Academic literature on the topic 'Generic initial ideals'
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Journal articles on the topic "Generic initial ideals"
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Caviglia, Giulio, and Enrico Sbarra. "Zero-generic initial ideals." Manuscripta Mathematica 148, no. 3-4 (May 6, 2015): 507–20. http://dx.doi.org/10.1007/s00229-015-0748-4.
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Bigatti, A. M., A. Conca, and L. Robbiano. "Generic Initial Ideals and Distractions." Communications in Algebra 33, no. 6 (May 2005): 1709–32. http://dx.doi.org/10.1081/agb-200058217.
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Draisma, Jan, Michał Lasoń, and Anton Leykin. "Stillman’s conjecture via generic initial ideals." Communications in Algebra 47, no. 6 (April 16, 2019): 2384–95. http://dx.doi.org/10.1080/00927872.2019.1574806.
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Murai, Satoshi. "Generic initial ideals and squeezed spheres." Advances in Mathematics 214, no. 2 (October 2007): 701–29. http://dx.doi.org/10.1016/j.aim.2007.03.004.
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Murai, Satoshi, and Pooja Singla. "Rigidity of Linear Strands and Generic Initial Ideals." Nagoya Mathematical Journal 190 (2008): 35–61. http://dx.doi.org/10.1017/s0027763000009557.
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Let K be a field, S a polynomial ring and E an exterior algebra over K, both in a finite set of variables. We study rigidity properties of the graded Betti numbers of graded ideals in S and E when passing to their generic initial ideals. First, we prove that if the graded Betti numbers for some i > 1 and k ≥ 0, then for all q ≥ i, where I ⊂ S is a graded ideal. Second, we show that if for some i > 1 and k ≥ 0, then for all q ≥ 1, where I ⊂ E is a graded ideal. In addition, it will be shown that the graded Betti numbers for all i ≥ 1 if and only if I(k) and I(k+1) have a linear resolution. Here I(d) is the ideal generated by all homogeneous elements in I of degree d, and R can be either the polynomial ring or the exterior algebra.
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DANIŞ, Bekir. "A short note on generic initial ideals." TURKISH JOURNAL OF MATHEMATICS 45, no. 3 (May 20, 2021): 1444–48. http://dx.doi.org/10.3906/mat-2008-106.
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Danış, Bekir, and Müfit Sezer. "Generic initial ideals of modular polynomial invariants." Journal of Pure and Applied Algebra 224, no. 6 (June 2020): 106255. http://dx.doi.org/10.1016/j.jpaa.2019.106255.
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Conca, Aldo, and Jessica Sidman. "Generic initial ideals of points and curves." Journal of Symbolic Computation 40, no. 3 (September 2005): 1023–38. http://dx.doi.org/10.1016/j.jsc.2005.01.009.
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Àlvarez Montaner, Josep. "Local cohomology of binomial edge ideals and their generic initial ideals." Collectanea Mathematica 71, no. 2 (September 29, 2019): 331–48. http://dx.doi.org/10.1007/s13348-019-00268-z.
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Kaveh, Kiumars, Christopher Manon, and Takuya Murata. "Generic tropical initial ideals of Cohen-Macaulay algebras." Journal of Pure and Applied Algebra 225, no. 11 (November 2021): 106713. http://dx.doi.org/10.1016/j.jpaa.2021.106713.
Full textDissertations / Theses on the topic "Generic initial ideals"
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Kamran, Sami. "Semi-empirical and ab initio study of the ideal strengths and elastic properties of covalent crystals and FCC metals." Thesis, University of Ottawa (Canada), 2008. http://hdl.handle.net/10393/27595.
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The present thesis consists of a number of studies on the elastic properties of covalently bonded crystals, the ideal strengths of a selection of face-centred cubic (FCC) metals and the anomalously large shear modulus of iridium.
Semi-empirical formulae for both bulk modulus B and shear modulus G of covalent crystals were elaborated in terms of bond length and ionicity fraction of the bonding. The resulting equations can be applied to a broad selection of covalent materials and their predictions are in good agreement with the experimental data and the results from first-principles calculations. Furthermore, the correlation between the ratio G/B and the aforementioned bonding parameters was investigated. The analysis of this relationship demonstrates that the bond length is the predominant parameter responsible for the brittle features of covalent materials.
The ideal shear and tensile strengths of FCC transition metals were examined through density functional theory (DFT)-based computations. These results allowed establishing a new indicator of ductility, namely the ratio of ideal shear strength to ideal tensile strength taum/sigma <111>. Moreover, it was found that palladium can sustain a surprisingly long range of deformation. Based on the analysis of density of states (DOS) curves, it is suggested that creation of angular features is responsible for the notable amount of distortion suffered by palladium.
The electronic origin of the anomalously large elastic modulus and intrinsic brittleness of FCC iridium were studied using ab initio DFT-based calculations. The electron localisation function (ELF) and bond orders (BO) of iridium and a selection of FCC metals were calculated and then used to evaluate the directionality and the strength of the bonds. The analysis of the trend of bond strength versus elastic moduli, Cauchy pressure and the ratio of shear modulus over bulk modulus suggests that the bond strength is the primary factor that causes the abnormally high modulus of iridium and its intrinsic brittleness.
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Feng, Ting-shiang, and 馮庭祥. "On the Generic Initial Ideals." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/35007204929215650041.
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碩士國立中正大學
數學所
95
This thesis is a report on the study of the generic initial ideal of a given homogeneous ideal in a polynomial ring S = k[x1, . . . , xn] where x1, · · · , xn are indeterminant over the field k. It is well-known that in the proof of the Hilbert Basis Theorem, there is a special concept about the monomial ideal generated by the initial terms of the members of an ideal I. When this ideal I is homogeneous and one is given an element g 2 GLn(k), one can have an action g on I which gives another homogeneous ideal g · I. This action can be viewed as a generic coordinate change. When a group G GLn(k) is given, for example the Borel subgroup of GLn(k), one is interesting in finding the invariants under G. The generic initial ideal associated to a homogeneous ideal I gives us an approach to this problem.
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Schmitz, Kirsten. "Generic Tropical Varieties." Doctoral thesis, 2011. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201104278080.
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The field of algebraic tropical geometry establishes a deep connection between algebraic geometry and combinatorics by associating to certain classical algebraic varieties so called tropical varieties, which are polyhedral complexes in some real vectorspaces. Tropical varieties are closely related to the Groebner complexes of the ideal defining the classical variety. In this thesis the tropical variety of an ideal is studied under a generic change of coodinates. Analogously to the existence of generic initial ideals the existence of generic Groebner complexes and generic tropical varieties is proved. Moreover, it is shown that in the constant coefficient case information on the invariants dimension, Hilbert-Samuel multiplicity and depth of the corresponding coordinate rings can be obtained from generic tropical varieties.
Books on the topic "Generic initial ideals"
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Klaver, Jan Marten Ivo. The Apologia. Edited by Frederick D. Aquino and Benjamin J. King. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780198718284.013.23.
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John Henry Newman’s autobiographical Apologia pro vita sua is generally seen as the book that rehabilitated his public reputation for integrity. This chapter retraces Newman’s handling of Kingsley’s initial accusation, and delineates the subsequent genesis of the book. The chapter looks in detail at how his contemporaries reacted in the press to its contents, and argues that modern critics have been blinded by Newman’s eloquence. The nineteenth-century reception of Apologia shows that, although early critics generally approved of Newman’s sincerity, they still remained highly critical of his theological ideas. The chapter also examines the limits and conditions of autobiographical writing in general and how Newman used the genre as a strategy to vindicate his name. Lastly, it addresses the way recent scholarship has changed the modern perception of the Apologia.
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Gross, Steven, and Georges Rey. Innateness. Edited by Eric Margolis, Richard Samuels, and Stephen P. Stich. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780195309799.013.0014.
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The article describes to what extent the structures and contents of the mind are innate, and to what extent they are learned or otherwise acquired from the environment. Aristotle argued that all ideas are derived from experience by a causal process in which forms (or properties of things) in the external world are transmitted into the mind. John Locke insisted that the simple ideas are derived from sensation, and all other ideas are constructed from the simple ones by the mental operations of compounding, comparing, and abstracting. Sober emphasized that there is no common currency with which to compare the relative contributions of genes and environment and suggested that biological determinants do not in general decompose into amounts of genetic versus nongenetic force. Sober suggested that there might not be a single specification of relevant environments and one might need to fix the range pragmatically as it varies with explanatory interests. Ariew suggested that what matters for innateness is whether a trait's emergence is sensitive to certain specific kinds of environmental factors, where the relevant factors can vary with the trait in question and indeed with one's explanatory interest. Fodor's initial agument for the innateness of concepts was quite simple. He pointed out that standard accounts of learning a trait it as a process of hypothesis confirmation.
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Radner, Hilary, and Alistair Fox. The Digital Challenge: From the Theater to the Gallery. Edinburgh University Press, 2018. http://dx.doi.org/10.3366/edinburgh/9781474422888.003.0003.
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This chapter demonstrates how Bellour’s work on video art (or what was later termed moving-image installation art), while a product of his own preoccupations, is situated firmly within more general speculations about spectatorship. Confronting this new medium, or media, as it turned out, Bellour introduced the notion of “le spectateur pensif,” the pensive spectator, or the spectator engaged in thought – who is not an entirely rational spectator, nor one who is completely sutured into the narrative as some scholars felt was the case with the spectator of classical cinema. He also sees the emergence of new relations between images which he calls “l’entre-images,” the between-images, complicating his initial ideas about the “défilement,” a concept, at least initially, referred to the movement of the celluloid print through the projector’s mechanism and the filing past of the cinema images in front of the spectator. In this same period, Bellour, along with film critics such as Serge Daney and filmmakers like Jean-Luc Godard, began to speculate about the death of cinema due to the changing situations (or dispositifs) in which the spectator encounters the moving image. An important influence on his thinking as this time was the film theorist turned video artist Thierry Kuntzel.
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Mann, Peter. Newton’s Three Laws. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198822370.003.0001.
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This chapter introduces Newton’s laws, the Newtonian formulation of mechanics and key concepts such as configuration space and phase space for later development. In 1687, the natural philosopher Sir Isaac Newton published the Principia Mathematica and, with it, sparked the revolutionary ideas key to all branches of classical physics. In this chapter, the system is the object of interest and is considered to be either a single or a collection of generic particles that are not governed by quantum mechanics, for quantum systems do not follow these laws explicitly. Results for systems of particles and conservation laws are presented as the invariance of a given quantity under time evolution. The N-body problem, first integrals, initial value problems and Galilean transformations are all introduced and the Picard iteration and the Verlet algorithm are discussed.
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Silberstein, Michael, W. M. Stuckey, and Timothy McDevitt. Beyond the Dynamical Universe. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198807087.001.0001.
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Theoretical physics and foundations of physics have not made much progress in the last few decades. There is no consensus among researchers on how to approach unifying general relativity and quantum field theory (quantum gravity), explaining so-called dark energy and dark matter (cosmology), or the interpretation and implications of quantum mechanics and relativity. In addition, both fields are deeply puzzled about various facets of time including, above all, time as experienced. This book argues that this impasse is the result of the “dynamical universe paradigm,” the idea that reality fundamentally comprises physical entities that evolve in time from some initial state according to dynamical laws. Thus, in the dynamical universe, the initial conditions plus the dynamical laws explain everything else going exclusively forward in time. In cosmology, for example, the initial conditions reside in the Big Bang and the dynamical law is supplied by general relativity. Accordingly, the present state of the universe is explained exclusively by its past. A completely new paradigm (called Relational Blockworld) is offered here whereby the past, present, and future co-determine each other via “adynamical global constraints,” such as the least action principle. Accordingly, the future is just as important for explaining the present as the past is. Most of the book is devoted to showing how Relational Blockworld resolves many of the current conundrums of both theoretical physics and foundations of physics, including the mystery of time as experienced and how that experience relates to the block universe.
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Crowl, Linda, Susan Fisher, Elizabeth Webby, and Lydia Wevers. Newspapers and Journals. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199679775.003.0037.
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This chapter examines how novels in Australia, Canada, New Zealand, and the South Pacific were reviewed and publicized, and how readerships were informed and created. Literary journalism in Australia, Canada, New Zealand, and the South Pacific varies according to the populations, histories, and communications infrastructure of each location. In general, a common pattern has been initial evaluations of work against British and European, then latterly American, models, during which time commentators promoted local writing and sketched national ideals for an independent artistic expression. The chapter considers how book reviews were undertaken, as well as the role of reviewers, in newspapers, magazines, literary journals, academic periodicals, and on radio and television programmes. It shows that all the emergent national literatures in English functioned in an increasingly transnational space in the four nations from the 1950s, first under the rubric of Commonwealth literature and then as postcolonial literatures.
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Ginsburg, Jane. Copyright. Edited by Rochelle Dreyfuss and Justine Pila. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198758457.013.23.
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This chapter offers an overview of copyright in general in common law and civil law countries, with an emphasis on the United States (US) and the European Union (EU). It addresses the history and philosophies of copyright (authors’ right), subject matter of copyright (including the requirement of fixation and the exclusion of “ideas”), formalities, initial ownership and transfers of title, duration, exclusive moral and economic rights (including reproduction, adaptation, public performance and communication and making available to the public, distribution and exhaustion of the distribution right), exceptions and limitations (including fair use), and remedies. It also covers the liability of intermediaries, and new copyright obligations concerning technological protections and copyright management information. It concludes with some observations concerning the role of copyright in promoting creativity and free expression.
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Howard Ecklund, Elaine, and Christopher P. Scheitle. Religion vs. Science. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190650629.001.0001.
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Religion vs. Science: What Religious People Really Think busts today’s common myths about science and religion. It reveals several interesting and perhaps surprising realities. The book shows that religious people love much of science. They perceive conflicts only with the forms of science that seem to have implications for God’s role in the world and the value and sacredness of humans. Yet, they are often suspicious of scientists, thinking that scientists generally do not like religious people. Many religious people claim to be young-earth creationists, but they are actually much more open to evolution than this initial label might suggest. Not all religious people deny that the climate is changing, and that it is changing because of humans. And political views more than religious views are really the best predictor of what Americans think about climate change. Further, religious people want to support the environment, as long as love for the environment does not replace love of people. Finally, religious people are supportive of technological advancements, including typically controversial ideas like reproductive genetic technologies and human embryonic stem-cell research, but they want scientists to reflect more on the moral implications of their work. The book ends with practical suggestions and ideas for collaboration among all individuals and communities.
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Hertz, Rosanna, and Margaret K. Nelson. Choice in Donor Sibling Networks. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190888275.003.0012.
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The conclusion of the book explains how relationships within networks of donor siblings begin with the idea of genes. Initially, both parents and children talk about a connection that highlights shared genes. In turn, these shared genes provide both the excitement and the elasticity in donor sibling networks. Ultimately, however, the conclusion argues that what becomes important within these networks is the idea of choice. The parents value connections with others they have come to like; the same is true among the children within a given donor sibling network. The conclusion offers no simple answer to the question of whether connections among genetic relatives can create meaningful bonds that could result in a new kind of voluntary family.
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Raimondi, Fabio. Introduction. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198815457.003.0001.
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In the introduction, the aims of the book and its general approach are specified. Firstly, the book aims to provide an initial response, in a schematic but hopefully sufficiently articulated form, to a central question that Machiavelli raised in the Discourses on Livy: ‘In what mode a free state, if there is one, can be maintained in corrupt cities; or, if there is not, in what mode to order it.’ Secondly, the introduction takes into account the republican and anti-Medicean key used to read Machiavelli’s works. Thirdly, Machiavelli’s modernity and how it contrasts with the idea that modernity is politically State-centric are highlighted. Finally, the possible actuality of the Machiavellian discourse is specified, and a brief map of the book as a guide to the reader is given.
Book chapters on the topic "Generic initial ideals"
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Herzog, Jürgen, and Takayuki Hibi. "Generic initial ideals." In Monomial Ideals, 51–74. London: Springer London, 2011. http://dx.doi.org/10.1007/978-0-85729-106-6_4.
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Green, Mark L. "Generic Initial Ideals." In Six Lectures on Commutative Algebra, 119–86. Basel: Birkhäuser Basel, 1998. http://dx.doi.org/10.1007/978-3-0346-0329-4_2.
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Conca, Aldo, Emanuela De Negri, and Elisa Gorla. "Multigraded Generic Initial Ideals of Determinantal Ideals." In Homological and Computational Methods in Commutative Algebra, 81–96. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61943-9_5.
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Krebs, Kristin, Christine Volkmann, and Marc Grünhagen. "Cultivating the Impact of Sustainable Entrepreneurship: A Discussion of Upscaling Approaches in Entrepreneurial Ecosystems." In FGF Studies in Small Business and Entrepreneurship, 241–64. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11371-0_11.
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AbstractThere is substantial knowledge about the peculiarities of founding entrepreneurial ventures in general. However, comparatively little is known so far about the characteristics of establishing sustainable ventures aiming at solving ecological or social problems in society. It is particularly uncertain how sustainable entrepreneurs could attain a successful upscaling of their venture ideas to expand their impact from a local niche at origin towards reaching broader society-wide impact. At this junction between local niche and the wider societal regime or landscape level, entrepreneurial ecosystems may play a key role in providing instrumental support for sustainable ventures. Entrepreneurial ecosystems offer initial support in the formation of new sustainable ventures but, also later, helping sustainable entrepreneurs in the upscaling of their sustainable venture ideas. In this chapter, we explore how entrepreneurial ecosystems could support the expansion of sustainable ventures and help overcome the barriers and dilemmas for successful sustainability upscaling.The conceptual chapter discusses selected issues in the upscaling of sustainable ventures in the ecosystem context alongside typical barriers and dilemmas in sustainability upscaling. The contribution attempted in this chapter is to build a bridge between the literature strand on upscaling within sustainable innovation and the discussion of supportive ecosystems in the field of entrepreneurship. For example, we address the composition of ecosystem stakeholders and the importance of keeping a shared sustainability orientation in the ecosystem while integrating diverse stakeholders who provide resources for the upscaling process. The discussion in this chapter is based on reviewing recent literature on the upscaling phenomenon in sustainable innovation as well as on entrepreneurial ecosystems and sustainable entrepreneurship. In particular, we suggest that upscaling in entrepreneurial ecosystems may be understood as an open-ended evolutionary process, with ecosystem networks and stakeholder collaboration providing stable spaces for reflexive discourse and learning.
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Winkle, Thomas. "Qualitative Interviews with Developers." In Product Development within Artificial Intelligence, Ethics and Legal Risk, 125–38. Wiesbaden: Springer Fachmedien Wiesbaden, 2022. http://dx.doi.org/10.1007/978-3-658-34293-7_5.
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AbstractThe previous chapters indicate that development approaches using innovative technology or Artificial Intelligence must be reviewed against the background of the increasing demands on interdisciplinary project teams as well as the growing complexity of functions. Interviews with engineers, executive managers and a psychologist from the development department of automobile manufacturers show that a structured guided process increases quality in respect of operational and functional safety. The surveys were conducted using the example of the “Code of Practice for the Design and Evaluation of ADAS” including ISO 26262 requirements. It focused on 1. Success and/or failure of guided development projects; 2. Different perceptions, expectations, ideas and conceptions about the optimal development process; 3. Liability-based product responsibility of the developers and 4. general developer’s attitude to the development process. As one of the insightful results, a practice-oriented guideline with supportive advice “forces” all participants involved in the product development process to sit around a table introducing and discussing their different aspects in a structured way. Through the surveys, the developers were sensitized to the advantages of a guideline-based development process. Often the employees themselves are the best advisors. Each expert contributes to the development of a reliable system through their special field of expertise. The developers concerned are the most aware of the weaknesses and can initiate innovations in companies from the “bottom-up”. A final consulting concept (checklist with 101 questions in Annex B) includes guidelines and requirements and will support the efficient, user-friendly development of new automated vehicle functions.
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Green, Mark, and Michael Stillman. "A Tutorial on Generic Initial Ideals." In Gröbner Bases and Applications, 90–108. Cambridge University Press, 1998. http://dx.doi.org/10.1017/cbo9780511565847.006.
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Snellman, Jan. "Reverse Lexicographic Initial Ideals of Generic Ideals are Finitely Generated." In Gröbner Bases and Applications, 504–18. Cambridge University Press, 1998. http://dx.doi.org/10.1017/cbo9780511565847.032.
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Wellar, Barry. "Developing a Compendium of Ideas on Using the Retrospective Approach to Mine for GIS Nuggets." In Geospatial Research, 459–76. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9845-1.ch019.
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The compendium of ideas paper addresses two needs: 1) Involving more people in the GIS retrospective program; 2) Creating an initial compilation of ideas which promote mining the various literatures – public, learned, popular (media), professional, etc. – for nuggets such as new ways to add to GIS technology, new reasons to add to geospatial information, and, new uses of GIScience research methods. Four design principles (connecting “ideas” and “nuggets”, using a modular approach, limiting modules to those critical to launch the project; and making it easy to modify modules) provide clear directions throughout the compendium-building process. And, each of the four modules (ideas about doing; ideas about objects of attention; principal GIS components as ideas and spawners of ideas; and, ideas as questions and questions as ideas) can be oriented to pursue general or particular interests that are held by all users of GIS technology and GIScience methods, techniques, and operations.
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Coleman, Jonathan RI, Kathryn J. Lester, and Thalia C. Eley. "Therapygenetics." In Genes, brain, and emotions, 396–420. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198793014.003.0026.
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Therapygenetics refers to the prediction of psychological therapy outcomes from genetic markers. The rationale for this research derives from the gene–environment interaction literature, which has shown that individual differences in susceptibility to the environment are at least partly due to genetic variation for a wide range of phenotypes. While initially framed within the context of the diathesis-stress model, this idea has since been developed in a number of ways. Most notably, some genetic markers that place an individual at risk of a poor outcome following a stressful event may reflect environmental susceptibility markers, and thus may also enhance the likelihood of an individual benefiting from a positive environment, including psychological intervention. This chapter reviews the current evidence from candidate gene and genome-wide association studies that genetic factors can explain individual differences in response to psychological therapy. As this is a field in its infancy, future directions and opportunities are outlined. Following an initial discussion on the need to move toward a “therapygenomics” approach utilizing genome-wide methodologies, the importance of identifying mechanisms underlying associations between genes and psychological therapy outcomes is outlined. Finally, the possible future clinical implications of therapygenetics work, both scientific and ethical, are considered.
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Jong, Kenneth De. "Genetic Algorithms: A 30-Year Perspective." In Perspectives on Adaptation in Natural and Artificial Systems. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780195162929.003.0006.
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I continue to be surprised and pleased by the dramatic growth of interest in and applications of genetic algorithms (GAs) in recent years. This growth, in turn, has placed a certain amount of healthy "stress" on the field as current understanding and traditional approaches are stretched to the limit by challenging new problems and new areas of application. At the same time, other forms of evolutionary computation such as evolution strategies [50] and evolutionary programming [22], continue to mature and provide alternative views on how the process of evolution might be captured in an efficient and useful computational framework. I don't think there can be much disagreement about the fact that Holland's initial ideas for adaptive system design have played a fundamental role in the progress we have made in the past thirty years [23, 46]. So, an occasion like this is an opportunity to reflect on where the field is now, how it got there, and where it is headed. In the following sections, I will attempt to summarize the progress that has been made, and to identify critical issues that need to be addressed for continued progress in the field. The widespread availability of inexpensive digital computers in the 1960s gave rise to their increased use as a modeling and simulation tool by the scientific community. Several groups around the world including Rechenberg and Schwefel at the Technical University of Berlin [49], Fogel et al. at the University of California at Los Angeles [22], and Holland at the University of Michigan in Ann Arbor [35] were captivated by the potential of taking early simulation models of evolution a step further and harnessing these evolutionary processes in computational forms that could be used for complex computer-based problem solving. In Holland's case, the motivation was the design and implementation of robust adaptive systems, capable of dealing with an uncertain and changing environment. His view emphasized the need for systems which self-adapt over time as a function of feedback obtained from interacting with the environment in which they operate. This led to an initial family of "reproductive plans" which formed the basis for what we call "simple genetic algorithms" today, as outlined in figure 1.
Conference papers on the topic "Generic initial ideals"
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Blair, Bryan M., and Katja Hölttä-Otto. "Comparing the Contribution of the Group to the Initial Idea in Progressive Idea Generation." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70309.
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Successful Idea Generation (IG) is more likely to lead to original and innovative products. It is usually recommended that idea generation is done in groups. Specifically, progressive idea generation methods, such as 6-3-5/C-Sketch, have been developed to gain from the benefits of group based ideation while being less subject to the peer pressure of a typical brainstorming session, where people can call out ideas simultaneously. In this study, we investigate the contributions that the group makes to the initial ideas in such progressive idea generation. Participants developed concepts for one of two products, namely alarm clocks or litter grabbers. Statistical analysis was used to compare the results of the initial ideas to the entire group for both products. Samples were rated at feature level using three metrics: originality, number of innovation characteristics hit, and feasibility. Results indicate that, in general, the originality and innovativeness of the initial concepts is improved by the rest of the group members. Non-original initial ideas were improved in all four sample groups. Highly original initial ideas also were improved in most cases. Feasibility was generally lowered, but not with statistical significance. Results from the perspective of particular product feature and innovation characteristic categories were varied; some more popular than others.
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Chatterjee, S., D. J. White, and M. F. Randolph. "Lateral Movement of Pipelines on a Soft Clay Seabed: Large Deformation Finite Element Analysis." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49124.
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Large deformation finite element analysis using the commercial software ABAQUS has been performed to study the lateral response of pipelines on a soft seabed. Initially, pipe soil interaction simulations are presented for the case of ideal soil, with non-softening strength. Lateral resistance profiles and trajectories of the pipe during lateral motion are investigated for different initial embedment of the pipe. A more realistic soil model incorporating the effects of strain rate and strain softening is then explored. Lateral resistance profiles and trajectories of the pipes from this realistic model are compared with the ideal soil case. Finally, the concept of effective pipe embedment — which accounts for the geometric changes caused by the soil berm ahead of the pipe — is applied to both the ideal and realistic soil model responses. The normalized horizontal resistance response is shown to be linked to the effective embedment in a simple manner, regardless of the other soil and pipeline parameters. This provides a useful contribution towards the development of a general model for describing large-amplitude lateral pipe-soil interaction, taking due account of the effects of changing geometry and soil strength.
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Humann, James, Newsha Khani, and Yan Jin. "Adaptability Tradeoffs in the Design of Self-Organizing Systems." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60053.
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Self-organizing systems have great potential for adaptability, but as complex systems, they can also be prone to unpredictable behavior, cascading failures, and sensitivity to perturbations. Also, designing systems for adaptability may introduce overhead that reduces their performance. This paper investigates the design tradeoffs between adaptability and performance in the context of a box-pushing task. Using a genetic algorithm to optimize a parametric behavioral model, we are able to test systems optimized under different conditions for performance and reliability. It was found that a system optimized in the face of random initial conditions and internal perturbations was more robust than a system optimized without these perturbations, showing a higher overall fitness over diverse trials, but it could not take advantage of particular initial conditions that would have allowed it to achieve a one-off high fitness in a repeatable environment. A system optimized with predesigned initial conditions was found to achieve a very high fitness, but when it was retested with random initial conditions, its performance plummeted, indicating that it was fit to the ideal initial conditions but not robust.
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Khalili, Nasser, and Amin Ghorbanpour. "Optimal Tuning of Single-Axis Satellite Attitude Control Parameters Using Genetic Algorithm." In ASME 2020 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dscc2020-3212.
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Abstract This paper studies the optimization of control parameters for single-axis attitude control of a rigid satellite using thrusters. It is desired to tune the control parameters to minimize the number of thruster firings. The motion task is defined as an attitude pointing maneuver from arbitrary initial condition to the rest. To this end, a control loop with pulse-width pulse-frequency modulator is suggested. The control actuators are pairs of identical non-ideal thrusters which each one produces torque in one direction around the control axis. A novel approach is proposed to model the dynamics of thruster with a design parameter which shapes the response of the actuator. Nine parameters of the control loop, e.g. feedback gains, modulator parameters, and thruster dynamics, are selected as decision variables. Genetic algorithm is used to find the optimal values of the variables such that the firing is minimized. It is shown that firing minimization requires a sluggish thruster. Moreover, to study the effect of deviation from optimal value on number of thruster firings and fuel consumption, a sensitivity analysis is performed. Based on sensitivity analysis, an optimal range is suggested for each parameter where both number of firing and fuel consumption are minimized.
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Wan, Sha, Yunbao Huang, Qifu Wang, Liping Chen, and Yuhang Sun. "A New Approach to Generic Design Feature Recognition by Detecting the Hint of Topology Variation." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70760.
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Current design feature recognition mainly depends on the connective attributes of edges or faces in the CAD models, such as convexity, concavity, and tangency. However, it is difficult to uniquely define the mixed connective attributes of the generic features in some cases. A novel generic design feature recognition approach by detecting the hint of topology variation is presented in this study. The core idea includes: 1) the resulting CAD model of a complex part is regarded as formed from an initial basic shape such as roughcast and has been operated by introducing generic design features, which subsequently may cause topology variation; 2) Such topology variations, e.g. vertex elimination, edge partition and face alteration, are utilized to obtain generalized properties of the generic design features, dispensing with the connective attributes. Finally, 1) we demonstrate in the experiments that the approach successfully recognizes the main types of generic design features, both isolate and hybrid features. 2) Furthermore, we exhibit the application of the approach in some engineering examples.
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Tan, Chin An, and Shenger Ying. "Active Wave Cancellation of the Axially Moving String." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21479.
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Abstract The active wave control of the linear, axially moving string with general boundary conditions is presented in this paper. Considerations of general boundary conditions are important from both practical and experimental viewpoints. The active control law is established by employing the idea of wave cancellation. An exact, closed-form expression for the transverse response of the controlled system, consisting of the flexible structure, the wave controller, and the sensing and actuation devices, is derived in the frequency domain. Two actuation forces, one upstream and one downstream of an excitation force, are applied. The proposed control law shows that all modes of the string are controlled and the vibration in the regions upstream and downstream of the control forces can be cancelled. However, these results are based on ideal conditions and the assumption of zero initial conditions at the non-fixed boundaries. Effects of non-zero boundary motions at the instant of application of the control forces are examined and the control is shown to be effective under these conditions. The stability and robustness of the control forces are improved by the introduction of a stabilization coefficient in the control law. The effectiveness, robustness and stability of the control forces are demonstrated by simulations and verified by experiments on axially moving belt drive and chain drive systems.
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Wright, Steven A., Paul S. Pickard, Robert Fuller, Ross F. Radel, and Milton E. Vernon. "Supercritical CO2 Brayton Cycle Power Generation Development Program and Initial Test Results." In ASME 2009 Power Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/power2009-81081.
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The DOE Office of Nuclear Energy and Sandia National Labs are investigating supercritical CO2 Brayton cycles as a potentially more efficient and compact power conversion system for advanced nuclear reactors, and other heat sources including solar, geothermal, and fossil or bio fuel systems. The focus of this work is on the supercritical CO2 Brayton cycle which has the potential for both high efficiency, in temperature range (400–750 C), and for reduced capital costs due to very compact turbomachinery. The cycle achieves high efficiency due to the non-ideal behavior of supercritical CO2, and it achieves extremely high power density because the fluid in the turbomachinery is very dense, 10%–60% the density of water. Sandia and its contractor Barber Nichols Inc. have fabricated and are operating a supercritical CO2 (S-CO2) compression test-loop to investigate the key technology issues associated with this cycle. The compression loop is part of a multi-year phased development program to develop a megawatt (MW) heater-class closed S-CO2 Brayton cycle to demonstrate the applicability of this cycle to heat sources above 400 C. Other portions of the program include modifications to the compression loop to operate it as a simple heated Brayton loop by adding a small turbine and a heater, but with no recuperator. The early testing of this simple Brayton cycle is under way. A more ambitious effort is currently constructing a recompression cycle Brayton loop (1) which is some times called a split-flow Brayton cycle. This cycle is used to increase the efficiency of the system by providing large amounts of recuperation using printed circuit heat exchangers. The re-compression (or split-flow) Brayton cycle is designed to operate at 1000 F (538 C) and produce up to 250 kWe with a 1.47″ OD radial compressor and a 2.68″ OD radial turbine. The current compression loop uses a main compressor that is identical to the main compressors in all the Brayton cycles that are being developed at Sandia. The key issues for the supercritical Brayton cycle include the fundamental issues of compressor fluid performance and system control near the critical point. Near the critical point very non ideal fluid behavior is observed which means that standard tools for analyzing compressor performance cannot be used. Thus one of the goals of the program is to develop data that can be used to validate the tools and models that are used to design the turbomachinery. Other supporting technology issues that are essential to achieving efficiency and cost objectives include bearing type, thrust load and thrust load balancing, bearing cooling, sealing technologies, and rotor windage losses. The current tests are providing the first measurements and information on these important supercritical CO2 power conversion system questions. Some of this data is presented in this report. In the testing to date, the turbomachinery has reached maximum speeds of 65,000 rpm, peak flow rates of over 9 lb/s and pressure ratios of just over 1.65. Compressor inlet fluid densities have been varied from 14% to 70% the density of water. Although the data from these tests are only the first results to be analyzed, they indicate that the basic design and performance predictions are sound. The loops have operated the turbo-compressor on the liquid and vapor side of the saturation curve, very near the critical point, above the critical point and even on the saturation dome. We have also operated the compressor near the choked flow regime and even in surge. At the current operating speeds and pressures, the observed performance map data agrees extremely well with the model predictions. These results have positive implications for the ultimate success of the S-CO2 cycle. In general the main compressor shows no adverse behavior while operating over a wide range of normal operating conditions. It operates reliably and with performance values that are very near the predicted results. Future efforts will focus on operating the Brayton cycle loop at sufficiently high temperatures that electrical power can be produced near the end of 2009. The compression-loop hardware is now the test bed for confirming the remaining parameters to support the next stage of development — which is the 1 MW heater-class split-flow or re-compressor Brayton cycle.
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Xiao, Jiaguangyi, Yong Chen, Qichen Zhu, Jun Lee, and Tingting Ma. "A General Ply Design for Aero Engine Composite Fan Blade." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64377.
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Composite fan blade ply lay-up design, which includes ply drop-off/shuffle design and stacking sequence design, makes fan blade structures different from traditional composite structures. It gives designers more freedom to construct high-quality fan blades. However, contemporary fan blade profiles are quite complex and twisted, and fan blade structures are quite different from regular composite structures such as composite laminates and composite wings. The ply drop-off design of a fan blade, especially for a fully 3D fan blade, is still an arduous task. To meet this challenge, this paper develops a ply lay-up way with the help of a software called Fibersim. The fully 3D fan blade is cut into ply pieces in Fibersim. As a result, an initial ply sequence is created and ply shuffle could revise it. Because of the complexity of ply shuffling, the ply shuffle table developed in this paper mainly refers to the design experience gained from simple plate-like laminate structures and some criterion. Besides, the impact of different ply orientation patterns on the reliability of composite fan blade is studied through static and modal numerical analysis. The results show that this ply lay-up idea is feasible for aero engine composite fan blade. Under the calculated rotating speeds, the ply stacking sequence 4 (i.e.[−45°/0°/+45°/0°] with the outer seven groups are [−45°/0°/−45°/0°]) shows the greatest margin of safety compared with other stacking sequences. Modal analysis shows that plies with different angles could have relatively big different impacts on blades vibration characteristics. The composite fan blade ply design route this paper presents has gain its initial success and the results in this paper might be used as basic references for composite blade initial structural design.
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Armandei, Mohammadmehdi, and Antonio Carlos Fernandes. "Performance Improvement and Similarity Analysis for Torsional Galloping Based Turbine." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-42095.
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This paper addresses the innovative turbine for hydrokinetic energy extraction proposed by (Fernandes and Armandei, 2014). This turbine harvests energy via torsional galloping. The turbine consists of a rectangular flat plate located vertically initially aligned with the water current and connected with a torsional spring. By changing the axis position, some experimental tests are conducted to assess the improvements on the performance of the turbine. It is observed that the optimal position for the elastic axis happens when the axis is located at 0.75 of the chord length from the leading edge. This is in accordance with the ideal axis position obtained from the Theodorsen theory reported in a PhD thesis (Armandei, 2013). Also, in order to have estimate of the performance of the turbine in the scaled-up level, a similarity analysis is made. Then the results are modified to find the estimate for the performance of the array of turbines. The comparison between the estimated power of the torsional galloping turbine and some conventional turbine types gives a general idea about how this turbine would operate in full scale.
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Mousavi Bideleh, Seyed Milad, and Viktor Berbyuk. "Multiobjective Optimization of a Railway Vehicle Dampers Using Genetic Algorithm." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12988.
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Ride comfort, safety, wear and vehicle speed are the most important factors in evaluating the efficiency of railway transportation. In order to decrease the track access charges it is often desirable to run the vehicle at maximum allowed speed, while keeping an admissible amount of wear in system. This usually deteriorates the ride comfort and safety level during the operation. Therefore, an optimization problem to find a tradeoff value for vehicle speed and design parameters is inevitable. Since, ride comfort, safety and wear values are sensitive to primary and secondary suspensions’ damping parameters it is desirable to find the optimum values of such design variables. In this regard, the multiobjective optimization of railway vehicle dampers is considered to increase the cost-efficiency of railway operation. One car vehicle model with 26 degrees of freedom (DOF) along with a set of initial states, design parameters and operational conditions is explored here. All bodies are assumed to be rigid. Vehicle carbody and bogie frames supposed to have the full set of DOF in space. While, only lateral and yaw motions are considered for each wheelset. It is also assumed that wheelset roll angle is a function of the lateral displacement. Primary and secondary suspensions compromised of parallel linear springs and dampers in longitudinal, vertical and lateral directions which connect wheelsets to bogie frames, and bogie frames to carbody, respectively. Lagrange formalism is employed to obtain the system’s equations of motion. The nonlinear heuristic theory is chosen to relate creepages and the corresponding creep contact forces. The dynamic response of the system is obtained for different operational scenarios including ideal and imperfect tangent and curved tracks. Series-based functions are chosen to approximate the harmonic lateral track irregularities. Accelerations at carbody level, shift forces and wear number are used to evaluate the ride comfort, safety and wear, respectively. MATLAB genetic algorithm optimization routine is applied to perform the optimization. The Pareto sets and Pareto fronts obtained from this study provide the vectors of optimal design parameters corresponding to maximum admissible vehicle speed and guarantee the best tradeoff values for safety and comfort with threshold on wear for each operational scenario. Analysis of the obtained results gives insight into multiobjective optimized dynamic response of a railway vehicle and useful hints for designing adaptive bogie systems with the possibility to switch between optimal damping parameters value and provide the best operational efficiency.
Reports on the topic "Generic initial ideals"
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Warrick, Arthur W., Gideon Oron, Mary M. Poulton, Rony Wallach, and Alex Furman. Multi-Dimensional Infiltration and Distribution of Water of Different Qualities and Solutes Related Through Artificial Neural Networks. United States Department of Agriculture, January 2009. http://dx.doi.org/10.32747/2009.7695865.bard.
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The project exploits the use of Artificial Neural Networks (ANN) to describe infiltration, water, and solute distribution in the soil during irrigation. It provides a method of simulating water and solute movement in the subsurface which, in principle, is different and has some advantages over the more common approach of numerical modeling of flow and transport equations. The five objectives were (i) Numerically develop a database for the prediction of water and solute distribution for irrigation; (ii) Develop predictive models using ANN; (iii) Develop an experimental (laboratory) database of water distribution with time; within a transparent flow cell by high resolution CCD video camera; (iv) Conduct field studies to provide basic data for developing and testing the ANN; and (v) Investigate the inclusion of water quality [salinity and organic matter (OM)] in an ANN model used for predicting infiltration and subsurface water distribution. A major accomplishment was the successful use of Moment Analysis (MA) to characterize “plumes of water” applied by various types of irrigation (including drip and gravity sources). The general idea is to describe the subsurface water patterns statistically in terms of only a few (often 3) parameters which can then be predicted by the ANN. It was shown that ellipses (in two dimensions) or ellipsoids (in three dimensions) can be depicted about the center of the plume. Any fraction of water added can be related to a ‘‘probability’’ curve relating the size of the ellipse (or ellipsoid) that contains that amount of water. The initial test of an ANN to predict the moments (and hence the water plume) was with numerically generated data for infiltration from surface and subsurface drip line and point sources in three contrasting soils. The underlying dataset consisted of 1,684,500 vectors (5 soils×5 discharge rates×3 initial conditions×1,123 nodes×20 print times) where each vector had eleven elements consisting of initial water content, hydraulic properties of the soil, flow rate, time and space coordinates. The output is an estimate of subsurface water distribution for essentially any soil property, initial condition or flow rate from a drip source. Following the formal development of the ANN, we have prepared a “user-friendly” version in a spreadsheet environment (in “Excel”). The input data are selected from appropriate values and the output is instantaneous resulting in a picture of the resulting water plume. The MA has also proven valuable, on its own merit, in the description of the flow in soil under laboratory conditions for both wettable and repellant soils. This includes non-Darcian flow examples and redistribution and well as infiltration. Field experiments were conducted in different agricultural fields and various water qualities in Israel. The obtained results will be the basis for the further ANN models development. Regions of high repellence were identified primarily under the canopy of various orchard crops, including citrus and persimmons. Also, increasing OM in the applied water lead to greater repellency. Major scientific implications are that the ANN offers an alternative to conventional flow and transport modeling and that MA is a powerful technique for describing the subsurface water distributions for normal (wettable) and repellant soil. Implications of the field measurements point to the special role of OM in affecting wettability, both from the irrigation water and from soil accumulation below canopies. Implications for agriculture are that a modified approach for drip system design should be adopted for open area crops and orchards, and taking into account the OM components both in the soil and in the applied waters.
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Philosoph-Hadas, Sonia, Peter Kaufman, Shimon Meir, and Abraham Halevy. Signal Transduction Pathway of Hormonal Action in Control and Regulation of the Gravitropic Response of Cut Flowering Stems during Storage and Transport. United States Department of Agriculture, October 1999. http://dx.doi.org/10.32747/1999.7695838.bard.
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Original objectives: The basic goal of the present project was to increase our understanding of the cellular mechanisms operating during the gravitropic response of cut flowers, for solving their bending problem without affecting flower quality. Thus, several elements operating at the 3 levels o the gravity-induced signal transduction pathway, were proposed to be examined in snapdragon stems according to the following research goals: 1) Signaling: characterize the signal transduction pathway leading to the gravitropic response, regarding the involvement of [Ca2+]cyt as a mediator of IAA movement and sensitivity to auxin. 2) Transduction by plant hormones: a) Examine the involvement of auxin in the gravitropic response of flower stems with regard to: possible participation of auxin binding protein (ABP), auxin redistribution, auxin mechanism of action (activation of H+-ATPase) mediation by changes in [Ca2+]cyt and possible regulation of auxin-induced Ca2+ action b: calmodulin-activated or Ca2+-activated protein kinases (PK). b) Examine the involvement of ethylene in the gravitropic response of flower stems with regard to auxin-induced ethylene production and sensitivity of the tissue to ethylene. 3) Response: examine the effect of gravistimulation on invertase (associated with growth and elongation) activity and invertase gene expression. 4) Commercial practice: develop practical and simple treatments to prevent bending of cut flowers grown for export. Revisions: 1) Model systems: in addition to snapdragon (Antirrhinum majus L.), 3 other model shoe systems, consisting of oat (Avena sativa) pulvini, Ornithogalun 'Nova' cut flowers and Arabidopsis thaliana inflorescence, were targeted to confirm a more general mechanism for shoot gravitropism. 2 Research topics: the involvement of ABP, auxin action, PK and invertase in the gravitropic response of snapdragon stems could not be demonstrated. Alternatively, the involvement in the gravity signaling cascade of several other physiological mediators apart of [Ca2+]cyt such as: IP3, protein phosphorylation and actin cytoskeleton, was shown. Additional topics introduced: starch statolith reorientation, differential expression of early auxin responsive genes, and differential shoot growth. Background to the topic: The gravitropic bending response of flowering shoots occurring upon their horizontal placement during shipment exhibits a major horticultural problem. In spite of extensive studies in various aboveground organs, the gravitropic response was hardly investigated in flowering shoots. Being a complex multistep process that requires the participation of various cellular components acting in succession or in parallel, analysis of the negative gravitropic response of shoot includes investigation of signal transduction elements and various regulatory physiological mediators. Major achievements: 1) A correlative role for starch statoliths as gravireceptors in flowering shoot was initially established. 2) Differentially phosphorylated proteins and IP3 levels across the oat shoe pulvini, as well as a differential appearance of 2 early auxin-responsive genes in snapdragon stems were all detected within 5-30 minutes following gravistimulation. 3) Unlike in roots, involvement of actin cytoskeleton in early events of the gravitropic response of snapdragon shoots was established. 4) An asymmetric IAA distribution, followed by an asymmetric ethylene production across snapdragon stems was found following gravistimulation. 5) The gravity-induced differential growth in shoots of snapdragon was derived from initial shrinkage of the upper stem side and a subsequent elongation o the lower stem side. 6) Shoot bending could be successfully inhibited by Ca2+ antagonists (that serve as a basis for practical treatments), kinase and phosphatase inhibitors and actin-cytoskeleton modulators. All these agents did not affect vertical growth. The essential characterization of these key events and their sequence led us to the conclusion that blocking gravity perception may be the most powerful means to inhibit bending without hampering shoot and flower growth after harvest. Implications, scientific and agriculture: The innovative results of this project have provided some new insight in the basic understanding of gravitropism in flower stalks, that partially filled the gap in our knowledge, and established useful means for its control. Additionally, our analysis has advanced the understanding of important and fundamental physiological processes involved, thereby leading to new ideas for agriculture. Gravitropism has an important impact on agriculture, particularly for controlling the bending of various important agricultural products with economic value. So far, no safe control of the undesired bending problem of flower stalks has been established. Our results show for the first time that shoot bending of cut flowers can be inhibited without adverse effects by controlling the gravity perception step with Ca2+ antagonists and cytoskeleton modulators. Such a practical benefit resulting from this project is of great economic value for the floriculture industry.