Diversity in the Information Seeking Behaviour of the Virtual Scholar: Institutional Comparisons     

David Nicholas  Director of CIBER  Professor at  Director of the School of Library  Paul Huntington  Senior Researcher  a founder member of CIBER  SLAIS  University College London  WCE  BT  UK  Hamid R. Jamali  a researcher in CIBER  SLAIS  University College London  WCE  BT  UK 《The Journal of Academic Librarianship》2007,33(6):629-638

The logs of four universities using the OhioLINK journal system were evaluated for a period of fifteen months using deep log analysis methods in order to compare and contrast the information seeking behaviour of their users. Large differences were found, especially between the research and teaching universities. Methodological problems associated with making the comparisons are discussed in some detail especially in terms of defining online sessions.  相似文献   

Dimensions of variability in embedded operating systems     

Wolfgang Schr?der-Preikschat  Daniel Lohmann  Fabian Scheler  Olaf Spinczyk 《Informatik - Forschung und Entwicklung》2007,22(1):5-22

Design, implementation, and re-engineering of operating systems are still an ambitious undertaking. Despite, or even because, of the long history of theory and practice in this field, adapting existing systems to environments of different conditions and requirements as originally specified or assumed, in terms of functional and/or non-functional respects, is anything but simple. Especially this is true for the embedded systems domain which, on the one hand, calls for highly specialized and application-aware system abstractions and, on the other hand, cares a great deal for easily reusable implementations of these abstractions. The latter aspect becomes more and more important as embedded systems technology is faced with an innovation cycle decreasing in length. Software for embedded systems needs to be designed for variability, and this is in particular true for the operating systems of this domain. The paper discusses dimensions of variability that need to be considered in the development of embedded operating systems and presents approaches that aid construction and maintenance of evolutionary operating systems. CR subject classification  C.3; D.2.11; D.2.13; D.4.7  相似文献   

Information needs and uses: An analysis of the literature published in Spain, 1990–2004     

A. González-Teruel  M.F. Abad-García 《Library & information science research》2007

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Efficient reverse k-nearest neighbor estimation     

Elke Achtert  Christian B?hm  Peer Kr?ger  Peter Kunath  Alexey Pryakhin  Matthias Renz 《Informatik - Forschung und Entwicklung》2007,15(3):179-195

The reverse k-nearest neighbor (RkNN) problem, i.e. finding all objects in a data set the k-nearest neighbors of which include a specified query object, has received increasing attention recently. Many industrial and scientific applications call for solutions of the RkNN problem in arbitrary metric spaces where the data objects are not Euclidean and only a metric distance function is given for specifying object similarity. Usually, these applications need a solution for the generalized problem where the value of k is not known in advance and may change from query to query. In addition, many applications require a fast approximate answer of RkNN-queries. For these scenarios, it is important to generate a fast answer with high recall. In this paper, we propose the first approach for efficient approximative RkNN search in arbitrary metric spaces where the value of k is specified at query time. Our approach uses the advantages of existing metric index structures but proposes to use an approximation of the nearest-neighbor-distances in order to prune the search space. We show that our method scales significantly better than existing non-approximative approaches while producing an approximation of the true query result with a high recall.  相似文献   

Optimale Dimensionswahl bei der Bearbeitung des Similarity Join     

Christian B?hm  Hans-Peter Kriegel 《Informatik - Forschung und Entwicklung》2002,6(6):68-76

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Introduction to the Open File     

Jean-Jacques?DucretEmail author 《Prospects》2004,34(4):397-399

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The Effects of User-fee Policy on Attendance Rates among Kenyan Elementary Schoolchildren     

Edith?MukudiEmail author 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2004,50(5-6):447-461

What happens when a government cannot meet its obligation to provide universal primary education and enhance the quality of education for all of its citizens? The present study examines the interactions among stakeholders in the user-fee policy in primary education in Kenya. It seeks to show how this policy has affected attendance rates and drop-out rates among elementary schoolchildren. It reveals that, in addition to limiting access and contributing to attrition, user-fees significantly contribute to absenteeism. The study also exposes the dire situation of economically vulnerable citizens who do not have the resources which they need to ensure private education for their children. It concludes that together the government and household-level economic weaknesses have made it virtually impossible to attain the goal of education for all in Kenya.  相似文献   

Control volume analysis related to putt-putt boat     

Jaywant?H.?ArakeriEmail author 《Resonance》2004,9(6):92-95

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Schüleraktivitäten beim selbstorganisierten Lernen und deren Auswirkungen auf den Lernerfolg     

Jürgen?SeifriedEmail author 《Zeitschrift für Erziehungswissenschaft》2004,7(4):569-584

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Wiltrud Gieseke (Hrsg.): Handbuch der Frauenbildung     

Barbara?DrinckEmail author 《Zeitschrift für Erziehungswissenschaft》2004,7(3):454-456

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