Robust fuzzy stabilization of hybrid discrete delay T–S systems     

Magdi S. Mahmoud 《Journal of The Franklin Institute》2018,355(2):625-652

Novel results on robust fuzzy stabilization are developed hereafter for discrete hybrid systems in the (T–S) fuzzy framework. The systems are subject to fractional parametric uncertainties and bounded time-delays. Linear matrix inequalities-based conditions are derived for stability analysis. By optimizing an appropriate performance measure, both stabilizing gains and the switching signal are generated. The analytical findings are validated on a typical water-quality system application to demonstrate the efficacy of the developed techniques.  相似文献   

New methods for compression of MP double array by compact management of suffixes     

Tshering C. Dorji  El-sayed Atlam  Susumu Yata  Mahmoud Rokaya  Masao Fuketa  Kazuhiro Morita  Jun-ichi Aoe 《Information processing & management》2010

Minimal Prefix (MP) double array is an efficient data structure for a trie. However, its space efficiency is degraded by the non-compact management of suffixes. This paper presents three methods to compress the MP double array. The first two methods compress the MP double array by accommodating short suffixes inside the leaf nodes, and pruning leaf nodes corresponding to the end marker symbol. These methods achieve size reduction of up to 20%, making insertion and deletion faster at the same time while maintaining the retrieval time of O(1). The third method eliminates empty spaces in the array that holds suffixes, and improves the maximum size reduction further by about 5% at the cost of increased insertion time. Compared to a Ternary Search Tree, the key retrieval of the compressed MP double array is 50% faster and its size is 3–5 times smaller.  相似文献   

Tracking policies for a class of dynamic production-inventory systems     

Magdi S. Mahmoud  Umar M. Al-Turki 《Journal of The Franklin Institute》2010,347(9):1689-1703

In this paper, new results are established for generating tracking policies in aggregated production-inventory systems. A dynamic model is developed to characterize the evolution of targeted production, inventory and demand over time and incorporates the inventory, production and demand tracking errors as additional variables. The control variables are managerial decision variables on rate of production and advertisement. The developed model takes the form of linear system with time-varying delay. Tracking policies are then formulated and determined to ensure that the production-inventory tracking model achieves a desirable performance in terms of H_∞-measure. Numerical simulation is performed to illustrate the theoretical developments.  相似文献   

Improved exponential stability analysis for delayed recurrent neural networks   总被引：1，自引：0，他引：1  

Magdi S. Mahmoud  Yuanqing Xia 《Journal of The Franklin Institute》2011,348(2):201-211

In this paper, we investigate the problem of global exponential stability analysis for a class of delayed recurrent neural networks. This class includes Hopfield neural networks and cellular neural networks with interval time-delays. Improved exponential stability condition is derived by employing new Lyapunov-Krasovskii functional and the integral inequality. The developed stability criteria are delay dependent and characterized by linear matrix inequalities (LMIs). The developed results are less conservative than previous published ones in the literature, which are illustrated by representative numerical examples.  相似文献   

Modeling, simulation, and applied optimization     

Mohamed El-Tarhuni  Jamal A. Abdalla  Ibrahim Sadek  Ismail Kucuk  Mahmoud Anabtawi  Mohammad Al-Jarrah 《Journal of The Franklin Institute》2011,348(7):1161-1162

  相似文献   

Decentralized H∞ controller design for a multi-zone space heating system     

Magdi S. Mahmoud  M. Masood Hussain 《Journal of The Franklin Institute》2013,350(10):3064-3081

  相似文献   

Enhancing Aspect-Based Sentiment Analysis of Arabic Hotels’ reviews using morphological,syntactic and semantic features     

Mohammad Al-Smadi  Mahmoud Al-Ayyoub  Yaser Jararweh  Omar Qawasmeh 《Information processing & management》2019,56(2):308-319

This research presents an enhanced approach for Aspect-Based Sentiment Analysis (ABSA) of Hotels’ Arabic reviews using supervised machine learning. The proposed approach employs a state-of-the-art research of training a set of classifiers with morphological, syntactic, and semantic features to address the research tasks namely: (a) T1:Aspect Category Identification, (b) T2:Opinion Target Expression (OTE) Extraction, and (c) T3: Sentiment Polarity Identification. Employed classifiers include Naïve Bayes, Bayes Networks, Decision Tree, K-Nearest Neighbor (K-NN), and Support-Vector Machine (SVM).The approach was evaluated using a reference dataset based on Semantic Evaluation 2016 workshop (SemEval-2016: Task-5). Results show that the supervised learning approach outperforms related work evaluated using the same dataset. More precisely, evaluation results show that all classifiers in the proposed approach outperform the baseline approach, and the overall enhancement for the best performing classifier (SVM) is around 53% for T1, around 59% for T2, and around 19% in T3.  相似文献   

Revisiting perceived service quality in higher education: uncovering service quality dimensions for postgraduate students     

Shahira El Alfy  Abdulai Abukari 《Journal of Marketing for HIGHER EDUCATION》2020,30(1):1-25

ABSTRACT

Perceived service quality in higher education and its antecedents have been one of the significant issues worldwide. Despite being studied over decades, service quality (SQ) remains a crucial area of research due to its dynamic and contextual nature, among other reasons. The main research objective is to uncover the dimensions constituting SQ from the perspectives of postgraduate students and university staff to provide a better understanding of key elements of the SQ. The current research incorporated relevant theories and concepts from both marketing and higher education literature and employed in-depth interviews with students and staff for data collection. Interviewees’ insights were analyzed using content analysis. A conceptual model is developed to explain the suggested relationship among study variables. Based on qualitative data analysis, four dimensions of SQ emerged, namely academic services, academic facilities, administrative services, and students’ service role. Additionally, performance and employee orientation are found to affect SQ. Research findings can guide education managers and academicians to consider students’ service role as an integral dimension of SQ and find new ways to improve it.  相似文献   

Modern standard Arabic speech corpus for implementing and evaluating automatic continuous speech recognition systems     

Mohammad Abd-Alrahman Mahmoud Abushariah  Raja Noor Ainon  Roziati Zainuddin  Assal Ali Mustafa Alqudah  Moustafa Elshafei Ahmed  Othman Omran Khalifa 《Journal of The Franklin Institute》2012,349(7):2215-2242

This paper presents our work towards developing a new speech corpus for Modern Standard Arabic (MSA), which can be used for implementing and evaluating Arabic speaker-independent, large vocabulary, automatic, and continuous speech recognition systems. The speech corpus was recorded by 40 (20 male and 20 female) Arabic native speakers from 11 countries representing three major regions (Levant, Gulf, and Africa). Three development phases were conducted based on the size of training data, Gaussian mixture distributions, and tied states (senones). Based on our third development phase using 11 hours of training speech data, the acoustic model is composed of 16 Gaussian mixture distributions and the state distributions tied to 300 senones. Using three different data sets, the third development phase obtained 94.32% and 8.10% average word recognition correctness rate and average Word Error Rate (WER), respectively, for same speakers with different sentences (testing sentences). For different speakers with same sentences (training sentences), this work obtained 98.10% and 2.67% average word recognition correctness rate and average WER, respectively, whereas for different speakers with different sentences (testing sentences) this work obtained 93.73% and 8.75% average word recognition correctness rate and average WER, respectively.  相似文献   

Adaptive anti-lag synchronization of two identical or non-identical hyperchaotic complex nonlinear systems with uncertain parameters     

Emad E. Mahmoud 《Journal of The Franklin Institute》2012,349(3):1247-1266

In this paper we present the adaptive anti-lag synchronization (ALS) of two identical or non-identical hyperchaotic complex nonlinear systems with uncertain parameters. The concept of ALS is not detected yet in the literature. Based on the Lyapunov function a scheme is designed to achieve ALS of hyperchaotic attractors of these systems. The ALS of two identical complex Lü systems and two different hyperchaotic complex Lorenz and Lü systems are taken as two examples to verify the feasibility of the presented scheme. These hyperchaotic complex systems appear in several applications in physics, engineering and other applied sciences. Numerical simulations are calculated to demonstrate the effectiveness of the proposed synchronization scheme and verify the theoretical results.  相似文献