Benjamin Voelker, M.Sc.
Technische Fakultät
Albert-Ludwigs-Universität
Georges Köhler Allee, Gebäude 51
79110 Freiburg im Breisgau
Deutschland
Gebäude 051, Raum 01..035
+49 761 203-67671
+49 761 203-8142
voelkerb@informatik.uni-freiburg.de
Benjamin Voelker
Liste filtern : Jahre: 2019 |
2018 |
2017 |
2016 | alle anzeigen nach oben zur Jahresübersicht Benjamin Völker, Marc Pfeifer, Philipp M Scholl, Bernd BeckerA Versatile High Frequency Electricity Monitoring Framework for Our Future Connected Home 2019 EAI International Conference on Sustainable Energy for Smart Cities, Braga Portugal Springer» Kurzfassung anzeigen « Kurzfassung verbergen Kurzfassung In our homes a lot of devices are powered by electricity with- out us knowing the specific amount. As electricity production has a large, negative environmental impact, we should be more aware about how de- vices consume power and how we can adapt our daily routine to decrease our electricity requirements. Methods such as Non-Intrusive Load Mon- itoring (NILM) can provide the user with precise device level electricity data by measuring at a single point in a houses’ electricity network. However, the time resolution of most off-the-shelf power meters is not sufficient for NILM or the meters are locked down for security reasons. Therefore, we have developed our own versatile energy metering frame- work which consists of a high frequency electricity metering device, a versatile backend for data processing and a webapp for data visualiza- tion. The developed hardware is capable of sampling up to 32 kHz, while the software framework allows to extract other power related metrics such as harmonic content. The system’s application ranges from pro- viding transparent electricity usage to the user up to generating load forecasts with fine granularity. Benjamin Völker, Philipp M Scholl, Bernd BeckerSemi-Automatic Generation and Labeling of Training Data for Non-intrusive Load Monitoring 2019 e-Energy '19 Proceedings of the Tenth ACM International Conference on Future Energy Systems ACM New York, NY, USA ©2019, Band : 10, Seiten : 17 - 23» Kurzfassung anzeigen « Kurzfassung verbergen Kurzfassung User awareness is one of the main drivers to reduce unnecessary energy consumption in our homes. This awareness, however, requires individual energy data of the devices we own. A retrofittable way to get this data is to use Non-Intrusive Load Monitoring methods. Most of these methods are supervised and require to collect labeled ground truth data in advance. Labeling on-phases of devices is already a tedious process, but if further information about internal device states are required (e.g. intensity of an HVAC), manual labeling methods are infeasible. We propose a novel data collection and labeling method for Non-Intrusive Load Monitoring. This method uses intrusive sensors directly connected to the monitored devices. A post-processing step classifies the connected devices into four categories and exposes internal state sequences in a semi-automatic way. We evaluated our labeling method with a sample dataset comparing the amount of recognized events, states and classified device category. The event detector achieved a total F1 score of 86.52 % for devices which show distinct states in its power signal. Using our framework, the overall labeling effort is cut by more than half (42%). Phillip M Scholl, Benjamin Völker, Bernd Becker, Kristof Van LaerhovenA multi-media exchange format for time-series dataset curation In : Human Activity Sensing: Corpus and Applications 2019, Springer International Publishing , Seiten : 111 - 119, ISBN : 9783030130015» Kurzfassung anzeigen « Kurzfassung verbergen Kurzfassung Exchanging data as character-separated values (CSV) is slow, cumbersome and error-prone. Especially for time-series data, which is common in Activity Recognition, synchronizing several independently recorded sensors is challenging. Adding second level evidence, like video recordings from multiple angles and time-coded annotations, further complicates the matter of curating such data. A possible alternative is to make use of standardized multi-media formats. Sensor data can be encoded in audio format, and time-coded information, like annotations, as subtitles. Video data can be added easily. All this media can be merged into a single container file, which makes the issue of synchronization explicit. The incurred performance overhead by this encoding is shown to be negligible and compression can be applied to optimize storage and transmission overhead. nach oben zur Jahresübersicht Benjamin Völker, Philipp M Scholl, Bernd BeckerTowards the Fusion of Intrusive and Non-intrusive Load
Monitoring - A Hybrid Approach 2018 e-Energy '18 Proceedings of the Ninth International Conference on Future Energy Systems/Karlsruhe, Germany , Seiten : 436 - 438 » Kurzfassung anzeigen « Kurzfassung verbergen Kurzfassung With Electricity as a fundamental part of our life, its production has
still large, negative environmental impact. Therefore, one strain of
research is to optimize electricity usage by avoiding its unnecessary
consumption or time its consumption when green energy is available. The shift towards an Advanced Metering Infrastructure (AMI)
allows to optimize energy distribution based on the current load
at residence level. However, applications such as Demand Management and Advanced Load Forecasting require information further
down at device level, which cannot be provided by standard electricity meters nor existing AMIs. Hence, different approaches for
appliance monitoring emerged over the past 30 years which are
categorized into Intrusive systems requiring multiple distributed
sensors and Non-Intrusive systems requiring a single unobtrusive
sensor. Although each category has been individually explored,
hybrid approaches have received little attention. Our experiments
highlight that variable consumer devices (e.g. PCs) are detrimental
to the detection performance of non-intrusive systems. We further
show that their influence can be inhibited by using sensor data from
additional intrusive sensors. Even fairly straightforward sensor fusion techniques lead to a classification performance (F1) gain from
84.88 % to 93.41 % in our test setup. As this highlights the potential
to contribute to the global goal of saving energy, we define further
research directions for hybrid load monitoring systems nach oben zur Jahresübersicht Tobias Schubert, Benjamin Völker, Marc Pfeifer, Bernd BeckerThe Smart MiniFab: An Industrial IoT Demonstrator Anywhere at Any Time 2017 Smart Education and e-Learning 2017, Vilamoura/Portugal, KES International Springer International Publishing, Seiten : 253 - 262 nach oben zur Jahresübersicht Benjamin Völker, Tobias Schubert, Bernd BeckeriHouse: A Voice-Controlled, Centralized, Retrospective Smart Home 2016 7th EAI International Conference on Sensor Systems and Software » Kurzfassung anzeigen « Kurzfassung verbergen Kurzfassung Speech recognition in smart home systems has become pop- ular in both, research and consumer areas. This paper introduces an in- novative concept for a modular, customizable, and voice-controlled smart home system. The system combines the advantages of distributed and centralized processing to enable a secure as well as highly modular plat- form and allows to add existing non-smart components retrospectively into the smart environment. To interact with the system in the most com- fortable way - and in particular without additional devices like smart- phones - voice-controlling was added as the means of choice. The task of speech recognition is partitioned into decentral Wake-Up-Word (WUW) recognition and central continuous speech recognition to enable flexibil- ity while maintaining security. This is achieved utilizing a novel WUW algorithm suitable to be executed on small microcontrollers which uses Mel Frequency Cepstral Coefficients as well as Dynamic Time Warping. A high rejection rate up to 99.93% was achieved, justifying the use of the algorithm as a voice trigger in the developed smart home system.