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- Lundström, Adam, et al.
(författare)
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Improving deep learning based anomaly detection on multivariate time series through separated anomaly scoring
- 2022
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Ingår i: IEEE Access. - 2169-3536. ; 10, s. 108194-108204
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Tidskriftsartikel (refereegranskat)abstract
- The importance of anomaly detection in multivariate time series has led to the development of several prominent deep learning solutions. As a part of the anomaly detection method, the scoring method has shown to be of significant importance when separating non-anomalous points from anomalous ones. At this time, most of the solutions utilize an aggregated score which means that relevant information created by the anomaly detection model might be lost. Therefore, this study has set out to examine to what extent anomaly detection in multivariate time series based on deep learning can be improved if all the residuals from each individual channel is considered in the anomaly score. To achieve this, an aggregated and separated scoring method has been applied with a simple denoising convulutional autoencoder (DCAE). In addition, the performance has been compared with other state-of-the-art methods. The result showed that the separated approach has the potential to generate a significantly higher performance than the aggregated one. At the same time, there were some indications suggesting that an aggregated scoring is better at generalizing when no labels to base the anomaly thresholds on, are available. Therefore, the result should serve as an encouragement to use a separated scoring approach together with a small sample of labeled anomalies to optimise the thresholds. Lastly, due to the impact of the anomaly score, the result suggests that future research within this field should consider applying the same anomaly scoring method when comparing the performance of deep learning algorithms.
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| 5. |
- O'Nils, Mattias, et al.
(författare)
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Design of D-AMPS Channel Decoder with Codesign Methodologies
- 1996
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Ingår i: BEC '96, the 5th Biennial Baltic Electronics Conference, October 7-11, 1996, Tallinn, Estonia : proceedings. - Tallinn, Estonia : Tallinn Technical University. - 9789985590263 ; , s. 491-
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Konferensbidrag (refereegranskat)abstract
- This paper is a case study on tool based codesign methodology. The presented methods are observed by applying a D-AMPS channel decoder design to a codesign research tool-kit. The channel decoder functionality is described with five thousand lines of C code. The analysis (profiling, estimation, hardware-software partitioning and verification) of the C description are presented in the paper.
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- O’Nils, Mattias, et al.
(författare)
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Device driver and DMA controller synthesis from HW /SW communication protocol specifications
- 2001
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Ingår i: Design automation for embedded systems. - : Kluwer Academic Publishers. - 0929-5585 .- 1572-8080. ; 6:2, s. 177-205
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Tidskriftsartikel (refereegranskat)abstract
- We have separated the information required for HW /SW interface synthesis into three parts, the protocol specification, the operating system related information, and the processor related information. From these inputs a synthesis tool generates (a) device driver functions or (b) a combination of device driver functions and a DMA controller, depending on a designer’s decision. The clean separation of information facilitates (1) efficient design space exploration with combinations of different processors, operating systems and protocols, and (2) maintaining a large number of different versions and variants of HW /SW interfaces by synthesising them on demand. Protocols are specified as a grammar, which is fully independent of architecture and implementation. From this the synthesis tool generates device driver code in C and /or synthesizable RTL code in VHDL for DMA controllers. After the initial selection of implementation alternatives the presented methods are fully automated. Its computational complexity is quadratic in terms of the number of states. With real-life examples we show that the quality of the generated code is close to hand written quality in terms of performance, area and code size.
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| 9. |
- O'Nils, Mattias, et al.
(författare)
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Grammar Based Modelling and Synthesis of Device Drivers and Bus Interfaces
- 1998
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Ingår i: Proceedings. 24th EUROMICRO Conference, 25-27 Aug. 1998, Västerås. - 0818686464 ; , s. 55-58
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Konferensbidrag (refereegranskat)abstract
- ProGram, a grammar based communication protocol description language, is used for architectural independent modelling of device drivers and bus interfaces for mixed hardware/software systems. The specification of the protocol is separated from the description of processor bus interfaces and operating system device driver interfaces, which ensures a high efficiency in device driver development and maintenance. A synthesis method for device drivers is presented together with results on modelling and implementation efficiency for both device drivers and bus interfaces.
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