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17 results on '"NTK"'

1. Metric flows with neural networks

Author

James Halverson and Fabian Ruehle

Subjects
metric, flows, NTK, Calabi–Yau, Computer engineering. Computer hardware, TK7885-7895, Electronic computers. Computer science, QA75.5-76.95
Abstract

We develop a general theory of flows in the space of Riemannian metrics induced by neural network (NN) gradient descent. This is motivated in part by recent advances in approximating Calabi–Yau metrics with NNs and is enabled by recent advances in understanding flows in the space of NNs. We derive the corresponding metric flow equations, which are governed by a metric neural tangent kernel (NTK), a complicated, non-local object that evolves in time. However, many architectures admit an infinite-width limit in which the kernel becomes fixed and the dynamics simplify. Additional assumptions can induce locality in the flow, which allows for the realization of Perelman’s formulation of Ricci flow that was used to resolve the 3d Poincaré conjecture. We demonstrate that such fixed kernel regimes lead to poor learning of numerical Calabi–Yau metrics, as is expected since the associated NNs do not learn features. Conversely, we demonstrate that well-learned numerical metrics at finite-width exhibit an evolving metric-NTK, associated with feature learning. Our theory of NN metric flows therefore explains why NNs are better at learning Calabi–Yau metrics than fixed kernel methods, such as the Ricci flow.

Published
2024
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3. North Sea know-how in the New World: Building offshore windfarms in America

Author

Cavaleri, Sylvie Cécile, Durham, William Henry, Cavaleri, Sylvie Cécile, and Durham, William Henry

Abstract

The first offshore wind site, Vindeby, was commissioned in Denmark in 1991. The nascent industry expanded rapidly in the North Sea due to the strong wind resource there, government support through subsidies, and existing expertise and supply chains from the oil and gas industry that had thrived in the area since the 1970s. The North Sea has been a testing ground and a worldwide leader in the creation and improvement of technologies, supply chains, and know-how on all aspects of developing offshore wind sites. Now, there are over forty offshore wind farms commissioned in the North Sea, around 75% of the worldwide installed capacity. North Sea countries house many of the major developers of offshore wind projects and the major suppliers of turbines, cables, and offshore electrical works. The signing of the Paris Agreement in 2018 marks a greater worldwide commitment to reducing climate gas emission and reliance on fossil fuels. An essential part of the green transition will include the growth of renewable energy, including offshore wind. New markets for offshore wind are emerging around the world that will rely on the experience and suppliers from the North Sea. The industry is on the cusp of exponential growth, as technological capacity and public support converge. This thesis looks at the emerging offshore wind market in the United States and focuses on how the practices from the North Sea in contracting offshore wind construction can be imported and adapted into the American environment. The thesis looks at contracting standards and norms used in the North Sea and their applicability to the US, specifically focusing on limitations of tort and contract liability in the form of liability caps and consequential damage waivers, performance warranties specific to turbine supply, knock-for-knock indemnities, and US cabotage laws (the Jones Act) relating to the supply of vessels. The thesis offers practical advice and best practices in drafting certain c

Published
2022

4. Practical Role-Based Access Control.

Author

Galante, Victoria

Subjects
*ACCESS control, *COMPUTER network security, *FILTERING software, *SURROGATE-based optimization, *COMPUTER systems
Abstract

This article presents access control from a general and a role-based perspective. The article's focus is role based Access Control from a practical vice a theoretical perspective. The article starts with some access control definitions and two secure access control models. Access control is then presented in context of an abstract model, as preface to an in-depth assessment of Role Based Access Control (RBAC). Several examples contrast RBAC and the simple access control model. The article does not portray RBAC as a panacea, optimal for all situations. Indeed, it is feely admitted that RBAC may be counterproductive in some instances. But the point is also made that RBAC, when properly implemented in an appropriate environment, can reward the organization with economic, security and accountability benefits. Surrogacy is discussed as an essential RBAC attribute and, in practical terms, as a means of drastically reducing authorization volume. Lastly, the article touches on converting from simpler forms of access control to the more complex RBAC. [ABSTRACT FROM AUTHOR]

Published
2009
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8. eBooks in NTL 2013

Author

Kolátor, Jan

Subjects
e-knihy, Ebrary, Kramerius, digitální knihovny, eknihy, NTK, NTL, digital libraries, e-books, eBooks
Abstract

Summary of ebooks progress in National Technical Library in the year 2013.

Published
2013

10. Immaterielle rettigheter i subsea produksjonssystem Fordeling av slike rettigheter etter NTK 07, kapittel X

Author

Ingebo, John Anders

Subjects
immaterialrett, rettigheter, NTK, subsea
Abstract

Ser på ulike problemstillinger i forbindelse med fordeling av immaterielle rettigheter i store " subsea" systemleveranser mellom profesjonelle parter. Hovedleverandør på den ene siden og selskapet på den andre. Oppgaven tar for seg fordeling av slike rettigheter og selskapets bruksrett. Kontrakten er NTK.

Published
2013

13. Grey Literature in the Czech Republic

Author

Pejsova, Petra (NTK), Pfeiferova, Martina (NTK), GreyNet, Grey Literature Network Service, and GL10, Amsterdam (The Netherlands), 2008-12-8

Subjects
Metadata, 05B - Information science, librarianship, NRGL, NTK, Czech Republic
Abstract

Our contribution summarizes and describes activities concerning grey literature in the Czech Republic. The managing organisation of the activity is the State Technical Library (henceforth the STL); in the past, it was the STL, who was collecting, publishing and submitting grey literature into the SIGLE system. Moreover, the STL was the representative of the Czech Republic in the EAGLE. Now, EAGLE being extinct, there is no coordinated collection of grey literature on the national level since 2005. The STL makes up the role of the Czech National Library, which under the National Digital Library project, aims at accessibility of wide spread published documents ("white literature"). On the other hand, the STL intends to deal with literature not acquired through normal bookselling channels (grey literature) and initiated a project for grey literature retrieval. The project - National Repository of Grey Literature (henceforth NRGL) - has been supported by the Ministry of Culture. Its main objective is formation of a digital repository of grey literature in the Czech Republic. The project aims at gathering metadata and possibly full texts of grey documents in the field of education, science and research. NRGL shall solve the typology of documents gathered, metadata formats, persistent identifiers, intellectual property issues, soft- and hardware support, forming a network of collaborating institutions etc. There has been established a close collaboration with representatives of Czech universities, who face the issue of storing university qualification theses which is one of the segments of typology of documents collected by NRGL. The National Registry of University Qualification Theses shall become a component of NRGL. The STL has also got in touch with further issuers of grey literature in the Czech Republic, in particular research institutes of the Czech Academy of Sciences, the institution covering a major part of production of grey literature in the segment of research and development. NRGL should make it possible to research the data on grey literature in the Czech Republic at one spot with a single interface, as well as to retrieve the information on the owner of the document and if possible, the full text of the document, either in electronic form or through the contemporary network of libraries (interlibrary loan, Virtual Polytechnic Library, Document Delivery Service etc.). The NRGL project does not assume retrospective digitalisation of grey literature documents. However, we intend to make NRLG be a trustworthy repository. The aim of the project is to provide services not to the NRGL contributors only, but also to the widest public. The STL has based the project on practice of universities which had already experience with local repositories. The entire NRGL project is consulted with the National Library of the Czech Republic as a part of the National Digital Library project. Includes: Conference preprint, Powerpoint presentation, Abstract and Biographical notes XA International

Published
2008

14. Retrospective cataloguing LCCS

Author

Římanová, Radka

Subjects
PSH, NTL, věcný popis, National Technical Library, Polytematický strukturovaný heslář, NTK, LCC, klasifikace, Library of Congress Classification, Polythematic Structured Subject Headings System, retrospective cataloguing, retrospektivní katalogizace, Národní technická knihovna
Published
2008

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