TY - CHAP U1 - Konferenzveröffentlichung A1 - Nugroho, Saptadi A1 - Weinmann, Alexander A1 - Schindelhauer, Christian A1 - Christ, Andreas ED - De La Prieta, Fernando T1 - Averaging Emulated Time-Series Data Using Approximate Histograms in Peer to Peer Networks T2 - Highlights in Practical Applications of Agents, Multi-Agent Systems, and Trust-worthiness N2 - The interaction between agents in multiagent-based control systems requires peer to peer communication between agents avoiding central control. The sensor nodes represent agents and produce measurement data every time step. The nodes exchange time series data by using the peer to peer network in order to calculate an aggregation function for solving a problem cooperatively. We investigate the aggregation process of averaging data for time series data of nodes in a peer to peer network by using the grouping algorithm of Cichon et al. 2018. Nodes communicate whether data is new and map data values according to their sizes into a histogram. This map message consists of the subintervals and vectors for estimating the node joining and leaving the subinterval. At each time step, the nodes communicate with each other in synchronous rounds to exchange map messages until the network converges to a common map message. The node calculates the average value of time series data produced by all nodes in the network by using the histogram algorithm. The relative error for comparing the output of averaging time series data, and the ground truth of the average value in the network will decrease as the size of the network increases. We perform simulations which show that the approximate histograms method provides a reasonable approximation of time series data. KW - agent KW - sensor node KW - time series data KW - approximate histograms KW - peer to peer network Y1 - 2020 SN - 1865-0929 (Print) SS - 1865-0929 (Print) SN - 1865-0937 (Online) SS - 1865-0937 (Online) SN - 978-3-030-51998-8 (Print) SB - 978-3-030-51998-8 (Print) SN - 978-3-030-51999-5 (Online) SB - 978-3-030-51999-5 (Online) U6 - https://dx.doi.org/10.1007/978-3-030-51999-5_28 DO - https://dx.doi.org/10.1007/978-3-030-51999-5_28 N1 - International Workshops of PAAMS 2020, L'Aquila, Italy, October 7–9, 2020, Proceedings SP - 339 EP - 346 S1 - 8 PB - Springer CY - Schweiz ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Rohbogner, Gregor A1 - Fey, Simon A1 - Benoit, Pascal A1 - Wittwer, Christof A1 - Christ, Andreas T1 - Design of a Multiagent-Based Voltage Control System in Peer-to-Peer Networks for Smart Grids JF - Energy Technology KW - Intelligentes Stromnetz KW - Netzwerk KW - Spannung Y1 - 2014 UR - http://onlinelibrary.wiley.com/doi/10.1002/ente.201300080/pdf SN - 2194-4296 SS - 2194-4296 U6 - https://dx.doi.org/10.1002/ente.201300080 DO - https://dx.doi.org/10.1002/ente.201300080 VL - 2 IS - 1 SP - 107 EP - 120 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed) A1 - Marepalli, Sai Manoj A1 - Sultana, Razia A1 - Christ, Andreas T1 - The Challenges of Collaborative Learning in Cloud and a Three Layered Architecture Towards the Solution JF - 3rd International Conference on Digital Information and Communication Technology and Its Applications (DICTAP 2013) : Ostrava, Czech Republic, 8 - 10 July 2013 KW - E-Learning Y1 - 2013 SN - 978-1-5108-0865-2 SB - 978-1-5108-0865-2 SP - 134 EP - 139 ER - TY - CHAP U1 - Konferenzveröffentlichung A1 - Sultana, Razia A1 - Christ, Andreas T1 - Smoothie: a solution for device and content independent applications including 3D imaging as content T2 - 1. Baden-Württemberg Center of Applied Research Symposium on Information and communication Systems - SInCom2014 N2 - Network landscape of recent time contains many different network technologies, a wide range of end-devices with a large scale of capabilities and power, and an immense quantity of information represented in different data formats. Research on 3D imaging, virtual reality and holographic techniques will result in new user interfaces (UI) for mobile devices and will increase their diversity and variety. A lot of effort is being made in order to establish open, scalable and seamless integration of various technologies and content presentation for different devices including those that are mobile, considering the individual situation of the end user. Till today the research is going on in different parts of the world but the task is not completed yet. The goal of this research work is to find a way to solve the above stated problems by investigating system architectures to provide unconstrained, continuous and personalized access to the content and interactive applications everywhere and at anytime with different devices. As a Solution of the problem considered, a new architecture named “Smoothie” is proposed. Y1 - 2014 UR - https://opus.hs-offenburg.de/frontdoor/index/index/docId/1782 SN - 978-3-00-048182-6 SB - 978-3-00-048182-6 SP - 13 EP - 18 S1 - 6 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - nicht begutachtet (unreviewed) A1 - Weber, Christian A1 - Minin, Peter A1 - Felhauer, Tobias A1 - Christ, Andreas A1 - Schüssele, Lothar T1 - Data clustering algorithm for channel segmentation in a radio monitoring system T2 - IET Communications KW - Funktechnik KW - Überwachung KW - Algorithmus Y1 - 2014 SN - 1751-8628 SS - 1751-8628 U6 - https://dx.doi.org/10.1049/iet-com.2013.1104 DO - https://dx.doi.org/10.1049/iet-com.2013.1104 VL - 8 IS - 18 SP - 3308 EP - 3317 ER - TY - CHAP U1 - Konferenzveröffentlichung A1 - Weber, Christian A1 - Christ, Andreas A1 - Felhauer, Tobias A1 - Schüssele, Lothar T1 - A novel algorithm for channel segmentation based on a Lloyd-Max quantization T2 - 20th International Conference on Microwaves, Radar, and Wireless Communications (MIKON) KW - kanal KW - Segmentierung KW - Algorithmus Y1 - 2014 U6 - https://dx.doi.org/10.1109/MIKON.2014.6900011 DO - https://dx.doi.org/10.1109/MIKON.2014.6900011 SP - 1 EP - 4 ER - TY - CHAP U1 - Konferenzveröffentlichung A1 - Marepalli, Sai Manoj A1 - Christ, Andreas ED - Bajo, Javier T1 - Computing Aggregates on Autonomous, Self-organizing Multi-Agent System: Application "Smart Grid" T2 - Highlights of Practical Applications of Cyber-Physical Multi-Agent Systems N2 - Decentralized data aggregation plays an important role in estimating the state of the smart grid, allowing the determination of meaningful system-wide measures (such as the current power generation, consumption, etc.) to balance the power in the grid environment. Data aggregation is often practicable if the aggregation is performed effectively. However, many existing approaches are lacking in terms of fault-tolerance. We present an approach to construct a robust self-organizing overlay by exploiting the heterogeneous characteristics of the nodes and interlinking the most reliable nodes to form an stable unstructured overlay. The network structure can recover from random state perturbations in finite time and tolerates substantial message loss. Our approach is inspired from biological and sociological self-organizing mechanisms. KW - distributed computing, self-organizing networks, agent based systems, reliability, bio-inspired models Y1 - 2017 SN - 1865-0929 SS - 1865-0929 U6 - https://dx.doi.org/10.1007/978-3-319-60285-1 DO - https://dx.doi.org/10.1007/978-3-319-60285-1 SP - 271 EP - 283 S1 - 13 PB - Springer International Publishing CY - Basel ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - nicht begutachtet (unreviewed) A1 - Sultana, Razia A1 - Christ, Andreas A1 - Feißt, Markus A1 - Curticapean, Dan ED - Pereira da Cunha Martins Costa, Manuel Filipe ED - Zghal, Mourad T1 - Learning in the cloud: a new challenge for a global teaching system in optics and photonics T2 - Proceedings of SPIE N2 - Nowadays, it is assumed of many applications, companies and parts of the society to be always available online. However, according to [Times, Oct, 31 2011], 73% of the world population do not use the internet and thus aren't “online” at all. The most common reasons for not being “online” are expensive personal computer equipment and high costs for data connections, especially in developing countries that comprise most of the world’s population (e.g. parts of Africa, Asia, Central and South America). However it seems that these countries are leap-frogging the “PC and landline” age and moving directly to the “mobile” age. Decreasing prices for smart phones with internet connectivity and PC-like operating systems make it more affordable for these parts of the world population to join the “always-online” community. Storing learning content in a way accessible to everyone, including mobile and smart phones, seems therefore to be beneficial. This way, learning content can be accessed by personal computers as well as by mobile and smart phones and thus be accessible for a big range of devices and users. A new trend in the Internet technologies is to go to “the cloud”. This paper discusses the changes, challenges and risks of storing learning content in the “cloud”. The experiences were gathered during the evaluation of the necessary changes in order to make our solutions and systems “cloud-ready”. KW - Optik KW - Photonik KW - e-learning Y1 - 2014 SN - 0277-786X SS - 0277-786X SN - 978-1-628-41364-9 SB - 978-1-628-41364-9 U6 - https://dx.doi.org/10.1117/12.2070558 DO - https://dx.doi.org/10.1117/12.2070558 N1 - Konferenz: 12th International Conference on Education and Training in Optics & Photonics, 2013, Porto, Portugal (ETOP 2013) VL - 9289 SP - 92891R-1 EP - 92891R-7 S1 - 7 CY - Bellingham, Washington ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - nicht begutachtet (unreviewed) A1 - Sultana, Razia A1 - Christ, Andreas A1 - Meyrueis, Patrick L. T1 - Diversity of devices along with diversity of data formats as a new challenge in global teaching and learning system T2 - 12th International Conference on Education and Training in Optics & Photonics Y1 - 2013 UR - https://www.osapublishing.org/abstract.cfm?uri=ETOP-2013-EThF5 VL - 2013 ER - TY - JOUR U1 - Zeitschriftenartikel, wissenschaftlich - nicht begutachtet (unreviewed) A1 - Sultana, Razia A1 - Christ, Andreas T1 - System Architecture for Device and Content Independent Communication Including 3D Imaging; 12th World Conference on Mobile and Contextual Learning KW - Kommunikation Y1 - 2013 U6 - https://dx.doi.org/10.5339/qproc.2013.mlearn.33 DO - https://dx.doi.org/10.5339/qproc.2013.mlearn.33 VL - 2013 ER -