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revisiting the ODE Method for recursive Algorithms:Fast Convergence Using Quasi Stochastic Approximation

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Journal of Systems Science & Complexity 2021年第5期34卷 1681-1702页

作者： CHEN Shuhang DEVrAJ Adithya BErSTEIN Andrey MEYN sean Department of Mathematics University of FloridaGainesville FL32605USA Stanford University Stanford CA94305USA NrEL Golden CO80401USA University of Florida Gainesville FL32605USA

Several decades ago,*** Meyn and Lei Guo were postdoctoral fellows at ANU,where they shared interest in recursive *** seems fitting to celebrate Lei Guo’s 60 th birthday with a review of the ODE Method and its recent evolution,with focus on the following themes:The method has been regarded as a technique for algorithm *** is argued that this viewpoint is backwards:The original stochastic approximation method was surely motivated by an ODE,and tools for analysis came much later(based on establishing robustness of Euler approximations).The paper presents a brief survey of recent research in machine learning that shows the power of algorithm design in continuous time,following by careful approximation to obtain a practical recursive *** these methods are usually presented in a stochastic setting,this is not a *** fact,recent theory shows that rates of convergence can be dramatically accelerated by applying techniques inspired by quasi *** to conditions,the optimal rate of convergence can be obtained by applying the averaging technique of Polyak and *** conditions are not universal,but theory suggests alternatives to achieve *** theory is illustrated with applications to gradient-free optimization,and policy gradient algorithms for reinforcement learning.

关键词： Learning and adaptive systems in artificial intelligence reinforcement learning stochastic approximation

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Electricity demand forecasting for decentralised energy management

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能源与人工环境(英文) 2020年第2期1卷 178-186页

作者： sean Williams Michael Short School of Computing Engineering&Digital TechnologiesTeesside UniversityTS13BXUK

The world is experiencing a fourth industrial *** development of technologies is advancing smart infrastructure *** observe decarbonisation,digitalisation and decentralisation as the main drivers for *** electrical power systems a downturn of centralised conventional fossil fuel fired power plants and increased proportion of distributed power generation adds to the already troublesome outlook for op-erators of low-inertia energy *** the absence of reliable real-time demand forecasting measures,effective decentralised demand-side energy planning is often *** this work we formulate a simple yet highly effective lumped model for forecasting the rate at which electricity is *** methodology presented focuses on the potential adoption by a regional electricity network operator with inadequate real-time energy data who requires knowledge of the wider aggregated future rate of energy ***,contributing to a reduction in the demand of state-owned generation power *** forecasting session is constructed initially through analysis of a chronological sequence of discrete *** demand data shows behaviour that allows the use of dimensionality reduction *** with piecewise interpolation an electricity demand forecasting methodology is *** of short-term forecasting problems provide credible predictions for energy *** for medium-term forecasts that extend beyond 6-months are also very *** forecasting method provides a way to advance a novel decentralised informatics,optimisa-tion and control framework for small island power systems or distributed grid-edge systems as part of an evolving demand response service.

关键词： Demand response Decentralised Grid edge Time series forecasting

Trends in carbon capture technologies:a bibliometric analysis

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碳中和(英文) 2022年第1期1卷 35-70页

作者： sean ritchie Elena Tsalaporta School of Engineering University College Cork(UCC)College RoadCorkIreland

Climate change is an ever-present issue,which has a vast variety of potential solutions,one of which being carbon *** paper aims to use bibliometric analysis techniques to find trends in carbon capture within the technologies of adsorption,absorption,membranes,and hybrid *** Web of Science core collection database performed bibliometric searches,with the‘Bibliometrix’plug-in for r software,performing the bibliometric *** data spanned across 1997–2020 and the investigation found that adsorption technologies dominated this period in terms of citations and articles,with hybrid technologies being the least produced but rising in scientific productivity and *** Analysis found China and the United States of America to be the dominant producers of articles,with global collaboration being central to carbon ***‘International Journal of Greenhouse Gas Control’ranked as the top producer of articles however,the‘ACS Applied Materials&Interfaces’was the leading journal in terms of H-index.

关键词： Carbon capture Bibliometric analysis Absorption Adsorption Membranes Hybrid carbon capture

Current state of endohepatology: Diagnosis and treatment of portal hypertension and its complications with endoscopic ultrasound

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World Journal of Hepatology 2021年第8期13卷 887-895页

作者： sean r rudnick Jason D Conway Mark W russo Section on Gastroenterology&Hepatology Wake Forest School of MedicineWinston-SalemNC 27157United States Department of Hepatology Atrium HealthCarolinas Medical CenterCharlotteNC 28204United States

The diagnosis and management of cirrhosis and portal hypertension(PH)with its complications including variceal hemorrhage,ascites,and hepatic encephalopathy continues to *** there are established“standards of care”in liver biopsy and measurement of PH,gastric varices remain an area without a universally accepted therapeutic *** concept of“Endo Hepatology”has been used to describe of the applications of endoscopic ultrasound(EUS)to these ***-liver biopsy(EUS-LB)offers an alternative to percutaneous and transjuglar liver biopsy without compromising safety or efficacy,and with added advantages including the potential to reduce sampling error by allowing biopsies in both hepatic ***,EUS-LB can be performed during the same procedure as EUS-guided portal pressure gradient(PPG)measurements,allowing for the collection of valuable diagnostic and prognostic ***-guided PPG measurements provide an appealing alternative to the transjugular approach,with proposed advantages including the ability to directly measure portal vein *** addition,EUS-guided treatment of gastric varices(GV)offers several possible advantages to current ***-guided treatment of GV allows detailed assessment of the vascular anatomy,similar efficacy and safety to current therapies,and allows the evaluation of treatment effect through doppler ultrasound *** appropriate selection of patients for these procedures is paramount to ensuring generation of useful clinical data and patient safety.

关键词： Portal hypertension Endoscopic ultrasound Liver biopsy Gastric varices

Hormones and phenotypic plasticity： Implications for the evolution of integrated adaptive phenotypes

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Current Zoology 2013年第4期59卷 506-525页

作者： sean C. LEMA Jun KITANO Biological Sciences Department Center for Coastal Marine Sciences California Polytechnic State University San Luis Obispo CA 93407-0401 Ecological Genetics Laboratory National Institute of Genetics Mishima Shizuoka Japan

It is generally accepted that taxa exhibit genetic variation in phenotypic plasticity, but many questions remain unan- swered about how divergent plastic responses evolve under dissimilar ecological conditions. Hormones are signaling molecules that act as proximate mediators of phenotype expression by regulating a variety of cellular, physiological, and behavioral re- sponses. Hormones not only change cellular and physiological states but also influence gene expression directly or indirectly, thereby linking environmental conditions to phenotypic development. Studying how hormonal pathways respond to environ- mental variation and how those responses differ between individuals, populations, and species can expand our understanding of the evolution of phenotypic plasticity. Here, we explore the ways that the study of hormone signaling is providing new insights into the underlying proximate bases for individual, population or species variation in plasticity. Using several studies as exem- plars, we examine how a ＇norm of reaction＇ approach can be used in investigations of hormone-mediated plasticity to inform the following： 1） how environmental cues affect the component hormones, receptors and enzymes that comprise any endocrine sig- naling pathway, 2） how genetic and epigenetic variation in endocrine-associated genes can generate variation in plasticity among these diverse components, and 3） how phenotypes mediated by the same hormone can be coupled and decoupled via independent plastic responses of signaling components across target tissues. Future studies that apply approaches such as reaction norms and network modeling to questions concerning how hormones link environmental stimuli to ecologically-relevant phenotypic re- sponses should help unravel how phenotypic plasticity evolves

关键词： Hormone Endocrine reaction norm Developmental plasticity Pleiotropy Ecology Network

Solar Geoengineering to reduce Global Warming—The Outlook remains Cloudy

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Engineering 2022年第2期8卷 6-9页

作者： sean O’Neill Senior Technology Writer

In March 2021,Australia’s Great Barrier reef played host to a rare field test of marine cloud brightening(MCB)*** a seawater mist into the air from the aft of a research ves-sel using a turbine outfitted with novel spray nozzles,researchers watched the resulting white plume rise into the sky(Fig.1)[1].Over the last five years,the reef has suffered multiple mass bleaching events because of ocean warming caused by climate change[2].The MCB project,led by senior lecturer Daniel Harrison of Southern Cross University,Coffs Harbour,Australia,is part of the reef restoration and Adaptation Program[3],a government-backed research and development initiative that aims to“develop,test and risk-assess novel interventions to help keep the reef resilient.”

关键词： Solar warming ocean

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CONFLICT ANALYSIS APPrOACHES FOr INVESTIGATING ATTITUDES AND MISPErCEPTIONS IN THE WAr OF 1812

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Journal of Systems Science and Systems Engineering 2007年第2期16卷 181-201页

作者： Takehiro INOHArA Keith W. HIPEL sean WALKEr Department of Value and Decision Science Tokyo Institute of Technology Tokyo Japan Department of Systems Design Engineering University of Waterloo Waterloo Canada

Formal systems engineering approaches to modeling misperceptions and attitudes are employed within the framework of the graph model for conflict resolution to systematically study the War of 1812 between the United States of America and Great Britain in order to provide enhanced insights into the causes of the war. More specifically, relational definitions for preferences, movements and stability concepts are defined for describing the attitudes and associated behavior of decision makers involved in a conflict. To capture misperceptions of decision makers in the War of 1812, attitudes are studied within the structure of a hypergame. Combining attitudes and misperceptions within the paradigm of the graph model furnishes the flexible analytical tool which demonstrates that misunderstanding of attitudes by Great Britain and the United States may have contributed to the outbreak of this nasty war.

关键词： Attitudes conflict analysis graph model for conflict resolution misperceptions relational stability concepts War of 1812

Machine Learning Turbocharges Structural Biology

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Engineering 2022年第5期8卷 9-11页

作者： sean O’Neill 机构不祥

On 28 January 2022,DeepMind Technologies announced the addition of the proteomes of 27 organisms to its AlphaFold Protein Structures Database(AlphaFold DB),a free online resource for sci-entists[1].DeepMind,the London-based,artificial intelligence(AI)-focused subsidiary of Google’s parent company,Alphabet,selected these proteomes in alignment with the priorities of the World Health Organization.

关键词： Alpha subsidiary charges

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Is it time to abandon the biological species concept? No

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National Science review 2020年第8期7卷 1400-1401页

作者： roger K.Butlin sean Stankowski Department of Animal and Plant Sciences University of Sheffield Department of Marine Sciences University of Gothenburg

The Oxford English Dictionary defines a concept as, ‘an idea of a class of objects, a general notion’. It follows from this definition that a concept cannot be rejected in the way that a hypothesis might be rejected if its predictions are inconsistent with observations. Instead, a concept must be judged by its heuristic value:does it help in making sense of the natural world?

关键词： GENOMICS