## 4 Dyversify Architecture
### Event/Anomaly Detection
#### 4.6.4 Event Detection: Expert-Rules
To show general applicability of the presented stack for real-life monitoring beyond the presented use case, and given the current pandemic of COVID-19, we are currently researching the potential of the Diversify stack for COVID-19 airborne transmission monitoring in buildings. Research continues on all techniques mentioned in this work, as well as their integration. Anomaly detection methods for IoT still suffer from the varying deployment situations and uncertainty on what should be considered anomalous. Incorporating the context of sensors into anomaly detection might prove useful. Monitoring of distributed systems faces similar challenges, since the normal system behavior changes as services are added or replaced on the network. Finally, more fine grained models might also be useful for recommending anomaly visualizations, since users will have different focuses based on their company role or expertise. Conceptualization, D.D.P. ; software, D.D.P., S.V.H. ([PERSON]), B.S., P.M., J.V. and S.V. ; validation, D.D.P., S.V.H. ([PERSON]), B.S., P.M. and J.V. ; resources, S.V. ; writing--original draft preparation, D.D.P. ; writing--review and editing, D.D.P., S.V.H. ([PERSON]), P.M. and S.V.H. ([PERSON]); supervision, B.V., F.O. and S.V.H. ([PERSON]); project administration, D.D.P., F.O. and S.V.H. ([PERSON]); funding acquisition, S.V.H. ([PERSON]). All authors have read and agreed to the published version of the manuscript. This research was partly funded by DyVerSIFy. The imec.icon project DyVerSIFy is co-financed by imec and VLAIO (project HBC.2017.0147) and brings together the following partners: Renson Ventilation, Televic Rail, cumul.io, and imec, IDLab, Ghent Unviversity. Validation of part of the Dyversify-stack was done via the VLAIO proof of concept Smart Maintenance of IDLab, Ghent University--imec and Flanders Make. Not applicable. Informed Consent Statement: Informed consent was obtained from all subjects involved in the study. Data Availability Statement: Not applicable. Conflicts of Interest: The authors declare no conflict of interest. ## References

* (1) eSIM Technology to Spur IoT Connections in APAC by 2025. Available online: [[https://www.forest-interactive.com/newsroom/esim-technology-to-spur-iot-connections-in-apac-by-2025/](https://www.forest-interactive.com/newsroom/esim-technology-to-spur-iot-connections-in-apac-by-2025/)]([https://www.forest-interactive.com/newsroom/esim-technology-to-spur-iot-connections-in-apac-by-2025/](https://www.forest-interactive.com/newsroom/esim-technology-to-spur-iot-connections-in-apac-by-2025/)) (accessed on 12 January 2021). * (2) Grand View Research--Predictive Maintenance Market Size Worth $28.24 Billion By 2025. Available online: [[https://www.grandviewresearch.com/press-release/global-predictive-maintenance-market](https://www.grandviewresearch.com/press-release/global-predictive-maintenance-market)]([https://www.grandviewresearch.com/press-release/global-predictive-maintenance-market](https://www.grandviewresearch.com/press-release/global-predictive-maintenance-market)) (accessed on 12 January 2021). * (3) [PERSON]; [PERSON]; [PERSON] Linked data: The story so far. In _Semantic Services, Interoperability and Web Applications: Emerging Concepts_; IGI Global: Hershey, PA, USA, 2011; pp. 205-227. * (4) [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON] [PERSON]; et al. Raising interoperability among base registries: The evolution of the Linked Base Registry for addresses in Flanders. _J. Web Semant._**2019**, 55, 86-101. [CrossRef]
* (5) [PERSON] Publishing the British national bibliography as linked open data. _Cat. Index_**2014**, 174, 13-18. * (6) [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] Streaming MASSIF: Cascading reasoning for efficient processing of iot data streams. _Sensors_**2018**, 18, 383.