一种有效的余弦调制滤波器组的设计方法     

刘孟娟  胡阿丽 《陕西广播电视大学学报》2009,11(1):93-96

本文给出了一种有效的余弦调制滤波器组的设计方法。这种算法采用了内插法和迭代算法相结合设计原型滤波器,目标函数表示为滤波器系数的四次方,用迭代算法来优化滤波器的系数。这种方法使需要优化的参数大大减少。最后的实例仿真,验证了此算法的有效性。  相似文献   

Internationalization of higher education： Challenges, strategies, policies and programs   总被引：1，自引：0，他引：1  

Akbar Zolfaghari Mohammad Shatar Sabran Ali Zolfaghari 《美中教育评论》2009,6(5):1-8,20

In today＇s changing world, the idea of internationalization of higher education especially in developing countries has been deduced from globalization of education process. The international aspect of higher education is becoming increasingly important, composite, and confusing. The higher education has an effect on the society through policy-making, funding, and planning. The purpose of this paper is to analyze the meaning, definition, importance, necessity, and pre-requisites of internationalization of higher education. This paper also studies the programs and strategies of internationalization of higher education. Key challenges for the future direction of internationalization are identified in this paper.  相似文献   

Organizational culture,values, and routines in Iranian medical schools     

Ali Bikmoradi  Mats Brommels  Alireza Shoghli  Davoud Khorasani Zavareh  Italo Masiello 《Higher Education》2009,57(4):417-427

In Iran, restructuring of medical education and the health care delivery system in 1985 resulted in a rapid shift from elite to mass education, ultimately leading to an increase in the number of medical schools, faculties, and programs and as well as some complications. This study aimed to investigate views on academic culture, values, and routines held by faculty members. A nation-wide survey conducted in six public medical schools in Iran. The research findings show weak organizational culture and values, together with routine behaviors sensed as a negative and low satisfaction with academic leadership. The research evidence suggests bureaucracy, politicization, conservativeness, and centralization as common features of medical schools in Iran and also suggests suitable supervisory skills to tackle the tension between governmental management and academic leadership with cultural changes, the creation of new values, and adoption more efficient routines.  相似文献   

Integrating Gender and Group Differences into Bridging Strategy     

Serkan Y?lmaz  Ali Ery?lmaz 《Journal of Science Education and Technology》2010,19(4):341-355

The main goal of this study was to integrate gender and group effect into bridging strategy in order to assess the effect of bridging analogy-based instruction on sophomore students’ misconceptions in Newton’s Third Law. Specifically, the authors developed and benefited from anchoring analogy diagnostic test to merge the effect of group and gender into the strategy. Newton’s third law misconception test, attitude scale toward Newton’s third law, and classroom observation checklists were the other measuring tools utilized throughout this quasi-experimental study. The researchers also developed or used several teaching/learning materials such as gender and group splitted concept diagrams, lesson plans, gender splitted frequency tables, make sense scales, PowerPoint slides, flash cards, and demonstrations. The convenience sample of the study chosen from the accessible population involved 308 students from two public universities. The results of multivariate analysis of covariance indicated that the bridging strategy had a significant effect on students’ misconceptions in Newton’s third law whereas it had no significant effect on students’ attitudes toward Newton’s third law.  相似文献   

Learning materials recommendation using good learners’ ratings and content-based filtering   总被引：1，自引：0，他引：1  

Khairil Imran Ghauth  Nor Aniza Abdullah 《Educational technology research and development : ETR & D》2010,58(6):711-727

The enormity of the amount of learning materials in e-learning has led to the difficulty of locating suitable learning materials for a particular learning topic, creating the need for recommendation tools within a learning context. In this paper, we aim to address this need by proposing a novel e-learning recommender system framework that is based on two conceptual foundations—peer learning and social learning theories that encourage students to cooperate and learn among themselves. Our proposed framework works on the idea of recommending learning materials with a similar content and indicating the quality of learning materials based on good learners’ ratings. A comprehensive set of experiments were conducted to measure the system accuracy and its impact on learner’s performance. The obtained results show that the proposed e-learning recommender system has a significant improvement in the post-test of about 12.16% with the effect size of 0.6 and 13.11% with the effect size of 0.53 when compared to the e-learning with a content-based recommender system and the e-learning without a recommender system, respectively. Furthermore, the proposed recommender system performed better in terms of having a small rating deviation and a higher precision as compared to e-learning with a content-based recommender system.  相似文献   

Entrepreneurial attributes among postgraduate students of a Pakistani university     

Akhtar Ali Keith J. Topping Riaz H. Tariq 《美中教育评论》2010,7(5):66-77

This paper explores entrepreneurial attributes among the students of The Islamia University of Bahawalpur, a public sector Pakistani university. Multistage sampling was employed to maximize the representation. Five hundred and twenty one master＇s level students from thirty departments returned completed questionnaires. Three factors emerged： self efficacy, efficiency and commitment, and entrepreneurial inclinations. The majority of the students exhibited positive entrepreneurial attributes. However, there was no significant difference between negative and positive entrepreneurial attributes. There was no significant impact of demographic variables such as gender, parental income and profession on entrepreneurial attributes. Impact on practice and policy is discussed.  相似文献   

An approach to develop physics student teachers＇ skills of using instructional technology     

Devecioglu Yasemin Akdeniz Ali Riza 《美中教育评论》2010,7(8):95-101

It is very important to develop student teachers＇ skills and knowledge during the pre-service teacher education process. In this study, the effectiveness of the approach in which student teachers＇ gained skills of developing and using TGMs （teacher-guided materials） based on integration of technology on physics education in STMC-Ⅱ （Special Teaching Methods Course-Ⅱ） for pre-service physics teachers was evaluated. The study was conducted with 33 physics student teachers in KTU （Karadeniz Technical University）. Student teachers were required to develop and present TGMs, which were based on principles of special teaching approaches and techniques and integration of technology through instruction. The data of the study were gained from semi-structured interviews conducted with 14 student teachers, observations of the lessons conducted by each student teacher and document analysis of the student teachers＇ diaries collected during the term. The student teachers stated that STMC-11 was a very helpful experience to gain teaching skills. It is believed that all these activities, which are designed and performed in the classroom by student teachers during STMC-Ⅱ course, will not only prepare them for their teaching but also help them gain basic experiences that they will need in their future career. At the end of the process, it is concluded that all the student teachers gained nearly the whole defined aims--skills and knowledge of the STMC-Ⅱ. The implementation process should be organized very well to have advance of gaining many skills together. Key words： physics student teacher; STMC-Ⅱ; the skills of developing TGMs and integration of technology  相似文献   

An analysis of the cultural representation of disability in school textbooks in Iran and England     

Alan Hodkinson  Ali Salami 《Education 3-13》2018,46(1):27-36

The paper details the findings of a study which focused on the analysis of the cultural representation of disability in school textbooks in Iran and England. The paper argues that whilst inclusive education could facilitate the incorporating of disabled pupils into mainstream schools, there needs to be deeper examination as to how this transition should take place for children aged 3–13. The paper suggests that in such examinations, school textbooks might be of significance in familiarising non-disabled pupils, teachers and authorities with the issues related to disability and disabled pupils.  相似文献   

Current status of cadaver sources in Turkey and a wake‐up call for Turkish anatomists          下载免费PDF全文

İlke Ali Gürses  Osman Coşkun  Adnan Öztürk 《Anatomical sciences education》2018,11(2):155-165

Persisting difficulties in body procurement in Turkey led to the acquisition of donated, unclaimed, autopsied, and imported bodies regulated under current legislature. Yet, no study had investigated the extent of the on‐going cadaver problem. This study was aimed to outline cadaver sources in anatomy departments and their effectiveness by means of an online survey. Additionally, official websites of each department were investigated regarding any information on body donation. Unclaimed cadavers (84.8%) were the major source for anatomy departments, followed by donated (50%) and imported cadavers (39.1%). Foundation‐based medical faculties were more likely to import cadavers (P = 0.008). There was a moderate increase (r_s = 0.567; P = 0.018) in donation registrations to our department after 2000. The departments in cities with significantly higher City‐Based Gross Domestic Product measures (US$9,900 vs. US$16,772, P = 0.041), frequencies for mid‐ or high‐school graduates (30.4% vs. 31.3%, P = 0.041), and frequencies for under‐ or post‐graduates (13.1% vs. 15.8%, P = 0.24) had managed to use donated cadavers. Anatomy departments’ major reasons for using unclaimed cadavers were education (45.9%), unclaimed cadavers being the only source (24.3%), and receiving inadequate donations (21.6%). Nine out of seventy‐four departments (12.2%) provided information regarding body donation on their websites. Body procurement remains as a serious problem in Turkey and it is apparent that current legislature does not provide a sufficient cadaver inflow. Similarly, anatomy departments’ effectiveness in public awareness of body donation and support in the National Body Donation Campaign seems questionable. Anat Sci Educ 11: 155–165. © 2017 American Association of Anatomists.  相似文献   

Error analysis of TAS/MRC in Rayleigh fading channel with non-Gaussian noise     

Amer M. Magableh  Osamah S. Badarneh  Imran Shafique Ansari  Taimour Aldalgamouni 《Journal of The Franklin Institute》2018,355(14):6877-6888

Transmit antenna selection with maximal ratio combining at the receiver (TAS/MRC) is a promising technique that can be used to avoid the hardware complexity of multiple input multiple output (MIMO) system without jeopardizing the diversity gain. The generalized Gaussian distribution (GGD) is used to model different kinds of additive noise including Gaussian, Laplacian, uniform, and impulsive. In this paper, we study the bit error performance of TAS/MRC system assuming flat Rayleigh fading channels perturbed by additive white generalized Gaussian noise (AWGGN). To this end, we provide a closed form expression for the average bit error rate of coherent modulation techniques in terms of Mejier’s G function that is readily available in many commercial mathematical software packages like MATLAB and Mathematica. Moreover, we study the asymptotic behavior of the BER at high signal to noise ratio (SNR). Analytical results are verified by simulation.  相似文献