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7篇 您的检索式:作者名="Bobby Ghosh"
    题名 作者 年代 出处 被引量
1Ensemble learning-iterative training machine learning for uncertainty quantification and automated experiment in atom-resolved microscopy显示文摘Deep learning has emerged as a technique of choice for rapid feature extraction across imaging disciplines,allowing rapid conversion of the data streams to spatial or spatiotemporal arrays of features of interest.However,applications of deep learning in experimental domains are often limited by the out-of-distribution drift between the experiments,where the network trained for one set of imaging conditions becomes sub-optimal for different ones.This limitation is particularly stringent in the quest to have an automated experiment setting,where retraining or transfer learning becomes impractical due to the need for human intervention and associated latencies.Here we explore the reproducibility of deep learning for feature extraction in atom-resolved electron microscopy and introduce workflows based on ensemble learning and iterative training to greatly improve feature detection.This approach allows incorporating uncertainty quantification into the deep learning analysis and also enables rapid automated experimental workflows where retraining of the network to compensate for out-of-distribution drift due to subtle change in imaging conditions is substituted for human operator or programmatic selection of networks from the ensemble.This methodology can be further applied to machine learning workflows in other imaging areas including optical and chemical imaging.Ayana Ghosh Bobby G.Sumpter Ondrej Dyck Sergei V.Kalinin Maxim Ziatdinov 2021npj Computational Materials2021,,1:1
2Bridging microscopy with molecular dynamics and quantum simulations: an atomAI based pipeline显示文摘Recent advances in (scanning) transmission electron microscopy have enabled a routine generation of large volumes of high-veracity structural data on 2D and 3D materials,naturally offering the challenge of using these as starting inputs for atomistic simulations.In this fashion,the theory will address experimentally emerging structures,as opposed to the full range of theoretically possible atomic configurations.However,this challenge is highly nontrivial due to the extreme disparity between intrinsic timescales accessible to modern simulations and microscopy,as well as latencies of microscopy and simulations per se.Addressing this issue requires as a first step bridging the instrumental data flow and physics-based simulation environment,to enable the selection of regions of interest and exploring them using physical simulations.Here we report the development of the machine learning workflow that directly bridges the instrument data stream into Python-based molecular dynamics and density functional theory environments using pre-trained neural networks to convert imaging data to physical descriptors.The pathways to ensure structural stability and compensate for the observational biases universally present in the data are identified in the workflow.This approach is used for a graphene system to reconstruct optimized geometry and simulate temperature-dependent dynamics including adsorption of Cr as an ad-atom and graphene healing effects.However,it is universal and can be used for other material systems.Ayana Ghosh Maxim Ziatdinov Ondrej Dyck Bobby G.Sumpter Sergei V.Kalinin 2022npj Computational Materials2022,,1:0
3流化床气流磨在陶瓷工业中的应用显示文摘许多耐磨的陶瓷粉体需要经过粉碎和分级以满足粒度分布的要求。加工碳化物、氮化物、硼化物、氧化铝及其陶瓷超细粉体原料的设备之一是气流磨。Bobby Ghosh 郑水林 1994国外建材科技1994,15,3:0
4精彩无极限显示文摘梅西是上帝赐给人间的天使和精灵,他纯真、善良、阳光且热情,他的技术美轮美奂,他忠诚、感恩的品格诠释了人性中最美好的内容。梅西是球迷的宠儿,是足球的完美化身,任何荣誉都仅仅是用来衬托这朵天使之花的绿叶,属于梅西的时代已经到来。Bobby Ghosh 张国庆(译注) 2012英语广场2012,,10:0
5世界杯让卡塔尔获得外交红利显示文摘在卡塔尔赢得四年一度的世界杯举办权近12年后,距离开赛只有几天之遥的时候,卡塔尔人或许有理由怀疑,在这件事上如此费神费力是否值得。世界杯非但没有给这个石油国家带来与国际体育赛事相关的声望,反而带来了不必要的关注(尤其是它对外籍劳工的剥削和对性的态度),以及对它“体育洗白”(sportswashing)糟糕人权记录的指责。Bobby Ghosh 简远(译) 2022商业周刊(中文版)2022,,21:0
6我的英雄!显示文摘印度宝莱坞电影明星沙米·卡普尔(1931-2011)于今年8月中旬去世。他出身电影世家,长相英俊,声音响亮,演技精湛,在印度,乃至世界许多地方都享有很高的声誉和影响。本文既为纪念卡普尔,同时也向读者阐明:真正的、优秀的艺术家不仅能娱乐大众,还可以减少人们之间的误会、隔阂,甚至敌意。这大概也就是中国古人所谓的'观乎人文,以化成天下'的意思吧。Bobby Ghosh 陈文炳 2011英语文摘2011,,12:0
7Caseous mitral annular calcifications: Multimodality imaging characteristics显示文摘The authors report herein a series of 3 patients with caseous mitral annular calcifications (MAC). One of the patients presented with mass-like, caseous MAC as an incidental finding on a staging computed tomography (CT) for metastatic colorectal carcinoma. Another patient presented with a nodule on a chest radiograph, which was later found on CT to be due to caseous MAC. In the third patient, caseous MAC was initially detected on echocardiography, and was further evaluated with CT and cardiac magnetic resonance imag-ing. In all three patients, the appearances posed a diagnostic dilemma. The appearance of caseous MAC is dissimilar to non-caseous MAC and is usually seen as an ovoid, mass-like structure, with homogeneous hyperattenuation, representing a liquefied form of calcium and proteinaceous fluid. This homogeneous center is surrounded by peripheral, shell-like calcifications. Caseous MAC is likely an under-recognized entity and may present a diagnostic dilemma at CT, magnetic resonance imaging, or echocardiography.Jabi Shriki Christine Rongey Bobby Ghosh Samuel Daneshvar Partick M Colletti Ali Farvid Alison Wilcox 2010World Journal of Radiology2010,2,4:0
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