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The heterogeneous, distributed and voluminous nature of many government and corporate data sources impose severe constraints on meeting the diverse requirements of users who analyze the data. Additionally, communication bandwidth limitations, time constraints, and multiple data formats impose further restrictions on users of these distributed data sources. In this paper, we present an Agent-based Complex QUerying and Information Retrieval Engine (ACQUIRE) for large, heterogeneous, and distributed data sources. ACQUIRE acts as a softbot or interface agent by presenting users with a view of a single, unified, homogenous data source, against which users can pose high-level declarative queries. ACQUIRE translates each such user query into a set of sub-queries by employing a combination of planning and traditional database query optimization techniques. ACQUIRE then spawns a set of mobile agents corresponding to these sub-queries, which in turn retrieve the data from various distributed data sources by dynamically optimizing the retrieval strategy as it is carried out. These mobile agents carry with them data-processing code that can be executed at the remote site, thus reducing the size of data returned by the agent. When all mobile agents have returned, ACQUIRE filters and merges the retrieved data and presents the results to the user. While the system is still very much a work in progress, current validation experiments on simulated NASA Distributed Active Archive Centers (DAACs) have demonstrated that complex queries can be effectively decomposed and retrieved by this approach. 相似文献
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Assessment of the effects of student response systems on student learning and attitudes over a broad range of biology courses 总被引：2，自引：0，他引：2
With the advent of wireless technology, new tools are available that are intended to enhance students' learning and attitudes. To assess the effectiveness of wireless student response systems in the biology curriculum at New Mexico State University, a combined study of student attitudes and performance was undertaken. A survey of students in six biology courses showed that strong majorities of students had favorable overall impressions of the use of student response systems and also thought that the technology improved their interest in the course, attendance, and understanding of course content. Students in lower-division courses had more strongly positive overall impressions than did students in upper-division courses. To assess the effects of the response systems on student learning, the number of in-class questions was varied within each course throughout the semester. Students' performance was compared on exam questions derived from lectures with low, medium, or high numbers of in-class questions. Increased use of the response systems in lecture had a positive influence on students' performance on exam questions across all six biology courses. Students not only have favorable opinions about the use of student response systems, increased use of these systems increases student learning. 相似文献
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Conditioned lick suppression by water-deprived rats was used to elaborate on recent evidence that the attenuated conditioned response elicited by an overshadowed stimulus may be enhanced by extinction of the overshadowing stimulus with which it had been trained in simultaneous compound. Using a modified serial stimulus arrangement in which a light coexisted with the last half of a tone that terminated with footshock, it was found in Experiment 1 that the tone overshadowed the light. Extinction of the tone-shock association resulted in a virtually complete recovery of the response to the overshadowed light. Using this serial overshadowing procedure, the possibility that the strength of a conditioned response to an element trained in compound covaries as a function of the strength of the response to the other element was tested in Experiment 2. Following overshadowing training similar to that of Experiment 1, independent reinforcement of the overshadowed light, that is, associative inflation, was found to have no deleterious effect on the response to the overshadowing tone. This suggests that the effects of postconditioning extinction and inflation of one element do not have symmetrical effects upon responding to the other element. The results of Experiment 2 were replicated in Experiment 3 using a simultaneous compound stimulus as opposed to the serial compound of the previous studies. These results are discussed in terms of various associative and cognitive models of learning and performance. 相似文献
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The war on cancer has been waged for nearly 40 years, yet the cancer burden remains high, especially among minority and underserved populations. One strategy to make strides in the war on cancer and its disparate impacts is to increase the diversity of the cancer research workforce. We describe an approach to recruit a diverse population of future cancer researchers from an undergraduate student population at a minority-serving land-grant institution. Specifically, we have addressed the following questions: Given the dearth of published reports of undergraduate cancer courses, is it possible for undergraduates at a land-grant institution (rather than a research or medical institution) to successfully learn cancer biology from a lecture-based course? Can we develop a template that has the potential to be used by others to develop and implement an undergraduate cancer course? Can such a course stimulate interest in careers in cancer research? Based on a learning gains analysis, students were able to learn cancer content and related skills, and based on student surveys, students'' interest in cancer research was stimulated by course participation. We have identified aspects of our course development process that were critical for the successful development, implementation, and assessment of the course. 相似文献
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Grayson Bodenheimer Stef M. Shuster 《Educational research; a review for teachers and all concerned with progress in education》2020,62(1):63-76
ABSTRACTBackground: In common with other service-oriented occupations, teaching is a profession that requires employees to engage in emotional labour. In order to perform their day-to-day roles effectively, teachers are expected to manage and utilise their emotions in nuanced ways, with a high degree of control. As research suggests a complex relationship between emotional labour and occupational burnout, it is essential to examine this further in the context of teaching, so as to better understand the issues associated with teacher burnout.Purpose: This paper aims to explore the literature on emotional labour and burnout, using the lens of sociological research to examine how multiple contexts shape people’s experiences in occupations. We present a theoretical discussion on how expectations for emotion displays and management, alongside structural factors, may shape the experiences of teachers.Sources of evidence: We reviewed literature on emotional labour and burnout to examine this relationship within the context of contemporary constraints, including educational policies, accountability and emergent interpersonal dynamics in the everyday lives of school teachers. We focussed mainly on the United States public school system and used search terms including emotional labour, emotion work, emotion management and feeling rules. An inductive analytic strategy was used to identify common themes in the literature.Findings and Conclusion: The thematic analysis of literature suggested that the intertwining of structural- and interactional-level expectations for emotional labour fosters close yet complicated relationships with teacher burnout. In bringing attention to these relationships, we offer suggestions as to the directions education researchers and administrators might take to better comprehend and address teacher burnout. 相似文献
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Claudia Shuster 《Early education and development》1994,5(4):261-276
This study explores the expectations and experiences of 37 first-time fathers about using child care and combining work and family responsibilities. Fathers completed questionnaires and participated in interviews at two home visits, the first at infant age 4-6 weeks, the second at 4-5 months. At the first visit, fathers' expectations were positively correlated with paternal self-esteem. At the second visit, fathers' experiences were positively correlated with the quality of child care, the support at their work, and their desire for their partner to work. At both visits, fathers expressed their dissatisfaction with the length of their parental leave and indicated interest in reducing their work hours. At the second visit, fathers who were spending more time caring for their infants expressed greater feelings of competence and pleasure in parenting. Outcomes of this study suggest that employer policies such as increased parental leaves and reduced work hours may enhance fathers' experiences integrating parenting and employment by providing increased opportunities for fathers to spend more time with their infant. In contrast to their partners, fathers' greater objectivity in monitoring the quality of their infant's child care suggests that fathers should be encouraged to take a more significant role. 相似文献
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Shuster M 《CBE life sciences education》2011,10(2):216-221
In recognition of the entry into the era of personalized medicine, a new set of genetics and genomics competencies for nurses was introduced in 2006. Since then, there have been a number of reports about the critical importance of these competencies for nursing practices and about the challenges of addressing these competencies in the preservice (basic science) nursing curriculum. At least one suggestion has been made to infuse genetics and genomics throughout the basic science curriculum for prenursing students. Based on this call and a review of the competencies, this study sought to assess the impact of incorporation of genetics and genomics content into a prenursing microbiology course. Broadly, two areas that address the competencies were incorporated into the course: 1) the biological basis and implications of genetic diversity and 2) the technological aspects of assessing genetic diversity in bacteria and viruses. These areas address how genetics and genomics contribute to healthcare, including diagnostics and selection of treatment. Analysis of learning gains suggests that genetics and genomics content can be learned as effectively as microbiology content in this setting. Future studies are needed to explore the most effective ways to introduce genetics and genomics technology into the prenursing curriculum. 相似文献
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