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61.
A computer-aided method for simplification and identification of linear discrete systems via step-response matching is presented. Golub's algorithm for solving least-squares problem is used to find the optimum coefficients of the reduced model. The advantages of this method are (1) for model reduction, both the time response and frequency response within the bandwidth region of the reduced model are very close to those of the original system; and (2) for system identification, the identified model is very close to the original system. In the illustrative examples considered in this paper the results of the proposed method appear to be better than those of other methods in the current literature.  相似文献   
62.
經過了前面幾節的討論,我們對於在傳統性别文化中女性作者的艱難處境,可以說已有了相當的體認.  相似文献   
63.

volume contents

Volume XXXIV, 2004  相似文献   
64.
Econometric studies suggest that student achievement may be improved if high-performing teachers are substituted for low-performing teachers. Drawing upon a recent study linking teacher performance on licensure exams with gains in student achievement, an analysis was conducted to determine the cost-effectiveness of requiring teacher applicants to meet a minimum 1000 SAT test score requirement, while raising teacher salaries by 45 percent in order to maintain an adequate pool of candidates. Results indicate that the cost-effectiveness of this approach to raising teacher quality is substantially lower than the cost-effectiveness of a competing approach for raising student achievement, involving the implementation of systems that provide formative assessment feedback to students and teachers regarding student performance in math and reading. The implementation of formative assessment instead of less cost-effective approaches would help to achieve the important goal of raising math and reading achievement while using fewer resources. The savings in resources may then be used to achieve other important educational goals—those that are not well-addressed through formative assessment.  相似文献   
65.
The teacher–student writing conference has long been recognized as being able to provide personalized instruction and contribute to learners’ writing development. However, teachers often find it time-consuming to conference with individual students on a regular basis. Conferencing with pairs of students, therefore, may become a more pragmatic option. While a promising approach, so far the practice of paired conferencing has received scant research attention. This exploratory case study investigated the dynamics of paired conferences held between 1 writing instructor and 23 Chinese-speaking undergraduates learning English as a foreign language, as well as students’ perceptions of paired conferencing. Data collected included 11 videotaped conferences, audiotaped interviews with the instructor and students, and a student questionnaire. Through a discourse analysis performed on the conference data, this study found that to justify and facilitate paired conferencing, the instructor employed strategies such as assigning pre-conference peer review, identifying shared problems, and involving the other tutee in problem solving. Results also indicated that peer interaction during the conference was limited, but the pre-conference peer review seemed to contribute to learners’ awareness of their own strengths and weaknesses. Overall, this study showed that students held favorable opinions about paired conferencing although sharing teacher time and attention might still be a concern with some students.  相似文献   
66.
Research on the roles of the board of unitary board systems is well established, while explorations of dual board systems are very limited. We know little about nonprofit sport organisations board roles in countries such as Taiwan that operate with a dual board structure. In consequence, this study explored the roles taken by the board of directors and the board of supervisors in Taiwanese nonprofit sport organisations. Four overarching board of director roles were identified: manage vision and purpose; board duty; human resource and fundraising; and stakeholder focus. For the board of supervisors two primary functions emerged: monitoring results; and board duty and process. The findings of the study extend our understanding of the governance of nonprofit sport organisations and the differences that exist between dual board and single board systems of governance.  相似文献   
67.
一 序論 "詞衰於明",這幾乎是研究詞與詞史之人的一個普遍共識.即如劉毓盤之<詞史>,就曾寫有專章,題曰"論明人詞之不振"①.吴梅之<詞學通論>亦以為"詞至明代可謂中衰之期"②,至於王易之<詞曲史>,則直指明詞為"入病"③.  相似文献   
68.
Cell rotation using optoelectronic tweezers   总被引:1,自引:0,他引:1  
A cell rotation method by using optoelectronic tweezers (OET) is reported. The binary image of a typical OET device, whose light and dark sides act as two sets of parallel plates with different ac voltages, was used to create a rotating electric field. Its feasibility for application to electrorotation of cells was demonstrated by rotating Ramos and yeast cells in their pitch axes. The electrorotation by using OET devices is dependent on the medium and cells' electrical properties, the cells' positions, and the OET device's geometrical dimension, as well as the frequency of the electric field.  相似文献   
69.
Technological pedagogical content knowledge TPACK refers to the knowledge set that teachers currently use to further improve the quality of their teaching and assist their students in learning. Several TPACK models have been proposed, either for discussing TPACK's possible composition or its practical applications. Considering that teachers' practical experiences should also be critical to the development of those teachers' knowledge, this study invited a research panel (six researchers) and an expert panel (54 science‐related educators) to propose and validate the framework of TPACK‐practical. After two rounds of anonymous communications that followed Delphi survey techniques, a total of eight dimensions of TPACK‐practical and corresponding indicators were identified and rated as having high levels of importance. Among these knowledge dimensions, the knowledge of direct information and communication technology uses for enhancing teachers' professionalism and students' conceptual comprehension was rated with a high level of importance. Also, disciplinary differences were found to exist between the different groups of experts. Biology teachers showed significantly higher ratings across all knowledge dimensions, whereas physics teachers' ratings were comparatively low. Such findings suggest that the structure and content of subject matter shapes not only the way they teach with technology but also the thinking logics they build longitudinally from their learning experiences.  相似文献   
70.
Although emerging consensus exists that practice-based approaches to teacher preparation assist in closing the distance between university coursework and fieldwork experiences and in assuring that future teachers learn to implement innovative research-based instructional strategies, little empirical research has investigated teacher learning from this approach. This study examines the impact of a video- and practice-based course on prospective teachers’ mathematics classroom practices and analysis of their own teaching. Two groups of elementary prospective teachers participated in the study—one attended the course and one did not. Findings reveal that the course assisted participants in making student thinking visible and in pursuing it further during instruction and in conducting evidence-based analyses of their own teaching. Conclusions discuss the importance of teaching these skills systematically during teacher preparation.  相似文献   
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