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Antonio Mauricio F.L. Miranda de S Danton D. Ferreira Edson W. Dias Eduardo M.A.M. Mendes Leonardo B. Felix 《Journal of The Franklin Institute》2009,346(9):841-853
The present work deals with recent results on the sampling distribution of the magnitude-squared coherence (also called just coherence) estimate between a random (Gaussian) and a periodic signal, in order to obtain analytical critical values, alternative expressions for the probability density function (PDF) as well as the variance and bias of the estimate. A comparison with the more general case of coherence estimation when both signals are Gaussian was also provided. The results indicate that the smaller the true coherence (TC) values the closer both distributions become. The behaviour of variance and bias as a function of the number of data segments and the TC is similar for both coherence estimates. Additionally, the effect of a normalizing function (Fisher's z transform) in the coherence estimated between a random and a periodic signal was also evaluated and normality has been nearly achieved. However, the variance was less equalized in comparison with coherence estimate between two Gaussian signals. 相似文献
64.
费利克斯·利布罗 《中国远程教育(综合版)》2005,(9):52-58
本文首先简要介绍菲律宾的教育制度以及远程教育的历史发展,然后讨论菲律宾大学开放大学(简称菲律宾开放大学)在菲律宾远程教育中所起的作用、大学的学术课程、学生支持服务、课程发展、与其他机构的合作、全国性学习中心网络以及导师制.文章最后总结了菲律宾开放大学在过去十年发展中的经验. 相似文献
65.
Felix de Moya-Anegon Vicente P. Guerrero-Bote Carmen Lopez-Illescas Henk F. Moed 《Journal of Informetrics》2018,12(4):1251-1262
This paper presents a statistical analysis of the relationship between three science indicators applied in earlier bibliometric studies, namely research leadership based on corresponding authorship, international collaboration using international co-authorship data, and field-normalized citation impact. Indicators at the level of countries are extracted from the SIR database created by SCImago Research Group from publication records indexed for Elsevier’s Scopus. The relationship between authorship and citation-based indicators is found to be complex, as it reflects a country’s phase of scientific development and the coverage policy of the database. Moreover, one should distinguish a genuine leadership effect from a purely statistical effect due to fractional counting. Further analyses at the level of institutions and qualitative validation studies are recommended. 相似文献
66.
To improve college students'reading comprehension,the author studies student factors-patience and reading motivation.The author views that reading motivation is the main element,and analyzes the instrumental motivation,enjoys mental motivation and the relation between the reading proficiency and the above motivations.Therefore,advice on the English reading teaching is put forward. 相似文献
67.
Difficulties in teaching a multi-disciplinary subject such as the mechatronics system design module in Departments of Mechatronics Engineering at Temasek Polytechnic arise from the gap in experience and skill among staff and students who have different backgrounds in mechanical, computer and electrical engineering within the Mechatronics Department. The departments piloted a new vertical stream curricula model (VSCAM) to enhance student learning in mechatronics system design through integration of educational activities from the first to the second year of the course. In this case study, a problem-based learning (PBL) method on an autonomous vacuum robot in the mechatronics systems design module was proposed to allow the students to have hands-on experience in the mechatronics system design. The proposed works included in PBL consist of seminar sessions, weekly works and project presentation to provide holistic assessment on teamwork and individual contributions. At the end of VSCAM, an integrative evaluation was conducted using confidence logs, attitude surveys and questionnaires. It was found that the activities were quite appreciated by the participating staff and students. Hence, PBL has served as an effective pedagogical framework for teaching multidisciplinary subjects in mechatronics engineering education if adequate guidance and support are given to staff and students. 相似文献
68.
This study investigated the roles of phoneme position, stress, and proficiency in L2 spelling development by Taiwanese students
learning English as a Foreign Language (EFL), an alphabetic writing system typologically different from the learners’ L1 logographic
system. Structured nonword spelling tests were administered to EFL sixth-graders with lower and higher English proficiency
level. The results showed that overall, final phonemes were spelled more poorly than their initial and medial counterparts;
however, phoneme position effect decreased as learners’ English proficiency improved. Secondly, spelling of the stressed syllable
was significantly better than that of the unstressed syllable. However, when phonemes were held constant, stress effect was
significant only in the first, but not in the second syllable. Thirdly, higher proficient EFL children spelled significantly
better than their lower proficient counterparts, and spelling errors were more systematic in the former. The findings of the
study are discussed from linguistic, psychological, and developmental perspectives. 相似文献
69.
Kapp Felix Spangenberger Pia Kruse Linda Narciss Susanne 《Metacognition and Learning》2019,14(3):387-411
Metacognition and Learning - Self-evaluation of one’s competences is considered a core factor in various domains of human functioning, including learning and instruction, as well as academic... 相似文献
70.
Human children 18-24 months of age and 3 young chimpanzees interacted in 4 cooperative activities with a human adult partner. The human children successfully participated in cooperative problem-solving activities and social games, whereas the chimpanzees were uninterested in the social games. As an experimental manipulation, in each task the adult partner stopped participating at a specific point during the activity. All children produced at least one communicative attempt to reengage him, perhaps suggesting that they were trying to reinstate a shared goal. No chimpanzee ever made any communicative attempt to reengage the partner. These results are interpreted as evidence for a uniquely human form of cooperative activity involving shared intentionality that emerges in the second year of life. 相似文献