Context-Aware Middleware Architecture for Smart Home Environment

Hamed Vahdat-Nejad,Kamran Zamanifar,Nasser Nematbakhsh 보안공학연구지원센터 2013 International Journal of Smart Home Vol.7 No.1

Effect of Reconfiguration and Capacitor Placement on Power Loss Reduction and Voltage Profile Improvement

Hamed Hosseinnia,Murteza Farsadi 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.6

Reconfiguration is an important method to minimize power loss and load interruption by creating an optimal configurationof a system. Furthermore, by increasing demand and value of consumption, construction of new power plants can bepostponed in networks by reconfiguration and proper arrangement of linkage switches. This method is feasible for radialnetworks, which create meshes of linkage switches. One convenient way to achieve a system with minimal power loss andinterruption is to utilize capacitors. Optimal placement and sizing of capacitors in such applications is an important issue inthe literature. In this paper, cat swarm optimization is introduced as a new metaheuristic algorithm to achieve this purpose. Simulation has been carried out in two feasible networks, 69-bus and 33-bus systems.

Automated Tool for Predicting Duration of Construction Activities in Tropical Countries

Hamed Golizadeh,Aidin Nobahar Sadeghifam,Hamid Aadal,Muhd Zaimi Abd Majid 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.1

Proper and accurate estimating of construction activities’ duration is a key factor, as it can cause the success or failure of a project. The common methods of duration estimating have shown some inaccuracies according to previous studies. This study aims to develop a tool for estimating the duration of construction’s major activities regarding to the structural elements of concrete frame buildings. This tool is appropriate for tropical regions. In order to reach this purpose, Artificial Neural Network (ANN) is employed as the core calculating engine of the tool. Through literature survey and experts interviewing, the factors which can critically influence the activity duration have been identified. By means of the collected data from actual cases, four ANN models have been trained and tested for estimating the duration of installing column reinforcements, installing beam reinforcements, column concreting and beam concreting activities. Finally, a web-based program was designed and tested as an automated tool for suiting engineers to estimate the duration of scoped activities based on ANN method. Engineers and decision makers in the tropical regions can utilize the developed tool in the planning phase of their projects to produce more accurate estimations of activity durations.

An analytical guidance law of planetary landing mission by minimizing the control effort expenditure

Hamed Hossein Afshari,Alireza Basohbat Novinzadeh,Jafar Roshanian 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.12

An optimal trajectory design of a module for the planetary landing problem is achieved by minimizing the control effort expenditure. Using the calculus of variations theorem, the control variable is expressed as a function of costate variables, and the problem is converted into a two-point boundary-value problem. To solve this problem, the performance measure is approximated by employing a trigonometric series and subsequently, the optimal control and state trajectories are determined. To validate the accuracy of the proposed solution, a numerical method of the steepest descent is utilized. The main objective of this paper is to present a novel analytic guidance law of the planetary landing mission by optimizing the control effort expenditure. Finally, an example of a lunar landing mission is demonstrated to examine the results of this solution in practical situations.

Hysteretic performance of SPSWs with trapezoidally horizontal corrugated web-plates

Hamed Kalali,Tadeh Zirakian,Mohammad Hajsadeghi,Farshid J. Alaee 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.19 No.2

Previous research has shown that steel plate shear walls (SPSWs) are efficient lateral force-resisting systems against both wind and seismic loads. A properly designed SPSW can have high initial stiffness, strength, and energy absorption capacity as well as superior ductility. SPSWs have been commonly designed with unstiffened and stiffened infill plates based on economical and performance considerations. Recent introduction and application of corrugated plates with advantageous structural features has motivated the researchers to consider the employment of such elements in stiffened SPSWs with the aim of lowering the high construction cost of such high-performing systems. On this basis, this paper presents results from a numerical investigation of the hysteretic performance of SPSWs with trapezoidally corrugated infill plates. Finite element cyclic analyses are conducted on a series of flat- and corrugated-web SPSWs to examine the effects of web-plate thickness, corrugation angle, and number of corrugation half-waves on the hysteretic performance of such structural systems. Results of the parametric studies are indicative of effectiveness of increasing of the three aforementioned web-plate geometrical and corrugation parameters in improving the cyclic response and energy absorption capacity of SPSWs with trapezoidally corrugated infill plates. Increasing of the web-plate thickness and number of corrugation half-waves are found to be the most and the least effective in adjusting the hysteretic performance of such promising lateral force-resisting systems, respectively. Findings of this study also show that optimal selection of the web-plate thickness, corrugation angle, and number of corrugation half-waves along with proper design of the boundary frame members can result in high stiffness, strength, and cyclic performances of such corrugated-web SPSWs.

Synthesis and characterization of polyaniline/γ-alumina nanocomposite: A comparative study for the adsorption of three different anionic dyes

Hamed Reza Javadian,Mahmood Torabi Angaji,M. Naushad 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

In this study, polyaniline/g-alumina nanocomposite was synthesized by chemical oxidation method and characterized by field emission scanning electron microscopy, transmission electron microscopy, Fourier transform-infrared spectrometer, X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, and Brunauer–Emmett–Teller method. Batch adsorption experiments were conducted for removing three types of hazardous dyes Reactive Red 194, Acid Blue 62 and Direct Blue 199 from aqueous solution and the effect of pH, adsorbent dosage, contact time, and initial concentration of dyes were investigated. Meanwhile, kinetic, isotherm, and thermodynamic parameters were also determined.

Investigation of a nonlinear dynamic hydraulic system model through the energy analysis approach†

Hamed Hossein Afshari,Mostafa Ehramianpour,Morteza Mohammadi 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.11

The dynamics of a pressure regulator valve have been studied using the through Bondgraph simulation technique. This valve consists of several elements that can transmit, transform, store, and consume hydraulic energy. The governing equations of the system have been derived from the dynamic model. In solving system equations numerically, various pressure-flow characteristics across the regulator ports and orifices have been taken into consideration. This simulation study identifies some critical parameters that have significant effects on the transient response of the system. The results have been obtained using the MATLAB-SIMULINK environment. The main advantage of the proposed methodology is its ability to model the nonlinear behavior of the hydraulic resistance of system elements as a function of the fluid flow rate.

HII REGIONS IN THE SPIRAL GALAXY NGC 3389

HAMED ABDEL-HAMID,LEE SANG-GAK,NOTNI PETER The Korean Astronomical Society 2003 Journal of The Korean Astronomical Society Vol.36 No.2

CCD observations in V, I and H$\alpha$ for NGC 3389 are used to present photometry of 61 HII regions. Their positions, diameters and absolute luminosities have been determined. The luminosity and size distribution functions of the HII regions in NGC 3389 are discussed.

Effect of varying amounts of linseed oil or saturated fatty acids around insemination on reproductive and blood parameters of ewes

Hamed Esmaili,Mohsen Eslami,Hamed Khalilvandi-Behrozyar,Farhad Farrokhi-Ardabili 한국축산학회 2023 한국축산학회지 Vol.65 No.5

The current study was designed to evaluate the effect of sequential low and high dietary linseed oil (LO; as omega-3 enriched fatty acid; FA) before and post insemination, respectively, on different plasma variables of ewes. Fat-tailed Qezel ewes were assigned randomly to be fed a diet enriched with 3% LO (n = 30) or the saturated FA (SFA; n = 30) three weeks before insemination (Day 0). The lipogenic diet supplemented with 6% LO or SFA was fed after insemination until Day +21. The control ewes were fed an isocaloric and isonitrogenous diet with no additional FA during the study. Estrus was synchronized by inserting a vaginal sponge (Spongavet®) for 12 days + 500 IU equine chorionic gonadotropin (eCG; Gonaser®), and ewes were inseminated via laparoscopic approach 56–59 h after eCG injection. The size of ovarian structures was assessed by transvaginal ultrasonography at −21, −14, −2, 0, and +10 days. Blood samples were collected weekly to measure the plasma’s different biochemical variables and FA profile. Treatment did not affect the amounts of glucose, aspartate aminotransferase, alanine aminotransferase, lactate dehydrogenase, interleukin-10, interleukin-2, and non-esterified FA (p > 0.05). Conversely, concentrations of triglyceride, cholesterol, tumor necrosis factor-alpha, and insulin-like growth factor-1 were higher in SFA-fed ewes relative to control animals (p < 0.05). LO feeding resulted in greater amounts of n-3 FA isomers in plasma, while higher amounts of stearic acid were detected in SFA fed group 0 and +21 (p < 0.05). The number of ovarian follicles and corpora lutea also were not affected by treatment. Other reproductive variables were not affected by treatment except for the reproductive rate. It seems that LO or SFA feeding of fat-tailed ewes peri-insemination period was not superior to the isocaloric non-additional fat diet provided for the control group during the non-breeding season.

Soil Infiltration Characteristics in Alternate and Conventional Furrow Irrigation using Different Estimation Methods

Hamed Ebrahimian 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6

Field data sets for seven irrigation events during maize growing season were collected for characterizing infiltration properties invariable Alternate, Fixed Alternate and Conventional Furrow Irrigation (AFI, FFI and CFI, respectively). Three various estimationmethods; the two-point method and the INFILT and IPARM models; were used to estimate the infiltration parameters of the modifiedKostiakov equation for alternate and conventional furrows and then compared with field results. Less runoff losses and largerinfiltration were observed in alternate furrows as compared to conventional furrows due to increased lateral water movement to nonirrigatedfurrow. AFI had somewhat greater infiltration rate than FFI. The steady infiltration rate in AFI and FFI was higher than inCFI. The IPARM model had the most accurate and reliable performance relative to others in three irrigation treatments. However thetwo-point method also performed well. The INFILT model was not suitable on the experimental field studied and highlyoverestimated the infiltration for all irrigation treatments. The results indicated that measuring both advance and runoff data isnecessary to achieve reasonable and precise infiltration parameters. Having different infiltration characteristics in alternate furrows,design variables of alternate furrow irrigation will be different from conventional furrow irrigation in the same field.