Article
Instruments & Instrumentation
D. J. Stieglitz, J. Santos, R. Fischer
Summary: In the tokamak ASDEX Upgrade, Integrated Data Analysis (IDA) is used to infer plasma quantities, such as electron density, using heterogeneous data sources. This paper presents a new forward model for O-mode profile reflectometry, which allows IDA to overcome problems associated with the established determination of cut-off locations. The method combines complementary diagnostics to determine density profiles and their uncertainties, with the newly added reflectometry closing a gap in the outer core region.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Review
Acoustics
Janek Groehl, Melanie Schellenberg, Kris Dreher, Lena Maier-Hein
Summary: Photoacoustic imaging (PAI) is a promising emerging imaging modality that enables spatially resolved imaging of optical tissue properties. However, extracting relevant tissue parameters from raw data is difficult, leading to the application of deep learning methods in PAI. These methods have advantages like fast computation times and adaptability to various problems, facilitating clinical translation.
Article
Engineering, Multidisciplinary
N. Subramaniyan, J. J. U. Buch, A. Amalin Prince, Surya Pathak
Summary: This paper presents a correlation-based Maximal Overlap Discrete Wavelet Packet Transform (MODWPT) method for microwave reflectometry-based fusion plasma diagnostics. It accurately measures beat frequency by removing interference through the use of suitable mother wavelet families based on various evaluation metrics.
Article
Biotechnology & Applied Microbiology
Salil Apte, Mathieu Falbriard, Frederic Meyer, Gregoire P. Millet, Vincent Gremeaux, Kamiar Aminian
Summary: Feedback of power during running is a promising tool for training and determining pacing strategies. However, current power estimation methods show low validity and are not customized for running on different slopes. To address this issue, we developed three machine-learning models to estimate peak horizontal power for level, uphill, and downhill running using gait spatiotemporal parameters, accelerometer, and gyroscope signals extracted from foot-worn IMUs. The prediction was compared to reference horizontal power obtained during running on a treadmill with an embedded force plate.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Shuai Li, Yanping Xu, Yuru Feng, Shuai Qu, Wenchen Yang, Zequn Wang, Zengguang Qin, Zhaojun Liu
Summary: The traditional phase-sensitive optical time-domain reflectometry (Phi-OTDR) has limitations in high-frequency vibration sensing and long-distance sensing. In this work, a novel method based on serial multi-coset sampling (MCS) strategy is proposed, which can recover sparse broadband vibration signals with sub-Nyquist sampling rates, breaking through the tradeoff between sensing range and measurable frequency bandwidth.
IEEE SENSORS JOURNAL
(2022)
Article
Environmental Sciences
Jitendra Kr Vyas, Muthiah Perumal, Tommaso Moramarco
Summary: The application of entropy theory in hydrometric measurements establishes a relationship between maximum and mean flow velocities, and a proposed two-steps approach for discharge estimation based on this relationship shows promising results in both Italy and India. The proposed method proves to be a viable alternative to the traditional velocity-area method, providing accurate discharge estimations with high efficiency values.
WATER RESOURCES RESEARCH
(2021)
Article
Optics
Hao Han, Yawei Wang, Yang Zou, Jingrong Liao, Yuanyuan Xu
Summary: This paper proposes a method for achieving 3D imaging of blood cell substructure with only two non-orthogonal phase images, breaking the limitations of traditional tomography and OPI. The method has high reconstruction efficiency and accuracy, as demonstrated through simulations and experiments on different types of blood cells.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Hao-Wei Lin, Chia-Ning Su, Tse-An Chen, Yi-Chen Chen, Mei-Jywan Syu, Chia-Ling Wei
Summary: A novel admittance-to-digital-impedance converter (ADIC) for impedance measurement is proposed, which features an operating range from 0.1 Hz to 10 kHz and has two main functions. With the use of two novel circuits, measurements can be performed at frequencies below 1 Hz and an accurate dividing function can be achieved.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Biomedical
Rahmat Ullah, Imran Saied, Tughrul Arslan
Summary: This paper presents a novel algorithm for near-field radar imaging in layered and dispersive media with application to biomedical imaging. The proposed algorithm compensates for variations in dielectric properties and integrates each component's frequency response to form an image. It resolves dispersion issues using frequency-dependent velocity and uses phase shift instead of time delay to overcome the disadvantage of time-shift radar-based methods. The algorithm allows detecting small changes in dispersive media such as the human brain.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2023)
Article
Automation & Control Systems
Gregory Johnson, Paolo Pianosi, Rajesh Rajamani
Summary: This article presents a system based on wearable inertial measurement unit that estimates three-dimensional respiratory displacements on the thoracoabdominal surface. It combines various algorithms and techniques to achieve real-time estimation of gravity components and accurate estimation of breathing frequency.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Engineering, Biomedical
Rahmat Ullah, Imran Saied, Tughrul Arslan
Summary: This paper presents a processing pipeline for a microwave head imaging system to monitor whole-brain atrophy as a way of monitoring neurodegenerative diseases. The integrated imaging algorithm and novel pre-processing techniques successfully remove clutter effects and accurately detect and locate whole-brain atrophy. The proposed method shows potential for real-time monitoring of neurodegenerative diseases.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2022)
Article
Engineering, Mechanical
Alireza Keramat, Huan-Feng Duan
Summary: This study focuses on using transient waves and system responses to identify leaks in water supply pipelines, proposing a new method that can accurately locate leaks with a single spatial measurement, and comparing and improving upon traditional methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Optics
Jianing Zhao, Zhenzhou Tang, Shilong Pan
Summary: The study demonstrates a photonic scheme that can simultaneously estimate the microwave Doppler-frequency shift and angle-of-arrive. The errors in the proof-of-concept experiment are small, showing promising results for accurate measurement.
Article
Engineering, Mechanical
Pan Dou, Yaping Jia, Tonghai Wu, Zhongxiao Peng, Min Yu, Tom Reddyhoff
Summary: This study proposes a method of reconstructing the incident signal by analyzing the amplitude and phase spectrum of the reflection coefficient from the reflected signal, enabling online measurement and calibration of oil film thickness. By utilizing certain relationships identified at the resonance frequency, the phase and amplitude of the incident signal can be accurately reconstructed. This method is validated on a test rig by comparing it with traditional off-line methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Chemistry, Analytical
Wenqiang Gong, Xuanze Wang, Zhenyu Yang, Zhongsheng Zhai, Wei Feng, Da Liu
Summary: This paper proposes a method that utilizes conventional sampling frequencies to acquire high-frequency ultrasonic echo signals, and achieves accurate thickness measurement through improved sampling reconstruction techniques and a combination of methods.