Optimal non-parametric tuning of PID controllers based on classification of shapes of oscillations in modified relay feedback test     

Ahmed Rehan  Igor Boiko  Yahya Zweiri 《Journal of The Franklin Institute》2021,358(2):1448-1474

In this work, tuning rules of the PID controller have been developed by categorizing a system's response into distinct classes. The classes are formed using the shapes of the test oscillations induced by the system under the Modified Relay Feedback Test (MRFT) produced by specific system models. It is proposed that a physical system can be categorized into one of the proposed classes and thus the tuning rules for a particular class can apply to any kind of system from this class. The idea of producing tuning rules that are based on the shape of the oscillations induced in the loop containing the process comes from the observations that oscillatory responses of physical systems reveal just a few different shapes depending on system dynamics. For applying the developed optimal tuning rules for an arbitrary system, first, certain system characteristics are determined using a priori knowledge of the class model. Then the system's response with the application of the MRFT is examined to classify the oscillation waveform/shape. In this work, such classification is carried out using a cross-correlation algorithm. Finally, a class tuning rules are applied.  相似文献   

Analyzing the role of stakeholders in the adoption of technology integration solutions in UK local government: An exploratory study     

Muhammad Kamal Author VitaeVishanth WeerakkodyAuthor Vitae  Zahir Irani Author Vitae 《Government Information Quarterly》2011,28(2):200-210

Over the last decade many governments across the world have intensified their efforts to improve efficiency of public services through Information and Communication Technology (ICT)-enabled transformation of Local Government Authorities (LGAs). Many of these efforts involve implementing new Information Systems and Technology (IS/IT) and integrating various disparate legacy systems to deliver improved services. While there is a surfeit of literature that have outlined the various organizational and technical challenges posed by Technology Integration Solutions (TIS), few studies have examined the role of stakeholders and surrounding challenges when implementing TIS in LGAs. The TIS adoption process involves several stakeholders, each with specific domain knowledge and expertise that are crucial to the success of TIS projects. In this paper, the authors use the concept of stakeholder theory to analyze the role of stakeholders during the TIS adoption process with regards to their perceptions on the factors influencing TIS adoption in LGAs and their involvement on the adoption lifecycle phases. A qualitative multiple case study approach is adopted to empirically highlight the different categories of stakeholders involved in the TIS adoption process, the dynamic nature and importance of their role, and why their domain knowledge and expertise are vital for TIS projects.  相似文献   

Accumulation of mercury in rice grain and cabbage grown on representative Chinese soils     

Chun-fa Liu  Cheng-xian Wu  Muhammad T. Rafiq  Rukhsanda Aziz  Dan-di Hou  Zhe-li Ding  Zi-wen Lin  Lin-jun Lou  Yuan-yuan Feng  Ting-qiang Li  Xiao-e Yang 《Journal of Zhejiang University. Science. B》2013,14(12):1144-1151

A pot culture experiment was carried out to investigate the accumulation properties of mercury (Hg) in rice grain and cabbage grown in seven soil types (Udic Ferrisols, Mollisol, Periudic Argosols, Latosol, Ustic Cambosols, Calcaric Regosols, and Stagnic Anthrosols) spiked with different concentrations of Hg (CK, 0.25, 0.50, 1.00, 2.00, and 4.00 mg/kg). The results of this study showed that Hg accumulation of plants was significantly affected by soil types. Hg concentration in both rice grain and cabbage increased with soil Hg concentrations, but this increase differed among the seven soils. The stepwise multiple regression analysis showed that pH, Mn(II), particle size distribution, and cation exchange capacity have a close relationship with Hg accumulation in plants, which suggested that physicochemical characteristics of soils can affect the Hg accumulation in rice grain and cabbage. Critical Hg concentrations in seven soils were identified for rice grain and cabbage based on the maximum safe level for daily intake of Hg, dietary habits of the population, and Hg accumulation in plants grown in different soil types. Soil Hg limits for rice grain in Udic Ferrisols, Mollisol, Periudic Argosols, Latosol, Ustic Cambosols, Calcaric Regosols, and Stagnic Anthrosols were 1.10, 2.00, 2.60, 2.78, 1.53, 0.63, and 2.17 mg/kg, respectively, and critical soil Hg levels for cabbage are 0.27, 1.35, 1.80, 1.70, 0.69, 1.68, and 2.60 mg/kg, respectively.  相似文献   

Acceptance of digital library among female students and effects of limited access of digital library on their performance in research work: A case of International Islamic University     

Muhammad Arif  Saima Kanwal 《International Information and Library Review》2013,45(3):122-128

This study investigates the acceptance and importance of digital library among female students of International Islamic University, Islamabad, Pakistan. The study also highlights the problems that are confronted by the female students in completing their research work after limited access to digital library in the female campus of the University.

Survey was administered personally to collect data from 315 female students of eight faculties of the female campus of the university. The convenient sampling technique was used to collect data from the subjects of the study.

The access to digital library is indispensable to the students to complete their research work. With limited access to the digital library the students were unable to meet their information needs from the Internet and the libraries of other universities. The quantity as well as quality of their research work were affected due the restriction of digital resources. Also the limited access affected adversely to improve insight of the respondents regarding technological developments in their respective area of research. The lack of informational literacy program, IT training workshops, IT literate staff and the electricity failure were the main hindrance to access digital library as well as Internet.

This study was limited only to female students of the International Islamic University, Islamabad, Pakistan.  相似文献   

Use of digital media and demand for digitized contents in higher education sector of Pakistan     

Muhammad Rafiq  Kanwal Ameen 《International Information and Library Review》2013,45(3):116-122

The use of digital media is on rise around the world and same phenomenon is emerging in Pakistan. The study was intended to explore the use of digital media and demand for digitized contents in higher education sector of Pakistan. The research questions were answered by a comprehensive literature review along with semi-structured in-depth interviews of 25 library experts. The findings conferred that the use of digital media in higher education is on rise and demand for digitized contents is growing increasingly. The findings of the study made a good case for the libraries to focus more on acquisition of information resources in digital formats as well as initiate digitization initiatives.  相似文献   

Determining the Key Dimensions for Evaluating Service Quality and Satisfaction in Academic Libraries     

Muhammad Jaber Hossain 《International Information and Library Review》2013,45(3):176-189

ABSTRACT

Offering quality services and evaluating the rate of success in providing users with target services is the pervasive importance of academic libraries. The central purpose of this study is to determine key dimensions of service quality and satisfaction through developing a new item-scale for evaluating service quality and satisfaction in academic libraries. For primary data collection the study used a 28-item instrument based on five dimensional modified version of SERVQUAL. Respondents were asked to indicate their degree of opinions in the three-columns format: desired service expectation, minimum service expectation, and perception of service performance on a 7-point Likert-type scale. The researcher initially conducted a pilot survey to clarify the overall structure of the questionnaire items to be accepted and used. The reliability of the analysis of data with distinct service attributes were taken from ten public and private university libraries in Bangladesh. Subjecting data obtained to exploratory factor analysis shows that academic library service quality and satisfaction is related to four basic dimensions: caring, competence, resources, and library as a place. Twenty-six service items were identified after extraction through exploratory factor analysis, where nine items were shown before “caring,” five items for “competence,” seven items for “resources,” and five items for “library as a place.” The result in fact provides a generic and robust instrument and recognizes a new item-scale, namely “real service expectation” for the librarians and information science practitioners in the assessment of service quality and satisfaction in academic libraries and in the related fields.  相似文献   

Electronic information sharing in local government authorities: Factors influencing the decision-making process     

Alinaghi Ziaee Bigdeli  Muhammad Mustafa Kamal  Sergio de Cesare 《International Journal of Information Management》2013

Local Government Authorities (LGAs) are mainly characterised as information-intensive organisations. To satisfy their information requirements, effective information sharing within and among LGAs is necessary. Nevertheless, the dilemma of Inter-Organisational Information Sharing (IOIS) has been regarded as an inevitable issue for the public sector. Despite a decade of active research and practice, the field lacks a comprehensive framework to examine the factors influencing Electronic Information Sharing (EIS) among LGAs. The research presented in this paper contributes towards resolving this problem by developing a conceptual framework of factors influencing EIS in Government-to-Government (G2G) collaboration. By presenting this model, we attempt to clarify that EIS in LGAs is affected by a combination of environmental, organisational, business process, and technological factors and that it should not be scrutinised merely from a technical perspective. To validate the conceptual rationale, multiple case study based research strategy was selected. From an analysis of the empirical data from two case organisations, this paper exemplifies the importance (i.e. prioritisation) of these factors in influencing EIS by utilising the Analytical Hierarchy Process (AHP) technique. The intent herein is to offer LGA decision-makers with a systematic decision-making process in realising the importance (i.e. from most important to least important) of EIS influential factors. This systematic process will also assist LGA decision-makers in better interpreting EIS and its underlying problems. The research reported herein should be of interest to both academics and practitioners who are involved in IOIS, in general, and collaborative e-Government, in particular.  相似文献   

The effects of group stereotypes on adolescents' reasoning about peer retribution     

Pitner RO  Astor RA  Benbenishty R  Haj-Yahia MM  Zeira A 《Child development》2003,74(2):413-425

This study examined the effects of negative group stereotypes on adolescents' reasoning about peer retribution. The sample of adolescents was drawn from central and northern Israel and consisted of 2,604 Arab and Jewish students (ages 13-17; grades 7-11). A quasi-experimental, between-subject design was used, in which the students in each grade were assigned randomly to 1 of 4 peer retribution scenarios. The findings provide evidence that Arab and Jewish students have stereotypes about one another and that in-group bias affected their approval and reasoning about peer retribution only in specific situations. This inquiry provides evidence that it was the number of justifications endorsed within a specific domain that distinguished Arab and Jewish respondents. Theoretical and practical implications are discussed.  相似文献   

Relationship between parenting styles and academic performance of adolescents: mediating role of self-efficacy     

Hamid Masud  Muhammad Shakil Ahmad  Farzand Ali Jan  Ahmad Jamil 《Asia Pacific Education Review》2016,17(1):121-131

The literature supports the importance of parenting styles that are necessary to fulfill the developmental needs of the children and eventually improve their quality of life. Baumrind’s typology of parenting styles was used. There are many studies that examined the relationship of parenting styles (authoritative, authoritarian and permissive parenting styles) and academic performance, but there is lack of measurement of the relationship with respect to Pakistan. Current study analyzed the relationship of parenting styles and academic performance along with self-efficacy as mediating variable. Sample of the study consists of 313 university students from four academic departments. Measures included the parenting styles and self-efficacy. GPA was taken as a measure of academic performance of adolescents. Self-reported questionnaire was used to take the response from students. With the help of structural equation modeling, structural model was tested. Results of the study indicate that parenting styles individually have no significant relationship with the academic performance. In addition to this, self-efficacy only mediates the relationship of authoritative parenting style and academic performance. It can be concluded that self-efficacy in individuals is an important attribute necessary for the psychological development of the adolescents. Self-efficacy enhances the individual’s confidence to progress. There is a need to conduct more research on the relationship of parenting styles and academic performance in Pakistan. Implications for parents, teachers, are discussed.  相似文献   

Anatomy, medical education, and human ancestral variation     

Strkalj G  Spocter MA  Wilkinson AT 《Anatomical sciences education》2011,4(6):362-365

It is argued in this article that the human body both in health and disease cannot be fully understood without adequately accounting for the different levels of human variation. The article focuses on variation due to ancestry, arguing that the inclusion of information pertaining to ancestry in human anatomy teaching materials and courses should be carried out and implemented with care and in line with latest developments in biological anthropology and related sciences. This seems to be of particular importance in the education of health professionals, as recent research suggests that better knowledge of human variation can improve clinical skills. It is also argued that relatively small curricular changes relating to the teaching of human variation can produce significant educational gains.  相似文献