Search Results for author: Chunkai Zhang

Found 8 papers, 4 papers with code

Discovering Utility-driven Interval Rules

1 code implementation28 Sep 2023 Chunkai Zhang, Maohua Lyu, Huaijin Hao, Wensheng Gan, Philip S. Yu

For artificial intelligence, high-utility sequential rule mining (HUSRM) is a knowledge discovery method that can reveal the associations between events in the sequences.

Relation

HUSP-SP: Faster Utility Mining on Sequence Data

1 code implementation29 Dec 2022 Chunkai Zhang, Yuting Yang, Zilin Du, Wensheng Gan, Philip S. Yu

High-utility sequential pattern mining (HUSPM) has emerged as an important topic due to its wide application and considerable popularity.

Sequential Pattern Mining

Totally-ordered Sequential Rules for Utility Maximization

no code implementations27 Sep 2022 Chunkai Zhang, Maohua Lyu, Wensheng Gan, Philip S. Yu

TotalSR creates a utility table that can efficiently calculate antecedent support and a utility prefix sum list that can compute the remaining utility in O(1) time for a sequence.

Sequential Pattern Mining

Reconstruct Anomaly to Normal: Adversarial Learned and Latent Vector-constrained Autoencoder for Time-series Anomaly Detection

no code implementations14 Oct 2020 Chunkai Zhang, Wei Zuo, Xuan Wang

To minimize the reconstruction error of normal data and maximize this of anomaly data, we do not just ensure normal data to reconstruct well, but also try to make the reconstruction of anomaly data consistent with the distribution of normal data, then anomalies will get higher reconstruction errors.

Anomaly Detection Time Series +1

VELC: A New Variational AutoEncoder Based Model for Time Series Anomaly Detection

1 code implementation3 Jul 2019 Chunkai Zhang, Shaocong Li, Hongye Zhang, Yingyang Chen

In view of reconstruct ability of the model and the calculation of anomaly score, this paper proposes a time series anomaly detection method based on Variational AutoEncoder model(VAE) with re-Encoder and Latent Constraint network(VELC).

Anomaly Detection Time Series +1

Anomaly Subsequence Detection with Dynamic Local Density for Time Series

no code implementations28 Jun 2019 Chunkai Zhang, Yingyang Chen, Ao Yin

Anomaly subsequence detection is to detect inconsistent data, which always contains important information, among time series.

Anomaly Detection Density Estimation +4

Deep Convolutional Neural Networks for Thermal Infrared Object Tracking

1 code implementation Knowledge-Based Systems 2017 QiaoLiu, Xiaohuan Lu, Zhenyu He, Chunkai Zhang, WenSheng Chen

We observe that the features from the fully-connected layer are not suitable for thermal infrared tracking due to the lack of spatial information of the target, while the features from the convolution layers are.

Object Thermal Infrared Object Tracking +2

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