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Prognostics of lumen maintenance for High power white light emitting diodes using a nonlinear filter-based approach

Jiajie Fan, Kam-Chuen Yung, Michael Pecht
2014 Reliability Engineering & System Safety  
High power white light emitting diodes (HPWLEDs), with advantages in terms of luminous efficacy, energy saving, and reliability, have become a popular alternative to conventional luminaires as white light  ...  To improve the prediction accuracy, we present in this paper a nonlinear filter-based prognostic approach (the recursive Unscented Kalman Filter) to predict the lumen maintenance of HPWLEDs based on the  ...  Acknowledgments The work described in this paper was partially supported by a grant from the Research Committee of The Hong Kong Polytechnic University and was also partially supported by a grant from  ... 
doi:10.1016/j.ress.2013.10.005 fatcat:xljuima56bauxc6vg2ksgh6iya

Lumen Degradation Lifetime Prediction for High Power White LEDs based on the Gamma Process Model

Mesfin Seid Ibrahim, JiaJie Fan, Winco K.C. Yung, Zeyu Wu, Bo Sun
2019 IEEE Photonics Journal  
This phenomenon is manifested in the lighting industry, especially for the high power white light-emitting diodes (LEDs) as these products have a long lifetime and high reliability.  ...  A stochastic approach based on gamma distributed degradation (GDD) is proposed in this study to estimate the long-term lumen degradation lifetime of phosphor-converted white LEDs.  ...  The complexity of the LED-based lights and their failure mechanisms could be the reason for such variability in the prognostics of white light pc-LEDs.  ... 
doi:10.1109/jphot.2019.2950472 fatcat:wls4pualqbgo5fdzp46lndr4yi

Color Shift Failure Prediction for Phosphor-Converted White LEDs by Modeling Features of Spectral Power Distribution with a Nonlinear Filter Approach

Jiajie Fan, Moumouni Guero Mohamed, Cheng Qian, Xuejun Fan, Guoqi Zhang, Michael Pecht
2017 Materials  
With the expanding application of light-emitting diodes (LEDs), the color quality of white LEDs has attracted much attention in several color-sensitive application fields, such as museum lighting, healthcare  ...  The spectral power distribution (SPD), defined as the radiant power distribution emitted by a light source at a range of visible wavelength, contains the most fundamental luminescence mechanisms of a light  ...  The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.  ... 
doi:10.3390/ma10070819 pmid:28773176 pmcid:PMC5551862 fatcat:a22yo7ce5fc3zb7pna53b25cmm

Prognostics of Radiation Power Degradation Lifetime for Ultraviolet Light-Emitting Diodes using Stochastic Data-driven Models

Jiajie Fan, Zhou Jing, Yixing Cao, Mesfin Seid Ibrahim, Min Li, Xuejun Fan, Guoqi Zhang
2021 Energy and AI  
With their advantages of high efficiency, long lifetime, compact size and being free of mercury, ultraviolet lightemitting diodes (UV LEDs) are widely applied in disinfection and purification, photolithography  ...  However, it is challenging to assess the reliability of UV LEDs based on the traditional life test or even the accelerated life test.  ...  , the Six Talent Peaks Project in Jiangsu Province (GDZB-017), and the Fundamental Research Funds for the Central Universities ( B200203031 ).  ... 
doi:10.1016/j.egyai.2021.100066 fatcat:jfsvt5ogzvcb5ak34tmdgmvxiu

Investigating Pharmacology In Vivo Using Magnetic Resonance and Optical Imaging

Jorge Ripoll, Vasilis Ntziachristos, Catherine Cannet, Anna Louise Babin, Rainer Kneuer, Hans-Ulrich Gremlich, Nicolau Beckmann
2008 Drugs in RD  
Tissue collection is invariably linked to a period of global ischaemia for a specimen, which affects energy me-  ...  Acknowledgements An important advantage of imaging is that tissue is analyzed in its host environment. Possible No sources of funding were used to assist in the preparation of this review.  ...  Using sensitive detection devices such as ample, laser diodes operating at a frequency close to photomultiplier tubes or cooled charge-coupled dethat of the detected light; the emitted fluorescent vices  ... 
doi:10.2165/00126839-200809050-00001 pmid:18720999 fatcat:qjjdvy2l6bczjp3uilc7ofwkiy

A design methodology for 2D sparse NDE arrays using an efficient implementation of refracted-ray TFM

Jerzy Dziewierz, Timothy Lardner, Anthony Gachagan
2013 2013 IEEE International Ultrasonics Symposium (IUS)  
A second technology uses ultrasound to noninvasively control the microstructure of collagen within engineered tissues.  ...  Recent advances in the field of tissue engineering include the engineering of skin, cartilage, and bladder, all of which are relatively thin tissues that can rely on diffusion for the delivery of oxygen  ...  The authors acknowledge the ANR and DGA for their support under the project Metactif, grant ANR-11-ASTR-015.  ... 
doi:10.1109/ultsym.2013.0035 fatcat:th5znfh7y5bklfdbmhb4u6iq2i

Thermal management and humidity based prognostics of high-power LED packages

Thong Kok Law
2019
While Light Emitting Diodes (LEDs) hold much potential as the future of lighting, the high junction temperatures generated during usage result in higher than expected degradation rates and premature failures  ...  This has led to indeterminate use and consequentially, a lack of understanding of humidity based failures.  ...  Fan et al. depict a particle filter-based approach [76] based on both Sequential Monte Carlo and Bayesian techniques to predict the lumen maintenance life.  ... 
doi:10.5525/gla.thesis.74278 fatcat:dho2dqmqdzb5hpsmjnv7yusb5m

AACR/SNMMI State-of-the-Art Molecular Imaging in Cancer Biology and Therapy: Abstracts

C. J. Anderson, C. Contag, D. Piwnica-Worms
2015 Journal of Nuclear Medicine  
Moreover, standard white-light endoscopy does not offer any molecular information.  ...  Using a semiconductor-based deep sequencing approach, we were able to consistently sequence these samples with reliable coverage for data analysis.  ...  Therefore, we investigated the potential use of 18 F-FDG-PET as an early response biomarker for PI3K pathway targeting therapies in a trastuzumab-resistant HER-2 overexpressing breast cancer model.  ... 
doi:10.2967/jnm562abs pmid:25645299 fatcat:5pq4swz4kvd4tlg5fobmuncdlq

Solid-State Lasers [chapter]

Rahul Yadav
2018 Encyclopedia of Ophthalmology  
CW solid-state lasers provide higher average power output as they use diode lasers for pumping, which is very efficient.  ...  The filtered rays deposit their energy into a scintillation crystal that converts the emitted gamma rays into multiple visible light photons which move through the crystal to an arrangement of high-sensitivity  ...  When a thorough fundoscopic examination is insufficient to establish the presence of a serous detachment of the sensory retina with a high degree of certainty, ancillary tests should be used to complement  ... 
doi:10.1007/978-3-540-69000-9_669 fatcat:hzsgogaq4zfm3h3455bvg2assm

Proceedings of the World Molecular Imaging Congress 2021, October 5-8, 2021: General Abstracts

2022 Molecular Imaging and Biology  
Conclusions: An efficient, iterative deconvolution algorithm with a novel resolution subsets-based approach that operates on patient DICOM images has been used for quantitative improvement in MRI clinical  ...  An efficient rapidly converging deconvolution algorithm with a novel resolution subsets-based approach RSEMD for improving the quantitative accuracy of previously reconstructed clinical MRI images by commercial  ...  Using serial image-based ROI data from 4-48h p.i., prospective Lu-177 dosimetry was estimated assuming complete local absorption of β particles only.  ... 
doi:10.1007/s11307-021-01693-y pmid:34982365 pmcid:PMC8725635 fatcat:4sfb3isoyfdhfbiwxfr55gvqym

Habilitation à diriger des recherches

2006 Recherches en psychanalyse  
Results given for in vivo patient data illustrate the ability of the algorithm to give coherent panoramic images in the case of bladders.  ...  Phantoms are used to evaluate the global mosaicing accuracy and the limits of the registration algorithm.  ...  -A. D'Hallewin from Cancer Institute CAV, Nancy, France, for their clinical experience and for providing video sequences of various cystoscopic examinations.  ... 
doi:10.3917/rep.005.0119 fatcat:4hgix6p5cnbivfx323xsz74ex4

ECR 2016 Book of Abstracts - A - Postgraduate Educational Programme

2016 Insights into Imaging  
The success rate for filter retrieval is in fact quite high, with one large filter registry (CIRSE IVC Filter retrieval registry) showing a 92% success rate for retrieval in a series of over 600 patients  ...  for a prognostic evaluation.  ...  To understand imaging features and prognostic implications of tumours of the brain and spine. A-734 10:33 A. Congenital and white matter disorders of the brain A.  ... 
doi:10.1007/s13244-016-0474-9 pmid:26873353 pmcid:PMC4762839 fatcat:itxslbcacjhh3kixfkcwmdbt44

ECR 2011 Book of Abstracts - A - Postgraduate Educational Programme

2011 Insights into Imaging  
The success rate for filter retrieval is in fact quite high, with one large filter registry (CIRSE IVC Filter retrieval registry) showing a 92% success rate for retrieval in a series of over 600 patients  ...  for a prognostic evaluation.  ...  To understand imaging features and prognostic implications of tumours of the brain and spine. A-734 10:33 A. Congenital and white matter disorders of the brain A.  ... 
doi:10.1007/s13244-011-0078-3 pmid:23100070 pmcid:PMC3533621 fatcat:qa3ln4hhvve2hhumgwwnmykgoe

ECR 2015 Book of Abstracts - A - Postgraduate Educational Programme

2015 Insights into Imaging  
The success rate for filter retrieval is in fact quite high, with one large filter registry (CIRSE IVC Filter retrieval registry) showing a 92% success rate for retrieval in a series of over 600 patients  ...  for a prognostic evaluation.  ...  To understand imaging features and prognostic implications of tumours of the brain and spine. A-734 10:33 A. Congenital and white matter disorders of the brain A.  ... 
doi:10.1007/s13244-015-0386-0 pmid:25708993 pmcid:PMC4349897 fatcat:m7eyvqcwojfpvf3lr5hy6dwjb4

ECR 2013 Book of Abstracts - A - Postgraduate Educational Programme

2013 Insights into Imaging  
The success rate for filter retrieval is in fact quite high, with one large filter registry (CIRSE IVC Filter retrieval registry) showing a 92% success rate for retrieval in a series of over 600 patients  ...  for a prognostic evaluation.  ...  To understand imaging features and prognostic implications of tumours of the brain and spine. A-734 10:33 A. Congenital and white matter disorders of the brain A.  ... 
doi:10.1007/s13244-013-0227-y pmid:23468009 pmcid:PMC3666656 fatcat:yitsk227mba2pl7wcypouf6tz4
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