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Understanding electricity prices beyond the merit order principle using explainable AI

Energy and AI 2023年第3期13卷 149-159页

作者： Julius Trebbien Leonardo Rydin Gorjao aaron Praktiknjo Benjamin Schafer Dirk Witthaut Forschungszentrum Julich Institute for Energy and Climate Research–Systems Analysis and Technology Evaluation(IEK-STE)52428 JülichGermany University of Cologne Institute for Theoretical PhysicsZülpicher Str.7750937 CologneGermany Faculty of Science and Technology Norwegian University of Life Sciences1432 AsNorway Chair for Energy System Economics Institute for Future Energy Consumer Needs and Behavior(FCN)E.ON Energy Research CenterRWTH Aachen UniversityMathieustr.1052074 AachenGermany Institute for Automation and Applied Informatics Karlsruhe Institute of Technology76344 Eggenstein-LeopoldshafenGermany JARA-ENERGY 52074 AachenGermany

Electricity prices in liberalized markets are determined by the supply and demand for electric power,which are in turn driven by various external influences that vary strongly in *** perfect competition,the merit order principle describes that dispatchable power plants enter the market in the order of their marginal costs to meet the residual load,*** difference of load and renewable *** market models are based on this principle when attempting to predict electricity prices,yet the principle is fraught with assumptions and simplifications and thus is limited in accurately predicting *** this article,we present an explainable machine learning model for the electricity prices on the German day-ahead market which foregoes of the aforementioned assumptions of the merit order *** model is designed for an ex-post analysis of prices and builds on various external *** SHapley Additive exPlanation(SHAP)values we disentangle the role of the different features and quantify their importance from empiric data,and therein circumvent the limitations inherent to the merit order *** show that load,wind and solar generation are the central external features driving prices,as expected,wherein wind generation affects prices more than solar ***,fuel prices also highly affect prices,and do so in a nontrivial ***,large generation ramps are correlated with high prices due to the limited flexibility of nuclear and lignite ***,we offer a model that describes the influence of the main drivers of electricity prices in Germany,taking us a step beyond the limited merit order principle in explaining the drivers of electricity prices and their relation to each other.

关键词： Electricity prices Merit order principle Explainable artificial intelligence Machine learning Fuel prices Energy market

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Efficient Convex Optimization Approaches to Variational Image Fusion

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Numerical Mathematics(Theory,Methods and Applications) 2014年第2期7卷 234-250页

作者： Jing Yuan Brandon Miles Greg Garvin Xue-Cheng Tai aaron Fenster Medical Imaging Lab Robarts Research InstituteUniversity of Western OntarioLondon ONCanada N6A 5B7 Department of Medical Imaging St Jospeh’s HealthCareLondon ONCanada Department of Mathematics University of BergenBergenNorway

Image fusion is an imaging technique to visualize information from multiple imaging sources in one single image,which is widely used in remote sensing,medical imaging *** this work,we study two variational approaches to image fusion which are closely related to the standard TV-L_(2) and TV-L_(1) image approximation *** investigate their convex optimization formulations,under the perspective of primal and dual,and propose their associated new image decomposition *** addition,we consider the TV-L_(1) based image fusion approach and study the specified problem of fusing two discrete-constrained images f_(1)(x)∈L_(1) and f_(2)(x)∈L_(2),where L_(1) and L_(2) are the sets of linearly-ordered discrete *** prove that the TV-L_(1) based image fusion actually gives rise to the exact convex relaxation to the corresponding nonconvex image fusion constrained by the discretevalued set u(x)∈L_(1)∪L_(2).This extends the results for the global optimization of the discrete-constrained TV-L_(1) image approximation[8,36]to the case of image *** a big numerical advantage of the two proposed dual models,we show both of them directly lead to new fast and reliable algorithms,based on modern convex optimization *** with medical images,remote sensing images and multi-focus images visibly show the qualitative differences between the two studied variational models of image *** also apply the new variational approaches to fusing 3D medical images.

关键词： Convex optimization primal-dual programming combinatorial optimization totalvariation regularization image fusion

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Crosstalk of the Wnt/b-catenin pathway with other pathways in cancer cells

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Genes & Diseases 2016年第1期3卷 41-47页

作者： Saint-aaron L.Morris Suyun Huang Department of Neurosurgery The University of Texas MD Anderson Cancer Center1515 Holcombe BoulevardHoustonTX 77030USA Program in Cancer Biology The University of Texas Graduate School of Biomedical Sciences6767 Bertner AvenueMitchell Building BSRB S3.8344HoustonTX 77030USA

Many cancers have similar aberrations in various signaling cascades with crucial roles in cellular proliferation,differentiation,and *** of signal cascades that play integral roles during early cellular development is well known to be a central feature of many *** such signaling cascade is the Wnt/b-catenin pathway,which has a profound effect on stem cell proliferation,migration,and *** pathway is dysregulated in numerous cell types,underscoring its global oncogenetic *** review highlights regulators and downstream effectors of this receptor cascade and addresses the increasingly apparent crosstalk of Wnt with other tumorigenic signaling *** understanding of the genetic and epigenetic changes unique to these malignancies increases,identifying the regulatory mechanisms unique to the Wnt/b-catenin pathway and similarly aberrant receptor pathways will be imperative.

关键词： b-catenin Cell signaling Glioma stem cell Tumorigenicity Wnt

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Evaluation of large language models for the classification of medical device software

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Bio-Design and Manufacturing 2024年第5期7卷 819-822页

作者： Yu Han aaron Ceross Florence Bourgeois Paulo Savaget Jeroen H.M.Bergmann Department of Engineering Science University of OxfordOld Road CampusOxford OX37QDUK Harvard-MIT Center for Regulatory Science Harvard Medical SchoolBostonMAUSA Computational Health Informatics Program(CHIP) Boston Children’s HospitalBostonMAUSA Department of Technology and Innovation The University of Southern DenmarkOdenseDenmark

Amidst the rapidly expanding integration of large language models(LLMs)across various sectors(ranging from everyday applications to specialized fields demanding stringent regulatory adherence),our investigation seeks to determine how well these models can support medical device software *** device classification functions to systematically categorize devices according to their designated use,associated risk levels,and requisite regulatory oversight,thereby providing a structured framework for ensuring safety and efficacy as mandated by regulatory authorities.

关键词： everyday demanding thereby

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An examination of thematic research,development,and trends in remote sensing applied to conservation agriculture

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International Soil and Water Conservation Research 2024年第1期12卷 77-95页

作者： Zobaer Ahmed aaron Shew Lawton Nalley Michael Popp V.Steven Green Kristofor Brye Center for Advanced Spatial Technologies University of ArkansasFayettevilleARUSA Environmental Dynamics Program University of ArkansasFayettevilleARUSA Department of Agricultural Economics and Agribusiness University of ArkansasFayettevilleARUSA College of Agriculture Arkansas State UniversityJonesboroARUSA University of Arkansas System Division of Agriculture Little RockARUSA Department of Crop Soiland Environmental SciencesUniversity of ArkansasFayettevilleARUSA

Conservation agriculture seeks to reduce environmental degradation through sustainable management of agricultural *** the 1990s,agricultural research has been conducted using remote sensing technologies;however,few previous reviews have been conducted focused on different conservation management *** of the previous literature has focused on the application of remote sensing in agriculture without focusing exclusively on conservation practices,with some only providing a narrative review,others using biophysical remote sensing for quantitative estimates of the bio-geo-chemical-physical properties of soils and crops,and few others focused on single agricultural management *** paper used the preferred reporting items for systematic review(PRISMA)methodology to examine the last 30 years of thematic research,development,and trends associated with remote sensing technologies and methods applied to conservation agriculture research at various spatial and temporal scales.A set of predefined key concepts and keywords were applied in three databases:Scopus,Web of Science,and Google Scholar.A total of 188 articles were compiled for initial examination,where 68 articles were selected for final analysis and grouped into cover crops,crop residue,crop rotation,mulching,and tillage *** on conservation agriculture research using remote sensing have been increasing since 1991 and peaked at 10 publications in *** the 68 articles,94%used a pixel-based,while only 6%used an object-based classification *** to 2005,tillage practices were abundantly studied,then crop residue was a focused theme between 2004 and *** 2012 to 2020,the focus shifted again to cover *** spectral indices were used in 76%of the 68 *** examination offered a summary of the new potential and identifies crucial future research needs and directions that could improve the contribution of remote sensing to the provision of long-term operat

关键词： Remote sensing Conservation agriculture Classification algorithm Spatial resolution Satellite Spectral indices PRISMA

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Trends in feed evaluation for poultry with emphasis on in vitro techniques

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Animal Nutrition 2021年第2期7卷 268-281页

作者： Faegheh Zaefarian aaron J.Cowieson Katrine Pontoppidan M.Reza Abdollahi Velmurugu Ravindran Monogastric Research Centre School of Agriculture and EnvironmentMassey UniversityPalmerston North 4442New Zealand DSM Nutritional Products Wurmisweg 576KaiseraugstSwitzerland Novozymes A/S DK-2800 KgsLyngbyDenmark

Accurate knowledge of the actual nutritional value of individual feed ingredients and complete diets is critical for efficient and sustainable animal *** this reason,feed evaluation has always been in the forefront of nutritional *** evaluation for poultry involves several approaches that include chemical analysis,table values,prediction equations,near-infrared reflectance spectroscopy,in vivo data and in vitro digestion *** these,the use of animals(in vivo)is the most valuable to gain information on nutrient utilization and is more predictive of bird ***,in vivo methods are expensive,laborious and *** is therefore important to establish in vitro methods that are reliable,rapid and practical to assess the nutritional quality of feed ingredients or complete *** of the technique is crucial,as poor prediction will have a negative impact on bird performance and,increase feed cost and environmental *** this review,the relevance and importance of feed evaluation in poultry nutrition will be highlighted and the various approaches to evaluate the feed value of feed ingredients or complete diets will be *** in and practical limitations encountered in feed evaluation science,with emphasis on in vitro digestion techniques,will be discussed.

关键词： Poultry Feed evaluation In vivo assay In vitro techniques Protein Energy

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The Trilateral Relations Between the US,China, and the Philippines:a Model of Interaction Between One Small State and Two Big Powers

The Trilateral Relations Between the US,China, and the Phili...

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作者： aaron Jed Rabena（瑞杰龙）山东大学

学位级别：硕士

本文主要考察了一个小国与两个大国之间的互动关系。案例分析选取了作为小国的菲律宾与美国和中国的互动。本研究的重要性是要厘清在三边关系形成中发挥作用的变量,包括内在的或称体系的因素、国际组织等新行为体的作用等。为研究三边... 详细信息

本文主要考察了一个小国与两个大国之间的互动关系。案例分析选取了作为小国的菲律宾与美国和中国的互动。本研究的重要性是要厘清在三边关系形成中发挥作用的变量,包括内在的或称体系的因素、国际组织等新行为体的作用等。为研究三边关系中,各种主要的和复杂的关系,本文借助有关理论工具构建起了三边关系的互动框架,这有助于我们弄清楚互动关系的各种类型与层次。上述分析框架有助于我们把握菲律宾、美国与中国互动关系的整体图景。美国总统巴拉克·奥巴马近期关于重返亚洲的声明引起了广泛关注：美国将如何制定一个新的再同盟战略?这对美国在该地区的外交、政治、安全和经济利益有很大影响——它是国际关系主要方面。在国际体系中,国家有不同的能力,扮演不同角色。比如小国,中等国家,还有大国。在本文的案例中涉及三边关系中一个小国和两个大国组成一个特殊的权力分布。国家行为主要遵循现实主义和新现实主义理解,或者自由主义,建构主义和新自由主义理论。在后冷战世界,考虑到经济作为所有国家的生命线具有更高的重要性,国家已经倾向于后者。一个小国与一个大国的关系可能是独立的、协调的、缓和的、交战的、服从的、一致的、结盟的、追随的和不对称的。大国与其他国家的关系可能是均势的、保护的、相互依赖的、对称的和战略伙伴关系。因此,三角形成为一个新聚会的舞台,它使双方关系成为三边关系,诱发有关偏好与敌对的选择。考虑到许多结构自由主义机制的诞生,三边关系现在是复杂的。比如联合国及东盟,这些非国家行为体常常伴随着非传统安全和跨国家议题,它们引起了许多国家的注意。需要指出,国际制度作为新加入的变量发挥重要作用,它的重要性体现在国际组织会议和峰会上,领导人进行会谈和讨论。因此,国际组织延伸了国家领导人的互动,比通常国家互访更具个人和非正式的色彩。在这样的互动过程中,为新行动路线提出、新思想和新提议能撇开单纯的峰会议事日程谈话而达到效果。互惠限制只可能发生在一种情况,即当所有制国家——无论小国、中等中国或大国都被成员国身份约束在一个国际机制中,并由一揽子政策保证所有国家服从——无论国家大小。这种方式,较小国家通过政策安全网能邀请较大国家加入。同时,较大国家通过它们的成员国身份也能塑造一些小国的偏好,并影响整个组织。本质上,双边关系发生变化将影响到三边关系中的另一方,并影响整个三边互动关系发生结构上的转变。这种影响可能是包含的、排异的或是交互影响的。判定该互动模型有两点：一是必须考察小国和大国的互动,二是两大国具有互动关系。我们认为,两个大国中其一为地区性大国,另一为世界大国很重要。考虑到历史、政治系统、利益、国家角色、价值、联盟、伙伴关系、文化和外交政策,小国的互动将与两大国都不相同。不同于冷战期间存在于中美苏之间的战略三角关系,从新现实主义和新自由主义理论观点中产生出的每个双方和三方更像是实用主义关系。三方关系中的双方关系层面至关重要,因为两个国家间的互动会对第三国产生一个有利的和不利的结果,这个结果会改变总体看法和整个三方的互动结构模式。对于菲律宾作为一个小国如何与两个大国互动,大国间关系也是独立变量。因此,有不同的互动模式存在。首先,是“直接/正面互动”,意思是国家间仅有政府与政府的关系;其次是“间接/侧面互动”,意味着一种通过其他体系行为体发生的互动,比如以国家为成员的政府间组织(例如APEC, ASEAN, ARF)。最后是“秩序和偏好(OP)互动”,它指的是一个国家如何对其诉求的秩序或权力利益进行排序。第四种可能的互动是“排除异者互动”。两个国家根据他们自己共同或战略利益选择达成一致和安排。因此偶然而并非故意地排除另一个利益不在此的国家。第五种互动形式是“中心偏好(PP)互动”。它是这样一种情势,一个国家通过均势和捭阖,相对于其他两国获取最为有利的位置。诚如在其外交政策实践中所体现的,菲律宾与美国与中国的关系对其外交至关重要,也要以实体身份适应东盟和联合国并负起制定发现和参与政策的责任。菲律宾作为国家,在其与美国和中国的关系中,通过东盟和亚太经合组织间接地和有扩大地发展正面的外交纽带关系。经济上,两个大国都是菲律宾最大的贸易伙伴,由于自由贸易协定和特惠贸易协定也是最大的利益方。在政治方面,菲律宾与两个大国有重要的合作,却仅与美国有着相似的政治价值和体系。菲律宾与中国通过双边官员交流和政府间组织的方式有着合作。在安全方面,菲律宾与美国有共同防御条约。这个依赖性条约包括传统和非传统安全的关注点。由于不平等、协议规定违宪和不平衡的关系,同盟一度受到质疑。中国方面,有关于南中国海的领土争端。双边和东盟方面都在关注这个问题。在社会文化方面,由于都是亚洲国家,菲律宾深受中国儒家文化和价值体系影响,其中社会和孝道方面有广泛的共鸣,而美国对菲律宾有西方

关键词：影响角度多维外溢三边互动框架准战略三角阴影外交

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Aerosol jet printing of surface acoustic wave microfluidic devices

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Microsystems & Nanoengineering 2024年第1期10卷 231-242页

作者： Joseph Rich Brian Cole Teng Li Brandon Lu Hanyu Fu Brittany N.Smith Jianping Xia Shujie yang Ruoyu Zhong James L.Doherty Kanji Kaneko Hiroaki Suzuki Zhenhua Tian aaron D.Franklin Tony Jun Huang Department of Biomedical Engineering Duke UniversityDurhamNC 27708USA Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA Department of Mechanical Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA 24061USA Thomas Lord Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC 27708USA Deptartment of Precision Mechanics Faculty of Science and EngineeringChuo UniversityTokyo 112-8551Japan Department of Chemistry Duke UniversityDurhamNC 27708USA

The addition of surface acoustic wave(SAW)technologies to microfluidics has greatly advanced lab-on-a-chip applications due to their unique and powerful attributes,including high-precision manipulation,versatility,integrability,biocompatibility,contactless nature,and rapid ***,the development of SAW microfluidic devices is limited by complex and time-consuming micro/nanofabrication techniques and access to cleanroom facilities for multistep photolithography and vacuum-based *** simplify the fabrication of SAW microfluidic devices with customizable dimensions and functions,we utilized the additive manufacturing technique of aerosol jet *** successfully fabricated customized SAW microfluidic devices of varying materials,including silver nanowires,graphene,and poly(3,4-ethylenedioxythiophene)polystyrene sulfonate(PEDOT:PSS).To characterize and compare the acoustic actuation performance of these aerosol jet printed SAW microfluidic devices with their cleanroom-fabricated counterparts,the wave displacements and resonant frequencies of the different fabricated devices were directly measured through scanning laser Doppler ***,to exhibit the capability of the aerosol jet printed devices for lab-on-a-chip applications,we successfully conducted acoustic streaming and particle concentration ***,we demonstrated a novel solution-based,direct-write,single-step,cleanroom-free additive manufacturing technique to rapidly develop SAW microfluidic devices that shows viability for applications in the fields of biology,chemistry,engineering,and medicine.

关键词： printing wave fluid

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SELECTED PAPERS FROM IEEE/CIC ICCC 2018

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China Communications 2019年第9期16卷 15-17页

作者： Zhiyong Feng Shuguang Cui T. aaron Gulliver Zhiqing Wei BUPT Beijing Peoples R China Stanford Univ Elect Engn Stanford CA 94305 USA Univ Victoria Elect Engn Victoria BC Canada Carleton Univ Acad Appointments Ottawa ON Canada Univ Canterbury Christchurch New Zealand

IEEE/CIC International Conference on Communication in China(ICCC)is one of the flagship conferences in Asian-Pacific region held by IEEE Communication Society(ComSoc)and China Institute of Communication(CIC).IEEE/CIC ICCC 2018 was held in Beijing,China,on August 16-18,*** key theme is“Ubiquitous Network,Intelligence and Society”,which broadly covers the theoretical and practical innovations in the area of *** technical program of IEEE/CIC ICCC 2018 features 6 world-class keynote speeches which are presented by Weihua Zhuang(Fellow of IEEE,Royal Society of Canada,Canadian Academy of Engineering,and Engineering Institute of Canada),Abbas Jamalipour(Fellow of IEEE,IEICE,and Institution of Engineers Australia),Tao Zhang,Ying-Chang Liang(IEEE Fellow),James Kimery,and Sumei Sun(IEEE Fellow).

关键词： Canada Intelligence Institution

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The calculus of violence

The calculus of violence

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作者： aaron Sheehan-Dean.

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