A novel multi-feature model predictive control framework for seismically excited high-rise buildings

Javad Katebi,Afshin Bahrami Rad,Javad Palizvan Zand 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.83 No.4

In this paper, a novel multi-feature model predictive control (MPC) framework with real-time and adaptive performances is proposed for intelligent structural control in which some drawbacks of the algorithm including, complex control rule and non-optimality, are alleviated. Hence, Linear Programming (LP) is utilized to simplify the resulted control rule. Afterward, the Whale Optimization Algorithm (WOA) is applied to the optimal and adaptive tuning of the LP weights independently at each time step. The stochastic control rule is also achieved using Kalman Filter (KF) to handle noisy measurements. The Extreme Learning Machine (ELM) is then adopted to develop a data-driven and real-time control algorithm. The efficiency of the developed algorithm is then demonstrated by numerical simulation of a twenty-story high-rise benchmark building subjected to earthquake excitations. The competency of the proposed method is proven from the aspects of optimality, stochasticity, and adaptivity compared to the KF-based MPC (KMPC) and constrained MPC (CMPC) algorithms in vibration suppression of building structures. The average value for performance indices in the near-field and far-field (El earthquakes demonstrates a reduction up to 38.3% and 32.5% compared with KMPC and CMPC, respectively.

A generalized ANFIS controller for vibration mitigation of uncertain building structure

Javad Palizvan Zanda,Javad Katebi,Saman Yaghmaei-Sabegh 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.87 No.3

A novel combinatorial type-2 adaptive neuro-fuzzy inference system (T2-ANFIS) and robust proportional integral derivative (PID) control framework for intelligent vibration mitigation of uncertain structural system is introduced. The fuzzy logic controllers (FLCs), are designed independently of the mathematical model of the system. The type-1 FLCs, have a limited ability to reduce the effect of uncertainty, due to their fuzzy sets with a crisp degree of membership. In real applications, the consequent part of the fuzzy rules is uncertain. The type-2 FLCs, are robust to the fuzzy rules and the process parameters due to the fuzzy degree of membership functions and footprint of uncertainty (FOU). The adaptivity of the proposed method is provided with the optimum tuning of the parameters using the neural network training algorithms. In our approach, the PID control force is obtained using the generalized type-2 neuro-fuzzy in such a way that the stability and robustness of the controller are guaranteed. The robust performance and stability of the presented framework are demonstrated in a numerical study for an eleven-story seismically-excited building structure combined with an active tuned mass damper (ATMD). The results indicate that the introduced type-2 neuro-fuzzy PID control scheme is effective to attenuate plant states in the presence of the structured and unstructured uncertainties, compared to the conventional, type-1 FLC, type-2 FLC, and type-1 neuro-fuzzy PID controllers.

Nonlinear Buckling Analysis of Cones with Rectangular Cutouts, Numerical and Experimental Investigation

Mohammad Javad Kabiri Renani,Javad Jafari Fesharaki 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.1

In this paper a new regression relation for nonlinear ultimate buckling resistance of the cones with rectangular cutouts is presented. For this purpose, the eff ective geometry parameters and material properties such as the length, thickness, large diameter and angle of the cone, the length, width and location of cutout, the modulus of elasticity, yield stress and plastic properties are considered. Then using response surface method, 288 design of experiment is considered and a regression relation for predict the ultimate buckling resistance is proposed. To validate the results, two types of real experiment are presented and the results show that there is good agreement between the experimental tests and proposed relation. Then the eff ects of changing the various parameters on the ultimate buckling resistance of the cone are investigated. The results show that locating the cutout near the large diameter of the cone has more infl uence than locating near the small diameter. Also, the location of cutout has more infl uence at higher thickness. Also, the yield stress has more infl uence on ultimate buckling resistance at higher values of thickness. In addition, decreasing the length of the cone or increasing the diameter of the cone increase the ultimate buckling resistance and increasing the angle of cone decrease the ultimate buckling resistance of the cone

Effect of Transcutaneous Electrical Nerve Stimulation on the Pain Intensity During Insertion of Needle in Patients Undergoing Spinal Anesthesia: A Randomized Controlled Study

Javad AminiSaman,Hasan A. Karimpour,Behzad Hemmatpour,Saeed Mohammadi,Saeed Darvishi,Rasool Kawyannejad 사단법인약침학회 2020 Journal of Acupuncture & Meridian Studies Vol.13 No.3

Background and objectives: Needle insertion pain during spinal anesthesia is an unpleasant experience for patients. This study aimed to investigate the effects of Transcutaneous Electrical Nerve Stimulation (TENS) on the pain intensity during the insertion of spinal needles in patients undergoing spinal anesthesia. Materials and methods: In a double-blind clinical trial, 60 candidates for elective Trans Ureteral Lithotripsy surgery under spinal anesthesia were randomly divided into intervention and control groups. The electrodes of the TENS device were placed in the space between L3-L4 and L5-S1 vertebrae. The intensity of pain during insertion of the spinal needle by Visual Analog Scale and the frequency of attempts were recorded. Results: The mean age of the study samples was 34.26 ± 5.07 and 32.8 ± 5.28 in the control and intervention group, respectively. The pain intensity during insertion of spinal needles was less significant in the intervention group compared to the control group (p = 0.001). The number of attempts to the spinal needle between the two groups was not statistically significant (p = 0.51). The duration of spinal anesthesia implementation procedure by physician in the intervention group was significantly shorter than that of the control group (p = 0.001). Conclusion: The use of TENS effectively reduced the pain of spinal needle insertion. Considering these beneficial effects, it is suggested that this procedure be used to relive pain in patients with spinal anesthesia.

Vibration analysis of micro composite thin beam based on modified couple stress

Javad Ehyaei,M. Reza Akbarizadeh 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.4

In this article, analytical solution for free vibration of micro composite laminated beam on elastic medium based on modified couple stress are presented. The surrounding elastic medium is modeled as the Winkler elastic foundation. The governing equations and boundary conditions are obtained by using the principle of minimum potential energy for Euler- Bernoulli beam. For investigating the effect of different parameters including material length scale, beam thickness, some numerical results on different cross ply laminated beams such as (90,0,90), (0,90,0), (90,90,90) and (0,0,0) are presented on elastic medium. Free vibration analysis of a simply supported beam is considered utilizing the Fourier series. Also, the fundamental frequency is obtained using the principle of Hamilton for four types of cross ply laminations with hinged-hinged boundary conditions and different beam theories. The fundamental frequency for different thin beam theories are investigated by increasing the slenderness ratio and various foundation coefficients. The results prove that the modified couple stress theory increases the natural frequency under the various foundation for free vibration of composite laminated micro beams.

The Alkali Metal Interactions with MgO Nanotubes

Javad Beheshtian,Ali Ahmadi Peyghan,Zargham Bagheri,M. Kamfiroozi 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.6

Adsorption of alkali metals (Li, Na, and K) on the surface of magnesium oxide nanotubes (MgONTs) with different diameters was investigated using density functional theory. According to the obtained results, the most stable adsorption site was found to be atop the oxygen atom of the tube surface with adsorption energies in the range of −0.25 to −0.74 eV. HOMO-LUMO gap (Eg) of the tubes dramatically decreases upon the adsorption of the alkali metals, resulting in enhancement of their electrical conductivity enhancement. The order of Eg decrement caused by the metal adsorption is as follows: K > Na > Li. The results suggest that the MgONTs were transformed from semi-insulator to semiconductor upon the alkali metal adsorption. Increasing the tube diameter, the HOMO/LUMO gap of the pristine tube is enhanced and adsorption energies of the alkali metals are decreased.

EFL Teachers’ Perceptions of the Concept of Working Memory and its Trainability

Javad Alipour,Maryam Osivand 아시아영어교육학회 2020 The Journal of Asia TEFL Vol.17 No.3

CuI Nanoparticles as New, Efficient and Reusable Catalyst for the One-pot Synthesis of 1,4-Dihydropyridines

Javad Safaei-Ghomi,Abolfazl Ziarati,Raheleh Teymuri 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.8

A simple one-pot synthesis of two derivatives of 1,4-dihydropyridines has been described under reflux conditions using copper iodide nanoparticles (CuI NPs) as a catalyst in high yields. This method demonstrated four-component coupling reactions of aldehydes and ammonium acetate via two pathways. In one route, the reaction was performed using 2 eq ethyl acetoacetate while in the other one 1 eq ethyl acetoacetate and 1 eq malononitrile were used. The CuI NPs was reused and recycled without any loss of activity and product yield. It is noteworthy to state that wide range of the 1,4-dihydropyridines have attracted large interest due to pharmacological and biological activities.

Introduction of the Most Suitable Culture Media for Micropropagation of a Medicinal Plant Aloe (Aloe barbadensis Mill.)

Javad Fattahi Moghadam,Yousef Hamidoghli,Reza Fotouhi Ghazvini 한국원예학회 2006 한국원예학회 기타간행물 Vol.- No.-

Evaluation of Genetic Diversity among Some Genotypes of Kentucky Bluegrass by RAPD Molecular Markers

Javad Rezapour Fard,Zabihollah Zamani,Mohamad Reza Fattahi Moghaddam,Mohsen Kafi 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.4

Genetic improvement of plants need a high genetic diversity and molecular markers offer a powerful tool for its assessment. Poa pratensis has extensive divergence in natural old turfs and pastures in temperate zones of Iran,being useful for breeding programs. In this research, RAPD markers were used to study the genetic diversity of 19turfgrass genotypes (including 16 genotypes of Poa pratensis along with one genotype from each of Lolium perenne,Cynodon dactylon and Festuca arundinacea species). After screening 100 random 10-mer RAPD primers, 17 primers were selected based on the clarity of their amplified fragments in PCR and the high reproducibility for scoring. From the 284 produced bands, 281 were polymorphic. Cluster analysis of RAPD data was performed using the UPGMA method based on Jaccard's similarity coefficients. Dendrogram at a similarity of 0.24 gave 5 main clusters. The correlation coefficient between the data matrix and the cophenetic matrix of cluster data was high (r = 0.99), indicating that the clustering dendrogram being highly fitted to similarity matrix. A relatively high genetic similarity was observed between some commercial cultivars and Iranian local genotypes. In addition, this research showed the high genetic diversity among studied genotypes as well as the high efficiency of RAPD markers for evaluation of genetic diversity among turfgrasses.