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- 实验方案
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[IEEE 2018 IEEE 27th Asian Test Symposium (ATS) - Hefei, China (2018.10.15-2018.10.18)] 2018 IEEE 27th Asian Test Symposium (ATS) - Test Diagnosis of Digital Microfluidic Biochips Using Image Segmentation
摘要： Digital micro?uidic biochip has been developed as a promising alternative to the traditional approach of benchtop laboratory tests. Dependability is an important biochemical attribute for micro?uidic biochips that are used for safety-critical applications, such as point-of-care health assessment, air-quality monitoring, and food-safety testing. Therefore, the robust of?ine and online test techniques are required after manufacturing and during bioassay operations. In this work, we are presenting an image segmentation based testing methodology to detect the catastrophic faults and to locate the faulty cells. The design-for diagnosability scheme is proposed, and it is shown that faults can be located and tolerated by providing alternative paths in biochips. Moreover this testing method also facilitates the testing of a biochip with other bioassay operations running concurrently.
关键词： fault models,CCD,Biochip,electrowetting,image segmentation,test time
更新于2025-09-04 15:30:14
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Exploring Test–Retest Variability Using High-Resolution Perimetry
摘要： Purpose: Test–retest variability (TRV) of visual field (VF) data seriously degrades our capacity to recognize true VF progression. We conducted repeated high-resolution perimetry with a test interval of 0.58 to investigate the sources of TRV. In particular, we examined whether the spatial variance of the observed sensitivity changes or if their absolute magnitude was of more importance. Methods: Sixteen eyes of 16 glaucoma patients were each tested three times at 61 VF locations along the superior-temporal 458 meridian using a modified protocol of the Octopus 900 perimeter. TRV was quantified as the standard deviation of the repeats at each point (retest-SD). We also computed the mean sensitivity at each point (retest-MS) and the running spatial-SD along the tested meridian. Multiple regression models investigated whether any of those variables (and also age, sex, and VF eccentricity) were significant independent determinants of TRV. Results: The main independent determinants of TRV were the retest-MS at (cid:2)0.04 dB TRV/dB loss (P , 0.0001, t-statistic 5.05), and the retest-SD at 0.47 dB spatial variance/dB loss (P , 0.0001, t-statistic 12.5). Conclusions: The larger effect for the spatial-SD suggested that it was perhaps a stronger determinant of TRV than scotoma depth per se. This might support the hypothesis that rapidly varying interactions between small perimetric stimuli, sensitivity across the field, and normal fixational jitter are strong determinants of TRV. Translational Relevance: Our study indicates that methods that might reduce the effects of jagged sensitivity changes, such as increasing stimulus size or better gaze tracking, could reduce TRV.
关键词： glaucoma,high-resolution perimetry,test–retest variability
更新于2025-09-04 15:30:14
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[IEEE 2018 10th IAPR Workshop on Pattern Recognition in Remote Sensing (PRRS) - Beijing (2018.8.19-2018.8.20)] 2018 10th IAPR Workshop on Pattern Recognition in Remote Sensing (PRRS) - A Novel Ship Segmentation Method Based on Kurtosis Test in Complex-Valued SAR Imagery
摘要： Traditional ship segmentation methods in synthetic aperture radar (SAR) imagery are mainly based on the intensity/amplitude information and cannot take fully advantage of the complex information in SAR imagery. This paper proposes a novel ship segmentation method based on kurtosis test in the complex-valued SAR imagery. It can take benefit of the complex information of the SAR imagery. The segmentation rationale is that sea clutter usually obey a Gaussian distribution while ship targets usually obey a sup-Gaussian distribution. Thus, their kurtosis can be different. Kurtosis is invariant with respect to location shift and positive scale changes. It follows that kurtosis of sea clutter remains approximately constant while the amplitude decreases with the incidence angle increasing. Preliminary experimental results based on Gaofen-3 and Sentinel-1 data show that the proposed method can achieve good performance.
关键词： synthetic aperture radar (SAR),ship segmentation,kurtosis test,Gaussianity,complex-valued
更新于2025-09-04 15:30:14
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[IEEE 2018 International Conference on Emerging Trends and Innovations In Engineering And Technological Research (ICETIETR) - Ernakulam, Cochin, India (2018.7.11-2018.7.13)] 2018 International Conference on Emerging Trends and Innovations In Engineering And Technological Research (ICETIETR) - Statistical Analysis of Monthly Solar Radiations and Wind Speed Data
摘要： Increase in electricity demand has motivated us to move towards renewable energy sources. These energy sources are available abundantly and can never be exhausted. Environmental impacts are much lower than those with conventional energy sources. Therefore, in this study, solar and wind data has been collected at Aurangabad, Maharashtra (Latitude: 19o52’ 3.61” N – Longitude: 75o19’ 23.99” E) for a period of one year and statistical analysis has been carried out. Solar radiation data has been recorded to estimate the level of radiations falling on the same location mentioned above, while the wind speed data has been recorded and analyzed using Weibull and Rayleigh distribution and the best fitting distribution of wind has been found out using goodness of fit tests.
关键词： Weibull,Rayleigh,goodness of fit tests,Chi-Squared test,root mean square error,monthly solar radiation,wind speed,probability density function
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Budapest (2018.7.1-2018.7.5)] 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Investigation on the pulse shape of DC corona discharges in air under varying test voltage level
摘要： A continuous condition assessment of operating equipment makes a significant contribution to the service reliability. In this context the partial discharge diagnosis is of great importance. In contrast to AC applications an established diagnostic tool for DC applications does not exist, even though diverse promising approaches, such as the time domain analysis, are identified. This finding is based on investigations, which are carried out under a constant test voltage level. Consequently, additional research, considering a varying test voltage level and its influence on the pulse shape of partial discharges, is required to reach universally valid statements. Focusing on corona discharges in air, the investigations are carried out by using an optimized broadband measuring system. Whereas the corona discharges are gained from an artificial and idealized defect at high-voltage potential, the measuring system enables to capture the pulse shape devoid of reflection and refraction processes. As characterizing pulse shape parameters, the rise time, the pulse width and the fall time are determined as well as the apparent charge and the repetition rate. The gained values are compared to each other and discussed for different test voltage levels.
关键词： pulse shape parameter,test voltage level,corona discharge,partial discharge,DC voltage
更新于2025-09-04 15:30:14
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Regenerated fiber Bragg grating sensing system for ultrasonic detection in a 900 °C environment
摘要： Heat-resistant composites, such as ceramic matrix composites (CMCs) and heat-resistant carbon fiber reinforced plastics (CFRPs), are expected to be used for aircraft engine parts. The development of reliable heat-resistant composite materials requires the use of nondestructive test (NDT) techniques for evaluating the progression of damage during material testing at elevated temperatures. Furthermore, structural health monitoring (SHM) technologies that operate under harsh environments are expected to be realized for monitoring heat-resistant composite structures. To provide potential solutions for the establishment of such technologies, this research developed a heat-resistant ultrasonic sensor based on a regenerated fiber-optic Bragg grating (RFBG). First, we fabricated an RFBG by annealing a normal FBG sensor. Because the RFBG exhibits high heat resistance at temperatures of 1000 °C, the sensor achieved stable ultrasonic detection at an elevated temperature. In addition, we attempted to use a π-phase-shifted FBG (PSFBG) as the seed grating to construct an ultrasonic sensor with enhanced performance. As a result, the R(PS)FBG sensor possessed a very short effective gauge length and achieved a broad frequency response to ultrasonic waves with frequencies greater than 1.5 MHz. The broadband detectability enables the R(PS)FBG sensor to acquire an accurate response to ultrasonic waves. Hence, we believe the regenerated Bragg grating-based ultrasonic sensors can contribute to establishing an effective nondestructive evaluation method for composite materials, thereby enabling a structural health monitoring system for a composite-made structure operating under extreme high-temperature environments.
关键词： structural health monitoring (SHM),ultrasonic detection,nondestructive test (NDT),regenerated fiber-optic Bragg grating (RFBG),high-temperature environment,Heat-resistant composites
更新于2025-09-04 15:30:14
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A Novel Vision-Based Pose Measurement Method Considering the Refraction of Light
摘要： Nowadays, due to the advantages of non-contact and high-speed, vision-based pose measurements have been widely used for aircraft performance testing in a wind tunnel. However, usually glass ports are used to protect cameras against the high-speed air?ow in?uence, which will lead to a big measurement error. In this paper, to further improve the vision-based pose measurement accuracy, an imaging model which considers the refraction light of the observation window was proposed. In this method, a nonlinear camera calibration model considering the refraction brought by the wind tunnel observation window, was established ?rst. What’s more, a new method for the linear calibration of the normal vector of the glass observation window was presented. Then, combining with the proposed matching method based on coplanarity constraint, the six pose parameters of the falling target could be calculated. Finally, the experimental setup was established to conduct the pose measurement study in the laboratory, and the results satis?ed the application requirements. Besides, experiments for verifying the vision measurement accuracy were also performed, and the results indicated that the displacement and angle measurement accuracy approximately increased by 57% and 33.6%, respectively, which showed the high accuracy of the proposed method.
关键词： pose parameters,machine vision,refraction,triangular vision,wind tunnel test
更新于2025-09-04 15:30:14
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Responsive Upconversion Nanoprobe for Background‐Free Hypochlorous Acid Detection and Bioimaging
摘要： Responsive nanoprobes play an important role in bioassay and bioimaging, early diagnosis of diseases and treatment monitoring. Herein, a upconversional nanoparticle (UCNP)-based nanoprobe, Ru@UCNPs, for specific sensing and imaging of hypochlorous acid (HOCl) is reported. This Ru@UCNP nanoprobe consists of two functional components, i.e., NaYF4:Yb, Tm UCNPs that can convert near infrared light-to-visible light as the energy donor, and a HOCl-responsive ruthenium(II) complex [Ru(bpy)2(DNCH-bpy)](PF6)2 (Ru-DNPH) as the energy acceptor and also the upconversion luminescence (UCL) quencher. Within this luminescence resonance energy transfer nanoprobe system, the UCL OFF–ON emission is triggered specifically by HOCl. This triggering reaction enables the detection of HOCl in aqueous solution and biological systems. As an example of applications, the Ru@UCNPs nanoprobe is loaded onto test papers for semiquantitative HOCl detection without any interference from the background fluorescence. The application of Ru@UCNPs for background-free detection and visualization of HOCl in cells and mice is successfully demonstrated. This research has thus shown that Ru@UCNPs is a selective HOCl-responsive nanoprobe, providing a new way to detect HOCl and a new strategy to develop novel nanoprobes for in situ detection of various biomarkers in cells and early diagnosis of animal diseases.
关键词： imaging,nanoprobes,paper-based test strips,bioassay and bioimaging,luminescence resonance energy transfer,selective HOCl detection and imaging
更新于2025-09-04 15:30:14