Self-Directed Learning of the Basic Skills     

Dr. Mark A. Krabbe 《Clearing house (Menasha, Wis.)》2013,86(8):372-373

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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   

THE GENETIC ASPECTS OF HIGH INTELLIGENCE     

H. Drábková 《High Ability Studies》1991,1(2):191-196

A cohort of 71 pairs of twins was studied in a project which started within the decade 1965 to 1975. The total level of intelligence (global IQ) and the level of particular intellectual components have been examined annually since the twins were two years of age. The data were analysed by comparing monozygotic and dizygotic twins. The results revealed that high intelligence is influenced much more by hereditary than exogenous factors. Furthermore, there is an irregularity in the development of intellectual level from childhood to adulthood. Consequently, decision making about children cannot be carried out on the basis of a single IQ evaluation. A cluster analysis demonstrated the importance of hereditary factors not only on intellectual level, but also on the pattern of intellectual development.  相似文献   

Within Course Effects of a Training Package for Teachers of the Severely Mentally Handicapped     

Alan Jones  Dr  Colin Robson 《British Journal of Special Education》1983,10(2):17-20

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The center for executive development and my experiences     

Dr. Robert J. Masters 《Innovative Higher Education》1982,6(3):193-195

Since there is an increasing need for learning and relearning on the part of managers and executives, several business schools around the country have developed a program for offering seminars and workshops to the adult community for improving their level of supervisory, managerial, and executive performance. The purpose of this article is to lend assistance to those who are planning to embark upon this alternative higher education endeavor by sharing experiences from one institution.  相似文献   

Institutional financial assessment: Methodology and meaning     

Dr. Hans H. Jenny 《Research in higher education》1979,10(1):59-70

This paper responds to the fourth annual report by W. John Minter and Howard R. Bowen on Independent Higher EducationFinancial and Educational Trends in Independent Higher Education, 1978. Primary thesis: established financial reporting does not tend to do justice to a sound assessment of the financial condition of colleges and universities. Because the latter belong to the service economy, we must know more than we do about changes in quality. Such studies also must say how well institutional objectives are being achieved. College presidents and deans have tended to provide researchers with overly optimistic information. When they later see that Bowen and Minter report this very fact, they complain that their conclusions are not gloomy enough. Such double standards damage realistic program assessment efforts. The blame falls on the respondents and not on the authors. Neither can the authors be blamed for shortcomings in financial accounting ignoring the total cost of institutional activity. If accounting practice were based on a total cost concept the news about higher education finance would more nearly reflect what we all know is true: colleges and universities are worse off than the statistics say.Presented at the Annual Forum of the Association for Institutional Research, Houston, Texas, May 1978.  相似文献   

THE SWISS SYSTEM OF HIGHER EDUCATION     

Dr. Esther C. Garke 《Higher Education in Europe》1980,5(3):37-41

We have received numerous requests to present in “Higher Education in Europe”, in relatively short form, the main features of higher education systems in the different countries of the Unesco European Region.

As partial response to these requests, we present below a survey on the Swiss system of higher education, written for “Higher Education in Europe” by Dr. Esther C. Garke from the Swiss Federal Office for Education and Science, and CEPES Liaison Officer in Switzerland.

We also take this opportunity to invite our readers to provide us with papers or documents for similar presentations.  相似文献   

The Co-Effects of Query Structure and Expansion on Retrieval Performance in Probabilistic Text Retrieval     

Jaana Kekäläinen  Kalervo Järvelin 《Information Retrieval》2000,1(4):329-344

The effects of query structures and query expansion (QE) on retrieval performance were tested with a best match retrieval system (InQuery¹). Query structure means the use of operators to express the relations between search keys. Six different structures were tested, representing strong structures (e.g., queries with facets or concepts identified) and weak structures (no concepts identified, a query is a bag of search keys). QE was based on concepts, which were first selected from a searching thesaurus, and then expanded by semantic relationships given in the thesaurus. The expansion levels were (a) no expansion, (b) a synonym expansion, (c) a narrower concept expansion, (d) an associative concept expansion, and (e) a cumulative expansion of all other expansions. With weak structures and Boolean structured queries, QE was not very effective. The best performance was achieved with a combination of a facet structure, where search keys within a facet were treated as instances of one search key (the SYN operator), and the largest expansion.  相似文献   

Exploring the link between culture and strategy in media organisations: The cases of the BBC and CNN     

Dr. Lucy Küng 《媒体管理杂志》2013,15(2):100-109

Abstract

This study employs participant observation methodology to examine the U.S. broadcast industry's cognitions of its external environment. Previous research has documented a tendency among industry participants to operate under outdated mental models of their environment. This tendency ‐ labeled ‘cognitive inertia’ ‐ provides the analytical framework for this study. The results provide indications that broadcasters operate under what appear to be outdated mental models of their external environment, with broadcasters appearing to pay inadequate attention to competing program sources and failing to account for the changing demographic composition of the television audience. However, these conclusions are tempered by the broadcast industry's dual‐product marketplace characteristics, wherein cognitions that would appear to reflect inadequate assessment of the content market may in fact reasonably reflect the contemporary realities of the audience market.  相似文献   

Community environment studies programme     

Dr Richard Myshak 《Prospects》1972,2(4):457-463

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