A5020842373- Adaptive optics and wavefront sensing
- Ultrasonics and Acoustic Wave Propagation
- Dynamics and Control of Mechanical Systems
- Vibration and Dynamic Analysis
- Optical measurement and interference techniques
- Stellar, planetary, and galactic studies
- Structural Health Monitoring Techniques
- Seismic Waves and Analysis
- Gear and Bearing Dynamics Analysis
- Fluid Dynamics and Vibration Analysis
- Geophysical Methods and Applications
- Advanced X-ray Imaging Techniques
- Image Processing Techniques and Applications
- Text Readability and Simplification
- Railway Engineering and Dynamics
- Optical Polarization and Ellipsometry
- Structural Engineering and Vibration Analysis
- Image and Video Quality Assessment
- Metal Forming Simulation Techniques
- Advanced Fiber Optic Sensors
- Drilling and Well Engineering
- CCD and CMOS Imaging Sensors
- Advanced Vision and Imaging
- Topic Modeling
- Network Traffic and Congestion Control
Seattle University
2021
Amazon (United States)
2021
Cornell University
2015-2018
National Taiwan University
1995-2014
Bandwidth estimation and congestion control for real-time communications (i.e., audio video conferencing) remains a difficult problem, despite many years of research. Achieving high quality experience (QoE) end users requires continual updates due to changing network architectures technologies. In this paper, we apply reinforcement learning the first time problem (RTC), where seek optimize user-perceived quality. We present initial proof-of-concept results, learn an agent sending rate in RTC...
This paper presents the results of measuring Rayleigh wave as well longitudinal velocities in a concrete specimen using transient elastic waves. The surface generated by steel ball impact on material is studied detail and then method for determination velocity based cross-correlation proposed. determined wavefront arrival wave. A special triggering device accurate time origin utilized. measured both are good agreement with those utilizing conventional ultrasonic method. It noted that...
This paper presents a method for the detection of normal surface-breaking crack in plate using impact-induced transient elastic waves. First, forward simulations diffracted wave propagations with are made by heterogeneous finite difference formulation. The important characteristics initial part waveforms addressed. Second, experimental studies on crack-induced waves also and results accordance numerical results. Finally, nonlinear optimization algorithm based simplex is developed to recover...
This paper presents a result on the measurements of longitudinal and Rayleigh wave velocities in concrete plate using horizontally polarized conical transducers. The characteristics surface responses due to point source applied at half-space are analyzed discussed. analyses show that horizontal component skimming wavefront is much larger than its vertical component. suggests utilization response detect wavefront. In addition, theoretical analysis shows by determine velocity,...
Many wavefront reconstruction techniques estimate the amplitude and phase from multiple intensity measurements. One can generate diversity among these measurements by varying certain parameters in optical system. These are subject to noise disturbances, which might strongly degrade accuracy of reconstruction. In this paper we present use stochastic filtering system variables a multiple-image retrieval framework. An iterated extended Kalman filter is shown effectively reduce normalized...
Automation of alignment tasks can provide improved efficiency and greatly increase the flexibility an optical system. Current systems with automated capabilities are typically designed to include a dedicated wavefront sensor. Here, we demonstrate self-aligning method for reconfigurable system using only focal plane images. We define two lens eight degrees freedom. Images simulated given misalignment parameters ZEMAX software. perform principal component analysis (PCA) on dataset obtain...
Large-scale pretrained transformer models have demonstrated state-of-the-art (SOTA) performance in a variety of NLP tasks. Nowadays, numerous are available different model flavors and languages, can be easily adapted to one’s downstream task. However, only limited number for dialogue tasks, particular, goal-oriented In addition, the trained on general domain language, creating mismatch between pretraining language launguage. this contribution, we present CS-BERT, BERT millions dialogues...
Iterative amplitude and phase retrieval algorithms have been proven to accurately reconstruct arbitrary wavefronts from multiple intensity measurements when system parameters are known exactly, given the ability induce diversity between images. Such sets of images with can be generated by moving a lens in optical system, but any position error on will degenerate reconstruction result. We demonstrate use an expectation-maximization algorithm Kalman smoothing for recovering both complex field...
This paper propose an model-based estimation and control method for off-axis parabolic mirror (OAP) alignment. Current studies in automated optical alignment systems typically require additional wavefront sensors. We a self-aligning using only focal plane images captured by the existing camera. Image processing methods Karhunen-Loève (K-L) decomposition are used to extract measurements observer closed-loop system. Our system has linear dynamic state transition, nonlinear mapping from...
Automated alignment of optical systems saves the time and energy needed for manual is required in cases where intervention impossible. This research discusses state estimation misalignment a reimaging system using focal plane sensor. We control two moving lenses to achieve high precision alignments by feeding back estimates calculated from images CCD camera. perform Principal Component Analysis (PCA) on simulated data set. The monochromatic are decoupled into Karhunen- Loève (KL) modes,...
An automated alignment optical system will greatly simplify tasks, increase the flexibility and utility of reconfigurable systems, allow for quick efficient set up distributed systems. In this work, we demonstrate a tilted decentered focal lens using only plane imaging by exploiting aberration effects caused misalignment. A Gaussian beam is passed through with 4 degrees freedom onto science camera. The deformation spot image analyzed to determine tilt shift misalignments on lens. Corrections...
A response to the comment made by John S. Popovics in a Letter Editor commenting on paper ‘‘Determination of elastic constants concrete specimen using transient waves [J. Acoust. Soc. Am. 98, 2142–2148 (1995)]’’ is presented.