| Büch D and Esch M (2023), “CiTe: A Testbed for Smart City Applications and Architectures”, In 2023 IEEE International Conference on Omni-layer Intelligent Systems (COINS). , pp. 1-6. |
BibTeX:
@inproceedings{10189229,
author = {Büch, Dominic and Esch, Markus},
title = {CiTe: A Testbed for Smart City Applications and Architectures},
booktitle = {2023 IEEE International Conference on Omni-layer Intelligent Systems (COINS)},
year = {2023},
pages = {1-6},
doi = {10.1109/COINS57856.2023.10189229}
}
|
| Rocha LEC, Singh V, Esch M, Lenaerts T, Liljeros F and Thorson A (2020), “Dynamic contact networks of patients and MRSA spread in hospitals”, Scientific Reports 10, 2020, 9336. Vol. 10(9336) Nature Publishing Group. |
| Abstract: Methicillin-resistant Staphylococcus aureus (MRSA) is a difficult-to-treat infection that only in the European Union affects about 150,000 patients and causes extra costs of 380 million Euros annually to the health-care systems. Increasing efforts have been taken to mitigate the epidemics and to avoid potential outbreaks in low endemic settings. Understanding the population dynamics of MRSA through modeling is essential to identify the causal mechanisms driving the epidemics and to generalize conclusions to different contexts. We develop an innovative high-resolution spatiotemporal contact network model of interactions between patients to reproduce the hospital population in the context of the Stockholm County in Sweden and simulate the spread of MRSA within this population. Our model captures the spatial and temporal heterogeneity caused by human behavior and by the dynamics of mobility within wards and hospitals. We estimate that in this population the epidemic threshold is at about 0.008. We also identify that these heterogeneous contact patterns cause the emergence of super-spreader patients and a polynomial growth of the epidemic curve. We finally study the effect of standard intervention control strategies and identify that screening is more effective than improved hygienic in order to cause smaller or null outbreaks. |
BibTeX:
@article{,
author = {Luis E C Rocha, Vikramjit Singh, Markus Esch, Tom Lenaerts, Fredrik Liljeros, Anna Thorson},
title = {Dynamic contact networks of patients and MRSA spread in hospitals},
journal = {Scientific Reports 10, 2020, 9336},
publisher = {Nature Publishing Group},
year = {2020},
volume = {10},
number = {9336},
doi = {10.1038/s41598-020-66270-9}
}
|
| Singh V, Esch M and Scholtes I (2016), “Decentralized Cluster Detection in Distributed Systems Based on Self-Organized Synchronization”, In Proceedings of 10th IEEE International Conference on Self-Adaptive and Self-Organizing Systems, SASO 2016, Augsburg, Germany, September 12-16, 2016. , pp. 146-147. IEEE Computer Society. |
| Abstract: In this work, we propose a method for the decentralized detection of clusters, or communities, in large-scale networked systems. Different from other approaches that require global knowledge of the network topology, the proposed method is based on a fully decentralized protocol and allows a node to infer knowledge about the community memberships of its nearest neighbours. It relies on the fact that topological characteristics of a network leave traces in the evolution of a self-organized synchronization process. The preliminary results presented in this report show a promising detection accuracy and justify a further investigation of our approach. |
BibTeX:
@inproceedings{DBLP:conf/saso/SinghES16,
author = {Vikramjit Singh and Markus Esch and Ingo Scholtes},
editor = {Giacomo Cabri and Gauthier Picard and Niranjan Suri},
title = {Decentralized Cluster Detection in Distributed Systems Based on Self-Organized Synchronization},
booktitle = {Proceedings of 10th IEEE International Conference on Self-Adaptive and Self-Organizing Systems, SASO 2016, Augsburg, Germany, September 12-16, 2016},
publisher = {IEEE Computer Society},
year = {2016},
pages = {146--147},
doi = {10.1109/SASO.2016.23}
}
|
| Kudla T, Esch M, Ota D and Schwarz G (2015), “An open process for software development in classified environments as prerequisite for military app stores”, In Proceedings of 2015 International Conference on Military Communications and Information Systems (ICMCIS), Cracow, Poland, May 2015. , pp. 1-9. |
BibTeX:
@inproceedings{7158673,
author = {Kudla, Thomas and Esch, Markus and Ota, Daniel and Schwarz, Gerhard},
title = {An open process for software development in classified environments as prerequisite for military app stores},
booktitle = {Proceedings of 2015 International Conference on Military Communications and Information Systems (ICMCIS), Cracow, Poland, May 2015},
year = {2015},
pages = {1-9},
doi = {10.1109/ICMCIS.2015.7158673}
}
|
| Clemens Landsberg ME (2015), “Enterprise Architecture-Based Service Portfolio Management for Automated Service Catalog Generation”, In Proceedings of Fifth International Symposium on Business Modeling and Software Design (BMSD 2015), Milan, Italy, July 2015.
[BibTeX] |
BibTeX:
@inproceedings{Landsberg2015EnterpriseAS,
author = {Clemens Landsberg, Markus Esch},
title = {Enterprise Architecture-Based Service Portfolio Management for Automated Service Catalog Generation},
booktitle = {Proceedings of Fifth International Symposium on Business Modeling and Software Design (BMSD 2015), Milan, Italy, July 2015},
year = {2015}
}
|
| Coote R, Rein K, Esch M and Schade U (2015), “Towards a mobile context-sensitive framework for interoperability and improved situational awareness in crisis and emergency management”, In Proceedings of 10th Future Security Research Conference, Berlin, Germany, September 2015.
[BibTeX] |
BibTeX:
@inproceedings{Coote2015,
author = {Ravi Coote, Kellyn Rein, Markus Esch, Ulrich Schade},
title = {Towards a mobile context-sensitive framework for interoperability and improved situational awareness in crisis and emergency management},
booktitle = {Proceedings of 10th Future Security Research Conference, Berlin, Germany, September 2015},
year = {2015}
}
|
| Esch M, Geppert H, Gerz M and Ota D (2013), “Anforderungscontrolling für die einsatzbezogenen IT-Systeme der Bundeswehr”, Mittler IT-Report.
[BibTeX] |
BibTeX:
@article{Esch2013,
author = {Markus Esch, Hanna Geppert, Michael Gerz, Daniel Ota},
title = {Anforderungscontrolling für die einsatzbezogenen IT-Systeme der Bundeswehr},
journal = {Mittler IT-Report},
year = {2013}
}
|
| Ota D, Esch M, Geppert H and Gerz M (2013), “Architecture Assessment by Cross-Sectional Requirements”, In Proceedings of NATO Symposium on Architecture Assessment for NEC (SCI-254), Tallinn, Estonia, May 2013.
[BibTeX] |
BibTeX:
@inproceedings{Ota2013,
author = {Daniel Ota, Markus Esch, Hanna Geppert, Michael Gerz},
title = {Architecture Assessment by Cross-Sectional Requirements},
booktitle = {Proceedings of NATO Symposium on Architecture Assessment for NEC (SCI-254), Tallinn, Estonia, May 2013},
year = {2013}
}
|
| Blondel VD, Esch M, Chan C, Clérot F, Deville P, Huens E, Morlot F, Smoreda Z and Ziemlicki C (2012), “Data for Development: the D4D Challenge on Mobile Phone Data”, CoRR. Vol. abs/1210.0137 |
BibTeX:
@article{DBLP:journals/corr/abs-1210-0137,
author = {Vincent D. Blondel and Markus Esch and Connie Chan and Fabrice Clérot and Pierre Deville and Etienne Huens and Frédéric Morlot and Zbigniew Smoreda and Cezary Ziemlicki},
title = {Data for Development: the D4D Challenge on Mobile Phone Data},
journal = {CoRR},
year = {2012},
volume = {abs/1210.0137},
url = {http://arxiv.org/abs/1210.0137}
}
|
| Esch M, Kovacheva A, Scholtes I and Rothkugel S (2011), “TweetGames: A framework for twitter-based collaborative social online games”, In Proceedings of 7th International Conference on Collaborative Computing: Networking, Applications and Worksharing, CollaborateCom 2011, Orlando, FL, USA, 15-18 October, 2011., 10, 2011. , pp. 436-442. ICST / IEEE. |
| Abstract: Today social networks and microblogging services attract much attention and their importance and pervasion is constantly increasing. This trend is fostered by the increasing prevalence of mobile internet devices, which enable users to be online every time and everywhere. A popular kind of applications provided via social network platforms are games. While existing social network games basically realize common online game principles where each user controls a single game entity and acts on its own behalf, this paper presents a framework for the creation of a novel kind of social online games. The idea is to enable games where users do not act as individual game entities, instead groups of users control one game entity whose behavior emerges from the collective behavior of all group members. The framework is based on the microblogging service Twitter and users interact with the game via Twitter messages. These collaborative social online games are not just an innovative social network application, the intention of our framework is rather to provide a useful and powerful tool to complex social network researchers to study emergent and collective user behavior on a large scale utilizing the huge user base of a social network service like Twitter. In addition to presenting the idea of collaborative social online games along with the so-called TweetGame framework, this paper presents a sample application that has already been realized on top of this framework as proof of concept. |
BibTeX:
@inproceedings{Esch2011,
author = {Markus Esch and Aleksandrina Kovacheva and Ingo Scholtes and Steffen Rothkugel},
editor = {Dimitrios Georgakopoulos and James B. D. Joshi},
title = {TweetGames: A framework for twitter-based collaborative social online games},
booktitle = {Proceedings of 7th International Conference on Collaborative Computing: Networking, Applications and Worksharing, CollaborateCom 2011, Orlando, FL, USA, 15-18 October, 2011},
publisher = {ICST / IEEE},
year = {2011},
pages = {436--442},
doi = {10.4108/icst.collaboratecom.2011.247127}
}
|
| Kirsch L, Esch M and Rothkugel S (2011), “The Snippet System – Fine-Granular Management of Documents and their Relationships”, In Proceedings of the 6th International Conference on Human Computer Interaction (HCI 2011), Washington, D.C., USA, May 2011., 5, 2011. |
| Abstract: In this paper the concept of the Snippet System is presented. By breaking up the rigid and inflexible way today’s operating systems store data in files and hierarchical folder structures, the Snippet System is able to provide efficient data handling and organization facilities. Semantic relationships are used for the identification, retrieval and display of related data in a context-sensitive fashion. The entire approach is supported by novel graphical user interface elements fostering intuitive interaction. Consequently, user experience is improved by reducing the cognitive load of information management considerably. |
BibTeX:
@inproceedings{Kirsch2011TheSS,
author = {Laurent Kirsch and M. Esch and S. Rothkugel},
title = {The Snippet System - Fine-Granular Management of Documents and their Relationships},
booktitle = {Proceedings of the 6th International Conference on Human Computer Interaction (HCI 2011), Washington, D.C., USA, May 2011},
year = {2011}
}
|
| Esch M (2010), “Federated and Scalable Network Overlay Approaches for Global-scale Interactive Applications”. Thesis at: University of Luxembourg., 12, 2010.
[BibTeX] |
BibTeX:
@phdthesis{,
author = {Markus Esch},
title = {Federated and Scalable Network Overlay Approaches for Global-scale Interactive Applications},
school = {University of Luxembourg},
year = {2010}
}
|
| Botev J, Esch M, Schloss H, Scholtes I and Sturm P (2010), “HyperVerse: simulation and testbed reconciled”, Int. J. Adv. Media Commun.., 12, 2010. Vol. 4(2), pp. 167-181. |
| Abstract: When dealing with dynamic large-scale topologies such as those underlying Peer-to-Peer (P2P) Distributed Virtual Environments (DVEs), one inescapably reaches the point where either: a) simulations lack human behaviour and assessment or where b) practical experiments on a small scale do not yield significant results. The restrictions resulting from the separation of simulation and testbed environments hinder a comprehensive assessment and efficient development of adaptive algorithms and techniques for DVEs as they are investigated in our HyperVerse research project. In this paper, we present a hybrid evaluation system designed to combine the advantages of simulations and testbeds. The proposed infrastructure exhibits great flexibility particularly alluring in view of the multitude of potential research in the context of DVEs. |
BibTeX:
@article{DBLP:journals/ijamc/BotevESSS10,
author = {Jean Botev and Markus Esch and Hermann Schloss and Ingo Scholtes and Peter Sturm},
title = {HyperVerse: simulation and testbed reconciled},
journal = {Int. J. Adv. Media Commun.},
year = {2010},
volume = {4},
number = {2},
pages = {167--181}
}
|
| Esch M and Tobias E (2010), “Decentralized Scale-Free Network Construction and Load Balancing in Massive Multiuser Virtual Environments”, In Proceedings of the 2010 6th International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom 2010), Chicago, IL, USA, October 2010. USA, 10, 2010. , pp. 1–10. IEEE Computer Society. |
BibTeX:
@inproceedings{10.4108/icst.collaboratecom.2010.58,
author = {Esch, M and Tobias, E},
title = {Decentralized Scale-Free Network Construction and Load Balancing in Massive Multiuser Virtual Environments},
booktitle = {Proceedings of the 2010 6th International Conference on Collaborative Computing: Networking, Applications and Worksharing (CollaborateCom 2010), Chicago, IL, USA, October 2010},
publisher = {IEEE Computer Society},
year = {2010},
pages = {1–10},
doi = {10.4108/icst.collaboratecom.2010.58}
}
|
| Esch M and Botev J (2010), “Distance-Aware Avatar Interaction in Online Virtual Environments”, In 2010 Second International Conference on Advances in Future Internet., 7, 2010. , pp. 56-62. IEEE. |
| Abstract: Immersive Massive Multiuser Virtual Environments currently attract a lot of attention. Going beyond the hype, one discovers interesting concepts and opportunities for a supposed future Web which is commonly called the 3D Web. The global provision of such a vision is much more than another evolutionary step in content visualization, rather severe technical challenges need to be addressed by the future Internet infrastructure and protocols. Existing commercial approaches feature only limited scalability due to mostly relying on centralized solutions. With global-scale scenarios like a 3D Web in mind, the application of distributed and decentralized techniques becomes indispensable. In the HyperVerse project we have developed a two-tier Peer-To-Peer architecture, incorporating a federation of reliable server machines and user clients as basic infrastructure for an open and scalable 3D Web. Based on this federated infrastructure a hybrid avatar management scheme has been proposed that reduces the server load considerably. Using this scheme, servers get unburdened especially in highly populated regions of an online environment. Moreover, the flash crowd problem is tackled in a self-scaling fashion. This paper presents a series of improvements of this avatar management scheme, focusing not only on reducing server load, but also latency, client and overall network load. These improvements are achieved through utilizing free server capacities and considering the real-world distance between communicating nodes to minimize network traffic. |
BibTeX:
@inproceedings{5558191,
author = {Esch, Markus and Botev, Jean},
title = {Distance-Aware Avatar Interaction in Online Virtual Environments},
booktitle = {2010 Second International Conference on Advances in Future Internet},
publisher = {IEEE},
year = {2010},
pages = {56-62},
doi = {10.1109/AFIN.2010.18}
}
|
| Scholtes I, Botev J, Esch M and Sturm P (2010), “Epidemic Self-Synchronization in Complex Networks of Kuramoto oscillators”, Adv. Complex Syst.., 5, 2010. Vol. 13(1), pp. 33-58. |
| Abstract: In this article, we present and evaluate an epidemic scheme for the synchronization of coupled Kuramoto oscillators in communication networks. It addresses the problem of efficiently providing globally synchronous time epochs in complex, dynamic Peer-to-Peer network topologies. Rather than the usual model of continuously coupled nodes, a discretized version with sporadic message-based couplings to nearest neighbors is considered. This article empirically studies the emergence of coherent oscillator states for different network topologies, coupling functions, and sporadic coupling intensities. It further investigates the protocol’s minimum bandwidth requirements in small-world network topologies. Synchronization resilience under the effect of random perturbations is studied for two coupling variations. Finally, the potential utilization of the scheme for a local inference of global network topology characteristics is discussed. |
BibTeX:
@article{DBLP:journals/advcs/ScholtesBES10,
author = {Ingo Scholtes and Jean Botev and Markus Esch and Peter Sturm},
title = {Epidemic Self-Synchronization in Complex Networks of Kuramoto oscillators},
journal = {Adv. Complex Syst.},
year = {2010},
volume = {13},
number = {1},
pages = {33--58},
doi = {10.1142/S0219525910002426}
}
|
| Esch M and Scholtes I (2010), “Resilience and Multicast Aspects of the Structured Network Overlay GP3”, In Proceedings of CISIS 2010, The Fourth International Conference on Complex, Intelligent and Software Intensive Systems, Krakow, Poland, 15-18 February 2010., 2, 2010. , pp. 1117-1122. IEEE Computer Society. |
| Abstract: Today Massive Multiuser Virtual Environments (MMVEs) are for the most part realized in a centralized fashion. While this provides advantages in terms of manageability and controllability to the providers, it is not feasible for a global-scale scenario like a 3D Web. In order to provide such a global-scale virtual environment it is indispensable to utilize P2P technologies. Within the HyperVerse project, we have developed and recently presented a two-tier Peer-to-Peer (P2P) architecture that incorporates a loosely structured P2P overlay of user peers and a highly structured overlay of server machines, constituting a reliable backbone service. For the interconnection of this backbone servers we proposed a structured P2P overlay named GP3. It has been shown, that this overlay allows efficient join and node lookup operations and allows for the reference locality in virtual environments. This paper studies the GP3 algorithm with respect to multicast aspects as well as resilience against node failures. |
BibTeX:
@inproceedings{DBLP:conf/cisis/EschS10,
author = {Markus Esch and Ingo Scholtes},
editor = {Leonard Barolli and Fatos Xhafa and Salvatore Vitabile and Hui-Huang Hsu},
title = {Resilience and Multicast Aspects of the Structured Network Overlay GP3},
booktitle = {Proceedings of CISIS 2010, The Fourth International Conference on Complex, Intelligent and Software Intensive Systems, Krakow, Poland, 15-18 February 2010},
publisher = {IEEE Computer Society},
year = {2010},
pages = {1117--1122},
doi = {10.1109/CISIS.2010.127}
}
|
| Esch M, Ooi WT and Scholtes I (2009), “Evaluation of the HyperVerse Avatar Management Scheme Based on the Analysis of Second Life Traces”, In Proceedings of the 15th International Conference on Parallel and Distributed Systems (ICPADS 2009), Shenzhen, China, December 2009., 12, 2009. , pp. 692-699. IEEE. |
| Abstract: Massive multiuser virtual environments (MMVEs) and the idea of a global scale 3D Web have grown popular in recent years. While commercial precursors of such environments for the most part rely on centralized client/server architectures, it is commonly accepted that a global scale virtual online world can only be realized in a distributed fashion. Within the HyperVerse project, we have developed and recently presented a two-tier Peer-to-Peer (P2P) architecture that incorporates a loosely structured P2P overlay of user peers and a highly structured overlay of server machines constituting a reliable backbone service. In such a distributed environment, an essential question is how avatars are tracked and interconnected in order to allow mutual rendering and interaction. We have previously proposed a hybrid avatar management scheme that utilizes the backbone service for avatar tracking if necessary, but handles tracking in a P2P fashion when peers can track each other to reduce the backbone load. This paper presents a detailed performance analysis of this algorithm under a realistic scenario, using traces from a large scale MMVE called Second Life. Moreover this paper presents and evaluates an optimization for the hybrid avatar tracking scheme that can be utilized under a weaker condition. |
BibTeX:
@inproceedings{5395528,
author = {Esch, Markus and Ooi, Wei Tsang and Scholtes, Ingo},
title = {Evaluation of the HyperVerse Avatar Management Scheme Based on the Analysis of Second Life Traces},
booktitle = {Proceedings of the 15th International Conference on Parallel and Distributed Systems (ICPADS 2009), Shenzhen, China, December 2009},
publisher = {IEEE},
year = {2009},
pages = {692-699},
doi = {10.1109/ICPADS.2009.61}
}
|
| Esch M and Scholtes I (2009), “A scale-free and self-organized P2P overlay for massive multiuser virtual environments”, In Proceedings of the 5th International Conference on Collaborative Computing (CollaborateCom 2009), Washington, D.C., USA, November 2009., 11, 2009. , pp. 1-10. IEEE. |
| Abstract: Massive Multiuser Virtual Environments have recently grown popular, and commercial virtual online worlds like Second Life or World of Warcraft attract a lot of attention. In this context, for the research on distributed systems, especially the idea of a 3D Web as a global scale virtual environment is very interesting, since it poses severe technical challenges to the underlying infrastructure. It is generally accepted, that the realization of such a global scale scenario can not be realized in a traditional centralized fashion. For this reason in the course of the HyperVerse project we have developed a two-tier Peer-to-Peer (P2P) architecture as basic infrastructure for a federated and scalable 3D Web. Our approach relies on a concept, that incorporates a loosely-structured P2P overlay of user clients and an overlay that connects a federation of reliable server machines constituting a reliable backbone service. This paper proposes a self-organized and scale-free network overlay for the reliable backbone in the HyperVerse architecture. The overlay incorporates advantages of scale-free networks, self-organization and epidemic aggregation in order to tackle the severe challenges of the scenario in a fully distributed fashion without any central control. |
BibTeX:
@inproceedings{5362669,
author = {Esch, Markus and Scholtes, Ingo},
title = {A scale-free and self-organized P2P overlay for massive multiuser virtual environments},
booktitle = {Proceedings of the 5th International Conference on Collaborative Computing (CollaborateCom 2009), Washington, D.C., USA, November 2009},
publisher = {IEEE},
year = {2009},
pages = {1-10},
doi = {10.4108/ICST.COLLABORATECOM2009.8279}
}
|
| Bettinger C, Oechsle R, Esch M, Schloss H and Sturm P (2009), “Evaluation of P2P overlays for AoI management in Distributed Virtual Environments”, In Proceedings of the International Conference on Ultra Modern Telecommunications, ICUMT 2009, 12-14 October 2009, St. Petersburg, Russia., 10, 2009. , pp. 1-6. IEEE. |
| Abstract: Client/Server-based DVE approaches incur scalability and load balancing problems while addressing massive number of users. In order to mitigate these problems P2P overlays are proposed for content provision and management issues instead. However, content provision and management in a distributed manner is much more complicated and requires an exhaustive study of overlay network properties. In order to investigate which kinds of overlay networks suit the requirements stated by DVEs at best, we have performed a comparative evaluation of the deterministic DHT-based Tapestry overlay and the nondeterministic prefix-tree-based P-Grid overlay considering their data location performance and construction cost. In this paper we discuss these evaluation results and exemplarily show how AoI management and content provision can be realized by using the P-Grid overlay. |
BibTeX:
@inproceedings{DBLP:conf/icumt/BettingerOESS09,
author = {Christian Bettinger and Rainer Oechsle and Markus Esch and Hermann Schloss and Peter Sturm},
title = {Evaluation of P2P overlays for AoI management in Distributed Virtual Environments},
booktitle = {Proceedings of the International Conference on Ultra Modern Telecommunications, ICUMT 2009, 12-14 October 2009, St. Petersburg, Russia},
publisher = {IEEE},
year = {2009},
pages = {1--6},
doi = {10.1109/ICUMT.2009.5345537}
}
|
| Schloss H, Scholtes I, Botev J, Esch M, Höhfeld A and Sturm P (2009), “Fuzzy Logic supported Consistency Management in DDVEs”, Electron. Commun. Eur. Assoc. Softw. Sci. Technol.., 9, 2009. Vol. 17 |
| Abstract: In distributed virtual environments, where avatars permanently change their properties (e.g. their position) or perform modifications on shared objects, inconsistent states may occur due to message latency or concurrent updates. Here, the consistency often falls prey to high interactivity and responsiveness demands. To minimize the presence of inconsistent states or data, the Elastic Consistency model aims at providing an optimal trade-off between consistency and system responsiveness. In this paper we present a Fuzzy Logic driven approach for the computation of this trade-off on the basis of environmental characteristics at the application runtime. Furthermore, we evaluate the impacts of this parameter on consistency and system responsiveness by adjusting the behavior of a classic mutual exclusion algorithm. In this paper we show that an acceptable degree of consistency with respect to required system responsiveness can be efficiently achieved, even when addressing a large number of users. |
BibTeX:
@article{DBLP:journals/eceasst/SchlossSBEHS09,
author = {Hermann Schloss and Ingo Scholtes and Jean Botev and Markus Esch and Alexander Höhfeld and Peter Sturm},
title = {Fuzzy Logic supported Consistency Management in DDVEs},
journal = {Electron. Commun. Eur. Assoc. Softw. Sci. Technol.},
year = {2009},
volume = {17},
doi = {10.14279/tuj.eceasst.17.202}
}
|
| Esch M, Botev J, Schloss H and Scholtes I (2009), “Performance Evaluation of GP3 – A Grid-Based Spatial Index Infrastructure”, In Proceedings of Sixth International Conference on Information Technology: New Generations, ITNG 2009, Las Vegas, Nevada, USA, 27-29 April 2009., April, 2009. , pp. 663-670. IEEE Computer Society. |
| Abstract: Looking at the evolution of the Internet in recent years one can observe that massive multiuser virtual environments(MMVEs) have grown increasingly popular. Especially the idea of a rdquo3D Webrdquo as a combination of a MMVE and todaypsilas WWW provides a lot of exciting opportunities in terms of user experience and interactivity. From an infrastructural perspective, the global provision of such a scenario is much more than another evolutionary step in content visualization. Such a 3D Web rather poses severe technical challenges to the underlying infrastructure, especially with respect to scalability. The HyperVerse project aims at the provision of a globally scalable federated infrastructure being able to handle these requirements. One component of this infrastructure is the structured peer-to-peer overlay GP3. This paper presents a detailed performance evaluation of this overlay network, providing simulation results as well as formal proofs for the upper bound complexity. |
BibTeX:
@inproceedings{DBLP:conf/itng/EschBSS09,
author = {Markus Esch and Jean Botev and Hermann Schloss and Ingo Scholtes},
editor = {Shahram Latifi},
title = {Performance Evaluation of GP3 - A Grid-Based Spatial Index Infrastructure},
booktitle = {Proceedings of Sixth International Conference on Information Technology: New Generations, ITNG 2009, Las Vegas, Nevada, USA, 27-29 April 2009},
publisher = {IEEE Computer Society},
year = {2009},
pages = {663--670},
doi = {10.1109/ITNG.2009.40}
}
|
| Botev J, Esch M, Schloss H, Scholtes I and Sturm P (2009), “HyperVerse: Simulation and Testbed Reconciled”, In Proceedings of the 2nd International Workshop on Massively Multiuser Virtual Environments (MMVE 2009) at IEEE Virtual Reality 2009, Lafayette, LA, USA, March 2009., 3, 2009.
[BibTeX] |
BibTeX:
@inproceedings{Scholtes2014,
author = {Jean Botev, Markus Esch, Hermann Schloss, Ingo Scholtes, Peter Sturm},
title = {HyperVerse: Simulation and Testbed Reconciled},
booktitle = {Proceedings of the 2nd International Workshop on Massively Multiuser Virtual Environments (MMVE 2009) at IEEE Virtual Reality 2009, Lafayette, LA, USA, March 2009},
year = {2009}
}
|
| Esch M, Botev J, Schloss H and Scholtes I (2009), “P2P-Based Avatar Interaction in Massive Multiuser Virtual Environments”, In Proceedings of the 3th International Conference on Complex, Intelligent and Software Intensive Systems (CISIS 2009), Fukuoka, Japan, March 2009., 3, 2009. , pp. 977-982. IEEE Computer Society. |
| Abstract: The idea of the 3D Web as a global scale Distributed Virtual Environment (DVE) currently is very popular and a lot of research work is done in this field. In the course of the HyperVerse project we have developed a two-tier Peer-To-Peer (P2P) architecture as basic infrastructure for a federated, open and scalable 3D Web. Our approach relies on a concept that incorporates a loosely-structured P2P network overlay of user clients and a highly-structured overlay that connects a federation of reliable server machines constituting a reliable backbone service. A central problem when intending to build a massive virtual online environment is how avatar interaction as well as tracking and provision of avatar positions can be realized in a globally scalable manner. This paper presents a hybrid avatar interaction scheme developed for HyperVerse that incorporates the user clients and the backbone service for avatar position tracking. The backbone is used as reliable fall-back service, while the avatar tracking is handled in a pure P2P fashion whenever possible. This way backbone overload is prevented in a self-organizing manner whenever client density tends to overburden the backbone infrastructure. |
BibTeX:
@inproceedings{DBLP:conf/cisis/EschBSS09,
author = {Markus Esch and Jean Botev and Hermann Schloss and Ingo Scholtes},
editor = {Leonard Barolli and Fatos Xhafa and Hui-Huang Hsu},
title = {P2P-Based Avatar Interaction in Massive Multiuser Virtual Environments},
booktitle = {Proceedings of the 3th International Conference on Complex, Intelligent and Software Intensive Systems (CISIS 2009), Fukuoka, Japan, March 2009},
publisher = {IEEE Computer Society},
year = {2009},
pages = {977--982},
doi = {10.1109/CISIS.2009.19}
}
|
| Scholtes I, Botev J, Esch M and Sturm P (2009), “Epidemic Self-synchronization in Complex Networks”, In Proceedings of the 1st International Conference on Complex Sciences: Theory and Applications (Complex’ 2009), Shanghai, China, February 2009. Vol. 5, pp. 1794-1809. Springer. |
| Abstract: In this article we present and evaluate an epidemic algorithm for the synchronization of coupled Kuramoto oscillators in complex network topologies. The algorithm addresses the problem of providing a global, synchronous notion of time in complex, dynamic Peer-to-Peer topologies. For this it requires a periodic coupling of nodes to a single random one-hop-neighbor. The strength of the nodes’ couplings is given as a function of the degrees of both coupling partners. We study the emergence of self-synchronization and the resilience against node failures for different coupling strength functions and network topologies. For Watts/Strogatz networks, we observe critical behavior suggesting that small-world properties of the underlying topology are crucial for self-synchronization to occur. From simulations on networks under the effect of churn, we draw the conclusion that special coupling functions can be used to enhance synchronization resilience in power-law Peer-to-Peer topologies. |
BibTeX:
@inproceedings{DBLP:conf/complex/ScholtesBES09,
author = {Ingo Scholtes and Jean Botev and Markus Esch and Peter Sturm},
title = {Epidemic Self-synchronization in Complex Networks},
booktitle = {Proceedings of the 1st International Conference on Complex Sciences: Theory and Applications (Complex' 2009), Shanghai, China, February 2009},
publisher = {Springer},
year = {2009},
volume = {5},
pages = {1794--1809}
}
|
| Botev J, Schloss H, Esch M and Scholtes I (2008), “GP3 – A Distributed Grid-Based Spatial Index Infrastructure for Massive Multiuser Virtual Environments”, In Proceedings of the 14th IEEE International Conference on Parallel and Distributed Systems (ICPADS 2008), Melbourne, Australia, December 2008. Los Alamitos, CA, USA, 12, 2008. , pp. 811-816. IEEE Computer Society. |
| Abstract: Massive Multiuser Virtual Environments (MMVEs) and especially the idea of a ”3D Web” as a combination of a MMVE and today’s WWW currently attracts a lot of attention. The realization of such a vision on a global scale though poses severe technical challenges to the underlying network infrastructure. It is generally accepted that such a global scale scenario can only be realized in a distributed fashion. The HyperVerse project aims at the provision of a federated global scalable infrastructure for such a ”3D Web” scenario. We propose a two-tier Peer-To-Peer infrastructure that combines a loosely structured overlay network of user clients with a highly-structured overlay network of reliable so-called public servers constituting the backbone of our architecture. This paper presents the Grid-based plane Partitioning Protocol (GP3), a structured peer-to-peer overlay network for the interconnection of the public servers that realizes a spatial index in order to allow fast location based queries. |
BibTeX:
@inproceedings{,
author = {J. Botev and H. Schloss and M. Esch and I. Scholtes},
title = {GP3 - A Distributed Grid-Based Spatial Index Infrastructure for Massive Multiuser Virtual Environments},
booktitle = {Proceedings of the 14th IEEE International Conference on Parallel and Distributed Systems (ICPADS 2008), Melbourne, Australia, December 2008},
publisher = {IEEE Computer Society},
year = {2008},
pages = {811-816},
doi = {10.1109/ICPADS.2008.13}
}
|
| Schloss H, Botev J, Höhfeld A, Scholtes I, Oechsle R and Esch M (2008), “HiOPS overlay – efficient provision of multicast in peer-to-peer systems”, In Proceedings of the 16th International Conference on Networks, ICON 2008, December 12-14, 2008, held at India Habitat Centre, New Delhi, India., 12, 2008. , pp. 1-6. IEEE. |
| Abstract: During the last few years the application scope of peer-to-peer systems has been notably extended. While the problems of scalable data localization have been exhaustively addressed, one may notice that the problem of multicast cost and latency delays in very large, global scale peer-to-peer networks still remains inadequately considered. Many large scale applications will suffer from this multicast cost if the number of users increases. In order to address this problem, we introduce HiOPS – a hierarchical two tier peer-to-peer system which provides a reasonable tradeoff between minimization of multicast cost and latency delays and reduction of maintenance and management cost. Because of its properties and characteristics HiOPS can be considered as a basic infrastructure for a wide range of peer-to-peer applications. |
BibTeX:
@inproceedings{DBLP:conf/icon/SchlossBHSOE08,
author = {Hermann Schloss and Jean Botev and Alexander Höhfeld and Ingo Scholtes and Rainer Oechsle and Markus Esch},
title = {HiOPS overlay - efficient provision of multicast in peer-to-peer systems},
booktitle = {Proceedings of the 16th International Conference on Networks, ICON 2008, December 12-14, 2008, held at India Habitat Centre, New Delhi, India},
publisher = {IEEE},
year = {2008},
pages = {1--6},
doi = {10.1109/ICON.2008.4772570}
}
|
| Botev J, Hohfeld A, Schloss H, Scholtes I, Sturm P and Esch M (2008), “The HyperVerse: Concepts for a Federated and Torrent-Based ‘3D Web'”, Int. J. Adv. Media Commun.. Geneva 15, CHE, 12, 2008. Vol. 2(4), pp. 331–350. |
| Abstract: The vision of a ‘3D Web’ as a combination of massive online virtual environments and today’s WWW currently attracts a lot of attention. While it provides a multitude of opportunities, the realisation of this vision on a global scale poses severe technical challenges. This paper points out some of the major challenges and highlights key concepts of an infrastructure that is being developed in order to meet them. Among these concepts, special emphasis is put on the usage of a two-tier Peer-to-Peer approach, the implementation of Torrent-based data distribution, and the development of a graded consistency notion. The paper presents the current state of a prototype implementation that is being developed in order to validate these concepts and evaluate alternative approaches. |
BibTeX:
@article{10.1504/IJAMC.2008.022219,
author = {Botev, Jean and Hohfeld, Alexander and Schloss, Hermann and Scholtes, Ingo and Sturm, Peter and Esch, Markus},
title = {The HyperVerse: Concepts for a Federated and Torrent-Based '3D Web'},
journal = {Int. J. Adv. Media Commun.},
year = {2008},
volume = {2},
number = {4},
pages = {331–350}
}
|
| Schloss H, Botev J, Esch M, Höhfeld A, Scholtes I and Sturm P (2008), “Elastic Consistency in Decentralized Distributed Virtual Environments”, In Proceedings of the 4th International Conference on Automated Solutions for Cross Media Content and Multi-channel Distribution (AXMEDIS 2008), Florence, Italy, November 2008., 11, 2008. , pp. 249-252. |
| Abstract: Distributed virtual environments like online games or 3D virtual worlds have become very popular in the last few years and a more substantial surge in popularity and use is expected. Because of the huge number of users, such environments will undergo a change of infrastructure from a centralized to a decentralized one, making higher demands on consistency issues. This paper addresses consistency problems which may occur in distributed virtual environments and introduces the elastic consistency model to tackle these problems. According to elastic consistency, different consistency levels setting up a trade-off between consistency and responsiveness of the environment should be introduced in order to provide an efficient way of interaction on a global scale. |
BibTeX:
@inproceedings{4688075,
author = {Schloss, Hermann and Botev, Jean and Esch, Markus and Höhfeld, Alex and Scholtes, Ingo and Sturm, Peter},
title = {Elastic Consistency in Decentralized Distributed Virtual Environments},
booktitle = {Proceedings of the 4th International Conference on Automated Solutions for Cross Media Content and Multi-channel Distribution (AXMEDIS 2008), Florence, Italy, November 2008},
year = {2008},
pages = {249-252},
doi = {10.1109/AXMEDIS.2008.26}
}
|
| Botev J, Esch M, Höhfeld A, Schloss H, Scholtes I and Sturm P (2008), “HyperVerse – Towards a Self-Organizing and Sustainable Global-Scale Virtual Environment”, In Proceedings of the 4th Microsoft Academic Days, Berlin, Germany, November 2008., 11, 2008.
[BibTeX] |
BibTeX:
@inproceedings{Botev20082,
author = {Jean Botev, Markus Esch, Alexander Höhfeld, Hermann Schloss, Ingo Scholtes, Peter Sturm},
title = {HyperVerse - Towards a Self-Organizing and Sustainable Global-Scale Virtual Environment},
booktitle = {Proceedings of the 4th Microsoft Academic Days, Berlin, Germany, November 2008},
year = {2008}
}
|
| Scholtes I, Botev J, Esch M, Schloss H and Sturm P (2008), “Using Epidemic Hoarding to Minimize Load Delays in P2P Distributed Virtual Environments”, In Proceedings of the 4th International Conference on Collaborative Computing (CollaborateCom 2008), Orlando, FL, USA, November 2008., 11, 2008. , pp. 578-593. Springer. |
| Abstract: Distributed Virtual Environments (DVEs) have grown popular in various fields of application. Apart from providing great collaborational opportunities in an immersive setting, large-scale DVEs pose severe scalability challenges. Although P2P approaches have proven to be effective for tackling many of these issues, still load delay problems remain in regions with high object or avatar density. In this article we present and evaluate a hoarding approach that is suitable to minimize such delays in P2P-based DVEs with a real-time distribution of dynamic data. The prediction of what data shall be hoarded is based on an epidemic aggregation algorithm working solely with local knowledge. Evaluation results that have been obtained using a DVE simulation environment will be presented. |
BibTeX:
@inproceedings{10.1007/978-3-642-03354-4_43,
author = {Scholtes, Ingo and Botev, Jean and Esch, Markus and Schloss, Hermann and Sturm, Peter},
title = {Using Epidemic Hoarding to Minimize Load Delays in P2P Distributed Virtual Environments},
booktitle = {Proceedings of the 4th International Conference on Collaborative Computing (CollaborateCom 2008), Orlando, FL, USA, November 2008},
publisher = {Springer},
year = {2008},
pages = {578--593}
}
|
| Scholtes I, Botev J, Höhfeld A, Schloss H and Esch M (2008), “Awareness-Driven Phase Transitions in Very Large Scale Distributed Systems”, In Proceedings of 2nd International Conference on Self-Adaptive and Self-Organizing Systems (SaSo 2008), Venice, Italy, October 2008., 10, 2008. , pp. 25-34. IEEE Computer Society. |
| Abstract: Recent research in the field of complex networks has shown that – beyond microscopic structural qualities – global statistical parameters are sufficient to describe a surprising number of their macroscopic properties. This article argues that such statistical parameters can be monitored by nodes in a decentralized and efficient way. The so achieved awareness of a network’s global parameters can be used by nodes for actively influencing them to optimize relevant characteristics of the overall network. For such an adaptation, the network-analogy of “phase transitions” in physical systems can be used. In this article the general concept of such an awareness-driven statistical adaptation is presented using power law networks as an example. For this important class of networks practical algorithms are introduced. Based on recent advances in reliable power law fitting, a gossip scheme has been developed which is suitable to make individual nodes aware of a power law network’s critical exponent. In order to influence this parameter, decentralized reconnection rules are presented. The combination of both strategies facilitates a feedback control of large scale systems’ emergent power law properties. |
BibTeX:
@inproceedings{4663407,
author = {Scholtes, Ingo and Botev, Jean and Höhfeld, Alexander and Schloss, Hermann and Esch, Markus},
title = {Awareness-Driven Phase Transitions in Very Large Scale Distributed Systems},
booktitle = {Proceedings of 2nd International Conference on Self-Adaptive and Self-Organizing Systems (SaSo 2008), Venice, Italy, October 2008},
publisher = {IEEE Computer Society},
year = {2008},
pages = {25-34},
doi = {10.1109/SASO.2008.49}
}
|
| Markus Esch Patrick Gratz SRJJISPS (2008), “CrePes – Warum und wie Schüler ab 8 Jahren Programmieren lernen sollten”, In DeLFI 2008: Die 6. e-Learning Fachtagung Informatik der Gesellschaft für Informatik e.V., 07. – 10. September 2008 in Lübeck, Germany., 9, 2008. Vol. {P-132}, pp. 413-424. GI. |
BibTeX:
@inproceedings{DBLP:conf/delfi/EschGRJSS08,
author = {Markus Esch, Patrick Gratz, Steffen Rothkugel, Jörg Jakoby, Ingo Scholtes, Peter Sturm},
editor = {Silke Seehusen and Ulrike Lucke and Stefan Fischer},
title = {CrePes - Warum und wie Schüler ab 8 Jahren Programmieren lernen sollten},
booktitle = {DeLFI 2008: Die 6. e-Learning Fachtagung Informatik der Gesellschaft für Informatik e.V., 07. - 10. September 2008 in Lübeck, Germany},
publisher = {GI},
year = {2008},
volume = {P-132},
pages = {413--424},
url = {https://dl.gi.de/20.500.12116/15025}
}
|
| Esch M, Botev J, Schloss H, Höhfeld A, Scholtes I and Zech B (2008), “SimCon – a simulation and visualization environment for overlay networks and large-scale applications”, In Proceedings of the 1st International Conference on Simulation Tools and Techniques for Communications, Networks and Systems & Workshops, SimuTools 2008, Marseille, France, March 3-7, 2008., 3, 2008. , pp. 68. ICST/ACM. |
| Abstract: A substantial number of massive large-scale applications require scalable underlying network topologies. Nowadays structured Peer-to-Peer overlay networks meet these requirements very well. But there is still a need to decide which of these overlay networks is most suitable for providing the best possible performance for a certain application. This paper describes SimCon – a simulation environment for overlay networks and large-scale applications. SimCon allows the comparison of different overlay networks with respect to predefined metrics derived from requirements of the considered application. This approach allows determining which overlay network meets the needs of a given application best, which in turn is a great support for developers of large-scale applications. |
BibTeX:
@inproceedings{DBLP:conf/simutools/EschBSHSZ08,
author = {Markus Esch and Jean Botev and Hermann Schloss and Alexander Höhfeld and Ingo Scholtes and Benjamin Zech},
editor = {Sándor Molnár and John R. Heath and Olivier Dalle and Gabriel A. Wainer},
title = {SimCon - a simulation and visualization environment for overlay networks and large-scale applications},
booktitle = {Proceedings of the 1st International Conference on Simulation Tools and Techniques for Communications, Networks and Systems & Workshops, SimuTools 2008, Marseille, France, March 3-7, 2008},
publisher = {ICST/ACM},
year = {2008},
pages = {68},
doi = {10.4108/ICST.SIMUTOOLS2008.3038}
}
|
| Botev J, Esch M, Höhfeld A, Schloss H and Scholtes I (2008), “The HyperVerse – Concepts for a Federated and Torrent-Based 3D Web”, In 1st International Workshop on Massively Multiuser Virtual Environments (MMVE 2008) at IEEE Virtual Reality, Reno, Nevada, USA, March 2008., 3, 2008.
[BibTeX] |
BibTeX:
@inproceedings{Botev2008,
author = {Jean Botev, Markus Esch, Alexander Höhfeld, Hermann Schloss, Ingo Scholtes},
title = {The HyperVerse - Concepts for a Federated and Torrent-Based 3D Web},
booktitle = {1st International Workshop on Massively Multiuser Virtual Environments (MMVE 2008) at IEEE Virtual Reality, Reno, Nevada, USA, March 2008},
year = {2008}
}
|
| Scholtes I, Botev J, Esch M, Höhfeld A, Schloss H and Zech B (2008), “TopGen – internet router-level topology generation based on technology constraints”, In Proceedings of the 1st International Conference on Simulation Tools and Techniques for Communications, Networks and Systems & Workshops, SimuTools 2008, Marseille, France, March 3-7, 2008., 3, 2008. , pp. 30. ICST/ACM. |
| Abstract: In order to realistically simulate algorithms or evaluate P2P overlay topologies, a detailed model of the underlying router topology is required. Since actively measuring this topology is extremely laborious and furthermore a waste of network resources, traditionally topology generators are used in order to create synthetic router-level graphs. For this, usually graph models are selected that are known to generate graphs which are similar to the actual Internet in respect to a certain metric like e.g. vertex degree distribution. These models are often superseded or adjusted when new metrics are being introduced which better differentiate between graphs. Furthermore it has been shown, that graphs that are similar in respect to e.g. vertex degree distribution can be very different from a structural point of view. In this paper Top-Gen, a generic, extensible and easy-to-use topology generation platform is presented. It contains a topology generation module which bases the generation of router-level graphs on the Internet’s underlying principles and the technological constraints of routers rather than trying to effectuate similarity in respect to a certain metric. Apart from describing TopGen’s general topology generation approach, graphs created with its Internet topology module are evaluated and found to be encouragingly similar to real-world datasets in various respects. |
BibTeX:
@inproceedings{DBLP:conf/simutools/ScholtesBEHSZ08,
author = {Ingo Scholtes and Jean Botev and Markus Esch and Alexander Höhfeld and Hermann Schloss and Benjamin Zech},
editor = {Sándor Molnár and John R. Heath and Olivier Dalle and Gabriel A. Wainer},
title = {TopGen - internet router-level topology generation based on technology constraints},
booktitle = {Proceedings of the 1st International Conference on Simulation Tools and Techniques for Communications, Networks and Systems & Workshops, SimuTools 2008, Marseille, France, March 3-7, 2008},
publisher = {ICST/ACM},
year = {2008},
pages = {30},
doi = {10.4108/ICST.SIMUTOOLS2008.3008}
}
|
| Esch M, Schloss H and Scholtes I (2007), “The SEMPA prototype – using XAML and web services for rich interactive Peer-to-Peer applications”, In Proceedings of the 3rd International Conference on Collaborative Computing: Networking, Applications and Worksharing, White Plains, New York, USA, November 12-15, 2007., 10, 2007. , pp. 271-277. IEEE Computer Society / ICST. |
| Abstract: Currently one can see a surge of evolving technologies supporting the creation of Rich Internet Applications. All of these approaches however traditionally address the classic Client/Server scenario in which a dedicated Web Server acts as application provider for thin clients. This paper argues, that there are many scenarios in which a Peer-to-Peer approach enabling every application/process to export parts of its graphical user interface in a lightweight and interoperable way would be more desirable. This work-in-progress paper presents the lightweight middleware prototype SEMPA, proving that these scenarios can be supported by combining the readily available technologies eXtensible Application Markup Language (XAML) and Web Services. |
BibTeX:
@inproceedings{DBLP:conf/colcom/EschSS07,
author = {Markus Esch and Hermann Schloss and Ingo Scholtes},
editor = {Juan Quemada and Tao Zhang},
title = {The SEMPA prototype - using XAML and web services for rich interactive Peer-to-Peer applications},
booktitle = {Proceedings of the 3rd International Conference on Collaborative Computing: Networking, Applications and Worksharing, White Plains, New York, USA, November 12-15, 2007},
publisher = {IEEE Computer Society / ICST},
year = {2007},
pages = {271--277},
doi = {10.1109/COLCOM.2007.4553841}
}
|