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1.
Modeling of D-STATCOM in distribution systems load flow 总被引：1，自引：0，他引：1
HOSSEINI Mehdi SHAYANFAR Heidar Ali FOTUHI-FIRUZABAD Mahmud 《浙江大学学报(A卷英文版)》2007,8(10):1532-1542
This paper presents modeling of Distribution STATCOM (D-STATCOM) in load flow calculations for the steady- state voltage compensation. An accurate model for D-STATCOM is derived to use in load flow calculations. The rating of this device as well as the direction of required reactive power injection for voltage compensation in the desired value (1 p.u.) is de- rived and discussed analytically and mathematically by the phasor diagram method. Furthermore, an efficient method for node and line identification used in load flow calculations is presented. The validity of the proposed model is examined by using two standard distribution systems consisting of 33 and 69 nodes, respectively. The best location of D-STATCOM for under voltage problem mitigation approach in the distribution networks is determined. The results validate the proposed model for D- STATCOM in large distribution systems. 相似文献
2.
Debra Nestel Roger Kneebone Carmel Nolan Kash Akhtar Ara Darzi 《Assessment & Evaluation in Higher Education》2011,36(2):171-183
Assessment of clinical skills is a critical element of undergraduate medical education. We compare a traditional approach to procedural skills assessment – the Objective Structured Clinical Examination (OSCE) with the Integrated Performance Procedural Instrument (IPPI). In both approaches, students work through ‘stations’ or ‘scenarios’ undertaking defined tasks. In the IPPI, all tasks are contextualised, requiring students to integrate technical, communication and other professional skills. The aim of this study was to explore students’ responses to these two assessments. Third‐year medical students participated in formative OSCE and IPPI sessions on consecutive days. Although performance data were collected in both assessments, quantitative data are not presented here. Group interviews with students were conducted by independent researchers. Data were analysed thematically. The OSCE and the IPPI were both valued, but for different reasons. Preference for the OSCE reflected the format of the summative assessment. The IPPI was valued for the opportunity to practise patient‐centred care in a simulated setting which integrated technical, communication and other professional skills. We posit that scenario‐based assessments such as the IPPI reflect real‐world issues of patient‐centred care. Although the limitations of this study prevent wide extrapolation, we encourage curriculum developers to consider the influence of assessments on what and how their students learn. 相似文献
3.
Mahmud Akhter ShareefAuthor VitaeUma KumarAuthor Vitae Yogesh K. DwivediAuthor Vitae 《Government Information Quarterly》2011,28(1):17-35
This research has as its objective the discovery of the critical factors that enable citizens to adopt e-Government (e-Gov) at different stages of service maturity. To accomplish the objective, this research has explained the related concepts and theories and developed a research framework grounded on a strong theoretical and literature review background. The empirical study was conducted in Canada, which is a leader in providing mature e-Gov services. From our results, we have observed two ontological differences from the present literature in the adoption behavior of e-Gov where organizational and financial perspectives have distinct implications over parsimonious technology adoption behavior. First, technology adoption model (TAM), diffusion of innovation theory (DOI), and theory of planned behavior (TPB) cannot capture and specify the complete essence of e-Gov adoption behavior of citizens. Second, e-Gov adoption behavior also differs based on service maturity levels, i.e., when functional characteristics of organizational, technological, economical, and social perspectives of e-Gov differ. Our findings indicate the critical factors that enable citizens to adopt e-Gov at different stages of service maturity. Public administrators and policy-makers have potential implications from the findings of the adoption behavior of e-Gov at different maturity levels. 相似文献
4.
The purpose of the paper is to explore Students' perception of university teaching behaviours in Pakistan. Three hundred and fifty students from the six public sector Pakistani universities returned questionnaires. Assessment framework, learning activities and instructional strategies emerged from factor analysis as common factors. Students' views on five conceptual variables were also analysed: instructional design, active teaching, learning activities, questioning styles; and assessment framework. University teaching in Pakistan was found to be driven by assessment. This is a matter of concern for all stake holders, including the administration of the universities, teachers, students and the Higher Education Commission. A teaching behaviour paradigm shift is required, switching from knowledge-oriented teaching behaviour focused on successful passage through assessment, to teaching behaviour focused upon the development of transferable skills demanded by external markets. 相似文献
5.
Imran Ghous Zhaoxia Duan Jahanzeb Akhtar Muhammad Jawad 《Journal of The Franklin Institute》2019,356(16):9407-9431
This paper aims to solve the problem of sliding mode control for an uncertain two-dimensional (2-D) systems with states having time-varying delays. The uncertainties in the system dynamics are constituted of mismatched uncertain parameters and the unknown nonlinear bounded function. The proposed problem utilizes the model transformation approach. By segregating the proper Lyapunov–Krasovskii functional in concert with the improved version of Wirtinger-based summation inequality, sufficient solvability conditions for the existence of linear switching surfaces have been put forward, which ensure the asymptotical stability of the reduced-order equivalent sliding mode dynamics. Then, we solve the controller synthesis problem by extending the recently proposed reaching law to 2-D systems, whose proportional part is appropriately scaled by the factor that does not depend on some constant terms but rather on current switching surface’s value, which in turn ensures the faster convergence and better robustness against uncertainties. Finally, the proposed results have been validated through an implementation to a suitable physical system. 相似文献
6.
The perspective of six Malaysian students on playing video games： Beneficial or detrimental？ 总被引：1，自引：0，他引：1
Roselan Baki Eow Yee Leng Wan Zah Wan Ali Rosnaini Mahmud Mohd. Sahandri Gani Hamzah 《美中教育评论》2008,5(11):11-21
This study provides a glimpse into understanding the potential benefits as well as harm of playing video games from the perspective of six Malaysian secondary school students, aged 16-17 years old. The rationale of the study is to enable parents, educators, administrators and policy makers to develop a sound understanding on the impact of playing video games before making any judgment on the contemporary youth culture. Thus, further decision on the acceptance of video games as a new innovation in school or at home could be considered. Although this study is not very extensive, the findings suggest that playing video games contributes to cognitive, social, motivational and emotional development. However, potential harms do exist. Parents play an important role in guiding their children either directly or indirectly, as indicated by the respective students. Caution is advised in the interpretation of the study＇s findings as it is solely based on the perspectives of the students, as the first person＇s views. Nevertheless, each student has their very own perspective on the impact of video games on them. 相似文献
7.
Ali Shoukot Sarker Md Fouad Hossain Islam M. Saiful Islam Md Kabirul Al Mahmud Rafi 《Tertiary Education and Management》2021,27(2):91-106
Tertiary Education and Management - This study examines how students from rural areas in Bangladesh face particular challenges in adapting to university dormitories in urban areas. There has been... 相似文献
8.
2 studies of word learning are reported. In Study 1, 24-month-old children and 2 adults played with 3 nameless objects. These objects were placed in a clear box along with a novel nameless object. The adults then displayed excitement about the contents of the box and modeled a new word. Comparison with a control condition indicated significant learning of the new word for the novel object. Study 2 followed the same procedure with one difference: the children played with the novel object while the adults were absent. Thus, at the time of the language model the target object was novel only to the adults, not to the children. Again subjects displayed significant learning of the new word. This last finding suggests that 24-month-old children understand that adults use language for things that are novel to the discourse context and that this novelty is determined from the speaker's point of view. 相似文献
9.
The growing number of private schools in India, especially those accepting children from underprivileged households, has been considered demand driven. In contrast to this understanding, this paper argues that low-income parents in Okhla and Badarpur in Delhi, India, are compelled to send their children to private unaided recognised and unrecognised schools. These schools are used as interim schools during primary or elementary grades because of the perceived danger of sending younger children to distant government schools. Our findings show that parents encounter school choice dilemmas in three stages. Parents prefer sending their children to government schools, but being Muslim, they also prefer faith-based teaching in an Islamic environment, which they expect from government schools but not from private schools. Moreover, they prefer schools that offer all grades, do not charge fees, and have honest teachers who teach effectively, are dedicated and affectionate, and will instil discipline in their children. 相似文献
10.
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