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Author: Mitchell Paul Krawiec-Thayer
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Atmospheric chemistry and meteorological measurements produce large heterogeneous datasets that capture complex physical phenomena. Many of the models and analyses carried out on these data fundamentally consist of pattern recognition, regression, and classification tasks. Such activities are extremely amenable to improvement and/or automation with machine learning. My thesis details new machine learning-based tools that I developed during the analysis of measurements collected by the Keutsch group during our field campaigns in Finland, Brazil, and the western United States. Large collaborative datasets inevitably include some times during which not all instruments' measurements are available (due to calibration/zeroing periods, maintenance, etc), and these gaps must be addressed prior to any model or analysis that requires continuous inputs. I discuss the development of several multivariate imputation methods that fill gaps in one data source based on information learned from the other measurements recorded simultaneously. This approach is demonstrated on both ground and flight data using techniques such as lazy learners, regression learners, and artificial neural networks. The concentrations of chemical pollutants near the ground depend on the dynamic height of the lowest layer of the atmosphere. My thesis describes a new method for robust identification of atmospheric structure through novel application of cluster evaluation measures. Finally, I combine this structural information with the chemical measurements to emulate spatial variability in retrievals from satellite instruments.
Author: Mitchell Paul Krawiec-Thayer
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Atmospheric chemistry and meteorological measurements produce large heterogeneous datasets that capture complex physical phenomena. Many of the models and analyses carried out on these data fundamentally consist of pattern recognition, regression, and classification tasks. Such activities are extremely amenable to improvement and/or automation with machine learning. My thesis details new machine learning-based tools that I developed during the analysis of measurements collected by the Keutsch group during our field campaigns in Finland, Brazil, and the western United States. Large collaborative datasets inevitably include some times during which not all instruments' measurements are available (due to calibration/zeroing periods, maintenance, etc), and these gaps must be addressed prior to any model or analysis that requires continuous inputs. I discuss the development of several multivariate imputation methods that fill gaps in one data source based on information learned from the other measurements recorded simultaneously. This approach is demonstrated on both ground and flight data using techniques such as lazy learners, regression learners, and artificial neural networks. The concentrations of chemical pollutants near the ground depend on the dynamic height of the lowest layer of the atmosphere. My thesis describes a new method for robust identification of atmospheric structure through novel application of cluster evaluation measures. Finally, I combine this structural information with the chemical measurements to emulate spatial variability in retrievals from satellite instruments.
Author: Daniel Ellis
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Lenard Lukas Röder
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This work explores a wide range of data analysis and signal processing methods for different possible applications in atmospheric measurements. While these methods and applications span a wide area of disciplines, the evaluation of applicability and limitations and the results of this evaluation show many similarities. In the first study, a new framework for the temporal characterization of airborne atmospheric measurement instruments is provided. Allan-Werle-plots are applied to quantify dominant noise structures present in the time series. Their effects on the drift correction capabilities and measurement uncertainty estimation can be evaluated via simulation. This framework is applied to test flights of an airborne field campaign and reveals an appropriate interval between calibration measurements of 30 minutes. During ground operation, the drift correction is able to reduce the measurement uncertainty from 1.1% to 0.2 %. Additional short-term disturbances during airborne operation increase the measurement uncertainty to 1.5 %. In the second study, the applicability and limitations of several noise reduction methods are tested for different background characteristics. The increase in signal-noiseratio and the added bias strongly depend on the background structure. Individual regions of applicability show almost no overlap for the different noise reduction methods. In the third study, a fast and versatile Bayesian method called sequential Monte Carlo filter is explored for several applications in atmospheric field experiments. This algorithm combines information provided via the measurements with prior information from the dominant chemical reactions. Under most conditions the method shows potential for precision enhancement, data coverage increase and extrapolation. Limitations are observed that can be analyzed via the entropy measure and improvements are achieved via the extension by an additional activity parameter. In the final study, state-of-the-art neural network architectures and appropriate data representations are used to reduce the effect of interference fringes in absorption spectroscopy. Using the neural network models as an alternative to linear fitting yields a large bias which renders the model approach not applicable. On the task of background interpolation the neural network approach shows robust de-noising behavior and is shown to be transferable to a different absorption spectrometer setup. Application of the interpolation to the test set lowers the detection limit by 52%. This work highlights the importance of in-depth analysis of the effects and limitations of advanced data analysis techniques to prevent biases and data artifacts and to determine the expected data quality improvements. An elaboration of the limitations is particularly important for deep learning applications. All presented studies show great potential for further applications in atmospheric measurements.
Author: Jon Paul Janet
Publisher: American Chemical Society
ISBN: 0841299005
Category : Science
Languages : en
Pages : 189
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Book Description
Recent advances in machine learning or artificial intelligence for vision and natural language processing that have enabled the development of new technologies such as personal assistants or self-driving cars have brought machine learning and artificial intelligence to the forefront of popular culture. The accumulation of these algorithmic advances along with the increasing availability of large data sets and readily available high performance computing has played an important role in bringing machine learning applications to such a wide range of disciplines. Given the emphasis in the chemical sciences on the relationship between structure and function, whether in biochemistry or in materials chemistry, adoption of machine learning by chemistsderivations where they are important
Author: Qingsheng Wang
Publisher: John Wiley & Sons
ISBN: 1119817501
Category : Technology & Engineering
Languages : en
Pages : 324
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Book Description
Introduces Machine Learning Techniques and Tools and Provides Guidance on How to Implement Machine Learning Into Chemical Safety and Health-related Model Development There is a growing interest in the application of machine learning algorithms in chemical safety and health-related model development, with applications in areas including property and toxicity prediction, consequence prediction, and fault detection. This book is the first to review the current status of machine learning implementation in chemical safety and health research and to provide guidance for implementing machine learning techniques and algorithms into chemical safety and health research. Written by an international team of authors and edited by renowned experts in the areas of process safety and occupational and environmental health, sample topics covered within the work include: An introduction to the fundamentals of machine learning, including regression, classification and cross-validation, and an overview of software and tools Detailed reviews of various applications in the areas of chemical safety and health, including flammability prediction, consequence prediction, asset integrity management, predictive nanotoxicity and environmental exposure assessment, and more Perspective on the possible future development of this field Machine Learning in Chemical Safety and Health serves as an essential guide on both the fundamentals and applications of machine learning for industry professionals and researchers in the fields of process safety, chemical safety, occupational and environmental health, and industrial hygiene.
Author: G. B. Pant
Publisher: Springer
ISBN: 3319616544
Category : Science
Languages : en
Pages : 155
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Book Description
This book analyzes the issues associated with climate change in the Himalayas. The purpose of choosing the Himalayas as a focus is because it is a particularly fragile mountain system, highly sensitive to climate change impacts, and it contains one of the largest human populations affected by climate change. The book provides extensive data and information regarding the climate history of the Himalayas, and the current effects of climate change on Himalayan weather systems, and on human and animal populations in the region. The book begins with an overview of global climate change with discussions of data trends and international initiatives, then segues into a history of climate changes and weather trends in the Himalayas. Weather systems of the Himalayas, both past and current, are analyzed and detailed through climate models, seasonal observations of weather fronts, and overviews of various climate scenarios. The book then discusses climate change impacts and signat ures specific to the Central Himalayan region, where the largest effects of impacts are observed. Readers will discover analysis presented on water resources, meteorological changes, biodiversity, agriculture and human health along with perspectives of management and policy. This book will appeal to researchers studying climate science, climatology, environmental scientists and policymakers.
Author: Lavanya Sharma
Publisher: CRC Press
ISBN: 1040030823
Category : Computers
Languages : en
Pages : 311
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Book Description
This book presents the latest developments in deep learning-enabled healthcare tools and technologies and offers practical ideas for using the IoT with deep learning (motion-based object data) to deal with human dynamics and challenges including critical application domains, technologies, medical imaging, drug discovery, insurance fraud detection and solutions to handle relevant challenges. This book covers real-time healthcare applications, novel solutions, current open challenges, and the future of deep learning for next-generation healthcare. It includes detailed analysis of the utilization of the IoT with deep learning and its underlying technologies in critical application areas of emergency departments such as drug discovery, medical imaging, fraud detection, Alzheimer's disease, and genomes. Presents practical approaches of using the IoT with deep learning vision and how it deals with human dynamics Offers novel solution for medical imaging including skin lesion detection, cancer detection, enhancement techniques for MRI images, automated disease prediction, fraud detection, genomes, and many more Includes the latest technological advances in the IoT and deep learning with their implementations in healthcare Combines deep learning and analysis in the unified framework to understand both IoT and deep learning applications Covers the challenging issues related to data collection by sensors, detection and tracking of moving objects and solutions to handle relevant challenges Postgraduate students and researchers in the departments of computer science, working in the areas of the IoT, deep learning, machine learning, image processing, big data, cloud computing, and remote sensing will find this book useful.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 456
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: K.P. Soman
Publisher: PHI Learning Pvt. Ltd.
ISBN: 8120334353
Category : Computers
Languages : en
Pages : 495
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Book Description
Support vector machines (SVMs) represent a breakthrough in the theory of learning systems. It is a new generation of learning algorithms based on recent advances in statistical learning theory. Designed for the undergraduate students of computer science and engineering, this book provides a comprehensive introduction to the state-of-the-art algorithm and techniques in this field. It covers most of the well known algorithms supplemented with code and data. One Class, Multiclass and hierarchical SVMs are included which will help the students to solve any pattern classification problems with ease and that too in Excel. KEY FEATURES Extensive coverage of Lagrangian duality and iterative methods for optimization Separate chapters on kernel based spectral clustering, text mining, and other applications in computational linguistics and speech processing A chapter on latest sequential minimization algorithms and its modifications to do online learning Step-by-step method of solving the SVM based classification problem in Excel. Kernel versions of PCA, CCA and ICA The CD accompanying the book includes animations on solving SVM training problem in Microsoft EXCEL and by using SVMLight software . In addition, Matlab codes are given for all the formulations of SVM along with the data sets mentioned in the exercise section of each chapter.
Author: Olivier Boucher
Publisher: Springer
ISBN: 9401796491
Category : Science
Languages : en
Pages : 322
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Book Description
This textbook aims to be a one stop shop for those interested in aerosols and their impact on the climate system. It starts with some fundamentals on atmospheric aerosols, atmospheric radiation and cloud physics, then goes into techniques used for in-situ and remote sensing measurements of aerosols, data assimilation, and discusses aerosol-radiation interactions, aerosol-cloud interactions and the multiple impacts of aerosols on the climate system. The book aims to engage those interested in aerosols and their impacts on the climate system: graduate and PhD students, but also post-doctorate fellows who are new to the field or would like to broaden their knowledge. The book includes exercises at the end of most chapters. Atmospheric aerosols are small (microscopic) particles in suspension in the atmosphere, which play multiple roles in the climate system. They interact with the energy budget through scattering and absorption of solar and terrestrial radiation. They also serve as cloud condensation and ice nuclei with impacts on the formation, evolution and properties of clouds. Finally aerosols also interact with some biogeochemical cycles. Anthropogenic emissions of aerosols are responsible for a cooling effect that has masked part of the warming due to the increased greenhouse effect since pre-industrial time. Natural aerosols also respond to climate changes as shown by observations of past climates and modelling of the future climate.
