H∞ dynamic observer-based fuzzy integral sliding mode control with input magnitude and rate constraints     

Zeinab Echreshavi  Mokhtar Shasadeghi  Mohammad Hassan Asemani 《Journal of The Franklin Institute》2021,358(1):575-605

This paper focuses on a systematic constrained fuzzy integral sliding mode controller design for a class of uncertain discrete-time nonlinear systems which can be represented as Takagi-Sugeno (T-S) fuzzy models. The contributions are to consider constraints on the control input amplitude and control input amplitude rate and to extend the existing pole-placement design technique for designing gain matrices of the fuzzy sliding surface. Moreover, a dynamic-gain observer along with ${\mathit{H}}_{\infty }$ performance is proposed for attenuating disturbance, which generalizes the existing results on the Proportional Observer (PO), the Proportional Integral Observer (PIO) and the dynamic observer (DO). Finally, the dynamic-observer-based constrained fuzzy integral sliding mode controller is designed. All the proposed design conditions are represented in terms of LMIs-based ones. The methods are studied for not only single-input single-output (SISO) but also multi-input multi-output (MIMO) systems. In the end, the proposed approaches are evaluated on practical and numerical systems to illustrate the superiority of the proposed control scheme.  相似文献   

Perspectives of University Students and Faculty on remote education experiences during COVID-19- a qualitative study     

Khan  Sarah  Kambris  Mona El Kouatly  Alfalahi  Hamda 《Education and Information Technologies》2022,27(3):4141-4169

Education and Information Technologies - Owing to COVID-19 the Ministry of Education in the United Arab Emirates mandated educational institutions to shift to remote learning. In this study the...  相似文献   

Game-based learning platform to enhance cybersecurity education     

Khan  Manzoor Ahmed  Merabet  Adel  Alkaabi  Shamma  Sayed  Hesham El 《Education and Information Technologies》2022,27(4):5153-5177

Education and Information Technologies - Computer security competitions have been playing a significant role in encouraging students to get into cybersecurity, as well as enhancing the...  相似文献   

Language planning in Malaysia： The first hundred years     

Abdulah Hassan 《通化师范学院学报》2006,(7):38-44

The past,present and prospects of a linguistic range that includes Malay,Mandarin,Tamil,and English [A version,adapted for ET,of the opening address to the conference‘Congress of the world's major languages,’held under the auspices of the Dewan Bahasa dan Pustaka(‘Lan- guage and Literacy Agency’),in Kuala Lumpur,Malaysia,5- 8 October 2004]  相似文献   

Growth and yield of rice as affected by transplanting dates and seedlings per hill under high temperature of Dera Ismail Khan, Pakistan     

Baloch MS  Awan IU  Hassan G 《Journal of Zhejiang University. Science. B》2006,7(7):572-579

Studies were initiated for two consecutive years to find out the effect of time of transplanting and seedlings hill^-l on the productivity of rice in Dera Ismail Khan district of North West Frontier Province （NWFP）, Pakistan. The experiment was laid out in a randomized complete block design with split plot arrangements. Main plots consisted of four transplanting dates viz. 20th and 27th of June and 4th and 1 lth of July while sub-plots contained 1, 2, 3 or 4 seedlings hill^-1. Among transplanting dates, June 20th planted crop gave highest paddy yield and net return with I seedling hill^-1. It explains that the use of more seedlings hill^-1 not only adds to cost but is also a mere wastage of natural resources. Based on research findings, we conclude that the use of I seedling hill^-1 is most appropriate for timely sowing otherwise 4 seedlings hill^-1 should be used to compensate for the yield gap in late transplanted rice.  相似文献   

A review of health and access to health information in Bhutan     

Glover SW  Dema R  Yangzon P  Sonam K  Gleghorn C 《Health information and libraries journal》2006,23(4):290-293

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The impetus for organisational change: An exploration     

Elaine El‐Khawas 《Tertiary Education and Management》2013,19(1):37-46

Abstract

This paper examines the factors that cause universities to undertake academic change, specifically, changes to achieve more effective teaching and learning. Based on an analysis of 30 reform‐oriented US colleges and universities, it suggests that universities respond to diverse environmental pressures, not solely to external mandates. There is evidence, too, that internal forces within universities can be an impetus for change.  相似文献   

Urban transportation network analysis from a thermodynamic perspective     

Mohamad Sleiman  Rachid Bouyekhf  Adbellah El Moudni 《Journal of The Franklin Institute》2019,356(1):351-381

The paper explores the application of thermodynamic formalism to model and control transportation networks. Specifically, by considering the vehicles as the abstract energy supplied to the system, we show in certain circumstances that certain thermodynamic concepts such as temperature, thermal capacity and thermal equilibrium can have the corresponding notions in transportation context. In addition, despite the lack of a natural principle in transportation context that corresponds to the second law of thermodynamic as we will show, the most important thermodynamic notion, which is the entropy, can be also defined in order to measure the disorder of transportation systems. It is then shown that the state when all lanes have the same occupancy corresponds to the thermal equilibrium arising in isolated thermodynamic system. This equilibrium occupancy leads to a minimum entropy corresponding to a minimal disorder. Besides, by taking the transportation entropy as the storage function, a robust dissipativity based control strategy is presented to reduce the disorder and render the system better organized. Finally, an example is worked out to illustrate the results.  相似文献   

Decay of softwood in archaeological wooden artifacts     

Nesrin M. N. El Hadidi 《文物保护研究》2017,62(2):83-95

Hardwoods and softwoods were used side by side throughout Egyptian history, and importing softwoods that had an attractive color and texture was common. Over the decades, artifacts based on hardwoods and softwoods underwent deterioration phenomena, sometimes reaching either a level of brittleness or turning into a wood powder that may easily crumble. These levels of decay/degradation are often difficult to handle in terms of conservation treatments. To study or identify the reasons for decay has always been a point of interest for conservation purposes, but to assess decay and choose an appropriate treatment according to the state of preservation for the sake of keeping an artifact intact has become a subject of major importance. It is difficult at times to understand the deterioration process, because hardwoods and softwoods are different in structure, properties, and chemical composition. For this preliminary study, decayed samples from three commonly used softwood types, cypress (Cupressus sp.), cedar (Cedrus sp.), and pine (Pinus sp.), were identified and chosen. Scanning electron microscopy (SEM) of the samples indicated the degree of decay. Decayed and non-aged samples of the same wood type were analyzed using Fourier transform infrared spectroscopy (FTIR), and all the major carbohydrate and lignin bands were recorded. The strong hydrogen bonded (O–H) stretching absorption associated with water linked by hydrogen bonds to the –OH groups of cellulose and hemicelluloses in all decayed samples increased with decay. The brown powdery, fragile samples that had been evidently affected by microbial decay had a higher amount of lignin. The lignin/carbohydrate ratio was calculated and results compared. The increase of either lignin percentage or extractives in some of the samples had caused a darkening of color in both cypress and cedar samples, but the pine sample did not have the same texture and appearance. In cases where the lignin percentage decreased the samples had changed to a slightly lighter color. FTIR results explained the decay phenomena observed in SEM micrographs and helped assess wood decay and also confirmed results that had been previously obtained while applying traditional chemical analysis on wood.  相似文献   

Temperamental Shyness,Frontal EEG Theta/Beta Ratio,and Social Anxiety in Children     

Kristie L. Poole  Raha Hassan  Louis A. Schmidt 《Child development》2021,92(5):2006-2019

The authors examined how children’s frontal electroencephalogram (EEG) theta/beta ratio—an index of neurocognitive control—changed from baseline to a social stressor, and whether these EEG changes moderated the relation between temperament and anxiety. Children (N = 152; M_age = 7.82 years, 52% male, 81% White) had their EEG recorded during a baseline and speech anticipation condition. Children’s frontal theta/beta ratio decreased from baseline to speech anticipation, and this baseline-to-task change moderated the relation between temperamental shyness and social anxiety. Temperamental shyness was related to higher state and trait social anxiety only among children with large baseline-to-task decreases in theta/beta ratio. Findings are consistent with theoretical models hypothesizing that temperamentally shy children with heightened neurocognitive control may be at greater risk for anxiety.  相似文献