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Faculty 3 - Mathematics and Computer Science: Cognitive Systems Lab

Dr. Hui Liu

Hui Liu
© Hui Liu

Enrique-Schmidt-Str. 5
Cartesium, Room 2.14
28359 Bremen

+49(0)421-218-64278

hui.liuprotect me ?!uni-bremenprotect me ?!.de

0000-0002-6850-9570

Google Scholar

 

I studied electrical engineering at the Technical University of Berlin (Dipl.-Ing., 2009) and information and communication systems at Shanghai Jiao Tong University (M.Sc., 2011). Since 2016, I have been a researcher for biosignal processing, human activity recognition, virtual reality, and music information retrieval at the Cognitive Systems Lab of the University of Bremen, where I received my Ph.D. (2021). I am co-responsible for three multipartner projects: Arthrokinemat (intelligent knee bandage), IntEL4CoRo (interactive learning for cognitive robotics), and NF-BWB (young talent development). I developed the first smart knee bandage that recognizes users' activities in real-time  (Best Student Paper, BIODEVICES 2019) and proposed Motion Units, an activity modeling method with interpretability, generalizability, and expandability, rationalizing kinesiology and speech recognition knowledge into human activity research (2021). I collected and released the 19-channel, 22-activity, 20-subject human activity dataset CSL-SHARE (2021). My two papers on high-level feature design (co-author) and music signal processing (first author) were the Best Paper Finalists (BIOSIGNALS 2022 / SIGMAP 2022). I received the following third-party funding and awards: the Erasmus Teaching Mobility Award (2018), the CAMPUSiDEEN Public Choice Award for advanced sensing and recognition technology (2022), and the YERUN Research Mobility Award (2022/2023).

Recently, my international collaboration has expanded to include research in singing audio processing, orthotics, and exoskeletons, for which a considerable number of topics are carried out in parallel. I always eagerly await new interdisciplinary and cross-border cooperation in various fields!

 

© Hui Liu, Cognitive Systems Lab, Universität Bremen

Research Interests and Keywords

  • Wearables

      • (Wireless) Body Sensor Network (WBSN/BSN)
      • Body Area Network
      • Inertial sensors and Inertial Measurement Unit (IMU)
      • Electromyography (EMG), electrogoniometers, and other sensors
      • Ubiquitous/pervasive computing
      • Facial EMG (fEMG) and Action Unit Recognition (AUR)

    • Big Data

      • Multimodal data visualization
      • Statistical analysis
      • Organization, operation, and post-processing of big data acquisition
      • Automatic and semi-automatic segmentation and annotation
      • Subsequence search
      • Self-similarity matrix and novelty search
      • Open-source human activity dataset sharing CSL-SHARE

    • Digital Signal Processing (DSP)

      • Multisensorial and multichannel biosignal processing
      • Preprocessing and feature extraction
      • Time series processing
      • Biosignals and user interfaces

    • Machine Learning (ML) / Artificial Intelligence (AI)

      • Feature selection and feature space reduction
      • Early fusion and late fusion
      • Hidden Markov Model (HMM)
      • CNN, RNN, and ResNet
      • Model training, decoding, and evaluation

    • Human Activity Recognition (HAR)

      • Human Activity Recognition Research Pipeline: HAR-Pipeline
      • Advanced human activity modeling: Motion Units
      • HAR Software development: Activity Signal Kit (ASK)
      • Real-time end-to-end HAR system: Activity Signal Kit Echtzeit-Decoder (ASKED)
      • On-the-fly plug-and-play HAR functionality: Activity Signal Kit Plug-And-PlAy (ASKPAPA)
      • Internal sensing and wearable computing for HAR

    • Biomedical Engineering (BME)

      • Rehabilitation assistance
      • Arthritis and knee bandage
      • Mobile phone application for auxiliary medical care
      • Virtual Reality (VR) and Mixed Reality (MR) for BME

    • Music Information Retrieval (MIR)

      • Feature extraction of melody pitch statistics
      • MIR-based amateur singing assistance
      • Joint processing of pitch statistics and audio signals
    Hui's supervised students and research assistants (partially) 2023
    © Shiyao Zhang / Hui Liu
    Hui's supervised students and research assistants (partially) 2023

    Job Information

    My best research assistants and students (HiWi/thesis/guest)

    Yale Hartmann
    © Yale Hartmann
    Research assistant 2018 — 2020 (HAR); Bachelor thesis 2019 (full score); Master thesis 2020 (full score) → Ph.D candidate @ CSL
    Anindya Chowdhury
    © Anindya Chowdhury
    Research assistant 2019 (statistical models) → Data Analyst @ Fujifilm Europe, Ratingen
    Lennard Mai
    © Lennard Mai
    Bachelor thesis 2019 (automatic segmentation of motion data) → Junior Data Engineer @ hmmh, Bremen
    Timo Urban
    © Timo Urban
    Bachelor thesis 2019 (Android APP development for biosignal acquisition, full score) → Software engineer @ TK, Hamburg
    Kilian Luedemann
    © Kilian Luedemann
    Bachelor thesis 2021 (RNN-based fall detection using IF videos) → Software engineer @ RealCore Group, Essen
    Tobias Dellert
    © Tobias Dellert
    Bacheler thesis 2022 (HRV and inertial signals for real-time workload monitoring in AWS) @ Tbilisi, Georgia → Data Engineer @ WearHealth, Bremen
    Isabel de Almeida Curioso
    © Isabel de Almeida Curioso
    Master thesis 2022 (missing data on clinical contexts, 20/20, best of the year) @ Lisbon, Portugal (20/20, best of the year) → Researcher @ Portugal
    Shiyao Zhang
    © Shiyao Zhang
    Research assistant since 2022 (artifact recognition during biosignal acquisition; research group convenor)
    Steffen Lahrberg
    © Steffen Lahrberg
    Bachelor thesis 20121 (cross-channel features for direction distinguishment in HAR, full score)
    Wei Wang
    © Wei_Wang
    Master thesis 2022 (subsequence search for automatic heart sound segmentation) @ Hannover → IT application developer @ Bosch, Eisenach
    Daniel Faustino de Noronha Osório
    © Daniel Faustino de Noronha Osório
    Ph.D. thesis 2023 (pervasive and remote sensing in cardiovascular disease assessment) @ Lisbon, Portugal → Senior Engineer @ PLUX wireless biosignals SA
    Jonas Boule
    © Jonas Boule
    Research assistant since 2023 (EEG analysis; EEG and inertial data fusion for HAR)
    Romina Razeghi Oskouei
    © Romina Razeghi Oskouei
    Research assistant since 2023 (EMG signal acquisition and processing)
    Ferdinand Rohlfing
    © Ferdinand Rohlfing
    Research assistant since 2023 (ML for EMG-based action unit recognition)
    Anantha Sripada Abhinav Veldanda
    © Anantha Sripada Abhinav Veldanda
    Guest research scholar & Bachelor thesis 2023 (real-time action unit recognition) @ Goa/Bremen (Grade A) → Engineer @ India
    Ciwan Gülpinar
    © Ciwan Gülpinar
    Bachelor Thesis 2023 (Biosignals in VR) → Master student @ Uni Bremen
    Johann Joachim Keuneke
    © Johann Joachim Keuneke
    Graduation research in progress (multimodal sensors in mobile phone)
    Daniel Ott
    © Daniel Ott
    Graduation research in progress (GUI design and user experience analysis for singing assistance)
    Hasanur Jaman Seam
    © Hasanur Jaman Seam
    Graduation research in progress (mobile phone-based HAR)
    Hannes Wehrmann
    © Hannes Wehrmann
    Graduation research in progress (HAR-based real-time sonification during sports)
    Rakibul Islam
    © Rakibul Islam
    Graduation research in progress (GUI design and usability validation of self-similarity-based automatic time-series analysis)
    Thorben Lorenzen
    © Thorben Lorenzen
    Graduation research in progress (EMG-based piano playing finger recognition)
    Leon Flaack
    © Leon Flaack
    Graduation research in progress (LSTM-based main melody channel detection from MIDI)
    Jiumeng Chen
    © Jiumeng Chen
    Graduation research in progress (foot activity recognition)
    Joel Warnken
    © Joel Warnken
    Graduation research in progress (singing pitch detection and intonation training)
    Mohamad Asif Siddiqui
    © Mohamad Asif Siddiqui
    Graduation research in progress (outlier detection benchmark)
    Mohamad Tofayel Ahmed
    © Mohamad Tofayel Ahmed
    Graduation research in progress (regression benchmark and AI-based correction of fuel cell aging model)
    Arthur Belousov
    © Arthur Belousov
    Graduation research in progress (piano audio-based automatic score generation)
    Aklima Akter
    © Aklima Akter
    Graduation research in progress (advanced data processing for Wi-Fi-based HAR)
    Yvo Muslukus
    © Yvo Muslukus
    Research assistant since 2023 (ML for EMG-based action unit recognition)
    BBDCB23 Foto
    © BWB, Bremen
    NF-BWB (Bremen Big Data Challenge Basic)

    Research Projects

    BIODEVICES 2019 (Best Paper, Student Author) / CAMPUSiDEEN 2022 (Public Choice Award) / KIT Adaptive Systems Talks 2022 / MindDay 2021
    © Jens Lehmkühler, BRIDGE / Guanjie Wang / Frank Pusch
    BIODEVICES 2019 (Best Paper, Student Author) / CAMPUSiDEEN 2022 (Public Choice Award) / KIT Adaptive Systems Talks 2022 / MindDay 2021

    Academic Activities and Contributions

    • Editorial Board

      • Frontiers in Big Data

      • Frontiers in Artificial Intelligence

    • Editor

      • Frontiers in Behavioral Neuroscience

    • Program Chair

      • BIOSIGNALS 2024 (in BIOSTEC 2024) – 17th International Conference on Bio-Inspired Systems and Signal Processing​ (Rome, Italy)

    • Session Chair

      • HEALTHINF 2022 (in BIOSTEC 2022) – 15th International Conference on Health Informatics (Vienna, Austria)

      • SIGMAP 2022 – 19th International Conference on Signal Processing and Multimedia Applications (Lisbon, Portugal)

      • BIOSTEC 2023 – 16th International Joint Conference on Biomedical Engineering Systems and Technologies  (Lisbon, Portugal)

    • Peer Reviewer

      • For 33 international journals, including Nat. Commn., Biomed. Signal Process. Control, Remote Sens., Front. Physiol., Front. Med., Physiol. Meas., Phys. Scr., Biomimetics, and Biosensors

      • For various conferences, including IEEE BSN and BHI; ACM ICMI, ISWC, and AUTOMOTIVEUI; ITG

    • Universidade Nova de Lisboa (Lisbon, Portugal)

      • Erasmus Teaching Staff Mobility, 2018

    • Verein der CDHAW-Absolventen und Mitglieder der Tongji-Universität (Düsseldorf)

    • BIOSTEC 2019 - 12th International Joint Conference on Biomedical Engineering Systems and Technologies  (Prague, Czech)

    • BBDC 2019 - 4th Bremen Big Data Challenge

      • Big data acquisition, processing, and provision

    • Bremen.AI 2019

      • Demonstration of real-time human activity recognition
      • Demonstration of MR game platform for rehabilitation assistance

    • MindDay 2021

      • Demonstration of intelligent knee bandage

    • KIT Adaptive Systems Talks 2022

      • Invited workshop speaker

    • CAMPUSiDEEN 2022

      • Public Choice Award

    Courses

    • Hot Topics in Sensors and Human Activity Research

      • Thursday 14:00 – 16:00

    • Biosignals and User Interfaces

    Appointment

    • General: Tuesday 16:00 - 18:00

    • Or by prior appointment via Email

    Publications

    Updated by: Eric Schädler
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