The Experts below are selected from a list of 25404 Experts worldwide ranked by ideXlab platform
Michael L Nelson - One of the best experts on this subject based on the ideXlab platform.
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Web archive profiling through CDX summarization
International Journal on Digital Libraries, 2016Co-Authors: Sawood Alam, Herbert Van De Sompel, Michael L Nelson, Lyudmila L. Balakireva, Harihar Shankar, David S. H. RosenthalAbstract:With the proliferation of public web archives, it is becoming more important to better profile their contents, both to understand their immense holdings as well as to support routing of requests in the Memento aggregator. To save time, the Memento aggregator should only poll the archives that are likely to have a copy of the requested URI. Using the crawler index files produced after crawling, we can generate profiles of the archives that summarize their holdings and can be used to inform routing of the Memento aggregator’s URI requests. Previous work in profiling ranged from using full Uris (no false positives, but with large profiles) to using only top-level domains (TLDs) (smaller profiles, but with many false positives). This work explores strategies in between these two extremes. In our experiments, we correctly identified about 78 % of the Uris that were present or not present in the archive with less than 1 % relative cost as compared to the complete knowledge profile and 94 % Uris with less than 10 % relative cost without any false negatives. With respect to the TLD-only profile, the registered domain profile doubled the routing precision, while complete hostname and one path segment gave a tenfold increase in the routing precision.
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persistent annotations deserve new Uris
ACM IEEE Joint Conference on Digital Libraries, 2011Co-Authors: Abdulla Alasaadi, Michael L NelsonAbstract:Some digital libraries support annotations, but sharing these annotations with other systems or across the web is difficult because of the need of special applications to read and decode these annotations. Due to the frequent change of web resources, the annotation's meaning can change if the underlying resources change. This project concentrates on minting a new URI for every annotation and creating a persistent and independent archived version of all resources. Users should be able to select a segment of an image or a video to be part of the annotation. The media fragment Uris described in the Open Annotation Collaboration data model can be used, but in practice they have limits, and they face the lack of support by the browsers. So in this project the segments of images, and videos can be used in the annotations without using media fragment Uris.
Rik Van De Walle - One of the best experts on this subject based on the ideXlab platform.
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http adaptive streaming with media fragment Uris
International Conference on Multimedia and Expo, 2011Co-Authors: Wim Van Lancker, Davy Van Deursen, Erik Mannens, Rik Van De WalleAbstract:HTTP adaptive streaming was introduced with the general idea that user agents interpret a manifest file (describing different representations and segments of the media); where-after they retrieve the media content using sequential HTTP progressive download operations. MPEG started with the standardization of an HTTP streaming protocol, defining the structure and semantics of a manifest file and additional restrictions and extensions for container formats. At the same time, W3C is working on a specification for addressing media fragments on the Web using Uniform Resource Identifiers. The latter not only defines the URI syntax for media fragment identifiers but also the protocol for retrieving media fragments over HTTP. In this paper, we elaborate on the role of Media Fragment Uris within HTTP adaptive streaming scenarios. First, we elaborate on how different media representations can be addressed by means of Media Fragment Uris, by using track fragments. Additionally, we illustrate how HTTP adaptive streaming is realized relying on the Media Fragments URI retrieval protocol. To validate the presented ideas, we implemented Apple's HTTP Live streaming technique using Media Fragment Uris.
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ICME - HTTP adaptive streaming with Media Fragment Uris
2011 IEEE International Conference on Multimedia and Expo, 2011Co-Authors: Wim Van Lancker, Davy Van Deursen, Erik Mannens, Rik Van De WalleAbstract:HTTP adaptive streaming was introduced with the general idea that user agents interpret a manifest file (describing different representations and segments of the media); where-after they retrieve the media content using sequential HTTP progressive download operations. MPEG started with the standardization of an HTTP streaming protocol, defining the structure and semantics of a manifest file and additional restrictions and extensions for container formats. At the same time, W3C is working on a specification for addressing media fragments on the Web using Uniform Resource Identifiers. The latter not only defines the URI syntax for media fragment identifiers but also the protocol for retrieving media fragments over HTTP. In this paper, we elaborate on the role of Media Fragment Uris within HTTP adaptive streaming scenarios. First, we elaborate on how different media representations can be addressed by means of Media Fragment Uris, by using track fragments. Additionally, we illustrate how HTTP adaptive streaming is realized relying on the Media Fragments URI retrieval protocol. To validate the presented ideas, we implemented Apple's HTTP Live streaming technique using Media Fragment Uris.
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WWW - Implementing the media fragments URI specification
Proceedings of the 19th international conference on World wide web - WWW '10, 2010Co-Authors: Davy Van Deursen, Erik Mannens, Raphaël Troncy, Silvia Pfeiffer, Yves Lafon, Rik Van De WalleAbstract:In this paper, we describe two examples of implementations of the Media Fragments URI specification which is currently being developed by the W3C Media Fragments Working Group. The group's mission is to create standard addressing schemes for media fragments on the Web using Uniform Resource Identifiers (Uris). We describe two scenarios to illustrate the implementations. More specifically, we show how User Agents (UA) will either be able to resolve media fragment Uris without help from the server, or will make use of a media fragments-aware server. Finally, we present some ongoing discussions and issues regarding the implementation of the Media Fragments specification.
David S. H. Rosenthal - One of the best experts on this subject based on the ideXlab platform.
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Web archive profiling through CDX summarization
International Journal on Digital Libraries, 2016Co-Authors: Sawood Alam, Herbert Van De Sompel, Michael L Nelson, Lyudmila L. Balakireva, Harihar Shankar, David S. H. RosenthalAbstract:With the proliferation of public web archives, it is becoming more important to better profile their contents, both to understand their immense holdings as well as to support routing of requests in the Memento aggregator. To save time, the Memento aggregator should only poll the archives that are likely to have a copy of the requested URI. Using the crawler index files produced after crawling, we can generate profiles of the archives that summarize their holdings and can be used to inform routing of the Memento aggregator’s URI requests. Previous work in profiling ranged from using full Uris (no false positives, but with large profiles) to using only top-level domains (TLDs) (smaller profiles, but with many false positives). This work explores strategies in between these two extremes. In our experiments, we correctly identified about 78 % of the Uris that were present or not present in the archive with less than 1 % relative cost as compared to the complete knowledge profile and 94 % Uris with less than 10 % relative cost without any false negatives. With respect to the TLD-only profile, the registered domain profile doubled the routing precision, while complete hostname and one path segment gave a tenfold increase in the routing precision.
Key-sun Choi - One of the best experts on this subject based on the ideXlab platform.
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International Semantic Web Conference (2) - I18n of semantic web applications
Lecture Notes in Computer Science, 2010Co-Authors: Sören Auer, Matthias Weidl, Jens Lehmann, Amrapali Zaveri, Key-sun ChoiAbstract:Recently, the use of semantic technologies has gained quite some traction. With increased use of these technologies, their maturation not only in terms of performance, robustness but also with regard to support of non-latin-based languages and regional differences is of paramount importance. In this paper, we provide a comprehensive review of the current state of the internationalization (I18n) of Semantic Web technologies. Since resource identifiers play a crucial role for the Semantic Web, the internatinalization of resource identifiers is of high importance. It turns out that the prevalent resource identification mechanism on the Semantic Web, i.e. Uris, are not sufficient for an efficient internationalization of knowledge bases. Fortunately, with IRIs a standard for international resource identifiers is available, but its support needs much more penetration and homogenization in various semantic web technology stacks. In addition, we review various RDF serializations with regard to their support for internationalized knowledge bases. The paper also contains an in-depth review of popular semantic web tools and APIs with regard to their support for internationalization.
Yue Pan - One of the best experts on this subject based on the ideXlab platform.
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making Uris published on data web rdf dereferencable
International Semantic Web Conference, 2008Co-Authors: Jing Mei, Shengping Liu, Guotong Xie, Yue PanAbstract:Nowadays, more and more Uris reside on DataWeb, as published for linked open data, dereferencing Uris challenges the current Web to embrace Semantic Web. Although, quite a few practical recipes for publishing Uris have been provided to make Uris dereferencable, we believe a fundamental investigation of publishing and dereferencing Uris would contribute a forward compatibility with the RDF and OWL upper layers in the Semantic Web architecture. In this paper, we propose to make Uris published on Data Web RDF dereferencable, and we formalize such a requirement in an RDF-compatible semantics. Also, the dereferencing operation is defined in an abstract URI syntax, such that Uris, as interpreted as described resources, would be RDF dereferencable by default. Accompanied by a live demonstration, the poster demo explanation would elaborately discuss and seriously address issues on Data Web Uris, which were or have been taken for granted. Additionally, for case study, Metadata Web, a Data Web of enterprise-wide models, is explored. The Uris on Metadata Web is published as RDF dereferencable. Such an implementation of universal metadata management across the enterprise enables the metadata federation such that global query, search and analysis could be conducted on top of the Metadata Web.
