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Safa Maraoui Abdelkader Krifa Kais Bouzrara 《Journal of The Franklin Institute》2019,356(12):6226-6254
This paper is devoted to the issue of a robust predictive control for linear discrete-time systems by using Meixner-like model. The Meixner-like functions are an extension of Laguerre functions and convenient when the system has a slow start or delay. To ensure the reduction of the parameter number in the Meixner-like model, the optimization of parameters characterizing the Meixner-like functions is proposed. This proposed robust predictive control copes with physical constraints and geometrical constraints due to parameter uncertainties, which are estimated by using the Unknown But Bounded Error (UBBE) approach, and leads to the min-max optimization problem. 相似文献
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David Berdik Safa Otoum Nikolas Schmidt Dylan Porter Yaser Jararweh 《Information processing & management》2021,58(1):102397
Blockchain technologies have grown in prominence in recent years, with many experts citing the potential applications of the technology in regard to different aspects of any industry, market, agency, or governmental organizations. In the brief history of blockchain, an incredible number of achievements have been made regarding how blockchain can be utilized and the impacts it might have on several industries. The sheer number and complexity of these aspects can make it difficult to address blockchain potentials and complexities, especially when trying to address its purpose and fitness for a specific task. In this survey, we provide a comprehensive review of applying blockchain as a service for applications within today’s information systems. The survey gives the reader a deeper perspective on how blockchain helps to secure and manage today information systems. The survey contains a comprehensive reporting on different instances of blockchain studies and applications proposed by the research community and their respective impacts on blockchain and its use across other applications or scenarios. Some of the most important findings this survey highlights include the fact that blockchain’s structure and modern cloud- and edge-computing paradigms are crucial in enabling a widespread adaption and development of blockchain technologies for new players in today unprecedented vibrant global market. Ensuring that blockchain is widely available through public and open-source code libraries and tools will help to ensure that the full potential of the technology is reached and that further developments can be made concerning the long-term goals of blockchain enthusiasts. 相似文献
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Drawing on sociocultural theory, and a large number of empirical studies conducted on the effectiveness of scaffolding on second or foreign language learning, the authors investigated the application of different forms of scaffolding to improve listening comprehension of the Iranian intermediate English as a foreign language (EFL) learners. To this end, 90 intermediate EFL learners were randomly assigned to 2 experimental groups and a control group. During 15 treatment sessions of listening comprehension instruction, expert peers in the first experimental group assisted their less knowledgeable peers in their listening comprehension tasks. The participants in the second experimental group were asked to assist their coequal peers while doing the listening comprehension tasks, but the participants in group 3 did not interact with each other or even their teacher and no scaffolding scheme was used when they were doing the listening comprehension tasks. One-way analysis of variance and post hoc analyses revealed that the expert peers' scaffolding was the most effective procedure for the intermediate EFL learners' listening comprehension development. Furthermore, coequal peers' scaffolding was proved to be the second effective procedure for the listening comprehension improvement. The findings underscore the relative efficacy of different forms of scaffolding procedure and the superiority of the expert peers' scaffolding over coequals' scaffolding. The qualitative analysis of the recorded data indicated that the implicit scaffolding strategies were more frequently used by the expert peers. However, the explicit scaffolding strategies were more frequently used to by the coequals. The findings of the study underscore the positive potentiality of scaffolding in its different forms for the EFL learners' listening comprehension development. 相似文献
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This study investigated ethnic-racial identity (ERI) developmental processes (i.e., exploration and resolution) as pathways for adolescents to develop global bicultural competence, or the ability to meet heritage and host cultural demands. The sample included 749 U.S. Mexican-origin youth (30% Mexico-born; 51% male) followed from early-to-late adolescence (Mage = 12.79–17.38 years). Longitudinal structural equation analyses revealed that youth’s sequential engagement in ERI exploration and resolution (from early-to-middle adolescence) promoted global bicultural competence in late adolescence. The findings highlight the benefits of achieving clarity about one’s ERI via self-exploration efforts for adolescents’ ability to respond effectively to bicultural demands. This study advances mechanisms via which ERI development may support youth adaptation to multiple cultural systems. 相似文献
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We investigated Iranian secondary-school English teachers’ interpersonal behaviour with a validated culturally-adaptive Iranian version of the Questionnaire on Teacher Interaction. Data were collected from 971 Iranian secondary-school students (398 students participated in the pilot study and 573 students in the main study) and 55 Iranian secondary-school English teachers (23 teachers participated in the pilot study and 32 in the main study). The construction of the instrument started with an open-ended questionnaire followed by semi-structured interviews to prepare items for the questionnaire. Next, expert judgement, pilot administration of the questionnaire and statistical analyses ensured its reliability and construct validity before final administration of the questionnaire to the main participants followed. The study supported the validity and reliability of the questionnaire and confirmed its usability in the Iranian secondary-school context. Furthermore, the results indicated that the students perceived their English teachers as being Tolerant and Authoritative, showing higher degrees of friendship, leadership and understanding behaviour and relatively low levels of uncertain and dissatisfied behaviour. The results showed a discrepancy between students’ perceptions of actual and ideal teacher interpersonal behaviour. Also students’ perceptions of their actual teachers’ interpersonal behaviour were significantly different from those of the teachers’ self-perceptions. One important implication of this study is that the QTI can be used in secondary-school contexts as a valuable feedback instrument to encourage teachers to reflect on their performance and improve their interpersonal behaviour as a part of their professional development. 相似文献
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