Optimization of fuzzy model using genetic algorithm for process control application     

Rubiyah Yusof  Ribhan Zafira Abdul Rahman  Marzuki Khalid  Mohd Faisal Ibrahim 《Journal of The Franklin Institute》2011,348(7):1717-1737

A technique for the modeling of nonlinear control processes using fuzzy modeling approach based on the Takagi-Sugeno fuzzy model with a combination of genetic algorithm and recursive least square is proposed. This paper discusses the identification of the parameters at the antecedent and consequent parts of the fuzzy model. For the antecedent fuzzy parameters, genetic algorithm is used to tune them while at the consequent part, recursive least squares approach is used to identify the system parameters. This approach is applied to a process control rig with three subsystems: a heating element, a heat exchanger and a compartment tank. Experimental results show that the proposed approach provides better modeling when compared with Takagi Sugeno fuzzy modeling technique and the linear modeling approach.  相似文献   

花状氧化铁的制备及其在废水处理中的应用     

Kun XIE  ;Xiang-xue WANG  ;Zheng-jie LIU  ;Ahmed ALSAEDI  ;Tasawar HAYAT  ;Xiang-ke WANG 《浙江大学学报(A卷英文版)》2014,15(8):671-680

研究目的：研究花状氧化铁的制备并探讨其对砷的吸附性能和亚甲基蓝的催化性能。 创新要点：1.合成了花状氧化铁;2.发现Langmuir模型能更好地模拟砷的吸附过程;3.发现花状氧化铁对亚甲基蓝有很好的催化降解性能。 研究方法：1.使用扫描电镜、投射电镜、X射线衍射和BET比表面及孔径分析仪对合成的花状氧化铁进行表征;2.采用静态实验法研究砷的吸附性能及亚甲基蓝的催化行为。 重要结论：1.采用一种低成本的溶剂热法合成了花状氧化铁;2.合成的花状氧化铁有着较大的比表面积并对砷有着很好的吸附性能,并且吸附率随着pH的增加而降低。同时发现Langmuir模型能更好地模拟砷的吸附过程;3.亚甲基蓝的初始浓度和花状氧化铁的用量对催化性能影响较为明显,花状氧化铁有较好的重复利用性;4.合成的花状氧化铁可以应用于大批废水的处理。  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   

World Bank assistance in education     

Manzoor Ahmed 《Prospects》1981,11(1):25-35

  相似文献   

Book reviews     

Ahmed Moatassime  Alejandro Dorna 《Prospects》1984,14(1):164-168

  相似文献   

Science in the Indian Universities     

Rais Ahmed  Madhulika Rakesh 《Minerva》1992,30(1):51-61

  相似文献   

Factors affecting attitudes and intentions towards knowledge sharing in the Dubai Police Force     

Ibrahim Seba  Jennifer Rowley  Sian Lambert 《International Journal of Information Management》2012

This study contributes to the limited research base on knowledge sharing in public sector organisations, specifically police forces, and organisations in the Middle East through a case study investigation into the factors that affect knowledge sharing in the Dubai Police Force. A questionnaire-based survey was conducted with staff in key departments in the Dubai Police Force. Informed by the literature and by interviews conducted in a previous phase, the core of the questionnaire was a bank of Likert-style questions covering the dependent variables intention to knowledge share, and attitude towards knowledge sharing, and the independent variables, trust, organisational structure, leadership, reward, time, and information technology. Data was analysed using structured equation modelling, in order to test the measurement model using confirmatory factor analysis, and to test the structural model. The structural model suggests a strong relationship between attitude to knowledge sharing, and intention to share knowledge. Hypotheses regarding the influence of leadership, trust, organisational structure, time, and information technology on attitude to knowledge sharing were upheld. Rewards did not to influence attitude to knowledge sharing. Recommendations are offered for practice and further research.  相似文献   

Negotiating Academic Learning and Research: The Spiritual Praxis of Graduate Students of Color     

Riyad Ahmed Shahjahan  Lara Barker 《Equity & Excellence in Education》2013,46(4):456-472

Drawing on data collected in a qualitative study of racially minoritized faculty members, this article examines the challenges these faculty members faced in bringing different aspects of their spirituality into their scholarly work as graduate students. This article explores the questions: How do racially minoritized graduate students negotiate their spiritual identities and integrate their spiritual epistemologies and cultural knowledge into academic practices, and what challenges do they face in doing both? This article presents three salient themes: sacred subjectivity in student-focused research, spiritual praxis in the classroom, and new visions for inclusive spiritual expression in the academy. By focusing our analysis on study participants' strategies for resisting pressures to closet their beliefs, this article affirms the importance of legitimizing the spiritual epistemological perspectives of racially minoritized graduate students in creating a more equitable and diverse higher education culture.  相似文献   

Lag projective synchronization of fractional-order delayed chaotic systems     

Weiwei Zhang  Jinde Cao  Ranchao Wu  Fuad E. Alsaadi  Ahmed Alsaedi 《Journal of The Franklin Institute》2019,356(3):1522-1534

This paper considers the lag projective synchronization of fractional-order delayed chaotic systems. The lag projective synchronization is achieved through the use of comparison principle of linear fractional equation at the presence of time delay. Some sufficient conditions are obtained via a suitable controller. The results show that the slave system can synchronize the past state of the driver up to a scaling factor. Finally, two different structural fractional order delayed chaotic systems are considered in order to examine the effectiveness of the lag projective synchronization. Feasibility of the proposed method is validated through numerical simulations.  相似文献   

Stabilization of artificial gas-lift process using nonlinear predictive generalized minimum variance control     

Jing Shi  Ahmed Al-Durra  Rachid Errouissi  Igor Boiko 《Journal of The Franklin Institute》2019,356(4):2031-2059

Artificial gas-lift (AGL) is one of the most widely used methods in oil production to maintain acceptable oil flow to the processing equipment and sales when the reservoir pressure is not high enough. In spite of its popularity, the AGL process is prone to casing-heading instability, which is revealed as significant flow oscillation. This is undesirable as it results in production losses and unstable behavior that has negative impact on the downstream equipment. Controller design for such a process is very challenging as it exhibits highly nonlinear dynamics. In this work, the predictive generalized minimum variance control (NPGMV) is employed to derive a robust controller based on the state estimation to stabilize AGL process when casing-heading phenomenon occurs. A closed-form optimal control law is obtained based on the Taylor series approximation. Further, a nonlinear state observer is produced and combined with the controller to ensure closed-loop control through variables that are most beneficial to the system performance, which are unmeasurable and can be obtained only via estimation. Through simulation studies, the effectiveness of the proposed controller is demonstrated.  相似文献