A5057565984- Random lasers and scattering media
- Photoacoustic and Ultrasonic Imaging
- Spectroscopy Techniques in Biomedical and Chemical Research
- Orbital Angular Momentum in Optics
- Spectroscopy and Chemometric Analyses
- Advanced Image Processing Techniques
- Nanoplatforms for cancer theranostics
- Optical Coherence Tomography Applications
- Thermography and Photoacoustic Techniques
- Wireless Communication Networks Research
- Computer Graphics and Visualization Techniques
- Optical Imaging and Spectroscopy Techniques
- Maritime Navigation and Safety
- Non-Destructive Testing Techniques
- Safety Systems Engineering in Autonomy
- Image and Video Quality Assessment
- Risk and Safety Analysis
- Advanced MIMO Systems Optimization
- Image and Signal Denoising Methods
- IPv6, Mobility, Handover, Networks, Security
- Advanced Chemical Sensor Technologies
- Network Traffic and Congestion Control
- Optical Polarization and Ellipsometry
- Advanced Optical Sensing Technologies
- Advanced Optical Imaging Technologies
Nanyang Technological University
2017-2022
Universität Hamburg
2013
Hamburg University of Technology
2013
Jilin University
2010
Optical imaging through or inside scattering media, such as multimode fiber and biological tissues, has a significant impact in biomedicine yet is considered challenging due to the strong nature of light. In past decade, promising progress been made field, largely benefiting from invention iterative optical wavefront shaping, with which deep-tissue high-resolution focusing hence becomes possible. Most reported algorithms can overcome small perturbations on noise level but fail effectively...
Coherent optical control within or through scattering media via wavefront shaping has seen broad applications since its invention around 2007. Wavefront is aimed at overcoming the strong scattering, featured by random interference, namely speckle patterns. This randomness occurs due to refractive index inhomogeneity in complex like biological tissue modal dispersion multimode fiber, yet this actually deterministic and potentially can be time reversal precompensated. Various approaches, such...
Information retrieval from visually random optical speckle patterns is desired in many scenarios yet considered challenging. It requires accurate understanding or mapping of the multiple scattering process, reliable capability to reverse compensate for scattering-induced phase distortions. In whatever situation, effective resolving and digitization are necessary. Nevertheless, on some occasions, increase acquisition speed and/or signal-to-noise ratio (SNR), speckles captured by cameras...
A novel "guide star" assisted photoacoustic (GSPA) method for noninvasive glucose measurement has been proposed. Instead of receiving PA signals that are directly generated by tissue, a virtual photodiode is employed to amplify the signal difference regarding amplitude and peak arrival time caused concentration variations in an indirect way. Being different from traditional spectroscopy, this can improve sensitivity accuracy optimizing optical path lengths (or tissue thickness). On other...
Acoustic resolution photoacoustic microscopy (AR-PAM) generally suffers from limited depth of focus, which had been extended by synthetic aperture focusing techniques (SAFTs). However, for three dimensional AR-PAM, current one (1D) SAFT and its improved version like cross-shaped do not provide isotropic in the lateral direction. The full potential remains to be tapped. To this end, two (2D) with fast computing architecture is proposed work. Explained geometric modeling Fourier acoustics...
Magnetoacoustic tomography has been demonstrated as a powerful and low-cost multi-wave imaging modality. However, due to limited spatial resolution detection efficiency of magnetoacoustic signal, full potential the remains be tapped. Here we report high-resolution microscopy method, where magnetic stimulation is provided by compact solenoid resonance coil connected with matching network, acoustic reception realized using high-frequency focused ultrasound transducer. Scanning system...
A novel noninvasive microwave biosensor for glucose measurement was designed, developed and tested to show its potential real-time continuous monitoring. The reflected S-parameter S11 investigated with different concentrations within the range of 0.5 ~ 7 g/dL. magnitude resonance frequency information were utilized prediction then combined by data fusion enhance accuracy. results versus reference concentration root-mean-squared errors (RMSE) 0.2887 g/dL 0.1681 respectively. shows RMSE value...
Photoacoustic Microscopy (PAM) optical resolution (OR) imaging method is suited to get high bio-tissue image but suffers from shallow penetration depth. By contrast, photoacoustic acoustic (AR) has deeper depth with degraded resolution. Inspired by the current advances in field of deep neural network (DNN), we proposed a new DNN framework named Prior Residual U-Net (PRU-Net), which combines global residual block and prior for AR OR enhancement. It helps aggregate advantages both methods...
To address the problems of network congestion, Active queue management (AQM) is advocated to improve quality services (QoS) for Internet. Random early detective (RED) algorithm one notably AQM mechanism, because it could reduce high drop rate bursty flows, avoid global synchronization among flows and reduces latency ("ping time"). However, RED requires careful tuning its parameters in order provide good performance. For solving this problem, paper proposes a new mechanism algorithm, which...
A revised version of <br/> Yunqi Luo, Huanhao Li, Ruochong Zhang, Puxiang Lai, and Yuanjin Zheng "Deep learning assisted optical wavefront shaping in disordered medium", Proc. SPIE 10886, Adaptive Optics Wavefront Control for Biological Systems V, 1088612 (20 February 2019); doi: 10.1117/12.2504425 was published on 17 April 2019. Details the revision are provided text that accompanies this Erratum. The original paper has been updated.
User mobility can cause severe degradation of QoS, which be counteracted by performing handovers at the right moment. However, to perform a robust handover is challenging task. In this paper, we study problem for mobile wireless networks in office environment, where users' predictable. We propose new mechanism using Hidden Markov Model (HMM) predict Received Signal Strength (RSS) values. Based on predicted values, each user decision his own preferred making algorithm. Extensive simulations...
Speckles arise when coherent light interacts with biological tissues. Information retrieval from speckles is desired yet challenging, requiring understanding or mapping of the multiple scattering process, reliable capability to reverse compensate for scattering-induced phase distortions. In whatever situation, insufficient sampling undermines encoded information, impeding successful object reconstruction speckle patterns. this work, we propose a deep learning method combat physical limit:...
Optical focusing through/inside scattering media, like multimode fiber and biological tissues, has significant impact in biomedicine yet considered challenging due to strong nature of light. Previously, promising progress been made, benefiting from the iterative optical wavefront shaping, with which deep-tissue high-resolution becomes possible. Most algorithms can overcome noise perturbations but fail effectively adapt beyond noise, e.g. sudden perturbations. Re-optimizations are usually...