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Although massive real-time data collected from users can provide benefits to improve the quality of human daily lives, it is possible to expose users' privacy. \begin{document}$\epsilon$\end{document} -differential privacy is a notable model to provide strong privacy preserving in statistics. The existing works highlight \begin{document}$ω$\end{document} -event differential privacy with a fixed window size, which may not be suitable for many practical scenarios. In view of this issue, we explore a real-time scheme with adaptive \begin{document}$ω$\end{document} -event for differentially private time-series publishing (ADP) in this paper. In specific, we define a novel notion, Quality of Privacy (QoP) to measure both the utility of the released statistics and the performance of privacy preserving. According to this, we present an adaptive \begin{document}$ω$\end{document} -event differential privacy model that can provide privacy protection with higher accuracy and better privacy protection effect. In addition, we also design a smart grouping mechanism to improve the grouping performance, and then improve the availability of publishing statistics. Finally, comparing with the existing schemes, we exploit real-world and synthetic datasets to conduct several experiments to demonstrate the superior performance of the ADP scheme.

A real-time aggregate data publishing scheme with adaptive <i>ω</i>-event differential privacy