Search Results for author: Oliver Y. Chén

Found 15 papers, 7 papers with code

L-SeqSleepNet: Whole-cycle Long Sequence Modelling for Automatic Sleep Staging

1 code implementation9 Jan 2023 Huy Phan, Kristian P. Lorenzen, Elisabeth Heremans, Oliver Y. Chén, Minh C. Tran, Philipp Koch, Alfred Mertins, Mathias Baumert, Kaare Mikkelsen, Maarten De Vos

In this work, we show that while encoding the logic of a whole sleep cycle is crucial to improve sleep staging performance, the sequential modelling approach in existing state-of-the-art deep learning models are inefficient for that purpose.

EEG Sleep Staging

Personalized Longitudinal Assessment of Multiple Sclerosis Using Smartphones

no code implementations20 Sep 2022 Oliver Y. Chén, Florian Lipsmeier, Huy Phan, Frank Dondelinger, Andrew Creagh, Christian Gossens, Michael Lindemann, Maarten De Vos

The results show that the proposed model is promising to achieve personalized longitudinal MS assessment; they also suggest that features related to gait and balance as well as upper extremity function, remotely collected from sensor-based assessments, may be useful digital markers for predicting MS over time.

Imputation

SleepTransformer: Automatic Sleep Staging with Interpretability and Uncertainty Quantification

no code implementations23 May 2021 Huy Phan, Kaare Mikkelsen, Oliver Y. Chén, Philipp Koch, Alfred Mertins, Maarten De Vos

It is based on the transformer backbone and offers interpretability of the model's decisions at both the epoch and sequence level.

EEG Sleep Staging +1

Multi-view Audio and Music Classification

no code implementations3 Mar 2021 Huy Phan, Huy Le Nguyen, Oliver Y. Chén, Lam Pham, Philipp Koch, Ian McLoughlin, Alfred Mertins

The learned embedding in the subnetworks are then concatenated to form the multi-view embedding for classification similar to a simple concatenation network.

Classification General Classification +2

Self-Attention Generative Adversarial Network for Speech Enhancement

1 code implementation18 Oct 2020 Huy Phan, Huy Le Nguyen, Oliver Y. Chén, Philipp Koch, Ngoc Q. K. Duong, Ian McLoughlin, Alfred Mertins

Existing generative adversarial networks (GANs) for speech enhancement solely rely on the convolution operation, which may obscure temporal dependencies across the sequence input.

Generative Adversarial Network Speech Enhancement

XSleepNet: Multi-View Sequential Model for Automatic Sleep Staging

1 code implementation8 Jul 2020 Huy Phan, Oliver Y. Chén, Minh C. Tran, Philipp Koch, Alfred Mertins, Maarten De Vos

This work proposes a sequence-to-sequence sleep staging model, XSleepNet, that is capable of learning a joint representation from both raw signals and time-frequency images.

Sleep Staging

Personalized Automatic Sleep Staging with Single-Night Data: a Pilot Study with KL-Divergence Regularization

no code implementations23 Apr 2020 Huy Phan, Kaare Mikkelsen, Oliver Y. Chén, Philipp Koch, Alfred Mertins, Preben Kidmose, Maarten De Vos

We employ the pretrained SeqSleepNet (i. e. the subject independent model) as a starting point and finetune it with the single-night personalization data to derive the personalized model.

Sleep Staging Specificity +1

Improving GANs for Speech Enhancement

2 code implementations15 Jan 2020 Huy Phan, Ian V. McLoughlin, Lam Pham, Oliver Y. Chén, Philipp Koch, Maarten De Vos, Alfred Mertins

The former constrains the generators to learn a common mapping that is iteratively applied at all enhancement stages and results in a small model footprint.

Speech Enhancement

Towards More Accurate Automatic Sleep Staging via Deep Transfer Learning

1 code implementation30 Jul 2019 Huy Phan, Oliver Y. Chén, Philipp Koch, Zongqing Lu, Ian McLoughlin, Alfred Mertins, Maarten De Vos

We employ the Montreal Archive of Sleep Studies (MASS) database consisting of 200 subjects as the source domain and study deep transfer learning on three different target domains: the Sleep Cassette subset and the Sleep Telemetry subset of the Sleep-EDF Expanded database, and the Surrey-cEEGrid database.

Automatic Sleep Stage Classification Multimodal Sleep Stage Detection +2

Deep Transfer Learning for Single-Channel Automatic Sleep Staging with Channel Mismatch

no code implementations11 Apr 2019 Huy Phan, Oliver Y. Chén, Philipp Koch, Alfred Mertins, Maarten De Vos

This work presents a deep transfer learning approach to overcome the channel mismatch problem and transfer knowledge from a large dataset to a small cohort to study automatic sleep staging with single-channel input.

Sleep Staging Transfer Learning

Beyond Equal-Length Snippets: How Long is Sufficient to Recognize an Audio Scene?

no code implementations2 Nov 2018 Huy Phan, Oliver Y. Chén, Philipp Koch, Lam Pham, Ian McLoughlin, Alfred Mertins, Maarten De Vos

Moreover, as model fusion with deep network ensemble is prevalent in audio scene classification, we further study whether, and if so, when model fusion is necessary for this task.

General Classification Scene Classification

SeqSleepNet: End-to-End Hierarchical Recurrent Neural Network for Sequence-to-Sequence Automatic Sleep Staging

2 code implementations28 Sep 2018 Huy Phan, Fernando Andreotti, Navin Cooray, Oliver Y. Chén, Maarten De Vos

At the sequence processing level, a recurrent layer placed on top of the learned epoch-wise features for long-term modelling of sequential epochs.

General Classification Sleep Staging

Joint Classification and Prediction CNN Framework for Automatic Sleep Stage Classification

1 code implementation16 May 2018 Huy Phan, Fernando Andreotti, Navin Cooray, Oliver Y. Chén, Maarten De Vos

While the proposed framework is orthogonal to the widely adopted classification schemes, which take one or multiple epochs as contextual inputs and produce a single classification decision on the target epoch, we demonstrate its advantages in several ways.

Automatic Sleep Stage Classification Classification +2

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