3 research outputs found
TraVaS: Differentially Private Trace Variant Selection for Process Mining
In the area of industrial process mining, privacy-preserving event data
publication is becoming increasingly relevant. Consequently, the trade-off
between high data utility and quantifiable privacy poses new challenges.
State-of-the-art research mainly focuses on differentially private trace
variant construction based on prefix expansion methods. However, these
algorithms face several practical limitations such as high computational
complexity, introducing fake variants, removing frequent variants, and a
bounded variant length. In this paper, we introduce a new approach for direct
differentially private trace variant release which uses anonymized
\textit{partition selection} strategies to overcome the aforementioned
restraints. Experimental results on real-life event data show that our
algorithm outperforms state-of-the-art methods in terms of both plain data
utility and result utility preservation
TraVaG: Differentially Private Trace Variant Generation Using GANs
Process mining is rapidly growing in the industry. Consequently, privacy
concerns regarding sensitive and private information included in event data,
used by process mining algorithms, are becoming increasingly relevant.
State-of-the-art research mainly focuses on providing privacy guarantees, e.g.,
differential privacy, for trace variants that are used by the main process
mining techniques, e.g., process discovery. However, privacy preservation
techniques for releasing trace variants still do not fulfill all the
requirements of industry-scale usage. Moreover, providing privacy guarantees
when there exists a high rate of infrequent trace variants is still a
challenge. In this paper, we introduce TraVaG as a new approach for releasing
differentially private trace variants based on \text{Generative Adversarial
Networks} (GANs) that provides industry-scale benefits and enhances the level
of privacy guarantees when there exists a high ratio of infrequent variants.
Moreover, TraVaG overcomes shortcomings of conventional privacy preservation
techniques such as bounding the length of variants and introducing fake
variants. Experimental results on real-life event data show that our approach
outperforms state-of-the-art techniques in terms of privacy guarantees, plain
data utility preservation, and result utility preservation
First Implementation of a Two-Stage DC-DC Conversion Powering Scheme for the CMS Phase-2 Outer Tracker
The 2S silicon strip modules for the CMS Phase-2 tracker upgrade will require two operating voltages. These will be provided via a two-step DC-DC conversion powering scheme, in which one DC-DC converter delivers 2.5\,V while the second DC-DC converter receives 2.5\,V at its input and converts it to 1.2\,V. The DC-DC converters will be mounted on a flex PCB, the service hybrid, together with an opto-electrical converter module (VTRx+) and a serializer (LP-GBT). The service hybrid will be mounted directly on the 2S module. A prototype service hybrid has been developed and its performance has been evaluated, including radiative and conductive noise emissions, and efficiency. In addition system tests with a prototype module have been performed. In this report the service hybrid will be described and the test results will be summarized