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1.
李伟明 《重庆大学学报(英文版)》2005,4(1):47-49
1 Introduction With advances in networking technology, iSCSI allows for the deployment of storage networks over a commodity internet. However providing storage services across networks increases communication costs: requests and results must be transported between iSCSI Initiator and iSCSI target [1,2]. Intensive overhead caused by network I/O limits the capacity of servers. This makes the study of iSCSI performance an import research topic. Earlier researches closely measure the perfo… 相似文献
2.
Although genetic algorithm has become very famous with its global searching,parallel computing,better robustness,and not needing differential information during evolution.However,it also has some demerits,such as slow convergence speed.In this paper,based on several general theorems,an improved genetic algorithm using variant chromosome length and probability of crossover and mutation is proposed,and its main idea is as follows:at the beginning of evolution,our solution with shorter length chromosome and higher probability of crossover and mutation;and at the vicinity of global optimum,with longer length chromosome and lower probability of crossover and mutation.Finally,testing with some critical functions shows that our solution can improve the convergence speed of genetic algorithm significantly,its comprehensive performance is better than that of the genetic algorithm which only reserves best individual. 相似文献
3.
Leon E. Smith 《Quest (Human Kinetics)》2013,65(1):74-83
One purpose of teacher education is to help future teachers develop the necessary knowledge, abilities, and skill for good teaching. A second purpose is to develop the commitment to use this knowledge, ability, and skill when trainees graduate from the training program and begin their teaching careers. There is evidence to suggest that teacher education programs can successfully achieve the first purpose, but success in the development of commitment to good teaching has not yet been demonstrated. By applying Becker's conception of commitment, a two-step plan for developing commitment in teacher education is proposed. The first step is to identify and assess commitment, the second step is to record behavioral indicators of commitment and to use these records to help future teachers develop commitment. In physical education, the improvement of teaching is vital to the future of the field; thus it is critical that teacher education programs help their students develop commitment to good teaching as well as develop effective teaching skills 相似文献
4.
Digital technologies have been used for measurement purposes and whether the test medium influences the user is an important issue. The aim of this study is to investigate students?? performances and duration differences between online and paper?Cpencil tests. An online testing tool was developed and administered in order to determine the differences between the traditional paper?Cpencil tests and online tests concerning students?? performances and the duration on tests. This tool enables to add questions that utilize an online database and which are in the form of multiple choice (with 5 or 4 options), true?Cfalse, matching, filling in the blanks, with multiple answers, with short answers, with long answers, and it also enables to prepare tests and to turn them into paper?Cpencil test mode. Performance test was applied with both online and paper?Cpencil modes on junior students at one of the universities in Turkey. Besides, the online testing tool developed within the context of the study was evaluated by instructors with respect to usability, relevance to the purpose and design. Instructor and student questionnaires are developed to determine the opinions on the online testing tool and online tests. Results showed that there was no significant differences between the performances on online and paper?Cpencil tests. On the other hand, the time they spent on the online test has been longer than the time they spent on paper?Cpencil test. Students found the online testing tool easy to use and stated that online test medium is more comfortable than paper?Cpencil tests. However, they complained about external noises, tiredness, and focusing problems regarding the online examination mediums. Generally, instructors have also appreciated the online testing tool??s design and they agree on the fact that it serves for its purposes. 相似文献
5.
Clay Carr 《Performance Improvement Quarterly》1993,6(4):115-126
Books and articles promoting “diversity” abound. Many of their authors are not clear what they mean by diversity. Many seem to be naive about the amount of conflict “diversity” can engender. And almost all authors assume–without presenting any meaningful evidence–that diversity is somehow good for organizations. This article attempts to define diversity, suggest the conflict that is often associated with it, and then investigate the conditions (if any) under which diversity with its attendant conflict can benefit the organization. 相似文献
6.
Terence O'Mahony 《School Leadership & Management》2013,33(4):373-384
This article reports on an empirical study of the management of curriculum and instruction in South African secondary schools. Drawing on data collected from 200 schools in 2007, a series of regression analyses tested the relationship between various dimensions of leadership and student achievement gains over time. Whilst the research confirms what we do know about school management in South Africa, and aligns with much of the international research base, the strong emphasis that emerges on school–community relations offers important insights for school management development. 相似文献
7.
In recent years, much attention has been devoted to the design and operation of bearings made of elastic metal plastic (EMP). The surface of the bearing bush is covered by a layer of polymer PTFE(polytetrafluoroethylene). The physical performances of the polymer are quite different from that of metal. It can reduce friction because of its lower surface energy, and it is more difficult for the fluid to be adhered. Consequently, the slip will exist at the oil-bush interface. The journal bearings made of this material are researched in this article. Through test, the existence of slip is proven and the equation of the slip velocity for the EMP journal bearing is established when shear stress up to a certain value. Thus, the classical Reynolds equation is modified. The lubrication mechanism is analyzed by some simulation results. 相似文献
8.
Yiling Yao Qiping Kong Jinfa Cai 《International Journal of Science and Mathematics Education》2018,16(1):107-127
Students in Shanghai ranked at the top in mathematics on the past two assessments of the Program for International Student Assessment (PISA). However, even though Asian students in general, and Chinese students in particular, ranked at the top in mathematics, we know little about Shanghai students’ subjective well-being (SWB). This paper reports two studies that investigated the SWB of elementary and middle school students in Shanghai, as well as their mathematics performance. It is found that the mean scores of elementary school students on all scales of SWB are significantly higher than those of middle school students, representing a large drop for students when moving from elementary to middle school. Furthermore, students’ mathematics performance is moderately correlated with their SWB. And for Grade 6, students’ SWB affects their mathematics performance, especially from academic self-concept, attentiveness in the classroom, and relationship with teachers. 相似文献
9.
Oil-soluble stannous naphthenate (SN) is synthesized by using naphthenatic acid and SnO. And its molecular structure is confirmed by IR and multielement oil analyzer (MOA). The tribological performances of the organotin as lubricant additive are evaluated with a four-ball friction and wear tester. These experiments indicate that the wear scar diameter (WSD) and friction coefficient are diminished while the load-carrying capability increased by comparison with that of base oil. The elemental composition of the boundary lubricating film is examined by means of Auger electron spectroscopy (AES). Synergistic effect is found in the load-carrying capability of the complex of SN and sulfured olefin. The analytical results of AES indicate that the good performance of stannous naphthenate is attributed to the formation of a boundary lubricating film containing Sn on the rubbed surface. 相似文献
10.
This study examined the effect of strategy instruction and incentives on performance, confidence, and calibration accuracy. Individuals (N = 107) in randomly assigned treatment groups received a multicomponent strategy instruction intervention, financial incentives for high performance, or both. The authors predicted that incentives would improve performance, while strategy instruction would improve performance, confidence, and calibration accuracy as a result of better monitoring and self-regulation of learning. The authors compared pre- and posttest items and 20 new posttest-only items. They found significant effects for strategy training on performance, confidence, and calibration accuracy, as well as the interaction between strategy training and time on calibration accuracy. Incentives improved performance and calibration accuracy, either directly, or through an interaction with strategy training. Implications for future research are discussed. 相似文献
11.
Kamil Özerk 《Scandinavian Journal of Educational Research》2013,57(4):353-367
This article is a result of a small-scale study with the purpose of investigating teacher-student verbal interactions and questioning and students' curriculum-related performance in small and large mainstream classes. In mainstream classes the bilingual students were taught together with their monolingual Norwegian peers. The study shows that there are inter-group and intra-group differences with respect to: (i) teacher-student verbal interaction; (ii) academic questioning; (iii) curriculum-related performance of students in small classes compared with large classes. The bilingual minority students in general, and bilingual minority girls in particular, benefit from civics lessons in small classes more than they do in large classes. It is suggested that by creating rich possibilities for teacher-student verbal interaction and curriculum-oriented academic questioning, small classes can provide conditions for better academic performance in content area subjects, i.e. civics, for bilingual students in general and bilingual girls in particular than do large classes. 相似文献
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13.
The current study investigated how changes in psychological (cognitions and emotions) and physiological (cortisol concentrations) threat/challenge responses develop over the course of a presentation and whether initial intensity levels and their changes are related to self-efficacy and presentation performance. Based on the Trier Social Stress Test (TSST), 123 students held video-recorded presentations about their dream job, which were evaluated by three raters. Selfefficacy was measured before the TSST, saliva cortisol concentrations and psychological threat and challenge responses three times during the TSST. Data were analyzed with latent growth modeling. Threat and cortisol increased during the presentation, while challenge decreased. The growth curve coefficients of challenge correlated negatively with the respective coefficients of threat. Also, initial intensity of challenge responses correlated positively with corresponding cortisol concentrations. Higher self-efficacy was associated with higher initial intensity of challenge responses, lower corresponding concentrations of cortisol, and a smaller cortisol increase, but neither with the growth curve coefficients of threat responses nor with presentation performance. Better performance was associated with lower initial intensity of threat and a smaller increase in cortisol. Threat responses and increasing cortisol concentration appear to inhibit presentation performance, while self-efficacy may strengthen challenge responses and reduce corresponding levels of cortisol concentration as well as its increase. 相似文献
14.
Dawn M. Aziz 《Performance Improvement》2013,52(6):28-35
What are the similarities and differences between instructional systems design, organization development, and human performance technology/improvement (HPT/HPI)? This article defines these fields and highlights how they contribute to the performance improvement domain. With Rossett's view of HPT as a “perspective, or habit of mind, that inclines us towards data, analysis, systems, alignment and partnerships” (A. Rossett, personal communication, October 28, 2012), HPT/HPI will be presented as the overarching framework for selecting and measuring instructional systems design or organization development interventions. 相似文献
15.
Sharon A. Shrock 《Performance Improvement Quarterly》1990,3(4):12-33
There is now widespread agreement that America's schools are in serious trouble. However, there is little consensus regarding what should be done about it. The school reforms currently being suggested are the most radical since the elimination of the one room school. School reforms of the 1980s—personnel selection, job redesign, evaluation/ feedback, incentives, instructional technology, and organization rede-sign—are reviewed from a performance technology perspectivee Reasons for their lack of success are discussed, in particular the schools' lack of interest in instructional design and technology. The most likely future reforms, those that involve the organizational redesign of schools, are discussed along with the impact such changes would have on the potential for applying performance technology in the schools. The paper concludes with actions that performance technologists in both business and academic environments can take to encourage the application of their technologies in the schools. 相似文献
16.
The authors investigated the effects of an exploratory value-reappraisal intervention on students’ motivation and performance in an undergraduate introductory statistics course. They sampled 82 students from 2 instructors’ sections during both the fall and spring semesters. Students were randomly assigned within each section to either the Value-Reappraisal (VR) or Control condition (C). VR presented messages about the importance of statistics and guided students in exploring potential values of learning statistics. Results showed positive effects of VR on task value, endogenous instrumentality, and a choice-behavior measure of interest. The authors found VR to affect exam performance, but only for students who had a particular instructor. This research helps broaden literature on self-regulation and expectancy-value models of motivation by focusing on the regulation of value perceptions. 相似文献
17.
Charlotte Scherer 《Journal of Experimental Education》2013,81(3):208-214
This research was designed to determine whether (1) selecting a pre-student teaching field-based experience brought about significant differences in secondary student teachers’ self-concepts and performance; and (2) whether self-concept scores were predictors of performance ratings. Student teachers who had selected Project Interaction (PI) and those who had no early field experience (NF) were pre-and posttested on four self-concept variables, and rated on performance by cooperating teachers, supervisors, and by self-ratings. Pretest self-concept scores were correlated with performance ratings. Results indicated the PI group had significantly more conflict on the pretest, which was reversed on the posttest to produce a trend toward significantly less conflict. The PI group had significantly higher self-esteem than the NF group on the posttest. No significant differences were found on performance ratings, but cooperating teachers’ ratings did correlate with pretest self-concept scores. It was concluded that early field experience appeared to have latent positive effects on self-concept. 相似文献
18.
LONG Teng-rui CAO Yan-xiao ZHANG Hong-jing GAO Xiao-tao 《重庆大学学报(英文版)》2006,5(4):223-228
1 Introduction a Water eutrophication becomes increasingly serious owing to untreated or illegally discharged domestic as well as industrial wastewater. Hopefully, more strict requirements for nitrogen and phosphorus removal have been set in new wastewate… 相似文献
19.
Performance management is one aspect of major reforms which have transformed the public sector workforce in Australia and other Western countries since the 1980s. Embedded in the discourse of managerialism, performance management represents an attempt by the state to make workers—in this case teachers—more efficient, more effective and more accountable. In this paper we want to explore and compare a number of perspectives on performance management. Firstly, we consider several evaluation studies which have been undertaken in various contexts over recent years. These studies tend to take for granted the assumptions behind performance management and to judge its effectiveness within the framework of managerial thinking itself. Secondly, we review the critical literature which locates performance management in a broader social and political context and considers the interests it might serve. Finally, we present the perspectives of a focus group of teachers who are currently ‘being performance managed’ and reflect on the relationship between their stories, the official rhetoric of their education system and the views expressed in the literature. 相似文献
20.
Research in Science Education - The aim of this study was to determine the impact of three different software simulations for studying Ohm’s law and connecting resistors on students’... 相似文献