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Search Results: 1 - 10 of 1314 matches for " Wallace Koehler "
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Digital libraries and World Wide Web sites and page persistence.
Wallace Koehler
Information Research: an international electronic journal , 1999,
Abstract: Web pages and Web sites, some argue, can either be collected as elements of digital or hybrid libraries, or, as others would have it, the WWW is itself a library. We begin with the assumption that Web pages and Web sites can be collected and categorized. The paper explores the proposition that the WWW constitutes a library. We conclude that the Web is not a digital library. However, its component parts can be aggregated and included as parts of digital library collections. These, in turn, can be incorporated into "hybrid libraries." These are libraries with both traditional and digital collections. Material on the Web can be organized and managed. Native documents can be collected in situ, disseminated, distributed, catalogueed, indexed, controlled, in traditional library fashion. The Web therefore is not a library, but material for library collections is selected from the Web. That said, the Web and its component parts are dynamic. Web documents undergo two kinds of change. The first type, the type addressed in this paper, is "persistence" or the existence or disappearance of Web pages and sites, or in a word the lifecycle of Web documents. "Intermittence" is a variant of persistence, and is defined as the disappearance but reappearance of Web documents. At any given time, about five percent of Web pages are intermittent, which is to say they are gone but will return. Over time a Web collection erodes. Based on a 120-week longitudinal study of a sample of Web documents, it appears that the half-life of a Web page is somewhat less than two years and the half-life of a Web site is somewhat more than two years. That is to say, an unweeded Web document collection created two years ago would contain the same number of URLs, but only half of those URLs point to content. The second type of change Web documents experience is change in Web page or Web site content. Again based on the Web document samples, very nearly all Web pages and sites undergo some form of content within the period of a year. Some change content very rapidly while others do so infrequently (Koehler, 1999a). This paper examines how Web documents can be efficiently and effectively incorporated into library collections. This paper focuses on Web document lifecycles: persistence, attrition, and intermittence. While the frequency of content change has been reported (Koehler, 1999a), the degree to which those changes effect meaning and therefore the integrity of bibliographic representation is yet not fully understood. The dynamics of change sets Web libraries apart from the traditional library
A bibliometric analysis of select information science print and electronic journals in the 1990s
Wallace Koehler
Information Research: an international electronic journal , 2000,
Abstract: This paper examines three e-journals and one paper journal begun in the 1990s within the information science genre. In addition, these journals are compared to what is perhaps the leading information science journal,one that has been published continuously for fifty years. The journals we examine are CyberMetrics, Information Research, the Journal of Internet Cataloging, Libres, and the Journal of the American Society for Information Science. We find that there are a number of important differences among the journals. These include frequency of publication, publication size, number of authors, and the funding status of articles. We also find differences among journals for distributions of authors by gender and corporate authors by region. Some of the regional differences can be explained by journal maturation -- the more mature the journal the greater the dispersion. We also find that women are more likely to publish in the newer journals than in JASIS. The fact that a journal is or is not an e-journal does not appear to affect its presence or "behaviour" as an information science journal.
A longitudinal study of Web pages continued: a consideration of document persistence. Web documents, Half-life, Linkrot, Persistence, Web citations
Wallace Koehler
Information Research: an international electronic journal , 2004,
Abstract: It is well established that Web documents are ephemeral in nature. The literature now suggests that some Web objects are more ephemeral than others. Some authors describe this in terms of a Web document half-life, others use terms like 'linkrot' or persistence. It may be that certain 'classes' of Web documents are more or less likely to persist than are others. This article is based upon an evaluation of the existing literature as well as a continuing study of a set of URLs first identified in late 1996. It finds that a static collection of general Web pages tends to 'stabilize' somewhat after it has 'aged'. However 'stable' various collections may be, their instability nevertheless pose problems for various classes of users. Based on the literature, it also finds that the stability of more specialized Web document collections (legal, educational, scientific citations) vary according to specialization. This finding, in turn, may have implications both for those who employ Web citations and for those involved in Web document collection development.
Intellectual property rights vs. public access rights: ethical aspects of the DeCSS decryptation program
Robert Vaagan,Wallace Koehler
Information Research: an international electronic journal , 2005,
Abstract: Introduction. In 1999-2000, a Norwegian youth cracked a DVD-access code and published a decryptation program on the Internet. He was sued by the US DVD Copy Control Association (DVD-CCA) and the Norwegian Motion Picture Association (MAP), allies of the US Motion Picture Association of America (MPAA), arrested by Norwegian police and charged with data crime. Two Norwegian court rulings in 2003 unanimously ruled that the program did not amount to a breach of Norwegian law, and he was fully acquitted. In the US, there have been related cases, some with other outcomes. Method. Based on a theoretical framework developed by Zwass, the paper discusses these court rulings and the wider issues of intellectual property rights versus public access rights. Analysis. The DVD-Jon case illustrates that intellectual property rights can conflict with public access rights, as the struggle between proprietary software and public domain software, as well as the SPARC and Open Archives Initiative reflect. Results. An assessment of the DVD-Jon case based on the Zwass framework does not give a clear information ethics answer. The analysis depends on whether one ascribes to consequentialist (e.g., utilitarian) or de-ontological reflection, and also on which side of the digital gap is to be accorded most weight. Conclusion. While copyright interests are being legally strengthened, there may be ethically- grounded access rights that outweigh property rights.
Digital Libraries and World Wide Web Sites and Page Persistence
数字化图书馆和WWW站点及其页面的持续性

Wallace Koehler,
Wallace
,Koeh,ler,[著],张莹[译]

现代图书情报技术 , 2000,
Abstract: Web pages and Web sites, some argue, can either be collected as elements of digital or hybrid libraries, or, as other would have it, the WWW is itself a library. We begin with the assumption that Web pages and Web sites can be collected and categorized. The paper explores the proposition that the WWW constitutes a library. We conclude that the Web is not a digital library. However, its component parts can be aggregated and included as parts of digital library collections. These, in turn, can be incorporated into“hybrid, libraries. ”These are libraries with both traditional and digital collections.Material on the Web can be organized and managed, Native documents can be collected in situ, disseminated, distributed,catalogueed, indexes, controlled, in traditional library fashion. The Web therefore is not a library, but material for library collections is selected from the Web. That said, the Web and its component parts are dynamic. Web documents undergo two kinds of change. The first type, the type addressed in this paper, is“persistence”or the existence or disappearance of Web pages and sites, or in a word the lifecycle of Web documents. “Intermittence”is a variant of persistence, and is defined as the disappearance but reappearance of Web documents. At any given time, about five percent of Web pages are intemittent,which is to say they are gone but will return, Over time a Web collection erodes. Based on a 120- week longitudinal study of a sample of Web documents, it appears that the half- life of a Web page is somewhat less than two years and the half- life of a Web site is somewhat more than two years. That is to say, an unweeded Web document collection created two years ago would contain the same number of URL s, but only half of those URLs point to content. The second type of change Web documents experience is change in Web page or Web site content. A gain based on the Web document samples, very nearly all Web pages and sites undergo some form of content with in the period of a year. Some change content very rapidly while others do so infrequently (Koehler, l999a). This paper examines how Web documents can be efficiently and effectively incorporated into library collections. This paper focuses on Web document lifecycles: persistence, attrition, and interm it tence, while the frequency of content change has been reported (Koehler, 1999a) , the degree to which those changes effect meaning and therefore the integrity of bibliographic representation is yet not fully undersatood. The dynamics of change sets Web libraries apart from the traditional library as well as many digital libraries. This paper seeks then to further our understanding of the Web page and Web site lifecycle. These patterns challenge the integrity and the usefulness of libraries with Web content. However, if these dynam ics are understood, they can be controlled for or managed.
O Grande Sert o e a Literatura e o Subdesenvolvimento
Jaqueline Koehler
Revista Trías , 2012,
Abstract: Este artigo analisa o romance Grande sert o: veredas a partir da leitura do texto “Literatura e Subdesenvolvimento” de Antonio Candido. Procurando repensar o romance roseano como um retrato do país, porém sem a presen a de uma vis o historicamente presente nas literaturas latinas, da natureza como elemento romantico, mas com uma “cor local” que tem como fun o trazer um olhar crítico a respeito da realidade do país. Um exemplo discutido é o de Riobaldo, que ascende socialmente através da educa o e, com isso, reflete em toda sua narrativa a respeito da condi o social brasileira.
The Black Belt Librarian: Real-World Safety & Security (Book Review)
Abby Koehler
Journal of Library Innovation , 2012,
Abstract: A review of Warren Graham's updated The Black Belt Librarian: Real-World Safety & Security.
European Foreign Policy After Lisbon: Strengthening the EU as an International Actor
Kateryna Koehler
Caucasian Review of International Affairs , 2010,
Abstract: Following years of compromise, the Treaty of Lisbon finally came into force on December 1, 2009. This article analyses the new substantive law regulations and institutional arrangements of the Lisbon Treaty in the field of external relations and their impact on the effectiveness of the European foreign policy and the European Union as an international actor. For this purpose, this paper starts with analyses of the principle of coherence and continues with the reformed structure and legal personality of the EU, which was previously a serious challenge for the coherence of the EU’s foreign policy. Finally, this article examines the functions and implications of institutional innovations, namely, the positions of the High Representative of the Union for Foreign Affairs and Security Policy, the President of the European Council and the European External Action Service. This paper argues that the Treaty of Lisbon improves the preconditions for a higher degree of coherence in European external relations and strengthens the EU as an international actor, even if the success of the European foreign policy, especially in the field of CFSP, still depends to a great extent on the Member States’ willingness to cooperate.
Matrix Representation of Special Relativity
Wolfgang Koehler
Physics , 2007,
Abstract: I compare the matrix representation of the basic statements of Special Relativity with the conventional vector space representation. It is shown, that the matrix form reproduces all equations in a very concise and elegant form, namely: Maxwell equations, Lorentz-force, energy-momentum tensor, Dirac-equation and Lagrangians. The main thesis is, however, that both forms are nevertheless not equivalent, but matrix representation is superior and gives a deeper insight into physical reality, because it is based on much less assumptions. It allows a better understanding of Minkowski spacetime on the basis of matrix algebra. An escpecially remarkable result of the consequent usage of this alge- braic concept is the formulation of Diracs equation in a novel matrix form. This equation can be generalized to include a new variant of Yang-Mills gauge fields, which possibly express unified electro-weak interactions in a new way.
Quantum jumps in hydrogen-like systems
Thorsten Koehler
Physics , 1996, DOI: 10.1103/PhysRevA.54.4553
Abstract: In this paper it is shown that the Lyman-$\alpha$ transition of a single hydrogen-like system driven by a laser exhibits macroscopic dark periods, provided there exists an additional constant electric field. We describe the photon-counting process under the condition that the polarization of the laser coincides with the direction of the constant electric field. The theoretical results are given for the example of $^4{He}^+$. We show that the emission behavior depends sensitively on the Lamb shift (W.E. Lamb, R.C. Retherford, Phys. Rev. 72, 241 (1947)) between the $2s_{1/2}$ and $2p_{1/2}$ energy levels. A possibly realizable measurement of the mean duration of the dark periods should give quantitative information about the above energy difference by using the proposed photon-counting process.
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