@inproceedings{RuehrupSchindelhauerVolbert, author = {R{\"u}hrup, Stefan and Schindelhauer, Christian and Volbert, Klaus}, title = {Performance analysis of the hierarchical layer graph for wireless networks}, series = {4th International Conference, ADHOC-NOW 2005, Cancun, Mexico, October 6-8, 2005}, booktitle = {4th International Conference, ADHOC-NOW 2005, Cancun, Mexico, October 6-8, 2005}, publisher = {Springer}, address = {Berlin ; Heidelberg}, isbn = {978-3-540-29132-9}, doi = {10.1007/11561354_21}, pages = {244 -- 257}, abstract = {The Hierarchical Layer Graph (HL graph) is a promising network topology for wireless networks with variable transmission ranges. It was introduced and analyzed by Meyer auf der Heide et al. 2004. In this paper we present a distributed, localized and resource-efficient algorithm for constructing this graph. The qualtiy of the HL graph depends on the domination radius and the publication radius, which affect the amount of interference in the network. These parameters also determine whether the HL graph is a c-spanner, which implies an energy-efficient topology. We investigate the performance on randomly distributed node sets and show that the restrictions on these parameters derived from a worst case analysis are not so tight using realistic settings. Here, we present the results of our extensive experimental evaluation, measuring congestion, dilation and energy. Congestion includes the load that is induced by interfering edges. We distinguish between congestion and realistic congestion where we also take the signal-to-interference ratio into account. Our experiments show that the HL graph contains energy-efficient paths as well as paths with a few number of hops while preserving a low congestion.}, language = {en} } @inproceedings{WeissVolbert, author = {Weiß, Martin Georg and Volbert, Klaus}, title = {Intelligente Steuerung von Industrierobotern}, series = {Zweite OTH-Clusterkonferenz 18. Januar 2017 Techbase, Regensburg}, booktitle = {Zweite OTH-Clusterkonferenz 18. Januar 2017 Techbase, Regensburg}, editor = {Falter, Thomas}, address = {Regensburg}, organization = {OTH Regensburg und OTH Amberg-Weiden}, language = {de} } @inproceedings{ThelenEderMelzeretal., author = {Thelen, Simon and Eder, Friedrich and Melzer, Matthias and Weber Nunes, Danilo and Stadler, Michael and Rechenauer, Christian and Obergrießer, Mathias and Jubeh, Ruben and Volbert, Klaus and D{\"u}nnweber, Jan}, title = {A Slim Digital Twin For A Smart City And Its Residents}, series = {SOICT '23: Proceedings of the 12th International Symposium on Information and Communication Technology, 2023, Hi Chi Minh, Vietnam}, booktitle = {SOICT '23: Proceedings of the 12th International Symposium on Information and Communication Technology, 2023, Hi Chi Minh, Vietnam}, publisher = {ACM}, isbn = {979-8-4007-0891-6}, doi = {10.1145/3628797.3628936}, pages = {8 -- 15}, abstract = {In the engineering domain, representing real-world objects using a body of data, called a digital twin, which is frequently updated by "live" measurements, has shown various advantages over tradi- tional modelling and simulation techniques. Consequently, urban planners have a strong interest in digital twin technology, since it provides them with a laboratory for experimenting with data before making far-reaching decisions. Realizing these decisions involves the work of professionals in the architecture, engineering and construction (AEC) domain who nowadays collaborate via the methodology of building information modeling (BIM). At the same time, the citizen plays an integral role both in the data acquisition phase, while also being a beneficiary of the improved resource management strategies. In this paper, we present a prototype for a "digital energy twin" platform we designed in cooperation with the city of Regensburg. We show how our extensible platform de- sign can satisfy the various requirements of multiple user groups through a series of data processing solutions and visualizations, in- dicating valuable design and implementation guidelines for future projects. In particular, we focus on two example use cases concern- ing building electricity monitoring and BIM. By implementing a flexible data processing architecture we can involve citizens in the data acquisition process, meeting the demands of modern users regarding maximum transparency in the handling of their data.}, language = {en} } @inproceedings{ZengerKennerVolbertetal., author = {Zenger, Gerhard and Kenner, Susanne and Volbert, Klaus and Waas, Thomas and Kucera, Markus}, title = {Acquiring energy data from a medium-voltage grid for future smart grid solutions: A practical smart grid application example realized by use of cellular communication networks of the 2nd and 3rd generation}, series = {Proceedings of the 11th Workshop on Intelligent Solutions in Embedded Systems (WISES), 10-11 Sept. 2013, Pilsen, Czech Republic}, booktitle = {Proceedings of the 11th Workshop on Intelligent Solutions in Embedded Systems (WISES), 10-11 Sept. 2013, Pilsen, Czech Republic}, publisher = {IEEE}, isbn = {978-3-00-042899-9}, pages = {1 -- 8}, abstract = {In this paper we present a practical example of the use of Cellular Communication standards like GPRS and UMTS in a Smart Grid Application. For a more detailed view we demonstrate a possible implementation of Cellular Communication Technologies in a data acquisition application for the collection of energy indicators in a medium-voltage grid. Furthermore, we show a technical overview of relevant and common mobile communication standards available in Germany. The included theoretical examples, Smart Grid scenarios, presented data and results are based on a research project for intelligent power regulation in medium-voltage grids performed in Regensburg (Germany). It is a joint project' of the University of Applied Sciences Regensburg together with a local energy provider and a manufacturer for distribution network systems.}, language = {en} } @inproceedings{KennerThalerKuceraetal., author = {Kenner, Susanne and Thaler, Raphael and Kucera, Markus and Volbert, Klaus and Waas, Thomas}, title = {Smart Grid architecture for monitoring and analyzing, including modbus and REST performance comparison}, series = {International Workshop on Intelligent Solutions in Embedded Systems (WISES), 12th, 29.-30. Oct. 2015, Ancona, Italy}, booktitle = {International Workshop on Intelligent Solutions in Embedded Systems (WISES), 12th, 29.-30. Oct. 2015, Ancona, Italy}, isbn = {978-8-8875-4808-2}, pages = {96}, abstract = {Smart Grid, Smart Metering, Electromobility and the regulation of the power network are keywords of the transition in energy policies. In the future, the power grid will be smart. Due to this the OTH Regensburg does research in this area based on different projects. This paper presents a data collection, analyzing and monitoring software for a reference Smart Grid. We discuss two possible architectures for collecting data from energy analyzers. The performance is analyzed with respect to real-time monitoring, analyzing load peaks and automated regulation of the power grid.}, language = {en} } @inproceedings{SchwindlVolbertBock, author = {Schwindl, Tobias and Volbert, Klaus and Bock, Sebastian}, title = {Fast and Reliable Update Protocols in WSNs During Software Development, Testing and Deployment}, series = {Proceedings of the 7th International Conference on Sensor Networks - SENSORNETS, Funchal, January 22-24, 2018, Madeira, Portugal}, booktitle = {Proceedings of the 7th International Conference on Sensor Networks - SENSORNETS, Funchal, January 22-24, 2018, Madeira, Portugal}, editor = {Fleury, Eric and Ahrens, Andreas and Benavente-Peces, C{\´e}sar and Cam-Winget, Nancy}, publisher = {SCITEPRESS - Science and Technology Publications Lda}, address = {Set{\´u}bal, Portugal}, organization = {Institute for Systems and Technologies of Information, Control and Communication}, isbn = {978-989-758-284-4}, doi = {10.5220/0006534400190030}, pages = {19 -- 30}, abstract = {A lot of research has been done in the area of Wireless Sensor Networks during the past years. Today, Wireless Sensor Networks are in field in many different ways and applications (e.g. energy management services, heat and water billing, smoke detectors). Nevertheless, research and development is continued in this area. After the network is deployed, software updates are performed very rarely, but during development and testing one typical, high frequented task is to deploy a new firmware to thousands of nodes. In this paper, we consider such a software update for a special, but well-known and frequently used sensor network platform. There exist some interesting research papers about updating sensor nodes, but we have a special focus on the technical update process. In this context, we show the reasons why these existing update processes do not cover our challenges. Our goal is to allow a developer to update thousands of nodes reliably and very fast during development and testing. Fo r this purpose, it is not so important to perform the best update with regard to energy consumption. We do not need a multi hop protocol, because all devices are in range, e.g., in a laboratory. In our work, we present a model of the update process and give very fast protocols to solve it. The results of our extensive simulations show that the developed protocols do a fast, scalable and reliable update.}, language = {en} } @inproceedings{ThelenVolbertWeberNunes, author = {Thelen, Simon and Volbert, Klaus and Weber Nunes, Danilo}, title = {A Survey on Algorithmic Problems in Wireless Systems}, series = {Proceedings of the 12th International Conference on Sensor Networks (SENSORNETS), Vol 1, Feb 23, 2023 - Feb 24, 2023, Lisbon, Portugal}, booktitle = {Proceedings of the 12th International Conference on Sensor Networks (SENSORNETS), Vol 1, Feb 23, 2023 - Feb 24, 2023, Lisbon, Portugal}, publisher = {SCITEPRESS - Science and Technology Publications}, isbn = {978-989-758-635-4}, doi = {10.5220/0011791200003399}, pages = {101 -- 111}, abstract = {Considering the ongoing growth of Wireless Sensor Networks (WSNs) and the challenges they pose due to their hardware limitations as well as the intrinsic complexity of their interactions, specialized algorithms have the potential to help solving these challenges. We present a survey on recent developments regarding algorithmic problems which have applications in wireless systems and WSNs in particular. Focusing on the intersection between WSNs and algorithms, we give an overview of recent results inside this intersection, concerning topics such as routing, interference minimization, latency reduction, localization among others. Progress on solving these problems could be potentially beneficial for the industry as a whole by increasing network throughput, reducing latency or making systems more energy-efficient. We summarize and structure these recent developments and list interesting open problems to be investigated in future works.}, language = {en} }