model for Multimedia Services

Author

Dobrijevic, Ognjen, Kassler, Andreas, Skorin-Kapov, Lea, Matijasevic, Maja, Dobrijevic, Ognjen, Kassler, Andreas, Skorin-Kapov, Lea, and Matijasevic, Maja

Abstract

When delivering multimedia services over Internet, different media types are impacted by resource limitations in a different way. While an interactive audio service calls for low-latency communication, video streams should be routed over network paths with sufficient capacity. However, in current networks flows towards the same destination follow the same path, which may lead to a suboptimal resource utilization that effectively penalizes end-users' quality of experience (QoE). This paper proposes Q-POINT, a QoE-driven path optimization model to fairly maximize aggregated end-user QoE for competing clients' service flows by calculating the best path for each flow, subject to resource constraints. We formulate the problem as a mixed integer linear program integrating QoE models for audio, video and data transfer. Such an approach can be leveraged within the software-defined networking paradigm, which provides a control plane to orchestrate path set-up. We evaluate our model and illustrate its benefits over shortest path selection.

Published
2014

41. Urban crowd sensing demonstrator: Sense the Zagreb Air

Author

Antonic, Aleksandar, primary, Bilas, Vedran, additional, Marjanovic, Martina, additional, Matijasevic, Maja, additional, Oletic, Dinko, additional, Pavelic, Marko, additional, Zarko, Ivana Podnar, additional, Pripuzic, Kresimir, additional, and Skorin-Kapov, Lea, additional

Published
2014
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42. Quality Evaluation in Peer-to-Peer IPTV Services

Author

Biersack, Ernst, Callegari, Christian, Matijasevic, Maja, Mu, Mu, Knowles, William, Georgopoulos, Panagiotis, Simpson, Steven, Cerqueira, Eduardo, Race, Nicholas, Mauthe, Andreas, Hutchison, David, Biersack, Ernst, Callegari, Christian, Matijasevic, Maja, Mu, Mu, Knowles, William, Georgopoulos, Panagiotis, Simpson, Steven, Cerqueira, Eduardo, Race, Nicholas, Mauthe, Andreas, and Hutchison, David

Abstract

Modern IPTV services are comprised of multiple comprehensive service elements in the entire content delivery chain to maximise the efficiency in networking. Audio-visual content may experience various types of impairments during content ingest, processing, distribution and reception.While some impairments do not cause noticeable distortions to the delivered content, many others such as the network transmission loss can be highly detrimental to the user experience in content consumption. In order to optimise service quality and to provide a benchmarking platform to evaluate the designs for future audio-visual content distribution system, a quality evaluation framework is essential. We introduce such an evaluation framework to assess video service with respect of user perception, while supporting service diagnosis to identify root-causes of any detected quality degradation. Compared with existing QoE frameworks, our solution offers an advanced but practical design for the real-time analysis of IPTV services in multiple service layers.

Published
2013

43. Towards QoE-driven Multimedia Service Negotiation and Path Optimization with Software Defined Networking

Author

Kassler, Andreas, Dely, Peter, Skorin-Kapov, Lea, Dobrijevic, Ognjen, Matijasevic, Maja, Kassler, Andreas, Dely, Peter, Skorin-Kapov, Lea, Dobrijevic, Ognjen, and Matijasevic, Maja

Abstract

This paper presents motivation and ongoing work towards a system for Quality of Experience (QoE)-driven path assignment for multimedia services. The system goal is to enable negotiation of service and network communication parameters between end-users and to assign the network paths that are used for delivering multimedia flows according to the agreed service configuration. The key concept behind the system is a centralized multi-user optimization of the path assignments, which maximizes QoE by taking into account service utility functions, network topology, link capacities, and delay. Based on the output of the optimization process, the system implementation uses the OpenFlow to set up forwarding paths for the network elements, ACROSS

Published
2012

44. Quality of Experience based optimization of heterogeneous multimedia sessions in IMS

Author

Brajdic, Agata, Kassler, Andreas, Matijasevic, Maja, Brajdic, Agata, Kassler, Andreas, and Matijasevic, Maja

Abstract

For delivering multimedia services over (wireless) networks it is important that the mechanisms which negotiate and optimize content delivery under resource constraints take into account user perceived quality in order to improve user satisfaction. Within the scope of the IP Multimedia Subsystem (IMS) architecture a novel application server may be added which handles multi-user multi-flow Quality of Experience (QoE) negotiation and adaptation for heterogeneous user sessions. Based on a mathematical model, which takes into account the characteristics of audio, video and data sessions for QoE optimization, we develop several optimization algorithms to be used by the application server to maximize overall user defined QoE parameters for all ongoing multimedia sessions, subject to network resource constraints. Our results show that a greedy based approach provides a reasonable compromise in terms of run-time and sub-optimality for the overall QoE based resource allocations.

Published
2011
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