no code implementations • 28 Jan 2024 • Ming-Chang Lee, Jia-Chun Lin, Volker Stolz
By systematically investigating the performance of k-means time series clustering with these two normalization techniques, this paper addresses the current gap in k-means time series clustering evaluation and contributes valuable insights to the development of time series clustering.
no code implementations • 25 May 2023 • Ming-Chang Lee, Jia-Chun Lin
It is also highly desirable to have a lightweight anomaly detection system that considers correlations between different variables, adapts to changes in the pattern of the multivariate time series, offers immediate responses, and provides supportive information regarding detection results based on unsupervised learning and online model training.
no code implementations • 30 Apr 2023 • Ming-Chang Lee, Jia-Chun Lin
Randomly choosing a deep learning library to implement an anomaly detection approach might not be able to show the true performance of the approach.
no code implementations • 12 Apr 2023 • Ming-Chang Lee, Jia-Chun Lin, Volker Stolz
Without needing to use any normalization method or tune any parameter, NP-Free can generate a representation for a raw time series on the fly by converting each data point of the time series into a root-mean-square error (RMSE) value based on Long Short-Term Memory (LSTM) and a Look-Back and Predict-Forward strategy.
no code implementations • 1 Mar 2023 • Ming-Chang Lee, Jia-Chun Lin
To address this issue, in this paper we propose RePAD2, a lightweight real-time anomaly detection approach for open-ended time series by improving its predecessor RePAD, which is one of the state-of-the-art anomaly detection approaches.
no code implementations • 19 May 2021 • Ming-Chang Lee, Jia-Chun Lin, Ernst Gunnar Gran
Otherwise, DistTune customizes an LSTM model for the detector to achieve fine-grained prediction.
no code implementations • 19 Apr 2021 • Ming-Chang Lee, Jia-Chun Lin, Ernst Gunnar Gran
If the difference between a calculated AARE value and its corresponding forecast AARE value is higher than a self-adaptive detection threshold, the corresponding data point is considered anomalous.
no code implementations • 12 Feb 2021 • Ming-Chang Lee, Jia-Chun Lin, Ernst Gunnar Gran
Anomaly detection is the process of identifying unexpected events or ab-normalities in data, and it has been applied in many different areas such as system monitoring, fraud detection, healthcare, intrusion detection, etc.
no code implementations • 10 May 2020 • Ming-Chang Lee, Jia-Chun Lin, Ernst Gunnar Gran
To make such customization process efficient and applicable for large-scale transportation networks, DistPre conducts LSTM customization on a cluster of computation nodes and allows any trained LSTM model to be shared between different detectors.
no code implementations • 5 Apr 2020 • Ming-Chang Lee, Jia-Chun Lin, Ernst Gunnar Gran
Anomaly detection is an active research topic in many different fields such as intrusion detection, network monitoring, system health monitoring, IoT healthcare, etc.
no code implementations • 24 Jan 2020 • Ming-Chang Lee, Jia-Chun Lin, Ernst Gunnar Gran
Providing real-time and proactive anomaly detection for streaming time series without human intervention and domain knowledge is highly valuable since it greatly reduces human effort and enables appropriate countermeasures to be undertaken before a disastrous damage, failure, or other harmful event occurs.
no code implementations • 24 Jan 2020 • Ming-Chang Lee, Jia-Chun Lin
Over the past decade, several approaches have been introduced for short-term traffic prediction.
no code implementations • 21 Jan 2020 • Ming-Chang Lee, Jia-Chun Lin, Olaf Owe
To show that elders' privacy could be substantially exposed, in this paper we develop a Privacy Deduction Scheme (PDS for short) by eavesdropping sensor traffic from a smart home to identify elders' movement activities and speculating sensor locations in the smart home based on a series of deductions from the viewpoint of an attacker.
no code implementations • 18 Aug 2018 • Ming-Chang Lee, Jia-Chun Lin, Olaf Owe
The experimental results demonstrate that PMA is able to deduce a global sensor topology for a smart home and disclose elders' privacy in terms of their house layouts.