Practical use of computational building information modeling in repairing and maintenance of hospital building- case study

Majid Reza Akhoundan,Kia Khademi,Sam Bahmanoo,Karzan Wakil,Edy Tonnizam Mohamad,Majid Khorami 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.5

Computational Building Information Modeling (BIM) is an intelligent 3D model-based process that provides architecture, engineering, and construction professionals the insight to plan, design, construct, and manage buildings and infrastructure more efficiently. This paper aims at using BIM in Hospitals configurations protection. Infrastructure projects are classified as huge structural projects taking advantage of many resources such as finance, materials, human labor, facilities and time. Immense expenses in infrastructure programs should be allocated to estimating the expected results of these arrangements in domestic economy. Hence, the significance of feasibility studies is inevitable in project construction, in this way the necessity in promoting the strategies and using global contemporary technologies in the process of construction maintenance cannot be neglected. This paper aims at using the building information modeling in covering Imam Khomeini Hospital’s equipment. First, the relationship between hospital constructions maintenance and repairing, using the building information modeling, is demonstrated. Then, using library studies, the effective factors of constructions’ repairing and maintenance were collected. Finally, the possibilities of adding these factors in Revit software, as one of the most applicable software within BIM is investigated and have been identified in some items, where either this software can enter or the software for supporting the repairing and maintenance phase lacks them. The results clearly indicated that the required graphical factors in construction information modeling can be identified and applied successfully.

Practical use of computational building information modeling in repairing and maintenance of hospital building- case study

Akhoundan, Majid Reza,Khademi, Kia,Bahmanoo, Sam,Wakil, Karzan,Mohamad, Edy Tonnizam,Khorami, Majid Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.5

Computational Building Information Modeling (BIM) is an intelligent 3D model-based process that provides architecture, engineering, and construction professionals the insight to plan, design, construct, and manage buildings and infrastructure more efficiently. This paper aims at using BIM in Hospitals configurations protection. Infrastructure projects are classified as huge structural projects taking advantage of many resources such as finance, materials, human labor, facilities and time. Immense expenses in infrastructure programs should be allocated to estimating the expected results of these arrangements in domestic economy. Hence, the significance of feasibility studies is inevitable in project construction, in this way the necessity in promoting the strategies and using global contemporary technologies in the process of construction maintenance cannot be neglected. This paper aims at using the building information modeling in covering Imam Khomeini Hospital's equipment. First, the relationship between hospital constructions maintenance and repairing, using the building information modeling, is demonstrated. Then, using library studies, the effective factors of constructions' repairing and maintenance were collected. Finally, the possibilities of adding these factors in Revit software, as one of the most applicable software within BIM is investigated and have been identified in some items, where either this software can enter or the software for supporting the repairing and maintenance phase lacks them. The results clearly indicated that the required graphical factors in construction information modeling can be identified and applied successfully.

Triple Tooth AlGaN/GaN HEMT on SiC Substrate: A Novel Structure for High-Power Applications

Majid Ghaffari,Ali A. Orouji,Mojtaba Valinataj 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.12

In this paper, a AlGaN/AlN/GaN/SiC High Electron Mobility Transistor (HEMT) to reduce the electric field is suggested. The main idea of this work is to improve the Direct Current (DC) and Radio Frequency (RF) properties of device by modifying the depletion region in the channel. The proposed structure consists of a floating metal like a comb with triple tooth which is located in the space between the gate and drain and inside the buffer layer. We called the proposed structure as triple tooth HEMT (TT-HEMT). The RF and DC characteristics of the proposed structure are studied using numerical simulations. The breakdown voltage (VBR) increases to 169.5 V for the proposed structure in comparison with 103 V for the conventional HEMT (C-HEMT) due to the modified electric field distribution in the channel of the TT-HEMT structure. The maximum output power density (Pmax) of the TT-HEMT structure is 60.4% greater than that of the C-HEMT. The optimized results show that the maximum oscillation frequency (fmax) and cut-off frequency (fT ) of the proposed structure improve 111% and 26.5%, respectively compared to the C-HEMT structure. In addition, the maximum available gain (MAG) of the TT-HEMT structure is obtained 8.5 dB higher than that of the C-HEMT structure at the frequency of 40 GHz. The optimal results show that whatever the number of teeth on metal increases, the depletion region in the channel is modified more and the breakdown voltage increases, as well. Besides, the output power density (Pmax) is improved with the increasing number of teeth on metal (N). This characteristic is also true, for the cut-off frequency (fT ), the maximum oscillation frequency (fmax) and the maximum available gain (MAG) of the proposed structure. However, the drain current (ID) of the proposed structure is reduced.

Experimental investigation into brick masonry arches’ (vault and rib cover) behavior reinforced by FRP strips under vertical load

Majid Reza Takbash,Abbas Ali Akbarzadeh Morshedi,Seyyed Ali Sabet 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.5

The current experimental study is the reinforcement of the simple curvature vault masonry structures. In this study, we discuss complex structure include vault and rib cover with two radii and actual dimensions under a vertical load. The unreinforced structure data were compared with analysis data. The analysis data are in good agreement with experimental data. In the first experiment, a structure without reinforcement is tested and according to the test results, the second structure was reinforced using the carbon polymer fibers and the same test is done to see the effects of reinforcement. Based on the test results of the first structure, the first cracks are created in the vault. Moreover, the reinforcement with carbon fibers will increase the loading capacity of the structure around 35%.

Free vibration analysis of functionally graded cylindrical shells with different shell theories using semi-analytical method

Majid Khayat,Seyed Mehdi Dehghan,Mohammad Amir Najafgholipour,Abdolhossein Baghlani 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.28 No.6

In this study, the semi-analytical finite strip method is adopted to examine the free vibration of cylindrical shells made up of functionally graded material. The properties of functionally graded shells are assumed to be temperature-dependent and vary continuously in the thickness direction according to a simple power law distribution in terms of the volume fraction of ceramic and metal. The material properties of the shells and stiffeners are assumed to be continuously graded in the thickness direction. Theoretical formulations based on the smeared stiffeners technique and the classical shell theory with first-order shear deformation theory which accounts for through thickness shear flexibility are employed. The finite strip method is applied to five different shell theories, namely, Donnell, Reissner, Sanders, Novozhilov, and Teng. The approximate procedure is compared favorably with three-dimensional finite elements. Finally, a detailed numerical study is carried out to bring out the effects of power-law index of the functional graded material, stiffeners, and geometry of the shells on the difference between various shell theories. Finally, the importance of choosing the shell theory in simulating the functionally graded cylindrical shells is addressed.

Synthesis, recognition and evaluation of molecularly imprinted polymer nanoparticle using miniemulsion polymerization for controlled release and analysis of risperidone in human plasma samples

Majid Abdouss,Ebadullah Asadi,Saman Azodi-Deilami,Davood Kordestani,Alireza Rahimi,Somayeh Asadi 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6

We prepared high selective imprinted nanoparticle polymers by a miniemulsion polymerization technique,using risperidone as the template, MAA as the functional monomers, and TRIM as the cross-linker in acetonitrileas solvent. The morphology of the nanoparticles determined by scanning electron microscopy (SEM) images and drugrelease, binding properties and dynamic light scattering (DLS) of molecularly imprinted polymers (MIPs) were studied. Controlled release of risperidone from nanoparticles was investigated through in 1% wt sodium dodecyl sulfate aqueoussolution and by measuring the absorbance by HPLC-UV. The results showed that the imprinted nanoparticles exhibiteda higher binding level and slower release rate than non-imprinted nanoparticles, which contributed to interaction ofrisperidone with imprinted cavities within nanoparticles. Furthermore, the results from HPLC showed good precision(5% for 50.0 g L-1) and recoveries (between 86-91) using MIP from human plasma samples.

Preparation of noble metal nanocatalysts and their applications in catalytic partial oxidation of methane

Majid Khajenoori,Mehran Rezaei,Behzad Nematollahi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3

A series of noble metal catalysts (Ru, Rh, Ir, Pt, and Pd) supported on alumina-stabilized magnesia were prepared and employed in partial oxidation of methane. The prepared catalysts were characterized using BET, SEM, TEM and H2S chemisorption techniques. The results revealed that the Ru and Rh catalysts had the highest activity in catalytic partial oxidation of methane. Based on the obtained results the following order of activity was observed for different catalysts in partial oxidation of methane:Rh ~ Ru > Ir > Pt > Pd. The obtained results also showed a high catalytic stability without any decrease in methane conversion up to 50 h of reaction.

Estimation of minimum horizontal stress, geomechanical modeling and hybrid neural network based on conventional well logging data – a case study

Majid Jamshidian,Mostafa Mansouri Zadeh,Mohsen Hadian,Sahand Nekoeian,Morteza Mansouri Zadeh 한국자원공학회 2017 Geosystem engineering Vol.20 No.2

The minimum horizontal stress (Shmin) is one of the three principal stresses and is required for evaluation of the hydraulic fracturing, sand production, and well stability. Shmin is obtained using direct methods such as the leak-off and mini-frac tests or using some equations like the poroelastic equation. These equations require some information including the elastic parameters, shear sonic logs, core data and the pore pressure. In this study, a geomechanical model is constructed to obtain the minimum horizontal stress; then, an artificial neural network (ANN) with multilayer perceptron and feedforward backpropagation algorithm based on the conventional well logging data is applied to predict the Shmin. Cuckoo optimization algorithm (COA), imperialist competitive algorithm, particle swarm optimization and genetic algorithm are also utilized to optimize the ANN. The proposed methodology is applied in two wells in the reservoir rock located at the southwest of Iran, one for training, and the other one for testing purposes. It is found that the performance of the COA–ANN is better than the other methods. Finally, Shmin values can be estimated by the conventional well logging data without having the required parameters of the poroelastic equation.

Comparative Study of Poly(L-Lactic Acid) Scaffolds Coated with Chitosan Nanoparticles Prepared via Ultrasonication and Ionic Gelation Techniques

Majid Salehi,Mahdi Naseri-Nosar,Mahmoud Azami,Saeedeh Jafari Nodooshan,Javad Arish 한국조직공학과 재생의학회 2016 조직공학과 재생의학 Vol.13 No.5

In this study, an attempt was made to develop bi-functional constructs serving both as scaffolds and potential delivery systems for application in neural tissue engineering. The constructs were prepared in two steps. In the first step, the bulks of poly (L-lactic acid) (PLLA) in 1, 4-dioxane/water (87:13) were fabricated using liquid-liquid thermally induced phase separation technique. In the next step, the prepared bulks were coated with chitosan nanoparticles produced by two different techniques of ultrasonication and ionic gelation by grafting-coating technique. In ultrasonication technique, the chitosan solution (2 mg/mL) in acetic acid/sodium acetate buffer (90:10) was irradiated by an ultrasound generator at 20 kHz and power output of 750 W for 100 s. In ionic gelation technique, the tripolyphosphate in water solution (1 mg/mL) was added to the same chitosan solution. The physicochemical properties of the products were characterized by Scanning Electron Microscopy, Attenuated Total Reflection Fourier Transform-Infrared, liquid displacement technique, contact angle measurement, compressive and tensile tests, as well as zeta potential and particle size analysis using dynamic light scattering. Moreover, the cell proliferation and attachment on the scaffolds were evaluated through human glioblastoma cell line (U-87 MG) and human neuroblastoma cell line [BE (2)-C] culture respectively. The results showed that the samples coated with chitosan nanoparticles prepared by ultrasonication possessed enhanced hydrophilicity, biodegradation and cytocompatibility compared with pure PLLA and PLLA coated with chitosan nanoparticles prepared by ionic gelation. This study suggests successful nanoparticles-scaffold systems which can act simultaneously as potential delivery systems and tissue engineering scaffolds.

Electrospun Poly(ε-caprolactone)/Gelatin Nanofibrous Mat Containing Selenium as a Potential Wound Dressing Material: In Vitro and In Vivo Study

Majid Salehi,Keyvan Shahporzadeh,Arian Ehterami,Hodays Yeganehfard,Heliya Ziaei,Mohammad Moein Azizi,Saeed Farzamfar,Amirreza Tahersoltani,Arash Goodarzi,Jafar Ai,Akbar Ahmadi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.8

In the current study, selenium particles were loaded into poly(ε-caprolactone)/gelatin nanofibrous matrices in orderto fabricate a potential wound dressing. The mats were produced by electrospinning of poly(ε-caprolactone)/Gelatin (1:1(w/w)) solution supplemented with 1 and 10 % (w/v) of selenium particles. Prepared wound dressings were investigatedregarding their morphology, mechanical properties, surface wettability, water-uptake capacity, water vapor permeability,porosity, blood compatibility, microbial penetration test and cellular response. Dressings containing 1 % and 10 % seleniumand selenium free mats were chosen to treat the full-thickness excisional wounds in Wistar rats. The study revealed that after14 days, the wound closure of the mat containing 1 % selenium was about 95.5±6.38 % while wound closure of the negativecontrol group was about 48.83±4.03 %. Our results showed the capability of nanofibrous containing selenium for successfulwound treatment.