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Kadriye Ercikan Rubab Arim Danielle Law Jose Domene France Gagnon Serge Lacroix 《Educational Measurement》2010,29(2):24-35
This paper demonstrates and discusses the use of think aloud protocols (TAPs) as an approach for examining and confirming sources of differential item functioning (DIF). The TAPs are used to investigate to what extent surface characteristics of the items that are identified by expert reviews as sources of DIF are supported by empirical evidence from examinee thinking processes in the English and French versions of a Canadian national assessment. In this research, the TAPs confirmed sources of DIF identified by expert reviews for 10 out of 20 DIF items. The moderate agreement between TAPs and expert reviews indicates that evidence from expert reviews cannot be considered sufficient in deciding whether DIF items are biased and such judgments need to include evidence from examinee thinking processes. 相似文献
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In March 1985, the National Library of Medicine (NLM) began implementation of DOCLINE, its automated interlibrary loan request routing and referral system. By the end of fiscal year (FY) 1987, over 1,400 biomedical libraries in all seven regions of the Regional Medical Library network were using the system. This report summarizes the findings of an analysis of the interlibrary loan (ILL) requests received in FY 1987, comparing the results with a similar analysis done in FY 1984 to describe any changes in the requests or service which might be attributable to DOCLINE implementation. DOCLINE has had a substantial impact upon ILL loan service at NLM. An increase in the number of ILL requests (35% over FY 1984) can be attributed to the speed and ease with which requests may be routed to NLM through DOCLINE. Requests which cannot be filled by local or regional libraries are automatically routed by the system to NLM as the library of last resort. NLM's fill rate for serial requests has declined, however, from 78% filled in FY 1984 to 67% filled in FY 1987. Some of the decline results from the 11,000 requests that NLM did not fill because the borrowing libraries were not willing to pay the NLM charge for filling the loans. 相似文献
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Helena P. Osana Guy L. Lacroix Bradley J. Tucker Chantal Desrosiers 《Journal of Mathematics Teacher Education》2006,9(4):347-380
The objective of this study was to examine the nature of preservice teachers’ evaluations of elementary mathematics problems using the Mathematical Tasks Framework (MTF), a model designed to discriminate among tasks according to their cognitive complexity. We also tested the relationship between mathematics content knowledge and problem length on the preservice teachers’ evaluations. Twenty-six undergraduate students enrolled in an elementary mathematics methods course at a large urban university were introduced to the MTF and cognitive complexity during a class lecture and were subsequently required to sort 32 mathematics problems according to the framework. Results demonstrated that overall, the preservice teachers had more difficulty accurately classifying problems considered to represent high levels of cognitive complexity compared to problems that were less complex. Those with strong mathematics content knowledge, as measured by a standardized test, were able to sort the problems more accurately than those with weaker content knowledge. Two open-ended items assessing content knowledge were not related to sorting performance. Finally, the preservice teachers were influenced by the surface characteristic of task length; the data indicated that the teachers tended to label short problems as less cognitively demanding and long problems as more so. Implications for preservice professional development include an increased emphasis on mathematics content knowledge as well as expert modeling of the identification of deep conceptual principles at the heart of the mathematics curriculum. 相似文献
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Bravo's hit series Queer Eye for the Straight Guy has garnered much popular and critical acclaim. While from a Queer theory perspective, Queer Eye's openly gay stars and their easy fraternization with straight men can be celebrated, there are reasons for critical concern. In interrogating the series as an expression of the strategic rhetoric of heteronormativity, we examine how Queer Eye functions as a mediated ritual of rebellion that domesticates Queers, contains Queer sexuality, and places straight men at the sociosexual center. The series thus supports the very heteronormative order it seems to challenge. 相似文献
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MEDLINEplus: building and maintaining the National Library of Medicine's consumer health Web service 总被引：1，自引：0，他引：1
MEDLINEplus is a Web-based consumer health information resource, made available by the National Library of Medicine (NLM). MEDLINEplus has been designed to provide consumers with a well-organized, selective Web site facilitating access to reliable full-text health information. In addition to full-text resources, MEDLINEplus directs consumers to dictionaries, organizations, directories, libraries, and clearinghouses for answers to health questions. For each health topic, MEDLINEplus includes a preformulated MEDLINE search created by librarians. The site has been designed to match consumer language to medical terminology. NLM has used advances in database and Web technologies to build and maintain MEDLINEplus, allowing health sciences librarians to contribute remotely to the resource. This article describes the development and implementation of MEDLINEplus, its supporting technology, and plans for future development. 相似文献
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The purpose of this article is to show how costs and benefits of geographical decentralization of R&D can be identified and compared. The benefits for the region that receives R&D activities are studied in section 2. They stem from the short-run multiplier effect, the amelioration of human capital and the possible modernization of the local industrial structure. On the cost side examined in section 3, the observable impacts of the decentralization of R&D concern the loss of returns to scale and urban economies of the production of the R&D output. It is shown, in section 4, that the flows of costs and benefits must be discounted by the social cost of capital. The main conclusion of this article is that the decentralization of R&D in a large, sparsely populated country entails social costs and this would weaken its competitive position in world commerce. On the other hand, the issue of decentralization is more crucial for small countries (in terms of population and economic size) than for large ones, like the U.S., where critical masses of research efforts can be simultaneously attained in many fields and in many places. 相似文献
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Natasha Lacroix 《Instructional Science》1999,27(3-4):221-233
This paper addresses the issue of macrostructural processing of multiple text passages. Two levels of macrostructural processing, macrostructural construction (extracting important information) and organization (structuring selected information) may be at work during complex text comprehension. Three experiments examined the effects of various textual and situational factors on macrostructural construction and organization. College students were asked to read small sets of documents presented in hypertext format. The students' reading strategies as well as their written reports were analyzed. Experiment 1 showed that headings and presentation format influence macrostructural organization. Experiment 2 showed that task requirements tend to influence macrostructure construction and organization, whereas presentation conditions, such as the marking of important information and the presentation order, can affect both levels of macrostructural processing. Finally, experiment 3 indicated that there is an interaction between global and local headings and the construction and organization of macrostructure. The three experiments also suggested that subjects can be characterized based on how well they deal with macrostructural construction and organization. It is concluded that the comprehension of hypertext involves higher levels of cognitive processing which ensure the structuring of multiple text information. 相似文献
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In 1962, an analysis of interlibrary loan requests for serials filled by NLM in 1959 was published. In the twenty-five years following 1959, important changes occurred in the biomedical library community, which had a significant impact on interlibrary loan activities, including the development of MEDLARS and online searching, the Regional Medical Library (RML) network, and union listing for serials. To describe NLM's current interlibrary loan request traffic for serials and to identify any significant changes in traffic between 1959 and 1984, a comparative analysis of 1984 serial loan requests was performed, primarily by manipulation of automated request records. The changes in request traffic strongly suggest that the efforts to strengthen regional document delivery through the RML program have been successful and that NLM's collection is now used primarily as a last resort. 相似文献
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